CN103554524B - Ultrafine dispersion method for single-compound explosive in energetic composite material - Google Patents

Ultrafine dispersion method for single-compound explosive in energetic composite material Download PDF

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CN103554524B
CN103554524B CN201310535078.9A CN201310535078A CN103554524B CN 103554524 B CN103554524 B CN 103554524B CN 201310535078 A CN201310535078 A CN 201310535078A CN 103554524 B CN103554524 B CN 103554524B
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compound explosive
chmical compound
single chmical
solvent
explosive
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CN103554524A (en
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蔺向阳
马方生
赵芦奎
夏宇
况方舟
王萍
杜震
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Nanjing University of Science and Technology
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Abstract

The invention discloses an ultrafine dispersion method for a single-compound explosive in an energetic composite material. The ultrafine dispersion method comprises the following steps: dissolving the single-compound explosive in a solvent to obtain a single-compound explosive solution; dissolving a macromolecular composite material in a solvent to obtain a macromolecular sol; uniformly mixing the single-compound explosive solution with the macromolecular sol in a stirring state to obtain a single-compound explosive-containing macromolecular sol; dispersing the single-compound explosive-containing macromolecular sol into an aqueous solution containing a dispersing agent in a stirring state to form spherical droplets; distilling the solvent in the system step by step to obtain single-compound explosive-containing energetic composite particles. The method has the advantages that the single-compound explosive is not required to be subjected to ultrafine crushing treatment, the technological process is safe, the dispersion particle diameter of the explosive is small, the materials are uniformly mixed and the like, and is suitable for ultrafine dispersion of the energetic composite material of various single-compound explosives.

Description

The super-refinement dispersing method of a kind of single chmical compound explosive in composite material containing energy
Technical field
The present invention relates to polymer composite working method, particularly the super-refinement dispersing method of a kind of single chmical compound explosive in composite material containing energy.
Background technology
Single chmical compound explosive is the important component part of solid energetic material, and the solid energetic material containing single chmical compound explosive is widely applied to the fields such as propelling agent, propelling charge, explosive and priming system.The particle diameter of single chmical compound explosive and the dispersion effect of such material in energetic material directly have influence on its effect.The dispersion of usual single chmical compound explosive in polymer or adhesive composition adopts physical dispersion method more, but along with the reduction of single chmical compound explosive granularity, the mixing of material becomes more and more difficult.The ultra-fine Cyclotrimethylene trinitramine such as, used in typical high energy composite modified double-base propellant, first to the means of superfine grinding be adopted to be ground into micron-sized particle technical grade Cyclotrimethylene trinitramine larger for particle diameter, then be distributed in double-base powder matrix in kneading process by solvent, jitter time is long, and dispersion effect and product stability should not control.For solid propellant, the particle diameter of usual single chmical compound explosive is less, and pressure index is lower, when being applied to rocket engine stability or reliability better.Therefore, traditional super-refinement explosive is in the dispersion of composite material containing energy, and not only operation is more, and jitter time is longer, and dispersing uniformity and stability are difficult to ensure.
Summary of the invention
The object of the present invention is to provide the dispersing method of a kind of single chmical compound explosive in polymer composite, the particularly a kind of single chmical compound explosive super-refinement dispersing method in composite material containing energy.
The technical solution realizing the object of the invention is: the super-refinement dispersing method of a kind of single chmical compound explosive in composite material containing energy, comprises the following steps:
Step 1, single chmical compound explosive is dissolved in solvent obtains single chmical compound explosive solution, polymer composite is dissolved in solvent and obtains polymeric sol;
Described single chmical compound explosive is Cyclotrimethylene trinitramine, octogen, hexanitro-six azepine isoamyl one or more the mixture hereby in alkane, hexanitro-stilbene, trinitro-isophthalic triamine, TNAZ, diamino-dinitroethylene, tritonal;
Described polymer composite contains a kind of in nitro-cotton, polyvinyl butyral acetal, cellulose acetate butyrate, cellulose acetate, polyurethane-type thermoplastic elastomer, glycidyl azide polymer, 3-azido-methyl-3-methyl butylene oxide ring polymkeric substance, 3,3-two (azido-methyl) butylene oxide ring polymkeric substance and more than one mixture;
The solvent of described dissolving single chmical compound explosive is one or more mixture of ethyl acetate, butylacetate, butanols, butanone, pimelinketone, and the mass ratio of this solvent and single chmical compound explosive is 10-50;
The solvent dissolving polymer composite is one or more mixture of ethyl acetate, butylacetate, butanols, butanone, pimelinketone, and the mass ratio of this solvent and polymer composite is 2-20.
