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

A technology of amino resin and retanning agent, applied in application, animal husbandry, small raw hide/large raw hide/leather skin/fur chemical treatment, etc., to achieve good product quality, good product quality and simple reaction products

Active Publication Date: 2020-11-20
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

At present, domestic tanners' research mostly focuses on how to reduce free formaldehyde in products, while there is less research on formaldehyde-free amino resins

Method used

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

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preparation example Construction

[0029] The invention provides a preparation method of amino resin retanning agent, which uses amino-terminated polyoxyethylene ether to modify dialdehyde monomers, and finally etherifies and blocks free aldehyde groups. Compared with the existing preparation method, avoiding the use of sulfonating reagents in the preparation process, such as sodium bisulfite and other sodium salts, and using amino-terminated polyoxyethylene ether to modify the dialdehyde monomer, so that retanning The agent product has good water solubility and stability, so that it does not appear crystallization caused by sodium salt during storage and use.

[0030] Herein, a range indicated by "one value to another value" is a general representation which avoids enumerating all values ​​in the range in the specification. Therefore, the description of a specific numerical range covers any numerical value in the numerical range and the smaller numerical range bounded by any numerical value in the numerical ra...

Embodiment 1

[0039] (1) Stir and mix 25.81Kg glyoxal and 20Kg pure water at room temperature, adjust the pH value to 8.5, add 6.45Kg polyetheramine D-230, stir evenly, then raise the temperature to 85°C, and continue the reaction for 1.5 hours to obtain Dialdehyde modified products;

[0040] (2) First mix 7.10Kg melamine and 27.74Kg pure water at room temperature, adjust the pH value to 8.5, then add the dialdehyde modified product prepared in step (1) in three equal parts, each interval 10 minutes, react at a temperature of 80°C for 1.0 hour, then raise the temperature to 90°C, and continue the reaction for 20 minutes to obtain a non-ionic amino resin prepolymer;

[0041](3) Add 12.90Kg of ethanol to the nonionic amino resin prepolymer obtained in step (2), adjust the pH value to 5, then react at 60°C for 2 hours, finally adjust the pH value to neutrality, and the product is this The amino resin retanning agent product of embodiment.

Embodiment 2

[0043] (1) Stir and mix 42.28Kg glutaraldehyde and 20.06Kg pure water at room temperature, adjust the pH value to 8.5, add 4.07Kg polyetheramine D-230, stir evenly, then raise the temperature to 80°C, and continue the reaction for 1.0 hour, Obtain dialdehyde modified product;

[0044] (2) First mix 6.50Kg melamine and 21.00Kg pure water at room temperature, adjust the pH value to 8.5, then add the dialdehyde modified product prepared in step (1) in three equal parts, each interval 10 minutes, react at a temperature of 75°C for 1.0 hour, then raise the temperature to 85°C, and continue to react for 10 minutes to obtain a non-ionic amino resin prepolymer;

[0045] (3) Add 11.49Kg diethylene glycol to the nonionic amino resin prepolymer obtained in step (2), adjust the pH value to 4, then react at 60°C for 2 hours, and finally adjust the pH value to neutrality, the product Be the amino resin retanning agent product of the present embodiment.

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Abstract

The invention discloses a preparation method of an amino resin retanning agent. The preparation method comprises the following steps: firstly, modifying a dialdehyde monomer by using amino-terminatedpolyoxyethylene ether to obtain a dialdehyde modifier, then carrying out nucleophilic addition reaction with an amino monomer to generate a non-ionic amino resin prepolymer, finally adding an etherifying agent to seal free aldehyde groups, and adjusting the pH value to be neutral so that the amino resin retanning agent is obtained, wherein the molar ratio of primary amino in the amino monomer to aldehyde groups in the dialdehyde monomer is 1: 1.3-1: 3, and the proportion of unreacted aldehyde groups in the dialdehyde modifier is 40%-90%. The invention further discloses the retanning agent andan application thereof. According to the amino resin retanning agent provided by the invention, salt reactants are not involved in the whole process, the product quality is good, the comprehensive performance is high, the retanning performance can be comparable with that of a traditional amino resin retanning agent, formaldehyde is not used as a raw material in the preparation process, and the risk of residual formaldehyde brought by the retanning agent in finished leather processing is fundamentally eliminated.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a preparation method of a novel amino resin retanning agent, the retanning agent and its application. Background technique [0002] With the continuous development of the tanning industry, retanning technology is becoming more and more important in the tanning process, especially in the retanning of leather, which plays a decisive role in improving the quality of leather and increasing the varieties of colors. [0003] At present, the main retanning agents used in China are acrylic and amino resins. As a synthetic tanning agent, amino resin is an extremely important retanning agent. It is mainly used in pre-tanning, retanning and filling. It has good thickening effect and filling performance, especially for softer parts, and can promote Subsequent chemical materials (such as fatliquor and dyes, etc.) combined with leather, and effectively avoid the "fading" ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/42C14C3/22
CPCC08G12/427C14C3/22Y02P70/62
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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