CN1257776A - Method for producing anticorrosion and flame-retarding composite material of wood and high polymer with excellent mechanical properties and its products - Google Patents
Method for producing anticorrosion and flame-retarding composite material of wood and high polymer with excellent mechanical properties and its products Download PDFInfo
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Abstract
An anticorrosion flame-retarding composite material with high mechanical properties is prepared from poor-quality wood and polymer through impregnating the wood in the polymer solution with concentration of 30-90% Kg/l (or 5-3% Kg/L for multifunctional monomer) at 20-50 deg.C for 12-48 hrs. and radiating under 40-300 Kgy. Water or methanol is used as the solvent of polymer solution. Its advantages are easily controlled process, less consumption of solvent and energy and no secondary pollution.
Description
The invention relates to modification of poor-quality fast-growing wood, in particular to a method for producing a wood high polymer composite material with corrosion resistance, flame retardance and excellent mechanical properties by polymerizing a polymer monomer in wood after the polymer monomer is used for impregnating the poor-quality wood and a product thereof.
At present, wood products on the market are made of round wood through cutting, so that a great amount of forest resources are consumed every year, forests are protected, and forest industry development becomes a problem of great concern for all countries in the world. Generally, the forest coverage rate is requiredto be not lower than 1/3 of the territorial area of China, but the situation of China is severe, the forest coverage rate is only 12.9 percent of the territorial area of China, the forest coverage rate is 32.3 percent of the territorial area of China on average, and the territorial area of China is 120 th in 160 countries and regions in the world. The forest area in China is 1.25 hectares, the 6 th place in the world is occupied, and the area of the forest land is only 0.11 hectares according to the average population. As for the wood accumulation amount of about 95.23 hundred million m3, everyone is the lowest in the world and is 1/8 of the world's per capita level, from these simple estimation figures, it is known that the wood resources in China are correspondingly extremely poor. Wood is widely used as an important production material and life material in economic construction and civil life. According to incomplete statistics, the annual consumption of wood in China is more than one hundred million cubic meters, the furniture industry needs hard wood about 300 million cubic meters every year, and about 5 percent of high-quality wood needs to be imported from foreign countries, for example, 415 million cubic meters of log is imported in 1990. Although wood belongs to a primary resource, the regeneration period of the wood is longer, particularly high-quality wood often needs a timber production period of dozens of years or even hundreds of years, and the timber production period is shorter and often is inferior wood. Therefore, wood is currently in a shortage in the world. In particular, high-quality wood such as rosewood and willow is highly preferred because of its excellent performance, and its stock is limited, so that it is expensive and its price is increasing year by year.
The available mature forest and over mature forest have only 14-15 billion cubic meters as most resources for cutting, and the cutting amount which is only enough for seven or eight years in the future is calculated according to the annual consumption level of the current timberland. Especially, the occurrence of huge flood in hundreds of years of long trip in Yangtze river in China recently and the loss of water and soil caused by large amount of felling.
Because natural wood can not meet market demands, at present, a considerable part of wood products are artificial boards such as plywood and shaving boards made of cut wood leftover materials through bonding and extrusion, and the defects of low mechanical property, poor wear resistance, poor corrosion resistance and the like exist.
In addition, Chinese patent application No. 96121219.5 discloses a wood-plastic composite material and its manufacturing method, wherein the wood-plastic composite material is prepared by immersing plastic monomer in the gaps of wood, and inducing the plastic monomer and wood gaps to form a net-shaped cross-linked structure by radiation, the manufacturing method comprises drying the wood of the object to be immersed, placing in an immersion tank, reducing pressure with a vacuum pump to 0.08MPa, and injecting to make the volume weight of the wood reach 1-1.2g/cm3Then, the wood is packed and sealed by aluminum foil composite tape, and moved into an irradiation chamber and then C is used0 60The source is irradiated with 100-200KGY and polished. The technical disclosure of this application is difficult to implement, the impregnation of the wood is carried out with plastic monomers only, which are impermeable in the absence of solventsEven impregnation into the wood material is not possible or the impregnation amount is not as high as it should. And no other auxiliary agents are added, such as: under the conditions of the multifunctional monomer, the preservative and the flame retardant, the wood-plastic material has no mechanical property, and the flame retardant property and the corrosion resistance are poor.
The purpose of the invention is as follows:
the invention aims to overcome the defects of low mechanical property, poor wear resistance and poor corrosion resistance of the artificial board produced by the prior art, and aims to utilize inferior wood or inferior wood and high polymer to compound and produce the wood high polymer composite material which has corrosion resistance, flame retardance and various properties reaching or exceeding those of high-quality wood, can be processed conveniently at a cost lower than that of high-quality wood, thereby providing a method which has no pollution to the environment and can industrially produce the wood high polymer composite material with excellent corrosion resistance, flame retardance and good and practical mechanical properties.
