Preparation method of supercritical micro-foaming high-light plastic and plastic-based composite material and supercritical micro-foaming high-light plastic or plastic-based composite material prepared through preparation method

A composite material and plastic-based technology, applied in the field of polymer material preparation, can solve problems such as difficult control, reduced bubble density and uniformity, roughness, etc., and achieve simple operation and process control, controllable density, and small cells Effect

Pending Publication Date: 2017-07-28
段辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface of the material obtained by the above method is prone to flow marks, air marks, foaming and roughness, etc., and the surface finish is not high
Some scholars and patents have proposed methods such as

Method used

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  • Preparation method of supercritical micro-foaming high-light plastic and plastic-based composite material and supercritical micro-foaming high-light plastic or plastic-based composite material prepared through preparation method
  • Preparation method of supercritical micro-foaming high-light plastic and plastic-based composite material and supercritical micro-foaming high-light plastic or plastic-based composite material prepared through preparation method
  • Preparation method of supercritical micro-foaming high-light plastic and plastic-based composite material and supercritical micro-foaming high-light plastic or plastic-based composite material prepared through preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A method for preparing supercritical micro-foaming high-gloss plastics and plastic-based composite materials, comprising the following steps:

[0040] (1) Preparation of hot-melt adhesive: Polypropylene is heated to melt, and under the action of screw shear, the hot-melt adhesive is formed through plasticization, melting and homogenization;

[0041] (2) Preparation of a single-phase melt: at the end of the screw, inject supercritical foaming gas nitrogen to dissolve it into the hot melt adhesive obtained in step (1) to form a single-phase melt;

[0042] (3) Injection molding: quickly inject the single-phase melt obtained in step (2) into the injection mold with high-temperature steam, the temperature of the high-temperature steam is 30°C higher than that of the single-phase melt obtained in step (2), and the injection The temperature of model is identical with the temperature of the single-phase melt that step (2) obtains;

[0043] (4) Cooling molding: After the inject...

Embodiment 2

[0047] A method for preparing supercritical micro-foaming high-gloss plastics and plastic-based composite materials, comprising the following steps:

[0048] (1) Preparation of hot-melt adhesive: heat polyvinyl chloride to melt, and under the shear action of the screw, form hot-melt adhesive through plasticization, melting and homogenization reactions;

[0049] (2) Preparation of a single-phase melt: at the end of the screw, inject supercritical foaming gas carbon dioxide gas to dissolve it into the hot melt adhesive obtained in step (1) to form a single-phase melt;

[0050] (3) Injection molding: quickly inject the single-phase melt obtained in step (2) into the injection mold with high-temperature steam, the temperature of the high-temperature steam is 15°C higher than that of the single-phase melt obtained in step (2), and the injection The temperature of model is identical with the temperature of the single-phase melt that step (2) obtains;

[0051] (4) Cooling molding: A...

Embodiment 3

[0055] A method for preparing supercritical micro-foaming high-gloss plastics and plastic-based composite materials, comprising the following steps:

[0056] (1) Preparation of hot melt adhesive: the composite material of polyphenylene sulfide and titanium dioxide is heated to melting, and under the shearing action of the screw, the hot melt adhesive is formed through plasticization, melting and homogenization;

[0057] (2) Preparation of single-phase melt: At the end of the screw, inject a mixture of supercritical foaming gas nitrogen and carbon dioxide gas to dissolve it into the hot melt adhesive obtained in step (1) to form a single-phase melt ;

[0058] (3) Injection molding: quickly inject the single-phase melt obtained in step (2) into the injection mold with high-temperature steam, the temperature of the high-temperature steam is 45°C higher than that of the single-phase melt obtained in step (2), and the injection The temperature of model is identical with the temper...

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Abstract

The invention relates to the technical field of preparation of high polymer materials and provides a preparation method of supercritical micro-foaming high-light plastic and a plastic-based composite material and the supercritical micro-foaming high-light plastic or the plastic-based composite material prepared through the preparation method for solving the problem that the bubble hole size and bubble density of plastic and a plastic-based composite material thereof are difficult to control. The method comprises the following steps that 1, a hot melt adhesive is prepared, particularly, the plastic or the plastic-based composite material is heated to be molten, and the hot melt adhesive is formed under the shearing effect of a screw rod; 2, a single-phase melt is prepared, particularly, supercritical foaming gas is injected into the end of the screw rod to be mixed into the hot melt adhesive obtained in the step 1, and the single-phase melt is formed; 3, injection molding is carried out, and particularly high-temperature steam is adopted for rapidly injecting the single-phase melt obtained in the step 2 into an injection model; and 4, cooling molding is carried out, particularly, a condensing agent is adopted for rapidly reducing the temperature of the injection model in the step 3, and therefore the high-light plastic or the plastic-based composite material with high-density micro holes inside is obtained.

Description

technical field [0001] The invention relates to the technical field of polymer material preparation, and specifically provides a method for preparing supercritical micro-foamed high-gloss plastics and plastic-based composite materials and the plastic or plastic-based composite materials. Background technique [0002] There are many plastic molding methods, such as extrusion, injection molding, etc. The foaming methods include chemical foaming method and physical foaming method. Chemical foaming is to add chemical foaming agents such as azo compounds, sulfonyl hydrazine compounds, nitroso compounds and sodium bicarbonate to the raw materials. The cell size and density are uneven, difficult to control, and do not meet environmental protection requirements. Physical foaming, such as using supercritical nitrogen or carbon dioxide, can control the size of the cells to the micron level, and the density can reach millions of cells per cubic centimeter. However, the surface of the ...

Claims

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Application Information

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IPC IPC(8): B29C44/02B29C44/42B29C44/60
CPCB29C44/02B29C44/42B29C44/60
Inventor 段辉
Owner 段辉
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