Method for preparing polycondensation reaction type reinforced thermoplastic resin in long fibres

A technology to enhance thermoplasticity and polycondensation reaction, which is applied in the preparation of polycondensation reaction type long fiber reinforced thermoplastic resin and the field of long fiber reinforced thermoplastic resin to achieve the effects of saving production cost, fast infiltration speed, and reducing drying of slices

Active Publication Date: 2006-12-06
SINOPEC YIZHENG CHEM FIBER
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This method can produce long-fiber-reinforced thermoplastic resin-based composites with a good degree of bonding, ...

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  • Method for preparing polycondensation reaction type reinforced thermoplastic resin in long fibres
  • Method for preparing polycondensation reaction type reinforced thermoplastic resin in long fibres

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Embodiment Construction

[0028] The traditional method of preparing long fiber reinforced thermoplastic resin (LFRTP resin) is to use high molecular weight PET and other polymers as raw materials, use twin-screw extruder to obtain polymer melt, and then perform fiber impregnation. The present invention adopts an integrated process of esterification (ester exchange), polycondensation, impregnation, cooling, and granulation, impregnating fiber bundles with low-molecular-weight condensation polymers, cooling and pelletizing to obtain prepreg slices, and then performing solid-state polycondensation to obtain High molecular weight LFRTP resin.

[0029] Such as figure 1 As shown, the present invention first passes the reaction raw materials through esterification reaction or transesterification reaction to form a condensation system capable of condensation reaction; then change the reaction conditions to make the condensation system undergo a melt polycondensation reaction to generate a low-viscosity polyco...

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Abstract

This invention relates to a method for manufacturing long-fiber-reinforced thermoplastic resin by condensation polymerization. The method comprises: (1) performing esterification or interesterification on the raw material to form esterified material; (2) performing melt-condensation polymerization to obtain low-viscosity condensation polymer, and introducing the molten condensation polymer into a dip tank; (3) preheating fiber bundles, and passing through the inside of the dip tank so that the molten condensation polymer adhere to the surface of the fibers to form predipped material; (4) cooling and cutting to obtain low-viscosity chips; (5) performing solid phase condensation polymerization to obtain the final product. The method can integrate esterification (interesterification), condensation polymerization, dipping and solid phase condensation polymerization, thus can utilize present equipment to manufacture long-fiber-reinforced thermoplastic resin, such as PET, PTT, PBT and PEN.

Description

technical field [0001] The invention relates to the preparation of long fiber reinforced composite materials, in particular to the preparation of long fiber reinforced thermoplastic resins, in particular to a preparation method of polycondensation reaction type long fiber reinforced thermoplastic resins, belonging to the technical field of polymer material synthesis and processing. Background technique [0002] Since R.Bradit first used glass fiber reinforced polystyrene to make composite materials in 1951, people have continued to study the matrix resin, reinforcing materials and molding methods of fiber reinforced thermoplastic composites (FRTP). Many advantages of this material, such as high toughness, good impact resistance, not limited by storage time, short manufacturing cycle, stable prepreg, good chemical resistance, low moisture absorption, repeatable processing, etc., have been recognized by people. And utilization, its output and application fields are expanding c...

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Application Information

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IPC IPC(8): C08L67/03C08G63/80C08J5/04C08K5/5419
Inventor 余木火姜润喜成展韩克清吴鹏阎伟霞王恒周洪梅
Owner SINOPEC YIZHENG CHEM FIBER
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