The purpose of the invention is realized as follows: the method for preparing the wood high polymer composite material with corrosion resistance, flame retardance and excellent mechanical properties by taking inferior wood as a raw material and soaking the inferior wood in multi-component soaking liquid and initiating polymerization through radiation, provided by the invention, the multifunctional monomer in the soaking liquid can play a role in crosslinking and strengthening crosslinking, so that the mechanical properties of the wood high polymer composite material are greatly improved;
the invention provides a method for producing a wood high polymer composite material with corrosion resistance, flame retardance and excellent mechanical properties, which comprises the steps of cleaning raw materials, carrying out a drying process for removing water, and then putting the raw materials into an impregnation liquid for impregnation, and is characterized in that: the impregnation liquid comprises:
(1) water and methanol are used as solvents;
(2) the solute comprises acrylamide, methyl, ethyl or butyl (meth) acrylate, styrene, acrylonitrile, N-vinyl pyrrolidone, trimethylethylene glycol diacrylate, trimethylolpropane triacrylate, glycidyl acrylate, hexanediol diacrylate, methylene bisacrylamide; the concentration of the multifunctional monomer in the impregnation liquid is 0.5-3%. The concentration of the basic monomer of the impregnating solution is 30-90%. The impregnation liquid also comprises lithium nitrate and copper nitrate preservatives, and the concentration of the preservatives is 0.5-3%. The dipping solution also comprises a nitrogenated paraffin oil flame retardant, the concentration of which is 5% -40%, and the concentration unit is expressed by K/L. The impregnation process comprises the following steps:
1. putting the wood to be treated into a vacuum drier, and vacuum-drying for 12-48 hours under the conditions of 1-50mmHg and 50-90 ℃ so as to reduce the water content of the wood, ensure that the interior of the raw material has more gaps, and ensure that the impregnation liquid is easily and uniformly impregnated in the interior of the material;
2. quickly putting the dried wood into an impregnator for impregnation, keeping the reduced pressure at 1-10mmHg at normal temperature for 0.5-5 hours, injecting an impregnation solution in a nitrogen atmosphere, finally impregnating at 20-50 ℃ for 12-48 hours under the normal pressure or 1-3 atmospheric pressure in the impregnator, taking out the wood, and wiping the wood with absorbent paper for later use;
3. the impregnated wood is uniformly irradiated with electron beams under the protection of nitrogen, the irradiation dose is in the range of 40-300Kgy, and the surfaces of the wood are overturned during the irradiation process so as to be uniformly irradiated. The flow rate of nitrogen protection is the generalprotection:
the wood high polymer composite material with corrosion resistance, flame retardance and excellent mechanical property is produced and applied in the following aspects: outdoor building materials and floor materials, and is suitable for occasions with high crowd density, such as dance halls, gymnasiums, exhibition halls, department stores, classrooms and machine rooms, furniture and various wooden products. The special purpose is as follows: laboratory experiment tables, chairs, medicine racks and cabinets for experiments are corrosion-resistant, smooth, hard and resistant to various pollutions. Chemical plant dunnage, fences, etc. may also be used. The deck plate or cover of the marine ship can resist the erosion of seawater and long-term scouring. The gun stock, the bow arm and various artworks are anti-cracking, mothproof and non-deforming, and can be stored permanently.
THE ADVANTAGES OF THE PRESENT INVENTION
1. The method for producing the wood high polymer composite material with corrosion resistance, flame retardance and excellent mechanical property opens up a new way for producing high-quality wood, and can meet the market demand;
2. the method of the invention applies the radiation process, has convenient operation, easy control of the process flow, good safety performance, capability of carrying out reaction at normal temperature, low energy consumption, low solvent consumption, no secondary pollution and contribution to environmental protection.
3. The specific gravity of the wood high polymer composite material with excellent production corrosion resistance, flame retardance and mechanical property provided by the invention is 0.5-0.9g/cm3. The high-hardness wear-resistant flame-retardant polyurethane foam material has the excellent performances of high hardness, wear resistance, high compressive strength, high bending resistance, low water absorption, good dimensional stability, chemical corrosion resistance, flame retardance, attractive appearance and the like. And extend the use of wood and extend their useful life.
The invention will be further illustrated with reference to the following examples and the accompanying drawings,
FIG. 1 is a photomicrograph of normal poplar.
Figure 2 is a photomicrograph of a product (WPC) made from ordinary poplar by the process of the invention.
FIG. 3 is the relationship between the density of common poplar and the irradiation dose.
FIG. 4 is the multifunctional monomer addition versus product density for example 11.
FIG. 5 is a graph of the multifunctional monomer addition versus product hardness for example 11.
Figure 6 is monomer versus WPC product density.
Description of the drawings: (1) the preparation method comprises the following steps of (1) preparing a base monomer acrylamide aqueous solution, (2) preparing an acrylamide and NVP aqueous solution, (3) preparing an acrylamide and NPV and U aqueous solution, (4) preparing an acrylamide and NVP and U and Bi aqueous solution, (5) preparing common poplar wood, and (6) preparing fraxinus mandshurica. WPC represents the product of the invention.
Example 1
Using Daxing poplar wood as raw material, dissolving 50Kg of acrylamide basic monomer in 100L of methanol to obtain a soaking solution with a concentration of 50%; with 11% vinylpyrrolidone, 1% urea, 1% methylenebisacrylamide, 50-70% styrene, vinylpyrrolidone, 1% urea,the solvents both methanol and water can be prepared, the concentration units are expressed in K/L.
The method comprises the following specific steps: firstly, putting a poplar sample into a vacuum dryer, carrying out vacuum drying for 24 hours at 70 ℃ under the condition of 5mmHg so as to reduce the water content of the wood and ensure that more gaps are formed in the wood and the wood is convenient to soak, then putting the poplar sample into a impregnator, keeping the vacuum degree of 5mmHg at normal temperature for soaking for 1 hour, injecting a soaking solution into the impregnator under the nitrogen atmosphere with the flow rate as the nitrogen atmosphere, finally soaking for 48 hours at normal pressure and normal temperature in the impregnator, wiping the poplar sample with filter paper, uniformly irradiating under the protection of nitrogen with the irradiation dose of 80Kgg, and finally polishing to obtain a finished product.
According to national standards GB1931-80, GB1932-80, GB1933-80, GB1934-80, GB1935-80, GB1936-80, GB1937-80, GB1938-80, GB1939-80, GB1941-80, GB2406-80 and GB/T139421-92, the density, the water content, the dry shrinkage, the water absorption, the tensile strength, the shear strength, the bending strength, the elastic modulus, the compressive strength, the hardness, the flame retardant property, the wear resistance and the like of the material of the invention are measured to reach or exceed the standards, and the data are shown in the following tables 1-7.
