CN106801478B - Composite evacuated heat insulating thermal preserving board of Cement fibre felt and preparation method thereof - Google Patents

Abstract

The invention provides a cement fiber felt composite vacuum insulation board. The vacuum insulation board includes a core material and a high-strength gas barrier film with a protective layer. The high-strength gas barrier film with a protective layer It is wrapped around the periphery of the core material, and is sealed with the core material by vacuuming; the high-strength gas barrier film with a protective layer is composed of the outer protective layer and the inner sealing layer; wherein, the protective layer is Cement fiber felt. The composite vacuum insulation board with reasonable structure and outer protective layer of the invention solves the problem of damage and air leakage of the vacuum insulation board during construction, is convenient for construction and installation, and has excellent thermal insulation, safety, durability and light weight. Ultra-thin features, and facilitate the industrial production of vacuum insulation panels.

Description

Cement fiber felt composite vacuum insulation board and preparation method thereof

technical field

The invention belongs to the field of building thermal insulation, and particularly relates to a vacuum thermal insulation board and a manufacturing method thereof.

Background technique

Although the fire rating of the current common vacuum insulation board can reach the national standard of non-combustible or flame-retardant, the thermal insulation effect is good. However, they are easily scratched during the construction process, and the phenomenon of hollowing and air leakage occurs, and the utilization rate is greatly reduced.

In the prior art, there are low-alkali bonded mortar, foamed cement, inorganic thermal insulation mortar, and modified cement polystyrene particles coated on the outside of the vacuum insulation board, and the company has applied for a patent and obtained protection for the above technology. However, the above technologies have problems such as high cost and low heat resistance.

The invention provides a new replacement of the above-mentioned technology. The composite vacuum insulation board has a reasonable structure and an outer protective layer, which solves the problem of damage and air leakage of the vacuum insulation board during construction, and is convenient for construction and installation. It has the characteristics of excellent heat preservation, safety, durability, light weight and ultra-thinness, and is convenient for the industrial production of vacuum insulation panels.

SUMMARY OF THE INVENTION

In order to solve the problem that the STP vacuum panel is scratched during operation and affects the thermal insulation effect, we cover the surface of the STP vacuum panel with a layer of cement fiber felt, which can make the STP vacuum panel resistant to high temperature and effectively prevent the high temperature damage of the STP vacuum panel.

The technical scheme adopted in the present invention is as follows: a cement fiber felt composite vacuum thermal insulation board, the vacuum thermal insulation board comprises a core material and a high-strength gas barrier film with a protective layer, and the high-strength gas barrier film with a protective layer The strength gas barrier film is wrapped around the periphery of the core material, and is sealed with the core material by vacuuming; the high strength gas barrier film with a protective layer is composed of the outer protective layer and the inner sealing layer; wherein , the protective layer is cement fiber felt; the sealing layer is made of non-woven fabric, aluminum foil, aluminized film, polyester film, nylon film, polyethylene film, polyvinyl chloride film, polystyrene film, polyvinylidene chloride, polyethylene One or more of alcohol film, ethylene-vinyl acetate copolymer film, ethylene-vinyl alcohol copolymer film, polycarbonate film and polypropylene are compounded.

Preferably, the cement fiber mat is made by uniformly impregnating the whole fiber mat with the mixed slurry, and after pressing, drying and curing;

The mixed slurry includes the following components in parts by mass: 40-50 parts of cement, 30-45 parts of quartz sand, 8-15 parts of heavy calcium, 5-10 parts of rubber powder, 0.1-3 parts of admixture, water reducing 0.2-0.4 part of the agent, 0.4-0.8 part of the retarder, and the raw materials are fully mixed and stirred to get the product.

Preferably, the cement adopts the mixture of one or more of Portland cement, aluminate cement, sulfoaluminate cement, ferric aluminate cement, magnesia cement, and high-strength gypsum in any proportion. .

Preferably, the particle size of the quartz sand is 30-50 mesh or 50-80 mesh, and the appearance is smooth and without edges and corners.

Preferably, the admixture is a mixture obtained by combining one or more of polypropylene fibers, tartaric acid, hydroxypropyl methylcellulose, lignin and polyvinyl alcohol in any proportion.

Preferably, the water reducing agent is lignosulfonate or sulfonated melamine formaldehyde resin.

Preferably, the retarder is any one of monohydric alcohol, polyhydric alcohol, polyvinyl alcohol, carboxylate-based organic matter, tartaric acid, phosphate or borate.

