CN115678400B - A special wear-resistant topcoat for inorganic floor coatings and its preparation method - Google Patents

Abstract

The invention belongs to the field of floor coatings, and particularly relates to a special wear-resistant finish paint for an inorganic floor coating and a preparation method thereof. The raw materials of the special wear-resistant finish coat paint for the inorganic floor coating comprise a component A and a component B; the component A comprises the following components: water, aqueous inorganic silicon resin, hydroxyl silicone oil modified multifunctional hydroxyl acrylic acid secondary fraction; the component B comprises: sulfonate modified water dispersible HDI trimer and a second film forming aid. The finish paint meets the performance requirements of national standard GB/T22374 terrace coating material on water-based finish paint.

Description

A special wear-resistant topcoat for inorganic floor coatings and its preparation method

Technical field

The invention belongs to the field of floor coatings, and more specifically, relates to a special wear-resistant topcoat for inorganic floor coatings and a preparation method thereof.

Background technique

At present, epoxy/polyurethane floor coatings are the most widely used floor coatings. They have a series of characteristics such as good decorative properties, excellent wear resistance, super adhesion, and good anti-skid properties, so they are widely used in It is widely used in garages, workshops, logistics warehouses, commercial complexes, cinemas, hotels, stadiums and other floors, and is highly recognized by users. However, there are some disadvantages to epoxy coatings/polyurethanes. For example, firstly, the fire protection level is B1, which does not reach level A fire protection. Secondly, epoxy floor/polyurethane coatings are two-component, and the main paint and curing agent must be mixed evenly according to a certain ratio before construction, making the construction more cumbersome. Third, epoxy coatings are generally only used indoors because they tend to turn yellow after exposure to the sun. Although polyurethane can be used outdoors, it is relatively expensive, resulting in extremely high material costs. Generally, users will not choose it due to cost considerations.

Inorganic coatings are coatings based on silicate or silica sol and emulsion, combined with pigments, fillers, water and additives. It has the advantages of good breathability, Class A fire protection, weather resistance, and environmental protection. Currently, corresponding products for interior and exterior wall coatings are on sale and have been recognized by users. In the field of floor coatings, inorganic floor coatings have been gradually introduced, which are also based on silicate or silica sol and emulsion. However, due to the characteristics of silicate, its film-forming properties are slightly less than those of epoxy or polyurethane, especially in terms of wear resistance, surface strength and stain resistance, which are not enough to fully meet the long-term use needs of floor coatings. Therefore, the demand for inorganic floor coatings is imminent.

Contents of the invention

The purpose of the present invention is to solve the above problems and provide a paint film that is fireproof and flame-resistant, has no harmful substances such as free diisocyanate and free formaldehyde, TVOC≤2, has good appearance of the paint film, high tensile bonding strength and surface strength. High, good wear resistance, certain corrosion resistance, and good weather resistance. When compounded on the surface of inorganic floor coatings, it can effectively improve wear resistance, surface hardness, chemical resistance, and water resistance, and can be used for outdoor painting. With other advantages, it is a special wear-resistant topcoat for inorganic floor coatings that can meet the requirements for water-based topcoats in the national standard GB/T22374-2018 "Floor Coating Materials" and its preparation method. The production process is simple and suitable for industrial production.

In order to achieve the above object, the first aspect of the present invention provides a special wear-resistant topcoat for inorganic floor coatings. The raw material composition of the special wear-resistant topcoat for inorganic floor coatings includes component A and component B;

Component A includes:

15-30 parts by weight of water, 5-30 parts by weight of water-based inorganic silicone resin, 50-80 parts by weight of multifunctional hydroxyacrylic acid secondary dispersion modified with hydroxyl silicone oil, 0-10 parts by weight of first film-forming aid, thickening 0-3 parts by weight of agent, 0-3 parts by weight of defoaming agent, 0-2 parts by weight of wetting agent, and 0-2 parts by weight of fungicide;

Component B includes:

The sulfonate-modified water-dispersible HDI trimer is 70-85 parts by weight and the second film-forming assistant is 15-30 parts by weight.

