Impregnated reinforcing fiber yarn and its use in producing composite materials

摘要

A pre-impregnated yarn including a bundle of reinforcing fiber filaments having a bundle interior and a bundle outer side, a first resin composition, and a second resin composition. The first resin composition includes at least one urethane resin, H1, produced from a reaction of a bifunctional aromatic epoxy compound based on bisphenol A, an aromatic polyisocyanate, and a polyalkylene glycol; an oxyalkylated bisphenol A resin, H2; and aromatic polyhydroxy ether P1. The filaments are impregnated with and at least partially connected via the first resin composition. The first resin composition is present in a concentration of 0.1 to 4 wt % relative to a total weight of the pre-impregnated yarn. The second resin composition is on the bundle outer side in the form of particles or drops adhering to the filaments, and is in a concentration of 0.5 to 14 wt % relative to the total weight of the pre-impregnated yarn.

主权项

1. A pre-impregnated yarn comprising:
a bundle of reinforcing fiber filaments having a bundle interior and a bundle outer side, a first resin composition comprising:
at least one urethane resin, H1, produced from a reaction of a bifunctional aromatic epoxy compound based on bisphenol A, an aromatic polyisocyanate, and a polyalkylene glycol,an oxyalkylated bisphenol A resin, H2, andaromatic polyhydroxy ether P1, which has an acid value in a range of from 40 to 55 mg KOH/g and an average molecular weight in a range of from 4000 to 5000 g/mol, and a second resin composition; wherein:
the reinforcing fiber filaments are impregnated with the first resin composition infiltrated into the pre-impregnated yarn and the reinforcing fiber filaments are at least partially connected via the first resin composition,a weight ratio of the resin H1 to the resin H2 is in a range of from 1:1 to 15:1;a mixture of the resins H1 and H2 has a viscosity in a range of from 10 to 10,000 Pa·s at ambient temperature;the first resin composition is present in a concentration in a range of from 0.1 to 4 wt % relative to a total weight of the pre-impregnated yarn;the second resin composition is on the bundle outer side in the form of particles or drops adhering to the reinforcing fiber filaments,the second resin composition is solid at ambient temperature; has a melting temperature in a range of from 80 to 150° C., and is present on the bundle outer side in a concentration in a range of from 0.5 to 14 wt % relative to the total weight of the pre-impregnated yarn;at least 40% of a surface of the bundle outer side is free from the second resin composition; andthe bundle interior is free from the second resin composition.