Step 2, single chmical compound explosive solution step 1 obtained mix under whipped state with polymeric sol, obtain the polymeric sol containing single chmical compound explosive; The volume ratio of single chmical compound explosive solution and polymeric sol is: (1:10) ~ (5:1).
Step 3, the polymeric sol containing single chmical compound explosive step 2 obtained are distributed in the aqueous solution containing dispersion agent and disperse under whipped state, and the polymeric sol containing single chmical compound explosive is dispersed into spherical droplets;
Described dispersion agent is: gelatin, gelatine, gum arabic, polyoxyethylene glycol, polyacrylamide, polyvinyl alcohol or methylcellulose gum; The concentration of aqueous dispersant is: 0.05%-1%; Aqueous dispersant with the volume ratio of the polymeric sol containing single chmical compound explosive is: 1.0-3.0; Temperature of charge during dispersion is: 20 DEG C-65 DEG C.
Solvent in step 4, the material that step 3 obtained distills away, dispersion spherical droplets progressively cirrhosis Cheng Hanneng solid particulate in aqueous;
Step 5, through solid-liquid separation, solid particles surface washing and dry, obtain including ultra-fine single chmical compound explosive containing can composite particles.
Compared with prior art, its remarkable advantage is in the present invention: 1) method of the present invention does not need through superfine grinding, is directly distributed in macromolecular material by oarse-grained single chmical compound explosive, and the particle diameter of single chmical compound explosive is dropped to micron order or nano level.2) dispersing and mixing process is carried out under large water gaging existent condition, and technological process is safer.3) single chmical compound explosive disperse in polymer evenly, significantly can improve the stability of composite material containing energy.
Embodiment
Described in more detail below, the super-refinement dispersing method of single chmical compound explosive of the present invention in composite material containing energy, step is:
(1) material dissolution: step 1, single chmical compound explosive is dissolved in solvent obtains single chmical compound explosive solution, solvent load be polymer composite quality 10-50 doubly, namely solvent ratio is 10-50.Be dissolved in solvent by polymer composite and obtain polymeric sol, solvent ratios is polymer composite quality 2-20 times.Described single chmical compound explosive is Cyclotrimethylene trinitramine, octogen, hexanitro-six azepine isoamyl one or more the mixture hereby in alkane, hexanitro-stilbene, trinitro-isophthalic triamine, TNAZ, diamino-dinitroethylene.Described polymer composite is at least containing the one in nitro-cotton, polyvinyl butyral acetal, cellulose acetate butyrate, cellulose acetate, polyurethane-type thermoplastic elastomer, glycidyl azide polymer, 3-azido-methyl-3-methyl butylene oxide ring polymkeric substance, 3,3-two (azido-methyl) butylene oxide ring polymkeric substance.Described solvent is one or more mixture of ethyl acetate, butylacetate, butanols, butanone, pimelinketone, preferably selects solvent single chmical compound explosive and polymer composite all to excellent dissolution performance.Solvent temperature is determined according to solvent species used, should not higher than the azeotropic point of the boiling point of solvent or mixed solvent.The material dissolution time is determined according to material category and granular size, and under room temperature or heating condition, dissolution time is 10-120min.Independent dissolver batch process can also be adopted or prepare polymeric sol continuously.
(2) mixing of materials: single chmical compound explosive solution mixes under whipped state with polymeric sol, obtains the polymeric sol containing single chmical compound explosive; Single chmical compound explosive solution is 1:10-5:1 with the relative volume ratio of polymeric sol.In mixing of materials process, the nonionic surface active agent of the series such as OP or TX can be added in solution or colloidal sol, to ensure material dispersion and mixing of materials state evenly; The add-on of tensio-active agent is determined according to its kind, and usual add-on is the 0.002%-0.05% of solvent total mass used.Under room temperature or heating condition, carry out mixing of materials, the temperature of heating is not higher than the boiling point of solvent or the azeotropic point of mixed solvent, and the mixing of materials time is preferably 10min-240min; The temperature of mixing of materials process system is consistent with material dissolution process substantially.
