阅读说明：本技术 一种建筑用保温隔热涂料及其制备方法 (Heat-preservation and heat-insulation coating for building and preparation method thereof ) 是由 林佳鸿 于 2021-07-03 设计创作，主要内容包括：本发明提供一种建筑用保温隔热涂料,包括以下重量份数的原料：水30～50份、醋乙乳液12～30份、硅丙乳液6～10份、纳米碳化硅5～10份、空心玻璃微珠4～6份、碳化硼3～4份、纳米二氧化钛5～7份、成膜助剂3～4份、消泡剂1～2份和分散剂0.2～0.5份。制备方法为把水、醋乙乳液和空心玻璃微珠混合制得第一混合乳液,将水、硅丙乳液、纳米碳化硅、纳米二氧化钛和碳化硼混合得到第二混合乳液,再将第一混合乳液和第二混合乳液混合升温加入成膜助剂、消泡剂和分散剂,采用上述特定的组分配比和制备方法可以增加保温隔热涂料的厚度,一道成膜厚度达到2600～3000μm,从而有利于保温隔热涂料在墙面上的大面积涂覆,且减少复涂次数,提高涂覆的效率。(The invention provides a heat-preservation and heat-insulation coating for buildings, which comprises the following raw materials in parts by weight: 30-50 parts of water, 12-30 parts of vinyl acetate emulsion, 6-10 parts of silicone-acrylic emulsion, 5-10 parts of nano silicon carbide, 4-6 parts of hollow glass beads, 3-4 parts of boron carbide, 5-7 parts of nano titanium dioxide, 3-4 parts of a film-forming assistant, 1-2 parts of a defoaming agent and 0.2-0.5 part of a dispersing agent. The preparation method comprises the steps of mixing water, vinyl acetate emulsion and hollow glass beads to prepare first mixed emulsion, mixing the water, silicone acrylic emulsion, nano silicon carbide, nano titanium dioxide and boron carbide to obtain second mixed emulsion, mixing the first mixed emulsion and the second mixed emulsion, heating, and adding a film forming auxiliary agent, a defoaming agent and a dispersing agent, wherein the thickness of the heat-insulation coating can be increased by adopting the specific component ratio and the preparation method, and the thickness of a primary film forming reaches 2600-3000 mu m, so that the large-area coating of the heat-insulation coating on a wall surface is facilitated, the recoating frequency is reduced, and the coating efficiency is improved.)

1. The heat-insulating coating for the building is characterized by comprising the following raw materials in parts by weight: 30-50 parts of water, 12-30 parts of vinyl acetate emulsion, 6-10 parts of silicone-acrylic emulsion, 5-10 parts of nano silicon carbide, 4-6 parts of hollow glass beads, 3-4 parts of boron carbide, 5-7 parts of nano titanium dioxide, 3-4 parts of a film-forming assistant, 1-2 parts of a defoaming agent and 0.2-0.5 part of a dispersing agent.

2. The building heat-preservation and heat-insulation coating as claimed in claim 1, further comprising 1-2 parts of an antifreeze, wherein the antifreeze is calcium chloride or calcium carbonate.

3. The building thermal insulation coating as claimed in claim 1, wherein the defoaming agent is tributyl phosphate.

4. The building thermal insulation coating as claimed in claim 1, wherein the film forming aid is propylene glycol butyl ether, dipropylene glycol methyl ether or a combination thereof.

5. The building thermal insulation coating as claimed in claim 1, wherein the dispersant is ammonium polyacrylate or sodium salt dispersant.

6. The heat-preservation and heat-insulation coating for the building as claimed in claim 1, characterized by comprising the following raw materials in parts by weight: 36 parts of water, 15 parts of vinyl acetate emulsion, 7 parts of silicone-acrylic emulsion, 7 parts of nano silicon carbide, 5 parts of hollow glass beads, 3 parts of boron carbide, 3 parts of film-forming assistant, 6 parts of nano titanium dioxide, 1 part of defoaming agent and 0.3 part of dispersing agent.

