阅读说明：本技术 一种真空绝热板及其制备方法和应用 (Vacuum heat insulation plate and preparation method and application thereof ) 是由 刘东华 闫达 祁小堂 孟超 马芳 胡洋 于 2021-08-18 设计创作，主要内容包括：本发明提供一种真空绝热板及其制备方法和应用,所述制备方法包括如下步骤：(1)将隔热材料和热熔胶混合、压制成型,得到芯材；(2)将步骤(1)得到的芯材置于阻隔包装袋内,抽真空、密封、热处理,得到所述真空绝热板；将热熔胶和隔热材料先压制成型,得到芯材,在热处理过程中,所述芯材中的热熔胶可以将芯材以及芯材与阻隔包装袋粘结固定在一起,避免了传统制备方法中带阻隔包装袋压制芯材成型的步骤,有效降低了所述阻隔包装袋的破损率,提高了产品的合格率以及生产效率,适合大批量工业化生产。(The invention provides a vacuum insulation panel and a preparation method and application thereof, wherein the preparation method comprises the following steps: (1) mixing the heat-insulating material and the hot melt adhesive, and performing compression molding to obtain a core material; (2) placing the core material obtained in the step (1) in a barrier packaging bag, vacuumizing, sealing and carrying out heat treatment to obtain the vacuum insulation panel; the core material is obtained by firstly pressing and molding the hot melt adhesive and the heat insulation material, and the core material and the blocking packaging bag can be bonded and fixed together by the hot melt adhesive in the core material in the heat treatment process, so that the step of pressing and molding the core material by the blocking packaging bag in the traditional preparation method is avoided, the breakage rate of the blocking packaging bag is effectively reduced, the qualification rate and the production efficiency of products are improved, and the method is suitable for large-scale industrial production.)

1. The preparation method of the vacuum insulation panel is characterized by comprising the following steps:

(1) mixing the heat-insulating material and the hot melt adhesive, and performing compression molding to obtain a core material;

(2) and (3) placing the core material obtained in the step (1) in a barrier packaging bag, vacuumizing, sealing and carrying out heat treatment to obtain the vacuum insulation panel.

2. The preparation method according to claim 1, wherein the melting point of the hot melt adhesive in the step (1) is 60-80 ℃;

preferably, the hot melt adhesive comprises EVA hot melt adhesive and/or polyurethane hot melt adhesive.

3. The production method according to claim 1 or 2, wherein the heat insulating material of step (1) comprises a fibrous heat insulating filler and/or a particulate heat insulating filler;

preferably, the fibrous thermal insulation filler comprises any one or a combination of at least two of asbestos fibers, glass fibers or basalt fibers;

preferably, the fiber diameter of the fibrous heat insulation filler is 10-500 μm;

preferably, the fibrous insulating filler has a fiber length of not less than 5 mm;

preferably, the granular insulating filler comprises any one or a combination of at least two of aerogel, expanded perlite, open-cell polyurethane or silica powder;

preferably, the granular insulating filler has a loose bulk density of less than 200kg/m³；

Preferably, the open-cell polyurethane has an open-cell ratio of not less than 90%;

preferably, the specific surface area of the silicon dioxide powder is 100-500 m²/g。

4. The preparation method according to any one of claims 1 to 3, wherein the mass ratio of the hot melt adhesive and the heat insulating filler in the step (1) is 1 (10-20);

preferably, the pressure of the compression molding in the step (1) is 1-3 Mpa.

5. The method according to any one of claims 1 to 4, wherein the heat insulating material of step (1) is a dried heat insulating material;

preferably, the moisture content of the heat insulating material in the step (1) is not more than 0.5%;

preferably, the drying temperature is 180-230 ℃;

preferably, the drying time is 0.5-1 h.

6. The method according to any one of claims 1 to 5, wherein the degree of vacuum in the barrier packaging bag after the evacuation in step (2) is 0.1 to 20 Pa.

7. The method according to any one of claims 1 to 6, wherein the heat treatment in step (2) is carried out for 0.1 to 2 hours;

preferably, the temperature of the heat treatment in the step (2) is 90-110 ℃;

preferably, the method further comprises a step of curing after the heat treatment is finished.

