Patent Application
20140186609
1. Technical Field
The present disclosure relates to composites, especially to a fiber-and-plastic composite and a method for making the composite.
2. Description of the Related Art
Fiber prepreg cloth consists of fiber and uncured resin, with the fiber soaking in the uncured resin. The fiber prepreg cloths possess the advantages of being light-weight, high strength, and have high resistance to chemical corrosion, and are widely used to fabricate fiber composites using the heating-pressing method. The heating-pressing method includes the following steps: trimming the fiber prepreg cloth to a desired shape; positioning the trimmed fiber prepreg cloth in a mold; pressing and heating the cloth in the mold; and cooling the fiber composite in the mold.
The fiber composite can only have two-dimensional structure, and cannot integrally form with functional parts (such as buckle, stud, for example) during the molding process. Therefore, the functional parts need to be coupled to the fiber composite with adhesive. However, the bond between the fiber composite and the functional parts is not strong enough due to the limitations of the adhesive.
Therefore, there is room for improvement within the art.
Many aspects of the embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the disclosure. Moreover, in the drawings like reference numerals designate corresponding parts throughout the several views. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like elements of an embodiment.
The fiber-and-plastic composite 10 further includes a silane coupling agent layer 15 and an adhesive layer 17 formed between the fiber composite 11 and the plastic parts 13. The silane coupling agent layer 15 directly bonds with the fiber composite 11. The adhesive layer 17 directly bonds with the plastic parts 13. The silane coupling agent layer 15 contains hydrolytic silane coupling agent. The adhesive layer 17 mainly contains one-component polyurethane.
The adhesive layer 17 may further contain an emulsifier and a pH regulating agent.
The drawing force between the fiber composite 11 and the plastic parts 13 are 3.28 Mpa. While the conventional fiber composite which does not include silane coupling agent layer has a drawing force between the fiber composite and the plastic parts of 2.64 Mpa. This shows that the fiber composite 11 and the plastic parts 13 of the fiber-and-plastic composite 10 bonds firmer than the conventional fiber composite without the silane coupling agent.
A fiber prepreg cloth 20 containing fiber and uncured epoxy resin is provided. The fiber can be carbon fiber, glass fiber, or polyamide fiber.
The fiber prepreg cloth 20 is corona discharged by high-frequency alternating current. The high-frequency alternating current makes gas around the fiber prepreg cloth 20 to generate low-temperature plasma. The low-temperature plasma actuates the epoxy resin molecules on the surface of the fiber prepreg cloth 20 to rearrange and generate more polar positions. As a result, the property of the fiber prepreg cloth 20 for adhering is effectively improved. The voltage of the high-frequency alternating current is about 5000 V/m2 to about 15000 V/m2, and the frequency of the high-frequency alternating current is about 15 kHZ to 24 kHZ.
A solution containing silane coupling agent is coated on the surface of the fiber prepreg cloth 20 and is dried to form a silane coupling agent layer 15. The drying of the solution may be carried out at a temperature of about 80° C. to about 120° C. for about 15 min to about 60 min. The solution containing silane coupling agent is made by the following steps: mixing the silane coupling agent and an organic solvent to obtain a mixture, the weight ratio of the silane coupling agent to the organic solvent is 3˜5:95˜97; adding deionized water to the mixture, the weight of the deionized water is about 3%˜5% of the weight of the silane coupling agent. The organic solvent can be but not limited to alcohol. Hydroxyl groups of the epoxy resin and the hydroxyl groups generating from the hydrolytic silane coupling agent dehydrate and chemically bond together, and the other hydroxyl groups of the hydrolytic silane coupling agent distributes on the surface of the fiber prepreg cloth 20. Thus, the activity of the fiber prepreg cloth 20 is improved.
An adhesive is coated on the surface of the silane coupling agent 15 to form an adhesive layer 17. The adhesive mainly contains one-component polyurethane. The adhesive may further contain an emulsifier, a diluent, and a pH regulating agent. The adhesive generally contains solids in an amount of 40% to 60% by weight.
Amino groups of the adhesive and the hydroxyl groups generating from the hydrolytic silane coupling agent dehydrate and chemically bond together. Thus, the silane coupling agent layer 15 and the adhesive layer 17 can bond together firmly.
The one-component polyurethane of the adhesive contains isocyanicacid end groups (—NCO), which can penetrate the silane coupling agent layer 15 and react with hydroxyl groups of the epoxy resin of the fiber prepreg cloth 20.
As shown in
It is to be understood that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of assemblies and functions of various embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2012105883810 | Dec 2012 | CN | national |
