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Synthesis method of end carboxyl super branched polymer as high absorption chrome tanning adjuvant

A technology of a hyperbranched polymer and a synthesis method, which is applied in the field of preparation of carboxyl-terminated hyperbranched polymers, can solve the problems of unimproved leather quality and pollution, and achieves the advantages of reducing chromium pollution, solving pollution problems and saving chromium salts. Effect

Inactive Publication Date: 2010-05-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention overcomes the serious pollution problem existing in the prior art and the problem that the leather quality cannot be improved

Method used

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  • Synthesis method of end carboxyl super branched polymer as high absorption chrome tanning adjuvant
  • Synthesis method of end carboxyl super branched polymer as high absorption chrome tanning adjuvant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: first trimethylolpropane and dimethylol propionic acid are mixed in a molar ratio of 1:9, then adding trimethylolpropane mass percentage is 5% p-toluenesulfonic acid and trimethylol propionic acid The amount of methylpropane substance is 500mL / mol N,N-dimethylacetamide, then react at a temperature of 160°C for 8h, and vacuumize to obtain a pure intermediate; the temperature is lowered to 80°C, and the Maleic anhydride with a hydroxyl molar ratio of 1:1 was reacted for 3 hours to obtain a carboxyl-terminated hyperbranched polymer with high absorption chrome tanning auxiliaries.

Embodiment 2

[0029] Embodiment 2: at first trimethylolpropane and dimethylol propionic acid are mixed by the molar ratio of 1: 12, then add trimethylolpropane mass percentage and be 6% benzenesulfonic acid and trimethylolpropane 700mL / mol of N-methylpyrrolidone based on the amount of propane, reacted at 180°C for 5h, and vacuumed to obtain a pure intermediate; the temperature was lowered to 90°C, and the molar ratio of the hydroxyl group added to the intermediate was 1:1 The succinic anhydride was reacted for 4 hours to obtain a high-absorption chrome tanning auxiliary of a carboxyl-terminated hyperbranched polymer.

Embodiment 3

[0030] Embodiment 3: first trimethylolpropane and dimethylolpropionic acid are mixed in a molar ratio of 1:7, and then adding trimethylolpropane mass percentage is 3% mass fraction and is 98% concentrated sulfuric acid and 800mL / mol dimethyl sulfoxide based on the amount of trimethylolpropane, react at 150°C for 5h, and vacuumize to obtain a pure intermediate; lower the temperature to 70°C, and add the hydroxyl mole of the intermediate The succinic anhydride with a ratio of 1:1.5 was reacted for 1 hour to obtain a high-absorption chrome tanning auxiliary of a carboxyl-terminated hyperbranched polymer.

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Abstract

The invention relates to high- absorption chroming adjuvant technique in tanner industry, which in detail relates to carboxyl-ended ultra branched polymer as high- absorption chroming adjuvant and thepreparation method. It is to provide problems of server environmental pollution and non promotion for leather quality in current technique. The method comprises synthesis of hydroxy-ended ultra branched polymer, synthesis of amido- ended ultra branched polymer and synthesis of carboxyl-ended ultra branched polymer. The invention is characterized by good effect for chromium absorption and fixation, improved leather heat stability, simple synthetic process and easy for industrial production.

Description

Technical field: [0001] The invention relates to the technical field of high-absorption chrome tanning auxiliaries in the leather industry, in particular to a preparation method of a carboxyl-terminated hyperbranched polymer as a high-absorption chrome tanning auxiliaries. Background technique: [0002] The leather industry occupies an important position in our country's economy. In order to realize the sustainable development of the leather industry, the pollution problem in tanning must be solved. One of the biggest pollutants in the leather industry is that produced by the chrome tanning process. Cr 6+ Carcinogenicity has been confirmed, Cr 3+ Although its toxicity and stability in nature are still controversial, it is still listed as one of the heavy metal ions that pollute the environment by the environmental protection departments of various countries. So far, this kind of pollution has not been completely and effectively prevented. In addition, my country’s chromi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/22C08F283/02C08G63/16
Inventor 王学川强涛涛任龙芳
Owner SHAANXI UNIV OF SCI & TECH