7. A preparation method of a heat-preservation and heat-insulation coating for buildings is characterized by comprising the following steps:

mixing 15-25 parts of water, 12-30 parts of vinyl acetate emulsion and 4-6 parts of hollow glass beads, and stirring at the temperature of 30-40 ℃ for 15-20 min to prepare first mixed emulsion;

mixing 15-25 parts of water, 6-10 parts of silicone-acrylic emulsion, 5-10 parts of nano silicon carbide, 5-7 parts of nano titanium dioxide and 3-4 parts of boron carbide, and stirring at 40-50 ℃ for 10-30 min to prepare second mixed emulsion;

and adding the prepared first mixed emulsion into the second mixed emulsion to prepare a third mixed emulsion, heating to 50-60 ℃, adding 3-4 parts of film-forming assistant, 1-2 parts of defoaming agent and 0.2-0.5 part of dispersing agent into the third mixed emulsion, and stirring for 15-30 min to obtain the heat-insulating coating for buildings.

8. The preparation method of the heat preservation and insulation coating for the building as claimed in claim 7 is characterized by comprising the following steps:

mixing 15 parts of water, 15 parts of vinyl acetate emulsion and 5 parts of hollow glass beads, and stirring for 15min at the temperature of 40 ℃ to prepare first mixed emulsion;

mixing 21 parts of water, 7 parts of silicone-acrylate emulsion, 7 parts of nano silicon carbide, 6 parts of nano titanium dioxide and 3 parts of boron carbide, and stirring at 50 ℃ for 10min to prepare second mixed emulsion;

adding the prepared first mixed emulsion into the second mixed emulsion to prepare a third mixed emulsion, heating to 60 ℃, adding 3 parts of film-forming assistant, 1 part of defoaming agent and 0.3 part of dispersing agent into the third mixed emulsion, and stirring for 15min to obtain the thermal insulation coating for buildings.

9. The preparation method of the heat preservation and insulation coating for the building as claimed in claim 7, wherein the defoaming agent is tributyl phosphate.

10. The preparation method of the building heat preservation and insulation coating as claimed in claim 7, characterized in that the dispersant is polyacrylic acid ammonium salt or sodium salt dispersant.

Technical Field

The invention relates to the technical field of coatings, in particular to a thermal insulation coating for buildings and a preparation method thereof.

Background

Building energy conservation is one of the key points of energy-saving work in China, and the heat-insulating coating which can play a role in heat insulation and heat preservation when being brushed on the surface to be constructed becomes a main product of building energy conservation. The developed countries pay attention to building energy conservation from the 70 th century, so far, the use of heat insulation materials is the most important measure for foreign building energy conservation, the building energy conservation work in China is started from the beginning of the 90 th century in the 20 th century, the heat insulation materials for building energy conservation are relatively few, through the development of thirty years, the production and technical system of heat insulation materials with complete varieties and initial scale is formed, and still, the developed countries have a great gap with the developed countries of industry.

At present, the domestic building energy-saving means is mainly to coat the heat-insulating coating on the wall surface, and the heat-insulating coating is divided into transparent heat-insulating coating and non-transparent heat-insulating coating according to different use occasions; according to the heat insulation mechanism, the heat insulation coating can be divided into a barrier heat insulation coating, a reflective heat insulation coating and a radiation heat insulation coating, and according to the climatic characteristics of different regions, a scheme of combining external wall heat insulation is provided, various heat insulation coatings are reasonably selected and used, a comfortable indoor heat environment is generated, and the purpose of saving energy is achieved.

However, the thickness of the existing heat-insulating coating coated on the wall surface is small, generally 1000-1200 μm, which is not beneficial to large-area coating, and the required total thickness can be reached by multiple re-coating, thus affecting the working efficiency.

Disclosure of Invention

The invention aims to provide a thermal insulation coating for buildings, which solves the problems that the existing thermal insulation coating is small in thickness when being coated on a wall surface, is not beneficial to large-area coating and needs to be recoated for many times.

The invention provides a heat-preservation and heat-insulation coating for buildings, which comprises the following raw materials in parts by weight: 30-50 parts of water, 12-30 parts of vinyl acetate emulsion, 6-10 parts of silicone-acrylic emulsion, 5-10 parts of nano silicon carbide, 4-6 parts of hollow glass beads, 3-4 parts of boron carbide, 3-4 parts of film-forming assistant, 5-7 parts of nano titanium dioxide, 1-2 parts of defoaming agent and 0.2-0.5 part of dispersing agent.

