CN108409514A - A kind of preparation process of the ultra-fine guanidine nitrate of safe automobile air bag - Google Patents
A kind of preparation process of the ultra-fine guanidine nitrate of safe automobile air bag Download PDFInfo
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- CN108409514A CN108409514A CN201810187699.5A CN201810187699A CN108409514A CN 108409514 A CN108409514 A CN 108409514A CN 201810187699 A CN201810187699 A CN 201810187699A CN 108409514 A CN108409514 A CN 108409514A
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- Prior art keywords
- guanidine nitrate
- fine
- ultra
- powder material
- air bag
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Classifications
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06D—MEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART)
- C06D5/00—Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets
- C06D5/04—Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets by auto-decomposition of single substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
- B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Air Bags (AREA)
Abstract
The invention discloses a kind of safe automobile air bag preparation processes of ultra-fine guanidine nitrate, include the following steps：1) guanidine nitrate raw material is subjected to preliminary mechanical crushing, obtains granularity less than the first powder of the guanidine nitrate of 200 mesh；2) powder input high pressure fluidized bed jet mill at the beginning of guanidine nitrate is crushed, obtains guanidine nitrate level-one fine powder material；3) anti-caking agent is added in the guanidine nitrate fine powder material obtained to previous step by 1 1.4% ground weight ratio, and be uniformly mixed；4) the guanidine nitrate fine powder material input disk-type jet mill that previous step is mixed with to anti-caking agent disperses, and obtains ultra-fine guanidine nitrate finished product.The present invention has creatively selected the addition opportunity of anti-caking agent, the type and disintegrating apparatus appropriate of anti-caking agent, processing sequence and technological parameter, required granularity requirements when the ultra-fine guanidine nitrate produced being enable to reach for automobile airbag inflation agent.
Description
Technical field
The present invention relates to safe automobile air bags, and in particular to a kind of preparation work of the ultra-fine guanidine nitrate of safe automobile air bag
Skill.
Background technology
With the continuous improvement of traffic safety consciousness, safe automobile air bag is just gradually being widely used in China.Its work
Principle is that when a vehicle is in a collision, control module quickly handles it to signal, confirms that the severity to collide has surpassed
The protective capability for going out safety belt, just discharges rapidly air bag, and the head of occupant, chest is made directly to be connect with more soft and elastic air bag
It touches, to mitigate the injury of occupant by the cushioning effect of air bag.
Airbag inflated agent is generally required to light within the time that traffic accident occurs 50 to 60 milliseconds and be generated rapidly a large amount of
Non-toxic gas, and can ensure after once filling 10 to 15 years effectively, can waterproof, cold-proof, high temperature resistant, and current automobile
Air bag filler is still not ideal enough.
Guanidine nitrate meets high temperature meeting decomposition explosion, and in recent years, ultra-fine guanidine nitrate is used as substituting the vapour of new generation of sodium azide
The Main Components of vehicle airbag inflated agent.When ultra-fine guanidine nitrate is used as the Main Components of automobile airbag inflation agent,
Granularity requirements are：D50=4.5-6.5 μm, D98≤14 μm, and granularity is in normal distribution, but due to the easy moisture absorption of guanidine nitrate, it is special
It is not during super-fine processing, because of the moisture content in the moisture content and air of material itself, when the granularity of guanidine nitrate reaches several μm
At even tens μm or less, the surface area of material is significantly increased, and particle adhesion easily occurs because of the moisture absorption, generates caking, knot
Group's phenomenon, therefore difficulty of processing is very big, moisture that equally can be because of itself during long-term transport, storage, use and contact
Caking, clustering phenomena occur for air.
Existing processing method is that anti-caking agent is first added in guanidine nitrate raw material, is then crushed again, still, due to anti-
The volume and proportion and guanidine nitrate feed particles of knot agent particle are much smaller, and during crushing, anti-caking agent particle is by high pressure
Air-flow is blown away, thus anti-caking agent do not have anti-caking, conglomeration effect, thus its finished product is difficult to reach required granularity requirements.
Invention content
The present invention provides a kind of preparation process of the ultra-fine guanidine nitrate of safe automobile air bag, and main purpose is to overcome existing
There is the shortcomings that ultra-fine guanidine nitrate processing technology is difficult to fineness required by reaching safe automobile air bag.
The present invention adopts the following technical scheme that：The preparation process of the ultra-fine guanidine nitrate of safe automobile air bag, including following step
Suddenly：1) guanidine nitrate raw material is subjected to preliminary mechanical crushing, obtains granularity less than the first powder of the guanidine nitrate of 200 mesh；2) by guanidine nitrate
First powder input high pressure fluidized bed jet mill crushes, and obtains guanidine nitrate level-one fine powder material；3) by 1-1.4% weight ratio to previous
Anti-caking agent is added in the guanidine nitrate fine powder material that step obtains, and is uniformly mixed；4) previous step is mixed with to the nitric acid of anti-caking agent
Guanidine fine powder material input disk-type jet mill is disperseed, and ultra-fine guanidine nitrate finished product is obtained.
