JP6468197B2 - Thermosetting resin composition and metal resin composite - Google Patents

Description

  The present invention relates to a thermosetting resin composition and a metal resin composite.

  Techniques for joining resin members and metal members are required from various fields such as aircraft, automobiles, household appliances, and industrial equipment.

  As a method for joining a resin member and a metal member, fine irregularities are formed on the surface of the metal member, and after the thermosetting resin composition has entered the fine irregularities, the thermosetting resin composition is cured. Thus, a method of joining a resin member made of a thermosetting resin composition and a metal member has been proposed (for example, Patent Documents 1 and 2).

JP 2010-274600 A JP 2012-116126 A

Metal resin composites formed by joining a resin member and a stainless steel metal member are used in various product parts. Products using such parts are used for a long time under various temperature atmospheres.
According to the study by the present inventors, when a metal resin composite in which the bonding strength between the resin member and the stainless steel metal member is higher than the conventional level is exposed to a high temperature for a long time, the dimensions may change. It became clear that there was. A product using such a metal-resin composite as a component causes problems such as a gap due to dimensional changes.

  The present invention has been made in view of the above circumstances, a thermosetting resin composition capable of realizing a metal resin composite having excellent dimensional stability at high temperatures, and a metal resin composite having excellent dimensional stability at high temperatures. Is to provide.

According to the study by the present inventors, when a metal resin composite having an increased bonding strength between a resin member and a stainless steel metal member is exposed to a high temperature for a long time, the resin member side thermally shrinks. It became clear that the dimensions of the body changed. In addition, when the bonding strength between the resin member and the stainless steel metal member is strong, even if the resin member side is thermally contracted, the resin member and the stainless steel metal member do not peel off, so that the resin member and the stainless steel metal member may be deformed to the stainless steel metal member side. Became clear.
Based on the above knowledge, the present inventors have improved the elastic modulus and mechanical strength of the resin member in order to suppress the dimensional change at high temperature of the metal resin composite, and the relationship between the resin member and the metal member. Adjustment of the linear expansion coefficient was studied.
However, simply increasing the elastic modulus and mechanical strength of the resin member or simply adjusting the linear expansion coefficient between the resin member and the metal member sufficiently suppresses the dimensional change of the metal-resin composite at a high temperature. I couldn't.

  Therefore, the present inventors have further intensively studied a design guideline for realizing a metal resin composite excellent in dimensional stability at high temperatures. As a result, the inventors have found that the measure of the warpage change rate of the thermosetting resin composition devised by the present inventors is effective as such a design guideline, and reached the present invention.

That is, according to the present invention,
Of the metal resin composite comprising a resin member and a stainless metal member joined to the resin member, a thermosetting resin composition used for forming the resin member,
A thermosetting resin;
A filler,
A shrinkage inhibitor,
Including
The thermosetting resin is a phenolic resin;
When the total solid content of the thermosetting resin composition is 100% by mass, the content of the filler is 55% by mass or more and 85% by mass or less,
The shrinkage inhibitor is one or more selected from the group consisting of acrylonitrile butadiene rubber, unmodified polyvinyl acetate, and carboxylic acid-modified polyvinyl acetate,
Using a molding machine, the thermosetting resin composition has a thickness of 1 mm and a maximum height (Rz) of 15 ± 1 μm under the conditions of an effective pressure of 20 MPa, a mold temperature of 175 ° C., and a curing time of 3 minutes. The sheet-like metal resin composite having a length of 80 mm, a width of 10 mm, and a thickness of 4 mm is produced by injection molding into a mold in which a stainless steel sheet is placed, and then the sheet-like metal resin composite is 150 ° C. When stored for 250 hours,
Using a temperature-variable laser 3D measuring machine, the distance from the laser head when the laser is perpendicularly applied to the surface on the stainless steel sheet side of the sheet-like metal resin composite is the longest distance from the laser head. The difference between the far point and the closest point from the laser head is defined as the amount of warpage,
The amount of warpage before storage is X1,
When the amount of warpage after storage is X2,
In the sheet-like metal resin composite after the storage, the resin member made of the thermosetting resin composition and the stainless steel sheet maintain a bonded state,
A thermosetting resin composition having a warp change rate calculated by (X2-X1) / X1 × 100 of −35% or more and 35% or less is provided.

Furthermore, according to the present invention,
A metal resin composite comprising a resin member made of the thermosetting resin composition and a stainless metal member bonded to the resin member is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the thermosetting resin composition which can implement | achieve the metal resin composite excellent in the dimensional stability at high temperature, and the metal resin composite excellent in the dimensional stability at high temperature can be provided.

  The above-described object and other objects, features, and advantages will become more apparent from the preferred embodiments described below and the accompanying drawings.

It is sectional drawing which shows an example of the structure of the metal resin composite of embodiment which concerns on this invention. It is a schematic diagram for demonstrating the curvature change rate of embodiment which concerns on this invention. It is a schematic diagram for demonstrating the example of the cross-sectional shape of the recessed part which comprises the roughening layer of the stainless steel type metal member surface of embodiment which concerns on this invention. It is sectional drawing which showed typically an example of the manufacturing apparatus of the metal resin composite of embodiment which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In all the drawings, similar constituent elements are denoted by common reference numerals, and description thereof is omitted as appropriate. In addition, "-" of a numerical range represents the following from the above, unless there is particular notice.

FIG. 1 is a cross-sectional view showing an example of the structure of a metal resin composite 100 according to an embodiment of the present invention. FIG. 2 is a schematic diagram for explaining the warpage change rate of the embodiment according to the present invention.
The metal resin composite 100 includes a resin member 101 and a stainless steel metal member 102 joined to the resin member 101. The resin member 101 is formed of a thermosetting resin composition (P). The thermosetting resin composition (P) includes a thermosetting resin (A) and a filler (B). And as for thermosetting resin composition (P), the curvature change rate computed by the following (1)-(4) is -35% or more and 35% or less.

(1) Using a molding machine, the thermosetting resin composition (P) has a thickness of 1 mm and a maximum height (Rz) under the conditions of an effective pressure of 20 MPa, a mold temperature of 175 ° C., and a curing time of 3 minutes. ) Is cast into a mold having a 15 ± 1 μm stainless steel sheet, and a sheet-like metal resin composite having a length of 80 mm, a width of 10 mm and a thickness of 4 mm is produced. Rz is measured according to JIS-B0601. Here, the thickness of the resin member is 3 mm.
(2) The obtained sheet-like metal resin composite is stored at 150 ° C. for 250 hours.
(3) The distance from the laser head A when the laser is perpendicularly applied to the surface of the sheet-like metal resin composite on the stainless steel sheet side using a temperature variable laser three-dimensional measuring machine. The difference between the farthest farthest point P1 and the nearest point P2 having the closest distance from the laser head A is defined as a warp amount X, the warp amount before storage is X1, and the warp amount after storage is X2.
(4) The warpage change rate is calculated from the following equation.
Warpage change rate [%] = (X2−X1) / X1 × 100
Here, in the sheet-like metal resin composite after storage, the resin member made of the thermosetting resin composition (P) and the stainless steel sheet are kept in a joined state.

  By setting the warpage change rate within the above range, the dimensional change of the metal resin composite 100 can be suppressed even when stored or used for a long time in a high temperature environment. Thereby, it becomes possible to improve the stability at the time of use or storage of the product obtained by using the metal resin composite 100 in a high temperature environment. In this embodiment, from the viewpoint of more effectively improving the stability during use or storage of the product obtained in a high temperature environment, the warpage change rate is more preferably -30% or more and 30% or less, It is particularly preferable that it is -25% or more and 25% or less.

Further, the warpage amount X1 before storage is not particularly limited, but is preferably 0.1 mm or more, more preferably 0.01 mm or more, particularly preferably 0.00 mm or more, and preferably 0.50 mm or less, more preferably Is 0.25 mm or less.
Further, the warpage amount X2 after storage is not particularly limited, but is preferably 0.1 mm or more, more preferably 0.01 mm or more, particularly preferably 0.00 mm or more, and preferably 0.65 mm or less, more preferably Is 0.30 mm or less.

According to the study by the present inventors, it has been found that the bonding strength with the resin member can be increased more than the conventional standard by providing a specific roughened layer described later on the surface of the stainless steel metal member.
However, when such a metal resin composite having excellent bonding strength is exposed to a high temperature for a long time, the resin member side thermally shrinks, so it is clear that the size of the metal resin composite changes due to the heat shrinkage stress. became. In addition, when the bonding strength between the resin member and the stainless steel metal member is strong, even if the resin member side is thermally contracted, the resin member and the stainless steel metal member do not peel off, so that the resin member and the stainless steel metal member may be deformed to the stainless steel metal member side. Became clear.
Based on the above findings, the present inventors have studied to improve the elastic modulus and mechanical strength of the resin member in order to suppress the dimensional change of the metal resin composite at a high temperature.
However, merely increasing the elastic modulus and mechanical strength of the resin member cannot sufficiently suppress the dimensional change of the metal resin composite at a high temperature.