The heat-preservation and heat-insulation coating for the building, provided by the invention, has the following beneficial effects: the heat-insulating coating provided by the invention adopts the specific components and the proportion to increase the thickness of the prepared heat-insulating coating, and the thickness of a once film forming reaches 2600-3000 mu m, so that the heat-insulating coating is favorable for large-area coating on the wall surface, the recoating times are reduced, the coating efficiency is improved, and meanwhile, the prepared heat-insulating coating also has good heat-insulating performance.

In addition, the heat-preservation and heat-insulation coating for the building provided by the invention can also have the following additional technical characteristics:

further, the heat-insulating coating for the building also comprises 1-2 parts of an antifreezing agent, wherein the antifreezing agent is calcium chloride or calcium carbonate.

Further, the defoaming agent is tributyl phosphate.

Further, the film forming auxiliary agent is one or the combination of propylene glycol butyl ether and dipropylene glycol methyl ether.

Further, the dispersant is polyacrylic acid ammonium salt or sodium salt dispersant.

Further, the feed comprises the following raw materials in parts by weight: 36 parts of water, 15 parts of vinyl acetate emulsion, 7 parts of silicone-acrylic emulsion, 7 parts of nano silicon carbide, 5 parts of hollow glass beads, 3 parts of boron carbide, 3 parts of film-forming assistant, 6 parts of nano titanium dioxide, 1 part of defoaming agent and 0.3 part of dispersing agent.

The invention also provides a preparation method of the heat-preservation and heat-insulation coating for the building, which comprises the following steps:

mixing 15-25 parts of water, 12-30 parts of vinyl acetate emulsion and 4-6 parts of hollow glass beads, and stirring at the temperature of 30-40 ℃ for 15-20 min to prepare first mixed emulsion;

mixing 15-25 parts of water, 6-10 parts of silicone-acrylic emulsion, 5-10 parts of nano silicon carbide, 5-7 parts of nano titanium dioxide and 3-4 parts of boron carbide, and stirring at 40-50 ℃ for 10-30 min to prepare second mixed emulsion;

and adding the prepared first mixed emulsion into the second mixed emulsion to prepare a third mixed emulsion, heating to 50-60 ℃, adding 3-4 parts of film-forming assistant, 1-2 parts of defoaming agent and 0.2-0.5 part of dispersing agent into the third mixed emulsion, and stirring for 15-30 min to obtain the heat-insulating coating for buildings.

Further, the method specifically comprises the following steps:

mixing 15 parts of water, 15 parts of vinyl acetate emulsion and 5 parts of hollow glass beads, and stirring for 15min at the temperature of 40 ℃ to prepare first mixed emulsion;

mixing 21 parts of water, 7 parts of silicone-acrylate emulsion, 7 parts of nano silicon carbide, 6 parts of nano titanium dioxide and 3 parts of boron carbide, and stirring at 50 ℃ for 10min to prepare second mixed emulsion;

adding the prepared first mixed emulsion into the second mixed emulsion to prepare a third mixed emulsion, heating to 60 ℃, adding 3 parts of film-forming assistant, 1 part of defoaming agent and 0.3 part of dispersing agent into the third mixed emulsion, and stirring for 15min to obtain the thermal insulation coating for buildings.

Further, the defoaming agent is tributyl phosphate.

Further, the dispersant is polyacrylic acid ammonium salt or sodium salt dispersant.

The heat-preservation and heat-insulation coating for the building, provided by the invention, has the following beneficial effects: the raw materials are mixed twice, specifically, water, vinyl acetate emulsion and hollow glass beads are prepared into first mixed emulsion according to a specific proportion, water, silicone acrylic emulsion, nano silicon carbide, nano titanium dioxide and boron carbide are prepared into second mixed emulsion according to a specific proportion, and the first mixed emulsion and the second mixed emulsion are heated and mixed to increase the thickness of the prepared heat-insulating coating, so that the large-area coating of the heat-insulating coating on a wall surface is facilitated.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Detailed Description

In order that the objects, features and advantages of the invention will be more readily understood, reference will now be made in detail to the following description of the preferred embodiments of the invention. In the description, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the embodiments of the invention may be employed, but it is understood that the scope of the embodiments of the invention is not limited correspondingly. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.