In the present invention, the working principle of the special wear-resistant topcoat for inorganic floor coatings is as follows:

The main film-forming substance of inorganic paint topcoat is silicate resin, and its chemical formula is M ₂ O·nSiO ₂ . Among them, M represents K (potassium), Na (sodium) or Li (lithium), etc.

The main film-forming substance of water-based inorganic silicone resin is xSiO ₂ , which can chemically solidify with the silicate resin, the main film-forming substance of inorganic coating topcoat, so that the special wear-resistant topcoat for inorganic floor coatings can adhere firmly to the inorganic coating topcoat. The reaction mechanism is as follows:

M ₂ O·nSiO ₂ +xSiO ₂ →M ₂ O·(n+x)SiO ₂

M ₂ O·(n+x)SiO ₂ +CO ₂ →(n+x)SiO ₂ +M ₂ CO ₃

As a preferred solution, among the special wear-resistant topcoats for inorganic floor coatings,

Component A includes:

15-25 parts by weight of water, 5-25 parts by weight of water-based inorganic silicone resin, 50-75 parts by weight of multifunctional hydroxyacrylic acid secondary dispersion modified with hydroxyl silicone oil, 1-8 parts by weight of first film-forming aid, thickening 0.1-2 parts by weight of agent, 0.1-2 parts by weight of defoaming agent, 0.1-1.5 parts by weight of wetting agent, and 0.1-1.5 parts by weight of fungicide;

Component B includes:

The sulfonate-modified water-dispersible HDI trimer is 75-85 parts by weight and the second film-forming assistant is 15-25 parts by weight.

As a preferred option, the weight ratio of component A and component B is 4-5:1.

Water-based inorganic silicone resin is a highly stable inorganic silicone resin made through different purification, passivation, and chemical grafting processes. Water-based inorganic silicone resin has the characteristics of temperature resistance, non-flammability, high hardness, scrub resistance, weather resistance, moisture permeability and waterproof, antibacterial and mildew proof. Water-based inorganic silicone resin is compatible with water-based emulsions and water-soluble resins. It is used in organic-inorganic hybrid coatings to improve the permeability and film-forming properties of film-forming substances to the substrate. It can be made with high durability, high strength, and low VOC Water-based inorganic modified organic composite coatings. Water-based inorganic silicone resin has excellent film-forming reactivity and can penetrate into the pores of the inorganic topcoat, causing silicification to form a stable mineral composite layer, effectively enhancing the adhesion between the inorganic topcoat and the wear-resistant surface. Further improve the overall paint film strength. As a preferred embodiment, the water-based inorganic silicone resin includes water and silica, and the weight ratio of the two is 60-70:30-40. As a preferred solution, the solid content of the water-based inorganic silicone resin is 25-35%, the specific gravity is 1.08-1.23g/mL, the pH=9-11, and the viscosity is 30-200cps. Specifically, the water-based inorganic silicone resin can be AS125 water-based silicone resin from Shanghai Wobes Xincai Materials Co., Ltd. Its composition includes water and silica, the weight ratio of the two is 30:65, the solid content is >30%, and the specific gravity is 1.08-1.25g/mL, pH=9-11, viscosity 30-200cps.

As a preferred solution, the hydroxyl content of the hydroxyl silicone oil-modified multifunctional hydroxyacrylic secondary dispersion is 3.3-5.0, the viscosity is 50-4000mPa.s, the density is 1.0-1.1g/mL, the gloss is >90, and the hardness is > 2H. The hydroxyl silicone oil-modified multifunctional hydroxyacrylic secondary dispersion can be AS204 modified hydroxyacrylic dispersion from Shanghai Wobes New Materials Co., Ltd., with a hydroxyl content of 3.3, a viscosity of <600Pa.s, and a density of 1.02-1.06g. /mL, high gloss>90, pencil hardness>2H.

