阅读说明：本技术 水性隔热涂料 (Water-based heat insulation coating ) 是由 龚俊琼 于 2020-08-19 设计创作，主要内容包括：本发明公开了一种水性隔热涂料。所述一种水性隔热涂料包括下述重量份原料：苯丙乳液40-60份；石墨烯二氧化硅凝胶40-60份；滑石粉10-20份；空心玻璃微珠10-20份；聚氧乙烯醚AEO-9 0.2-0.6份；正丁醇0.1-0.4份；流平剂0.1-0.5份；水20-40份。本发明引入密闭空心球体玻璃微珠、具有三维网络纳米多孔结构的石墨烯二氧化硅凝胶,制得的水性隔热涂料,隔热保温性能稳定、隔热功能强,作为建筑物外墙保温层使用,是一种高效节能解决方案。(The invention discloses a water-based heat insulation coating. The water-based heat insulation coating comprises the following raw materials in parts by weight: 40-60 parts of styrene-acrylic emulsion; 40-60 parts of graphene silica gel; 10-20 parts of talcum powder; 10-20 parts of hollow glass beads; 90.2-0.6 parts of polyoxyethylene ether AEO-90.2; 0.1-0.4 part of n-butyl alcohol; 0.1-0.5 part of leveling agent; 20-40 parts of water. According to the invention, the closed hollow sphere glass beads and the graphene silica gel with the three-dimensional network nano porous structure are introduced, so that the prepared water-based heat insulation coating has stable heat insulation performance and strong heat insulation function, is used as a building outer wall heat insulation layer, and is an efficient energy-saving solution.)

1. A water-based heat insulation coating comprises the following raw materials in parts by weight:

40-60 parts of styrene-acrylic emulsion;

40-60 parts of graphene silica gel;

10-20 parts of talcum powder;

10-20 parts of hollow glass beads;

90.2-0.6 parts of polyoxyethylene ether AEO-90.2;

0.1-0.4 part of n-butyl alcohol;

0.1-0.5 part of leveling agent;

20-40 parts of water.

2. The aqueous thermal insulating coating according to claim 1, wherein the graphene silica gel is prepared by the following method:

(1) uniformly mixing ethyl orthosilicate, absolute ethyl alcohol and water, dropwise adding hydrochloric acid to control the pH value to be 3-4, and magnetically stirring at the temperature of 30-50 ℃ and 500rpm for 2-4 hours to obtain a mixed solution;

the mass ratio of the ethyl orthosilicate to the absolute ethyl alcohol to the water is (40-70): (10-30): 100, respectively;

(2) adding graphene, silicon carbide and a silanization reagent into the mixed solution, dropwise adding ammonia water to control the pH value to be 7.5-8.5, stirring at 500rpm for 10-30 minutes at 300-; standing at 30-50 deg.C for 24-72 hr to obtain wet gel;

the mass ratio of the graphene to the silicon carbide to the silanization reagent to the mixed solution is (0.01-0.06): (0.02-0.10): (0.02-0.14): 1;

(3) drying the wet gel at 50-60 deg.C under normal pressure for 30-60 hr.

Technical Field

The invention relates to the field of coatings, in particular to a water-based heat-insulating coating.

Background

Building energy consumption is one of the major components of energy consumption. Building energy consumption continues to increase rapidly, and has exceeded the energy consumption required by transportation and industry. Building insulation is considered a simple and efficient technique while increasing the production of renewable energy. Therefore, a great deal of research is being conducted to reduce energy consumption by appropriate, effective insulation strategies: development and application of heat insulation materials.

The heat-insulating material is generally a light, loose, porous and fibrous material. It can be divided into organic materials and inorganic materials according to its composition. The former has better heat insulation performance than the latter, but the latter has better durability than the former. The heat conductivity coefficient is a main index for measuring the performance of the heat-insulating material. The smaller the thermal conductivity, the smaller the amount of heat transferred through the material, the better the thermal insulation performance, the thermal conductivity of the material is determined by the composition, internal structure, volume weight, etc. of the material, and also the average temperature during heat transfer and the water content of the material. Generally speaking, the lighter the volume weight, the lower the thermal conductivity.