The embodiment of the invention provides a heat-preservation and heat-insulation coating for buildings, which comprises the following raw materials in parts by weight: 30-50 parts of water, 12-30 parts of vinyl acetate emulsion, 6-10 parts of silicone-acrylic emulsion, 5-10 parts of nano silicon carbide, 4-6 parts of hollow glass beads, 3-4 parts of boron carbide, 3-4 parts of film-forming assistant, 5-7 parts of nano titanium dioxide, 1-2 parts of defoaming agent and 0.2-0.5 part of dispersing agent.

The heat-preservation and heat-insulation coating for the building, provided by the invention, has the following beneficial effects: the heat-insulating coating provided by the invention adopts the specific components and the proportion to increase the thickness of the prepared heat-insulating coating, and the thickness of one-time film forming reaches 2600-3000 microns, so that the heat-insulating coating is favorable for large-area coating on the wall surface, the recoating times are few, the coating efficiency is improved, and meanwhile, the prepared heat-insulating coating also has good heat-insulating performance.

In addition, the heat-preservation and heat-insulation coating for the building provided by the invention can also have the following additional technical characteristics:

further, the heat-insulating coating for the building also comprises 1-2 parts of an antifreezing agent, wherein the antifreezing agent is calcium chloride or calcium carbonate.

Further, the defoaming agent is tributyl phosphate.

Further, the film forming auxiliary agent is one or the combination of propylene glycol butyl ether and dipropylene glycol methyl ether.

Further, the dispersant is polyacrylic acid ammonium salt or sodium salt dispersant.

From the above description, the beneficial effects are: the anti-freezing agent is added into the coating to improve the anti-freezing property of the coating at low temperature, and the defoaming agent, the film forming additive and the dispersing agent are adopted to increase the film thickness and the heat insulation property of the coating.

Further, the feed comprises the following raw materials in parts by weight: 36 parts of water, 15 parts of vinyl acetate emulsion, 7 parts of silicone-acrylic emulsion, 7 parts of nano silicon carbide, 5 parts of hollow glass beads, 3 parts of boron carbide, 3 parts of film-forming assistant, 6 parts of nano titanium dioxide, 1 part of defoaming agent and 0.3 part of dispersing agent.

The invention also provides a preparation method of the heat-preservation and heat-insulation coating for the building, which comprises the following steps:

mixing 15-25 parts of water, 12-30 parts of vinyl acetate emulsion and 4-6 parts of hollow glass beads, and stirring at the temperature of 30-40 ℃ for 15-20 min to prepare first mixed emulsion;

mixing 15-25 parts of water, 6-10 parts of silicone-acrylic emulsion, 5-10 parts of nano silicon carbide, 5-7 parts of nano titanium dioxide and 3-4 parts of boron carbide, and stirring at 40-50 ℃ for 10-30 min to prepare second mixed emulsion;

and adding the prepared first mixed emulsion into the second mixed emulsion to prepare a third mixed emulsion, heating to 50-60 ℃, adding 3-4 parts of film-forming assistant, 1-2 parts of defoaming agent and 0.2-0.5 part of dispersing agent into the third mixed emulsion, and stirring for 15-30 min to obtain the heat-insulating coating for buildings.

The heat-preservation and heat-insulation coating for the building, provided by the invention, has the following beneficial effects: the raw materials are mixed twice, specifically, water, vinyl acetate emulsion and hollow glass beads are prepared into first mixed emulsion according to a specific proportion, water, silicone acrylic emulsion, nano silicon carbide, nano titanium dioxide and boron carbide are prepared into second mixed emulsion according to a specific proportion, and the first mixed emulsion and the second mixed emulsion are heated and mixed to increase the thickness of the prepared heat-insulating coating, so that the large-area coating of the heat-insulating coating on a wall surface is facilitated.

Further, the method specifically comprises the following steps:

mixing 15 parts of water, 15 parts of vinyl acetate emulsion and 5 parts of hollow glass beads, and stirring for 15min at the temperature of 40 ℃ to prepare first mixed emulsion;

mixing 21 parts of water, 7 parts of silicone-acrylate emulsion, 7 parts of nano silicon carbide, 6 parts of nano titanium dioxide and 3 parts of boron carbide, and stirring at 50 ℃ for 10min to prepare second mixed emulsion;

adding the prepared first mixed emulsion into the second mixed emulsion to prepare a third mixed emulsion, heating to 60 ℃, adding 3 parts of film-forming assistant, 1 part of defoaming agent and 0.3 part of dispersing agent into the third mixed emulsion, and stirring for 15min to obtain the thermal insulation coating for buildings.

