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A kind of polyester foam beads and polyester foam beads molded body and preparation method thereof

A technology of foamed beads and moldings, which is applied in the field of polyester foamed beads and polyester foamed beads and their preparation, and can solve the problem of inability to obtain PET foamed beads with complete shapes and damage to PET materials, etc. problem, to achieve the effect of reducing hydrolysis and thermo-oxidative degradation, increasing the transportation radius, and good heat resistance

Active Publication Date: 2022-05-24
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 polyester foam beads molded body and preparation method thereof
  • A kind of polyester foam beads and polyester foam beads molded body and preparation method thereof
  • A kind of polyester foam beads and polyester foam beads molded body and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The preparation method of the polyester foam beads described in this embodiment comprises the following steps:

[0054] S1. 100 parts by weight of PET particles (intrinsic viscosity is 0.9 dl / g) and 0.5 parts by weight of antioxidant are dried, premixed, and continuously extruded and diced by twin-screw to obtain polyester particles;

[0055] S2. Immerse polyester particles in anhydrous high pressure fluid with high pressure CO 2 fluid to obtain impregnated polyester particles with a high-pressure fluid content of 5.0% and a crystallinity of 0%;

[0056] S3. Use liquid nitrogen to quickly freeze the impregnated polyester particles, the temperature of the cooling cavity is minus 60 degrees, and then store the impregnated polyester particles after freezing and air locking in an environment of minus 20 degrees for 1 day to obtain a freezing lock. air-locked polyester particles; the high-pressure fluid content in the frozen air-locked polyester particles is 5.0%, and the m...

Embodiment 2

[0063] The preparation method of the polyester foam beads described in this embodiment comprises the following steps:

[0064] S1. 100 parts by weight of PET particles (intrinsic viscosity is 1.1 dl / g) and 0.5 parts by weight of antioxidant are dried, premixed, and continuously extruded and diced by twin-screw to obtain polyester particles;

[0065] S2. Immerse the polyester microparticles in anhydrous high pressure fluid with high pressure CO 2 fluid to obtain impregnated polyester particles with a high-pressure fluid content of 9.0% and a crystallinity of 5%;

[0066] S3. Use liquid nitrogen to quickly freeze the impregnated polyester particles, the temperature of the cooling cavity is minus 60 degrees, and then store the impregnated polyester particles after freezing and air locking in an environment of minus 20 degrees for 7 days to obtain a freezing lock. Air-locked polyester particles; the high-pressure fluid content in the frozen air-locked polyester particles is 8.2%,...

Embodiment 3

[0073] The preparation method of the polyester foam beads described in this embodiment comprises the following steps:

[0074] S1. 100 parts by weight of PET particles (intrinsic viscosity is 1.2 dl / g) and 0.5 parts by weight of antioxidant are dried, premixed, and continuously extruded and pelletized by twin screws to obtain polyester particles;

[0075] S2. Immerse the polyester microparticles in anhydrous high pressure fluid with high pressure CO 2 fluid to obtain impregnated polyester particles with a high-pressure fluid content of 5.0% and a crystallinity of 15%;

[0076] S3. Use liquid nitrogen to quickly freeze the impregnated polyester particles, the temperature of the cooling cavity is minus 60 degrees, and then store the impregnated polyester particles after freezing and air-locking in an environment of minus 20 degrees for 15 days to obtain a freezer lock. Air-locked polyester particles; the high-pressure fluid content in the frozen air-locked polyester particles is ...

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Abstract

The invention discloses a polyester foamed bead and a preparation method thereof. The preparation method comprises the following steps: S1. granulating the raw material of the polyester foamed bead through an extruder to obtain polyester microparticles; S2. The polyester particles are impregnated with high-pressure fluid a in an anhydrous high-pressure container to obtain impregnated polyester particles; S3. freezing and storing the impregnated polyester particles in an environment below 0°C to obtain frozen gas-locked polyester particles ; S4. Carrying out heating and foaming treatment on the frozen gas-locking polyester particles. The polyester foamed beads of the invention have a crystallinity of 15-45%, a density of 20-500g / L, and excellent mechanical properties and heat resistance. The invention also discloses a polyester foamed bead molded body and a preparation method thereof. The polyester foamed bead molded body of the present invention can be heat-resistant above 150 degrees through radio frequency molding, and the compressive strength of 50% deformation can reach Up to 3-10MPa.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polyester foamed bead and a polyester foamed bead molded body and a preparation method thereof. Background technique [0002] Polyethylene terephthalate (PET) is the thermoplastic polyester with the largest output and the cheapest price. It has a significant cost performance and is widely used in three fields: synthetic fibers, polyester bottles, and biaxially oriented films. PET foam materials such as PET continuous extruded foam board, PET continuous extruded foam sheet, etc. have light weight, high specific strength, excellent heat resistance and good electrical insulation, and have been used in wind power generation, automobiles, high-speed rail, construction, Food packaging and other fields to achieve large-scale applications. [0003] Polymer foam beads such as EPS, EPP, EPE, and ETPU are bead-shaped polymer foam materials with high expansion ratios. They can b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/18C08J9/12C08J9/228C08L67/02
CPCC08J9/18C08J9/122C08J9/228C08J2367/02
Inventor 翟文涛
Owner SUN YAT SEN UNIV
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