As a preferred solution, the NCO content of the sulfonate-modified water-dispersible HDI trimer is 18.8%-22.5%, and the viscosity is 500-3500mPa.s. The sulfonate-modified water-dispersible HDI trimer can be selected from at least one of Aquolin 278, Aquolin 269 and Aquolin 270 from Wanhua Chemical Group Co., Ltd. The NCO content of Aquolin 278 is 22.5% and the viscosity is 1500-3500mPa. .s.

As a preferred embodiment, the thickener is selected from at least one of methyl cellulose ether, hydroxyethyl cellulose ether and methyl hydroxyethyl cellulose ether. As a further preferred solution, the thickener is hydroxyethyl cellulose ether, such as E230 FQ and EBM 1000 of AkzoNobel, QP-300H of Dow and R-9360 of Shanghai Vobes New Materials Co., Ltd. at least one of them.

As a preferred embodiment, the fungicide is selected from at least one selected from the group consisting of isothiazolinone derivatives, imidazole derivatives, and phenolic derivatives. As a further preferred solution, the fungicide is an isothiazolinone derivative, such as SN 50905 water-based inorganic coating fungicide of Shanghai Shenzhu Chemical Technology Co., Ltd., Kathon LXE fungicide, preventol bm5 fungicide, etc.

As a preferred embodiment, the defoaming agent is selected from at least one of mineral oil defoaming agents, silicone defoaming agents and non-silicon defoaming agents. As a further preferred solution, the defoaming agent is a mineral oil defoaming agent, such as DAPRO DF 680 and DAPRO DF 975 from Elementis Company.

As a preferred embodiment, the wetting agent is selected from at least one of modified silicone-type wetting agents and acrylic acid-type wetting agents. As a further preferred solution, the wetting agent can be Evonik's tego wet 270 and/or tego 280.

As a preferred embodiment, the first film-forming aid and the second film-forming aid are each selected from the group consisting of propylene glycol diacetate, propylene glycol methyl ether acetate, dipropylene glycol monobutyl ether, dipropylene glycol methyl ether, and dipropylene glycol. At least one of butyl ether, dipropylene glycol dimethyl ether and 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate. Such as Eastman's Texanol and Dow's Dowanol DPnb.

A second aspect of the present invention provides a method for preparing the above-mentioned special wear-resistant topcoat for inorganic floor coatings. The preparation method includes:

Prepare component A:

1) Optionally mix the thickener and water evenly;

2) Combine the material obtained in step 1) with water-based inorganic silicone resin, hydroxyl silicone oil modified multifunctional hydroxyacrylic acid secondary dispersion, optional first film-forming aid, optional defoaming agent, optional wetting agent agent and optional fungicide are mixed and dispersed to obtain component A;

Prepare component B:

Under inert gas protection conditions, mix and disperse the sulfonate-modified water-dispersible HDI trimer and the second film-forming aid to obtain component B.

As a preferred solution, in step 1), add the thickener to water stirred at a speed of 200-400r/min. After stirring evenly, disperse it into a paste at a speed of 1000-2000r/min. The dispersion time is 10-20min. .

As a preferred version, in step 2), the mixing and dispersing speed is 500-1000 r/min, and the mixing and dispersing time is 5-15 min.

Beneficial effects of the present invention:

1. The main component of the topcoat of the present invention contains non-flammable water-based inorganic silicone resin. The main component is tested in accordance with the standard GB 8624-2012 "Combustion Performance Classification of Building Materials and Products" and can pass the A2 level (non-combustible) building material Require.

2. The formula of the topcoat of the present invention does not artificially add volatile organic compounds (VOC), free formaldehyde and other harmful substances to the human body, making it more green and environmentally friendly. Tested in accordance with the standard GB/T 22374-2018 "Floor Coating Materials", free formaldehyde is ≤30 mg/kg; the sum of benzene, toluene, ethylbenzene, and xylene was not detected, and the sum of glycol ethers and ether esters and free formaldehyde were not detected. Isocyanate (TDI, HDI, limited to polyurethane) and formaldehyde release were not detected; TVOC ≤ 2; VOC ≤ 100g/L.

