Ultraviolet light crosslinking type low-smoke halogen-free flame-retardant cable material masterbatch and its preparation method and application

Abstract

The invention discloses an ultraviolet crosslinking type low-smoke halogen-free flame retardant cable material master batch and a preparation method and an application thereof. The master batch comprises a basic resin component, an amine graft, an inorganic flame retardant, a synergistic flame retardant, an auxiliary crosslinking agent and a photoinitiator, wherein the co-crosslinking agent comprises a compound shown in the formula (1), triallyl isocyanurate and polybutadiene rubber, R is as shown in the specification, m is an integer of 1-50, and PEG is polyethylene glycol with an average molecular weight of 200-600. The preparation method includes mixing the remaining raw materials except the auxiliary crosslinking agent and the photoinitiator to obtain a resin compound; mixing the auxiliary crosslinking agent and the photoinitiator to melt into a liquid composition; adding the resin composition and the liquid composition into an extruder respectively, and melting and extruding the compositions to obtain the product. The master batch is taken as an additive in conventional low-smoke halogen-free flame retardant products, the conventional products are endowed with ultraviolet cross-linking characteristics, the crosslinking speed is high, and the temperature tolerance grade and the like of common products can be improved.

Description

technical field [0001] The invention belongs to the field of low-smoke, halogen-free, flame-retardant cable materials, in particular to low-smoke, halogen-free, and flame-retardant cable materials that can be cross-linked by ultraviolet light, and in particular to a master batch of ultraviolet-light cross-linking low-smoke, halogen-free, and flame-retardant cable materials. Its preparation method and application. Background technique [0002] At present, with the development of society and the continuous improvement of environmental protection and safety requirements, it is difficult for the previous halogen-containing or non-flame-retardant cable materials to meet the environmental and safety requirements. As a substitute, low Smoke-free halogen flame-retardant cable materials are gradually expanding the market. [0003] For low-smoke halogen-free flame-retardant cable materials, the most commonly used flame retardants are aluminum hydroxide and magnesium hydroxide, both o...

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Problems solved by technology

[0005] Among them, the silane crosslinking is by adding a silane crosslinking agent, and after the resin is extruded, it is boiled in water or placed outdoors to absorb moisture in the air and then crosslinked, but for the use of aluminum hydroxide and / or magnesium hydroxide For low-smoke, halogen-free, flame-retardant cable materials used as flame retardants, aluminum hydroxide and / or magnesium hydroxide are easy to absorb water, which will further easily lead to pre-crosslinking of the cable materials, thereby affecting the final performance of the product, and at the same time Boiling in water or standing for a long time will increase production costs and / or reduce production efficiency. Reduce the electrical properties of the cable material to a certain extent;

[0006] Irradiation cross-linking is to add a sensitizer, and after the resin is extruded, it is irradiated and cross-linked by electron irradiation equipment. It will cause inhomogeneity of the crosslinking effect of the material, which will affect the overall performance of the cable material. At the same time, the electron irradiation equipment (commonly used electron accelerator) is expensive, which is not conducive to reducing production costs.

[0007] Ultraviolet light crosslinking, Ostcr first reported the photocrosslinking phenomenon of polyethylene in 1956. In the presence of photosensitizers, ultraviolet light can make polyethylene crosslinked. At the same time, the photocrosslinking method requires simple process equipment and less investment However, due to the poor penetration of ultraviolet light itself and the low speed of photo-initiated cross-linking reactions of resin polymers such as polyethylene, photo-cross-linking methods have not been well applied in the cable industry.

[0008] In addition, the current low-smoke halogen-free flame-retardant products are basically specific formulas customized according to customer needs. In practical applications, re-developing specific formulas is not only time-consuming and labor-intensive, but also expensive, which is not conducive to improving efficiency and Reduce R&D costs

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