Low-smoke halogen-free phosphorus nitrogen expanding flame-retardant mold shrinkage sleeve and preparation method and application thereof

Abstract

The invention discloses a low-smoke halogen-free phosphorus nitrogen expanding flame-retardant mold shrinkage sleeve and a preparation method and application thereof. The low-smoke halogen-free phosphorus nitrogen expanding flame-retardant mold shrinkage sleeve contains 85 to 95 parts of polyolefin resin, 5 to 15 parts of maleic anhydride copolymerization modified ethylene-vinyl acetate copolymer, 30 to 70 parts of nitrogen phosphorus series expanded halogen-free flame retardant, 0 to 16 parts of expansible graphite, 1 to 3 parts of lubricating agent, 0.5 to 2.5 parts of antioxidant, 1 to 2.5parts of sensitizer and 5 to 8 parts of black master batch. The preparation method comprises the following steps of: mixing the raw materials uniformly, extruding the mixed raw materials at the temperature of between 100 and 160 DEG C by using a double-screw extruder, and performing wire drawing, air cooling and granulation; pressing the granules into a mold shrinkage sleeve, and performing irradiation, wherein the irradiation dose is 8 to 12Mrad; and expanding and drawing the irradiated and cross-linked mold shrinkage sleeve at the temperature of between 140 and 160 DEG C, cooling and setting, and thus obtaining the low-smoke halogen-free flame-retardant mold shrinkage sleeve. The preparation method is simple; and the obtained mold shrinkage sleeve has excellent flame-retardant performance, low smoke generating quantity and good mechanical property, electrical insulating property and heat resistance.

Description

technical field [0001] The present invention relates to a flame-retardant mold shrink sleeve mainly using ethylene-vinyl acetate copolymer as a matrix resin, in particular to a low-smoke halogen-free phosphorus nitrogen expansion flame-retardant mold shrink sleeve and its preparation method and application. Background technique [0002] Molded sleeves are mostly used for cable terminal connections, cable openings and bifurcated connections, providing good stress relief, sealing and mechanical protection, divided into T-shaped bifurcations, 45° bifurcations, 30° bifurcations, and Y-shaped bifurcations And other specifications, widely used in the design and assembly of aviation, aerospace and marine electronic and electrical equipment. In the early days, wrapping tape was used for wrapping treatment, which was easy to fall off, unsightly, and poor in reliability. The emergence of shrink sleeves has solved the above problems very well. Most of the early shrink sleeves were ha...

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Problems solved by technology

However, existing flame-retardant materials still have deficiencies, such as: the national invention patent with the publication number CN 101486814A and the name "Preparation method and sleeve of low-smoke, halogen-free, nitrogen-free, flame-retardant heat-shrinkable material sleeve" The application discloses a low-smoke, halogen-free, and nitrogen-free flame-retardant material. The flame-retardant ingredients include phosphorus-nitrogen intumescent flame retardant and microcapsule red phosphorus. The flame-retardant grade is FV-1, and the flame-retardant effect is not ideal. The presence of phosphorus can affect the environment

The national invention patent document with the publication number CN101012326A and the name "A Halogen-free Flame-Retardant Cable Sheathing Material" discloses a halogen-free flame-retardant cable sheathing material, which consists of 10 parts of expandable graphite, 90 parts of magnesium hydroxide, 2 to 5 parts of organic montmorillonite synergize with flame-retardant polyolefin, and the elongation at break of the composite material is less than 280%. Significantly reduces the mechanical properties of the material

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