3. The topcoat of the present invention is applied to the surface of the inorganic floor coating, and can impart excellent wear resistance, surface hardness and chemical resistance to the inorganic floor coating.

4. The topcoat of the present invention meets the performance requirements of the national standard GB/T 22374 "Floor Coating Materials" for water-based topcoats.

5. The cover surface of the present invention has good weather resistance, artificial climate aging resistance >800h, and can be used outdoors.

Other features and advantages of the present invention will be described in detail in the following detailed description.

Detailed ways

Preferred embodiments of the invention will be described in more detail below. Although preferred embodiments of the present invention are described below, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Experimental methods without specifying specific conditions in the following examples usually follow conventional conditions or conditions recommended by the manufacturer. Unless otherwise stated, percentages and parts are by weight. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as familiar to one skilled in the art.

In the examples and comparative examples of the present invention, the sources of each raw material are:

Component A:

Thickener: EBM 1000 from AkzoNobel;

Water-based inorganic silicone resin: AS125 water-based silicone resin from Shanghai Wobes Xincai Materials Co., Ltd.;

Wetting agent: Evonik’s tego wet 270;

Defoaming agent: DAPRO DF 680 from Elementis;

Fungicide: preventol bm5 fungicide;

Film-forming additive: Texanol from Eastman;

Multifunctional hydroxyacrylic acid secondary dispersion modified by hydroxyl silicone oil: AS204 modified hydroxyacrylic acid dispersion from Shanghai Wobes Xincai Materials Co., Ltd.

Component B:

Film-forming additive: Texanol from Eastman;

Sulfonate-modified water-dispersible HDI trimer: Aquolin 278 from Wanhua Chemical;

Example 1

Add 1.2 parts by weight of thickening agent to 20 parts by weight of water stirred at 300r/min. After stirring evenly, disperse it into a paste at high speed at 2000r/min. The stirring time is 20min. Then add 20 parts by weight of water-based inorganic silicone resin and 1 part by weight of moisturizing agent. Wet agent, 0.7 parts by weight of defoaming agent, 0.5 parts by weight of fungicide, 4 parts by weight of film-forming aid, 75 parts by weight of hydroxyl silicone oil modified multifunctional hydroxyacrylic acid secondary dispersion, mix and disperse at 1000r/min, stir The time is 10 minutes; after the dispersion is completed, the component A of the special wear-resistant topcoat for inorganic floor coatings is obtained. Under nitrogen protection conditions, add 15 parts by weight of film-forming aid to 85 parts by weight of sulfonate-modified water-dispersible HDI trimer to obtain Group B of the wear-resistant topcoat for inorganic floor coatings. point. Mix component A and component B at a ratio of 4.5:1 and assist with construction to obtain a special wear-resistant topcoat for inorganic floor coatings.

The performance is tested in accordance with the national standard GB/T 22374 "Floor Coating Materials" for water-based topcoats.

Example 2

Add 1.2 parts by weight of thickening agent to 15 parts by weight of water stirred at 300r/min. After stirring evenly, disperse it into a paste at high speed at 2000r/min. The stirring time is 20min. Then add 10 parts by weight of water-based inorganic silicone resin and 0.8 parts by weight of moistened water. Wet agent, 0.7 parts by weight of defoaming agent, 0.5 parts by weight of fungicide, 4 parts by weight of film-forming aid, 75 parts by weight of hydroxyl silicone oil modified multifunctional hydroxyacrylic acid secondary dispersion, mix and disperse at 1000r/min, stir The time is 10 minutes; after the dispersion is completed, the component A of the special wear-resistant topcoat for inorganic floor coatings is obtained. Under nitrogen protection conditions, add 15 parts by weight of film-forming aid to 85 parts by weight of sulfonate-modified water-dispersible HDI trimer to obtain Group B of the wear-resistant topcoat for inorganic floor coatings. point. Mix component A and component B at a ratio of 4.5:1 and assist with construction to obtain a special wear-resistant topcoat for inorganic floor coatings.

