CN105136852A - Combustibility evaluation method of metal powder and solvent mixture thereof - Google Patents
Combustibility evaluation method of metal powder and solvent mixture thereof Download PDFInfo
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- CN105136852A CN105136852A CN201510579313.1A CN201510579313A CN105136852A CN 105136852 A CN105136852 A CN 105136852A CN 201510579313 A CN201510579313 A CN 201510579313A CN 105136852 A CN105136852 A CN 105136852A
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Abstract
The invention discloses a combustibility evaluation method of metal powder and a solvent mixture thereof. The method comprises the following steps: firstly, standing a mixture and observing whether the mixture has a solvent layer or not; if so, testing a closed cup flash point of the solvent layer; if a measured closed cup flash point value is more than 60 DEG C, determining that the mixture is a common chemical; if the measured closed cup flash point value is smaller than 60 DEG C, determining that the mixture is flammable liquid; secondly, combusting metal powder without the solvent layer; testing a solid combustion speed of the metal powder; if a measured combustion speed value is more than 2.2mm/s, determining that the metal powder is a flammable solid; then, measuring a closed cup flash point of a mixture with the measured combustion speed value smaller than 2.2mm/s; if the measured closed cup flash point value is more than 60 DEG C, determining that the mixture is the common chemical; finally, continuously combusting the mixture with the closed cup flash point value smaller than 60 DEG C and observing whether the mixture is continuously combusted or not; if so, determining that the mixture is the flammable solid; otherwise, determining that the mixture is the common chemical. The method disclosed by the invention has the advantages of reliable evaluation results and stable utilization conditions.
Description
Technical field
The present invention relates to a kind of assessment technology field of dangerous inflammable thing, be specifically related to the flammability appraisal procedure of a kind of metal powder and solvent mixture thereof.
Background technology
Metal powder and solvent mixture are conventional metallic pigments, as aluminum paste.Metal powder and solvent mixture because of solvent number, its state is variant, if solvent is higher, is then solvent with the metal powder of caking in being obviously separated, if solvent is lower, is paste or block.After the coated organic solvent of metal powder surface, dangerous reduction, eliminates the accident potential of metallic dust blast, but the organic solvent added, as kerosene, solvent wet goods have inflammability, therefore still exist and fire danger.
In the testing standard of current chemicals/goods both at home and abroad, first carry out state and differentiate to determine solid or liquid, then according to state determination flammability method of testing, chemical solid is by the judgement of combustion rate, and liquid chemical is judged by close cup flash point.State differentiates Main Basis fusing point, steam pressure, is then judged by viscosity for thick solid.According to the regulation of " global chemicals homogeneous classification labeling system " (hereinafter referred to as GHS), liquid refers to that steam pressure is no more than 300kPa 50 DEG C time, is not exclusively gas and fusing point or melting point onset are 20 DEG C or lower material or potpourri under standard pressure under 20 DEG C and normal pressure 101.3kPa; For stickum or potpourri, the test of ASTMD4359-2012 should be carried out, or carry out the test (penetrameter test) that " European international road transportation of dangerous goods agreement " annex A 2.3.4 saves the mobility of regulation; The singularity that metal powder and solvent mixture form due to it, cannot carry out state and differentiate correlation parameter test.Therefore, the flammability for this kind of speciality chemical of potpourri of metal powder and organic solvent judges to there is no clear and definite method at present.
Summary of the invention
The object of the present invention is to provide the flammability appraisal procedure of a kind of metal powder and solvent mixture thereof, the method, for evaluating the flammability of the potpourri of metal powder and organic solvent formation, has the advantage that evaluation result is reliable, service condition is stable.
