JP2018192651A - Composite molded article having sealability - Google Patents

Abstract

To provide a resin molded article capable of much more enhancing reliability in airtightness of a joint part when two molded articles are jointed.SOLUTION: A composite molded article of this invention includes a first molded article and a second resin molded article which are welded with each other. The first molded article is provided with a first welding surface thereon for being welded with the second resin molded article; the first welding surface includes an area on which irregularities are formed by laser irradiation; and a part of the second resin molded article is loaded to an entirety or a part of the area formed of the irregularities. A part of the second resin molded article is welded to the first welding surface, running over the area formed of the irregularities and resin that forms the second resin molded article is an elastic body.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a composite molded article having a sealing property.

  In recent years, in areas such as automobiles, electrical products, industrial equipment, etc., there has been an increasing movement to replace some metal molded products with resin molded products in order to meet demands for reducing carbon dioxide emissions and manufacturing costs. ing. Accordingly, composite molded products in which a resin molded product and a metal molded product are integrated are widely used. However, the present invention is not limited to this, and composite molded products in which molded products made of the same or different materials are integrated are also widely used.

As a method for manufacturing a composite molded product obtained by integrating a plurality of molded products, for example, the following has been proposed.
In Patent Document 1, nanostructures are formed on the surface of one resin molded product by irradiating electromagnetic radiation, and then the other resin molded product is contacted with the surface and filled, molded, and integrated. It has been proposed to let
Patent Document 2 describes that the airtightness at the joint when one molded product and another resin molded product are joined can be improved.

Special table 2011-529404 gazette JP2015-16575A

  However, regarding this airtightness, a further improvement that is compatible with the bonding strength has been desired. In particular, there has been a demand for a sealing property between molded products having corners and steps at the sealing portion.

  The present invention has been made to solve the above-described problems, and the object thereof is to further increase the reliability of the airtightness of the joint when joined to two molded articles. It is to provide a resin molded product.

  The inventors of the present invention have made extensive studies in order to solve the above problems. As a result, it has been found that the object is achieved by the following.

(1) A composite molded product in which a first molded product and a second resin molded product are welded,
The first molded product is a molded product provided with a first welding surface on the surface for welding with the second resin molded product, and irregularities due to laser irradiation are formed on the first welding surface. A part of the second resin molded product is filled in all or part of the region where the unevenness is formed, and the second resin molded product is partially formed with the unevenness. A composite molded product that protrudes from the formed region and is welded to the first welding surface, and the resin forming the second resin molded product is an elastic body.
(2) The composite molded article according to 1 above, wherein the elastic body is a rubber having a Mooney viscosity ML1 + 4 (100 ° C.) of less than 160 or liquid.
(3) The composite according to (1) or (2), wherein the second resin forming the second resin molded product is a thermoplastic elastomer having a melt flow rate of 3 g / 10 min or more at a load of 2160 g at a melting point + 20 ° C. Molding.
(4) A gasket comprising the composite molded product according to any one of (1) to (3).

  ADVANTAGE OF THE INVENTION According to this invention, a composite resin molded product with high sealing performance can be provided.

It is a schematic diagram of the evaluation jig of the present invention. It is a schematic diagram of the general | schematic expanded cross section of the composite molded product (shape 1) of this invention. It is a schematic diagram of the general | schematic expanded cross section of another composite molded product (shape 2) of this invention. It is a schematic diagram of the general | schematic expanded cross section of another composite molded product (shape 3) of this invention. It is a schematic diagram of the general | schematic expanded cross section of another composite molded product (shape 4) of this invention. It is a schematic diagram of the general | schematic expanded cross section of another composite molded product (shape 5) of this invention. It is a schematic diagram of the general | schematic expanded cross section of the composite molded product (shape 6) without the protrusion which concerns on a prior art. It is a schematic diagram of the general | schematic expanded cross section of the composite molded product (shape 7) without a groove | channel which concerns on a prior art.

  Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the object of the present invention. .

  The present invention is a composite molded product in which a first molded product and a second resin molded product are welded, and the first molded product is welded to the surface on the first resin molded product. The first welded surface has a region with irregularities formed by laser irradiation, and the second resin is formed on all or part of the regions with the irregularities formed thereon. Part of the molded product is filled, and the second resin molded product protrudes from the region where the unevenness is formed and is welded to the first welding surface to form the second resin molded product. The resin is an elastic body.

<First molded product>
Examples of the first molded article of the present invention include those made of resin and metal. The resin is not particularly limited as long as irregularities can be formed by laser irradiation. Examples thereof include polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polybutylene terephthalate (PBT), polyacetal (POM), and the like. The resin composition containing inorganic fillers, such as glass fiber as described in Unexamined-Japanese-Patent No. 2015-16575 may be sufficient.
Preferred examples of the metal material include aluminum, magnesium, stainless steel, copper, titanium, and nickel. The first molded product may be further subjected to plating or the like after forming irregularities by laser irradiation.
The shape of the first molded product can be appropriately selected as desired.