(3) balling-up is disperseed: be distributed under whipped state by the polymeric sol containing single chmical compound explosive obtained after mixing of materials in the aqueous solution containing dispersion agent and disperse, the polymeric sol containing single chmical compound explosive under the acting in conjunction of stirring shearing force and interfacial tension is dispersed into spherical droplets; The kind of dispersion agent can select the water-soluble natural polymers such as gelatin, gelatine, gum arabic, also can select the water-soluble synthesis polymers such as polyoxyethylene glycol, polyacrylamide, polyvinyl alcohol, methylcellulose gum.In aqueous dispersant, the mass concentration of dispersion agent is 0.05%-1%.The described aqueous solution containing dispersion agent can be the mother liquor that last time, single chmical compound explosive dispersion process reclaimed.The effect adding dispersion agent in the aqueous solution prevents the spherical droplets containing single chmical compound explosive and macromolecular material from mutually assembling to spherical droplets protection.Be used as dispersion balling-up by volume to measure containing the aqueous solution of dispersion agent or the add-on of mother liquor, for material dissolution stage gained is containing 1.0-3.0 times of the polymeric sol volume of single chmical compound explosive.Single chmical compound explosive dispersion process time used is preferably at 10min-90min; System temperature is basic to be consistent with mixing of materials process, and keep 20 DEG C-65 DEG C when employing ethyl acetate solvent, single chmical compound explosive dispersion process temperature can slowly promote, but should not exceed the boiling point of solvent for use or the azeotropic point of mixed solvent.
(4) solvent distillation: at normal pressure Elevated Temperature Conditions or under vacuumizing state, or simultaneously under intensification and vacuumized conditions, solvent in the material obtain dispersion globulation distills away, dispersion spherical droplets progressively cirrhosis Cheng Hanneng solid particulate in aqueous; The main operating parameters of described solvent still-process is: the time, temperature progressively improved along with the recovery of solvent, when temperature exceedes boiling point or the mixed solvent azeotropic point more than 10 DEG C of solvent, keeps more than 10min that solvent can be stopped to distill at 20min-240min.When adopting ethyl acetate to make solvent, as molten in adopted normal pressure to steam, temperature reaches 87 DEG C and keeps more than 10min that solvent can be stopped to distill.
(5) feed separation: after solvent distillation terminates, the general type of cooling is adopted to drop to close to room temperature by the temperature of material, or directly by the mode of centrifugation or filtration, the solid particulate containing single chmical compound explosive is separated with the aqueous solution, the filtrate of separating is called mother liquor, containing tensio-active agent, dispersion agent and solvent in mother liquor, can when next single chmical compound explosive dispersion as dispersion medium recycle.Adopt hot water to wash solid particles surface, drive away the dispersion agent that particle surface adheres to, then solid particulate is dried.
(6) dry: adopt conventional method to carry out drying and processing solid particulate, obtain the composite material containing energy containing ultra-fine single chmical compound explosive.The solid particulate that solid-liquid separation obtains can adopt conventional mode to carry out drying and processing, and the best warm air of drying plant used, hot water etc. are as heat source, and top temperature is preferably lower than 100 DEG C, to guarantee safety.About oven dry and dehydration equipment should have good anti-static precautions to guarantee safety.
In order to implementation condition of the present invention is described better, carry out citing below and set forth, these processes and processing condition do not represent the whole of invention, as long as can be used without prejudice to the measure of innovative idea of the present invention.
