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Long fiber reinforced thermoplastic composite material wetting mold and wetting process

A technology for strengthening thermoplastic and composite materials, applied in the field of fiber infiltration, can solve the problems of lack of infiltration of fibers, easy damage to the inner wall of the mold, affecting the quality of the masterbatch, etc., so as to avoid material oxidation, save time and labor, and improve the infiltration effect. Effect

Inactive Publication Date: 2019-08-20
山东鼎元致业新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This cleaning process is easy to damage the inner wall of the mold and takes a long time, about 0.5-1 hour
In addition, the key factor of LFT technology is the infiltration of fibers. Only using the fibers to infiltrate through the liquid resin tank may cause part of the fibers to not be infiltrated, resulting in dry yarn phenomenon, which will affect the quality of the masterbatch

Method used

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  • Long fiber reinforced thermoplastic composite material wetting mold and wetting process
  • Long fiber reinforced thermoplastic composite material wetting mold and wetting process
  • Long fiber reinforced thermoplastic composite material wetting mold and wetting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1: the mold structure provided by the present invention.

[0058] A long fiber reinforced thermoplastic composite infiltration mold such as figure 2 , image 3 with Figure 8 As shown, it includes upper pressure roller 1 and its fixed assembly, lower pressure roller 2 and its fixed assembly, mold shell 3, lifting mechanism 4, heating mechanism 5, molten pool transition section 6 and connecting flange 7;

[0059] The mold shell 3 includes a mold side wall 31, a mold upper cover plate 32 and a mold lower cover plate 33;

[0060] The upper pressing roller and the lower pressing roller are arranged parallel to each other and at intervals;

[0061] The lower pressure roller 2 is a static pressure roller, and the lower pressure roller is fixed on the side wall of the mold through a fixing assembly;

[0062] The upper pressure roller 4 is a dynamic pressure roller, and the upper pressure roller is connected with the lifting mechanism through a fixed assembly, a...

Embodiment 2

[0085] Example 2: An infiltration process for long fiber reinforced thermoplastic composites

[0086] The present invention also provides a long-fiber-reinforced thermoplastic composite material infiltration process, using the mold provided by the present invention, comprising the following steps:

[0087] Step 1, opening the mold, passing the fiber through the yarn inlet hole and the yarn outlet hole of the mould;

[0088] Step 2: Close the mold, turn on the electric heater, and heat the mold to a specified temperature, which is at least equal to or higher than the melting temperature of the resin used; adjust the lifting mechanism of the upper pressing roller to lower the upper pressing roller, so that the fibers are pressed on the upper pressing roller. A uniform wave shape is formed between the roller and the lower pressure roller; the greater the wave amplitude, the greater the tension on the fiber and the better the fiber impregnation effect. However, excessive tension ...

Embodiment 3

[0097] Example 3: A glass fiber reinforced polypropylene composite material was prepared using the mold and process provided in this application.

[0098] Set the heating temperature to 180°C. Using the mold provided in Example 1 and the process provided in Example 2, a composite material was prepared using glass fiber and polypropylene as raw materials. Except for the infiltration process, other preparation processes were the same as those of traditional composite materials.

[0099] Figure 10 It is a cross-sectional scanning electron microscope photo of glass fiber reinforced polypropylene composite material masterbatch, in which the round material is glass fiber, and the gray part is polypropylene resin. It can be seen from the figure that the glass fibers are evenly distributed in the resin matrix without agglomeration, indicating that the infiltration effect of the fibers is very good.

[0100] The mechanical properties of the prepared glass fiber reinforced polypropyl...

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Abstract

The invention discloses a long fiber reinforced thermoplastic composite material wetting mold and a wetting process. The mold comprises an upper pressing roller, a fixing assembly of the upper pressing roller, a lower pressing roller, a fixing assembly of the lower pressing roller, a mold shell, a lifting mechanism, a heating mechanism, a molten pool transition section and a connecting flange; themold shell comprises a mold sidewall, a mold upper cover plate and a mold lower cover plate; the upper pressing roller and the lower pressing roller are parallel and spaced apart from each other; andthe upper pressing roller and the lower pressing roller are both provided with through holes allowing resin to flow out. The upper pressing roller capable of lifting is combined with the fixed lowerpressing roller, resin overflow holes for the resin are formed in the contact faces of the upper and lower pressing rollers and fibers, continuous and even adding is carried out through the resin overflow holes in the pressing rollers, and the fiber wetting efficiency and effect can be improved. Through the design of the mold lower cover plate, under the condition that a mold upper cover does notneed to be opened, the resin left inside the mold can be quickly and cleanly removed, and the production efficiency of the fiber reinforced thermoplastic composite material is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of fiber infiltration, in particular to a long fiber reinforced thermoplastic composite material infiltration mold and an infiltration process. Background technique [0002] Internationally, the production of long fiber reinforced thermoplastic composites (LFT) usually adopts fiber infiltration technology. The implementation process of this technology is: first, the fiber bundle is stretched through a mold filled with liquid resin, and the fiber is dispersed in the mold through a tensioning mechanism. , while being infiltrated with resin; then, the fiber bundle impregnated with resin is pulled out of the mold for air cooling and water cooling, and after cooling, a continuous thin rod of composite material is obtained; finally, the long fiber reinforced thermoplastic composite is obtained by cutting and granulating with a cutting machine Material masterbatch. The core technology of this preparation process i...

Claims

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Application Information

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IPC IPC(8): B29B11/10B29B11/16B29B9/06
CPCB29B9/06B29B11/10B29B11/16
Inventor 白树林郭志山袁灿耀
Owner 山东鼎元致业新材料有限公司
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