Anti-settling dispersant for paint coating

Abstract

The invention discloses an anti-settling dispersant for paint coating. Comprising the following raw material components in parts by weight: 60-100 parts of an anti-settling agent, 30-50 parts of a dispersing agent, 10-20 parts of a surfactant, 30-80 parts of filler, 5-8 parts of a silane coupling agent, 10-30 parts of a thickening agent, 5-15 parts of a pH regulator and 500-800 parts of water. The anti-settling dispersant disclosed by the invention is a chemical additive in the paint industry, solves the problem that particles such as pigment in paint precipitate in a system, and improves the quality and utilization rate of a paint coating; in the components, the polysiloxane diallyl terephthalate and the lithium stearate are combined for use, and the BYK163 dispersing agent and the sodium tridecyl sulfosuccinate are combined for use, so that a synergistic effect is achieved, and the corrosion resistance of the paint is enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of research and development of coating additives, and in particular relates to an anti-settling dispersant for paint coatings. Background Art

[0002] Paint is a coating that can be firmly covered on the surface of an object for protection, decoration, identification and other special purposes. It is usually composed of binders, pigments, solvents and additives, which work together to form a solid film after the paint dries. Paints can be divided into two categories according to the solvent: water-based paint and oil-based paint. Water-based paint, also known as latex paint, uses water as a solvent, dries quickly, is easy to clean, and is suitable for most home environments. Oil-based paint uses organic solvents such as turpentine or alcohol, has good durability and gloss, but requires solvents for cleaning. In addition, paints can be further classified according to gloss, purpose and composition. For example, matte paint, semi-gloss paint, high-gloss paint, etc., are suitable for different decorative needs. Types of paints also include primers, topcoats, anti-rust paints, fire-retardant paints, etc., and each paint has its specific application scenarios.

[0003] Paint will settle during storage. The hazards of paint sedimentation are mainly reflected in the following aspects: 1. Impact on paint performance: During the storage of paint, solid components such as pigments and fillers will sink to the bottom of the container, causing the uniformity of the paint to be destroyed; this phenomenon not only affects the opening effect of the can, but may also cause changes in the performance of the paint, and in severe cases may even cause the paint to be scrapped. 2. Agglomeration problem: When the sedimentation phenomenon is serious, the pigment and filler particles clump at the bottom to form dense lumps, which are difficult to disperse by stirring; this not only affects the use effect of the paint, but may also cause the paint to fail to be constructed normally. 3. Environmental risks: Harmful substances in paint such as benzene and xylene may leak into the environment during the sedimentation process, causing air and water pollution; for example, paint leaking into surface rivers will destroy the landscape and reduce dissolved oxygen in the water, leading to the death of aquatic organisms; in addition, heavy metals such as lead in paint may cause poisoning and other health problems if they enter the human body. 4. Health risks: Harmful substances in paint may volatilize during the sedimentation process, causing harm to human health; long-term inhalation of harmful gases in paint can cause symptoms such as headaches, nausea, fatigue, and in severe cases may lead to chronic poisoning. Paint sedimentation not only affects the use effect and performance of the paint, but may also cause harm to the environment and human health. Therefore, during the production and use of paint, measures should be taken to prevent the occurrence of sedimentation to ensure safety and effectiveness. Summary of the invention

[0004] The object of the present invention is to provide an anti-settling dispersant and a preparation method thereof.

[0005] An anti-settling dispersant for paint coatings comprises the following raw material components in parts by weight: 60-100 parts of anti-settling agent, 30-50 parts of dispersant, 10-20 parts of surfactant, 30-80 parts of filler, 5-8 parts of silane coupling agent, 10-30 parts of thickener, 5-15 parts of pH regulator and 500-800 parts of water.

[0006] The anti-settling agent is a mixture of polysiloxane diallyl terephthalate and lithium stearate in a mass ratio of (1-3):1.

