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A kind of thermoplastic polymer foam beads and preparation method thereof

A technology of thermoplastic polymers and foaming beads, which is applied in other household appliances, household appliances, household components, etc., can solve the problems of low foaming ratio, low heat resistance level, complicated process, etc., and achieve high foaming ratio Effect

Active Publication Date: 2019-07-26
青岛中诚高分子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional foamed beads such as expandable polystyrene (EPS), expandable polyethylene (EPE), expandable polyolefin (EPO), etc., can no longer meet the needs of high-performance fields due to their low heat resistance. application, and the traditional foaming process often uses organic solvents, chlorofluorocarbons and other foaming agents, which seriously pollute the environment and products
[0003] Disclosed in the prior art is a method using microwave heating to prepare expanded particles, adding microwave sensitizers (iron oxide, manganese oxide, zinc oxide, calcium oxide, etc.) Substituted hydrocarbons, ketones, alcohols, ethers, ethyl acetate, butyl acetate, butyl butyrate, acetone, ether, toluene, xylene, tetrahydrofuran, etc.) as foaming agents, it is difficult to achieve continuous foaming Precise control, low foaming ratio
The process is complicated and the process is not environmentally friendly, and the foaming effect is not good

Method used

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  • A kind of thermoplastic polymer foam beads and preparation method thereof
  • A kind of thermoplastic polymer foam beads and preparation method thereof
  • A kind of thermoplastic polymer foam beads and preparation method thereof

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Experimental program
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preparation example Construction

[0037] A thermoplastic polymer foamed bead of the present invention has a foaming ratio of 5-30 times, has a special core-shell structure, has a surface pore size of 100-500 μm, and an internal pore size of 10-100 μm; it is prepared by the following preparation method Obtained, this preparation method comprises the steps:

[0038] 1) extruding and granulating the foaming-grade thermoplastic polymer resin composition to make granules to be expanded with uniform shape and weight;

[0039] 2) Next, the polymer particles are placed in a high-pressure reactor at a constant temperature, filled with supercritical fluid for infiltration and swelling, to achieve diffusion equilibrium, and form a polymer-supercritical fluid homogeneous system;

[0040] 3) Then the pressure in the system is slowly released, and the swollen polymer particles are taken out and surface treated;

[0041] 4) Finally, through the microwave foaming drying tunnel, the frequency of the microwave drying tunnel is...

Embodiment 1

[0052] First, select 100 parts of general-purpose polypropylene, resin MI at 3g / 10min (2.16kg weight at 190°C), 0.8 parts of talcum powder as nucleating agent, 2 parts of cell stabilizer, and 3 parts of antistatic agent. The screw extruder is melt-extruded to produce particles with an average particle diameter of 1.5 mm and an average weight of 20 mg, and the resin particles are dried for later use.

[0053] Then, measure the particles and place them in a high-pressure reactor with a constant temperature above 32°C. After replacing the air in the kettle, fill it with carbon dioxide to a supercritical state, control the pressure in the kettle above 7.3MPa, and keep the pressure for 3 hours.

[0054] Next, slowly release the pressure of the supercritical fluid in the kettle to 0, control the pressure release rate below 20MPa / min, take out the resin particles, and immerse them in the pre-prepared one-thousandth to two-thousandth surfactant aqueous solution for surface treatment (...

Embodiment 2

[0057] First, select 100 parts of general-purpose polypropylene, resin MI at 3g / 10min (2.16kg weight at 190°C), 0.8 parts of talcum powder as nucleating agent, 2 parts of cell stabilizer, and 3 parts of antistatic agent. The screw extruder is melt-extruded to produce particles with an average particle diameter of 1.5 mm and an average weight of 20 mg, and the resin particles are dried for later use.

[0058] Then, measure the particles and place them in a high-pressure reactor with a constant temperature above 32°C. After replacing the air in the kettle, fill it with carbon dioxide to a supercritical state, control the pressure in the kettle above 7.3MPa, and keep the pressure for 3 hours.

[0059] Next, slowly release the pressure of the supercritical fluid in the kettle to 0, control the pressure release rate below 20MPa / min, take out the resin particles, and immerse them in the pre-prepared one-thousandth to two-thousandth surfactant aqueous solution for surface treatment ....

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Abstract

The invention discloses thermoplastic polymer foaming beads and a preparing method thereof. The preparing method comprises 1) extruding and pelleting a foaming grade thermoplastic polymer resin composite and preparing into particles to be foamed; 2) placing the polymer particles in a constant temperature high pressure reaction kettle, and injecting supercritical fluid for permeation and swelling to achieve diffusive equilibrium so as to form a polymer-supercritical fluid homogeneous system; 3) slowly releasing pressure in the system, taking out the swelled polymer particles and using an aqueous surfactant solution for surface treatment; and 4) by a microwave foaming drying tunnel with a frequency of 2450MHz or 915MHz, power of 2-20kW and foaming time of 30-300s, enabling the polymer particles to be foamed and expanded to form foaming beads. A foaming ratio of the prepared foaming beads is 5-30 times, the foaming beads have special core-shell structures, a surface layer aperture is 100-500 micrometers, and an internal aperture is 10-100 micrometers.

Description

technical field [0001] The invention belongs to the field of new materials, in particular to a thermoplastic polymer foamed bead and a preparation method thereof. Background technique [0002] Polymer foamed beads have the characteristics of light weight, cushioning, high toughness, and easy molding, and are widely used in packaging, sporting goods, automobiles and other fields. Traditional foamed beads such as expandable polystyrene (EPS), expandable polyethylene (EPE), expandable polyolefin (EPO), etc., can no longer meet the needs of high-performance fields due to their low heat resistance. application, and the traditional foaming process often uses organic solvents, chlorofluorocarbons and other foaming agents, which seriously pollute the environment and products. [0003] Disclosed in the prior art is a method using microwave heating to prepare expanded particles, adding microwave sensitizers (iron oxide, manganese oxide, zinc oxide, calcium oxide, etc.) Substituted h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C44/10B29B9/06B29C44/34B29C35/08C08J9/224C08J9/228C08L23/12C08L25/06C08L75/06C08L75/08B29K101/12
CPCB29B9/06B29C35/0805B29C44/105B29C44/3415B29C2035/0855B29K2101/12B29L2031/756C08J9/224C08J9/228C08J2323/12C08J2325/06C08J2375/06C08J2375/08
Inventor 韩世辉马明明韩世锋
Owner 青岛中诚高分子科技有限公司
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