Further, the defoaming agent is tributyl phosphate.

Further, the dispersant is polyacrylic acid ammonium salt or sodium salt dispersant.

From the above description, the beneficial effects are: the defoaming agent, the film-forming assistant and the dispersing agent are adopted to increase the film thickness and the heat-insulating property of the coating.

Example 1

A heat-insulating coating for buildings comprises the following raw materials: 3kg of water, 1.2kg of vinyl acetate emulsion, 0.6kg of silicone-acrylic emulsion, 0.5kg of nano silicon carbide, 0.4kg of hollow glass bead, 0.3kg of boron carbide, 0.5kg of nano titanium dioxide, 0.3kg of film-forming assistant, 0.1kg of defoaming agent and 0.02kg of dispersing agent;

the film-forming assistant is propylene glycol butyl ether, the defoaming agent is tributyl phosphate, and the dispersing agent is a polyacrylic ammonium salt dispersing agent 5027.

The preparation method of the heat-preservation and heat-insulation coating for the building comprises the following steps:

weighing the raw materials according to the weight, mixing 1.5kg of water, 1.2kg of vinyl acetate emulsion and 0.4kg of hollow glass beads, and stirring at the temperature of 30 ℃ for 20min to prepare first mixed emulsion;

mixing 1.5kg of water, 0.6kg of silicone-acrylic emulsion, 0.5kg of nano silicon carbide, 0.5kg of nano titanium dioxide and 0.3kg of boron carbide, and stirring for 30min at the temperature of 40 ℃ to prepare second mixed emulsion;

and adding the prepared first mixed emulsion into the second mixed emulsion to prepare a third mixed emulsion, heating to 50 ℃, adding 0.3kg of film-forming assistant, 0.1kg of defoaming agent and 0.02kg of dispersing agent into the third mixed emulsion, and stirring for 15-30 min to obtain the heat-insulating coating for the building.

Through experimental tests, the thickness of the one-time construction film of the thermal insulation coating for buildings prepared by the embodiment is 2600 micrometers.

Example 2

A heat-insulating coating for buildings comprises the following raw materials: 3.6kg of water, 1.5kg of vinyl acetate emulsion, 0.7kg of silicone-acrylic emulsion, 0.7kg of nano silicon carbide, 0.5kg of hollow glass bead, 0.3kg of boron carbide, 0.6kg of nano titanium dioxide, 0.3kg of film-forming assistant, 0.1kg of defoaming agent and 0.03kg of dispersing agent;

the film-forming aid is dipropylene glycol methyl ether, the defoaming agent is tributyl phosphate, and the dispersing agent is a sodium salt dispersing agent 5040.

The preparation method of the heat-preservation and heat-insulation coating for the building comprises the following steps:

weighing the raw materials according to the mass, mixing 1.5kg of water, 1.5kg of vinyl acetate emulsion and 0.5kg of hollow glass beads, and stirring for 15min at the temperature of 40 ℃ to prepare first mixed emulsion;

mixing 2.1kg of water, 0.7kg of silicone-acrylic emulsion, 0.7kg of nano silicon carbide, 0.6kg of nano titanium dioxide and 0.3kg of boron carbide, and stirring for 10min at the temperature of 50 ℃ to prepare second mixed emulsion;

adding the prepared first mixed emulsion into the second mixed emulsion to prepare a third mixed emulsion, heating to 60 ℃, adding 0.3kg of film-forming assistant, 0.1kg of defoaming agent and 0.03kg of dispersing agent into the third mixed emulsion, and stirring for 15min to obtain the heat-insulating coating for buildings.

Through experimental tests, the thickness of the one-time construction film-forming film of the thermal insulation coating for buildings prepared by the embodiment is 3000 μm.

Comparative example 1

Using example 2 as a control, comparative example 1 had the same composition of all the starting materials as example 2, i.e. comprised the following starting materials: 3.6kg of water, 1.5kg of vinyl acetate emulsion, 0.7kg of silicone-acrylic emulsion, 0.7kg of nano silicon carbide, 0.5kg of hollow glass bead, 0.3kg of boron carbide, 0.6kg of nano titanium dioxide, 0.3kg of film-forming assistant, 0.1kg of defoaming agent and 0.03kg of dispersing agent;

the film-forming aid is dipropylene glycol methyl ether, the defoaming agent is tributyl phosphate, and the dispersing agent is a sodium salt dispersing agent 5040.

