JP3187692B2 - Reinforcing material and resin molding using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing material and a resin molding used for, for example, a molding material for a rear or a front of an automobile, a glass run for a door, a window frame beat material for a general building, and the like.

[0002]

2. Description of the Related Art Conventionally, a metal wire has been buried in a resin molding for the purpose of suppressing the phenomenon of expansion and contraction of the resin molding due to a temperature change. In this manufacturing process, first, a metal wire is inserted into an adhesive application device, a commercially available adhesive is adhered to an outer peripheral portion, and the wire is introduced into an extruder to extrude and coat a resin. Applicants have:
In order to improve the manufacturing process of this resin molded product, a reinforcing material was previously developed by applying and fusing a heat-sealing varnish to a core material such as a metal wire, and it was proposed to apply this to a resin molded product (actual application). Cf. Hei 3-67562). According to the invention,
There is no need to install an adhesive application device in front of the extrusion device,
If a reinforcing material having a fusion layer is simply inserted into the extruder, the fusion layer is melted by the heat of the resin at the time of extrusion, and the fusion layer adheres the core material and the resin as it is further cooled.

[0003]

In order to suppress the shrinkage of the resin molded product, a core material having a resilience, in other words, a material having a high tensile strength is desired. Therefore, a metal wire such as brass has conventionally been used as a core material.
As the tensile strength of the metal wire is higher, the wire diameter can be reduced, so that the number of buried portions can be increased in order to improve the strength of the resin molded body. The reinforcing material has an effect of not only preventing the resin molded product from shrinking, but also improving the extrudability and positioning accuracy during molding. Also in this case, a core material having higher tensile strength has been desired.

[0004] In view of the above, an object of the present invention is to provide a reinforcing material and a resin molded product using a core material having higher tensile strength than conventional ones.

[0005]

A reinforcing material according to the present invention comprises a metal wire having a circular cross section made of iron or an alloy thereof, and a brass plating layer or a zinc plating layer provided on the surface of the metal wire. The point is that a fusion layer formed by applying and baking a heat fusion varnish is provided immediately above the core wire composed of

According to a second aspect of the present invention, there is provided a resin molded product comprising a metal wire having a circular cross section made of iron or an alloy thereof and a brass plating layer or a zinc plating layer provided on the surface of the metal wire. The gist is that a resin layer is provided on the outer periphery of a reinforcing material having a fusion layer obtained by applying and baking a thermal fusion varnish directly or via another layer directly above.

Hereinafter, each configuration of the present invention will be described in more detail. The metal wire of the present invention is not particularly limited, but is preferably a metal having a tensile strength of 400 N / mm ² or more, for example, iron and an alloy thereof. Of these metallic materials, iron or iron alloys are particularly preferred in that they are low in cost, have excellent drawability, and have higher tensile strength than brass, but iron or iron alloys are oxidized in air. Easy to embrittle. Therefore, since oxidation is prevented by providing a fusion layer after plating on iron or iron alloy, iron or iron alloy can be said to be the most suitable metal wire in the present invention. As the shape of the metal wire made of the above-described material, a shape having a circular cross section or a shape obtained by combining a plurality of wires having a circular cross section is preferable. The metal wire having such a shape does not have directionality as compared with other cross-sectional shapes, is easily thinned, and has good moldability. In particular, in the latter case of a stranded wire using a wire having tensile strength, it has not only tensile strength but also excellent flexibility. In addition, the present invention includes, for example, roughening the outer peripheral surface of the metal wire or processing the metal wire into a wavy shape in the longitudinal direction in order to improve the adhesiveness with the resin layer to be coated.

[0008] The plating layer provided on the metal wire as described above is applied by a known plating method, and is not particularly limited. Among them, brass plating and zinc plating are excellent in rust prevention effect, It is particularly preferable because the adhesion to the adhesion layer is not impaired.

The heat-sealing varnish used in the present invention refers to a varnish-like resin in which a solvent and other additives are blended with a thermoplastic resin to adjust the viscosity and the like. This is applied to a metal wire and then heated to bake until a semi-cured state while volatilizing the solvent in the heat fusion varnish to form a fusion layer. The fusion layer has no tackiness at room temperature, but has the property of being dissolved and crosslinked or cured when reheated.

