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Process for preparing expanded product of thermoplastic resin

A technology for thermoplastic resins and foamed products, applied in the field of preparing thermoplastic resin foamed products, can solve the problems of poor appearance, mechanical properties, barrier properties, poor foaming ratio, uneven size distribution, fast diffusion speed, etc., and achieve good physical properties. Mechanical properties, effective cell diameter, high foaming ratio

Inactive Publication Date: 2007-09-12
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these inert gases have poor affinity with thermoplastic resins, low solubility in resins, and they diffuse quickly in polymers, which makes foamed products have large cell sizes and uneven size distribution and low cell density. Quantity, resulting in deterioration of appearance, mechanical properties, barrier properties, expansion ratio, etc.

Method used

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  • Process for preparing expanded product of thermoplastic resin
  • Process for preparing expanded product of thermoplastic resin
  • Process for preparing expanded product of thermoplastic resin

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The preparation of embodiment 1, PMMA foamed product

[0030] The vacuum-dried polymethyl methacrylate (PMMA) was melted and pressed at 200° C., and quenched in cold water to prepare a 1 mm thick sample.

[0031] The above PMMA sample was placed in an autoclave, and 20°C / 12MPa CO 2 After 6 hours of constant temperature and pressure, the sample was taken out from the autoclave, and foamed in a water bath and a water bath with ultrasonic waves applied (ultrasonic power is 100W, ultrasonic frequency is 20kHz), the foaming temperature is 80°C, and the foaming time is 20s.

[0032] Figure 1A is an electron micrograph of the PMMA product section without ultrasonic waves, and Figure 1B is an electron microscopic photo of the PMMA product section with ultrasonic waves applied. The results show that after the ultrasonic waves are applied, the foaming ratio of the foamed PMMA increases from 2.3 without ultrasonic waves. to 4.6, the cell diameter is reduced from 14.0 μm to 4.2 μ...

Embodiment 2

[0033] Embodiment 2, the preparation of PS foamed product

[0034] The vacuum-dried polystyrene (PS) was heated to 200° C., kept for 3 minutes, and quenched in cold water to prepare a 1 mm thick sample.

[0035] The above PS sample was placed in an autoclave, and 40°C / 8MPa CO 2 After 6 hours of constant temperature and pressure, the sample was taken out of the autoclave, and foamed in a water bath and a water bath with ultrasonic waves (ultrasonic power 200W, ultrasonic frequency 20kHz), the foaming temperature was 80°C, and the foaming time was 20s.

[0036] Figure 2A is an electron micrograph of the cross-section of PS products without ultrasonic waves, and Figure 2B is an electron microscopic photograph of the cross-sections of PS products with ultrasonic waves applied. The results show that after ultrasonic waves are applied, the foaming ratio of the foamed PS increases from 1.3 to 2.4, cell density from 7.5×10 10 cells / cm 3 Increased to 2.3×10 11 cells / cm 3 , the cel...

Embodiment 3

[0037] Embodiment 3, the preparation of PC foam product

[0038] The vacuum-dried polycarbonate (PC) was melted and pressed at 260° C., and quenched in cold water to prepare a 1 mm thick sample.

[0039] Put the above PC sample into an autoclave, and pass through CO at 20°C / 20MPa 2 After 10 hours of constant temperature and pressure, the sample was taken out from the autoclave, and foamed in a glycerin bath and a glycerin bath with ultrasonic waves (ultrasonic power 100W, ultrasonic frequency 20kHz), the foaming temperature was 100 ° C, and the foaming time was 30s.

[0040] Figure 3A is an electron micrograph of the PC product section without ultrasonic waves, and Figure 3B is an electron microscopic photo of the PC product section with ultrasonic waves applied. The results show that after ultrasonic waves are applied, the foaming ratio of the foamed PC increases from 1.1 without ultrasonic waves to 1.7, the cell diameter is reduced from 2.4 μm to 2.1 μm, and the cell densi...

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Abstract

The invention discloses a method for preparing a kind of thermoplastic resin foam by using ultrasonic technology. The method includes following steps: 1) it put the thermoplastic resin samples into the autoclave, then it access to the high-pressure fluid for constant temperature and pressure. 2) it release the high-pressure fluid and take out the samples form the autoclave, then it puts the samples in the liquid medium of ultrasonic environment for foaming. After that it rapidly quenches the foam samples to form the cell structure of stereotypes to achieve the products. In the invention, the method improves the nuclear density of the thermoplastic resin foam and promotes the process of nucleation and gas nuclear growth.

Description

technical field [0001] The invention relates to a method for preparing thermoplastic resin foamed products, in particular to a method for preparing thermoplastic resin foamed products by using ultrasonic waves. Background technique [0002] Thermoplastic resin foamed products use resin as the basic component and contain a large number of cells. Compared with pure resin, it has many excellent properties, such as light weight, high specific strength, ability to absorb impact load, good heat insulation and sound insulation performance, etc. Therefore, it is widely used in packaging, daily necessities, construction, automobile, biomedical, aerospace and other fields. For example, soft foam plastics with good elasticity have been widely used in various cushions, pads, pillow cores, clothing, etc.; foamed products have good thermal insulation performance and can be used as various thermal insulation and heat insulation pads; Foam products are lightweight and have the ability to ...

Claims

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Application Information

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IPC IPC(8): C08J9/00C08J9/12C08L25/06C08L33/12C08L27/06C08L69/00C08L67/02C08L67/04C08L77/00C08L23/00
Inventor 余坚翟文涛何嘉松
Owner INST OF CHEM CHINESE ACAD OF SCI
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