Inorganic coating and method for its preparation

Abstract

The present application relates to a kind of inorganic coating and its preparation method, inorganic coating of the present application, with weight parts, raw material includes the following components: water 2-10 parts, silica sol complex 40-60 parts, thickening agent 0.5-1.5 parts, dispersing agent 0.5-1 part, wetting agent 0.1-0.5 part, antifoaming agent 0.5-1 part, titanium white 10-20 parts, barium sulfate 5-9 parts, heavy calcium 5-20 parts, mica powder 3-5 parts, emulsion 5-10 parts, scratch-resistant auxiliary 0.5-2 parts, film-forming auxiliary 0.5-1 part;The silica sol complex is mixed by small particle size silica sol with particle size range 5-20nm and large particle size silica sol with particle size range 20-100nm;Wherein the mass of small particle size silica sol accounts for 40-70% in silica sol complex.The inorganic coating of the present application has good washability, especially good scrubbing resistance after 2 weeks of hot storage, and good stain resistance, when used for interior wall decoration and protection, it is easy to remove footprints, pen marks and other marks on the surface of wall paint film.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paint, in particular to an inorganic paint and a preparation method thereof. BACKGROUND

[0002] With the improvement of living standards, people have higher and higher requirements for home environment. The building paint on the market is mainly the paint with organic polymer emulsion as film-forming material, but this kind of paint generally has the disadvantages of poor weather resistance, easy mildew, aging and flammability, and may have certain influence on indoor air quality. Compared with organic paint, inorganic paint is directly taken from the abundant minerals in nature, and the production and use process of its base material fully meets the requirements of energy saving and emission reduction, and has technical indicators that most organic paints with equivalent cost cannot achieve. In recent years, the domestic building engineering market has promoted the rapid development of inorganic paint due to the mandatory requirements of the state for fireproof and non-combustible paint for underground closed space, and inorganic silicate paint has found a rare development opportunity in China.

[0003] At present, inorganic paint mainly uses silicate film-forming material, and the water resistance is poor, and the scrubbing resistance is often not ideal. The scrubbing resistance of most inorganic paint on the market is difficult to be stable at more than 6000 times before and after hot storage. In addition, the stain resistance of the inorganic paint on the market is poor, and it is difficult to remove footprints, pen marks and the like on the surface of the wall paint film when used for interior wall decoration and protection. Therefore, the existing inorganic paint cannot well meet the needs of the family decoration environment with high requirements for scrubbing resistance and stain resistance.

[0004] In view of the advantages of incombustibility, weather resistance and the like of inorganic paint, how to prepare inorganic paint with green environmental protection, excellent scrubbing resistance and high stain resistance has not been reported, and this problem needs to be solved urgently. SUMMARY

[0005] The present application provides an inorganic paint and a preparation method thereof. The inorganic paint of the present application has good scrubbing resistance, especially good scrubbing resistance after 2 weeks of hot storage, and good stain resistance, and it is easy to remove footprints, pen marks and the like on the surface of the wall paint film when used for interior wall decoration and protection.

[0006] The present application is realized by the following technical scheme:

[0007] An inorganic paint, in terms of weight parts, the raw materials thereof include the following components: water 2-10 parts, silica sol compound 40-60 parts, thickening agent 0.5-1.5 parts, dispersing agent 0.5-1 part, wetting agent 0.1-0.5 part, defoaming agent 0.5-1 part, titanium white 10-20 parts, barium sulfate 5-9 parts, heavy calcium 5-20 parts, mica powder 3-5 parts, emulsion 5-10 parts, scratch-resistant aid 0.5-2 parts, and film-forming aid 0.5-1 part.

[0008] The silicon sol complex is mixed from small particle size silicon sol with particle size ranging from 5-20nm and large particle size silicon sol with particle size ranging from 20-100nm;

[0009] The mass of the small particle size silicon sol accounts for 40-70% of the silicon sol complex.

