Waterproof water-based single-component acrylic waterproof coating, preparation method and application thereof

Abstract

The present application relates to the technical field of waterproof coating, in particular to a waterproof and stain-resistant waterborne single-component acrylic waterproof coating, a preparation method and application thereof, and provides a waterproof and stain-resistant waterborne single-component acrylic waterproof coating, which has high hydrophobicity and low water absorption rate, and has good mechanical properties, can effectively reduce the adhesion of stains, avoid the formation of water marks at long-term water flow parts, has important significance for protecting the appearance of building outer walls and protection, and has wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of waterproof coating technology, and in particular to a waterproof and water-repellent single-component acrylic waterproof coating, its preparation method, and its application. Background Technology

[0002] Acrylic exterior wall waterproof coating is a water-based, non-toxic, odorless, and environmentally friendly waterproof coating. Its main component is pure acrylic polymer emulsion, with other additives to create a one-component water-emulsion type waterproof coating. This coating exhibits excellent aging resistance, elongation, elasticity, and adhesion, providing effective waterproof protection in various non-long-term immersion environments. Acrylic waterproof coatings are characterized by their environmental friendliness, diverse application methods, and good weather resistance. The waterproof film formed after curing possesses high elasticity, crack resistance, impermeability, and weather resistance, maintaining good performance even in harsh environments. It is widely used on building roofs and exterior walls.

[0003] Acrylic waterproof coatings are widely used in building waterproofing due to their excellent weather resistance and convenient application. However, some problems still exist in practical use: 1. High water absorption: Water-based single-component acrylic waterproof coatings need to have high elasticity, which requires a very low glass transition temperature (Tg) of the acrylic resin used. The lower the Tg of the same type of resin, the higher the water absorption rate. The higher the water absorption rate, the more material exchange occurs when the coating switches between water absorption and drying states. During this process, fine particles and impurities will be adsorbed onto the coating surface, forming stains. 2. High viscosity: While a low Tg provides high elasticity, it also makes the coating more viscous at room temperature than high Tg resins. Considering the high temperature environment outdoors, the viscosity will increase further. These two points ultimately lead to a problem: in areas with long-term water flow, such as near roof drains at the base of parapet walls, repeated rinsing by rainwater will create watermarks, affecting the building's appearance. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a waterproof and water-repellent single-component acrylic waterproof coating, the raw materials of which include:

[0005] Silicone-acrylic emulsion, waterborne polyurethane emulsion, nonionic wetting agent, nonionic dispersant, titanium dioxide, heavy calcium carbonate, mica powder, talc powder, calcined kaolin, cellulose ether, film-forming aid, AMP-95, organosilicon modifier and thickener; wherein the organosilicon modifier is an organosilicon modifier containing polysiloxane.

[0006] This invention utilizes the synergistic use of silicone-acrylic emulsion, nonionic wetting and dispersing agents, mica powder, and organosilicon modifiers containing polysiloxane to achieve a waterproof coating with both extremely low water absorption (high hydrophobicity) and good mechanical properties. The hydrophobicity of the waterproof coating surface makes it difficult for water droplets to adhere to the coating surface, effectively preventing the deposition of tiny particles in the water and achieving the effect of waterproofing.

[0007] Preferably, the silicone-acrylic emulsion is an acrylic resin containing 20%~50% (w / w) vinylsilane; the nonionic wetting agent is a branched alcohol alkoxylate nonionic wetting agent with an HLB value of 6~9; the nonionic dispersant is a polyoxyethylene ether nonionic dispersant with a solid content greater than 50%; the mica powder has an oil absorption of 45-55g / 100g; and the organosilicon modifier is an emulsion of a mixture of polysilane and polysiloxane with an effective content greater than 49% or a modified polysiloxane resin emulsion.

[0008] More preferably, the silicone-acrylic emulsion is an acrylic resin containing 20% ​​to 50% (w / w) of vinyltriethoxysilane monomer.

[0009] Preferably, the weight ratio of silicone-acrylic emulsion to nonionic wetting agent is (420~480):1; and / or, the weight ratio of silicone-acrylic emulsion to nonionic dispersant is (80~100):1.

