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Low carboxyl biodegradable polyester and its production method

A technology of biodegradable polyester and production method, applied in the field of low carboxyl biodegradable polyester and its production, can solve the problems of unstable product performance and high production cost, achieve low carboxyl level, avoid production cost, and reduce side reactions Effect

Active Publication Date: 2017-01-25
新疆维格瑞生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a low carboxyl biodegradable polyester and its production method, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problems in the existing technology Problems of high production cost and unstable product performance when reducing the degradation rate of biodegradable polyester

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013]Embodiment 1, the low-carboxyl biodegradable polyester, including raw materials by weight is 40 to 100 parts of 1,6-adipic acid or / and 1 to 60 parts of terephthalic acid and 80 to 100 parts of 1 , 4-butanediol, wherein the low carboxyl biodegradable polyester is obtained by the following production method: in the first step, the required raw materials are placed in a reactor, and the temperature of the materials in the reactor is raised to 80°C to 100°C, then mix the materials evenly and add tetrabutanol titanate with a weight of 50ppm to 250ppm of the raw materials, then at a pressure of -40KPa to -80KPa, a temperature of 225°C to 230°C, and a stirring rate of 50r / min to 100r / min The esterification reaction is carried out under the condition of 1 min, and when the weight fraction of the esterification water collected reaches 15 parts to 55 parts, the esterification reaction is stopped; in the second step, after the esterification reaction is finished, the pressure in the...

Embodiment 2

[0014] Embodiment 2, this low carboxyl biodegradable polyester, comprises raw material and is 40 or 100 parts by weight 1,6-dipic acid or / and 1 or 60 parts of terephthalic acid and 80 or 100 parts of 1 , 4-butanediol, wherein the low carboxyl biodegradable polyester is obtained by the following production method: in the first step, the required raw materials are placed in a reactor, and the temperature of the materials in the reactor is raised to 80°C or 100°C, then mix the materials evenly and add tetrabutanol titanate with a raw material weight of 50ppm or 250ppm. Under the condition of 1 min, carry out esterification reaction, when the weight fraction of the esterification water that collects reaches 15 parts or 55 parts, stop esterification reaction; Second step, after esterification reaction finishes, the pressure in the reactor is adjusted to Atmospheric pressure, then add the composite titanium series catalyst of raw material weight 50ppm or 1000ppm in the reaction kett...

Embodiment 3

[0015] Embodiment 3, as the preferred embodiment of the above, the composite titanium catalyst includes 50 parts to 98 parts of organotitanium compound, 1 part to 50 parts of organosilicon compound and 1 part to 10 parts of metal salt compound in parts by weight , wherein the organic titanium compound is tetramethyl titanate, tetraethyl titanate, tetrapropanol titanate, tetrabutanol titanate, tetraisopropyl titanate, tetraisobutanol titanate, titanic acid Tetra-tert-butanol ester, tetraisooctanyl titanate, tetracyclohexyl titanate, tetrabenzyl titanate, titanium cresylate, titanium acetylacetonate, titanium ethylene glycol, polybutylene titanate, etc. One or more of them; organosilicon compounds are trimethylethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, diphenyldimethoxysilane, cyclohexylmethyldi Methoxysilane, γ-aminopropylmethyldiethoxysilane, hexadecyltrimethoxysilane, 3-aminopropyltriethoxysilane, vinyltriethoxysilane, methyl silicate , ethyl silicate, pr...

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Abstract

The invention relates to the technical field of polyester high-molecular materials, and particularly relates to a low-carboxylated biodegradable polyester and a production method thereof. The low-carboxylated biodegradable polyester comprises1,6-adipic acid or / and terephthalic acid and 1,4-butanediol. According to the preparation method of the low-carboxylated biodegradable polyester, the content of carboxyl end groups in the polyester can be furthest reduced by adopting a compound titanium catalyst and a carboxyl scavenger to produce condensation polymerization in the later period of esterification; the catalytic activity of titanium catalyst can be controlled by adding chelate with stabilizing effect, so as to avoid the side degradation reaction caused by the high activity of the catalyst in the later period of condensation reaction and furthest reduce the side reaction in the later period of the condensation reaction, so that the low-carboxylated level of the finished polyester product can be guaranteed, other additives are not additionally needed for modifying the product, the content of carboxyl end groups in the product can be reduced, and the high production cost of the product can be avoided.

Description

technical field [0001] The invention relates to the technical field of polyester polymer materials, and relates to a low carboxyl biodegradable polyester and a production method thereof. Background technique [0002] Today, plastic is a class of materials that forms an important complement to materials such as wood, steel, ceramics, and cement. It has been widely used and has greatly changed our lives. However, the use of traditional plastics has caused serious "white pollution", which stems from the fact that when people pay attention to the performance of traditional plastic products, they ignore their environmental absorbability. Traditional plastics can remain in the environment for decades, or even hundreds of years, and it is difficult to completely degrade. The increasingly severe "white ecological pollution" problem has made the development of environmentally friendly plastic products a consensus of countries all over the world. With the support of various incentiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08G63/16C08G63/85C08G63/87
Inventor 丁建萍潘哆吉李鹏陈文生龙彦博余万学张志成王帅董泽娟
Owner 新疆维格瑞生物科技有限公司
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