[0010] Preferably, the emulsion is one of benzene propylene emulsion, pure propylene emulsion, silicon propylene emulsion, fluorocarbon emulsion or a mixture of any two or more thereof in any ratio.

[0011] Preferably, the thickening agent is one of hydroxyethyl cellulose, attapulgite, polyurethane thickening agent or alkali thickening or a mixture of any two or more thereof in any ratio.

[0012] Preferably, the dispersing agent is one of polycarboxylic acid sodium salt dispersing agent, polyacrylic acid sodium salt dispersing agent or a mixture of any two or more thereof in any ratio.

[0013] Preferably, the wetting agent is one of non-ionic surfactant or anionic surfactant or a mixture of any two or more thereof in any ratio.

[0014] Preferably, the defoaming agent is one of mineral oil defoaming agent, organic silicon defoaming agent or a mixture of any two or more thereof in any ratio.

[0015] Preferably, the scratch-resistant aid is organic silicon scratch-resistant aid.

[0016] Preferably, the titanium white is rutile titanium white.

[0017] Preferably, the barium sulfate is one of natural barium sulfate or precipitated barium sulfate or a mixture of any two or more thereof in any ratio.

[0018] Scheme II)

[0019] A preparation method of inorganic paint, comprising the following steps:

[0020] (1) first add water and part of the silicon sol complex in a dispersion cylinder, then add part of the thickening agent under the stirring rate of 300-500rpm, stir until the viscosity is obviously thickened, then add the dispersing agent, wetting agent and defoaming agent, disperse for 3-8 minutes;

[0021] (2) then add titanium white, barium sulfate, heavy calcium and mica powder under the stirring rate of 1000-1300rpm, continue to stir for 15-20 minutes until the fineness is detected to be lower than 50μm;

[0022] (3) Then, under the stirring rate of 800-1000 rpm, the emulsion is added, and stirred for 3-8 minutes until the emulsion is uniformly mixed;

[0023] (4) Finally, the remaining silica sol compound, film-forming aid, scratch-resistant aid and remaining thickening agent are added, stirred for 10-15 minutes until uniform, filtered, and the inorganic coating is obtained.

[0024] Compared with the prior art, the application can effectively solve the problems of poor initial scrubbing resistance, worse scrubbing resistance after heat storage (after heat storage at 50℃ for 2 weeks, the scrubbing resistance is usually <6000 times), and poor stain resistance of the inorganic coating.

[0025] The compound of silica sol (small particle size modified silica sol+large particle size modified silica sol) as the film-forming material of the inorganic coating, when the silica sol is more than 40%, the scrubbing resistance of the product is significantly improved (initial scrubbing resistance: >20000 times without damage; scrubbing resistance after heat storage at 50℃ for 2 weeks: still stable at more than 8000 times without damage).

[0026] The compound of two different particle sizes of silica sol (small particle size modified silica sol+large particle size modified silica sol) is reasonably matched (particle size matching, proportion matching, total amount matching), as the film-forming material of the inorganic coating, which can significantly improve the compactness and stain resistance of the paint film, and if the stain-resistant emulsion and scratch-resistant aid are used as auxiliary film-forming materials, the stain resistance (footprint, pen mark, etc.) of the paint film can be significantly enhanced.

[0027] Compared with the prior art, the application has the following beneficial effects: the application can effectively solve the problems of poor scrubbing resistance and unstable scrubbing resistance of the inorganic coating.

[0028] The inorganic coating prepared by the application has excellent storage stability, and the viscosity change is less than 5KU after heat storage at 50℃ for 30 days in an oven; at the same time, the inorganic coating prepared by the application has excellent environmental protection performance (0VOC, 0 formaldehyde). DETAILED DESCRIPTION

[0029] The application is further described below in combination with specific examples

[0030] Example 1

[0031] An inorganic coating, including the following components by weight:

[0032] Water 5.3 parts, silica sol complex 40 parts (8 nm small particle size silica sol 20 parts + 25 nm large particle size silica sol 20 parts), thickening agent 0.8 parts (hydroxyethyl cellulose 0.5 parts + polyurethane thickening agent 0.3 parts), dispersant 0.5 parts, wetting agent 0.1 parts, defoaming agent 0.8 parts, titanium white 11 parts, barium sulfate 5 parts, heavy calcium 20 parts, mica powder 5 parts, pure propylene emulsion 10 parts, scratch-resistant additive 1 part, film-forming additive 0.5 parts.