Along with global warming, the environment is protected to slow down global temperature rise and is more and more valued by people, a layer of heat-insulating coating is coated on the outer wall of a building, the heat of the outer layer of the coating can be reflected, heat exchange on two sides of the coating is blocked, the temperature of the outer surface of the building can be effectively reduced, the load of an air conditioner is further reduced, and the energy-saving and environment-friendly effects are good.

However, the heat insulation coating in the prior art has the problems that the heat insulation effect is not ideal, most of the heat insulation coating is not water-based coating, and the environment is not protected.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to be realized by the following technical scheme:

a water-based heat insulation coating comprises the following raw materials in parts by weight:

40-60 parts of styrene-acrylic emulsion;

40-60 parts of graphene silica gel;

10-20 parts of talcum powder;

10-20 parts of hollow glass beads;

90.2-0.6 parts of polyoxyethylene ether AEO-90.2;

0.1-0.4 part of n-butyl alcohol;

0.1-0.5 part of leveling agent;

20-40 parts of water.

Uniformly mixing water, n-butanol and polyoxyethylene ether AEO-9; then adding the graphene silica gel, the talcum powder and the hollow glass beads, and stirring and mixing uniformly; and adding the styrene-acrylic emulsion and the leveling agent, stirring and mixing uniformly, and filtering to obtain the water-based heat-insulating coating.

Further, the graphene silica gel is prepared by the following method:

(1) uniformly mixing ethyl orthosilicate, absolute ethyl alcohol and water, dropwise adding hydrochloric acid to control the pH value to be 3-4, and magnetically stirring at the temperature of 30-50 ℃ and 500rpm for 2-4 hours to obtain a mixed solution;

the mass ratio of the ethyl orthosilicate to the absolute ethyl alcohol to the water is (40-70): (10-30): 100, respectively; preferably (50-65): (20-28): 100, respectively;

the concentration of the hydrochloric acid is 20-38 wt%;

(2) adding graphene, silicon carbide and a silanization reagent into the mixed solution, dropwise adding ammonia water to control the pH value to be 7.5-8.5, stirring at 500rpm for 10-30 minutes at 300-; standing at 30-50 deg.C for 24-72 hr to obtain wet gel;

the mass ratio of the graphene to the silicon carbide to the silanization reagent to the mixed solution is (0.01-0.06): (0.02-0.10): (0.02-0.14): 1, preferably (0.01-0.03): (0.04-0.08): (0.04-0.10): 1;

the concentration of the ammonia water is 0.2-0.8 mol/L;

(3) and drying the wet gel at 50-60 ℃ under normal pressure for 30-60 hours to obtain the graphene silica gel.

The silanization reagent is at least one of trimethyl chlorosilane, vinyl trimethoxy silane and methyl trimethoxy silane. Preferably, the silylating agent is vinyltrimethoxysilane and/or methyltrimethoxysilane; further preferably, the silylation agent is vinyltrimethoxysilane and methyltrimethoxysilane in a mass ratio of 1: (3-5).

The graphene silica gel disclosed by the invention has a three-dimensional network nano porous structure and low thermal conductivity, and can be applied to heat preservation and insulation in the fields of optics, acoustics, electricity and the like.

According to the invention, the closed hollow sphere glass beads and the graphene silica gel with the three-dimensional network nano porous structure are introduced, so that the prepared water-based heat insulation coating has stable heat insulation performance and strong heat insulation function, is used as a building outer wall heat insulation layer, and is an efficient energy-saving solution.

Detailed Description

The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.

A water-based heat insulation coating comprises the following raw materials in parts by weight:

40-60 parts of styrene-acrylic emulsion;

40-60 parts of graphene silica gel;

10-20 parts of talcum powder;

10-20 parts of hollow glass beads;

90.2-0.6 parts of polyoxyethylene ether AEO-90.2;

0.1-0.4 part of n-butyl alcohol;

0.1-0.5 part of leveling agent;

20-40 parts of water.

