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High-molecular polymer foaming material as well as preparation method and application thereof

A technology of high molecular polymer and foaming materials, applied in the field of foaming materials, can solve the problems of limited application, single pore size, enhanced friction and wear, etc., to achieve the effects of wide adaptability, easy access, and increased diffusion rate

Active Publication Date: 2021-10-01
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the current supercritical CO 2 CO 2 The problem of too long saturation time makes most of the research limited to film foaming, and there are few studies on sheet foaming, especially for high-performance special engineering plastic foaming, which greatly limits its application in industrial production. Applications
[0006] In addition, using conventional supercritical CO 2 The polymer foam material prepared by the foaming method has a single pore size. When it is used as a porous self-lubricating polymer in the field of friction lubrication, it can only realize the circulating supply and suction of lubricating oil at one speed, and it cannot be achieved once the centrifugal force is changed. Continuous oil supply is realized, and the lubricating oil film cannot be continuously stabilized, resulting in enhanced friction and wear

Method used

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  • High-molecular polymer foaming material as well as preparation method and application thereof
  • High-molecular polymer foaming material as well as preparation method and application thereof
  • High-molecular polymer foaming material as well as preparation method and application thereof

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preparation example Construction

[0039] The invention provides a kind of preparation method of polymer foam material, comprises the following steps:

[0040] The high molecular polymer powder is cold pressed and then sintered to obtain a porous polymer;

[0041] The porous polymer was subjected to supercritical CO 2 foaming to obtain a high molecular polymer foam material.

[0042] In the invention, the high molecular polymer powder is cold-pressed and then sintered to obtain a porous polymer. In the present invention, the high molecular polymer preferably includes polyphenylene sulfide, polysulfone, polymethyl methacrylate, polytetrafluoroethylene, polycarbonate, polystyrene or polyetherimide.

[0043]In the present invention, the high molecular polymer powder is preferably dried and sieved before cold pressing; the present invention has no special requirements on the aperture of the sieved, it can be selected according to the specific high molecular polymer type, In a specific embodiment of the present i...

Embodiment 1

[0056] (1) Put the polyetherimide powder with a particle size of 130-180 μm after drying into the mold, and press it into a sheet-like solid in a flat vulcanizer at 5 MPa and room temperature for 30 minutes. Then put it into a sintering furnace and sinter at 300°C for 2.5h to obtain a porous polyetherimide (referred to as porous PEI), which was subjected to mercury intrusion analysis. The results showed that the average pore diameter of the obtained porous PEI was 9.6 microns, and the porosity 20%.

[0057] At the same time, a solid non-porous PEI sheet was prepared for comparison. The preparation method was as follows: the PEI powder was put into a mold, sintered at 280° C. and 10 MPa, and cooled to obtain a solid non-porous PEI.

[0058] (2) Cut the obtained porous PEI into 2mm and 7mm thin slices, which are recorded as 2mm-porous and 7mm-porous respectively, and cut the solid non-porous PEI into 2mm sheets, which are recorded as 2mm-non-porous, and put them into high pressu...

Embodiment 2

[0066] Steps (1)~(3) are identical with embodiment 1, and steps (4)~(5) are as follows:

[0067] (4) Set the foaming condition to 35°C, 15MPa, under which conditions 2mm-porous, 7mm-porous and 2mm-non-porous are subjected to supercritical CO 2 Adsorption, take out at intervals, weigh and calculate CO of different PEI samples 2 Adsorption capacity, the calculation formula is shown in formula I, CO at different times 2 The adsorption capacity as image 3 shown;

[0068] according to image 3 It can be seen that compared with Example 1, the temperature of this example is higher, CO 2 The diffusion rate is faster, the CO of 2mm porous material PEI and 7mm porous PEI 2 At the same time, the adsorption capacity reached the highest value rapidly, but due to the increase in temperature, the CO 2 The density decreases, so the highest adsorption capacity is about 9.2%; and the adsorption capacity of porous PEI is much higher than that of solid PEI.

[0069] (5) When CO 2 When the ...

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Abstract

The invention relates to the technical field of foaming materials, and provides a high-molecular polymer foaming material as well as a preparation method and application thereof. The preparation method comprises the following steps: introducing pores into a polymer, then carrying out supercritical CO2 foaming on the obtained porous polymer, and increasing the diffusion rate of CO2 and accelerating the time from gas dissolution to the saturation of the polymer by utilizing the high specific surface area of the porous polymer. The method provided by the invention is not only suitable for thin film foaming, but also suitable for sheet polymer foaming, is also suitable for various different types of polymers, and is wide in application range. The interior of the prepared polymer foam material is in a hierarchical pore shape, the polymer foam material has the advantages of being high in environment and interior interconnection, low in surface energy, large in specific surface area, high in mass transfer efficiency and the like, hierarchical pore polyetherimide can be applied to the field of friction lubrication, and the oil content and the oil retention rate at a high rotating speed can be remarkably improved due to the existence of hierarchical pores.

Description

technical field [0001] The invention relates to the technical field of foaming materials, in particular to a polymer foaming material and its preparation method and application. Background technique [0002] Polymer foaming material refers to a resin material with a large number of micropores inside the matrix. Compared with unfoamed polymers, the density of the foaming material can be reduced by 2% to 98%, and the strength ratio and stiffness ratio can be increased by 3 to 6 times. The physical foam material has the advantages of high tensile, high impact modulus and low dielectric constant. It is widely used in the fields of daily necessities packaging, industry and agriculture, automobile manufacturing, military aerospace and energy storage materials. [0003] Polymer foaming usually requires the use of chemical foaming agents, such as azobisisobutyronitrile, azodicarbonamide, etc. However, chemical blowing agents usually have certain toxicity and produce by-products, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/24C08J9/12C08J9/40C08J9/42C08L79/08C08L25/06C08L69/00C08L27/18C08L33/12C08L81/06C08L81/02
CPCC08J9/24C08J9/122C08J9/40C08J9/42C08J2203/06C08J2203/08C08J2379/08C08J2325/06C08J2483/08C08J2381/02C08J2381/06C08J2333/12C08J2327/18C08J2369/00
Inventor 王超孙慧婷王廷梅王齐华
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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