8. The production method according to any one of claims 1 to 7, characterized by comprising the steps of:

(1) mixing a binder with the mass ratio of 1 (10-20) and a heat insulation material with the water content of not more than 0.5% after drying, and performing compression molding under the pressure of 1-3 Mpa to obtain a core material;

(2) and (2) placing the core material obtained in the step (1) into an isolation packaging bag, vacuumizing and sealing to enable the vacuum degree in the isolation packaging bag to be 0.1-20 Pa, performing heat treatment at 90-110 ℃ for 0.1-2 h, and curing to obtain the vacuum insulation panel.

9. A vacuum insulation panel, characterized in that the vacuum insulation panel is prepared by the preparation method according to any one of claims 1 to 8.

10. Use of a vacuum insulation panel according to claim 9 in building construction or household appliances.

Technical Field

The invention belongs to the technical field of heat insulation plates, and particularly relates to a vacuum heat insulation plate and a preparation method and application thereof.

Background

The vacuum heat insulation plate is a novel heat insulation material integrating high efficiency and energy conservation, the heat conductivity coefficient is only 4-8 mW/m.K, the vacuum heat insulation plate is a product with the lowest heat conductivity coefficient at present, but the short service life is a main reason influencing the market acceptance; traditional vacuum insulation panels, along with the extension of time, vacuum reduces gradually, when the urban area heat preservation effect, still can cause bonding failure and droing between panel and the wall body, leads to the outer wall quality problem frequently.

Therefore, research into vacuum insulation panels has also been ongoing. CN102102796A discloses a vacuum insulation panel and a method for manufacturing the same, which includes a high barrier packaging bag and a thermal insulation core material, wherein the thermal insulation core material is placed in a vacuum sealing bag made of the high barrier packaging material, a getter is arranged in the thermal insulation core material, a hole is formed in a panel surface of the vacuum insulation panel, a hole structural member is arranged in the hole, the hole structural member is a tubular section with high barrier property, and the hole structural member and the high barrier packaging bag are welded or bonded together to form the vacuum sealing cavity. The vacuum insulation panel disclosed by the invention is smooth in appearance after being perforated, wrinkles are eliminated, the air permeability of the wrinkles of a high-barrier packaging bag is reduced, and the service life of the vacuum insulation panel is prolonged; the mechanical strength is higher in trompil department after the trompil, can utilize the riveting spare to be connected the installation with vacuum insulation panel and other materials in trompil department for vacuum insulation panel's utilization is more convenient, enlarges its application range. However, the service life of the vacuum insulation panel prepared by the method still needs to be improved, and the preparation method is complicated and is not beneficial to large-scale industrial production.

CN110159873A discloses a vacuum insulation panel and a preparation method thereof, wherein the vacuum insulation panel comprises the following components in percentage by mass: 99-99.8% of superfine glass fiber cotton and 0.2-1.0% of getter. The superfine glass fiber cotton for preparing the vacuum insulation panel is not subjected to wet pulping and hot pressurization, the performance of the fiber is not damaged, the mechanical property of the fiber can be effectively improved, the heat conductivity coefficient is reduced, the production cost can be effectively reduced, and the consumption of natural gas and electric energy is greatly reduced. The vacuum heat insulation plate has the advantages of smooth surface, high strength and low heat conductivity coefficient, and is very suitable for the fields of refrigerators, freezers, cold storage boxes, building wall heat insulation, naval vessels, ships, automobiles, electric water heaters and the like. However, in the use process of the vacuum insulation panel obtained by the method, once the sealing bag is punctured or leaked, the vacuum degree cannot be maintained, the atmospheric pressure effect disappears, fibers and/or particles are easy to deposit at the bottom of the bag under the action of gravity, so that the bag is expanded, the wall body is easy to fall off, and the building quality is seriously affected.