Therefore, the present inventors have further intensively studied a design guideline for realizing a metal resin composite excellent in dimensional stability at high temperatures. As a result, the inventors have found that the measure of the warpage change rate of the thermosetting resin composition devised by the present inventors is effective as such a design guideline, and reached the present invention.
Here, the warpage change rate represents an index of expansion and contraction stress of the thermosetting resin composition. The more the warp change rate is positively increased, the stronger the contraction stress is, and the stronger the force for deforming the stainless steel metal member is. On the other hand, the more negative the warp change rate, the stronger the expansion stress.
Therefore, a thermosetting resin composition having a warpage change rate within the above range has an appropriate expansion / contraction stress and a low ability to deform a stainless steel metal member. Therefore, a thermosetting resin composition having a warpage change rate within the above range can realize a metal resin composite having excellent dimensional stability at high temperatures.

  The warpage change rate of the thermosetting resin composition can be controlled by appropriately adjusting the type and blending ratio of each component constituting the thermosetting resin composition (P). In the present embodiment, it is possible to adjust the warpage change rate by appropriately selecting the type and blending ratio of the thermosetting resin (A), the filler (B), and the shrinkage inhibitor (C).

  Hereinafter, the configuration of the metal resin composite 100 will be described in detail.

<Stainless steel metal member 102>
Hereinafter, the stainless steel metal member 102 will be described.

FIG. 3 is a schematic diagram for explaining an example of a cross-sectional shape of the recess 201 constituting the roughened layer 104 on the surface of the stainless steel metal member 102 according to the embodiment of the present invention.
From the viewpoint of improving the bonding strength with the resin member 101, the stainless steel metal member 102 preferably has a roughened layer 104 made of fine irregularities on the bonding surface 103 thereof. Here, the roughened layer 104 refers to a region having a plurality of recesses 201 provided on the surface of the stainless steel metal member 102.
The thickness of the roughened layer 104 is preferably 3 μm or more and 40 μm or less, more preferably 4 μm or more and 32 μm or less, and particularly preferably 4 μm or more and 30 μm or less. When the thickness of the roughened layer 104 is within the above range, the bonding strength with the resin member 101 can be further improved. Here, in this embodiment, the thickness of the roughening layer 104 represents the depth D3 of the largest depth among the plurality of recesses 201, and can be calculated from an electron microscope (SEM) photograph.

It is preferable that the cross section of the recess 201 has a shape having a cross section width D2 larger than the cross section width D1 of the opening 203 in at least a part between the opening 203 and the bottom 205 of the recess 201.
As shown in FIG. 3, the cross-sectional shape of the recess 201 is not particularly limited as long as D2 is larger than D1, and can take various shapes. The cross-sectional shape of the recess 201 can be observed with, for example, an electron microscope (SEM).

When the cross-sectional shape of the recess 201 is the above-described shape, the reason why the metal resin composite 100 that is more excellent in the bonding strength is not necessarily clear, but the surface of the bonding surface 103 is formed of the resin member 101 and the stainless steel metal member 102. This is thought to be because the anchor effect between the two is more strongly expressed.
When the cross-sectional shape of the concave portion 201 is the above shape, the resin member 101 is caught between the opening 203 and the bottom portion 205 of the concave portion 201, so that the anchor effect works effectively. Therefore, it is considered that the bonding strength between the resin member 101 and the stainless steel metal member 102 is improved.

The average depth of the recess 201 is preferably 0.5 μm or more and 40 μm or less, and more preferably 1 μm or more and 30 μm or less. When the average depth of the recess 201 is equal to or less than the above upper limit value, the thermosetting resin composition (P) can sufficiently enter the depth of the recess 201, so that the resin member 101 and the stainless steel metal member 102 are mutually It is possible to further improve the mechanical strength of the region that has penetrated into. If the average depth of the recess 201 is equal to or greater than the above lower limit value, the ratio of the filler (B) present in the recess 201 can be increased, so that the resin member 101 and the stainless steel metal member 102 penetrate each other. The mechanical strength of the region can be improved. Therefore, when the average depth of the recesses 201 is within the above range, the bonding strength with the resin member 101 can be further improved.
The average depth of the recess 201 can be measured from a scanning electron microscope (SEM) photograph as follows, for example. First, a cross section of the roughened layer 104 is photographed with a scanning electron microscope. From the observation image, 50 concave portions 201 are arbitrarily selected and their depths are measured. The average depth is obtained by integrating all the depths of the recesses 201 and dividing the sum by the number.

The average cross-sectional width of the opening 203 of the recess 201 is preferably 2 μm or more and 60 μm or less, more preferably 3 μm or more and 50 μm or less, and further preferably 3 μm or more and 30 μm or less. When the average cross-sectional width of the opening 203 is not more than the above upper limit value, the anchor effect between the resin member 101 and the stainless steel metal member 102 can be expressed more strongly. If the average cross-sectional width of the opening 203 is equal to or greater than the above lower limit value, the ratio of the filler (B) present in the recess 201 can be increased, so that the resin member 101 and the stainless steel metal member 102 are mutually The mechanical strength of the intruded area can be improved. Therefore, when the average cross-sectional width of the opening 203 is within the above range, the bonding strength with the resin member 101 can be further improved.
The average cross-sectional width of the opening 203 can be measured from an SEM photograph as follows, for example. First, a cross section of the roughened layer 104 is photographed with a scanning electron microscope. From the observation image, 50 concave portions 201 are arbitrarily selected, and their cross-sectional widths D1 are measured. The average cross-sectional width is obtained by integrating all the cross-sectional widths D1 of the openings 203 and dividing the sum by the number.

The surface roughness Ra of the joining surface 103 of the stainless steel metal member 102 is preferably 0.5 μm or more and 40.0 μm or less, more preferably 1.0 μm or more and 20.0 μm or less, and particularly preferably 1.0 μm or more. 10.0 μm or less. When the surface roughness Ra is within the above range, the bonding strength with the resin member 101 can be further improved.
Moreover, the maximum height Rz of the joining surface 103 of the stainless steel metal member 102 is preferably 1.0 μm or more and 40.0 μm or less, and more preferably 3.0 μm or more and 30.0 μm or less. When the maximum height Rz is within the above range, the bonding strength with the resin member 101 can be further improved. Ra and Rz can be measured according to JIS-B0601.

  In the stainless steel metal member 102, the ratio of the actual surface area by the nitrogen adsorption BET method to the apparent surface area of the joint surface 103 to be joined to at least the resin member 101 (hereinafter also simply referred to as specific surface area) is preferably 100 or more. Preferably it is 150 or more. When the specific surface area is equal to or greater than the lower limit, the bonding strength with the resin member 101 can be further improved. The specific surface area is preferably 400 or less, more preferably 380 or less, and particularly preferably 300 or less. When the specific surface area is not more than the upper limit, the bonding strength with the resin member 101 can be further improved.

Here, the apparent surface area in the present embodiment means a surface area when it is assumed that the surface of the stainless steel metal member 102 is smooth without unevenness. For example, when the surface shape is a rectangle, it is represented by vertical length × horizontal length. On the other hand, the actual surface area by the nitrogen adsorption BET method in the present embodiment means the BET surface area obtained from the adsorption amount of nitrogen gas. For example, using a specific surface area / pore distribution measurement device (BELSORPmini II, manufactured by Nippon Bell Co., Ltd.) for a vacuum dried sample to be measured, the nitrogen adsorption / desorption amount at liquid nitrogen temperature is measured, and based on the nitrogen adsorption / desorption amount Can be calculated.
When the specific surface area is within the above range, the reason why the metal-resin composite 100 having further excellent bonding strength can be obtained is not clear, but the surface of the bonding surface 103 with the resin member 101 is the same as that of the resin member 101. This is probably because the anchor effect between the stainless steel metal member 102 and the stainless steel metal member 102 can be expressed more strongly.
When the specific surface area is equal to or greater than the lower limit, the contact area between the resin member 101 and the stainless steel metal member 102 is increased, and the area where the resin member 101 and the stainless steel metal member 102 enter each other increases. As a result, the area where the anchor effect works increases, and it is considered that the bonding strength between the resin member 101 and the stainless steel metal member 102 is further improved.
On the other hand, if the specific surface area is too large, the ratio of the stainless steel metal member 102 in the region where the resin member 101 and the stainless steel metal member 102 have entered each other decreases, so that the mechanical strength of this region decreases. Therefore, when the specific surface area is less than or equal to the upper limit value, the mechanical strength of the region where the resin member 101 and the stainless steel metal member 102 have entered each other is further improved. As a result, the resin member 101 and the stainless steel metal It is considered that the bonding strength with the member 102 can be further improved.
From the above, when the specific surface area is within the above range, the surface of the joint surface 103 with the resin member 101 can exhibit an anchor effect between the resin member 101 and the stainless steel metal member 102 more strongly. It is assumed that the structure is good.

