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Hyperbranched polymer leather retanning agent capable of reducing content of free formaldehyde

A technology of hyperbranched polymers and free formaldehyde content, applied in the field of chemical polymers, can solve the problems that leather products cannot meet the needs of consumers, achieve the effects of low toxicity, reduce potential pollution, and increase the shrinkage temperature of finished leather

Inactive Publication Date: 2021-04-30
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the progress and development of the times, people's demand for high-performance and high-quality leather products continues to rise, and leather products with a single performance can no longer meet the needs of consumers

Method used

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  • Hyperbranched polymer leather retanning agent capable of reducing content of free formaldehyde

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Embodiment Construction

[0010] The first embodiment of the hyperbranched polymer leather retanning agent that can reduce the free formaldehyde content of the present invention is as follows: comprise the following steps, mix 34 parts of pentaerythritol with 672 parts of hexamethylene diisocyanate, add 0.6 part of capric acid Bismuth, keep at 80°C, react for 50min under nitrogen atmosphere, add 136 parts of pentaerythritol, keep at 80°C, react for 50min, add 672 parts of hexamethylene diisocyanate, keep at 80°C, react for 50min, cool down to 50°C, add 756 parts Tetraethylenediamine was kept at 50°C for 30 minutes to react to obtain a hyperbranched polymer leather retanning agent that can reduce the content of free formaldehyde.

[0011] The second embodiment of the hyperbranched polymer leather retanning agent that can reduce the free formaldehyde content of the present invention is as follows: comprise the following steps, mix 34 parts of pentaerythritol with 672 parts of hexamethylene diisocyanate, a...

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Abstract

The invention discloses a hyperbranched polymer leather retanning agent capable of reducing the content of free formaldehyde. Pentaerythritol is used as a core, hexamethylene diisocyanate, pentaerythritol and hexamethylene diisocyanate are used for successive chain extension, and finally tetraethylene pentamine is used for terminating to prepare a hyperbranched polymer containing multiple amino groups. The retanning agent has good retanning performance, and amino and imino in tanning agent molecules can effectively reduce the content of free formaldehyde in leather, so that integration of retanning and formaldehyde removal is realized, the process is simplified, and the cost and the energy consumption are reduced.

Description

technical field [0001] The invention relates to the technical field of chemical polymers, in particular to a hyperbranched polymer leather retanning agent capable of reducing free formaldehyde content. Background technique [0002] my country is a big leather-making country with an annual output value of about 1.35 trillion yuan. Natural leather uses animal raw hide as raw material. After a series of complex physical and chemical processes, this natural polymer is endowed with good physical and mechanical properties, excellent hygienic performance and elegant appearance and texture. It has been widely used in various products for a long time. daily necessities and industrial products. Retanning is to tan the tanned leather again, which occupies a large proportion in the whole leather-making process. Through retanning, the chemical stability of the leather can be improved, the body and grain of the leather can be improved, and the yield can be increased. Leather rate, givin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/22C08G18/32
CPCC14C3/22C08G18/3206C08G18/3228
Inventor 田赛琦丁昇朱一凡陈银燕
Owner WENZHOU UNIVERSITY