阅读说明：本技术 水性防酸雨建筑涂料 (Water-based acid rain-proof building coating ) 是由 何生才 黄银贤 池钟慷 黄海媛 黄银庆 于 2019-01-14 设计创作，主要内容包括：本发明涉及一种水性防酸雨建筑涂料,包括组份：硅酸钾、乳液、缓释碱气凝胶、助剂,其中所述的缓释碱气凝胶为经干燥的碱性溶液和亲水型二氧化硅气凝胶粉末的混合物。本发明的有益效果在于：提高了在国内酸雨分布区域建筑外墙涂料抗酸性物质破坏的能力,延长了涂料的使用寿命,相应保护了建筑物不被酸雨破坏。(The invention relates to a water-based acid rain-proof building coating, which comprises the following components: the slow-release alkali aerogel comprises potassium silicate, emulsion, slow-release alkali aerogel and an auxiliary agent, wherein the slow-release alkali aerogel is a mixture of dried alkaline solution and hydrophilic silica aerogel powder. The invention has the beneficial effects that: the capability of the building exterior wall coating to be damaged by acid rain in the domestic acid rain distribution area is improved, the service life of the coating is prolonged, and the building is correspondingly protected from being damaged by acid rain.)

1. The water-based acid rain-proof building coating is characterized by comprising the following components: the slow-release alkali aerogel comprises potassium silicate, emulsion, slow-release alkali aerogel and an auxiliary agent, wherein the slow-release alkali aerogel is a mixture of dried alkaline solution and hydrophilic silica aerogel powder.

2. The water-based acid rain resistant architectural coating of claim 1, wherein the potassium silicate is a potassium silicate solution having a modulus of 2.4 to 4.0.

3. The water-based acid rain resistant building coating as claimed in claim 1, wherein the slow-release alkali aerogel is a mixture of dried alkali solution and hydrophilic silica aerogel powder, and the mass ratio of the alkali solution to the hydrophilic silica aerogel powder is 4: 1; the mass concentration of the alkaline solution is 2%.

4. The water-based acid rain resistant building coating according to claim 1, characterized by comprising the following components in percentage by mass: 3.0 to 8.0 percent of potassium silicate, 15.0 to 25.0 percent of emulsion, 10.0 to 20.0 percent of slow-release alkali aerogel and auxiliary agent.

5. The aqueous acid rain resistant architectural coating of claim 1 wherein the adjuvant comprises one or more of an anti-freeze agent, a film forming adjuvant, a dispersing wetting agent, a stabilizer, a defoamer, a thickener, a cellulose ether.

6. The aqueous acid rain resistant building coating of claim 5 wherein the pigment and filler comprises calcium carbonate, barium sulfate and rutile titanium dioxide.

7. The aqueous acid rain resistant architectural coating of claim 1 wherein said alkaline solution is a sodium hydroxide solution.

Technical Field

The invention relates to the technical field of coatings, in particular to a building coating, and specifically relates to a water-based acid rain-proof building coating.

Background

Because human beings use a large amount of fuels such as coal, petroleum and natural gas with high sulfur content, gases containing sulfur dioxide and the like generated after combustion are combined with rainwater and the like in the air and fall to the ground to become acid rain after complex chemical reaction in the atmosphere; acid rain is highly corrosive and can corrode buildings, bridges, marble statues, cause trees to wilt, and the like.

The main distribution areas of the acid rain in China are the Sichuan basin, Guizhou, Hunan, Hubei and Jiangxi in the south of the Yangtze river, and the Fujian, Guangdong provinces in the coast. The development of acid rain resistant building protective coating and the application thereof to the decoration of the outer wall of a building are one of the methods for protecting the outer wall of the building in an acid rain distribution area.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide the water-based acid rain-proof building coating which can reduce the damage of acid substances to the coating and prolong the service life of the coating.

In order to achieve the aim, the water-based acid rain-proof building coating comprises the following components: the slow-release alkali aerogel comprises potassium silicate, emulsion, slow-release alkali aerogel and an auxiliary agent, wherein the slow-release alkali aerogel is a mixture of dried alkaline solution and hydrophilic silica aerogel powder.

Preferably, the potassium silicate is a potassium silicate solution with a modulus of 2.4-4.0.

Preferably, the slow-release alkali aerogel is a mixture of a dried alkaline solution and hydrophilic silica aerogel powder, and the mass ratio of the alkaline solution to the hydrophilic silica aerogel powder is 4: 1; the mass concentration of the alkaline solution is 2.0%.

Preferably, the composition comprises the following components in percentage by mass: 3.0 to 8.0 percent of potassium silicate, 15.0 to 25.0 percent of emulsion, 10.0 to 20.0 percent of slow-release alkali aerogel and auxiliary agent.

Preferably, the auxiliary agent comprises one or more of an antifreezing agent, a film forming auxiliary agent, a dispersing and wetting agent, a stabilizing agent, a defoaming agent, a thickening agent and cellulose ether.

Preferably, the pigment and filler comprises calcium carbonate, barium sulfate and rutile titanium dioxide.

Preferably, the auxiliary agent comprises one or more of the following components in percentage by mass: 1.0 to 1.5 percent of antifreeze, 1.5 to 3.0 percent of film forming additive, 15.0 to 25.0 percent of calcium carbonate, 3.0 to 8.0 percent of barium sulfate, 15.0 to 25.0 percent of rutile titanium dioxide, 0.3 to 0.5 percent of dispersing wetting agent, 0.3 to 0.8 percent of stabilizer, 0.3 to 0.8 percent of defoaming agent, 0.2 to 0.6 percent of thickening agent and 0.1 to 0.4 percent of cellulose ether.

