Novel positive ion fixative preparing method

Abstract

The invention discloses a novel positive ion fixative preparing method. The novel positive ion fixative preparing method comprises the following steps that mixing is conducted by using dimethylamine as the main raw material, using hexamethylenediamine and dimethylamino-ethyl methylacrylate as auxiliary materials and using water as solvent, so that a mixed monomer is formed, wherein the molar ratio of the hexamethylendiamine to the dimethylamine is 0.01-0.5:1; epoxy chloropropane is dripped into the mixed monomer in the first step, so that a pre-polymerized monomer is formed, wherein the molar ratio of the epoxy chloropropane to the mixed monomer is 0.5-4:1, and the reaction temperature is controlled between 10 DEG C and 60 DEG C; after dripping is completed, the temperature is kept between 70 DEG C and 95 DEG C, and water is added and the reaction is ended when the viscosity is increased to 300-1000 cps; inorganic acid and water are added into an obtained product, and the pH value is adjusted to be 3-5. According to the novel positive ion fixative preparing method, the reaction condition is mild, the reaction yield is high, and sudden polymerization caused by direct polymerization is avoided; in addition, the electric charge density is higher than that of similar products in China and foreign counties by 10%, the production cost is low, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of a fixing agent, in particular to a preparation method of an anionic garbage catcher used in papermaking. Background technique [0002] The fixation agent is commonly known as anionic trash catcher, and its English name is anionic trash catcher, referred to as ATC or fixative. It is a kind of linear low molecular weight polymer with high positive charge density. [0003] Since the 20th century, the papermaking industry has developed rapidly, especially the changes in the structure of papermaking raw materials, which have increased the aggregation degree and concentration of disturbing anions in the wet end of the paper machine, resulting in frequent paper breaks in the papermaking system and paper defects. , and the continuous operation time is short and the production volume is reduced. The way to reduce the impact of anionic trash in the papermaking system is to pretreat the pulp with an anionic trash ...

AI Technical Summary

Problems solved by technology

[0003] Since the 20th century, the papermaking industry has developed rapidly, especially the changes in the structure of papermaking raw materials, which have increased the aggregation degree and concentration of disturbing anions in the wet end of the paper machine, resulting in frequent paper breaks in the papermaking system and paper defects. , and the continuous operation time is short and the production volume is reduced

[0005] Fixing agents are usually formed by ring-opening polymerization of cationic monomers and epichlorohydrin. The activation energy required for the preparation of fixing agents is generally low and can be carried out at room temperature, but the finished product does not need too high molecular weight. The formation of too large molecular weight polymers leads to The product has a low charge density and loses the ability to capture anionic garbage, so the reaction conditions must be strictly controlled in order to prevent the reaction from violent aggregation