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A kind of method for graft copolymerization of starch and vinyl monomer

A vinyl monomer and starch technology, which is applied in the field of preparation of starch and vinyl monomer graft copolymers, can solve the problems of high viscosity, difficult mass transfer, low solid content, etc., and achieve uniform molecular weight distribution and mass transfer Ease of heat transfer and the effect of improving adsorption performance

Inactive Publication Date: 2011-12-14
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional method of graft copolymerization of starch and water-soluble monomer is aqueous solution polymerization [5，6] , but in the process of polymerization, due to the relatively high viscosity of the system and the difficulty of mass transfer in this method, only products with low solid content can be prepared, and the utilization rate of equipment is low. In addition, the products are not easy to separate and dry, and there are inconveniences in transportation when used directly. question [7] Therefore, in recent years, people have begun to study the preparation of starch-based graft copolymers by inverse emulsion polymerization. [8，9] , this method can increase the solid content of the product, but due to the use of organic solvents, it increases the environmental burden and easily causes secondary pollution

Method used

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  • A kind of method for graft copolymerization of starch and vinyl monomer
  • A kind of method for graft copolymerization of starch and vinyl monomer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] ①Add a predetermined amount of cornstarch to the reactor, press m 淀粉 / m 丙烯酰胺 Add acrylamide at a ratio of 1.2 / 1, use ammonium persulfate / urea as the redox initiation system, press m 过硫酸铵 / m 尿素 1 / 5, m 过硫酸铵 / m 丙烯酰胺 Add the initiator at a ratio of 0.005 / 1, then add water equal to the total mass of the reactants, and stir evenly;

[0034] ②Raise the temperature of the reactor to 55°C under stirring;

[0035] ③ After sealing the system, inject carbon dioxide until the pressure reaches 8MPa;

[0036] ④ After 3.0 hours of constant temperature reaction, the reaction was completed to obtain a graft copolymer of starch and acrylamide.

Embodiment 2

[0038] ①Add a predetermined amount of potato starch into the reactor, press m 淀粉 / m 丙烯酸 Add moderately neutralized acrylic acid in a ratio of 2 / 1, use ammonium persulfate as the initiator, press m 过硫酸铵 / m 丙烯酸 Add the initiator at a ratio of 0.003 / 1, then add water equal to the total mass of the reactants, and stir evenly;

[0039] ②Raise the temperature of the reactor to 60°C under stirring;

[0040] ③ After sealing the system, inject carbon dioxide until the pressure reaches 24MPa;

[0041] ④ After 2.5 hours of constant temperature reaction, the reaction was completed to obtain a graft copolymer of starch and acrylic acid.

Embodiment 3

[0043] ①Add a predetermined amount of tapioca starch into the reaction kettle, press m 淀粉 / m 甲基丙烯酸 Add methacrylic acid at a ratio of 1.4 / 1, and use potassium permanganate / sulfuric acid as the initiation system, press n 高锰酸钾 / n 硫酸 1 / 5, m 高锰 酸钾 / m 甲基丙烯酸 Add the initiator at a ratio of 0.0007 / 1, then add water equal to the total mass of the reactants, and stir evenly;

[0044] ②Raise the temperature of the reactor to 40°C under stirring;

[0045] ③ After sealing the system, inject carbon dioxide until the pressure reaches 16MPa;

[0046] ④ After 1.5 hours of constant temperature reaction, the reaction was completed to obtain a graft copolymer of starch and methacrylic acid.

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Abstract

The invention is relates to a method for grafting copolymerization of starch and a vinyl monomer. The invention is characterized in that the starch is taken as a substrate, vinyl monomer acrylamide, acrylic acid, acrylic acid ester, N,N-dimethyl diallyl ammonium chloride and the like are taken as a grafting copolymerization monomer, the graft copolymer of the starch and vinyl monomer can be obtained by adding an initiator to perform a grafting copolymerization reaction in a supercritical carbon dioxide system. Compared with the traditional technology of grafting copolymerization, the technology of the present invention overcomes the defect of low effective concentration of a traditional solution and obtains the high solid content, on the other hand, the defect of environmental pollution caused by using an anti-phase emulsion polymerization method can be overcome due to no organic solvent employed in the reaction process. The obtained grafting copolymerization product is in a looseningporous structure due to the existence of the supercritical carbon dioxide, the grafting copolymerization product is capable of easily dissolving which brings great convenience when the grafting copolymerization product is taken as a flocculating agent, and the grafting copolymerization product provides the materials with large adsorption potential due to the existence of a plurality of pores whenthe grafting copolymerization product is taken as a material for absorbing water and oil.

Description

technical field [0001] The invention relates to the fields of environmental protection, pesticides and oil exploitation, in particular to a preparation method of a starch-vinyl monomer graft copolymer. Background technique [0002] The graft copolymerization product of starch and vinyl monomer has the advantages of wide source of raw materials, renewable and degradable, etc. It is used as flocculant, oil-absorbing material, water-absorbing material, tertiary oil recovery aid, Sludge dewatering agent, etc. [1-4] , can replace synthetic polymer products to a certain extent, and reduce the environmental burden. [0003] The traditional method of graft copolymerization of starch and water-soluble monomer is aqueous solution polymerization [5，6] , but in this method, due to the relatively high viscosity of the system and the difficulty of mass transfer during the polymerization reaction, only products with low solid content can be prepared, and the utilization rate of equipment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F2/00
CPCY02P20/54
Inventor 刘兆丽王舒婷曹亚峰李沅谭凤芝
Owner DALIAN POLYTECHNIC UNIVERSITY
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