Preferably, the emulsion is styrene modified acrylic emulsion.

Preferably, the calcium carbonate is ground calcium carbonate; the barium sulfate is precipitated barium sulfate.

Preferably, the stabilizer is a silicate dispersion stabilizer.

Preferably, the alkaline solution is sodium hydroxide solution.

The invention has the beneficial effects that: the capability of the building exterior wall coating to be damaged by acid rain in the domestic acid rain distribution area is improved, the service life of the coating is prolonged, and the building is correspondingly protected from being damaged by acid rain.

Detailed Description

In order that the technical contents of the present invention can be more clearly understood, the following further description is given of a specific embodiment of the present invention.

In order to solve the problem that the building exterior wall coating in an acid rain distribution area is easy to be eroded by acid rain, the invention provides an architectural coating product which has the function of slowly releasing alkalinity so as to neutralize the acid rain and can reduce the damage of the acid rain. Hydrophilic silica aerogel is adopted to adsorb alkaline substances and is used in a coating formula, and after construction, the coating can slowly release alkaline liquor to neutralize acidic substances in acid rain when being sprayed by the acid rain, so that the damage of the acidic substances to the coating is reduced, and the service life of the coating is prolonged.

Wherein, the basic composition of the slow release agent is exemplified as follows:

2% NaOH solution: 80 percent of

Hydrophilic silica aerogel: 20 percent of

The preparation method of the sustained-release agent comprises the following steps: firstly preparing 2% NaOH aqueous solution, then adding hydrophilic silicon dioxide aerogel powder under slow stirring, wherein the aerogel powder accounts for about 20% of the total amount, soaking for 24 hours, and drying and dehydrating for later use.

Wherein, the silicon dioxide aerogel is a commercial product, such as AP of Shaoxinuo technologies, Inc. in Zhejiang.

The invention provides a slow-release alkaline acid rain-proof coating which comprises the following components in percentage by mass:

the emulsion is preferably a styrene modified acrylic emulsion, preferably a basf emulsion 296DS, 502 emulsion.

The potassium silicate is an inorganic film forming substance, has high alkalinity and acid resistance, and can improve the acid and alkali resistance of a coating film and the alkalinity of a liquid coating by adopting the silicate so as to prevent the alkali in the silicon dioxide aerogel from being separated out too early; preferably, a solution of potassium silicate having a modulus of 2.4 to 4.0 is used, and the preferred lithium salt of magnesium silicate is KS7675 available from BASF.

The calcium carbonate is heavy calcium carbonate, preferably CC700 of Banana Ling Guangfu.

The barium sulfate is precipitated barium sulfate, preferably 298-BT of Shanghai Yu Tong chemical engineering.

The film-forming assistant is film-forming assistant Texanol of Istman chemical company (EASTMAN).

The anti-freezing agent can be selected from anti-freezing agents conventionally used in the coating field, and is preferably propylene glycol.

The water is deionized water.

The dispersing wetting agent can be one or more of a dispersing wetting agent 4140 of basf and CA2500 of Dow chemical.

The stabilizer is silicate dispersion stabilizer, such as SPS and SPV of Craine chemical, and L ycoquant of Basff chemical.

The defoaming agent can be selected from defoaming agents conventionally used in the field of coatings, and can be one or more of defoaming agents 2155 and 2190 in basf chemical industry.

The thickener can be polyurethane thickener conventionally used in the field, and can be thickener 1251 of basf chemical industry.

The cellulose ether is hydroxyethyl cellulose ether or hydrophobically modified cellulose ether commonly used in the field, and can be one or more of Yashilan HBR250 and Xinyue HS30000YP 2.

The preparation method of the water-based acid rain-proof building coating can adopt the preparation method of the conventional exterior wall coating in the field.

The preparation method comprises the following steps:

according to the formula, deionized water, cellulose, a wetting dispersant and a defoaming agent are added into a production kettle, a high-speed dispersing machine is used for stirring uniformly, pigment and filler and silica aerogel after alkali treatment are added under stirring and dispersed at a high speed until the fineness is below 60 mu m, emulsion, a film forming aid, an antifreezing agent and a thickening agent are added under the stirring rotating speed of 500rpm, potassium silicate and a silicate dispersion stabilizer are added under stirring after uniform mixing, and the mixture is stirred slowly for 5-10 minutes.

The sources of raw materials used in the following examples:

aqueous emulsion: 296DS emulsion of basf chemical;

HEC cellulose: german believes HS30000YP2 hydroxyethyl cellulose, supplied by australia, shanghai;

polyurethane thickener: basf chemical 1251, offered by Shanghai Tihe Row trade;

wetting and dispersing agent: sodium acrylate salt 4140 from basf chemical;

defoaming agent: 2155 of basf chemical;

film-forming auxiliary agent: texanol chemical USA;

an antifreezing agent: (ii) propylene glycol of the dow chemical type;

pigment: climbing steel R298 titanium dioxide;

calcium carbonate: canna lingguanfu heavy calcium carbonate CC 700;

barium sulfate: 298-BT of Shanghai Yutong chemical technology

Alkali-treated silica aerogel: self-making;

potassium silicate solution: basf chemical KS 7675;

silicate dispersion stabilizer: SPS of clariant chemistry;

deionized water: and (4) self-making.