Test device for oxidation induction time and carbon black content of electric wire and cable sheath material

Abstract

The invention belongs to the technical field of inspection for electric wire and cable materials, and relates to a test device for the oxidation induction time and carbon black content of an electric wire and cable sheath material. The test device comprises a tubular device, an annular heating device, a quartz tube, a first solenoid valve, a second solenoid valve, a bearing body, a supporting body, a thermocouple assembly, a test instrument, a combustion boat and a cork, wherein connection holes are formed in the cork, and the cork is plugged in a cavity in one end of the quartz tube; a channel capable of accommodating the quartz tube is formed in the tubular device, and the quartz tube is not in contact with the tubular device in an installation state; the heating device is distributed in the tubular device; and the output opening of the first solenoid valve is connected in one connection hole of the cork, and the output opening of the second solenoid valve is connected in a cavity in the other end of the quartz tube. The invention further discloses a test method. The test device and the test method disclosed by the invention have the main beneficial effects that the test device is simple in structure, easy to produce, low in cost, and accurate and reliable in test data; and the test method is simple, easy to grasp and low in production cost.

Description

technical field [0001] The invention belongs to the technical field of wire and cable material inspection, and in particular relates to a testing device for the oxidation induction period and carbon black content of wire and cable sheath materials. Background technique [0002] Air and sunlight are essential to human survival and plant growth on the earth, but they have a bad destructive effect on the use of polyolefin materials. Oxygen in the air and ultraviolet rays in the sun cause thermal oxidation or photooxidation of plastic materials, which deteriorates the physical and mechanical properties of polyolefin materials used for photoelectric cable sheaths and insulation, and loses their original functions and use value in advance. Due to the different molecular structures of plastic materials, or the same molecular structure due to different polymerization processes, different processing techniques, and different use environments and conditions, their own thermal oxidati...

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Problems solved by technology

For electric cables or optical cables, the service life is generally required to be not less than 20 years; for this reason, the national standard GB / T 15065-2009 of the People's Republic of China "Black Polyethylene Plastics for Wire and Cable" stipulates that black environmental cracking-resistant low-density polyethylene The oxidation induction period of vinyl sheathing material (NDH), black linear low density polyethylene sheathing material (LDH), black medium density polyethylene sheathing material (MH), black high density polyethylene sheathing material (GH) must not However, due to the increasing competition, a variety of wire and cable sheathing materials made of recycled plastics have appeared on the market. This material has serious sheath cracking, deformation, and early failure in less than 5 years of use. Aging reduces the service life of the cable. For this reason, the user needs to conduct a relatively strict test on the oxidation induction period

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