CN110603128A - Composite molded article having sealing property - Google Patents
Composite molded article having sealing property Download PDFInfo
- Publication number
- CN110603128A CN110603128A CN201880030383.3A CN201880030383A CN110603128A CN 110603128 A CN110603128 A CN 110603128A CN 201880030383 A CN201880030383 A CN 201880030383A CN 110603128 A CN110603128 A CN 110603128A
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- China
- Prior art keywords
- molded article
- resin
- resin molded
- irregularities
- region
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Gasket Seals (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The purpose of the present invention is to provide a resin molded article which can further improve the reliability of airtightness at a joint portion when two molded articles are joined. The object of the present invention is achieved by a composite molded article in which a first molded article and a second resin molded article are welded to each other, the first molded article having a first welding surface provided on a surface thereof for welding with the second resin molded article, the first welding surface having a region where irregularities are formed by laser irradiation, the entire or a part of the region where the irregularities are formed being filled with a part of the second resin molded article, the second resin molded article having a part thereof protruding from the region where the irregularities are formed and being welded to the first welding surface, and the resin forming the second resin molded article being an elastic body.
Description
Technical Field
The present invention relates to a composite molded article having sealing properties.
Background
In recent years, in fields including automobiles, electric products, industrial equipment, and the like, there has been an increasing trend to replace a part of a metal molded article with a resin molded article in order to meet the demand for reduction in carbon dioxide emission, reduction in manufacturing cost, and the like. Along with this, composite molded articles obtained by integrating resin molded articles and metal molded articles have been widely used. Without being limited thereto, composite molded articles obtained by integrating molded articles made of the same or different materials have also become widely used.
As a method for producing a composite molded article obtained by integrating a plurality of molded articles, for example, the following production method is proposed.
Patent document 1 proposes: the surface of one resin molded article is irradiated with electromagnetic radiation to form a nanostructure on the surface, and then the other resin molded article is filled in contact with the surface and molded to be integrated therewith.
Patent document 2 describes: the airtightness of the joint portion when joining one molded article to another resin molded article can be improved.
Documents of the prior art
Patent document
Patent document 1: japanese patent publication No. 2011-529404
Patent document 2: japanese patent laid-open publication No. 2015-16575
Disclosure of Invention
Problems to be solved by the invention
However, in view of this airtightness, further improvement in joint strength is desired to be compatible. In particular, it is required to have sealability between molded articles such that there is a difference in angle or height at the sealing portion.
The present invention has been made to solve the above-described problems, and an object thereof is to provide a resin molded article which can further improve reliability of airtightness at a joint portion when two molded articles are joined.
Means for solving the problems
The present inventors have made extensive studies to solve the above problems. As a result, they found that: the object is achieved by the following.
(1) A composite molded article in which a first molded article and a second resin molded article are fused together,
the first molded article is a molded article having a first weld surface provided on a surface thereof for welding with the second resin molded article, the first weld surface has a region where irregularities are formed by laser irradiation, a part of the second resin molded article is filled in the entire or a part of the region where the irregularities are formed, a part of the second resin molded article is protruded from the region where the irregularities are formed and welded to the first weld surface, and the resin forming the second resin molded article is an elastic body.
(2) The composite molded article according to the above 1, wherein the elastomer is a rubber having a Mooney viscosity ML1+4(100 ℃) of less than 160 or a liquid.
(3) The composite molded article according to the above (1) or (2), wherein the second resin forming the second resin molded article is a thermoplastic elastomer having a melt flow rate of 3g/10 min or more under a condition of a melting point +20 ℃ and a load of 2160 g.
(4) A gasket comprising the composite molded article according to any one of the above (1) to (3).
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a composite resin molded article having high sealing properties can be provided.
Drawings
FIG. 1 is a schematic view of an evaluation tool of the present invention.
FIG. 2 is a schematic enlarged cross-sectional view of the composite molded article (shape 1) of the present invention.
FIG. 3 is a schematic enlarged cross-sectional view of another composite molded article (shape 2) according to the present invention.
