Method for preparing super-microporous polymer material without surface gas traces

A polymer material and ultra-microporous technology, which is applied in the field of non-supercritical foaming preparation of ultra-microporous polymer materials, can solve the problems such as the inability to prepare with microporous polymer materials, and achieves easy control, good quality, and ease of use. The effect of cell structure

Inactive Publication Date: 2014-06-11
姜明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the size of the microspheres obtained by using the existing thermal expansion microsphere synthesis technology is in the range of 10-50 μm, and the size of the microspheres will be larger after thermal expansion (tens of times), so it cannot be used for the preparation of microporous polymer materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, polymer nano-core-shell particles were prepared by one-step phase separation emulsion polymerization. The specific ratio and operation sequence were as follows: 1) 56g styrene, 260g distilled water, 72g isooctane, 2g methacrylic acid, 40g Methanol was mixed in the flask, and 12 ml of tert-dodecyl mercaptan was added rapidly to the mixture, and the temperature was raised to 90 °C, and then 24 g of 5% mass fraction of sodium persulfate aqueous solution was added dropwise at a constant speed within 75 min. In the reaction vessel, the reaction process was kept stirring rapidly, and the reaction temperature remained at 90 °C. 2) Within 225 minutes, add 24g of 5% mass fraction sodium persulfate aqueous solution, 44g of sodium dodecylsulfonate and sodium dodecylbenzenesulfonate aqueous solution, 120g of styrene, 20g of divinylbenzene, 1g At the same time, the mixture of methacrylic acid was added dropwise into the reaction vessel at a constant speed, and the reaction co...

Embodiment 2

[0029]First, polymer nano-core-shell particles were prepared by one-step phase separation emulsion polymerization. The specific ratio and operation sequence were as follows: 1) 56g styrene, 260g distilled water, 72g isooctane, 2g methacrylic acid, 40g Methanol was mixed in the flask, and 12 ml of tert-dodecyl mercaptan was added rapidly to the mixture, and the temperature was raised to 90 °C, and then 24 g of 5% mass fraction of sodium persulfate aqueous solution was added dropwise at a constant speed within 75 min. In the reaction vessel, the reaction process was kept stirring rapidly, and the reaction temperature remained at 90 °C. 2) Within 225 minutes, add 24g of 5% mass fraction sodium persulfate aqueous solution, 44g of sodium dodecylsulfonate and sodium dodecylbenzenesulfonate aqueous solution, 120g of styrene, 20g of divinylbenzene, 1g At the same time, the mixture of methacrylic acid was added dropwise into the reaction vessel at a constant speed, and the reaction con...

Embodiment 3

[0033] First, polymer nano-core-shell particles were prepared by one-step phase separation emulsion polymerization. The specific ratio and operation sequence were as follows: 1) 56g styrene, 260g distilled water, 72g isooctane, 2g methacrylic acid, 40g Methanol was mixed in the flask, and 12 ml of tert-dodecyl mercaptan was added rapidly to the mixture, and the temperature was raised to 90 °C, and then 24 g of 5% mass fraction of sodium persulfate aqueous solution was added dropwise at a constant speed within 75 min. In the reaction vessel, the reaction process was kept stirring rapidly, and the reaction temperature remained at 90 °C. 2) Within 225 minutes, add 24g of 5% mass fraction sodium persulfate aqueous solution, 44g of sodium dodecylsulfonate and sodium dodecylbenzenesulfonate aqueous solution, 120g of styrene, 20g of divinylbenzene, 1g At the same time, the mixture of methacrylic acid was added dropwise into the reaction vessel at a constant speed, and the reaction co...

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Abstract

The invention provides a method for preparing a super-microporous polymer material without surface gas traces. The method comprises the following steps: (1) synthesizing polymer nano core-shell particles by adopting a one-step emulsion polymerization method, wherein microspheres are in a core-shell structure and have the sizes in the range of 80-400nm, the structure is uniform, and the shell layer has a chemical cross-linking structure; and (2) compounding the core-shell particles and a polymer matrix through a melt blending or in-situ polymerization method, wherein the material has a closed pore structure. According to the super-microporous polymer material prepared by adopting the process, the porous size distribution ranges from 100 to 400nm, the number of pores in unit volume reaches 10<12> cells/cm<3>, and the polymer material has typical microporous polymer structural characteristics. According to the method, gas diffusion can be effectively limited, and gas traces on the material surface are avoided; the processing process is simple, fast and economic, the processing window is wide, and the pore structure is easily controlled; and high pressure and high pressure drop rate are not needed, the cost can be reduced, and the production efficiency is improved; molding is performed through a traditional polymer processing method, special equipment is not needed, and the cost is low.

Description

technical field [0001] The invention relates to a preparation method of an ultramicroporous polymer material, in particular to a non-supercritical foaming preparation method of an ultramicroporous polymer material without surface gas marks. Background technique [0002] The traditional foaming processing method will lead to a wider pore size distribution, a lower number of pores per unit volume and a larger pore size. These large and unevenly sized cells will lead to a significant decrease in the mechanical properties of the product. At the same time, poor surface quality, low heat distortion temperature, and poor dimensional stability are also key issues that limit the application of traditional foamed polymer materials. Microcellular foamed polymer materials can solve these problems to a large extent. Microporous polymer technology was originally invented by Professor Nam P. Suh of the Massachusetts Institute of Technology (MIT) in 1979, as described in U.S. Patent 447366...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/08C08L23/06C08L23/12C08L25/06C08L63/00C08F212/08C08F2/26C08J9/00B29C43/58
Inventor 姜明熊传溪李海蓉何力董丽杰
Owner 姜明
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