JPH09132886A - Reinforcing material and formed resin material using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a reinforcing material excellent in adhering property of its fuse-adhered layer and a formed resin material using the same. SOLUTION: This reinforcing material 3 is used in a window mole 1 formed with a resin layer 2 consisting of a polyvinyl chloride as a whole. In the resin layer 2, the reinforcing material 3 having a fuse-adhered layer having unevenness formed by applying and burning a heat fuse-adhering varnish consisting of a resin blended with a filler of a particle state on the periphery of a metallic wire, is buried, and the resin layer 2 is adhered to the metallic wire by the fuse-adhered layer. The reinforcing material 3 has a function for suppressing the contraction and expansion of the resin layer in its longitudinal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile side protection molding and a rocker panel molding,
Further, the present invention relates to a reinforcing material embedded in a resin molding for a building material such as beet material for a window frame, and a resin molding using the same.

[0002]

2. Description of the Related Art Conventionally, synthetic resins exemplified by polyolefin resins such as vinyl chloride resin, nylon resin and polypropylene resin have been used for automobile side protection moldings and rocker panel moldings. However, the resin moldings produced by molding these synthetic resins alone have low rigidity and are easily affected by the installation environment, and the dimensional stability deteriorates during repeated expansion and contraction due to temperature changes, especially in the longitudinal direction. There was a risk of distortion.

In order to make up for this drawback, a resin molded body in which a synthetic resin is coated on a stainless steel core material formed into a tape or a predetermined shape for molding has been widely used, but the metal portion is large. Therefore, the weight becomes heavy, the cost is high, and it is difficult to process the core material into a predetermined sectional shape.

Therefore, as shown in Japanese Patent Application No. 3-67562, a resin is extruded onto the outer periphery of a shrinkage-preventing material in which a fusion-bonding layer made of a heat-fusion varnish such as polyester is provided on a wire having high tensile strength. A resin molded body has been proposed in which a fusion layer is melted by heat during extrusion to bond a wire and a resin. In such a resin molded product, since the wire rod has high tensile strength and the adhesion between the wire rod and the resin is good, it is known that the dimensional stability of the resin molded product is not deteriorated even when the temperature is changed. Has been.

[0005]

As the shrinkage-preventing material composed of the wire and the fusion-bonding layer is more strongly adhered to the resin, the dimensional stability of the resin molded product is improved. Therefore, the inventors have developed a fusion layer having excellent adhesiveness with various resins (see Japanese Patent Application No. 7-43279). However, it is desired to further improve the adhesiveness.

In view of the above points, the present invention provides a reinforcing material excellent in adhesiveness of the fusion bonding layer and a resin molding using the same.

[0007]

The present invention has the following arrangement. The reinforcing material of the first aspect of the present invention is a reinforcing material in which a metal wire is provided with a fusion bonding layer obtained by applying and baking a heat fusion varnish directly or through another layer, and a concave portion is formed in the surface layer portion of the fusion bonding layer. And / or the provision of the convex portion is the gist.

The metal wire used in the present invention preferably has a high tensile strength, that is, a tensile strength of 400 N / mm ² or more. Specific examples thereof include brass, phosphor bronze, stainless steel, nickel silver and iron. To be Tensile strength is 400N
/ Mm ² or more metal is less likely to be deformed by external force,
Since it has a straightening property, it is suitable as a core material. When a metal wire having a tensile strength of less than 400 N / mm ² is used in the resin molded body, the metal wire may be broken due to contraction and expansion of the resin layer extruded on the fusion layer. Further, those obtained by plating these metals are preferable because they have a high rust preventive effect.
The shape of the metal wire is preferably circular in cross section or a combination of a plurality of wire having circular cross section. The metal wire rod having such a shape has no directionality as compared with other cross-sectional shapes, can be easily thinned, and has good moldability. Particularly, in the latter case of a stranded wire using a wire rod having tensile strength, not only the tensile strength but also excellent flexibility is combined. In addition,
The present invention also includes roughening the outer peripheral surface of the metal wire rod, corrugating the metal wire rod in the longitudinal direction, and the like in order to improve the adhesiveness with the fusion-bonding layer to be coated. In addition, in the resin molded body of the present invention, a single or a plurality of metal wire rods are embedded in one resin molded body.

The heat fusion varnish used in the present invention refers to a varnish resin in which a thermoplastic resin is blended with a solvent and other additives to adjust the viscosity. By applying this to a metal wire and then heating it, the solvent in the heat-sealing varnish is volatilized and baked until it becomes a semi-cured state to form a welding layer. The fusing layer is not tacky at room temperature, but has the property of melting and cross-linking or curing when reheated. Therefore, in the resin molded body of the present invention, the fusion layer is
The resin layer is melted at the extrusion temperature and then cured to bond the metal wire and the resin layer.

