JP4815822B2 - Method for producing composite thermoplastic resin plated molded article - Google Patents

Description

The present invention relates to a method for producing a composite thermoplastic resin plated molded article obtained by performing plating on the surface of an injection molded article of a molding material in which a thermoplastic resin and an inorganic filler are blended. The present invention relates to a method for producing a composite thermoplastic resin plated molded article having an appearance and excellent plating film adhesion and thermal cycle resistance.
The composite thermoplastic resin plating molded article of the present invention exhibits high appearance and high quality, and is suitable for electricity, electronic parts, mobile phones, home appliances, and other automobile interior and exterior products.

  In recent years, housings such as personal computers, televisions, and audio equipment in the OA field, mobile phone housings, and radiator grills in the vehicle field have become thinner as a result of design and weight reduction. Good moldability and high rigidity have been demanded. In addition, in order to enhance the sense of quality, it is often required to give a metallic appearance by performing a plating treatment on the resin moldings constituting them, and for this reason, a resin molded product suitable for the plating treatment. Is required. That is, there is a demand for a resin molded product that exhibits a practically sufficient plating appearance, plating film adhesion strength, and thermal cycle resistance by ordinary plating treatment.

  If the resin adaptability of the resin molded product is poor and the plating is defective, it takes a lot of energy to remove the plating film to recover the resin from the defective product. Often becomes. For this reason, in order to reduce plating defects, reduce industrial waste, and eliminate energy waste, it is desired to develop a resin molded product excellent in plating adaptability.

  Conventionally, as a method of imparting rigidity to a resin molded product, there is a method of adding an inorganic filler such as glass fiber to a resin composition as a molding raw material to reinforce, but in this method, the surface of the obtained molded product is added. Since the fibrous filler is exposed, there is a problem that the surface smoothness is poor. Moreover, even if a conventional resin molded product is subjected to a normal plating treatment, a plated molded product exhibiting a practically satisfactory plating appearance, adhesion strength of the plating film and thermal cycle resistance has not been obtained.

  As a method for avoiding the exposure of the fibrous filler on the surface of the molded product, Patent Document 1 proposes a method of controlling the mold temperature during injection molding in accordance with the softening point of the resin. Further, Patent Document 2 proposes a mold for synthetic resin molding capable of alternately heating and cooling the mold, and Patent Document 2 discloses that the mold temperature is alternately heated and cooled by such a mold. It is described that the exposure of glass fibers or the like can be prevented by molding the glass fiber.

However, neither of the above-mentioned Patent Documents 1 and 2 has studied the plating treatment of the obtained resin molded product. Conventionally, it has been practically applied by rigidity and plating adaptability, that is, normal plating treatment. The present condition is that the thermoplastic resin molded product which shows the said sufficient plating external appearance, plating film adhesion strength, and thermal cycle resistance is not provided.
JP 2004-130528 A JP 2001-18229 A

  The present invention has been made in view of the above-described conventional circumstances, and the object thereof is a composite thermoplastic resin having an unprecedented appearance and excellent plating film adhesion and thermal cycle resistance. It is to provide a plated molded product.

The method for producing a composite thermoplastic resin plated molded article according to the present invention (Claim 1) is a composite thermoplastic resin obtained by subjecting the surface of an injection molded article of a molding material containing a thermoplastic resin and an inorganic filler to plating. In the method for producing a plated molded article, the molding material is 100 parts by mass of a styrene resin, or one or more selected from the group consisting of a polycarbonate resin, a nylon resin, and a polyester resin is added to the styrene resin. 1 selected from the group consisting of glass fiber, carbon fiber, and talc with respect to 100 parts by mass of the alloy resin in which the ratio of the styrene resin contained in the alloy resin is 30 to 70% by mass. A composite thermoplastic resin composition comprising 5 to 30 parts by mass of seeds or two or more inorganic fillers, and the injection-molded product is a combination of steam and water The mold material is injected in a state where the surface temperature of the injection mold in which the cavity surface of the mold is alternately heated and cooled by the above is heated above the heat deformation temperature of the thermoplastic resin using steam as a heating medium. After the injection is completed, the molded product is obtained by a heat cycle method in which the mold surface is cooled by using water as a cooling medium and the molded product is taken out.

