阅读说明：本技术 一种建筑外墙用抗老化涂料及其制备方法 (Anti-aging coating for building exterior wall and preparation method thereof ) 是由 代群 张亮 范金龙 刘文秀 于 2020-08-03 设计创作，主要内容包括：本发明公开了一种建筑外墙用抗老化涂料及其制备方法,该抗老化涂料由如下重量份原料制成：丙烯酸乳液100-120份、分散剂1-1.5份、消泡剂0.5-0.8份、钛白粉3-3.5份、滑石粉12-15份、高岭土粉10-13份、云母粉10-13份、紫外线吸收剂2-3份；并在制备抗老化涂料的过程中制备了一种紫外线吸收剂,该紫外线吸收剂苯环上的羟基氢和羰基氧之间形成分子内氢键构成一个螯合环,当受到光照时,涂料吸收紫外线使得紫外线吸收剂分子发生热振动,进而使得分子内氢键破裂,螯合环打开,将紫外光能转化为热能释放,多个分子内氢键配合,使得该抗老化涂料的抗氧化能力提升,增加了涂料的使用寿命。(The invention discloses an anti-aging coating for building exterior walls and a preparation method thereof, wherein the anti-aging coating is prepared from the following raw materials in parts by weight: 100-120 parts of acrylic emulsion, 1-1.5 parts of dispersant, 0.5-0.8 part of defoamer, 3-3.5 parts of titanium dioxide, 12-15 parts of talcum powder, 10-13 parts of kaolin powder, 10-13 parts of mica powder and 2-3 parts of ultraviolet absorbent; and an ultraviolet absorbent is prepared in the process of preparing the anti-aging coating, intramolecular hydrogen bonds are formed between hydroxyl hydrogen on a benzene ring of the ultraviolet absorbent and carbonyl oxygen to form a chelate ring, when the ultraviolet absorbent is illuminated, the coating absorbs ultraviolet rays to enable the molecules of the ultraviolet absorbent to generate thermal vibration, further the intramolecular hydrogen bonds are broken, the chelate ring is opened, ultraviolet light energy is converted into heat energy to be released, the intramolecular hydrogen bonds are matched, the anti-oxidation capacity of the anti-aging coating is improved, and the service life of the coating is prolonged.)

1. An anti-aging coating for building exterior walls is characterized in that: the feed is prepared from the following raw materials in parts by weight: 100-120 parts of acrylic emulsion, 1-1.5 parts of dispersant, 0.5-0.8 part of defoamer, 3-3.5 parts of titanium dioxide, 12-15 parts of talcum powder, 10-13 parts of kaolin powder, 10-13 parts of mica powder and 2-3 parts of ultraviolet absorbent;

the anti-aging coating is prepared by the following steps:

step S1: adding titanium dioxide, talcum powder, kaolin powder and mica powder into a crusher for crushing, and mixing after passing through a 1250-plus-1300-mesh screen to prepare a mixture;

step S2: adding half of the acrylic emulsion, the mixture prepared in the step S1 and the dispersing agent into a reaction kettle, stirring for 20-30min under the condition of 800-1000r/min, adding the other half of the acrylic emulsion and the ultraviolet absorbent, and continuously stirring for 10-15min to prepare a mixed base solution;

step S3: and (5) adding the mixed base liquid prepared in the step S2 and the defoaming agent into a reaction kettle, and stirring for 30-50min under the condition that the rotating speed is 300-400r/min to prepare the anti-aging coating.

2. The anti-aging coating for the exterior wall of the building as claimed in claim 1, wherein: the dispersing agent is one or more of sodium oleate, sodium sulfonate and calcium sulfonate which are mixed in any proportion, and the defoaming agent is one or two of polydimethylsiloxane and ethylene glycol siloxane which are mixed in any proportion.

3. The anti-aging coating for the exterior wall of the building as claimed in claim 1, wherein: the ultraviolet absorbent is prepared by the following steps:

step A1: adding o-chlorotoluene and bis (2-chloroethyl) ether into a reaction kettle, stirring at the rotation speed of 100-150r/min until the o-chlorotoluene and the bis (2-chloroethyl) ether are uniformly mixed, adding anhydrous zinc chloride, reacting at the temperature of 35-40 ℃ for 1-1.5h to obtain an intermediate 1, mixing the intermediate 1 and benzene to obtain a mixed solution, adding sodium cyanide and deionized water into the reaction kettle, stirring until the sodium cyanide is completely dissolved, dropwise adding the mixed solution for 3-5min, and reacting at the temperature of 85-90 ℃ for 2-2.5h to obtain an intermediate 2;