The stainless steel metal member 102 is not particularly limited, but the glossiness of at least the joint surface 103 to be joined to the resin member 101 is preferably 0.1 or more, more preferably 0.5 or more, and even more preferably 1. That's it. When the gloss is equal to or higher than the lower limit, the bonding strength with the resin member 101 can be further improved. Further, the glossiness is preferably 30 or less, more preferably 20 or less. When the glossiness is less than or equal to the upper limit, the bonding strength with the resin member 101 can be further improved. Here, the glossiness in the present embodiment indicates a value at a measurement angle of 60 ° measured according to ASTM-D523. The glossiness can be measured using, for example, a digital glossiness meter (20 °, 60 °) (GM-26 type, manufactured by Murakami Color Research Laboratory Co., Ltd.).
When the glossiness is within the above range, the reason why the metal resin composite 100 having better bonding strength is not necessarily clear, but the surface of the bonding surface 103 with the resin member 101 has a more messy structure. This is probably because the anchor effect between the resin member 101 and the stainless steel metal member 102 can be expressed more strongly.

The stainless steel metal material constituting the stainless steel metal member 102 is not particularly limited as long as it is a metal belonging to the category of stainless steel metal. For example, ferritic stainless steel, martensitic stainless steel, austenitic stainless steel, austenitic / ferritic duplex stainless steel, precipitation hardened stainless steel, and the like.
Examples of ferritic stainless steel include SUS430, SUS430LX, and SUS405. Examples of martensitic stainless steel include SUS403 and SUS420. Examples of the austenitic stainless steel include SUS201, SUS202, SUS301, SUS302, SUS303, SUS304, SUS305, SUS316, and SUS317. Examples of the austenitic / ferritic duplex stainless steel include SUS329J1. Examples of the precipitation hardening stainless steel include SUS630.

The shape of the stainless steel metal member 102 is not particularly limited as long as it has a joint surface 103 that joins the resin member 101. For example, the stainless steel metal member 102 has a sheet shape, a flat plate shape, a curved plate shape, a rod shape, a cylindrical shape, a lump shape, and the like. be able to. Moreover, the structure which consists of these combination may be sufficient. The stainless steel metal member 102 having such a shape can be obtained by processing the above-described stainless steel metal material by a known processing method.
Moreover, the shape of the joint surface 103 joined to the resin member 101 is not particularly limited, and examples thereof include a flat surface and a curved surface.

  The thickness of the stainless steel metal member 102 is not particularly limited because it is appropriately set depending on the use of the metal resin composite 100, but is usually 0.01 mm or more, preferably 0.1 mm or more. The upper limit value of the thickness of the stainless steel metal member 102 is not particularly limited, but is, for example, 50 mm or less.

Next, a method for forming the roughened layer 104 on the surface of the stainless steel metal member 102 will be described.
The roughened layer 104 can be formed, for example, by chemically treating the surface of the stainless steel metal member 102 using a surface treatment agent.
Here, the chemical treatment of the surface of the stainless steel metal member 102 using the surface treatment agent itself has been performed in the prior art. However, the present inventors have (1) a combination of a stainless steel metal member and a surface treatment agent, (2) temperature and time of chemical treatment, (3) post-treatment of the stainless steel metal member surface after chemical treatment, It has been found that the roughened layer 104 excellent in the bonding property with the resin member 101 can be obtained by controlling the factors such as the above. In order to obtain the roughened layer 104 that can further improve the bonding strength with the resin member 101, it is particularly important to control these factors to a high degree.
Hereinafter, an example of a method for forming the roughened layer 104 on the surface of the stainless steel metal member 102 will be described. However, the method for forming the roughened layer 104 according to the present embodiment is not limited to the following example.

First, (1) a surface treatment agent is selected.
As the surface treatment agent, it is preferable to select an aqueous solution in which an inorganic acid, a chlorine ion source, a cupric ion source, and a thiol compound are combined as necessary.

Next, (2) the stainless steel metal member is immersed in a surface treatment agent, and the stainless steel metal member surface is chemically treated. At this time, the processing temperature is, for example, 30 ° C. Moreover, although processing time is suitably determined by the material and surface state of a stainless steel metal member to select, the kind and density | concentration of surface treating agent, processing temperature, etc., it is 30 to 300 seconds, for example. At this time, it is important that the etching amount in the depth direction of the stainless steel metal member is preferably 3 μm or more, more preferably 5 μm or more. The etching amount in the depth direction of the stainless steel metal member can be evaluated by calculating from the weight, specific gravity and surface area of the dissolved stainless steel metal member. The etching amount in the depth direction can be adjusted by the type and concentration of the surface treatment agent, the treatment temperature, the treatment time, and the like.
In the present embodiment, the thickness of the roughened layer 104, the average depth of the concave portion 201, the specific surface area, the glossiness, Ra, Rz, and the like can be adjusted by adjusting the etching amount in the depth direction.

Finally, (3) post-treatment is performed on the surface of the stainless steel metal member after chemical treatment. First, the surface of the stainless steel metal member is washed with water and dried. Next, the surface of the stainless steel metal member subjected to chemical treatment is treated with an aqueous nitric acid solution or the like as necessary.
By the above procedure, the stainless steel metal member 102 having the roughened layer 104 according to this embodiment can be obtained.

<Resin member>
Next, the resin member 101 according to the present embodiment will be described.
The resin member 101 is formed by curing a thermosetting resin composition (P) containing a thermosetting resin (A) and a filler (B).

(Thermosetting resin composition (P))
Next, the thermosetting resin composition (P) will be described.
The thermosetting resin composition (P) is, for example, in the form of powder, granules, or tablets.
Examples of the thermosetting resin (A) include phenol resin, epoxy resin, unsaturated polyester resin, diallyl phthalate resin, melamine resin, oxetane resin, maleimide resin, urea (urea) resin, polyurethane resin, silicone resin, and benzoxazine. A resin having a ring, a cyanate ester resin, or the like is used. These may be used alone or in combination of two or more.
Among these, phenol resins that are excellent in heat resistance, workability, mechanical properties, electrical properties, adhesion, and wear resistance are preferably used.
The content of the thermosetting resin (A) is preferably 10% by mass or more and 43% by mass or less, more preferably 15%, when the total solid content of the thermosetting resin composition (P) is 100% by mass. The content is not less than 38% by mass and more preferably not less than 15% by mass and less than 30% by mass.

Examples of the phenolic resin include novolak-type phenolic resins such as phenol novolak resin, cresol novolak resin, and bisphenol A type novolak resin; Examples thereof include resol type phenol resins such as oil-melted resol phenol resin; aryl alkylene type phenol resins and the like. These may be used alone or in combination of two or more.
Among these, a novolak type phenol resin is preferable because it is easily available, inexpensive, and has good workability by roll kneading.

  In the above phenol resin, when a novolac type phenol resin is used, hexamethylenetetramine is usually used as a curing agent. Although hexamethylenetetramine is not particularly limited, it is preferably used in an amount of 10 to 25 parts by weight, more preferably 13 to 20 parts by weight, based on 100 parts by weight of the novolak type phenol resin. When the amount of hexamethylenetetramine used is not less than the above lower limit, the curing time during molding can be shortened. Moreover, the external appearance of a molded article can be improved as the usage-amount of hexamethylenetetramine is below the said upper limit.

The thermosetting resin composition (P) contains the filler (B) from the viewpoint of improving the mechanical strength of the resin member 101. However, in this embodiment, the shrinkage inhibitor (D) described later is excluded from the filler (B).
The content of the filler (B) is preferably 55% by mass or more and 85% by mass or less, more preferably 60% by mass, when the total solid content of the thermosetting resin composition (P) is 100% by mass. It is 80 mass% or less, More preferably, it is 65 mass% or more and 75 mass% or less. By making the content of the filler (B) within the above range, it is possible to further improve the mechanical strength of the obtained resin member 101 while improving the workability of the thermosetting resin composition (P). it can. As a result, a metal resin composite 100 that is more excellent in the bonding strength between the resin member 101 and the stainless steel metal member 102 can be obtained. Further, by adjusting the type and content of the filler (B), it is possible to adjust the value of the linear expansion coefficient of the resulting resin member 101 alpha _R.

  Examples of the filler (B) include a fibrous filler, a granular filler, and a plate-like filler. Here, the fibrous filler is a filler whose shape is fibrous. The plate-like filler is a filler whose shape is plate-like. The granular filler is a filler having a shape other than a fibrous filler or a plate-like filler including an indefinite shape.

  Examples of the fibrous filler include glass fiber, carbon fiber, asbestos fiber, metal fiber, wollastonite, attapulgite, sepiolite, rock wool, aluminum borate whisker, potassium titanate fiber, calcium carbonate whisker, and titanium oxide whisker. And fibrous inorganic fillers such as ceramic fibers; and fibrous organic fillers such as aramid fibers, polyimide fibers, and polyparaphenylene benzobisoxazole fibers. These may be used alone or in combination of two or more.

  Examples of the plate-like filler and granular filler include talc, kaolin clay, calcium carbonate, zinc oxide, calcium silicate hydrate, mica, glass flakes, glass beads, magnesium carbonate, silica, titanium oxide, Alumina, aluminum hydroxide, magnesium hydroxide, barium sulfate, calcium sulfate, calcium sulfite, zinc borate, barium metaborate, aluminum borate, calcium borate, sodium borate, aluminum nitride, boron nitride, silicon nitride, the above fibers For example, a pulverized product of a filler. These may be used alone or in combination of two or more.

