Defoaming method in synthesizing process of polyamide resin

A technology of polyamic acid resin and synthesis process, which is applied in the direction of foam dispersion/prevention, and can solve problems such as abnormal production continuity, defects in manufactured products, and high viscosity, and achieve shortened defoaming time, reduced defoaming time, and improved color uniform effect

Active Publication Date: 2014-09-24
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high viscosity of polyamide resin solution, for the current polyimide film manufacturing method, its defoaming method is difficult to eliminate tiny bubbles in a short period of time, resulting in abnormal production continuity and surface defects such as defects in manufactured products

Method used

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  • Defoaming method in synthesizing process of polyamide resin

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Embodiment Construction

[0017] The defoaming method embodiment of this polyamic acid resin synthetic process comprises the steps:

[0018] Ⅰ. Heat and stir slowly

[0019] After the synthesis reaction, the polyamic acid resin solution is pressed in from the reaction kettle through the feed nozzle above the tank body of the defoaming kettle. Flat, or 10mm higher than the highest point of the spiral blade. A heated medium is passed into the jacket of the defoaming kettle, or a heated heat-conducting medium can also be passed into the hollow heat-conducting medium pipe of the spiral blade to heat the polyamic acid resin solution in the kettle, and the temperature is kept at 70°C. The stirring rate is 50r / min; maintain for 1 hour; change the stirring direction every 20 minutes, alternately stirring clockwise and counterclockwise;

[0020] Ⅱ. Heating and rapid stirring

[0021] Keep the temperature unchanged, increase the stirring speed to 80r / min; change the stirring direction every 20 minutes; keep h...

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Abstract

The invention discloses a defoaming method in the synthesizing process of polyamide resin. The method comprises the following steps: heating and slowly stirring polyamide resin solution in a kettle at first at the temperature of 35 to 100 DEG C at normal pressure for 0.5 to 1.5h, wherein the stirring speed is less than or equal to 50r / min; then, quickly stirring the polyamide resin solution at a stirring speed of 60 to 100r / min at the same temperature for 2 to 4h; and casting film when the defoaming is completed, wherein CO2, nitrogen or other inert gas can be fed during the casting of the film to prevent the resin from discoloring and deteriorating at a gas flow of 0.1 to 0.8 m<3> / min, and a relative pressure of 0.3 to 0.5MPa is kept in the kettle. According to the method, the foaming is thorough, the surface quality of the film obtained later is improved, the defoaming time is short and the defoaming process is convenient in operation.

Description

technical field [0001] The invention relates to a synthesis technology of polyamic acid resin, in particular to a defoaming method in the synthesis process of polyamic acid resin. Background technique [0002] Polyimide film is a polymer material with excellent properties such as high strength, high toughness, wear resistance, high temperature resistance, and corrosion resistance. It is widely used in the electrical and electronic industry, especially in the electrical industry for various high-end electrical appliances. Primary insulation. [0003] At present, the production process of polyimide film is to use polyamic acid resin solution as raw material, and salivate on a salivating machine to obtain a self-supporting polyamic acid thick film, and then heat stretching, imidization, cooling and setting to obtain a polyimide film. amine film. In order to reduce the weight and volume of products in downstream applications, the film thickness specifications demanded by the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D19/02C08J5/18C08L79/08
Inventor 任小龙董占林
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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