step A2: adding the intermediate 2 prepared in the step A1 and liquid bromine into a reaction kettle, reacting for 1-1.5h under the condition of illumination to prepare an intermediate 3, adding the intermediate 3 into the reaction kettle, dropwise adding a sodium hydroxide solution at the rotation speed of 150-;

step A3: adding the intermediate 4 prepared in the step A2, deionized water, sodium hydroxide powder and copper powder into a reaction kettle, stirring until the mixture is uniformly mixed, reacting for 8-10h under the conditions that the temperature is 260-270 ℃ and the pressure is 4.5-5.0MPa, filtering to remove a filtrate, dropwise adding a hydrochloric acid solution into the filtrate until the pH value is 1-2, and then adding methanol for reacting for 30-40min to prepare an intermediate 5;

step A4: uniformly mixing p-chloro-o-nitroaniline, the intermediate 5 prepared in the step A3, sodium nitrite and potassium bisulfate, grinding for 20-30min at the temperature of 25-30 ℃ to obtain an intermediate 5, adding the intermediate 5, ethanol and a sodium hydroxide solution into a reaction kettle, stirring until the mixture is uniform, heating to reflux at the temperature of 80-85 ℃, adding sodium hydrosulfite, reacting for 1-1.5h at the rotation speed of 300-500r/min, cooling to room temperature, adding a hydrochloric acid solution until the pH value is 3-4, and filtering to remove filtrate to obtain an intermediate 6;

step A5: mixing m-diphenol and an ethanol water solution to prepare a m-diphenol reaction liquid, mixing the intermediate 6 prepared in the step A4 with benzene to prepare an intermediate 6 reaction liquid, adding the m-diphenol reaction liquid into a reaction kettle, dropwise adding the intermediate 6 reaction liquid under the conditions that the rotation speed is 150-200r/min and the temperature is 45-50 ℃, wherein the dropwise adding time is 1-1.5h, and continuously reacting for 1.5-2h after the dropwise adding is finished to prepare the ultraviolet absorbent.

4. The anti-aging coating for the exterior wall of the building as claimed in claim 3, wherein: the dosage amount substance ratio of the o-chlorotoluene and the bis (2-chloroethyl) ether in the step A1 is 1:1-1.2, the dosage of the anhydrous zinc chloride is 3-5% of the total mass of the o-chlorotoluene and the bis (2-chloroethyl) ether, and the dosage amount substance ratio of the intermediate 1 and the sodium cyanide is 5: 4.

5. The anti-aging coating for the exterior wall of the building as claimed in claim 3, wherein: the mass ratio of the intermediate 2 to the liquid bromine in the step A2 is 1:3, and the mass ratio of the intermediate 3 to the sodium hydroxide solution is 4 g: 3mL, and the mass fraction of the sodium hydroxide solution is 30-35%.

6. The anti-aging coating for the exterior wall of the building as claimed in claim 3, wherein: the mass ratio of the intermediate 4, the deionized water, the sodium hydroxide powder and the copper powder in the step A3 is 10:8:5:0.2-0.4, and the mass fraction of the hydrochloric acid solution is 60-65.

7. The anti-aging coating for the exterior wall of the building as claimed in claim 3, wherein: the dosage ratio of the p-chloro-o-nitroaniline, the intermediate 5, the sodium nitrite and the potassium bisulfate in the step A4 is 1:1-1.2:1:1, the dosage ratio of the intermediate 6, the ethanol, the sodium hydroxide solution and the sodium hydrosulfite is 4 g: 25mL of: 25mL of: 8 g.

8. The anti-aging coating for the exterior wall of the building as claimed in claim 3, wherein: the amount of resorcinol and intermediate 7 used in step A5 was 1: 1.05.

9. The preparation method of the anti-aging coating for the exterior wall of the building, according to claim 1, is characterized in that: the method specifically comprises the following steps:

step S1: adding titanium dioxide, talcum powder, kaolin powder and mica powder into a crusher for crushing, and mixing after passing through a 1250-plus-1300-mesh screen to prepare a mixture;

step S2: adding half of the acrylic emulsion, the mixture prepared in the step S1 and the dispersing agent into a reaction kettle, stirring for 20-30min under the condition of 800-1000r/min, adding the other half of the acrylic emulsion and the ultraviolet absorbent, and continuously stirring for 10-15min to prepare a mixed base solution;

step S3: and (5) adding the mixed base liquid prepared in the step S2 and the defoaming agent into a reaction kettle, and stirring for 30-50min under the condition that the rotating speed is 300-400r/min to prepare the anti-aging coating.

