Salt-free pickling-free amphoteric polymer chrome-free tanning agent

A technology of amphoteric polymer and chrome-free tanning agent, which is applied in animal husbandry, small raw hide/large raw hide/leather skin/fur chemical treatment, application, etc. It can solve the problems of increased organic pollution content, low absorption and utilization rate, and the quality of finished leather. gaps and other issues, to achieve the effects of promoting absorption, low production costs, and simple production methods

Active Publication Date: 2013-06-12
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the molecules of these tanning agents are small and have a single group, and the tanned crust leather has a strong negative charge, and the absorption and utilization rate of anionic chemical materials (such as conventional organic retanning agents, dyes, and fatliquor) used in subsequent processes low, not only cause serious waste of these materials, but also lead to increased organic pollution content in wastewater, and the quality of final leather has a certain gap compared with chrome tanned leather

Method used

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  • Salt-free pickling-free amphoteric polymer chrome-free tanning agent
  • Salt-free pickling-free amphoteric polymer chrome-free tanning agent
  • Salt-free pickling-free amphoteric polymer chrome-free tanning agent

Examples

Experimental program
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Effect test

Embodiment 1

[0032] First add 60Kg of ethanolamine and 100Kg of formaldehyde into the reaction kettle, then add concentrated sulfuric acid to adjust the pH of the reaction system to 6.0-6.5, add 110Kg of acetaldehyde solution (40%), and react at 35-40°C for 5 hours to obtain Mannich base intermediate. Add 300Kg of water, 70Kg of itaconic acid, 165Kg of dimethyl diallyl ammonium chloride, 2Kg of mercaptoethanol to the intermediate, and add persulfuric acid diluted with 100Kg of water to the reaction kettle dropwise after the temperature rises to 75-80°C. The ammonium initiator is 10Kg, and the dropping time is 2 hours. After the dropping, it is kept at 75-80°C for 0.5 hour, and the temperature is lowered to below 50°C, and the material is discharged to obtain the product.

Embodiment 2

[0034] First add 70Kg of diethylamine and 80Kg of formaldehyde into the reaction kettle, then add concentrated sulfuric acid to adjust the pH of the reaction system to 6.5-7.0, add 80Kg of propionaldehyde, and react at 50-55°C for 4 hours to obtain the Mannich base intermediate. Add 350Kg of water, 80Kg of acrylic acid, 145Kg of diethyldiallyl ammonium chloride, 4Kg of n-dodecyl mercaptan to the intermediate, and after the temperature rises to 80-85°C, add dropwise to the reaction kettle diluted with 90Kg of water The sodium persulfate initiator is 9Kg, and the dropping time is 1 hour. After the dropping, it is kept at 80-85°C for 1 hour, and the temperature is lowered to below 50°C, and the material is discharged to obtain the product.

Embodiment 3

[0036] First add 75Kg of monomethylethanolamine and 80Kg of formaldehyde into the reaction kettle, then add concentrated sulfuric acid to adjust the pH of the reaction system to 6.5-7.0, add 60Kg of propionaldehyde, and react at 40-45°C for 3.5 hours to obtain the Mannich base intermediate . Add 400Kg of water, 90Kg of acrylic acid, 125Kg of dimethyl diallyl ammonium chloride, 6Kg of n-dodecyl mercaptan to the intermediate, and after heating up to 85-90°C, add dropwise to the reaction kettle diluted with 80Kg of water Potassium persulfate initiator 8Kg, dropwise time is 1.5 hours, after dropwise addition, keep warm at 80-85°C for 1.5 hours, cool down to below 50°C and discharge to obtain the product.

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Abstract

The invention discloses a salt-free pickling-free amphoteric polymer chrome-free tanning agent which is characterized in that according to the salt-free pickling-free amphoteric polymer chrome-free tanning agent, firstly, organic amine and fatty aldehyde with active alpha-H undergo Mannich reaction, a Mannich base midbody with a formyl group is obtained, and then, after an allyl monomer with the formyl group is generated in the original position of the midbody, the midbody, the allyl monomer with a cation and allyl acid undergo free radical polymerization, and the salt-free pickling-free amphoteric polymer chrome-free agent is obtained. The salt-free pickling-free amphoteric polymer chrome-free tanning agent is a polymer tanning agent containing the formyl group and has certain filling capacity, tanning properties of the salt-free pickling-free amphoteric polymer chrome-free tanning agent are rival with the properties of an existing aldehydes tanning agent, molecular weight is large, when the salt-free pickling-free amphoteric polymer chrome-free tanning agent is in use, a leather blank is free of pickling, salt pollution in the follow-up processes can be eliminated, carboxyl and amino contained by the agent can further prompt absorption to follow-up finishing materials by the leather blank, and the whole quality of a leather is improved. According to preparation of the salt-free pickling-free amphoteric polymer chrome-free tanning agent, air pollution due to raw materials is avoided, chrome and NaCl pollution of a traditional tanning agent is avoided, processes are reduced, silicate consumption is reduced, and cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of chrome-free tanning agents for tanning leather and fur, and in particular relates to a chrome-free tanning agent for amphoteric polymers without salt and pickling. Background technique [0002] Chrome tanning is the dominant tanning method in the tanning industry, but the chrome tanning process is one of the most polluting processes in the tanning process. The 140 million tons of waste water produced by my country's leather industry every year contains 1,300 tons of total chromium, which makes it very difficult to meet the standards for sewage treatment. In addition, the conventional chrome tanning waste liquid also contains 30000-40000mg / L NaCl brought in by the pickling process, which is the main reason for the excessive chloride ion content in the comprehensive wastewater. Today, as environmental protection is increasingly emphasized and valued, chrome tanning, as the main tanning method, is already f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/22C08F216/34C08F226/02C08F222/02C08F220/06
Inventor 石碧李靖廖学品张净曹明蓉
Owner SICHUAN UNIV
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