Preparation method of water-based leveling agent with good foam inhibition effect

Abstract

The invention provides a preparation method of a water-based leveling agent with a good foam inhibition effect, which comprises the following steps: dissolving an emulsifier in 30-40 parts by weight of deionized water, uniformly stirring, adding polyethylene glycol methyl acrylate and a mixed monomer, and emulsifying for 20-30 minutes to obtain a pre-emulsion; the water-based leveling agent prepared from multiple components has excellent surface tension and foam inhibition performance, the modified filler can make the leveling agent have a better foam inhibition effect, and the surface tension is improved through compounding and synergistic playing of the emulsifier and the monomer.

Description

Technical Field

[0001] The invention belongs to the technical field of leveling agents, and in particular relates to a method for preparing a water-based leveling agent with good anti-foaming effect. Background Art

[0002] With the strengthening of environmental awareness, water-based paint is gradually replacing the previous oil-based paint. The surface energy of water is very high, and it is difficult to wet the substrate with low surface energy. Therefore, to achieve good wetting and spreading effects, it is necessary to select a suitable substrate wetting agent. However, for the dynamic construction process of paint spraying, it is not enough to reduce the surface tension to achieve wetting and leveling, but to meet the requirements of reducing the dynamic surface tension, low foaming and unstable foaming, good water sensitivity, and the paint film can be quickly adjusted and leveled under high temperature baking conditions.

[0003] Leveling agents used in water-based paints can effectively reduce the surface tension of the paint, which helps the paint to spread quickly after coating, forming a smoother liquid film and reducing defects such as orange peel and ripples on the paint film surface. Improve fluidity and wettability: By improving the fluidity of the paint, the leveling agent enables the paint to better wet the substrate, especially for complex surfaces or hygroscopic substrates, which helps to improve the uniformity of the coating. Prevent defect formation: The leveling agent helps prevent surface defects such as brush marks, shrinkage holes, pinholes, etc. that appear during the drying process of the paint, ensuring a smooth appearance of the coating. Increase coverage: By improving the permeability and covering ability of the paint, the leveling agent can make it easier for the paint to fill in the tiny depressions on the surface of the substrate when applying, improving the overall uniformity and hiding power of the coating. Promote film quality: During the drying and film-forming process, the leveling agent can promote the formation of a continuous, dense and smooth coating film, enhancing the physical and mechanical properties and aesthetics of the paint film.

[0004] The static surface tension and dynamic surface tension of the leveling agent currently on the market are relatively high, and the foam stabilization problem cannot be effectively improved. Therefore, a water-based leveling agent with good foam suppression effect and a preparation method thereof are urgently needed. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing a water-based leveling agent with good anti-foaming effect.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A method for preparing a water-based leveling agent with good anti-foaming effect comprises the following steps: (1) dissolving the emulsifier in 30-40 parts by weight of deionized water, stirring evenly, adding polyethylene glycol methyl acrylate and mixed monomers, and emulsifying for 20-30 minutes to obtain a pre-emulsion; (2) mixing potassium persulfate and 3-5 parts by weight of deionized water to obtain a potassium persulfate solution; (3) Mix the remaining deionized water and 1 / 2 weight of potassium persulfate solution, add the pre-emulsion accounting for 12%-14% of the total amount of the pre-emulsion dropwise, and after the addition is complete, prepolymerize at a constant temperature for 50-60 minutes to obtain a prepolymer; (4) Add the remaining pre-emulsion and potassium persulfate solution to the prepolymer. After the addition is completed, add the modified nanofiller and keep the temperature at 80-83°C for 1-3 hours under stirring. Then increase the temperature to 90-93°C and keep the temperature for 1-2 hours. Then cool to 40-45°C and filter. Add ethylene glycol butyl ether and stir evenly to obtain a water-based leveling agent.

[0007] Preferably, the water-based leveling agent is composed of the following raw materials in parts by weight: 25-30 parts of polyethylene glycol methyl acrylate, 45-50 parts of mixed monomers, 3-11 parts of emulsifier, 1-3 parts of potassium persulfate, 20-30 parts of ethylene glycol butyl ether, 6-12 parts of modified nanomaterials, and 50-60 parts of deionized water; The mixed monomer is a mixture of methacrylic acid monomer, hydroxyethyl methacrylate, and N,N-methylenebisacrylamide in a mass ratio of 1:1.3-1.6:0.4-0.7; The emulsifier is at least one of Tween 60, Span 80, isomeric tridecanol polyoxyethylene ether, palmityl alcohol polyoxyethylene ether, sodium dodecylbenzene sulfonate and sodium dodecyl sulfate.

