Preparation method of nitrate plasticized polyether propellant pure sol

A plasticized polyether and propellant technology, which is applied in the field of separation of energetic polymer materials, can solve the problems that have not been reported in the literature, and achieve the effects of simple and easy preparation methods, reduced sample processing risks, and cost savings

Active Publication Date: 2018-06-26
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, the use of dialysis bags in the field of propellants to remove small molecular impurities has not been reported in the literature so far

Method used

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  • Preparation method of nitrate plasticized polyether propellant pure sol
  • Preparation method of nitrate plasticized polyether propellant pure sol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: Purification and preparation of nitrate ester plasticized polyether propellant pure sol

[0022] Step 1: Prepare the propellant sample and soak it in a solvent: choose petroleum ether as the solvent, soak it for 2 days, change the solvent 6 times during this period, and wash it with a small amount of solvent several times until the solution is colorless.

[0023] Step 2, using a Soxhlet extractor to extract the sol. Heating and reflux at 85°C for 2 days, using chloroform as the solvent, collecting the solution, and recovering the solvent to obtain a coarse sol.

[0024] Step 3, preparing pure sol. The crude sol was put into a dialysis bag with a cut-off molecular weight of 500-1000, dialyzed with tap water for 3 days, and then dialyzed with 10% ethanol aqueous solution for 4 days, taken out and freeze-dried to obtain pure sol.

[0025] figure 1 It is the infrared spectrogram of the pure sol obtained in Example 1. It can be seen in the figure that the so...

Embodiment 2

[0026] Embodiment 2: Purification and preparation of nitrate ester plasticized polyether propellant pure sol

[0027] Step 1, preparing propellant samples and soaking in a solvent: choose methanol as the solvent, soak for 2 days, change the solvent 10 times during the period, and wash with a small amount of solvent for several times until the solution is colorless.

[0028] Step 2, using a Soxhlet extractor to extract the sol. Acetone was selected as the solvent, heated and refluxed at 70°C for 1 day, the solution was recovered, and the solvent was volatilized to obtain a crude sol.

[0029] Step 3, preparing pure sol. The crude sol was put into a dialysis bag with a cut-off molecular weight of 2000. After dialysis with tap water for 4 days and 30% ethanol aqueous solution for 3 days, the sol was taken out and freeze-dried to obtain pure sol.

[0030] The infrared spectrum of the pure sol is shown in figure 2 , it can be seen in the figure that the sol is polyether polyure...

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PUM

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Abstract

The invention relates to a preparation method of pure nitrate plasticized polyether propellant sol through purification, and belongs to the field of energetic materials. The method comprises the following steps: carrying out solvent immersing and washing to remove most of dangerous plasticizers nitroglycerine (NG), butanetriol trinitrate (BTTN), ammonium perchlorate and octogen, extracting sol in a Soxhlet extractor by adopting an organic solvent, and carrying out a dialysis process for preparing pure sol in order to prepare the highly-pure nitrate plasticized polyether propellant sol. The preparation method is widely suitable for purifying polymers in the energetic materials, and has the advantages of effective reduction of the sample treatment risk, simplification of the purifying preparation process, cost saving, simplicity, easiness in implementation, and convenience in promotion of the experiment process.

Description

technical field [0001] The invention relates to a method for separating energetic polymer materials, in particular to a method for purifying nitrate plasticized polyether propellant sol by dialysis. Background technique [0002] Polymer elastomer is composed of condensed phase (cross-linked solidified network) and sol phase (linear and branched high polymer and plasticizer for chain growth and curing reaction) filled between the network chains to act as plasticizers. body. Solid propellants are essentially polymeric elastomers filled with a large amount of solid filler. [0003] The network structure is the support of solid propellants and the main factor affecting the mechanical properties of propellants. Currently, gel fraction and crosslink density are the main means to characterize the network structure of solid propellants, and they are also the main parameters on which propellant failure and aging predictions depend. The so-called polymer elastomer gel is generally ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/02C08L75/08
Inventor 聂海英黄志萍徐娜刘治国赵华丽白杰
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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