Preferably, the fiber mat is formed by compounding one or more of glass fibers, ceramic fibers, and polyester fibers.

A preparation method of the cement fiber felt composite vacuum insulation board as described above, comprising the following steps:

(1) Flatten the sealing layer, and then take the mold of the size and press it on it, spread a layer of 1-5mm thick mixed slurry, so that the mixed slurry covers the sealing layer in the mold to form a transition bond layer, and then put into cement fiber felt, pressed for 8-24 hours, dried for 6-24 hours, and then demoulded to form a high-strength gas barrier film with a protective layer;

(2) The high-strength gas barrier film with a protective layer is wrapped around the periphery of the core material, and is sealed with the core material by vacuuming to form a cement fiber felt composite vacuum insulation board with a protective layer.

The beneficial effects of the present invention are:

1) The present invention provides a composite vacuum insulation board with a reasonable structure and an outer protective layer, which replaces the insulation board in the existing technology, and solves the problem of air leakage and hollowing of the vacuum insulation board due to damage during the construction process. The problem is that it affects the construction efficiency. The composite board has better pressure resistance and drop resistance, and is light in weight. The composite board is easy to construct and install, and the utilization rate is greatly improved;

2) Using the cement fiber felt as the wall material can effectively block the direct contact between the high temperature heat source and the STP vacuum panel, and solve the problem that the wall material of the STP vacuum panel is easily damaged in a high temperature environment;

3) The preparation steps of the composite vacuum insulation board are improved. Previously, the outer protective layer was covered on the basis of the prepared vacuum insulation board. In the present invention, a high-strength gas barrier film with an outer protective layer is first prepared, and then a vacuum heat insulation board is prepared. The advantage of this is that the operation steps are simplified, large-scale production is possible, and the cement fiber felt composite vacuum insulation board is easy to be integrally formed.

Detailed ways

A cement fiber felt composite vacuum insulation board, the vacuum insulation board includes a core material and a high-strength gas barrier film with a protective layer, and the high-strength gas barrier film with a protective layer is wrapped in the core material. The outer periphery of the film is sealed with the core material by vacuuming; the high-strength gas barrier film with the protective layer is composed of the outer protective layer and the inner sealing layer; wherein, the protective layer is cement fiber felt; The sealing layer is made of non-woven fabric, aluminum foil, aluminized film, polyester film, nylon film, polyethylene film, polyvinyl chloride film, polystyrene film, polyvinylidene chloride, polyvinyl alcohol film, ethylene-vinyl acetate copolymer It is composed of one or more of polymer film, ethylene-vinyl alcohol copolymer film, polycarbonate film and polypropylene.

Compared with the existing low-alkali bonded mortar, foamed cement, inorganic thermal insulation mortar, modified cement polystyrene particle coating and other existing technologies, the invention can improve the compression resistance by about 18%, and because the protective layer It is vacuumed after it is integrally formed with the sealing layer, so that a certain space will be formed between the core material and the gas barrier film. Therefore, compared with the existing technology, it has a lighter weight and can reduce the weight by about 16%. At the same time, because of the Fiber cement felt, which makes the insulation board have a higher bending strength, which can increase the bending strength by about 12%. At the same time, the thermal insulation performance of the present invention can be improved by about 47% compared with the prior art.

Preferably, the thickness of the fiber cement felt is 2-20 mm, which is used to greatly improve the durability, wear resistance, hardness of the gas barrier film and the thermal insulation performance of the entire thermal insulation board.

By coating the high-strength gas barrier film with a protective layer on the outside of the core material, on the one hand, the problem of damage to the vacuum insulation panel is solved, and at the same time, it solves the phenomenon that the vacuum insulation panel is easily damaged and damaged when working at high temperature, which saves costs and can be replaced. Related products in the current state of the art.

Preferably, the cement fiber mat is made by uniformly impregnating the whole fiber mat with the mixed slurry, and after pressing, drying and curing;

The mixed slurry includes the following components in parts by mass: 40-50 parts of cement, 30-45 parts of quartz sand, 8-15 parts of heavy calcium, 5-10 parts of rubber powder, 0.1-3 parts of admixture, water reducing 0.2-0.4 part of curing agent, 0.4-0.8 part of retarder.

Further preferably, the cement is 43-47 parts, quartz sand 34-40 parts, heavy calcium 8-10 parts, rubber powder 5-7 parts, admixtures 1.1-2.3 parts, water reducing agent 0.25-0.34 parts, retarder dose 0.6-0.7 servings.

