JP2015016575A - Composite molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain an integrated component having high airtightness and high bonding strength.SOLUTION: In a composite molding 1 of the present invention, a first molding 10 and a second molding 20 are welded to each other. The first molding 10 is a resin molding containing an inorganic filler 13 and juxtaposed with first welding surfaces 11, welded to the second molding 20, on its surface. The second molding 20 is a molding juxtaposed with second welding surfaces 21, welded to the first molding 10, on its surface. In the first molding 10 and the second molding 20, the first welding surface 11 and the second welding surface 21 are brought into contact with each other in a state facing each other, and a part sandwiched by the juxtaposed first welding surfaces 11 and a part sandwiched by the juxtaposed second welding surfaces 21 face each other with a space therebetween. A plurality of fine grooves 11A are formed in the first welding surface 11 by laser irradiation or chemical dissolution, and the inorganic filler 13 and dissolved materials of the second molding 20 are contained in the plurality of fine grooves 11A. An elastic body 30 is inserted into the space.

Description

  The present invention relates to a composite molded article and a manufacturing method thereof.

  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 manufacturing method of a composite molded product in which one molded product and another molded product are integrated, for example, the following is proposed. In Patent Document 1, a filler such as glass fiber is mixed in one resin and molded, and the surface to which the other resin is bonded is treated with chemicals, plasma, flame, etc. It has been proposed that after removing a resin of several μm to several tens of μm, the other resin is brought into contact with a surface to which the other resin is adhered, filled, molded, and adhered. Further, in Patent Document 2, a surface of one resin molded product is irradiated with electromagnetic radiation to form a nanostructure on the surface, and then the other resin molded product is filled and molded in contact with the surface. It has been proposed to integrate.

JP-A-01-126339 Special table 2011-529404 gazette

  However, there is room for further improvement regarding the airtightness at the joint when one molded product and another molded product are joined.

  The present invention has been made in order 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 another molded product. 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, as the first molded product, a resin molded product containing an inorganic filler was subjected to laser irradiation or chemical treatment to form a plurality of minute grooves in which the inorganic filler was exposed and the inorganic filler protruded from the side surface. Inorganic that is exposed to the minute groove when the first molded product and the second molded product are joined by using an elastic body in the gap between the first molded product and the second molded product. The filler plays the role of an anchor that suppresses the destruction of the first molded product and the second molded product, and can be joined and integrated with strength by sandwiching the elastic body. As a result, the airtightness of the joint portion of the composite molded product It has been found that the reliability of the airtightness can be remarkably improved, and in particular, airtightness can be realized even when the first molded product and the second molded product are a combination of different materials. Specifically, the present invention provides the following.

  (1) The present invention is a composite molded product in which a first molded product and a second molded product are welded, wherein the first molded product contains an inorganic filler, and the second molded product is formed on the surface. And the second molded product is a molded product in which a second welded surface that is welded to the first molded product is provided on the surface, In the first molded product and the second molded product, the first welding surface and the second welding surface face each other and come into contact with each other, and a space into which an elastic body is inserted is provided. The surface is formed with microgrooves from which the inorganic filler protrudes from the side wall surface, and the plurality of microgrooves include the inorganic filler and the melted solidified product of the second molded product, and the space is elastic. It is a composite molded product in which the body is inserted.

  (2) Moreover, this invention is a composite molded article as described in (1) with which the said 1st welding surface and the said 2nd welding surface are arranged in parallel at the position which pinches | interposes the space where the said elastic body is inserted. is there.

  (3) Moreover, this invention is a composite molded product as described in (1) or (2) in which the said microgroove is formed by laser irradiation.

  (4) Further, the present invention is the composite molded product according to any one of (1) to (3), wherein the first molded product and the second molded product are made of different materials.

  (5) Further, the present invention provides a laser to the first molded product comprising a resin molded product containing an inorganic filler and having a first welding planned surface scheduled to be welded to the second molded product on the surface. And forming a plurality of microgrooves in which the inorganic filler is exposed and the inorganic filler protrudes from the side wall surface, and an elastic body is inserted into the space of the first molded product. An elastic body inserting step, a second molded product in which a second welding planned surface scheduled to be welded to the first molded product is arranged on the surface, and the first molded product, the first welding scheduled The surface and the second welding scheduled surface face each other, and a portion sandwiched between the first welding surfaces arranged side by side and a portion sandwiched between the second welding surfaces arranged side by side face each other via the elastic body. The disposing step to dispose and the second welding planned surface is melted and placed in front of the minute groove And a melt infiltration step of entering the melt of the second molded product, a method for producing a composite molded article.

