Method for preparing chrome-containing protein filling and retanning agent by using chrome shavings as raw materials

A technology for chrome-tanned leather scraps and a retanning agent is applied in the field of preparing a chrome-containing protein-filled retanning agent, which can solve problems such as discoloration of vinyl-based resins, achieve excellent performance, simple and easy-to-operate extraction process, and solve pollution problems. effect of the problem

Inactive Publication Date: 2011-08-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for preparing a chromium-containing protein-filled retanning agent with high collagen content, si

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Implementation case 1:

[0018] (1) Preparation of tanning waste - chrome tanning shavings hydrolyzate:

[0019] Weigh 35.10g of chrome tan leather scraps (absolute dry weight), add 223.02g of distilled water to a 500mL three-necked flask, stir to heat up, when the temperature of the system reaches 100°C, add 41.88g of formic acid (85%) dropwise, and the addition is completed within 10min , keep the reaction for 2.0h (including the dropwise addition time); after the reaction, stir and cool to room temperature, adjust the pH value of the system to 5.0±0.5 with 40% sodium hydroxide solution; then centrifuge the hydrolyzate (speed=3000r / min, time = 10min), the upper clear night is the required chrome tanning shavings hydrolyzate, which is preserved for future use;

[0020] (2) Preparation of Chromium-containing protein-filled retanning agent for leather:

[0021] Weigh vinyl monomers (acrylic acid, acrylamide, ethyl acrylate = 5:1:1.5, molar ratio) and polymerization inh...

Example Embodiment

[0024] Implementation case 2:

[0025] (1) Preparation of tanning waste - chrome tanning shavings hydrolyzate:

[0026] Weigh 70.20g of chrome tan leather scraps (absolute dry weight), add 446.04g of distilled water into a 1000mL three-necked flask, stir to heat up, when the temperature of the system reaches 95°C, add 83.76g of formic acid (85%) dropwise, and the addition is completed within 10min , keep the reaction for 2.5h (including the dropwise addition time); after the reaction, stir and cool to room temperature, adjust the pH value of the system to 5.0±0.5 with 40% sodium hydroxide solution; then centrifuge the hydrolyzate (speed=3000r / min, time = 10min), the upper clear night is the required chrome tanning shavings hydrolyzate, which is preserved for future use;

[0027] (2) Preparation of Chromium-containing protein-filled retanning agent for leather:

[0028] Weigh vinyl monomers (acrylic acid, acrylamide, ethyl acrylate = 5:1:1.5, molar ratio) and polymerization i...

Example Embodiment

[0031] Implementation case 3:

[0032] (1) Preparation of tanning waste - chrome tanning shavings hydrolyzate:

[0033]Weigh 35.10g of chrome tan leather scraps (absolute dry weight), add 223.02g of distilled water into a 500mL three-necked flask, stir to heat up, when the temperature of the system reaches 90°C, add 41.88g of formic acid (85%) dropwise, and the addition is completed within 10min , keep the reaction for 1.5 h (including the dropwise addition time); after the reaction, stir and cool to room temperature, adjust the pH value of the system to 5.0±0.5 with 40% sodium hydroxide solution; then centrifuge the hydrolyzate (speed=3000r / min, time = 10min), the upper clear night is the required chrome tanning shavings hydrolyzate, which is preserved for future use;

[0034] (2) Preparation of Chromium-containing protein-filled retanning agent for leather:

[0035] Weigh vinyl monomers (acrylic acid, acrylamide, ethyl acrylate = 5:1:1.5, molar ratio) and polymerization in...

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PUM

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Abstract

The invention relates to a method for preparing chrome-containing protein filling and retanning agent by using chrome shavings as raw materials. In the chrome-containing protein filling and retanning agent prepared by the prior art, the collagen content in an active material is low. The chrome-containing protein filling and retanning agent prepared by the prior art cannot overcome the off shade drawback of ethenyl resin tanning agents effectively. The preparation method comprises the steps of preparing leather residue-chrome shaving hydrolysis solution and preparing chrome-containing protein filling and retanning agent for leather. In the invention, a process for hydrolyzing chrome shavings without removing chrome is adopted, so a collagen extraction process is simpler and easy in operation; and the obtained chrome shaving hydrolysis solution has high collagen content, and the prepared chrome-containing protein filling, retanning agent can overcome the off shade drawback caused by single ethenyl resin and improve the selective filling of the ethenyl resin, the existing Cr<3+> ions can improve the tanning effect of the ethenyl resin, and at the same time, a chrome pollution problem is solved.

Description

technical field [0001] The invention belongs to the field of leather production, and in particular relates to a preparation method of using chrome-tanned leather shavings as a raw material to prepare a chromium-containing protein filled retanning agent. Background technique [0002] The leather industry is closely related to human life and national economic development. it is in our national [0003] It occupies an important position in the economy. According to statistics, in recent years, the number of pig, cattle, and sheep leather processed has reached 170 million pieces, and the output accounts for 20% of the world's total, ranking first in the world [Lin Wei, Mu Changdao, Tang Jianhua. Tannery Sludge treatment and resource utilization [J]. Leather Science and Engineering, 2005, 15(4): 57-61.]. According to the statistics of the General Administration of Customs of China, the export of my country's leather and its products has been ranking first in the light industry ...

Claims

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Application Information

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IPC IPC(8): C08F289/00C14C3/02C14C3/08C14C3/22
Inventor 马建中陈柱平高党鸽吕斌武文玲
Owner SHAANXI UNIV OF SCI & TECH
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