Table 1 wood grain-following compressive strength record table tree species: the production area of the poplar: great room temperature: 22 ℃ laboratory relative humidity: 60% of the test piece has a water content of 7.2%
| Test specimen Numbering | Sample size (mm) | Area under pressure (mm2) | Maximum load (N) | Compressive strength along grain (MPa) | Remarks for note | ||
| Width of | Thickness of | At the time of testing* | The water content is 12% | ||||
| 1 | 20.8 | 21.0 | 436.8 | 37000 | 84.7 | 64.4 | |
| 2 | 20.0 | 21.0 | 420.0 | 33700 | 80.2 | 61.0 | |
| 3 | 20.4 | 20.4 | 416.2 | 27000 | 64.9 | 49.3 | |
| 4 | 20.0 | 20.3 | 406.0 | 37700 | 92.9 | 70.6 | |
| 5 | 20.3 | 20.7 | 420.2 | 30000 | 71.4 | 54.3 | |
| 6 | 20.3 | 20.6 | 418.2 | 38000 | 90.9 | 69.1 | |
| 7 | 20.2 | 20.6 | 416.1 | 27900 | 67.0 | 50.9 | |
| 8 | 20.3 | 20.6 | 418.2 | 22500 | 53.8 | 40.9 | |
| 9 | 20.3 | 21.2 | 430.4 | 39000 | 90.6 | 68.9 | |
| 10 | 20.3 | 20.9 | 424.3 | 39000 | 91.9 | 69.8 | |
| 11 | 20.1 | 20.6 | 414.1 | 24200 | 58.4 | 44.4 | |
| 12 | 19.9 | 20.3 | 404.0 | 26000 | 64.4 | 48.9 | |
| 13 | 19.9 | 21.0 | 417.9 | 35000 | 83.8 | 63.7 | |
| 14 | 20.5 | 20.4 | 418.2 | 33500 | 80.1 | 60.9 | |
| 15 | 20.1 | 20.6 | 414.1 | 33500 | 80.9 | 61.5 | |
| 16 | 20.1 | 20.7 | 416.1 | 38800 | 93.3 | 70.9 | |
| 17 | 20.1 | 20.8 | 418.1 | 32300 | 77.3 | 58.7 | |
| 18 | 20.1 | 19.9 | 399.9 | 39000 | 97.5 | 74.1 | |
| 19 | 20.8 | 21.7 | 451.3 | 39000 | 86.4 | 65.7 | |
| 20 | 20.6 | 21.9 | 451.1 | 39000 | 86.4 | 65.7 | |
| 21 | 20.5 | 20.6 | 422.3 | 28500 | 67.5 | 51.3 | |
| 22 | 20.7 | 21.0 | 434.7 | 19400 | 44.6 | 33.9 | |
| 23 | 20.5 | 20.7 | 424.4 | 30000 | 70.7 | 53.7 | |
| 24 | 20.4 | 21.0 | 428.4 | 30500 | 71.2 | 54.1 | |
| 25 | 20.5 | 21.2 | 434.6 | 25700 | 59.1 | 44.9 | |
| 26 | 20.5 | 21.2 | 434.6 | 32700 | 75.2 | 57.2 | |
| 27 | 20.8 | 21.2 | 441.0 | 28500 | 64.6 | 49.1 | |
| 28 | 20.8 | 21.0 | 436.8 | 39000 | 89.3 | 67.9 | |
| 29 | 19.8 | 20.7 | 409.9 | 27500 | 67.1 | 51.0 | |
| 30 | 19.8 | 21.4 | 423.7 | 25100 | 59.2 | 45.0 | |
| * X＝75.5 S＝13.5 Sr＝±2.46 V＝17.8％ P＝6.5％ | |||||||
Table 2 the wood grain shear strength test records table tree species: the production area of the poplar: great room temperature: 22 ℃ laboratory relative humidity: 60% of the test piece has a water content of 7.2%
| Test specimen Numbering | Sample size (mm) | Shear area (mm2) | Maximum load (N) | Chord plane shear strength (MPa) | Remarks for note | |||
| Width of | Thickness of | Chord surface | Radial surface | At the time of testing* | The water content is 12% | |||
| 1 | 20.1 | 20.5 | 412.1 | 6500 | 15.8 | 13.5 | ||
| 2 | 20.5 | 21.6 | 422.3 | 9000 | 21.3 | 18.2 | ||
| 3 | 20.8 | 21.0 | 436.5 | 6700 | 15.3 | 13.1 | ||
| 4 | 20.8 | 20.6 | 428.5 | 6900 | 16.1 | 13.8 | ||
| 5 | 20.9 | 21.2 | 443.1 | 6600 | 14.9 | 12.8 | ||
| 6 | 20.7 | 20.9 | 432.6 | 5400 | 12.5 | 10.7 | ||
| 7 | 21.2 | 20.8 | 441.0 | 6600 | 15.0 | 12.8 | ||
| 8 | 21.1 | 21.1 | 445.2 | 7100 | 15.9 | 10.7 | ||
| 9 | 20.8 | 21.0 | 436.8 | 5600 | 12.8 | 12.8 | ||
| 10 | 20.7 | 21.4 | 443.0 | 8600 | 19.4 | 13.6 | ||
| 11 | 20.8 | 21.5 | 447.2 | 5700 | 12.7 | 11.0 | ||
| 12 | 20.8 | 21.3 | 443.0 | 5200 | 11.7 | 16.6 | ||
| 13 | 20.7 | 20.9 | 432.6 | 5200 | 12.0 | 10.9 | ||
| 14 | 19.7 | 20.7 | 407.8 | 5500 | 13.5 | 10.0 | ||
| 15 | 19.8 | 19.9 | 394.0 | 5200 | 13.2 | 10.3 | ||
| 16 | 20.4 | 20.9 | 426.4 | 5700 | 13.4 | 11.6 | ||
| 17 | 20.0 | 20.0 | 400.0 | 6200 | 15.5 | 11.3 | ||
| 18 | 19.7 | 20.1 | 396.0 | 4900 | 12.4 | 11.5 | ||
| 19 | 20.3 | 21.5 | 436.4 | 6000 | 13.7 | 13.3 | ||
| 20 | 20.0 | 20.3 | 406.0 | 5700 | 14.0 | 10.6 | ||
| 21 | 20.1 | 20.7 | 416.1 | 5000 | 12.0 | 11.7 | ||
| 22 | 21.0 | 21.1 | 443.1 | 5000 | 11.3 | 9.7 | ||
| 23 | 21.2 | 21.3 | 451.6 | 5800 | 12.8 | 11.0 | ||
| 24 | 20.9 | 21.5 | 449.4 | 5300 | 11.8 | 10.1 | ||
| 25 | 21.4 | 22.0 | 470.8 | 5200 | 11.0 | 9.41 | ||
| 26 | 21.4 | 21.6 | 462.2 | 5600 | 12.1 | 10.4 | ||
| 27 | 21.3 | 21.5 | 458.0 | 6200 | 13.5 | 11.6 | ||
| 28 | 20.4 | 20.9 | 426.4 | 5500 | 12.9 | 11.0 | ||
| 29 | 20.6 | 20.9 | 430.5 | 5300 | 12.3 | 10.5 | ||
| 30 | 21.4 | 21.4 | 458.0 | 5500 | 12.0 | 10.3 | ||
| * X＝13.8 S＝2.3 Sr＝±0.42 V＝16.7％ P＝6％ | ||||||||
Table 3 wood hardness test records table tree species: the production area of the poplar: great room temperature: 22 ℃ laboratory relative humidity: 60% of the test piece has a water content of 7.2%
| Test specimen Numbering | Front side | End face | Remarks for note | ||
| At the time of testing* | The water content is 12% | At the time of testing** | The water content is 12% | ||
