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Method for preparing cellulose ester grafted aliphatic polyester copolymer

An aliphatic polyester and cellulose ester technology, applied in polyester coatings, polycarbonate coatings, coatings, etc., can solve the problems of high price and poor mechanical properties of cellulose esters, and achieve simplified production process and easy operation. , The effect of simple production process

Active Publication Date: 2013-07-10
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But as we all know, the price of cellulose ester is generally higher, and the mechanical properties are poor at the same time.

Method used

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  • Method for preparing cellulose ester grafted aliphatic polyester copolymer
  • Method for preparing cellulose ester grafted aliphatic polyester copolymer
  • Method for preparing cellulose ester grafted aliphatic polyester copolymer

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0032] Embodiment 1: Preparation of cellulose acetate grafted polylactic acid

[0033] Add 300 grams of ionic liquid AMIMCl, 15 grams of pulverized cotton pulp in a 0.5-liter vacuum mixer, and banbury for 2 hours at 80° C. to dissolve the cellulose evenly; ratio of 1:1), 80 ° C banbury reaction for 2 hours; then add 11.3 grams of DMAP (the molar ratio to the hydroxyl group in the cellulose is 1:3) and 80 grams of lactide (the molar ratio to the hydroxyl group in the cellulose is 2 : 1), vacuumize 80 DEG C banburying reaction for 5 hours; Open the banbury mixer after the reaction finishes, the reaction mixture is poured into water, stir and precipitate the product, filter, wash several times, dry, obtain white powdery cellulose acetate Ester grafted polylactic acid products. The product was dissolved in deuterated DMSO, and its H NMR spectrum was tested. Calculated according to the spectrogram, the degree of substitution of its acetyl group is 1.8, the degree of substitution ...

Embodiment 2

[0040] Embodiment 2: Preparation of cellulose propionate grafted polylactic acid

[0041] In a 250 ml flask, add 100 g of ionic liquid AMIMCl, 6 g of microcrystalline cellulose, and stir overnight at 50° C. under nitrogen to dissolve; Propionic anhydride (the molar ratio of the hydroxyl group in the cellulose is 2:3), stirred and reacted at 50°C for 1 hour; then add 64 grams of lactide (the molar ratio of the hydroxyl group in the cellulose is 4:1), and heat up to 80 ℃, grafting reaction under nitrogen protection for 5 hours; the mixture was precipitated in water, filtered and washed several times to obtain a white powdery cellulose propionate grafted polylactic acid product, the degree of substitution of the propionyl group was 1.7, and the polylactic acid The degree of substitution is 0.9, the degree of polymerization of polylactic acid is 5.6, and the grafting rate of polylactic acid is 58%.

Embodiment 3

[0042] Embodiment 3: Preparation of cellulose butyrate grafted polylactic acid

[0043] Add 200 grams of ionic liquid BMIMCl, 9 grams of microcrystalline cellulose in a 500 ml flask, stir and dissolve under nitrogen at 90°C for 2 hours; Add 96.0 grams of lactide (the molar ratio to the hydroxyl group in the cellulose is 4:1) and fill with nitrogen Continue the grafting reaction at 90°C for 4 hours; precipitate the product with water, filter and wash several times to obtain a light yellow powdery cellulose butyrate grafted polylactic acid product, the degree of substitution of butyryl is 1.5, and the degree of substitution of polylactic acid The degree of polymerization of polylactic acid is 1.3, the degree of polymerization of polylactic acid is 4.2, and the grafting rate of polylactic acid is 60%.

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Abstract

The invention discloses a method for preparing a cellulose ester grafted aliphatic polyester copolymer. The method comprises the following steps: 1) preparing a cellulose / ionic liquid solution by using cellulose as a raw material; 2) conducting a homogeneous acylation reaction of cellulose in the cellulose / ionic liquid solution to obtain partially substituted cellulose ester; and 3) further grafting aliphatic polyester to the partially substituted cellulose ester to obtain cellulose ester grafted aliphatic polyester copolymer. Compared with the existing method, the method has obvious advantages that cellulose with wide source is directly used as raw material to prepare the cellulose ester grafted aliphatic polyester copolymer by a one-pot reaction, without separation and purification of intermediate cellulose ester, and that the entire production process is greatly simplified, and has simple production process and easy operation. The cellulose ester grafted aliphatic polyester copolymer product produced by the method provided by the invention can be used for spinning, film making and molding parts, and also can be used as a compatibilizer for coating, paint, polymer and composite material.

Description

technical field [0001] The invention relates to a preparation method of cellulose ester grafted aliphatic polyester copolymer. Background technique [0002] With the increase of industrial production capacity in human society, non-renewable fossil mineral resources (such as oil, coal, etc.) are increasingly difficult to meet the future needs of human beings, so the effective use of renewable natural resources has become more and more important. Cellulose is the most abundant natural polymer on earth, and making full use of cellulose resources is of great significance to the sustainable development of human society. [0003] Cellulose cannot be melt-processed by conventional thermal processing methods, and it is difficult to dissolve in common solvents, so the processability of cellulose is poor. In order to improve the processability of cellulose, cellulose is usually modified by acylation or etherification to impart melt processability or improve its solubility. In fact, ...

Claims

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Application Information

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IPC IPC(8): C08G63/08C08G64/30C08B3/00C08B3/06C08B3/08C08B3/10C09D167/04C09D169/00C08L1/12C08L67/04C08L69/00C08L1/10
Inventor 武进张军
Owner INST OF CHEM CHINESE ACAD OF SCI
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