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Method for producing aliphatic polyester and the aliphatic polyester

A technology of aliphatic polyester and aliphatic dicarboxylic acid, applied in the field of aliphatic polyester, can solve the problems of reduced biodegradability of polyester, weak thermal stability, difficult to use catalyst, etc., to achieve thermal stability and tensile strength. Excellent elongation, effect of reducing thermal decomposition and thermal deterioration

Active Publication Date: 2006-12-06
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some problems: the reaction process involves two steps, and thus is complicated, and for the obtained polyester, in addition to slightly lowering its crystallinity and melting point, due to the urethane bond contained in the molecule ), leading to a tendency to reduce the biodegradability of the resulting polyester
Moreover, there is a problem that a deactivated catalyst may be introduced into the product as a lump, thereby causing problems in the plastic molding process, the shape of the molded product, etc.
However, in the preparation of aliphatic polyesters with weak thermal stability, it is generally difficult to use catalysts, and there are still problems of how to increase the polymerization rate at low temperatures or how to improve the thermal stability of polyesters

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0135] During the preparation process of the present invention or for the obtained polyester, various additives such as heat stabilizers, antioxidants, crystallization nucleating agents, flame retardants, antistatic agents can be added within the range of not destroying properties during polymerization , Demolding, UV absorbers, etc.

[0136] Moreover, when molding, in addition to the above-mentioned various additives, reinforcing agents and fillers can be added, such as glass fiber, carbon fiber, titanium whisker, mica, talc, CaCO 3 、TiO 2 or silica, which can then be molded.

[0137] Since the polyester obtained by the method of the present invention is excellent in heat resistance and color tone, and is also excellent in hydrolysis resistance and biodegradability, and can be produced at low cost, it is suitable for various Applications for film and injection molded products.

[0138] Specific applications include injection molded products (such as trays for fresh food, c...

Embodiment 1

[0146] Catalyst preparation

[0147] Weigh 300ml of ion-exchanged water in a 1L beaker. After the beaker was cooled in an ice bath, 20ml of titanium tetrachloride (TiCl 4 ). After the dropwise addition, when the generation of hydrogen chloride ceased, the beaker was removed from the ice bath. Add 4.1 g of magnesium chloride hexahydrate (MgCl 2 ·6H 2 O), and dissolve it. Furthermore, 22.2 g of tetraethoxysilane (Si(OC 2 h 5 ) 4 ). Then, under the stirring beaker, 4N ammonia water was added dropwise until the pH of the liquid in the beaker reached 7.4. The precipitate formed by the dropwise addition was suction-filtered, washed, dried at 80° C. under reduced pressure, and pulverized to 100 μm or less to obtain a composite oxide catalyst. The Ti:Mg:Si atomic ratio of the feed in this example was 60:7:33.

[0148] melt polycondensation

[0149] Add 100.3g (0.85mol) of succinic acid, 81.9g (0.91mol) of 1,4-butanediol, 0.37g (2.8 ×10 -3 mol, 0.33 mol% relative to succi...

Embodiment 2

[0152] Catalyst preparation

[0153] In addition to using titanium tetrachloride (TiCl 4 ), using magnesium chloride hexahydrate (MgCl 2 ·6H 2 O) and tetraethoxysilane (Si(OC 2 h 5 ) 4 ), carry out the same operation as in Example 1. The Ti:Mg:Si atomic ratio of the feed in this example was 14:14:72. The average particle diameter of the obtained composite oxide catalyst was 44 μm.

[0154] melt polycondensation

[0155] Except for using 0.18 g of the composite oxide catalyst prepared in Example 2 as a catalyst, the same operations as in Example 1 were performed for the starting material charge. Then, the internal system was made into a nitrogen atmosphere by nitrogen substitution under reduced pressure.

[0156] Then, the internal system was heated to 220° C. with stirring, and reacted at this temperature for 1 hour. Then, the temperature was raised to 230 °C within 30 minutes, and at the same time the pressure was reduced to 0.07×10 within 1 hour and 30 minutes 3 P...

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Abstract

An object of the present invention is to provide an aliphatic polyester with a high polymerization degree having an excellent thermal stability and an industrially advantageous and efficient process for producing the same. In the invention, at the production of a polyester having diol unit(s) and aliphatic dicarboxylic acid unit(s), a metal oxide containing at least one element selected from the group consisting of metal elements belonging to the Groups 3 to 6 of the Periodic Table and at least one element selected from the group consisting of silicon element and metal elements belonging to the Groups 1, 2, 12, 13, and 14 of the Periodic Table is used as a catalyst.

Description

technical field [0001] The present invention relates to a process for preparing aliphatic polyesters and aliphatic polyesters. More specifically, the present invention relates to the preparation of an environmentally friendly aliphatic polymer having excellent molding properties in injection molding, blow molding, extrusion molding, etc. and having excellent thermal stability, tensile properties, and biodegradability. The method of ester, and the aliphatic polyester obtained by this method. Background technique [0002] Due to growing concerns about environmental issues, aliphatic polyesters having biodegradability have been used for fibers, molded articles, films, sheets, and the like as resins to further avoid environmental burdens. For example, biodegradable polybutylene succinate and / or polybutylene adipate have been developed as alternative polymers to polyethylene because they have mechanical properties similar to polyethylene. [0003] As an economically favorable m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/82
CPCC08G63/82
Inventor 青岛敬之星野丰正二村均
Owner MITSUBISHI RAYON CO LTD
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