  According to the present invention, the inorganic filler exposed in the microgrooves serves as an anchor that suppresses the destruction of the first molded product and the second molded product, and can be joined and integrated with strength in the form of sandwiching the elastic body, As a result, the reliability to the airtightness of the joint portion of the composite molded body can be remarkably enhanced. In particular, the first molded product and the second molded product are preferable in that airtightness can be realized even in a combination of different materials.

It is a schematic sectional drawing of the composite molded product 1 of this invention. It is a schematic enlarged view in the interface (dotted line location of FIG. 1) of the welding surfaces 11 and 12 in the composite molded product 1 of this invention. It is a schematic explanatory drawing when obtaining the composite molded product 1 by ultrasonic welding or hot plate welding. It is a schematic explanatory drawing when the composite molded product 1 is obtained by laser welding. It is a schematic explanatory drawing when obtaining the composite molded product 1 by high frequency induction heating welding. It is a SEM photograph of the 1st molded product concerning test example 1 (resin comparison). 4 is a SEM photograph of a first molded product according to Test Example 2.

  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. . In addition, although description may be abbreviate | omitted suitably about the location where description overlaps, the summary of invention is not limited.

<Composite molded product 1>
FIG. 1 is a schematic sectional view of a composite molded article 1 of the present invention. The composite molded product 1 includes a first molded product 10 and a second molded product 20, which are welded at welding surfaces 11 and 21.

[First molded product 10]
The first molded product 10 is a resin molded product containing an inorganic filler. Further, a first welding surface 11 that is welded to the second molded product 20 is provided in parallel on the surface of the first molded product 10 with the recess 12 therebetween.

〔resin〕
The type of the resin is not particularly limited as long as the fine groove can be formed by removing a part of the resin while leaving the inorganic filler. Examples of the fine grooves that can be formed by laser irradiation include polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polybutylene terephthalate (PBT), and polyacetal (POM).

  Examples of the chemical treatment include decomposition treatment with an acid or alkali, dissolution treatment with a solvent, and the like. In the case of an amorphous thermoplastic resin, it is easy to dissolve in various solvents, but in the case of a crystalline resin, both solvents are selected and used. Examples of the groove that can be formed with an acid include polyacetal (POM). In chemical treatment, it is important to perform chemical treatment limited to the groove formation scheduled portion and remove the product of the chemical treatment.

  The resin may be thermoplastic or thermosetting. In addition, when removing a part of the resin by laser irradiation, it is preferable to add an additive that easily absorbs the laser and generates heat. Generally, carbon black is used, and the blending amount is adjusted to an optimum amount according to the laser irradiation conditions.

[First welding surface 11]

  FIG. 2 is a schematic enlarged view at the interface I (dotted line portion in FIG. 1) of the welding surfaces 11 and 21 in the composite molded article 1 of the present invention. On the first welding surface 11, a plurality of minute grooves 11 </ b> A are formed by partially removing the resin by laser irradiation or chemical treatment.

(Micro groove 11A)
A plurality of minute grooves 11 </ b> A are formed on the surface of the welding surface 11. The inorganic filler 13 is exposed in the plurality of minute grooves 11A and protrudes from the side surface of the groove, and the melt of the second molded product 20 is included in the plurality of minute grooves 11A. By the way, in the present invention, the composite molded product 1 is manufactured by integrating the second molded product 20 with the surface having the minute grooves 11A of the first molded product 10 as a contact surface. Is not exposed. In the present specification, even if the inorganic filler 13 is not exposed in the composite molded product 1, the inorganic filler 13 is exposed from the minute groove 11 </ b> A in a mode in which the second molded product 20 is removed from the composite molded product 1. If so, it is assumed that “the inorganic filler 13 is exposed in the plurality of minute grooves 11 </ b> A”.

  The longitudinal direction of the minute groove 11A is preferably different from the longitudinal direction of the inorganic filler 13. If the longitudinal direction of the minute groove 11A and the longitudinal direction of the inorganic filler 13 are the same, for example, the inorganic filler 13 is suitably bridged between uneven ridges formed by a laser irradiation site and a non-irradiation site. As a result, the inorganic filler 13 tends to fall off from the first molded product 10, and the inorganic filler 13 serves as an anchor that suppresses the destruction of the first molded product 10 and the second molded product 20. It may not be able to fulfill enough.

