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A kind of preparation method of terminal triazolyl polyether

A technology of triazolyl-terminated polyether and nitrogen-based polyether, which is applied in the field of preparation of triazolyl-terminated polyether, can solve problems such as potential safety hazards, difficult disposal of waste solid composite propellants, environmental pollution, etc., and achieve efficient recycling Effect

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 various 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

[0040] The preparation method of terminal triazolyl polyethylene glycol is:

[0041] 1) Dissolve 40g of azido-terminated polyethylene glycol in 200mL of tetrahydrofuran solvent, place in a 500mL three-necked flask equipped with mechanical stirring and nitrogen protection, add 0.37g of sodium ascorbate, 0.15g of CuSO 4 , stir evenly;

[0042] 2) 1.04g propynyl alcohol is added in the container of step 1);

[0043] 3) react the mixed solution of step 2) at 40°C under stirring conditions for 4 hours, cool down, and remove the nitrogen protection;

[0044] 4) The reaction mixture in step 3) was extracted three times with distilled water, and after rotary evaporation and drying, 38 g of terminal triazolyl polyethylene glycol was obtained.

[0045] Product infrared analysis shows that, 2100cm -1 The infrared absorption peak of the terminal azido group disappears, 13 In the C NMR spectrogram, the characteristic absorption peak corresponding to the carbon atom connected to the azi...

Embodiment 1

[0055] Put 20g of triazolyl-terminated polyethylene oxide tetrahydrofuran copolyether into a dry beaker to ensure that the molar number of triazole groups is equivalent to the molar number of bromine atoms, 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%.

[0056] 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

[0058] Put 20g of triazolyl-terminated polyethylene oxide tetrahydrofuran copolyether into a dry beaker, add 0.285g of 1,6-dibromohexane and 0.759g 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 1.05 MPa, and the elongation is 150%.

[0059] 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 terminal triazolyl polyether, and belongs to the technical field of composite solid propellants. A terminal triazolyl prepolymer and halides carry outreactions to generate a polymer elastic material with three-dimensionally crosslinked triazolium groups. The elastomer has a stable chemical crosslinking network. Different from conventional covalentbond crosslinked polymeric elastomers, triazolium group crosslinked polymeric elastomer can carry out ion exchange reactions with mono-halogenated compounds, and the three dimensional crosslinked network is dissociated. The elastomer can be used to prepare a solid composite propellant, the polymer crosslinked network dissociation can be realized, the solid elastomer is converted into liquid elastomer, and the waste and oil solid composite propellant is efficiently recovered and utilized.

Description

technical field [0001] The invention relates to a preparation method of a triazole-terminated polyether, 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 propell...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/337C08G65/326C08G65/331
CPCC08G65/326C08G65/3312C08G65/3318C08G65/337
Inventor 郭晓燕翟进贤
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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