阅读说明：本技术 一种具有超强耐候性的隔热涂料及其制备方法 (Heat insulation coating with super-strong weather resistance and preparation method thereof ) 是由 邱峰 于 2019-09-17 设计创作，主要内容包括：本发明公开了一种具有超强耐候性的隔热涂料,包括以下成分：分散剂、润湿剂、消泡剂、防腐剂、云母粉、白炭黑、轻质碳酸钙、水性聚氨酯树脂乳液、成膜助剂、羟乙基纤维素、颜料、增稠剂、改性二氧化钛复合材料和水。本发明的具有超强耐候性的隔热涂料,通过在涂料中加入改性二氧化钛复合材料,不但降低了空气中的有机物对二氧化钛的干扰,从而降低了涂料表面污染对二氧化钛反射效率的影响,而且通过壳聚糖对纳米二氧化钛的改性,可以显著提升二氧化钛的反射效率；在涂料中加入白炭黑和云母粉,可以显著提升涂料的耐候性能和耐酸雨性能；在涂料中加入大直径片状轻质碳酸钙,由于遮蔽效果好,从而可以进一步提升涂料的隔热性能。(The invention discloses a heat insulation coating with super weather resistance, which comprises the following components: the coating comprises a dispersing agent, a wetting agent, a defoaming agent, a preservative, mica powder, white carbon black, light calcium carbonate, an aqueous polyurethane resin emulsion, a film-forming auxiliary agent, hydroxyethyl cellulose, a pigment, a thickening agent, a modified titanium dioxide composite material and water. According to the heat-insulating coating with super-strong weather resistance, the modified titanium dioxide composite material is added into the coating, so that the interference of organic matters in the air on the titanium dioxide is reduced, the influence of surface pollution of the coating on the reflection efficiency of the titanium dioxide is reduced, and the reflection efficiency of the titanium dioxide can be remarkably improved by modifying the nano titanium dioxide through chitosan; the white carbon black and the mica powder are added into the paint, so that the weather resistance and the acid rain resistance of the paint can be obviously improved; the large-diameter flaky light calcium carbonate is added into the coating, and the heat insulation performance of the coating can be further improved due to the good shielding effect.)

1. The heat insulation coating with super weather resistance is characterized by comprising the following components: the coating comprises a dispersing agent, a wetting agent, a defoaming agent, a preservative, mica powder, white carbon black, light calcium carbonate, an aqueous polyurethane resin emulsion, a film-forming auxiliary agent, hydroxyethyl cellulose, a pigment, a thickening agent, a modified titanium dioxide composite material and water.

2. The heat-insulating coating with super weather resistance of claim 1, which is prepared from the following components in percentage by weight: 3-5% of a dispersing agent, 0.2-0.5% of a wetting agent, 0.5-1% of a defoaming agent, 0.3-0.8% of a preservative, 8-15% of mica powder, 2-5% of white carbon black, 6-10% of light calcium carbonate, 30-40% of an aqueous polyurethane resin emulsion, 8-12% of a film-forming assistant, 1-3% of hydroxyethyl cellulose, 1-5% of a pigment, 1-3% of a thickening agent, 2-5% of a modified titanium dioxide composite material and the balance of water.

3. The heat-insulating coating with super weather resistance as claimed in claim 1, wherein the light calcium carbonate is large-diameter flaky light calcium carbonate, the diameter of the large-diameter flaky light calcium carbonate is 4-10 μm, and the ratio of the diameter to the thickness is (20-50): 1.

4. the heat insulating coating with super weather resistance as claimed in claim 1, wherein the modified titanium dioxide composite material is a nano titanium dioxide/chitosan composite material.

5. A preparation method of a heat insulation coating with super weather resistance is characterized by comprising the following steps:

dissolving chitosan in an acetic acid solution to prepare a 10-20mg/L chitosan solution, slowly adding glutaraldehyde and tetrabutyl titanate under the constant temperature condition of 50-60 ℃, continuously stirring, then adding a sodium hydroxide solution to adjust the pH value, and continuously stirring to obtain a precursor solution of the microwave hydrothermal reaction; transferring the obtained precursor solution into a reaction kettle with a polytetrafluoroethylene lining, and then putting the reaction kettle into a microwave hydrothermal reaction instrument for hydrothermal reaction; after the reaction is finished, taking out the reaction kettle, carrying out suction filtration, washing the obtained filter cake, and drying at the constant temperature of 40-45 ℃ to obtain a nano titanium dioxide/chitosan compound;

step two, stirring the dispersing agent, the wetting agent and the water for 10-15min at the stirring speed of 350rpm of 250-15, adding the defoaming agent, continuously stirring for 8-15min, adjusting the stirring speed to 450rpm of 400-15, adding the mica powder, the white carbon black, the light calcium carbonate and the pigment, and continuously stirring for 20-30min to obtain slurry;

and step three, mixing the aqueous polyurethane resin emulsion, the film-forming auxiliary agent, the preservative and the hydroxyethyl cellulose at the stirring speed of 200-250rpm, stirring for 15-20min, adding the slurry, continuing to stir for 10-15min, adjusting the stirring speed to be 800rpm, adding the modified titanium dioxide composite material and the thickening agent, and continuing to stir for 45-60 min.

6. The method for preparing the thermal insulation coating with super weatherability as claimed in claim 5, wherein in the step of preparing the precursor liquid in the first step, the molar ratio of the chitosan structural unit to the glutaraldehyde is controlled to be 1: (2-4); the mass ratio of the chitosan to the nano titanium dioxide is 1: (15-25).

