Method for preparing acrylate/ silane coupling agent shared modified casein leather finishing agent by adopting soap-free polymerization method

A silane coupling agent, leather finishing agent technology, applied in small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, leather surface treatment, etc. The elongation needs to be further improved, the casein coating has poor water resistance and poor flexural resistance, etc., to achieve the effect of good modification effect, elimination of adverse effects, and improvement of film elongation at break

Inactive Publication Date: 2013-04-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large number of hydrophilic groups and molecular secondary bonds in the casein molecule, the casein coating has the disadvantages of poor water resistance, hard and brittle film formation, and poor wet rub resistance.
[0003] At present, polyurethane, caprolactam, and vinyl monomers are mainly used for modifying casein, but each modified product has its own defects. Bring greater pollution; single acrylate monomer modified casein has poor water resistance or poor flex resistance (Zhang Qianling, Ren Xiangzhong, Li

Method used

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  • Method for preparing acrylate/ silane coupling agent shared modified casein leather finishing agent by adopting soap-free polymerization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Preparation of casein solution:

[0026] Take 5 parts by mass of casein, 1.25 parts of triethanolamine and 69 parts of deionized water, and react at a constant temperature in a water bath at 60° C. for 2 hours to obtain a casein solution;

[0027] 2) Preparation of caprolactam-modified casein emulsion:

[0028] Dissolve 1 part by mass of caprolactam in 10 parts of deionized water to obtain a caprolactam solution, adjust the temperature of the water bath to 70°C, add the caprolactam solution dropwise to the casein solution in 20 minutes, and after the dropwise addition, Insulation reaction for 2h, to obtain caprolactam-modified casein emulsion;

[0029] 3) Preparation of acrylate / silane coupling agent co-modified casein leather finishing agent:

[0030] The persulfide initiator sodium persulfate of 0.4 parts by mass is dissolved in 10 parts of deionized water to obtain an initiator solution; 1.5 parts by mass of methyl methacrylate and 6.5 parts of butyl acrylate M...

Embodiment 2

[0032] 1) Preparation of casein solution:

[0033] Take 6 parts by mass of casein, 1.5 parts of triethanolamine and 63 parts of deionized water, and react at a constant temperature in a water bath at 62° C. for 2 hours to obtain a casein solution;

[0034] 2) Preparation of caprolactam-modified casein emulsion:

[0035] Dissolve 2 parts by mass of caprolactam in 11 parts of deionized water to obtain a caprolactam solution, adjust the temperature of the water bath to 74°C, add the caprolactam solution dropwise to the casein solution within 25 minutes, and after the dropwise addition, Insulated for 2.5 hours to obtain a caprolactam-modified casein emulsion;

[0036] 3) Preparation of acrylate / silane coupling agent co-modified casein leather finishing agent:

[0037]The persulfide initiator potassium persulfate of 0.5 parts by mass is dissolved in 11 parts of deionized water to obtain an initiator solution; 2 parts by mass of methyl methacrylate and 7 parts of butyl acrylate M...

Embodiment 3

[0039] 1) Preparation of casein solution:

[0040] Take 7 parts by mass of casein, 1.75 parts of triethanolamine and 56 parts of deionized water, and react at a constant temperature in a water bath at 65° C. for 3 hours to obtain a casein solution;

[0041] 2) Preparation of caprolactam-modified casein emulsion:

[0042] Dissolve 3 parts by mass of caprolactam in 12 parts of deionized water to obtain a caprolactam solution, adjust the temperature of the water bath to 78°C, add the caprolactam solution dropwise to the casein solution in 30 minutes, after the dropwise addition, Insulated for 2.5 hours to obtain a caprolactam-modified casein emulsion;

[0043] 3) Preparation of acrylate / silane coupling agent co-modified casein leather finishing agent:

[0044] The persulfide initiator ammonium persulfate that is 0.6 parts by mass is dissolved in 12 parts of deionized water to obtain an initiator solution; 2.5 parts by mass of methyl methacrylate and 7.5 parts of butyl acrylate ...

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Abstract

Provided is a method for preparing acrylate/ silane coupling agent shared modified casein leather finishing agent by adopting a soap-free polymerization method. The method comprises the following steps: firstly, dissolving dry casein with triethanolamine and water, obtaining casein dissolved solution, adding dropwisely caprolactam solution into the casein dissolved solution, obtaining modified casein emulsion of caprolactam, then under the effect of persulfide initiator, adopting a semicontinuous seed emulsifier-free emulsion polymerization method, adding simultaneously methyl methacrylate, butyl acrylate and silane coupling agent to the modified casein emulsion of the caprolactam, and obtaining the acrylate/ silane coupling agent shared modified casein leather finishing agent through free radical polymerization. According to the method for preparing the acrylate/ silane coupling agent shared modified casein leather finishing agent by adopting the soap-free polymerization method, the casein is adopted to be as raw materials, health performance is good, gloss is natural, hand touch is comfortable and dry, emulgator is not added, adverse impact of the emulgator is eliminated, and the extensibility and a water resisting property of a film of the prepared acrylate/ silane coupling agent shared modified casein leather finishing agent are remarkably improved.

Description

technical field [0001] The invention relates to a method for modifying a casein leather finishing agent, in particular to a method for preparing an acrylate / silane coupling agent co-modified casein leather finishing agent by a soap-free polymerization method. Background technique [0002] As one of the most widely used film-forming agents for leather finishing agents, casein has strong adhesion to leather and is not easy to fall off; and the formed film has good temperature resistance, light resistance, iron resistance, good hygienic performance, and water permeability Good steam and other advantages. However, because casein molecules contain a large number of hydrophilic groups and molecular secondary bonds, casein coatings have disadvantages such as poor water resistance, hard and brittle film formation, and poor wet rub resistance. [0003] At present, polyurethane, caprolactam, and vinyl monomers are mainly used for modifying casein, but each modified product has its ow...

Claims

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Application Information

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IPC IPC(8): C08F289/00C08F220/14C08F220/18C08F230/08C08H1/00C09D151/00C14C11/00
Inventor 马建中乔滢寰周建华徐群娜
Owner SHAANXI UNIV OF SCI & TECH
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