Lignosulfonic acid-reinforced polypyrrole conductive paper and preparation method thereof

Abstract

The invention belongs to the technical field of functional materials and discloses a lignosulfonic acid-reinforced polypyrrole conductive paper and a preparation method thereof. The method comprises (1) separating a lignosulfonate through an ultrafiltration membrane and then purifying the lignosulfonate through a cation exchange resin to obtain lignosulfonic acid, (2) soaking a paper in the lignosulfonic acid for 10-30min, then soaking the paper in an aldehyde aqueous solution for 10-30min and heating the paper to 80-110 DEG C for a condensation reaction for 1-2h, (3) soaking the paper in a pyrrole solution for 10-30min, and (4) soaking the paper in a mixed solution of an oxidant and an inorganic acid for a reaction for 10-120min to obtain a self-assembled single-layer conductive paper andrepeating the above steps (2) to (4) to obtain a self-assembled multi-layer conductive paper. The lignosulfonic acid-reinforced polypyrrole conductive paper has high conductivity, good stability, adjustable loading capability and no dusting and can be used in the fields of surface heating materials, electromagnetic shielding materials and flexible electrode materials.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a ligninsulfonic acid reinforced polypyrrole conductive paper and a preparation method thereof. Background technique [0002] Conductive paper is a functional paper with good electrical conductivity. It has functions such as heat conduction, electromagnetic shielding, and electrostatic shielding. It can be widely used in planar heating materials, electromagnetic shielding materials, anti-static packaging materials, sensing materials, and electrochemical materials. field. At present, the preparation methods of conductive paper mainly include: mixing conductive materials and pulp fibers (Zhang Meiyun et al. [J]. China Paper, 2008, 27(3): 13-17.), bonding conductive fibers with adhesives or with hot melt Sexual fiber fusion (Wang Hong et al. [J]. High-tech fiber and application, 2010,35(4):35-38.), conductive coating coating for paper base (Yan Jinhua. [J]. Zhonghua Pa...

AI Technical Summary

Problems solved by technology

The current reported method is mainly to mechanically mix pre-synthesized conductive polypyrrole with paper fibers to prepare conductive paper, which has the problem of insoluble, infusible and difficult to process polypyrrole.

In addition, because polypyrrole is hydrophobic and fiber is hydrophilic, the binding force between the two is very weak, which also leads to the problem of "powder dropping"

In recent years, studies have found that the deposition of polypyrrole on the surface and interior of fiber / paper by in-situ polymerization can not only endow fiber / paper with excellent electrical conductivity, but also avoid the problem of difficult processing, and at the same time improve the adhesion between fiber and polypyrrole. Adhesion, but the oxidant, acid, etc. used in the in-situ polymerization process destroy the fiber, resulting in a decrease in the strength of the paper, and the electrical conductivity and mechanical properties need to be further improved

Zhang Zhaolin et al. ([J]. Heilongjiang Papermaking, 2016,44(2):7-10.) used in-situ chemical polymerization to adsorb and polymerize pyrrole monomers on the pulp fibers on-site in the presence of pulp fibers, and then make paper Conductive paper with lower resistance and better flame retardancy can be obtained, but the strength of the paper is reduced

CN103205914A Carry out aniline polymerization reaction with raw paper as base material to prepare the conductive polymer composite conductive paper with lower resistance and better strength retention, but at least one paper reinforcing agent (melamine-formaldehyde resin, urea-formaldehyde resin or urea-formaldehyde resin or polyamide epichlorohydrin) to maintain paper strength

However, the above methods all prepare conductive fibers by in-situ polymerization first, and then make them into paper. Not only the water consumption in the preparation process is large, but also the amount of monomers and other chemicals is large. More importantly, the conductivity and tensile strength of the conductive paper Intensity is still low

Images