  The plurality of microgrooves 11A formed on the surface of the resin molded product 10 may be formed in a stripe shape in which the microgrooves 11A do not intersect or may be formed in a lattice pattern in which the microgrooves 11A intersect. When the micro grooves 11A are formed in a lattice shape, it is preferable to form the micro grooves 11A in an oblique lattice shape in which the longitudinal direction of the micro grooves 11A is different from the longitudinal direction of the inorganic filler. In addition, when the minute grooves 11A are formed in a lattice shape, the lattice may have a rhombus shape. Further, when the micro grooves 11A are formed in a stripe shape that does not intersect, it can be expected that the airtightness of the joint portion is enhanced by providing the grooves along contour lines that connect both ends of the groove along the shape of the elastic body.

  In order to sufficiently fulfill the anchor effect, the interval W between adjacent microgrooves 11A is 0.75 times to 4 times the width of the microgrooves, that is, 150 μm to 800 μm if the microgroove width is 200 μm. It is preferable that the width is 1 to 2 times the width of the minute groove, that is, if the width of the minute groove is 200 μm, it is more preferably 200 μm to 400 μm. If the interval is 0.75 times the width of the minute groove, that is, if the width of the minute groove is less than 150 μm, the inorganic filler 13 sufficiently serves as an anchor that suppresses the destruction of the first molded article 10. When the composite molded product 1 is formed by joining the second molded product 20 with the minute groove 11A and an external force is applied to the composite molded product 1, the first molded product 10 may be broken with a low external force. is there. If the spacing is four times the width of the micro-grooves, that is, if the micro-groove width is 200 μm, if the distance exceeds 800 μm, the effect of the anchor that the inorganic filler 13 suppresses the breakage of the second molded product 20 is not sufficient. When an external force is applied to the composite molded product 1 when the composite molded product 1 is formed by joining the second molded product 20 with the groove 11A, the second molded product 20 may be broken with a low external force.

  Further, the depth D of the microgrooves 11A is sufficient if the inorganic filler 13 can be observed. However, in the composite molded product, it is preferable that the depth D of the microgrooves is 1/2 or more of the length in the short direction of the microgrooves. . When the depth is less than ½ of the length in the short direction of the minute groove 11A, when the composite molded product 1 is formed by joining the second groove 20 with the minute groove 11A, the minute groove 11A is exposed. Since the sufficient anchor effect is not generated between the inorganic filler 13 and the second molded product 20, there is a possibility that the first molded product 10 and the second molded product 20 cannot be firmly in close contact with each other.

  Further, in the composite molded product, the interval between adjacent minute grooves 11A is preferably 1 to 2 times the width of the minute grooves 11A. If the width of the minute groove 11A is too narrow, the inorganic filler 13 cannot sufficiently fulfill the role of an anchor that suppresses the destruction of the second molded product 20, and is joined to the second molded product 20 by the minute groove 11A and combined. When an external force is applied to the composite molded product 1 when the molded product 1 is formed, the second molded product 20 may be destroyed. If the interval between the adjacent minute grooves 11A is too narrow, the inorganic filler 13 cannot sufficiently serve as an anchor that suppresses the destruction of the first molded article 10, and is joined to the second molded article 20 by the minute grooves 11A. When the composite molded product 1 is formed, if the external force is applied to the composite molded product 1, the first molded product 10 may be destroyed.

[Inorganic filler 13]
The inorganic filler 13 is exposed in the plurality of minute grooves 11A. The inorganic filler 13 remains unremoved when part of the resin is removed by laser irradiation or chemical treatment, and is exposed to protrude from the side surface of the microgroove 11A when the microgroove is formed in the resin. If there is no particular limitation.

  Examples of the inorganic filler 13 include glass fibers, carbon fibers, whisker fibers, glass flakes, and glass beads. In order to prevent the inorganic filler 13 from falling off the composite molded article 1 and to make the inorganic filler 13 serve as an anchor that suppresses the destruction of the first molded article 10 and the second molded article 20, the inorganic filler The length of 13 is preferably such that the length in the longitudinal direction is longer than the length in the short direction of the minute groove 11A. In other words, the length in the short direction of the microgrooves 11 </ b> A is preferably shorter than the length in the longitudinal direction of the inorganic filler 13. If the shape is fibrous, the average fiber length is preferably longer than the length of the micro grooves 11A in the short direction. If the shape is irregular, plate-like, or particulate, the long diameter, preferably the average particle diameter, is It is preferable that the length of the minute groove 11A is longer than the length in the short direction.

