Heat insulation additive, preparation method and application of heat insulation additive in low-heat-absorption PVC (polyvinyl chloride) film and floor

Abstract

The invention discloses a heat insulation additive, a preparation method and application of the heat insulation additive in low-heat-absorption PVC (polyvinyl chloride) films and floors, the heat insulation additive comprises the following raw materials in parts by weight: 10-50 parts of a heat insulation material, 40-70 parts of an organic solvent, 2-10 parts of a dispersing agent and 0.1-1.2 parts of a silane coupling agent, and the heat insulation material, the organic solvent and the dispersing agent are mixed, ground and subjected to ultrasonic treatment; and then adding a silane coupling agent, heating and mixing. 0.1-1.5 parts by weight of the heat insulation additive is added into the PVC film, ultraviolet light can be effectively absorbed, infrared light can be effectively shielded, preferably, the ultraviolet light rejection rate of the low-heat-absorption PVC film prepared by adding 0.5 part by weight of the heat insulation additive is 98%, the maximum infrared light rejection rate is 90%, the visible light transmittance is 70%, and the minimum shading coefficient is 47%. The high-temperature-resistant floor board has good heat insulation performance and heat stability, the floor board made of the high-temperature-resistant floor board does not warp or become brittle in a high-temperature environment, and the service life of the floor board is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of PVC film preparation, and more particularly to a preparation method of low-heat-absorption PVC film and application thereof. BACKGROUND

[0002] In recent years, energy saving and emission reduction have become a global concern. In modern buildings, a large number of thin and transparent external materials such as glass and plastic are used. These materials inevitably cause the sunlight to enter the indoor, resulting in the indoor temperature rising. At present, most buildings use heat-insulating glass and heat-insulating and cooling plastic light boards for heat insulation and energy saving. The floor is also a part of heat absorption, and it is important to keep the floor temperature within the comfortable temperature range of the human body to achieve the effect of heat insulation and energy saving.

[0003] PVC floor is a floor material made of polyvinyl chloride resin as the main raw material, which has good environmental protection performance, decoration effect and use function, and is widely used in the building decoration industry. The conventional PVC floor will accelerate the aging and discoloration of the material under the sunlight or high temperature environment for a long time, and will also affect the service life of the product. Therefore, in order to ensure that the PVC floor can be used for a long time and stably, it is urgent to develop a PVC floor with heat insulation and energy saving and long service life. An effective way to achieve the heat insulation effect is to use a material that can effectively block part of the infrared light of the solar heat effect. For applications in the field of glass doors and windows, it is also necessary to ensure the visible light transmittance of the material to ensure its transmittance performance. At present, the materials that have blocking or shielding performance for infrared light include hexaboride, antimony tin oxide, indium tin oxide, zinc aluminum oxide, tungsten bronze, etc., which have been widely used in transparent heat insulation, liquid crystal display, solar cell, anti-static coating and many other fields. These materials not only have good infrared shielding performance, but also have good visible light transmittance. In the prior art, there are reports on the preparation of heat-insulating PVC film by adding these materials, and then coating or pasting on the glass door and window.

[0004] For example, Feng Yongting, Zhou Miao, Tang Guofeng, etc. published an article "Cesium tungsten bronze modified PVC film heat insulation and infrared barrier performance" in "Engineering Plastics Application", which discloses that the formula of cesium tungsten bronze: acrylate copolymer: dispersant is 20:74-79:1-6 by mass, then the tungsten bronze is modified by using a ball mill for mixing and grinding, then the HM-828 is mixed with the ground tungsten bronze, and then the PVC and the thermal stabilizer 16-1HM-W303 are added and uniformly mixed, and then the melt blending is carried out to prepare a film sample with a thickness of 150 μm; the infrared barrier rate of the PVC film of the invention is 50%-60%, the visible light transmittance is 68.5%, and the ultraviolet light barrier rate is not mentioned, and the type and amount of the dispersant in the invention have a very important influence on the stability of the tungsten bronze, which easily causes the tungsten bronze slurry to stratify, which is not conducive to the formation of the film, resulting in a decrease in the infrared barrier performance.

