Pultrusion production process for nylon-based fiber reinforced thermo plastics

Abstract

The invention belongs to the technical field of composite materials and discloses a pultrusion production process for nylon-based fiber reinforced thermo plastics. The production process comprises the following steps of: dissolving a tackifier in a lactam monomer at the temperature of between 110 and 210DEG C in a dehydration kettle to obtain tackified slurry; adding a catalyst and a lubricating agent into the tackified slurry, performing vacuum dehydration at the temperature of between 110 and 190DEG C for 5 to 60 minutes, reducing temperature to 70-100DEG C, discharging the material into an activating tank, keeping the temperature of the activating tank between 70 and 100DEG C, and maintaining a stirring state; adding an activator into the activating tank through a metering pump to obtain activated slurry; arranging fibers by using a yarn guide screen board, impregnating the fibers by using the obtained activated slurry, making the impregnated fibers form bundles by using a pre-land plate, dragging into a curing and shaping mold for curing, feeding into a postcuring oven, and dragging and cutting to obtain a fiber reinforced thermo plastic product. The production process has the advantage of low cost.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a pultrusion production process of nylon-based thermoplastic FRP. Background technique [0002] The pultrusion molding process is to form and solidify continuous glass fiber bundles, tapes or cloth impregnated with resin glue through extrusion dies under the action of traction, and continuously produce FRP profiles of unlimited length. This process is most suitable for the production of FRP profiles of various cross-sectional shapes, such as rods, tubes, solid profiles (I-shaped, trough-shaped, square profiles) and hollow profiles (door and window profiles, blades, etc.). [0003] Pultrusion molding is a special process in the composite material molding process. Its advantages are: ①The production process is fully automated and the production efficiency is high; , can give full play to the role of reinforcing materials, and the product has high strength; ...

AI Technical Summary

Problems solved by technology

[0013] The use of anionic ring-opening polymerization of lactam to produce cast nylon has been very mature in industrial production. Although lactam is suitable for pultrusion process in terms of polymerization speed, because the anionic ring-opening polymerization of lactam is extremely sensitive to water, and adding activation The polymerization rate is very fast after dosing, resulting in poor storage stability of the impregnation solution, which is very difficult to implement in the pultrusion process

If the anionic ring-opening polymerization of lactam is to be applied to the pultrusion process to produce FRP products, it is necessary to strictly control each link. At present, there is no relevant report on the production process of nylon-based thermoplastic FRP using the reactive pultrusion process.

Images