[0033] The preparation method is as follows:

[0034] (1) First, add water and 20 parts of 8 nm small particle size silica sol in the dispersion cylinder, then add part of the thickening agent (hydroxyethyl cellulose) at a stirring rate of 500 rpm, stir until the viscosity is obviously thickened, then add the dispersant, wetting agent and defoaming agent, and disperse for 3 minutes;

[0035] (2) Then add titanium white, barium sulfate, heavy calcium and mica powder at a stirring rate of 1300 rpm, continue to stir for 15 minutes until the fineness is detected to be less than 50 μm;

[0036] (3) Then add the emulsion at a stirring rate of 1000 rpm, stir for 3 minutes until the emulsion is uniformly mixed;

[0037] (4) Add the remaining silica sol complex, film-forming additive, scratch-resistant additive, and remaining thickening agent (polyurethane thickening agent) in sequence, stir for 10 minutes to be in a uniform state, and filter to obtain the inorganic coating product.

[0038] Example 2

[0039] An inorganic coating, by weight parts, comprises the following components:

[0040] Water 2.3 parts, silica sol complex 43 parts (8 nm small particle size silica sol 23 parts + 25 nm large particle size silica sol 20 parts), thickening agent 0.8 parts (hydroxyethyl cellulose 0.5 parts + polyurethane thickening agent 0.3 parts), dispersant 0.5 parts, wetting agent 0.1 parts, defoaming agent 0.8 parts, titanium white 11 parts, barium sulfate 5 parts, heavy calcium 20 parts, mica powder 5 parts, pure propylene emulsion 10 parts, scratch-resistant additive 1 part, film-forming additive 0.6 parts.

[0041] The preparation method is as follows:

[0042] (1) First, add water and 23 parts of 8 nm small particle size silica sol in the dispersion cylinder, then add the thickening agent (hydroxyethyl cellulose) at a stirring rate of 400 rpm, stir until the viscosity is obviously thickened, then add the dispersant, wetting agent and defoaming agent, and disperse for 5 minutes;

[0043] (2) Then add titanium dioxide, barium sulfate, heavy calcium carbonate and mica powder under stirring rate of 1200 rpm, continue stirring for 18 minutes until the fineness test is below 50 μm;

[0044] (3) Then add the emulsion under stirring rate of 900 rpm, stir for 5 minutes until the emulsion is mixed evenly;

[0045] (4) Add the remaining silica sol compound (20 parts of 25 nm large particle size silica sol), film forming aid, scratch resistant aid, thickening agent (polyurethane thickening agent) in sequence, stir for 12 minutes until uniform, filter to obtain the inorganic coating product.

[0046] Example 3

[0047] An inorganic coating, by weight parts, comprises the following components:

[0048] Water 10 parts, silica sol compound 50 parts (30 parts of 8 nm small particle size silica sol + 20 parts of 25 nm large particle size silica sol), thickening agent 1.5 parts (1 part of hydroxyethyl cellulose + 0.5 part of polyurethane thickening agent), dispersant 1 part, wetting agent 0.5 part, defoaming agent 1 part, titanium dioxide 20 parts, barium sulfate 9 parts, heavy calcium carbonate 6 parts, mica powder 3 parts, pure acrylic emulsion 5 parts, scratch resistant aid 2 parts, film forming aid 1 part.