[0008] Preferably, the emulsifier is a mixture of Span 80, isomeric tridecanol polyoxyethylene ether and palmityl alcohol polyoxyethylene ether in a mass ratio of 0.3-0.6:1:1.2-1.5.

[0009] Preferably, M of allyl polyether methyl ester is W is 5000.

[0010] Preferably, the preparation method of the modified nanomaterial is: (1) Mixing nano-alumina, nano-silicon dioxide and nano-titanium dioxide to obtain a mixed nano-material; (2) Mix 10 parts of mixed nanomaterials, 0.1-0.2 parts of silane coupling agent KH550, and 60-80 parts of acetone, stir at 45-55°C for 40-60 minutes; continue to heat to 110-120°C, continue to add 0.3-0.4 parts of isopropyl distearoyloxyaluminate, stir for 30-50 minutes, filter, wash and dry to obtain modified nanofiller.

[0011] Preferably, the mass ratio of nano-alumina, nano-silicon dioxide and nano-titanium dioxide is 1:1.4-1.6:0.3-0.5.

[0012] Preferably, the particle size of nano-alumina is 10-50 nm; the particle size of nano-silicon dioxide is 100-200 nm; and the particle size of nano-titanium dioxide is 300-500 nm.

[0013] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: the surface tension and anti-foaming performance of the water-based leveling agent prepared by the present invention through multiple components are excellent, the modified filler can make the anti-foaming effect of the leveling agent better, and the surface tension is improved by compounding the emulsifier and the monomer to work synergistically. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Example 1 The present embodiment provides a water-based leveling agent with good anti-foaming effect, which is composed of the following raw materials in parts by weight: 27 parts of polyethylene glycol methyl acrylate, 48 parts of mixed monomers, 6 parts of emulsifier, 2 parts of potassium persulfate, 24 parts of ethylene glycol butyl ether, 9 parts of modified nanomaterials, and 55 parts of deionized water.

[0016] The mixed monomer is a mixture of methacrylic acid monomer, hydroxyethyl methacrylate and N,N-methylenebisacrylamide in a mass ratio of 1:1.5:0.6.

[0017] The emulsifier is a mixture of Span 80, isomeric tridecanol polyoxyethylene ether and palmityl alcohol polyoxyethylene ether in a mass ratio of 0.5:1:1.4.

[0018] Allyl polyether methyl ester W 5000. CAS: 32171-39-4.

[0019] The preparation method of the modified nanomaterial is: (1) Mixing nano-alumina, nano-silicon dioxide and nano-titanium dioxide to obtain a mixed nano-material; (2) 10 parts of mixed nanomaterials, 0.16 parts of silane coupling agent KH550 and 70 parts of acetone were mixed, stirred at 50°C for 50 min; the temperature was continued to rise to 115°C, and 0.35 parts of isopropyl distearoyloxyaluminate (CAS: 5919-73-3) was continued to be added, stirred for 40 min, filtered, washed and dried to obtain a modified nanofiller.

[0020] The mass ratio of nano-alumina, nano-silicon dioxide and nano-titanium dioxide is 1:1.5:0.4.

[0021] The particle size of nano-alumina is 10-50nm; the particle size of nano-silicon dioxide is 100-200nm; the particle size of nano-titanium dioxide is 300-500nm.

[0022] The preparation method of the water-based leveling agent comprises the following steps: (1) dissolving the emulsifier in 35 parts by weight of deionized water, stirring evenly, adding polyethylene glycol methyl acrylate and the mixed monomer, and emulsifying for 25 minutes to obtain a pre-emulsion; (2) mixing potassium persulfate and 4 parts by weight of deionized water to obtain a potassium persulfate solution; (3) Mix the remaining deionized water and 1 / 2 weight of potassium persulfate solution, add the pre-emulsion accounting for 13% of the total amount of the pre-emulsion dropwise, and after the addition is complete, prepolymerize at a constant temperature for 55 minutes to obtain a prepolymer; (4) Add the remaining pre-emulsion and potassium persulfate solution dropwise to the prepolymer. After the addition is complete, add the modified nanofiller and keep the mixture at 82°C for 2 h under stirring. Then, raise the temperature to 92°C and keep the mixture for 1.5 h. Then, cool the mixture to 42°C and filter. Add ethylene glycol butyl ether and stir well to obtain a water-based leveling agent.