FIG. 4 is a schematic enlarged cross-sectional view of another composite molded article (shape 3) according to the present invention.
FIG. 5 is a schematic enlarged cross-sectional view of another composite molded article (shape 4) according to the present invention.
FIG. 6 is a schematic enlarged cross-sectional view of another composite molded article (shape 5) according to the present invention.
FIG. 7 is a schematic enlarged cross-sectional view of a composite molded article (shape 6) free from flash according to the prior art.
FIG. 8 is a schematic enlarged cross-sectional view of a composite molded article (shape 7) without a groove according to the prior art.
Detailed Description
The present invention is not limited to the following embodiments, and can be carried out with appropriate modifications within the intended scope of the present invention.
The present invention is a composite molded article obtained by welding a first molded article and a second resin molded article, the first molded article having a surface provided with a first welding surface for welding with the second resin molded article, the first welding surface having a region where irregularities are formed by laser irradiation, the entire or a part of the region where the irregularities are formed being filled with a part of the second resin molded article, the second resin molded article having a part which protrudes from the region where the irregularities are formed and is welded to the first welding surface, and the resin forming the second resin molded article being an elastic body.
< first molded article >
Examples of the first molded article of the present invention include those made of resin or metal. The resin is not particularly limited as long as it is a resin capable of forming irregularities by laser irradiation. Examples thereof include polyphenylene sulfide (PPS), Liquid Crystal Polymer (LCP), polybutylene terephthalate (PBT), Polyacetal (POM), and the like. The resin composition may contain an inorganic filler such as glass fiber as described in Japanese patent laid-open publication No. 2015-16575.
Preferable examples of the metal material include aluminum, magnesium, stainless steel, copper, titanium, and nickel. The first molded article may be further subjected to plating or the like after the unevenness is formed by laser irradiation.
The shape of the first molded article may be appropriately selected as desired.
[ irregularities formed on the welded surface ]
The first molded article of the present invention has a region where irregularities are formed by laser irradiation on the surface where the first molded article and the second molded article are welded to each other. The formation of the unevenness by laser irradiation can be determined by observing the surface of the region where the unevenness is formed.
Specifically, when the first molded product is made of metal, not only the portion having a height in the direction perpendicular to the processing surface lower than that before the processing but also the portion having a height in the direction perpendicular to the processing surface higher than that before the processing exist. In the case where the first molded product is a resin, it can be determined that the first molded product is formed by laser irradiation as long as the presence of a carbonized layer of the resin can be confirmed by raman spectroscopic analysis of the surface of the concave portion.
The size of the unevenness can be appropriately selected according to the desired characteristics.
< method for producing first molded article >
The irradiation with the laser light is set based on the type of the irradiation target material, the output power of the laser device, and the like. In order to form the unevenness of a desired size, it is preferable to perform the formation by dividing the unevenness into a plurality of times. When the laser irradiation is repeated a plurality of times, it is preferable to include a step of increasing the irradiation amount of the laser light to be higher than the previous irradiation amount.
In the case of performing laser irradiation, the irradiation may be performed from a direction other than a direction perpendicular to the surface of the molded article.
< composite molded article >
The composite molded article of the present invention is a composite molded article obtained by combining a first molded article and a second molded article, wherein a part of the second molded article is filled in all or a part of a region where an irregularity is formed, and further, a part of the second molded article is protruded from the region where the irregularity is formed and fused to the first fusion-bonded surface, and the resin forming the second molded article is an elastic body.
When the composite molded article functions as a sealing material, the shape preferably has an edge shape or an R shape, and when the width of the gasket is small, flatness or misalignment of the contact portion is less likely to occur, and the R shape is particularly preferable. The size of the R-shape can be adjusted as appropriate depending on the size of the composite molded article to be obtained and the width of the gasket, and is preferably 0.5 to 10 times the width of the gasket.
