Preparation method of polyvinyl alcohol microcellular foam material

A microcellular foaming material and polyvinyl alcohol technology are applied in the field of preparing polyvinyl alcohol microcellular foaming materials by using supercritical fluid technology, and can solve the problems of unstable performance of foaming materials, residual materials, incompetence and the like, Shorten saturation time, improve foaming efficiency, and achieve good pore size uniformity

Inactive Publication Date: 2018-02-23
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical foaming generally uses organic matter such as azodicarbonamide that will decompose and generate gas at high temperatures as a foaming agent. After the organic foaming agent is decomposed, there will be residues in the material, and it is difficult to be competent in some use environments that require materials.
The traditional physical foaming method is to gradually change the thermodynamic state of the gas, which can easily lead to unstable performance of the foamed material

Method used

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  • Preparation method of polyvinyl alcohol microcellular foam material
  • Preparation method of polyvinyl alcohol microcellular foam material
  • Preparation method of polyvinyl alcohol microcellular foam material

Examples

Experimental program
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Effect test

preparation example Construction

[0020] The preparation method of polyvinyl alcohol microcellular foaming material of the present invention comprises step 1, step 2 and step 3;

[0021] Step 1: Place the polyvinyl alcohol composition in the pressure vessel A, and seal the pressure vessel A, raise the temperature to the infiltration temperature, the infiltration temperature is 40°C-110°C, fill the supercritical fluid to the infiltration pressure, the infiltration pressure is 1-100°C 15MPa, then infiltrate under the infiltration temperature and pressure, and the infiltration time is 10-600min;

[0022] Step 2: The temperature of pressure vessel B is kept at the saturation temperature, and the saturation temperature is 120°C ~ 160°C, and then go through the "unload-take-install-close-fill" procedure, and the "unload-take-install-close-fill" procedure Complete within 5 minutes, then the pressure vessel B is saturated at the saturation temperature and pressure, and the saturation time is 10-60 minutes.

[0023] T...

Embodiment 1

[0067] The polyvinyl alcohol sheet (the raw material used is Japan Kuraray PVA217, the degree of alcoholysis is 88%, the degree of polymerization is 1700, and the size is 40cm×40cm×2cm), in the polyvinyl alcohol composition constituting the sheet, ethylene glycol is 20wt% , glycerol is 20wt%. Place in pressure vessel A, and seal pressure vessel A, raise the temperature to 100°C, fill with supercritical carbon dioxide to 12MPa, and then soak for 120min;

[0068] The temperature of pressure vessel B is kept at 140°C, and then it goes through the "unload-take-install-close-fill" procedure, and the completion time of the "unload-take-install-close-fill" procedure is 115s, and then pressure vessel B is saturated Saturated under temperature and saturation pressure, the saturation time is 30 minutes, the specific steps of the "unloading-taking-installing-closing-filling" procedure are: depressurize the pressure vessel A, and take out the soaked polyvinyl alcohol sheet from the pressu...

Embodiment 2

[0072] Except for changing the polyvinyl alcohol raw material (Sinopec, PVA088-20, degree of alcoholysis 88%, degree of polymerization 1700) constituting the polyvinyl alcohol sheet in Example 1, it was the same as Example 1.

[0073] The prepared polyvinyl alcohol microcellular foamed sheet was analyzed by scanning electron microscopy for its internal cell morphology, as shown in figure 2 As shown, the measured average pore diameter is 16 μm, and the number of cells whose diameter is more than 2 times the average diameter is 1.8%. The cell uniformity is good, and the calculated cell density is 5.13×10 9 piece / cm 3 .

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Abstract

The invention relates to a method for preparing a polyvinyl alcohol microcellular foam material by utilizing the supercritical fluid technique. A polyvinyl alcohol composition is put in a device filled with a specific supercritical fluid at the specific soaking temperature at the soaking pressure, the heat and the pressure are preserved and maintained for a specific period of time, then the heat and the pressure are preserved and maintained for a specific period of time at the higher saturation temperature and higher saturation pressure of the supercritical fluid, the pressure is relieved at the specific decompression rate, and the polyvinyl alcohol microcellular foam material is obtained. The method is an efficient polyvinyl alcohol microcellular foam material preparation method suitablefor industrial production.

Description

technical field [0001] The invention relates to a method for preparing a polyvinyl alcohol microcellular foaming material, in particular to a method for preparing a polyvinyl alcohol microcellular foaming material using supercritical fluid technology. Background technique [0002] Polymer microcellular foamed material is a material with superior performance, exhibiting good mechanical properties, thermal properties and processability. Compared with unfoamed polymers, the density of microcellular foamed materials can be reduced by 5% to 95%, the impact strength can be increased by up to 5 times, the toughness is increased by 5 times, the stiffness is increased by 3 to 5 times, and the fatigue life is extended by 5 times. The dielectric constant and thermal conductivity drop dramatically. Foamed polymer materials have been widely used in recent years, but the foamed materials currently on the market are poorly degradable and cause damage to the environment. Therefore, it is v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L29/04C08K5/053
CPCC08J9/122C08J9/0023C08J2203/06C08J2203/08C08J2205/044C08J2329/04
Inventor 何智龙张利孙佳成王雅祺包锦标
Owner NINGBO UNIV
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