[0023] Example 2 The present embodiment provides a water-based leveling agent with good anti-foaming effect, which is composed of the following raw materials in parts by weight: 25 parts of polyethylene glycol methyl acrylate, 45 parts of mixed monomers, 3 parts of emulsifier, 1 part of potassium persulfate, 20 parts of ethylene glycol butyl ether, 6 parts of modified nanomaterials, and 50 parts of deionized water.

[0024] The mixed monomer is a mixture of methacrylic acid monomer, hydroxyethyl methacrylate and N,N-methylenebisacrylamide in a mass ratio of 1:1.3:0.4.

[0025] The emulsifier is a mixture of Span 80, isomeric tridecanol polyoxyethylene ether and palmityl alcohol polyoxyethylene ether in a mass ratio of 0.3:1:1.2.

[0026] Allyl polyether methyl ester W 5000. CAS: 32171-39-4.

[0027] The preparation method of the modified nanomaterial is: (1) Mixing nano-alumina, nano-silicon dioxide and nano-titanium dioxide to obtain a mixed nano-material; (2) 10 parts of mixed nanomaterials, 0.1 parts of silane coupling agent KH550 and 60 parts of acetone were mixed, stirred at 45°C for 40 minutes; the temperature was continued to rise to 110°C, and 0.3 parts of isopropyl distearoyloxyaluminate (CAS: 5919-73-3) was continued to be added, stirred for 30 minutes, filtered, washed and dried to obtain a modified nanofiller.

[0028] The mass ratio of nano-alumina, nano-silicon dioxide and nano-titanium dioxide is 1:1.4:0.3.

[0029] The particle size of nano-alumina is 10-50nm; the particle size of nano-silicon dioxide is 100-200nm; the particle size of nano-titanium dioxide is 300-500nm.

[0030] The preparation method of the water-based leveling agent comprises the following steps: (1) dissolving the emulsifier in 30 parts by weight of deionized water, stirring evenly, adding polyethylene glycol methyl acrylate and the mixed monomer, and emulsifying for 20 minutes to obtain a pre-emulsion; (2) mixing potassium persulfate and 3 parts by weight of deionized water to obtain a potassium persulfate solution; (3) Mix the remaining deionized water and 1 / 2 weight of potassium persulfate solution, add dropwise the pre-emulsion accounting for 12% of the total amount of the pre-emulsion, and after the addition is complete, prepolymerize at a constant temperature for 50 minutes to obtain a prepolymer; (4) Add the remaining pre-emulsion and potassium persulfate solution dropwise to the prepolymer. After the addition is complete, add the modified nanofiller and keep the mixture at 80°C for 1 hour with stirring. Then, raise the temperature to 90°C and keep the mixture for 1 hour. Then, cool the mixture to 40°C and filter. Add ethylene glycol butyl ether and stir well to obtain a water-based leveling agent.

[0031] Example 3 The present embodiment provides a water-based leveling agent with good anti-foaming effect, which is composed of the following raw materials in parts by weight: 30 parts of polyethylene glycol methyl acrylate, 50 parts of mixed monomers, 11 parts of emulsifier, 3 parts of potassium persulfate, 30 parts of ethylene glycol butyl ether, 12 parts of modified nanomaterials, and 60 parts of deionized water.

[0032] The mixed monomer is a mixture of methacrylic acid monomer, hydroxyethyl methacrylate and N,N-methylenebisacrylamide in a mass ratio of 1:1.6:0.7.

[0033] The emulsifier is a mixture of Span 80, isomeric tridecanol polyoxyethylene ether and palmityl alcohol polyoxyethylene ether in a mass ratio of 0.6:1:1.5.

[0034] Allyl polyether methyl ester W 5000. CAS: 32171-39-4.

[0035] The preparation method of the modified nanomaterial is: (1) Mixing nano-alumina, nano-silicon dioxide and nano-titanium dioxide to obtain a mixed nano-material; (2) 10 parts of mixed nanomaterials, 0.2 parts of silane coupling agent KH550 and 80 parts of acetone were mixed, stirred at 55°C for 60 minutes; the temperature was continued to rise to 120°C, and 0.4 parts of isopropyl distearoyloxyaluminate (CAS: 5919-73-3) was continued to be added, stirred for 50 minutes, filtered, washed and dried to obtain a modified nanofiller.