Preferably, phase-change energy storage agent and heat-reflecting heat-insulating powder are further added to the slurry.

Preferably, the mass of the phase change energy storage agent is 10-15% of the mass of the mixed slurry before adding the phase change energy storage agent.

Preferably, the mass of the heat-reflecting and heat-insulating powder is 8-12% of the mass of the mixed slurry before adding the heat-reflecting and heat-insulating powder.

Preferably, the phase change energy storage agent uses one or more mixed inorganic hydrated salts among Na ₂ SO ₄ .10H ₂ O, CaCl ₂ .6H ₂ O, and Na ₂ HPO ₄ .12H ₂ O as capsules. Core of phase change microcapsules.

The diameter of the phase change microcapsules is 0.1-0.5mm, which is used to increase the thermal insulation and fine-tuning functions of the protective layer. If the particles of the phase-change microcapsules are too small, the coated phase change material will not be able to achieve a good fine-tuning effect. , if the phase change microcapsule particles are too large, it will affect the compression molding of the mixed slurry.

Preferably, the heat-reflecting heat-insulating powder is a mixture of one or more of nano-titanium oxide, vanadium oxide, iron oxide, hollow glass microbeads, sepiolite, and perlite in proportion to increase the protective layer's strength. Heat reflection function to improve the insulation performance of the entire insulation board.

By adding phase-change energy storage agent and heat-reflecting heat-insulating powder, the vacuum insulation panel has better thermal insulation functions such as phase-change energy storage and infrared reflection.

Preferably, the raw materials are fully mixed and stirred, and then water is added.

Preferably, the mass ratio of the mixture of water and the above components is 1:(1.5-4), preferably 1:2.

Preferably, the cement is a mixture composed of one or more of Portland cement, aluminate cement, sulfoaluminate cement, iron aluminate cement, magnesia cement, and high-strength gypsum in any proportion.

Preferably, the cement adopts Portland cement, aluminate cement, and sulfoaluminate cement, and the mass ratio thereof is 1:1:2.25.

Through the optimized selection of the above cement, the physical properties of the above mixed slurry can be improved.

Preferably, the particle size of the quartz sand is 30-50 mesh or 50-80 mesh, and the appearance is smooth and without edges and corners.

Preferably, the admixture is a mixture obtained by combining one or more of polypropylene fibers, tartaric acid, hydroxypropyl methylcellulose, lignin and polyvinyl alcohol in any proportion. The main function is to retain moisture, which is used to enhance the operability during construction.

Preferably, the water reducing agent is lignosulfonate or sulfonated melamine formaldehyde resin.

Preferably, the retarder is any one of monohydric alcohol, polyhydric alcohol, polyvinyl alcohol, carboxylate-based organic matter, tartaric acid, phosphate or borate.

Preferably, the fiber mat is composed of one or more of glass fibers, ceramic fibers, and polyester fibers.

A preparation method of the cement fiber felt composite vacuum insulation board as described above, comprising the following steps:

(1) After weighing the components of the mixed slurry, mix them thoroughly to obtain a mixture;

(2) after the mixture obtained in the step (1) is mixed with water, put into the mixer and stir for 10min to ensure full mixing, wherein the mass ratio of the mixture of water and the above-mentioned components is 1: 2;

(3) Flatten the sealing layer, and then press the mold of the specified size on it, spread a layer of 1-5mm thick mixed slurry, so that the mixed slurry covers the sealing layer in the mold to form a transition bond layer, and then put into cement fiber felt, pressed for 8-24 hours, dried for 6-24 hours, and then demoulded to form a high-strength gas barrier film with a protective layer;

(4) The high-strength gas barrier film with a protective layer is wrapped around the periphery of the core material, and is sealed with the core material by vacuuming to form a cement fiber felt composite vacuum insulation board with a protective layer.

The following will further illustrate through specific embodiments.

Example 1

A cement fiber felt composite vacuum insulation board, the mixed slurry comprises the following components by mass: 40 parts of cement, 45 parts of quartz sand, 8 parts of heavy calcium, 6 parts of rubber powder, 0.1 part of admixture, and 0.1 part of admixture. 0.2 part of water agent, 0.7 part of retarder, and the particle size of quartz sand is 80 mesh.

After the above-mentioned raw materials are accurately measured, put into a gravity-free dry powder mortar mixer, and after mechanical mixing, mix with water and continue to stir for 10min to ensure full mixing, wherein the mass ratio of the mixture of water and the above-mentioned components is 1: 2 .