[0005] For example, Chinese patent CN104693646A discloses a transparent plasticized PVC functional film, which is made of the following raw materials in mass ratio: PVC resin 100 parts, plasticizer 60-70 parts, thermal stabilizer 1.2-1.8 parts, ultraviolet light absorber 0.4-0.6 parts, pigment master batch 1.2-6.0 parts, surface modified metal oxide 0.5-2.0 parts, lubricant 0.5-0.8 parts; wherein the surface modified metal oxide is one or more of indium tin oxide or antimony tin oxide modified by a coupling agent; the surface modified metal oxide modification is that the indium tin oxide or antimony tin oxide is first dried at 120°C for 1 h, then added to a high-speed mixer at a temperature of 60°C at a mass ratio of indium tin oxide or antimony tin oxide: silane coupling agent KH-550: anhydrous ethanol = 100:1:2, low-speed stirring for 3-5 min, and when the temperature is raised to 80°C, high-speed stirring is started, and after 8-10 min, modified indium tin oxide or antimony tin oxide is prepared; the transparent plasticized functional film has an average inhibition rate of ultraviolet light of up to 99.3%, an average transmittance of blue light of 58.6%, an average transmittance of visible light of 77.8%, and an average transmittance of near-infrared light of 43.2%, and the invention utilizes the absorption of near-infrared light by indium tin oxide or antimony tin oxide to achieve cooling and heat insulation effect, and also utilizes the ultraviolet light absorber to absorb ultraviolet light.

[0006] For example, Chinese patent CN101514083A discloses a method for preparing a low-e film that can be used for laminated glass. The method involves using a PVC, PET, PP, or BOPP film as a carrier, and applying a surface treatment solution (1-5% concentration) of a treatment agent to the film surface in a solution of aqueous resin, acetone, butyl acetate, ethanol, or a mixture thereof; or hot-pressing at a temperature of approximately 50-120°C and a pressure of approximately 1-3 kg; or modifying the film surface using corona treatment or a combination of the above methods; and then coating the film with a coating made from purchased or self-made indium tin oxide or tin oxide or a combination thereof, along with aqueous acrylic resin, aqueous polyurethane resin, or aqueous epoxy resin, to form a heat-insulating and reflective layer that adheres firmly to the film, thus achieving the heat insulation function.

[0007] For example, in an article titled "Preparation of Cesium Tungsten Bronze Nanopowder and Its Application in Transparent Heat Insulation Coatings" published in *Shanghai Coatings*, Gao Jianbin, Xu Guodong, and Zhang Jianrong mentioned that cesium tungsten bronze nanopowder was prepared using tungstic acid and cesium sulfate as raw materials and sorbitol as solvent via a solvothermal process. The prepared cesium tungsten bronze nanopowder, deionized water, dispersant, and sodium hydroxide or nitric acid were then stirred evenly and ground and dispersed in a sand mill to obtain a Cesium tungsten bronze nanopowder aqueous slurry with a D50 of 55.9 nm and a solid content of 30%. This cesium tungsten bronze nanopowder was then added to an acrylic emulsion and coated onto a glass substrate to form a transparent infrared absorbing film with a dry film thickness of approximately 5 μm. The transmittance at 950 nm was measured to be 9.2%, and the visible light transmittance at 550 nm was 71%.

[0008] In summary, infrared light generates the most heat in the solar spectrum. Therefore, heat-insulating films are generally made by adding metal oxides such as antimony tin oxide, indium tin oxide, and tungsten bronze, which have infrared shielding properties. This achieves the heat insulation function of the film without affecting light transmission and appearance. Because these heat-insulating materials are prone to precipitation, they need to be modified to ensure their dispersion stability. Current technologies generally use dispersants or binders and organic solvents or acids to improve the dispersibility, stability, and compatibility with other materials of these heat-insulating materials. However, the method of modifying and grafting these heat-insulating materials using both dispersants and binders is not used simultaneously. This would allow the film prepared by adding these heat-insulating materials to block both ultraviolet and infrared light and be applied to flooring to achieve heat insulation, energy saving, and durability. Summary of the Invention

[0009] In view of the above, the present invention provides a heat insulation additive, a preparation method, and its application in low heat absorption PVC film and flooring. The additive is obtained by modifying and grafting a heat insulation material with a stable dispersion, small particle size, and uniform distribution using a dispersant, organic solvent, and binder. This improves its compatibility with other additives, resulting in a PVC film with excellent heat insulation performance and thermal stability. Applying this PVC film to flooring improves the stability of the flooring under high-temperature environments and reduces warping.