  In the present invention, when the inorganic filler 13 exposed in the minute groove 11A serves as an anchor that suppresses the destruction of the first molded product 10 and the second molded product 20, it is formed by a laser irradiation site and a non-irradiation site. It is preferable that the shape of the inorganic filler 13 is a fibrous shape in that the uneven peaks formed by the uneven peaks or the sites where the chemical dissolution is performed and the sites where the chemical dissolution is not performed can be suitably bridged.

  Although content of the inorganic filler 13 is not specifically limited, It is preferable that it is 5 to 80 weight part with respect to 100 weight part of resin. If it is less than 5 parts by weight, even if the inorganic filler 13 is exposed in the minute groove 11A, the inorganic filler 13 can sufficiently serve as an anchor that suppresses the destruction of the first molded product 10 and the second molded product 20. There is no possibility. If it exceeds 80 parts by weight, the first molded product 10 may not have sufficient strength.

  Commercially available resin materials containing inorganic filler 13 include PPS with glass fiber (product name: Durafide PPS 1140A7, manufactured by Polyplastics Co., Ltd.), PPS with glass fiber / inorganic filler (product name: Durafide PPS 6165A7, Polyplastics), glass fiber-containing LCP (product name: Vectra LCP E130i, manufactured by Polyplastics), and the like.

[Recess 12]
The concave portion 12 is provided for inserting the elastic body 30 between the first molded product 10 and the second molded product 20 when welding the second molded product 20. By inserting the elastic body, the airtightness between the first molded product 10 and the second molded product 20 can be secured by the repulsive force of the elastic body, and as a result, the strength at the interface I of the melting surfaces 11 and 21 is increased. Can do. Commercially available packing made of rubber or elastomer can be used as the elastic body. The recess 12 may be provided on either the first molded product or the second molded product or on both.

  The depth of the concave portion 12 is not particularly limited, but the volume in which the elastic body is deformed and accommodated when the airtightness between the first molded product 10 and the second molded product 20 can be appropriately ensured to be a composite part. It is preferable that it is a grade which can ensure.

[Method for Manufacturing First Molded Product 10]
The first molded product 10 contains an inorganic filler 13, and a first welding scheduled surface (symbol 11 ′ in FIG. 3 and the like) scheduled to be welded to the second molded product 20 is arranged in parallel across the recess 12. This is obtained by performing laser irradiation or chemical treatment on the first molded product preliminary body made of a resin molded product, thereby forming a plurality of minute grooves 11A in which the inorganic filler 13 is exposed.

  The laser irradiation is set based on the type of material to be irradiated, the output of the laser device, and the like. However, if the resin is not irradiated with appropriate energy to form the microgroove 11A, the inorganic filler 13 is sufficiently exposed. However, it may be difficult to form the micro-groove 11A having the width and depth as set.

  In the chemical treatment, an acid, an alkali, an organic solvent or the like corresponding to the characteristics of the resin is selected and used. In a polyacetal resin molded product in which the resin is decomposed by an acid, the groove can be formed by decomposing and removing the place where the groove is provided with an acid. In the case of an amorphous resin molded product that is easily dissolved in an organic solvent, the groove can be formed by masking the portion other than the location where the groove is provided on the surface of the molded product in advance and then dissolving and removing with an organic solvent.

[Second molded product 20]
The second molded product 20 is a molded product in which a second welding scheduled surface 21 ′ scheduled to be welded to the first molded product 10 is arranged on the surface.

  The material of the second molded product 20 is not particularly limited as long as it can enter the minute groove 11A where the inorganic filler 13 is exposed in an uncured state. Any of curable resin, adhesive, metal and the like may be used.

  As for the shape of the second molded product 20, when facing the first molded product 10, the first welding surface 11 and the second welding surface 21 can face each other and come into contact with each other, and the elastic body insertion portion takes up space. There is no particular limitation as long as they can face each other.

[Elastic body]
The elastic body is not particularly limited as long as the molded product and the elastic body can be hermetically sealed by applying pressure to the molded product, but a seal part obtained by processing a soft elastic body such as rubber or elastomer, For example, a commercially available packing is preferably used.
<Method for producing composite molded article 1>
The composite molded product 1 is obtained through a micro-groove formation process, an elastic body insertion process, an arrangement process, and a melt intrusion process.

[Micro groove formation process]
As explained in the above [Production Method of First Molded Product 10], the micro-groove forming step contains the inorganic filler 13 and is scheduled to be welded to the second molded product 20 on the surface. In the step of forming a plurality of microgrooves in which the inorganic filler 13 is exposed by performing laser irradiation or chemical treatment on the first molded product preliminary body made of a resin molded product arranged in parallel with the recess 12 therebetween is there.