202110648697.3 discloses a vacuum insulation panel and a preparation method and application thereof, wherein a double-component adhesive is added into an intermediate core layer, so that the phenomenon that an expansion bag falls off after the vacuum degree is difficult to maintain is avoided, and the service life of the vacuum insulation panel can be greatly prolonged; however, in the method, the adhesive is added into the powder in the processing process, the powder is mixed and then is filled into a barrier packaging bag, and then the barrier packaging bag is subjected to high-pressure compression molding and then is vacuumized, so that the barrier packaging bag is easily damaged, the vacuum degree is influenced, and the overlong vacuumizing time in the production process is caused due to the high content of small molecular substances in the double-component adhesive, so that the production efficiency is influenced, and the method is not favorable for large-scale industrial production.

Therefore, it is an urgent technical problem in the art to develop a method for preparing a vacuum insulation panel capable of reducing damage to a barrier packaging bag and improving production efficiency.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a vacuum insulation panel and a preparation method and application thereof, wherein the preparation method comprises the following steps: mixing the heat-insulating material and the hot melt adhesive, and performing compression molding to obtain a core material; placing the core material in a barrier packaging bag, vacuumizing, sealing and carrying out heat treatment to obtain the vacuum insulation panel; the preparation method avoids the process of putting the heat insulation material into the barrier packaging bag and then pressing and molding the heat insulation material, thereby effectively reducing the loss rate of the barrier packaging bag in the production process, improving the production efficiency and having important research significance.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the present invention provides a method for preparing a vacuum insulation panel, the method comprising the steps of:

(1) mixing the heat-insulating material and the hot melt adhesive, and performing compression molding to obtain a core material;

(2) and (3) placing the core material obtained in the step (1) in a barrier packaging bag, vacuumizing, sealing and carrying out heat treatment to obtain the vacuum insulation panel.

The preparation method of the vacuum insulation panel provided by the invention comprises the steps of firstly mixing a heat insulation material and a hot melt adhesive, wherein the hot melt adhesive is colloidal particles or powder with a lower melting point, is in a solid state at normal temperature, and can be mixed with the heat insulation material to be pressed and formed together to obtain a core material; then placing the core material after compression molding into a barrier packaging bag, vacuumizing and sealing, carrying out heat treatment to enable the hot melt adhesive to be molten into low-viscosity liquid, connecting the core material with the barrier packaging bag to play a role in shaping and protecting, and then placing the core material into room temperature for curing to obtain the vacuum insulation panel; the core material is obtained by adopting hot melt adhesive and heat insulation materials to be pressed and formed firstly, and in the heat treatment process, the core material and the blocking packaging bag can be bonded and fixed together by the hot melt adhesive in the core material, so that the step of pressing the core material into the blocking packaging bag in the traditional preparation method is changed, the breakage rate of the blocking packaging bag is effectively reduced, and the qualification rate and the production efficiency of products are improved; and the whole preparation process of the preparation method is simple in process, is close to the equipment used for preparing the existing vacuum insulation panel, is suitable for large-scale industrial production, and has important research value.

Preferably, the melting point of the hot melt adhesive in step (1) is 60-80 ℃, such as 62 ℃, 64 ℃, 66 ℃, 68 ℃, 70 ℃, 72 ℃, 74 ℃, 76 ℃ or 78 ℃, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not exhaustive of the specific values included in the range.

Preferably, the hot melt adhesive comprises EVA hot melt adhesive and/or polyurethane hot melt adhesive.

Preferably, the heat insulating material of step (1) comprises a fibrous heat insulating filler and/or a particulate heat insulating filler.

Preferably, the fibrous insulating filler comprises any one of asbestos fibers, glass fibers or basalt fibers, or a combination of at least two of them.

Preferably, the fibrous insulating filler has a fiber diameter of 10 to 500 μm, such as 10 μm, 20 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm or 500 μm, and specific values therebetween, which are not exhaustive for reasons of space and brevity.

Preferably, the fibrous insulating filler has a fiber length of not less than 5mm, such as 5mm, 10mm, 20mm, 50mm, 100mm, 200mm, 500mm, 1000mm, 2000mm, 5000mm or continuous fibers, and specific values therebetween, not to mention space and for the sake of brevity, the invention is not exhaustive of the specific values included in the ranges.

Preferably, the particulate insulating filler comprises any one of aerogel, expanded perlite, open-cell polyurethane or silica powder or a combination of at least two thereof.

