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Method for preparing protein plastic by using chromium-containing waste leather shavings

A technology of leather shavings and chromium waste, which is applied in the field of protein plastics, can solve problems affecting the development of tannery enterprises, and achieve the effects of continuous production, high efficiency and good compatibility

Active Publication Date: 2019-02-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2008, the Ministry of Environmental Protection included chromium-containing waste in the "National List of Hazardous Wastes". However, due to the lack of domestic enterprises qualified to deal with hazardous waste, a large number of chromium-containing waste leather scraps were piled up in tannery enterprises, which seriously affected tannery enterprises. development of
So far, there have been no literature and patent reports on the direct use of blue skin powder to prepare general-purpose plastics by thermal processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Collect chromium-containing waste leather scraps from tanneries, wash and remove dust with distilled water, and dry them in a blast drying oven at 40°C for 48 hours. After drying, they are further pulverized and screened through a 1000-mesh sieve plate to obtain blue leather powder. Store dry. Weigh 34.0g of blue skin powder, 2.0g of oxalic acid, and 4.0g of formamide in a beaker, and stir them evenly with a glass to make the three evenly mixed. Put it in a blast drying oven and dry it at 40°C for 48 hours, put it into a torque rheometer for mixing, and mix it at 140°C for 7 minutes to make the masking agent and chromium-containing skin powder fully act, and then mix It is shredded to obtain modified skin powder. The modified skin powder is extruded in a twin-screw extruder, and the extrusion temperature is set at 120°C, the screw speed is 60 rpm, and a suitable mold interface is selected, and the modified and plasticized skin powder is Adding, turning time: 7 minutes...

Embodiment 2

[0024] Collect chromium-containing waste leather scraps from tanneries, wash and remove dust with distilled water, and dry them in a blast drying oven at 40°C for 48 hours. After drying, they are further pulverized and screened through a 1000-mesh sieve plate to obtain blue leather powder. Store dry. Weigh 26.0g of blue bark powder, 2.0g of oxalic acid, and 12.0g of formamide in a beaker, and stir them evenly with a glass to make the three evenly mixed. Put it in a blast drying oven and dry it at 40°C for 48 hours, put it into a torque rheometer for mixing, and mix it at 140°C for 7 minutes to make the masking agent and chromium-containing skin powder fully act, and then mix It is shredded to obtain modified skin powder. The modified skin powder is extruded in a twin-screw extruder, and the extrusion temperature is set at 120°C, the screw speed is 60 rpm, and a suitable mold interface is selected, and the modified and plasticized skin powder is Adding, turning time: 7 minute...

Embodiment 3

[0026] Collect chromium-containing waste leather scraps from tanneries, wash and remove dust with distilled water, and dry them in a blast drying oven at 40°C for 48 hours. After drying, they are further pulverized and screened through a 1000-mesh sieve plate to obtain blue leather powder. Store dry. Weigh 34.0g of blue bark powder, 2.0g of oxalic acid, and 4.0g of acetyl ammonium, respectively, and place them in a beaker, and stir them evenly with a glass, so that the three are evenly mixed. Put it in a blast drying oven and dry it at 40°C for 48 hours, put it into a torque rheometer for mixing, and mix it at 140°C for 7 minutes to make the masking agent and chromium-containing skin powder fully act, and then mix It is shredded to obtain modified skin powder. The modified skin powder is extruded in a twin-screw extruder, and the extrusion temperature is set at 120°C, the screw speed is 60 rpm, and a suitable mold interface is selected, and the modified and plasticized skin p...

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PUM

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Abstract

The invention provides a method for preparing protein plastic by using chromium-containing waste leather shavings. The preparation method comprises the following steps: pulverizing the chromium-containing waste leather shavings generated from the trimming, shaving and grinding sections of a tannery to obtain a wet-blue powder raw material; and then using a smear agent in the leather production anda plasticizer in the high-molecular processing for respectively modifying and plasticising the wet-blue powder to obtain the modified blue wet-blue powder which can be directly extruded; and performing extrusion molding under appropriate process conditions to obtain a protein plastic. The wet-blue powder is modified with oxalic acid, citric acid and malonic acid to destroy the complexation of Cr(III) and a collagen carboxyl group. The amide-type plasticizer is used to plasticize the wet-blue powder to reduce the melting temperature of the wet-blue powder, so that a conventional processing moulding method can be directly used for thermoplastic processing. The method utilizes the chromium-containing waste leather shavings as a raw material to prepare plastics with biodegradability and goodmechanical properties, the plastic can be used as the packaging plastic, and has good prospects.

Description

technical field [0001] The invention relates to the field of resource material preparation, in particular to a biodegradable protein plastic based on chromium-containing waste leather scraps with good mechanical properties. Background technique [0002] The leather industry is a traditional industry with comprehensive advantages in my country, and its export earnings have always ranked first in the light industry. In tanning production, a large amount of chrome-containing leather waste will inevitably be produced in the mechanical processing processes such as trimming, smoothing, softening and grinding after tanning. If one ton of cowhide salt wet hide is put into production, a total of about 249kg of chrome-containing leather waste will be produced. The wet weight accounts for about 50% of the solid waste of protein tanning, but the dry weight (ie, collagen content) accounts for about 70%. above. According to statistics, my country's tanning industry produces about 2-2.5 ...

Claims

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Application Information

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IPC IPC(8): C08L89/06C08K5/092C08K5/20
CPCC08K5/092C08K5/20C08L2207/20C08L89/06
Inventor 林炜唐海林梁玉可吴晓波刘婷
Owner SICHUAN UNIV