Embodiment 1:
Selecting median size to be the Cyclotrimethylene trinitramine of 150 microns is single chmical compound explosive raw material, select nitro-cotton 68%, nitroglycerine to be 30%, the double-base powder of tranquilizer 1.5% as polymer composite, adopt the inventive method Cyclotrimethylene trinitramine to be distributed in double-base powder matrix and prepare the composite modified double-base powder particle of high energy.First, at 60-65 DEG C of temperature, Cyclotrimethylene trinitramine is dissolved in 10 times of ethyl acetate solvents relative to its quality, obtains the ethyl acetate solution containing hexogen.Be dissolved at the same temperature by double-base powder in the ethyl acetate relative to its quality 9 times, dissolution time is 30min-60min again, obtains the polymeric sol containing nitro-cotton.Then, mixed with the polymeric sol containing nitro-cotton by the ethyl acetate solution of Cyclotrimethylene trinitramine, the mass ratio of two kinds of liquid materials is 1:3, obtains the polymeric sol containing Cyclotrimethylene trinitramine.Under 50 DEG C of-65 DEG C of temperature condition, the polymeric sol containing Cyclotrimethylene trinitramine is distributed to 2 times and disperses containing in the aqueous solution of dispersion agent of its volume, adopt gelatin as dispersion agent, the mass concentration of aqueous dispersant is 0.5%.Under the mixing speed of 300-350rpm, disperse 30min, the polymeric sol containing Cyclotrimethylene trinitramine is progressively dispersed into more uniform spherical drop.Then, slowly heat up and progressively distilled by solvent, spherical droplets is hardened gradually, and molecularity Cyclotrimethylene trinitramine crystallizes out from colloidal sol simultaneously, and is distributed to equably in spheroidal particle.Continue to keep 10min after temperature is raised to 85 DEG C, cooling down material, is separated solid particulate with the aqueous solution, and the mother liquor separated saves and be used as dispersion medium in upper once dispersion process.The solid particulate separated, is placed in safe baking oven at 50 DEG C of temperature dry 24 hours.Be 24.6% to the Cyclotrimethylene trinitramine content measuring result in sample, obtain containing can the median size of Cyclotrimethylene trinitramine in solid particulate be 3.4 μm by Electronic Speculum measurement.Fig. 1 is the shape appearance figure of modified double base medicine particle by observation by light microscope containing ultra-fine Cyclotrimethylene trinitramine that the present embodiment obtains.
Embodiment 2
Selecting median size to be the Cyclotrimethylene trinitramine of 150 microns is single chmical compound explosive raw material, select nitro-cotton and polyvinyl butyral acetal respectively to account for the mixing material of 50% as polymer composite, adopt the inventive method Cyclotrimethylene trinitramine to be distributed to preparation in polymer composite and contain energy composite particles.First, at 40-50 DEG C of temperature, Cyclotrimethylene trinitramine is dissolved in 19 times of ethyl acetate solvents relative to its quality, obtains the ethyl acetate solution containing hexogen.Nitro-cotton and polyvinyl butyral acetal are dissolved at the same temperature in the ethyl acetate relative to its quality 15 times, dissolution time is 30min-60min again, obtains the polymeric sol containing nitro-cotton and polyvinyl butyral acetal.Then, mixed with polymeric sol by the ethyl acetate solution of Cyclotrimethylene trinitramine, the ethyl acetate solution of Cyclotrimethylene trinitramine and the mass ratio of polymeric sol are 1:2, obtain the polymeric sol containing Cyclotrimethylene trinitramine after mixing.Under 40 DEG C of-50 DEG C of temperature condition, the polymeric sol containing Cyclotrimethylene trinitramine is distributed to 1 times and disperses containing in the aqueous solution of dispersion agent of its volume, adopt gelatine as dispersion agent, the mass concentration of aqueous dispersant is 0.5%.Under the mixing speed of 300-350rpm, disperse 30min, the polymeric sol containing Cyclotrimethylene trinitramine is progressively dispersed into more uniform spherical drop.Then, slowly heat up and progressively distilled by solvent, spherical droplets is hardened gradually, and molecularity Cyclotrimethylene trinitramine crystallizes out from colloidal sol simultaneously, and is distributed to equably in spheroidal particle.Continue to keep 10min after temperature is raised to 85 DEG C, cooling down material, is separated solid particulate with the aqueous solution, and the mother liquor separated saves and be used as dispersion medium in upper once dispersion process.The solid particulate separated, is placed in safe baking oven at 50 DEG C of temperature dry 24 hours.Be 35.6% to the Cyclotrimethylene trinitramine content measuring result in sample, obtain containing can the median size of Cyclotrimethylene trinitramine in solid particulate be 7.9 μm by Electronic Speculum measurement.Fig. 2 is the shape appearance figure of composite particles by observation by light microscope containing ultra-fine Cyclotrimethylene trinitramine that the present embodiment obtains.