Preferably, the granular insulating filler has a loose bulk density of less than 200kg/m³For example 180kg/m³、160kg/m³、140kg/m³、120kg/m³、100kg/m³、80kg/m³、60kg/m³、40kg/m³Or 20kg/m³And the specific values between the foregoing, are not intended to be exhaustive or to limit the invention to the precise values encompassed within the scope, for reasons of brevity and clarity.

Preferably, the open-cell polyurethane has an open-cell content of no less than 90%, such as 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100%, and specific values therebetween, for brevity and clarity, are not intended to be exhaustive or to include specific values within the stated ranges.

Preferably, the specific surface area of the silicon dioxide powder is 100-500 m²G, e.g. 130m²/g、160m²/g、190m²/g、210m²/g、240m²/g、270m²/g、300m²/g、330m²/g、360m²/g、390m²/g、420m²/g、450m²(iv)/g or 480m²The present invention is not intended to be exhaustive of the specific point values included in the ranges, limited to space and for the sake of brevity, as well as the specific point values between the point values recited above.

Preferably, the mass ratio of the hot melt adhesive to the heat insulating filler in the step (1) is 1 (10-20), such as 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1: 16. 1:17, 1:18, 1:19, 1:20, etc.

According to the preferred technical scheme, the comprehensive performance of the vacuum insulation panel is most excellent when the mass ratio of the hot melt adhesive to the heat insulation filler is 1 (10-20); on one hand, if the using amount of the hot melt adhesive is too large, the heat value of the vacuum insulation panel is too high; on the other hand, if the amount of the hot melt adhesive is too low, the adhesive area is too small, the adhesive strength is low, and the adhesive is liable to crack, resulting in a high breakage rate for 5 years.

Preferably, the pressure of the press forming in the step (1) is 1 to 3Mpa, such as 1.2Mpa, 1.4Mpa, 1.6Mpa, 1.8Mpa, 2Mpa, 2.2Mpa, 2.4Mpa, 2.6Mpa or 2.8Mpa, and the specific values therebetween are not exhaustive, but the invention is not limited to the specific values included in the range for brevity and conciseness.

Preferably, the heat insulating material in the step (1) is a dried heat insulating material.

Preferably, the drying temperature is 180-230 ℃, such as 180 ℃, 185 ℃, 190 ℃, 195 ℃, 200 ℃, 205 ℃, 210 ℃, 215 ℃, 220 ℃, 225 ℃ or 230 ℃, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not exhaustive of the specific values included in the range.

Preferably, the drying time is 0.5-1 h, such as 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, or 1h, and the specific values therebetween are not exhaustive, and for brevity and clarity, the invention is not intended to be limited to the specific values included in the ranges.

Preferably, the moisture content of the heat insulating material of step (1) is not greater than 0.5%, such as 0.45%, 0.4%, 0.35%, 0.3%, 0.25%, 0.2%, 0.15%, 0.1%, or 0.05%, and specific values therebetween, not to limit the disclosure and for brevity, the invention is not exhaustive of the specific values included in the ranges.

Preferably, the vacuum degree in the barrier packaging bag after the vacuum sealing in the step (2) is 0.1 to 20Pa, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not exhaustive.

Preferably, the heat treatment time in the step (2) is 0.1 to 2 hours, such as 0.1 hour, 0.5 hour, 1 hour, 1.3 hours, 1.5 hours, 1.7 hours or 2 hours, and specific values therebetween, limited to space and for brevity, the invention is not exhaustive, and further preferably 0.5 to 1.5 hours.

Preferably, the temperature of the heat treatment in the step (2) is 90-110 ℃, for example 90 ℃, 94 ℃, 98 ℃, 102 ℃, 106 ℃ or 110 ℃, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not exhaustive of the specific values included in the range.

Preferably, the method further comprises a step of curing after the heat treatment is finished.

As a preferred technical scheme, the preparation method comprises the following steps:

(1) mixing a binder with the mass ratio of 1 (10-20) and a heat insulation material with the water content of not more than 0.5% after drying, and performing compression molding under the pressure of 1-3 Mpa to obtain a core material;

(2) and (2) placing the core material obtained in the step (1) into an isolation packaging bag, vacuumizing and sealing to enable the vacuum degree in the isolation packaging bag to be 0.1-20 Pa, performing heat treatment at 90-110 ℃ for 0.1-2 h, and curing to obtain the vacuum insulation panel.

