Preparation method of leather scrap composite modified EVA foamed shoe material

A composite modification and leather technology, applied in footwear, application, clothing and other directions, can solve the problems of non-hygroscopic and non-degradable EVA foam materials, and achieve the effects of low cost, alleviation of processing pressure, and uniform and dense product voids.

Active Publication Date: 2019-12-24
CHINA LEATHER & FOOTWEAR IND RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a foamed shoe material made of composite modified EVA with leather shavings, to solve the problem of non-hygroscopic tre

Method used

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  • Preparation method of leather scrap composite modified EVA foamed shoe material
  • Preparation method of leather scrap composite modified EVA foamed shoe material
  • Preparation method of leather scrap composite modified EVA foamed shoe material

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preparation example Construction

[0033] A kind of preparation method of leather shavings composite modified EVA foaming shoe material of the present invention, comprises the following steps:

[0034] Step 1), pulverize the leather solid waste collected from tannery enterprises. First, dry and pulverize the leather solid waste to obtain leather shavings (the finer the pulverization, the more conducive to the banburying operation, the particle size is required to be less than 0.5mm), and then dehydrate the leather shavings. The dehydration treatment method is: weigh A certain amount of leather shavings was dried at 105°C to constant weight, and then dried at 160°C for 2 hours, and the waste leather shavings were packed in an airtight bag and sealed for the next step. In this step, the free moisture is dried at 105°C, and the moisture must be completely removed, otherwise the final product will produce air bubbles due to the presence of moisture, which will affect the product quality. Drying at 160°C is to get ...

Embodiment 1

[0058] Step 1), dry and pulverize the non-chrome tanned leather solid waste to obtain leather scraps, and then dehydrate the leather scraps: weigh 1000g of leather scraps and dry them at 105°C to constant weight to obtain about 850g of dried leather Dry matter; continue to dry at 160°C for 2 hours to obtain about 810g of dry leather scraps, pack the leather scraps in airtight bags and seal them (to prevent moisture absorption) for the next step.

[0059] Step 2), accurately weigh 800g of leather shavings in step 1) and add it to a high-speed mixer, then add 456g of glycerin, stop stirring for 5 minutes, continue stirring for 5 minutes after 10 minutes, then stop for 10 minutes, continue stirring for 5 minutes, take it out and seal it (to prevent moisture absorption) for the next step.

[0060] Step 3): Accurately weigh 78g of plasticized leather shavings, 200g of EVA and 7g of stearic acid in step 2), add them to the internal mixer, and banbury at 120°C for 4 minutes.

[0061...

Embodiment 2

[0069] Step 1), dry and pulverize the chrome-tanned leather solid waste to obtain leather scraps, and then dehydrate the leather scraps: weigh 1000g of leather scraps and dry them at 105°C to constant weight to obtain about 845g of dried Continue to dry at 160°C for 2 hours to obtain about 805g of dry leather scraps, pack the leather scraps in airtight bags and seal them (to prevent moisture absorption) for the next step.

[0070] Step 2), accurately weigh 800g of waste leather scraps in step 1) and add it to a high-speed mixer, then add 456g of glycerin, stop stirring for 5 minutes, continue stirring for 5 minutes after 10 minutes, then stop for 10 minutes, continue stirring for 5 minutes, take out the seal (to prevent moisture absorption ) for the next step.

[0071] Step 3): Accurately weigh 68g of plasticized leather shavings, 200g of EVA and 7g of stearic acid in step 2) and add them into the internal mixer, and banbury at 120°C for 4 minutes.

[0072] Step 4) Accurately...

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Abstract

The invention relates to a preparation method of a leather scrap composite modified EVA foamed shoe material, which is characterized in that leather scraps obtained by crushing waste leather and wastefur generated in the leather and fur processing process and EVA are subjected to composite modification to produce the shoe material. In the production process, a plasticizer, a demolding auxiliary agent, a foaming agent and a foaming auxiliary agent are added; and the filler and the cross-linking agent are added. The materials are added in batches in an internal mixer, and vulcanization and foaming are completed on a press vulcanizer after uniform mixing. The method is simple; wherein leather wastes (leather scraps) are partially used for producing shoe materials; physical indexes of the EVAshoe material can be completely comparable with those of common EVA shoe materials; the material is low in cost and price, the water absorption performance of the material can be controlled accordingto needs, the material can replace a traditional shoe material EVA to be applied to a shoe insole, sanitation in a shoe cavity can be improved, the shoe material can be naturally degraded, in a soilburying method test, a sample is buried in soil with humus, and the degradation weight loss rate in 60 days can reach about 7.5% at most.

Description

technical field [0001] The invention relates to a preparation method of composite modified EVA foamed shoe material of leather shavings, belonging to the field of new materials. Background technique [0002] my country is a big country in tanning. It produces about 110 million pieces of leather equivalent to cowhide (standard sheet) every year, and each piece of cowhide is calculated at 25kg, which is about 2.75 million tons. Processing 1 ton of raw leather produces about 120kg of meat residue, 57kg of hair, 133kg of split waste, 57kg of shaved waste, 88kg of scraps from trimming, and 3kg of grinding dust, which together account for about 40% of the raw hide. , about 1.1 million tons of leather waste need to be processed every year. Leather waste contains a lot of protein and oil, and its structure contains amino, carboxyl and ester groups. It not only has good hygroscopicity, but also can produce cross-linking reaction with the ester groups in EVA under certain conditions,...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L89/00C08K13/02C08K5/053C08K3/26C08K3/34C08K5/14C08J9/10B29B7/74B29C35/02A43B1/14
CPCC08J9/0061C08J9/0023C08J9/0066C08J9/0095C08J9/103B29C35/02B29B7/7461A43B1/0009A43B1/14C08J2323/08C08J2489/00C08J2203/04
Inventor 刘显奎李鹏宇庞晓燕程正平尹岳涛段徐宾张玄辉李朝辉
Owner CHINA LEATHER & FOOTWEAR IND RES INST
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