The filler (B) preferably has an average particle size of 0.1 μm or more in a weight-based particle size distribution measured by a laser diffraction / scattering particle size distribution measurement method. Thereby, the mechanical strength of the resin member 101 obtained can be further improved while improving the workability of the thermosetting resin composition (P). Although the upper limit of the average particle diameter of a filler (B) is not specifically limited, For example, it is 100 micrometers or less.
The filler (B) more preferably includes a fibrous filler or a plate-like filler having an average major axis of 5 μm to 50 mm and an average aspect ratio of 1 to 1000.
The average major axis and average aspect ratio of the filler (B) can be measured from the SEM photograph as follows, for example. First, a plurality of fibrous fillers or plate-like fillers are photographed with a scanning electron microscope. From the observation image, 50 fibrous fillers or plate-like fillers are arbitrarily selected, and their major diameters (fiber length in the case of fibrous fillers, planar major dimension in the case of plate-like fillers) and The short diameter (in the case of a fibrous filler, the fiber diameter, in the case of a plate-like filler, the dimension in the thickness direction) is measured. The average major axis is obtained by integrating all major axes and dividing by the number. Similarly, the average minor axis is obtained by integrating all minor axes and dividing by the number. The average major axis with respect to the average minor axis is defined as the average aspect ratio.

  As filler (B), wollastonite, kaolin clay, talc, mica, glass beads, titanium oxide, alumina, silica, calcium carbonate, aluminum hydroxide, magnesium hydroxide, barium sulfate, calcium sulfate, calcium sulfite, boric acid One or more selected from the group consisting of zinc, barium metaborate, aluminum borate, calcium borate, sodium borate, aluminum nitride, boron nitride, silicon nitride, carbon fiber, and glass fiber are preferred, glass fiber, One or more selected from the group consisting of carbon fiber, glass beads, calcium carbonate, wollastonite, silica, and kaolin clay are more preferable. When such a filler (B) is used, the mechanical strength of the resin member 101 can be particularly improved.

  Further, the filler (B) may be subjected to a surface treatment with a coupling agent such as a silane coupling agent (C) described later.

  The thermosetting resin composition (P) may further contain a silane coupling agent (C). By including the silane coupling agent (C), the adhesion to the stainless steel metal member 102 can be improved. Further, by including the silane coupling agent (C), the affinity between the thermosetting resin (A) and the filler (B) is improved, and as a result, the mechanical strength of the resin member 101 is further improved. be able to.

  The content of the silane coupling agent (C) is not particularly limited because it depends on the specific surface area of the filler (B), but is preferably 0.01 parts by mass or more and 4 parts by mass with respect to 100 parts by mass of the filler (B). 0.0 part by mass or less, and more preferably 0.1 part by mass or more and 1.0 part by mass or less. When the content of the silane coupling agent (C) is within the above range, the mechanical strength of the resin member 101 can be further improved while sufficiently covering the filler (B).

Examples of the silane coupling agent (C) include epoxy groups such as γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, and β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane. -Containing alkoxysilane compounds; mercapto group-containing alkoxysilane compounds such as γ-mercaptopropyltrimethoxysilane and γ-mercaptopropyltriethoxysilane; γ-ureidopropyltriethoxysilane, γ-ureidopropyltrimethoxysilane, γ- (2- Ureido group-containing alkoxysilane compounds such as ureidoethyl) aminopropyltrimethoxysilane; γ-isocyanatopropyltriethoxysilane, γ-isocyanatopropyltrimethoxysilane, γ-isocyanatopropylmethyldimethoxy Isocyanato group-containing alkoxysilane compounds such as silane, γ-isocyanatopropylmethyldiethoxysilane, γ-isocyanatopropylethyldimethoxysilane, γ-isocyanatopropylethyldiethoxysilane, γ-isocyanatopropyltrichlorosilane; γ-amino Amino group-containing alkoxysilane compounds such as propyltriethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane; Examples thereof include hydroxyl group-containing alkoxysilane compounds such as -hydroxypropyltrimethoxysilane and γ-hydroxypropyltriethoxysilane.
These may be used alone or in combination of two or more.

The thermosetting resin composition (P) preferably contains a shrinkage inhibitor (D) from the viewpoint of suppressing thermal shrinkage of the resin member 101. However, in this embodiment, the filler (B) described above is excluded from the shrinkage inhibitor (D).
The content of the shrinkage inhibitor (D) is preferably 0.5% by mass or more and 10% by mass or less, and more preferably when the total solid content of the thermosetting resin composition (P) is 100% by mass. It is 1 mass% or more and 8 mass% or less. By setting the content of the shrinkage inhibitor (D) to the upper limit value or less, the thermal expansion of the resin member 101 can be further suppressed. By making content of a shrinkage | contraction inhibitor (D) more than the said lower limit, the thermal contraction of the resin member 101 can be suppressed further.

The shrinkage inhibitor (D) is not particularly limited as long as it has a large thermal expansion coefficient and can suppress the thermal shrinkage of the resin member 101. For example, acrylonitrile / butadiene rubber, unmodified polyvinyl acetate, carboxylic acid-modified poly Elastomers such as vinyl acetate, polyvinyl butyral, natural rubber, isoprene rubber, styrene / butadiene rubber, butadiene rubber, chloroprene rubber, butyl rubber, ethylene / propylene rubber, acrylic rubber, styrene / isoprene rubber, urethane rubber, silicone rubber, fluorine rubber, etc. Can be mentioned. These may be used alone or in combination of two or more.
The reason why the shrinkage can be suppressed is not necessarily clear, but it is considered that these compounds suppress the shrinkage by being incorporated into the crosslinked structure of the resin. Among these, acrylonitrile / budadiene rubber, unmodified polyvinyl acetate, and carboxylic acid-modified polyvinyl acetate are preferable, and carboxylic acid-modified polyvinyl acetate is particularly preferable. Carboxylic acid-modified polyvinyl acetate reacts with the thermosetting resin (A) such as phenol resin to reflect the characteristics of polyvinyl acetate more, so acrylonitrile / budadiene rubber, unmodified polyvinyl acetate, etc. It is considered that the resin member 101 has a superior heat shrinkage suppressing power compared to the above.

  The manufacturing method of a thermosetting resin composition (P) is not specifically limited, Generally, it can manufacture by a well-known method. For example, the following method is mentioned. First, thermosetting resin (A), filler (B), if necessary, silane coupling agent (C), shrinkage inhibitor (D), curing agent, curing aid, release agent, pigment, flame retardant In addition, a weathering agent, an antioxidant, a plasticizer, a lubricant, a sliding agent, a foaming agent and the like are blended and mixed uniformly. Next, the obtained mixture is heated and melt-kneaded by a kneading apparatus such as a roll, a kneader, a twin-screw extruder alone, or a combination of a roll and another kneading apparatus. Finally, the thermosetting resin composition (P) is obtained by granulating or pulverizing the obtained mixture.

The linear expansion coefficient α _R in the range from 25 ° C. to the glass transition temperature of the resin member 101 is preferably 5 ppm / ° C. or more and 25 ppm / ° C. or less, more preferably 10 ppm / ° C. or more and 20 ppm / ° C. or less. When the linear expansion coefficient α _R is within the above range, the reliability of the temperature cycle of the metal resin composite 100 can be further improved.

Moreover, when the resin member 101 is a sheet form, the linear expansion coefficient α _R in the range from 25 ° C. to the glass transition temperature of the resin member 101 and the linear expansion coefficient α _{R1 in} the flow direction (MD) and the direction perpendicular to the MD ( The absolute value of the difference (α _R1 −α _R2 ) from the linear expansion coefficient α _R2 of TD) is preferably 10 ppm / ° C. or less, more preferably 8 ppm / ° C. or less. If the difference in the linear expansion coefficient is not more than the above upper limit value, distortion and warpage generated in the resin member 101 can be reduced, and as a result, the dimensional stability at a high temperature of the resulting metal resin composite 100 can be further improved. Can do.

  The thickness of the resin member 101 is not particularly limited because it is appropriately set depending on the use of the metal resin composite 100, but is usually 0.05 mm or more, preferably 0.1 mm or more. The upper limit value of the thickness of the resin member 101 is not particularly limited, but is, for example, 50 mm or less.

<Metal resin composite>
Next, the metal resin composite 100 according to the present embodiment will be described.
The metal resin composite 100 includes a resin member 101 and a stainless steel metal member 102 joined to the resin member 101.

The metal-resin composite 100 has a linear expansion coefficient α _R in the range from 25 ° C. to the glass transition temperature of the resin member 101, and a line in the range from 25 ° C. of the stainless metal member 102 to the glass transition temperature of the resin member 101. The absolute value of the difference from the expansion coefficient α _M (α _R −α _M ) is preferably 15 ppm / ° C. or less, more preferably 10 ppm / ° C. or less, and further preferably 5 ppm / ° C. or less. If the difference in the linear expansion coefficient is less than or equal to the upper limit, thermal stress due to the difference in linear expansion that occurs when the metal resin composite 100 is exposed to a high temperature can be suppressed. Therefore, if the difference in the linear expansion coefficient is equal to or less than the upper limit value, the bonding strength between the resin member 101 and the stainless steel metal member 102 can be maintained even at a high temperature. That is, if the difference in the linear expansion coefficient is not more than the upper limit value, the dimensional stability of the metal resin composite 100 at a high temperature can be further improved.
In the present embodiment, when the linear expansion coefficient has anisotropy, an average value thereof is represented. For example, when the resin member 101 is in the form of a sheet, when the linear expansion coefficient in the flow direction (MD) is different from the linear expansion coefficient in the vertical direction (TD), the average value thereof is the linear expansion coefficient α of the resin member 101. _R.