In a second aspect, the present invention provides a vacuum insulation panel prepared by the preparation method according to the first aspect.

Fig. 1 shows a schematic cross-sectional structure of a vacuum insulation panel according to the present invention, wherein 1 represents a barrier packaging bag, and 2 represents a cured core material.

In a third aspect, the present invention provides a use of the vacuum insulation panel according to the second aspect in building construction or household appliances.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the preparation method of the vacuum insulation panel, the core material is obtained by mixing and co-pressing the heat insulation material and the hot melt adhesive; placing the core material in a barrier packaging bag, vacuumizing and sealing, and performing heat treatment to connect the core material and the barrier packaging bag to obtain the vacuum insulation panel; the preparation method avoids the process of filling the heat-insulating material into the barrier package, vacuumizing the barrier package and then pressing and molding the heat-insulating material by using the oil press, and reduces the loss rate of the barrier package bag in the production process, the heat conductivity coefficient of the vacuum heat-collecting plate prepared by the preparation method provided by the invention is 4-9 mW/m.K in one day, the heat conductivity coefficient of the vacuum heat-collecting plate prepared by the preparation method provided by the invention is 5-11 mW/m.K in five years, and the heat conductivity coefficient after breakage is 33-36 mW/m.K; the breakage rate of the product in one month is 0%, the breakage rate of the product in five years is 0.1-0.6%, the qualification rate of the product is 85-95%, and the qualification rate is improved by nearly 20%;

(2) according to the preparation method of the vacuum insulation panel, the production flow and the process takt are optimized, the production efficiency is improved, and the production time of the vacuum insulation panel is shortened to 3-4 hours from about 15-27 hours; (ii) a The production period is 3-4 h; compared with comparative example 1, the energy consumption is 84-91%.

(3) According to the preparation method of the vacuum insulation panel, the core material and the barrier packaging bag are connected by the hot melt adhesive, and compared with a double-component adhesive used in the prior art, which has the advantages that due to the fact that a large number of small molecular materials exist in the adhesive, a high vacuum degree can be achieved for a long time, and the energy consumption is high; the hot melt adhesive adopted by the invention has few micromolecule materials, can reach higher vacuum degree in a shorter time, and greatly reduces the energy consumption of the vacuum unit, so that the preparation method can effectively reduce the production energy consumption, although the energy consumption can be improved in the heat treatment process, the energy consumption is slightly increased at the temperature of 90-110 ℃, the comprehensive conversion is realized, and the overall energy consumption can be reduced by 10-15%.

(4) The preparation method of the vacuum insulation panel provided by the invention is the same as the equipment used in the prior art, only one drying room or oven is needed, and the preparation method is suitable for large-scale industrial development and has important research value.

Drawings

Fig. 1 is a schematic cross-sectional view of a vacuum insulation panel according to the present invention, wherein the vacuum insulation panel includes a 1-barrier packaging bag and a 2-core material.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.

Example 1

A preparation method of a vacuum insulation panel comprises the following steps:

(1) drying the glass fiber mat and the silicon dioxide powder at 180 ℃ for 1h to obtain the glass fiber mat with the water content of 0.4 percent and the silicon dioxide powder; mixing 70 parts by weight of dried glass fiber felt (50 μm in diameter, Weifang Sanyu New Material Co., Ltd.), 30 parts by weight of dried silicon dioxide powder (Nanjing Baker New Material Co., Ltd.) and 5 parts by weight of hot melt adhesive (EVA type hot melt adhesive, melting point 60 ℃) to be placed under an oil press and pressed under the pressure of 2Mpa for molding, and then cutting into a core material of 400 × 600 mm;

(2) and (2) placing the core material obtained in the step (1) into an isolation packaging bag, vacuumizing to enable the vacuum degree to be 20Pa, carrying out heat sealing, carrying out heat treatment for 0.1h in an oven at the temperature of 110 ℃, cooling and curing to obtain the vacuum insulation board.