Uniformly mixing water, n-butanol and polyoxyethylene ether AEO-9; then adding the graphene silica gel, the talcum powder and the hollow glass beads, and stirring and mixing uniformly; and adding the styrene-acrylic emulsion and the leveling agent, stirring and mixing uniformly, and filtering to obtain the water-based heat-insulating coating.

According to the invention, the closed hollow sphere glass beads and the graphene silica gel with the three-dimensional network nano porous structure are introduced, so that the prepared water-based heat insulation coating has stable heat insulation performance and strong heat insulation function, is used as a building outer wall heat insulation layer, and is an efficient energy-saving solution.

A preparation method of graphene silica gel comprises the following steps:

(1) uniformly mixing ethyl orthosilicate, absolute ethyl alcohol and water, dropwise adding hydrochloric acid to control the pH value to be 3-4, and magnetically stirring at the temperature of 30-50 ℃ and 500rpm for 2-4 hours to obtain a mixed solution;

the mass ratio of the ethyl orthosilicate to the absolute ethyl alcohol to the water is (40-70): (10-30): 100, respectively; preferably (50-65): (20-28): 100, respectively;

dropwise adding hydrochloric acid to adjust the pH value to 3-4, wherein the hydrochloric acid has the function of providing an acidic environment for hydrolysis, and the concentration of the hydrochloric acid is 20-38 wt%;

(2) adding graphene, silicon carbide and a silanization reagent into the mixed solution, dropwise adding ammonia water to control the pH value to be 7.5-8.5, stirring at 500rpm for 10-30 minutes at 300-; standing at 30-50 deg.C for 24-72 hr to obtain wet gel;

the mass ratio of the graphene to the silicon carbide to the silanization reagent to the mixed solution is (0.01-0.06): (0.02-0.10): (0.02-0.14): 1, preferably (0.01-0.03): (0.04-0.08): (0.04-0.10): 1;

the concentration of the ammonia water is 0.2-0.8 mol/L;

standing at 30-50 deg.C for 24-72 hr for aging;

(3) and drying the wet gel at 50-60 ℃ under normal pressure for 30-60 hours to obtain the graphene silica gel.

Tetraethoxysilane is a relatively safe reagent, and the method is used for preparing sol; the gel aging anhydrous ethanol has the functions of reinforcing the skeleton structure and improving the hardness and strength of the gel.

The dopant graphene and the silicon carbide clusters are dispersed in the silica gel network and mutually repel each other, so that the whole silica gel network framework becomes loose, and the solid phase heat conduction of the aerogel is reduced to a certain extent; the dopants graphene and silicon carbide have wide spectrum absorption, especially strong infrared heat radiation absorption, so that the radiation heat conduction of the aerogel is reduced; with the addition of the doping agents graphene and silicon carbide, the density of the aerogel is increased, the aperture is reduced, and the gas phase heat conduction of the aerogel is reduced; to sum up, the dopant graphene and the silicon carbide act synergistically in the silica gel, so that solid-phase heat conduction, radiant heat conduction and gas-phase heat conduction are all reduced, the total heat conductivity of the composite aerogel is reduced, and the heat preservation and insulation performance is greatly improved.

The silanization reagent is at least one of trimethyl chlorosilane, vinyl trimethoxy silane and methyl trimethoxy silane. Preferably, the silylating agent is vinyltrimethoxysilane and/or methyltrimethoxysilane; further preferably, the silylation agent is vinyltrimethoxysilane and methyltrimethoxysilane in a mass ratio of 1: (3-5). The silanization reagent has the function of alkylation, so that the hydrophobicity of the aerogel is changed and the heat preservation and insulation performance is improved.

	CAS number
		Tetraethoxysilane	78-10-4
Graphene	1034343-98-0
		Silicon carbide	409-21-2
Trimethylchlorosilane	4668-00-2
		Vinyl trimethoxy silane	2768-02-7
Methyltrimethoxysilane	1185-55-3

The graphene is prepared from XF001W single-layer graphene powder (physical method), and has a sheet diameter of 0.5-5 μm and a single-layer rate of 0.8 nm.

The silicon carbide is made of Nangong-Ci-Suiya alloy welding material, Inc., the trade name of NYT-SiC-01, and the grain diameter of the crystal is 0.01 mm.