Preparation method of easy-to-dye polyimide fabric employing chemical reduction method

Abstract

The invention relates to a preparation method of easy-to-dye polyimide fabric employing a chemical reduction method. The method comprises the following steps: (1) processing the polyimide fabric with an alkaline reducing liquid, to be specific, putting the polyimide fabric into a compressive container containing the alkaline reducing liquid, wherein the pressure is 0.1-0.2MPa, the temperature is 100-110 DEG C and the processing time is 10-60 minutes; and (2) washing the polyimide fabric: taking out and washing the polyimide fabric processed by the alkaline reducing solution for 6-10 times, and drying in an oven at 70-100 DEG C for 1-2 hours, wherein the alkaline reducing liquid is a mixed solution of sodium hydroxide or sodium carbonate and a reducing agent; the molar ratio of the sodium hydroxide or sodium carbonate to the reducing agent is 2 to 1; the molar percent concentration of the sodium hydroxide or sodium carbonate is 0.1%-10%; and the molar percent concentration of the reducing agent is 0.05%-5%. The polyimide fabric is changed into dyeable fabric from un-dyed fabric on the basis of not damaging the physical and chemical properties of the polyimide fabric; and the problem that polyimide is difficult to dye is solved.

Description

technical field [0001] The invention relates to a preparation method of an easily dyeable polyimide fabric by a chemical reduction method, and belongs to the technical field of functional textile materials. Background technique [0002] Polyimide has good mechanical properties, and can withstand temperatures as high as 400°C, and can maintain normal performance at ultra-low temperatures below -200°C. It also has good insulation properties. It can be said that the overall performance is very good. Due to these good properties, the development prospect of polyimide is also very impressive. [0003] According to the different monomers that make up polyimide, polyimide can be divided into aliphatic polyimide without benzene ring, a semi-aromatic polyimide with monomer containing benzene ring and two kinds of mono There are three types of aromatic polyimides containing benzene rings. According to thermal properties, it can be divided into thermoplastic and thermosetting polyimi...

AI Technical Summary

Problems solved by technology

[0009] However, if polyimide fabrics are to be well applied, it is necessary to solve the difficult problem of dyeing and limited textile applications.

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