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A kind of dissolvable three-dimensional cross-linked elastomer and its preparation and processing method

A technology of three-dimensional cross-linking and elastomers, which is applied in the direction of offensive equipment, compressed gas generation, explosives, etc., can solve the problem of difficult dissociation of covalently bonded three-dimensional cross-linked polymer elastomers, and achieve the effect of efficient recovery

Active Publication Date: 2021-01-26
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that conventional covalently bonded three-dimensional crosslinked polymer elastomers are difficult to dissociate, and propose a solvent-soluble, ionic bond crosslinked polymer elastomer and its preparation method and treatment method

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0061] The preparation method of terminal triazolyl polybutadiene is:

[0062] 1) Dissolve 100g of alkyne-terminated polybutadiene in 200mL of n-heptane solvent, place in a 500mL three-necked flask equipped with a stirring device and nitrogen protection, add 1.31g of sodium ascorbate, 0.527g of CuSO 4 , stir evenly;

[0063] 2) Add 8.788g of benzyl azide equivalent to the molar equivalent of the terminal alkynyl group in step 1) into the container of step 1); [or 7.597g of methyl 2-azidoacetate]

[0064] 3) React the mixed solution of step 2) at 50° C. under stirring conditions for 4 hours, cool down, and remove the nitrogen protection;

[0065] 4) The reaction mixture obtained in step 3) was extracted three times with 50 mL of distilled water, and about 95 g of terminal triazolyl polybutadiene prepolymer was obtained after rotary evaporation and drying.

[0066] Product infrared analysis showed that 3306cm -1 The infrared absorption peak of the terminal alkyne group disapp...

Embodiment 1

[0099] Put 20g of terminal triazolyl polybutadiene into a dry beaker, add 1.452g of tribromoneopentyl alcohol curing agent, and stir evenly. Then it was vacuum casted into a tetrafluoroethylene mold and cured at 90° C. for 6 days to obtain a polybutadiene elastomer cross-linked by triazolium ions. The mechanical tensile strength of the elastic body at 20° C. is 1.35 MPa, and the elongation is 180%.

[0100] 1 g of the obtained elastomer was soaked in 5 g of 1-bromopentane solvent, and after 5 days, the elastomer was completely dissolved and turned into a liquid state.

Embodiment 2

[0102] Put 20g of triazolyl-terminated polyethylene oxide tetrahydrofuran copolyether into a dry beaker, add 1.012g of tribromoneopentyl alcohol curing agent, and stir evenly. Then it was vacuum casted into a tetrafluoroethylene mold and cured at 90° C. for 6 days to obtain a triazolium ion-crosslinked polyethylene oxide tetrahydrofuran copolyether elastomer. The mechanical tensile strength of the elastic body at 20° C. is 1.25 MPa, and the elongation is 130%.

[0103] 1 g of the obtained elastomer was soaked in 5 g of 1-bromopentane solvent, and after 5 days, the elastomer was completely dissolved and turned into a liquid state.

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Abstract

The invention relates to a dissoluble three-dimensional cross-linked elastomer and a production method and a treatment method thereof, and belongs to the technical field of compound solid propellants.According to the dissoluble three-dimensional cross-linked elastomer and the production method and the treatment method thereof, a triazole-terminated prepolymer and a halide are reacted to generatea polymer elastic material with triazolium groups subjected to three-dimensional cross-linking. The elastomer has a stable chemical cross-linked network. Different from current common polymer elastomers with covalent bonds cross-linked, the polymer elastomer with ionic cross-linked triazolium can be subjected to an ion exchange reaction in the presence of a unitary halogenated compound to make thethree-dimensional cross-linked network dissociated. By using the elastomer for producing a solid compound propellant, the polymer cross-linked network can be dissociated, the elastomer changes from asolid state to a liquid state, and a waste solid compound propellant is efficiently recovered and used.

Description

technical field [0001] The invention relates to a soluble three-dimensional cross-linked elastomer and a preparation method and a treatment method thereof, belonging to the technical field of composite solid propellants. Background technique [0002] As the power source of solid rocket motor, composite solid propellant not only needs to meet the energy demand of solid rocket motor; at the same time, as an engineering component, composite solid propellant also needs to have certain mechanical properties in a wide temperature range to meet the requirements of different working environments . Composite solid propellant is a composite material with polymer cross-linked network elastomer as the continuous phase and solid filler as the dispersed phase, in which the polymer continuous phase is the matrix that carries the mechanical properties of the composite solid propellant; the mechanical properties are stable, good polymerization Bioelastomers are the prerequisite for the prep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08J3/09C08L47/00C08L71/02C08L75/08C08K5/06C08K5/02C06B23/00C06B45/10C06D5/00
CPCC06B45/10C06D5/00C08J3/093C08J3/24C08J2347/00C08J2371/02C08J2375/08C08K5/02C08K5/06
Inventor 翟进贤郭晓燕耿泽
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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