Under the condition of this ratio, the sealing layer is flattened, and then the mold of the specified size is pressed on it, and a layer of 5mm thick mixed slurry is spread out, so that the mixed slurry covers the sealing layer in the mold to form a transitional stickiness. Then put into glass fiber mat, press for 8-24 hours, dry for 6-24 hours, and then demould to form a high-strength gas barrier film with a protective layer.

The high-strength gas barrier film with a protective layer is wrapped around the periphery of the core material, and is sealed with the core material by vacuuming to form a composite vacuum heat insulation with a protective layer of cement fiber felt with a size of 300×300×30mm. plate.

Under this process condition, the compressive strength of the cement fiber felt composite vacuum insulation board is 0.30MPa, the density is 405kg/m ³ , the flexural strength is 0.30MPa, and the thermal conductivity is 0.022 W/(m·K). The thermal insulation performance of the composite thermal insulation board is effectively improved.

As an improvement, the particle size of the quartz sand is 30 meshes. After testing, the compressive strength is 0.33MPa, and the compressive performance is further improved.

Example 2

A cement fiber felt composite vacuum insulation board, the mixed slurry includes the following components by mass: 45 parts of cement, 40 parts of quartz sand, 8 parts of heavy calcium, 6 parts of rubber powder, 0.1 part of admixture, and 0.1 part of admixture. 0.2 part of water agent, 0.7 part of retarder, of which the particle size of quartz sand is 30 meshes.

After the above-mentioned raw materials are accurately measured, put into a gravity-free dry powder mortar mixer, and after mechanically mixing, mix with water and continue to stir for 10min to ensure full mixing, wherein the mass ratio of the mixture of water and the above-mentioned components is 1: 2 .

Under the condition of this ratio, the sealing layer is flattened, and then the mold of the specified size is pressed on it, and a layer of 5mm thick mixed slurry is spread out, so that the mixed slurry covers the sealing layer in the mold to form a transitional stickiness. Then put the ceramic fiber felt into the layer, press it for 8-24 hours, dry it for 6-24 hours, and then demold it to form a high-strength gas barrier film with a protective layer.

The high-strength gas barrier film with a protective layer is wrapped around the periphery of the core material, and is sealed with the core material by vacuuming to form a composite vacuum heat insulation with a protective layer of cement fiber felt with a size of 300×300×30mm. plate.

As an improvement, phase-change energy storage agent and heat-reflecting heat-insulating powder were added, and the added mass was 10% of the mass of the mixed slurry before adding phase-change energy-storage agent and heat-reflecting heat-insulating powder, respectively. After testing, the compressive strength is 0.37MPa, the density is 394kg/m ³ , the flexural strength is 0.33MPa, the thermal conductivity is 0.019 W/(m·K), and the compressive and thermal insulation properties are further improved.

Example 3

A cement fiber felt composite vacuum insulation board, the mixed slurry includes the following components in parts by mass: 50 parts of cement, 30 parts of quartz sand, 12 parts of heavy calcium, 7 parts of rubber powder, 0.1 part of admixture, and 0.1 part of admixture. 0.2 part of water agent, 0.7 part of retarder, and the particle size of quartz sand is 30 meshes.

After the above-mentioned raw materials are accurately measured, put into a gravity-free dry powder mortar mixer, and after mechanically mixing, mix with water and continue to stir for 10min to ensure full mixing, wherein the mass ratio of the mixture of water and the above-mentioned components is 1: 2 .

Under the condition of this ratio, the sealing layer is flattened, and then the mold of the specified size is pressed on it, and a layer of 5mm thick mixed slurry is spread out, so that the mixed slurry covers the sealing layer in the mold to form a transitional stickiness. Then put it into polyester fiber felt, press it for 8-24 hours, dry it for 6-24 hours, and then demold it to form a high-strength gas barrier film with a protective layer.

The high-strength gas barrier film with a protective layer is wrapped around the periphery of the core material, and is sealed with the core material by vacuuming to form a composite vacuum heat insulation with a protective layer of cement fiber felt with a size of 300×300×30mm. plate.

Under this process condition, the compressive strength of the cement fiber felt composite vacuum insulation board is 0.34MPa, the density is 400kg/m ³ , the flexural strength is 0.31MPa, and the thermal conductivity is 0.0215 W/(m·K). The thermal insulation performance of the composite thermal insulation board is effectively improved.

