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Graft copolymers of cellulose and/or derivatives thereof with PET

A technology of graft copolymer and cellulose, which is applied in the field of graft copolymer of cellulose and/or its derivatives and PET, which can solve the problem that the molecular weight of the product cannot be accurately controlled by the end-capping agent, so as to achieve excellent results and avoid cross-fertilization. Link reaction, reduce the effect of side reaction

Active Publication Date: 2021-07-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the graft copolymer of cellulose and PET cannot be accurately controlled by the end-capping agent in the preparation process of the prior art, the present invention provides a graft copolymer of cellulose and PET and its preparation method , by using monobasic acid as a capping agent, the above problems are solved

Method used

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  • Graft copolymers of cellulose and/or derivatives thereof with PET
  • Graft copolymers of cellulose and/or derivatives thereof with PET
  • Graft copolymers of cellulose and/or derivatives thereof with PET

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0050] Graft polymers of cellulose CDA and PET were prepared in Examples 1-8:

Embodiment 1

[0052] (1) Preparation of PET with single-terminal hydroxyl groups: Mix terephthalic acid (PTA) and ethylene glycol (EG) at a molar ratio of 1:1.5, and add end-capping agent p-toluic acid and esterification catalyst ethylene glycol at the same time Antimony and heat stabilizer triphenyl phosphate, the molar ratio of p-toluic acid and terephthalic acid is 0.025:1, ethylene glycol antimony and triphenyl phosphate are 0.05% and 0.05% by weight of terephthalic acid respectively 3.0%; first raise the temperature to 235°C for esterification reaction, then rise to 265°C, keep the vacuum at 1000Pa and carry out the pre-condensation reaction for 60min, then raise the temperature to 285°C, adjust the vacuum degree to 100Pa and carry out the polycondensation reaction for 25min, and synthesize The product was first dissolved in hexafluoroisopropanol and then dried by settling with acetone to obtain purified single-terminal hydroxylated polyethylene terephthalate (PET).

[0053] (2) Prepar...

Embodiment 2

[0060] (1) Preparation of PET with single-terminal hydroxyl groups: Mix terephthalic acid (PTA) and ethylene glycol (EG) at a molar ratio of 1:1.5, and add end-capping agent m-toluic acid and esterification catalyst ethylene glycol at the same time Antimony and heat stabilizer triphenyl phosphate, the molar ratio of m-toluic acid and terephthalic acid is 0.025:1, ethylene glycol antimony and triphenyl phosphate are 0.05% and 0.05% by weight of terephthalic acid respectively 3.0%; first heat up to 230°C for esterification reaction, then carry out precondensation reaction at 265°C for 60 minutes under vacuum of 1000 Pa, then heat up to 285°C for 25 minutes under vacuum of 100 Pa for polycondensation reaction to synthesize single-terminal hydroxylated polymer Ethylene terephthalate (PET), and the synthesized product was first dissolved in hexafluoroisopropanol and then dried with acetone to obtain purified PET.

[0061] (2) Preparation of graft polymer CDA-g-PET: Dissolve the PET...

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Abstract

According to the graft copolymer of cellulose and / or derivatives thereof and PET, at least one of m-toluic acid or p-toluic acid is adopted as an end-capping reagent to prepare single-end hydroxylated PET, and then an isocyanate-terminated prepolymer is obtained in the presence of an ionic liquid, diisocyanate and an organic tin compound; and reacted with cellulose and / or a derivative thereof to obtain the grafted copolymer. According to the invention, monobasic acid is adopted as an end-capping reagent, generation of subsequent cross-linking reaction can be effectively avoided, purification of synthesized PET can effectively reduce side reaction in the presence of ethylene glycol, synthesis of a graft copolymer is facilitated, on the one hand, monobasic acid can completely participate in the reaction and can be used for quantitative regulation and control of molecular weight, and the PET with uniform molecular weight and target molecular weight can be conveniently obtained.

Description

technical field [0001] The invention relates to the technical field of polymer polymerization, in particular to a graft copolymer of cellulose and / or its derivatives and PET. Background technique [0002] Cellulose and its derivatives are commonly used raw materials in nature, and their application fields are very wide. For example, CDA (cellulose diacetate) is one of the earliest commercialized cellulose derivatives of cellulose. It has the advantages of good toughness, degradability and abundant sources. It is widely used in textiles, cigarette filters, filter membranes and other fields. The CDA fiber obtained after spinning has a series of advantages such as soft hand feeling and easy dyeing, etc., but its low strength and poor wear resistance limit the development and application of CDA fiber. The molecular chain of PET (polyethylene terephthalate) is highly symmetrical and has strong crystallization ability. PET has excellent electrical insulation and chemical corrosio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G63/20C08G63/86
CPCC08G81/00C08G63/20C08G63/866Y02P20/54
Inventor 白富栋郎美东高菲菲侯佳方向晨张通白毓黎
Owner CHINA PETROLEUM & CHEM CORP