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A kind of ultrafine guanidine nitrate for gas generator and its preparation process

A gas generator and preparation technology, which is applied in the field of ultrafine guanidine nitrate, can solve the problems that fumed silica is difficult to ensure uniform distribution, fumed silica is too expensive, and product prices rise, so that the particle size and distribution can meet, Prevent agglomeration and agglomeration and save cost

Active Publication Date: 2018-09-11
襄阳汉伟化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of doing this is that fumed silica is too expensive, and adding too much will cause the product price to rise too much; second, because the bulk density difference between fumed silica and guanidine nitrate is too large, it is difficult to ensure uniform Dispersed in guanidine nitrate, the product is easy to separate, resulting in unstable performance in use
This brings great inconvenience to the production arrangement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Crude guanidine nitrate with a guanidine nitrate content greater than 98%, a pH value of 5.1-6.0, and a moisture content of less than 0.2% was pulverized with a vibration mill for 2 hours to obtain a guanidine nitrate fine powder with a particle size of less than 100 mesh;

[0030] Add 1% of an anti-caking agent fumed silica with a particle size of 0.5 μm and mix in a multidirectional motion mixer for 1 hour;

[0031] Continue to use the vibration mill to pulverize for 4 hours to obtain a fine powder of guanidine nitrate with a particle size less than 400 meshes;

[0032] Add 1% boron nitride with a particle size of 5 microns and 2% kaolin clay with a particle size of 40 microns and mix in a multidirectional motion mixer for 1 hour.

[0033] Use the vibration mill again to process for 30 minutes to obtain the finished product of ultrafine guanidine nitrate.

Embodiment 2

[0035] Crude guanidine nitrate with a guanidine nitrate content greater than 98%, a pH value of 5.1-6.0, and a moisture content of less than 0.2% was pulverized with a vibration mill for 2 hours to obtain a guanidine nitrate fine powder with a particle size of less than 100 mesh;

[0036] Adding 0.4% particle diameter is the anti-caking agent fumed silica of 0.5 micron and 0.8% particle diameter is the ultrafine polystyrene microsphere of 0.1 micron, and handles 0.5 hour in vibrating mill;

[0037] Use jet mill to pulverize for 1 hour to obtain fine powder of guanidine nitrate with particle size less than 400 mesh;

[0038] Add 3% mica powder with a particle size of 22 microns, 5% kaolin with a particle size of 40 microns, and 1% graphite powder with a particle size of 5 microns, and process it in a jet mill for 1.5 hours to obtain an ultrafine guanidine nitrate product.

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Abstract

The invention provides superfine guanidine nitrate for a gas generator and a preparation technology of the superfine guanidine nitrate. The superfine guanidine nitrate comprises the following raw materials by weight: 100 parts of guanidine nitrate, 1 to 3 parts of an anti-caking agent A, and 1 to 10 parts of an anti-caking agent B, wherein the anti-caking agent A is one or a mixture of several of superfine polystyrene microspheres, gas-phase or settled silica, or other high-molecule polymerization materials; the anti-caking agent B is one or a powder mixture of several of the anti-caking agent A, kaolin powder, clay powder, graphite powder, boron nitride powder, magnesium stearate powder, mica powder and talcum powder. The superfine guanidine nitrate can be directly added into an aerogenic drug of the gas generator used for an automobile safe air bag, and has the advantages that the technological process of adding a slagging agent into the aerogenic drug is eliminated; the particle size and the distribution meet use requirements; the product can be stored for a long time without caking or layering; the property is stable; the environmental sensitiveness is low; the superfine guanidine nitrate is prevented from clustering and caking.

Description

technical field [0001] The invention relates to an ultrafine guanidine nitrate used in an automobile safety airbag gas generator and a preparation process thereof. Background technique [0002] The airbag gas generator contains high-efficiency gas-generating agents inside, and an air bag is connected to the outside. Usually the air bag is folded and put into the steering wheel or the co-pilot trim panel and seat together with the gas generator. When the car collides in an accident and the signal is very strong, the central control unit sends an ignition command, the gas generator is ignited, the internal medicine burns, and high-temperature expansion gas is released. After the gas passes through the cooling device, it is filled into the folded air bag, and the driver Or passengers are isolated from the interior of the car to avoid or reduce personal injury. [0003] The gas generating agent for the gas generator is currently mainly of the guanidine nitrate type, and its co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C06D5/00
Inventor 张群
Owner 襄阳汉伟化工科技有限公司