Global energy is accelerating its transformation to be efficient, clean, and sustainable. The development of clean energy is also an important factor affecting the global economy and ecological environment. Photovoltaic solar energy has the advantages of low carbon, environmental protection and high efficiency, and has gradually developed into the main force of green energy.
In solar photovoltaic power generation systems, photovoltaic solar panels are mainly composed of tempered glass, photovoltaic film, and cells. The photovoltaic packaging film plays a vital role in improving the quality of photovoltaic modules and maintaining the efficient operation and power stability of cells. The role!
However, the current adhesive film production technology on the market has not yet reached a mature level. Film manufacturers and module manufacturers will still encounter different difficulties in the production stage. This article will discuss this with you.
Issues that film manufacturers and module manufacturers need to address
| Stage | Requirements |
| Extrusion | Increase the extrusion speed, no material accumulation, less slipping |
| Film formation: | few crystal points, high VR value |
| encapsulation | Cannot slip and shift, reducing loss rate |
| components | Resistant to potential induced attenuation, high transmittance |
The following editor summarizes three case analysis problems and ideas for solving them.
Case number one
POE membrane adopts traditional process solution
Ingredients: POE/Liquid: (silane/acrylate co-crosslinker/crosslinker)
Problem points: High scrap rate, average PID
Traditional POE film is soaked (silane, acrylate co-crosslinking agent, cross-linking agent) and pre-mixed. At this stage, liquid adsorption will take a long time, which may take eight hours or even longer, affecting production efficiency. If the precipitation is incomplete, it will cause slippage at the discharge port.
When the component factory encapsulates the cast film, incomplete adsorption will cause the liquid to leak, migrate to the surface, become sticky and thick, and easily block the vacuum port.
After the component is finalized, it is cured at a high temperature of 160 degrees. The silane monomer cannot be fixed in a short time, which will affect the PID and deteriorate the aging resistance.
Solutions
POE membrane adopts graft masterbatch solution
Ingredients: POE/silane graft masterbatch/silane (a small amount)/acrylate (a small amount)/acrylic acid graft masterbatch/cross-linking agent
The total amount of liquid is reduced, the soaking time is shortened, and the extrusion slippage phenomenon will be improved.
After extrusion and tape-casting at 80 degrees, because the grafting is relatively stable, the silane is fixed on the POE and is not prone to migration, which means that vacuum blocking, slipping and shifting, and scrapping will also be improved.
Finally, in the high-temperature stage, because the grafted silane will share the actions required for curing, the adhesive efficiency will be improved, and ultimately the PID aging resistance of the entire component will be improved.
Case 2
EVA film adopts traditional technology
Problem: The bonding strength drops significantly after high temperature and high humidity aging.
The traditional method is to add silane to EVA, and then add acrylate co-crosslinking agent. There will be some problems in the traditional method. When doing PCT experiments, under high temperature and high humidity, the acrylate bond is easily hydrolyzed and broken, resulting in a decrease in peeling force, and then Affects aging and PID performance.
Solutions
EVA film adopts graft masterbatch solution
Ingredients: EVA/silane graft masterbatch/silane (a small amount)/acrylate (a small amount)/cross-linking agent
We will choose some oligomers or other types of silane to graft EVA, which is less likely to block the vacuum. Finally, during the PCT test of this component, after grafting, the silane is relatively stable and fixed on the EVA, so it is resistant to hydrolysis. Sex will be greatly improved.
Case three
EPE film uses traditional methods
Problem: The cross-linking degree of E and P layers is difficult to match and easy to foam.
When making a three-layer co-extrusion, it is expected that the middle POE layer and the upper and lower EVA layers can achieve similar viscosity or adhesive speed. The traditional method is to add a liquid acrylic cross-linking agent to the POE.
POE is non-polar and does not adsorb reliably to acrylate. If left for a long time, the acrylate will easily migrate out and be absorbed by the upper and lower layers of EVA, resulting in deviations in the degree of cross-linking, wrinkling and blistering.
Solutions
Use acrylate graft masterbatch to replace the direct addition of acrylate in the P layer
Three-layer co-extrusion, acrylic graft masterbatch promotes cross-linking, prevents migration, completes cross-linking, and improves the results.
About Coace
Founded in 2009, Coace Chemical Co., Ltd. is a high-tech enterprise specializing in polymer functional materials, dedicated to the research, development and production of plastic modifiers. Since its establishment, the company has been guided by the spirit of “constant products, advancement, and globalization” and has served the market with an efficient and sincere work style, winning praise from our customers. Contact us: 4009957756.
