Preparation method of retanning agent, retanning agent and application of retanning agent

A technology of retanning agent and sulfonated dialdehyde, applied in the field of retanning agent, can solve problems such as softness, poor firmness, health threats, and quality improvement

Active Publication Date: 2020-10-30
科凯精细化工(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing amino resin retanning agents will release formaldehyde during production or use, posing a threat to health
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Method used

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  • Preparation method of retanning agent, retanning agent and application of retanning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Stir and mix 28.74Kg glutaraldehyde and 20.43Kg pure water at room temperature, adjust the pH value to 8.5, add 11.49Kg sodium sulfamate three times in equal parts, each time at intervals of 3 minutes, stir evenly, and then Raise the temperature to 80°C and react for 1.5 hours to obtain partially sulfonated dialdehyde;

[0038] (2) Mix 4.60Kg melamine and 29.00Kg pure water at room temperature, adjust the pH value to 8.5, then add the part sulfonated dialdehyde prepared in step (1) three times in equal parts, each interval is 10 Minutes, react at a temperature of 80°C for 1.0 hour, heat up to 85°C and continue the reaction for 20 minutes to obtain an amino resin prepolymer containing sulfonic acid groups;

[0039] (3) Add 5.75Kg of ethanol to the amino resin prepolymer containing sulfonic acid groups obtained in step (2), adjust the pH value to 4, then incubate at 60°C for 2 hours, and finally adjust the pH value to neutral to obtain amino Resin retanning agent pro...

Embodiment 2

[0042] (1) Stir and mix 45.62Kg of adipaldehyde and 20.51Kg of pure water at room temperature, adjust the pH value to 9.0, add 11.94Kg of sodium sulfite three times in equal parts, each time at intervals of 3 minutes, stir evenly, and then heat up to 75 Reaction at ℃ for 2.0 hours to obtain partially sulfonated dialdehyde;

[0043] (2) Mix 8.96Kg melamine and 28.00Kg pure water at room temperature, adjust the pH value to 9.0, then add the part sulfonated dialdehyde prepared in step (1) three times in equal parts, each interval is 10 Minutes, react at a temperature of 85°C for 0.5 hours, and continue to react for 10 minutes at a temperature of 90°C to obtain an amino resin prepolymer containing a sulfonic acid group;

[0044] (3) Add 7.46Kg of ethanol to the amino resin prepolymer containing sulfonic acid groups obtained in step (2), adjust the pH value to 5, then incubate at 60°C for 2 hours, and finally adjust the pH value to neutral to obtain amino Resin retanning agent pro...

Embodiment 3

[0047] (1) Stir and mix 22.45Kg glyoxal and 24.00Kg pure water at room temperature, adjust the pH value to 8.5, add 6.12Kg sodium sulfamate and 5.44Kg sodium sulfite three times in equal parts, with an interval of 4 minutes each time, Stir evenly, then heat up to 80°C and react for 1.5 hours to obtain partially sulfonated dialdehyde;

[0048] (2) Mix 8.16Kg melamine and 25.66Kg pure water at room temperature, adjust the pH value to 8.5, then add the part sulfonated dialdehyde prepared in step (1) three times in equal parts, each interval is 15 Minutes, react at a temperature of 85°C for 0.5 hours, heat up to 95°C and continue the reaction for 15 minutes to obtain an amino resin prepolymer containing sulfonic acid groups;

[0049] (3) Add 8.16Kg diethylene glycol to the amino resin prepolymer containing sulfonic acid groups obtained in step (2), adjust the pH value to 4, then incubate at 60°C for 2 hours, and finally adjust the pH value to neutral , to obtain amino resin retan...

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Abstract

The invention discloses a preparation method of a retanning agent. The preparation method comprises the following steps: modifying a dialdehyde monomer to obtain partially sulfonated dialdehyde; thensubjecting the partially sulfonated dialdehyde to a nucleophilic addition reaction with an amino monomer so as to generate an amino resin prepolymer containing a sulfonic acid group; and adding an etherifying agent to seal free aldehyde groups so as to obtain the amino resin retanning agent, wherein a molar ratio of primary amino groups in the amino monomer to the aldehyde groups in a dialdehyde monomer is 1: 1.3 to 1: 3, and the proportion of unreacted aldehyde groups in the partially sulfonated dialdehyde is 40%-90%. The invention further provides the retanning agent and application thereof.According to the preparation method disclosed by the invention, the water solubility and dispersity of the amino resin prepolymer and the retanning agent product are improved, so the retanning agentis good in quality and high in comprehensive performance, and the retanning performance of the retanning agent is comparable with the retanning performance of a traditional amino resin retanning agent.

Description

technical field [0001] The invention belongs to the technical field of retanning agents used for tanning leather and fur, and in particular relates to a retanning agent and a preparation method thereof. Background technique [0002] Leather retanning is an essential process in leather processing. Leather retanning can improve leather softness, grain smoothness, wear resistance, embossing quality, and fullness; , can form different styles of leather, better meet the market demand for leather products. [0003] There are many types of retanning agents, such as aromatic synthetic retanning agents, resin retanning agents, aldehyde retanning agents, oil retanning agents, etc. Among them, aromatic synthetic retanning agents generally contain the following functional groups: phenolic hydroxyl, Sulfonic acid group (-SO 3 H), sulfone group (-SO 2 -), sulfonimide group (-SO 2 NH-), this kind of synthetic retanning agent can make the fullness, softness and filling of leather better...

Claims

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Application Information

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IPC IPC(8): C08G12/42C08G12/32C14C3/22
CPCC08G12/427C08G12/32C14C3/22
Inventor 张达郭连娣贺卫勃沈扬
Owner 科凯精细化工(上海)有限公司
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