The metal resin composite 100 is not particularly limited, but it is preferable that the resin member 101 and the stainless steel metal member 102 are joined without an adhesive. The resin member 101 and the stainless steel metal member 102 have excellent bonding strength even without an adhesive. Therefore, the manufacturing process of the metal resin composite 100 can be simplified.
Here, the adhesive refers to an adhesive known in the technical field of metal resin composites, and examples thereof include an epoxy adhesive.

  The total thickness of the metal resin composite 100 is not particularly limited because it is appropriately set depending on the use of the metal resin composite 100, but is usually 0.06 mm or more, preferably 0.2 mm or more. Although the upper limit of the thickness of the metal resin composite 100 is not particularly limited, for example, it is 100 mm or less.

<Method for producing metal resin composite>
Next, a method for manufacturing the metal resin composite 100 will be described. Although it does not specifically limit as a manufacturing method of the metal resin composite 100, For example, the injection molding method, the transfer molding method, the compression molding method, the injection compression molding method etc. are mentioned. Of these, the injection molding method is particularly suitable.

The manufacturing method of the metal resin composite 100 includes, for example, the following steps.
(1) Step of installing a stainless steel metal member 102 having a roughened layer 104 on at least a bonding surface 103 to be bonded to the resin member 101 in the mold 105 (2) A thermosetting resin composition ( P) is injected, and the thermosetting resin composition (P) is cured in a state where at least a part of the thermosetting resin composition (P) is in contact with the bonding surface 103, whereby the thermosetting resin composition ( Step of joining resin member 101 made of P) and stainless steel metal member 102

As mentioned above, although embodiment of this invention was described, these are illustrations of this invention and various structures other than the above are also employable.
Hereinafter, an example of a reference form of the present invention will be shown.
<1>
Of the metal resin composite comprising a resin member and a stainless steel metal member joined to the resin member, a thermosetting resin composition used for forming the resin member,
A thermosetting resin;
Filling material,
Including
Using a molding machine, the thermosetting resin composition has a thickness of 1 mm and a maximum height (Rz) of 15 ± 1 μm under the conditions of an effective pressure of 20 MPa, a mold temperature of 175 ° C., and a curing time of 3 minutes. The sheet-like metal resin composite having a length of 80 mm, a width of 10 mm, and a thickness of 4 mm is produced by injection molding into a mold in which a stainless steel sheet is placed. Thereafter, the sheet-like metal resin composite is 150 ° C. When stored for 250 hours,
Using a temperature-variable laser three-dimensional measuring machine, the distance from the laser head is the longest distance when the laser is perpendicularly applied to the surface of the sheet-like metal resin composite on the stainless steel sheet side. The difference between the far point and the closest point from the laser head is defined as the amount of warpage,
The amount of warpage before storage is X1,
When the amount of warpage after storage is X2,
In the sheet-like metal resin composite after the storage, the resin member made of the thermosetting resin composition and the stainless steel sheet maintain a bonded state,
The thermosetting resin composition whose curvature change rate calculated by (X2-X1) / X1 * 100 is -35% or more and 35% or less.
<2>
In the thermosetting resin composition as described in <1>,
The linear expansion coefficient α _R in the range from 25 ° C. to the glass transition temperature of the resin member in the sheet-like metal resin composite, and in the range from 25 ° C. of the stainless steel sheet to the glass transition temperature of the resin member. absolute value is not more than 15 ppm / ° C., the thermosetting resin composition of the difference between the linear expansion coefficient _{α M (α R -α M)} .
<3>
In the thermosetting resin composition according to <1> or <2>,
The linear expansion coefficient α _{R1 in} the flow direction of the resin member and the linear expansion in the direction perpendicular to the linear expansion coefficient α _R in the range from 25 ° C. to the glass transition temperature of the resin member in the sheet-like metal resin composite. absolute value of the difference between the coefficient α _R2 (α _R1 -α _R2) is less than 10 ppm / ° C., the thermosetting resin composition.
<4>
In the thermosetting resin composition according to any one of <1> to <3>,
The thermosetting resin composition further includes a shrinkage inhibitor.
<5>
In the thermosetting resin composition as described in <4>,
A thermosetting resin composition, wherein the shrinkage inhibitor is one or more selected from the group consisting of acrylonitrile / butadiene rubber, unmodified polyvinyl acetate, and carboxylic acid-modified polyvinyl acetate.
<6>
In the thermosetting resin composition according to <4> or <5>,
The thermosetting resin composition whose content of the said shrinkage | contraction inhibitor is 0.5 mass% or more and 10 mass% or less when the total solid of the said thermosetting resin composition is 100 mass%.
<7>
<1> thru | or <6> In the thermosetting resin composition as described in any one,
The filler is wollastonite, kaolin clay, talc, mica, glass beads, titanium oxide, alumina, silica, calcium carbonate, aluminum hydroxide, magnesium hydroxide, barium sulfate, calcium sulfate, calcium sulfite, zinc borate, Thermosetting resin composition that is one or more selected from the group consisting of barium metaborate, aluminum borate, calcium borate, sodium borate, aluminum nitride, boron nitride, silicon nitride, carbon fiber, and glass fiber object.
<8>
In the thermosetting resin composition according to any one of <1> to <7>,
The thermosetting resin composition whose content of the said filler is 55 to 85 mass% when the total solid of the said thermosetting resin composition is 100 mass%.
<9>
In the thermosetting resin composition according to any one of <1> to <8>,
The thermosetting resin composition, wherein the thermosetting resin is a phenol resin.
<10>
In the thermosetting resin composition as described in <9>,
A thermosetting resin composition, wherein the phenol resin is one or more selected from the group consisting of a novolac-type phenol resin, a resol-type phenol resin, and an arylalkylene-type phenol resin.
<11>
<1> thru | or <10> A metal resin composite provided with the resin member which consists of a thermosetting resin composition as described in any one, and the stainless steel metal member joined to the said resin member.
<12>
In the metal resin composite according to <11>,
The said stainless steel metal member is a metal resin composite which has a roughening layer which consists of a fine unevenness | corrugation in the joining surface joined to the said resin member at least.
<13>
In the metal resin composite according to <12>,
The cross section of the concave portion constituting the concave and convex portions is a metal-resin composite having a shape having a cross sectional width larger than the cross sectional width of the opening portion in at least a part between the opening portion and the bottom portion of the concave portion.
<14>
<11> thru | or <13> In the metal resin composite as described in any one,
A metal resin composite, wherein the roughened layer has a thickness in the range of 3 μm to 40 μm.
<15>
In the metal resin composite according to any one of <11> to <14>,
Using a molding method selected from an injection molding method, a transfer molding method, a compression molding method, and an injection compression molding method, at least a part of the thermosetting resin composition contacts the joining surface of the stainless steel metal member A metal resin composite, which is obtained by curing the thermosetting resin composition in a state of being cured.

  The thermosetting resin composition (P) preferably has high fluidity in order to perform molding well. Therefore, the thermosetting resin composition (P) has a melt viscosity at 175 ° C. of preferably 10 Pa · s to 3000 Pa · s, and more preferably 30 Pa · s to 2000 Pa · s. The melt viscosity at 175 ° C. can be measured by, for example, a thermal fluidity evaluation apparatus (flow tester) manufactured by Shimadzu Corporation.

  In the present embodiment, the molding conditions of the metal resin composite 100 are not particularly limited because they vary depending on the molding method employed, but generally known molding conditions in the molding method employed can be employed. When an injection molding method is used as the molding method, for example, molding conditions of a temperature of 160 to 180 ° C., a pressure of 10 to 30 MPa, and a curing time of 30 seconds to 5 minutes can be given.

(Use)
Since the metal resin composite 100 according to the present embodiment has high productivity and high degree of freedom in shape control, it can be developed for various uses. For example, it can be used for aircraft parts, automobile parts, electronic equipment parts, household appliance parts, industrial equipment parts, and the like. It is preferable that the metal resin composite body 100 according to the present embodiment is particularly used for automotive parts.

  As mentioned above, although embodiment of this invention was described, these are illustrations of this invention and various structures other than the above are also employable.

  Hereinafter, the present embodiment will be described in detail with reference to examples and comparative examples. In addition, this embodiment is not limited to description of these Examples at all.

