Method for carrying out solid-phase grafting modification on polypropylene by assistance of supercritical carbon dioxide

A technology of carbon dioxide and solid phase grafting, applied in the production of bulk chemicals, etc., can solve problems such as high reaction pressure, environmental pollution, solvent recovery, etc.

Inactive Publication Date: 2013-01-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method of using supercritical carbon dioxide as a swelling agent and a carrier to swell and assist solid-phase graft modification of polypropylene, using a two-step method of swelling and grafting respectively to overcome the existing problems in the prior art. High reaction pressure, solvent recovery, environmental pollution, low grafting efficiency, uneven grafting and serious degradation of grafted products, etc.

Method used

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  • Method for carrying out solid-phase grafting modification on polypropylene by assistance of supercritical carbon dioxide
  • Method for carrying out solid-phase grafting modification on polypropylene by assistance of supercritical carbon dioxide
  • Method for carrying out solid-phase grafting modification on polypropylene by assistance of supercritical carbon dioxide

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Embodiment 1

[0023] Embodiment 1 prepares PP-g-BA

[0024] Polypropylene, butyl acrylate (BA) and initiator azobisisobutyronitrile (AIBN) are placed in the autoclave according to the mass ratio of 100 / 4 / 0.3 and 100 / 6 / 0.3 respectively, and put into the preset In the constant temperature water bath with high temperature, first fill the low-pressure carbon dioxide to replace the air in the kettle, and then use the high-pressure pump to inject carbon dioxide to the specified pressure. The swelling temperature is controlled at 41°C and the swelling pressure is 8.1MPa. After swelling for 4 hours, the autoclave was taken out, cooled with ice water, and the pressure was slowly released. Transfer the swollen polypropylene to the reactor, add the interface agent xylene at a ratio of 1% by weight to the polypropylene, pass in nitrogen, react at 80°C for 2 hours, cool the reactor, and take out sample 2 No. and No. 3 were purified, dried, and the grafting rate was calculated and characterized.

[00...

Embodiment 2

[0031] Weigh 100.0g of polypropylene with mixed particle size, add 1.0% initiator AIBN, BA is 10%, fill with CO at a temperature of 41°C 2 , the swelling pressure was 8.6MPa, and the swelling was 4h; the grafting reaction time was 2h, and the reaction temperature was 78°C; it was purified and dried, and the calculated grafting rate was 4.56%. The measured MFR of the product is 2.9g·10min -1 , the tensile strength is 34.2MPa, and the elongation at break is 680%.

Embodiment 3

[0033] Weigh 100.0g polypropylene with mixed particle size, add 0.3% initiator AIBN, AA is 5%, fill with CO under the pressure of 8.1MPa 2 , swelling for 4h, the temperature is 35°C; the grafting reaction time is 2.5h, the reaction temperature is 80°C; purification, drying, the calculated grafting rate is 2.04%.

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Abstract

The invention relates to a method for carrying out solid-phase grafting modification on polypropylene by assistance of supercritical carbon dioxide. The method comprises the following steps of: swelling the polypropylene for 0.5-10 hours in the supercritical carbon dioxide dissolved with vinyl monomer and an initiating agent, and then slowly releasing pressure; transferring the swelled polypropylene into a reaction kettle, adding interfacial dimethylbenzene according to the mass ratio with the polypropylene of being 1%, rising the temperature to 65-165 DEG C under normal pressure, and reacting for 1-10 hours to obtain a target product, wherein the swelling and penetrating temperature in the swelling process is 31-60 DEG C, and the swelling pressure is 7.5-12MPa; the initiating agent is an azo compound or peroxide, and the mass of the initiating agent is 0.1-5.0% of the mass of the polypropylene; and the mass of the vinyl monomer is 0.2-20% of the mass of the polypropylene. According to the method, the grafting rate reached 5.40%, and the grafting efficiency is over 90%. According to the method, the thermal property, the polarity and the mechanical property and the like are obviously improved and the hydrophilcity is obviously improved.

Description

technical field [0001] The invention relates to a method in which supercritical carbon dioxide is used as a swelling agent and a carrier to assist vinyl monomers in solid-phase grafting and modifying polypropylene. Background technique [0002] Polypropylene (PP) has become one of the most promising thermoplastic polymer materials due to its high strength, good heat resistance, low density, easy processing and low cost. However, due to its non-polar structure, poor hydrophilicity, dyeability, antistatic properties, adhesion and printing properties, it is difficult to blend with polar polymers and inorganic fillers, thus limiting the application of PP in many fields. An effective way to overcome these disadvantages is to introduce polar groups into the PP skeleton, among which grafting modification with monomers containing polar groups is the simplest and easy to do, and has attracted widespread attention. [0003] The method usually used to modify PP is supercritical CO 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F220/18C08F220/06C08F212/08C08F220/14C08F222/06C08F222/08
CPCC08F222/06C08F220/06C08F255/02C08F212/08C08F220/14C08F220/18C08F222/08Y02P20/54C08F220/1804
Inventor 王文燕王鉴张明强邹恩广王登飞马建英邱丽萍董群吴林美姜进宪葛腾杰郭桂悦安彦杰张德英李波王世华杜威任鹤张占宾闫兵梁忠越景丽荣田炳全国海峰景常荣
Owner PETROCHINA CO LTD
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