  In the present invention, the plating treatment is not limited to the formation of a plating film by chemical plating and / or electroplating, but refers to a plating treatment in a broad sense including the formation of a metal thin film by vacuum deposition or the like.

The method for producing a composite thermoplastic resin plated molded article according to claim 2 is the method according to claim 1, wherein the molding material is blended in an amount of 5 to 30 parts by mass of the inorganic filler with respect to 100 parts by mass of the alloy resin. It is a composite thermoplastic resin composition.

The method for producing a composite thermoplastic resin plating molded article according to claim 3 is the composite heat according to claim 2, wherein the molding material is blended with 5 to 10 parts by mass of glass fiber with respect to 100 parts by mass of the alloy resin. It is a plastic resin composition.

  According to the present invention, it is possible to improve the appearance of a composite thermoplastic resin plated molded product that could not be achieved conventionally, and to improve the adhesion strength and thermal cycle resistance of the plating film. In other words, an injection molded product obtained by a heat cycle molding method in which the cavity surface temperature is repeatedly raised and lowered using an injection mold in which the cavity surface of the mold is alternately heated and cooled is itself an excellent surface appearance. By subjecting this injection-molded product to plating treatment, it is possible to obtain an excellent plating appearance, adhesion strength of the plating film and thermal cycle resistance.

  Therefore, according to the present invention, it is possible to provide a plated molded product having a thin, highly rigid and high-quality plating appearance and plating performance, which has been impossible until now, and pursuing a high-class feeling by improving the design, Industrial waste can be reduced by reducing defects, and energy can be saved, and its industrial value is extremely high.

Embodiments of a method for producing a composite thermoplastic resin plating molded article of the present invention will be described in detail below.

[Composite thermoplastic resin composition]
First, the composite thermoplastic resin composition which is a molding material used in the present invention will be described.
The composite thermoplastic resin plated molded article according to the present invention is 100 parts by mass of styrene resin, or one or more selected from the group consisting of polycarbonate resin, nylon resin, and polyester resin is added to styrene resin. 5 to 30 parts by mass of one or more inorganic fillers selected from the group consisting of glass fiber, carbon fiber, and talc are added to 100 parts by mass of the resulting alloy resin.

<Styrene resin>
Examples of the styrenic resin used in the present invention include general (GP) polystyrene, impact resistant (HI) polystyrene, AS resin which is a styrene-acrylonitrile copolymer, ABS resin composed of styrene-butadiene-acrylonitrile copolymer, and the ABS. A heat-resistant ABS resin in which a part or most of the styrene of the resin is replaced with α-methylstyrene or maleimide, and the butadiene of the ABS resin is replaced with ethylene-propylene rubber or polybutyl acrylate (heat resistant) AES resin, ( Heat resistant) ABS resin such as AAS resin, and (heat resistant) ABS resin in which butadiene of the ABS resin is replaced with silicon rubber or silicon-acrylic composite rubber. These styrene resins may be used alone or in combination of two or more.

  Among these styrene resins, ABS resins and ABS resins are particularly preferable because they have excellent plating adhesion and are excellent in plating appearance.

  Although it does not specifically limit as a manufacturing method of ABS resin or ABS type resin, An emulsion polymerization method, suspension polymerization method, solution polymerization method, etc. are applicable. In particular, the rubber particles can be produced by emulsion polymerization until a predetermined particle diameter is reached, but the method of using small particles for enlargement by mechanical aggregation, chemical aggregation, etc., and subsequent graft polymerization, It is particularly preferably used from the viewpoint of impact resistance of the obtained molded product. In the graft polymerization, a vinyl monomer is graft-copolymerized in the presence of rubber, and it is produced by acid or salting out and drying.

  If necessary, a hard copolymer obtained by copolymerizing vinyl monomers can be blended during the production of the composite thermoplastic resin composition, and by using these, excellent plating adhesion can be obtained. And plating appearance can be obtained.