| 1 | 73.2 | 62.7 | 131.2 | 112.3 | |
| 2 | 71.7 | 61.4 | 77.0 | 65.9 | |
| 3 | 55.9 | 47.9 | 82.6 | 70.7 | |
| 4 | 52.0 | 44.5 | 100.5 | 86.0 | |
| 5 | 63.2 | 54.1 | 101.1 | 86.5 | |
| 6 | 52.8 | 45.2 | 67.6 | 57.9 | |
| 7 | 44.5 | 38.1 | 74.8 | 64.0 | |
| 8 | 48.8 | 41.8 | 69.4 | 59.4 | |
| 9 | 47.3 | 40.5 | 86.6 | 74.1 | |
| 10 | 65.7 | 56.2 | 115.2 | 98.6 | |
| 11 | 43.4 | 37.2 | 90.1 | 77.1 | |
| 12 | 52.5 | 44.9 | 99.5 | 85.2 | |
| 13 | 77.6 | 66.4 | 103.0 | 88.2 | |
| 14 | 62.4 | 53.4 | 76.6 | 65.6 | |
| 15 | 65.0 | 55.6 | 69.8 | 59.7 | |
| 16 | 57.5 | 49.2 | 101.7 | 87.1 | |
| 17 | 67.7 | 58.0 | 97.2 | 83.2 | |
| 18 | 72.4 | 62.0 | 90.4 | 77.4 | |
| 19 | 66.7 | 57.1 | 99.4 | 85.1 | |
| 20 | 69.4 | 59.4 | 90.6 | 77.6 | |
| 21 | 57.3 | 49.0 | 76.4 | 65.4 | |
| 22 | 44.5 | 38.1 | 84.1 | 72.0 | |
| 23 | 51.2 | 43.8 | 82.8 | 70.9 | |
| 24 | 52.2 | 44.7 | 72.6 | 62.1 | |
| 25 | 57.6 | 49.3 | 72.8 | 62.3 | |
| 26 | 44.4 | 38.0 | 69.1 | 59.1 | |
| 27 | 70.7 | 60.5 | 98.2 | 84.1 | |
| 28 | 43.5 | 37.2 | 71.7 | 61.4 | |
| 29 | 54.5 | 46.7 | 66.6 | 57.0 | |
| 30 | 56.9 | 48.7 | 67.8 | 58.0 | |
| * X＝58.1 S＝10.1 Sr＝±1.85 V＝17.4％ P＝6％ ** X＝86.2 S＝16.0 Sr＝±2.92 V＝18.6％ P＝6.7％ | |||||
Table 4 cross grain compressive strength test records table tree species: the production area of the poplar: great room temperature: 22 ℃ laboratory relative humidity: 60% of the test piece has a water content of 7.2%
| Test specimen Numbering | Sample size (mm) | Area under pressure (mm2) | Proportional ultimate load (N) | Compressive strength (MPa) | Remarks for note | ||
| Width of | Thickness of | At the time of testing* | The water content is 12% | ||||
| 1 | 20.4 | 20.3 | 414.1 | 4200 | 10.1 | 7.9 | |
| 2 | 21.0 | 20.5 | 430.5 | 3800 | 8.8 | 6.9 | |
| 3 | 20.8 | 20.1 | 418.1 | 3500 | 8.4 | 6.6 | |
| 4 | 20.6 | 20.1 | 414.1 | 4300 | 10.4 | 8.2 | |
| 5 | 20.8 | 19.9 | 413.9 | 3500 | 8.5 | 6.7 | |
| 6 | 20.7 | 19.2 | 397.4 | 3600 | 9.1 | 7.1 | |
| 7 | 20.9 | 19.2 | 401.3 | 3900 | 9.7 | 7.6 | |
| 8 | 20.5 | 20.0 | 410.0 | 3500 | 8.5 | 6.7 | |
| 9 | 20.5 | 19.3 | 395.7 | 4000 | 10.1 | 7.9 | |
| 10 | 20.5 | 19.8 | 405.9 | 2900 | 7.1 | 8.6 | |
| 11 | 20.4 | 20.3 | 414.1 | 3800 | 9.2 | 8.4 | |
| 12 | 21.1 | 19.7 | 415.7 | 4200 | 10.1 | 7.4 | |
| 13 | 21.0 | 19.4 | 407.4 | 4500 | 11.0 | 8.6 | |
| 14 | 20.8 | 19.3 | 401.4 | 4300 | 10.7 | 7.4 | |
| 15 | 21.1 | 20.2 | 426.2 | 4000 | 9.4 | 8.9 | |
| 16 | 20.4 | 19.2 | 391.7 | 4200 | 10.7 | 7.3 | |
| 17 | 20.9 | 19.7 | 411.7 | 3900 | 9.5 | 8.3 | |
| 18 | 19.9 | 19.5 | 388.1 | 4400 | 11.3 | 7.6 | |
| 19 | 20.4 | 19.5 | 397.8 | 3700 | 9.3 | 6.7 | |
| 20 | 20.3 | 19.6 | 397.9 | 4200 | 10.6 | 7.8 | |
| 21 | 20.6 | 19.6 | 403.8 | 3900 | 9.7 | 6.9 | |
| 22 | 19.7 | 20.0 | 394.0 | 3400 | 8.6 | 7.7 | |
| 23 | 20.5 | 20.2 | 414.1 | 4100 | 9.9 | 7.8 | |
| 24 | 20.9 | 20.1 | 420.1 | 3700 | 8.8 | 6.9 | |
| 25 | 21.7 | 20.2 | 438.3 | 4300 | 9.8 | 7.7 | |
| 26 | 20.0 | 20.0 | 400.0 | 4000 | 10.0 | 7.8 | |
| 27 | 19.2 | 19.8 | 380.2 | 4800 | 12.6 | 9.8 | |
| 28 | 20.1 | 19.5 | 392.0 | 4700 | 12.0 | 9.4 | |
| 29 | 20.1 | 19.6 | 394.0 | 5200 | 13.2 | 10.3 | |
| 30 | 19.9 | 19.7 | 392.0 | 4800 | 12.2 | 9.6 | |
| * X＝10.0 S＝1.35 Sr＝±0.25 V＝13.5％ P＝5％ | |||||||
Table 5 wood grain tensile strength test records table tree species: the production area of the poplar: great room temperature: 22 ℃ laboratory relative humidity: 60% of the test piece has a water content of 7.2%
| Test specimen Numbering | Effective part size (mm) of sample | Maximum load (N) | Tensile strength (MPa) | Remarks for note | ||
| Width of | Thickness of | At the time of testing* | The water content is 12% | |||
| 1 | 4.15 | 4.21 | 2300 | 131.6 | 122.1 | |
| 2 | 4.23 | 4.55 | 1600 | 83.1 | 77.1 | |
| 3 | 4.94 | 4.16 | 2300 | 111.9 | 103.0 | |
| 4 | 2.6 | 4.0 | 1300 | 125.0 | 116.0 | |
| 5 | 4.30 | 4.58 | 1640 | 83.3 | 77.3 | |
| 6 | 4.7 | 5.4 | 2350 | 92.6 | 85.9 | |
| 7 | 4.3 | 4.5 | 2350 | 121.4 | 112.7 | |
| 8 | 4.3 | 4.71 | 2070 | 102.2 | 94.8 | |
| 9 | 4.36 | 5.1 | 2350 | 105.7 | 98.1 | |
| 10 | 4.3 | 4.73 | 2350 | 115.5 | 107.2 | |
| 11 | 3.80 | 5.0 | 1890 | 109.9 | 102.0 | |
| 12 | 4.05 | 4.9 | 2250 | 113.4 | 105.2 | |
| 13 | 4.82 | 4.2 | 2350 | 116.1 | 107.7 | |
| 14 | 3.79 | 4.10 | 1900 | 122.3 | 113.5 | |
| 15 | 3.70 | 3.20 | 840 | 70.9 | 65.8 | |
| 16 | 4.10 | 3.40 | 1575 | 113.0 | 104.9 | |
| 17 | 4.00 | 3.10 | 1000 | 80.6 | 74.8 | |
| 18 | 3.40 | 3.00 | 840 | 82.4 | 76.4 | |
| 19 | 4.10 | 3.50 | 1575 | 109.8 | 101.9 | |
| 20 | 4.60 | 3.20 | 930 | 63.2 | 58.6 | |