[0010] The present invention provides a heat insulation additive comprising the following raw materials in parts by weight: 10-50 parts of heat insulation material, 40-70 parts of organic solvent, 2-10 parts of dispersant, and 0.1-1.2 parts of silane coupling agent.

[0011] The heat insulation material includes one or more of nano-near-infrared absorbing powder and nano-mid-far-infrared reflective powder, which are one or more of nano-tin oxide, nano-antimony tin oxide, lanthanum hexaboride, titanium dioxide, and cesium tungsten bronze, with a particle size of 10-100 nm.

[0012] The organic solvent is one or any combination of cyclohexanone, toluene, methyl isobutyl ketone and isopropanol.

[0013] The dispersant is any one of polyacrylate, ethylene-acrylic acid copolymer, or calcium stearate.

[0014] The silane coupling agent is any one of KH-550, KH-560, KH-570, and KH-792.

[0015] The particle size of the heat insulation additive is 50–120 nm.

[0016] The present invention provides a method for preparing a heat-insulating additive, comprising the following steps: (1) Weigh the following raw materials in the indicated weight proportions: 10-50 parts of heat insulation material, 40-70 parts of organic solvent, 2-10 parts of dispersant, and 0.1-1.2 parts of silane coupling agent; (2) First, add the heat insulation material to the ball mill for grinding at a speed of 100-500 r / min for 1-6 h; then add the organic solvent and dispersant to the ball mill for grinding for 1-3 h to obtain the grinding material. (3) The grinding material is ultrasonicated for 20 min to 60 min to obtain the heat insulation slurry; (4) Add silane coupling agent to the heat insulation slurry, keep it in an oil bath at 50-80°C, and stir for 8-16 hours to obtain the heat insulation additive.

[0017] The thermal insulation material in this invention has hydroxyl groups as the main functional groups on its surface, thus exhibiting strong hydrophilicity and difficulty in uniformly dispersing in organic solvents such as ketones. In order to uniformly disperse it in ketone solvents, it needs to be modified and grafted. (1) First, add the heat insulation material to the ball mill for grinding. Use the mechanical force of the ball mill to activate the surface of the powder, which increases the surface active points of the particles to a certain extent, thus facilitating the adsorption of active groups. (2) By selecting appropriate dispersants and their dosage, the surface of the thermal insulation material is modified and grafted: Adding appropriate dispersants is beneficial to the adsorption of active groups and produces a coating effect on the surface of the thermal insulation material, enhancing the suspension effect, improving the stability of the slurry, keeping the thermal insulation material in a stable dispersion state, and forming a dispersion with small particle size and uniform distribution. (3) Finally, the silane coupling agent is modified. The functional groups on the silane coupling agent are grafted with the hydroxyl groups on the surface of the nanoparticles to form chemical bonds at the interface between the two phases, which improves the ability of the particles to adhere to the interface and also improves the force transmission effect at the interface, providing a plastic interface layer, eliminating the residual stress at the interface, and further reducing the sedimentation rate of the nanoparticles on the basis of the dispersant modification.

[0018] The thermal insulation material has a particle size of 10–100 nm. Nanoscale thermal insulation materials are selectively transparent, allowing visible light to pass through while blocking most near-infrared rays. Furthermore, the reduced size of nanocrystalline particles enhances the material's transparency and thermal insulation performance. The thermal insulation additive has a particle size of 50 nm–120 nm. Ball-milled thermal insulation material particles have a smaller relative surface area, increased surface atomic bonding ability, and stronger interatomic attraction, resulting in higher surface energy and strong adsorption. The addition of silane coupling agents acts as a "passivator," adsorbing other molecules onto the particle surface, thus ensuring uniform dispersion and reducing sedimentation.

[0019] Furthermore, the heat-insulating additive of the present invention is applied to low heat-absorbing PVC film, and the low heat-absorbing PVC film prepared therefrom comprises the following raw materials in parts by weight: 100 parts of polyvinyl chloride, 20-30 parts of plasticizer, 1-3 parts of stabilizer, 0.1-1.5 parts of processing aid, and 0.1-1.5 parts of heat-insulating additive.

