Anti-cracking detection method for low-smoke halogen-free sheath material

Abstract

The invention discloses an anti-cracking detection method for a low-smoke halogen-free sheath material. The anti-cracking detection method comprises the following steps of preparing a to-be-detected low-smoke halogen-free sheath material into a test piece by adopting a mold pressing method; preparing a surfactant into a reagent; cutting a sample from the test piece, and nicking; bending the sample and inserting the sample into a test rack with a groove with an outward nick, placing the test rack in a test tube, filling the test tube with a reagent, and immersing the sample in the reagent; putting the test tube into a constant-temperature bath pan, and keeping the constant temperature for 24 hours; and detecting whether the sample is cracked or not, and if the sample is not cracked, judging that the low-smoke halogen-free sheath material to be detected has no cracking risk, thereby ensuring that a cable is not cracked in the use process. The detection method is simple, and the anti-cracking performance of the low-smoke halogen-free sheath material can be rapidly and effectively detected, so that cable cracking is effectively avoided and prevented.

Description

technical field [0001] The invention relates to a detection method for cable materials, in particular to a detection method for anti-cracking of low-smoke and halogen-free sheath materials. Background technique [0002] Low-smoke halogen-free flame-retardant cables are made of one or more halogen-free polymers or copolymers, which are made of rubber with halogen-free flame retardants and other modified additives, and will not emit toxic fumes when burned environmentally friendly cables. Low-smoke halogen-free flame-retardant cables have superior flame-retardant properties, produce less smoke when burning, and have no corrosive gas escape. They are widely used in nuclear power plants, subway stations, high-rise buildings, hotels, hospitals, radio and television stations, and important military facilities. Concentrated places with low air density. [0003] However, low-smoke halogen-free flame-retardant cables have poor crack resistance, and cable cracks are prone to occur i...

AI Technical Summary

Problems solved by technology

[0003] However, low-smoke halogen-free flame-retardant cables have poor crack resistance, and cable cracks are prone to occur in practical applications, which reduces their actual service life and affects customers' concerns about product quality.

In 2019, our company adopted the low-smoke halogen-free sheath material from material manufacturer A, and three incidents of cable sheath cracking occurred in August, September and October respectively. The cracking resistance test is under consideration or not mentioned, and no corresponding testing standard has been formulated

It does not conform to the actual laying conditions on site

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