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Isostatic pressing method for refractory polybenzimidazole

A technology of isostatic pressing and polybenzimidazole, which is applied in the field of refractory polymer molding, can solve problems such as limitations, the inability to apply PBI high-performance matrix resin, and the inability to break through the overall molding problem, and achieves optimization of mechanical properties, The effect of good machinability and low friction

Inactive Publication Date: 2019-04-12
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

[0014] Domestic research on PBI mainly focuses on film, coating and fiber form. Since my country has been unable to break through its overall molding problem, PBI cannot be used as a high-performance matrix resin.
However, foreign countries have imposed strict technical monopoly and restrictions on polybenzimidazole and its composite materials.

Method used

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  • Isostatic pressing method for refractory polybenzimidazole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 A kind of isostatic pressing molding method of refractory polybenzimidazole comprises the following steps:

[0035] ⑴Cold isostatic pressing into blank:

[0036] At room temperature, in an air atmosphere, put 130 g of polybenzimidazole molding powder into a flexible rubber sleeve, apply a pressure of 20 MPa in a cold isostatic press, and keep it for 5 hours; after the pressing is completed, remove the rubber sleeve to obtain Cold isostatic pressing blank.

[0037] ⑵The welding seal of the sheath:

[0038] The sheath is made of pure aluminum, and its shape is a hollow thin-walled cylinder with one end closed and the other open. Put the cold isostatic pressing blank into the sheath, then weld the sheath cover with the exhaust pipe on the opening end of the sheath, and use a vacuum pump to evacuate to 1×10 -2 Pa, and then use hydraulic sealing pliers to seal the exhaust pipe to obtain the workpiece to be pressed in which the aluminum sheath encapsulates the...

Embodiment 2

[0042] Embodiment 2 A kind of isostatic pressing forming method of refractory polybenzimidazole comprises the following steps:

[0043] ⑴Cold isostatic pressing into blank:

[0044] At room temperature, in an air atmosphere, put 65 g of polybenzimidazole molding powder into a flexible rubber sleeve, apply a pressure of 50 MPa in a cold isostatic press, and keep it for 4 hours; after the pressing is completed, remove the rubber sleeve to obtain Cold isostatic pressing blank.

[0045] ⑵The welding seal of the sheath:

[0046] The sheath is made of pure aluminum, and its shape is a hollow thin-walled cylinder with one end closed and the other open. Put the cold isostatic pressing blank into the sheath, then weld the sheath cover with the exhaust pipe on the opening end of the sheath, and use a vacuum pump to evacuate to 7×10 -3 Pa, and then use hydraulic sealing pliers to seal the exhaust pipe to obtain the workpiece to be pressed in which the aluminum sheath encapsulates the ...

Embodiment 3

[0050] Embodiment 3 A kind of isostatic pressing forming method of refractory polybenzimidazole comprises the following steps:

[0051] ⑴Cold isostatic pressing into blank:

[0052] At room temperature, in an air atmosphere, put 195 g of polybenzimidazole molding powder into a flexible rubber sleeve, apply a pressure of 80 MPa in a cold isostatic press, and keep it for 3 hours; after the pressing is completed, remove the rubber sleeve to obtain Cold isostatic pressing blank.

[0053] ⑵The welding seal of the sheath:

[0054] The sheath is made of pure aluminum, and its shape is a hollow thin-walled cylinder with one end closed and the other open. Put the cold isostatic pressing blank into the sheath, then weld the sheath cover with the exhaust pipe on the opening end of the sheath, and use a vacuum pump to evacuate to 5.2×10 -3 Pa, and then use hydraulic sealing pliers to seal the exhaust pipe to obtain the workpiece to be pressed in which the aluminum sheath encapsulates t...

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Abstract

The invention relates to an isostatic pressing method for refractory polybenzimidazole. The method includes steps of (1), cold isostatic pressing blank formation, specifically, polybenzimidazole molding powder is loaded into a flexible rubber sleeve in the air atmosphere and under a room temperature, and the flexible rubber sleeve is removed after pressing by a cold isostatic press to obtain the cold isostatic pressing blank; (2), packing sleeve welding and sealing, specifically, the cold isostatic pressing blank is put into a packing sleeve, a packing sleeve cover with a suction pipe is welded to the opening end of the packing sleeve, the packing sleeve is vacuumized through the suction pipe and then the suction pipe is sealed through a pair of hydraulic sealing pliers to obtain the workpiece to be pressed; and (3), hot isostatic pressing molding, specifically, the workpiece to be pressed is cooled to be 150 DEG C or below after being pressed by a hot isostatic press, and the packingsleeve is removed to obtain the refractory polybenzimidazole material. According to the method, the blank is obtained by adopting the cold isostatic pressing technology; sinter molding is competed through hot isostatic pressing technology at high temperature and high pressure; and the densification of the molding material is achieved by regulating and controlling the cooling rate after hot isostatic pressing to control the degree of crystallization of the polymer molecular chain.

Description

technical field [0001] The invention relates to a molding method of refractory polymers, in particular to an isostatic pressing molding method of refractory polybenzimidazole. Background technique [0002] Refractory polymers generally refer to fully aromatic polymers with a rigid structure. Their outstanding features are high temperature resistance and excellent chemical and thermal stability. However, due to the extremely high rigidity of their molecular chains, such polymers generally It is difficult to melt or soften at high temperature, which poses a huge technical challenge to its molding. [0003] Polybenzimidazole (Polybenzimidazole, PBI) is a class of high-performance special engineering plastics (Formula 1) whose repeating unit is a benzimidazole ring. It is formed by the dehydration condensation of aromatic tetraamines and aromatic dicarboxylic acids. Various forms of composite materials such as resin matrix, film, coating and high-performance fiber have been app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C43/00B29C43/58
CPCB29C43/006B29C43/58B29C2043/5808B29C2043/5816
Inventor 陶立明张耀明王廷梅王齐华
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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