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Method for preparing double-energy-containing-group polyurethane elastomer

A polyurethane elastomer and dual-energy technology, which is applied in the field of preparation of dual-energy-containing polyurethane elastomers, can solve problems such as large structural differences, poor trinitrotoluene compatibility, and reduced energy of thermoplastic elastomers, and achieve enhanced Intermolecular interaction, enhancing the effect of interaction between benzene rings

Inactive Publication Date: 2014-07-02
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, inert fatty alcohol chain extenders are mainly used in the preparation of thermoplastic polyurethane elastomers. On the one hand, the energy of the thermoplastic elastomer itself is reduced; Polyurethane has the problem of poor compatibility with trinitrotoluene

Method used

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  • Method for preparing double-energy-containing-group polyurethane elastomer
  • Method for preparing double-energy-containing-group polyurethane elastomer
  • Method for preparing double-energy-containing-group polyurethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add epichlorohydrin dropwise to 2,6-dinitro-p-dibenzyl alcohol and tin tetrachloride methylene chloride solution at a constant temperature of 30°C, wherein 2,6-dinitro-p-dibenzyl alcohol and epichlorohydrin The molar ratio of 1:100, adding 3.0% tin tetrachloride mass fraction. The metered epichlorohydrin was added dropwise within 2 hours, and reacted for 3 hours under constant temperature stirring to obtain a polyepichlorohydrin solution.

[0025] The polyepichlorohydrin solution was added to water at 60°C for washing, the upper aqueous solution was discarded, and the organic matter in the lower layer was distilled under reduced pressure to obtain polyepichlorohydrin. The obtained polyepichlorohydrin has a number average molecular weight of 8670 and a weight average molecular weight of 14500 as measured by gel chromatography.

[0026] Under the protection of nitrogen, the temperature is 110 ° C, sodium azide and polyepichlorohydrin in N, N-dimethylformamide solvent to ...

Embodiment 2

[0031] Add epichlorohydrin dropwise to 2,6-dinitro-p-dibenzyl alcohol and tin tetrachloride methylene chloride solution at a constant temperature of 30°C, wherein 2,6-dinitro-p-dibenzyl alcohol and epichlorohydrin The molar ratio of 1:50, adding 3.0% tin tetrachloride mass fraction. The metered epichlorohydrin was added dropwise within 2 hours, and reacted for 3 hours under constant temperature stirring to obtain a polyepichlorohydrin solution.

[0032] The polyepichlorohydrin solution was added to 60°C water for washing, the upper aqueous solution was discarded, and the organic matter in the lower layer was distilled under reduced pressure to obtain polyepichlorohydrin. The number average molecular weight of the obtained polyepichlorohydrin measured by gel chromatography is 4210, and the weight average molecular weight is 6100.

[0033] Under the protection of nitrogen, the temperature is 120 ° C, sodium azide and polyepichlorohydrin in N, N-dimethylformamide solvent to synt...

Embodiment 3

[0038] Add epichlorohydrin dropwise to 2,6-dinitro-p-dibenzyl alcohol and tin tetrachloride methylene chloride solution at a constant temperature of 30°C, wherein 2,6-dinitro-p-dibenzyl alcohol and epichlorohydrin The molar ratio of 1:10, adding 3.0% tin tetrachloride mass fraction. The metered epichlorohydrin was added dropwise within 2 hours, and reacted for 3 hours under constant temperature stirring to obtain a polyepichlorohydrin solution.

[0039] The polyepichlorohydrin solution was added to water at 60°C for washing, the upper aqueous solution was discarded, and the organic matter in the lower layer was distilled under reduced pressure to obtain polyepichlorohydrin. The number average molecular weight of the obtained polyepichlorohydrin measured by gel chromatography is 3480, and the weight average molecular weight is 6030.

[0040] Under the protection of nitrogen, the temperature is 100 ° C, sodium azide and polyepichlorohydrin in N, N-dimethylformamide solvent to s...

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Abstract

The invention relates to a method for preparing a thermoplastic elastomer, and in particular to a method for preparing double-energy-containing-group polyurethane elastomer. The method comprises the following steps: performing cationic polymerization on 2,6-binitro p-dibenzyl alcohol and epoxy chloropropane to synthesize polyepichlorohydrin; under the protection of nitrogen, performing substitution reaction on sodium azide and polyepichlorohydrin to synthesize hydroxyl-terminated polynitrine glycidyl ether; and under the protection of nitrogen, preparing the double-energy-containing-group polyurethane elastomer by using the 2,6-binitro p-dibenzyl alcohol, 4,4'-diphenylmethane diisocyanate and the hydroxyl-terminated polynitrine glycidyl ether. According to the method for preparing the double-energy-containing-group polyurethane elastomer, energy-containing groups (nitryl and azide) are introduced into the molecular structure of the polyurethane elastomer, as the polyurethane elastomer has relatively high energy, and a benzene ring structure with two nitrogen groups in a part of the molecular structure of a used chain extender is similar to trinitrotoluene, the interaction between the molecules of the elastomer and the molecules of the trinitrotoluene can be enhanced.

Description

technical field [0001] The invention relates to a method for preparing thermoplastic elastomers, in particular to a method for preparing polyurethane elastomers containing dual energy groups. Background technique [0002] Polyurethane is a kind of thermoplastic elastomer binder. It is a type of thermoplastic elastomer that has been studied more and widely used. It is also the earliest industrialized thermoplastic elastomer and has been widely used in solid propellants. [0003] At present, the preparation method of energetic thermoplastic polyurethane elastomer is generally to use ethylene glycol, 1,4-butanediol, 2,4-pentanediol and other small molecular diols as initiators to synthesize polyepoxychlorides with different molecular weights. Propane, further azide to prepare glycidyl azide (GAP); ethylene glycol (EDO), 1,4-butanediol (BDO), 1,2-propanediol, diethylene glycol (DEG) , 1,5-pentanediol and 1,6-hexanediol (HDO) 2,4-pentanediol, trimethylolpropane and small molecul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/50C08G18/32
CPCC08G18/10C08G18/5021C08G18/7671C08G18/384
Inventor 王树民范立
Owner SOUTHWEAT UNIV OF SCI & TECH
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