CN1084204A

CN1084204A - Dry powder compresed gas aerosol

Info

Publication number: CN1084204A
Application number: CN 93101567
Authority: CN
Inventors: M·J·瑞诺兹
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-09-07
Filing date: 1993-02-25
Publication date: 1994-03-23
Also published as: AU2620092A; GB2270322B; AU632264B2; GB9302539D0; GB2270322A

Abstract

A kind of dry powder aerosol product, it comprises:

One comprises valve and injector device, also comprises the aerosol canister of intubate when needing; Be in a certain amount of dry hydrophobic powder in this aerosol canister; And a kind of pressure is at least the rare gas element of 620kPag (20 ℃).

Description

Dry powder compresed gas aerosol

The present invention relates to the dry powder compresed gas aerosol product and relate to the method and apparatus that is used to make this product, particularly relate to fire extinguishing aerosol product but be not limited to this product.

For many years people just wish to have a kind of organic propellant that do not use, to human body nontoxicity and not environmentally hazardous dry powder aerosol product.Yet this hope still fails to realize so far.Although it is believed that the dry powder aerosol product that the rare gas element of utilization compression sprays is the ideal product, but still fail to produce a kind of dry powder aerosol product so far, and also fail to work out a kind of method and apparatus that is used to produce such product with characteristics such as gratifying preparation effect, product stability, storage life and jet particle fineness.

United States Patent(USP) Nos. 3,055,435(Warnock), 2,065,818(Carter) and 2,819,763(Boal) relate to the powder type fire extinguisher (being different from canned aerosol product) that uses pressurized gas (for example nitrogen, carbonic acid gas or air) and some to use ethane that the chemical of doing is ejected surprisingly from flash arrestor.These patents have been described especially and have been used a kind of valvegear and use sorbent material promote the to put out a fire ejection of chemical.There is not a patent to mention these problems of producing a kind of can type aerosol dry-chemical fire extinguishing product.U.S. Patent No. 2,785,838(Mayer) a kind of pot type dry powder aerosol flash arrestor has been proposed, and a problem relevant with this device proposed, this device is that the end in intubate is provided with a valve plug, when the content in the valvegear on the needs manipulation jar allows jar sprays, make valve plug open intubate so that allow powder flow out.This patent is mentioned liquefied gas products such as for example using Refrigerant 12 especially rather than is used such as compression gases such as nitrogen, and mention especially and how to solve the powder gas injection agent that is liquefied and soak and form the problem of agglomerate, because this agglomerate can stop up the nozzle of valvegear and aerosol canister fully, therefore it can not be operated effectively.

" Principles of Aerosol Technology ", Paul A.Sanders, 1990, Van Nostrand Reinhold Company PP28-33,60-62,88-90 and 161-163; " The Science and Technology of Aerosol Packaging ", John S.Sciarra and Leouard Stoller, 1974, John Wiley ﹠amp; Sons, PP136-141; And " Kirk Othmer Encyclopaedia of Chemical Techmology ", Vol.1, PP670-685; All these documents have all been narrated why in generation nineteen fifty and generation nineteen sixty, nitrogen is subjected to warm welcome so as the potential use meeting that is used for the pressurized gas propellant of aerosol canister, and this is because nitrogen has inexpensive, hypotoxicity, inertia and stable advantage.Yet nitrogen still is rejected use basically, this mainly be because, when pressurized gas only is charged under 690kPag(20 ℃) pressure the time, be difficult to all powder-products are ejected.When running into unforeseen circumstances jar is inverted so that its when spraying, the gas of compression only can be ejected into to a certain degree, remaining gas is not enough to all powder-products are gushed out.Therefore pressurized gas use has in every respect all been abandoned basically.

Although require consumingly promptly to reduce those global emissions that cause the gas of Greenhouse effect and the gas that damages the ozone layer (liquefied gas that for example comprises hydro carbons, halocarbon class or halogenated hydrocarbon) but still dissatisfied known or available dry powder compresed gas aerosol product might be used to wide wide field and can powder-product be sprayed onto distance far away with a kind of acceptable spray regime people in recent years.

Therefore an object of the present invention is to provide and a kind ofly can be used for the pressurized gas dry powder aerosol product of wide wide-range (comprising fire extinguishing) and a kind of method and apparatus that is used to make this product is provided.

