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A zwitterionic non-metallic tanning agent

A zwitterionic, non-metallic technology, applied in the field of zwitterionic non-metallic tanning agents and their preparation, can solve the problems of chrome tanning pollution, excessive formaldehyde, low tanning shrinkage temperature, etc. good effect

Active Publication Date: 2021-06-22
WENZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vegetable tanning agent has tight tanning and good formability, but poor extensibility and low tanning shrinkage temperature, so it is not suitable to be used as the main tanning agent for light leather
However, aldehyde tanning agents and organic phosphine tanning agents have the problem of excessive formaldehyde
In addition, compared with chrome tanning agents, the isoelectric point of leather tanned by non-metallic tanning agents is lower. For example, the isoelectric point of glutaraldehyde tanned leather is between 5.1 and 5.2, and the isoelectric point of vegetable tanned leather is about 4.0, which are significantly lower than The isoelectric point of chrome tanned leather (7.7~7.9), so the surface of aldehyde tanned leather and vegetable tanned leather is negatively charged or weakly positively charged, and the binding ability to anionic materials such as retanning agents, fatliquor and dyes in leather making is weak
Usually aldehyde tanned leather and organic chlorine tanned leather still need to use a certain amount of chrome tanning agent for retanning to improve its absorption of anionic materials such as retanning agents, fatliquor and dyes. Therefore, it is still difficult for non-metallic tanning agents to Substantially solve the pollution problem in chrome tanning

Method used

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  • A zwitterionic non-metallic tanning agent
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  • A zwitterionic non-metallic tanning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of zwitterionic non-metallic tanning agent, specifically comprising the following steps:

[0032] (1) Add 37.2g of deionized water, 0.1mol of ethylenediamine and 0.2mol of chloroacetic acid into the reactor, heat up to 75°C, adjust the pH to 10-12 with a 20% aqueous solution of sodium hydroxide, and keep the temperature for 4 hours .

[0033] (2) The reactant of step (1) is cooled to room temperature, 37.2g of acetone is added, cooled in an ice-water bath, the temperature control reaction solution is 0~5°C, then 18.4g of cyanuric chloride is added, and the mass concentration is 20% Sodium carbonate solution adjusts the pH of the reaction solution between 6.0 and 7.0, and reacts for 3 to 6 hours.

[0034] (3) The reaction solution in step (2) is kept at 10-20° C., and the solvent acetone is distilled off under reduced pressure to obtain the zwitterionic non-metallic tanning agent.

Embodiment 2

[0036] A preparation method of zwitterionic non-metallic tanning agent, specifically comprising the following steps:

[0037] (1) Add 57.75g of deionized water, 0.1mol of diethylenetriamine and 0.3mol of chloroacetic acid into the reactor, heat up to 75°C, adjust the pH to 10-12 with a 20% aqueous solution of sodium hydroxide, and keep the temperature for reaction 4h.

[0038] (2) Cool the reactant of step (1) to room temperature, add 57.75g of acetone, cool in an ice-water bath, and control the temperature of the reaction solution at 0-5°C, then add 36.8g of cyanuric chloride, and use cyanuric chloride with a mass concentration of 20%. Sodium carbonate solution adjusts the pH of the reaction solution between 6.0 and 7.0, and reacts for 3 to 6 hours.

[0039] (3) The reaction solution in step (2) is kept at 10-20° C., and the solvent acetone is distilled off under reduced pressure to obtain the zwitterionic non-metallic tanning agent.

Embodiment 3

[0041] A preparation method of zwitterionic non-metallic tanning agent, specifically comprising the following steps:

[0042] (1) Add 78.3g of deionized water, 0.1mol of triethylenetetramine and 0.4mol of chloroacetic acid into the reactor, heat up to 75°C, adjust the pH to 10-12 with a 20% aqueous solution of sodium hydroxide, and keep the temperature for reaction 4h.

[0043] (2) Cool the reactant of step (1) to room temperature, add 78.3g of acetone, cool in an ice-water bath, control the temperature of the reaction solution at 0-5°C, then add 36.8g of cyanuric chloride, and use 20% cyanuric chloride Sodium carbonate solution adjusts the pH of the reaction solution between 6.0 and 7.0, and reacts for 3 to 6 hours.

[0044] (3) The reaction solution in step (2) is kept at 10-20° C., and the solvent acetone is distilled off under reduced pressure to obtain the zwitterionic non-metallic tanning agent.

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Abstract

The invention discloses a zwitterionic non-metallic tanning agent. First, a certain amount of polyamine compounds and chloroacetic acid are added to a reactor, and an alkaline substance is used to adjust the pH of the reaction solution between 10-12, and the reaction is carried out at 70-80° C. 3-4 hours, then cool down to room temperature, add a certain amount of acetone, cool and control the temperature at 0-5°C, add a certain amount of cyanuric chloride, and adjust the pH to 6.0-7.0 with an alkaline solution, and react for 3-4 hours . Distill acetone under reduced pressure at 10-20°C to obtain zwitterionic non-metallic tanning agent. The zwitterionic non-metallic tanning agent prepared by the invention has amphoteric characteristics, good tanning property, white and fine leather surface, and good compatibility with anionic materials.

Description

technical field [0001] The invention relates to the technical field of synthesis of leather chemicals, in particular to a zwitterionic non-metallic tanning agent and a preparation method thereof. Background technique [0002] Tanning agent is the key process for leather to leather in the tanning process, and the tanning method has a decisive impact on the performance and quality of leather products. Among the various tanning agents known in the art (i.e. mineral tanning agents, vegetable tanning agents, aldehyde tanning agents and synthetic tanning agents, etc.), chrome tanning agents are the most widely used, suitable for the production of different types of leather products, and can Provide satisfactory product performance (such as high shrinkage temperature, good leather sensory properties and physical and mechanical properties, and good compatibility with leather special chemicals such as retanning agents, fatliquor, dyes, etc.). [0003] However, with the improvement o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08C14C3/26
CPCC14C3/08C14C3/26
Inventor 邹祥龙任便利沈晓军柴玉叶
Owner WENZHOU UNIV