A flexible fluorosilicone thermal barrier coating for aerogel insulation systems and method of making the same

Abstract

The present application relates to the technical field of composite materials, and discloses an elastic fluorosilicon thermal insulation coating for aerogel thermal insulation systems and a preparation method thereof.The coating provided by the present application comprises modified hollow glass microbeads, elastic water-based fluorocarbon emulsion, silicone resin emulsion, light stabilizer and other components.A silane coupling agent and an acrylic ester are used to modify the hollow glass microbeads, so that the compatibility of the hollow glass microbeads with fluorosilicon resin is improved.The modified glass microbeads are compounded with fluorocarbon emulsion, silicone resin and histamine-type light stabilizer to produce a synergistic effect, so that the comprehensive performance of the coating is improved.The coating provided by the present application has a uniform paint film and high coating strength, and the problems of coating aging cracking and reduced thermal insulation performance caused by poor weather resistance of traditional aerogel thermal insulation coatings under outdoor conditions are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite materials, in particular to an elastic fluorosilicon thermal insulation coating for aerogel thermal insulation systems and a preparation method thereof. BACKGROUND

[0002] With the rapid development of the construction industry and the increasing energy crisis, energy saving and consumption reduction of buildings are becoming more and more important. Among them, the energy consumption of heating and air conditioning accounts for 55% of the total building energy consumption, and is increasing year by year. Therefore, the research and development of building thermal insulation coatings have great economic, environmental and social benefits.

[0003] The use of thermal insulation coatings on buildings not only realizes the original functions of decoration, protection and mildew prevention of coatings, but also maintains the indoor temperature constant through the thermal insulation of the coating, reduces the energy consumption of heating and air conditioning, and achieves energy saving benefits. In recent years, aerogel type thermal insulation coatings have appeared, which use low thermal conductivity inorganic materials such as aerogel or hollow glass microspheres compounded with coatings to achieve thermal insulation effect. Its performance has been greatly improved compared with traditional reflective thermal insulation coatings. However, as a porous material, the loose and porous structure of aerogel leads to strong water absorption and poor mechanical strength of the coating, and due to the influence of light, a thermal bridge is generated, which is easy to produce micro deformation due to thermal expansion and cold contraction, so that the bonding force of each component in the coating is weakened, and surface collapse and cracking occur after film formation. The water resistance, stain resistance, cracking resistance and weather resistance of this kind of aerogel type thermal insulation coating need to be improved.

[0004] In summary, there is an urgent need to develop an elastic fluorosilicon thermal insulation coating for aerogel thermal insulation systems that not only has good thermal insulation performance, but also overcomes the problems of surface cracking and easy pollution to meet the current market demand. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide an elastic fluorosilicon thermal insulation coating for aerogel thermal insulation systems. This thermal insulation coating is blended from fluorocarbon emulsion and silicone resin, hollow glass microspheres are modified by silane coupling agent and acrylate, and light stabilizer is introduced, so that the coating not only has good thermal insulation performance of aerogel, but also overcomes the problems of poor water resistance, stain resistance, cracking resistance and weather resistance of traditional aerogel coatings, and prolongs the service life of the coating.

[0006] One object of the present application is to provide an elastic fluorosilicon thermal insulation coating for aerogel thermal insulation systems, which comprises the following components in mass fraction:

[0007]

[0008]

[0009] The modified hollow glass microspheres are obtained by reacting hollow glass microspheres with a silane coupling agent and dodecyl acrylate.

[0010] Further, the fluorine content of the elastic water-based fluorocarbon emulsion is 10-12%.

[0011] Further, the light stabilizer is a nano-coated polymeric hindered amine light stabilizer.

[0012] Further, the auxiliary agent is selected from one or more of antifreeze, dispersant, wetting agent, film-forming auxiliary agent, defoaming agent, silane coupling agent, thickening agent, bactericide, light stabilizer, mildew-proof agent, and pH regulator.

[0013] Another object of the present application is to provide a preparation method of the elastic fluorosilicon thermal insulation coating for aerogel insulation systems.

