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Polyimide formed body manufacture and device thereof

A technology of polyimide and manufacturing method, applied in the direction of coating, etc., can solve problems such as poor molding

Inactive Publication Date: 2003-04-02
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been achieved so far to use it for the molding of molded objects. The reason is that once the chemical curing agent is mixed, the curing reaction proceeds at a certain speed even at room temperature. During the process, there may be unsatisfactory phenomena such as poor molding due to curing

Method used

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  • Polyimide formed body manufacture and device thereof
  • Polyimide formed body manufacture and device thereof
  • Polyimide formed body manufacture and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0180] Add 24.60kg dimethylformamide (DMF) in the container that stirring paddle is housed, dissolve 2.57kg4 under nitrogen flow, 4'-diaminodiphenyl ether. Add 2.81 kg of pyromellitic dianhydride in small amounts each time while stirring, and stop adding pyromellitic dianhydride when the viscosity of the system reaches about 380 Pa·s. Then, the stirring was continued for 30 minutes, and then the stirring was stopped to obtain a polyamic acid solution. During the reaction, the system was replaced under nitrogen flow, and the temperature was maintained at 20°C. Add 2.4kg of isoquinoline, 6.0kg of acetic anhydride and 2.6kg of DMF into another container and stir evenly to prepare a chemical curing agent solution. In terms of weight ratio, the ratio of polyamic acid solution:chemical curing agent is 100:30. From each liquid tank, each liquid is sent into a multi-stage multi-blade mixer device through a pipeline with a gear pump. While stirring the two liquids at a rotation speed ...

Embodiment 2

[0187] Charge 8.20kg dimethylformamide (DMF) in the container that stirring paddle is housed, dissolve 862g 4,4'-diaminodiphenyl ether under nitrogen stream. To this, 938 g of pyromellitic dianhydride was added in small amounts each time, stirred evenly, and the stirring was stopped when the viscosity of the system reached about 300 Pa·s to obtain a polyamic acid solution. Put 1.05 kg of Ishihara Sangyo Co., Ltd. FT-300 and 4.50 kg of DMF into another container, stir evenly, and then use an ultrasonic disperser to disperse the metal filler in the dispersion evenly to obtain a filler dispersion. Add and dissolve the dispersion liquid obtained above to the polyamic acid solution obtained above, and stir evenly. Then, while continuing to stir, the vessel was depressurized and degassed.

[0188] Add 1.3kg of isoquinoline, 2.2kg of acetic anhydride and 4.0kg of DMF into another container, stir and prepare a chemical curing agent solution. In terms of weight ratio, the ratio of po...

Embodiment 3

[0192] Put 8.2kg of dimethylformamide (DMF) into a container equipped with a stirring paddle, dissolve 862g of 4,4'-diaminodiphenyl ether under a nitrogen stream, and add 938g of pyromellitic acid diphenyl ether to it in small amounts each time. anhydride, stir evenly. Stop stirring when the viscosity of the system reaches 300 Pa·s to obtain a polyamic acid solution. Put 1.05 kg of Ishihara Sangyo Co., Ltd. FT-300 and 4.50 kg of DMF into another container, stir evenly, and use an ultrasonic disperser to disperse the metal filler in the dispersion evenly to obtain a filler dispersion. To the polyamic acid solution obtained above, add and dissolve the dispersion liquid obtained above, and stir uniformly.

[0193] Take out 7.82kg above-mentioned resin mixed solution, add 0.13kg isoquinoline therein, fully stir, carry out defoaming under reduced pressure while continuing to stir. This solution was referred to as B solution.

[0194] Similarly, add 0.22kg of acetic anhydride to ...

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Abstract

The present invention provides a method and an apparatus for producing a polyimide molding which have superior productivity and accuracy of dimension. The invention particularly relates to a tubular polyimide applicable to an electrophotographic device, such as a laser-beam printer and a copying machine, or a precision driving belt required for high strength and high dimensional stability. The method of producing a polyimide molding according to the present invention comprises the steps of: mixing a solution containing polyamic acid as a main component and a chemical curing agent; providing a mixture to a mold while the mixture is still fluid; after the polyamic acid contained in the mixture is changed into a semi-formed body which develops self-supporting properties, taking out the semi-formed body from the mold, or inserting a mold for heating without taking out the semi-formed body, or removing a part of the mold; and drying solvents which are present on the surface of or inside the semi-formed body by heating the semi-formed body to produce a polyimide molding.

Description

technical field [0001] The present invention relates to a method for producing a polyimide molded article obtained by drying and imidizing a polyamic acid solution, and an apparatus for producing it. technical background [0002] Polyimide resin has excellent heat resistance, dimensional stability, mechanical strength, and chemical stability, so it is used in various applications such as flexible printed circuit boards, heat-resistant wire insulation materials, and wear-resistant components. Its tubular molded products For example, there are precision-driven conveyor belts, heat-fixing belts for electrophotographic devices such as copiers and laser printers, and intermediate transfer belts. [0003] Polyimide moldings have been manufactured by several methods according to their shape. It can be manufactured continuously when it is in the form of a film. The method used is mainly to cast the resin solution on the circulating support body, heat and dry until the self-supporti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C37/00B29C39/00B29C39/36B29C39/38C08J5/00
CPCC08J5/00B29K2079/08B29C39/36C08J2379/08B29C39/006B29C37/0092B29C39/38
Inventor 野尻仁志柳田正美濑崎好司松谷晃男
Owner KANEKA CORP
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