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Amphoteric phenol synthetic tanning agent and preparation method thereof

An amphoteric and phenolic technology, which is applied in the field of amphoteric phenolic syntans and its preparation, can solve problems such as the impact on tanning performance, and achieve the effects of reducing adverse effects, improving reactivity, and plumping the leather body

Active Publication Date: 2017-11-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molecular structure is limited to carboxyl groups and does not contain phenolic hydroxyl groups that have a good ability to interact with collagen fibers. Therefore, as a retanning agent for non-metallic tanned leather, it is expected that its tanning performance will be affected to a certain extent.

Method used

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  • Amphoteric phenol synthetic tanning agent and preparation method thereof

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preparation example Construction

[0037] The preparation method of the amphoteric phenolic synthetic tanning agent that the present invention relates to, at first prepare the aromatic compound containing amphoteric group through the Michael addition reaction of aniline and acrylic acid; Then add phenol, formaldehyde and sodium bisulfite wherein, carry out condensation and Sulfomethylation reaction, and finally amphoteric phenol syntans are obtained. Specifically include the following steps:

[0038] Step 1: First, weigh 1 mole of aniline, add 1 mole of acrylic acid dropwise under stirring, and 2 Under protection, raise the temperature to 110-120°C and keep it warm for 3-5 hours to obtain amphoteric aromatic monomers;

[0039] Step 2: Then lower the temperature to 90°C, weigh 1-4 moles of phenol and add it to the reaction system of step 1, then slowly add 1-4 moles of formaldehyde dropwise, adjust the pH value to 2-3 with formic acid, and keep warm for 4 hours Finally, the formaldehyde condensation product of...

Embodiment 1

[0042] Step 1: First, weigh 1 mole of aniline, add 1 mole of acrylic acid dropwise under stirring, and 2 Under protection, the temperature was raised to 110°C for 5 hours to obtain the amphoteric aromatic monomer;

[0043] Step 2: Then lower the temperature to 90°C, weigh 1 mole of phenol and add it to the reaction system of step 1, then slowly add 1 mole of formaldehyde dropwise, adjust the pH value to 2 with formic acid, and obtain the amphoteric aromatic mono The formaldehyde condensation product of body and phenol;

[0044]Step 3: Dissolve 0.6 mole of sodium bisulfite in water and drop it into the reaction system of step 2, then slowly add 0.6 mole of formaldehyde dropwise and react at 90°C for 3 hours, then adjust the pH value to 7 with sodium hydroxide That is, amphoteric phenol syntans are obtained.

Embodiment 2

[0046] Step 1: First, weigh 1 mole of aniline, add 1 mole of acrylic acid dropwise under stirring, and 2 Under protection, the temperature was raised to 115°C for 4 hours to obtain the amphoteric aromatic monomer;

[0047] Step 2: Then lower the temperature to 90°C, weigh 2 moles of phenol and add it to the reaction system of step 1, then slowly add 2 moles of formaldehyde dropwise, adjust the pH value to 2.5 with formic acid, and obtain the amphoteric aromatic mono The formaldehyde condensation product of body and phenol;

[0048] Step 3: Dissolve 0.9 mol of sodium bisulfite in water and drop it into the reaction system of step 2, then slowly add 0.9 mol of formaldehyde dropwise and react at 90°C for 3 hours, then adjust the pH value to 8 with sodium hydroxide That is, amphoteric phenol syntans are obtained.

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Abstract

The invention relates to an amphoteric phenol synthetic tanning agent and a preparation method thereof. The preparation method comprises the following steps: dropwise adding acrylic acid in aniline under stirring, and heating to react under the protection of N2 so as to obtain amphoteric aromatic monomers; cooling, adding phenol, dropwise adding formaldehyde, adjusting the pH value, and carrying out heat preservation reaction, so as to obtain formaldehyde condensate of the amphoteric aromatic monomers and phenol; and dissolving sodium hydrogen sulfite into water, dropwise adding formaldehyde to react, and adjusting the pH value, so as to obtain the amphoteric phenol synthetic tanning agent. According to the preparation method, the amphoteric phenol synthetic tanning agent preserves the good filling property of phenol synthetic tanning agents, and a fading effect of a common anion phenol tanning agent can be improved; and meanwhile, the tanning agent is applicable to a retanning agent for tanning nonmetal crust leather, the tanned crust leather is plump and soft, and the mechanical strength is enhanced.

Description

technical field [0001] The invention relates to a retanning agent, in particular to an amphoteric phenol syntanning agent and a preparation method thereof. Background technique [0002] In recent years, with the development of the automobile industry and the prosperity of the automobile market, the development prospect of automobile leather has become more and more optimistic about the industry. As an integral part of a car, car leather is extremely important for safety and comfort, and it is also indispensable for improving the appearance and grade of cars. In particular, the demand for chrome-free leather (without heavy metals) has a lot of room for the following main reasons: (1) Leather without heavy metals is easier to sell than chrome-tanned leather due to its ecological advantages; ( 2) According to the regulations of the automobile industry on the life of the vehicle (ELV), it will be mandatory to burn the old leather seat cushions in the car in the near future; Hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/08
Inventor 许伟李楠张苑畅菁香张庆何洋洁柴小叶
Owner SHAANXI UNIV OF SCI & TECH