[0014] S1, preparing modified hollow glass microspheres

[0015] S1-1, adding hollow glass microspheres and a silane coupling agent to a solvent, heating and stirring to react, to obtain an intermediate product;

[0016] S1-2, adding the intermediate product, dodecyl acrylate, and an initiator to a solvent, heating to react under an inert gas atmosphere, to obtain the modified hollow glass microspheres;

[0017] S2, adding the modified hollow glass microspheres and the remaining ingredients in the above mass fractions to a dispersion cylinder, and stirring to mix uniformly, to obtain the elastic fluorosilicon thermal insulation coating for aerogel insulation systems.

[0018] Further, the silane coupling agent is a methacryloxy silane coupling agent.

[0019] Further, the heating temperature in step S1-1 is 60-100°C, and the reaction time is 90-240 min.

[0020] Further, the heating temperature in step S1-2 is 70-80°C, and the reaction time is 30-90 min.

[0021] Further, the mass ratio of the intermediate product to the dodecyl acrylate in step S1-2 is 1:5-1:10.

[0022] The present application has the following beneficial effects:

[0023] The present application is directed to the problem that the surface of traditional glass microbeads is smooth and not easy to be compatible with organic resin matrix material, and the modified hollow glass microbeads are used, and a silane coupling agent and dodecyl acrylate are copolymerized as a compatibilizer, wherein the silane coupling agent enhances the compatibility of the glass microbeads with the organic resin material, and the dodecyl acrylate and the silane coupling agent on the surface of the glass microbeads are free radical copolymerized, the modified glass microbeads improve the compatibility between each component in the coating, the mechanical properties and film-forming property of the paint film are better, the adhesion of the coating is improved, and the phenomena such as loss of luster, cracking, blistering and discoloration of the coating are effectively prevented. In addition, the modified glass microbeads are compounded with fluorocarbon emulsion, silicon resin, hindered amine light stabilizer and other components to play a synergistic effect, and the light aging resistance and heat preservation performance of the coating are comprehensively improved. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the technical solutions of the present application, the following examples are listed. The raw materials, reactions and post-treatment means appearing in the examples are all common raw materials on the market and technical means familiar to those skilled in the art, unless otherwise stated.

[0025] The words "preferred", "preferably", "more preferred" and the like in the present application refer to the embodiments of the present application which can provide certain beneficial effects in certain cases. However, other embodiments can also be preferred in the same or other cases. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not usable, nor is it intended to exclude other embodiments from the scope of the present application.

[0026] It should be understood that, except in any operating examples, or otherwise indicated, the use of amounts or all numbers expressing, for example, amounts of ingredients in the specification and claims are to be understood as being modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and attached claims are approximations that can vary depending on the desired properties sought to be obtained by the present application.

[0027] The following raw materials are used in the embodiments of the present application:

[0028] The elastic water-based fluorocarbon emulsion is model WF-TFT1010, purchased from Jining Fanghe Chemical Industry Co., Ltd.;

[0029] The silicon resin emulsion is model Wacker BS43N, purchased from Nanjing Chuhai New Material Co., Ltd.;

[0030] The hollow glass microbeads are model T60, purchased from Shijiazhuang Runbang New Material Co., Ltd.;

[0031] The filler is model GF110 heavy calcium carbonate (1000 mesh), purchased from Shijiazhuang Jinli Mining Industry Co., Ltd.;

[0032] Reflective heat insulation pigment, model Altiris550, purchased from Barentz;

[0033] Antifreeze, model 99wt% glycol, purchased from Shandong Rongsheng New Material;

[0034] Dispersant, model P30, purchased from Guangzhou Sisource Chemical;

[0035] Wetting agent, model LCN407, purchased from Sichuan Ruikai Bang Chemical;

[0036] Film-forming aid, model 99wt% alcohol ester twelve, purchased from Shandong Rongsheng New Material;

[0037] Defoamer, model F-210, purchased from Guangzhou Sisource Chemical;

[0038] Thickening agent, model COAPUR 817W, purchased from Shanghai Kain Chemical;

[0039] Silane coupling agent, model KH-570, purchased from Nanjing Xuanhao New Material;

[0040] Light stabilizer, model TINUVIN123DW, purchased from BASF Chemical;

[0041] Mildew-proof agent, model MBS5050, purchased from Guangzhou Sisource Chemical;

[0042] pH regulator, model AMP-95, purchased from Guangzhou Jinshengji Chemical;

[0043] Aerogel paste, model KNF-G, purchased from Anhui Kaoang New Material;

[0044] Cellulose, model Ashland PLUS330, purchased from Shanghai Kain Chemical;