Example 1
<Preparation of thermosetting resin composition (P1)>
21.0% by mass of novolac-type phenolic resin (PR-51305, manufactured by Sumitomo Bakelite Co., Ltd.), 3.5% by mass of hexamethylenetetramine, glass fiber (CS3E479, manufactured by Nittobo Co., Ltd., average particle size: 11 μm, average major axis: 3mm, average aspect ratio: 270) 20.0% by mass, wollastonite (manufactured by NYCO Minerals, product name: NYAD325, average particle size: 10 μm) 30.0% by mass, fused silica (manufactured by ELKEM, product) Name: SIDISTAR, average particle size: 0.15 μm) is 20.0% by mass, carboxylic acid-modified polyvinyl acetate (manufactured by Denki Kagaku Kogyo Co., Ltd., product name: Denka ASR CH-09) is 2.0% by mass, γ -1.0 mass% of aminopropyltriethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KBE-903), magnesium oxide (Made by Kyowa Chemical Industry Co., Ltd., product name: Kyowamag 30) 0.4% by mass and 2.1% by mass of other components such as a lubricant were each dry-mixed and melt-kneaded with a 90 ° C. heating roll. Then, the cooled sheet was pulverized to obtain a granular thermosetting resin composition (P1).

(Viscosity characteristics of thermosetting resin composition (P1))
The melt viscosity of the thermosetting resin composition (P1) at 175 ° C. was measured using a thermal fluid property evaluation apparatus (Koka flow tester, CFT-500D).

<Surface treatment of stainless steel metal member>
Stainless steel sheet A (80 mm × 10 mm, thickness 1.0 mm, SUS304) was prepared as a stainless steel sheet that was not surface-treated.
An aqueous solution of sulfuric acid (50 mass%), cupric sulfate pentahydrate (3 mass%), potassium chloride (3 mass%), and thiosalicylic acid (0.0001 mass%) was prepared. In the obtained aqueous solution (30 ° C.), the stainless steel sheet A was immersed and swung, and dissolved in the depth direction by 15 μm (calculated from the reduced weight of stainless steel). Subsequently, it washed with water and dried and the stainless steel sheet 1 was obtained.

<Evaluation method of stainless steel metal member>
(Measurement of surface roughness of stainless steel metal parts)
The surface shape of the joint surface with the resin member of the stainless steel metal member at a magnification of 20 times was measured using an ultra-deep shape measuring microscope (VK9700 manufactured by Keyence Corporation). For the surface roughness, Ra and the maximum height Rz were measured. Ra and Rz were measured according to JIS-B0601.
Ra of the stainless steel sheet 1 was 2.5 μm, and Rz was 15.3 μm.

(Measurement of specific surface area)
The sample to be measured was vacuum-dried at 120 ° C. for 6 hours, and then the nitrogen adsorption / desorption amount at the liquid nitrogen temperature was measured using an automatic specific surface area / pore distribution measuring device (BELSORPmini II, manufactured by Nippon Bell Co., Ltd.). The actual surface area by the nitrogen adsorption BET method was calculated from the BET plot. The specific surface area was calculated by dividing the actual surface area measured by the nitrogen adsorption BET method by the apparent surface area.
The specific surface area of the stainless steel sheet 1 was 250.

(Measurement of surface gloss of stainless steel metal parts)
The glossiness of the surface of the stainless steel metal member is measured at a measurement angle of 60 according to ASTM-D523 using a digital gloss meter (20 °, 60 °) (GM-26, manufactured by Murakami Color Research Laboratory Co., Ltd.). Measured at °.
The glossiness of the stainless steel sheet 1 was 10.

(Observation of the surface of stainless steel metal members)
The surface of the stainless steel metal member was photographed with an electron microscope (SEM), and the structure of the roughened layer existing on the surface of the stainless steel metal member was observed. From the obtained SEM photograph, the thickness of the roughened layer, the cross-sectional shape of the concave portion, the average depth of the concave portion, and the average cross-sectional width of the opening were determined.
The thickness of the roughened layer of the stainless steel sheet 1 was 15 μm, the average depth of the recesses was 13 μm, and the average cross-sectional width of the openings was 14 μm. Further, the cross section of the concave portion has a shape having a cross-sectional width larger than the cross-sectional width of the opening portion in at least a part between the opening portion and the bottom portion of the concave portion.

(Measurement of linear expansion coefficient α _M )
The linear expansion coefficient α _M in the range from 25 ° C. to the glass transition temperature of the resin member was measured under a compression condition of 5 ° C./min using a thermomechanical analyzer TMA (manufactured by TA Instruments, EXSTAR6000). The linear expansion coefficient α _M of the stainless steel sheet 1 was 17 ppm / ° C.

<Production of metal resin composite>
The metal resin composite 1 was produced using the obtained thermosetting resin composition (P1) and the stainless steel sheet 1. Specifically, it was produced by the following procedure.
First, a stainless steel sheet 1 having a thickness of 1 mm is placed in a mold. Next, the thermosetting resin composition (P1) is heated so that the thickness after curing is 3 mm, and a predetermined amount is injected into the mold. Finally, by curing the thermosetting resin composition (P1) by compression molding, a metal resin composite 1 that is a two-layer sheet of a resin member sheet having a thickness of 3 mm and a stainless sheet 1 having a thickness of 1 mm was obtained ( (Length 80mm, width 10mm, thickness 4mm). This metal resin composite 1 was used as a test piece 1. The compression molding conditions were an effective pressure of 20 MPa, a mold temperature of 175 ° C., and a curing time of 3 minutes.

(Bending strength)
The bending strength of the obtained test piece 1 was measured in an atmosphere at 25 ° C. according to JIS K 6911. At this time, the test was performed by placing the stainless steel sheet 1 on the lower side. Here, the unit of bending strength is “MPa”.

(Measurement of linear expansion coefficient α _R )
Using a thermomechanical analyzer TMA (manufactured by TA Instruments, EXSTAR6000), the linear expansion coefficient α _R in the range from 25 ° C. to the glass transition temperature of the resin member sheet was measured under compression conditions of 5 ° C./min. The linear expansion coefficient α _R of the resin member sheet having a thickness of 3 mm made of the thermosetting resin composition (P1) was 16 ppm / ° C. in the flow direction, 21 ppm / ° C. in the direction perpendicular thereto, and the average value was 18 ppm / ° C. It was. Therefore, the difference in linear expansion coefficient (α _R −α _M ) was 1 ppm / ° C.

(Curve change rate of metal resin composite)
Using a temperature variable laser three-dimensional measuring machine (LS200-MT100MT50: manufactured by Tetec Corp.), measurement was performed by applying a laser perpendicularly to the surface of the test piece 1 on the stainless steel sheet 1 side at 25 ° C. The difference between the farthest point farthest from the laser head and the nearest point closest to the laser head was taken as the amount of warpage. The number of samples was 5, and the average value was taken as the amount of warpage.
Next, the test piece 1 was stored at 150 ° C. for 250 hours. About the test piece 1 after storage, the amount of curvature was measured similarly.
Next, the warpage amount before storage was X1, the warpage amount after storage was X2, and the warpage change rate was calculated from the following equation.
Warpage change rate [%] = (X2−X1) / X1 × 100

(Example 2)
A metal resin composite 2 was produced in the same manner as in Example 1 except that the following thermosetting resin composition (P2) was used instead of the thermosetting resin composition (P1). This metal resin composite 2 was used as a test piece 2, and the same evaluation as in Example 1 was performed.
20.0% by mass of novolac type phenolic resin (PR-51305, manufactured by Sumitomo Bakelite Co., Ltd.), 3.5% by mass of hexamethylenetetramine, glass fiber (CS3E479, manufactured by Nittobo Co., Ltd., average particle size: 11 μm, average major axis: 3mm, average aspect ratio: 270) 20.0% by mass, wollastonite (manufactured by NYCO Minerals, product name: NYAD325, average particle size: 10 μm) 30.0% by mass, fused silica (manufactured by ELKEM, product) Name: SIDISTAR, average particle diameter: 0.15 μm) 20.0% by mass, carboxylic acid-modified polyvinyl acetate (manufactured by Denki Kagaku Kogyo Co., Ltd., product name: Denka ASR CH-09) 3.5% by mass, γ -1.0 mass% of aminopropyltriethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KBE-903), magnesium oxide (Made by Kyowa Chemical Industry Co., Ltd., product name: Kyowamag 30) 0.4% by mass and other components such as lubricants 1.6% by mass, each dry-mixed and melt-kneaded with a heating roll at 90 ° C. Then, the cooled sheet was pulverized to obtain a granular thermosetting resin composition (P2).

(Example 3)
A metal resin composite 3 was produced in the same manner as in Example 1 except that the following thermosetting resin composition (P3) was used instead of the thermosetting resin composition (P1). This metal resin composite 3 was used as a test piece 3 and evaluated in the same manner as in Example 1.
18.5% by mass of novolac type phenolic resin (PR-51305, manufactured by Sumitomo Bakelite Co., Ltd.), 3.5% by mass of hexamethylenetetramine, glass fiber (CS3E479, manufactured by Nittobo Co., Ltd., average particle size: 11 μm, average major axis: 3mm, average aspect ratio: 270) 20.0% by mass, wollastonite (manufactured by NYCO Minerals, product name: NYAD325, average particle size: 10 μm) 30.0% by mass, fused silica (manufactured by ELKEM, product) Name: SIDISTAR, average particle size: 0.15 μm) is 20.0% by mass, carboxylic acid-modified polyvinyl acetate (manufactured by Denki Kagaku Kogyo Co., Ltd., product name: Denka ASR CH-09) is 5.0% by mass, γ -1.0 mass% of aminopropyltriethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KBE-903), magnesium oxide (Made by Kyowa Chemical Industry Co., Ltd., product name: Kyowamag 30) 0.4% by mass and other components such as lubricants 1.6% by mass, each dry-mixed and melt-kneaded with a heating roll at 90 ° C. Then, the cooled sheet was pulverized to obtain a granular thermosetting resin composition (P3).