The preparation process of the ultra-fine guanidine nitrate of above-mentioned safe automobile air bag, wherein again by guanidine nitrate level-one fine powder material first
Separating twice is carried out in secondary input high pressure fluidized bed jet mill, obtains guanidine nitrate two level fine powder material, then to guanidine nitrate two level fine powder
Material carries out the processing of next step.
The preparation process of the ultra-fine guanidine nitrate of above-mentioned safe automobile air bag, wherein flow through the air-flow of fluidized bed jet mill
Pressure control in 0.8-1.0Mpa, temperature control is at 2 DEG C hereinafter, FREQUENCY CONTROL flows through the gas of disk-type jet mill in 32-38Hz
The pressure control of stream is controlled in 0.4-0.5Mpa, temperature at 2 DEG C or less.
The preparation process of the ultra-fine guanidine nitrate of above-mentioned safe automobile air bag, wherein the chemistry of the guanidine nitrate raw material refers to
Mark requires：Purity >=98%, dissociate ammonium nitrate≤0.3%, moisture content≤0.1%, pH value 5.5-6.2, and water-insoluble≤
0.1%.
Above-mentioned anti-caking agent is superfine white carbon black, and volume and surface area ratio are 380m2/cm3, average particle size 0.8.
The preparation process of the ultra-fine guanidine nitrate of above-mentioned safe automobile air bag, wherein guanidine nitrate two level fine powder material and anti-caking
The incorporation time of agent is no less than five minutes, preferably seven minutes.
The invention has the advantages that the present invention overcomes for a long time, in the processing technology of ultra-fine guanidine nitrate, people
Think the prejudice that anti-caking agent must be added before crushing in guanidine nitrate raw material, creatively selected anti-caking agent addition opportunity,
The type of anti-caking agent and disintegrating apparatus appropriate, processing sequence and technological parameter enable the ultra-fine guanidine nitrate produced to reach
Required granularity requirements when to for automobile airbag inflation agent.
Specific embodiment
Specific embodiments of the present invention, for the production technology of the ultra-fine guanidine nitrate as automobile airbag inflation agent.It should
Production technology specifically includes following steps：
One, preliminary mechanical crushes.Selection guanidine nitrate raw material, chemical index requirement are：Purity >=98%, dissociate ammonium nitrate
≤ 0.3%, moisture content≤0.1%, pH value 5.5-6.2, water-insoluble≤0.1%, by guanidine nitrate raw material progress preliminary mechanical powder
It is broken, granularity is obtained less than the first powder of the guanidine nitrate of 200 mesh.Swing-beater pulverizer setting as mechanical crushing is used in the present embodiment
It is standby.
Two, the processing of level-one fine powder material.Powder input high pressure fluidized bed airflow milling at the beginning of the guanidine nitrate that previous step is obtained
It is broken, obtain guanidine nitrate level-one fine powder material.The basic principle of high pressure fluidized bed jet mill is to be accelerated into high pressure gas by nozzle
Ultrasonic air-flow injects head-on collision disintegrating area, makes fluidization of material, is accelerated under the action of high-speed flow, is handed in each nozzle
Mutual impact occurs at remittance and achievees the purpose that crushing.In this step, the air-flow pressure control of high pressure fluidized bed jet mill
In 0.8-1.0Mpa, temperature control 2 DEG C hereinafter, FREQUENCY CONTROL in 32-38Hz.
Three, the processing of two level fine powder material.The guanidine nitrate level-one fine powder material that previous step is obtained puts into high pressure fluidized bed airflow
Separating twice is carried out in mill, obtains guanidine nitrate two level fine powder material, air pressure, temperature and the frequency of the air-flow of high pressure fluidized bed jet mill
It is identical as previous step.
Four, it adds and mixes anti-caking agent.By the weight ratio of 0.4-0.9% anti-caking is added into guanidine nitrate two level fine powder material
Agent, and be uniformly mixed, selected anti-caking agent is superfine white carbon black, and volume and surface area ratio are 380m2/cm3, average particle size
It is 0.8, incorporation time is no less than five minutes.It, must since the volume ratio of the proportion and the two of anti-caking agent and material differs greatly
The palpus suitable mixing apparatus of careful selection, to ensure to be uniformly mixed.The shape of the mixing drum of the mixing apparatus used in the present embodiment
Shape be a square, shaft be located at the square on angle line.
Five, dispersion.The guanidine nitrate two level fine powder material input disk-type jet mill that previous step is mixed with to anti-caking agent is divided
It dissipates, so that the material dispersion of slight conglomeration is opened, and anti-caking agent and material is made further to be uniformly mixed, make guanidine nitrate two level fine powder material
The complete cladding of anti-caking agent is obtained, by the pressure control of the air-flow of disk-type jet mill in 0.4-0.5Mpa, temperature is controlled 2
DEG C or less.Since guanidine nitrate two level fine powder material particle and the volume of anti-caking agent particle are not much different, guanidine nitrate two level fine powder
Material is easy to get the complete cladding of anti-caking agent, can give full play to the effect of anti-caking agent.