Compared with the existing technologies such as foamed cement, inorganic thermal insulation mortar, modified cement polystyrene particle coating, etc., the compressive performance of Example 2 of the present invention is improved by more than 18%, and because the protective layer and the sealing layer are integrally formed After vacuuming, a certain space will be formed between the core material and the gas barrier film. Therefore, compared with the existing technology, it has a lighter weight and can reduce the weight by more than 16%. At the same time, because of the fiber cement felt, the insulation The board has high flexural strength, and can improve the flexural strength by more than 12% compared with the existing technologies such as foamed cement, inorganic thermal insulation mortar, and modified cement polystyrene particle coating. Most importantly, the thermal insulation performance of the present invention is greatly improved compared to the prior art, by about 47% or more.

Table 1 lists the experimental data of the relative performance of the composite vacuum insulation board with a thickness of 300 × 300 × 30 mm, which is covered with a protective layer of 10 mm thickness on both sides.

Table 1 Comparison of properties of composite vacuum insulation panels with specifications of 300×300×30mm

The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions that belong to the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, any improvement without departing from the principle of the present invention is also regarded as the protection scope of the present invention.

Claims (8)

1. a kind of composite evacuated heat insulating thermal preserving board of Cement fibre felt, it is characterised in that: the vacuum thermal insulation plate includes core Material and high-intensitive gas barrier film with protective layer, the high-intensitive gas barrier film with protective layer are wrapped in the periphery of core material, And by vacuumizing encapsulation between core material；Protective layer and inside of the high-intensitive gas barrier film with protective layer by outside Sealant be combined；Wherein, protective layer is Cement fibre felt；Sealant by non-woven fabrics, aluminium foil, aluminizer, polyester film, Nylon film, polyethylene film, polyvinyl chloride film, polystyrene film, polyvinylidene chloride, polyvinyl alcohol film, ethylene- Acetate ethylene copolymer film, ethylene-vinyl alcohol copolymer film, polycarbonate film, polyacrylic one or more It is combined；The Cement fibre felt is uniformly impregnated with by mixed slurry in entire fibrofelt, and repressed, drying and maintenance After be made；The mixed slurry includes the component of following mass parts: 40-50 parts of cement, 30-45 parts of quartz sand, and coarse whiting 8- 15 parts, 5-10 parts of rubber powder, 0 .1-3 parts of additive .4 parts of 0 .2-0 of water-reducing agent .8 parts of 0 .4-0 of retarder.

2. vacuum thermal insulation plate according to claim 1, which is characterized in that the cement uses portland cement, aluminium One or more of acid salt cement, sulphate aluminium cement, ferrous aluminate cement, magnesia cement, high strength gypsum press any ratio The mixture of example composition.

3. vacuum thermal insulation plate according to claim 1, which is characterized in that the particle size of the quartz sand is 30-50 mesh or 50-80 mesh, the round and smooth no corner angle of appearance.

4. vacuum thermal insulation plate according to claim 1, which is characterized in that the additive is polypropylene fibre, wine Stone acid, hydroxypropyl methyl cellulose, lignin and polyvinyl alcohol it is one or more combine in any proportion after obtained mixing Object.

5. vacuum thermal insulation plate according to claim 1, which is characterized in that the water-reducing agent is lignosulfonates Or sulfonated melamine compound resin.

6. vacuum thermal insulation plate according to claim 1, which is characterized in that the retarder is monohydric alcohol, polynary Any one in alcohol, polyvinyl alcohol, carboxylate group organic matter, tartaric acid, phosphate or borate.

7. the composite evacuated heat insulating thermal preserving board of Cement fibre felt as described in claim 1, which is characterized in that the fibrofelt is glass One of glass fiber, ceramic fibre, polyester fiber or more than one be combined.

8. a kind of preparation method of the composite evacuated heat insulating thermal preserving board of Cement fibre felt as described in one of claim 1-7, special Sign is, comprising the following steps:

(1) tile the sealant, then takes the mold of specification pressed thereon, divides the mixed slurry of one layer of 1-5mm thickness, It covers mixed slurry by the sealant in mold, forms transition adhesive layer, be then placed in fibrofelt, compacting 8-24 h, drying It is demoulded after 6-24 h, forms the high-intensitive gas barrier film for having protective layer；

(2) the high-intensitive gas barrier film with protective layer described in is wrapped in the periphery of core material, and by vacuumizing between core material Encapsulation forms the composite evacuated heat insulating thermal preserving board of Cement fibre felt with protective layer.