[Unevenness formed on the weld surface]
The first molded product of the present invention has a region where irregularities are formed by laser irradiation on the weld surface with the second resin molded product. Whether the irregularities are formed by laser irradiation can be determined by observing the surface of the region where the irregularities are formed.

Specifically, when the first molded product is a metal, not only the height in the direction perpendicular to the treatment surface is lower than that before the treatment, but also a high portion exists. It can be determined that it is formed. Further, when the first molded product is a resin, it can be determined that the resin is formed by laser irradiation if the presence of a carbonized resin layer can be confirmed by Raman spectroscopic analysis of the surface of the recess.
The size of the unevenness can be appropriately selected according to desired characteristics.

<Method for producing first molded product>
Laser irradiation is set based on the type of material to be irradiated, the output of the laser device, and the like. In order to form unevenness of a desired size, it is preferable to carry out a plurality of times. When laser irradiation is repeated a plurality of times, it is preferable to include a step of increasing the laser irradiation amount from the previous irradiation amount.
When performing laser irradiation, you may perform from another direction other than performing perpendicularly | vertically with respect to the surface of a molded article.

<Composite molded product>
The composite molded product of the present invention is a composite of the first molded product and the second resin molded product, and a part of the second resin molded product fills all or a part of the region where the irregularities are formed. In addition, the second resin molded product is partly protruded from the region where the irregularities are formed and welded to the first welding surface, and the resin forming the second resin molded product is an elastic body. .
When the composite molded product functions as a sealing material, the shape preferably has an edge shape or an R shape, and flatness and displacement of the contact portion are less likely to occur when the gasket width is small. A shape is preferred. The size of the R shape can be appropriately adjusted according to the size of the composite molded product to be obtained and the width of the gasket, and is preferably ½ times to 10 times the width of the gasket.

[Second resin]
The second resin forming the second resin molded product of the present invention is preferably an elastic body at 25 ° C. in order to ensure sealing properties, and has a Mooney viscosity ML1 + 4 (100 ° C.) of less than 160 or a liquid rubber. Or it is preferable that it is a thermoplastic elastomer whose melt flow rate in 2160-g load in melting | fusing point +20 degreeC is 3 g / 10min or more.

  Any rubber or the like used as a normal sealing material can be suitably used. Specifically, acrylonitrile butadiene rubber (hereinafter abbreviated as NBR), fluorine rubber, acrylic rubber, silicone rubber, styrene elastomer, A chloroprene rubber is preferable.

<Production method of composite molded product>
In the present invention, a composite molded product can be manufactured by melting and pouring the second resin onto the planned welding surface of the first molded product, on which irregularities are formed in advance, or by pressure welding and heat welding. In that case, the 2nd resin can ensure the sealing performance of a welding part by protruding and forming the area | region in which the unevenness | corrugation planned to weld the 1st molded article was formed. The amount of protrusion from the region where the irregularities are formed can be appropriately selected depending on the desired sealing property.

In the present invention, it is not always necessary for the second resin to fill the entire region where the unevenness is formed. If the second resin blocks a part of the region where the unevenness is formed, a sealing property can be obtained. It is preferable that a part of the region in which the unevenness is formed covers at least one end on the inner side or the outer side with respect to the direction in which the sealing property is required, at least in the region in which the unevenness is formed. Here, the direction in which sealability is required refers to preventing leakage or intrusion of fluid from one side to the other side of the second resin molded product, that is, from the inside of the composite molded product to the outside or from the outside to the inside of the composite molded product. Point to the power direction.
Since the second resin molded product of the present invention can function as a sealing material such as a gasket, the second resin molded product can be further covered with a third resin molded product.

EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited by these Examples.

<Example 1>
According to the raw materials and manufacturing conditions described in Tables 1 to 3, an evaluation jig lid, which is a composite molded product in which gaskets are combined as shown in FIG. 1, was manufactured. The main body is aluminum A5052. About this sample, bondability and airtightness were evaluated.
In Tables 1-3, the material of the resin in the resin molded product is as follows.
PPS-GF 40%: Glass fiber-containing PPS: Durafide (registered trademark) 1140A7 (manufactured by Polyplastics)