[0036] The mass ratio of nano-alumina, nano-silicon dioxide and nano-titanium dioxide is 1:1.6:0.5.

[0037] The particle size of nano-alumina is 10-50nm; the particle size of nano-silicon dioxide is 100-200nm; the particle size of nano-titanium dioxide is 300-500nm.

[0038] The preparation method of the water-based leveling agent comprises the following steps: (1) dissolving the emulsifier in 40 parts by weight of deionized water, stirring evenly, adding polyethylene glycol methyl acrylate and the mixed monomer, and emulsifying for 30 minutes to obtain a pre-emulsion; (2) mixing potassium persulfate and 5 parts by weight of deionized water to obtain a potassium persulfate solution; (3) Mix the remaining deionized water and 1 / 2 weight of potassium persulfate solution, add dropwise the pre-emulsion accounting for 14% of the total amount of the pre-emulsion, and after the addition is completed, prepolymerize at a constant temperature for 60 minutes to obtain a prepolymer; (4) Add the remaining pre-emulsion and potassium persulfate solution dropwise to the prepolymer. After the addition is complete, add the modified nanofiller and keep the mixture at 83°C for 3 h under stirring. Then increase the temperature to 93°C and keep the mixture for 2 h. Then, cool the mixture to 45°C and filter. Add ethylene glycol butyl ether and stir well to obtain a water-based leveling agent.

[0039] Comparative Example 1 The difference between this comparative example and Example 1 is that the mixed monomer is a mixture of methacrylic acid monomer, hydroxyethyl methacrylate and N,N-methylenebisacrylamide in a mass ratio of 1:1:1.

[0040] The invention discloses a water-based leveling agent with good anti-foaming effect, which is composed of the following raw materials in parts by weight: 27 parts of polyethylene glycol methyl acrylate, 48 parts of mixed monomers, 6 parts of emulsifiers, 2 parts of potassium persulfate, 24 parts of ethylene glycol butyl ether, 9 parts of modified nanomaterials and 55 parts of deionized water.

[0041] The mixed monomer is a mixture of methacrylic acid monomer, hydroxyethyl methacrylate and N,N-methylenebisacrylamide in a mass ratio of 1:1:1.

[0042] The emulsifier is a mixture of Span 80, isomeric tridecanol polyoxyethylene ether and palmityl alcohol polyoxyethylene ether in a mass ratio of 0.5:1:1.4.

[0043] Allyl polyether methyl ester W 5000. CAS: 32171-39-4.

[0044] The preparation method of the modified nanomaterial is: (1) Mixing nano-alumina, nano-silicon dioxide and nano-titanium dioxide to obtain a mixed nano-material; (2) 10 parts of mixed nanomaterials, 0.16 parts of silane coupling agent KH550 and 70 parts of acetone were mixed, stirred at 50°C for 50 min; the temperature was continued to rise to 115°C, and 0.35 parts of isopropyl distearoyloxyaluminate (CAS: 5919-73-3) was continued to be added, stirred for 40 min, filtered, washed and dried to obtain a modified nanofiller.

[0045] The mass ratio of nano-alumina, nano-silicon dioxide and nano-titanium dioxide is 1:1.5:0.4.

[0046] The particle size of nano-alumina is 10-50nm; the particle size of nano-silicon dioxide is 100-200nm; the particle size of nano-titanium dioxide is 300-500nm.

[0047] The preparation method of the water-based leveling agent comprises the following steps: (1) dissolving the emulsifier in 35 parts by weight of deionized water, stirring evenly, adding polyethylene glycol methyl acrylate and the mixed monomer, and emulsifying for 25 minutes to obtain a pre-emulsion; (2) mixing potassium persulfate and 4 parts by weight of deionized water to obtain a potassium persulfate solution; (3) Mix the remaining deionized water and 1 / 2 weight of potassium persulfate solution, add the pre-emulsion accounting for 13% of the total amount of the pre-emulsion dropwise, and after the addition is complete, prepolymerize at a constant temperature for 55 minutes to obtain a prepolymer; (4) Add the remaining pre-emulsion and potassium persulfate solution dropwise to the prepolymer. After the addition is complete, add the modified nanofiller and keep the mixture at 82°C for 2 h under stirring. Then, raise the temperature to 92°C and keep the mixture for 1.5 h. Then, cool the mixture to 42°C and filter. Add ethylene glycol butyl ether and stir well to obtain a water-based leveling agent.

