Preparation method of poly dialkyl diallyl ammonium halide

Abstract

The invention discloses a preparation method of polydialkyl diallyl ammonium halide. It uses the monomer dialkyldiallyl ammonium halide produced by the high-purity industrial one-step method with known main impurity content as the raw material. A step-by-step method of slowly initiating polymerization and high-temperature aging to increase the relative molecular mass of the product polydialkyl diallyl ammonium halide. At the same time, only by adjusting the initial monomer content and the amount of initiator in the reaction system to control the relative molecular weight of the product to achieve serialization. The invention has industrial application prospects, and because the polymerization reaction is less affected by impurities, the preparation process has good stability; the initiation temperature is lowered, and the polymerization reaction is easy to operate at a lower temperature; the rate of decomposition and initiation of the initiator is controlled, and the polymerization The reaction proceeds smoothly at a lower initiator concentration, and it is easy to obtain polydialkyldiallyl ammonium halide products with higher relative 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 initiator method or adopt from 40°C to 60°C, and then react for 72 hours after 40°C, the resulting polymerization process conditions are relatively harsh and complicated, Industrialization is difficult (documents 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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