[0007] The preparation method of the polysiloxane diallyl terephthalate is as follows: 15-20 parts of methyl propylene alcohol, 15-20 parts of terephthalic acid, 1-2 parts of concentrated sulfuric acid and 15-20 parts of toluene are taken in parts by weight, heated to 80-120° C., stirred and reacted for 2-4 hours, the obtained product is washed with sodium carbonate 2-4 times and dried, and then distilled and purified again after drying to obtain dimethyl propylene terephthalate; 10-15 parts of dimethyl propylene terephthalate, 20-30 parts of HMe2SiO(SiMe2O)2SiMe3 hydrogenated silicone oil and 0.1-0.3 parts of platinum catalyst are added into a pressure-resistant stainless steel reactor, reacted at 60-80° C. for 4-6 hours under a nitrogen atmosphere, and polysiloxane dimethyl propylene terephthalate is obtained.

[0008] The dispersant is a mixture of BYK163 dispersant and sodium tridecyl sulfosuccinate in a mass ratio of (2-4):1.

[0009] The surfactant is one or more of dodecyltrimethylammonium chloride, dodecylethoxysulfobetaine, cocamidopropyl betaine, sodium dodecylbenzenesulfonate, and sodium ethoxylated alkyl sulfate.

[0010] The filler is one or more of attapulgite, diatomaceous earth, bentonite, kaolin and calcium carbonate.

[0011] The silane coupling agent is one or more of silane coupling agent kh550, silane coupling agent kh560, silane coupling agent kh570, and silane coupling agent kh792.

[0012] The thickener is one or more of polyacrylamide, polyvinyl alcohol, polyvinyl pyrrolidone, carbopol resin, polyacrylic acid, polyacrylate copolymer emulsion, butadiene rubber and styrene-butadiene rubber.

[0013] The pH regulator is one or more of sodium bicarbonate, disodium hydrogen phosphate, sodium carbonate, sodium hydroxide, and potassium hydroxide.

[0014] The beneficial effects of the present invention are as follows: the anti-settling dispersant of the present invention is a chemical auxiliary agent in the paint industry, which solves the problem of precipitation of particles such as pigments in the paint system, and improves the quality and utilization rate of the paint coating; the combination of polysiloxane diallyl terephthalate and lithium stearate, and the combination of BYK163 dispersant and sodium tridecyl sulfosuccinate are used in the components to synergistically enhance the corrosion resistance of the paint. DETAILED DESCRIPTION

[0015] In order to facilitate the understanding of the present invention, the present invention will be described more fully below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0016] Example 1

[0017] An anti-settling dispersant for paints and coatings comprises the following raw material components in parts by weight: 80 parts of an anti-settling agent, 40 parts of a dispersant, 15 parts of dodecyltrimethylammonium chloride, 60 parts of attapulgite, 6 parts of a silane coupling agent KH550, 20 parts of polyacrylamide, 10 parts of disodium hydrogen phosphate, and 600 parts of water; the anti-settling agent is a mixture of polysiloxane diallyl terephthalate and lithium stearate in a mass ratio of 2:1; the dispersant is a mixture of BYK1 63 dispersant and sodium tridecyl sulfosuccinate in a mass ratio of 3:1.

[0018] The preparation method of the polysiloxane diallyl terephthalate is as follows: 18 parts of methyl propylene alcohol, 18 parts of terephthalic acid, 1.5 parts of concentrated sulfuric acid and 18 parts of toluene are taken according to weight parts, heated to 100° C. and stirred for reaction for 3 hours, the obtained product is washed with sodium carbonate for 3 times and dried, and after drying, it is distilled and purified again to obtain dimethyl propylene terephthalate; 12 parts of dimethyl propylene terephthalate, 25 parts of HMe2SiO(SiMe2O)2SiMe3 hydrogenated silicone oil and 0.2 parts of platinum catalyst are added into a pressure-resistant stainless steel reactor, reacted at 70° C. for 5 hours under a nitrogen atmosphere, and polysiloxane dimethyl propylene terephthalate is obtained.

[0019] Example 2

[0020] An anti-settling dispersant for paints and coatings comprises the following raw material components in parts by weight: 60 parts of an anti-settling agent, 30 parts of a dispersant, 10 parts of dodecylethoxysulfobetaine, 40 parts of diatomaceous earth, 5 parts of a silane coupling agent KH560, 10 parts of polyvinyl pyrrolidone, 5 parts of sodium hydroxide, and 500 parts of water; the anti-settling agent is a mixture of polysiloxane diallyl terephthalate and lithium stearate in a mass ratio of 1:1; the dispersant is a mixture of BYK1 63 dispersant and sodium tridecyl sulfosuccinate in a mass ratio of 2:1.

