CN102093789B - Modified nano aluminium hydroxide water expansion type overcoating fire retardant paint and preparation method thereof - Google Patents

Abstract

The invention discloses a modified nano-aluminum hydroxide water-based intumescent fireproof coating for decorative surfaces and a preparation method thereof. It is prepared from the following raw materials by weight percentage: 22% to 28% of silicone-modified styrene-acrylic emulsion, 13% to 17% of a mixture of anatase titanium dioxide and modified nano-aluminum hydroxide powder, and 16% of ammonium polyphosphate %～19%, 8%～13% of melamine, 5%～9% of pentaerythritol, 3%～7% of additives, 21%～27% of water; the modified nano-aluminum hydroxide is composed of the following raw materials in parts by weight Prepared: 60-85 parts of nanometer aluminum hydroxide powder, 0.8-2.5 parts of sodium hexametaphosphate powder, and 18-24 parts of water. The invention has obvious flame retardant effect, high fireproof performance, good washing resistance, weather resistance and application hardness, low smoke generation, is a water-based system, has environmental protection and energy saving, simple production process, good dispersion effect, low cost, stable performance and long service life beneficial effect.

Description

Modified nano aluminum hydroxide water-based intumescent decorative fireproof coating and preparation method thereof

technical field

The invention relates to a fireproof coating, in particular to a modified nano-aluminum hydroxide water-based expansion type decorative fireproof coating and a preparation method thereof.

Background technique

The problem of fire has always attracted great attention from the Party Central Committee and the State Council. Comrade Jiang Zemin once instructed: "Hidden dangers are more dangerous than open flames, prevention is better than disaster relief, and responsibilities are heavier than Mount Tai." Relevant departments have also formulated laws and regulations on fire prevention, which will help reduce fires. Threats to people's lives and property, fire retardant coatings can effectively reduce fire losses. Most of the currently developed fire retardant coatings are prepared by adding nano-inorganic substances with high thermal stability. Resin: amine polyphosphate: nano-SiO2: pentaerythritol: butanol: titanium dioxide=200-400: 140-280: 30-70: 110-218: 86-135: 20-60. And the invention patent "Nanocomposite High Temperature Resistant Fireproof Coating" with publication number CN01136262.6 is given by nanometer silicon carbide, nanometer silicate clay, phosphate, oxide and nanometer aluminum silicate and other nanoparticles. Organic polymer materials are fire retardant coatings prepared by different composition, different phase structure, different content and different methods and intercalation composite method. Although they have a certain effect of fire retardancy and fire insulation. But their common disadvantage is that nano-inorganic substances do not undergo decomposition and endothermic reaction under high temperature, and have the defect of low flame retardant efficiency, so the utilization rate of raw materials is low, and the fire protection effect is poor.

Contents of the invention

Aiming at the above problems, the present invention provides an environmentally friendly and energy-saving modified nano-aluminum hydroxide water-based intumescent decorative surface fire prevention that undergoes decomposition reaction under high temperature, absorbs heat, significantly improves flame retardancy, increases fire prevention time, and has low smoke generation. Coatings and methods for their preparation.

The purpose of the present invention is achieved by the following technical solutions:

Modified nano-aluminum hydroxide water-based intumescent decorative fireproof coating, which is prepared from the following raw materials by weight percentage: 20% to 30% of silicone modified styrene-acrylic emulsion, anatase titanium dioxide and modified Mixture of nano aluminum hydroxide powder 10%~19%, ammonium polyphosphate 15%~21%, melamine 6%~16%, pentaerythritol 3%~10%, additive 2%~8%, water 20%~30% The modified nano-aluminum hydroxide is prepared from the following raw materials in parts by weight: 50-100 parts of nano-aluminum hydroxide powder, 0.5-3 parts of sodium hexametaphosphate powder, and 15-25 parts of water.