[0048] Comparative Example 2 The difference between this comparative example and Example 1 is that the emulsifier is a mixture of Span 80, isomeric tridecanol polyoxyethylene ether and palmityl alcohol polyoxyethylene ether in a mass ratio of 1:1:1.

[0049] The invention discloses a water-based leveling agent with good anti-foaming effect, which is composed of the following raw materials in parts by weight: 27 parts of polyethylene glycol methyl acrylate, 48 parts of mixed monomers, 6 parts of emulsifiers, 2 parts of potassium persulfate, 24 parts of ethylene glycol butyl ether, 9 parts of modified nanomaterials and 55 parts of deionized water.

[0050] The mixed monomer is a mixture of methacrylic acid monomer, hydroxyethyl methacrylate and N,N-methylenebisacrylamide in a mass ratio of 1:1.5:0.6.

[0051] The emulsifier is a mixture of Span 80, isomeric tridecanol polyoxyethylene ether and palmityl alcohol polyoxyethylene ether in a mass ratio of 1:1:1.

[0052] Allyl polyether methyl ester W 5000. CAS: 32171-39-4.

[0053] The preparation method of the modified nanomaterial is: (1) Mixing nano-alumina, nano-silicon dioxide and nano-titanium dioxide to obtain a mixed nano-material; (2) 10 parts of mixed nanomaterials, 0.16 parts of silane coupling agent KH550 and 70 parts of acetone were mixed, stirred at 50°C for 50 min; the temperature was continued to rise to 115°C, and 0.35 parts of isopropyl distearoyloxyaluminate (CAS: 5919-73-3) was continued to be added, stirred for 40 min, filtered, washed and dried to obtain a modified nanofiller.

[0054] The mass ratio of nano-alumina, nano-silicon dioxide and nano-titanium dioxide is 1:1.5:0.4.

[0055] The particle size of nano-alumina is 10-50nm; the particle size of nano-silicon dioxide is 100-200nm; the particle size of nano-titanium dioxide is 300-500nm.

[0056] The preparation method of the water-based leveling agent comprises the following steps: (1) dissolving the emulsifier in 35 parts by weight of deionized water, stirring evenly, adding polyethylene glycol methyl acrylate and the mixed monomer, and emulsifying for 25 minutes to obtain a pre-emulsion; (2) mixing potassium persulfate and 4 parts by weight of deionized water to obtain a potassium persulfate solution; (3) Mix the remaining deionized water and 1 / 2 weight of potassium persulfate solution, add the pre-emulsion accounting for 13% of the total amount of the pre-emulsion dropwise, and after the addition is complete, prepolymerize at a constant temperature for 55 minutes to obtain a prepolymer; (4) Add the remaining pre-emulsion and potassium persulfate solution dropwise to the prepolymer. After the addition is complete, add the modified nanofiller and keep the mixture at 82°C for 2 h under stirring. Then, raise the temperature to 92°C and keep the mixture for 1.5 h. Then, cool the mixture to 42°C and filter. Add ethylene glycol butyl ether and stir well to obtain a water-based leveling agent.

[0057] Comparative Example 3 The difference between this comparative example and Example 1 is that the mass ratio of nano-alumina, nano-silicon dioxide and nano-titanium dioxide is 1:1:1.

[0058] The invention discloses a water-based leveling agent with good anti-foaming effect, which is composed of the following raw materials in parts by weight: 27 parts of polyethylene glycol methyl acrylate, 48 parts of mixed monomers, 6 parts of emulsifiers, 2 parts of potassium persulfate, 24 parts of ethylene glycol butyl ether, 9 parts of modified nanomaterials and 55 parts of deionized water.

[0059] The mixed monomer is a mixture of methacrylic acid monomer, hydroxyethyl methacrylate and N,N-methylenebisacrylamide in a mass ratio of 1:1.5:0.6.

[0060] The emulsifier is a mixture of Span 80, isomeric tridecanol polyoxyethylene ether and palmityl alcohol polyoxyethylene ether in a mass ratio of 0.5:1:1.4.

