A modified hydroxyl-terminated polybutadiene and its preparation method and application

A modified technology of hydroxyl-terminated polybutadiene, which is applied in the production of offensive equipment, explosives, compressed gas, etc., can solve the problem of weak bonding between the adhesive matrix and the filler interface, single functionality, and complex propellant formulations, etc. problems, to achieve the effect of improving thermodynamic compatibility, improving mechanical properties, and accelerating solid-liquid wetting

Active Publication Date: 2021-08-27
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these modified products often contain only one functional group and have a single function. At present, research on HTPB modification at home and abroad is mainly focused on improving its energy level and enhancing molecular polarity.
For the multi-functional modification of HTPB, especially according to the actual problems in the formulation design process of butyl-hydroxyl propellant, such as weak bonding between the binder matrix and the filler interface, and complex propellant formulations, the HTPB interface is endowed by chemical means. There are no research reports on functional properties such as bonding, cross-linking enhancement, and burning rate adjustment.

Method used

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  • A modified hydroxyl-terminated polybutadiene and its preparation method and application
  • A modified hydroxyl-terminated polybutadiene and its preparation method and application
  • A modified hydroxyl-terminated polybutadiene and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0052] In the present embodiment, the molecular structure of multifunctional modified hydroxyl-terminated polybutadiene (AEHTPB-B) containing ring boronic acid ester group is as follows:

[0053]

[0054] Wherein, x=44-64, y=2-5, z=3-10.

[0055] The preparation method of the AEHTPB-B of the present embodiment comprises the following specific steps:

[0056] S1. Add 30g of HTPB, 50g of toluene, 15g of glacial acetic acid, and 3g of cationic resin into the reaction vessel, stir evenly and heat up to 60°C; add 75g of H 2 o 2 , and then continue the constant temperature reaction for 8 hours; after the reaction is over, let it stand for stratification, wash the organic layer with distilled water until it is neutral, and at the same time, the washing solution will no longer discolor the starch potassium iodide test paper; A colorless and transparent viscous liquid was obtained, namely EHTPB; the epoxy value of the product was 0.35mol / 100g, and the yield was 97.8%;

[0057] S2...

Embodiment 2

[0060] The AEHTPB-B molecular structure of the present embodiment is as follows:

[0061]

[0062] Among them, x=44-64, y=2-4, z=3-6.

[0063] The method for preparing the AEHTPB-B of the present embodiment may further comprise the steps:

[0064] S1. Add 30g HTPB, 30g toluene, 30g glacial acetic acid, 1g ammonium tungstate hydrate into the reaction vessel, stir evenly and raise the temperature to 55°C, add 60g H 2 o 2, and then continue the constant temperature reaction for 6 hours; after the reaction is over, let it stand for stratification, wash the organic layer with distilled water until it is neutral, and at the same time, the washing solution no longer discolors the starch potassium iodide test paper; Transparent viscous liquid, epoxidized hydroxyl-terminated polybutadiene (EHTPB). The epoxy value of the product is 0.25mol / 100g, and the yield is 97.9%;

[0065] S2. Take 20g of the EHTPB prepared in step S1 and add it to the reaction kettle, dissolve it with 30g o...

Embodiment 3

[0068] AEHTPB-CN molecular structure is as follows in the present embodiment:

[0069]

[0070] Among them, x=44-58, y=3-5, z=8-10.

[0071] The preparation method of AETHPB-CN in this embodiment comprises the following specific steps:

[0072] S1. Add 30g of HTPB, 30g of toluene, 16g of glacial acetic acid, and 2g of cation exchange resin into the reaction vessel, stir evenly and heat up to 55°C, and dropwise add 75g of H 2 o 2 , and then continue the constant temperature reaction for 7 hours; after the reaction is over, let it stand for stratification, wash the organic layer with distilled water until it is neutral, and at the same time, the washing solution no longer discolors the starch potassium iodide test paper; the organic phase is rotary evaporated under reduced pressure at 90°C to obtain a colorless Transparent viscous liquid, namely EHTPB; the epoxy value of the product is 0.44 mol / 100g, and the yield is 97.1%;

[0073] S2. Take 20 g of the EHTPB prepared in s...

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Abstract

The invention relates to a modified hydroxyl-terminated polybutadiene and its preparation method and application. The modified hydroxyl-terminated polybutadiene has the following structure: the modified hydroxyl-terminated polybutadiene uses HTPB as a starting material, and it is processed Chemical modification to prepare modified HTPB containing hydroxyl group, tertiary amino group and borate group or cyano group at the same time; the modified product is partially replaced by HTPB and added to the butylated hydroxyl propellant formula. The borate group or cyano group in its molecular structure The tertiary amine group can play an interfacial bonding effect on ammonium perchlorate, and can inhibit the decomposition of ammonium perchlorate. The hydroxyl group can play a cross-linking and strengthening role in the curing stage. In addition, this modified HTPB, which integrates functions such as cross-linking enhancement, interfacial bonding, and burning rate adjustment, has excellent compatibility with traditional HTPB adhesives. Polarity, enhancing thermodynamic compatibility with other functional additives.

Description

technical field [0001] The invention relates to the technical field of modification of hydroxyl-terminated polybutadiene, in particular to a modified hydroxyl-terminated polybutadiene and its preparation method and application, especially the application in the preparation of solid propellants. Background technique [0002] Hydroxybutylene propellant is a type of solid propellant with hydroxyl-terminated polybutadiene (HTPB) as the binder. Because of its mature formula, low cost, and good comprehensive performance, it is widely used in various strategic and tactical missiles, and is still the mainstream formula of composite solid propellant charges. [0003] However, the main chain structure of HTPB only contains a small amount of polar hydroxyl groups, which makes the binder have problems such as low polarity and weak bonding with the filler interface, which limits the improvement of the performance of the solid propellant. In order to improve the performance of composite ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/30C08F8/42C08F8/32C08F8/08C08F36/06C06B45/10C06B23/00C06B33/12C06D5/06
CPCC06B33/12C06B45/10C06D5/06C08F8/08C08F8/30C08F8/32C08F8/42C08F36/06
Inventor 邓剑如张平安李泽国陈娟李明明朱乐平
Owner HUNAN UNIV
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