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A leather retanning filler prepared by hydrolyzing tanning waste with phenolsulfonic acid

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 in recycling costs, and small molecular weight of products, so as to achieve good retanning filling effect, save costs, and operate simple effect

Active Publication Date: 2017-12-26
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] After 100g of phenol was heated and stirred until it melted, 120g of 98% concentrated sulfuric acid was added, and the temperature was increased to 140°C for sulfonation reaction for 4 hours; the temperature of the reaction system was lowered to 70°C, 200g of deionized water was added and stirred evenly, and then 100g of moisture content was added 20% of waste chromium-containing leather shavings with a size of ≤10×2 cm are insulated and hydrolyzed for 4 hours; after 20g of urea is added to dissolve, 150g of formaldehyde solution with a mass percentage concentration of 30% is added dropwise in 1 hour, and then the temperature is raised to 80 Condensation reaction at ℃ for 3 hours; successively neutralize the pH of the reactants to 3.0 with sodium hydroxide, and then adjust the mass percentage concentration to 40% with deionized water. After cooling, a dark blue-green viscous liquid phenol sulfonic acid- Hydrolyzed protein condensation compound retanning filler.

[0031] Th...

Embodiment 2

[0033] After heating and stirring 50g of phenol and 65g of xylenol until it melts, add 115g of 95% concentrated sulfuric acid and continue heating 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 heat preservation and hydrolysis for 5 hours; add 80g of melamine and stir evenly, and then drop 100g of formaldehyde with a mass percentage of 30% in 1 hour. The solution is heated to 80℃ for condensation reaction for 4 hours; the pH of the reactants is neutralized to 5.0 with potassium hydroxide, and then the mass percentage concentration is adjusted to 40% with deionized water. After cooling, a light black viscous is obtained Liquid phenolsulfonic acid-hydrolyzed protein condensation compound retanning filler.

[0034] When the retanning filler prepared in this embodiment is used in the retanning and filling...

Embodiment 3

[0036] After 110g of cresol was heated and stirred until it melted, 110g of 98% concentrated sulfuric acid was added, and the temperature was increased to 130°C for sulfonation reaction for 5 hours; the temperature of the reaction system was lowered to 70°C, 150g of deionized water was added and stirred evenly, and then 200g of water was added The content of 30%, the size of ≤10×2 cm of waste gray skin after deashing is kept and hydrolyzed for 3 hours; 50g of dicyandiamide is added to dissolve, and 150g of formaldehyde with a mass percentage concentration of 30% is added in 1 hour The solution is heated to 80℃ for condensation reaction for 5 hours; the pH of the reactants is neutralized to 6.0 with sodium carbonate in turn, and the mass percentage concentration is adjusted to 40% with deionized water. After cooling, a brown-yellow viscous liquid is obtained The phenol sulfonic acid-hydrolyzed protein condensation compound retanning filler.

[0037] The retanning filler prepared i...

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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 fillers by hydrolyzing tanning wastes with acid, and specifically relates to a leather retanning filler prepared by hydrolyzing tanning wastes with phenolsulfonic acid. Background technique [0002] Tanning is a process in which animal raw material hides are processed and processed into leather through physical, chemical, biological, and mechanical processing. In the process of trimming, slicing, smoothing, and grinding leather, a large amount of solid waste of skin protein will be produced. According to statistics, leather shavings and trim wastes in the solid waste generated by the tanning industry account for about 40-50% of the raw leather (ErdemM.Chromium recovery from chrome shaving 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 leather protein...

Claims

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Application Information

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Patent Type & Authority Patents(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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