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Preparation method of water-soluble polyimide resin emulsion and method for strengthening polyimide fiber paper-based material

A polyimide resin, polyimide fiber technology, applied in the directions of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material processing, non-fiber pulp addition, etc., can solve environmental hazards, difficult storage, organic Solvent is difficult to transport and other problems, to achieve the effect of optimizing milk temperature, increasing physical properties, and optimizing emulsification time

Inactive Publication Date: 2015-01-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A large amount of organic solvents used to dilute polyimide resin raw materials are easy to cause harm to the human body during use, and even cause great harm to the environment after the organic solvents volatilize, and organic solvents are difficult to transport and store

Method used

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  • Preparation method of water-soluble polyimide resin emulsion and method for strengthening polyimide fiber paper-based material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation method of the water-soluble polyimide resin emulsion in this embodiment is: mix the polyimide resin and sodium dodecylbenzenesulfonate according to the molar ratio of 1:0.03, put it in a water bath and stir and emulsify at 54°C for 40min , and use a constant pressure dropping funnel to add water dropwise during the stirring and emulsification process until the system changes from the initial W / O phase to the O / W phase, and a water-soluble polyimide resin emulsion with a solid content of 20% is prepared. After adding deionized water, the experimental phenomenon in the whole experiment process is that the viscosity first increases and then decreases. Take a watch glass and drop a drop of deionized water on the watch glass. The experimental phenomenon in the whole experiment process is that the viscosity first rises and then drops. Take a watch glass, drop a drop of deionized water on the watch glass, take the reaction system during stirring and emulsificat...

Embodiment 2

[0018] The preparation method of the water-soluble polyimide resin emulsion in this embodiment is: mix the polyimide resin and sodium dodecylbenzenesulfonate according to the molar ratio of 1:0.05, put it in a water bath and stir and emulsify at 30°C for 70min , and use a constant pressure dropping funnel to add water dropwise during the stirring and emulsification process until the system changes from the initial W / O phase to the O / W phase to prepare a water-soluble polyimide resin emulsion with a solid content of 5%. After adding deionized water, the experimental phenomenon in the whole experiment process is that the viscosity first increases and then decreases. Take a watch glass and drop a drop of deionized water on the watch glass. The experimental phenomenon in the whole experiment process is that the viscosity first rises and then drops. Take a watch glass, drop a drop of deionized water on the watch glass, take the reaction system during stirring and emulsification, wh...

Embodiment 3

[0021] The preparation method of the water-soluble polyimide resin emulsion in this example is: mix the polyimide resin and sodium dodecylbenzenesulfonate according to the molar ratio of 1:0.02, put it in a water bath and stir and emulsify at 70°C for 20min , and use a constant pressure dropping funnel to add water dropwise during the stirring and emulsification process until the system changes from the initial W / O phase to the O / W phase, and a water-soluble polyimide resin emulsion with a solid content of 10% is prepared. After adding deionized water, the experimental phenomenon in the whole experiment process is that the viscosity first increases and then decreases. Take a watch glass and drop a drop of deionized water on the watch glass. The experimental phenomenon in the whole experiment process is that the viscosity first rises and then drops. Take a watch glass, drop a drop of deionized water on the watch glass, take the reaction system during stirring and emulsification...

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Abstract

The invention relates to a preparation method of a water soluble polyimide resin emulsion and method for strengthening a polyimide fiber paper-based material. The preparation method comprises the following steps: mixing polyimide resin with sodium dodecyl benzene sulfonate, stirring and emulsifying for 20-70 minutes at 30-70 DEG C; and dropwise adding water in the stirring and emulsifying process to prepare the water-soluble polyimide resin emulsion with the solid content of 5-20%. The method for strengthening the polyimide fiber paper-based material comprises the following steps: diluting the water-soluble polyimide resin emulsion with water till the solid content is reduced to 0.5-5%; then, dipping the polyimide fiber paper-based material in the diluted water soluble polyimide resin emulsion; and finally drying the dipped polyimide fiber paper-based material till being over dry. The method can avoid pollution of organic solvents; and the physical property of the polyimide fiber paper-based material treated by the method is greatly improved and the temperature resistance of the polyimide fiber paper-based material is not affected.

Description

technical field [0001] The invention belongs to the cross field of papermaking industry and chemical industry, and in particular relates to a preparation method of water-soluble polyimide resin emulsion and a method for strengthening polyimide fiber paper base material. Background technique [0002] A single polyimide fiber has excellent high and low temperature resistance, insulation, high strength, and high modulus. Compared with polyaramid Kevlar fiber and aramid fiber, polyimide fiber has higher thermal stability properties, higher elastic modulus, lower water absorption, higher limiting oxygen index, higher hydrolysis resistance and higher radiation resistance; The elastic modulus of polyimide fiber synthesized by diamine can reach 500GPa, second only to carbon fiber. Polyimide fiber is made of polyimide resin through dry spinning, wet spinning, dry-wet spinning, electrospinning, melt spinning, and liquid crystal spinning. [0003] Based on the excellent comprehensive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08L79/08D21H13/26D21H17/56
Inventor 陆赵情吴珍
Owner SHAANXI UNIV OF SCI & TECH
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