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.
