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A kind of polyester foam beads and its semi-continuous preparation method and water vapor molding method

An expanded bead, semi-continuous technology, applied in the coating and other directions, can solve the problems of destroying the original geometric shape of PET material, unable to obtain PET expanded beads with complete shape, etc., to inhibit the phenomenon of hydrolysis and thermal oxygen degradation, inhibit the Desorption escape, good mechanical properties

Active Publication Date: 2022-03-22
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature melting process will destroy the original geometry of the PET material, and PET foam beads with complete shape and independent particles cannot be obtained by this method.

Method used

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  • A kind of polyester foam beads and its semi-continuous preparation method and water vapor molding method
  • A kind of polyester foam beads and its semi-continuous preparation method and water vapor molding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The embodiment of the semi-continuous preparation method of polyester expanded beads of the present invention and steam forming method comprises the following steps:

[0072] (1) 100 parts of PET copolyester particles (the third monomer in the copolyester is succinic acid, and the content of the third monomer is 10%), 0.5 part of antioxidant and 0.5 part of hydrolysis resistance agent After successive drying, pre-mixing, twin-screw continuous extrusion and granulation, the precursor polyester particles are obtained;

[0073] (2) Put the precursor polyester particles obtained in step (1) into an anhydrous and filled with CO 2 The impregnated polyester particles with a high-pressure fluid content of 7% and a crystallinity of 5% were obtained by impregnating the fluid in a high-pressure container, and then the impregnated polyester particles were moved into the cooling chamber and subjected to rapid freezing and air-locking treatment with liquid nitrogen. At this time, the...

Embodiment 2

[0081] The embodiment of the semi-continuous preparation method of polyester expanded beads of the present invention and steam forming method comprises the following steps:

[0082] (1) 100 parts of PET copolyester particles (the third monomer in the copolyester is hexanediol, and the content of the third monomer is 5%), 0.5 part of antioxidant and 0.5 part of hydrolysis-resistant agent After successive drying, pre-mixing, twin-screw continuous extrusion and granulation, the precursor polyester particles are obtained;

[0083] (2) Put the precursor polyester particles obtained in step (1) into an anhydrous and filled with CO 2 The impregnated polyester particles with a high-pressure fluid content of 8% and a crystallinity of 8% were obtained by impregnating the fluid in a high-pressure container, and then the impregnated polyester particles were moved into the cooling chamber and quickly frozen and air-locked with liquid nitrogen. At this time, the The temperature is -60°C, a...

Embodiment 3

[0091] The embodiment of the semi-continuous preparation method of polyester expanded beads of the present invention and steam forming method comprises the following steps:

[0092] (1) 60 parts of PET (intrinsic viscosity is 1.0dl / g), 40 parts of PET copolyester particles (the third monomer in the copolyester is succinic acid, and the content of the third monomer is 10% ), 0.5 part of antioxidant and 0.5 part of hydrolysis-resistant agent are sequentially dried, pre-mixed, twin-screw continuous extruded and pelletized to obtain precursor polyester particles;

[0093] (2) Put the precursor polyester particles obtained in step (1) into an anhydrous and filled with CO 2 The impregnated polyester particles with a high-pressure fluid content of 6% and a crystallinity of 5% were obtained by impregnating the fluid in a high-pressure container, and then the impregnated polyester particles were moved into the cooling chamber and quickly frozen and air-locked with liquid nitrogen. At t...

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Abstract

The invention discloses a polyester foamed bead, a semi-continuous preparation method thereof and a steam molding method, and relates to the field of polymer foamed beads. The preparation method of the present invention controls the solubility content of the high-pressure fluid in the polyester particles, and then performs rapid freezing and air-locking treatment on the material at a specific temperature to inhibit the desorption and escape of the high-pressure fluid, and the obtained impregnated particles can be stored at low temperature for a long time Or carry out long-distance transportation, the transportation and storage costs are reduced, and at the same time, the heating and foaming can be performed stably; the whole process is carried out in an anhydrous environment, which can effectively inhibit the hydrolysis and thermo-oxidative degradation of polyester. The invention also discloses the polyester foamed beads prepared by the method, the polyester foamed beads are spherical or ellipsoidal, the closed cell structure accounts for 100%, the cell size is 1-300 μm, and the crystallinity is 1-15%, density 20-200g / L, good mechanical properties. The invention also discloses a steam forming method of the polyester foamed beads.

Description

technical field [0001] The invention relates to the field of polymer foamed beads, in particular to a polyester foamed bead, a semi-continuous preparation method and a water vapor forming method thereof. Background technique [0002] Polymer foam beads (such as EPS, EPP, EPE, ETPU, etc.) are bead-shaped polymer foam materials. This material has a high expansion ratio and can be formed into low-density, ultra-low-density complex special-shaped beads by steam molding. Components are mainly used in cache packaging, automotive lightweight parts, building insulation, cold chain logistics, sports protection, home furnishing, toys and other fields. However, foamed beads such as EPS, EPE, EPP, and ETPU have low heat resistance and are difficult to apply to environments with temperatures higher than 120°C. [0003] PET is a semi-crystalline polymer with a glass transition temperature of 60-75°C and a melting point of 240-260°C. PET foam beads and their moldings can be used in enviro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B9/06B29B9/12B29B9/16B29C44/02B29C44/44B29C44/34B29C44/60B29K67/00
CPCB29B9/06B29B9/065B29B9/12B29B9/16B29C44/02B29C44/445B29C44/3426B29C44/60B29B2009/125B29K2067/003
Inventor 翟文涛
Owner SUN YAT SEN UNIV
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