Example 2

A preparation method of a vacuum insulation panel comprises the following steps:

(1) drying the glass fiber mat and the silicon dioxide powder at 230 ℃ for 0.5h to obtain the glass fiber mat with the water content of 0.5 percent and the silicon dioxide powder; mixing 70 parts by weight of dried glass fiber felt (50 μm in diameter, Weifang Sanyu New Material Co., Ltd.), 30 parts by weight of dried silicon dioxide powder (Nanjing Baker New Material Co., Ltd.) and 10 parts by weight of hot melt adhesive (TPU type hot melt adhesive, melting point 68 ℃) to be placed under an oil press to be pressed and molded under the pressure of 2Mpa, and then cutting into 400 × 600mm core materials;

(2) and (2) placing the core material obtained in the step (1) into a barrier packaging bag, vacuumizing to enable the vacuum degree to be 0.1Pa, carrying out heat sealing, and carrying out heat treatment for 2 hours in an oven at the temperature of 90 ℃ to obtain the vacuum insulation board.

Example 3

A preparation method of a vacuum insulation panel comprises the following steps:

(1) drying the glass fiber mat and the silicon dioxide powder at 190 ℃ for 1h to obtain the glass fiber mat with the water content of 0.4 percent and the silicon dioxide powder; mixing 70 parts by weight of dried glass fiber felt (50 μm in diameter, Weifang Sanyu New Material Co., Ltd.), 30 parts by weight of dried silicon dioxide powder (Nanjing Baker New Material Co., Ltd.) and 7.5 parts by weight of hot melt adhesive (TPU type hot melt adhesive, melting point 68 ℃) to be placed under an oil press to be pressed and molded under the pressure of 3Mpa, and then cutting into core materials of 400 x 600 mm;

(2) and (2) placing the core material obtained in the step (1) into an isolation packaging bag, vacuumizing to enable the vacuum degree to be 10Pa, carrying out heat sealing, and carrying out heat treatment for 1h in an oven at the temperature of 100 ℃ to obtain the vacuum insulation board.

Example 4

A method for manufacturing a vacuum insulation panel, which is different from example 1 only in that the amount of hot melt adhesive used in step (1) is 10 parts by weight, and the other conditions and steps are the same as those of example 1.

Example 5

A method for manufacturing a vacuum insulation panel, which is different from example 1 only in that 15 parts by weight of hot melt adhesive is used in step (1), and the other conditions and steps are the same as in example 1.

Example 6

A method for manufacturing a vacuum insulation panel, which is different from example 1 only in that 4 parts by weight of hot melt adhesive is used in step (1), and the other conditions and steps are the same as in example 1.

Comparative example 1

A preparation method of a vacuum insulation panel comprises the following steps:

(1) drying the glass fiber mat and the silicon dioxide powder at 150 ℃ for 2 hours to obtain the glass fiber mat with the water content of 0.5 percent and the silicon dioxide powder; mixing 70 parts by weight of dried glass fiber felt (50 μm in diameter, Weifang Sanyu New Material Co., Ltd.), 30 parts by weight of dried silica powder (Nanjing Baker New Material Co., Ltd.) and 10 parts by weight of binder (epoxy resin binder, Nanjing star synthetic Material Co., Ltd.) to obtain a core material;

(2) and (2) putting the core material obtained in the step (1) into a barrier packaging bag, pressing and molding by using an oil press, wherein the pressure of the oil press is 2Mpa, vacuumizing to ensure that the vacuum degree is 20Pa, and curing for 24 hours at room temperature after heat sealing to obtain the vacuum insulation panel.

Comparative example 2

A preparation method of a vacuum insulation panel comprises the following steps:

(1) drying the glass fiber mat and the silicon dioxide powder at 180 ℃ for 1h to obtain the glass fiber mat with the water content of 0.4 percent and the silicon dioxide powder; mixing 70 parts by weight of dried glass fiber felt (50 μm in diameter, Weifang Sanyu New Material Co., Ltd.), 30 parts by weight of dried silica powder (Nanjing Baker New Material Co., Ltd.) and 5 parts by weight of binder (epoxy resin binder, Nanjing star synthetic Material Co., Ltd.) to obtain a core material;

(2) and (2) putting the core material obtained in the step (1) into a barrier packaging bag, pressing and molding by using an oil press, wherein the pressure of the oil press is 2Mpa, vacuumizing to ensure that the vacuum degree is 0.1Pa, and curing for 12 hours at room temperature after heat sealing to obtain the vacuum insulation panel.