7. The method as claimed in claim 5, wherein the microwave hydrothermal reaction step in the first step has a reaction temperature of 150 ℃ and a temperature of 200 ℃ and a holding time of 120 ℃ and 150 min.

Technical Field

The invention relates to the technical field of heat insulation coatings, in particular to a heat insulation coating with super-strong weather resistance and a preparation method thereof.

Background

The heat insulation coating reduces the temperature of the roof and the wall surface by blocking heat transfer between the roof and the wall surface and the external environment, achieves the aim of reducing heat accumulation of buildings, can play a great role in the life of people in winter and summer, and has extremely wide market prospect.

However, the existing heat insulation coating in the current market also has the problems of low light reflection efficiency, poor heat insulation effect and the like. Meanwhile, the coating has poor weather resistance, the reflection efficiency cannot be continuously high due to the surface pollution of common coatings, and the coating is damaged by acid rain, so that the reflection efficiency is influenced. The development and application of the heat insulation coating are limited by the factors, so that the development of the high-efficiency heat insulation coating with the self-cleaning characteristic is very important.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a heat insulation coating with super-strong weather resistance and a preparation method thereof.

The technical scheme of the invention is as follows:

a heat insulation coating with super weather resistance comprises the following components: the coating comprises a dispersing agent, a wetting agent, a defoaming agent, a preservative, mica powder, white carbon black, light calcium carbonate, an aqueous polyurethane resin emulsion, a film-forming auxiliary agent, hydroxyethyl cellulose, a pigment, a thickening agent, a modified titanium dioxide composite material and water.

Preferably, the heat insulation coating with super weather resistance comprises the following components in percentage by weight: 3-5% of a dispersing agent, 0.2-0.5% of a wetting agent, 0.5-1% of a defoaming agent, 0.3-0.8% of a preservative, 8-15% of mica powder, 2-5% of white carbon black, 6-10% of light calcium carbonate, 30-40% of an aqueous polyurethane resin emulsion, 8-12% of a film-forming assistant, 1-3% of hydroxyethyl cellulose, 1-5% of a pigment, 1-3% of a thickening agent, 2-5% of a modified titanium dioxide composite material and the balance of water;

preferably, the light calcium carbonate is large-diameter flaky light calcium carbonate, the diameter of the large-diameter flaky light calcium carbonate is 4-10 μm, and the diameter-thickness ratio is (20-50): 1.

preferably, the modified titanium dioxide composite material is a nano titanium dioxide/chitosan composite material.

A preparation method of a heat insulation coating with super weather resistance comprises the following steps:

dissolving chitosan in an acetic acid solution to prepare a 10-20mg/L chitosan solution, slowly adding glutaraldehyde and tetrabutyl titanate under the constant temperature condition of 50-60 ℃, continuously stirring, then adding a sodium hydroxide solution to adjust the pH value, and continuously stirring to obtain a precursor solution of the microwave hydrothermal reaction; transferring the obtained precursor solution into a reaction kettle with a polytetrafluoroethylene lining, and then putting the reaction kettle into a microwave hydrothermal reaction instrument for hydrothermal reaction; after the reaction is finished, taking out the reaction kettle, carrying out suction filtration, washing the obtained filter cake, and drying at the constant temperature of 40-45 ℃ to obtain a nano titanium dioxide/chitosan compound;

step two, stirring the dispersing agent, the wetting agent and the water for 10-15min at the stirring speed of 350rpm of 250-15, adding the defoaming agent, continuously stirring for 8-15min, adjusting the stirring speed to 450rpm of 400-15, adding the mica powder, the white carbon black, the light calcium carbonate and the pigment, and continuously stirring for 20-30min to obtain slurry;

and step three, mixing the aqueous polyurethane resin emulsion, the film-forming auxiliary agent, the preservative and the hydroxyethyl cellulose at the stirring speed of 200-250rpm, stirring for 15-20min, adding the slurry, continuing to stir for 10-15min, adjusting the stirring speed to be 800rpm, adding the modified titanium dioxide composite material and the thickening agent, and continuing to stir for 45-60 min.

Preferably, in the step of preparing the precursor solution in the first step, the molar ratio of the chitosan structural unit to the glutaraldehyde is controlled to be 1: (2-4); the mass ratio of the chitosan to the nano titanium dioxide is 1: (15-25).

Preferably, in the microwave hydrothermal reaction step of the first step, the reaction temperature range is 150-.

The invention has the advantages that: according to the heat-insulating coating with super-strong weather resistance, firstly, the modified titanium dioxide composite material is added into the coating, and the material is generally used for adsorbing and degrading organic matters, modifying textile materials, keeping fresh and the like, so that the interference of the organic matters in the air to the titanium dioxide is reduced by utilizing the effect of adsorbing and degrading the organic matters, the influence of the surface pollution of the coating on the reflection efficiency of the titanium dioxide is reduced, and the reflection efficiency of the titanium dioxide can be remarkably improved by modifying the nano titanium dioxide through chitosan; secondly, the white carbon black and the mica powder are added into the coating, so that the weather resistance and the acid rain resistance of the coating can be obviously improved; thirdly, the large-diameter flaky light calcium carbonate is added, and the heat insulation performance of the coating can be further improved due to the good shielding effect.

Detailed Description