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Method for preparing polyacrylate/nano-SiO2 compound coating agent by using reactive emulsifier

A reactive emulsifier, polyacrylate technology, applied in coating, application, small raw hide/large hide/leather/fur treatment, etc., can solve the problems of limiting the development space of polymer emulsions, environmental pollution, emulsion performance defects, etc. , to reduce adverse effects, strong water resistance, and improved performance

Inactive Publication Date: 2010-09-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existence of small-molecule emulsifiers will also cause certain defects in the performance of the emulsion. Since the emulsifier molecules are in a free state in the polymer film, they are easy to migrate to the surface of the adhesive layer, so the adhesion, water resistance, heat resistance and other properties of the adhesive film Compared with solvent-based polymers, there is a big gap. At the same time, a large amount of emulsifiers will cause environmental pollution, which limits the development space of polymer emulsions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The three-necked flask was heated to 38° C. in a water bath, and 2 wt % of emulsifier 1-allyloxy-3-(4-nonylphenol)-2-propanol polyoxyethylene ether ammonium sulfate and 60 wt % of deionized water were added, Stir at a speed of 300 rpm for 20 minutes. After the emulsifier is uniformly dispersed, add 1 wt % tetraethylorthosilicate and 4 wt % silane coupling agent vinyltrimethoxysilane, and react at a constant temperature for 20 min. Add 1 / 5 mixed monomer of butyl acrylate and methyl methacrylate (the mixed monomer accounts for 25wt% of the total mass of the system, and the molar ratio of the two monomers is 3:2), raise the temperature to 70°C, and react for 30 minutes. Add the remaining mixed monomers and 0.5wt% ammonium persulfate aqueous solution dropwise respectively. After the dropwise addition, raise the temperature to 80°C and keep it warm for 2 hours; Composite finish.

Embodiment 2

[0035] The three-necked flask was heated to 40°C in a water bath, and 3 wt% of emulsifier 1-allyloxy-3-(4-nonylphenol)-2-propanol polyoxyethylene ether ammonium sulfate and 60 wt% of deionized water were added, Stir at 300rpm for 20min. After the emulsifier is uniformly dispersed, add 0.8wt% ethyl orthosilicate and 4wt% silane coupling agent tetramethyldivinyldisiloxane, and react at constant temperature for 20min. Add 1 / 5 mixed monomer of butyl acrylate and methyl methacrylate (the mixed monomer accounts for 26wt% of the total mass of the system, and the molar ratio of the two monomers is 2:1), raise the temperature to 72°C, and react for 30 minutes. Add the remaining mixed monomers and 0.6wt% potassium persulfate aqueous solution dropwise. After the dropwise addition, raise the temperature to 80°C and keep it warm for 2 hours; add sodium carbonate aqueous solution at room temperature to adjust the pH of the emulsion to about 7 to obtain a nanocomposite Finishing agent.

Embodiment 3

[0037] Heat the three-necked flask in a water bath to 42°C, add 3.5wt% emulsifier 1-allyloxy-3-(4-nonylphenol)-2-propanol polyoxyethylene ether ammonium sulfate and 62wt% deionized water , stirred at a speed of 300 rpm for 20 minutes, and after the emulsifier was uniformly dispersed, 1.5 wt % ethyl orthosilicate and 3.5 wt % silane coupling agent vinyltriethoxysilane were added, and the reaction was carried out at constant temperature for 20 min. Add 1 / 3 mixed monomer of butyl acrylate and methyl acrylate (the mixed monomer accounts for 27wt% of the total mass of the system, and the molar ratio of the two monomers is 2:1), raise the temperature to 75°C, react for 30min, and add dropwise After the remaining mixed monomers and 0.7wt% ammonium persulfate aqueous solution are added dropwise, the temperature is raised to 80°C, and the reaction is kept for 2 hours; sodium acetate aqueous solution is added at room temperature, and the pH of the emulsion is adjusted to about 7 to obtai...

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Abstract

The invention relates to a method for preparing polyacrylate / nano-SiO2 compound coating agent which is suitable for bottom layer coating in clothing leathers and instep leathers, by using a reactive emulsifier. The polyacrylate has excellent optical stability, chemical resistance and favorable adhesive property and is widely used as an adhesive, a coating film-forming agent, a functional film, and a medical polymer and in the fields of water treatment and the like, but polyacrylate emulsion has the defects of embrittlement at low temperature, stickiness and strength loss at high temperature, easy after tack and the like, which restrict the application range and the use value of the polyacrylate emulsion. In the invention, the polyacrylate / nano-SiO2 compound coating agent is prepared by substituting conventional emulsifier with reactive emulsifier by utilizing the nanometer effect of an inorganic nanometer material and synchronously adopting a conventional emulsion polymerization method and a sol-gel method. The compound coating agent prepared by the invention has fine granules, excellent adhesive force, good filling capacity, strong water resistance and flexible and transparent formed film, and meanwhile, the damages to the human body and the environment, which are caused by the use of large amount of emulsifiers, are reduced.

Description

technical field [0001] The present invention relates to a kind of adopting reactive emulsifier to prepare polyacrylate / nanometer SiO 2 The method for the composite finishing agent particularly relates to a method for the composite finishing agent suitable for the middle and bottom coating of garment leather and shoe upper leather. technical background [0002] Leather finishing is an important process in the production of leather products. It can not only increase the aesthetics of the leather surface and improve the durability of the leather, but also correct the surface defects of the leather and expand the use range and value of the leather. As the top coating material of leather, leather finishing agent has a vital impact on the appearance, hygienic performance and physical and mechanical properties of leather products. Due to its excellent light stability, chemical resistance and good bonding performance, polyacrylate is widely used as adhesives, coating film-forming a...

Claims

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Application Information

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IPC IPC(8): C09D133/08C09D7/12C08F220/18C08F2/24C08K3/36C14C11/00
Inventor 马建中刘俊莉鲍艳吕斌鲁娟郑莹
Owner SHAANXI UNIV OF SCI & TECH
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