[Elastic body insertion process]
The elastic body insertion step is a step of inserting the elastic body 30 into the recess 12.

[Arrangement process]
In the arranging step, the second molded product 20 having a second weld planned surface 21 ′ scheduled to be welded to the first molded product 10 on the surface, and the first molded product 10 are arranged on the first weld planned surface. 21 and the second welding scheduled surface 22 face each other, and are arranged so as to face each other via a portion packing 30 sandwiched between the portion to be sandwiched between the first welding surfaces arranged side by side and the second welding surface to be disposed side by side. It is.

[Melute infiltration process]
The melt intrusion step is a step of melting the second welding scheduled surface 21 ′ and allowing the melt of the second molded product 20 to enter the minute groove 11A.

  Examples of the method for melting the second welding planned surface 21 ′ include ultrasonic welding, hot plate welding, laser welding, high frequency induction heating welding, and the like. Conventionally, when heat-welding resin molded products made of different materials, it is necessary to heat and melt both the first welding planned surface of the primary molded product and the second welding planned surface of the secondary molded product. However, in the invention described in this specification, even if the primary molded product and the secondary molded product are different materials, it is only necessary to heat and melt only the second welding scheduled surface. According to the invention described in the present specification, it is sufficient to press the second molded product 20 made of another resin against the first welding planned surface 11 ′ in which the minute groove 11A is formed in advance, and heat-weld. It is possible to obtain a composite molded product 1 with a small amount of protrusion and excellent in both dimensional accuracy and bonding strength.

  Hereinafter, the manufacturing method of the composite molded article 1 when using ultrasonic welding, hot plate welding, laser welding, and high frequency induction heating welding will be described with reference to FIGS.

[Ultrasonic welding or hot plate welding]
FIG. 3 is a schematic explanatory diagram when the composite molded article 1 is obtained by ultrasonic welding or hot plate welding. First, as shown in FIG. 3 (1), an elastic body is inserted into the first recess 12 of the first molded product 10. Subsequently, as shown in (2) of FIG. 3, the second planned welding surface that is the planned welding surface of the second molded product 20 is formed on the first planned welding surface 11 ′ that is the planned welding surface of the first molded product 10. Bring 21 'closer. At this time, the first welding planned surface 11 ′ and the second welding planned surface 21 ′ face each other so that the elastic body insertion portions face each other with a space therebetween.

  The first welding planned surface 11 'is a surface having the minute grooves 11A. Moreover, it is preferable that the 2nd welding plan surface 21 'has the convex-shaped front-end | tip part 23 generally provided in ultrasonic welding.

  Subsequently, as shown in (3) of FIG. 3, the first welding planned surface 11 ′ and the second welding planned surface 21 ′ are superposed and brought into pressure contact with each other in this state. Weld with a plate. When ultrasonic waves are used, longitudinal vibrations are generated on the joint surfaces, and the molded products 10 and 20 are welded by the frictional heat. By passing through the said process, the composite molded product 1 by ultrasonic welding or hot plate welding is obtained.

  The ultrasonic welding can be performed using, for example, an ultrasonic welder SONOPET Σ-1200 ultrasonic welding machine manufactured by Seidensha Electronics Co., Ltd.

[Laser welding]
FIG. 4 is a schematic explanatory diagram when the composite molded article 1 is obtained by laser welding. First, as shown in (1) of FIG. 4, an elastic body is inserted into the recess 12 of the first molded product 10. Subsequently, as shown in (2) of FIG. 4, a laser absorption portion 24 is provided on the second welding planned surface 21 ′ that is the welding planned surface of the second molded product 20. The laser absorption portion 24 is obtained by painting the second welding scheduled surface 21 ′ with black magic or the like. In the present embodiment, the laser absorption site is provided on substantially the entire surface of the second welding scheduled surface 21 ′, but it is sufficient if it is provided in advance on the site where welding is planned.

  Subsequently, as shown in (3) of FIG. 4, the second planned welding surface that is the planned welding surface of the second molded product 20 is formed on the first planned welding surface 11 ′ that is the planned welding surface of the first molded product 10. 21 'is opposed to each other and is brought into a pressure contact state using a clamp or the like. At this time, the first welding scheduled surface 11 ′ and the second welding scheduled surface 21 ′ are opposed to each other, and the elastic body insertion portion is opposed to each other through the packing 30.