The modified nano-aluminum hydroxide water-based intumescent fireproof coating for finishes is prepared from the following raw materials by weight percentage: 22% to 28% of organic silicon-modified styrene-acrylic emulsion, anatase-type titanium dioxide Mixture with modified nano aluminum hydroxide powder 13%~17%, ammonium polyphosphate 16%~19%, melamine 8%~13%, pentaerythritol 5%~9%, additive 3%~7%, water 21% ~27%; the modified nano-aluminum hydroxide is prepared from the following raw materials in parts by weight: 60-85 parts of nano-aluminum hydroxide powder, 0.8-2.5 parts of sodium hexametaphosphate powder, 18-24 parts of water .

The modified nano-aluminum hydroxide is mixed with the anatase-type titanium dioxide by 5% to 10% by weight.

The auxiliary agents include dispersants, wetting agents, defoamers and film-forming aids.

The dispersant, wetting agent, defoamer and film-forming aid are prepared in a ratio of 1:1:1:0.5.

The dispersant is polyacrylic acid copolymer solution.

The wetting agent is polyethoxylate.

The defoamer is polysiloxane.

Described film-forming aid is ethylene glycol.

The process for preparing the modified nano-aluminum hydroxide water-based intumescent type finish fireproof coating comprises the following steps:

(a) Prepare modified nano-aluminum hydroxide powder: take the nano-aluminum hydroxide powder in a beaker according to the formula ratio, add water to make a slurry; place the slurry in a constant temperature water bath at 80°C-100°C ; Then add sodium hexametaphosphate, fully stir for 20-30min to obtain nano-aluminum hydroxide suspension; then filter, dry and grind the nano-aluminum hydroxide suspension to obtain pretreated modified nano-aluminum hydroxide powder;

(b) Preparation of auxiliary agent solution: add dispersant (polyacrylic acid copolymer solution), wetting agent (polyethoxylate) and defoamer (polysiloxane) into water according to the formula ratio, Stir evenly at a speed of 800-1700r/min for later use;

m以下时即可，最后加入有机硅改性的苯丙乳液，加入成膜助剂（乙二醇），以800-1700r/min的速度再搅拌15-20min后，静置即为成品，包装。 (c) Mixed finished product: take the above-mentioned spare additive solution, add the mixture of anatase titanium dioxide and modified nano-aluminum hydroxide powder according to the formula ratio, and proceed at a speed of 2000-3500r/min at the same time Stir for 15-20min; then add ammonium polyphosphate, melamine and pentaerythritol respectively and stir at a speed of 800-1700r/min for 10-15min, then enter the sand mill for sand grinding, and use a scraper fineness meter to measure the particle fineness to 90

When it is less than m, add silicone-modified styrene-acrylic emulsion, add film-forming aid (ethylene glycol), stir at a speed of 800-1700r/min for 15-20min, and let stand to be the finished product. Packaging .

Compared with the prior art, the present invention has the following advantages and effects: due to the addition of pretreated modified nano aluminum hydroxide, compared with ordinary aluminum hydroxide, the present invention has low dosage, good flame retardant effect and good dispersibility, especially It is when the decomposition and endothermic reaction occurs under the action of high temperature to generate alumina, which covers the surface of the carbonaceous layer to form an inorganic protective layer to absorb heat, which can significantly improve the flame retardant performance and improve the fire prevention time. The flame retardant time of the invented fire retardant coating can be increased by 20%-35%. And because the present invention adopts the silicone-modified styrene-acrylic emulsion with higher thermal stability as the base material, and the fireproof components are ammonium polyphosphate, melamine and pentaerythritol, so that the amount of modified nano-aluminum hydroxide after pretreatment is low The flame retardant effect is good, and the organic and inorganic composite fireproof coating is formed with the fireproof component. The hardness, water resistance and scrub resistance of the coating film are good. The hardness value of the present invention is measured by the BY type paint film pencil hardness tester through the coating film hardness test. for 2H-2B. In addition, the present invention not only has obvious flame retardant effect, high fire resistance performance, good washing resistance, weather resistance and application hardness, but also has low smoke generation and is a water-based system, which is environmentally friendly and energy-saving. The production process is simple, the dispersion effect is good, and the cost is low. The utility model has the beneficial effects of stable performance and long service life. It has good economic and social benefits, and is an ideal fireproof coating.