Embodiment 3
Select median size to be the octogen of 180 microns and median size to be 150 microns of Cyclotrimethylene trinitramine etc. the mixture of mass ratio as single chmical compound explosive raw material, select single-base powder containing nitro-cotton 97% as polymer composite, adopt the inventive method octogen and Cyclotrimethylene trinitramine to be distributed in polymer composite preparation containing can composite particles.First, at 30-40 DEG C of temperature, the mixture of Cyclotrimethylene trinitramine and octogen is dissolved in the ethyl acetate solvent of 29 times relative to its quality, obtains the ethyl acetate solution containing single chmical compound explosive.Be dissolved at the same temperature by single-base powder in the ethyl acetate relative to its quality 14 times, dissolution time is 30min-60min again, obtains the polymeric sol containing nitro-cotton.Then, mixed with polymeric sol by the ethyl acetate solution of single chmical compound explosive, the ethyl acetate solution of single chmical compound explosive and the mass ratio of polymeric sol are 2:1, obtain the polymeric sol containing single chmical compound explosive after mixing.Under 20 DEG C of-40 DEG C of temperature condition, the polymeric sol containing single chmical compound explosive is distributed to 3 times and disperses containing in the aqueous solution of dispersion agent of its volume, adopt gum arabic as dispersion agent, the mass concentration of aqueous dispersant is 0.5%.Under the mixing speed of 300-350rpm, disperse 30min, the polymeric sol containing single chmical compound explosive is progressively dispersed into more uniform spherical drop.Then, slowly heat up and progressively distilled by solvent, spherical droplets is hardened gradually, and molecularity single chmical compound explosive crystallizes out from colloidal sol simultaneously, and is distributed to equably in spheroidal particle.Continue to keep 10min after temperature is raised to 85 DEG C, cooling down material, is separated solid particulate with the aqueous solution, and the mother liquor separated saves and be used as dispersion medium in upper once dispersion process.The solid particulate separated, is placed in safe baking oven at 50 DEG C of temperature dry 24 hours.Add up to 48.6% to the content measuring result of Cyclotrimethylene trinitramine in sample and octogen, the median size obtained containing the single chmical compound explosive particle in energy solid particulate by Electronic Speculum measurement is 6.5 μm.Fig. 3 is the SEM figure of the composite particles containing ultra-fine single chmical compound explosive that the present embodiment obtains.
Embodiment 4-11
Adopt the technological process identical with embodiment 1, select different types of single chmical compound explosive, nitroglycerine content is adopted to be that the double-base powder of 30% is as polymer composite, select ethyl acetate as the solvent dissolving explosive raw material and polymer composite, dispersion balling-up aqueous dispersant consumption used is 2 times of the polymeric sol volume containing single chmical compound explosive, the kind of single chmical compound explosive, the solvent ratio that single chmical compound explosive solution is used, the solvent ratio that double-base powder colloidal sol is used, the relative volume ratio of single chmical compound explosive solution and polymeric sol, what obtain sees the following form containing the median size of single chmical compound explosive in energy composite particles.
Embodiment 12-18
Adopt the technological process identical with embodiment 1, selecting median size to be the octogen of 180 microns is single chmical compound explosive raw material, select the polymer composite containing different sorts tackiness agent, adopt acetic acid ethyl dissolution explosive raw material and polymer composite, dispersion balling-up aqueous dispersant consumption used is 2 times of the polymeric sol volume containing single chmical compound explosive, solvent species, preparation single chmical compound explosive solution and double-base powder colloidal sol solvent ratio used, the relative volume ratio of single chmical compound explosive solution and polymeric sol, what obtain sees the following form containing the median size of single chmical compound explosive in energy composite particles.
Embodiment 19-23
Adopt the technological process identical with embodiment 1, selecting median size to be the Cyclotrimethylene trinitramine of 150 microns is single chmical compound explosive raw material, nitroglycerine content is adopted to be that the double-base powder of 30% is as polymer composite, select different dissolution with solvents explosive raw materials and polymer composite, dispersion balling-up aqueous dispersant consumption used is 2 times of the polymeric sol volume containing single chmical compound explosive, solvent species, the solvent ratio that preparation single chmical compound explosive solution is used, the solvent ratio that preparation double-base powder colloidal sol is used, the relative volume ratio of single chmical compound explosive solution and polymeric sol, what obtain sees the following form containing the median size of single chmical compound explosive in energy composite particles.
