Method for granulating amorphous boron powder

An amorphous boron powder and granulation technology, which is applied in the methods of granulating raw materials, chemical instruments and methods, chemical/physical processes, etc. problems, to achieve the effect of small yield value and apparent viscosity, long pot life and low environmental damage

Inactive Publication Date: 2009-09-16
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can prepare granulated boron powder, but a large amount of chlorinated hydrocarbons which have a damaging effect on the atmospheric ozone layer are used as solvents, and the chlorinated hydrocarbon solvents are directly discharged into the air and cannot be recovered, which is a process method that greatly damages the env

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]In the kneading pot of a 2L vertical kneader, add 50ml ethyl acetate, 9.40g HTPB binder prepolymer (hydroxyl value: 0.67mmol / g), 0.60g TDI curing agent and 0.1gTPB ​​curing catalyst in sequence, and use bamboo chips Premix evenly, start the heating cycle system, and control the temperature of the material during kneading to 40°C. Add amorphous boron powder (92% B content, 1μm particle size) into the kneading pot in 3 steps, add 70g for the first time, start kneading after pre-mixing evenly, and control the speed of the stirring paddle at 20-25r / min during the kneading process , stop kneading after 30 minutes, clean up the material on the stirring paddle and the wall of the pot; add 20g of boron powder to the kneading pot for the second time, knead for 10 minutes after premixing, then stop kneading, and clean up the materials on the kneading pulp and the wall of the pot; Add 10g of boron powder to the kneading pot once, knead for 20min after premixing, then stop kneading,...

Embodiment 2

[0046] The implementation method of this example is basically the same as Example 2, except that the adhesive prepolymer uses polyethylene glycol-tetrahydrofuran copolymer (PET) with an amount of 9.10 g, and the curing agent uses N-100 with an amount of 0.90 g.

[0047] Performance Testing

[0048] The test apparatus and test method are the same as in Example 1, and the results are shown in Table 3 below.

[0049] Table 3 Properties of amorphous boron powder

[0050] sample name pH Yield value (Pa) Apparent viscosity (Pa·s) Amorphous boron powder raw material 5.13 85.3 64.5 Granulating Amorphous Boron Powder 7.21 72.7 50.1

Embodiment 3

[0052] The implementation method of this example is basically the same as Example 1, except that IPDI is used as the curing agent, and the dosage is 0.70g, while the dosage of HTPB is 9.30g.

[0053] Performance Testing

[0054] The test apparatus and test method are the same as in Example 1, and the results are shown in Table 4 below.

[0055] Table 4 Properties of amorphous boron powder

[0056] sample name pH Yield value (Pa) Apparent viscosity (Pa·s) Amorphous boron powder raw material 5.13 85.3 64.5 Granulating Amorphous Boron Powder 7.35 75.4 52.7

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PUM

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Abstract

The invention discloses a method for granulating amorphous boron powder, and in particular relates to a method for kneading and granulating amorphous boron powder for fuel-rich propellant. The method for granulating amorphous boron powder comprises the following steps: (1) premixing ethyl acetate, liquid polyurethane adhesive prepolymer, isocyanate curing agents and curing catalyst well according to a mass ratio which is 40-50:8-9:1-2:0.1-0.05 and controlling material temperature to between 35 and 40 DEG C; (2) mixing the amorphous boron powder with the premixed material; and (3) passing the obtained granular material through a 30-mesh standard sieve and drying the obtained granular material. In the process of granulating the amorphous boron powder, the method adopts the ethyl acetate which has little harm to environment and low dosage as a solvent for dispersing adhesive, and adopts a star-type stirring paddle to ensure that agglomerate mixtures can be denser under the cutting and extruding action of the stirring paddle. Granules obtained by the method are high in strength, are not easy to break when the granules are applied in formulations of fuel-rich propellant, and enable medicine pulp to be low in yield value and apparent viscosity.

Description

technical field [0001] The invention relates to a granulation method of amorphous boron powder, in particular to a kneading granulation method of amorphous boron powder for fuel-rich propellants. Background technique [0002] The specific impulse of the solid rocket ramjet is higher than that of the solid rocket motor, and it is the most promising type of engine in the 21st century. The propellant used in the solid rocket ramjet is a fuel-rich propellant. As a fuel, boron not only has high mass combustion calorific value and volume calorific value, but also has many advantages such as "clean" in its combustion products. The development of boron-containing propellants has attracted widespread attention in various countries. [0003] Since the amorphous boron powder contains B 2 o 3 、H 3 BO 3 and other acidic impurities, the literature reports that the pH value of its suspension reaches 4.0-4.5. The acidic impurities are prone to cross-linking reactions with the hydroxyl...

Claims

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Application Information

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IPC IPC(8): C06B45/00B01J2/00
Inventor 胥会祥赵凤起廖林泉李勇宏庞维强张楠楠冉秀伦孙志化丁黎
Owner XIAN MODERN CHEM RES INST
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