The use method of the present invention: before use, the outer wall surface should first be repaired, cleaned, filled with gaps, partially scraped putty, and smoothed. The time interval should not be less than 4 hours. In addition, the use process should be based on the use environment, brushing process and other factors, and the amount of brushing and brushing method should be adjusted according to the actual situation in order to obtain the best use effect.

Detailed ways

The present invention will be further described in detail below in conjunction with specific examples, but the protection scope of the present invention is not limited by the specific examples, and the claims shall prevail. In addition, on the premise of not violating the technical solution of the present invention, any modification or change made to the present invention that can be easily realized by those skilled in the art will fall within the scope of the claims of the present invention.

Example 1

m以下时即可，最后加入有机硅改性的苯丙乳液22 Kg，加入成膜助剂（乙二醇）0.5 Kg，以速度为800-1700r/min进行搅拌15-20min后，静置即为成品，包装。 (a) Preparation of modified nano-aluminum hydroxide powder: Take 50 Kg of nano-aluminum hydroxide powder, 2 Kg of sodium hexametaphosphate powder, and 16 Kg of water according to the formula ratio, first put the nano-aluminum hydroxide powder in a beaker, Add water to make a slurry; place the slurry in a constant temperature water bath at 80°C-100°C; then add sodium hexametaphosphate and stir thoroughly for 20-30min to prepare a nano-aluminum hydroxide suspension; (b) preparation of auxiliary agents : Take 3 Kg of dispersant (polyacrylic acid copolymer solution), wetting agent (polyethoxylate), defoamer (polysiloxane) according to the ratio of the formula, and add 23 In Kg water, stir evenly in a mixer at a speed of 800-1700r/min for later use; (c), mixed finished product: take the above auxiliary agent solution, add anatase titanium dioxide and modified nano-hydroxide according to the formula ratio The mixture of aluminum powder (modified nano-aluminum hydroxide is mixed with 5% of the weight of anatase titanium dioxide) 15 Kg, while stirring at 2000-3500r/min for 15-20min; then add 19 Kg of ammonium polyphosphate, Melamine 13 Kg and pentaerythritol 5 Kg are stirred at a speed of 800-1700r/min for 10-15min, then enter the sand mill for sand grinding, and use a scraper fineness meter to measure the particle fineness to 90

When it is below m, add 22 Kg of silicone-modified styrene-acrylic emulsion, add 0.5 Kg of film-forming aid (ethylene glycol), stir at a speed of 800-1700r/min for 15-20min, and let it stand. For finished products, packaging.

Example 2

m以下时即可，最后加入有机硅改性的苯丙乳液20 Kg，加入成膜助剂（乙二醇）1.17 Kg，以速度800-1700r/min进行搅拌15-20min后，静置即为成品，包装。 (a) Preparation of modified nano-aluminum hydroxide powder: Take 100 Kg of nano-aluminum hydroxide powder, 0.5 Kg of sodium hexametaphosphate powder, and 25 Kg of water according to the formula ratio, first put the nano-aluminum hydroxide powder in a beaker, Add water to make a slurry; place the slurry in a constant temperature water bath at 80°C-100°C; then add sodium hexametaphosphate and stir thoroughly for 20-30min to prepare a nano-aluminum hydroxide suspension; (b) preparation of auxiliary agents : Take 7 Kg of dispersant (polyacrylic acid copolymer solution), wetting agent (polyethoxylate), defoamer (polysiloxane) according to the ratio of the formula, and add 30Kg In water, stir evenly at a speed of 800-1700r/min for later use; (c), mixed finished product: take the above-mentioned auxiliary agent solution for use, and add anatase titanium dioxide and modified nano-aluminum hydroxide powder according to the formula ratio The mixture (modified nano-aluminum hydroxide is mixed with 8% of the weight of anatase titanium dioxide) 10 Kg, stirred at 2000-3500r/min for 15-20min; then 21 Kg of ammonium polyphosphate, 16Kg of melamine and 3 pentaerythritol were added Kg and stir at a speed of 800-1700r/min for 10-15min, then enter the sand mill for sand grinding, and use a scraper fineness meter to measure the particle fineness to 90

When it is less than m, add 20 Kg of silicone-modified styrene-acrylic emulsion and 1.17 Kg of film-forming aid (ethylene glycol), stir at a speed of 800-1700r/min for 15-20min, and then stand still. Product packaging.