  The first welding planned surface 11 'is a surface having a plurality of minute grooves 11A. The shape of the plurality of microgrooves 11A is not particularly limited, and the microgrooves 11A may be formed in a stripe shape that does not intersect or may be formed in a lattice shape in which the microgrooves 11A intersect. When the micro grooves 11A are formed in a lattice shape, it is preferable to form the micro grooves 11A in an oblique lattice shape in which the longitudinal direction of the micro grooves 11A is different from the longitudinal direction of the inorganic filler. In addition, when the minute grooves 11A are formed in a lattice shape, a rhombus shape may be used.

  The minute groove 11A in the first welding planned surface 11 'may be formed on the entire surface of the first welding planned surface 11', but it is sufficient if it is formed in a location where the second molded product 20 is welded.

  Subsequently, as shown in FIG. 4 (4), the laser beam is irradiated from the surface opposite to the second welding scheduled surface 21 'of the second molded product 20 toward the second welding planned surface 21'. Then, the second molded product 20 in the vicinity of the second welding scheduled surface 21 ′ is melted by laser irradiation, and the melted resin receives the force due to the pressure contact and enters the minute groove 11 </ b> A. Weld. By passing through the said process, the composite molded product 1 by laser welding is obtained.

  Laser irradiation may be performed at a single location or at multiple locations, but in the case of multiple locations, the number of locations to be irradiated is suppressed to such an extent that the force due to the pressure contact can be supported, and substantially It is preferable to irradiate the laser uniformly. When a large force is applied to the molten resin on the second welding planned surface 21 ′ and put into the minute groove 11A of the first molded product 10, the force is supported at an unmelted portion on the second welding planned surface 21 ′. Therefore, if there are too many places to irradiate, there is a possibility that an appropriate force cannot be applied to the molten resin. Further, if the laser is not irradiated almost uniformly, there is a possibility that distortion occurs in the joint portion.

  Conventionally, laser welding is performed when welding resin molded products made of the same kind of material. If it is a resin molded product made of the same kind of material, when the secondary molded product generates heat by receiving laser heat, the heat is also transferred to the opposite surface, and not only the planned welding surface of the secondary molded product but also the primary molded product planned to be welded. The surfaces also melt and melt together. On the other hand, even if laser welding is performed between resin molded products made of the same kind of material, it is possible to melt the planned end face of the secondary molded product and not to melt the planned weld end surface of the primary molded product.

  According to the present invention, even if the target resin molded products are different materials, if the planned welding surface of the secondary molded product is melted, the dissolved resin enters the minute groove 11A. Can be obtained. Further, since both the primary molded product and the secondary molded product are not melted simultaneously, the dimensional stability is excellent. Then, as the first molded product 10, a resin molded product containing the inorganic filler 13 is subjected to laser irradiation or chemical treatment, and a plurality of minute grooves 11 </ b> A in which the inorganic filler 13 is exposed and the inorganic filler protrudes from the side surface. When the first molded product and the second molded product are joined by inserting an elastic body into the gap 12 between the first molded product 10 and the second molded product 20, The inorganic filler 13 exposed in the minute groove 11A serves as an anchor that suppresses the destruction of the first molded product 10 and the second molded product 20, and can be joined and integrated with strength in the form of sandwiching an elastic body. As a result, the reliability of the airtightness of the joint portion of the composite molded body 1 can be remarkably enhanced. In particular, the first molded product 10 and the second molded product 20 are preferable in that airtightness can be realized even in the case of a combination of different materials. In view of the above, the present invention can be said to be an invention based on a novel idea.

[High frequency induction heating welding]
FIG. 5 is a schematic explanatory diagram when the composite molded product 1 is obtained by high-frequency induction heating welding. First, as shown in (1) of FIG. 5, an elastic body is inserted into the recess 12 of the first molded product 10. Subsequently, as shown in (2) of FIG. 5, the heating element 40 is placed on the first welding scheduled surface 11 ′, which is the welding scheduled surface of the first molded product 10, and the second molded product 20 is further placed thereon. At this time, the first welding planned surface 11 ′ and the second welding planned surface 21 ′, which is the welding planned surface of the second molded product 20, face each other. The first welding planned surface 11 ′ is a surface having the minute grooves 11A.

  The heating element 40 is not particularly limited as long as it has a through hole and generates heat when a high frequency is applied from a surface opposite to the second welding scheduled surface 21 '.

  Although the number of through holes may be one or plural, in the case of being plural, it is preferable to suppress the number of through holes to a level that can support the force due to the following pressure contact. When a large force is applied to the molten resin on the second welding planned surface 21 ′ and put into the minute groove 11A of the first molded product 10, the force is supported at an unmelted portion on the second welding planned surface 21 ′. Therefore, if there are too many through holes, there is a possibility that an appropriate force cannot be applied to the molten resin.