Unlike example 2, comparative example 1 was prepared by the following method: weighing the raw materials according to the mass, heating to 60 ℃, mixing all the raw materials, uniformly stirring, and stirring for 50min to obtain the thermal insulation coating for the building.

Through experimental tests, the thickness of the one-time construction film-forming of the thermal insulation coating for buildings prepared by the embodiment is 2300 μm. Therefore, the preparation method can increase the thickness of the heat-insulating coating.

Example 3

A heat-insulating coating for buildings comprises the following raw materials: 5kg of water, 3kg of vinyl acetate emulsion, 1kg of silicone-acrylic emulsion, 1kg of nano silicon carbide, 0.6kg of hollow glass bead, 0.4kg of boron carbide, 0.7kg of nano titanium dioxide, 0.4kg of film-forming assistant, 0.2kg of defoaming agent and 0.05kg of dispersing agent;

the film forming auxiliary agent is propylene glycol butyl ether and dipropylene glycol methyl ether, the defoaming agent is tributyl phosphate, and the dispersing agent is a sodium salt dispersing agent 5040.

The preparation method of the heat-preservation and heat-insulation coating for the building comprises the following steps:

weighing the raw materials according to the mass, mixing 2.8kg of water, 3kg of vinyl acetate emulsion and 0.6kg of hollow glass beads, and stirring for 18min at the temperature of 35 ℃ to prepare first mixed emulsion;

mixing 2.2kg of water, 1kg of silicone-acrylic emulsion, 1kg of nano silicon carbide, 0.7kg of nano titanium dioxide and 0.4kg of boron carbide, and stirring for 27min at the temperature of 45 ℃ to prepare second mixed emulsion;

adding the prepared first mixed emulsion into the second mixed emulsion to prepare a third mixed emulsion, heating to 56 ℃, adding 0.4kg of film-forming additive into the third mixed emulsion, wherein 0.2kg of propylene glycol butyl ether, 0.2kg of dipropylene glycol methyl ether, 0.2kg of defoaming agent and 0.05kg of dispersing agent, and stirring for 25min to obtain the heat-insulating coating for buildings.

Through experimental tests, the thickness of the one-time construction film-forming film of the thermal insulation coating for buildings prepared by the embodiment is 2700 μm.

Example 4

A heat-insulating coating for buildings comprises the following raw materials: 4kg of water, 2.2kg of vinyl acetate emulsion, 0.8kg of silicone-acrylic emulsion, 0.8kg of nano silicon carbide, 0.6kg of hollow glass bead, 0.4kg of boron carbide, 0.7kg of nano titanium dioxide, 0.4kg of film-forming additive, 0.2kg of defoaming agent, 0.04kg of dispersing agent and 0.1kg of antifreezing agent;

the film-forming assistant is propylene glycol butyl ether, the defoaming agent is tributyl phosphate, the dispersing agent is a sodium salt dispersing agent 5040, and the antifreezing agent is calcium chloride.

The preparation method of the heat-preservation and heat-insulation coating for the building comprises the following steps:

weighing the raw materials according to the mass, mixing 2.7kg of water, 2.2kg of vinyl acetate emulsion and 0.6kg of hollow glass beads, and stirring at 37 ℃ for 20min to prepare first mixed emulsion;

mixing 1.3kg of water, 0.8kg of silicone-acrylic emulsion, 0.8kg of nano silicon carbide, 0.7kg of nano titanium dioxide and 0.4kg of boron carbide, and stirring for 30min at the temperature of 45 ℃ to prepare second mixed emulsion;

adding the prepared first mixed emulsion into the second mixed emulsion to prepare a third mixed emulsion, heating to 60 ℃, adding 0.4kg of film-forming additive, 0.2kg of defoaming agent, 0.04kg of dispersing agent and 0.1kg of antifreezing agent into the third mixed emulsion, and stirring for 25min to obtain the heat-insulating coating for buildings.

Experimental tests prove that the thickness of the one-time construction film-forming film of the thermal insulation coating for buildings prepared by the embodiment is 2800 mu m.