Example 3

m以下时即可，最后加入有机硅改性的苯丙乳液25 Kg，加入成膜助剂（乙二醇）0.58Kg，以速度为800-1700r/min进行搅拌15-20min后，静置即为成品，包装。 (a) Prepare modified nano-aluminum hydroxide powder: Take 75 Kg of nano-aluminum hydroxide powder, 1.6 Kg of sodium hexametaphosphate powder, and 20 Kg of water according to the formula ratio, first put the nano-aluminum hydroxide powder in a beaker, add water Make a slurry; place the slurry in a constant temperature water bath at 80°C-100°C; then add sodium hexametaphosphate, and stir thoroughly for 20-30min to obtain a nano-aluminum hydroxide suspension; (b) Preparation of auxiliary agents: According to the formula ratio, take 3.5 Kg of dispersant (polyacrylic acid copolymer solution), wetting agent (polyethoxylate), defoamer (polysiloxane) according to 1:1:1, and add 25 Kg In water, stir evenly at a speed of 800-1700r/min for later use; (c), mixed finished product: take the above-mentioned auxiliary agent solution for use, and add anatase titanium dioxide and modified nano-aluminum hydroxide powder according to the formula ratio The mixture (modified nano-aluminum hydroxide is mixed with 10% of the weight of anatase titanium dioxide) 14 Kg, while stirring at 2000-3500r/min for 15-20min; then add 18 Kg of ammonium polyphosphate and 11 Kg of melamine respectively and pentaerythritol 7 Kg and after stirring for 10-15min at a speed of 800-1700r/min, enter the sand mill for sand grinding, and use a scraper fineness meter to measure the particle fineness to 90

When it is less than m, add 25 Kg of silicone-modified styrene-acrylic emulsion and 0.58Kg of film-forming aid (ethylene glycol), stir at a speed of 800-1700r/min for 15-20min, and let it stand. For finished products, packaging.

Example 4

m以下时即可，最后加入有机硅改性的苯丙乳液30 Kg，加入成膜助剂（乙二醇）1 Kg，以速度为800-1700r/min进行搅拌15-20min后，静置即为成品，包装。 (a) Prepare modified nano-aluminum hydroxide powder: Take 90Kg of nano-aluminum hydroxide powder, 3 Kg of sodium hexametaphosphate powder, and 15Kg of water according to the formula ratio, first put the nano-aluminum hydroxide powder in a beaker, add water to mix Form a slurry; place the slurry in a constant temperature water bath at 80°C-100°C; then add sodium hexametaphosphate, and stir thoroughly for 20-30min to obtain a nano-aluminum hydroxide suspension; (b), preparation of auxiliary agents: press The formula ratio first takes 6 Kg of dispersant (polyacrylic acid copolymer solution), wetting agent (polyethoxylate), and defoamer (polysiloxane) according to 1:1:1, and adds it to 20 Kg of water , Stir evenly at a speed of 800-1700r/min for later use; (c) Mixed finished product: Take the above-mentioned auxiliary agent solution for later use, and add a mixture of anatase titanium dioxide and modified nano-aluminum hydroxide powder according to the formula ratio (Modified nano-aluminum hydroxide is mixed with 7% of the weight of anatase titanium dioxide) 19 Kg, while stirring at 2000-3500r/min for 15-20min; then add 15Kg of ammonium polyphosphate, 6 Kg of melamine and pentaerythritol 10 Kg and stir at a speed of 800-1700r/min for 10-15min, then enter the sand mill for sand grinding, and use a scraper fineness meter to measure the particle fineness to 90

When it is below m, add 30 Kg of silicone-modified styrene-acrylic emulsion and 1 Kg of film-forming aid (ethylene glycol), stir at a speed of 800-1700r/min for 15-20min, and then let it stand. For finished products, packaging.