[0010] Preferably, the weight ratio of silicone-acrylic emulsion to mica powder is (8~10):1.

[0011] Preferably, the weight ratio of silicone-acrylic emulsion to organosilicon modifier is (40~50):1.

[0012] Preferably, the mesh size of the superphosphate is 700-900 mesh; and / or, the mesh size of the mica powder is 700-900 mesh; and / or, the mesh size of the talc powder is 1100-1300 mesh; and / or, the mesh size of the kaolin is 1400-1600 mesh.

[0013] Preferably, the raw materials of the waterproof, water-based, single-component acrylic waterproof coating include the following components by weight: 400-500 parts silicone-acrylic emulsion, 20-30 parts water, 30-50 parts waterborne polyurethane emulsion, 0.5-2 parts nonionic wetting agent, 3-10 parts nonionic dispersant, 30-80 parts titanium dioxide, 180-220 parts heavy calcium carbonate, 30-80 parts mica powder, 80-120 parts talc powder, 30-80 parts calcined kaolin, 0.5-2 parts cellulose ether, 5-15 parts film-forming aid, 0.5-2 parts AMP-95, 5-15 parts organosilicon modifier, 0.5-2 parts alkali-soluble thickener, and 0.5-2 parts associative thickener.

[0014] Preferably, the raw materials of the waterproof and water-resistant single-component acrylic waterproof coating also include defoamers and preservatives;

[0015] Preferably, the raw materials also include 1-8 parts of defoamer and 1-5 parts of preservative;

[0016] Preferably, the defoamer is an organosilicon defoamer;

[0017] Preferably, the preservative is an isothiazolinone preservative.

[0018] Preferably, the film-forming aid is at least one of alcohol ester dodecyl and DOTP.

[0019] Preferably, the water absorption rate of the waterproof and water-stain-resistant single-component acrylic waterproof coating is ≤10%; more preferably, the water absorption rate is ≤5%; more preferably, the water absorption rate is ≤3%; and most preferably, the water absorption rate is ≤2.3%.

[0020] Preferably, the titanium dioxide is rutile titanium dioxide.

[0021] Most preferably, the raw materials of the waterproof, water-based, single-component acrylic waterproof coating include the following components by weight: 440-460 parts of silicone-acrylic emulsion, 22-28 parts of water, 35-45 parts of waterborne polyurethane emulsion, 0.5-1.5 parts of nonionic wetting agent, 3-8 parts of nonionic dispersant, 45-55 parts of titanium dioxide, 190-205 parts of heavy calcium carbonate, 45-55 parts of mica powder, 90-110 parts of talc powder, 45-55 parts of calcined kaolin, 0.5-1.5 parts of cellulose ether, 8-12 parts of film-forming aid, 0.5-1.5 parts of AMP-95, 8-12 parts of organosilicon modifier, 0.5-1.5 parts of alkali-soluble thickener, 0.5-1.5 parts of associative thickener, 2-6 parts of organosilicon defoamer, and 1-3 parts of isothiazolinone preservative.

[0022] Furthermore, the present invention provides a method for preparing the waterproof coating, comprising: mixing silicone-acrylic emulsion and waterborne polyurethane emulsion with water and stirring (preferably at 400-500 r / min); then adding a nonionic wetting agent and a nonionic dispersant and stirring (preferably at 400-500 r / min); then (preferably increasing the rotation speed to 1000-1200 r / min) adding titanium dioxide, calcined kaolin, talc, mica powder and heavy calcium carbonate and stirring; then (preferably decreasing the rotation speed to 400-500 r / min) adding cellulose ether and stirring; and finally adding a film-forming aid, AMP-95, an organosilicon modifier and a thickener and stirring.

[0023] Preferably, the preparation method includes: mixing silicone-acrylic emulsion and aqueous polyurethane emulsion with water and stirring; then adding defoamer, nonionic wetting agent and nonionic dispersant and stirring; then adding titanium dioxide, calcined kaolin, talc, mica powder and heavy calcium carbonate and stirring; then adding cellulose ether and stirring; finally adding film-forming aid, AMP-95, organosilicon modifier, alkali-swelling thickener, associative thickener and preservative and stirring.