Example 5

A heat-insulating coating for buildings comprises the following raw materials: 4kg of water, 2.7kg of vinyl acetate emulsion, 0.8kg of silicone-acrylic emulsion, 0.7kg of nano silicon carbide, 0.6kg of hollow glass bead, 0.3kg of boron carbide, 0.7kg of nano titanium dioxide, 0.4kg of film-forming assistant, 0.2kg of defoaming agent, 0.04kg of dispersing agent and 0.2kg of antifreezing agent;

the film forming auxiliary agent is propylene glycol butyl ether, the defoaming agent is tributyl phosphate, the dispersing agent is a sodium salt dispersing agent 5040, and the antifreezing agent is calcium carbonate.

The preparation method of the heat-preservation and heat-insulation coating for the building comprises the following steps:

weighing the raw materials according to the mass, mixing 2.7kg of water, 2.7kg of vinyl acetate emulsion and 0.6kg of hollow glass beads, and stirring at 37 ℃ for 20min to prepare first mixed emulsion;

mixing 1.3kg of water, 0.8kg of silicone-acrylic emulsion, 0.8kg of nano silicon carbide, 0.7kg of nano titanium dioxide and 0.3kg of boron carbide, and stirring for 30min at the temperature of 45 ℃ to prepare second mixed emulsion;

adding the prepared first mixed emulsion into the second mixed emulsion to prepare a third mixed emulsion, heating to 60 ℃, adding 0.4kg of film-forming additive, 0.2kg of defoaming agent, 0.04kg of dispersing agent and 0.2kg of antifreezing agent into the third mixed emulsion, and stirring for 25min to obtain the heat-insulating coating for buildings.

Through experimental tests, the thickness of the one-time construction film-forming film of the thermal insulation coating for buildings prepared by the embodiment is 2900 μm.

Comparative example 2

Two groups of experimental controls are set, the raw material composition of the first group of the thermal insulation coating for buildings adopts the formula of the embodiment 2 of the invention, and the concrete steps are as follows: 3.6kg of water, 1.5kg of vinyl acetate emulsion, 0.7kg of silicone-acrylic emulsion, 0.7kg of nano silicon carbide, 0.5kg of hollow glass bead, 0.3kg of boron carbide, 0.6kg of nano titanium dioxide, 0.3kg of film-forming assistant, 0.1kg of defoaming agent and 0.03kg of dispersing agent;

the film-forming aid is dipropylene glycol methyl ether, the defoaming agent is tributyl phosphate, and the dispersing agent is a sodium salt dispersing agent 5040. The raw materials are stirred and mixed uniformly to obtain the heat-insulating coating, and the thickness of one-step film forming is 2680 mu m.

Second group: the raw materials of the first group, namely the vinyl acetate emulsion and the silicone acrylic emulsion are replaced by styrene-acrylic emulsion, and the nano silicon carbide, the boron carbide and the nano titanium dioxide are omitted, namely the raw materials comprise: 3.6kg of water, 2.2kg of styrene-acrylic emulsion, 0.5kg of hollow glass beads, 0.3kg of film-forming additive, 0.1kg of defoaming agent and 0.03kg of dispersing agent; the film-forming aid is dipropylene glycol methyl ether, the defoaming agent is tributyl phosphate, and the dispersing agent is a sodium salt dispersing agent 5040. The raw materials are stirred and mixed to obtain the heat-insulating coating with the thickness of 1100 mu m. Through comparison of the two groups of experiments, the raw materials of the invention, namely the vinyl acetate emulsion, the silicone acrylic emulsion, the nano silicon carbide, the boron carbide and the nano titanium dioxide, are indispensable.

As shown in Table 1, the data of examples 1 to 5, comparative example 1 and conventional thermal insulating coating are shown.

As can be seen from the above table, the thickness of the building thermal insulation coating prepared by the raw materials and the method of the embodiments 1 to 5 is 2600 to 3000 micrometers, the thickness is 1000 to 1200 micrometers higher than that of the existing thermal insulation coating, large-area coating is facilitated, the number of recoating times is reduced, the working efficiency is greatly improved, and the experimental data obtained by the embodiment 2 and the comparative example 1 show that the preparation method of the invention can increase the thickness of the thermal insulation coating to a certain extent.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.