[0049] The preparation method is as follows:

[0050] (1) First add water and 30 parts of 8 nm small particle size silica sol in the dispersion cylinder, then add the thickening agent (hydroxyethyl cellulose) under stirring rate of 450 rpm, stir until the viscosity is obviously thickened, then add the dispersant, wetting agent and defoaming agent, disperse for 4 minutes;

[0051] (2) Then add titanium dioxide, barium sulfate, heavy calcium carbonate and mica powder under stirring rate of 1200 rpm, continue stirring for 16 minutes until the fineness test is below 50 μm;

[0052] (3) Then add the emulsion under stirring rate of 900 rpm, stir for 5 minutes until the emulsion is mixed evenly;

[0053] (4) Add the remaining silica sol compound (20 parts of 25 nm large particle size silica sol), film forming aid, scratch resistant aid, thickening agent (polyurethane thickening agent) in sequence, stir for 12 minutes until uniform, filter to obtain the inorganic coating product.

[0054] Example 4

[0055] An inorganic coating, by weight parts, comprises the following components:

[0056] Water 2 parts, silica sol composite 60 parts (8 nm small particle size silica sol 40 parts + 25 nm large particle size silica sol 20 parts), thickening agent 0.5 parts (hydroxyethyl cellulose 0.3 parts + polyurethane thickening agent 0.2 parts), dispersant 0.6 parts, wetting agent 0.2 parts, defoaming agent 0.5 parts, titanium white 10 parts, barium sulfate 7.1 parts, heavy calcium 5 parts, mica powder 4 parts, pure acrylic emulsion 9 parts, scratch-resistant additive 0.5 parts, film-forming additive 0.6 parts.

[0057] The preparation method is as follows:

[0058] (1) First, add water and 40 parts of 8 nm small particle size silica sol in the dispersion cylinder, then add the thickening agent (hydroxyethyl cellulose) at a stirring rate of 450 rpm, stir until the viscosity is obviously thickened, then add the dispersant, wetting agent and defoaming agent, and disperse for 4 minutes;

[0059] (2) Then add titanium white, barium sulfate, heavy calcium and mica powder at a stirring rate of 1200 rpm, continue stirring for 16 minutes until the fineness is detected to be less than 50 μm;

[0060] (3) Then add the emulsion at a stirring rate of 900 rpm, stir for 5 minutes until the emulsion is uniformly mixed;

[0061] (4) Add the remaining silica sol composite (20 parts of 25 nm large particle size silica sol), film-forming additive, scratch-resistant additive, thickening agent (polyurethane thickening agent) in sequence, stir for 12 min to be in a uniform state, and filter to obtain the inorganic coating product.

[0062] The above examples are for easy comparison, and the silica sol composite used is made of 8 nm small particle size silica sol and 25 nm large particle size silica sol, but the small particle size silica sol can also be other small particle size silica sol of 5-20 nm, and the large particle size silica sol can also use other large particle size silica sol of 20-100 nm. Moreover, the mass of the small particle size silica sol can also use 40-70% of the silica sol composite.

[0063] Comparative Example 1

[0064] Water 5.3 parts, modified silica sol 40 parts (8 nm modified silica sol 40 parts), thickening agent 0.8 parts (hydroxyethyl cellulose 0.5 parts + polyurethane thickening agent 0.3 parts), dispersant 0.5 parts, wetting agent 0.1 parts, defoaming agent 0.8 parts, titanium white 11 parts, barium sulfate 5 parts, heavy calcium 20 parts, mica powder 5 parts, pure acrylic emulsion 10 parts, scratch-resistant additive 1 part, film-forming additive 0.5 parts.

[0065] The difference between this comparative example and Example 1 is that only one particle size of small particle size silica sol modified silica sol is used.

[0066] Comparative Example 2

[0067] Water 5.3 parts, modified silica sol 40 parts (25 nm modified silica sol 40 parts), thickening agent 0.8 parts (hydroxyethyl cellulose 0.5 parts + polyurethane thickening agent 0.3 parts), dispersant 0.5 parts, wetting agent 0.1 parts, defoaming agent 0.8 parts, titanium white 11 parts, barium sulfate 5 parts, heavy calcium 20 parts, mica powder 5 parts, pure acrylic emulsion 10 parts, scratch-resistant additive 1 part, film-forming additive 0.5 parts.