The performance is tested in accordance with the national standard GB/T 22374 "Floor Coating Materials" for water-based topcoats.

Example 3

Add 1.2 parts by weight of thickening agent to 15 parts by weight of water stirred at 300r/min. After stirring evenly, disperse it into a paste at high speed at 2000r/min. The stirring time is 20min. Then add 20 parts by weight of water-based inorganic silicone resin and 1 part by weight of moisturizing agent. Wet agent, 0.7 parts by weight of defoaming agent, 0.5 parts by weight of fungicide, 4 parts by weight of film-forming aid, 60 parts by weight of hydroxyl silicone oil modified multifunctional hydroxyacrylic acid secondary dispersion, mix and disperse at 1000r/min, stir The time is 10 minutes; after the dispersion is completed, the component A of the special wear-resistant topcoat for inorganic floor coatings is obtained. Under nitrogen protection conditions, add 20 parts by weight of film-forming assistant to 80 parts by weight of sulfonate-modified water-dispersible HDI trimer to obtain Group B of the wear-resistant topcoat for inorganic floor coatings. point. Mix component A and component B at a ratio of 4.5:1 and assist with construction to obtain a special wear-resistant topcoat for inorganic floor coatings.

The performance is tested in accordance with the national standard GB/T 22374 "Floor Coating Materials" for water-based topcoats.

Comparative Example 1 Inorganic silicone resin is not within the given range

Add 1.2 parts by weight of the thickening agent to 20 parts by weight of water stirred at 300r/min. After stirring evenly, disperse it into a paste at high speed at 2000r/min. The stirring time is 20min. Then add 40 parts by weight of water-based inorganic silicone resin and 1.2 parts by weight of moistened water. Wet agent, 0.7 parts by weight of defoaming agent, 0.5 parts by weight of fungicide, 5 parts by weight of film-forming aid, 60 parts by weight of hydroxyl silicone oil modified multifunctional hydroxyacrylic acid secondary dispersion, mix and disperse at 1000r/min, stir The time is 10 minutes; after the dispersion is completed, the component A of the special wear-resistant topcoat for inorganic floor coatings is obtained. Under nitrogen protection conditions, add 20 parts by weight of film-forming assistant to 80 parts by weight of sulfonate-modified water-dispersible HDI trimer to obtain Group B of the wear-resistant topcoat for inorganic floor coatings. point. Mix component A and component B at a ratio of 4.5:1 and assist with construction to obtain a special wear-resistant topcoat for inorganic floor coatings.

Comparative Example 2 does not add inorganic resin

Add 1.2 parts by weight of the thickening agent to the water stirred at 300r/min. After stirring evenly, disperse it into a paste at a high speed of 2000r/min. The stirring time is 20min; then add 0.7 parts by weight of the wetting agent, 0.7 parts by weight of the defoaming agent, 0.5 Parts by weight of bactericide, 3 parts by weight of film-forming aid, and 60 parts by weight of hydroxyl silicone oil-modified multifunctional hydroxyacrylic acid secondary dispersion, mixed and dispersed at 1000 r/min, stirring time 10 min; after the dispersion is completed, the described Component A of the special wear-resistant topcoat for inorganic floor coatings. Under nitrogen protection conditions, add 20 parts by weight of film-forming assistant to 80 parts by weight of sulfonate-modified water-dispersible HDI trimer to obtain Group B of the wear-resistant topcoat for inorganic floor coatings. point. Mix component A and component B at a ratio of 4.5:1 and assist with construction to obtain a special wear-resistant topcoat for inorganic floor coatings.