[0045] Bentonite, model BS-1C, purchased from Zhejiang Huate New Material;

[0046] Silicone emulsion, model BS1001, purchased from Foshan Meiren Chemical;

[0047] Bactericide, model JA-2220, purchased from Guangzhou Jingao New Material;

[0048] Styrene-acrylate emulsion, model BATF9333, purchased from Badefu Technology;

[0049] H2O2 solution, model 30wt% aqueous solution, purchased from Guangzhou Qiyuan Chemical;

[0050] Initiator BPO, model 94-36-0 benzoyl peroxide, purchased from Shanghai Kain Chemical;

[0051] The "parts" referred to in the embodiments of the present application all refer to mass parts.

[0052] Embodiment 1

[0053] An elastic fluorosilicon thermal insulation coating for aerogel insulation systems, comprising the following components in mass parts:

[0054]

[0055] The preparation method of the above-mentioned elastic fluorosilicon thermal insulation coating for aerogel insulation systems is as follows:

[0056] S1, preparation of modified hollow glass microspheres

[0057] S1-1, take 2g of hollow glass microspheres, wash with anhydrous ethanol and filter, and put into an oven at 100℃ for drying for 12h to obtain clean hollow glass microspheres; take 0.1g of silane coupling agent and the hollow glass microspheres in turn, mix uniformly, add 20ml of ethanol aqueous solution (10wt%), and heat to 60℃ in a condensation reflux device with a constant temperature water bath, stir for 4h, filter, and put into an oven at 100℃ for drying for 12h to obtain an intermediate product;

[0058] S1-2, blend 2g of the intermediate product with 10g of 2-dodecyl acrylate and 0.1g of initiator BPO, disperse in 100ml of toluene solvent, and heat to 80℃ under nitrogen protection and stir for 1h; remove the solvent by reduced pressure filtration, wash with ethanol and water, and put the remaining material into an oven at 40℃ for drying for 12h to obtain the modified hollow glass microspheres;

[0059] S2, add the modified hollow glass microspheres and the remaining components in the above mass parts in a dispersion cylinder, stir and mix uniformly, and the elastic fluorosilicon thermal insulation coating for aerogel insulation systems is obtained.

[0060] Embodiment 2

[0061] An elastic fluorosilicon thermal insulation coating for aerogel insulation systems, comprising the following components in mass parts:

[0062]

[0063] The preparation method of the above-mentioned elastic fluorosilicon thermal insulation coating for aerogel insulation systems is the same as that of embodiment 1, only the mass parts of the above composition are changed.

[0064] Embodiment 3

[0065] An elastic fluorosilicon thermal insulation coating for aerogel insulation systems, comprising the following components in mass parts:

[0066]

[0067] The preparation method of the elastic fluorosilicon thermal insulation coating for aerogel thermal insulation system is the same as that in Example 1, and only the mass fractions of the above composition are changed.

[0068] Comparative Example 1

[0069] The raw materials and preparation method of Comparative Example 1 are the same as those in Example 1, and the only difference is that in Comparative Example 1, the modified hollow glass microbeads are not added, but an equal mass fraction of hollow glass microbeads is used instead.

[0070] Comparative Example 2

[0071] The raw materials and preparation method of Comparative Example 2 are the same as those in Example 1, and the only difference is that in Comparative Example 2, step S1-2 is omitted, and the modified hollow glass microbeads are replaced by an equal mass fraction of the intermediate product obtained in step S1-1.

[0072] Comparative Example 3

[0073] The raw materials and preparation method of Comparative Example 3 are the same as those in Example 1, and the only difference is that in Comparative Example 3, the hindered amine light stabilizer is not added, but an equal mass fraction of a light absorber is used instead.

[0074] The light absorber is a benzoate light absorber, model UV120, purchased from Nanjing Milan Chemicals.

[0075] Test Example

[0076] Test Method:

[0077] Implementation of the elastic fluorosilicon thermal insulation coating: successively apply putty, silicone penetrating primer, aerogel thermal insulation intermediate coating, and elastic fluorosilicon thermal insulation coating on the cement substrate from inside to outside. Among them, the thermal insulation intermediate coating provides thermal resistance performance, and the elastic fluorosilicon thermal insulation coating provides thermal reflection and protection performance.

[0078] In the following examples, the mass ratio of the silicone penetrating primer is: 40% silicone emulsion, 60% water.

