Oxygen index detection method and device

A measuring device and oxygen index technology, which is applied in chemical analysis by means of combustion, etc., can solve the problems of increased difficulty and cost of flame retardant materials, and inability to measure directly, and achieve the effect of scientific test method, rich data and simple structure

Inactive Publication Date: 2014-07-16
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In conventional flame retardant performance testers, such as oxygen index meter, horizontal burning meter and vertical burning meter, the test samples have specific shapes, such as sheet, film, fabric, etc. However, there is no such thing as powder, liquid, etc. For materials with a fixed form, the existing equipment cannot be directly measured, and the material needs to be processed to make a sample to be tested, which undoubtedly increases the difficulty and cost of developing and researching new flame-retardant materials.

Method used

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  • Oxygen index detection method and device

Examples

Experimental program
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Embodiment 1

[0025] See attached figure 1 , which is a schematic structural diagram of an oxygen index measuring device provided in this embodiment. The oxygen index measuring device is composed of a nitrogen measuring and controlling device, an oxygen measuring and controlling device, a nitrogen and oxygen mixing device, a propane igniter, a burner and a sample temperature and time measuring device. Wherein, the burner adopts the same material as the glass chimney of the existing oxygen index instrument, and the main material can be stainless steel, ceramics, glass containers, etc. The structure of the burner: the heat-resistant glass chimney burner is a cylindrical composite structure, which is divided into a lower cylinder 1 and an upper cylinder 3. The upper and lower parts are connected by the transition zone cylinder 2. The sample pool 4 is fixed by the bracket 5 and placed in the transition zone. In the middle of the cylinder body 2, glass beads 6 are placed at the bottom of the lo...

Embodiment 2

[0034] According to the technical scheme of Example 1, this example measures the oxygen index of the flame-retardant powder polypropylene powder containing 20% ​​of the classic flame-retardant expansion system (ammonium polyphosphate: melamine: pentaerythritol mass ratio = 2:1:1), which See the attached Figure 5 .

[0035] Figure 5 The relationship between combustion temperature and time of powder polypropylene containing 20% ​​classical flame retardant intumescent system is given when the ignition time is 30s. It can be seen from the figure that when the oxygen content is 41.0%, the combustion temperature on the back of the flame-retardant powdered polypropylene has a maximum value, and at 3 minutes after ignition, the slope of the temperature-time curve is basically 0, which can be obtained with 20% of the classic flame-retardant The POI of the powdered polypropylene of the expansion system is 41.0%.

Embodiment 3

[0037]According to the technical scheme of Example 1, this example measures the oxygen index of the flame-retardant treated powder polypropylene powder containing 40% of the classical expansion system, and the results are shown in the attached Figure 6 .

[0038] Figure 6 The relationship between combustion temperature and time (ignition time 30s) of powdered polypropylene containing 40% classical flame retardant intumescent system is shown. It can be seen from the figure that when the oxygen content is 57.4%, the combustion temperature of the flame-retardant powdered polypropylene has the maximum value, and the POI of the powdered polypropylene containing 40% of the classic flame-retardant intumescent system is about 57.4%.

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Abstract

The invention discloses an oxygen index detection method and device. The detection method comprises an oxygen and nitrogen inputting and measuring device and a combustor, and is characterized by further comprising a temperature sensor and a temperature-time recording device, wherein the combustor is in a cylindrical combined structure and is divided into a lower cylinder, a transition area cylinder and an upper cylinder; the inner diameter of the lower cylinder is 110-120 mm and the inner diameter of the upper cylinder is 100-110 mm; the inner diameter of the transition area cylinder is gradually changed so that the transition area cylinder is connected with the upper cylinder and the lower cylinder in a transitional manner; a sample tank is fixedly arranged at the center of the transition area cylinder by a bracket; the temperature sensor is placed at the bottom of the outer wall of the sample tank; and an output end of the temperature sensor is connected with the temperature-time recording device. An oxygen index is detected by obtaining a combustion temperature-time relation curve. By the oxygen index detection method and device, disclosed by the invention, a sample to be detected without a fixed shape is conveniently detected and bases are supplied for researching and developing a new material.

Description

technical field [0001] The invention relates to a method for measuring the flame retardancy of a material, in particular to a method for measuring the oxygen index of a material and a device thereof, which is suitable for measuring the flame retardancy of liquid, powder and intumescent flame retardant system materials. Background technique [0002] Oxygen index refers to the minimum oxygen concentration required to maintain stable combustion of a sample in a mixed flow of oxygen and nitrogen under specified conditions, expressed in volume percent of oxygen. A high oxygen index indicates that the material is not easy to burn, and a low oxygen index indicates that the material is easy to burn. It is generally believed that the oxygen index < 22 belongs to flammable materials, the oxygen index between 22 and 27 belongs to combustible materials, and the oxygen index > 27 belongs to flammable materials. [0003] When evaluating the relative flammability of plastics and othe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/12
Inventor 石小丽吴雪云赵云莫晓杰朱新生范丽娟
Owner SUZHOU UNIV
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