[0020] By adding heat-insulating additives to PVC resin and processing them through a series of methods, a film with good heat-insulating properties can be prepared.

[0021] The plasticizers include any one of dioctyl terephthalate, epoxidized soybean oil, and dibutyl phthalate.

[0022] The stabilizer includes either barium-zinc stabilizer or calcium-zinc stabilizer.

[0023] The processing aid is a mixture of stearic acid and polyethylene wax in a weight ratio of 1:1 to 1:3.

[0024] The film thickness ranges from 0.1 mm to 1 mm.

[0025] The preparation method of low heat absorption PVC film includes the following steps: (1) Weigh the following raw materials in the following proportions by weight: 100 parts of polyvinyl chloride, 20-30 parts of plasticizer, 1-3 parts of stabilizer, 0.1-1.5 parts of processing aid, and 0.1-1.5 parts of heat insulation additive; (2) Place the above raw materials into a high-speed mixer in sequence, stir for 5 to 10 minutes, mix the raw materials evenly at 50 to 80°C, and then perform open milling at 175 to 190°C for 2 to 5 minutes. (3) The material after open milling is fed into a calender. The entire substrate is calendered by a mixed roller at a temperature of 170-190°C to form a sheet. Finally, the obtained sheet is pulled out by a cooling roller to produce a low heat absorption PVC film. The low heat absorption PVC film is applied to the low heat absorption PVC flooring. The low heat absorption PVC flooring is prepared by the following method: the low heat absorption PVC film is attached to the surface of the PVC flooring sheet with the colored film, and after the sheet cools, the sheet is cut, heated, cooled, and then slit, grooved, trimmed and chamfered to obtain the low heat absorption flooring.

[0026] This invention utilizes dispersants and silane coupling agents to modify and graft thermal insulation materials, resulting in more stable and uniform dispersion of the material in organic solvents. The prepared thermal insulation additive exhibits advantages such as good dispersibility, good stability, small particle size, and uniform distribution. The PVC film with the added thermal insulation additive also possesses excellent thermal insulation performance and thermal stability, effectively blocking ultraviolet and infrared light while maintaining good visible light transmittance, achieving a superior thermal insulation effect. Furthermore, the PVC film is applied to flooring to create low-heat-absorbing PVC flooring with thermal insulation and energy efficiency. Compared to traditional PVC flooring, low-heat-absorbing PVC flooring demonstrates better stability under high-temperature environments and maintains good appearance and performance even after prolonged use. It has broad application prospects in the building decoration industry, providing a superior flooring material option with significant market application value and social benefits. Detailed Implementation

[0027] The embodiments of this application will now be described in more detail. This application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to provide a more thorough and complete understanding of the application. It should be understood that the embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0028] The term "comprising" as used in this application is an open-ended inclusion, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment". Definitions of other terms will be given in the description below.

[0029] The embodiments and comparative examples of the present invention are implemented according to the following technical solutions, specifically including: 1. The preparation of the heat insulation additive is as follows: (1) Weigh the following raw materials in the indicated weight proportions: 10-50 parts of heat insulation material, 40-70 parts of organic solvent, 2-10 parts of dispersant, and 0.1-1.2 parts of silane coupling agent; (2) First, add the heat insulation material to the ball mill for grinding at a speed of 100-500 r / min for 1-6 h; then add the organic solvent and dispersant to the ball mill for grinding for 1-3 h to obtain the grinding material. (3) The grinding material is ultrasonicated for 20 min to 60 min to obtain the heat insulation slurry; (4) Add silane coupling agent to the heat insulation slurry, keep it in an oil bath at 50-80°C, and stir for 8-16 hours to obtain the heat insulation additive.

