Solar backplanes can be roughly divided into three types according to the structure: double-sided fluorine-containing backsheets, single-sided fluorine-containing backsheets, and fluorine-free backsheets. Both TPT and KPK in the title belong to the double-sided fluorine backsheet.

1.0TPT

The most common two-sided fluorine-containing backsheet on the market is TPT (polyvinyl fluoride composite film). TPT uses a composite process. The two-side fluorine-containing materials are Tedlar polyvinyl fluoride polymer PVF produced by DuPont, and the middle is PET. Adhesives are compounded together. The inner layer of fluorine material protects the PET from UV rays, and after special treatment, it is better bonded with EVA. The outer layer of fluorine material protects the back of the module from moisture, heat, and ultraviolet rays.

1.1PVF

Molecular formula: -[CH2-CHF]-

Scientific name: Polyvinyl fluoride.

White powder, partially crystalline polymer.

Fluorocarbon ratio (F/C): 0.5/1.

Fluoride content: 41.3%.

Flammability: Slow to self-extinguishing.

Density 1.39g/cm.

Melting point 190-200 °C, decomposition temperature above 210 °C, long-term use temperature -70-110 °C.

The softening point is about 200°C. However, at 200° C., thermal decomposition begins 15 to 20 minutes, and if it is at 235° C. for 5 minutes, it decomposes violently and finally carbonizes.

Double-sided fluorine-containing backsheets are similar, the difference being only in the composition of the fluorine material and in the special treatment of the inner fluorine material.

1.2 DuPont

DuPont is a large US chemical company. In 1802, it was established by French emigration EI Dupont near Wilmington, Delaware, USA, to produce gunpowder. In the 20th century, it began to diversify into products and investments. Its business scope covers military industry, agriculture, chemical industry, petroleum, coal, construction, electronics, food, furniture, textiles, refrigeration and transportation, and more than 20 industries in the United States and the world. 50 countries and regions have more than 200 subsidiaries and operating agencies, producing 1,700 categories of petrochemicals, household chemicals, pharmaceuticals, paints, pesticides, and various polymers, and more than 20,000 varieties. In 1983, the total sales amounted to USD 35.378 billion, ranking first among the annual sales of chemical companies worldwide.

2.0KPK

KPK is also a double-sided fluorine-containing backsheet. The difference is that its fluorine material manufacturer is Kynar polyvinylidene fluoride PVDF produced by Arkema in France.

2.1PVDF

Molecular Formula: [-CH2-CF2-]-

Scientific name: polyvinylidene fluoride

Polyvinylidenefluoride referred to as PVDF

White powdered crystalline polymer.

Fluorocarbon ratio; 1/1

Fluoride content: 59%.

Density 1.75-1.78g/cm3.

The glass transition temperature is -39°C, the embrittlement temperature is -62°C, the melting point is 170°C, the thermal decomposition temperature is 316°C or more, and the long-term use temperature is -40 to 150°C.

Can be molded using general thermoplastic processing methods. Its outstanding features are high mechanical strength and good radiation resistance.

With good chemical stability, it is not corroded by acids, alkalis, strong oxidants and halogens at room temperature. It can be swollen or partially dissolved by fuming sulfuric acid, strong alkalis, ketones and ethers. The strong polar organic solvent such as dimethyl sulfoxide can dissolve it into a colloidal solution.

2.2 Arkema Group

Arkema is a global leader in the production of chemicals. It consists of three closely-related and well-balanced business units: ethylene chemicals, industrial chemicals and specialty chemicals. Its global headquarters is located in France.

On May 12, 2006, Arkema became an independent chemical company (restructured by the Total Group assets) and has operations in over 120 countries (including 80 factories and 8 R&D centers) in more than 40 countries. 13,800 employees, with sales of 4.4 billion euros.

Since starting business in China in 1984, Arkema Greater China has taken the lead in many areas and currently has established four industrial production bases throughout China.

In 2007, Arkema announced the construction of a fluoropolymer Kynar® PVDF production facility in Changshu, China, and plans to start production in March 2011. Arkema has decided to accelerate the development of the Changshu plant and announced that it will increase the capacity of the Changshu plant by 50% by mid-2012. This investment is to meet the market's rapidly increasing demand for PVDF resin in emerging technology applications, especially in the areas of new energy and water treatment.

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