Process for preparing expanded product of thermoplastic resin

A technology of thermoplastic resin and foamed products, which is applied in the field of preparing thermoplastic resin foamed products, can solve the problems of appearance, mechanical properties, barrier performance, poor foaming ratio, uneven size distribution, low number of cells, etc., to achieve good Physical and mechanical properties, effective cell diameter, and the effect of increasing nucleation density

Inactive Publication Date: 2009-10-14
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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
Comparison scheme
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 Electron micrograph of the section of PMMA products without ultrasonic waves, Figure 1B It is an electron micrograph of the section of PMMA products with ultrasonic waves applied. The results show that after ultrasonic waves are applied, the foaming ratio of the foamed PMMA increases from 2.3 to 4.6 without ultrasonic waves, and the cell diameter decreases from 14.0 μm to 4.2 μm. De...

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

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 It is an electron micrograph of the PC product section without ultrasonic waves, Figure 3B It is an electron microscope 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 to 1.7 without ultrasonic waves, the cell diameter decreases from 2.4 μm to 2.1 μm, and the cell de...

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Abstract

The invention discloses a method for preparing thermoplastic resin foamed products. The method for preparing thermoplastic foamed products by ultrasonic waves in the present invention comprises the following steps: 1) placing a thermoplastic resin sample in an autoclave, feeding a high-pressure fluid into the sample at constant temperature and pressure, so that the high-pressure fluid penetrates into the sample; 2) putting the high-pressure fluid into the sample; Release, take out the sample, put it into the liquid medium in the ultrasonic environment for foaming; quickly quench the foamed sample, make the cell structure finalize, and obtain the foamed product. The invention provides a method for solid-state foaming of polymers assisted by ultrasonic technology, which increases the nucleation density of cells in foamed thermoplastic resin products, and promotes the nucleation and gas nucleation growth during the foaming process of polymers, so that it can be conveniently and effectively A thermoplastic resin foamed product with small cell diameter and high expansion ratio is prepared. The method of the invention has the characteristics of simple process, no pollution and more effective method, and the prepared foaming material has better physical and mechanical properties.

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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Patent Type & Authority Patents(China)
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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