  When the styrene resin is used, it is preferable from the viewpoints of moldability in the heat cycle molding method and decorating properties such as plating after molding.

<Alloy resin>
The alloy resin used in the present invention is obtained by adding one or more of a polycarbonate resin, a nylon resin, and a polyester resin to the above-described styrenic resin.

The ratio of the styrene resin contained in the alloy resin is area by der of 3 0 to 70 wt%. If the ratio of the styrene resin in the alloy resin is less than this range, it is difficult to make use of the secondary processability characteristics of the styrene resin such as plating and paintability, and if more, it is due to alloying with other resins. The effect cannot be obtained sufficiently.

(Polycarbonate resin)
The polycarbonate resin used in the present invention is obtained from dihydroxydiarylalkane, and may be arbitrarily branched. This polycarbonate resin is produced by a known method, and is generally produced by reacting a dihydroxy or polyhydroxy compound with phosgene or a diester of carbonic acid. Suitable dihydroxydiarylalkanes are those having an alkyl group, a chlorine atom or a bromine atom in the ortho position relative to the hydroxy group. Preferable specific examples of the dihydroxydiarylalkane include 4,4-dihydroxy2,2-diphenylpropane (= bisphenol A), tetramethylbisphenol A, bis- (4-hydroxyphenyl) -p-diisopropylbenzene, and the like. The branched polycarbonate is produced, for example, by substituting a part of the dihydroxy compound, for example, 0.2 to 2 mol% with polyhydroxy. Specific examples of the polyhydroxy compound include phloroglucinol, 4,6-dimethyl-2,4,6-tri (4-hydroxyphenyl) -heptene, 4,6-dimethyl-2,4,6-tri- ( 4-hydroxyphenyl) -heptane, 1,3,5-tri- (4-hydroxyphenyl) -benzene and the like.

  These polycarbonate resins may be used alone or in combination of two or more.

  By synthesizing a polycarbonate resin into an styrene-based resin with an optimal composition, a synergistic effect of improving impact strength, heat resistance, plating, and paintability is achieved.

(Nylon resin)
Examples of the nylon resin used in the present invention include nylon 6, nylon 46, nylon 66, nylon 69, nylon 610, nylon 612, nylon 116, nylon 4, nylon 7, nylon 8, nylon 11, nylon 12, nylon 6I, Nylon 6/66, Nylon 6T / 6I, Nylon 6 / 6T, Nylon 66 / 6T, Polytrimethylhexamethylene terephthalamide, Polybis (4-aminocyclohexyl) methane dodecamide, Polybis (3-methyl-4-aminocyclohexyl) methane Examples include dodecamide, polymetaxylylene adipamide, nylon 11T, polyundecamethylenehexahydroterephthalamide, polyamide elastomer and the like (where I represents an isophthalic acid component and T represents a terephthalic acid component).

  These nylon resins may be used alone or in combination of two or more.

  Of these, nylon 6, nylon 46, nylon 66, nylon 12, nylon 6T / 6I, nylon 6 / 6T, and nylon 66 / 6T are particularly preferably used in the present invention.

  By synthesizing a styrene resin with a nylon resin with an appropriate composition, a synergistic effect of improving chemical resistance, heat resistance, plating, and paintability is achieved.

(Polyester resin)
The polyester resin used in the present invention contains at least 50% by weight of an aromatic dicarboxylic acid having 8 to 22 carbon atoms and an alkylene glycol or cycloalkylene glycol having 2 to 22 carbon atoms, such as adipic acid. And sebacic acid may be included as structural units, and polyalkylene glycols such as polyethylene glycol and polytetramethylene glycol may be included as structural units. Particularly preferred polyester resins include polyethylene terephthalate and polytetramethylene terephthalate.

  These polyester resins may be used individually by 1 type, and 2 or more types may be mixed and used for them.

  By synthesizing a styrene resin with a polyester resin with an appropriate composition, a synergistic effect of improving chemical resistance, impact strength, plating, and paintability is achieved.

