A kind of preparation method of azide grafting modified nitrocellulose microspheres

A technology of nitrocellulose and graft modification, which is applied in the field of new energetic materials, can solve the problems of unstable control of formula component content, poor technological performance of medicinal slurry, increased viscosity of medicinal slurry, etc., so as to improve uniform dispersion. and physical compatibility, improve the preparation process, and improve the effect of plasticizing performance

Active Publication Date: 2021-06-01
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But now, most of the research and application of azide energetic polymers are directly added to the propellant formulation components, or introduced into the propellant components in other physical composite ways, so that there will be differences between the components. Unfavorable pheno

Method used

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  • A kind of preparation method of azide grafting modified nitrocellulose microspheres
  • A kind of preparation method of azide grafting modified nitrocellulose microspheres
  • A kind of preparation method of azide grafting modified nitrocellulose microspheres

Examples

Experimental program
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Example Embodiment

[0037] Example 1:

[0038] A kind of NC-N 3 The preparation method of microsphere, its process comprises the steps:

[0039] Step 1: Add 5.0g NC-N to the reactor 3 , then add 65g of dispersant water, start the agitator to stir and heat at a speed of 320 rpm to form a dispersion system;

[0040] Step 2: When the temperature rises to 65°C, slowly add 35.0 g of ethyl acetate solvent dropwise to the dispersion system prepared in the first step, and after the addition of the solvent is completed, adjust the stirring speed to 550 rpm and continue stirring for 60 minutes into small pieces of viscose;

[0041] The third step: take by weighing 1.5g gelatin and be mixed with 10.0% protective glue aqueous solution, join in the small piece viscose liquid that the second step makes, add 0.024g sodium lauryl sulfate after stirring for 60 minutes, Continue to stir for 25 minutes to form an "oil-water" type stable emulsion, in which the cohesive blocks formed without being stabilized by t...

Example Embodiment

[0046] Example 2:

[0047] A NC-N 3 The preparation method of microsphere, its process comprises the steps:

[0048] Step 1: Add 5.0g NC-N to the reactor 3 , then add 75g of dispersant water, start the agitator to stir and heat at a speed of 320 rpm to form a dispersion system;

[0049] Step 2: When the temperature rises to 65°C, slowly add 45.0 g of ethyl acetate solvent dropwise to the dispersion system prepared in the first step, and after the addition of the solvent is completed, adjust the stirring speed to 600 rpm and continue stirring for 60 minutes into small pieces of viscose;

[0050] The third step: take by weighing 2.0g white gelatin and be mixed with 10.0% protective glue aqueous solution, join in the small piece viscose liquid that the second step makes, add 0.030g sodium lauryl sulfate after stirring for 60 minutes, Continue to stir for 25 minutes to form an "oil-water" type stable emulsion, in which the cohesive blocks formed without being stabilized by the...

Example Embodiment

[0055] Example 3:

[0056] A kind of NC-N 3 The preparation method of microsphere, its process comprises the steps:

[0057] Step 1: Add 5.0g NC-N to the reactor 3 , then add 85g of dispersant water, start the agitator to stir and heat at a speed of 320 rpm to form a dispersion system;

[0058] Step 2: When the temperature rises to 65°C, slowly add 55.0 g of ethyl acetate solvent dropwise to the dispersion system prepared in the first step, and after the addition of the solvent is completed, adjust the stirring speed to 650 rpm and continue stirring for 60 minutes into small pieces of viscose;

[0059] The 3rd step: take by weighing 2.5g white gelatin and be mixed with 10.0% protective glue aqueous solution, join in the small piece viscose liquid that the second step makes, add 0.034g sodium lauryl sulfate after stirring for 60 minutes, Continue to stir for 25 minutes to form an "oil-water" type stable emulsion, in which the cohesive blocks formed without being stabilized ...

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Abstract

The invention discloses a preparation method of azide-grafted modified nitrocellulose microspheres. Under the action of mechanical stirring, NC-N 3 Disperse in deionized water, and raise the temperature at the same time, so that the system slowly forms a uniform liquid phase; when the temperature rises to 65 ° C ~ 70 ° C, slowly add solvent to the dispersed liquid phase system, and stir to form a viscous glue; Slowly add the pre-prepared aqueous solution of protective glue into the liquid, add sodium lauryl sulfate in batches after stirring, and continue stirring to form an "oil-water" type stable emulsion; slowly raise the temperature to 66 ° C ~ 72 ° C , carry out pre-distillation under reduced pressure until 30% of the total solvent is evaporated, add dehydrating agent in three batches, and continue to stir; then continue to heat up to 86 ° C ~ 88 ° C, until the solvent is completely evaporated, NC‑N can be obtained 3 The microspheres are then washed and dried to obtain the target product. The invention improves the physical compatibility between the components, reduces the phase separation probability between the phases, and improves the NC-N 3 Performance of microspheres in propellant powder applications.

Description

technical field [0001] The invention relates to a preparation method of nitrocellulose microspheres modified by azide grafting. It belongs to the technical field of new energetic materials. Background technique [0002] Nitrocellulose (NC) is an important component of gunpowder such as solid propellants. NCs that were not densified by solvent plasticization showed a loose, non-colloid-like fibrous state. If the loose fibrous NC is directly introduced into the propellant formula, the NC absorbs the plasticizer in the formula and plasticizes, and this process will proceed rapidly, which will cause the viscosity of the gunpowder slurry to rise sharply and agglomerate. The preparation process of propellant and other gunpowder grains cannot be completed; in addition, the direct use of loose NC to prepare grains will seriously affect the regulation of combustion law due to its poor compactness, thereby greatly reducing the combustion performance of gunpowder. In order to improv...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08L87/00C06B21/00C06B25/00C06D5/06
CPCC06B21/0016C06B25/00C06D5/06C08J3/12C08J2387/00
Inventor 吴艳光鲁博文杜飞鹏张云飞罗运军葛震刘爱传
Owner WUHAN INSTITUTE OF TECHNOLOGY
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