Abron R 750 Bismaleimide Resin

About Abron R 750 Bismaleimide Resin

PRODUCT TRADE NAME      : ABRON R 750
PRODUCT TYPE                   : POLYIMIDE RESIN (Bis-itaconimide type) Powder Resin

As a result of the efforts of Indian Space Research Organization to develop a processible polyimide, a prepolymer having excellent processability, stability at room temperature and with moderate cure temperatures was developed. Composites made from this prepolymer have yielded components for space and aerospace applications. ABRON-R 750 is being manufactured by A B R ORGANICS LIMITED with the license from Indian Space Research Organization.

ABRON-R 750 is highly amenable for polar & filament winding technology also. The prepregs made from ABRON-R 750 have a long shelf life of 3 to 6 months at room temperature.

GENERAL PROSEDURE FOR MAKING LAMINATES

Silica/Glass/Carbon cloth is impregnated with the resin solution. The solvent is allowed to evaporate (at 55 60C when DMF is used as an solvent). The prepreg should have resin content of 35 40% weight.

The tack & drape of the prepreg is controlled by adjusting the residual solvent content.

The prepregs are stacked in mold and heated to 120C and held for one hour under 60 psi pressure. The mold temperature is raised to 160 165 C as a second step and maintained for another hour. Final cure is done by heating the mold to 200 220 C for 2 hours under pressure. The laminate is released after cooling under pressure to 80 100 C. Post curing is to be done at about 125 C for 6 hours.

This procedure, however is not same for all shapes and thickness of laminates. The exact cycle has to be determined based on trials.

APPLICATIONS

• Aerospace & space applications as resin matrix for composites
• Slot wedges for locomotive traction motors

SPECIFICATIONS OF ABRON R 750

MECHANICAL PROPERTIES OF LAMINATES (ASTMD 1184)

CARBON FIBRE ( UNIDIRECTIONAL)

GLASS FIBRE ( UNIDIRECTIONAL )

ELECTRICAL PROPERTIES OF GLASS POLYMIDE COMPOSITE

• Dielectric Constant at 10 KHz frequency with 3.3 mm thick laminate = 2.1
•  Descipation factor at 10 KHz frequency with 3.3 mm thick laminate = 0
•  a) Electromagnetic radiation transparency with unidirectional glass/ PI laminate at 11.9 G.Hz - 89%
• b) Glass cloth PI laminate - 52% c) Glass cloth-epoxy laminate - 5 6%

The above properties meet the requirements of composites functioning uptoo 220C and at 400C for short duration application.

MECHANICAL PROPERTIES OF LAMINATES BASED ON ABRON R 750

MECHANICAL PROPERTIES OF THERMALLY AGED PROPERTIES

Value obtained after soaking the sample for 100 hrs at 200C.