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Modified glutaraldehyde tanning agent and preparation method and applications thereof

A glutaraldehyde tanning agent and glutaraldehyde technology are applied in the chemical industry and can solve the problems of high formaldehyde content and the like

Active Publication Date: 2014-11-26
BEIJING FANBO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of this, many experts at home and abroad use various methods to modify glutaraldehyde. The related modified glutaraldehyde technology is to directly use formaldehyde to modify glutaraldehyde. Although this method can solve the problem of yellowing, the modified The free formaldehyde content in the final glutaraldehyde solution and tanned products is a lot

Method used

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preparation example Construction

[0017] The preparation method corresponding to the modified glutaraldehyde tanning agent of this embodiment comprises:

[0018] Add glutaraldehyde and ethylene glycol into the reactor respectively, and mix to obtain the first mixture;

[0019] Adding an alkaline substance for adjusting the pH value to the reactor, adjusting the pH value to 7-9;

[0020] raising the temperature inside the reactor to 80-90°C and keeping it warm for a first set time to obtain the first product;

[0021] Adding formaldehyde to the first product, and adding the alkaline substance for adjusting the pH value to the reactor, adjusting the pH value to 8-10;

[0022] raising the temperature inside the reactor to 90-100°C, and keeping it warm for a second set time to obtain a second product;

[0023] cooling the inside of the reactor to 70-80°C, adding an acidic substance for adjusting the pH value into the reactor, adjusting the pH value to 3-5, and keeping the temperature for the third set time to ob...

Embodiment 1

[0054] (1) Add 120 parts of glutaraldehyde and 160 parts of ethylene glycol into the reactor respectively, pass reflux condensed water, stir evenly, add 20 parts of 30% sodium hydroxide to make the pH value between 7 and 9, Raise the temperature to 80-90°C and keep it warm for 2-3 hours;

[0055] (2) Add 200 parts of formaldehyde to the above solution, and add 10 parts of 30% sodium hydroxide to make the pH value between 8 and 10, raise the temperature to 90 to 100°C, and keep the temperature for 2 to 3 hours;

[0056] (3) Cool down to 70-80°C, add 10 parts of hydrochloric acid to make the pH value between 3-5, and keep warm for 2-3 hours;

[0057] (4) Transfer the above solution into a pear-shaped bottle, vacuumize for 2 hours at 0.8-1.0Mpa, 50-80°C, and obtain a colorless or light yellow viscous liquid, which is the modified glutaraldehyde tanning agent.

Embodiment 2

[0059](1) Add 120 g of glutaraldehyde and 160 parts of ethylene glycol into the reactor respectively, pass reflux condensed water, stir evenly, add 8 parts of triethylamine to make the pH value between 7 and 9, and raise the temperature to 80 ~90℃, keep warm for 2~3 hours;

[0060] (2) Add 200 parts of formaldehyde to the above solution, and add 5 parts of triethylamine to make the pH value between 8 and 10, raise the temperature to 90 to 100°C, and keep the temperature for 2 to 3 hours;

[0061] (3) Cool down to 70-80°C, add 5 parts of sulfuric acid to make the pH value between 3-5, and keep warm for 2-3 hours;

[0062] (4) Transfer the above solution into a pear-shaped bottle, vacuumize for 2 hours at 0.8-1.0Mpa, 50-80°C, and obtain a colorless or light yellow viscous liquid, which is the modified glutaraldehyde tanning agent.

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Abstract

The invention relates to the field of biochemical engineering, and particularly relates to a modified glutaraldehyde tanning agent and a preparation method and applications thereof. The modified glutaraldehyde tanning agent comprises the following raw materials in part by weight: 100-300 parts of glutaraldehyde, 50-200 parts of ethylene glycol, 100-300 parts of formaldehyde, 1-50 parts of alkaline substances for adjusting pH value and 1-50 parts of acidic substances for adjusting pH value. The invention also provides a preparation method and applications of the modified glutaraldehyde tanning agent, and a glutaraldehyde tanning agent modified by using the method has extremely low free formaldehyde content.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a modified glutaraldehyde tanning agent and its preparation method and application. Background technique [0002] Glutaraldehyde is a fatty aldehyde containing two very active aldehyde groups. It is developed on the basis of dialdehyde-resin tanning. As an excellent tanning agent, it is favored by people at home and abroad and is very popular. It was first used in industry. Its characteristics are as follows: (1) The speed and binding amount of glutaraldehyde absorbed by bare leather are relatively prominent; (2) The glutaraldehyde aqueous solution used for tanning will not undergo self-polymerization, so it will not cause the grain surface of the leather to become resinous and harden Brittle phenomenon; (3) glutaraldehyde-made leather is resistant to washing, sweat and alkali, and tanned leather alone is better than formaldehyde. Although glutaraldehyde has many advantages, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08
Inventor 郝安生郑红超郑超斌李枝菁
Owner BEIJING FANBO CHEM