Pultrusion production process for nylon-based fiber reinforced thermo plastics

A production process and thermoplastic technology, applied in the pultrusion production process of nylon-based thermoplastic FRP, can solve the problems of fast polymerization rate, difficulty in pultrusion process, poor storage stability of impregnation solution, etc., and achieve good product performance, good impregnation effect, The effect of saving production cost

Active Publication Date: 2012-07-04
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Pultrusion production process for nylon-based fiber reinforced thermo plastics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 100 parts by weight of caprolactam and 15 parts by weight of nylon 6 with a number average molecular weight of 18,000 are added to the dehydration kettle (shown in 1) through the hopper (shown in 3), and the nitrogen valve (shown in 2) is opened, and the nitrogen bottle (shown in 14 (shown) to empty the air in the dehydration kettle, start the agitator (shown in 4), heat to 190°C, and after nylon 6 dissolves, cool down to 140°C to form a thickening slurry.

[0052] Add 1 part by weight of sodium hydroxide, 0.5 parts by weight of simethicone oil, and 1 part by weight of 500-mesh graphite powder into the above-mentioned thickening solution, start the vacuum pump (shown in 5), and vacuumize to keep the slurry in a boiling state. Dehydration, the temperature is controlled at 140°C, the extracted moisture and a small amount of caprolactam are stored in the reflux buffer tank (shown in 6), after dehydration for 15 minutes, the temperature of the material is lowered to 75°C, an...

Embodiment 2

[0060] Add 100 parts by weight of caprolactam and 10 parts by weight of nylon 66 with a number-average molecular weight of 23,000 to the dehydration kettle through a hopper. After the air in the dehydration kettle is evacuated with nitrogen, start the agitator and heat to 210°C until the nylon 66 is dissolved. Afterwards, the temperature was lowered to 135°C to form a viscosified slurry.

[0061] Add 1 part by weight of sodium hydroxide, 0.5 parts by weight of simethicone, and 1 part by weight of zinc stearate to the above-mentioned thickening solution, start the vacuum pump, keep the slurry in a boiling state for dehydration, and control the temperature at 135°C, after dehydration for 20 minutes, cool the material to 80°C, then discharge the material into the activation tank, the temperature of the activation tank is maintained at 75°C, and keep stirring continuously.

[0062] Toluene diisocyanate is used as the activator, and 0.3 parts by weight of toluene diisocyanate is in...

Embodiment 3

[0069] Add 100 parts by weight of caprolactam and 12 parts by weight of nylon 46 with a number average molecular weight of 23,000 to the dehydration kettle, vent the air in the kettle with nitrogen, start the stirrer, heat to 200°C, and cool down to 200°C after the nylon 46 is completely dissolved. At 130°C, a thickened slurry was formed.

[0070] Add 1 part by weight of potassium hydroxide, 0.5 parts by weight of magnesium stearate, and 0.5 parts by weight of simethicone to the thickening solution, start the vacuum pump, and vacuumize to keep the slurry in a boiling state for dehydration. The temperature is controlled at 130 ° C, dehydration 25 After a few minutes, the temperature of the material was lowered to 80° C., and then the material was discharged into the activation tank through a metering pump. The temperature of the activation tank was maintained at 80° C. and kept stirring.

[0071] Dicyclohexylmethane diisocyanate is used as the activator, and 0.2 parts by weight...

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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; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L77/06C08L77/10C08L79/08C08K13/04C08K7/14C08K7/06C08K7/10C08K7/08B29C70/52
Inventor 李兰杰杨桂生
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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