CN106479057A - A kind of low-density and high-strength modified polypropylene material and production method - Google Patents

Abstract

The invention discloses a low-density high-strength modified polypropylene material and a production method. The proportion of each component is as follows: 46%-65% of polypropylene, 11%-22% of toughening agent, light weight Powder filler 9%~18%, chopped glass fiber 6%~15%, compatibilizer 5%~9%, lubricant 1.8%~3%, coupling agent 0.9%~2.6%, antioxidant 0.5% ~0.9%. The present invention selects the hollow inorganic powder filler as the filling material and the chopped glass fiber as the reinforcing material, fully utilizes the synergistic effect of the two, and improves the bonding between the hollow inorganic powder and the resin through a reasonable modification process and production method. While ensuring the integrity of the hollow inorganic powder particle structure, the final material has excellent properties of low density and high strength. The low-density and high-strength modified polypropylene material of the present invention can meet the performance requirements of most plastics in the manufacturing fields of automobiles, home appliances, rail transit, aerospace, ships, submarines, and modern sponge city construction, and promote energy saving and emission reduction in the above fields. Low-carbon and environmentally friendly development.

Description

A low-density high-strength modified polypropylene material and its production method

technical field

The invention belongs to the technical field of polymer materials, and in particular relates to a modified polypropylene material with low density and high mechanical strength and a production method.

Background technique

Polypropylene is a polymer made of propylene as a monomer. It has the advantages of high strength, high hardness, wear resistance, bending fatigue resistance, heat resistance, moisture resistance and chemical resistance, easy processing and molding, and low price. High impact resistance, strong mechanical properties, resistance to various organic solvents and acid and alkali corrosion, have been widely used in the industry. However, polypropylene materials have disadvantages such as large shrinkage rate, poor dimensional stability of products, and easy warping and deformation; easy to break at low temperature, poor low temperature toughness; poor light resistance and heat aging resistance, etc. The polypropylene material must be modified to meet the final Requirements for the use of plastic products.

At present, the methods for modifying polypropylene materials include: plasma surface modification, additive modification, and blending modified polymers. Additives modify polypropylene fiber to make it have a variety of new properties, such as impact resistance, antistatic properties, antibacterial properties, deodorizing health care, mosquito repellent properties, etc. For example, 0.25% β-crystal nucleating agent is used to modify polypropylene fiber. After adding nucleating agent to modify, modified β-crystal polypropylene fiber is generated, which reduces the molecular weight and distribution of polypropylene and improves the polypropylene fiber. Excellent spinnability, its impact resistance is greatly improved. Chinese patent CN1916067 discloses a modified weather-resistant polypropylene material, which is mainly used to manufacture household appliance parts, such as air conditioner outdoor unit casings and auto parts such as instrument panels, bumpers, etc. The weight percentage of its raw materials is: Polypropylene Propylene resin 65%-85%, toughening modifier 1%-18%, mineral reinforcing agent 0%-25%, coupling agent 0.1%-0.8%, processing aid 0.2%-2%, light stabilizer 0.2% %-2%, colorant 0.2%-1.5%. Compared with the existing polypropylene material, the modified material of the invention has significantly improved weather resistance and aging resistance, but the mechanical strength has not been improved, and the density of the material is still high. A large number of tests have shown that when the filling amount of inorganic mineral fillers in polypropylene increases from 0 to 40wt.%, the material density will increase rapidly from 0.89g/cm ³ to 0.92g/cm ³ of pure polypropylene to 1.20g/cm ³ ~1.24 g/cm ³ .

Today, plastics, steel, wood, and cement together constitute the four basic materials of modern industry, and with the development of material technology and the continuous improvement of energy-saving, low-carbon and environmental protection requirements, its application fields have far surpassed the other three traditional industries . Replacing steel with plastic and wood with plastic has already become an important way to reduce the weight of automobiles, home appliances, rail transit, aerospace, ships, and submarines. However, reports and patents on plastic modification and processing can be seen everywhere, but research and patents on plastic lightweighting are rare. Although the patent CN 104629174 A discloses a lightweight polypropylene material, and the patent CN104774377 A discloses a lightweight environmentally friendly polypropylene composite material, it can be found that these so-called lightweight polypropylene materials do not have It is a component that can really play a role in reducing weight, and none of the instructions mentions the advantages of the final polypropylene material in terms of density compared with conventional market materials. On the other hand, even if there are a few foreign products that can meet the requirements, the price is very expensive, resulting in low cost performance of the final product, which strictly limits the large-scale industrial implementation and application of this material.

