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Pre-irradiation polypropylene graft copolymer and preparation method thereof

A technology of polypropylene grafting and pre-irradiation, which is applied in the field of pre-irradiation polypropylene graft copolymers and its preparation, can solve the problems of degradation of mechanical properties of materials, and achieve small bulk loss, low reaction temperature and mild method Effect

Inactive Publication Date: 2011-06-29
TECHN PHYSICS INST HEILONGJIANG ACADOF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the deterioration of the mechanical properties of materials due to residual peroxides or high-temperature degradation, exploring methods to improve surface properties has always been a research hotspot in the field of polypropylene modification.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] About 3g of polypropylene resin after constant weight at 60°C is used 60 Co radiation source or DD-1.2 / 1.0-800 high-frequency high-voltage electron accelerator (manufactured by Shanghai Pioneer Electric Factory, China) was pre-irradiated in air at a dose rate of 300 Gy / min and a dose of 3 kGy. The pre-irradiated polypropylene resin was added to a 250ml three-necked bottle containing methylidene bisacrylamide, auxiliary monomers and additive solutions, and the solution volume was 100ml, including 75mg of methylidene bisacrylamide, 15mg of acrylamide, and 0.1 of acrylic acid. ml, the molar concentration of the additive is 1.0 × 10-3 M. After the mixture was filled with nitrogen and deoxygenated for 30 minutes, it was heated to 50°C for 6 hours under the conditions of magnetic stirring, nitrogen protection and reflux. The filtered polypropylene resin was washed twice with ethanol and water, and then pumped with ethanol-water solution. Lift for 24 hours, dry at 60°C ...

Embodiment 2

[0025] About 3g of polypropylene resin after constant weight at 60°C is used 60 Co radiation source or DD-1.2 / 1.0-800 high-frequency high-voltage electron accelerator (manufactured by Shanghai Pioneer Electric Factory, China) was pre-irradiated in air at a dose rate of 300 Gy / min and a dose of 5 kGy. The pre-irradiated polypropylene resin was added to a 250ml three-neck bottle containing methylidene bisacrylamide, auxiliary monomers and additive solutions, and the solution volume was 100ml, wherein about 75mg of methylidene bisacrylamide and about 15mg of acrylamide, Acrylic acid is about 0.1ml, and the molar concentration of the additive is 1.0×10-3 M. After the mixture was filled with nitrogen and deoxygenated for 30 minutes, it was heated to 50°C for 6 hours under the conditions of magnetic stirring, nitrogen protection and reflux. The filtered polypropylene resin was washed twice with ethanol and water, and then pumped with ethanol-water solution. Lift for 24 hours,...

Embodiment 3

[0027] About 3g of polypropylene resin after constant weight at 60°C is used 60 Co radiation source or DD-1.2 / 1.0-800 high-frequency high-voltage electron accelerator (manufactured by Shanghai Pioneer Electric Factory, China) was pre-irradiated in air at a dose rate of 300 Gy / min and a dose of 15 kGy. The pre-irradiated polypropylene resin was added to a 250ml three-neck bottle containing methylidene bisacrylamide, auxiliary monomers and additive solutions, and the solution volume was 100ml, wherein about 75mg of methylidene bisacrylamide and about 15mg of acrylamide, Acrylic acid is about 0.1ml, and the molar concentration of the additive is 1.0×10-3M. After the mixture was filled with nitrogen and deoxygenated for 30 minutes, it was heated to 50°C for 6 hours under the conditions of magnetic stirring, nitrogen protection and reflux. The filtered polypropylene resin was washed twice with ethanol and water, and then pumped with ethanol-water solution. Lift for 24 hours,...

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Abstract

The application relates to a pre-irradiation polypropylene graft copolymer and a preparation method thereof. At present, the exploration of methods for improving surface property remains a research hotspot in the field of modification of polypropylene always. The method comprises the following steps: performing pre-irradiation on polypropylene resin after having constant weight at the temperature of 60 DEG C by using a 60 Co radiation source or a DD-1.2 / 1.0-800 type high-frequency high-pressure electron accelerator in air, keeping the dosage rate at 300Gy / min, keeping the dose at 3-50kGy, adding the pre-radiated polypropylene resin into solution containing N, N'-methylenebis acrylamide, auxiliary monomers and additives, keeping the using amount of the N, N'-methylenebis acrylamide to be 0.5-5% by weight of the weight of polypropylene, performing nitrogen filling and oxygen removal on mixed solution for 30 minutes, then heating to 50-75 DEG C for performing reaction for 6 hours under magnetic stirring, nitrogen production and reflux conditions, washing the polypropylene resin which is filtered out with ethanol-water twice, further extracting with ethanol-water solution for 24 hours, drying at the temperature of 60 DEG C and enabling the weight to be constant. The method is used for preparing the polypropylene graft copolymer.

Description

technical field [0001] The invention relates to a pre-irradiated polypropylene graft copolymer and a preparation method thereof. Background technique [0002] Polypropylene (PP) is one of the most widely used and fastest growing resins in the world. Compared with other thermoplastic resins, PP has the advantages of low density, high melting point, wide source, low price, superior mechanical properties, and good chemical stability. PP has become indispensable for industries such as packaging, light industry, electronics, electrical appliances, and automobiles. basic raw materials. However, PP is a non-polar semi-crystalline polymer with low surface energy and is difficult to paint, which greatly limits the application of polypropylene in daily use, architectural decoration, and automotive interior and exterior decorations. [0003] At present, the modification methods of polypropylene are mainly reactor method and post-reactor method. [0004] The reactor method is to copo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F222/38C08F220/56C08F220/06C08F2/46C08F2/54
Inventor 刘宇光侯静董伟张成武赵大晔
Owner TECHN PHYSICS INST HEILONGJIANG ACADOF SCI
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