Method for water phase grafting polymerization of non-water soluble monomer

A polymerization method and non-water-soluble technology, applied in the field of graft polymerization, can solve the problems of post-processing difficulties, affecting product quality and performance, etc., and achieve the effects of simplifying post-processing procedures, reducing recycling and processing costs, and reducing pollution

Inactive Publication Date: 2011-07-27
SHANGHAI JIJIA BUILDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: when the existing water-insoluble monomers are subjected to pre-radiation graft polymerization in the water phase, emulsifiers and organic solvents need to be added, which makes the post-treatment of the reaction difficult, and the remaining emulsifiers It may also affect the quality and performance of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 20 grams of polypropylene (number-average molecular weight: 400,000) (PP) particles with an electronic balance, and irradiate to 10 kGy in air with a cobalt 60 gamma ray source with a particle diameter of 2 mm. Put the irradiated powder into a 200ml Erlenmeyer flask, and add 80ml of deionized water, 20ml of acrylonitrile, 0.1g of ferrous ammonium sulfate, and 1ml of dilute sulfuric acid (1mol / L) in sequence. The system was aired with nitrogen for 20 minutes to remove oxygen, then sealed, and placed in a 75°C water bath for 3 hours under magnetic stirring. After the reaction is finished, the grafted polypropylene powder is obtained by filtration, and the filtrate is recovered. After the powder was dried in the air, it was extracted with N, N-dimethylformamide (DMF) for 72 hours to remove the acrylonitrile homopolymer, and then the grafted polypropylene powder was vacuum-dried at 60 degrees Celsius to a constant weight, weighed Obtain 24 grams of polyacrylonitrile-...

Embodiment 2

[0025] Weigh 150 grams of polyvinylidene fluoride (number-average molecular weight: 600,000) (PVDF) powder with an electronic balance, with a particle size of 10 microns, and irradiate it to 15 kGy with an electron beam in nitrogen. Put the irradiated powder into a 500 ml three-necked flask, and add 100 ml deionized water, 95 ml styrene, 5 ml divinylbenzene (DVB), 1 g copper acetate, and 2 ml acetic acid in sequence. Under the action of mechanical stirring at 120 revolutions per minute, after passing nitrogen for 30 minutes to remove the oxygen in the reaction system, use an oil bath to heat the reaction system to 60 degrees, react for 5 hours, and keep the flow of nitrogen constant during the reaction. After the reaction, stop stirring, wait for the system to cool down and filter to obtain grafted polyvinylidene fluoride powder, and recover the filtrate. After the powder was dried, it was extracted with cyclohexane for 72 hours to remove the styrene homopolymer, and then vacu...

Embodiment 3

[0027]Weigh 1 kg of polyethylene powder (with a number average molecular weight of 300,000) with a bench scale and a particle size of 0.1 mm, and irradiate it to 20 kGy in air using a cobalt 60 gamma ray source. Put the irradiated powder into a 5-liter reactor, and add 3 liters of deionized water and 500 milliliters of glycidyl methacrylate (GMA) in sequence. Under the action of mechanical stirring at 90 rpm, first vacuumize for 5 minutes, and then pass nitrogen gas to remove oxygen, and control the flow rate of nitrogen gas to 20 ml to 1 liter per minute. After feeding nitrogen for 30 minutes, the reaction system was heated to 55° C. by circulating hot water in the heating jacket, and reacted for 2 hours. During the reaction, the flow of nitrogen gas was maintained. After the reaction was over, stop stirring, filter to obtain the grafted polyethylene powder, wash with hot methanol for 5 times to remove the glycidyl methacrylate homopolymer, then wash away the methanol with de...

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Abstract

The invention discloses a method for water phase grafting polymerization of a non-water soluble monomer. The method comprises the following steps of: under the inertia protection and a shearing condition, performing the grafting polymerization reaction of polymer resin powder after irradiation and the non-water soluble monomer in water. The method has the advantages of avoiding the use of organicsolvents and an emulsifying agent in the polymerizing process, along with simple post treatment, convenient recovery of the monomers, economy and environmental protection and the suitability for industrialized production.

Description

technical field [0001] The invention relates to a graft polymerization method, in particular to a water-phase graft polymerization method of a water-insoluble monomer. Background technique [0002] The radiation grafting method is an effective method for preparing grafted polymers. In the radiation grafting method, the pre-irradiation grafting technology is to irradiate the substrate to be grafted, that is, the polymer resin, under a certain atmosphere to obtain stable macromolecular free radicals, and then initiate graft polymerization outside the radiation field. Pre-irradiation grafting technology is more suitable for industrial production because it separates irradiation and graft polymerization, has simple requirements for irradiation conditions, and can use conventional thermal polymerization reaction devices for graft polymerization. Pre-irradiation grafting technology can be applied to any radiation-stable polymer resin that can generate trapped free radicals or mac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F291/18C08F2/16
Inventor 李景烨邓波谢雷东虞鸣李林繁吉玉玲杨璇璇
Owner SHANGHAI JIJIA BUILDING MATERIAL
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