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Flash point standard substance

A standard substance, flash point technology, applied in the field of metrology, can solve problems such as poor stability, low flash point value, and large limitations

Inactive Publication Date: 2012-07-11
JIANGSU INST OF METROLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Mineral oil: It is a mixture, its flash point value is related to the viscosity, it has high requirements for preservation and poor stability
[0007] Pure substances: fixed flash point values, but more limited
For example, for the pure substance p-xylene, its open flash point and closed flash point are 29°C and 25°C respectively, which is too low to be used as a standard
And some pure substances with high flash point, such as glycerol (glycerin) with an open flash point of 177°C, have poor stability due to their strong hygroscopicity, while hexadecane has a closed flash point of 134°C, but when heated Has a strong irritating smell, because the fume hood cannot be opened during the flash point test, so it is not suitable
[0008] It can be seen that the currently used flash point reference materials have their own limitations, so it is necessary to develop a new flash point reference material for evaluating the performance of the flash point tester.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1 Uncertainty test

[0015] The uncertainty component of the flash point reference material mainly includes the following several influencing factors: (1) cooperative value determination; (2) moisture in methyl silicone oil; (3) uncertainty introduced by the linearity of the instrument; (4) standard Material homogeneity; (5) Standard material stability;

[0016] Inspection object:

[0017] Four kinds of simethicone oils with different degrees of polymerization were selected, marked as 1#, 2#, 3#, 4# respectively, and their viscosity numbers were 10, 20, 35, 40# respectively, and their dynamic viscosity values ​​were about 10.3 , 22.6, 37.8, 42.4 (mpa·s), each package is packaged in multiple brown bottles, and its open flash point and closed flash point are tested respectively.

[0018] Open flash point standard substance (4 temperature points, marked as 1#, 2#, 3#, 4#)

[0019] Closed flash point standard substance (4 temperature points, marked as 1#, 2#, ...

Embodiment 2

[0099] Embodiment 2 homogeneity, stability test

[0100] Inspection object:

[0101] Four kinds of simethicone oils with different degrees of polymerization were selected, marked as 1#, 2#, 3#, 4# respectively, and their viscosity numbers were 10, 20, 35, 40# respectively, and their dynamic viscosity values ​​were about 10.3 , 22.6, 37.8, 42.4 (mpa·s), each package is packaged in multiple brown bottles, and its open flash point and closed flash point values ​​are tested respectively to check the uniformity and stability.

[0102] 1. Uniformity test

[0103] Homogeneity refers to the state in which one or several properties of a substance have the same components or the same structure. According to the principle of similar compatibility, oil substances are miscible and can still maintain their homogeneity after mutual dissolution. During the development and test, it is planned to select different types of simethicone for modulation. When configuring, mix them according to a ...

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Abstract

The invention provides a flash point standard substance, which is dimethyl silicon oil with a structure as shown in a formula I, wherein the purity of the dimethyl silicon oil is 100%, and the viscosity is not more than 50mm<2> / s. The flash point standard substance is a siloxane polymer; according to different polymerization degrees, flash point values are also different; and the viscosities are different in a range of 5-500,000mm2 / s. The flash point standard substance has the advantages of physiological inertness, good chemical stability, electric insulativity and weather resistance, wide viscosity range, low freezing point, high flash point, good hydrophobicity and high shearing resistance.

Description

technical field [0001] The invention relates to a flash point standard substance used for judging the performance of a flash point tester, belonging to the technical field of measurement. Background technique [0002] Under the specified test conditions, when the liquid substance rises to a certain temperature, the mixture of vapor and air above its surface will flash when it comes into contact with the flame, and the corresponding temperature is read at this time, which is the flash point of the substance. The minimum temperature at which the mixture of steam and air released from heating the oil product under specified conditions with an open flash point tester and the flame will flash instantly is called the open flash point. The lowest temperature at which the mixture of steam and air released from heating the oil product under specified conditions will flash instantly when it comes into contact with the flame with a closed flash point tester is called the closed flash p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/52
Inventor 蔡冶强马宇明毛朔南邢金京姚绍卫蒋孝雄
Owner JIANGSU INST OF METROLOGY
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