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Soluble polyimide molded plastic and preparation method thereof

A technology of polyimide and polyimide powder, which is applied in the field of fusible polyimide molding compound and its preparation, and can solve the problem of molded pink color becoming darker, powder particle size large, and easy to agglomerate molded parts and other problems, to achieve the effect of constant color, high retention rate of mechanical properties and good mechanical properties

Active Publication Date: 2012-06-13
SHANGHAI PLASTICS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyimide formed by a-ODPA and diphenyl ether diamine can be dissolved in the solvent of the original polyamic acid, and cannot be prepared by the above-mentioned conventional method
There are also people who prepare polyimide solution first, and then disperse it into a large amount of polyimide poor solvent to form powder, but this method uses a large amount of flammable and explosive solvents, and the obtained powder has a large particle size. The prepared powder contains a high boiling point solvent inside and is not volatile, and it is easy to cause the obtained molding powder to become darker, different in thickness, easy to agglomerate, and the molded parts contain pores and other disadvantages

Method used

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  • Soluble polyimide molded plastic and preparation method thereof
  • Soluble polyimide molded plastic and preparation method thereof
  • Soluble polyimide molded plastic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Put 310g (1mol) of 2,3,3',4'-diphenyl ether tetracarboxylic dianhydride, 200g of 4,4'- di Aminodiphenyl ether and 2200ml dimethylacetamide were reacted at room temperature for 4 hours to obtain a polyamic acid solution, and 1050g of acetic anhydride, 260g of triethylamine and 220g of toluene were added, and the imidization reaction was completed when the reaction was continued for 1.0, and the precipitated product was filtered. The polyimide powder is then washed three times with 1000ml of acetone, filtered, baked at 65°C for 2 hours, and then heat-treated at 220°C~280°C for 2~5 hours to obtain 426.6g of a-type polyimide with a yield of 90 %, number average molecular weight (Mn) = 33000, weight average molecular weight (Mw) = 65000; the polyimide was molded at 310°C / 30MPa for plastic samples, and the performance indicators of the plastic samples are shown in Table 2 below:

[0039] Glass transition temperature (Tg), 277°C

[0040] 5% loss temperature of thermogravimetr...

Embodiment 2

[0054] Synthesize polyamic acid in the same way as Example 1, but add 2570g of dehydrating agent acetic anhydride, 700g of triethylamine, 230g of xylene, imidization time of 1.5 hours, and wash three times with acetone, other operations and formulations and implementation The same as Example 1, except that the polyimide molecular weight is Mn=36000, Mw=70000, other performance indicators are the same as Example 1.

Embodiment 3

[0056] Except that the reaction time for preparing polyamic acid is 5 hours, add 3600g of acetic anhydride, 260g of triethylamine, 1400g of toluene, imidization time of 2 hours, wash three times with 800g of acetone and 200g of water, other operations and formulas are the same as in Example 1 . Except that polyimide molecular weight is Mn=30000, Mw=52000, other performance indexes are the same as embodiment 1.

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Abstract

The invention discloses a soluble polyimide molded plastic and a preparation method thereof. The method comprises: a step 1 of preparing a solution of polyamic acid, which is to react 2,3,3'4'-tetracarboxydiphthalic ether dianhydride with diamino diphenyl ether in a molar ratio of 1:1 in an aprotic polar solvent for 3 to 5 hours at room temperature to obtain the solution of polyamic acid; a step 2 of chemical imidization, which is to add 40 to 160 weight parts of dehydrating agent, 5 to 50 weight parts of tertiary amine organic alkaline catalyst and a nonpolar aromatic hydrocarbon into 100 weight parts of solution of polyamic acid, stir forcefully for 0.5 to 2 hours, precipitate powder, filter and obtain a-type polyimide molded plastic powder. Compared with s-type polyimide, the a-type polyimide has the advantages that: the molding temperature is lowered by 70 DEG C, and the mechanical properties at 220 DEG C are far higher than those of the s-type polyimide; and the a-type polyimide is soluble and fusible. The preparation method of the a-type polyimide molded plastic powder has the characteristics of mild condition, safe and convenient operation, high yield and good market prospect.

Description

technical field [0001] The present invention relates to a kind of dissolvable meltable polyimide molding compound and its preparation method, relate to the reaction of 2,3,3',4'-diphenyl ether tetracarboxylic dianhydride and diaminodiphenyl ether more precisely The preparation method of the prepared polyimide molding powder and the a-ODPA (2,3,3',4-diphenyl ether tetracarboxylic dianhydride) / 3,4'-ODA (3,4 '-aminodiphenyl ether) molding powder. Background technique [0002] Polyimide has been highly valued by people for its excellent high temperature resistance, low temperature resistance, solvent resistance, radiation resistance, outstanding mechanical strength and dielectric properties, and has been widely used in aerospace, automotive industry, microelectronics, Flat panel display and many other high-tech fields. Kapton has been developed by DuPont since the early 1960s ? Since the film, it has a history of nearly 50 years. This kind of polyimide obtained by linear pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10
CPCC08G73/1067C08G73/1007C08G73/1028C08G73/1071C08G73/1032C08G73/1046
Inventor 邱孜学贺飞峰包来燕吕凯
Owner SHANGHAI PLASTICS RES INST CO LTD
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