About the role of BT-Epoxy in BT PCB
BT Epoxy belongs to the category of thermosetting resin used in printed circuit board (PCB). It is a mixture of epoxy resin, which is the common raw material of PCB and BT resin. BT stands for bismaleimide triazine resin. This is a mixture of bismaleimide, which is also used as a raw material for PCBs and cyanate esters. The three cyano groups of cyanate ester are trimerized to triazine ring structure, so they are named T.To get more news about BT PCB, you can visit pcbmake official website.
In the presence of bismaleimide, the double bond of maleimide group can be copolymerized with cyano group to form a 6-membered heterocyclic ring with two nitrogen atoms (pyrimidine).
The curing reaction takes place at temperatures up to 250 ° C and is catalyzed by strongly basic molecules such as DABCO (diazabicyclooctane) and 4-DMAP (4-dimethylaminopyridine)). Products with very high glass transition temperature (TG) up to 300 ℃ and very low dielectric constant can be obtained. These characteristics make these materials very suitable for use in PCBs that are often subjected to such conditions.
BT Epoxys are widely selected for their excellent thermal, mechanical and electrical properties. The laminate is suitable for lead-free PCB assembly. It is mainly used in multilayer board applications. It has excellent electromigration, insulation resistance and high heat resistance. It also maintains bond strength at high temperatures.
Epoxy coatings have long been used in marine, architectural and industrial environments because they provide a high level of protection as final coatings. According to the Chicago Tribune, this intensity and clarity has been increasingly used by craftsmen and artists. It has been found to be very useful in the food industry, where spills of oil and food can make the floor slippery. Epoxy flooring is preferred for warehouse floors. Although practical, it can also be fashionable. It has a wide range of uses and a variety of colors to choose from. This is a real low maintenance option. In this case, this is the best solution.
“BT” is the chemical trade name of resin produced by Mitsubishi Gas Chemical Corporation. The resin is synthesized from bismaleimide (Bismaleimid, referred to as BMI) and cyanate ester (abbreviated as CE) resin. As early as 1972, Reiki Chemical Company began to study BT resin. By 1977, BT boards began to be used in chip packaging soil, and then they continued to conduct in-depth research. There are more and more paper sheets on the market. According to a survey conducted by Japan JPCA on the sales of various household glass cloth-based panels in 1999, the sales volume of BT resin-based panels is second only to FR-4 panels. , Reaching 36 billion yen.
Due to the importance of BT resin substrate, it has been listed in some authoritative standards in the world, for example, EC 249-2-1994 is listed as “No.18” board, and IPG4101-1997 is listed as “30” board: MIL -S-13949H is defined as “GMr board, and the product standard formulated by JIS for such products is JS C-6494-1994. my country’s national standard GB/T 4721-1992 also defines it as BT” board.