Contents of the invention

The purpose of the present invention is to provide a low-density and high-strength modified polypropylene with high cost performance and large-scale industrial implementation for the defects of existing modified polypropylene materials such as high density, low compressive strength, and difficulty in industrial implementation. Material.

Another object of the present invention is to provide a method for producing a low-density high-strength modified polypropylene material.

In order to achieve the above-mentioned purpose of the present invention, a kind of low-density high-strength modified polypropylene material of the present invention adopts the following technical solutions:

A low-density high-strength modified polypropylene material of the present invention is prepared by mixing the following components and proportions, and the proportions of each component of the raw materials are as follows in terms of mass percentage:

The polypropylene is homopolypropylene, copolymerized polypropylene or a mixture of the two, and its melt flow rate is 10g/10min to 100g/10min; when used in combination, the ratio of homopolypropylene and copolymerized polypropylene is controlled Between 2 and 4, in order to exert the synergistic effect of the two.

The toughening agent is one of EPDM rubber and polyolefin elastomer or a mixture of both.

The light powder filler is a hollow glass microsphere with a particle size distribution between 2 μm and 200 μm, a true density between 0.20 and 0.60 g/cm ³ , and an air pressure resistance ≧12 MPa.

The chopped glass fiber has a length of 3.0 mm to 6.0 mm and a fiber diameter of

Alkali-free chopped glass fiber for reinforced polypropylene with a thickness of 10 μm to 13 μm.

The compatibilizer is a maleic anhydride graft polymer with a maleic anhydride grafting rate of 0.65% to 0.90%, preferably maleic anhydride grafted polypropylene, maleic anhydride grafted polyethylene, maleic anhydride grafted One or a mixture of two or more grafted polyolefin elastomers.

The lubricant is one or a mixture of two or more of hydrocarbons, fatty acids and their esters, and metal soaps.

The coupling agent is an amino-containing silane coupling agent.

The antioxidant is a mixture of hindered phenolic antioxidant and phosphite antioxidant.

A low-density high-strength modified polypropylene material of the present invention, the ratio of each component of the raw material is preferably:

The production method of a kind of low-density high-strength modified polypropylene material of the present invention adopts the following steps:

(1) Mix the polypropylene, toughening agent, compatibilizer, lubricant and antioxidant in the high-speed mixer, the speed of the high-speed mixer is controlled at 600rpm-1500rpm, and the final material temperature is controlled at 70°C-80°C ℃, the material is mixed evenly and unloaded for later use;

(2) Add the formulated amount of light powder filler and coupling agent into the high-speed mixer for activation and modification of the light powder filler. ℃;

(3) Mix the material prepared in step (2) and the chopped glass fiber evenly at room temperature in a high-speed mixer, and the speed of the high-speed mixer is controlled at 300rpm～500rpm;

(4) The materials prepared in step (1) and step (2) and chopped glass fiber, or the materials prepared in step (1) and step (3) are sent into the twin-screw from the main feeding port and the side feeding port respectively. Melt, knead and granulate in the extruder; during extrusion, the barrel temperature is controlled at 190°C to 230°C.

Through the implementation of the above technical solutions, compared with the prior art, a low-density high-strength modified polypropylene material and production method of the present invention have many advantages:

1. The surface activation treatment of lightweight powder fillers is carried out in advance through coupling agents, which effectively improves the dispersion of inorganic fillers in organic resins and the bonding fastness with organic resins, and the introduction through side feeding ports ensures The structural integrity of the hollow inorganic powder filler achieves the purpose of reducing the weight of the material.

2. Rigid and lightweight powder filler is used as a lightening agent, which can precisely control the material density while improving the mechanical properties of the material, effectively preventing glass fiber leakage, and the raw materials used are from a wide range of sources, domestic products can meet the requirements, and the obtained materials are cost-effective .

3. The present invention makes full use of the synergistic effect of light powder filler and chopped glass fiber to effectively improve the mechanical strength of the material while reducing the low density of the material.

4. The material of the present invention has low density and high strength, which can meet the performance requirements of most plastics in the manufacturing fields of automobiles, home appliances, rail transit, aerospace, ships, submarines and modern sponge city construction, and promote energy saving and emission reduction in the above fields. The development of carbon environmental protection, and the preparation process is simple, and can be implemented in large-scale industrialization.

detailed description

In order to better describe the present invention, the following examples will be used to further describe the low-density high-strength modified polypropylene material and production method of the present invention in detail. However, the present invention is not limited to the Examples. The percentages involved in the examples are by weight percentage.

