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Polysiloxane-modified gelatin leather finishing agent and preparation method thereof

A technology of epoxy polysiloxane and leather finishing agent, applied in leather surface treatment, small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, etc., can solve many problems Difficult gelatin performance changes, poor film-forming properties, strong water absorption, etc., to achieve the effects of good thermal stability and air permeability, low surface tension, and strong oxidation resistance

Active Publication Date: 2013-05-08
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Gelatin has a wide range of sources and is cheap. It can be used as a finishing agent to maintain the natural luster and feel of the leather. The coating is bright, the surface is firmly bonded, it is resistant to high temperature ironing, it is suitable for polishing, and it has inherent hygienic properties. However, gelatin is used alone as a finishing agent. There are many problems, such as poor film-forming property, poor elasticity, poor elongation, easy to break, strong water absorption, not resistant to wet rubbing, etc. Chemical modification of gelatin is an effective way to solve the defects of gelatin materials
[0004] Free radical graft copolymerization and chemical crosslinking are commonly used modification methods (Das Leder, 1994, 45 (7): 142-149; China Leather, 2002, 31 (5): 1-6; Polymer, 1999, 40:773-788), on the one hand, these traditional methods are usually carried out in organic solvents, and there are problems such as solvent recovery, safety, and environmental protection; on the other hand, it is difficult to modify gelatin with short-chain compounds. Radical change in performance

Method used

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  • Polysiloxane-modified gelatin leather finishing agent and preparation method thereof
  • Polysiloxane-modified gelatin leather finishing agent and preparation method thereof
  • Polysiloxane-modified gelatin leather finishing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 12 grams of gelatin (accounting for 11.76% of the total mass) and 85 grams of deionized water into a three-neck reaction flask equipped with a thermometer socket, a sampling port, and a condenser socket, stir and heat to 50°C, and after the gelatin is completely dissolved, add 0.25 mL3 mol / liter of sodium hydroxide, adjust the reaction pH to 10.0, add 5.0g sodium dodecyl sulfate, sodium dodecylbenzenesulfonate and sorbitol mixed surfactant as emulsifier (accounting for 4.90% of the total mass ), of which sodium lauryl sulfate is 55% (w / w), sodium dodecylbenzenesulfonate is 20% (w / w), and sorbitol is 25% (w / w); continue stirring until ten After dialkyl sodium sulfate is completely dissolved, add epoxy polysiloxane (M w =1000), the reaction starts, and the content of primary amino groups in the system does not change after 24 hours of reaction, so stop stirring and heating.

[0039] The infrared spectrogram of epoxy polysiloxane modified gelatin ( figure 2 ) appear...

Embodiment 2

[0042] Described method is consistent with embodiment 1, only difference is that tensio-active agent is replaced by sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate and sorbitol mixed surfactant, wherein sodium dodecyl sulfonate is 55% (w / w), Sodium Dodecyl Benzene Sulfonate 20% (w / w), Sorbitol 25% (w / w).

[0043]The viscosity of the above-mentioned feed liquid is 580 centipoise (50°C), placed at room temperature for 48 hours to form a film, and dried at 60°C for 6 hours to further remove moisture and form a film with toughness. The Tg of the raw gelatin film is 215.7°C, and the Tg of the modified gelatin film is reduced by 15°C; NMR shows that the γ-C signal on the lysine and arginine molecules disappears, and the peak of silicone Si-C forms; XPS shows that the N The chemical shift shifted to 399.87, indicating C–N formation. The dissolution rate of the product in deionized water is 30-80% (the specific effect is affected by the length of the alkyl chain). The stri...

Embodiment 3

[0045] Described method is consistent with embodiment 1, and only difference is that tensio-active agent is changed into sodium lauryl sulfate and sodium dodecylbenzenesulfonate mixed surfactant, wherein sodium lauryl sulfate is 75% (w / w), sodium dodecylbenzenesulfonate is 25% (w / w).

[0046] The viscosity of the above-mentioned feed liquid is 660 centipoise (50°C), placed at room temperature for 48 hours to form a film, and dried at 60°C for 6 hours to further remove moisture and form a film with high strength. The Tg of the raw gelatin film was 215.7°C, and the Tg of the modified gelatin film increased by 15°C; NMR showed that the γ-C signal on the lysine and arginine molecules disappeared, and the peak of silicone Si-C formed; XPS showed that The chemical shift of N shifts to 399.87, indicating C–N formation. The dissolution rate of the product in deionized water is 60%. The dissolution rate of the product in organic solvents ethanol, acetone, and chloroform is 0.5%. Th...

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Abstract

The invention relates to a polysiloxane-modified gelatin leather finishing agent and a preparation method thereof. The preparation method comprises the steps: dissolving gelatin into water to be prepared into aqueous solution, adjusting the pH of the solution to be 6-12 at 40-70 DEG C, and adding a surfactant, wherein the usage amount of the surfactant is 2-20% the mass of the gelatin; continuing stirring, adding Si-O-Si repetitive unit-containing epoxy-polysiloxane continuously or in batches, wherein the usage amount of the epoxy-polysiloxane is 1.5-10 times the mass of the gelatin; and reacting for 12-24h at 40-70 DEG C to obtain water-based and emulsion type epoxy-polysiloxane-modified gelatin leather finishing agent.

Description

Technical field: [0001] The invention relates to a gelatin leather finishing agent, in particular to a water-based, emulsion type epoxy polysiloxane modified gelatin leather finishing agent and a preparation method thereof. This leather finishing agent has the characteristics of self-emulsification, soft film formation, resistance to dry and wet rubbing, and anti-oxidation, and is especially suitable as a finishing agent for garment leather or car leather. Background technique: [0002] The molecular structure of protein finishing agent is similar to that of skin collagen. The two have good compatibility and can produce strong adhesion. They are the earliest leather finishing agents used by people. and silk fibroin four categories. [0003] Gelatin has a wide range of sources and is cheap. It can be used as a finishing agent to maintain the natural luster and feel of the leather. The coating is bright, the surface is firmly bonded, it is resistant to high temperature ironin...

Claims

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Application Information

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IPC IPC(8): C09D189/00C09D7/12C14C11/00C08H1/00
Inventor 许静李天铎夏永梅于文华张向龙
Owner QILU UNIV OF TECH
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