Embodiment 24-29
Adopt the technological process identical with embodiment 1, selecting median size to be the Cyclotrimethylene trinitramine of 150 microns is single chmical compound explosive raw material, nitroglycerine content is adopted to be that the double-base powder of 40% is as polymer composite, adopt ethyl acetate as the solvent dissolving Cyclotrimethylene trinitramine and double-base powder, solvent load is respectively 20 times of Cyclotrimethylene trinitramine and double-base powder quality, single chmical compound explosive solution is 1:2 with the relative volume ratio of polymeric sol, dispersion balling-up aqueous dispersant consumption used is 2 times of the polymeric sol volume containing single chmical compound explosive, only change dispersant used and concentration in material dispersion process, other conditions are identical with embodiment 1.What obtain sees the following form containing the median size of single chmical compound explosive in energy composite particles.
Can be illustrated by above embodiment, adopt the inventive method safely and efficiently single chmical compound explosive can be distributed to polymer composite, and single chmical compound explosive is distributed to micron order, do not need through superfine grinding, just can directly oarse-grained single chmical compound explosive be distributed in macromolecular material equably.Dispersing and mixing process is carried out under large water gaging existent condition, process safety.

Claims (3)

1. the super-refinement dispersing method of single chmical compound explosive in composite material containing energy, is characterized in that, comprise the following steps:
Step 1, single chmical compound explosive is dissolved in solvent obtains single chmical compound explosive solution, polymer composite is dissolved in solvent and obtains polymeric sol;
Step 2, single chmical compound explosive solution step 1 obtained mix under whipped state with polymeric sol, obtain the polymeric sol containing single chmical compound explosive, the volume ratio of single chmical compound explosive solution and polymeric sol is: (1:10) ~ (5:1);
Step 3, the polymeric sol containing single chmical compound explosive step 2 obtained are distributed in the aqueous solution containing dispersion agent and disperse under whipped state, and the polymeric sol containing single chmical compound explosive is dispersed into spherical droplets;
Solvent in step 4, the material that step 3 obtained distills away, dispersion spherical droplets progressively cirrhosis Cheng Hanneng solid particulate in aqueous;
Step 5, through solid-liquid separation, solid particles surface washing and dry, obtain including ultra-fine single chmical compound explosive containing can composite particles.
2. the super-refinement dispersing method of single chmical compound explosive according to claim 1 in composite material containing energy, it is characterized in that, the single chmical compound explosive described in step 1 is Cyclotrimethylene trinitramine, octogen, hexanitro-six azepine isoamyl one or more the mixture hereby in alkane, hexanitro-stilbene, trinitro-isophthalic triamine, TNAZ, diamino-dinitroethylene, tritonal;
Described polymer composite contains a kind of in nitro-cotton, polyvinyl butyral acetal, cellulose acetate butyrate, cellulose acetate, polyurethane-type thermoplastic elastomer, glycidyl azide polymer, 3-azido-methyl-3-methyl butylene oxide ring polymkeric substance, 3,3-two (azido-methyl) butylene oxide ring polymkeric substance and more than one mixture;
The solvent of described dissolving single chmical compound explosive is one or more mixture of ethyl acetate, butylacetate, butanols, butanone, pimelinketone, and the mass ratio of this solvent and single chmical compound explosive is 10-50;
The solvent dissolving polymer composite is one or more mixture of ethyl acetate, butylacetate, butanols, butanone, pimelinketone, and the mass ratio of this solvent and polymer composite is 2-20.
3. the super-refinement dispersing method of single chmical compound explosive according to claim 1 in composite material containing energy, it is characterized in that, in step 3, dispersion agent is: gelatin, gelatine, gum arabic, polyoxyethylene glycol, polyacrylamide, polyvinyl alcohol or methylcellulose gum;
The concentration of aqueous dispersant is: 0.05%-1%; Aqueous dispersant with the volume ratio of the polymeric sol containing single chmical compound explosive is: 1.0-3.0; Temperature of charge during dispersion is: 20 DEG C-65 DEG C.
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