[0021] The preparation method of the polysiloxane diallyl terephthalate is as follows: 15 parts of methyl propylene alcohol, 15 parts of terephthalic acid, 1 part of concentrated sulfuric acid and 15 parts of toluene are taken according to weight parts, heated to 80°C and stirred for reaction for 2 hours, the obtained product is washed twice with sodium carbonate and dried, and after drying, it is distilled and purified again to obtain dimethyl propylene terephthalate; 10 parts of dimethyl propylene terephthalate, 20 parts of HMe2SiO(SiMe2O)2SiMe3 hydrogenated silicone oil and 0.1 parts of platinum catalyst are added into a pressure-resistant stainless steel reactor, reacted at 60°C for 4 hours under a nitrogen atmosphere, and polysiloxane dimethyl propylene terephthalate is obtained.

[0022] Example 3

[0023] An anti-settling dispersant for paints and coatings, comprising the following raw material components in parts by weight: 100 parts of anti-settling agent, 50 parts of dispersant, 20 parts of cocamidopropyl betaine, 80 parts of calcium carbonate, 28 parts of silane coupling agent KH79, 30 parts of polyacrylate copolymer emulsion, 12 parts of potassium hydroxide, and 800 parts of water; the anti-settling agent is a mixture of polysiloxane diallyl terephthalate and lithium stearate in a mass ratio of 3:1; the dispersant is a mixture of BYK163 dispersant and sodium tridecyl sulfosuccinate in a mass ratio of 4:1

[0024] The preparation method of the polysiloxane diallyl terephthalate is as follows: 20 parts of methyl propylene alcohol, 20 parts of terephthalic acid, 2 parts of concentrated sulfuric acid and 20 parts of toluene are taken according to weight parts, heated to 120° C., stirred and reacted for 4 hours, the obtained product is washed with sodium carbonate 4 times and dried, and then distilled and purified again after drying to obtain dimethyl propylene terephthalate; 15 parts of dimethyl propylene terephthalate, 30 parts of HMe2SiO(SiMe2O)2SiMe3 hydrogenated silicone oil and 0.3 parts of platinum catalyst are added into a pressure-resistant stainless steel reactor, reacted at 80° C. for 6 hours under a nitrogen atmosphere, and polysiloxane dimethyl propylene terephthalate is obtained.

[0025] Comparative Example 1

[0026] An anti-settling dispersant for paints and coatings comprises the following raw material components in parts by weight: 80 parts of polysiloxane diallyl terephthalate, 40 parts of dispersant, 15 parts of dodecyltrimethylammonium chloride, 60 parts of attapulgite, 6 parts of silane coupling agent KH550, 20 parts of polyacrylamide, 10 parts of disodium hydrogen phosphate, and 600 parts of water; the dispersant is a mixture of BYK163 dispersant and sodium tridecyl sulfosuccinate in a mass ratio of 3:1.

[0027] The preparation method of the polysiloxane diallyl terephthalate is as follows: 18 parts of methyl propylene alcohol, 18 parts of terephthalic acid, 1.5 parts of concentrated sulfuric acid and 18 parts of toluene are taken according to weight parts, heated to 100° C. and stirred for reaction for 3 hours, the obtained product is washed with sodium carbonate for 3 times and dried, and after drying, it is distilled and purified again to obtain dimethyl propylene terephthalate; 12 parts of dimethyl propylene terephthalate, 25 parts of HMe2SiO(SiMe2O)2SiMe3 hydrogenated silicone oil and 0.2 parts of platinum catalyst are added into a pressure-resistant stainless steel reactor, reacted at 70° C. for 5 hours under a nitrogen atmosphere, and polysiloxane dimethyl propylene terephthalate is obtained.