<Inorganic filler>
As the inorganic filler used in the present invention, the impact resistance of glass fibers from the standpoint of improvement of carbon-containing fibers, Tal click and the like, using these alone or in combination of two or more be able to.

  Among these inorganic fillers, those having a fiber diameter of 5 to 60 μm and a fiber length of 30 μm or more are preferable as the fiber size such as glass fiber and carbon fiber. Moreover, the thing with an average particle diameter of 0.05-2 micrometers is preferable for a granular thing.

Inorganic filler, relative to front 100 parts by weight styrene resin or alloy resin predicates are formulated in a range of 5 to 30 parts by weight. When the blending amount of the inorganic filler exceeds 50 parts by mass, the impact strength of the obtained plated product is lowered, and the appearance is also impaired. If the amount is less than 1 part by mass, sufficient rigidity cannot be obtained, and the thermal cycle resistance of the obtained plated product is inferior.

[Other ingredients]
In this invention, you may use a flame retardant as needed for the composite thermoplastic resin composition which is a molding material.
Examples of the flame retardant used in the present invention include halogen-containing compounds, phosphorus-containing compounds, nitrogen-containing compounds, metal hydroxides and the like.

  The halogen-containing compound is not particularly limited, but brominated flame retardants can be preferably used. For example, tetrabromobisphenol A and its derivatives, tetrabromobisphenol S, tetrabromophthalic anhydride, hexabromobenzene, brominated diphenyl ether, bromine 1 such as brominated polycarbonate oligomer and its end-modified product, brominated epoxy resin (bisphenol A type, novolak type) and its end-modified product, brominated phenoxy resin, trisbromophenyl phosphate, brominated polystyrene, brominated phenylene ether oligomer, etc. Species or two or more species are preferably used.

  Examples of phosphorus-containing compounds include organic phosphorus-containing compounds, red phosphorus, phosphazene compounds, and ammonium polyphosphate. Examples of the organic phosphoric acid-containing compound include phosphates typified by triphenyl phosphate, phosphites typified by triphenyl phosphite, and the like. The phosphates include triphenyl phosphate, triphenyl thiophosphate, trixylenyl phosphate, trixylenyl thiophosphate, hydroquinone bis (diphenyl phosphate), resorcinol bis (diphenyl phosphate), hydroquinone bis (dixylenyl phosphate), resorcinol bis (Dixylenyl phosphate) and the like are preferable. In particular, in order to prevent mold contamination, oligomeric phosphates are preferable to monomolecular phosphates.

  In order to further improve the flame retardancy, an antimony compound may be added to the composite thermoplastic resin composition according to the present invention as a flame retardant aid. A well-known thing can be used as an antimony compound, For example, 1 type, or 2 or more types, such as antimonate, such as antimony trioxide, antimony pentoxide, and sodium antimonate, are mentioned. As these antimony compounds, those having a surface treated are commercially available, and those having a surface treated may be used.

  In order to further improve the flame retardancy of the resin composition, at least one selected from polytetrafluoroethylene, chlorinated polyethylene, and silicone oil may be blended with the composite thermoplastic resin composition according to the present invention. .

  The composite thermoplastic resin composition according to the present invention may further contain a benzotriazole compound and / or a hindered amine compound in order to further improve the weather resistance.

[Method for producing composite thermoplastic resin composition]
Composite thermoplastic resin composition according to the present invention, prior Symbol styrene resin or alloy resin, inorganic filler, and a flame retardant as required, if necessary, added within the range that does not impair the object of the present invention Mixed with antioxidants, lubricants, processing aids, colorants, UV absorbers, plasticizers, antistatic agents, flame retardants other than those mentioned above, additives such as pigments, for example, extruders, Banbury mixers, kneading It can be easily manufactured by kneading with a roll or the like and pelletizing. Although the composite thermoplastic resin composition according to the present invention can be easily melt-kneaded by such a method, it is preferable to use an extruder as a method for well dispersing and kneading the inorganic filler.

[Heat cycle molding]
Next, a method for obtaining an injection-molded product by injection molding by a heat cycle molding method using the composite thermoplastic resin composition as described above as a molding material will be described.