[0030] 2. The preparation of low heat absorption PVC film, the specific steps are as follows: (1) Weigh the following raw materials in the following proportions by weight: 100 parts of polyvinyl chloride, 20-30 parts of plasticizer, 1-3 parts of stabilizer, 0.1-1.5 parts of processing aid, and 0.1-1.5 parts of heat insulation additive; (2) Place the above raw materials into a high-speed mixer in sequence, stir for 5 to 10 minutes, mix the raw materials evenly at 50 to 80°C, and then perform open milling at 175 to 190°C for 2 to 5 minutes. (3) The material after open milling is fed into a calender. The entire substrate is calendered by a mixed roller at a temperature of 170-190°C to form a sheet. Finally, the obtained sheet is pulled out by a cooling roller to produce a low heat absorption PVC film.

[0031] 3. The specific steps for preparing low heat absorption PVC flooring are as follows: (1) Put 100 parts of PVC resin, 300 parts of heavy calcium carbonate, 10 parts of stabilizer, 1.25 parts of polyethylene wax, 1.2 parts of stearic acid, and 3 parts of processing aid into a high-speed mixer and mix them at a temperature of 120°C for 15 minutes. Then, cool the raw materials mixed in the mixer at a temperature of 60°C. (2) The cooled raw material is put into a twin-screw extruder for heating and extrusion into sheet material. The sheet material is then subjected to thickness determination by a four-roll calender. (3) Apply the colored film and the PVC film to the surface of the sheet material after the thickness is fixed, and cut the sheet material after it cools down. (4) The cut sheet is heated by hot water and then cooled in cold water. The temperature of the hot water is 80°C and the temperature of the cold water is 10°C. (5) The cooled sheet is cut, grooved, trimmed and chamfered to form a low heat absorption floor.

[0032] The specific preparation conditions of the heat insulation additives in this invention are shown in Table 1. In Examples 1 to 3, the heat insulation material is tungsten bronze, the organic solvent is cyclohexanone, and the dispersant is polyacrylate. In Example 4, the heat insulation material is tin oxide, the organic solvent is methyl isobutyl ketone, and the dispersant is calcium stearate.

[0033] The specific preparation conditions of the low heat absorption PVC film in this invention are shown in Table 2. In Examples 5-8 and Comparative Examples 1-3, the stabilizer is calcium-zinc stabilizer, the plasticizer is dioctyl terephthalate, and the weight ratio of stearic acid to polyethylene wax in the processing aid is 1:2. In Examples 9-12, the stabilizer is barium-zinc stabilizer, the plasticizer is epoxidized soybean oil, and the weight ratio of stearic acid to polyethylene wax in the processing aid is 1:1. The heat insulation additive used in Examples 5-9 and Comparative Examples 1-2 is the heat insulation additive of Example 2. The heat insulation additive used in Example 10 is the heat insulation additive of Example 1. The heat insulation additive used in Example 11 is the heat insulation additive of Example 3. The heat insulation additive used in Example 12 is the heat insulation additive of Example 4.

[0034] Table 1: Specific preparation conditions for heat insulation additives.

[0035] The visible light transmittance and thermal insulation performance of the obtained low heat absorption PVC film were tested, and the results are shown in Table 3. The test methods were as follows: Visible light transmittance test: The visible light transmittance performance of all examples and comparative examples was tested according to GB / T 2680-94; Thermal insulation performance test: The thermal insulation performance of all examples and comparative examples was tested according to JG / T338-2011.

[0036] The visible light transmittance and thermal insulation performance of the obtained low heat absorption PVC film were tested, and the results are shown in Table 3. The test methods were as follows: Visible light transmittance test: The visible light transmittance performance of all examples and comparative examples was tested according to GB / T 2680-94; Thermal insulation performance test: The thermal insulation performance of all examples and comparative examples was tested according to JG / T338-2011.