[0061] Allyl polyether methyl ester W 5000. CAS: 32171-39-4.

[0062] The preparation method of the modified nanomaterial is: (1) Mixing nano-alumina, nano-silicon dioxide and nano-titanium dioxide to obtain a mixed nano-material; (2) 10 parts of mixed nanomaterials, 0.16 parts of silane coupling agent KH550 and 70 parts of acetone were mixed, stirred at 50°C for 50 min; the temperature was continued to rise to 115°C, and 0.35 parts of isopropyl distearoyloxyaluminate (CAS: 5919-73-3) was continued to be added, stirred for 40 min, filtered, washed and dried to obtain a modified nanofiller.

[0063] The mass ratio of nano-alumina, nano-silicon dioxide and nano-titanium dioxide is 1:1:1.

[0064] The particle size of nano-alumina is 10-50nm; the particle size of nano-silicon dioxide is 100-200nm; the particle size of nano-titanium dioxide is 300-500nm.

[0065] The preparation method of the water-based leveling agent comprises the following steps: (1) dissolving the emulsifier in 35 parts by weight of deionized water, stirring evenly, adding polyethylene glycol methyl acrylate and the mixed monomer, and emulsifying for 25 minutes to obtain a pre-emulsion; (2) mixing potassium persulfate and 4 parts by weight of deionized water to obtain a potassium persulfate solution; (3) Mix the remaining deionized water and 1 / 2 weight of potassium persulfate solution, add the pre-emulsion accounting for 13% of the total amount of the pre-emulsion dropwise, and after the addition is complete, prepolymerize at a constant temperature for 55 minutes to obtain a prepolymer; (4) Add the remaining pre-emulsion and potassium persulfate solution dropwise to the prepolymer. After the addition is complete, add the modified nanofiller and keep the mixture at 82°C for 2 h under stirring. Then, raise the temperature to 92°C and keep the mixture for 1.5 h. Then, cool the mixture to 42°C and filter. Add ethylene glycol butyl ether and stir well to obtain a water-based leveling agent.

[0066] Comparative Example 4 The difference between this comparative example and Example 1 is that the particle size of nano-alumina is 400-500nm; the particle size of nano-silicon dioxide is 10-50nm; and the particle size of nano-titanium dioxide is 100-200nm.

[0067] The invention discloses a water-based leveling agent with good anti-foaming effect, which is composed of the following raw materials in parts by weight: 27 parts of polyethylene glycol methyl acrylate, 48 parts of mixed monomers, 6 parts of emulsifiers, 2 parts of potassium persulfate, 24 parts of ethylene glycol butyl ether, 9 parts of modified nanomaterials and 55 parts of deionized water.

[0068] The mixed monomer is a mixture of methacrylic acid monomer, hydroxyethyl methacrylate and N,N-methylenebisacrylamide in a mass ratio of 1:1.5:0.6.

[0069] The emulsifier is a mixture of Span 80, isomeric tridecanol polyoxyethylene ether and palmityl alcohol polyoxyethylene ether in a mass ratio of 0.5:1:1.4.

[0070] Allyl polyether methyl ester W 5000. CAS: 32171-39-4.

[0071] The preparation method of the modified nanomaterial is: (1) Mixing nano-alumina, nano-silicon dioxide and nano-titanium dioxide to obtain a mixed nano-material; (2) 10 parts of mixed nanomaterials, 0.16 parts of silane coupling agent KH550 and 70 parts of acetone were mixed, stirred at 50°C for 50 min; the temperature was continued to rise to 115°C, and 0.35 parts of isopropyl distearoyloxyaluminate (CAS: 5919-73-3) was continued to be added, stirred for 40 min, filtered, washed and dried to obtain a modified nanofiller.

[0072] The mass ratio of nano-alumina, nano-silicon dioxide and nano-titanium dioxide is 1:1.5:0.4.

[0073] The particle size of nano-alumina is 400-500nm; the particle size of nano-silicon dioxide is 10-50nm; the particle size of nano-titanium dioxide is 100-200nm.