Comparative example 3

A vacuum insulation panel, which is different from the vacuum insulation panel in example 1 only in that no hot melt adhesive is added in step (1), and other conditions and steps are the same as those of example 1.

Comparative example 4

A vacuum insulation panel, which is different from the vacuum insulation panel in example 2 only in that no hot melt adhesive is added in step (1), and other conditions and steps are the same as those of example 1.

And (3) performance testing:

(1) coefficient of thermal conductivity: testing according to the GB/T10294-;

(2) breakage rate: taking 1000 samples to visually measure the number of damages;

(3) the percent of pass is: the quantity of qualified products in 1000 products is calculated;

(4) the production cycle is as follows: recording the time required by the whole preparation process;

(5) energy consumption: the energy consumption of the other examples and comparative examples was calculated based on 100% of the energy consumed in comparative example 1.

(6) Heat value: testing is carried out according to the GB/T14402-2007 standard of the determination of combustion performance and combustion heat value of building materials and products;

the vacuum insulation panels obtained in examples 1 to 6 and comparative examples 1 to 4 were tested according to the above test method, and the test results are shown in tables 1 and 2:

TABLE 1

TABLE 2

As can be seen from table 1: the vacuum insulation panel obtained by the preparation method provided by the invention has lower heat conductivity coefficient and breakage rate, and can keep the original shape even after being broken, so that the heat conductivity coefficient is maintained at a lower level; as can be seen from the table 2, the vacuum insulation panel prepared by the preparation method provided by the invention has the advantages of high qualification rate, short production period and low energy consumption.

Specifically, the heat conductivity of the vacuum insulation panels provided in examples 1 to 6 is 4 to 9mW/m · K in one day; the heat conductivity coefficient of the material is 5-11 mW/m.K for five years; the thermal conductivity coefficient after damage is 33-36 mW/m.K; the damage rate of the glass is 0% in one month, and the damage rate of the glass is 0.1-0.6% in five years; the qualification rate is 85-95%; the production period is 3-4 h; compared with comparative example 1, the energy consumption is 84-91%.

Comparing example 1 with comparative example 1, and comparing example 2 with comparative example 2, it can be seen that the difference between the thermal conductivity and the breakage rate of the vacuum insulation panels obtained in comparative examples 1 to 2 is not large compared with those of the vacuum insulation panels obtained in examples 1 to 2; however, the yield of the vacuum insulation panels obtained in the examples 1-2 is improved from about 70% to about 90% of that of the comparative examples 1-2, and is improved by nearly 20%; the production period is shortened from 15-26 h to 3-4 h, and the energy consumption is reduced by about 10-15%, which shows that the preparation method provided by the invention can improve the production efficiency and obtain better benefits.

Comparing example 1 with comparative example 3, and comparing example 2 with comparative example 4, it can be found that the thermal conductivity of the vacuum insulation panels provided in comparative examples 3 and 4 used for one day is similar to that of examples 1-2, but because no binder is added, the thermal conductivity after five years is greatly improved, and the thermal conductivity after breakage is serious and is difficult to test; and the breakage rate of one month is 0%, but the breakage rate after five years is as high as 2%.

Further comparing examples 1 and 5 to 6, it can be seen that the thermal conductivity after five years and after breakage is slightly increased by adding too much binder (example 5), and the breakage rate after five years is improved by adding too little binder (example 6).

The applicant states that the present invention is a vacuum insulation panel and a method for manufacturing and using the same through the above embodiments, but the present invention is not limited to the above process steps, i.e. it does not mean that the present invention must be implemented by relying on the above process steps. It will be apparent to those skilled in the art that any modification of the present invention, equivalent substitutions of selected materials and additions of auxiliary components, selection of specific modes and the like, which are within the scope and disclosure of the present invention, are contemplated by the present invention.