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Service > Silane crosslinked cable material

Silane crosslinked cable material

The heat resistance, mechanical properties and resistance to environmental stress cracking of polyolefin materials are poor, which limits its application in many fields. In the field of plastic processing, the method of cross linking is 3 kinds of method, irradiation method, peroxide method and silane method. Silane crosslinking method has the advantages of simple equipment, excellent effect, and many manufacturers are using the cable material.
Silane crosslinked cable material
Silane crosslinked polyethylene is made of two main processes: grafting and crosslinking. In the process of grafting, the polymer was produced free radicals, the H atoms of the tertiary carbon atoms, and the -CH=CH2 group of vinyl silane, and the grafted polymer containing three oxygen groups were generated. In the process of crosslinking, the grafted polymer first occurs in the process of water, and the Si-O-Si bond is formed by the condensation of -OH and Si-O-H groups.
Production mode of silane crosslinked cable and cable
As we all know, the production of silane crosslinked cable and cable and cable is divided into two steps and one step method. The difference of the two step and one step is the process of silane grafting, and the process of the grafting process is two step, and the grafting process is one step in the cable factory. At present the domestic market occupies a maximum amount of two step silane crosslinked polyethylene insulation material composed of the so-called material a and B material, a material for grafting has been the silane polyethylene, B material as catalyst masterbatch and its weight than general A:B=95:5, material a and B material by cable material factory made after the sale to a cable factory, cable factory in the use of the material a and B material according to the mixing ratio, in conventional extrusion machine can be squeezed cable insulation wire core, then in warm water or steam in the insulating layer of cross-linking.
There is also a kind of two step silane cross-linked polyethylene insulation material, the production method of A material is different, it is in the synthesis of polyethylene, the introduction of vinyl silane directly get the polyethylene, which is a kind of polyethylene, this method is the resin production technology, must be completed by a large petrochemical enterprises. The A material of LINKLON silane material in our country is the type of this type. At present, DOW and BOREALIS silane material is also for this type, the domestic petrochemical enterprises have no such type of product.
One step also has two types, the traditional one step process is to put all kinds of raw materials according to the formula by a special precision metering system, into a specially designed special extruder to complete the process of grafting and extrusion cable insulation wire core, in this process, do not need to granulation, do not need to participate in the cable material factory, by cable plant alone. The production device and formulation technology of this kind of one step silane crosslinked cable are mostly imported from abroad, and the price is expensive.
Another kind of one step silane cross-linked polyethylene insulation material is the cable material production factory production, is all the raw materials according to the formula of a special method to mix together, after the sale, no A material and B material, cable factory can be directly in the extrusion machine and extrusion cable insulation wire core. The uniqueness of this method is no need of expensive dedicated extruder in ordinary PVC extrusion machine can complete the process of silane grafted, and eliminating the second step in the extrusion of material a and B material mix of labor.
Market size
The main silane varieties used in the cross - linking of polyolefin are the vinyl silane, and the amount of the cross - linking agent is 1% to 2% (mass fraction). Crosslinked polyethylene is used to produce power cable material. Data show that in 2014 the annual production of power cable 55703700 meters, an increase of 8.87%, which uses the use of silane crosslinked cable material total demand of about 240000 tons, an increase of 9.1%. In addition to cable material, cross linked polyethylene is also used in the production of pipe, in 2014, China's polyethylene pipe production is estimated at 4420000 tons. Crosslinked polyethylene pipes in about 15% ~ 20% silane cross-linking method, mainly for on anti crack waterproof demand higher areas such as floor heating pipeline.
SAGSI analysis shows that the amount of silane used in cross linked polyethylene was about 11300 tons in 2014, about 6.6%. Is expected to grow at an average annual rate of 6.9% in the period 2014~2019, 2019 reached 15800 tons.

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