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A kind of preparation method of terminal triazolyl polybutadiene

A technology of triazolyl-terminated polybutadiene and alkyne-terminated polybutadiene, which is applied in the field of preparation of triazolyl-terminated polybutadiene, and can solve potential safety hazards, difficulties in handling waste solid composite propellants, and environmental pollution and other issues to achieve the effect of stable mechanical properties

Active Publication Date: 2020-08-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the stable and difficult dissociation of the covalently bonded three-dimensional cross-linked polymer network structure, it is extremely difficult to dispose of waste solid composite propellants
At present, the commonly used open-air incineration method, high-pressure water cutting method, liquid nitrogen cutting method and other extraction methods to deal with waste composite solid propellants cause serious environmental pollution, safety hazards and high costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The preparation method of terminal triazolyl polybutadiene is:

[0035] 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;

[0036] 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 methyl 2-azidoacetate (7.597g)]

[0037] 3) React the mixed solution of step 2) at 50° C. under stirring conditions for 4 hours, cool down, and remove the nitrogen protection;

[0038] 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.

[0039] Product infrared analysis showed that 3306cm -1 The infrared absorption peak of the terminal alkyne group disappe...

Embodiment 1

[0042] Put 20g of terminal triazolyl polybutadiene into a dry beaker to ensure that the molar number of triazole groups is equivalent to the molar number of bromine atoms, add 1.452g of corresponding 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 1.35 MPa, and the elongation is 180%.

[0043] After soaking 1 g of the obtained elastomer in 5 g of 1-bromopentane solvent, the elastomer was completely dissolved after 5 days and became liquid.

Embodiment 2

[0045] Put 20g of terminal triazolyl polybutadiene into a dry beaker, add 0.409g of 1,6-dibromohexane and 1.089g of tribromoneopentyl alcohol as a mixed 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 200%.

[0046] After soaking 1 g of the elastomer in 5 g of 1-bromooctane solvent, the elastomer was completely dissolved after 5 days and became liquid.

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Abstract

The invention relates to a preparation method of triazole-terminated polybutadiene, and belongs to the technical field of composite solid propellants. According to the invention, a triazole-terminatedprepolymer reacts with a halide to generate a triazolium group three-dimensional cross-linked polymer elastic material. The elastomer has a stable chemically crosslinked network. Different from conventional covalent bond cross-linked polymer elastomers, the triazolium ion cross-linked polymer elastomer can be subjected to ion exchange reaction when encountering a monobasic halogenated compound, so that a three-dimensional cross-linked network is dissociated. When the elastomer is used for preparing a solid composite propellant, polymer cross-linked network dissociation can be realized, the elastomer is changed from a solid state to a liquid state, and efficient recovery and utilization of the waste solid composite propellant are realized.

Description

technical field [0001] The invention relates to a preparation method of a triazole-terminated polybutadiene, 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 preparation of high-performance composite solid pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/30C08F136/06C08J3/24C06B23/00C06B45/10C06D5/00C08L47/00
CPCC06B45/10C06D5/00C08F8/30C08J3/24C08J2347/00C08F136/06
Inventor 郭晓燕翟进贤
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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