In the present invention, a composite thermoplastic resin composition is applied by applying a heat cycle molding method in which the cavity surface temperature of the mold is repeatedly raised and lowered using an injection mold in which the cavity surface of the mold is alternately heated and cooled. Perform injection molding. The heat cycle molding method, for example as described in Patent Document 2 described above, that apply a heat cycle injection molding method for heating and cooling the cavity surface in a short time by a combination of steam and water.

Specifically, the molding by the heat cycle molding method is, for example,
(1) The surface temperature of the mold cavity is heated to a temperature higher than the heat deformation temperature of the resin component, and the molding material is injected and filled.
(2) After the pressure holding step, the mold is cooled and cooled to a temperature that does not deform even when the molded product is taken out, and the molded product is taken out.
It can be done with the procedure.

  In this way, a skin layer free of inorganic filler is formed on the surface of the molded product by filling the molding material with the surface temperature of the cavity of the mold being heated above the heat deformation temperature of the resin component. In the presence of the skin layer, good appearance and plating adhesion can be obtained by plating. In normal injection molding that does not heat the mold, or molding methods that heat only below the heat distortion temperature of the resin component even when heated, a skin layer that does not contain an inorganic filler is not formed, and plating is performed in a later step. However, good appearance and plating adhesion strength cannot be obtained.

[Plating treatment]
In the present invention, composite thermoplastics exhibiting high-grade plating appearance, adhesion strength, and thermal cycle resistance that cannot be achieved by ordinary molding methods by plating an injection molded product obtained by the heat cycle molding method as described above. A resin plating molded product can be obtained.
This plating treatment can be performed according to a conventional method as shown in the examples described later.

  Although there is no restriction | limiting in particular about the thickness of the plating film formed by plating process, Usually, it is about 5-100 micrometers. If this film thickness is too thin, it is inferior in corrosion resistance and thermal cycle resistance, and if it is too thick, the plating process becomes complicated and has a long time, which is disadvantageous in the production process.

  Further, instead of chemical plating and / or electroplating, a metal film may be formed by a technique such as vacuum deposition, and in this case, the same effect as the plating treatment can be obtained.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to the following examples unless it exceeds the gist.

The molding raw materials used in the following examples and comparative examples are as follows.
Styrene resin: ABS resin (plating grade) “3001” manufactured by UMG ABS Co., Ltd.
M "
Polycarbonate resin: Polycarbonate made by Mitsubishi Engineering Plastics
Resin "S-3000"
Nylon resin: Nylon 6 resin “1013B” manufactured by Ube Industries, Ltd.
Polyester resin: Polyethylene terephthalate resin “KS750R” manufactured by Kuraray Co., Ltd.
C "
Glass fiber: Glass fiber “ECS03T-34” manufactured by Nippon Electric Glass Co., Ltd.
(Fiber diameter 13μm, average fiber length = 3mm)
Carbon fiber: Carbon fiber "Bes Fight" manufactured by Toho Rayon Co., Ltd.
(Fiber diameter = 7 μm, average fiber length = 6 mm)
Talc: Talc “MICRO ACE Microace P-3” manufactured by Nippon Talc Co., Ltd.
(Average particle size (measurement method; centrifugal sedimentation method) = 1.8 μm)

Examples 1 7 and Comparative Example 1-3
[Production of composite thermoplastic resin composition]
The composite thermoplastic resin composition pellets were obtained by melt-kneading various resins and inorganic fillers with the extruder shown in Table 1 using an extruder.