PBT-GF 30%: PBT with glass fiber: DURANEX (registered trademark) 3300 (manufactured by Wintech Polymer)
PA-GF 30%: Amilan (registered trademark) CM1016G-30 (manufactured by Toray Industries, Inc.)
A5052: Aluminum alloy (manufactured by Kobe Steel)
NBR: A nitrile rubber with a plasticizer and a cross-linking agent kneaded with a kneader and Mooney viscosity ML1 + 4 (100 ° C.) adjusted to 40 Fluoro rubber 1: Plasticizer with FKM (vinylidene fluoride / hexafluoropropylene copolymer) Kneaded with a kneader and Mooney viscosity ML1 + 4 (100 ° C.) adjusted to 160 Fluororubber 2: FKM (vinylidene fluoride / hexafluoropropylene copolymer) with a plasticizer and a crosslinking agent kneaded Mooney viscosity ML1 + 4 (100 ° C.) adjusted to 180 Acrylic rubber: ACM (acrylic acid ester / 2-chloroethyl vinyl ether copolymer) is kneaded with a plasticizer and a crosslinking agent, and Mooney viscosity ML1 + 4 (100 ℃) adjusted to 40 Silicone rubber: RBL-9200-20 (Toray Dow Corning G
Styrene Elastomer 1: Tufprene (Registered Trademark) A, (Asahi Kasei Corporation)
Styrene elastomer 2: Toughprene (registered trademark) 125, (Asahi Kasei Corporation)

[Manufacture of first molded product]
The materials shown in Tables 1 to 3 were irradiated with a laser 10 times in an oblique lattice shape so that the width of the unevenness was 100 μm and the interval between adjacent unevennesses was 200 μm. The oscillation wavelength was 1.064 μm, the maximum rated output was 13 W (average), the output was 90%, the frequency was 40 kHz, and the scanning speed was 1000 mm / s. As a result, a first molded product according to the example was obtained.

[Manufacture of composite molded products]
For each of the first molded articles according to the examples, when the surface having the region where the projections and depressions are formed by laser irradiation is used as the contact surface, and the material related to the second resin molded article is a thermoplastic elastomer, the first molded article The composite molded product according to the example was obtained by injection-molding the thermoplastic elastomer in a state where was installed in the molding die. When the material related to the second resin molded product is liquid rubber, the composite molded product according to the embodiment is formed by molding with the liquid rubber injection system in a state where the first molded product is placed in the molding die. Got. In the case where the material related to the second resin molded product is NBR or other rubber that can be subjected to direct pressure injection molding, the first molded product is placed in the molding die and subjected to direct pressure injection molding. A composite molded article was obtained.
As Comparative Example 2, a composite molded product of shape 7 that was not subjected to laser treatment in shape 1 was produced.

<Join state>
≪Evaluation method≫
The fractured surface, which was broken by manually pulling the composite molded product taken out from the molding die, was visually observed and subjected to sensory evaluation.
◯: Gasket (second resin molded product) and / or first molded product breaks the base material on the entire laser processing part of the first molded product Δ: Gasket (second resin molded product) and / or first molded product However, in the laser processing part of the first molded product, a part of the base material is broken and a part of the interface is peeled. X: Gasket (second resin molded product) is peeled off from the laser processing part of the first molded product (first No second resin molded product remains in the laser processing part of one molded product)

<Airtightness>
≪Evaluation method≫
As shown in FIG. 1, an evaluation jig is provided, the lid 1 is fixed to the main body 3 with a clip and put in water, and compressed air of 0.1 MPa from the hole 3 at the bottom of the main body (1/8 inch female screw pilot hole 3t flange) The airtightness was evaluated by the presence or absence of bubbles.
○: 0 occurrences of 10 leaks, Δ: 1 occurrence of 10 leaks, ×: 2 or more occurrences of 10 leaks

1 Evaluation jig lid
2 Evaluation jig body 3 1/8 inch internal thread pilot hole 3t flange 4 Gasket 5 Area where irregularities are formed by laser

Claims (4)

A composite molded product in which a first molded product and a second resin molded product are welded,
The first molded product is a molded product provided with a first welding surface on the surface for welding with the second resin molded product, and irregularities due to laser irradiation are formed on the first welding surface. A part of the second resin molded product is filled in all or a part of the region where the unevenness is formed, and the second resin molded product has a part of the unevenness. A composite molded product that protrudes from the formed region and is welded to the first welding surface, and the resin forming the second resin molded product is an elastic body.   The composite molded article according to claim 1, wherein the elastic body is a rubber having a Mooney viscosity ML1 + 4 (100 ° C) of less than 160 or liquid.   The composite molded article according to claim 1 or 2, wherein the second resin forming the second resin molded article is a thermoplastic elastomer having a melt flow rate of 3 g / 10 min or more at a melting point of + 20 ° C and a load of 2160 g. A gasket comprising the composite molded product according to any one of claims 1 to 3.

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