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Azido dihydroxypropyl cellulose nitrate preparation method and synthesis

A technology of dihydroxypropyl azide and dihydroxypropyl, applied in the field of polymer chemistry, can solve problems such as difficult to meet the overall requirements, poor thermoplasticity, difficult to remove halogens, etc.

Inactive Publication Date: 2005-01-26
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the macromolecule still maintains a high degree of crystallinity, the thermoplasticity is poor, and a small amount of halogen remains in the product, which is difficult to remove, so it is difficult to meet the overall requirements of modern warfare for high-performance propellants
[0005] Shao Ziqiang and others used natural cellulose to prepare nitrate ester of cellulose glycerol ether, which made the product have good thermoplasticity, but there is still room for improvement in its energy

Method used

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  • Azido dihydroxypropyl cellulose nitrate preparation method and synthesis
  • Azido dihydroxypropyl cellulose nitrate preparation method and synthesis
  • Azido dihydroxypropyl cellulose nitrate preparation method and synthesis

Examples

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Embodiment 1

[0019] Example 1: 15.11 parts of pulverized cotton cellulose with a degree of polymerization of 1000, 150.9 parts of isopropanol, and 25.0 parts of toluene were loaded into a reactor. NaOH solution (8.27 parts NaOH / 22.31 parts water) was added within 15 min and stirring was continued for 60 min. Add 15.63 parts of high-purity glycidyl alcohol dispersed in 18.31 parts of isopropanol and stir for 15 minutes to disperse. Gradually raise the temperature to 55°C and react for 1.5h. Under this condition, continue to add 45 parts of 50% NaOH solution to the reaction system within 15 minutes. After stirring for 10 minutes, add a dispersion of 15.51 parts of glycidol / 8.21 parts of isopropanol to the reaction system, and continue to stir for 15 minutes, then raise the temperature of the reaction to 68 ° C, and proceed for 1.5 hours. After cooling, use 85% isopropanol The aqueous solution is neutralized and washed twice. For the third time, use 80% acetone solution to dechlorinate. T...

Embodiment 2

[0021]Example 2: 14.96 parts of pulverized wood cellulose with a degree of polymerization of 900, 150.0 parts of isopropanol, and 25.2 parts of toluene were loaded into a reactor. NaOH solution (8.25 parts NaOH / 22.36 parts water) was added within 15 min and stirring was continued for 60 min. Add 15.05 parts of distilled glycidol dispersed in 25.66 parts of isopropanol at one time and stir for 15 minutes to disperse. Then the temperature was raised to 54°C and the reaction was carried out for 1.5h. Subsequently, the temperature of the reaction was raised to 65° C. for another 1.5 h, and after cooling, it was neutralized and washed twice with 85% isopropanol aqueous solution. For the third time, use 80% acetone solution to dechlorinate. Then dry at 65°C for 2 hours to obtain dihydroxypropyl cellulose ether as a white powder product. Dissolve 10.0 parts of dihydroxypropyl cellulose ether in dimethylformamide / 9% LiCl system, the solution concentration is controlled at 6%, and a...

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Abstract

The invention discloses the azido dihydroxypropyl cellulose nitrate preparation method and synthesis which comprises, subjecting natural cotton and cellulose to alkalization under semi-homogeneous phase reaction condition, charging epoxy propyl alcohol for sectionwise etherification to the alkali cellulose, obtaining dihydroxy cellulose ether whose substitution degree is between 0.5-1.2, completely dissolving in dimethyl polyamide / 9% LiCl system, scouring, purifying, drying and dissolving in dimethyl sulfoxide, carrying out homogeneous phase nitrine at high temperature.

Description

technical field [0001] The invention belongs to the preparation and synthesis of azidodihydroxypropyl cellulose nitrate, which belongs to the technical field of polymer chemistry, and its national patent classification number is C08. Background technique [0002] Cellulose is a long-chain natural high polymer in which anhydrous glucose residues are connected by β-1,4-glucosidic bonds. It is the most widely distributed and one of the most important polysaccharides in nature. [0003] The cellulose glucose unit contains three hydroxyl groups with chemical reactivity, which can make cellulose undergo various reactions to prepare a series of derivatives such as cellulose ether, cellulose ester and deoxy cellulose, among which deoxy cellulose derivatives are It is a research object that has received much attention in recent years. Due to its unique properties, it is widely used in the fields of coatings, paints, medicine, trace trace analysis, military industry, aerospace, and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B5/02
Inventor 邵自强王文俊王飞俊第五旬宁何邦民
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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