Modified hydroxyl-terminated polybutadiene as well as preparation method and application thereof

A technology of hydroxyl-terminated polybutadiene and hydroxyl-terminated polydibutene, which is applied in the application field of modified hydroxyl-terminated polybutadiene and its preparation, and preparation of solid propellants, and can solve the problem of single function and adhesive Solve problems such as weak bonding between matrix and filler interface, complex propellant formula, etc., to optimize the preparation process, improve thermodynamic compatibility, and accelerate solid-liquid wetting

Active Publication Date: 2021-03-30
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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  • Modified hydroxyl-terminated polybutadiene as well as preparation method and application thereof
  • Modified hydroxyl-terminated polybutadiene as well as preparation method and application thereof
  • Modified hydroxyl-terminated polybutadiene as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] In this embodiment, the molecular structure of multifunctional modified hydroxyl-terminated polybutadiene (AEHTPB-B) containing ring borate 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. Take 20 g of the ...

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 raise the temperature 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 0.44mol / 100g, and the yield is 97.1%;

[0073] S2. Take 20 g of the EHTPB ...

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Abstract

The invention relates to modified hydroxyl-terminated polybutadiene as well as a preparation method and application thereof; the modified hydroxyl-terminated polybutadiene has the following structure:HTPB is used as a starting material for chemical modification of the modified hydroxyl-terminated polybutadiene to prepare modified HTPB containing hydroxyl, tertiary amine group and borate group orcyano group at the same time; then the modified product partially replaces HTPB and is added into the formula of the hydroxyl-terminated polybutadiene propellant, wherein the borate group or cyano group in the molecular structure has the function of interfacial bonding of the nitramine filler, the tertiary amine group has the function of interfacial bonding of the ammonium perchlorate and also hasa function of inhibiting decomposition of the ammonium perchlorate, and the hydroxyl group has the function of in cross-linking enhancement in the curing stage. Besides, the modified HTPB integratingthe functions of crosslinking enhancement, interface bonding, combustion speed adjustment and the like has excellent compatibility with a traditional HTPB adhesive, and after the modified HTPB and the traditional HTPB adhesive are mixed, the overall polarity of a propellant adhesive matrix can be improved, and the thermodynamic compatibility with other functional auxiliaries is enhanced.

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 Applications(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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