Example 5

m以下时即可，最后加入有机硅改性的苯丙乳液30 Kg，加入成膜助剂（乙二醇）0.35 Kg，以速度为800-1700r/min进行搅拌15-20min后，静置即为成品，包装。 (a) Prepare modified nano-aluminum hydroxide powder: Take 60Kg of nano-aluminum hydroxide powder, 0.8 Kg of sodium hexametaphosphate powder, and 24Kg of water according to the formula ratio, first put the nano-aluminum hydroxide powder in a beaker, add water to mix Form a slurry; place the slurry in a constant temperature water bath at 80°C-100°C; then add sodium hexametaphosphate, and stir thoroughly for 20-30min to obtain a nano-aluminum hydroxide suspension; (b), preparation of auxiliary agents: press The formula ratio first takes 2.1 Kg of dispersant (polyacrylic acid copolymer solution), wetting agent (polyethoxylate), and defoamer (polysiloxane) according to 1:1:1, and adds it to 27 Kg of water , Stir evenly at a speed of 800-1700r/min for later use; (c) Mixed finished product: Take the above-mentioned auxiliary agent solution for later use, and add a mixture of anatase titanium dioxide and modified nano-aluminum hydroxide powder according to the formula ratio (Modified nano-aluminum hydroxide is mixed with 9% of the weight of anatase-type titanium dioxide) 13 Kg, while stirring at 2000-3500r/min for 15-20min; then add ammonium polyphosphate 16Kg, melamine 8Kg and pentaerythritol 9 Kg and stir at a speed of 800-1700r/min for 10-15min, then enter the sand mill for sand grinding, and use a scraper fineness meter to measure the particle fineness to 90

When it is less than m, add 30 Kg of silicone-modified styrene-acrylic emulsion and 0.35 Kg of film-forming aid (ethylene glycol), stir at a speed of 800-1700r/min for 15-20min, and let it stand. For finished products, packaging.

Example 6

m以下时即可，最后加入有机硅改性的苯丙乳液21Kg，加入成膜助剂（乙二醇）0.75 Kg，以速度为800-1700r/min进行搅拌15-20min后，静置即为成品，包装。 (a) Preparation of modified nano-aluminum hydroxide powder: Take 85Kg of nano-aluminum hydroxide powder, 2.5 Kg of sodium hexametaphosphate powder, and 18Kg of water according to the formula ratio, first put the nano-aluminum hydroxide powder in a beaker, add water to mix Form a slurry; place the slurry in a constant temperature water bath at 80°C-100°C; then add sodium hexametaphosphate, and stir thoroughly for 20-30min to obtain a nano-aluminum hydroxide suspension; (b), preparation of auxiliary agents: press The formula ratio first takes 4.5Kg of dispersant (polyacrylic acid copolymer solution), wetting agent (polyethoxylate), and defoamer (polysiloxane) according to 1:1:1, and adds it to 21 Kg of water , Stir evenly at a speed of 800-1700r/min for later use; (c) Mixed finished product: Take the above-mentioned auxiliary agent solution for later use, and add a mixture of anatase titanium dioxide and modified nano-aluminum hydroxide powder according to the formula ratio (Modified nano-aluminum hydroxide is mixed with 6% of the weight of anatase titanium dioxide) 17 Kg, while stirring at 2000-3500r/min for 15-20min; then add ammonium polyphosphate 17Kg, melamine 14Kg and pentaerythritol 6 Kg and stir at a speed of 800-1700r/min for 10-15min, then enter the sand mill for sand grinding, and use a scraper fineness meter to measure the particle fineness to 90

When it is less than m, add 21Kg of silicone-modified styrene-acrylic emulsion, add 0.75 Kg of film-forming aid (ethylene glycol), stir at a speed of 800-1700r/min for 15-20min, and let it stand still. Product packaging.

