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Method for preparing organosilicon and nano-silicon dioxide modified acrylic resin soap-free emulsion

A technology of nano-silica and acrylic resin, which is applied in the field of preparation of nano-composite coating agents, can solve the problems of poor film gloss and water resistance, poor film-forming performance, and large emulsion particle size, so as to improve water resistance and adhesion. Improved strength and small dispersion size

Inactive Publication Date: 2010-06-16
山西佳宇丰化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two main methods for the preparation of silicone-modified acrylic resin soap-free emulsions: (1) using hydrophilic non-ionic comonomers in conjunction with ionic comonomers, so that the surface of the particles has both ionic groups, and non-ionic groups, increase the stability of latex particles [Fan Xin, Zhang Xiaodong. Silicone Materials, 2003, 17 (4): 6-8.], this method has a larger particle size , poor film-forming performance, poor film gloss and water resistance, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: 1) First, mix 28% of methyl methacrylate, 66% of butyl acrylate, 2% of acrylic acid and 4% of vinyl silicone oil by mass percentage to prepare mixed monomers, the vinyl The mass content of vinyl in base silicone oil is 8%;

[0017] 2) Next, add deionized water with a mass of 108% of the mixed monomer, 0.4% potassium persulfate, and 1% allyloxynonylphenol polyoxyethylene to a three-necked flask equipped with a stirrer, a thermometer, and a feeding device (10) Ether ammonium sulfate and 1 / 3 part of mixed monomer, stir until completely dissolved, and pass nitrogen for 30 minutes;

[0018] 3) Then heat up to 80°C, then add 0.4% potassium persulfate of the mixed monomer mass, and drop the remaining 2 / 3 parts of the mixed monomer within 60 minutes. After the monomers are dropped, add 5% of the mixed monomer mass % vinyltrimethoxysilane, reacted at 80°C for 180 minutes, then lowered the temperature to 50°C, and then added tetraethyl orthosilicate with a mass of mix...

Embodiment 2

[0019] Example 2: 1) First, mix 20% methyl methacrylate, 71% 2-ethylhexyl acrylate, 3% methacrylic acid and 6% vinyl silicone oil by mass percentage to prepare a mixed monomer, the mass content of vinyl in the vinyl silicone oil is 8%;

[0020] 2) Next, add deionized water with a mass of 108% of the mixed monomer, 0.5% sodium persulfate, and 3% allyloxynonylphenol polyoxyethylene into a three-necked flask equipped with a stirrer, a thermometer, and a feeding device (10) Ether bisphosphoric acid and 1 / 3 part of mixed monomer, stir until completely dissolved, and pass nitrogen gas for 30 minutes;

[0021] 3) Then heat up to 85°C, then add 0.5% sodium persulfate of the mixed monomer mass, and drop the remaining 2 / 3 parts of the mixed monomer within 80 minutes. After the monomers are dripped, add 10% of the mixed monomer mass. % vinyltriethoxysilane, reacted at 85°C for 130 minutes, then lowered the temperature to 50°C, and then added 6% ethyl orthosilicate of mixed monomer mass ...

Embodiment 3

[0022] Embodiment 3: 1) first, by mass percentage, 40% methyl methacrylate, 45% butyl acrylate, 5% methacrylic acid and 10% vinyl silicone oil are mixed uniformly to prepare mixed monomers, the The mass content of vinyl in the vinyl silicone oil is 8%;

[0023] 2) Next, add the deionized water of 108% of the mixed monomer quality, the ammonium persulfate of 0.1%, the polyethylene glycol monoallyl ether of 2% and 1 / 3 part of mixed monomers, stirred until completely dissolved, and nitrogen for 30 minutes;

[0024] 3) Then heat up to 90°C, then add ammonium persulfate of 0.7% of the mass of the mixed monomer, and drop the remaining 2 / 3 parts of the mixed monomer within 90 minutes. After the monomers are dripped, add 1 % of γ-methacryloyloxypropyltrimethoxysilane, reacted at 90°C for 90 minutes, then lowered the temperature to 50°C, and then added 2% orthosilicate ethyl ester of mixed monomer mass to react for 12 hours.

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Abstract

The invention relates to a method for preparing an organosilicon and nano-silicon dioxide modified acrylic resin soap-free emulsion. According to the method, a reactive emulsifier is used to replace a conventional emulsifier, and the method comprises the steps of: performing soap-free emulsion polymerization on acrylic ester monomers, (methyl) acrylic acid, vinyl silicone oil and alkoxy silane containing double bonds; and then adding ethyl orthosilicate for a sol-gel reaction to obtain the organosilicon and nano-silicon dioxide modified acrylic resin soap-free emulsion. The organosilicon and nano-silicon dioxide modified acrylic resin soap-free emulsion is suitable to be taken as a leather finishing agent. The method can completely eliminate the adverse effect of a small molecular emulsifier on an acrylic resin emulsion finishing agent, introduce good characteristics of organosilicon and nano-silicon dioxide into an acrylic resin, overcome the disadvantages of hot sticking and cold shortness, poor waterproof performance and poor solvent resistance and the like of the acrylic resin, and improve the mechanical property, adhesive force and wear resistance of the acrylic resin.

Description

technical field [0001] The invention relates to a preparation technology of a nano-composite finishing agent for leather finishing, in particular to a preparation method of an organic silicon and nano silicon dioxide modified acrylic resin soap-free emulsion. Background technique [0002] As the top coating material of leather, leather finishing agent has a vital impact on the appearance, hygiene performance and physical and mechanical properties of leather products. Acrylic resin is the most widely used film-forming substance in leather finishing materials. It has the characteristics of strong adhesion, smooth coating film, brightness, flex resistance, high extensibility and stable structure; but the molecular linear structure of polyacrylate The coating film has problems such as "hot stickiness and cold brittleness", solvent resistance, and poor adhesion of the coating [Ma Jianzhong, Qing Ning, Lu Shenghua. Leather Chemicals. Beijing: Chemical Industry Press, 2001: 357.]. ...

Claims

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Application Information

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IPC IPC(8): C08F283/12C08F220/18C08F220/14C08F220/06C08F2/30C08F2/26C08F8/42
Inventor 周建华张琳
Owner 山西佳宇丰化工科技有限公司
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