阅读说明：本技术 一种保温隔热涂料的制备方法 (Preparation method of heat-preservation and heat-insulation coating ) 是由 不公告发明人 于 2017-08-01 设计创作，主要内容包括：本发明公开了一种保温隔热涂料的制备方法,该保温隔热涂料硅酸钙粉、填料、粘结剂、二氧化硅气凝胶、聚酰亚胺粉末、聚氨酯预聚体、固化剂、添加剂配置而成,制备方法包括：按照配合比设计将硅酸钙粉和填料,干混均匀成为混合料A,将按照配合比设计量配制好的粘结剂,逐渐加入混合料A中并搅拌均匀制得组分A；按照配合比设计称取聚氨酯预聚体、聚酰亚胺粉末、二氧化硅气凝胶和固化剂,将聚氨酯和二氧化硅气凝胶混合搅拌均匀成混合料B后,加入固化剂搅拌均匀制得组分B；将组分A与组分B混合并加入添加剂搅拌均匀,本发明所制得的硅酸钙保温隔热涂料环保且具有良好的附着力和保温隔热性能,是一种极具发展潜力的绿色建材。(The invention discloses a preparation method of a heat-preservation and heat-insulation coating, which is prepared from calcium silicate powder, a filler, a binder, silicon dioxide aerogel, polyimide powder, a polyurethane prepolymer, a curing agent and an additive, wherein the preparation method comprises the following steps: calcium silicate powder and a filler are designed according to a mixing proportion and are dry-mixed uniformly to form a mixture A, and a binder prepared according to the design amount of the mixing proportion is gradually added into the mixture A and is uniformly stirred to prepare a component A; weighing polyurethane prepolymer, polyimide powder, silica aerogel and curing agent according to the mix proportion, mixing and stirring the polyurethane and the silica aerogel uniformly to form a mixture B, adding the curing agent, and stirring uniformly to obtain a component B; the component A and the component B are mixed, and the additive is added and uniformly stirred, so that the prepared calcium silicate heat-insulating coating is environment-friendly, has good adhesive force and heat-insulating property, and is a green building material with great development potential.)

1. A preparation method of a heat-preservation and heat-insulation coating is characterized by comprising the following steps: the coating is prepared from the following raw materials in parts by mass:

50 parts of calcium silicate powder

Filler 20 ~ 40 parts

10 parts of 10 ~ 25 parts of adhesive agent,

10-20 parts of silicon dioxide aerogel

5-10 parts of polyimide powder

8-15 parts of polyurethane prepolymer

4-8 parts of curing agent

0.5-2 parts of an additive;

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

step 1), preparing raw materials;

step 2), calcium silicate powder and filler are designed according to the mixing proportion and are dry-mixed uniformly to form a mixture A, and the binder prepared according to the design amount of the mixing proportion is gradually added into the mixture A and is stirred uniformly to prepare a component A;

step 3), weighing the polyurethane prepolymer, the polyimide powder, the silica aerogel and the curing agent according to the mixing proportion, mixing and stirring the polyurethane and the silica aerogel uniformly to form a mixture B, and adding the curing agent and stirring uniformly to obtain a component B;

step 4), mixing the component A prepared in the step 2) with the component B prepared in the step 3), adding an additive, and uniformly stirring.

2. The preparation method according to claim 1, characterized in that the calcium silicate powder is finer than 200 mesh.

3. The preparation method of claim 1, wherein the filler is dihydrate gypsum or putty powder, the binder is one of sodium carboxymethylcellulose and polyvinyl alcohol, the concentration is 5 wt% ~ 10 wt%, and the additive is one or more of water repellent agent and antioxidant.

4. The method according to claim 1, characterized in that it is carried out by using the following steps:

a. preparation of silica sol: diluting silica sol with water to obtain a silica sol aqueous solution with SiO2 concentration of 5-10 wt%, adjusting the pH of the silica sol aqueous solution to 10.5-11.0 by using 15 wt% ammonia water, adding 50 wt% nitric acid to perform polycondensation on the silica sol aqueous solution, and aging at the temperature of 30-45 ℃ for 48-72 h;

b. solvent replacement: replacing water in the sol aged in the step a by butanone or absolute ethyl alcohol;

c. supercritical drying: and c, performing supercritical drying on the gel obtained in the step b to obtain the silicon dioxide aerogel.

5. The preparation method of claim 1, wherein the preparation method of the polyurethane prepolymer is realized by the following steps:

① mixing isocyanate and polyether polyol with an organic solvent in a reactor, and then adding a catalyst, wherein the mol ratio of-NCO in the isocyanate to-OH of the polyether polyol is 0.75-0.9: 1, the functionality of the polyether polyol is 2-3, the molecular weight is 1500-3000, the organic solvent is one or more of DMF and ethyl acetate, the using amount of the organic solvent is 80-120% of the total mass of the isocyanate and the polyether polyol, the catalyst is stannous octoate, and the using amount of the catalyst is 0.5-1% of the total mass of the isocyanate and the polyether polyol;

② introducing nitrogen into the reactor, heating and stirring to react at 65-75 deg.C for 2-3 h, and sealing for storage.