| 21 | 3.90 | 2.40 | 1000 | 106.8 | 99.1 | |
| 22 | 5.4 | 2.7 | 1100 | 75.4 | 70.0 | |
| 23 | 4.0 | 6.0 | 1690 | 68.1 | 63.2 | |
| 24 | 5.3 | 5.7 | 2330 | 77.1 | 71.5 | |
| 25 | 5.1 | 5.5 | 1880 | 67.0 | 62.2 | |
| 26 | 4.5 | 3.1 | 1030 | 73.8 | 68.5 | |
| 27 | 4.5 | 5.3 | 1350 | 56.6 | 52.5 | |
| 28 | 4.75 | 4.16 | 1480 | 74.9 | 69.5 | |
| 29 | 4.10 | 2.60 | 690 | 64.7 | 60.0 | |
| 30 | 4.70 | 2.40 | 690 | 61.2 | 56.8 | |
| * X＝92.7 S＝23.1 Sr＝±4.21 V＝24％ P＝9％ | ||||||
Table 6 wood bending strength test records table tree species: the production area of the poplar: great room temperature: 22 ℃ laboratory relative humidity: 60% of the test piece has a water content of 7.2%
| Test specimen Numbering | Sample size (mm) | Maximum load (N) | Bending strength (MPa) | Remarks for note | ||
| Width of | Height | At the time of testing* | The water content is 12% | |||
| 1 | 20.7 | 20.2 | 2840 | 121.0 | 97.8 | |
| 2 | 21.3 | 20.3 | 2280 | 93.5 | 75.5 | |
| 3 | 20.7 | 20.3 | 2140 | 90.3 | 73.0 | |
| 4 | 21.0 | 20.6 | 1840 | 74.3 | 60.0 | |
| 5 | 20.7 | 20.4 | 2170 | 90.7 | 73.3 | |
| 6 | 21.6 | 20.2 | 2070 | 84.6 | 68.4 | |
| 7 | 20.1 | 20.6 | 1970 | 83.1 | 67.1 | |
| 8 | 21.0 | 20.4 | 2130 | 87.7 | 70.9 | |
| 9 | 20.8 | 21.0 | 2690 | 105.6 | 85.3 | |
| 10 | 20.5 | 20.3 | 2190 | 93.3 | 75.4 | |
| 11 | 21.8 | 21.0 | 2410 | 86.9 | 70.2 | |
| 12 | 21.7 | 19.5 | 2800 | 109.8 | 88.7 | |
| 13 | 21.1 | 21.9 | 2670 | 98.6 | 79.7 | |
| 14 | 20.8 | 21.0 | 2180 | 86.4 | 69.8 | |
| 15 | 22.0 | 19.8 | 2280 | 85.6 | 69.2 | |
| 16 | 21.7 | 21.3 | 2980 | 107.0 | 86.5 | |
| 17 | 20.2 | 21.5 | 2280 | 93.6 | 75.6 | |
| 18 | 21.1 | 19.5 | 2050 | 92.0 | 74.3 | |
| 19 | 19.9 | 19.7 | 2140 | 99.8 | 80.6 | |
| 20 | 21.3 | 20.2 | 3000 | 124.3 | 97.9 | |
| 21 | 21.0 | 20.4 | 2420 | 99.7 | 80.6 | |
| 22 | 19.9 | 20.7 | 2870 | 121.2 | 97.9 | |
| 23 | 19.6 | 20.3 | 2350 | 104.7 | 84.6 | |
| 24 | 22.9 | 20.7 | 3180 | 116.7 | 94.3 | |
| 25 | 20.8 | 21.0 | 2520 | 98.9 | 79.9 | |
| 26 | 19.7 | 20.3 | 2150 | 95.3 | 77.0 | |
| 27 | 20.8 | 19.9 | 2350 | 102.7 | 83.0 | |
| 28 | 21.2 | 20.4 | 2620 | 106.9 | 86.4 | |
| 29 | 20.3 | 20.6 | 2250 | 94.0 | 70.0 | |
| 30 | 21.0 | 20.0 | 2540 | 108.9 | 88.0 | |
| * X＝98.6 S＝12.2 Sr＝±2.22 V＝12.4％ P＝4.5％ | ||||||
TABLE 7 Wood resistanceThe bending elastic modulus test records the tree species: the production area of the poplar: great room temperature: 22 ℃ laboratory relative humidity: 60% of the test piece has a water content of 7.2%
| Test specimen Numbering | Size of sample (mm) | Deformation (mm) | Modulus of elasticity (MPa) | Prepare for Note that | ||||||||||
| Lower limit (N) | Upper limit (N) | Upper and lower limit change Shape difference (mm) | ||||||||||||
| Width of | Thickness of | 2 nd time | 3 rd time | 4 th time | Average | 2 nd time | 3 rd time | 4 th time | Average | At the time of testing* | The water content is 12% | |||
| 1 | 20.7 | 20.2 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.713 | 11605 | 10769 | |
| 2 | 21.3 | 20.3 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.64 | 12122 | 11244 | |
| 3 | 20.7 | 20.3 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.66 | 12096 | 11225 | |
| 4 | 20.3 | 20.5 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.73 | 10978 | 10188 | |
| 5 | 21.0 | 20.6 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.80 | 9413 | 8735 | |
| 6 | 20.3 | 20.1 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.74 | 11487 | 10660 | |
| 7 | 21.6 | 20.2 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.71 | 11092 | 10293 | |
| 8 | 20.7 | 20.4 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.68 | 11568 | 10735 | |
| 9 | 21.6 | 20.4 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.70 | 10769 | 9994 | |
| 10 | 21.2 | 21.9 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.62 | 9854 | 9145 | |
| 11 | 20.9 | 20.6 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.69 | 10657 | 9890 | |
| 12 | 20.1 | 20.6 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.79 | 10086 | 9360 | |
| 13 | 21.0 | 20.4 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.68 | 11238 | 10429 | |
| 14 | 20.8 | 21.0 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.64 | 11213 | 10406 | |
| 15 | 20.5 | 20.3 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.76 | 10607 | 9843 | |
| 16 | 19.7 | 21.1 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.73 | 10294 | 9553 | |
| 17 | 19.9 | 21.1 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.70 | 10525 | 9767 | |
| 18 | 19.9 | 21.3 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.67 | 10695 | 9925 | |