[0028] Comparative Example 2

[0029] An anti-settling dispersant for paints and coatings comprises the following raw material components in parts by weight: 80 parts of lithium stearate, 40 parts of dispersant, 15 parts of dodecyltrimethylammonium chloride, 60 parts of attapulgite, 6 parts of silane coupling agent KH550, 20 parts of polyacrylamide, 10 parts of disodium hydrogen phosphate, and 600 parts of water; the dispersant is a mixture of BYK1 63 dispersant and sodium tridecyl sulfosuccinate in a mass ratio of 3:1.

[0030] Comparative Example 3

[0031] An anti-settling dispersant for paints and coatings comprises the following raw material components in parts by weight: 80 parts of anti-settling agent, 40 parts of BYK163 dispersant, 15 parts of dodecyltrimethylammonium chloride, 60 parts of attapulgite, 6 parts of silane coupling agent KH550, 20 parts of polyacrylamide, 10 parts of disodium hydrogen phosphate, and 600 parts of water; the anti-settling agent is a mixture of polysiloxane diallyl terephthalate and lithium stearate in a mass ratio of 2:1.

[0032] The preparation method of the polysiloxane diallyl terephthalate is as follows: 18 parts of methyl propylene alcohol, 18 parts of terephthalic acid, 1.5 parts of concentrated sulfuric acid and 18 parts of toluene are taken according to weight parts, heated to 100° C. and stirred for reaction for 3 hours, the obtained product is washed with sodium carbonate for 3 times and dried, and after drying, it is distilled and purified again to obtain dimethyl propylene terephthalate; 12 parts of dimethyl propylene terephthalate, 25 parts of HMe2SiO(SiMe2O)2SiMe3 hydrogenated silicone oil and 0.2 parts of platinum catalyst are added into a pressure-resistant stainless steel reactor, reacted at 70° C. for 5 hours under a nitrogen atmosphere, and polysiloxane dimethyl propylene terephthalate is obtained.

[0033] Comparative Example 4

[0034] An anti-settling dispersant for paints and coatings comprises the following raw material components in parts by weight: 80 parts of anti-settling agent, 40 parts of sodium tridecyl sulfosuccinate, 15 parts of dodecyltrimethylammonium chloride, 60 parts of attapulgite, 6 parts of silane coupling agent KH550, 20 parts of polyacrylamide, 10 parts of disodium hydrogen phosphate, and 600 parts of water; the anti-settling agent is a mixture of polysiloxane diallyl terephthalate and lithium stearate in a mass ratio of 2:1.

[0035] The preparation method of the polysiloxane diallyl terephthalate is as follows: 18 parts of methyl propylene alcohol, 18 parts of terephthalic acid, 1.5 parts of concentrated sulfuric acid and 18 parts of toluene are taken according to weight parts, heated to 100° C. and stirred for reaction for 3 hours, the obtained product is washed with sodium carbonate for 3 times and dried, and after drying, it is distilled and purified again to obtain dimethyl propylene terephthalate; 12 parts of dimethyl propylene terephthalate, 25 parts of HMe2SiO(SiMe2O)2SiMe3 hydrogenated silicone oil and 0.2 parts of platinum catalyst are added into a pressure-resistant stainless steel reactor, reacted at 70° C. for 5 hours under a nitrogen atmosphere, and polysiloxane dimethyl propylene terephthalate is obtained.

[0036] Experimental example:

[0037] Preparation of coating: Weigh silica sol, potassium hydroxide and water in a mass ratio of 11:1:8, add silica sol to a thermostatic container with an electric stirrer, slowly add potassium hydroxide and water to the reaction container while stirring at a constant temperature of 70°C, stir the mixed solution for 10 minutes to obtain potassium silicate solution, weigh an appropriate amount of potassium silicate solution and pour it into a thermostatic container; under a constant temperature of 30°C, add silicone-acrylic emulsion while stirring, and stir for 40 minutes to obtain a modified base material, wherein the mass fraction of silicone-acrylic emulsion is 20%, and the molar ratio of silicon potassium SiO2:K2O is 5.5; add zinc powder according to the mass ratio of base material to zinc powder of 3:1. Add the anti-settling dispersant prepared in Example 1, and the added mass fractions are 0.1%, 0.3%, 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 4.0%, 5.0%, and 6.0%, respectively.

