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Method for preparing foamed plastic from waste leather leftover materials

A technology of foam plastics and leftover materials, which is applied in the field of resource material preparation, to achieve the effects of cross-linking stability, cross-linking degree, resource utilization, and easy operation

Active Publication Date: 2020-10-13
四川创智炜业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there are no literature and patent reports on the direct use of collagen as a matrix to prepare general-purpose foamed plastics through conventional thermal processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The leather scraps of the tannery were cleaned and dusted with deionized water. After collagen was extracted, it was dried in a blast drying oven at 40 °C for 48 h. After drying, it was further pulverized by a pulverizer to obtain collagen particles, which were dried and stored. Weigh 17.0 g of collagen, 1.2 g of glycerol, 0.4 g of dialdehyde starch, 0.4 g of baking soda, and 1.0 g of calcium carbonate into a beaker filled with an appropriate amount of water. The dry mixture was obtained after drying in an air drying oven at 45 °C for 64 h to remove water. Take an appropriate amount of dry mixture and place it in a foaming mold, and perform hot-press foaming under a flat vulcanizer, and set the foaming temperature: 130 °C, foaming time: 10 min, pressure: 0.5MPa, and after it is fully melted, Foamed plastic can be obtained.

Embodiment 2

[0026] The leather scraps of the tannery were cleaned and dusted with deionized water. After collagen was extracted, it was dried in a blast drying oven at 40 °C for 48 h. After drying, it was further pulverized by a pulverizer to obtain collagen particles, which were dried and stored. Weigh 16.0 g of collagen, 2.2 g of glycerol, 0.4 g of dialdehyde starch, 0.4 g of baking soda, and 1.0 g of calcium carbonate into a beaker filled with an appropriate amount of water. The dry mixture was obtained after drying in an air drying oven at 45 °C for 64 h to remove water. Take an appropriate amount of dry mixture and place it in a foaming mold, and perform hot-press foaming under a flat vulcanizer, and set the foaming temperature: 130 °C, foaming time: 10 min, pressure: 0.5MPa, and after it is fully melted, Foamed plastic can be obtained.

Embodiment 3

[0028] The leather scraps of the tannery were cleaned and dusted with deionized water. After collagen was extracted, it was dried in a blast drying oven at 40 °C for 48 h. After drying, it was further pulverized by a pulverizer to obtain collagen particles, which were dried and stored. Weigh 17.0 g of collagen, 1.2 g of glycerol, 0.4 g of dialdehyde starch, 0.4 g of baking soda, and 1.0 g of calcium carbonate into a beaker filled with an appropriate amount of water. The dry mixture was obtained after drying in an air drying oven at 45 °C for 64 h to remove water. Take an appropriate amount of dry mixture and place it in a foaming mold, and perform hot-press foaming under a flat vulcanizer, and set the foaming temperature: 160 °C, foaming time: 7 min, pressure: 0.5MPa, and after it is fully melted, Foamed plastic can be obtained.

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PUM

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Abstract

The invention provides a method for preparing foamed plastic from waste leather leftover materials. The preparation method comprises the following steps: firstly, extracting collagen from leather leftover materials generated by a tannery; uniformly mixing collagen, a cross-linking agent, a foaming agent, a nucleating agent and a plasticizer in water according to a certain ratio, and drying the mixture to remove water; and finally, carrying out hot press molding under proper process conditions to obtain the protein foamed plastic. Dialdehyde macromolecules such as dialdehyde starch, dialdehydecellulose and dialdehyde pram are selected as cross-linking agents to carry out cross-linking modification on collagen, so that the strength of the collagen is improved. Small molecule reagents such as glycerol and urea are selected as plasticizers to plasticize and modify collagen, so that the melting temperature of the collagen is reduced, and the collagen can be directly subjected to hot-pressing processing by using a conventional processing and forming method. The biodegradable foamed plastic with good mechanical properties is prepared from leather leftover materials, can be used as thermal insulation foamed plastic and has a good application prospect.

Description

technical field [0001] The invention relates to the field of preparation of resource-based materials, in particular to a biodegradable foamed plastic with good mechanical properties. Background technique [0002] Foamed plastic is a very important synthetic polymer material and an important part of the current plastics industry. Due to the characteristics of light weight, heat insulation, sound absorption and shock absorption, foam plastics are widely used in packaging, thermal insulation, sound insulation and other fields. At present, most of the foamed plastic products are made from petrochemical cracking products. These products also produce a lot of white pollution due to the disadvantage of being difficult to degrade. Therefore, the search for degradable materials to process foamed plastics has also become a research hotspot. The leather industry produces a large amount of leather waste every year, which is one of the important pollutions of the leather industry. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L89/00C08L3/10C08K3/26C08K5/053C08J9/08
CPCC08J9/0023C08J9/0061C08J9/0066C08J9/0095C08J9/08C08J2203/02C08J2389/00C08J2403/10C08K5/053C08K2003/265
Inventor 林炜唐海林王春华吴尖辉
Owner 四川创智炜业科技有限公司