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Copolymerized ester and method for making heat-shrinkable double-pipe using same

A technology of heat-shrinkable sleeve and copolyester, which is applied in the field of copolyester and the heat-shrinkable sleeve made of this copolyester, which can solve the problems of high price

Active Publication Date: 2006-07-26
NANYA PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another U.S. Patent No. 5,718,953 uses polyphenylene sulfide to make heat-shrinkable sleeves. Although it has good heat aging resistance, it is expensive

Method used

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  • Copolymerized ester and method for making heat-shrinkable double-pipe using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Get 10.27 parts by weight of diethylene glycol terephthalate monomer (BHET), and 0.432 parts by weight of isophthalic acid (IPA) and 3.243 parts by weight of ethylene glycol (EG) are put into the reaction tank. When the temperature reaches above 190°C, the esterification reaction starts, and the reaction pressure is 1.0-1.5Kg / cm 2 , react for 180 minutes to make the esterification rate reach more than 95%, add 0.035 parts by weight of titanium dioxide, stabilizer phosphoric acid, and catalyst antimony acetate, and then start vacuuming, so that the temperature of the material is 250 ~ 280 ° C and the reaction is under a vacuum environment of 1 torr When the viscosity is above 0.60 liters / g, it is unloaded and cooled to form cylindrical amorphous raw particles; then the prepared raw particles are put into the solid-state polymerization reaction device, so that the temperature of the ester particles is 190~ At 220°C, increase the viscosity of the ester pellets to 0.95 lite...

Embodiment 2

[0038] As in Example 1, but the diethylene glycol terephthalate monomer (BHET) of 9.73 parts by weight and the isophthalic acid (IPA) of 0.864 parts by weight are put into a reactor and reacted to complete melt polymerization Finally, solid-state polymerization was carried out to increase the viscosity to 0.97 liters / gram; then, various tests were carried out on the heat-shrinkable sleeve made, and the results are shown in Table 1.

Embodiment 3

[0040] As in Example 1, but the diethylene glycol terephthalate monomer (BHET) of 9.186 parts by weight and the isophthalic acid (IPA) of 1.296 parts by weight are put into a reactor and reacted to complete melt polymerization Carry out solid-state polymerization again and increase viscosity to 1.05 liters / gram, when the polyester of this embodiment is carrying out solid-state polymerization, need the warming-up heating condition that is gentler than embodiment 1, otherwise agglomeration phenomenon will occur; The heat-shrinkable sleeves were tested, and the results are shown in Table 1.

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Abstract

This invention refers to the thermoplastic copolyester, whose viscosity can be increased to between 0.85L / g and 1.05L / g after polymerization, and can be used in producing heat shrinking sleeve. The invention also refers to a way of making heat shrinking sleeve: the heat shrinking copolyester is changed into tubular shape after being melted and is made into copolyester heat shrinking sleeve after being huffed and stretched. And the lengthways shrinkage of the heat shrinking sleeve (MD) is no more than 15%, the transverse shrinkage (TD) is no less than 14%. This kind of heat shrinking sleeve can be used as the coats and insulating coats of all kind of conductors.

Description

technical field [0001] The present invention relates to a modified thermoplastic copolyester, in particular to a method for making a heat-shrinkable sleeve by using the copolyester, and the heat-shrinkable sleeve made has proper heat resistance after heat treatment. Shrinkage rate, and good heat resistance, chemical resistance and heat aging resistance, after high temperature heating, it can still maintain close contact with the coating, without expansion, relaxation or wrinkles, etc. It can be used as an insulation coating for electronic parts use. Background technique [0002] Common electrical insulation heat shrinkable sleeves have been made of PVC for a long time, but with the trend of prohibiting the use of PVC, countries such as Europe and Japan have required that PVC should not be used as a material in electrical equipment. [0003] To this end, the prior art US Patent No. 5,368,811 discloses a polyester and a method of using the polyester to make a heat-shrinkable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08K3/36B29C55/26B29C61/08
Inventor 简日春
Owner NANYA PLASTICS CORP
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