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Method of preparing transparent thermoplastic resin bubble body

A thermoplastic resin and transparent technology is applied in the field of transparent thermoplastic resin bubbles and the preparation of transparent thermoplastic resin bubbles.

Pending Publication Date: 2021-01-29
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, most of the foam surface obtained after one-time injection molding by conventional physical foaming and chemical foaming usually have appearance defects such as flow lines and streamlines.

Method used

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  • Method of preparing transparent thermoplastic resin bubble body
  • Method of preparing transparent thermoplastic resin bubble body
  • Method of preparing transparent thermoplastic resin bubble body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109]Take Makrolon 2605, a part of which maintains a moisture content of 0.15% by weight, as the inner core material, and a part of it is placed in a desiccant dryer and dried at 110°C for 5 hours. The measured water content is 0.01% as the outer shell material.

[0110]The inner core raw material particles and the outer shell raw material particles are respectively put into the barrels corresponding to the two injection molding units of the double injection injection molding. The barrel of the injection core (hereinafter referred to as the core barrel) and the barrel of the injection shell (hereinafter referred to as the shell barrel) are heated.

[0111]The core of the cavity used for inner core molding (hereinafter referred to as the first cavity core) and the core of the cavity used for outer shell molding (hereinafter referred to as the second cavity core) are heated, and set Set other relevant process parameters.

[0112]Table 1 main process parameters

[0113] Inner core shell Melti...

Embodiment 2

[0126]Example 2 was performed with reference to Example 1, except that the injection volume of the inner core was set to 96%.

[0127]Statistics on the number and average size of the inner core bubbles are shown in Table 2.

[0128]When the injection volume of the inner core is increased from 90% of Example 1 to 96%, the number of bubbles is less than that obtained in Example 1.

Embodiment 3

[0130]Example 3 was performed with reference to Example 1, except that the inner core injection holding pressure was set to 500 bar.

[0131]Statistics on the number and average size of the inner core bubbles are shown in Table 2.

[0132]When the inner core injection holding pressure is increased from 0 bar to 500 bar in Example 1, and the holding pressure is 5 seconds, the number of bubbles is less than that obtained in Example 1.

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Abstract

The invention relates to a method for preparing a transparent thermoplastic resin bubble body and the transparent thermoplastic resin bubble body prepared through the method. The method comprises thefollowing steps that I) injection molding is carried out on first transparent thermoplastic resin to form an inner core with a bubble; and II) injection molding is carried out on second transparent thermoplastic resin around the inner core to form a shell without the bubble to obtain the transparent thermoplastic resin bubble body. Compared with an existing physical foaming method and an existingchemical foaming method, the method is simple in process, does not need to additionally invest physical foaming equipment or add a chemical foaming agent, and reduces equipment investment and production procedures, and the prepared transparent thermoplastic resin bubble body has no defects such as flow lines and / or streamlines on the surface.

Description

Technical field[0001]The invention belongs to the field of plastic product processing. Specifically, the present invention relates to a method of preparing a transparent thermoplastic resin bubble and a transparent thermoplastic resin bubble prepared thereby.Background technique[0002]There are bubbles inside the transparent plastic foam, which is beautiful and beautiful, giving people a dreamlike visual impact. When light of different colors passes through the transparent plastic foam, it can exhibit different optical effects. For example, when the color of the light passing through the transparent plastic foam changes, the foam exhibits a colorful effect. In the current market, transparent polystyrene plastic (PS) spherical or stick-shaped objects with bubbles inside have been widely used in the handles and decorative strips of amusement game machines, which mainly use chemical foaming methods.[0003]Plastic foaming technology has been used for a long time, and the injection foaming...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00B29C45/14B29C45/26
CPCB29C45/00B29C45/14B29C45/26
Inventor 韩华何照元洪珂冯金
Owner COVESTRO DEUTSCHLAND AG