A modifying method of soft wollastonite fibers

Abstract

The invention belongs to the field of inorganic mineral fibers and particularly relates to a modifying method of soft wollastonite fibers. The method is characterized in that the soft wollastonite fibers are prepared by adding wollastonite fibers into a sodium hydroxide solution, performing alkaline treatment to allow surfaces of the wollastonite fibers to be in a honeycomb microcellular structure, adding polydimethylsiloxane, stirring, mixing to obtain the modified wollastonite fibers, subjecting the modified wollastonite fibers, polyethyleneimine and polymaleic acid to gamma-ray radiation under functions of an initiator to allow the polymaleic acid and the polyethyleneimine to be subjected to copolymerization and to be grafted to the surfaces of the wollastonite fibers, and adding a cationic surface modifying agent for surface covering. Surface activity of the wollastonite fibers can be improved through the method, softness and dispersity of the wollastonite fibers are improved, and bonding force between the wollastonite fibers and plant fibers is increased. The soft wollastonite fibers are capable of obviously improving softness of paper and allowing paper to be good in hand feel and light in weight when the soft wollastonite fibers are used for papermaking.

Description

technical field [0001] The invention belongs to the field of inorganic mineral fibers, in particular to a method for modifying flexible wollastonite fibers. Background technique [0002] The paper industry plays an important role in the global economy and civilization, and its output value accounts for 2.5% of the world's total industrial output value and 2% of the world's total trade. Wood is the main raw material of the papermaking industry, accounting for more than 93% of the papermaking raw materials. With the rapid development of the papermaking industry, large-scale deforestation has been caused, the forest area of ​​the world has decreased sharply, desertification has intensified, and it has also brought serious pollution to the environment. , affecting human health. At present, the total amount of paper production in our country is constant, and there is a serious shortage of paper raw materials, which forces us to actively look for cheap pulp fiber substitutes. Si...

AI Technical Summary

Problems solved by technology

[0005] In summary, the current modification method for wollastonite fiber is mainly to use cationic modifiers for surface modification, although the compatibility between wollastonite fiber and plant fiber has been improved to a certain extent, and the mineral fiber has been improved. The retention rate in the papermaking process, but because there are few active groups on the surface of wollastonite mineral fibers, the combination with cationic modifiers is limited, increasing the amount of modifiers and reducing the amount of modifiers ; At the same time, the addition of simple cation-modified wollastonite fibers will have a certain degree of adverse effects on the paper-forming properties, especially the strength index, while increasing the ash content of the paper.