Technical Field

The invention belongs to the technical field of building coating preparation, and particularly relates to an anti-aging coating for a building outer wall and a preparation method thereof.

Background

The coating is a substance which can form a complete film and can be firmly adhered to the surface of an object, the early coating is mainly made of natural animal fat, vegetable fat, natural resin and the like, so the coating is also called as paint, the rapid development of the worldwide petrochemical industry and the polymer synthesis industry since the 20 th century and the 50 th year provides a good material basis for the development of the coating industry, and therefore, the current coating mainly uses synthetic resin as a film-forming substance except a small amount of natural resin and fat.

The existing anti-aging coating for the building outer wall can be directly irradiated by sunlight in the using process, and the coating can generate photochemical reaction under the irradiation of the sunlight for a long time, so that the performance of the coating is greatly reduced, and the attractiveness of the coating is influenced.

Disclosure of Invention

The invention aims to provide an anti-aging coating for an exterior wall of a building and a preparation method thereof.

The technical problems to be solved by the invention are as follows:

the existing anti-aging coating for the building outer wall can be directly irradiated by sunlight in the using process, and the coating can generate photochemical reaction under the irradiation of the sunlight for a long time, so that the performance of the coating is greatly reduced, and the attractiveness of the coating is influenced.

The purpose of the invention can be realized by the following technical scheme:

an anti-aging coating for building exterior walls is prepared from the following raw materials in parts by weight: 100-120 parts of acrylic emulsion, 1-1.5 parts of dispersant, 0.5-0.8 part of defoamer, 3-3.5 parts of titanium dioxide, 12-15 parts of talcum powder, 10-13 parts of kaolin powder, 10-13 parts of mica powder and 2-3 parts of ultraviolet absorbent;

the anti-aging coating is prepared by the following steps:

step S1: adding titanium dioxide, talcum powder, kaolin powder and mica powder into a crusher for crushing, and mixing after passing through a 1250-plus-1300-mesh screen to prepare a mixture;

step S2: adding half of the acrylic emulsion, the mixture prepared in the step S1 and the dispersing agent into a reaction kettle, stirring for 20-30min under the condition of 800-1000r/min, adding the other half of the acrylic emulsion and the ultraviolet absorbent, and continuously stirring for 10-15min to prepare a mixed base solution;

step S3: and (5) adding the mixed base liquid prepared in the step S2 and the defoaming agent into a reaction kettle, and stirring for 30-50min under the condition that the rotating speed is 300-400r/min to prepare the anti-aging coating.

Further, the dispersing agent is one or more of sodium oleate, sodium sulfonate and calcium sulfonate which are mixed in any proportion, and the defoaming agent is one or two of polydimethylsiloxane and ethylene glycol siloxane which are mixed in any proportion.

Further, the ultraviolet absorbent is prepared by the following steps:

step A1: adding o-chlorotoluene and bis (2-chloroethyl) ether into a reaction kettle, stirring at the rotation speed of 100-150r/min until the o-chlorotoluene and the bis (2-chloroethyl) ether are uniformly mixed, adding anhydrous zinc chloride, reacting at the temperature of 35-40 ℃ for 1-1.5h to obtain an intermediate 1, mixing the intermediate 1 and benzene to obtain a mixed solution, adding sodium cyanide and deionized water into the reaction kettle, stirring until the sodium cyanide is completely dissolved, dropwise adding the mixed solution for 3-5min, and reacting at the temperature of 85-90 ℃ for 2-2.5h to obtain an intermediate 2;

the reaction process is as follows:

step A2: adding the intermediate 2 prepared in the step A1 and liquid bromine into a reaction kettle, reacting for 1-1.5h under the condition of illumination to prepare an intermediate 3, adding the intermediate 3 into the reaction kettle, dropwise adding a sodium hydroxide solution at the rotation speed of 150-;

the reaction process is as follows:

step A3: adding the intermediate 4 prepared in the step A2, deionized water, sodium hydroxide powder and copper powder into a reaction kettle, stirring until the mixture is uniformly mixed, reacting for 8-10h under the conditions that the temperature is 260-270 ℃ and the pressure is 4.5-5.0MPa, filtering to remove a filtrate, dropwise adding a hydrochloric acid solution into the filtrate until the pH value is 1-2, and then adding methanol for reacting for 30-40min to prepare an intermediate 5;

the reaction process is as follows:

