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Catalyst system and application in use for synthesizing degradable polyester

A catalyst and system technology, which is applied in the field of catalyst system for homopolymerization and copolyester synthesis, can solve the problems of yellow color of the product, many side reactions, and slow polymerization reaction speed, so as to increase the molecular weight of the polymerization product and accelerate the polymerization reaction speed , the effect of increasing the number average molecular weight

Active Publication Date: 2008-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of the former is serious side reactions, poor stability and yellow color of the obtained polyester products; the latter has certain toxicity, which limits the application field of polyester products
[0008] In summary, existing polyester catalysts have disadvantages such as slow polymerization rate, many side reactions, toxicity, and yellowish product color.
In the biodegradable copolyester synthesis technology, in addition to the above shortcomings, there are also shortcomings such as complex operation process and wide molecular weight distribution of polymerization products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0063] Example 1-4 Preparation of Rare Earth Catalyst C1

Embodiment 1

[0064] Example 1 Anhydrous lanthanum chloride (LaCl 3 ) preparation

[0065] 10g La 2 o 3 Dissolve with excess hydrochloric acid, add metered NH after heating and concentrating 4 Cl(with La 2 o 3 The molar ratio is 3 / 1,), and the excess acid is evaporated by careful heating to obtain LaCl 3 ·nH 2 O+NH 4 For the solid of Cl, grind the solid and add it to the quartz sublimation tube, vacuumize to <5mmHg; slowly heat up to 400°C in the tube furnace, and keep the vacuum for 1hr; cool to room temperature under vacuum, fill with argon, Remove the sublimation tube and transfer it into the tube under the protection of argon for standby.

Embodiment 2

[0066] Example 2 Lanthanum acetylacetonate La(a c a c ) 3 preparation of

[0067] In a 250ml three-necked bottle, LaCl 3 ·7H 2 O (3.47g, 9.37mmol) was dissolved in 50ml of water, added dropwise to 50ml of aqueous solution of acetylacetone (5.63g, 56.2mmol), stirred at room temperature, and adjusted to pH 7 by adding 2NKOH solution. The reaction mixture carries La(a c a c ) 3 The precipitate was stirred, filtered, and vacuum-dried at 60°C to obtain about 4g La(a c a c ) 3 .

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Abstract

This invention publishes a biodegradable polyester catalyst system and its application. Such a catalyst system as a binary system consists of rare earth compound C1 and one of the compounds of titanium, stibium and zincum C2, with a C1 / C2 mole ratio of 5:95~100:0. The catalyst is specifically applicable in preparing polyesters with an aliphatic groups / aromatic groups mole ratio of 35 / 65~100 / 0 and a weight-average molecular weight of 3000~200000g / mol (identified by GPC). The catalyst system in this invention significantly promotes the condensation polymerization rate and product molecular weight and improves the problem of yellow-color products from single-component titanium catalyst system.

Description

technical field [0001] The invention relates to a catalyst system for synthesizing polyester and its application, in particular to a catalyst system for synthesizing degradable homopolymerization and copolyester and its application. Background technique [0002] At present, the preparation of polyester by condensation polymerization is a relatively mature process route, and most of them use compounds such as titanium and zinc or heavy metal compounds such as lead, tin, antimony, and cadmium as catalysts in the stages of esterification, transesterification, and polycondensation reactions. The problem of the former is that the side reaction is serious, the obtained polyester product has poor stability and yellow color; the latter has certain toxicity, which limits the application field of the polyester product. The germanium oxide catalyst system with better effect is difficult to popularize because of its high price. Therefore, the development of a new type of catalyst syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/84C08G63/183
Inventor 陈伟祝桂香陈锡荣张伟闫一凡张艳霞吕静兰
Owner CHINA PETROLEUM & CHEM CORP
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