[injection molding]
Using the obtained composite thermoplastic resin composition pellets, heat cycle molding was performed by the following method (1) to obtain a box-shaped molded article 1 as shown in FIG.
However, in Comparative Example 1, injection molding was performed by the following general method (2).
(1) Heat cycle molding Using pellets of composite thermoplastic resin composition "SG150-SYCAPM IV molding machine" manufactured by Sumitomo Heavy Industries, Ltd. with "High Speed Heat Cycle Molding Unit" manufactured by Ono Sangyo Co., Ltd., The resin temperature is appropriately changed as shown in Table 1 according to the material used, and injection is performed at the optimum set temperature. The mold temperature when filling the mold with resin is 110 ° C, and the mold temperature when cooling is 40 ° C. The heat cycle injection molding was performed. For adjusting the mold temperature, steam was used as a heating medium, and water was used as a cooling medium.
(2) General molding The pellets of the composite thermoplastic resin composition are represented by a “IS55FP-1.5A molding machine” manufactured by TOSHIBA MACHINE CO., LTD. Injection molding was performed at the optimum set temperature shown in FIG.

[Plating treatment]
About the obtained molded article, the normal plating process was performed in the procedure of following (1)-(9), and the plated molded article was obtained.
(1) Degreasing process The CRP cleaner was treated with 40 g / liter at 50 ° C. for 5 minutes and washed with pure water three times.
(2) Etching Step A chromic anhydride of 400 g / liter, trivalent chromium of 30 g / liter, and sulfuric acid of 380 g / liter were immersed in a mixed solution at 68 ° C. for 15 minutes, and then washed with pure water.
(3) Neutralization process It was immersed in a mixed solution of 35% hydrochloric acid 50 ml / liter and CRP reducer 10 ml / liter at 25 ° C. for 2 minutes, and then washed with pure water.
(4) Pre-dip process It was immersed in 200% / liter of 35% hydrochloric acid for 1 minute at 25 ° C.
(5) Catalyzing step It was immersed in a mixed solution of 35% hydrochloric acid 300 ml / liter and CRP catalyst 60 ml / liter at 45 ° C. for 7 minutes, and then washed with pure water.
(6) Conducting step The substrate was immersed in a mixed solution of CRP accelerator A 200 ml / liter and CRP accelerator B 200 ml / liter at 50 ° C. for 7 minutes, and then washed with pure water.
(7) Electro-copper plating process Mixing the sample after the process of (6) with copper sulfate 200 g / liter, sulfuric acid 50 g / liter, chloride ion 70 ml / liter, CRP copper MU 5 ml / liter, CRP copper A 0.5 ml / liter A copper plating film having a thickness of 30 μm was formed at 25 ° C. and a current density of 6 A / dm ² . In addition, about the sample for peeling tests, it processed until it became a film thickness of 60 micrometers.
(8) Electro-nickel plating step The sample after completion of step (7) is mixed with 280 g / liter of nickel sulfate, 50 g / liter of nickel chloride, 50 g / liter of boric acid, 5 ml / liter of CRP copper MU, 0.5 ml / liter of CRP copper A A nickel plating film having a thickness of 10 μm was formed at 25 ° C. and a current density of 6 A / dm ² .
(9) Electrochromic plating step The sample after completion of the step (8) is immersed in a mixed solution of 200 g / liter of chromic anhydride and 3 g / liter of sulfuric acid, and a film thickness of 0.25 μm at 25 ° C. and a current density of 30 A / dm ^2. A chromium plating film was formed.

[Evaluation]
About the obtained plating molded article, various characteristics were tested on the following conditions and methods, and the result is shown in Table 1.

<appearance>
The plated molded product that had been subjected to the electrochrome plating step was visually observed and judged based on the following criteria.
○: The glossy portion has a high degree of surface gloss, and the wrinkled portion (the wrinkled surface 1B portion) is in a uniform matte state.
(Triangle | delta): There are some cloudiness in a glossy part, or there is some unevenness in a wrinkle part.
X: There is no surface gloss, unevenness of the squeezing and unevenness of the welded portion are generated. In addition, the inorganic filler protrudes.

<Peeling strength>
About the molded product finished up to the copper electroplating step, a test piece was cut out at 4 cm × 10 cm as shown in 1A part of FIG. 1, and after the plating film was cut at a width of 1 cm, the test piece was cut at an angle of 90 °. The plating film was pulled to measure the peel strength.
As a guideline for use in a product, if this peel strength shows a value of 1.0 kg / cm or more, it is judged that there is no practical problem.

