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Method for preparing alternating copolymer of maleic anhydride and vinyl acetate

A vinyl acetate and alternating copolymer technology, applied in the field of copolymerization, can solve problems such as adverse effects on human body and environment, complex reaction system, etc., and achieve the effects of low cost, simple operation process and environmental friendliness

Active Publication Date: 2010-02-10
HAINAN LITREE PURIFYING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction system of the dispersion polymerization method is relatively complicated, and toxic substances such as stabilizers and dispersants need to be used, which can easily cause adverse effects on the human body and the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] in CO 2Under the atmosphere, add 100 g of mixed monomers of maleic anhydride and vinyl acetate with a molar ratio of 1:1.1 and 4 g of azobisisobutyronitrile (AIBN) into a 1 L reactor, and seal the reactor. The temperature of the reaction kettle was raised to 35°C, the pressure was raised to 7.5MPa, the temperature was raised to 55°C after pre-dissolving for 1 hour, the pressure reached 8MPa, and the reaction was carried out at constant temperature and pressure for 12 hours. Extract and purify 3 times under the supercritical state, finally open the pressure reducing valve to exhaust, and when the non-supercritical state is reached, turn off the heating device. When the pressure in the reactor is zero and the temperature is room temperature, open the reactor to take out the powdery product, put it into a desiccator for analysis and testing. Characterization by infrared, nuclear magnetic resonance and elemental analysis shows that the copolymer has an alternating structur...

Embodiment 2

[0021] The specific operation is the same as in Example 1, the total weight of the mixed monomers is 150g, the molar ratio is 1: 1.1, the initiator is benzoyl peroxide, the consumption is 0.075g, the temperature is 65°C, the pressure is 25MPa, and the reaction time is 24h. Characterization by infrared, nuclear magnetic resonance and elemental analysis shows that the obtained copolymer has an alternating structure, a weight-average molecular weight of 50,000, and a monomer conversion rate of 82.8%.

Embodiment 3

[0023] The specific operation is the same as in Example 1, the total weight of the mixed monomers is 250g, and the molar ratio is 1: 1.05. The initiator is azobisisoheptanonitrile, and the consumption is 2.5g. The reaction pressure is 20MPa, and the reaction temperature is 70°C. It is 18h. Characterization by infrared, nuclear magnetic resonance and elemental analysis shows that the obtained copolymer has a weight average molecular weight of 20,000 and a monomer conversion rate of 87.5%.

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Abstract

The invention discloses a method for preparing alternating copolymer of maleic anhydride and vinyl acetate. The method takes supercritical carbon dioxide fluid as a polymerization reaction medium; takes the maleic anhydride and the vinyl acetate as comonomer, wherein the mole ratio of the maleic anhydride to the vinyl acetate is 1:1-1.1, and the consistency of the comonomer is 100-250 g / L; is initiated by free radical initiating agent, wherein the usage amount of the free radical initiating agent is 0.05-4% of the gross weight of the monomer, reaction temperature is 55-75 DEG C, reaction pressure is 8-30 M Pa, and reaction time is 12-24 hours; and obtaining the alternating copolymer of the maleic anhydride and the vinyl acetate. In the copolymer system of the method, the chain transfer andthe chain termination are effectively restrained to prepare the alternating copolymer of the maleic anhydride and the vinyl acetate, which has higher molecular weight and alternating structure. Because the system simultaneously has an extracting function and can obtain purer products, the method greatly simplifies post-processing procedure, has simple technical operation, is environmentally friendly, can recycle carbon dioxide, has low cost and good application prospects.

Description

technical field [0001] The present invention relates to supercritical CO 2 The copolymerization technology of different monomers in the system, in particular relates to a preparation method of an alternating copolymer of maleic anhydride and vinyl acetate. Background technique [0002] Man and Vac copolymer Polymaleic anhydride-vinyl acetate (PMV) is an important polymer fine chemical, widely used as dispersant, water quality stabilizer, scale inhibitor, drilling mud thinner, leather complex Tanning agents, etc. Because it also has an acid anhydride active group, it can be further functionalized, which greatly improves its application range. Since vinyl acetate has good compatibility with PVC, PVDF and other materials, mixing polymaleic anhydride-vinyl acetate copolymer with it can improve the hydrophilicity and bonding performance of the material, and has good plasticity for PVC . [0003] Regarding the copolymerization of Man and Vac, the reported processes mainly incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F222/06C08F2/00
CPCY02P20/54
Inventor 王建华朱宝库徐又一陈良刚
Owner HAINAN LITREE PURIFYING TECH CO LTD
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