step A4: uniformly mixing p-chloro-o-nitroaniline, the intermediate 5 prepared in the step A3, sodium nitrite and potassium bisulfate, grinding for 20-30min at the temperature of 25-30 ℃ to obtain an intermediate 6, adding the intermediate 6, ethanol and a sodium hydroxide solution into a reaction kettle, stirring until the mixture is uniform, heating to reflux at the temperature of 80-85 ℃, adding sodium hydrosulfite, reacting for 1-1.5h at the rotation speed of 300-500r/min, cooling to room temperature, adding a hydrochloric acid solution until the pH value is 3-4, and filtering to remove filtrate to obtain an intermediate 7;

the reaction process is as follows:

step A5: mixing m-diphenol and an ethanol water solution to prepare a m-diphenol reaction liquid, mixing the intermediate 7 prepared in the step A4 with benzene to prepare an intermediate 7 reaction liquid, adding the m-diphenol reaction liquid into a reaction kettle, dropwise adding the intermediate 7 reaction liquid under the conditions that the rotation speed is 150-200r/min and the temperature is 45-50 ℃, wherein the dropwise adding time is 1-1.5h, and continuously reacting for 1.5-2h after the dropwise adding is finished to prepare the ultraviolet absorbent.

The reaction process is as follows:

further, the amount ratio of the o-chlorotoluene to the bis (2-chloroethyl) ether used in the step A1 is 1:1-1.2, the amount of the anhydrous zinc chloride is 3-5% of the total amount of the o-chlorotoluene and the bis (2-chloroethyl) ether, and the amount ratio of the intermediate 1 to the sodium cyanide is 5: 4.

Further, the amount ratio of the intermediate 2 to the liquid bromine in the step A2 is 1:3, and the amount ratio of the intermediate 3 to the sodium hydroxide solution is 4 g: 3mL, and the mass fraction of the sodium hydroxide solution is 30-35%.

Further, the mass ratio of the intermediate 4, the deionized water, the sodium hydroxide powder and the copper powder in the step A3 is 10:8:5:0.2-0.4, and the mass fraction of the hydrochloric acid solution is 60-65.

Further, the dosage ratio of the p-chloro-o-nitroaniline, the intermediate 5, the sodium nitrite and the potassium bisulfate in the step A4 is 1:1-1.2:1:1, the dosage ratio of the intermediate 6, the ethanol, the sodium hydroxide solution and the sodium hydrosulfite is 4 g: 25mL of: 25mL of: 8 g.

Further, the amount of m-diphenol used in step A5 and intermediate 7 was 1: 1.05.

Further, the preparation method of the anti-aging coating for the building outer wall specifically comprises the following steps:

step S1: adding titanium dioxide, talcum powder, kaolin powder and mica powder into a crusher for crushing, and mixing after passing through a 1250-plus-1300-mesh screen to prepare a mixture;

step S2: adding half of the acrylic emulsion, the mixture prepared in the step S1 and the dispersing agent into a reaction kettle, stirring for 20-30min under the condition of 800-1000r/min, adding the other half of the acrylic emulsion and the ultraviolet absorbent, and continuously stirring for 10-15min to prepare a mixed base solution;

step S3: and (5) adding the mixed base liquid prepared in the step S2 and the defoaming agent into a reaction kettle, and stirring for 30-50min under the condition that the rotating speed is 300-400r/min to prepare the anti-aging coating.

The invention has the beneficial effects that: the invention prepares an ultraviolet absorbent in the process of preparing an anti-aging coating for the building outer wall, the main structure of the ultraviolet absorbent is similar to that of a phenylpropyl triazole ultraviolet absorbent, when the coating is illuminated, the molecule forms a six-membered ring by a hydroxyl hydrogen atom and a nitrogen atom on a triazole group, so that the structure has a hydrogen bond chelating ring, when the coating absorbs ultraviolet rays, the hydrogen bond is destroyed to change the molecular structure of the ultraviolet absorbent, so that light energy is converted into heat energy, meanwhile, a branched chain of the ultraviolet absorbent is a benzophenone analogue, the branched chain also has an intramolecular hydrogen bond, the intramolecular hydrogen bond formed between the hydroxyl hydrogen on the benzene ring and carbonyl oxygen forms a chelating ring, when the coating is illuminated, the coating absorbs ultraviolet rays to enable the ultraviolet absorbent molecule to vibrate thermally, so that the intramolecular hydrogen bond is broken, and the chelating ring is opened, ultraviolet light energy is converted into heat energy to be released, and a plurality of intramolecular hydrogen bonds are matched, so that the oxidation resistance of the anti-aging coating is improved, and the service life of the coating is prolonged.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.