Low-smoke halogen-free anti-flaming and insulating material used for manufacturing photovoltaic cable and manufacturing method of low-smoke halogen-free anti-flaming and insulating material

Abstract

The invention discloses a low-smoke halogen-free anti-flaming and insulating material used for manufacturing a photovoltaic cable and a manufacturing method of the low-smoke halogen-free anti-flaming and insulating material. The low-smoke halogen-free anti-flaming and insulating material is prepared by the following steps according to weight ratio: 30-40 parts of ethylene-EVA(Ethylene vinyl-acetate copolymer) with the content of VA of 28 percent or above, 10-20 parts of HDPE (high density polyethylene), 20-30 parts of a halogen-free flame retardant, 10-20 parts of a polyphosphazene fire retardant, 1-5 parts of functional polyolefin resin, 1-2 parts of an antioxygen, 1-2 parts of a light stabilizer, 1-2 parts of an ultraviolet light absorber, 0.1 to 0.3 part of an Ir 1024 anticopper agent, 1-2 parts of a lubricant and 1-2 parts of a crosslinking sensitizer are mediated through a high speed kneader or internally mixed through an internal mixer, and then plasticized and extruded through a double-screw extruder, and then squeezing granulation is performed through a single screw extruder. Single layer insulation of a cable made of the anti-flaming and insulating material provided by the invention can meet the requirements of heat, damp and chemical attack resistance, weather proofing, ozone resistance, wear resistance, direct voltage resistance, 250 DEG C thermal extension and low-smoke halogen-free flaming resistance in the EN50618 standard of EU photovoltaic cable standards.

Description

technical field [0001] The invention relates to a low-smoke, halogen-free, flame-retardant insulating material for making cables used in high-power solar power generation devices and a manufacturing method thereof. Background technique [0002] As an environmentally friendly and sustainable green new energy, high-power photovoltaic power generation has been widely valued at home and abroad, while photovoltaic power stations have high technical performance requirements for photovoltaic cables, and the products should meet the heat resistance requirements of the EU photovoltaic cable standard EN50618 , heat and humidity resistance, low temperature resistance, chemical corrosion resistance, weather resistance, ozone resistance, wear resistance, DC voltage resistance, 250°C thermal extension and low-smoke, halogen-free flame retardant and other properties, and the service life reaches 25 years. [0003] The cable materials in the prior art are still insufficient in terms of DC v...

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Problems solved by technology

[0003] The cable materials in the prior art are still insufficient in terms of DC voltage resistance and thermal extension at 250°C. Due to the poor mixing effect of the twin-screw conveying device in the production equipment currently in use, nano-scale materials cannot be mixed with a content of 28%. The above ethylene-vinyl acetate copolymer EVA resin materials are mixed evenly, and only micron-sized flame retardants and ethylene-vinyl acetate copolymer EVA with a content of 18% can be used to achieve the same flame-retardant effect. The amount of additives is 2-3 times that of nano-scale flame retardants. A single insulating material needs to add a large amount of flame retardants and additives to meet the requirements of flame retardancy and weather resistance, resulting in low resin content and a sharp drop in insulation performance. The inner layer insulation is installed, because the inner layer insulation has low performance requirements for heat resistance, humidity resistance, low temperature resistance, chemical corrosion resistance, weather resistance, ozone resistance, wear resistance and low-smoke, halogen-free flame retardant, etc., so the used The amount of flame retardants and additives added to the insulating material can be reduced, the resin content is increased, and its insulation performance is improved; that is, to meet the requirements of the above performance indicators for photovoltaic cables in photovoltaic power stations, double-layer insulation structures must be used. The inner layer insulation guarantees the insulation performance, and the outer layer insulation ensures heat resistance, humidity resistance, low temperature resistance, chemical corrosion resistance, weather resistance, ozone resistance, abrasion resistance, DC voltage resistance, 250°C thermal extension and low-smoke halogen-free flame retardancy and other properties

The insulation volume of the double-layer insulation structure is large, the cost is high, and the overall performance is still poor; and the production is cumbersome, and the process control is cumbersome. When extruding the outer layer insulation, it is necessary to apply talc powder between the two layers of insulation. If the uniformity of talc powder is not well controlled, it will cause In the irradiation process, the outer insulation of the heated outer layer has a bulging phenomenon, which makes the finished cable scrapped and the yield is low.

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