Preparation method of poly dialkyl diallyl ammonium halide

Abstract

The present invention discloses preparation process of polyammonium dialkyldiallyl halide. By using ammonium dialkyldiallyl halide with high purity as material, and through adding initiator and complexing agent at relatively low temperature and stepped temperature raising for slow polymerization and high temperature curing, polyammonium dialkyldiallyl halide with relatively high molecular weight is prepared. The molecular weight is regulated through regulating the initial monomer content and initiator amount in the reaction system. The process has industrial application foreground, high technological stability, easy operation and other advantages, and the product has relatively high molecular weight.

Description

technical field [0001] The invention belongs to the preparation technology of cationic homopolymerization products, in particular to a preparation method of polydialkyl diallyl ammonium halide. Background technique [0002] Polydialkyl diallyl ammonium halide is a kind of cationic polyquaternary ammonium salt, its molecular structure and preparation reaction formula are as follows: [0003] [0004] In the formula, n=2, 3, 4, ... n; m = 2, 3, 4, ... m. Among them, R is preferably a hydrogen atom or C 1～18 The alkyl group, Y is preferably halogen F, Cl, Br and I. In this class of compounds, polydimethyldiallyl ammonium chloride (Poly-Dimethyldiallyl ammonium chloride, referred to as PDMDAAC) is one of the most ideal cationic polyquaternary ammonium salts. PDMDAAC is a water-soluble linear polymer with cationic groups on its molecular chain, and it is also a cationic polyelectrolyte. PDMDAAC is a white easily absorbent powder, soluble in water, methanol and glacial acet...

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Problems solved by technology

Since the influence of operating conditions on the intrinsic viscosity of the product is not obvious, the intrinsic viscosity of the product obtained by the polymerization process does not have serial controllable characteristics (documents 1, 2);

[0013] (3) Adopt high temperature reflux at 105-115°C, continuously drop the initiator method or adopt a process method from 40°C to 60°C, and then react for 72 hours after reaching 40°C, the resulting polymerization process conditions are relatively harsh and complicated , industrialization is more difficult (document 2, 3);

[0014] (4) In the preparation process of PDMDAAC published so far, without exception, the amount of impurities in the monomer solution used that affects the free radical polymerization reaction cannot be explained

As a result, even if the relative molecular weight of the reaction product PDMDAAC can be regulated within a certain range by such as the initial concentration of monomers, the amount of initiators, and the amount of auxiliary agents, but also because of the different sources and batches of monomers, the selected specific process conditions It is necessary to make relative adjustments by trying each time (such as documents 1-3)

The above-mentioned defects have made it difficult to obtain a stable process method that can prepare high relative molecular mass PDMDAAC products and the relative molecular mass of the products can be serially controlled by the existing methods.

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