Comparative example 3

The only difference from Example 2 is that 30 parts by weight of hydroxyl silicone oil-modified multifunctional hydroxyacrylic acid secondary dispersion was used.

Add 1.2 parts by weight of thickening agent to 15 parts by weight of water stirred at 300r/min. After stirring evenly, disperse it into a paste at high speed at 2000r/min. The stirring time is 20min. Then add 10 parts by weight of water-based inorganic silicone resin and 0.8 parts by weight of moistened water. Wet agent, 0.7 parts by weight of defoaming agent, 0.5 parts by weight of fungicide, 4 parts by weight of film-forming aid, 30 parts by weight of hydroxyl silicone oil modified multifunctional hydroxyacrylic acid secondary dispersion, mix and disperse at 1000r/min, stir The time is 10 minutes; after the dispersion is completed, the component A of the special wear-resistant topcoat for inorganic floor coatings is obtained. Under nitrogen protection conditions, add 15 parts by weight of film-forming aid to 85 parts by weight of sulfonate-modified water-dispersible HDI trimer to obtain Group B of the wear-resistant topcoat for inorganic floor coatings. point. Mix component A and component B at a ratio of 4.5:1 and assist with construction to obtain a special wear-resistant topcoat for inorganic floor coatings.

The performance is tested in accordance with the national standard GB/T 22374 "Floor Coating Materials" for water-based topcoats.

Comparative example 4

The only difference from Example 3 is that 150 parts by weight of hydroxyl silicone oil-modified multifunctional hydroxyacrylic acid secondary dispersion was used.

Add 1.2 parts by weight of thickening agent to 15 parts by weight of water stirred at 300r/min. After stirring evenly, disperse it into a paste at high speed at 2000r/min. The stirring time is 20min. Then add 20 parts by weight of water-based inorganic silicone resin and 1 part by weight of moisturizing agent. Wet agent, 0.7 parts by weight of defoaming agent, 0.5 parts by weight of fungicide, 4 parts by weight of film-forming aid, 150 parts by weight of hydroxyl silicone oil modified multifunctional hydroxyacrylic acid secondary dispersion, mix and disperse at 1000r/min, stir The time is 10 minutes; after the dispersion is completed, the component A of the special wear-resistant topcoat for inorganic floor coatings is obtained. Under nitrogen protection conditions, add 20 parts by weight of film-forming assistant to 80 parts by weight of sulfonate-modified water-dispersible HDI trimer to obtain Group B of the wear-resistant topcoat for inorganic floor coatings. point. Mix component A and component B at a ratio of 4.5:1 and assist with construction to obtain a special wear-resistant topcoat for inorganic floor coatings.

The performance is tested in accordance with the national standard GB/T 22374 "Floor Coating Materials" for water-based topcoats.

Table 1 Performance comparison between embodiments and comparative examples

It can be seen from Table 1 that the indicators of Comparative Examples 1-3 meet the requirements of water-based topcoats in the national standard GB/T 22374 "Floor Coating Materials". In particular, Example 1 has a tensile bonding strength as high as 3.6MPa. , far exceeding the standard requirements, the tensile strength still maintains a tensile bonding strength of 2.9MPa after immersion in water, and has excellent tensile bonding performance. Secondly, in terms of drying speed, the drying speed of the topcoat, which is about 60 minutes to touch dry and 8 hours to dry, is very consistent with the drying speed of the inorganic system, which is 20 minutes to touch dry and 4 hours to dry, which greatly shortens the construction period. Third, in terms of chemical resistance, it can be seen that the inorganic coating has good alkali resistance. After testing for alkali resistance, water resistance, oil resistance, acid resistance, and solvent oil resistance, the paint film is complete, non-blistering, No peeling or discoloration, meeting the requirements of topcoat. Fourth, in terms of hazardous substance limits, free formaldehyde is ≤30 mg/kg; the sum of benzene, toluene, ethylbenzene, and xylene has not been detected, and the sum of glycol ether and ether ester, free diisocyanate (TDI, HDI, limited to polyurethane) ) and formaldehyde release were not detected; TVOC≤2; VOC≤100g/L. Fifth, the inorganic topcoat was tested in accordance with the standard GB8624-2012 "Combustion Performance Classification of Building Materials and Products" and can pass the requirements of Class A2 (non-combustible) building materials. In terms of other properties, the inorganic topcoat has good weather resistance, can withstand artificial climate aging for 800 hours, and also has good impact resistance and anti-skid properties.