[0068] The difference between this comparative example and Example 1 is that only one kind of large-particle-size silica sol modified silica sol having a large particle size is used.

[0069] Comparative Example 3

[0070] Water 6.3 parts, modified silica sol 40 parts (8 nm modified silica sol 20 parts + 25 nm modified silica sol 20 parts), thickening agent 0.8 parts (hydroxyethyl cellulose 0.5 parts + polyurethane thickening agent 0.3 parts), dispersant 0.5 parts, wetting agent 0.1 parts, defoaming agent 0.8 parts, titanium white 11 parts, barium sulfate 5 parts, heavy calcium 20 parts, mica powder 5 parts, pure acrylic emulsion 10 parts, film-forming additive 0.5 parts.

[0071] Comparative Example 3 does not have the scratch-resistant additive added compared to Example 1, and the present example has the scratch-resistant additive added compared to Comparative Example 3, and the stain (fountain pen) resistance is improved.

[0072] Comparative Example 4

[0073] An inorganic coating including, in parts by weight:

[0074] Water 15.3 parts, silica sol composite 30 parts (8 nm modified silica sol 150 parts + 25 nm modified silica sol 15 parts), thickening agent 0.8 parts (hydroxyethyl cellulose 0.5 parts + polyurethane thickening agent 0.3 parts), dispersant 0.5 parts, wetting agent 0.1 parts, defoaming agent 0.8 parts, titanium white 11 parts, barium sulfate 5 parts, heavy calcium 20 parts, mica powder 5 parts, pure acrylic emulsion 10 parts, scratch-resistant additive 1 part, film-forming additive 0.5 parts.

[0075] The preparation method is as follows:

[0076] (1) First, water and 20 parts of 8 nm modified silica sol are added to a dispersing cylinder, and then a thickening agent (hydroxyethyl cellulose) is added at a stirring rate of 300 rpm, and stirring is performed until the viscosity is significantly thickened, and then a dispersant, a wetting agent, and a defoaming agent are added, and dispersed for 8 minutes;

[0077] (2) Then, titanium white, barium sulfate, heavy calcium, and mica powder are added at a stirring rate of 1000 rpm, and stirring is continued for 20 minutes until the fineness is detected to be less than 50 μm;

[0078] (3) Then, under the stirring rate of 800 rpm, the emulsion was added, and stirred for 8 minutes until the emulsion was uniformly mixed;

[0079] (4) The remaining modified silica sol, film-forming aid, scratch-resistant aid, thickening agent (polyurethane thickening agent) were sequentially added, stirred for 15 min to be in a uniform state, and filtered to obtain the inorganic coating product.

[0080] Product effect test

[0081] The inorganic coatings obtained in the above examples and comparative examples were subjected to performance tests, and Table 1 shows the performance test results of the inorganic coatings.

[0082] Table 1 Performance test results of inorganic coatings

[0083]

[0084] * The water-based pen was tested using a yellow water-based pen of the morning light brand.

[0085] As shown in the above table, the inorganic coatings prepared using the conventional silica sol in Comparative Examples 1 and 2 have poor scrub resistance, especially after heat storage, and the scrub resistance is usually <6000 times. In the present application, the composite of silica sol (small particle size modified silica sol + large particle size modified silica sol) is used as the film-forming material of the inorganic coating. When the amount of silica sol exceeds a certain amount, the scrub resistance of the product is significantly improved (initial scrub resistance: >20000 times without damage; scrub resistance after 2 weeks of heat storage at 50℃: still stable at >8000 times without damage); Comparative Example 3 does not add a scratch-resistant aid, and compared with Comparative Example 3, the present application adds a scratch-resistant aid, and the stain resistance (water-based pen) is improved; the amount of the silica sol composite in Comparative Example 4 is only 30 parts, which is less than 40 parts. The silica sol composite (small particle size modified silica sol + large particle size modified silica sol) as the film-forming material of the inorganic coating shows that when the amount of silica sol is insufficient, the scrub resistance and stain resistance of the product are poor.

