Method for preparing thermoplastic polymer foamed beads by clean waterless process

A thermoplastic polymer and foamed bead technology, which is applied in the chemical industry, climate sustainability, sustainable manufacturing/processing, etc., can solve the problems of easy shrinkage and deformation of foamed bead products, open cell structure, high open cell rate, etc. problems, to achieve the effect of good uniformity of cell diameter, clean process and high heating efficiency

Inactive Publication Date: 2019-01-25
GUANGDONG BENDI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Continuous extrusion foaming is used to make polymer foamed beads. The main problem is that the polymer in the extrusion foaming process is in a molten state, which easily causes the bubbles inside the air beads to form an open-cell structure, and the opening rate of the bubbles is relatively high. , resulting in easy shrinkage and deformation of the foamed bead product, which is likely to cause product defects in the subsequent molding process

Method used

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  • Method for preparing thermoplastic polymer foamed beads by clean waterless process

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Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing thermoplastic polymer foam beads by a clean and water-free process, comprising a reciprocating booster pump, an air supply valve, a fluidized bed, and a feed inlet valve and a discharge outlet valve connected to the fluidized bed. The reciprocating booster pump is connected to the fluidized bed through an insulation pipeline, and the air supply valve is connected to the insulation pipeline, and the fluidized bed includes a vulcanization kettle body, an air distribution plate, a ventilation net, and a heating interlayer;

[0036] Concrete preparation steps are as follows:

[0037] 1) Open the inlet valve of the fluidized bed, put an appropriate amount of polymer particles into the fluidized bed, and then close the valve without adding water medium and anti-sticking release agent;

[0038] 2) Open the gas supply valve of the reciprocating booster pump, feed foaming agent gas into the vulcanization kettle, adjust the foaming pressure to 30MPa, close ...

Embodiment 2

[0043] A method for preparing thermoplastic polymer foam beads by a clean and water-free process, comprising a reciprocating booster pump, an air supply valve, a fluidized bed, and a feed inlet valve and a discharge outlet valve connected to the fluidized bed. The reciprocating booster pump is connected to the fluidized bed through an insulation pipeline, and the air supply valve is connected to the insulation pipeline, and the fluidized bed includes a vulcanization kettle body, an air distribution plate, a ventilation net, and a heating interlayer;

[0044] Concrete preparation steps are as follows:

[0045] 1) Open the inlet valve of the fluidized bed, put an appropriate amount of polymer particles into the fluidized bed, and then close the valve without adding water medium and anti-sticking release agent;

[0046] 2) Open the gas supply valve of the reciprocating booster pump, feed foaming agent gas into the vulcanization kettle, adjust the foaming pressure to 30MPa, close ...

Embodiment 3

[0051] A method for preparing thermoplastic polymer foam beads by a clean and water-free process, comprising a reciprocating booster pump, an air supply valve, a fluidized bed, and a feed inlet valve and a discharge outlet valve connected to the fluidized bed. The reciprocating booster pump is connected to the fluidized bed through an insulation pipeline, and the air supply valve is connected to the insulation pipeline, and the fluidized bed includes a vulcanization kettle body, an air distribution plate, a ventilation net, and a heating interlayer;

[0052] Concrete preparation steps are as follows:

[0053] 1) Open the inlet valve of the fluidized bed, put an appropriate amount of polymer particles into the fluidized bed, and then close the valve without adding water medium and anti-sticking release agent;

[0054] 2) Open the gas supply valve of the reciprocating booster pump, feed foaming agent gas into the vulcanization kettle, adjust the foaming pressure to 20MPa, close ...

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Abstract

The invention provides a method for preparing thermoplastic polymer foamed beads by a clean waterless process, the method comprises the following preparation steps: a feed inlet valve of a vulcanization kettle is opened, an appropriate amount of polymer particles are poured into the vulcanization kettle, the feed inlet valve is then closed, and circulation is formed in the vulcanization kettle; agas replenishing valve of a reciprocating booster pump is opened, foaming agent gas is injected into the vulcanization kettle, foaming pressure is regulated to 5MPa to 30MPa, and the gas replenishingvalve is closed; when the polymer particles are completely in a fluidized state, the temperature of the vulcanization kettle is increased to foaming temperature; temperature and pressure are kept for10 to 30 minutes, a discharge outlet valve is opened, the pressure release rate is 1MPa/s to 1000MPa/s, the gas carries beads to get out of a fluidized bed, and thereby foamed polymer beads are obtained. The method utilizes the high-pressure fluidized bed to carry out preparation and directly utilizes a supercritical fluid foaming technique, the demand on heat quantity is low, the cost is low, thecontrollability is high, moreover, the efficiency of production is high, the micropores of the prepared foamed beads are fine and dense, the diameter uniformity of the cells is good, and overall safety and cleanliness in the process of production are high.

Description

technical field [0001] The invention relates to the technical field of preparation of thermoplastic polymer foaming materials, in particular to a method for preparing thermoplastic polymer foaming beads by a clean anhydrous process. Background technique [0002] Thermoplastic polymer foamed beads not only have a high expansion ratio, but also can be molded into various products with complex shapes and high dimensional accuracy, which greatly expands the application field of thermoplastic polymer foamed materials. Thermoplastic polymer foamed beads The use of granular products in shockproof packaging, sports shoes cushioning, lightweight automobiles, children's toys, sports equipment, water buoys and other fields is increasing. [0003] At present, the thermoplastic polymer bead foaming process is divided into two categories: batch-type kettle pressure foaming method and continuous extrusion foaming method. The process conditions of the intermittent kettle pressure foaming m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/16B29C44/34B29C44/02C08L23/12C08L23/06C08L59/00C08L77/00C08L55/02C08L25/06C08L27/06C08L33/12C08L69/00
CPCB29C44/02B29C44/3461C08J9/16C08J2323/06C08J2323/12C08J2325/06C08J2327/06C08J2333/12C08J2355/02C08J2359/00C08J2369/00C08J2377/00Y02P20/10
Inventor 冯云平
Owner GUANGDONG BENDI NEW MATERIAL TECH
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