[0037] As shown in Tables 2 and 3, the heat insulation performance of the prepared low-heat-absorbing PVC film first increases and then decreases with the gradual increase of the heat insulation additive. A smaller shading coefficient indicates better heat insulation, higher visible light transmittance, and relatively lower infrared light blocking rate. When the weight percentage of the heat insulation additive is 0.1–1.5 parts, the ultraviolet light blocking rate is 97%–98%, the highest infrared light blocking rate is 70%–90%, the visible light transmittance is 54%–76%, and the lowest shading coefficient is 47%–75%. The best-performing low-heat-absorbing PVC film is the one prepared with 0.5 parts of heat insulation additive, exhibiting an ultraviolet light blocking rate of 98%, a highest infrared light blocking rate of 90%, a visible light transmittance of 70%, and a lowest shading coefficient of 47%. The worst-performing film in the examples is the one prepared with 1.5 parts of heat insulation additive. The prepared low-heat-absorbing PVC film has an ultraviolet light blocking rate of 97%, an infrared light blocking rate of 73%, a visible light transmittance of 68%, and a relatively high shading coefficient of 75%. Comparative Example 1 is a PVC film with 0.08 parts by weight of heat-insulating additive added, which has the worst performance among the PVC films with heat-insulating additive, with a shading coefficient as high as 80%. Comparative Example 3 is a PVC film without heat-insulating additive added, with an infrared light blocking rate of only 10% and a shading coefficient as high as 86%. The infrared light blocking rate is much lower than that of the PVC film with heat-insulating additive added, and the shading coefficient is also much higher than that of the PVC film with heat-insulating additive added. This proves that adding heat-insulating additives can effectively block infrared light, significantly improve the heat insulation performance of the material, and that adding appropriate heat-insulating additives can more effectively block ultraviolet and infrared light while maintaining good visible light transmittance, thus achieving a good heat insulation effect.

[0038] Furthermore, the performance of the PVC films in Examples 10-12 is relatively low, but still higher than that of the PVC films in the comparative examples. This is because different preparation methods of the heat insulation additives affect the performance of the PVC films. In particular, the amount of dispersant and the preparation method affect the grafting rate of the material, which in turn affects the stability of the heat insulation slurry. Comparative Example 2 is a PVC film with 2.0 parts by weight of heat insulation additives added. Its shading coefficient is 68%, which is slightly lower than that of the PVC film with 1.5 parts by weight of heat insulation additives added in Example 8. However, its visible light transmittance is very poor, only 52%. Therefore, although the heat insulation effect of the floor is relatively improved with the increase of heat insulation additives, the visible light transmittance will decrease. The decrease in transmittance will affect the visibility of the wear layer of the floor. Therefore, only an appropriate amount of heat insulation additives can achieve the ideal heat insulation effect.

[0039] Table 2: Specific preparation conditions for low heat absorption PVC film.

[0040] Table 3: Performance test results of low heat absorption PVC film. Example Ultraviolet light barrier rate (%) Infrared light barrier rate (%) Visible light transmittance (%) Solar shading coefficient (%) 5 97 82 74 68 6 97 89 72 50 7 98 90 70 47 8 97 73 68 75 9 97 73 64 50 10 98 74 71 61 11 97 76 76 74 12 97 70 54 60 Comparative Example 1 96 69 78 80 Comparative Example 2 98 78 52 68 Comparative Example 3 96 10 80 86

[0041] PVC flooring was prepared using the PVC films of Examples 5-12 and Comparative Examples 1-3, respectively. The physical properties of the PVC flooring after exposure to a thermal environment, such as thermal stability and warpage, were tested in accordance with ISO 23999-2008 "Determination of dimensional stability and shrinkage of resilient floor coverings after exposure to a thermal environment". The test results are shown in Table 4.

[0042] As shown in Table 4, the warpage values ​​of the flooring prepared with the PVC films of Examples 5-12 and Comparative Examples 1-2 are 0.2-0.4 mm, which are all lower than the warpage value of the flooring prepared with the PVC film of Comparative Example 3 without the addition of heat-insulating additives. Furthermore, the heat shrinkage is also lower than that of Comparative Example 3. Other properties such as peel strength and scratch resistance are within the standard range and are good. Example 7 exhibits the best performance, with a heat shrinkage value of 0.05%, a warpage value of 0.2 mm, a peel strength of 99 N / 5 cm, and a scratch resistance of 21 N. This indicates that the addition of heat-insulating additives creates a heat-insulating effect in the flooring's wear layer, thereby reducing heat shrinkage and warpage. The experiments demonstrate that the low-heat-absorbing PVC film of the present invention, when applied to flooring, can effectively reduce warpage and brittleness in high-temperature environments, extending its service life.

[0043] Table 4: Results of Physical Performance Tests for Flooring

[0044] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of protection of the claims.

Claims

1. A thermal insulation additive, characterized in that, Each raw material includes the following weight parts: thermal insulation material 10-50 parts, organic solvent 40-70 parts, dispersing agent 2-10 parts, silane coupling agent 0.1-1.2 parts.