| 19 | 20.9 | 19.4 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.82 | 10993 | 10202 | |
| 20 | 19.6 | 21.1 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.73 | 10298 | 9557 | |
| 21 | 20.9 | 19.8 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.81 | 10476 | 9722 | |
| 22 | 19.8 | 20.8 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.75 | 10378 | 9631 | |
| 23 | 20.2 | 20.9 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.68 | 11069 | 10272 | |
| 24 | 19.7 | 21.1 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.69 | 10802 | 10024 | |
| 25 | 20.6 | 21.5 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.64 | 10506 | 9750 | |
| 26 | 20.2 | 21.5 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.60 | 11471 | 10645 | |
| 27 | 21.1 | 21.9 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.62 | 10029 | 9307 | |
| 28 | 21.7 | 19.5 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.85 | 10055 | 9331 | |
| 29 | 21.0 | 20.4 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.78 | 9889 | 9177 | |
| 30 | 20.4 | 21.0 | 300 | 300 | 300 | 300 | 700 | 700 | 700 | 700 | 0.75 | 9694 | 8996 | |
| * X＝10732 S＝684 Sr＝±125 V＝6.3％ P＝2.3％ | ||||||||||||||
Compared with common poplar, the poplar high polymer composite material has the density 1.6 times that of common poplar, the hardness 3.3 times, the pressure resistance 2.2 times that of common poplar, the pressure resistance 1.5 times that of transverse striation, the shear resistance 2.1 of common poplar, the static bending strength and the elastic modulus slightly higher than those of poplar, and compared with northeast China ash, the poplar high polymer composite material has the density 1.5 times that of northeast China ash, the hardness 1.9 times, the pressure resistance 1.5 times that of common willow, the pressure resistance 1.5 times that of transverse striation, the shear resistance 1.3 times that of common poplar, and the static bending strength, the elastic modulus and the tensile strength of common poplar are basically the. It can be seen from the attached figures 1 and 2 that the common poplar and the poplar high polymer composite material prepared by the embodiment have a plurality of gaps when observed under an electron microscope, the gaps of the poplar high polymer composite material are filled with the filling blocks, the poplar and the filling monomers form a wood-plastic composite, the gaps are reduced, the good mechanical property of the material is ensured, and on the other hand, various auxiliary agents are filled to ensure that the composite material has the advantages of flame retardance, corrosion resistance, wear resistance and the like, and the good mechanical property greatly improves the inferior performance of the poplar.
The multifunctional monomer as additive can improve the mechanical property of the product of the invention, which is closely related with other molecular structures. 
Vinylpyrrolidone urea methylene bisacrylamide
They act primarily to strengthen the cross-linking in a multi-component impregnating solution. In order to achieve a radiation crosslinking degree with application value at a lower dosage, the invention researches the radiation crosslinking under various organic or inorganic additives, and finds that the addition of the multifunctional monomer is most beneficial to improving the radiation crosslinking. Among the reinforcing crosslinking agents, monofunctional groups have the worst effect, and difunctional groups have the second best effect, and trifunctional groups have the best effect.
From the consideration of reaction mechanism, the reinforced crosslinking is different from the simple crosslinking reaction, and the reinforced crosslinking not only has the graft polymerization reaction of opening the double bonds of the olefin, but also has the crosslinking of intermolecular bridges, and is a composite reaction. The irradiation crosslinking can be caused to produce a sensitizing reaction because the amount of double bonds opened for polymerization is much smaller than that required for general crosslinking. The multifunctional monomer adopted by the invention is as follows: the molecular structures of the urea, the vinyl pyrrolidone and the methylene bisacrylamide all have nitrogen atoms adjacent to C ═ O groups, and the nitrogen atoms have a pair of arc pair electrons, so that intermolecular bridging between a supporter and a wood cellulose framework can be promoted, and radiation crosslinking can also be promoted.
