Polyester elastomer composition

A technique of polyester elastomer and composition, which is applied in the field of polyester elastomer composition, and can solve problems such as concentration reduction and inability to fully capture polycarbodiimide

Inactive Publication Date: 2007-02-14
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] As a method of improving the hydrolysis resistance of polyester, the method of adding polycarbodiimide is the best. However, since conventional polycarbodiimide reacts with water, the The concentration decreases, and there is a disadvantage that the original function of polycarbodiimide, such as capturing protonic acid generated by ester hydrolysis, cannot be fully realized

Method used

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  • Polyester elastomer composition
  • Polyester elastomer composition
  • Polyester elastomer composition

Examples

Experimental program
Comparison scheme
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Embodiment 1～3

[0072] The polyester elastomer (A), epoxy compound (B), and polycarbodiimide compound (C) were mixed according to the compounding ratio (unit: parts by weight) described in Table 1. Then, it was melt-kneaded and extruded at 250° C. with a 30 mmφ twin-screw extruder, and the obtained strands were cooled in a water tank, and then sheared with a pelletizer to obtain pellets of the polyester elastomer composition. The obtained pellets were dried at 120° C. for 5 hours while flowing nitrogen gas.

[0073] Using the above pellets, a test piece for tensile test and a test piece for Charpy impact test were molded by an injection molding machine at 260°C.

[0074] The evaluation results are described in Table 1. By adding epoxy compounds and specific carbodiimide compounds, mechanical properties can be maintained, water resistance test results become better, and hydrolysis resistance is improved.

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Abstract

The invention relates to a polyester elastomer composition which comprises (A) 100 parts by weight of a polyester elastomer, (B) 0.01 to 10 parts by weight of an epoxy compound having one or more epoxy groups per molecule, and (C) 0.01 to 10 parts by weight of a polycarbodiimide compound which has two or more carbodiimide groups per molecule and in which the two carbon atoms adjacently bonded respectively to both sides of one of the carbodiimide groups each has at least one C1-4 alkyl or at least one substituent having the effect of electronically reducing reaction rate. The composition is excellent in hydrolytic resistance, heat resistance, oil resistance, wearing resistance, and impact resistance.

Description

technical field [0001] The present invention relates to a polyester elastomer composition containing a polyester elastomer, an epoxy compound, and a polycarbodiimide compound, and the hydrolysis resistance, heat resistance, and oil resistance of processed products obtained from the polyester elastomer composition , Excellent impact resistance and wear resistance. Background technique [0002] Polyester elastomers are preferably used in automobile parts and the like because of their excellent physical properties such as heat resistance, oil resistance, and impact resistance. However, due to the poor hydrolysis resistance of polyester elastomers, it is easy to cause thermal deterioration during processing, and has major problems such as a sharp drop in strength or impact resistance, unstable melt viscosity during molding processing, or problems in durability as automotive parts. Shortcomings. [0003] Various studies have been made to improve the hydrolysis resistance of pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/00C08K5/1515C08K5/29
CPCC08K5/1515C08K5/29C08L67/00
Inventor 坂西裕一
Owner DAICEL CHEM IND LTD
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