Its technical solution comprises:
A flammability appraisal procedure for metal powder and solvent mixture thereof, described method comprises the following steps successively:
A, get the potpourri of appropriate metal powder and solvent thereof, by its sealing and standing a period of time, observe whether separative solvent layer, if there is solvent layer, then test the close cup flash point of this solvent layer, if the close cup flash point value recorded is greater than 60 DEG C, be then classified as common chemicals, if the close cup flash point value recorded is less than 60 DEG C, be then classified as flammable liquid; If solvent-free layer after leaving standstill, then enter next step process;
B, by the metal powder of step a solvent-free layer burn, test its solid combustion speed, if the combustion rate value recorded is greater than 2.2 mm/second, be then classified as inflammable solid; If the combustion rate value recorded is less than 2.2 mm/second, then enter next step process;
C, testing procedure b combustion rate value are less than the close cup flash point of the solvent-free metal powder mixture of 2.2 mm/second, if the close cup flash point value recorded is greater than 60 DEG C, are then classified as common chemicals; If the close cup flash point value recorded is less than 60 DEG C, then enter next step process;
In the sustained combustion of 60 DEG C of potpourris under d, testing procedure c close cup flash point value, observe its whether sustained combustion, if sustained combustion, be then classified as inflammable solid; Otherwise, then common chemicals is classified as.
As a preferred version of the present invention, described metal powder is metallic pigments.
As another preferred version of the present invention, in step a, sealing and standing 24h.
The Advantageous Effects that the present invention brings:
Compared with prior art, the invention provides the flammability appraisal procedure of a kind of metal powder especially metallic pigments and its solvent mixture, the method is by testing the close cup flash point of potpourri, solid combustion rate test, sustained combustion is tested, judge whether potpourri is flammable liquid, common chemicals or inflammable solid, by continuous print fabrication evaluation, can the security of accurate evaluation metallic pigments and its solvent mixture, the present invention carries out accurate analysis test to mixture state, eliminate the accident potential of potpourri blast, enterprise securityization is produced and has certain directive significance.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described:
Fig. 1 is the process chart of flammability appraisal procedure of the present invention.
Embodiment
The invention discloses the flammability appraisal procedure of a kind of metal powder and ORGANIC SOLVENT MIXTURES thereof, in order to make advantage of the present invention, technical scheme clearly, clearly, below in conjunction with specific embodiment, the present invention being elaborated.
Shown in composition graphs 1, the flammability appraisal procedure of metal powder of the present invention and its ORGANIC SOLVENT MIXTURES, specifically comprises the following steps:
(1) first determine whether potpourri has the organic solvent of flowing, if there is the organic solvent of flowing, test its close cup flash point, flash-point is less than 60 DEG C, be then flammable liquid; If there is no the organic solvent flowed, need the test carrying out step (2);
(2) according to " test and manual of standards ", the method for testing of solid combustibility is tested, if combustion rate is greater than 2.2 mm/second, then be considered as inflammable solid, if combustion rate is less than 2.2 mm/second, then should carry out close cup flash point test, if close cup flash point is greater than 60 DEG C, then not be divided into inflammable solid, if close cup flash point is less than 60 DEG C, then need the test carrying out step (3);
(3) according to " test and manual of standards " for liquid continuous combustible test, if can sustained combustion, then should be considered as inflammable solid, if not sustained combustion, be then common chemicals.
The concrete steps of above-mentioned involved solid combustion rate test, close cup flash point, sustained combustion test are as follows:
The first, state is differentiated
Observe whether have flowable liquids after metal powder and ORGANIC SOLVENT MIXTURES thereof are left standstill 24 hours, if there is flowable liquids, then test close cup flash point; Otherwise, then test solid combustion speed, and determine whether to test solid flash-point and sustained combustion further according to flammability.
The second, close cup flash point test
Due to metal powder and ORGANIC SOLVENT MIXTURES, following methods can be adopted to determine its close cup flash point:
ISO1516, " flashing test closed-cup balancing method ";
ASTMD93, " measuring the standard test method of flash-point with Pensky-Martens closed tester ".
Three, solid combustion rate test
1, equipment and material
Use a long 250mm, leg-of-mutton mould that section is interior high 10mm and wide 20mm to be to make the powder band of combustion rate test.Two panels sheet metal is installed in longitudinal both sides of mould, and as the limiting plate of side, plate exceeds 2mm than the top of triangular cross-section.Use impermeable, do not burn, the flat board of low heat conduction to be to put sample powder band.
