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Partially divided fiber bundle, method for producing same, chopped fiber bundle and fiber-reinforced resin molding material using same

A manufacturing method and chopped fiber technology, which is applied in fiber processing, conveying filamentous materials, thin material processing, etc., can solve the problem that it is difficult to obtain fiber bundles, and it is impossible to control the length of the fiber separation processing section and the non-fiber processing section and other issues to achieve the effect of good liquidity

Active Publication Date: 2021-10-26
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the peripheral speed of the roller and the conveying speed of the fiber bundle are basically the same speed synchronously, so it is impossible to control the lengths of the fiber-splitting treatment section and the non-fiber-splitting treatment section, etc., and it is difficult to obtain the optimal form of partial fiber splitting. fiber bundle

Method used

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  • Partially divided fiber bundle, method for producing same, chopped fiber bundle and fiber-reinforced resin molding material using same
  • Partially divided fiber bundle, method for producing same, chopped fiber bundle and fiber-reinforced resin molding material using same
  • Partially divided fiber bundle, method for producing same, chopped fiber bundle and fiber-reinforced resin molding material using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0214] The fiber bundle [A-1] is unwound at a constant speed of 10 m / min using a winder, passed through a vibrating widening roll vibrating in the axial direction at 10 Hz, and subjected to widening treatment, and then restricted from a width of 50 mm. Rolls are passed, thereby obtaining a widened fiber bundle widened to 50 mm.

[0215]Unwind the obtained widened fiber bundle at a constant speed of 5 m / min, and continuously immerse it in the sizing agent treatment solution (obtained by diluting the sizing agent [S-1] with purified water), and apply the sizing agent once Then, the widened fiber bundle coated with the primary sizing agent was supplied to a hot roll at 150° C. and a drying oven at 200° C. (in the air atmosphere), and dried to remove water. Based on the above-mentioned measuring method of the adhesion amount of the sizing agent or the water-soluble polyamide, the obtained widened fiber bundle after the primary application of the sizing agent was calculated, and it...

Embodiment 2

[0223] Production and evaluation were performed in the same manner as in Example 1, except that the coating resin [P-1] adhesion amount was 0.5 wt%. When a 1500m partially split fiber bundle is produced, there is no breakage or entanglement once, and when the fiber splitting mechanism is inserted and inserted, the twisting of the fibers existing in the fiber bundle passes along the traveling direction, and can be performed at a stable width. Fiber separation treatment, process passability is ○ (good). The number of fibers per unit width of the obtained partially divided fiber bundle was 1111 / mm, and the drape value D1 was 153 mm. In addition, the flexural strength was 431 MPa, the CV of the flexural strength was 7.6%, the flexural modulus was 24.2 GPa, the CV of the flexural modulus was 7.6%, and the flow rate was 241%. Judgment (○: level not problematic in practical use, ×: level problematic in practical use) was ○.

Embodiment 3

[0225] Evaluation was performed in the same manner as in Example 1 except that the coating resin [P-1] adhesion amount was 1 wt%. As a result, when a 1500m partly split fiber bundle was made, no filament breakage or entanglement occurred once, and when the fiber splitting processing mechanism was inserted and inserted, the twisting of the fibers present in the fiber bundle passed along the direction of travel, and it was possible to The width is divided into fibers, and the process passability is ○ (good). The number of fibers per unit width of the obtained partially defibrated fiber bundle was 1020 fibers / mm, and the drape value D1 was 171 mm. In addition, the flexural strength was 407 MPa, the CV of the flexural strength was 7.7%, the flexural modulus was 24.3 GPa, the CV of the flexural modulus was 6.7%, and the flow rate was 243%. Judgment (○: level not problematic in practical use, ×: level problematic in practical use) was ○.

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Abstract

Partially divided fiber bundles, chopped fiber bundles using them, and fiber-reinforced resin molding materials alternately form divided fibers split into multiple bundles along the length direction of the reinforcing fiber bundle formed of a plurality of monofilaments A sizing agent containing at least a polyamide-based resin is attached to the surface of the reinforcing fibers in the partially divided fiber bundles formed between the treated section and the unseparated section, and the number of fibers per unit width contained in the reinforcing fiber bundles is 600 / mm or more and less than 1600 fibers / mm, and the drape value of the reinforcing fiber bundle is 120 mm or more and 240 mm or less. In addition, the method for producing a partially-fiberized fiber bundle includes the following steps [A] to [D]: [A] The fiber-dividing step is to advance a fiber bundle formed of a plurality of monofilaments in the longitudinal direction, Inserting a fiber splitting mechanism with a plurality of protruding parts into the fiber bundle to generate a fiber splitting treatment part; [B] intertwining process, forming a monofilament intertwined entanglement at a contact part in contact with the protruding part in at least one fiber splitting treatment part Part; [C] Part of the fiber splitting process, the fiber splitting mechanism is pulled out from the fiber bundle, after passing through the entanglement and accumulation part including the entanglement part, the fiber splitting mechanism is inserted into the fiber bundle again, and the fiber splitting mechanism is alternately formed into The fiber-splitting section and the un-separated section of the plurality of bundles; and [D] a resin impregnation step of imparting water-soluble polyamide to the fiber bundles. To provide a partially divided fiber bundle that not only prevents occurrence of inappropriate reaggregation, but also has excellent process stability such as cutting treatment, and improved productivity.

Description

technical field [0001] The present invention relates to a partially divided fiber bundle and its chopped fiber bundle, a method for producing the same, and a fiber-reinforced resin molding material using the same. A large number of inexpensive large tow fiber bundles are subjected to a specific partial fiber splitting process (the partial fiber splitting process can form a partially fiber split fiber bundle in an optimal form for making molding materials used in composite material molding) Partially divided fiber bundles imparted with water-soluble polyamide and their chopped fiber bundles, their production methods, and fiber-reinforced resin molding materials using them and their production methods were performed at appropriate timing. Background technique [0002] Manufacturing a molded product of a desired shape using a molding material formed of a bundle of discontinuous reinforcing fibers (for example, carbon fibers) (hereinafter, sometimes referred to as a fiber bundle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/59B65H51/005D02J1/18
CPCB65H51/005D02J1/18D06M15/59B29C70/12C08J5/042C08J2377/02B29C70/06C08J3/212C08J5/06C08L77/06C08L2205/025C08L2205/16
Inventor 布施充贵馆山胜平野宏清家聪松井明彦浦和麻本桥哲也
Owner TORAY IND INC
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