[0024] Furthermore, the present invention provides the application of the waterproof coating or the waterproof coating prepared by the aforementioned method in building waterproofing.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] This invention provides a water-resistant, water-based, single-component acrylic waterproof coating, which has high hydrophobicity and low water absorption, as well as good mechanical properties. It can effectively reduce the adhesion of stains and prevent watermarks from forming on areas with long-term water flow. It is of great significance for ensuring the aesthetics and protection of building exterior walls and has broad application prospects. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. In the embodiments provided in this specification, where specific techniques or conditions are not specified, they are performed according to the techniques or conditions described in the literature in this field, or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.

[0028] In the examples below, the silicone-acrylic emulsion - BADF BD-400B emulsion is an acrylic resin containing 24% (w / w) vinyltriethoxysilane monomer; the nonionic wetting agent - Dow nonionic wetting agent CA-30 is a branched alcohol alkoxylate nonionic wetting agent with an HLB value of 8; the nonionic dispersant - BASF PX 4522 is a polyoxyethylene ether nonionic dispersant with a solid content of 51%; the oil absorption of Yuanlei 800 mesh mica powder is 47 / 100g; and the organosilicon modifier - Wacker BS1001 is an emulsion containing 50% of a mixture of polysilane and polysiloxane.

[0029] Silicone-acrylic emulsion - Shengda New Materials SD-528 is an acrylic resin containing 23% vinyltriethoxysilane monomer; Nonionic wetting agent - BASF Hydropalat WE 3323 is a branched alcohol alkoxylate nonionic wetting agent with an HLB value of 7; Nonionic dispersant - Haiming Sideqian FN-211 is a polyoxyethylene ether nonionic dispersant with a solid content of 61%; Organosilicon modifier - Tego Phobe 1650 is a modified polysiloxane resin emulsion with a content of 50%.

[0030] The silicone-acrylic emulsion, BADEFU RS-996AD, is an acrylic resin containing 18% vinyltriethoxysilane monomer; the nonionic wetting agent, Dow NP-10, is an alkylphenol polyoxyethylene ether nonionic wetting agent with an HLB value of 12; the nonionic dispersant, Dow EH-9, is a polyoxyethylene ether nonionic dispersant with a solid content of 49%; the oil absorption of Gree mica powder is 61g / 100g; and the organosilicon modifier, Mairui New Materials F103, is a polysiloxane emulsion with an effective content of 50%.

[0031] Example 1

[0032] This embodiment provides a waterproof, water-repellent, single-component acrylic waterproof coating. The raw materials include the following components by weight: 450 parts silicone-acrylic emulsion (Badfu BD-400B emulsion), 25 parts water, 40 parts waterborne polyurethane emulsion (Baolijia 5619LA emulsion), 1 part nonionic wetting agent (Dow nonionic wetting agent CA-30), 5 parts nonionic dispersant (BASF PX 4522 nonionic dispersant), 50 parts titanium dioxide (Panzhihua rutile titanium dioxide), 199 parts heavy calcium carbonate (Yuanlei 800 mesh heavy calcium carbonate), 50 parts mica powder (Yuanlei 800 mesh mica powder), 100 parts talc, 50 parts calcined kaolin (Jungao 1500 mesh calcined kaolin), 1 part cellulose ether, 10 parts film-forming aid (alcohol ester twelve), and AMP-95. 1 part of silicone modifier (Wacker BS1001), 10 parts of alkali-soluble thickener (Wanhua A406 alkali-soluble thickener), 1 part of associative thickener (Dow RM2020), 4 parts of silicone defoamer (Kefeng Chemical DA480), and 2 parts of isothiazolinone preservative (Meragal K14 from Troy, USA).

[0033] The preparation method is as follows:

[0034] The silicone-acrylic emulsion and waterborne polyurethane emulsion were mixed with water and pumped to a reactor, where they were stirred at 400 r / min. Then, defoamer, nonionic wetting agent, and nonionic dispersant were added, and the mixture was stirred at 400 r / min for 5 min. The stirring speed was then increased to 1000 r / min, and titanium dioxide, calcined kaolin, talc, mica powder, and heavy calcium carbonate were added. The mixture was stirred and dispersed at the same speed for 20 min. The stirring speed was then reduced to 400 r / min, and cellulose ether aqueous solution was added and stirred for 10 min. Finally, film-forming aid, AMP-95, organosilicon modifier, alkali-swelling thickener, associative thickener, and preservative were added and stirred for 15 min to obtain a waterproof, water-based, single-component acrylic waterproof coating.

