Thermoplastic polymer foam bead and method for preparing same

A technology of thermoplastic polymers and expanded beads, applied in the direction of climate sustainability, sustainable manufacturing/processing, chemical industry, etc., can solve the problem of increasing the post-processing separation and drying process, affecting the smooth discharge of solid materials, and not being able to complete smoothly Foaming and other problems, to achieve the effect of improving foaming ratio and mechanical properties, short heating time, and not easy to agglomerate

Inactive Publication Date: 2018-08-17
常州晟润新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the high-pressure reactor process, due to the poor heat transfer of granular polymer particles in the high-pressure reactor, it will cause uneven heating inside and outside, and it is difficult to stir the material evenly in the common stirring form; The superheated particles on the inner wall are turned to the center, but this stirring often forms a projection on the bottom, which affects the smooth discharge of solid materials
Therefore, in the high-pressure reactor foaming process, the effect of uniform temperat

Method used

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  • Thermoplastic polymer foam bead and method for preparing same
  • Thermoplastic polymer foam bead and method for preparing same
  • Thermoplastic polymer foam bead and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 100 parts of foaming grade polypropylene, resin MI at 3g / 10min (2.16kg weight at 190°C), 1.5 parts of nucleating agent (talcum powder), 0.1 part of viscosity modifier (polyethylene glycol diglycidylglycerol) ether), 8 parts of cell stabilizer (sodium alkyl sulfonate), mixed and extruded by a twin-screw extruder, cut into particles with a particle diameter of 0.5mm, and the weight of 100 particles of particles is 0.4g, and the resin particles are dried for subsequent use As particles to be expanded.

[0044] The preparation method of polypropylene foam beads is as follows:

[0045] (1) Place the granules to be expanded in a high-pressure reactor A, keep the constant temperature at 80°C, replace the air in the kettle, fill it with carbon dioxide to a supercritical state, control the pressure in the kettle at 15MPa, and infiltrate for 15 minutes under pressure;

[0046] (2) Transport the materials in the high-pressure reactor A to the reactor B through a magnetically ...

Embodiment 2

[0050] Weigh 100 parts of foaming grade polypropylene, resin MI at 3g / 10min (2.16kg weight at 190°C), 2 parts of nucleating agent (calcium carbonate), 6 parts of viscosity regulator (1,4-butanediol di Glycidyl ether), 8 parts of cell stabilizer (sodium alkylaryl sulfonate), mixed and extruded by a twin-screw extruder, cut into particles with a particle diameter of 1.5mm, and the weight of 100 particles of particles is 1.0g , the resin granules are dried and used as the granules to be expanded.

[0051] The preparation method of polypropylene foam beads is as follows:

[0052] (1) Put the granules to be expanded in the autoclave A, keep the constant temperature at 120°C, replace the air in the autoclave, fill it with carbon dioxide to a supercritical state, control the pressure in the autoclave at 7.3MPa, and infiltrate for 60 minutes under pressure.

[0053] (2) Transport the materials in the high-pressure reactor A to the reactor B through a magnetic-sealed stirring device. ...

Embodiment 3

[0057] Weigh 100 parts of foaming grade polyethylene terephthalate, the IV value is 1.10-1.40dL / g (using Ubbelohde viscometer at 30°C with phenol and 1,1,2,2-tetrachloroethylene 6:4 mixed solvent of alkane to detect), 5 parts of nucleating agent (kaolin), 8 parts of viscosity modifier (glycerol diglycidyl ether), 2 parts of cell stabilizer (alkylphenol polyether), through The twin-screw extruder is mixed and extruded, cut into particles with a particle diameter of 1.5mm, and the weight of one hundred particles is 1.0g, and the resin particles are dried and used as particles to be expanded.

[0058] The preparation method of polyethylene terephthalate expanded beads is as follows:

[0059] (1) Place the particles to be expanded in the autoclave A, keep the constant temperature at 180°C, replace the air in the autoclave, fill it with carbon dioxide to a supercritical state, control the pressure in the autoclave at 12MPa, and infiltrate for 180min under pressure.

[0060] (2) Tr...

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Abstract

The invention discloses a thermoplastic polymer foam bead and a method for preparing the same. The method includes 1), extruding and granulating foam-grade thermoplastic polymer resin compositions toobtain to-be-foamed particles; 2), placing the to-be-foamed particles constant-temperature high-pressure reaction kettles A, filling the constant-temperature high-pressure reaction kettles A with supercritical fluid and carrying out permeating and swelling to reach diffusion balance so as to form polymer-supercritical fluid homogenous systems; 3), transferring balanced to-be-foamed particles intohigh-pressure reaction kettles B by the aid of magnetic sealed stirring devices under the constant pressures; 4), unloading materials in the high-pressure reaction kettles B by the aid of quick opening ball valves under the pressures and foaming and expanding polymer particles to obtain the thermoplastic polymer foam bead. The pore diameters of the thermoplastic polymer foam bead range from 30 micrometers to 50 micrometers, and the rate of the thermoplastic polymer foam bead ranges from 10 times to 60 times.

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. The traditional bead foaming technology is often prepared by the high-pressure reactor method. The foaming process often uses organic solvents, chlorofluorocarbons and other foaming agents, which seriously pollute the environment and products. [0003] Supercritical fluid (SCF, supercritical fluid) refers to a fluid above the critical temperature and above the critical pressure. Because its viscosity and diffusion coefficient are close to those of gas, and its density and solvation ability are close to that of liquid, the advantages of fast diffusion rate and high solubility of supercritical fluid i...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L67/02C08L75/04C08J9/18
CPCC08J9/18C08J2323/12C08J2367/02C08J2375/04Y02P20/10Y02P20/50
Inventor 李巍徐强于民栋顾唯开
Owner 常州晟润新材料科技有限公司
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