On the other hand, in order to further demonstrate the advantages of the present invention, a commercially available inorganic topcoat was purchased and applied as the substrate.

Table 2 Performance comparison between Examples and Comparative Examples

As can be seen from Table 2, for inorganic topcoats, the film formation is normal, the surface is smooth, and there are no shrinkage holes, floating colors, blooming, wrinkles, pinholes, or cracking, but the wear resistance More than 0.05g, unqualified. Similarly, the pencil hardness of the surface is HB. Although the national standard does not require pencil hardness, in general actual use, the pencil hardness needs to be greater than H to meet the needs of floor coatings. In terms of impact resistance, the inorganic topcoat cannot withstand the impact of a 1kg steel ball, which means it cannot withstand heavy loads. In terms of anti-skid property, it is greater than 0.5, which just meets the anti-skid requirements. In terms of water resistance, alkali resistance, and oil resistance, there is slight discoloration, and it is unqualified in terms of acid resistance. The reason is that the paint film system itself is alkaline. The combustion performance level meets A2 level.

On the inorganic topcoat, apply Example 1, Comparative Example 1 and Comparative Example 2 respectively. It can be seen from Table 2 that after applying Example 1, the surface of the paint film is smooth and has no shrinkage holes, floating color or blooming. , wrinkles, pinholes, and cracking; the wear resistance is 0.028g, which meets the standard requirements; the pencil hardness is increased from B to 2H, which can meet the needs of floor coatings; in terms of impact resistance, the paint film can withstand 1kg steel The impact of the ball means it can withstand heavy loads; in terms of anti-skid properties, the dry friction coefficient is 0.61, which meets the requirements of anti-skid; in terms of water resistance, alkali resistance, and oil resistance, the improvement is more obvious, and the paint film does not blister, No peeling, no discoloration, acid resistance improved from unqualified to qualified, no blistering, no peeling, no discoloration of the paint film. The combustion performance level meets A2 level.

Judging from Comparative Example 1 and Comparative Example 2, the surface of the paint film of Comparative Example 1 is smooth, without shrinkage holes, floating color, blooming, wrinkles, pinholes, and slight cracking; while the surface of the paint film of Comparative Example 2 is smooth and has no shrinkage holes. , floating color, blooming, wrinkles, pinholes, and cracking. The wear resistance of both is qualified and meets the standard requirements; in terms of pencil hardness, Comparative Example 1 is improved from HB to B, while Comparative Example 2 is improved from HB to H; in terms of impact resistance, Comparative Example 1 has slight cracks, while Comparative Example 2 has Comparative Example 2 does not have any; in terms of anti-skid properties, it meets the requirements of anti-skid; in terms of water resistance, alkali resistance, oil resistance, and acid resistance, Comparative Example 1 has slight discoloration, while Comparative Example 2 has no discoloration; in terms of combustion performance, Comparative Example 1 It can meet the A2 level, while Comparative Example 1 can only meet the B1 level. To sum up, the special wear-resistant topcoat for inorganic floor coatings prepared by the present invention has a paint film that is fireproof and flame-resistant (A2 level). When compounded on the surface of inorganic floor coatings, it can effectively improve the wear resistance, surface hardness, and chemical resistance. , water resistance, etc. In Comparative Examples 3 and 4, due to inappropriate dosages of the hydroxyl silicone oil-modified multifunctional hydroxyacrylic acid secondary dispersion and the sulfonate-modified water-dispersible HDI trimer, Comparative Examples 3 and 4 were in the same position. There are many performance problems, such as acid resistance, alkali resistance, oil resistance, pencil hardness, etc., but the effect is reduced.