The heat-sealing varnish has the following properties: the adhesiveness between the resin to be coated and the plating layer; the extrusion temperature of the resin (namely, the fusion temperature);
An appropriate one is selected according to various conditions such as a use environment, workability of coating and baking, and uniformity of a fusion layer. For example, when the resin layer is a polyvinyl chloride resin or a nylon resin, a heat sealing varnish containing a polyester resin as a main component is used,
When the resin layer is a resin having a relatively small number of polar groups such as a polyolefin-based resin, a heat-melting resin obtained by mixing a polyester resin having 3 to 50 hydroxyl groups in one molecule with a diisocyanate compound and / or a triisocyanate compound is used. A heat-sealing varnish using a polar varnish or a polar polymer obtained by grafting a small amount of maleic anhydride to a polyolefin is preferable, and when a heat-resistant resin such as ABS / PVC alloy is used as a resin layer, the heat-resistant varnish is also preferable. It is preferable to use a heat-sealing varnish obtained by mixing a polyester resin having a softening temperature of 90 ° C. or higher with a diisocyanate compound and / or a triisocyanate compound. The resin constituting the main component of the heat fusion varnish is dissolved in an organic solvent to prepare a heat fusion varnish. As the organic solvent, a high-boiling solvent such as cresol, N-methyl-2-pyrrolidone (NMP), dimethylacetamide (DMAC), or naphtha has a low volatilization uniformity between application of a fusion varnish and baking. This is preferable in that a suitable fused layer can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the reinforcing material and the resin molded product of the present invention will be described below. FIG. 1 is a sectional perspective view of an automobile window molding 1 which is an example of a resin molding.
The window molding 1 is formed from a resin layer 2 entirely made of polyvinyl chloride resin. In the resin layer 2, a reinforcing material 3 provided with a fusion layer formed by applying and baking a heat fusion varnish mainly composed of a polyester resin to the outer periphery of an iron wire having a plating layer is embedded. Thereby, the resin layer 2 and the iron wire are bonded. The reinforcing material 3 has a function of suppressing the contraction / expansion of the window molding 1 in the longitudinal direction. Further, a plurality of reinforcing materials can be embedded in the resin molded body.

[0012]

【Example】

[Examples 1 and 2] An outer periphery of an iron wire having a diameter of 0.25 mm is plated with a thickness of 2 to 3 μm as shown in the table. A fusion layer was formed to form a reinforcing material.

Example 3 A zinc layer having a thickness of 2 to 3 μm was formed on the outer periphery of an iron wire having a diameter of 0.08 mm to form a plating layer. Seven strands of this wire were immersed in a polyester heat fusion varnish and baked to a semi-cured state to form a fusion layer, thereby forming a reinforcing material.

[Comparative Example 1] A polyester-based heat-sealing varnish was applied to the outer periphery of a brass wire having a diameter of 0.25 mm, and baked to a semi-cured state to form a fusible layer, thereby forming a reinforcing material.

For the reinforcing materials of Examples 1 to 3 and Comparative Example 1 as described above, tensile strength (according to JIS C30025) and flexibility SEN (JIS C3003 21)
(According to (1)).

[0016]

[Table 1]

From the results shown in Table 1, it can be seen that in the examples of the present invention, the provision of the plating layer enabled the use of an iron wire having a higher tensile strength than brass as a reinforcing material. Further, in the case of a stranded wire, the flexibility is improved, so that the flexibility of the resin molded body in which the wire is embedded is also improved.

[0018]

The reinforcing material of the present invention does not have tackiness at room temperature, but exhibits excellent adhesiveness when reheated to about the resin processing temperature. In addition, since a heat-sealing varnish is used, it is possible to obtain a fused layer having a more uniform coating thickness than an adhesive layer made of an adhesive or a hot-melt adhesive. In the present invention, since a brass plating layer or a zinc plating layer is provided on a metal wire having a circular cross section made of iron or an alloy thereof,
A reinforcing material having high tensile strength and excellent adhesiveness to resin can be obtained. The resin molded body in which such a reinforcing material is embedded suppresses shrinkage and expansion due to temperature changes, etc., and also improves the positioning accuracy in the longitudinal direction of the resin molded body when molding the resin layer, eliminating the need for annealing after molding. It can be.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 ... window molding for automobiles 2 ... resin layer 3 ... reinforcing material

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyuki Nishi 1-8-8 Kameido, Koto-ku, Tokyo Inside Japan Ply Co., Ltd. (56) References Japanese Utility Model No. 5-16268 (JP, U) Japanese Patent Publication Sho 62 -16807 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E06B 3/62 B60R 13/02-13/04 B29C 47/02

Claims (2)

(57) [Claims] 1. A hot-melt wire directly above a core wire made of a metal wire having a circular cross section made of iron or its alloy and a brass plating layer or a zinc plating layer provided on the surface of the metal wire. A reinforcing material provided with a fusion layer obtained by applying and baking a coating varnish. 2. A hot-melt metal wire made of iron or its alloy and having a circular cross section and a brass plating layer or a galvanizing layer provided on the surface of the metal wire. A resin molded article, characterized in that a resin layer is provided on an outer periphery of a reinforcing material having a fusion layer obtained by applying and baking a coating varnish.