[0074] The preparation method of the water-based leveling agent comprises the following steps: (1) dissolving the emulsifier in 35 parts by weight of deionized water, stirring evenly, adding polyethylene glycol methyl acrylate and the mixed monomer, and emulsifying for 25 minutes to obtain a pre-emulsion; (2) mixing potassium persulfate and 4 parts by weight of deionized water to obtain a potassium persulfate solution; (3) Mix the remaining deionized water and 1 / 2 weight of potassium persulfate solution, add the pre-emulsion accounting for 13% of the total amount of the pre-emulsion dropwise, and after the addition is complete, prepolymerize at a constant temperature for 55 minutes to obtain a prepolymer; (4) Add the remaining pre-emulsion and potassium persulfate solution dropwise to the prepolymer. After the addition is complete, add the modified nanofiller and keep the mixture at 82°C for 2 h under stirring. Then, raise the temperature to 92°C and keep the mixture for 1.5 h. Then, cool the mixture to 42°C and filter. Add ethylene glycol butyl ether and stir well to obtain a water-based leveling agent.

[0075] Comparative Example 5 The difference between this comparative example and Example 1 is that the M of allyl polyether methyl ester W is 3000.

[0076] The invention discloses a water-based leveling agent with good anti-foaming effect, which is composed of the following raw materials in parts by weight: 27 parts of polyethylene glycol methyl acrylate, 48 parts of mixed monomers, 6 parts of emulsifiers, 2 parts of potassium persulfate, 24 parts of ethylene glycol butyl ether, 9 parts of modified nanomaterials and 55 parts of deionized water.

[0077] The mixed monomer is a mixture of methacrylic acid monomer, hydroxyethyl methacrylate and N,N-methylenebisacrylamide in a mass ratio of 1:1.5:0.6.

[0078] The emulsifier is a mixture of Span 80, isomeric tridecanol polyoxyethylene ether and palmityl alcohol polyoxyethylene ether in a mass ratio of 0.5:1:1.4.

[0079] Allyl polyether methyl ester W 3000. CAS: 32171-39-4.

[0080] The preparation method of the modified nanomaterial is: (1) Mixing nano-alumina, nano-silicon dioxide and nano-titanium dioxide to obtain a mixed nano-material; (2) 10 parts of mixed nanomaterials, 0.16 parts of silane coupling agent KH550 and 70 parts of acetone were mixed, stirred at 50°C for 50 min; the temperature was continued to rise to 115°C, and 0.35 parts of isopropyl distearoyloxyaluminate (CAS: 5919-73-3) was continued to be added, stirred for 40 min, filtered, washed and dried to obtain a modified nanofiller.

[0081] The mass ratio of nano-alumina, nano-silicon dioxide and nano-titanium dioxide is 1:1.5:0.4.

[0082] The particle size of nano-alumina is 10-50nm; the particle size of nano-silicon dioxide is 100-200nm; the particle size of nano-titanium dioxide is 300-500nm.

[0083] The preparation method of the water-based leveling agent comprises the following steps: (1) dissolving the emulsifier in 35 parts by weight of deionized water, stirring evenly, adding polyethylene glycol methyl acrylate and the mixed monomer, and emulsifying for 25 minutes to obtain a pre-emulsion; (2) mixing potassium persulfate and 4 parts by weight of deionized water to obtain a potassium persulfate solution; (3) Mix the remaining deionized water and 1 / 2 weight of potassium persulfate solution, add the pre-emulsion accounting for 13% of the total amount of the pre-emulsion dropwise, and after the addition is complete, prepolymerize at a constant temperature for 55 minutes to obtain a prepolymer; (4) Add the remaining pre-emulsion and potassium persulfate solution dropwise to the prepolymer. After the addition is complete, add the modified nanofiller and keep the mixture at 82°C for 2 h under stirring. Then, raise the temperature to 92°C and keep the mixture for 1.5 h. Then, cool the mixture to 42°C and filter. Add ethylene glycol butyl ether and stir well to obtain a water-based leveling agent.

[0084] Performance Testing The performance of the water-based leveling agents of Examples 1-3 and Comparative Examples 1-4 was tested.

[0085] 1. Surface tension test Static surface tension is tested using the platinum plate method, using a 0.1% aqueous solution of a leveling agent. The lower the static surface tension, the better the wetting effect on the substrate. Dynamic surface tension is tested using the maximum bubble method. The lower the dynamic surface tension, the stronger the adaptability during dynamic construction.