[0035] Example 2

[0036] This embodiment provides a waterproof and stain-resistant single-component acrylic waterproof coating, which differs from Embodiment 1 only in that the raw materials include the following components by weight: 400 parts silicone-acrylic emulsion, 20 parts water, 30 parts waterborne polyurethane emulsion, 0.5 parts nonionic wetting agent, 3 parts nonionic dispersant, 30 parts titanium dioxide, 180 parts heavy calcium carbonate, 30 parts mica powder, 80 parts talc powder, 30 parts calcined kaolin, 0.5 parts cellulose ether, 5 parts film-forming aid, 0.5 parts AMP-95, 5 parts organosilicon modifier, 0.5 parts alkali-soluble thickener, 0.5 parts associative thickener, 1 part organosilicon defoamer, and 1 part isothiazolinone preservative.

[0037] Example 3

[0038] This embodiment provides a waterproof, water-repellent, single-component acrylic waterproof coating, differing from Example 1 only in that the raw materials include the following components by weight: 500 parts silicone-acrylic emulsion, 30 parts water, 50 parts waterborne polyurethane emulsion, 2 parts nonionic wetting agent, 10 parts nonionic dispersant, 80 parts titanium dioxide, 220 parts heavy calcium carbonate, 80 parts mica powder, 120 parts talc powder, 80 parts calcined kaolin, 2 parts cellulose ether, 15 parts film-forming aid, 2 parts AMP-95, 15 parts organosilicon modifier, 2 parts alkali-soluble thickener, 2 parts associative thickener, 8 parts organosilicon defoamer, and 5 parts isothiazolinone preservative. The preparation method is the same as in Example 1.

[0039] Examples 4-6

[0040] This embodiment provides a waterproof and water-repellent single-component acrylic waterproof coating, which differs from Example 1 only in that it uses other brands and models of emulsions, nonionic wetting agents, nonionic dispersants or organosilicon modifiers. Other components and "-" indicate that they are the same as in Example 1, as shown in Table 1. The preparation method is the same as in Example 1.

[0041] Table 1

[0042]

[0043] Examples 7-8

[0044] This embodiment provides a waterproof and water-repellent single-component acrylic waterproof coating, which differs from Example 1 only in that it uses other brands and models of emulsions, nonionic wetting agents, nonionic dispersants or organosilicon modifiers. Other components and "-" indicate that they are the same as in Example 1, as shown in Table 2. The preparation method is the same as in Example 1.

[0045] Table 2

[0046]

[0047] Comparative Example 1

[0048] This comparative example provides a waterproof and water-repellent single-component acrylic waterproof coating, which differs from Example 1 only in that the silicone-acrylic emulsion is replaced with an equal amount of styrene-acrylic emulsion (Bardfu 988A).

[0049] Comparative Example 2

[0050] This comparative example provides a waterproof and water-repellent single-component acrylic waterproof coating, which differs from Example 1 only in that the nonionic wetting agent is replaced with an equal amount of anionic wetting agent (SN-WET991 from Seinopco, Japan).

[0051] Comparative Example 3

[0052] This comparative example provides a waterproof and water-repellent single-component acrylic waterproof coating, which differs from Example 1 only in that the nonionic dispersant is replaced with an equal amount of anionic dispersant (SN-Dispersant 5040 from Seinopco, Japan).

[0053] Comparative Example 4

[0054] This comparative example provides a waterproof and water-stain-resistant single-component acrylic waterproof coating, which differs from Example 1 only in that the organosilicon modifier is replaced with an equal amount of fatty acid salt organosilicon modifier (Guangzhou Yifeng Chemical YF-203).

[0055] Test case

[0056] This test example tested the performance of the waterproof and water-staining single-component acrylic waterproof coatings prepared in the above examples and comparative examples. The product performance was tested according to the T-type standard of JC / T 864-2023 "Polymer Emulsion Waterproof Coatings for Buildings". The test results are shown in Table 3.