Example 1:

A low-density high-strength modified polypropylene material, the formula of which is as follows:

Its production method comprises the following steps:

a. Mix the amount of M2600R, EPDM3745P, maleic anhydride grafted polypropylene, polyethylene wax and antioxidant 1010 in a high-speed mixer. The speed of the high-speed mixer is controlled at 500rpm-1500rpm, and the final material temperature is controlled at 70°C ~80°C, the materials are mixed evenly and unloaded for later use;

b. Add the formulated amount of GS60 and KH-550 into the high-speed mixer for activation and modification. The speed of the high-speed mixer is controlled at 500rpm-1000rpm, and the final material temperature is controlled at

85℃～95℃;

c. Mix the material prepared in step b with T438 evenly at room temperature in a high-speed mixer, and the speed of the high-speed mixer is controlled at 300rpm-500rpm;

d. The material prepared by step a and step b and T438, or the material prepared by step a and step c are sent into the twin-screw extruder from the main feed port and the side feed port respectively for melting, mixing, and granulation, During extrusion processing, the barrel temperature is controlled at 180°C to 240°C.

Example 2:

A low-density high-strength modified polypropylene material, the formula of which is as follows:

Its production method comprises the following steps:

a. Mix Y3000, POE5371, maleic anhydride grafted polypropylene, polyethylene wax and antioxidant 1010 in a high-speed mixer. The speed of the high-speed mixer is controlled at 500rpm-1500rpm, and the final material temperature is controlled at 70°C ~80°C, the materials are mixed evenly and unloaded for later use;

b. Add the formulated amount of GS60 and KH-550 into the high-speed mixer for activation and modification. The speed of the high-speed mixer is controlled at 500rpm-1000rpm, and the final material temperature is controlled at 85°C-95°C;

c. Mix the material prepared in step b with S508A evenly at room temperature in a high-speed mixer, and the speed of the high-speed mixer is controlled at 300rpm-500rpm;

d. The material prepared by step a and step b and S508A, or the material prepared by step a and step c are sent into the twin-screw extruder from the main feed port and the side feed port to melt, knead, and granulate, During extrusion processing, the barrel temperature is controlled at 180°C to 240°C.

Example 3:

A low-density high-strength modified polypropylene material, the formula of which is as follows:

Its production method comprises the following steps:

a. Mix K9920, K2420, POE5371, maleic anhydride-grafted polypropylene, polyethylene wax and antioxidant 1010 in a high-speed mixer. The speed of the high-speed mixer is controlled at 500rpm-1500rpm, and the final material temperature is controlled at 70 ℃ ~ 80 ℃, the material is mixed evenly and unloaded for later use;

b. Add the formulated amount of GS60 and KH-550 into the high-speed mixer for activation and modification. The speed of the high-speed mixer is controlled at 500rpm-1000rpm, and the final material temperature is controlled at 85°C-95°C;

c. Mix the material prepared in step b with S508A evenly at room temperature in a high-speed mixer, and the speed of the high-speed mixer is controlled at 300rpm-500rpm;

d. The material prepared by step a and step b and S508A, or the material prepared by step a and step c are sent into the twin-screw extruder from the main feed port and the side feed port to melt, knead, and granulate, During extrusion processing, the barrel temperature is controlled at 180°C to 240°C.

The physical parameters of the low-density high-strength modified polypropylene material obtained in the above embodiments 1 to 3 are shown in Table 1:

The physical parameters of the low-density high-strength modified polypropylene material obtained in Table 1 Examples 1-3

Table 2 shows the mass percentage (%) of each component of the raw materials of Examples 4-10 of the present invention.

Table 2 The raw materials of Examples 4 to 10 of the present invention are by mass percentage (%)

The raw material components in Examples 4-6 are the same as in Example 1, the raw material components in Examples 7-8 are the same as in Example 2, and the raw material components in Examples 9-10 are the same as in Example 3.

Test detection shows that the physical parameters of the low-density high-strength modified polypropylene material prepared in Examples 4-10 are as shown in Table 3:

Table 3 The physical parameters of the low-density high-strength modified polypropylene material obtained in Examples 4-10

It can be seen from Table 1 and Table 3 that the low-density high-strength modified polypropylene material obtained in the present invention has lower density and excellent mechanical properties, and has substantial characteristics and significant progress compared with the prior art. The low-density and high-strength modified polypropylene material obtained in the present invention is suitable for the performance requirements of most plastics in the manufacturing fields of automobiles, household appliances, rail transit, aerospace, ships, submarines, and the construction of modern sponge cities.

The above embodiments are only for the purposes of illustration of the present invention, and can not limit protection scope of the present invention with this, and those skilled in the art can also make various changes or modifications according to the spirit of the present invention, so all equivalent technical solutions All should also be covered within the protection scope of the present invention.

