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A method for preparing protein plastics from chromium-containing waste leather scraps

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: 2021-07-23
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 34.0 g of blue skin powder, 2.0 g of oxalic acid, and 4.0 g of formamide in a beaker, and stir them evenly with a glass to make the three evenly mixed. After drying in a blast drying oven 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 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, afte...

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 26.0 g of blue bark powder, 2.0 g of oxalic acid, and 12.0 g of formamide respectively and place them in a beaker, stir them evenly with a glass, so that the three are evenly mixed. After drying in a blast drying oven 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 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,...

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 34.0 g of blue bark powder, 2.0 g of oxalic acid, and 4.0 g of acetyl ammonium in a beaker, stir them evenly with a glass, and mix them evenly. After drying in a blast drying oven 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 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, after it is ...

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PUM

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Abstract

The invention provides a method for preparing protein plastics by utilizing chromium-containing waste leather scraps. Its preparation method is to firstly crush the chromium-containing waste leather shavings produced in the trimming, smoothing and leather grinding sections of the tannery to obtain the blue leather powder raw material; then use the masking agent in the tanning production and the The plasticizer respectively modifies and plasticizes the blue skin powder to obtain the modified blue skin powder which can be directly extruded; and then extrudes under suitable process conditions to obtain the protein plastic. Oxalic acid, citric acid, and malonic acid were used to modify the blue skin powder to destroy the complexation of Cr(Ⅲ) and collagen carboxyl groups. Amide plasticizers are used to plasticize the blue skin powder to reduce the melting temperature of the blue skin powder, so that it can be directly processed by conventional processing and molding methods for thermoplastic processing. The invention uses chromium-containing waste leather scraps as raw materials to prepare biodegradable plastics with good mechanical properties, which can be used as packaging plastics and have 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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Patent Type & Authority Patents(China)
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