2. A thermal barrier additive according to claim 1, wherein, The thermal insulation material includes one or more of nano near-infrared absorbing powder and nano mid-far infrared reflecting powder.

3. A thermal barrier additive according to claim 2, wherein, The thermal insulation material is one or more of nano tin oxide, nano antimony tin oxide, lanthanum hexaboride, titanium dioxide, and cesium tungsten bronze, with a particle size of 10-100 nm.

4. A thermal barrier additive according to claim 1, wherein The organic solvent is one or any combination of cyclohexanone, toluene, methyl isobutyl ketone, and isopropyl alcohol.

5. A thermal barrier additive according to claim 1, wherein The dispersing agent is any one of polyacrylate, ethylene-acrylic acid copolymer, and calcium stearate.

6. A thermal barrier additive according to claim 1, wherein The silane coupling agent is any one of KH-550, KH-560, KH-570, and KH-792.

7. A thermal barrier additive according to claim 1, wherein The thermal insulation additive has a particle size of 50-120 nm.

8. The method of claim 1, wherein the thermal barrier additive is prepared by the steps of: The method includes the following steps: (1) weighing the following raw materials by weight parts: thermal insulation material 10-50 parts, organic solvent 40-70 parts, dispersing agent 2-10 parts, silane coupling agent 0.1-1.2 parts; (2) first add the thermal insulation material to the ball mill for grinding, with a speed of 100-500 r / min, and a grinding time of 1-6 h; then add the organic solvent and dispersing agent to the ball mill for grinding for 1-3 h, to obtain a ground material; (3) ultrasonic the ground material for 20-60 min to obtain a thermal insulation slurry; (4) add the silane coupling agent to the thermal insulation slurry, and heat in an oil bath at 50-80℃ while stirring for 8-16 h, to obtain a thermal insulation additive.

9. A thermal insulation additive according to any one of claims 1 to 7, characterised in that, Application in low heat absorption PVC film.

10. A low heat absorbing PVC film prepared by using the heat barrier additive according to claim 9, characterized in that, Each raw material includes the following weight parts: polyvinyl chloride 100 parts, plasticizer 20-30 parts, stabilizer 1-3 parts, processing aid 0.1-1.5 parts, and thermal insulation additive 0.1-1.5 parts.

11. The low heat PVC film according to claim 10, wherein, The plasticizer includes any one of dioctyl terephthalate, epoxy soybean oil, and dibutyl phthalate.

12. The low heat PVC film according to claim 10, wherein, The stabilizer includes any one of barium-zinc stabilizer and calcium-zinc stabilizer.

13. The low heat PVC film according to claim 10, wherein, The processing aid is a mixture of stearic acid and polyethylene wax, with a weight ratio of 1:1-1:

3.

14. The low heat PVC film of claim 10, wherein, The film thickness is 0.1-1 mm.

15. The method for preparing low heat absorption PVC film according to claim 10, characterized in that, The method includes the following steps: (1) weighing the following raw materials by weight parts: polyvinyl chloride 100 parts, plasticizer 20-30 parts, stabilizer 1-3 parts, processing aid 0.1-1.5 parts, and thermal insulation additive 0.1-1.5 parts; (2) put the above raw materials into a high-speed blender in sequence, stir for 5-10 min, mix the raw materials uniformly at 50-80℃, then pass through an open mill for open rolling, with an open rolling temperature of 175-190℃ and a time of 2-5 min; (3) send the open-rolled material into a calender, pass the entire substrate through a mixing roller calender at a temperature of 170-190℃ to form a sheet, and finally draw the obtained sheet out of the material through a cooling roller to obtain a low heat absorption PVC film.

16. The low heat PVC film according to claims 10-14, wherein, Application in low heat absorption PVC floor.

17. The low heat PVC film according to claim 16, wherein, The low-heat-absorption PVC floor is prepared by the following method: a low-heat-absorption PVC film is pasted on the surface of a PVC floor sheet with a color film, the sheet is cut after cooling, and then the sheet is heated and cooled, and then the sheet is cut, grooved, edged and chamfered to obtain the low-heat-absorption PVC floor.

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