The heat fusion varnish has the following properties: adhesiveness with the resin to be coated, resin extrusion temperature (that is, fusion temperature), operating environment,
Appropriate ones are selected according to various conditions such as workability of coating and baking and uniformity of the fusion layer. For example, when the resin layer is polyvinyl chloride resin or nylon resin, a heat fusion varnish containing polyester resin as a main component is used, and when the resin layer is a resin having relatively few polar groups such as polyolefin resin, A heat-sealing varnish prepared by mixing a polyester resin having 3 to 50 hydroxyl groups in one molecule with a diisocyanate compound and / or a triisocyanate compound, or a polar polymer obtained by grafting a small amount of maleic anhydride on polyolefin. The heat fusion varnish used is suitable, and when a heat resistant resin such as ABS / PVC alloy is used as the resin layer, it also has excellent heat resistance,
A heat-bonding 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 is used. When EPDM is used for the resin layer, a metal-based adhesive is applied onto a metal wire. Further, it is preferable to form a double coating layer on which a rubber adhesive is applied. The resin constituting the main component of the heat-sealing varnish is dissolved in an organic solvent to prepare a heat-sealing varnish. As the organic solvent, cresol, N-methyl-
2-pyrrolidone (NMP), dimethylacetamide (D
A high-boiling solvent such as MAC) or naphtha is preferable in that a uniform fusion layer can be obtained with little volatilization between application of the fusion varnish and baking.

The surface layer portion of the fusion-bonding layer of the present invention is provided with concave portions and / or convex portions. The concave portions and / or convex portions increase the adhesive area with the resin layer and improve the adhesive force. The recesses or protrusions preferably have a diameter on the order of several to several tens of μm. As the method of forming the unevenness, a method of providing unevenness on the inner peripheral surface of the die for varnish drawing provided in the coating device of the heat fusion varnish, and a method of adding a particulate filler to the heat fusion varnish. Conceivable. Hereinafter, the latter method will be described in more detail. However, the concavo-convex forming method and the concavo-convex shape are not limited to these.

The filler added to the heat-sealing varnish is difficult to form unevenness when the respective particles are flat, and the filler is dispersed in the heat-sealing varnish when the particles are needle-shaped, which makes it difficult to apply. It is desirable to use substantially spherical particles. The average particle size is preferably 1 to 10 μm. The reason is that when the average particle size is less than 1 μm, the unevenness is too small and the adhesive strength is not significantly improved. The average particle size is 10 μm
If it is larger than the above range, the filler is likely to be detached from the fusion layer, so that the adhesiveness tends to be rather lowered. Fillers satisfying such conditions include aluminum oxide powder, magnesium oxide powder, titanium oxide powder, silicon oxide powder,
Oxide-based inorganic compound powder such as iron oxide powder, complex oxide-based inorganic compound powder such as talc powder, zirconium silicate powder, and non-oxidized silicon nitride powder, silicon carbide powder, aluminum nitride powder, boron nitride powder, etc. Examples include physical substance-based inorganic compound powders. In the present invention, the blending amount of the particulate filler is preferably 1 to 50 parts by weight with respect to 100 parts by weight of the resin component of the heat-sealing varnish. If the blending amount is less than 1 part by weight, the number of concave portions and convex portions formed on the surface of the fusion bonding layer is small, and the adhesive force is not significantly improved. Compounding amount is 50
If it exceeds the weight part, the film of the fusion bonding layer becomes brittle and the adhesive force is rather lowered. To disperse such a filler in the heat-sealing varnish, an appropriate stirrer such as a mixer, a ball mill, a sand mill or the like is used.

Further, in the resin molded product of the present invention, a polyolefin resin is used as the resin layer provided on the outer periphery of the reinforcing material, and when an inorganic filler such as talc is added to this, a thickening effect appears, Adhesion with the fusion layer is improved. In addition, the present invention is effective even when the resin layer is formed into a multi-layer coating by providing another resin layer having different hardness on the outer periphery of the polyolefin resin layer.

The reinforcing material of the present invention is used not only for the purpose of preventing shrinkage of the resin molding and dimensional stability, but also for positioning in the longitudinal direction when the resin is extruded, as in the case of the conventional ad coat wire (trade name of Nippon Ply Co., Ltd.). It is valid. Therefore, the length can be controlled by computer control, and variable extrusion molding can be performed by utilizing this characteristic. Further, when the resin is extruded on the reinforcing material, "dripping" or deformation of the resin is prevented, and the molding accuracy of the resin molded body is improved.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the reinforcing material and resin molding of the present invention will be shown below. FIG. 1 is a cross-sectional perspective view of an automobile window molding 1 which is an example of a resin molded body.
The window molding 1 is entirely formed of a resin layer 2 made of polyvinyl chloride resin. In the resin layer 2, a reinforcing material 3 in which a fusion bonding layer is formed by coating and baking a heat fusion varnish prepared by mixing a polyester resin with a particulate filler on the outer periphery of a brass-plated steel wire is embedded and fused. The resin layer 2 and the steel wire rod are adhered by the layer. This reinforcement 3
Has a function of suppressing 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.