[0086] 2. Anti-foaming performance test Use a bubbling device for bubbling, add water-based leather-specific acrylic emulsion into the vector cylinder, add 0.5wt% of leveling agent, record the foam height after bubbling for 60s, and then record the foam height after standing for 15min (the lower the foam height, the better the anti-foaming performance).

[0087] Table 1 Performance test results

[0088] It can be seen from the above performance test results that the surface tension and anti-foaming performance of Examples 1-3 are excellent, especially the comprehensive performance of Example 1 is the most outstanding.

[0089] However, the comparative example did not adopt the necessary technical solution, resulting in its performance being significantly worse than that of the embodiment in the corresponding performance test. The above experimental results further prove the importance of the technical solution defined in the present invention to its technical effect.

[0090] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a water-based leveling agent with good anti-foaming effect, It is characterized in that The following steps are involved: (1) dissolving the emulsifier in 30-40 parts by weight of deionized water, stirring evenly, adding polyethylene glycol methyl acrylate and mixed monomers, and emulsifying for 20-30 minutes to obtain a pre-emulsion; (2) mixing potassium persulfate and 3-5 parts by weight of deionized water to obtain a potassium persulfate solution; (3) Mix the remaining deionized water and 1 / 2 weight of potassium persulfate solution, add the pre-emulsion accounting for 12%-14% of the total amount of the pre-emulsion dropwise, and after the addition is complete, prepolymerize at a constant temperature for 50-60 minutes to obtain a prepolymer; (4) Add the remaining pre-emulsion and potassium persulfate solution to the prepolymer. After the addition is completed, add the modified nanofiller and keep the temperature at 80-83°C for 1-3 hours under stirring. Then increase the temperature to 90-93°C and keep the temperature for 1-2 hours. Then cool to 40-45°C and filter. Add ethylene glycol butyl ether and stir evenly to obtain a water-based leveling agent.

2. A method for preparing a water-based leveling agent with good anti-foaming effect according to claim 1, It is characterized in that The water-based leveling agent is composed of the following raw materials in parts by weight: 25-30 parts of polyethylene glycol methyl acrylate, 45-50 parts of mixed monomers, 3-11 parts of emulsifiers, 1-3 parts of potassium persulfate, 20-30 parts of ethylene glycol butyl ether, 6-12 parts of modified nanomaterials, and 50-60 parts of deionized water; The mixed monomer is a mixture of methacrylic acid monomer, hydroxyethyl methacrylate, and N,N-methylenebisacrylamide in a mass ratio of 1:1.3-1.6:0.4-0.7; The emulsifier is at least one of Tween 60, Span 80, isomeric tridecanol polyoxyethylene ether, palmityl alcohol polyoxyethylene ether, sodium dodecylbenzene sulfonate and sodium dodecyl sulfate.

3. A method for preparing a water-based leveling agent with good anti-foaming effect according to claim 2, It is characterized in that The emulsifier is a mixture of Span 80, isomeric tridecanol polyoxyethylene ether and palmityl alcohol polyoxyethylene ether in a mass ratio of 0.3-0.6:1:1.2-1.

5.

4. A method for preparing a water-based leveling agent with good anti-foaming effect according to claim 1, It is characterized in that Allyl polyether methyl ester W is 5000.

5. A method for preparing a water-based leveling agent with good anti-foaming effect according to claim 1, It is characterized in that The preparation method of the modified nanomaterial is: (1) Mixing nano-alumina, nano-silicon dioxide and nano-titanium dioxide to obtain a mixed nano-material; (2) Mix 10 parts of mixed nanomaterials, 0.1-0.2 parts of silane coupling agent KH550, and 60-80 parts of acetone, stir at 45-55°C for 40-60 minutes; continue to heat to 110-120°C, continue to add 0.3-0.4 parts of isopropyl distearoyloxyaluminate, stir for 30-50 minutes, filter, wash and dry to obtain modified nanofiller.

6. A method for preparing a water-based leveling agent with good anti-foaming effect according to claim 5, It is characterized in that The mass ratio of nano-alumina, nano-silicon dioxide and nano-titanium dioxide is 1:1.4-1.6:0.3-0.

5.

7. The method for preparing a water-based leveling agent with good anti-foaming effect according to claim 5, It is characterized in that The particle size of nano-alumina is 10-50nm; the particle size of nano-silicon dioxide is 100-200nm; the particle size of nano-titanium dioxide is 300-500nm.

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