[ second resin ]
In order to ensure sealability, the second resin forming the second resin molded article of the present invention preferably comprises: is an elastomer at 25 ℃ and has a Mooney viscosity ML1+4(100 ℃) of less than 160 or is a liquid rubber. Alternatively, the melt flow rate under the conditions of melting point +20 ℃ and load 2160g is preferably 3g/10 min or more.
Any rubber or the like can be suitably used as long as it is used as a general sealing material, and specifically, acrylonitrile-butadiene rubber (hereinafter abbreviated as NBR), fluorine rubber, acrylic rubber, silicone rubber, styrene elastomer, and chloroprene rubber are preferable.
< method for producing composite molded article >
In the present invention, a composite molded article can be produced by melting a predetermined welding surface of a first molded article having an uneven portion formed thereon in advance and flowing a second resin thereinto, or by pressure bonding or heat welding. In this case, the second resin is formed by being extruded from the region of the first molded product where the irregularities are to be welded, so that the sealing property of the welded portion can be ensured. The amount of the overflow from the region where the irregularities are formed can be appropriately selected according to the desired sealability.
In the present invention, the second resin does not necessarily need to completely fill the region where the irregularities are formed, and sealing properties can be obtained by blocking a part of the region where the irregularities are formed. A part of the region formed with the concavity and convexity preferably covers at least one of the inner side or the outer side in a direction in which sealability is required at least in the region formed with the concavity and convexity. Here, the direction in which the sealing property is required means: the second resin molded article is sandwiched from one side to the other side, that is, the direction in which a fluid leaks or enters from the inside to the outside of the composite molded article or from the outside to the inside of the composite molded article.
Since the second resin molded article of the present invention can function as a sealing material such as a gasket, the second resin molded article may be further covered with a third resin molded article.
Examples
The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.
< example 1>
The evaluation tool cap, which is a composite molded article obtained by combining the gaskets as shown in fig. 1, was produced according to the raw materials and production conditions shown in tables 1 to 3. The body is aluminum a 5052. The sample was evaluated for adhesiveness and airtightness.
In tables 1 to 3, the resin materials of the resin molded articles are shown below.
PPS-GF 40%: PPS mixed with glass fiber: DURAFIGHT (registered trademark) 1140A7 (manufactured by Polyplasts Co., Ltd.)
PBT-GF 30%: PBT blended with glass fiber: DURANEX (registered trademark) 3300 (manufactured by WinTech Polymer Co., Ltd.)
PA-GF 30%: AMILAN (registered trademark) CM1016G-30 (manufactured by Toray corporation)
A5052: aluminium alloy (made by Shenhu steel)
NBR: a product obtained by kneading a plasticizer and a crosslinking agent into a nitrile rubber with a kneader and adjusting the Mooney viscosity ML1+4(100 ℃) to 40
Fluororubber 1: a product obtained by kneading a plasticizer and a crosslinking agent into FKM (vinylidene fluoride-hexafluoropropylene copolymer) with a kneader to adjust the Mooney viscosity ML1+4(100 ℃) to 160
2, fluororubber: a product obtained by kneading a plasticizer and a crosslinking agent into FKM (vinylidene fluoride-hexafluoropropylene copolymer) with a kneader to adjust the Mooney viscosity ML1+4(100 ℃) to 180
Acrylic rubber: a product obtained by kneading a plasticizer and a crosslinking agent into ACM (acrylate-2-chloroethyl vinyl ether copolymer) with a kneader to adjust the Mooney viscosity ML1+4(100 ℃) to 40
Silicone rubber: RBL-9200-20 (manufactured by Donglidao kangning company)
Styrene elastomer 1: TUFPRENE (registered trademark) A, (manufactured by Asahi chemical Co., Ltd.)
Styrene elastomer 2: TUFPRENE (registered trademark) 125 (manufactured by Asahi chemical Co., Ltd.)
[ production of first molded article ]
For the materials shown in tables 1 to 3, the laser was irradiated 10 times in a diagonal lattice pattern so that the width of the irregularities became 100 μm and the interval between adjacent irregularities became 200 μm. Using the oscillation wavelength: 1.064 μm, maximum rated output power: 13W (average), output 90%, frequency 40kHz, scanning speed 1000 mm/s. Thus, the first molded product described in example was obtained.
