Preparation method of PDAC with serialized relative molecular mass and high monomer conversion rate

Abstract

The invention discloses a preparation method of PDAC with serialized relative molecular mass and high monomer conversion rate. According to the method, an industrial product DAC solution is used as araw material, and under a nitrogen atmosphere, a metal ion chelating agent and triallylamine hydrochloride containing a terminal double bond having an average degree of polymerization of 0 to 180 or an oligomer thereof are added, the monomer initial mass fraction ranges from 30.0% to 60.0%, a corresponding water-soluble azo initiator accounts for 0.85%-0.06% by mass of the monomer, and by means oftemperature programmed initiation, heat preservation and curing, a PDAC colloid product with increasing serialized relative molecular mass and high monomer conversion rate is obtained. The colloidalproduct is granulated and dried in a fluidized bed, PDAC dry power is obtained, the serialized relative molecular mass ranges from 2.00 dL / g to 14.00 dL / g on the basis of a characteristic viscometer,the PDAC dry powder is stable and controllable, and the monomer conversion rate is 99.50% or above.

Description

Technical field [0001] The invention relates to the technical field of preparation of water-soluble cationic polymer compounds, and relates to a preparation method of aqueous solution polymerization of polyacryloxyethyltrimethylammonium chloride (PDAC) with serialized relative molecular mass and high monomer conversion rate. Background technique [0002] Acryloyloxyethyl trimethyl ammonium chloride (DAC for short) is a water-soluble cationic monomer with special functions. Its molecule contains vinyl groups, which can carry out its own homopolymerization or with other functions. The copolymerization of sexual monomers. DAC generates homopolymer polyacryloyloxyethyl trimethyl ammonium chloride (PDAC) through free radical polymerization. The reaction equation is as follows: [0003] [0004] DAC-based polymers play an important role in applications such as petroleum exploration, papermaking, daily chemicals, biology, medicine, and water treatment, and their annual demand continues t...

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Problems solved by technology

[0010] (1) The polymerization reaction process of constant temperature polymerization is adopted. During the reaction process, the exothermic heat of the system cannot be dissipated in time, the polymerization reaction rate is not stable, and implosion polymerization is easy to occur, resulting in low characteristic viscosity of the product PDAC and high residual monomer content, that is, single The volume conversion rate is low, and it needs to be eluted with an organic solvent before use, and only a product with a characteristic viscosity is obtained, as shown in Document 1;

[0011] (2) The polymerization reaction of PDAC is changed from constant temperature polymerization to three-step temperature rise, which can realize the staged initiation and polymerization of the reaction system, promote the continuous initiation of the initiator, further consume residual monomers, and increase the intrinsic viscosity and monomer conversion rate of the product; however, There is no research on serial regulation of relative molecular weight and improvement of monomer conversion rate, such as literature 2;

[0012] (3) The initiator ammonium persulfate produces acidic components after initiation and decomposition, which reduces the pH value of the reaction solution, automatically accelerates the initiation of ammonium persulfate, and makes the initiation process unstable, thereby limiting the stability control and stability of the polymer's characteristic viscosity. Further increase in monomer conversion rate, as document 3;

[0013] (4) So far, there have been no reports on the new preparation process of PDAC dry powder products with serialized relative molecular mass (expressed by characteristic viscosity) that is stable and controllable and high monomer conversion rate

[0014] The above defects have caused so far that it is difficult to further improve the monomer conversion rate of the existing series of PDAC products with relative molecular weights by the existing process methods, and the corresponding products are not conducive to storage, transportation, application and promotion.

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