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A Closed-Cell Foam to Open-Cell Foam Conversion Method Based on Thermally Driven Shape Memory Effect

A technology of foam plastics and memory effect, which is applied in the field of foam plastic manufacturing, can solve the problems that the opening ratio and opening size cannot be well controlled, and achieve the effect of fast transformation process, low cost and easy detection

Active Publication Date: 2020-07-03
象山联华泡沫塑料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, these methods cannot achieve good control over the opening ratio and opening size.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for converting closed-cell foamed plastics to open-celled foamed plastics based on heat-driven shape memory effect, comprising the steps of:

[0024] Step 1, take a piece of closed-cell polymer foam, such as polyvinyl chloride (PVC) closed-cell foam, as a raw material for manufacturing, with a length and width of 100mm, a thickness of 25mm, and a glass transition temperature of 80°C;

[0025] Step 2, compress the piece of closed-cell foam to 20% strain at room temperature, and then release the load;

[0026] Step 3, the compressed foam is heated at a temperature above its glass transition temperature for 3 to 10 minutes, and then cooled to room temperature. At this point the foam has transformed into an open cell foam.

Embodiment 2

[0028] A method for converting closed-cell foamed plastics to open-celled foamed plastics based on heat-driven shape memory effect, comprising the steps of:

[0029] Step 1, take a piece of closed-cell polymer foam, such as polyethylene terephthalate (PET) closed-cell foam as a raw material for manufacturing, with a length and width of 50 cm, a thickness of 10 cm, and a glass transition temperature of 100 °C;

[0030] Step 2, compressing the sheet of closed-cell foam above its glass transition temperature to 50% strain, followed by releasing the load;

[0031] Step 3, the compressed foam was heated above its glass transition temperature for 1 minute and then cooled to room temperature. At this point the foam has transformed into an open cell foam.

Embodiment 3

[0033] A method for converting closed-cell foamed plastics to open-celled foamed plastics based on heat-driven shape memory effect, comprising the steps of:

[0034] Step 1, take a piece of rectangular polystyrene (PS) closed-cell foam, which is 200mm long, 300mm wide, 50mm thick, and has a glass transition temperature of 150°C;

[0035] Step 2, compressing the sheet of closed-cell foam above its glass transition temperature to 80% strain, followed by releasing the load;

[0036] Step 3, the compressed foam was heated above its glass transition temperature for 15 minutes and then cooled to room temperature. At this point the foam has transformed into an open cell foam.

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Abstract

The invention relates to a transformation method from closed-cell foamed plastics to open-cell foamed plastics based on thermal driving shape memory effect, wherein the method includes steps of a, manufacturing a closed-cell shaped memory polymer foamed plastics by an ordinary closed-cell foam plastics manufacturing method; b, compressing the manufactured closed-cell foamed plastics under room temperature or above temperature, wherein the final open-cell product has different cell opening degrees for different compression rates; c, sufficiently heating the compressed foamed plastics in the high temperature which is equal to or higher than the transformation temperature thereof, sufficiently heating for 10-over 30 minutes by depending on the size of the foamed plastics; d, cooling the foamed plastics to room temperature. Due to the shape memory effect of the material, the heated foamed plastics can basically recover the dimension before compression, but the foamed plastics at the moment has been transformed to be the open-cell foamed plastics. The method is simple in steps, and needs not complex machine devices, is low in cost, fast in transformation process, and free from chemical change in full process; the final cell opening rate can be well controlled.

Description

technical field [0001] The invention relates to a method for manufacturing open-cell foamed plastics, in particular to a heat-driven conversion method from closed-cell foamed plastics to open-celled foamed plastics based on the shape memory effect, and belongs to the field of foamed plastics manufacturing. Background technique [0002] Foam plastic is a very common and widely used material in modern product packaging and sealing. Due to its relatively good shock resistance and sealing performance, it is usually used to directly wrap the product, so as to achieve the purpose of anti-drop, shock resistance and non-abrasive product. Since the beginning of the 21st century, the development of foam plastics has been rapid, and its derivative products have become more widely used due to the improvement of the mechanical properties of the materials. Today, foam plastics can be seen not only in the packaging and sealing industry, but also in the composite material industry that req...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/36
CPCC08J9/36C08J2205/05C08J2323/06C08J2323/08C08J2325/06C08J2327/06C08J2367/02C08J2375/04
Inventor 孙丽黄为民王韬熹
Owner 象山联华泡沫塑料有限公司
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