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Method for preparing modified casein/nanometer silica composite film-forming agent through in-situ soap-free seed emulsion polymerization

A nano-silica, emulsion polymerization technology, applied in chemical treatment of small raw hides/large raw hides/leather hides/furs, small raw hides/large raw hides/leather/fur treatment, animal husbandry, etc., to achieve dry hand and glossiness Excellent effect of natural, fastness and mechanical properties

Inactive Publication Date: 2011-08-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Syhthesis of Casein Graft Poly(acrylonitrile))[J]. Polymer.J, 1993, 25(9): 939-946.] Combining inorganic nanoparticles and modified casein can prepare environmentally friendly biodegradable casein-based nanocomposites. At present, there are few studies on this aspect to report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 2.1 parts by mass of casein, 0.525 parts of triethanolamine and 83 parts of deionized water into a three-necked flask, adjust the water bath temperature control device, make the temperature reach the set value of 68°C, and strictly control the dissolution temperature (68°C). After the casein is dissolved, keep stirring for 140 minutes to obtain the casein solution. Take 0.9 parts by mass of caprolactam, add 3.6 parts of deionized water, and stir evenly to obtain a caprolactam aqueous solution with a mass fraction of 25%; adjust the temperature control device until the temperature reaches 78°C, add the caprolactam aqueous solution dropwise, and wait until the dropwise addition is completed , and continue the heat preservation reaction for 280 minutes to obtain the caprolactam-modified casein solution. Take 0.6 parts by mass of nano-silica, add to the system and stir for 80 minutes; weigh 1 / 2 mixed acrylic monomers [1.11 parts of methyl methacrylate (MMA), 0.2 parts ...

Embodiment 2

[0022] Take 4.2 parts by mass of casein, 1.05 parts of triethanolamine and 66 parts of deionized water into a three-necked flask, adjust the water bath temperature control device to make the temperature reach the set value of 66 ° C, and strictly control the dissolution temperature (66 ° C) After the casein is dissolved, keep stirring for 130 minutes to obtain the casein solution. Take 1.8 parts by mass of caprolactam, add 7.2 parts of deionized water, and stir evenly to obtain a caprolactam aqueous solution with a mass fraction of 25%; adjust the temperature control device until the temperature reaches 78°C, add caprolactam aqueous solution dropwise, and wait until the dropwise addition is complete , and continue the heat preservation reaction for 260 minutes to obtain the caprolactam-modified casein solution. Take 1.2 parts by mass of nano-silica, add to the system and stir for 80 minutes; weigh 1 / 2 mixed acrylic monomer [2.22 parts of methyl methacrylate (MMA), 0.4 parts of...

Embodiment 3

[0024]Take 6.3 parts by mass of casein, 1.575 parts of triethanolamine and 49 parts of deionized water into a three-necked flask, adjust the water bath temperature control device to make the temperature reach the set value of 70°C, and strictly control the dissolution temperature (70°C) After the casein is dissolved, keep stirring for 150 minutes to obtain the casein solution. Take 2.7 parts by mass of caprolactam, add 10.8 parts by mass of deionized water, and stir evenly to obtain a caprolactam aqueous solution with a mass fraction of 25%; adjust the temperature control device until the temperature reaches 80°C, add caprolactam aqueous solution dropwise, and wait until the dropwise addition is complete , and continue the heat preservation reaction for 300 minutes to obtain the caprolactam-modified casein solution. Take 1.8 parts by mass of nano-silica, add to the system and stir for 90 minutes; weigh 1 / 2 mixed acrylic monomer [3.33 parts of methyl methacrylate (MMA), 0.6 par...

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Abstract

The invention belongs to the production field of a composite film-forming agent and particularly relates to a method for preparing a modified casein / nanometer silica composite film-forming agent through in-situ soap-free seed emulsion polymerization. By adopting the prior art, the formed casein film is hard and brittle, has low extensibility and poor water resistance and is easy to mildew and crack; and pure casein can not meet the industrial demands. The method uses natural protein casein molecule as main chain; and the branched chain is acrylic graft copolymer with an active reactive end group. Therefore, the modified casein has the excellent characteristics of both protein film-forming agent and acrylic resin film-forming agent and is characterized by high adhesive force, high temperature resistance, good air permeability, high water resistance, excellent mechanical properties and the like; and by introducing a defined amount of nanometer silica, the nano-effect of nanometer silicacan be shown and the mechanical properties or color development property of the product can be increased to a certain extent. When the composite film-forming agent is used for leather finishing, the coating can have excellent hygienic property, natural glossiness, higher dry rubbing resistance and mechanical properties and dry hand feeling.

Description

technical field [0001] The invention belongs to the field of composite film-forming agent production, and in particular relates to a method for preparing modified casein / nanometer silicon dioxide composite film-forming agent by in-situ soap-free seed emulsion polymerization. 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 has received more and more attention, and has been listed as one of the international frontier disciplines. As a natural polymer, casein has good adhesion, resistance to ironing, lightening, and high temperature. Casein solution has good dispersion stability and leveling effect on pigments, and has a certain film-forming effect. performance and is a fully biodegradable renewable raw material. Casein has been used since 1920 and has al...

Claims

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Application Information

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IPC IPC(8): C08F289/00C08F2/44C08F2/22C08K3/36C08H1/00C14C11/00C09D151/00C09D11/10C09D11/107
Inventor 马建中徐群娜高党鸽吕斌
Owner SHAANXI UNIV OF SCI & TECH