Commercial products are usually 20% ~ 50% aqueous solutions. The degree of polymerization used in paper industry is about 100, and its aqueous solution is positive. The pH value of 5% aqueous solution is 8 ~ 1 1, and it will gel when it meets acid.
Polyethylenimine has high reactivity, can react with hydroxyl groups in cellulose, cross-link and polymerize, and make paper produce wet strength, which has dry strengthening effect. The existence of any acid, alkali and aluminum sulfate will affect its wet strength and retention rate.
Mainly used as wet strength agent for non-sized absorbent paper (such as filter paper, blotting paper, toilet paper, etc.). ), but its damaged paper is difficult to handle. In addition, it can speed up the filtration of pulp and make the fine fibers in white water flocculate easily.
It has a strong binding force to acid dyes and can be used as a fixing agent when dyeing paper with acid dyes. It can also be used to treat cellophane to reduce the wetting deformation of paper. Polyethylenimine can also be used in fiber modification, printing and dyeing auxiliaries, ion exchange resin, coagulation and sedimentation (metal capture, wastewater treatment) and so on.
Polyether imide is a super engineering plastic made of amorphous polyether imide, which has the best high temperature resistance and dimensional stability, as well as chemical resistance, flame retardancy, electrical properties, high strength and high rigidity. PEI resin can be widely used in high-temperature terminals, IC bases, lighting equipment, FPCB, liquid conveying equipment, aircraft internal parts, medical equipment and household appliances.