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A kind of preparation method of foaming polyester

A technology of polyester and preparation steps, applied in the field of preparation of polyester for foaming, can solve the problems of side reactions, large limitations, affecting the mechanical properties of products, etc., and achieves convenient post-processing, high melt strength and melt elasticity. Effect

Inactive Publication Date: 2011-12-28
CHINA RESOURCES PACKAGING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two methods have their disadvantages: method 1, the linear structure of polyester molecules does not change, the melt strength and melt elasticity are limited during processing, and the solid phase viscosity increase time is long and the efficiency is low; Method 2. Most additives will have side reactions or generate by-products, which will affect the mechanical properties of the product. At the same time, the amount and type of chain extender are limited by equipment and raw material polyester, which has relatively large limitations.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] Example 1. Mix 8.6KG terephthalic acid, 3.6L ethylene glycol, 0.1KG pentaerythritol, 6g catalyst antimony acetate, and 0.5g heat stabilizer polyphosphoric acid to obtain a slurry; put the prepared slurry into the reaction kettle The esterification reaction is carried out, and the system pressure is controlled at about 0.3MPa when the material temperature rises from normal temperature to 250°C. When the material temperature reaches 250°C, the system is released to normal pressure for reaction, and the reaction temperature is controlled at: 260-265 ℃, reaction time: 150min; after the esterification reaction, add trimellitic anhydride 0.2 KG to the system, stir for 10 minutes and then carry out polycondensation reaction, first slowly reduce the system pressure, and after 1 hour, the system pressure will be reduced to 40-60Pa, and the reaction temperature will be controlled at 275 ~280°C, the entire polycondensation reaction time: 120min; after the polycondensation reaction ...

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Abstract

The invention relates to a method for preparing polyester for foaming. The preparation steps are as follows: (1) Slurry preparation: mix terephthalic acid, ethylene glycol, and pentaerythritol in a certain molar ratio, and simultaneously add a catalyst, heat stabilizer (2) Put the prepared slurry into the reactor for esterification reaction; (3) After the esterification reaction, add trimellitic anhydride to the system for polycondensation reaction, discharge and pelletize after the polymerization reaction is completed, Obtaining polyester chips; (4) Putting the obtained polyester chips into a vacuum drum for solid-phase viscosity-increasing reaction to obtain finished polyester for foaming. The invention has the advantage of making the prepared polyester have higher melt strength and melt elasticity.

Description

technical field [0001] The invention relates to a method for preparing polyester; in particular, it relates to a method for preparing polyester for foaming. Background technique [0002] Polyester has been widely used in fiber, packaging and other fields due to its excellent mechanical properties, thermal properties, electrical properties, chemical properties and environmental properties. However, ordinary polyester has the characteristics of low melt strength and low melt elasticity. During the processing of polyester melt, there is obvious shear thinning phenomenon, and this characteristic is different from that of polymers with better foaming ability. The requirements are just the opposite. Therefore, in order to prepare foam products made of polyester, the melt strength and melt elasticity of the raw polyester must be improved. [0003] At present, there are mainly two methods to improve the melt strength and melt elasticity of polyester: 1. Simply adopt the method of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/86C08G63/80C08K3/32C08K5/521C08K13/02
Inventor 朱振达宗建平陈旭陈小雷徐梅
Owner CHINA RESOURCES PACKAGING MATERIALS CO LTD