Example 7

m以下时即可，最后加入有机硅改性的苯丙乳液26Kg，加入成膜助剂（乙二醇）0.9Kg，以速度为800-1700r/min进行搅拌15-20min后，静置即为成品，包装。 (a) Prepare modified nano-aluminum hydroxide powder: Take 55Kg of nano-aluminum hydroxide powder, 1 Kg of sodium hexametaphosphate powder, and 23Kg of water according to the formula ratio, first put the nano-aluminum hydroxide powder in a beaker, add water to mix Form a slurry; place the slurry in a constant temperature water bath at 80°C-100°C; then add sodium hexametaphosphate, and stir thoroughly for 20-30min to obtain a nano-aluminum hydroxide suspension; (b), preparation of auxiliary agents: press The formula ratio first takes 5.4Kg of dispersant (polyacrylic acid copolymer solution), wetting agent (polyethoxylate), and defoamer (polysiloxane) according to 1:1:1, and adds it to 29 Kg of water , Stir evenly at a speed of 800-1700r/min for later use; (c) Mixed finished product: Take the above-mentioned auxiliary agent solution for later use, and add a mixture of anatase titanium dioxide and modified nano-aluminum hydroxide powder according to the formula ratio (Modified nano-aluminum hydroxide is mixed with 7% of the weight of anatase titanium dioxide) 11 Kg, while stirring at 2000-3500r/min for 15-20min; then add ammonium polyphosphate 20Kg, melamine 9Kg and pentaerythritol 4 Kg and stir at a speed of 800-1700r/min for 10-15min, then enter the sand mill for sand grinding, and use a scraper fineness meter to measure the particle fineness to 90

When it is less than m, add 26Kg of silicone-modified styrene-acrylic emulsion, add 0.9Kg of film-forming aid (ethylene glycol), stir at a speed of 800-1700r/min for 15-20min, and let it stand. Product packaging.

Example 8

m以下时即可，最后加入有机硅改性的苯丙乳液24Kg，加入成膜助剂（乙二醇）1Kg，以速度为800-1700r/min进行搅拌15-20min后，静置即为成品，包装。 (a) Preparation of modified nano-aluminum hydroxide powder: Take 70Kg of nano-aluminum hydroxide powder, 1.5 Kg of sodium hexametaphosphate powder, and 19Kg of water according to the formula ratio, first put the nano-aluminum hydroxide powder in a beaker, add water to mix Form a slurry; place the slurry in a constant temperature water bath at 80°C-100°C; then add sodium hexametaphosphate, and stir thoroughly for 20-30min to obtain a nano-aluminum hydroxide suspension; (b), preparation of auxiliary agents: press The formula ratio first takes 6Kg of dispersant (polyacrylic acid copolymer solution), wetting agent (polyethoxylate), and defoamer (polysiloxane) according to 1:1:1, and adds it to 25 Kg of water. Stir evenly at a speed of 800-1700r/min for later use; (c) Mixed finished product: take the above auxiliary agent solution for later use, and add a mixture of anatase titanium dioxide and modified nano-aluminum hydroxide powder according to the formula ratio ( Modified nano-aluminum hydroxide (accounting for 10% of the weight of anatase titanium dioxide) 12 Kg, while stirring at 2000-3500r/min for 15-20min; then add 18Kg of ammonium polyphosphate, 10Kg of melamine and 8 Kg of pentaerythritol And after stirring at a speed of 800-1700r/min for 10-15min, enter the sand mill for sand grinding, and use a scraper fineness meter to measure the particle fineness to 90

When it is below m, add 24Kg of silicone-modified styrene-acrylic emulsion, add 1Kg of film-forming aid (ethylene glycol), stir at a speed of 800-1700r/min for 15-20min, and let stand to be the finished product ,Package.