2, test procedure
Potpourri to be tested is made continuous print band, about long 250mm, wide 20mm, high 10mm, be placed on the base plate of cold impermeable, low heat conduction, the thermal-flame (minimum temperature is 1000 DEG C) sprayed with jet for gas (minimum diameter is 5mm) burns one end of sample belt, until light, or torch firing maximum duration is 2 minutes.Should notice whether burning spreads 200mm along powder band in 2 minutes test periods.Within 2 minutes, light in test period if do not occurred in and propagate 200mm with flame or the form of smoldering, so this material should not divide inflammable solid into, and not test further.If have propagated 200mm in less than 2 minutes, then combustion rate test should be carried out.
When sample belt has burnt the distance of 80mm, the burning rate of 100mm after measuring.Test should carry out six times, all uses clean buck at every turn, unless observed the result of affirmative more early time.
3, the method for testing standard and evaluation result
As described in the test carried out of test method in once or the score of firings time be greater than 2.2mm/s less than 45 seconds or combustion rate, should inflammable solid be divided into.
Four, sustained combustion test
1, equipment and material
Sustained combustion tester: the antirust metal comprising one block of aluminium alloy or use other temperature conductivitys high, derby has a groove and thermometer is housed, a fixing small-sized jet for gas is on the rotary shaft contained on derby, and the handle of jet for gas can become any angle easily with air intake opening with jet for gas.
Need following devices:
A () gauge is 2.2 millimeters for checking the height at jet for gas centre distance sample groove top,
(b) thermometer, mercury is contained in glass, and for traverse, sensitivity is not less than 1 millimeter/DEG C, or there is same sensitivity, scale interval is the measurement mechanism of 0.5 DEG C.When thermometer is placed in derby, the thermoplastic compound of mercury bulb application heat conduction wraps;
C () electric furnace, is equipped with temperature control equipment (other devices with proper temperature opertaing device can be used to carry out heatable metal block);
(d) stopwatch, or other suitable time sets;
E () syringe, can inject 2 milliliters, degree of accuracy ± 0.1 milliliter;
(f) fuel, butane.
2, test procedure
(1) equipment should be arranged on complete stuffy district 1, and the high light that do not have is beneficial to Observation Flash, flame etc.;
(2) derby to be placed on electric furnace or to maintain in set point of temperature ± 1 DEG C by the temperature that derby to be heated to the thermometer display be placed in derby by other appropriate device.Test temperature is 60.5 DEG C or 75 DEG C.Pressure as barometer display is different from normal atmospheric pressure (101.3 kPas), should Adjustment Tests temperature as follows: pressure often high or low 4 kPas to heighten by test temperature or to turn down 1.0 DEG C, heighten when pressure is higher, turn down when pressure is lower.Guarantee derby top completely in level.Gauge is used to check when testing position gasburner at sample groove placed on top 2.2 millimeters place;
(3) butane is lighted when jet for gas leaves testing position (i.e. the position of "Off", leaves sample groove).The size of adjustment flame makes it have 8 millimeters to 9 millimeters high and about 5 mm wides;
(4) use syringe to extract the sample of at least 2 milliliters from sampling receptacle, rapidly by the sample groove of the sample shift-in flammability test instrument of 2 milliliters ± 0.1 milliliter, and start timer at once;
(5) reach 60 seconds after (sample is considered to reach the time of its equilibrium temperature) in the heat time, if test(ing) liquid is not lighted, forward test flame to testing position at liquid tank overlie.Make flame remain on this position 15 second, then it is gone back to the position of "Off", observe the dynamic of sample simultaneously.Test flame should be lighted in whole process of the test always.
(6) test should carry out three times, and each test should be observed and record:
A (), before test flame moves on to testing position, whether sample is lighted and sustained combustion, or flashing, or does not both have;
Whether (b) test flame sample when testing position is lighted, and if so, how long did it last to get back to the position after-combustion of "Off" at test flame;
(7) if do not observe the sustained combustion according to explaining in (9), so repeat whole program with new sample, but the heat time changes 30 seconds into;
(8) if do not observe the sustained combustion according to explaining in (9) at test temperature 60.5 DEG C, so at test temperature 75 DEG C, whole program is repeated with new sample;
(9) method of testing standard and assessment result
Material should be decided to be not sustained combustion or sustained combustion, if a kind of situation should say it is sustained combustion below the generation of any one sample in two heat times or two test temperatures:
A () test flame is when the position of "Off", sample is lighted and sustained combustion;
(b) test flame when testing position stopped for 15 second, sample light and test flame get back to the position of "Off" after sustained combustion more than 15 seconds.The flashing of interval should not be construed as sustained combustion.Usually 15 seconds then, burning or significantly stop or continue.