6. The method according to claim 1, wherein the curing agent is an isocyanate curing agent.

Technical Field

The invention relates to a preparation method of a heat-insulating coating, belonging to the technical field of heat-insulating coatings.

Background

The calcium silicate has the advantages of high strength, good heat resistance, good heat insulation effect, good use performance such as fire-releasing, flame-retardant property, aging resistance and the like, and the prepared heat insulation material has unique advantages. Calcium silicate thermal insulation materials have been recognized as a good building energy-saving material in hard thermal insulation materials, and have the characteristics of small density, high heat resistance, high bending resistance, high compressive strength, low thermal conductivity, small shrinkage rate and the like. After the 90 s, the development and popularization of the fiber have low tide, and the reason is that many manufacturers adopt paper pulp fibers. Although the problem of no asbestos is solved, the high temperature resistance and the breakage rate of the heat insulation material are influenced due to the characteristic that the paper pulp fiber is not resistant to high temperature, and the calcium silicate is an insoluble material and low in cohesiveness, so that the application of the calcium silicate in the coating is limited.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a preparation method of an environment-friendly calcium silicate heat-insulating coating, and the prepared calcium silicate heat-insulating coating can be well applied to the requirements of modern buildings, has good heat-insulating property, low production cost, simple preparation process, good adhesive force, long service life and good development prospect.

The technical scheme of the invention is realized as follows:

a preparation method of a heat-preservation and heat-insulation coating is characterized by comprising the following steps: the coating is prepared from the following raw materials in parts by mass:

50 parts of calcium silicate powder

20-40 parts of filler

10-25 parts of a binder,

10-20 parts of silicon dioxide aerogel

5-10 parts of polyimide powder

8-15 parts of polyurethane prepolymer

4-8 parts of curing agent

0.5-2 parts of additive

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

step 1), preparing raw materials;

step 2), calcium silicate powder and filler are designed according to the mixing proportion and are dry-mixed uniformly to form a mixture A, and the binder prepared according to the design amount of the mixing proportion is gradually added into the mixture A and is stirred uniformly to prepare a component A;

step 3), weighing the polyurethane prepolymer, the polyimide powder, the silicon dioxide aerogel and the curing agent according to the mixing proportion design, mixing and stirring the polyurethane, the polyimide powder and the silicon dioxide aerogel uniformly to obtain a mixture B, and adding the curing agent and stirring uniformly to obtain a component B;

step 4), mixing the component A prepared in the step 2) with the component B prepared in the step 3), adding an additive, and uniformly stirring.

Preferably, the fineness of the calcium silicate powder is less than 200 meshes.

Preferably, the filler is dihydrate gypsum or putty powder; the binder is one of sodium carboxymethylcellulose and polyvinyl alcohol, the concentration of the binder is 5-10 wt%, and the additive is one or more of a water repellent agent and an antioxidant.

Preferably, the preparation method of the silica aerogel is realized by adopting the following steps: a. Preparation of silica sol: diluting silica sol with water to obtain a silica sol aqueous solution with SiO2 concentration of 5-10 wt%, adjusting the pH of the silica sol aqueous solution to 10.5-11.0 by using 15 wt% ammonia water, adding 50 wt% nitric acid to perform polycondensation on the silica sol aqueous solution, and aging at the temperature of 30-45 ℃ for 48-72 h;

b. solvent replacement: replacing water in the sol aged in the step a by butanone or absolute ethyl alcohol;

c. supercritical drying: and c, performing supercritical drying on the gel obtained in the step b to obtain the silicon dioxide aerogel.

Preferably, the preparation method of the polyurethane prepolymer is realized by adopting the following steps:

① mixing isocyanate and polyether polyol with an organic solvent in a reactor, and then adding a catalyst, wherein the molar ratio of-NCO in the isocyanate to-OH of the polyether polyol is 0.75-0.9: 1, the functionality of the polyether polyol is 2-3, the molecular weight is 1500-3000, the organic solvent is one or more of DMF and ethyl acetate, the using amount of the organic solvent is 80-120% of the sum of the masses of the isocyanate and the polyether polyol, the catalyst is stannous octoate, and the using amount of the catalyst is 0.5-1% of the sum of the masses of the isocyanate and the polyether polyol;

② introducing nitrogen into the reactor, heating and stirring to react at 65-75 deg.C for 2-3 h, and sealing for storage;

preferably, the curing agent is an isocyanate curing agent.

Compared with the traditional coating, the invention has the following advantages:

1. the invention has low energy consumption and simple process;

2. the heat-insulating coating prepared by the invention has good adhesive force and heat-insulating property, and long service life, and is a green building material with great development potential.

Detailed Description

The invention is further illustrated by the following examples: