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Double in-situ method for preparing casein-based nano silicon dioxide composite leather finishing agent

A nano-silica, 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, casein coating and other directions, to achieve strong water resistance, The effect of excellent mechanical properties and environmental protection performance

Inactive Publication Date: 2012-06-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on introducing nanoparticles into casein substrate to prepare composite materials with excellent performance is still relatively rare, and there are only a few reports, such as the preparation of degradable foam materials by combining layered silicate montmorillonite and casein

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1: Add 2.1 parts by weight of casein, 0.525 parts by weight of triethanolamine and 33 parts by weight of deionized water into a three-necked flask, and adjust the water bath temperature control device. After the temperature reaches the set value of 65°C, strictly control the dissolution temperature to 65°C , keep stirring for 120 minutes after the casein is dissolved, and dissolve in a water bath to obtain a casein solution;

[0021] Step 2: Take 0.9 parts by weight of caprolactam, add 3.6 parts by weight of deionized water, and stir to obtain an aqueous solution of caprolactam; adjust the temperature control device until the temperature reaches 75°C, add the aqueous solution of caprolactam dropwise to the casein solution, and wait until the dropwise addition is completed. Continue the insulation reaction for 240 minutes to obtain the caprolactam-modified casein solution;

[0022] Step 3: Take 0.4 parts by weight of tetraethyl orthosilicate and 0.6 parts by weight ...

Embodiment 2

[0024] Step 1: Add 4.2 parts by weight of casein, 1 part by weight of triethanolamine and 48 parts by weight of deionized water into a three-necked flask, adjust the water bath temperature control device, and after the temperature reaches the set value of 65°C, strictly control the dissolution temperature to 65°C , keep stirring for 130 minutes after the casein is dissolved, and dissolve in a water bath to obtain a casein solution;

[0025] Step 2: Take 1.8 parts by weight of caprolactam, add 6.6 parts by weight of deionized water, and stir to obtain an aqueous solution of caprolactam; adjust the temperature control device until the temperature reaches 75°C, add the aqueous solution of caprolactam dropwise to the casein solution, and wait until the dropwise addition is completed. Continue the insulation reaction for 260 minutes to obtain a caprolactam-modified casein solution;

[0026] Step 3: Take 0.8 parts by weight of tetraethyl orthosilicate and 1.2 parts by weight of viny...

Embodiment 3

[0028] Step 1: Add 6.3 parts by weight of casein, 1.5 parts by weight of triethanolamine and 63 parts by weight of deionized water into a three-necked flask, adjust the water bath temperature control device, and after the temperature reaches the set value of 70°C, strictly control the dissolution temperature to 70°C , keep stirring for 140 minutes after the casein is dissolved, and dissolve in a water bath to obtain a casein solution;

[0029] Step 2: Take 2.7 parts by weight of caprolactam, add 9.6 parts by weight of deionized water, and stir to obtain an aqueous solution of caprolactam; adjust the temperature control device until the temperature reaches 80°C, add the aqueous solution of caprolactam dropwise to the casein solution, and wait until the dropwise addition is completed. Continue the insulation reaction for 280 minutes to obtain the caprolactam-modified casein solution;

[0030] Step 3: Take 1.2 parts by weight of tetraethyl orthosilicate and 1.2 parts by weight of...

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Abstract

The invention relates to a double in-situ method for preparing a casein-based nano silicon dioxide composite leather finishing agent. Casein has strong adhesive force, but forms a hard and fragile film with poor water resistance. The method comprises the following steps of: preparing a casein dissolving solution and an aqueous solution of caprolactam to obtain a caprolactam modified casein solution; adding 0.4 to 1.6 parts of tetraethoxysilane and 0.6 to 1.8 parts of silane coupling agent into the caprolactam modified casein solution; weighing 6.6 to 9.9 parts of mixed acrylic monomers, pouring the mixed acrylic monomers into the caprolactam modified casein solution, and stirring for emulsification; and dripping an aqueous solution of initiator into the caprolactam modified casein solution, and regulating the pH value to be 7.5 by using ammonia water to obtain the final product. The casein-based nano silicon dioxide composite leather finishing agent has the characteristics of strong adhesive force, high temperature resistance, high air permeability, high water resistance, excellent mechanical properties and the like, and is an environment-friendly material with good properties.

Description

technical field [0001] The invention relates to a preparation method of a leather finishing agent, in particular to a method for preparing a casein-based nano silicon dioxide composite leather finishing agent by a double in-situ method. Background technique [0002] With the increasing depletion of petroleum resources and the increasing environmental pollution caused by non-degradable synthetic polymer materials, the development and utilization of renewable resources and environmentally friendly materials have attracted more and more attention, and have been listed as one of the international frontier disciplines. As a natural polymer, casein has good adhesion, resistance to ironing, lightening, high temperature, good dispersion stability and leveling effect on pigments, and has certain film-forming properties, and It is a fully biodegradable raw material. As one of the most widely used water-soluble finishing materials, casein has been used since 1920 and has always occup...

Claims

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Application Information

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IPC IPC(8): C08F289/00C08F220/14C08F220/18C08F218/08C08K3/36C08H1/00C14C11/00C09D151/00
CPCC08L89/005C14C11/00C09D189/005C09D151/00C14C11/003C08H1/00C08F220/14C08K3/36C08F290/145C08F220/18C08F218/08C08F289/00C08F220/1804
Inventor 马建中徐群娜周建华高党鸽吕斌
Owner SHAANXI UNIV OF SCI & TECH
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