It should be noted that, under the instruction of this instructions, those skilled in the art can also make such or such easy variation pattern, such as equivalent way, or obvious mode of texturing, all should within protection scope of the present invention.
Claims (3)
1. a flammability appraisal procedure for metal powder and solvent mixture thereof, is characterized in that: described method comprises the following steps successively:
A, get the potpourri of appropriate metal powder and organic solvent thereof, by its sealing and standing a period of time, observe whether separative solvent layer, if have solvent layer after leaving standstill, then test the close cup flash point of this solvent layer, if the close cup flash point value recorded is greater than 60 DEG C, be then classified as common chemicals, if the close cup flash point value recorded is less than 60 DEG C, be then classified as flammable liquid; If solvent-free layer after leaving standstill, then enter next step process;
B, by the metal powder of step a solvent-free layer burn, test its solid combustion speed, if the combustion rate value recorded is greater than 2.2 mm/second, be then classified as inflammable solid; If the combustion rate value recorded is less than 2.2 mm/second, then enter next step process;
C, testing procedure b combustion rate value are less than the close cup flash point of the solvent-free metal powder mixture of 2.2 mm/second, if the close cup flash point value recorded is greater than 60 DEG C, are then classified as common chemicals; If the close cup flash point value recorded is less than 60 DEG C, then enter next step process;
In the sustained combustion of 60 DEG C of potpourris under d, testing procedure c close cup flash point value, observe its whether sustained combustion, if sustained combustion, be then classified as inflammable solid; Otherwise, then common chemicals is classified as.
2. the flammability appraisal procedure of metal powder according to claim 1 and solvent mixture thereof, is characterized in that: described metal powder is metallic pigments.
3. the flammability appraisal procedure of metal powder according to claim 1 and solvent mixture thereof, is characterized in that: in step a, sealing and standing 24h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510579313.1A CN105136852A (en) | 2015-09-11 | 2015-09-11 | Combustibility evaluation method of metal powder and solvent mixture thereof |
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| CN201510579313.1A CN105136852A (en) | 2015-09-11 | 2015-09-11 | Combustibility evaluation method of metal powder and solvent mixture thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106526067A (en) * | 2016-11-08 | 2017-03-22 | 广西出入境检验检疫局危险品检测技术中心 | Scaleplate used for testing burning rate of solid hazardous article |
| CN107315031A (en) * | 2016-06-12 | 2017-11-03 | 国家安全生产监督管理总局化学品登记中心 | Solid matter flammability hazard discrimination method |
| CN114414625A (en) * | 2022-01-25 | 2022-04-29 | 东北大学 | Testing device and method for evaluating influence of moisture content on dust bed fire |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107315031A (en) * | 2016-06-12 | 2017-11-03 | 国家安全生产监督管理总局化学品登记中心 | Solid matter flammability hazard discrimination method |
| CN106526067A (en) * | 2016-11-08 | 2017-03-22 | 广西出入境检验检疫局危险品检测技术中心 | Scaleplate used for testing burning rate of solid hazardous article |
| CN106526067B (en) * | 2016-11-08 | 2018-08-17 | 广西出入境检验检疫局危险品检测技术中心 | A kind of scale for the experiment of dangerous goods in solid form burn rate |
| CN114414625A (en) * | 2022-01-25 | 2022-04-29 | 东北大学 | Testing device and method for evaluating influence of moisture content on dust bed fire |
| CN114414625B (en) * | 2022-01-25 | 2023-10-31 | 东北大学 | Testing device and method for evaluating influence of moisture content on dust layer fire disaster |
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