<Thermal cycle resistance>
For the plated molded product that has been processed up to the electrochrome plating step, 10 cycles of -40 ° C × 2 hours → 23 ° C × 30 minutes → 90 ° C × 2 hours → 23 ° C × 30 minutes are performed as one cycle. The presence or absence of blisters and cracks was observed and evaluated according to the following criteria.
○: No blistering or cracking occurred.
Δ: Either blistering or cracking slightly occurred.
X: Swelling and cracks occur severely.

[Discussion]
From Table 1, the following is clear.

<Description of Examples 1 to 7, Comparative Examples 2 and 3 >
Of plated molded article of Examples 1 7 and Comparative Examples 2 and 3 according to the present invention performing the heat cycle molding, plating moldings of Examples 1 to 7 using a composite thermoplastic resin composition according to the present invention Is excellent in surface appearance, plating peeling strength and thermal cycle resistance. Therefore, according to the present invention, despite the fact that inorganic fillers such as glass fibers for strengthening rigidity are blended, it is possible to obtain an extremely high plating appearance and performance that could not be obtained conventionally. I understand.

<Description of Comparative Example 1>
In Comparative Example 1 in which the heat cycle molding is not performed, it is understood that the plating appearance is remarkably deteriorated and the plating ability is low.

In Comparative Example 2, since was 1 part by weight additive outside the scope of the present invention the glass fibers, although the plating appearance is good, resistance to thermal cycling resistance slightly decreases. In Comparative Example 3, because of the added 40 parts by weight outside the range of the present invention the glass fiber, plating peeling strength coating appearance is deteriorated even a decline.

  From these results, according to the present invention, an improvement in plating appearance and plating performance that could not be achieved in the past has been achieved. As a result, a thin plated product with high rigidity and a good plated product can be obtained. It can be seen that it can be obtained.

  The composite thermoplastic resin plating molded product of the present invention includes door mirrors, radiator grills, garnishes, rear garnishes, interior / exterior pillars, etc. as vehicle fields, household appliances fields as screen frames for liquid crystal televisions, cathode ray tube televisions, plasma televisions, etc. It is suitable for personal computer, printer housing, portable information terminal housing, etc. in the field of office equipment such as television tilt stands, portable and landline phone housings, and game machine housings.

Is a schematic perspective view showing an injection molded article molded in Examples 1 7 and Comparative Examples 1-3.

  1 Box-shaped molded product

Claims (3)

In the method for producing a composite thermoplastic resin plating molded article obtained by plating the surface of an injection molded article of a molding material in which a thermoplastic resin and an inorganic filler are blended,
The molding material is 100 parts by mass of a styrene resin, or an alloy resin obtained by adding one or more selected from the group consisting of a polycarbonate resin, a nylon resin, and a polyester resin to a styrene resin, One or more inorganic fillers selected from the group consisting of glass fiber, carbon fiber, and talc with respect to 100 parts by mass of the alloy resin in which the ratio of the styrene resin contained in the alloy resin is 30 to 70% by mass. It is a composite thermoplastic resin composition comprising 5 to 30 parts by mass of a material,
The injection-molded product has a surface temperature of the injection mold in which the cavity surface of the mold is alternately heated and cooled by a combination of steam and water, and is higher than the heat deformation temperature of the thermoplastic resin using steam as a heating medium. The molded material is obtained by a heat cycle method in which the molding material is injected in a heated state, and after the injection is completed, water is used as a cooling medium to cool the mold surface and take out the molded product. A method for producing a composite thermoplastic resin plating molded product characterized by the following. 2. The composite thermoplastic resin according to claim 1, wherein the molding material is a composite thermoplastic resin composition comprising 5 to 30 parts by mass of the inorganic filler with respect to 100 parts by mass of the alloy resin. Manufacturing method of resin plating molded product. 3. The composite thermoplastic resin plating according to claim 2, wherein the molding material is a composite thermoplastic resin composition in which 5 to 10 parts by mass of glass fiber is blended with 100 parts by mass of the alloy resin. Manufacturing method of molded products.

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