The specific embodiment of the present invention is above are only, but the design concept of the present invention is not limited thereto, all utilizations
This design carries out the present invention change of unsubstantiality, should all belong to the behavior for invading the scope of the present invention.It is above-mentioned public to institute
The explanation for the embodiment opened, enables those skilled in the art to implement or use the present invention.To a variety of of above-described embodiment
Modification will be apparent to those skilled in the art, and the general principles defined herein can not take off
In the case of from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention is not intended to be limited to herein
Shown in above-described embodiment, and be to fit to widest range consistent with the principles and novel features disclosed in this article.
Claims (7)
1. a kind of safe automobile air bag preparation process of ultra-fine guanidine nitrate, which is characterized in that include the following steps：
Step 1: guanidine nitrate raw material is carried out preliminary crushing, granularity is obtained less than the first powder of the guanidine nitrate of 200 mesh；
Step 2: powder input high pressure fluidized bed jet mill at the beginning of guanidine nitrate is crushed, guanidine nitrate level-one fine powder material is obtained；
Step 3: adding anti-caking agent in the guanidine nitrate fine powder material obtained suddenly one step up by the mass percent of 1-1.4%, and mix
It closes uniformly, it is spare；
Disperseed to get to ultra-fine nitre Step 4: putting into disk-type jet mill into the guanidine nitrate fine powder material for be added to anti-caking agent
Sour guanidine finished product.
2. a kind of preparation process of the ultra-fine guanidine nitrate of safe automobile air bag according to claim 1, it is characterised in that：First
Guanidine nitrate level-one fine powder material is put into again and carries out separating twice in high pressure fluidized bed jet mill, obtains guanidine nitrate two level fine powder
Material, then the processing of next step is carried out to guanidine nitrate two level fine powder material.
3. a kind of preparation process of the ultra-fine guanidine nitrate of safe automobile air bag according to claim 1, it is characterised in that：Stream
The pressure control of air-flow through fluidized bed jet mill is in 0.8-1.0Mpa, and temperature control is at 2 DEG C hereinafter, FREQUENCY CONTROL is in 32-
38Hz flows through the pressure control of the air-flow of disk-type jet mill in 0.4-0.5Mpa, and temperature is controlled at 2 DEG C or less.
4. a kind of preparation process of the ultra-fine guanidine nitrate of safe automobile air bag according to claim 1, it is characterised in that：Institute
The chemical index requirement for stating guanidine nitrate raw material is：Purity >=98%, dissociate ammonium nitrate≤0.3%, moisture content≤0.1%, and pH value is
5.5-6.2, water-insoluble≤0.1%.
5. a kind of preparation process of the ultra-fine guanidine nitrate of safe automobile air bag according to claim 1, it is characterised in that：Institute
It is superfine white carbon black to state anti-caking agent, and volume and surface area ratio are 380m2/cm3, average particle size 0.8.
6. a kind of preparation process of the ultra-fine guanidine nitrate of safe automobile air bag according to claim 1, it is characterised in that：Nitre
Sour guanidine two level fine powder material and the incorporation time of anti-caking agent are no less than five minutes.
7. a kind of preparation process of the ultra-fine guanidine nitrate of safe automobile air bag according to claim 1, it is characterised in that：Nitre
Sour guanidine two level fine powder material and the incorporation time of anti-caking agent are seven minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810187699.5A CN108409514A (en) | 2018-03-07 | 2018-03-07 | A kind of preparation process of the ultra-fine guanidine nitrate of safe automobile air bag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810187699.5A CN108409514A (en) | 2018-03-07 | 2018-03-07 | A kind of preparation process of the ultra-fine guanidine nitrate of safe automobile air bag |
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| Publication Number | Publication Date |
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| CN108409514A true CN108409514A (en) | 2018-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810187699.5A Pending CN108409514A (en) | 2018-03-07 | 2018-03-07 | A kind of preparation process of the ultra-fine guanidine nitrate of safe automobile air bag |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1673204A (en) * | 2005-03-17 | 2005-09-28 | 戴良玉 | Prepn process of superfine guanidine nitrate specially for safe automobile air bag |
| CN1927779A (en) * | 2006-02-22 | 2007-03-14 | 上海东方久乐汽车安全气囊有限公司 | Gas generation medicine for automobile safety air bag gas generator and preparation process thereof |
| CN105294370A (en) * | 2015-05-22 | 2016-02-03 | 湖北汉伟新材料有限公司 | Superfine guanidine nitrate for gas generator and preparation technology of superfine guanidine nitrate |
-
2018
- 2018-03-07 CN CN201810187699.5A patent/CN108409514A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1673204A (en) * | 2005-03-17 | 2005-09-28 | 戴良玉 | Prepn process of superfine guanidine nitrate specially for safe automobile air bag |
| CN1927779A (en) * | 2006-02-22 | 2007-03-14 | 上海东方久乐汽车安全气囊有限公司 | Gas generation medicine for automobile safety air bag gas generator and preparation process thereof |
| CN105294370A (en) * | 2015-05-22 | 2016-02-03 | 湖北汉伟新材料有限公司 | Superfine guanidine nitrate for gas generator and preparation technology of superfine guanidine nitrate |
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Application publication date: 20180817 |
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