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Preparation method of high-strength spherical agglomerated boron particles

A high-strength, spherical technology, applied in the direction of explosives, etc., can solve the problems of difficult ignition of secondary combustion, large particle size of boron powder, full combustion, etc., and achieve the effect of increased density, controllable particle size, and unbreakable effect

Inactive Publication Date: 2010-08-18
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the surface coating can improve the process and combustion performance of the propellant to a certain extent, the particle size of the surface-coated boron powder is small and the specific surface area is large. It is still difficult to increase the amount of boron powder added to the propellant, so that the burning rate and burning The improvement of the velocity pressure index is very limited; to meet the needs of engineering applications, agglomeration of boron powder is an effective way
U.S. Patent 3,646,174 once reported a process for agglomerating and granulating amorphous boron powder, which can prepare granulated boron powder, but uses a large amount of chlorinated hydrocarbon as solvent and directly discharges it in the air, which cannot be recovered, and the obtained The particle size of boron powder is relatively large, but the boron powder with large particle size has problems such as low primary combustion injection efficiency, difficulty in ignition and sufficient combustion in secondary combustion, etc.

Method used

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  • Preparation method of high-strength spherical agglomerated boron particles
  • Preparation method of high-strength spherical agglomerated boron particles
  • Preparation method of high-strength spherical agglomerated boron particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In a planetary vertical kneader, 8.5 g of polyurethane prepolymer binder hydroxyl-terminated polybutadiene (HTPB, E OH =7.8×10 -4 mol / g) was dissolved in 170ml of ethyl acetate, and 0.6g of 1,4-toluene diisocyanate curing agent (TDI) was added to premix evenly (control the temperature of the material at 30±5°C), and then 85g of boron powder was added to the above premixed material Mix well, and finally dissolve 0.03g dibutyltin dilaurate (T-12) in 0.5g ethyl acetate, add to the above mixture and mix thoroughly; pass the obtained granular materials through 60 mesh to 80 mesh and a 100-140-mesh standard sieve, and vacuum-dry at 50°C for 72 hours.

[0026] Performance Testing

[0027] 1. Particle strength test

[0028] The testing instrument is ZQJ-II intelligent particle strength testing machine.

[0029] Test method: The agglomerated boron particles are sieved by a standard sampling sieve, and classified according to the particle size. In order to make the experiment...

Embodiment 2

[0051]2g of surface modifier TMP was dissolved in 200ml of acetone, 98g of amorphous boron powder was added, stirred and reacted at 50°C for 24h, and the solvent was removed by vacuum drying at 70°C to obtain surface-modified boron powder. In a planetary vertical kneader, 8.5g of polyurethane prepolymer binder hydroxyl-terminated polybutadiene (HTPB, hydroxyl value: 7.8×10 -4 mol / g) was dissolved in 170ml of ethyl acetate, and 5g of ammonium perchlorate and 0.6g of 1,4-toluene diisocyanate curing agent (TDI) were added to premix evenly, and the temperature of the material was controlled at 30±5°C; 85g of surface modified Add boron powder to the above premixed material and mix thoroughly; dissolve 0.03g of dibutyltin dilaurate (T-12) in 0.5g of ethyl acetate, add to the above mixed material and mix thoroughly; pass the obtained granular material 60 mesh to 80 mesh and 100 mesh to 140 mesh standard sieve, vacuum dried at 50°C for 72 hours.

[0052] Performance Testing

[0053]...

Embodiment 3

[0059] The implementation method of this example is basically the same as that of Example 2, except that the adhesive prepolymer uses carboxyl-terminated polybutadiene, and the amount is 9.0g, the curing agent is HDI, and the amount is 1.05g, and the amount of ammonium perchlorate is 7.0 g.

[0060] Performance Testing

[0061] The test apparatus and test method are the same as in Example 1, and the results are shown in Table 7 and Table 8 below.

[0062] Particle strength of table 7 agglomerated boron powder

[0063]

[0064] Table 8 Boron powder density results and rheological properties of B / HTPB suspension

[0065]

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Abstract

The invention discloses a preparation method of high-strength spherical agglomerated boron particles, which comprises the following steps: (1) dissolving 8-9 weight parts of polyurethane prepolymer adhesive into 15-25 times of ethyl acetate or ethanol to be uniformly mixed with 0.5-1.2 weight parts of isocyanate curing agents to obtain premix; (2) adding 80-95 weight parts of amorphous boron powder into the premix to be mixed; (3) adding 0.02-0.05 weight part of curing catalyst; and (4) screening the obtained particle materials with a standard screen of 60-140 meshes, and carrying out vacuum drying. The boron particles prepared by the method of the invention have higher strength and can not be broken easily when being added into propellants, and the obtained agglomerated boron particles have controllable particle size and higher granulating rate.

Description

technical field [0001] The invention relates to a method for preparing high-strength spherical agglomerated boron particles, in particular to a method for preparing agglomerated boron particles for fuel-rich propellants. Background technique [0002] Boron powder has the advantages of high mass calorific value and volume calorific value, high density, etc., and is the preferred fuel for fuel-rich propellants for solid rocket ramjet engines. Due to the H contained on the surface of the amorphous boron powder 3 BO 3 Acidic impurities, such as acidic impurities, condense with the hydroxyl groups of the hydroxyl-terminated polybutadiene (HTPB) binder prepolymer, so that the viscosity of the propellant slurry increases sharply, so that it cannot be casted. In addition, other impurities in amorphous boron powder such as magnesium powder, MgCl 2 , MgO, MgB 2 , B 2 o 3 etc. Some are easy to absorb moisture, and it is easy to make the surface of boron particles absorb a large a...

Claims

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Application Information

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IPC IPC(8): C06B45/10
Inventor 庞维强樊学忠赵凤起廖林泉胥会祥冉秀伦黄小梧李勇宏蔚红建梁勇
Owner XIAN MODERN CHEM RES INST
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