[0079] The mass ratio of the aerogel thermal insulation intermediate coating is: 31% styrene-acrylic emulsion, 16% aerogel slurry, 17% hollow glass microbeads, 7% additives, and the balance of water.

[0080] Among them, the additives include 0.5% cellulose, 0.4% bentonite, 2.2% film-forming additives, 2.2% antifreeze, 0.1% pH adjuster, 0.5% dispersant, 0.2% wetting agent, 0.5% defoamer, 0.2% thickener, and 0.2% mildewcide.

[0081] The coating samples prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to performance testing according to the standards of HG / T 4104-2019 Water-based fluorocarbon architectural coatings, GB / T 25261-2018 Reflective thermal insulation coatings for buildings, etc., and the performance testing results of the elastic fluorosilicon thermal insulation coatings are shown in Table 1:

[0082] Table 1 Performance testing results

[0083]

[0084]

[0085] According to Table 1, the mechanical, thermal insulation, and weather resistance performance of Examples 1-3 are obviously more advantageous than Comparative Examples 1-3. The coating without adding modified hollow glass microspheres in the comparative example has poor comprehensive performance, and the performance decreases significantly after aging test, which shows that the modified hollow glass microspheres can effectively enhance the compatibility of each component of the coating, improve the mechanical properties, and enhance the overall adhesion of the coating. The modified glass microspheres introduce dodecyl acrylate through a coupling agent, and are compounded with fluorocarbon emulsion, silicone resin, light stabilizer, etc., to play a synergistic effect. The test results show that the elastic fluorosilicon thermal insulation coating prepared by the present application has good mechanical properties and good weather resistance, enhances the coating strength, and improves the problems of coating aging cracking and thermal insulation performance degradation caused by poor weather resistance of traditional thermal insulation aerogel coatings under outdoor light conditions.

[0086] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. Thus, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application should be defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and range of equivalents of the claims.

[0087] In addition, it should be understood that although the present specification is described in terms of embodiments, each embodiment does not contain only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. An elastomeric fluorosilicone thermal barrier coating for aerogel insulation systems, characterized in that, The elastic fluorosilicon thermal insulation coating for aerogel thermal insulation system comprises the following components in mass fraction: Elastic water-based fluorocarbon emulsion 35-40 parts Silicone emulsion 5-10 parts Reflective thermal insulation pigment 5-8 parts Titanium white 10-15 parts Modified hollow glass microbeads 2-4 parts Filler 15-20 parts Auxiliary agent 4.9-7.8 parts Water 5-10 parts The modified hollow glass microbeads are obtained by the reaction of hollow glass microbeads with silane coupling agent and dodecyl acrylate; The preparation method of the elastic fluorosilicon thermal insulation coating for aerogel thermal insulation system comprises the following steps: S1, preparing modified hollow glass microbeads S1-1, adding hollow glass microbeads and silane coupling agent into solvent, heating and stirring to react to obtain an intermediate product; S1-2, adding the intermediate product, dodecyl acrylate and initiator into solvent, heating to react under inert gas atmosphere to obtain the modified hollow glass microbeads; S2, adding the modified hollow glass microbeads and the remaining components in the above mass fraction into a dispersion cylinder, stirring and mixing uniformly to obtain the elastic fluorosilicon thermal insulation coating for aerogel thermal insulation system; The fluorine content of the elastic water-based fluorocarbon emulsion is 10-12 %; The silane coupling agent is methacryloxy silane coupling agent; The mass ratio of the intermediate product to the dodecyl acrylate in step S1-2 is 1:5-1:

10.

2. The elastomeric fluorosilicone thermal barrier coating for aerogel insulation systems of claim 1, wherein, The auxiliary agent is selected from one or more of antifreeze, dispersant, wetting agent, film-forming auxiliary agent, defoaming agent, silane coupling agent, thickening agent, bactericide, light stabilizer, mildew-proof agent and pH regulator.

3. The elastomeric fluorosilicone thermal barrier coating for aerogel insulation systems of claim 1, wherein, The heating temperature in step S1-1 is 60-100℃, and the reaction time is 90-240 min.

4. The elastomeric fluorosilicone thermal barrier coating for aerogel insulation systems of claim 1, wherein, The heating temperature in step S1-2 is 70-80℃, and the reaction time is 30-90 min.

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