Therefore an aspect of of the present present invention has provided a kind of method that is used to make the dry powder aerosol product, and this method comprises:

The dried hydrophobic powder of aequum is packed in the aerosol canister;

With a valve and injector device, when needs, also have intubate, be installed on the jar, the mode of installation is that valve is not contacted with dry powder with injector device, and the intubate of injector device does not stretch in the dry powder.

With jar reversing with the opening end that guarantees intubate adhering powder not; And

With rare gas element jar is pressurized to 620kPag(20 ℃ at least at the inflation platform).

On the other hand, the present invention also provides a kind of dry powder aerosol product, and this product comprises:

An aerosol canister, it comprises a valve and injector device, also comprises an intubate when needs;

Be placed on a certain amount of dry drainage powder in the aerosol canister; And

A kind of pressure is at least 620kPag(20 ℃) the rare gas element propellant.

Preferably dry powder contains phosphoric acid ammonia ammonium, and this gas is nitrogen.Preferred pressure is to be at least 690kPag and most preferred pressure is 840-1000kPag(20 ℃).Preferably used jar is that a kind of nominal volume is 550,670 or 1, jar of 400ml, that the dry powder amount in the jar then correspondingly is respectively is about 300,370-420(is preferably 400) or 1,000g.Nominal volume for 670ml, the gas weight of introducing is preferably about 5.0-5.6g, be preferably 5.3g, then correspondingly regulate the weight of introducing gas for other volumetrical jars, for example should be 4.1-4.6 mutually, be preferably 4.35g(to the 550ml nominal volume), and 10.4-11.7, be preferably 11.1g(to the 1400ml nominal volume).

Be preferably in the gas passage that opens and closes between air-flow jar of elder generation's cut-out before and the inflation platform, to guarantee causing that owing to closed gas flow pressure makes the valvegear on the jar be in closing condition before descending, so just can prevent in fact that any dry powder from entering the intubate of valvegear and obstruction that may therefore cause and gas flow and product mobile interruption in course of injection afterwards.

The Australian standards AS2278-1986 that Standards Association of Australia (Standards Associatoin of Australia) is formulated the metal aerosol container is consistent with following minimal deformation pressure criteria:

1. low pressure vessel (the tinplate container that weld seam is arranged) must be able to bear 970kPag(55 ℃) pressure;

2. medium pressure vessel (whole aluminum container) must be able to bear 1100kPag(55 ℃) pressure;

3. high pressure vessel must be able to bear 1265kPag(55 ℃) pressure; , this standard is applicable to that internal diameter is less than or equal to 75mm, nominal (being full of) volume is less than or equal to the container of 820ml.

Above-mentioned preferred approach is based on those aerosol canisters that meet the minimum Australian standards of low-voltage and medium voltage container and sets up.Be appreciated that nitrogen gas pressure just can correspondingly improve so if used jar can bear the minimum sandards pressure that surpasses corresponding to minimal deformation.For example, if low pressure jar can bear the pressure of 1150kPag and not deform, nitrogen gas pressure just can be brought up to 1000kPag(20 ℃ so), this pressure is more much bigger than the pressure of prior art suggestion.

Above-mentioned inflation pressure is determined according to the Pressure/Temperature relation table of following pressurized gas (comprising nitrogen).

Temperature (℃) pressure (kPag) approximation

10 500 960

20 521 1000

30 542 1040

40 564 1080

50 585 1120

55 596 1140

Be readily appreciated that method and apparatus of the present invention is applicable to that it is the suitable powder carrier that adds the required given activity composition of carrier band that the dry powder compresed gas aerosol of very wide scope product, method are provided.

Describe preferable embodiment of the present invention below with reference to accompanying drawing, this accompanying drawing represents to implement the vertical view of the equipment of the inventive method.

Aerosol canister (valve and injector are not installed as yet) is placed on the unserambler 10 and is transferred to product charging deck 11, here, from product reservoir 12 a kind of ammonium hydrogen phosphate with finely powdered of packing into to this jar is the product F UREX710 of main component, the about 400g of loading capacity.Again jar is transferred to valve and injector erecting bed 13, here valve and jet apparatus are inserted in the jar according to having a certain degree with jar shape, be that the intubate of valve and the molectron of injector do not adhere to product for when the assembly with valve and injector inserts in the jar and is fixed on the jar like this.Then jar is transferred to inflation platform 14, here toward jar in to fill nitrogen to pressure be 840kPag, jar should keep being at least with vertical line formation 45 ° angle during inflation.Then jar is sent to valve button (Valve button) erecting bed 15, then is sent to add a cover platform 16 and be sent at last and deposits platform 17.Before inflation and afterwards, weigh at platform 18 and 19 places respectively, charge in the jar whether to check gas with aequum.

