Fireproof cable wrapping nano-material and preparation method thereof

Abstract

The invention discloses a fireproof cable wrapping nano-material and a preparation method thereof. The preparation method comprises the steps: drying a raw material, namely EVA (Ethylene-Vinyl Acetate copolymer), for 5.5-6 hours at the temperature of 95 DEG C for later use, sequentially adding LDH, of which the ratio is 3phr, 6phr, 9phr and 12phr respectively, and modified hydrotalcite into a twin-screw extruder SHL-35, then, carrying out extrusion granulation, and adding 6-10 parts of nano activator, 3-8 parts of accelerant, 0.5-1.6 parts of plasticizer and 1-4 parts of anti-aging agent, wherein the extrusion temperature is set to be 180 DEG C, 185 DEG C, 195 DEG C, 195 DEG C and 185 DEG C sequentially, and the revolution rate of a principal machine is 40 revolutions per minute; then, carrying out compacting molding on the dried granular material with a plate vulcanizing machine at the temperature of 190 DEG C. According to the fireproof cable wrapping nano-material and the preparation method thereof, the mechanical properties, flame retardance and heat resistance of nano synergistic-modified flame-retardant EVA are relatively good.

Description

technical field [0001] The invention belongs to the technical field of cable materials, and in particular relates to a fireproof cable outsourcing nano material and a preparation method thereof. Background technique [0002] With the continuous development of computer and network engineering, more and more people use multiple computers and large computers. Out of consideration for the safety of the computer room, people have gradually realized the use of cables made of high temperature resistant materials. At present, the cables used in this field generally use halogen-free flame-retardant cables and silane cross-linked cables. Ethylene-vinyl acetate copolymer is the most used material in halogen-free flame-retardant cables, semiconductor shielded cables and two-step silane crosslinked cables. Ethylene-vinyl acetate copolymer, also known as EVA resin, has a molecular formula of C6H10O2 and a molecular weight of 114.1424. Ethylene-vinyl acetate copolymer is obtained by cop...

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Problems solved by technology

[0006] However, most of the intumescent flame retardants are still in the research stage of the laboratory and have not been industrialized. The main reasons are as follows: (1) The intumescent flame retardants have strong hygroscopicity

For example, the intumescent flame retardant with APP / MEL / PER as the main component is more prone to alcoholysis between the various components, which makes the water resistance of the flame retardant matrix decrease.

(2) The intumescent flame retardant has poor compatibility with the matrix, which reduces the insulation and electrical properties of the matrix, especially the mechanical properties such as impact strength and tensile strength.

(3) The relative molecular weight of the intumescent flame retardant is relatively small, and it is easier to migrate to the surface of the polymer, which will also reduce the thermal stability of the material, and eventually lead to a decrease in the physical and mechanical properties and appearance of the matrix.

(4) The theoretical ratio between the intumescent flame retardant and the matrix is ​​still unclear

(5) The addition amount of intumescent flame retardant still needs to be relatively large

[0012] In the prior art, the halogen-containing flame retardant system also has a good flame retardant effect on EVA, and the combination of decabromodiphenyl ether and antimony trioxide can obtain a good flame retardant effect, but because the brominated flame retardant will produce Due to the disadvantages of toxic gas and dense smoke, it is not widely used in flame retardant materials for wires and cables.

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