[0057] Table 3

[0058]

[0059] As can be seen from Table 3, the waterproof and water-staining single-component acrylic waterproof coatings of all embodiments of the present invention not only have low water absorption rates, but also have good mechanical properties.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water repellent water-based single-component acrylic waterproofing coating, characterized by, The raw materials include the following components by weight: 400~500 parts of silicone-acrylate emulsion, 20~30 parts of water, 30~50 parts of water-based polyurethane emulsion, 0.5~2 parts of non-ionic wetting agent, 3~10 parts of non-ionic dispersing agent, 30~80 parts of titanium white, 180~220 parts of heavy calcium carbonate, 30~80 parts of mica powder, 80~120 parts of talc, 30~80 parts of calcined kaolin, 0.5~2 parts of cellulose ether, 5~15 parts of film-forming aid, 0.5~2 parts of AMP-95, 5~15 parts of organosilicon modifier, 0.5~2 parts of alkali swelling thickening agent, and 0.5~2 parts of associative thickening agent; the organosilicon modifier is an organosilicon modifier containing polysiloxane.

2. The water repellent coating according to claim 1, characterized in that, The silicone-acrylate emulsion is an acrylic resin containing 20%~50% vinyl silane; the non-ionic wetting agent is a branched alcohol alkoxylate non-ionic wetting agent with an HLB value of 6~9; the non-ionic dispersing agent is a polyoxyethylene ether non-ionic dispersing agent with a solid content of more than 50%; the mica powder has an oil absorption of 45-55g / 100g; and the organosilicon modifier is an emulsion of a mixture of polysilane and polysiloxane with an effective content of more than 49% or a modified polysiloxane resin emulsion.

3. The water repellent coating according to claim 1 or 2, characterized in that, The weight ratio of silicone-acrylate emulsion to non-ionic wetting agent is (420~480):1; and / or, the weight ratio of silicone-acrylate emulsion to non-ionic dispersing agent is (80~100):

1.

4. The water repellent coating according to claim 1 or 2, characterized in that, The weight ratio of silicone-acrylate emulsion to mica powder is (8~10):

1. The weight ratio of silicone-acrylate emulsion to organosilicon modifier is (40~50):

1.

5. The water repellent coating according to claim 1 or 2, characterized in that, The heavy calcium carbonate has a mesh number of 700~900 mesh; and / or, the mica powder has a mesh number of 700~900 mesh; and / or, the talc has a mesh number of 1100~1300 mesh; and / or, the kaolin has a mesh number of 1400~1600 mesh.

6. The water repellent coating according to claim 1 or 2, characterized in that, The raw materials further include a defoaming agent and a preservative.

7. The water repellent coating according to claim 6, characterized in that, 1~8 parts of defoaming agent and 1~5 parts of preservative.

8. The water repellent coating according to claim 6, characterized in that, The defoaming agent is an organosilicon-based defoaming agent.

9. The water repellent coating of claim 6, wherein, The preservative is an isothiazolinone-based preservative.

10. The water repellent coating according to claim 1 or 2, characterized in that, The water absorption of the waterproof coating is ≤10%.

11. The water repellent coating according to claim 10, characterized in that, The water absorption of the waterproof coating is ≤5%.

12. The water repellent coating of claim 10, wherein, The water absorption of the waterproof coating is ≤3%.

13. The water repellent coating of claim 10, wherein, The water absorption of the waterproof coating is ≤2.3%.

14. A method of preparing the water repellent coating according to any one of claims 1 to 13, characterized in that, It comprises: The silicone-acrylate emulsion and the water-based polyurethane emulsion are mixed with water and stirred; then the non-ionic wetting agent and the non-ionic dispersing agent are added and stirred; then the titanium white, the calcined kaolin, the talc, the mica powder and the heavy calcium carbonate are added and stirred; then the cellulose ether is added and stirred; finally, the film-forming aid, the AMP-95, the organosilicon modifier, the alkali swelling thickening agent and the associative thickening agent are added and stirred.

15. The waterproof coating of any one of claims 1~13 or prepared by the preparation method of claim 14 is applied in building waterproofing.

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