Example 4
A metal resin composite 4 was produced in the same manner as in Example 1 except that the following thermosetting resin composition (P4) was used instead of the thermosetting resin composition (P1). This metal resin composite 4 was used as a test piece 4 and evaluated in the same manner as in Example 1.
Resol type phenolic resin (Sumitomo Bakelite, PR-513723) 18.0% by mass, novolac type phenolic resin (PR-51305, manufactured by Sumitomo Bakelite) 5.0% by mass, glass fiber (CS3E479, Nittobo) Manufactured, average particle size: 11 μm, average major axis: 3 mm, average aspect ratio: 270) 20.0% by mass, wollastonite (manufactured by NYCO Minerals, product name: NYAD325, average particle size: 10 μm) is 30.0. 20.0% by mass of fused silica (ELKEM, product name: SIDISSTAR, average particle size: 0.15 μm), carboxylic acid-modified polyvinyl acetate (manufactured by Denki Kagaku Kogyo, product name: DENKA ASR CH) -09) 2.0% by mass, γ-aminopropyltriethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KB) E-903) is 1.0% by mass, curing aid (slaked lime) is 1.0% by mass, other components such as lubricants are 3.0% by mass, and each is dry-mixed, and this is heated at 90 ° C. The mixture was melt-kneaded and then cooled in a sheet form to obtain a granular thermosetting resin composition (P4).

(Example 5)
A metal resin composite 5 was produced in the same manner as in Example 1 except that the following thermosetting resin composition (P5) was used instead of the thermosetting resin composition (P1). The metal resin composite 5 was used as a test piece 5 and the same evaluation as in Example 1 was performed.
21.0% by mass of novolac-type phenolic resin (PR-51305, manufactured by Sumitomo Bakelite Co., Ltd.), 3.5% by mass of hexamethylenetetramine, glass fiber (CS3E479, manufactured by Nittobo Co., Ltd., average particle size: 11 μm, average major axis: 3mm, average aspect ratio: 270) 20.0% by mass, wollastonite (manufactured by NYCO Minerals, product name: NYAD325, average particle size: 10 μm) 30.0% by mass, fused silica (manufactured by ELKEM, product) Name: SIDISTAR, average particle size: 0.15 μm) 20.0% by mass, polyvinyl acetate (manufactured by Denki Kagaku Kogyo Co., Ltd., product name: Sacnol SN-10) 2.0% by mass, γ-aminopropyltriethoxy 1.0% by mass of silane (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KBE-903), magnesium oxide (manufactured by Kyowa Chemical Industry Co., Ltd.) Product name: 0.4% by mass of Kyowamag 30) and 2.1% by mass of other components such as lubricants are dry-mixed, melted and kneaded with a heating roll at 90 ° C., and cooled into a sheet. The obtained product was pulverized to obtain a granular thermosetting resin composition (P5).

(Example 6)
A metal resin composite 6 was produced in the same manner as in Example 1 except that the following thermosetting resin composition (P6) was used instead of the thermosetting resin composition (P1). This metal resin composite 6 was used as a test piece 6 and evaluated in the same manner as in Example 1.
21.0% by mass of novolac-type phenolic resin (PR-51305, manufactured by Sumitomo Bakelite Co., Ltd.), 3.5% by mass of hexamethylenetetramine, glass fiber (CS3E479, manufactured by Nittobo Co., Ltd., average particle size: 11 μm, average major axis: 3mm, average aspect ratio: 270) 20.0% by mass, wollastonite (manufactured by NYCO Minerals, product name: NYAD325, average particle size: 10 μm) 30.0% by mass, fused silica (manufactured by ELKEM, product) Name: SIDISTAR, average particle size: 0.15 μm) is 20.0 mass%, acrylonitrile-butadiene rubber (manufactured by JSR, product name: PNC-38) is 2.0 mass%, γ-aminopropyltriethoxysilane ( 1.0% by mass of Shin-Etsu Chemical Co., Ltd., product name: KBE-903), magnesium oxide (Kyowa Chemical Industry) Manufactured and product name: Kyowamag 30) 0.4% by weight, and other components such as lubricant 2.1% by weight are dry-mixed, and melt-kneaded with a heating roll at 90 ° C. to form a sheet. The cooled product was pulverized to obtain a granular thermosetting resin composition (P6).

(Example 7)
A metal resin composite 7 was produced in the same manner as in Example 1 except that the following thermosetting resin composition (P7) was used instead of the thermosetting resin composition (P1). The metal resin composite 7 was used as a test piece 7, and the same evaluation as in Example 1 was performed.
21.0% by mass of novolac-type phenolic resin (PR-51305, manufactured by Sumitomo Bakelite Co., Ltd.), 3.5% by mass of hexamethylenetetramine, glass fiber (CS3E479, manufactured by Nittobo Co., Ltd., average particle size: 11 μm, average major axis: 30.0 mm, average aspect ratio: 270) 70.0% by mass, carboxylic acid-modified polyvinyl acetate (manufactured by Denki Kagaku Kogyo Co., Ltd., product name: Denka ASR CH-09) 2.0% by mass, γ-aminopropyltri 1.0% by mass of ethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KBE-903), 0.4% by mass of magnesium oxide (manufactured by Kyowa Chemical Industry Co., Ltd., product name: Kyowa Mug 30), other lubricants, etc. 2.1% by mass of the above components were each dry-mixed, melted and kneaded with a heating roll at 90 ° C., cooled into a sheet, and pulverized to form a granular heat Yield of resin composition (P7).

(Example 8)
A metal resin composite 8 was produced in the same manner as in Example 1 except that the following stainless steel sheet 2 was used instead of the stainless steel sheet 1. This metal resin composite 8 was used as a test piece 8, and the same evaluation as in Example 1 was performed.
An aqueous solution of sulfuric acid (50 mass%), cupric sulfate pentahydrate (3 mass%), potassium chloride (3 mass%), and thiosalicylic acid (0.0001 mass%) was prepared. In the obtained aqueous solution (30 ° C.), the stainless steel sheet A was immersed and rocked, and dissolved in the depth direction by 30 μm (calculated from the reduced weight of stainless steel). Subsequently, it washed with water and dried and the stainless steel sheet 2 was obtained.
The characteristics of the stainless steel sheet 2 were as follows.
Ra: 2.8 μm
Rz: 28.0 μm
Specific surface area: 280
Glossiness: 8
Roughening layer thickness: 30 μm
Average depth of recess: 28 μm
Average cross-sectional width of the opening: 5 μm
Linear expansion coefficient α _M : 17 ppm / ° C.
Further, the cross section of the concave portion has a shape having a cross-sectional width larger than the cross-sectional width of the opening portion in at least a part between the opening portion and the bottom portion of the concave portion.

Example 9
A metal resin composite 9 was produced in the same manner as in Example 1 except that the following stainless steel sheet 3 was used instead of the stainless steel sheet 1. This metal resin composite 9 was used as a test piece 9, and the same evaluation as in Example 1 was performed.
An aqueous solution of sulfuric acid (50 mass%), cupric sulfate pentahydrate (3 mass%), potassium chloride (3 mass%), and thiosalicylic acid (0.0001 mass%) was prepared. In the obtained aqueous solution (30 ° C.), the stainless steel sheet A was immersed and swung, and dissolved in the depth direction by 4 μm (calculated from the reduced weight of stainless steel). Subsequently, it washed with water and dried and the stainless steel sheet 3 was obtained.
The characteristics of the stainless steel sheet 3 were as follows.
Ra: 1.1 μm
Rz: 4.0 μm
Specific surface area: 165
Glossiness: 13
Roughening layer thickness: 4 μm
Average depth of recess: 3.7 μm
Average cross-sectional width of the opening: 3 μm
Linear expansion coefficient α _M : 17 ppm / ° C.
Further, the cross section of the concave portion has a shape having a cross-sectional width larger than the cross-sectional width of the opening portion in at least a part between the opening portion and the bottom portion of the concave portion.

(Comparative Example 1)
A metal resin composite 10 was produced in the same manner as in Example 1 except that the following thermosetting resin composition (P8) was used instead of the thermosetting resin composition (P1). This metal resin composite 10 was used as a test piece 10 and evaluated in the same manner as in Example 1.
22.0% by mass of novolac type phenolic resin (PR-51305, manufactured by Sumitomo Bakelite Co., Ltd.), 3.5% by mass of hexamethylenetetramine, glass fiber (CS3E479, manufactured by Nittobo Co., Ltd., average particle size: 11 μm, average major axis: 3mm, average aspect ratio: 270) 20.0% by mass, wollastonite (manufactured by NYCO Minerals, product name: NYAD325, average particle size: 10 μm) 30.0% by mass, fused silica (manufactured by ELKEM, product) Name: SIDISTAR, average particle size: 0.15 μm) 20.0% by mass, γ-aminopropyltriethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KBE-903) 1.0% by mass, magnesium oxide ( Kyowa Chemical Industry Co., Ltd., product name: Kyowamag 30) 0.4% by mass, other components such as lubricant 3.1% by mass Each dry mixing, which was melt-kneaded by a heating roll of 90 ° C., was then crushed those cooled into a sheet obtained granular thermosetting resin composition (P8).

