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Preparation method of modified macromolecule foaming material

A technology of foaming materials and polymers, applied in the field of foaming materials, to achieve the effect of reducing production costs and improving material performance

Inactive Publication Date: 2011-03-30
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be found from the retrieved literature that the current foaming technology is rarely able to make the foamed material have two cell structures.

Method used

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  • Preparation method of modified macromolecule foaming material
  • Preparation method of modified macromolecule foaming material
  • Preparation method of modified macromolecule foaming material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Glyceryl stearate and polystyrene are dissolved in tetrahydrofuran, and the tetrahydrofuran is volatilized at 18-25°C to prepare a modified polystyrene material. The additive glyceryl stearate is 5% by weight of polystyrene.

[0029] The modified polystyrene material is placed in the autoclave, and the volume of the material is not greater than one-twentieth of the volume of the autoclave, so as to ensure that the modified polystyrene material has enough space for foaming and molding. Close the autoclave and fill the autoclave with low-pressure CO 2 Purge for several minutes to replace the air in the kettle; among them, CO 2 The temperature>31.1℃, pressure>7.4MPa. Place the autoclave in a water bath at 40°C, and use a high-pressure pump to pump CO 2 Fill the autoclave until the pressure reaches 20MPa, and swell for 2 hours. Then quickly release the pressure until the gauge pressure is atmospheric pressure, and the pressure release rate is 5MPa / s. The sample was tak...

Embodiment 2

[0031] Glyceryl stearate and polystyrene are dissolved in tetrahydrofuran, and the tetrahydrofuran is volatilized at 18-25°C to prepare a modified polystyrene material. The additive glyceryl stearate is 10% by weight of polystyrene.

[0032] The modified polystyrene material is placed in the autoclave, and the volume of the material is not greater than one-twentieth of the volume of the autoclave, so as to ensure that the modified polystyrene material has enough space for foaming and molding. Close the autoclave and fill the autoclave with low-pressure CO 2 Purge for several minutes to replace the air in the kettle; among them, CO 2 The temperature>31.1℃, pressure>7.4MPa. Place the autoclave in a water bath at 40°C, and use a high-pressure pump to pump CO 2 Fill the autoclave until the pressure reaches 20MPa, and swell for 2 hours. Then quickly release the pressure until the gauge pressure is atmospheric pressure, and the pressure release rate is 5MPa / s. The sample was ta...

Embodiment 3

[0034]The polystyrene material is placed in the autoclave, and the volume of the material is not greater than one-twentieth of the volume of the autoclave, so as to ensure that the modified polystyrene material has enough space for foaming and molding. Close the autoclave and fill the autoclave with low-pressure CO 2 Purge for several minutes to replace the air in the kettle; among them, CO 2 The temperature>31.1℃, pressure>7.4MPa. Place the autoclave in a water bath at 40°C, and use a high-pressure pump to pump CO 2 Fill the autoclave until the pressure reaches 20MPa, and swell for 2 hours. Then quickly relieve the pressure until the gauge pressure is normal pressure, and the pressure relief rate is 5MPa / s. The sample was taken out and placed at 70°C for foaming, and its quenched section was analyzed by scanning electron microscope. The experimental results of the cell diameter and cell density of the modified material obtained in this example are listed in Table 1, where...

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Abstract

The invention relates to a preparation method of modified macromolecule foaming material in the technical field of foaming material. The preparation method comprises the following steps of: step 1. dissolving polystyrene in tetrahydrofuran to volatilize and remove the tetrahydrofuran, and preparing to obtain modified polystyrene material; and step 2. putting the modified polystyrene material in CO2 fluid under the supercritical state for swelling, pressure relief and foaming, and obtaining modified polystyrene foaming material. Foaming material obtained by the preparation method of the invention has two cellular structures at the same time, the preparation method can improve material performance and reduce preparation cost, and the method is friendly to the environment.

Description

technical field [0001] The invention relates to a preparation method in the technical field of foaming materials, in particular to a preparation method of a modified polymer foaming material. Background technique [0002] The traditional foaming method is to add a thermally decomposed chemical foaming agent to the material to decompose it by heat. The common ones are sodium chloride carbonate, ammonium carbonate, azodicarbonamide (commonly known as AC foaming agent), diisobutyl diisobutyl Wax and N, N-dimethyl N, N-dinitroso terephthalamide, etc. The chemical foaming agent used in the traditional foaming method has certain toxicity. At the same time, due to the uncontrollability of the foaming process, it is gradually eliminated in actual industrial production and replaced by a more environmentally friendly and safer foaming technology. with supercritical CO 2 and N 2 The physical foaming method based on physical blowing agent such as ect. is widely paid attention to. Su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K5/101C08J9/12C08L25/06
Inventor 严洁峰杨斌杨婧林士全赵亚平
Owner SHANGHAI JIAOTONG UNIV