Molding method of long fiber reinforced thermoplastic resin

A technology of reinforced resin and molding method, which is applied in the molding field of long fiber reinforced thermoplastic resin, which can solve the problems of production interruption, fiber dispersion, and high resin viscosity requirements, and achieve the effect of expanding the molding range and wide application range

Active Publication Date: 2015-07-29
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these molding methods mainly include: 1) Due to the short residence time of the fibers in the machine head, the dispersion and impregnation of the fibers are not ideal, and the fibers are easy to be broken if the residence time is too long; 2) The resin viscosity is high, and generally The flow index of the thermoplastic resin is required to be 50-100g / 10min or above. The high viscosity of the resin will result in poor impregnation effect, and it will easily lead to fiber bundle breakage and filament breakage, resulting in production interruption; 3) It is not suitable for the preparation of reinforced heat-sensitive resins, such as poly Formaldehyde, because the impregnation head of this molding method is easy to accumulate too much resin, and the heating time is too long, which will easily lead to the decomposition of heat-sensitive resin; 4) This molding method is only suitable for the preparation of long glass fiber reinforced thermoplastic resin reinforced particles, but not for molding products

Method used

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  • Molding method of long fiber reinforced thermoplastic resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Feed the long glass fiber bundles through the fiber feeding port (2) of the barrel, the fiber feeding port (2) is located directly above the barrel, and the distance from the screw outlet is 6D (D is the diameter of the screw), and the long glass fiber The bundle is brought into the screw under the rotation of the twin-screw extruder (3), and the thermoplastic resin polypropylene (melt flow index is 3.2g / 10min) is fed through the hopper (5) and melted and plasticized by the screw , the long glass fiber bundles are cut into 20mm under the gentle shearing action of the screw, and mixed evenly with the thermoplastic resin polypropylene, and finally molded by the sheet mold element (6) to obtain a long glass fiber reinforced polypropylene sheet; wherein, the continuous The screw element after the long fiber is fed is a double-head conveying element with a lead of 2D. The temperature settings of the extruder are respectively set from the feeding port to the outlet: 170°C-190...

Embodiment 2

[0023] Feed the long glass fiber bundles through the fiber feeding port (2) of the barrel, the fiber feeding port (2) is located directly above the barrel, and the distance from the screw outlet is 7D (D is the diameter of the screw), the long glass fiber The beam is brought into the screw under the rotation of the twin-screw extruder (3), and the thermoplastic resin polypropylene (melt flow index is 50g / 10min) is fed through the hopper (5) and melted and plasticized by the screw, The long glass fiber bundles are cut into 30 mm under the gentle shearing action of the screw, and mixed evenly with the thermoplastic resin polypropylene, and finally molded by the granulation mold element (6) to obtain long glass fiber reinforced polypropylene particles; wherein, the long glass fiber bundles The screw element after the glass fiber is fed is a double-head conveying element with a lead of 1.6D. The temperature settings of the extruder are respectively set from the feeding port to the...

Embodiment 3

[0027] Feed the long glass fiber bundles through the fiber feeding port (2) of the machine barrel, the fiber feeding port (2) is located directly above the machine barrel, and the distance from the screw outlet is 6.5D (D is the diameter of the screw), and the long glass fiber The fiber bundle is brought into the screw under the rotation of the twin-screw extruder (3), and the thermoplastic resin polyoxymethylene (melt flow index is 9.7g / 10min) is fed through the hopper (5) and melted by the screw. The long glass fiber bundle is cut into 28mm under the gentle shearing action of the screw rod, and mixed evenly with the thermoplastic resin polyoxymethylene, and finally molded by the plate mold element (6) to make a long glass fiber reinforced polyoxymethylene sheet; wherein, The screw element after the long glass fiber is fed is a double-head conveying element with a lead of 1.5D. The temperature settings of the extruder are respectively set from the feeding port to the outlet: ...

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Abstract

The invention discloses a method for molding a long fiber-reinforced thermoplastic resin. The method comprises the following steps of feeding long fiber bundles into a screw extruder from a fiber feeding mouth located at a cylinder of the screw extruder, feeding a resin into the screw extruder from a hopper, uniformly mixing the long fiber bundles and the resin under the action of rotation of a screw of the screw extruder, and carrying out molding by a mold to obtain the long fiber-reinforced thermoplastic resin. Through compounding of the long fiber bundles and the thermoplastic resin in the screw extruder, the method realizes full dispersion and dipping of long glass fibers, does not have special requirements on resin viscosity, has a wide application range and is suitable for a thermally sensitive resin.

Description

technical field [0001] The invention relates to a molding method of long fiber reinforced thermoplastic resin. Background technique [0002] Long glass fiber reinforced thermoplastic resin refers to the reinforced resin whose fiber length is greater than 3mm. The resin is evenly distributed between the fibers to form a continuous phase to fix the spatial position of the fibers and transmit the load inside the material. Compared with ordinary short glass fiber reinforced thermoplastic resins, it has more outstanding mechanical properties, heat resistance, warpage resistance, dimensional stability, etc., so it can manufacture products with excellent mechanical properties, such as auto parts, electronics, etc. Devices, chemical machinery parts, etc. [0003] There have been some disclosed molding methods for preparing continuous long glass fiber reinforced thermoplastic resins, such as CN101152767A, CN1017693B, CN103769 and so on. The common feature of these molding methods i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/52B29C70/16
Inventor 贾明印王亮亮于建傅送保陈步宁徐建波王洪波陈科宇刘慧宏
Owner CHINA NAT OFFSHORE OIL CORP
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