[0016]

An embodiment of the present invention will be described below. [Examples 1 to 3, Comparative Examples 2 to 5] The fillers shown in Table 1 were blended with the polyester varnish, and the mixture was stirred with a mixer to prepare a heat fusion varnish. A brass-plated steel wire having a diameter of 0.25 mm was coated and baked with the above-described heat-sealing varnish 5 times to form a welding layer having concave and convex portions,
It was used as a reinforcing material. Further, the outer periphery of this reinforcing material was extruded and covered with a semi-rigid polyvinyl chloride resin to prepare a resin molded body in which the wire and the resin layer were bonded.

[Comparative Example 1] Similar to the above-mentioned example, a reinforcing material and a resin molded body were prepared by using a heat fusion varnish containing no filler.

In order to test the pulling-out force of Examples and Comparative Examples, resin molded bodies were cut so that the length of the resin layer was 1 cm, and samples were prepared. The metal wire rod in the sample was pulled, and the force when the metal wire rod was pulled out was measured (10 times of measurement).

[0019]

[Table 1]

As a result, Comparative Example 2 having an average particle size of less than 1 μm and Comparative Example 4 having a compounding amount of less than 1 part by weight have the same adhesive strength as Comparative Example 1 containing no filler. It was revealed. Further, it can be seen that Comparative Example 3 having an average particle size of more than 10 μm and Comparative Example 5 having a compounding amount of more than 50 parts by weight have lower adhesive strength than Comparative Example 1 containing no filler.

[Example 4] A steel wire having a diameter of 0.08 mm was plated with zinc having a thickness of several μm, and seven strands were twisted together.
Furthermore, a polyester varnish was applied and baked using a die having an unevenness on the inner peripheral surface to form a fusion layer having a projection of several μm to 20 μm. Further, the outer periphery of this reinforcing material was extruded and covered with a semi-rigid polyvinyl chloride resin to prepare a resin molded body in which the wire and the resin layer were bonded.

[Comparative Example 6] A steel wire having a diameter of 0.08 mm was plated with zinc having a thickness of several μm, and 7 strands were twisted together.
Further, the polyester varnish was applied and baked using a normal die to form a fusion-bonding layer having no irregularities. Further, the outer periphery of this reinforcing material was extruded and covered with a semi-rigid polyvinyl chloride resin to prepare a resin molded body in which the wire and the resin layer were bonded.

In order to test the pulling-out force of Examples and Comparative Examples, the resin moldings were cut so that the length of the resin layer was 1 cm, and samples were prepared. The metal wire rod in the sample was pulled, and the force when it was pulled out was measured.

[0024]

[Table 2]

From the above results, it can be seen that the adhesiveness of Example 4 having the convex portion is better.

[0026]

EFFECTS OF THE INVENTION The reinforcing material of the present invention does not have tackiness at room temperature, but when it is reheated to the processing temperature of the resin, it melts and cures, and exhibits excellent adhesiveness. Further, since the heat fusion varnish is used, it is possible to obtain a fusion bonding layer having a more uniform film thickness than an adhesive layer made of an adhesive or a hot melt adhesive. Further, in the present invention, since the concave portion and / or the convex portion is provided in the fusion bonding layer, the metal wire and the resin layer can be firmly adhered, and the shrinkage preventing effect is improved.

The resin molded body in which such a reinforcing material is embedded is
In addition to suppressing shrinkage and expansion due to temperature change, it is possible to improve the positioning accuracy in the longitudinal direction of the resin molded body during molding of the resin layer and eliminate the need for annealing after molding.

[Brief description of the drawings]

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

[Explanation of symbols]

 1 ... Window molding 2 ... Resin layer 3 ... Reinforcing material

Claims (5)

[Claims] 1. A reinforcing material comprising a metal wire and a fusion bonding layer formed by applying and fusing a heat fusion varnish directly or through another layer, wherein a concave portion and / or a convex portion is formed on the surface layer portion of the fusion bonding layer. A reinforcing material characterized by being provided with. 2. The reinforcing member according to claim 1, wherein the concave portion and / or the convex portion is formed by a particulate filler having an average particle diameter of 1 to 10 μm, which is mixed in the heat-sealing varnish. Material. 3. The concave and / or convex portions are formed of a particulate filler in which 1 to 50 parts by weight is mixed with 100 parts by weight of the resin component of the heat-sealing varnish. The reinforcing material according to claim 1. 4. The concave and / or convex portions are formed by passing a metal wire rod through a die having an inner peripheral surface having irregularities in the step of applying a heat-sealing varnish. The reinforcing material according to 1. 5. A resin molding, wherein a resin layer is extruded on the outer periphery of the reinforcing material according to claim 1.