[0038] After standing for 2 hours, observe whether the coating has stratification phenomenon, and use the scraper fineness method to detect the coating fineness. The test results are shown in Table 1:

[0039] Table 1

[0040]

[0041] It can be seen from Table 1 that the anti-settling dispersant of the present invention is effective when the addition amount of the coating is within 1.0-4.0% by mass, and the optimum amount is 2.0%.

[0042] The anti-settling dispersant prepared in Examples 1-3 and Comparative Examples 1-4 was used to prepare a coating according to the above coating preparation method. The corrosion weight loss rate of the coating in w(HNO3)=0.3% was tested. Each group of experiments was measured 3 times and the average value was taken. SPSS24.0 software was used for statistical analysis. The quantitative data results were expressed as x±s (mean±standard deviation). The Kolmogorov-Smirnov test method was used for data normality test. For data that conformed to the normal distribution, the mean difference between the two groups was compared by t-test, and P<0.05 was considered statistically significant. The measurement results are shown in Table 2:

[0043] Table 2

[0044]

[0045]

[0046] Note: * represents P < 0.05 compared with the group in Example 1.

[0047] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An anti-settling dispersant for paints and coatings, characterized in that: The invention comprises the following raw material components in parts by weight: 60-100 parts of anti-settling agent, 30-50 parts of dispersant, 10-20 parts of surfactant, 30-80 parts of filler, 5-8 parts of silane coupling agent, 10-30 parts of thickener, 5-15 parts of pH regulator and 500-800 parts of water.

2. The anti-settling dispersant for paints and coatings according to claim 1, characterized in that: The anti-settling agent is a mixture of polysiloxane diallyl terephthalate and lithium stearate in a mass ratio of (1-3):

1.

3. The anti-settling dispersant for paints and coatings according to claim 2, characterized in that: The preparation method of the polysiloxane diallyl terephthalate is as follows: 15-20 parts of methyl propylene alcohol, 15-20 parts of terephthalic acid, 1-2 parts of concentrated sulfuric acid and 15-20 parts of toluene are taken in parts by weight, heated to 80-120° C., stirred and reacted for 2-4 hours, the obtained product is washed with sodium carbonate 2-4 times and dried, and then distilled and purified again after drying to obtain dimethyl propylene terephthalate; 10-15 parts of dimethyl propylene terephthalate, 20-30 parts of HMe2SiO(SiMe2O)2SiMe3 hydrogenated silicone oil and 0.1-0.3 parts of platinum catalyst are added into a pressure-resistant stainless steel reactor, reacted at 60-80° C. for 4-6 hours under a nitrogen atmosphere, and polysiloxane dimethyl propylene terephthalate is obtained.

4. The anti-settling dispersant for paints and coatings according to claim 1, characterized in that: The dispersant is a mixture of BYK163 dispersant and sodium tridecyl sulfosuccinate in a mass ratio of (2-4):

1.

5. The anti-settling dispersant for paints and coatings according to claim 1, characterized in that: The surfactant is one or more of dodecyltrimethylammonium chloride, dodecylethoxysulfobetaine, cocamidopropyl betaine, sodium dodecylbenzenesulfonate, and sodium ethoxylated alkyl sulfate.

6. The anti-settling dispersant for paints and coatings according to claim 1, characterized in that: The filler is one or more of attapulgite, diatomaceous earth, bentonite, kaolin and calcium carbonate.

7. The anti-settling dispersant for paints and coatings according to claim 1, characterized in that: The silane coupling agent is one or more of silane coupling agent kh550, silane coupling agent kh560, silane coupling agent kh570, and silane coupling agent kh792.

8. The anti-settling dispersant for paints and coatings according to claim 1, characterized in that: The thickener is one or more of polyacrylamide, polyvinyl alcohol, polyvinyl pyrrolidone, carbopol resin, polyacrylic acid, polyacrylate copolymer emulsion, butadiene rubber and styrene-butadiene rubber.

9. The anti-settling dispersant for paints and coatings according to claim 1, characterized in that: The pH regulator is one or more of sodium bicarbonate, disodium hydrogen phosphate, sodium carbonate, sodium hydroxide, and potassium hydroxide.

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