The polyfunctional monomer-enhanced crosslinking reaction model is as follows:
P1，P2… is free polymer chain, M is polyfunctional monomer, the following reactions can be made:
Because the polyfunctional additive can play a role in strengthening crosslinking, the product of the invention containing the additive in the multi-component formula has better physical and mechanical properties than the product of the invention without the additive. As can be seen from fig. 3-6, no matter the impregnation solution monomer with the same WPC concentration in aqueous solution and methanol solution contains a multi-component formulation without additives, the physical and mechanical properties are basically optimized by acrylamide + 1% NVP + 1% U + 1% BiS, and are acrylamide + 1% NVP + 1% U, and acrylamide + 1% NVP in the following order. FIGS. 4-6 further show that increasing the concentration of multifunctional monomer can also improve the physical and mechanical properties of the product of the present invention. The relationship between cost and performance improvement is comprehensively considered, and the additive concentration of 1% is selected to be optimal.
In addition, the process of impregnating and radiation polymerizing wood to form the product of the present invention is a complex physical and chemical process. The product performance is closely related to the characteristics of wood and the process conditions.
The cell wall of wood is composed of cellulose, hemicellulose, which belong to polysaccharides, and lignin, which belongs to aromatic compounds. Cellulose is the skeletal substance of cell walls, accounting for 50% of the cell wall composition. Therefore, the physical and chemical properties of wood are closely related to those of cellulose.
Cellulose is a continuous structure formed by a plurality of macromolecules, and molecular chains are arranged in parallel and well oriented at the most compact part of the macromolecules to form a crystalline region of thecellulose. The bonding force (hydrogen chain, van der waals force) between molecular chains increases with decreasing distance. When the density is reduced, the bonding degree of macromolecular chains among each other is weakened, and the macromolecular chains have larger gaps and tend to be arranged non-parallel to become an amorphous area (namely an amorphous area) of cellulose. There is no clear absolute boundary between crystalline and amorphous regions. The cellulose molecules have a continuous structure in the long chain direction. A macromolecular chain, a portion of which may be located in the crystalline region of cellulose. Another portion may be located in the amorphous region and extend into another crystalline region. In the wood cellulose, the crystallinity and the crystallization area account for a large part, and the physical and mechanical properties of the wood are better.
Cellulose is a water-insoluble homoglycan, a linear macromolecular compound made up of a large number of glucosyl groups linked by chains of the formula β -1.4.
The cellulose molecules may undergo chemical reactions such as oxidation, esterification, and the like. The cellulose can be crosslinked by means of a crosslinking agent, for example, compounds containing epoxy groups, and can also be graft-polymerized with vinyl monomers.
The properties of cellulose make it possible to prepare the products of the invention by radiation polymerisation of wood impregnating monomers. Monomers such as acrylamide, styrene and the like are immersed in wood, enter gaps and cell walls, and initiate radiation polymerization, radiation graft copolymerization and radiation crosslinking under the action of gamma rays, the homopolymerization among the monomers, the graft copolymerization of the monomers and cellulose in a poplar substrate, and the radiation crosslinking reactionbetween the graft copolymer and the cellulose, wherein the polymerization mechanism is free radical polymerization.
Radical polymerization is a typical chain reaction, and the system absorbs ionizing radiation energy to generate radicals.
(1) Mechanism of homopolymerization of monomer
Chain initiation: m monomer, R radical
Chain proliferation:
chain termination: free radical recombination
(2) Mechanism of grafting reaction
Chain initiation: c fiber framework M monomer C, M.radical
Chain growth:
chain termination:
due to the higher irradiation dose used to prepare the product of the invention. In the order of tens of KGy, besides monomer homopolymerization and graft copolymerization, the irradiation crosslinking reaction also accounts for a larger part, the homopolymer and the graft copolymer are subjected to irradiation crosslinking to connect high molecular chains together, the molecular weight is increased, and finally a network structure between cellulose molecules and the copolymer is formed, and the performance of the WPC material is determined by the crosslinking degree of the product to a great extent.
The increase of the irradiation dose necessarily causes the increase of the number of free radicals of cellulose in the poplar and monomers impregnated in the poplar, the probability of mutual reaction is greatly increased, and the polymerization degree and the grafting rate are correspondingly increased. The increase of the irradiation dose increases the crosslinking degree of the product of the invention, and the product forms a body-shaped reticular structure, so that the arrangement of cellulose molecular chains is more compact, the number of crystalline regions is increased, and the crosslinking degree of the polymer is increased. Therefore, the physical and mechanical properties of the product of the invention are improved along with the increase of irradiation dose, and the performance of the product is higher than that of the common material. The irradiation dose selected by the invention is reasonable.
Example 2
The procedure of example 1 was repeated except that styrene as a basic monomer was dissolved in methanol or water to prepare a solution having a concentration of 70%.
EXAMPLE 3
The procedure of example 1 was repeated, except that the essential monomer was methyl methacrylate dissolved in methanol or water to give a concentration of 90%.
Example 4
The procedure was as in example 1 except that propylene as the essential monomer or trimethyl amide was used in a concentration of 80%.
Example 5
The procedure of example 1 was followed, except that the polyfunctional monomer was trimethylolpropane triacrylate, trimethylethylene glycol diacrylate or hexanediol diacrylate at a concentration of 1%.
Example 6
The procedure is as in example 1 except that the flame retardant and preservative are not contained.
Example 7
The solvent was used with water, and the preparation method was the same as in example 1 except that the multifunctional monomer was glycidyl acrylate, 1% vinylpyrrolidone, 1% methylenebisacrylamide, and 1% lithium nitrate as a preservative.
Example 8
The procedure was as in example 1 except that the wood sample was birch.
Example 9
The procedure was as in example 3 except that glycidyl acrylate having a polyfunctional monomer concentration of 1%, vinylpyrrolidone having a concentration of 1%, and methylenebisacrylamide having a concentration of 1%.
