A kind of anti-uvled light attenuation radiation cross-linked polyethylene insulating material and preparation method thereof

Abstract

Disclosed is an anti-UV LED light decay, radiation cross-linked polyethylene insulating material, and a preparation method thereof. The raw materials comprise a matrix resin, a specific photoinitiator, a specific photoinitiator aid, and a specific multi-functional group crosslinking aid. The matrix resin is composed of polyethylene resin, a light-transmitting resin, and an ethylene-vinyl acetate copolymer. The preparation method comprises weighing each raw material in accordance with a formula, mixing and stirring the polyethylene resin, the specific photoinitiator, the specific photoinitiator aid and the specific multi-functional group crosslinking aid to prepare a premix, mixing the premix with the remaining raw materials, and extruding same to form and obtain an insulating material. The insulating material of the present invention can be processed at a low temperature, and has a sufficient degree of crosslinking without the need to reduce the extrusion speed.

Description

technical field [0001] The invention belongs to the field of ultraviolet light cross-linked polyethylene insulating materials, and in particular relates to an anti-UV LED light decay radiation cross-linked polyethylene insulating material and a preparation method thereof. Background technique [0002] With the continuous progress of science, a new UVLED ultraviolet light source based on LED point light source has emerged. This light source is more energy-saving, environmentally friendly, mercury-free, can work under low temperature conditions, and has a longer service life. Specifically, compared with traditional high-pressure mercury lamps, UVLED has many characteristics: 1. Longer service life, about 35,000 hours; 2. Low energy consumption. Compared with traditional high-pressure mercury lamps, it can save energy by 90%; 3. Cold light source, no infrared heat radiation; 4. No mercury, safe and environmentally friendly; 5. Stable light output; 6. Low maintenance cost, more ...

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Problems solved by technology

[0003] At present, during the production and processing of polyethylene insulating materials for cables, the temperature of the extruder is as high as 170-190°C, and the temperature of the head is higher, as high as 195-210°C. Only in this temperature environment can the polyethylene material be melted completely and more transparent. At the same time, it is more conducive to the penetrating irradiation of ultraviolet rays, but the temperature of the cable prepared in this way is too high, resulting in a high ambient temperature in the ultraviolet irradiation equipment in the same room, high temperature coupled with long-term work, It caused serious light decay of the UVLED lamp bead light source, and the intensity of ultraviolet light decreased; according to the actual situation of the current cable factory: when the UVLED light source on the market is working for 18000-20000h during the normal cable extrusion process, it will cause the UVLED light source to break down. 15%-30% light decay, the result of this is that at the same extrusion speed, the degree of crosslinking of the cable insulation layer is not enough, showing that the thermal extension of the material is unqualified (that is, if the deformation is large under the action of heat and load, it will lose Mechanical properties, until it causes a short circuit, the cable cannot be used normally), and currently the following two methods are usually used to solve the above problems, one of which is to increase the light time by reducing the extrusion speed, but it will inevitably cause production efficiency. The cost of artificial water and electricity has increased significantly, so the overall cost has not decreased; another way is to replace the whole set of UVLED light source. The price of 45-60% of the equipment is about 110,000, that is to say, the light source needs to be replaced after more than 2 years of actual production and use of the whole set of equipment, which also greatly increases the cost of the cable factory

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