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Leather retaining-filling agent prepared by means of phenolsulfonic acid hydrolysis leather-making waste

A filler and waste technology, applied in the field of leather retanning fillers, can solve the problems of high degree of degradation of waste collagen molecules, increase the recycling process, consume dechrome materials, etc., achieve good retanning filling effect, simplify the process, The effect of reducing environmental pollution

Active Publication Date: 2016-05-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the hydrolysis rate of acid hydrolyzed leather collagen is relatively high, the degree of degradation of waste collagen molecules is also high, so that the resulting product has a small molecular weight and is not suitable for use as raw materials for leather retanning fillers, and the hydrolyzed ones contain chromium Leather protein waste from tanning, since chromium and collagen hydrolyzate are mixed together, during the hydrolysis process, chromium-containing waste needs to go through a dechrome step to separate leather collagen from chromium (Zhang Ying et al. Research on Collagen Extraction from Leather Shavings, China Leather, 2008(3): 36-40; Han Jiaojiao et al. The progress of chromium-containing waste dechromation in leather making, Leather Science and Engineering, 2010, 20(1): 32-36. ), which will undoubtedly increase the recycling process, consume dechrome materials, and increase recycling costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Heat 100g of phenol and stir until it melts, then add 120g of 98% concentrated sulfuric acid, continue to heat up to 140°C for sulfonation reaction for 4 hours; cool down the reaction system to 70°C, add 200g of deionized water and stir evenly, then add 100g of water with a water content of 20 %, size ≤ 10 × 2 cm waste chromium-containing leather shavings heat preservation hydrolysis reaction for 4 hours; after adding 20g of urea to dissolve, add 150g of formaldehyde solution with a mass percentage concentration of 30% dropwise in 1 hour, and then heat up to 80°C Condensation reaction for 3 hours; neutralize the pH of the reactants to 3.0 with sodium hydroxide in turn, and then adjust the mass percentage concentration to 40% with deionized water, and then obtain the phenolsulfonic acid-hydrolysis of dark blue-green viscous liquid after cooling Protein condensation complex retanning filler.

[0031] When the retanning filler prepared in this example is used in the retann...

Embodiment 2

[0033] Heat 50g of phenol and 65g of xylenol and stir until melted, then add 115g of 95% concentrated sulfuric acid, continue to heat up to 120°C for sulfonation reaction for 6 hours; cool the reaction system to 70°C, add 100g of deionized water and stir evenly, then Add 50g of waste black leather shavings with a moisture content of 15% and a size of ≤10×2 cm for 5 hours of heat preservation and hydrolysis; add 80g of melamine and stir evenly, then add 100g of formaldehyde solution with a mass percentage concentration of 30% dropwise in 1 hour , and then heated to 80 ° C for 4 hours of condensation reaction; the pH of the reactants was neutralized to 5.0 with potassium hydroxide in turn, and then the mass percentage concentration was adjusted to 40% with deionized water, and a light black viscous liquid was obtained after cooling The phenolsulfonic acid-hydrolyzed protein condensation complex retanning filler.

[0034] When the retanning filler prepared in this example is used...

Embodiment 3

[0036] Heat up 110g of cresol and stir until it melts, then add 110g of 98% concentrated sulfuric acid, continue to heat up to 130°C for sulfonation reaction for 5 hours; cool down the reaction system to 70°C, add 150g of deionized water and stir evenly, then add 200g of water content 30%, the size of the deashed waste ash ≤ 10 × 2 cm, heat preservation and hydrolysis reaction for 3 hours; after adding 50g of dicyandiamide to dissolve, add 150g of formaldehyde solution with a mass percentage concentration of 30% dropwise in 1 hour , and then heated up to 80°C for condensation reaction for 5 hours; the pH of the reactant was neutralized to 6.0 with sodium carbonate in turn, and then its mass percentage concentration was adjusted to 40% with deionized water, and brown yellow viscous liquid was obtained after cooling Phenolsulfonic acid-hydrolyzed protein condensation complex retanning filler.

[0037] The retanning filler prepared in this example is used in the retanning filling...

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Abstract

The invention discloses a leather retaining-filling agent prepared by means of phenolsulfonic acid hydrolysis leather-making waste. According to the retaining-filling agent, a phenolic compound is firstly molten, and then sulfuric acid is added for sulfonation; then cooling is carried out, and after obtained phenolsulfonic acid is diluted with deionized water, leather-making waste is added for a hydrolysis reaction; and then a phenolic solution is added dropwise for a condensation reaction, and after the reactant is sequentially subjected to neutralization with alkali, concentration adjustment with deionized water and cooling, the phenolsulfonic acid-protein hydrolysate condensation composite retaining-filling agent is obtained. The obtained leather retaining-filling agent has the property of an aromatic synthetic tanning agent, has the performance of protein filler, is a novel composite performance leather retaining-filling agent and has a good retaining-filling effect on cowhide and sheepskin. The preparing process is simple, cost is low, the resource of chromium is fully utilized, environment pollution caused by emission is reduced, and double benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of preparing leather retanning filler by hydrolyzing tanning waste with acid, and in particular relates to a leather retanning filler prepared by hydrolyzing tanning waste with phenolsulfonic acid. Background technique [0002] Tanning is a process in which raw animal hides are processed into leather through physical, chemical, biological, mechanical and other processing. In the process of trimming, flaking, smoothing, and grinding of leather in tanning, a large amount of solid waste of leather protein will be produced. According to statistics, among the solid wastes produced by the tanning industry, leather shavings and scraps account for about 40-50% of the raw leather (Erdem M. Chromium recovery from chromeshaving generated in tanning process. Journal of Hazardous Materials, 2006, 129 (1): 143-146). [0003] Skin protein solid waste mainly includes the following types: [0004] (1) Chromium-free skin pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/08
CPCC14C3/08
Inventor 程海明张俊卿李巧钰周华龙陈敏
Owner SICHUAN UNIV
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