Continuous fiber reinforced thermoplastic flame retardant prepreg tape composite material and preparation method thereof

[0043] Example 1

[0044] The resin is prepared in parts by weight of the following raw materials:

[0045] PP 65

[0046] Decabromodiphenylethane 24

[0047] Sb 2 O 3 8

[0048] PP-g-MAH 3

[0049] Glass beads 5

[0050] Antioxidant 1010 0.4

[0051] Antioxidant 168 0.2

[0052] Light stabilizer 3346 0.3

[0053] Light stabilizer 3853S 0.3

[0054] Magnesium stearate 1.2

[0055] Such as figure 1 As shown, the thermoplastic, flame retardant, grafting agent, glass microbeads, and auxiliary additives are uniformly mixed by a high-mixer and then extruded and pelletized in a twin-screw extruder for use (accounting for the total amount of the prepreg 45%). The fiber treated with sizing agent (accounting for 55% of the total prepreg tape) is introduced into the fiber spreading system through the textile creel, and the system tension is adjusted by the tension adjustment system to make each fiber bundle evenly stressed, so as to get smooth Prepreg tape. The flat prepreg belt passes through a spreading unit, and the fibers are initially dispersed and then passed through the soaking water tank. The water passing time of the fiber is adjusted according to the production process. After the water has passed, the fiber passes through the second spreading unit and passes through different rollers in the adjustment system. The difference between the speeds to effectively disperse the fibers can expand the fiber bundle with the original width of 3mm to 6-7mm. The fiber tape with uniform force is pre-heated by the infrared heating device. The heating temperature is not higher than 200℃ and the time is not more than 10s to ensure that the sizing agent on the fiber does not volatilize and reduce the temperature difference between the resin and the fiber tape. Improve the interface bonding force between resin and fiber. The resin granulated by melt extrusion is melted and extruded in a twin-screw extruder, and fed to a rotatable staggered double extrusion die to obtain a uniform coating. The continuous fiber belt passes through the middle of the rotatable dual extrusion die, and is covered by the resin film on both sides and is subjected to a certain tension at the die lip of the die to realize the pre-impregnation of the fiber belt by the resin. The composite roll is completely immersed after rolling. In the production process, the temperature of the composite roller should be controlled properly. Too low temperature will cause the resin to cool too quickly and it is not conducive to the resin's infiltration of the fiber; too high temperature will cause the resin to stick to the roller and reduce the quality of the prepreg tape. The rough prepreg tape obtained by pre-rolling passes through the infrared heating channel again, and the rough prepreg tape softened by heating is again impregnated by roller pressing. After rolling, the prepreg tape is cooled and shaped, and the prepreg tape with a predetermined width is obtained by traction and cutting, and the prepreg tape is wound and packaged according to the predetermined length or weight.

[0056] The performance of the obtained product is as follows:

[0057]

[0058]

[0059] Examples 2~4

[0060] According to the process route of Example 1, the raw material ratio is configured according to the following parts by weight:

[0061]

[0062] The performance of the obtained product is as follows:

[0063]

[0064] Example 5

[0065] A method for preparing continuous fiber reinforced thermoplastic flame-retardant prepreg tape composite material, the method includes the following steps:

[0066] (1) Preparation of modified resin, prepare raw materials according to the following components and parts by weight:

[0067] Polyethylene 55,

[0068] Decabromodiphenylethane 35,

[0069] The weight ratio of antimony trioxide is 5,

[0070] Polypropylene grafted maleic anhydride (PP-g-MAH) 3,

[0071] Glass beads with a particle size of 2~130μm and a true density of 0.25~0.6g/cm3 8.

[0072] Antioxidant 1010 0.1

[0073] Antioxidant 168 0.2,

[0074] Commonly used commercially available light stabilizer 0.6,

[0075] Ethylene bisstearamide 1;

[0076] The above raw materials are uniformly mixed in a high mixer and then extruded and pelletized in a twin-screw extruder to obtain the modified resin;

[0077] (2) Weigh the modified resin prepared in step (1) at 45% by weight and 55% by weight of continuous fibers; the continuous fibers that have been infiltrated with sizing agent ethylene glycol for 2 minutes are introduced into the fiber spreading system through a textile creel, and subjected to tension The adjustment system performs system tension adjustment to obtain a flat prepreg tape. After the prepreg tape is initially dispersed through the first spreading unit, it passes through the soaking water tank and then passes through the second spreading unit for further dispersion;

[0078] (3) The dispersed fiber is preheated by an infrared heating system, the preheating temperature is 180°C, and the preheating time is 10s;

[0079] (4) Melt and extrude the modified resin in a twin-screw extruder, and then uniformly coat the film at the rotatable double-extrusion die to obtain a uniform thermoplastic resin film;

[0080] (5) Wrap the uniform thermoplastic resin film obtained in step (4) on both sides of the continuous dispersed fiber after step (3) infrared heating, and bond them together under the action of a composite roller to obtain a coarse prepreg tape. After heating at 180°C for 10s, the second rolling is performed;

[0081] (6) Finally, the product is obtained through cooling, shaping, traction, and cutting into continuous sheets.