[ production of composite molded article ]
In each of the first molded articles described in the examples, a surface having a region in which irregularities are formed by laser light irradiation is used as a contact surface, and when the material of the second resin molded article is a thermoplastic elastomer, the thermoplastic elastomer is injection-molded in a state in which the first molded article is set in a mold for molding, thereby obtaining a composite molded article described in the examples. In the case where the material of the second resin molded article is liquid rubber, the first molded article is set in the molding die and molded by a liquid rubber injection system, thereby obtaining a composite molded article according to the example. In the case where the material of the second resin molded article is rubber such as NBR that can be subjected to direct injection molding, the composite molded article according to the example is obtained by performing direct injection molding while the first molded article is set in a molding die.
As comparative example 2, a composite molded article of shape 7 of shape 1, which was not subjected to laser treatment, was produced.
< bonding State >
Evaluation method
The fracture surface of the composite molded article taken out of the molding die and broken by hand stretching was visually observed, and sensory evaluation was performed.
O: the pad (second resin molded article) and/or the first molded article have base material damage on the entire surface of the laser-treated part of the first molded article
And (delta): the gasket (second resin molded article) and/or the first molded article were subjected to base material breakage in a part of the laser-treated part of the first molded article and interfacial separation in a part thereof
X: the spacer (second resin molded article) was peeled off from the laser-treated part of the first molded article at the interface (the second resin molded article was not left in the laser-treated part of the first molded article)
< air-tightness >
Evaluation method
An evaluation tool was set as shown in fig. 1, the cap 1 was fixed to the body 3 with a clip and placed in water, and 0.1MPa of compressed air was injected from the hole 3(1/8 inch lower hole for nut 3t flange) at the bottom of the body to evaluate the airtightness with the presence or absence of air bubbles.
O: leakage occurred in 0 out of 10, Δ: leakage occurred in 1 out of 10 x: more than 2 of 10 leaked
[ Table 1]
[ Table 2]
[ Table 3]
Description of the reference numerals
1 evaluation tool cover
2 evaluation tool body
Lower hole 3t flange for 31/8 inch nut
4 shim
5 forming the concave-convex area by laser
Claims (4)
1. A composite molded article in which a first molded article and a second resin molded article are fused together,
the first molded article is a molded article having a first weld surface provided on a surface thereof for welding with the second resin molded article, the first weld surface has a region where irregularities are formed by laser irradiation, a part of the second resin molded article is filled in the entire or a part of the region where the irregularities are formed, a part of the second resin molded article is protruded from the region where the irregularities are formed and welded to the first weld surface, and the resin forming the second resin molded article is an elastic body.
2. The composite molded article according to claim 1, wherein the elastomer is a rubber having a Mooney viscosity ML1+4(100 ℃) of less than 160 or a liquid.
3. 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 3g/10 min or more under a condition of a melting point +20 ℃ and a load of 2160 g.
4. A gasket comprising the composite molded article according to any one of claims 1 to 3.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017096289A JP6902394B2 (en) | 2017-05-15 | 2017-05-15 | Composite molded product with sealing properties |
| JP2017-096289 | 2017-05-15 | ||
| PCT/JP2018/017790 WO2018212017A1 (en) | 2017-05-15 | 2018-05-08 | Composite molded article with sealing property |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110603128A true CN110603128A (en) | 2019-12-20 |
| CN110603128B CN110603128B (en) | 2022-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880030383.3A Active CN110603128B (en) | 2017-05-15 | 2018-05-08 | Composite molded article having sealing property |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6902394B2 (en) |
| CN (1) | CN110603128B (en) |
| WO (1) | WO2018212017A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2018212017A1 (en) | 2018-11-22 |
| JP6902394B2 (en) | 2021-07-14 |
| JP2018192651A (en) | 2018-12-06 |
| CN110603128B (en) | 2022-04-08 |
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