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A kind of aldehyde-terminated hyperbranched polymer leather retanning agent and preparation method thereof

A hyperbranched polymer and retanning agent technology, applied in the chemical industry, can solve the problems of reducing the free formaldehyde content of finished leather, the effect is not obvious, and the reactivity is low, and achieve the effect of high reactivity, reduced dosage, and enhanced effect

Active Publication Date: 2018-04-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a leather retanning agent of a hyperbranched polymer with terminal aldehyde group and its preparation method, in order to reduce the free formaldehyde content in the finished leather under the premise of obtaining good retanning performance, and overcome the reaction existing in the prior art Disadvantages of low activity, large usage and ineffective effect

Method used

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  • A kind of aldehyde-terminated hyperbranched polymer leather retanning agent and preparation method thereof
  • A kind of aldehyde-terminated hyperbranched polymer leather retanning agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Step 1: See figure 1 , mix trimethylolpropane and glyoxylic acid at a molar ratio of 1:3.5, raise the temperature to 100°C; when the system becomes a uniform molten state, feed nitrogen into the bottom of the reactor until the reactor inside Evacuate the air, add 20ml of carbon tetrachloride and 3% (according to the mass of the reactant) phosphoric acid at the same time, slowly raise the system temperature to 110°C and continue the reaction for 5h; after the reaction, stop feeding nitrogen, and pump the system Vacuum, continue to increase the temperature of the reaction system to 140°C and continue to react for 3 hours under a vacuum of 0.1Mpa. After the reaction is completed, the product is extracted and purified with 80% (according to the mass of the crude product) ethanol (95%) to prepare got a B 3 monomer;

[0019] Step 2: see figure 2 , a certain amount of B 3 Add the monomer to the reactor, then press B 3 The molar ratio of monomer to ethylenediamine is 1:4....

Embodiment 2

[0021] Step 1: First, mix glycerin and glyoxylic acid at a molar ratio of 1:4, raise the temperature to 100°C; when the system becomes a uniform molten state, feed nitrogen into the bottom of the reactor until the air inside the reactor Evacuate, add 20ml of carbon tetrachloride and 3% (according to the mass of reactant) p-toluenesulfonic acid at the same time, continue to react for 4h after raising the system temperature slowly to 120 ℃; The system was evacuated, and the temperature of the reaction system was continuously raised to 150° C. under a vacuum degree of 0.08 Mpa to continue the reaction for 3.5 hours. After the reaction was finished, the product was extracted and purified with 80% (by crude product mass) ethanol (95%) to obtain B 3 monomer;

[0022] Step 2: Add a certain amount of B 3 Add the monomer to the reactor, then press B 3 The molar ratio of monomer to urea is 1:3.5. Dissolve a certain amount of urea in water, and then slowly add it dropwise into the rea...

Embodiment 3

[0024] Step 1: First mix trimethylolpropane and glyoxylic acid at a molar ratio of 1:4.5, raise the temperature to 100°C; when the system becomes a uniform molten state, feed nitrogen into the bottom of the reactor until the reaction Evacuate the air inside the device, add 20ml carbon tetrachloride and 3% (according to the reactant mass) sulfuric acid at the same time, slowly raise the system temperature to 130°C and continue the reaction for 3h; after the reaction is over, stop feeding nitrogen, and The system was evacuated, and the temperature of the reaction system was continuously raised to 160° C. under a vacuum degree of 0.06 Mpa to continue the reaction for 4 hours. After the reaction was finished, the product was extracted and purified with 80% (by crude product mass) ethanol (95%) to obtain B 3 monomer;

[0025] Step 2: Add a certain amount of B 3 Add the monomer to the reactor, then press B 3 The molar ratio of monomer to isophorone diamine is 1:4.5. Dissolve a ce...

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Abstract

The invention relates to an aldehyde group-terminated hyperbranched polymer leather retanning agent and a preparation method thereof. The preparation method comprises the following steps of: (1) mixing a trihydroxy compound with glyoxalic acid in a molar ratio of 1:3 to 1:5, heating to 100 DEG C to form a uniform melt state, introducing nitrogen to the bottom of a reactor to discharge air, simultaneously adding a water entrainer and a catalyst, reacting at 100-140 DEG C for 1-6h, stopping nitrogen introduction, reacting at 140-170 DEG C and vacuum degree of 0.02-0.1Mpa for 1-5h, and purifying with ethanol to prepare a monomer B3; and (2) reacting the monomer B with ethanediamine in a ratio of 1:3 to 1:5 to obtain the aldehyde group-terminated hyperbranched polymer leather retanning agent after the reaction is finished. Under the premise of good retanning property, the retanning agent has the advantages that the free formaldehyde content of the leather is reduced, and the shortcoming that the reaction activity is low, the use amount is large and the effect is not obvious in the prior art are overcome.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to an aldehyde-terminated hyperbranched polymer leather retanning agent and a preparation method thereof. Background technique [0002] In leather processing and production, retanning is a further supplement to tanning, and it plays an important role in improving the softness, fullness, moisture resistance and stability of leather. Conventional aldehyde tanning agent is glutaraldehyde tanning agent, although it has the advantages of fast binding speed with bare hide, large binding amount, water-resistant, sweat-resistant, and alkali-resistant finished leather. However, since aldehyde tanned leather is not resistant to yellowing, this greatly limits its application range. In view of this defect, various methods are used at home and abroad to attempt to modify glutaraldehyde in order to obtain an aldehyde tanning agent with good performance and wide application fields, but this retan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00C14C3/22
CPCC08G83/005C14C3/22
Inventor 任龙芳张健王学川强涛涛
Owner SHAANXI UNIV OF SCI & TECH
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