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A kind of graft copolymer of cellulose and its derivatives and its synthesis method

A technology of graft copolymer and synthesis method, which is applied in the field of polymer polymerization, can solve the problems that the graft copolymer is not suitable for blending cellulose and PET, and is not suitable for aromatic polyester graft copolymer, so as to improve the two The effect of compatibility, good guidance and application value, and high grafting rate

Active Publication Date: 2019-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned preparation method uses aliphatic polyester, which is not suitable for the preparation of aromatic polyester (PET) graft copolymer, and the prepared graft copolymer is also not suitable for the blending of cellulose and PET.

Method used

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  • A kind of graft copolymer of cellulose and its derivatives and its synthesis method
  • A kind of graft copolymer of cellulose and its derivatives and its synthesis method
  • A kind of graft copolymer of cellulose and its derivatives and its synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]First, dissolve 0.0348g ethylene glycol antimony in 10ml ethylene glycol (EG), add 66.4g terephthalic acid (TPA) into a 250ml four-necked flask, and add 34.6ml ethylene glycol. 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. Vacuumize to 5000Pa and increase the system temperature 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 2512.

[0032] Take 1 gram of PET with a molecular weight of 2512 and dissolve it in 10ml of tetrachloroethane, add 0.045g of isophorone diisocyanate and 0.1ml of butyltin dilaurate, and react 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 ultrasonically dissolved in 30 ml of acetone solution, added to the tetrachloroetha...

Embodiment 2

[0034] First, dissolve 0.038g ethylene glycol antimony in 10ml ethylene glycol (EG), add 66 g terephthalic acid (TPA) into a 250ml four-necked flask, and add 30ml ethylene glycol. React at 220°C under normal pressure for about 12 hours until the system becomes transparent and the esterification reaction is complete. Vacuumize to 4000Pa and increase the system temperature to 250°C for 30 minutes of reaction; evacuate to 300Pa and raise the system temperature to 285°C for 10 minutes of polycondensation. The reaction was stopped, and the produced product was poured into water while it was hot to quench to obtain PET with a number average molecular weight of 4316.

[0035] Dissolve 0.8g of PET with a molecular weight of 4316 in 10ml of tetrachloroethane, add 0.019g of 2,4-toluene diisocyanate and 0.08ml of dibutyltin diacetate, and react at 70°C for 4 hours to obtain a prepolymerized isocyanate thing. 0.5 g of cellulose diacetate with a number average molecular weight of 70,000 ...

Embodiment 3

[0038] First, dissolve 0.042g of ethylene glycol antimony in 10ml of ethylene glycol (EG), add 66g of terephthalic acid (TPA) into a 250ml four-necked flask, and add 20ml of ethylene glycol. The reaction was carried out under normal pressure at 210°C for about 12 h until the system became transparent and the esterification reaction was completed. Vacuumize to 4000Pa and raise the system temperature to 250°C, and react for 30min. Vacuumize to 300 Pa, raise the temperature of the system to 285°C, and polycondense for 20 minutes. The reaction was stopped, and the produced product was poured into water while it was hot to quench to obtain PET with a number average molecular weight of 6036.

[0039] Dissolve 2g of PET with a molecular weight of 6036 in 10ml of tetrachloroethane, add 0.042g of 4,4'-diphenylmethane diisocyanate and 0.2ml of butyltin dilaurate, and react at 70°C for 5 hours to obtain terminal isocyanate prepolymer. 0.5 g of cellulose diacetate with a number average...

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Abstract

The invention discloses a grafted copolymer of cellulose and derivatives thereof and a synthesizing method of the grafted copolymer. The method comprises the steps that 1, terephthalic acid and ethylene glycol are subjected to an esterification reaction according to the molar ratio of 1:(1.2-2) under the action of a catalyst at 200 DEG C to 240 DEG C, a condensation polymerization reaction is conducted for 10 min to 80 min on the condition that the temperature ranges from 250 DEG C to 285 DEG C and the vacuum degree ranges from 100 Pa to 6,000 Pa, and hydroxylation-terminated polyethylene glycol terephthalate with the molecular weight ranging from 2,000 to 15,000 is synthesized; 2, synthesized PET is dissolved in tetrachloroethane, diisocyanate and a catalyst are added, a reaction is conducted for 3 h to 6 h at 60 DEG C to 80 DEG C, and an isocyanate-terminated prepolymer is obtained; 3, the cellulose and derivatives thereof are ultrasonically dissolved into an acetone solution, the obtained product is added into the tetrachloroethane solution of the isocyanate-terminated prepolymer, a reaction is conducted for 3 days to 7 days, and the grafted copolymer is obtained after purification is conducted. The grafted copolymer is synthesized from the cellulose and derivatives thereof and small molecular weight PET, and the advantages of being simple in process and high in grafting ratio are achieved. The obtained grafted copolymer is used for cellulose and PET blending and can improve the compatibility of the cellulose and PET.

Description

technical field [0001] The invention belongs to the technical field of polymer polymerization, and in particular relates to a graft copolymer of cellulose and its derivatives and a synthesis method thereof. Background technique [0002] Plastic products account for a large proportion of current industrial production and daily life, and they are difficult to degrade in the natural environment. Direct or indirect pollution caused by plastic products has already affected the global ecosystem. What is even more worrying is that plastic pollution has extended from the continent to the ocean, seriously affecting the stability of the marine ecosystem. Polyethylene terephthalate (PET) is widely used around the world due to its high strength, good stability and easy processing. The proportion of PET in the production of global synthetic fibers exceeds 50%. However, there is currently no suitable environmentally friendly method for the treatment of PET waste. Therefore, finding biode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00C08G63/91C08L87/00C08L67/02C08L1/02
Inventor 白富栋郎美东沙陈杰方向晨李政
Owner CHINA PETROLEUM & CHEM CORP
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