[0086] In summary, the composite of two different particle sizes of silica sol (small particle size modified silica sol + large particle size modified silica sol) is reasonably matched (particle size matching, ratio matching, total amount matching), which is used as the film-forming material of the inorganic coating, and can significantly improve the compactness, stain resistance and scrub resistance of the paint film. At the same time, the stain-resistant emulsion and scratch-resistant aid are used as auxiliary film-forming materials, which can significantly enhance the scrub resistance and stain resistance (footprint, water-based pen marks, etc.) of the paint film.

[0087] The raw materials of each component in the above examples are conventional raw materials known in the art.

[0088] The present application is not limited to the above-described embodiments, and simple modifications and equivalent substitutions made in accordance with the principles of the present application are within the scope of the present application.

Claims

1. An inorganic coating, characterized by: By weight, its raw materials include the following components: 2-10 parts water, 40-60 parts silica sol complex, 0.5-1.5 parts thickener, 0.5-1 part dispersant, 0.1-0.5 parts wetting agent, 0.5-1 part defoamer, 10-20 parts titanium dioxide, 5-9 parts barium sulfate, 5-20 parts heavy calcium carbonate, 3-5 parts mica powder, 5-10 parts emulsion, 0.5-2 parts scratch-resistant additive, and 0.5-1 part film-forming aid; The silica sol composite is composed of a mixture of small-particle-size silica sol with a particle size of 8 nm and large-particle-size silica sol with a particle size of 25 nm. Small-particle-size silica sol accounts for 40-70% of the mass of the silica sol composite.

2. An inorganic coating according to claim 1, characterized in that: The emulsion is one or a mixture of any two or more of the following: styrene-acrylic emulsion, pure acrylic emulsion, silicone-acrylic emulsion, and fluorocarbon emulsion, in any proportion.

3. An inorganic coating according to claim 1, characterized in that: The thickener is one or a mixture of any two or more of the following: hydroxyethyl cellulose, attapulgite, polyurethane thickener, or alkali thickener, in any proportion.

4. An inorganic coating according to claim 1, characterized in that: The dispersant is one or a mixture of any two or more sodium polycarboxylate dispersants and sodium polyacrylate dispersants in any proportion.

5. An inorganic coating according to claim 1, characterized in that: The wetting agent is one or a mixture of any two or more nonionic or anionic surfactants in any proportion.

6. An inorganic coating according to claim 1, characterized in that: The defoamer is one or a mixture of any two or more mineral oil defoamers and organosilicon defoamers in any proportion.

7. An inorganic coating according to claim 1, characterized in that: The scratch-resistant additive is an organosilicon scratch-resistant additive.

8. An inorganic coating according to claim 1, characterized in that: The titanium dioxide is rutile titanium dioxide.

9. An inorganic coating according to claim 1, characterized in that: The barium sulfate is one or a mixture of two or more types of natural barium sulfate or precipitated barium sulfate in any proportion.

10. A method for preparing an inorganic coating according to any one of claims 1-9, characterized in that: The steps include the following: (1) First, add water and part of silica sol complex to the dispersion tank, then add part of thickener at a stirring speed of 300-500 rpm, stir until the viscosity increases significantly, then add dispersant, wetting agent and defoamer, and disperse for 3-8 minutes; (2) Then add titanium dioxide, barium sulfate, heavy calcium carbonate and mica powder at a stirring speed of 1000-1300 rpm, and continue stirring for 15-20 minutes until the fineness is detected to be less than 50 μm; (3) Next, add the emulsion at a stirring speed of 800-1000 rpm and stir for 3-8 minutes until the emulsion is evenly mixed; (4) Finally, add the remaining silica sol complex, film-forming aid, scratch-resistant aid and remaining thickener, stir for 10-15 minutes until uniform, filter, and the inorganic coating is obtained.

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