Claims (10)

1. a kind of low-density and high-strength modified polypropylene material is it is characterised in that be to be mixed with by following components, proportioning to form, Feed components by weight/mass percentage composition proportioning are：

2. as claimed in claim 1 a kind of low-density and high-strength modified polypropylene material it is characterised in that the quality of each component Percentage composition proportioning is：

3. as claimed in claim 1 or 2 a kind of low-density and high-strength modified polypropylene material it is characterised in that：Described is poly- Propylene is HOPP, COPP or both mixture, and its melt flow rate (MFR) is 10g/10min～100g/ 10min.

4. as claimed in claim 3 a kind of low-density and high-strength modified polypropylene material it is characterised in that：Described polypropylene For the mixture of HOPP, both COPPs, HOPP and the polyacrylic ratio of copolymerization control 2～4 it Between.

5. as claimed in claim 3 a kind of low-density and high-strength modified polypropylene material it is characterised in that：Described toughener For one of ethylene propylene diene rubber, polyolefin elastomer or both mixture.

6. as claimed in claim 5 a kind of low-density and high-strength modified polypropylene material it is characterised in that：Described light powder Body filler be particle diameter distribution between 2 μm～200 μm, true density is in 0.20～0.60g/cm³, anti-air pressure level 12MPa Hollow glass micropearl；Described chopped glass fiber is that length is gathered in 10 μm～13 μm of enhancing in 3.0mm～6.0mm, fibre diameter Propylene alkali-free chopped glass fiber.

7. as claimed in claim 6 a kind of low-density and high-strength modified polypropylene material it is characterised in that：Described compatilizer For maleic anhydride grafted polymer between 0.65%～0.90% for the maleic anhydride grafting ratio, preferably maleic anhydride grafting poly- third One of alkene, maleic anhydride grafted polyethylene, maleic anhydride stem grafting polyolefin elastomer or two kinds and above mixture；Institute The lubricant stated is one of hydro carbons, fitter acids and its ester class, metal soap or two kinds and above mixture；Described idol Connection agent is silane coupler containing amino；Described antioxidant is the mixing of Hinered phenols antioxidant and phosphite ester kind antioxidant Thing.

8. as claimed in claim 4 kind of low-density and high-strength modified polypropylene material it is characterised in that：Described toughener is One of ethylene propylene diene rubber, polyolefin elastomer or both mixture；Described light powder filler is particle diameter distribution Between 2 μm～200 μm, true density is in 0.20～0.60g/cm³, the hollow glass micropearl of anti-air pressure level 12MPa；Described Chopped glass fiber be length 3.0mm～6.0mm, fibre diameter 10 μm～13 μm RPP alkali-free be chopped glass Fine；Described compatilizer is maleic anhydride grafted polymer between 0.65%～0.90% for the maleic anhydride grafting ratio, preferably One of maleic anhydride inoculated polypropylene, maleic anhydride grafted polyethylene, maleic anhydride stem grafting polyolefin elastomer or two kinds And above mixture；Described lubricant be one of hydro carbons, fitter acids and its ester class, metal soap or two kinds and more than Mixture；Described coupling agent is silane coupler containing amino；Described antioxidant is Hinered phenols antioxidant and phosphorous The mixture of acid esters kind antioxidant.

9. as claimed in claim 7 a kind of production method of low-density and high-strength modified polypropylene material it is characterised in that adopting Use following processing step：

1) polypropylene of formula ratio, toughener, compatilizer, lubricant and antioxidant are mixed in high-speed mixer, mixed at a high speed Conjunction machine rotating speed controls in 600rpm～1500rpm, final material temperature control at 70 DEG C～80 DEG C, discharging after material mix homogeneously Standby；

It is 2) modified by carrying out light powder filler activator in the light powder filler of formula ratio, coupling agent addition high-speed mixer, High-speed mixer rotating speed controls in 500rpm～9000rpm, and final material temperature control is at 85 DEG C～95 DEG C；

3) material preparing step (2) is mixed homogeneously under room temperature in high-speed mixer with chopped glass fiber, and high-speed mixer turns Speed controls in 300rpm～500rpm；

4) material prepared by step (1) and step (2) and chopped glass fiber, or material prepared by step (1) and step (3) divides Do not send into melting double screw extruder, mixing, pelletize from main spout and side spout；During extrusion processing, barrel zone temperature control System is at 190 DEG C～230 DEG C.

10. as claimed in claim 9 a kind of production method of low-density and high-strength modified polypropylene material it is characterised in that： Described polypropylene is HOPP, the mixture of both COPPs, HOPP and the polyacrylic ratio of copolymerization Control between 2～4.