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A kind of preparation method of high relative molecular mass micro-crosslinked polydimethyldiallyl ammonium chloride

A technology of dimethyl diallyl ammonium chloride and relative molecular mass, which is applied in chemical instruments and methods, runoff/rainwater treatment, water/sludge/sewage treatment, etc. Can not be used as a flocculant and other problems to achieve strong bridging performance and good stability of the preparation process

Active Publication Date: 2021-01-15
中科乐美科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the purpose of its molecular structure design is to obtain a color-fixing agent with high color-fixing performance. The molecular weight is controlled in a low range, and the intrinsic viscosity is below 0.7dL / g, which cannot meet the relative molecular weight requirements of a flocculant.
However, when the relative molecular weight of PDMDAAC is relatively high, adding cross-linking groups between its molecular chains tends to form a hydrogel that only swells but does not dissolve in water, and cannot be used as a flocculant

Method used

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  • A kind of preparation method of high relative molecular mass micro-crosslinked polydimethyldiallyl ammonium chloride
  • A kind of preparation method of high relative molecular mass micro-crosslinked polydimethyldiallyl ammonium chloride
  • A kind of preparation method of high relative molecular mass micro-crosslinked polydimethyldiallyl ammonium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Under stirring at normal temperature, 27.1 g of tetraallyl ammonium chloride (TAAC), 27.1 g of tetraallyl ammonium chloride (TAAC), 27.1 g of tetraallyl ammonium chloride (TAAC), and 27.1 g of metal ion chelating agent diethyltrimonium chloride were successively added to 42.49 kg of industrial cationic monomer DMDAAC with a mass fraction of 70.5%. Aminopentaacetic acid sodium 1.5g and deionized water 9.38kg, and stir evenly, are mixed with reaction solution;

[0029] (2) After blowing nitrogen into the reaction solution to remove oxygen, add 90 g of azobisisobutyromidine hydrochloride and 150 g of azobisisobutyronitrile, continue stirring, and heat the evenly stirred reaction solution to 45° C. until the reaction After the system becomes viscous, stop stirring and pass nitrogen, and keep warm for 3 hours;

[0030] (3) Continue to heat up to 65°C for 6 hours of heat preservation and aging reaction to obtain a slightly cross-linked PDMDAAC colloidal product with a rel...

Embodiment 2

[0032] (1) Under stirring at normal temperature, add cross-linking agent tetraallyl ammonium chloride (TAAC) 600g, metal ion chelating agent diethyltriaminepenta to 200kg mass fraction in the industrial cationic monomer DMDAAC of 60% Sodium acetate 60g and deionized water 199kg, and stir evenly, prepare reaction solution;

[0033] (2) After blowing nitrogen gas into the reaction solution to remove oxygen, add 600 g of azobisisobutyromidine hydrochloride and 1200 g of azobisisobutyronitrile, continue stirring, and heat the evenly stirred reaction solution to 50° C. until the reaction After the system becomes viscous, stop stirring and pass nitrogen, and keep warm for 6 hours;

[0034] (3) Continue to heat up to 70°C for 24 hours of heat preservation and aging reaction to obtain a slightly cross-linked PDMDAAC colloidal product with a relative molecular mass of 1.51dL / g in terms of characteristic viscosity, about 400kg, granulate the colloidal product, and dry it at 120°C Pulve...

Embodiment 3

[0036] (1) Under normal temperature stirring state, in 500kg mass fraction, add cross-linking agent tetraallyl ammonium chloride (TAAC) 3.5g, metal ion chelating agent diethyltriamine successively in the industrial cationic monomer DMDAAC of 70% 17.5g of sodium pentaacetate and 38kg of deionized water were stirred evenly to obtain a reaction solution;

[0037] (2) After blowing nitrogen into the reaction solution to remove oxygen, add 35 g of azobisisobutyromidine hydrochloride and 350 g of azobisisobutyronitrile, continue stirring, and heat the evenly stirred reaction solution to 35°C until the reaction After the system becomes viscous, stop stirring and pass nitrogen, and keep warm for 5 hours;

[0038] (3) Continue to raise the temperature to 65°C for heat preservation and aging reaction for 12 hours to obtain a slightly cross-linked PDMDAAC colloidal product with a relative molecular mass of 3.57dL / g in terms of characteristic viscosity, about 538kg, granulate the colloida...

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Abstract

The invention discloses a method for preparing micro-crosslinked polydimethyldiallyl ammonium chloride with a high relative molecular weight. The method comprises the steps of: adopting dimethyl diallylammonium chloride industrial monomer, a cross-linking agent and a metal ion chelating agent and deionized water to prepare a reaction liquid, introducing nitrogen for oxygen removal, adding a composite initiator, then performing gradient temperature raising, maintaining the temperature, and performing a polymerization reaction and a curing reaction sequentially so as to obtain a colloidal product of the micro-crosslinked polydimethyldiallyl ammonium chloride with the high relative molecular weight; performing further granulation on the colloidal product, conducting drying, and grinding the dried product into powder to obtain the micro-crosslinked polydimethyldiallyl ammonium chloride powder with the high relative molecular weight. The polymerization reaction is carried out under the condition of a low temperature, the preparation process has good stability, and the obtained polydimethyldiallyl ammonium chloride has a high relative molecular weight and a network structure, and has excellent functions of bridging, netting and flocculation compared with linear molecules.

Description

technical field [0001] The invention relates to the technical field of pure cationic polymers, in particular to a preparation method of high relative molecular mass micro-crosslinked polydimethyldiallylammonium chloride. Background technique [0002] Cationic polymer is currently one of the most widely used water-soluble polymer categories. Especially for polymers obtained by homopolymerization of cationic monomers, because each molecular unit contains positive charges, the positive charge density is high, the water solubility is good, and at the same time, it can be combined with inorganic salts to obtain a stable composite system, so it is used in water treatment, It has a wide range of applications in oil extraction, papermaking, textiles and many other fields. The homopolymer polydimethyldiallylammonium chloride (Polydimethyldialylammonium Chloride, referred to as PDMDAAC) obtained by the ring-forming polymerization of dimethyldiallylammonium chloride (DMDAAC) itself is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F226/02C02F11/147
CPCC02F11/14C02F2103/001C08F226/02
Inventor 李潇潇陈林郑康王化田兴友
Owner 中科乐美科技集团有限公司
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