(Comparative Example 2)
A metal resin composite 11 was produced in the same manner as in Example 1 except that the following thermosetting resin composition (P9) was used instead of the thermosetting resin composition (P1). This metal resin composite 11 was used as a test piece 11 and evaluated in the same manner as in Example 1.
22.0% by mass of novolac type phenolic resin (PR-51305, manufactured by Sumitomo Bakelite Co., Ltd.), 3.5% by mass of hexamethylenetetramine, glass fiber (CS3E479, manufactured by Nittobo Co., Ltd., average particle size: 11 μm, average major axis: 3mm, average aspect ratio: 270) 20.0% by mass, wollastonite (manufactured by NYCO Minerals, product name: NYAD325, average particle size: 10 μm) 30.0% by mass, fused silica (manufactured by ELKEM, product) Name: SIDISTAR, average particle size: 0.15 μm) 20.0% by mass, carboxylic acid-modified polyvinyl acetate (manufactured by Denki Kagaku Kogyo Co., Ltd., product name: Denka ASR CH-09) 0.2% by mass, γ -1.0 mass% of aminopropyltriethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KBE-903), magnesium oxide (Made by Kyowa Chemical Industry Co., Ltd., product name: Kyowamag 30) 0.4% by mass and 2.9% by mass of other components such as a lubricant were each dry-mixed, and this was melt-kneaded with a heating roll at 90 ° C. Then, the sheet-like cooled product was pulverized to obtain a granular thermosetting resin composition (P9).

(Comparative Example 3)
A metal resin composite 12 was produced in the same manner as in Example 1 except that the following thermosetting resin composition (P10) was used instead of the thermosetting resin composition (P1). This metal resin composite 12 was used as a test piece 12, and the same evaluation as in Example 1 was performed.
14.0% by mass of novolac-type phenolic resin (PR-51305, manufactured by Sumitomo Bakelite Co., Ltd.), 2.0% by mass of hexamethylenetetramine, glass fiber (CS3E479, manufactured by Nittobo Co., Ltd., average particle size: 11 μm, average major axis: 3mm, average aspect ratio: 270) 20.0% by mass, wollastonite (manufactured by NYCO Minerals, product name: NYAD325, average particle size: 10 μm) 30.0% by mass, fused silica (manufactured by ELKEM, product) Name: SIDISTAR, average particle size: 0.15 μm) 20.0% by mass, carboxylic acid-modified polyvinyl acetate (manufactured by Denki Kagaku Kogyo Co., Ltd., product name: Denka ASR CH-09) 10.5% by mass, γ -1.0% by mass of aminopropyltriethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KBE-903), magnesium oxide (Made by Kyowa Chemical Industry Co., Ltd., product name: Kyowamag 30) 0.3% by weight and other components such as lubricant 2.2% by weight are dry-mixed and melt-kneaded with a 90 ° C heating roll. Then, the cooled sheet was pulverized to obtain a granular thermosetting resin composition (P10).

(Evaluation of dimensional stability at high temperature of the case using metal resin composite)
Next, the dimensional stability evaluation at high temperature of the housing | casing using the metal resin composites 1-12 obtained by the Example and the comparative example was performed as follows.
First, the housing | casing was each produced using the metal resin composites 1-12 produced by the Example and the comparative example.
Next, each obtained casing was stored for 250 hours in an environment of a temperature of 85 ° C. and a humidity of 85%. Next, the housing after storage was visually observed for abnormalities.
○: No abnormality at the joint of the housing.
X: A gap is seen at the joint of the housing.

  The above evaluation results are shown in Tables 1 and 2.

The metal resin composites 1 to 9 obtained in Examples 1 to 9 had a warpage change rate in the range of −35% to 35%. Moreover, the metal resin composites 1-9 had sufficient bending strength.
All the cases using such metal resin composites 1 to 9 had no abnormalities in the joints and were excellent in dimensional stability at high temperatures.
On the other hand, the metal resin composites 10 to 12 obtained in Comparative Examples 1 to 3 had a warpage change rate outside the range of −35% to 35%. All the cases using the metal resin composites 10 to 12 had gaps at the joints and were inferior in dimensional stability at high temperatures.

  This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2013-263537 for which it applied on December 20, 2013, and takes in those the indications of all here.

Claims (10)

Of the metal resin composite comprising a resin member and a stainless steel metal member joined to the resin member, a thermosetting resin composition used for forming the resin member,
A thermosetting resin;
Filling material,
A shrinkage inhibitor,
Including
The thermosetting resin is a phenolic resin;
When the total solid content of the thermosetting resin composition is 100% by mass, the content of the filler is 55% by mass or more and 85% by mass or less,
The shrinkage inhibitor is one or more selected from the group consisting of acrylonitrile butadiene rubber, unmodified polyvinyl acetate, and carboxylic acid-modified polyvinyl acetate,
Using a molding machine, the thermosetting resin composition has a thickness of 1 mm and a maximum height (Rz) of 15 ± 1 μm under the conditions of an effective pressure of 20 MPa, a mold temperature of 175 ° C., and a curing time of 3 minutes. The sheet-like metal resin composite having a length of 80 mm, a width of 10 mm, and a thickness of 4 mm is produced by injection molding into a mold in which a stainless steel sheet is placed. Thereafter, the sheet-like metal resin composite is 150 ° C. When stored for 250 hours,
Using a temperature-variable laser three-dimensional measuring machine, the distance from the laser head is the longest distance when the laser is perpendicularly applied to the surface of the sheet-like metal resin composite on the stainless steel sheet side. The difference between the far point and the closest point from the laser head is defined as the amount of warpage,
The amount of warpage before storage is X1,
When the amount of warpage after storage is X2,
In the sheet-like metal resin composite after the storage, the resin member made of the thermosetting resin composition and the stainless steel sheet maintain a bonded state,
The thermosetting resin composition whose curvature change rate calculated by (X2-X1) / X1 * 100 is -35% or more and 35% or less. In the thermosetting resin composition according to claim 1,
The linear expansion coefficient α _R in the range from 25 ° C. to the glass transition temperature of the resin member in the sheet-like metal resin composite, and in the range from 25 ° C. of the stainless steel sheet to the glass transition temperature of the resin member. absolute value is not more than 15 ppm / ° C., the thermosetting resin composition of the difference between the linear expansion coefficient _{α M (α R -α M)} . In the thermosetting resin composition according to claim 1 or 2,
The linear expansion coefficient α _{R1 in} the flow direction of the resin member and the linear expansion in the direction perpendicular to the linear expansion coefficient α _R in the range from 25 ° C. to the glass transition temperature of the resin member in the sheet-like metal resin composite. absolute value of the difference between the coefficient α _R2 (α _R1 -α _R2) is less than 10 ppm / ° C., the thermosetting resin composition. In the thermosetting resin composition according to any one of claims 1 to 3 ,
The thermosetting resin composition whose content of the said shrinkage | contraction inhibitor is 0.5 mass% or more and 10 mass% or less when the total solid of the said thermosetting resin composition is 100 mass%. In the thermosetting resin composition according to any one of claims 1 to 4 ,
The filler is wollastonite, kaolin clay, talc, mica, glass beads, titanium oxide, alumina, silica, calcium carbonate, aluminum hydroxide, magnesium hydroxide, barium sulfate, calcium sulfate, calcium sulfite, zinc borate, Thermosetting resin composition that is one or more selected from the group consisting of barium metaborate, aluminum borate, calcium borate, sodium borate, aluminum nitride, boron nitride, silicon nitride, carbon fiber, and glass fiber object. In the thermosetting resin composition according to any one of claims 1 to 5 ,
A thermosetting resin composition, wherein the phenol resin is one or more selected from the group consisting of a novolac-type phenol resin, a resol-type phenol resin, and an arylalkylene-type phenol resin. A metal resin composite comprising a resin member made of the thermosetting resin composition according to any one of claims 1 to 6 and a stainless steel metal member joined to the resin member. In the metal resin composite according to claim 7 ,
The said stainless steel metal member is a metal resin composite which has a roughening layer which consists of a fine unevenness | corrugation in the joining surface joined to the said resin member at least. In the metal resin composite according to claim 8 ,
The cross section of the concave portion constituting the concave and convex portions is a metal-resin composite having a shape having a cross sectional width larger than the cross sectional width of the opening portion in at least a part between the opening portion and the bottom portion of the concave portion. In the metal resin composite according to any one of claims 7 to 9 ,
A metal resin composite, wherein the roughened layer has a thickness in the range of 3 μm to 40 μm.

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