  Subsequently, as shown in FIG. 5 (3), the first welding planned surface 11 ′ and the second welding planned surface 21 ′ are overlapped and brought into a pressure contact state, and further, (4) in FIG. As shown in FIG. 5, a high frequency is applied from the surface opposite to the second welding planned surface 21 ′ in the second molded product 20 toward the second welding planned surface 21 ′. Then, by applying a high frequency, the second molded product 20 in the vicinity of the second welding scheduled surface 21 ′ is melted, and the melted resin enters the minute groove 11 </ b> A through the through hole of the heating element 40, and the second molded product. 20 is welded to the first molded product 10. By passing through the said process, the composite molded article 1 by high frequency induction heating welding is obtained.

  In the present specification, high frequency refers to an electromagnetic wave that can generate an induced current in a heating element and thereby heat the heating element. Moreover, in the schematic explanatory drawing, the first molded product 10 and the second resin molded product 20 are pressed against each other in a plane, but may be partially convex or may be pressed after heating and melting. Absent.

  Conventionally, high frequency induction heating welding is performed when welding resin molded products made of the same kind of material. In the case of a resin molded product made of the same kind of material, when the secondary molded product generates heat, the heat is transmitted to the opposite surface, and not only the planned weld surface of the secondary molded product but also the planned weld surface of the primary molded product melts. And melt together. On the other hand, even if laser welding is performed between resin molded products made of the same kind of material, it is possible to melt the planned end face of the secondary molded product and not to melt the planned weld end surface of the primary molded product.

  According to the present invention, even if the target resin molded products are different materials, if the planned welding surface of the secondary molded product is melted, the dissolved resin enters the minute groove 11A. Can be obtained. Further, since both the primary molded product and the secondary molded product are not melted at the same time, the dimensional stability is excellent as in the primary molded product. Then, as the first molded product 10, a resin molded product containing the inorganic filler 13 is subjected to laser irradiation or chemical treatment, and a plurality of minute grooves 11 </ b> A in which the inorganic filler 13 is exposed and the inorganic filler protrudes from the side surface. When the first molded product and the second molded product are joined by inserting an elastic body into the gap 12 between the first molded product 10 and the second molded product 20, The inorganic filler 13 exposed in the minute groove 11A serves as an anchor that suppresses the destruction of the first molded product 10 and the second molded product 20, and can be joined and integrated with strength in the form of sandwiching an elastic body. As a result, the reliability of the airtightness of the joint portion of the composite molded body 1 can be remarkably enhanced. In particular, the first molded product 10 and the second molded product 20 are preferable in that airtightness can be realized even in the case of a combination of different materials. In view of the above, the present invention can be said to be an invention based on a novel idea.

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

<Test Example 1> Comparison of resins in the first molded product

In Table 1, the material of the resin in the first molded product is as follows.
PPS with glass fiber: Durafide PPS 1140A7 black (manufactured by Polyplastics)
PPS with glass fiber and inorganic filler: Durafide PPS 6165A7 black (manufactured by Polyplastics) LCP with glass fiber: Vectra LCP E130i black (manufactured by Polyplastics)

The material in the second molded product is as follows.
POM: Duracon POM M450-44 (manufactured by Polyplastics)

[Manufacture of first molded product]
An injection-molded product obtained by injection-molding a resin material containing an inorganic filler shown in Table 1 under the following conditions, a laser is oblique lattice so that the width of the minute groove is 100 μm and the distance between adjacent minute grooves is 200 μm. Were irradiated 10 times. 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 test example was obtained.
(Conditions for injection molding in Duracon)
Pre-drying: 80 ° C, 3 hours Cylinder temperature: 190 ° C
Mold temperature: 80 ℃
Injection speed: 16mm / sec
Holding pressure: 80 MPa (800 kg / cm ² )
(Conditions for injection molding in DURAFIDE)
Pre-drying: 140 ° C, 3 hours Cylinder temperature: 320 ° C
Mold temperature: 140 ° C
Injection speed: 20mm / sec
Holding pressure: 50 MPa (500 kg / cm ² )
(Conditions for injection molding at Vectra)
Pre-drying: 140 ° C, 4 hours Cylinder temperature: 350 ° C
Mold temperature: 60 ℃
Injection speed: 200mm / sec
Holding pressure: 50 MPa (500 kg / cm ² )

[Evaluation]
[Enlarged observation of the first molded product]
About the 1st molded article which concerns on a test example, the surface which has a microgroove was expanded and observed with the electron microscope (SEM). There were three magnifications: 20 times, 100 times, and 300 times. The results are shown in FIG.