Example 10
The formula of the multifunctional monomer immersion liquid is the same as that in example 1, the irradiation dose is within 300Kgy, and all sides of the wood are overturned in the irradiation process so as to ensure uniform irradiation, and the rest methods are the same as those in example 1.
Example 11
The basic monomer acrylamide is added into the formula of the dipping solution in example 1 to prepare the dipping solution with the concentration of 40%, the physical and mechanical properties of the product of the invention of different concentrations of the dipping monomer are shown in figure 3 for four systems of acrylamide methanol solution, aqueous solution, methanol-aqueous solution and styrene methanol solution (the rest is the same as example 1).
(1) The following conclusions can be drawn from the figure: in four systems, the physical mechanical property of the product of the invention is improved along with the increase of the concentration of the impregnating monomer, and when the concentration of the monomer is increased to about 70 percent, the physical mechanical property index of the product of the invention reaches a peak value.
Under the condition of the same irradiation dose, the monomer amount entering the poplar wood sample is increased due to the increase of the concentration of the impregnation monomer, so that the possibility that free radicals generated by irradiation in the cellulose can react with monomer molecules is increased. In addition, the viscosity of the solution is increased along with the increase of the monomer concentration, the service life of free radicals and monomer free radicals on the cellulose is prolonged, because the activity of the free radicals in the viscous solution is reduced, the occurrence of chain termination caused by free radical recombination is reduced, and the possibility of graft and crosslinking reaction between the cellulose and the impregnated monomer is increased due to the reduction of the chain termination speed and the increase of the service life of the free radicals, which is the main reason that the physical and mechanical properties of the product of the invention are improved along with the increase of the impregnated monomer concentration. Meanwhile, the impregnation amount is increased, so that the proportion of the polymer in the product of the invention is increased, and the good performance of the polymer also leads to the improvement of the performance of the product of the invention.
The concentration of the proper impregnation monomer solution with the best performance of the product of the invention is about 70 percent.
(2) In the formula of the multi-component impregnating solution, the solvent effect (especially methanol to cellulose or a good swelling agent) also has great influence on the physical and mechanical properties of the WPC material. As seen from FIG. 3, WPC impregnated with methanol solution of acrylamide of the same concentration has better physical and mechanical properties than the product of the present invention impregnated with aqueous solution of acrylamide. The absorption capacity of poplar to the impregnation liquid of the methanol system is larger than that of a water system, so that the monomer amount participating in grafting and crosslinking reaction with poplar is correspondingly increased, and the product of the invention using the methanol system has better physical and mechanical properties. And the radiolysis product of methanol-CH2，-OCH3Also participates in the grafting reaction. This tooThe grafting rate of the product of the invention is improved, and the product of the invention treated by a methanol system has better performance than a water system. Meanwhile, the performance of the product of the invention obtained by treating poplar wood with a methanol-water (1: 1) solution of acrylamide is basically between the two performances, which shows that the swelling performance of methanol on cellulose is excellent.
(3) Compared with two monomers of acrylamide and styrene, the impregnated absorption amount of the poplar to the acrylamide is larger than that of the styrene, which can be obtained from a relation graph of the monomer concentration and the product density of the invention in figure 3. The density of the products of the invention of the acrylamide series is improved to a different extent than that of the styrene series, preferably to a monomer concentration of 50%, and the density of the products of the invention treated with a solution of acrylamide in methanol is 0.75g/cm3While the density of the styrene-treated product of the invention was 0.548g/cm3The difference is 24% because the water-soluble monomer has a higher affinity for cellulose than the styrene solution. Compared with styrene monomer, acrylamide monomer is easier to be impregnated into poplar to react with poplar.
In this case, the mechanical properties of the acrylamide-treated product of the present invention are better than those of the styrene-treated product of the present invention, but it is determined that the water resistance of the styrene-treated product of the present invention is better than that of the acrylamide-treated product of the present invention due to the hydrophobicity of the styrene monomer, which can be concluded from the data of the swelling ratio and the dry shrinkage index under the same concentration condition.
Claims (3)
1. A method for producing the wood high polymer composite material with good corrosion resistance, flame retardance and mechanical property comprises the steps of cleaning raw materials, carrying out a drying process for removing moisture, and then putting the raw materials into an impregnating solution for impregnation, and is characterized in that: the impregnation liquid comprises:
(1) water and methanol are used as solvents;
(2) the solute comprises acrylamide, methyl, ethyl or butyl (meth) acrylate, styrene, acrylonitrile, and its concentration is 30-90% Kg/L; also includes a multifunctional monomer: n-vinyl pyrrolidone, trimethylethylene glycol diacrylate, trimethylolpropane triacrylate, glycidyl acrylate, hexanediol diacrylate, methylene bisacrylamide, the concentration range of which is 0.5 to 3 percent Kg/L; and the impregnation process comprises the steps of:
(1) the wood to be treated is put into a vacuum drier and dried for 12 to 48 hours under the conditions of 1 to 50mmHg, vacuum degree and temperature of 50 to 90 ℃.
(2) Quickly putting the dried wood into an impregnator for impregnation, keeping the reduced pressure at 1-10mmHg for 0.5-5 hours at normal temperature, introducing nitrogen with general protection amount into the impregnator, injecting impregnation liquid, finally, impregnating the wood in the impregnator at normal pressure or 1-3 atmospheric pressure for 12-48 hours at the temperature of 20-50 ℃, taking out the wood, and wiping the wood with absorbent paper for later use;
(3) uniformly irradiating the impregnated wood by using electron beams under the protection of nitrogen, wherein the irradiation dose is in the range of 40-300Kgy, and the surfaces of the wood are overturned in the irradiation process, and the flow rate under the protection of nitrogen is the general protection amount.
2. The method for producing the wood high polymer composite material with corrosion resistance, flame retardance and excellent mechanical property according to claim 1 is characterized in that: the impregnation liquid also comprises a preservative added with lithium nitrate and copper nitrate, and the concentration is 0.5-3% Kg/L.
3. The wood high polymer composite material with corrosion resistance, flame retardance and excellent mechanical property and the manufacturing method thereof according to the claims 1 and 4 are characterized in that: the dipping solution also comprises a chlorinated paraffin oil flame retardant with the concentration of 5-40% Kg/L.
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