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A kind of graft copolymer of cellulose and its derivatives and PET and its synthetic method

A technology of graft copolymer and synthesis method, applied in the field of graft copolymer of cellulose and its derivatives and PET and its synthesis, can solve the problems of long reaction time and less than 60% graft rate of CDA and PET, etc. , to achieve the effect of increasing the grafting rate, shortening the grafting time and improving the grafting rate

Active Publication Date: 2021-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reaction time of this process is as long as 3-7 days, and the grafting rate of CDA and PET is less than 60%.

Method used

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  • A kind of graft copolymer of cellulose and its derivatives and PET and its synthetic method
  • A kind of graft copolymer of cellulose and its derivatives and PET and its synthetic method
  • A kind of graft copolymer of cellulose and its derivatives and PET and its synthetic method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First, dissolve 0.0348g of ethylene glycol antimony in 10mL of ethylene glycol, add 66.4g of terephthalic acid, add 34.6ml of ethylene glycol and 6.33g of n-decyl alcohol. The reaction was carried out at 230°C under normal pressure for about 11 h until the system became transparent and the esterification reaction was completed. Then add 1.66g of trimethyl phosphate, evacuate to 5000Pa and heat up to 265°C, react for 50 minutes, stop the reaction, pour the produced product into water while it is hot, and obtain PET with a number average molecular weight of 2565.

[0038] Take 1 gram of PET with a molecular weight of 2565 and dissolve it in 10 mL of tetrachloroethane, add 0.045 g of isophorone diisocyanate, 0.1 mL of dibutyltin dilaurate and 0.04 g of 1-butyl-3-methylimidazolium dibutyl phosphate ester, and reacted at 70°C for 6 hours to obtain an isocyanate-terminated prepolymer. 1 gram of nanocrystalline cellulose with a number-average molecular weight of 50,000 was ul...

Embodiment 2

[0040] Same as Example 1, except that the monohydric alcohol adopts benzyl alcohol. The grafting rate is 50%, and the mechanical property test results of the sample film are shown in Table 1.

Embodiment 3

[0042] Same as Example 1, except that: n-nonanol is used as monohydric alcohol. The grafting rate is 47%. The mechanical property test results of the sample film are shown in Table 1.

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Abstract

The invention relates to a synthesis method of a graft copolymer of cellulose, a derivative of cellulose, and PET. The synthesis method comprises: (1) mixing terephthalic acid and ethylene glycol, carrying out a reaction in the presence of a monohydric alcohol and an esterification catalyst, and carrying out a condensation polymerization reaction at a temperature of 250-285 DEGC under a vacuum degree of 100-6000 Pa in the presence of a heat stabilizer to synthesize single-end hydroxylated PET having a molecular weight of 2000-15000; (2) dissolving the obtained PET in tetrachloroethane, addingan ionic liquid, diisocyanate and a catalyst, and carrying out a reaction for 2-6 h at a temperature of 60-80 DEGC to obtain an isocyanate-terminated prepolymer solution; and (3) ultrasonically dissolving cellulose and a derivative thereof in tetrachloroethane, adding to the isocyanate-terminated prepolymer solution, and carrying out a reaction for 2-48 h, and purifying to obtain the graft copolymer. According to the present invention, the obtained graft copolymer and the preparation method have characteristics of short time, high grafting rate, significantly increased elongation at break of the grafted product film, and the like.

Description

technical field [0001] The invention belongs to the field of macromolecular polymers, and in particular relates to a graft copolymer of cellulose and its derivatives and PET and a synthesis method thereof. Background technique [0002] With the continuous development of science and technology and the massive consumption of petroleum resources, people focus more on sustainable development resources, bio-based materials have entered people's sight, and more and more cellulose and its derivative materials are being used by people. Develop new materials to replace petroleum derivative materials. Cellulose resources are the most abundant biodegradable natural polymer materials on the earth, which can be degraded by microorganisms in the natural environment. Therefore, making full use of cellulose resources is of great significance for the sustainable development of human society. [0003] Polyethylene terephthalate (PET) is widely used around the world due to its high strength, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/64C08G18/42C08G18/10C08G63/20
Inventor 白富栋郎美东侯佳梁文城方向晨李政张通薛冬
Owner CHINA PETROLEUM & CHEM CORP
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