Лако-красочные материалы — производство

Available as both thermoplastic and thermoset resins, polyimides (PI) are a family of some of the most heat — and fire-resistant polymers known. Polyimide is said to possess a greater resistance to heat than any other unfilled organic material. Unlike most plastics, PI are available in laminates and shapes, moulded parts and stock shapes. Polyimide parts are fabricated by techniques ranging from powder-metallurgy methods to conventional injection, transfer and compression moulding and extrusion. In general, mouldings and laminates are based on thermoset resins, although some are made from thermoplastic grades. Laminates are based on continuous reinforcements where moulding resins contain chopped (short) fibre reinforcements. ‘Kapton®’ is one of the best-known trade names.

Polyimides can be bonded with cyanoacrylates (Table 3.6) but the rigidity of these adhesives often results in a high stress concentration at the periphery of the joint and this induces premature failure of the material (see Section 10.3.4).