Also can be provided with the other platform of weighing check add the weight of powder.Following table provides a collection of 24 canned test situation that fire retardant matter and nitrogen are arranged.

Table

A slack tank heavy (g)

B jar and product heavy (g)

Jar heavy (g) after C closes

Jar heavy (g) after the D inflation

The jar heavy (starter and lid have been installed) that E is last

Slack tank changes in weight scope 100.8-102.2=1.4g

Gas weight variation range (D-C) 5.2-5.4g

Powder weight changes (B-A) 379.6-385.6g, average range 6g

The average gross weight 10.6-10.8g of starter and lid

A kind of particularly preferred fire retardant material is by Chemishe Produkte Weinstock ﹠amp; Siebert(Dusseldorf, Germany) FUREX710 that produces, this is a kind ofly to be base-material with the ammonium hydrogen phosphate and to be added with for example fire extinguishing powder of stablizer, hydrophobicity toughener and anti-caking agent of additive.

Be readily appreciated that method of the present invention can be used for various hydrophobic powder aerosol products, and the invention is not restricted to the dry-chemical fire extinguishing aerosol product.Be readily understood that, what dry powder aerosol product of the present invention can be with any finely powdered, hydrophobic, can make by free-pouring powder.

Claims

1, a kind of method of making the dry powder aerosol product, this method comprises:

The dry hydrophobic powder of aequum is packed in the aerosol canister;

With a valve and injector device, when needs, also comprise intubate, be installed on the jar, will make valve not contact during installation, and the intubate of injector device is not inserted in the powder with powder with injector device;

Tilt this jar with the opening end that guarantees said intubate adhering powder not; And

Jar is pressurized to the pressure that is at least 620kPag (20 ℃) at the inflation platform with rare gas element.

2, method as claimed in claim 1, wherein said powder packets phosphoric acid hydrogen ammonium.

3, as the method for claim 1 or 2, wherein said gas is nitrogen.

4, as claim 1,2 or 3 method, wherein said pressure is at least 690kPag.

5, method as claimed in claim 4, wherein said pressure is 840-1000kPag(20 ℃).

6, method as claimed in claim 5, wherein said jar is that a kind of nominal volume is 550,670 or 1, the jar of 400ml, the dry powder amount in jar then is respectively 300,370-420(is preferably 400) or 1000g.

7, method as claimed in claim 6, the wherein said weight that charges into gas is the jar of 550ml for nominal volume, is approximately 4.1-4.6g, is preferably 4.35g; Jar for 670ml is approximately 5.0-5.6g, is preferably 5.3g; For 1, the jar of 400ml is approximately 10.4-11.7g, is preferably 11.1g.

8, method as claimed in claim 7, wherein, to guarantee causing that owing to the closed gas flow valvegear on the jar has been in closing condition before the remarkable decline of pressure, enter the intubate and the obstruction and the interruption of gas stream and product flow in course of injection afterwards that therefore cause of valvegear in the gas passage between elder generation's cut-out jar before the closed gas flow and the inflation platform in fact to prevent any dry powder.

9, a kind of dry powder aerosol product, it comprises:

Be in a certain amount of dry hydrophobic powder in the aerosol canister; And a kind of at 620kPag(20 ℃ at least) rare gas element propellant under the pressure.

10, product as claimed in claim 9, wherein said powder packets phosphoric acid hydrogen ammonium, and said gas is nitrogen.

11, as the product of claim 9 or 10, wherein said pressure is 690kPag(20 ℃ at least), and most preferably be 840-1000kPag(20 ℃).

12, as claim 9,10 or 11 product, wherein said jar is that a kind of nominal volume is 550,670 or 1, jar of 400ml, the amount of powder in the jar then is respectively 300g, 370-420(is preferably 400) g, or 1,000g.

13, as the product of claim 12, the wherein said weight that charges into gas, the jar for the 550ml nominal volume is approximately 4.1-4.6g, is preferably 4.35g; Jar for the 670ml nominal volume is approximately 5.0-5.6g, is preferably 5.3g; For 1, the jar of 400ml nominal volume is approximately 10.4-11.7g, is preferably 11.1g.