Before using the present invention, the surface of the outer wall should be repaired, cleaned, filled with gaps, partially scraped putty, and smoothed. This coating is suitable for the brushing process. Open the package, stir it manually and brush it twice. The interval between the two times of brushing should not be less than 4 hours. In addition, the use process should be based on the use environment, brushing process and other factors, and the amount of brushing and brushing method should be adjusted according to the actual situation in order to obtain the best use effect.

Claims (5)

1. The modified nano-aluminum hydroxide water-based intumescent fireproof coating for finishes is characterized in that it is prepared from the following raw materials by weight percentage: Silicone-modified styrene-acrylic emulsion 20% to 30%, Mixture of anatase titanium dioxide and modified nano aluminum hydroxide powder 10%~19%, Ammonium polyphosphate 15%～21%, Melamine 6%～16%, Pentaerythritol 3%～10%, Auxiliary 2%～8%, Water 20% to 30%, The modified nano-aluminum hydroxide is prepared from the following raw materials in parts by weight: 50-100 parts of nano-aluminum hydroxide powder, 0.5-3 parts of sodium hexametaphosphate powder, and 15-25 parts of water; Described auxiliary agent comprises dispersant, wetting agent, defoamer and film-forming auxiliary agent; Described dispersant is polyacrylic acid copolymer solution; The wetting agent is polyethoxylate; Described defoamer is polysiloxanes; Described film-forming aid is ethylene glycol. 2. The modified nano-aluminum hydroxide water-based intumescent fireproof coating for finishing according to claim 1, characterized in that it is prepared from the following raw materials by weight percentage: Silicone-modified styrene-acrylic emulsion 22%～28%, Mixture of anatase titanium dioxide and modified nano aluminum hydroxide powder 13%~17%, Ammonium polyphosphate 16%～19%, Melamine 8%～13%, Pentaerythritol 5%～9%, Auxiliary 3%～7%, Water 21% to 27%, The modified nano-aluminum hydroxide is prepared from the following raw materials in parts by weight: 60-85 parts of nano-aluminum hydroxide powder, 0.8-2.5 parts of sodium hexametaphosphate powder, and 18-24 parts of water. 3. The modified nano-aluminum hydroxide water-based intumescent fireproof coating for finishes according to claim 1 or 2, wherein the modified nano-aluminum hydroxide accounts for 5% to 10% of the weight of anatase titanium dioxide. % mixed with it. 4. The modified nano-aluminum hydroxide water-based intumescent fireproof coating for finishes according to claim 1, wherein said dispersant, wetting agent, defoamer and film-forming aid are in a ratio of 1:1:1 : Prepared at a ratio of 0.5. 5. prepare the process method of the described modified nano-aluminum hydroxide water-based intumescent type finish fireproof coating of claim 1, it is characterized in that comprising the following steps: (a) Preparation of modified nano-aluminum hydroxide powder: put the nano-aluminum hydroxide powder in a beaker according to the formula ratio, add water to make a slurry; place the slurry in a constant temperature water bath at 80°C-100°C; then Add sodium hexametaphosphate, fully stir for 20-30 minutes to obtain nano-aluminum hydroxide suspension; then filter, dry and grind the nano-aluminum hydroxide suspension to obtain pretreated modified nano-aluminum hydroxide powder; (b) Preparation of auxiliary agent solution: Add polyacrylic acid copolymer solution, polyethoxylate, and polysiloxane into water in a ratio of 1:1:1, and stir evenly at a speed of 800-1700r/min for later use; (c) Mixed finished product: take the above-mentioned spare additive solution, add the mixture of anatase titanium dioxide and modified nano-aluminum hydroxide powder according to the formula ratio, and proceed at a speed of 2000-3500r/min at the same time Stir for 15-20min; then add ammonium polyphosphate, melamine and pentaerythritol respectively and stir at a speed of 800-1700r/min for 10-15min, then enter the sand mill for sand grinding, and use a scraper fineness meter to measure the particle size to 90μm It can be as follows, and finally add silicone-modified styrene-acrylic emulsion, add film-forming aid (ethylene glycol), stir at a speed of 800-1700r/min for 15-20min, let it stand still to be the finished product, and pack it.