[Depth of minute groove]
In order to evaluate the depth of the minute groove, the depth of the minute groove was measured by cross-sectional observation of the first molded product according to the test example. The results are shown in Table 2.

  When the surface of a resin molded product containing an inorganic filler is melted so that micro grooves are formed, a plurality of micro grooves are formed, and the inorganic filler protrudes from the side surfaces of the grooves and is exposed in the plurality of micro grooves. It was confirmed that

<Test Example 2> Comparison of composite molded products

[Manufacture of first molded product]
An injection molded product obtained by injection molding the above LCP containing glass fiber (product name: Vectra LCP E130i, manufactured by Polyplastics Co., Ltd.) under the conditions shown above (injection molding conditions) has an oscillation wavelength of 1.064 μm and a groove width. Was 200 μm, and the gap between adjacent grooves was 200 μm, and the irradiation was performed in a slanted lattice pattern. The number of laser irradiations was 10, and the scanning speed was 1000 mm / s. As a result, a first molded product according to Test Example 2-1 was obtained.

  On the other hand, the LCP containing glass fiber (product name: Vectra LCP E130i, manufactured by Polyplastics Co., Ltd.) itself was used as a resin molded product according to Test Example 2-2.

[Manufacture of composite molded products]
The first molded product according to Test Example 2-1 was subjected to ultrasonic welding with Duracon POM M450-44 (manufactured by Polyplastics Co., Ltd.) with the surface on which the groove was provided as the first welding planned surface. Ultrasonic welding was performed using an ultrasonic welder SONOPET Σ-1200 ultrasonic welding machine manufactured by Seidensha Electronics Co., Ltd. under the conditions of an ultrasonic frequency of 20 kHz, an amplitude of 60 μm, and an air pressure of 0.1 MPa.

  Similarly, the resin molded product according to Test Example 2-2 was subjected to ultrasonic welding with Duracon POM M450-44 (manufactured by Polyplastics Co., Ltd.).

[Evaluation]
[Determination of composite molded product]
The results are shown in FIG.

  It is confirmed that it is possible to obtain a composite product that combines highly reliable airtightness and high strength by arranging the elastic body because the elastic body can firmly join the molded products while maintaining a high repulsive force. It was done.

DESCRIPTION OF SYMBOLS 1 Composite molded product 10 1st molded product 11 1st welding surface 11A Micro groove 12 Recessed part 13 Inorganic filler 20 2nd molded product 21 2nd welding surface 30 Elastic body

Claims (5)

A composite molded product in which the first molded product and the second molded product are welded,
The first molded product is a resin molded product that contains an inorganic filler and has a first welding surface on the surface that is welded to the second molded product,
The second molded product is a molded product in which a second welding surface that is welded to the first molded product is provided on the surface,
The first molded product and the second molded product are provided such that the first welding surface and the second welding surface face each other and contact each other, and a space into which an elastic body is inserted is provided.
The first welding surface is formed with microgrooves from which the inorganic filler protrudes from the side wall surface, and the plurality of microgrooves include the inorganic filler and the melted solidified product of the second molded product,
A composite molded article in which an elastic body is inserted in the space.   2. The composite molded product according to claim 1, wherein the first welding surface and the second welding surface are juxtaposed at positions sandwiching a space into which the elastic body is inserted.   The composite molded article according to claim 1, wherein the minute groove is formed by laser irradiation.   The composite molded product according to any one of claims 1 to 3, wherein the first molded product and the second molded product are made of different materials. Irradiating a laser or chemical treatment to the first molded product comprising a resin molded product containing an inorganic filler and having a first weld planned surface that is scheduled to be welded to the second molded product on the surface, Forming a plurality of microgrooves in which the inorganic filler is exposed and the inorganic filler protrudes from the side wall surface; and
An elastic body insertion step of inserting an elastic body into the space of the first molded product;
A second molded product having a second weld planned surface to be welded to the first molded product arranged on the surface, and the first molded product, the first weld planned surface and the second weld planned. An arrangement step in which the surface faces each other, and the portion sandwiched between the first welding surfaces arranged side by side and the portion sandwiched between the second welding surfaces arranged side by side face each other via the elastic body; ,
A method of manufacturing a composite molded article, comprising: a melt intrusion step of melting the second welding scheduled surface and infiltrating the melt of the second molded article into the minute groove.