The embodiments of the present invention have been described above. The above description is illustrative, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims (5)

1. The special wear-resistant finish coat for the inorganic floor coating is characterized by comprising a component A and a component B;

the component A consists of the following components:

20-25 parts of water, 20-25 parts of water-based inorganic silicon resin, 50-75 parts of hydroxyl silicone oil modified multifunctional hydroxyl acrylic secondary dispersion, 4-8 parts of first film forming auxiliary agent, 1.2-2 parts of thickener, 0.7-2 parts of defoamer, 1-1.5 parts of wetting agent and 0.5-1.5 parts of bactericide;

the component B consists of the following components:

75-85 parts by weight of sulfonate modified water-dispersible HDI trimer and 15-25 parts by weight of a second film forming auxiliary agent;

the aqueous inorganic silicone resin is AS125 aqueous silicone resin of Shanghai Wo Beisi new color materials limited company;

the thickener is at least one selected from methyl cellulose ether, hydroxyethyl cellulose ether and methyl hydroxyethyl cellulose ether;

the second film forming auxiliary agent is at least one selected from propylene glycol diacetate, propylene glycol methyl ether acetate, dipropylene glycol methyl ether, dipropylene glycol butyl ether, dipropylene glycol dimethyl ether and 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate;

the main film forming substance of the inorganic floor coating is silicate resin, and the chemical formula is M ₂ O·nSiO ₂ Wherein M represents potassium, sodium or lithium;

the weight ratio of the component A to the component B is 4-5:1, a step of;

the hydroxy silicone oil modified multifunctional hydroxy acrylic acid secondary dispersion is AS204 modified hydroxy acrylic acid dispersion of Shanghai Wo Beisi New color materials Co.

2. The special wear-resistant finish for inorganic floor coating according to claim 1, wherein,

the sulfonate modified water dispersible HDI trimer has an NCO content of 18.8% -22.5% and a viscosity of 500-3500mPa.s.

3. The special wear-resistant finish for inorganic floor coating according to claim 1, wherein,

the bactericide is at least one selected from isothiazolinone derivatives, imidazole derivatives and phenol derivatives;

the defoaming agent is at least one selected from mineral oil defoaming agents, organic silicon defoaming agents and non-silicon defoaming agents;

the wetting agent is at least one of modified organic silicon type wetting agent and acrylic acid type wetting agent;

the first film forming auxiliary agent is selected from at least one of propylene glycol diacetate, propylene glycol methyl ether acetate, dipropylene glycol methyl ether, dipropylene glycol butyl ether, dipropylene glycol dimethyl ether and 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate.

4. A method for preparing the special wear-resistant finish paint for the inorganic floor coating as claimed in any one of claims 1 to 3, which is characterized by comprising the following steps:

preparing a component A:

1) Uniformly mixing a thickening agent and water;

2) Mixing and dispersing the substance obtained in the step 1) with water-based inorganic silicon resin, hydroxyl silicone oil modified multifunctional hydroxyl acrylic acid secondary fraction, a first film forming auxiliary agent, a defoaming agent, a wetting agent and a bactericide to obtain a component A;

and (3) preparing a component B:

under the protection of inert gas, sulfonate modified water dispersible HDI trimer and a second film forming auxiliary agent are mixed and dispersed to obtain a component B.

5. The method for preparing the special wear-resistant finish paint for the inorganic floor coating, according to claim 4,

in the step 1), the thickener is added into water stirred at the rotating speed of 200-400r/min, and after being uniformly stirred, the thickener is dispersed into paste at the rotating speed of 1000-2000r/min for 10-20min;

in the step 2), the rotation speed of mixing and dispersing is 500-1000r/min, and the time of mixing and dispersing is 5-15min.