January 27, 2020

Environmental-friendly soft polyvinyl chloride cable formulation design points

Selection of Resins The first issue in the formulation of cable materials with good processability and physical and mechanical properties is the selection of suitable PVC resins. The higher the degree of polymerization (molecular weight) of PVC, the higher the tensile strength, impact strength, and elastic modulus of the product, and the better the resistance to heat and cold, but the melt flowability and plasticity of the product decrease, and the processing temperature increases. Research and trials have shown that PVC resins with a degree of polymerization of about 1000 to 1300 (loose, K values ​​of 60 to 75) are more suitable for the preparation of cable materials.

Selection of Environment-Friendly Stabilizer PVC resin is extremely unstable to heat, and when it is heated, its temperature exceeds 90°C. It begins to decompose. When the temperature is higher than 120°C, it decomposes obviously, releasing a large amount of hydrogen chloride (HCl) gas, with the increase in the amount of escaped HCl. The color gradually darkens. Therefore, pure PVC resin without stabilizers cannot be processed and applied.

The stabilizers commonly used in PVC processing include lead salts and chromium salts, but stabilizers containing heavy metals such as lead salts and chromium salts cause serious heavy metal pollution to the environment. For this reason, the current use of stabilizers tends to be environmentally friendly. The first is the use of organotin stabilizers, which have the advantages of good stability and low dosage. They are mainly used in highly transparent hard and soft products, but organotins are mostly toxic, and most of them have special odors. The hue at the beginning of processing is good, but it will be discolored and appear dark spots later; the second is to use calcium stearate and zinc stearate together with chelating agent. However, domestic ordinary calcium/zinc stabilizers have too short thermal stabilization time and thermal stability cannot meet the requirements of the wire and cable industry. Selection of internationally renowned imported calcium/zinc stabilizer brands A, B, C, D, E, F, G, H, I, J, and thermal stability of cable materials produced using these stabilizers in accordance with GB8815-2002 The test results are shown in Table 1 (the amount of the other main raw materials is PVC: 100 phr, dioctyl phthalate: 50 phr, and calcium carbonate: 30 phr).

As can be seen from the data in Table 1, the thermal stability of stabilizers A, B, C, E, G, and I is better, while J, D, and H are a little worse. According to different product varieties GB8815-2002 standard soft PVC plastic heat stability time requirements between 50 ~ 180min. From the test data in Table 1, we can see that for the stabilization effect, the cable material series products using this stabilization system meet the requirements of soft PVC plastics for wire and cable, and the determination of specific stabilizer species can be determined according to the type of cable material produced.

Selection of plasticizers Soft PVC plastic compounds, the main plasticizer in the formula can be based on different temperature levels and use of phthalates, such as dioctyl phthalate, diheptyl phthalate, o-benzene Diisodecyl dicarboxylate; terephthalic acid, such as dioctyl terephthalate; trimellitic acid, such as trioctyl trimellitate. These main plasticizers for PVC plastics for wire and cable can be used alone or in combination with one another. In order to improve certain properties (such as anti-aging properties) of soft PVC cable, auxiliary plasticizers such as epoxidized soybean oil and epoxidized butyl oleate are also added.

Selection of fillers and other processing aids The fillers in soft PVC cable materials are mainly calcium carbonate and calcined clay. Calcium carbonate has little effect on the insulation properties of cable materials. It mainly plays a role in reducing the cost in the formulation of cable materials; calcined clay is the main additive for improving the insulation properties of cable materials, and the amount is generally 5 to 15 phr. The lubricant used is a lubricant commonly used in cable materials, such as polyethylene wax, and the amount thereof is generally 0-2.5 phr.

 XLPE insulated electrical Power Cable consists of  below  major components: one or more high quality stranded copper or aluminum conducts, XLPE insulation, fixed tape and filler, optional protective armour, overall PVC sheath

These cables are with simple structure, light weight and high heat resistance. With the development of our technology, our factory is able to manufacturing our products more lighter, durable and flexible for international requirements.

It could be classified into 3 type as below:

Non-armoured XLPE Power Cable(Cu or Al /XLPE/PVC)

Steel Tape Armoured Power Cable(Cu or Al/XLPE/STA/PVC)

Steel Wire Armoured Power Cable(Cu or Al/XLPE/STA/PVC)

 XLPE insulated power cables

Manufacture Standard

This cable is manufactured according to the standard of GB12706-2008(The Same as IEC60502).It can also be manufactured according to IEC,BS,UL as request.

 

Using features

l  Max. permissible continuous operating temperature of conductor is 90℃. 

l  Max. temperature of conductor during short circuit (5s maximum duration ) shall not exceed 250℃. 

The ambient temperature under installation should not below 0℃. 

The bending radius of a single-core cable: not less than 20 times of cable`s OD 
The bending radius of a three-core cable: not less than 15 times of cable`s OD 

 steel tape armor power cables

Why choose XLPE Insulated Power Cable?

l  Heat resistant performance-With XLPE special structure, it will not be decomposed and carbonized up to 300℃ with at most 40 years life time.

l  Insulating Performance-Same insulation characteristic as PE, higher electrical resistance and less impact by temperature.

l  Mechanical Performance-Higher hardness, stiffness, abrasion resistance and shock resistance.

l  Chemical performance-XLPE has higher resistance to acid and alkaline. It only produce water and carbon dioxide, it shows more environmental friendly which could satisfy modern requirements of fire safety.

Application:

This product is suitable for transmission and distribution of electrical power with AC rated voltage 0.6/1Kv,1.8/3 kV,3.6/6 kV,6/10 kV,8.7/10 kV,8.7/15 kV,12/20 kV,26/35kV kV. Such as power distributing systems, industrial plant and others.

 

You are always welcome to contact us if you have any questions about XLPE electrical power cables. We will offer you professional solutions as you required with attractive price.

XLPE Insulated PVC Sheathed Power Cable

XLPE Insulated PVC Sheathed Power Cable,Power Cable With XLPE Insulator,XLPE Insulation Power Cable,XLPE Insulated Power Cable

Fujian Lien Technology Co.,Ltd , http://www.liencable.com