Preparation method of flame retardant flexible heat-shrinkable tube

Abstract

The invention relates to the technical field of preparation of tubes, in particular to a preparation method of a flame retardant flexible heat-shrinkable tube. The preparation method comprises the following steps: mixing phragmites australis powder, organic modified hydrotalcite and ethyl acetate to obtain wood stone fibers; putting high density polyethylene masterbatch particles into a rubber refining machine for smelting and doping the wood stone fibers to obtain a rubber compound; transferring the rubber compound to an internal mixer and doping an ethylene-vinyl acetate copolymer for treatment to obtain the flame retardant flexible heat-shrinkable tube. The lignin is adsorbed to the fiber surface and in pores, so that an interfacial binding force between wood fibers and polyethylene isenhanced and further the heat-shrinkable tube becomes soft and resilient; the magnesium aluminum hydrotalcite is enabled to lose interlayer water molecules and interlayer anions and a dehydroxylationreaction is initiated in the combustion process of the heat-shrinkable tube, so as to play a role of protecting polymers and isolating air and further improve the flame retardant property of the heat-shrinkable tube. The broad application prospect is achieved.

Description

technical field [0001] The invention relates to the technical field of pipe material preparation, in particular to a preparation method of a flame-retardant flexible heat-shrinkable sleeve. Background technique [0002] Heat shrinkable sleeves, also known as heat shrinkable protective sleeves, provide insulation and protection for wires, cables and wire ends. Due to the advantages of high-temperature shrinkage, softness, flame retardancy, and insulation and corrosion resistance, heat shrinkable sleeves are widely used for insulation protection of various wiring harnesses, solder joints, and inductors, as well as rust and corrosion protection for metal pipes and rods. As the outer insulating coating of these components, on the one hand, it can effectively protect the electronic components, and on the other hand, the information of the electronic components can be marked on the surface of the heat shrinkable tube for easy identification. [0003] Common methods for preparing ...

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Problems solved by technology

[0006] The technical problem mainly solved by the present invention is that the current heat-shrinkable sleeve material is mainly plastic, due to the limitation of materials, the heat-shrinkable material often does not have good flame retardancy, and the toughness of the heat-shrinkable sleeve is poor. , the defect of stress cracking is prone to occur at the bend, and a preparation method of a flame-retardant flexible heat-shrinkable sleeve is provided

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