JPH0274340A - Laminated molded product and its manufacturing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a laminate molded product in which a skin layer made of another synthetic resin is laminated on an aggregate molded product made of a synthetic resin, and a method for manufacturing the same. [Prior art] Conventionally, the surface of a three-dimensional molded product has been protected with a synthetic resin skin layer, or a synthetic resin skin layer has been applied to a synthetic resin aggregate molded product as a decorated or printed molded product. BACKGROUND ART A laminate molded product having laminated layers is known. This laminated molded product is obtained by vacuum forming a synthetic resin sheet onto the inner wall of the cavity of an injection mold to preform it, and then injecting and filling the cavity with a synthetic resin in a fluidized plastic state. It is widely used mainly as interior and exterior parts of automobiles, building materials, etc. Such a molded product has the advantage that if a skin layer with letters, patterns, etc. added thereto is used, the three-dimensional molded product can be easily decorated at the same time as molding. [Problem to be solved by the invention] However, conventionally, synthetic resin sheets used as the skin layer 1-.
For example, polyvinyl chloride is used as the film, but conventional skin layer materials have poor suction properties during vacuum forming, and the three-dimensional shape of the molded product is complex (this makes molding difficult, causing corners to Problems such as cracks occurring or wrinkles occurring on -gB occurred.Furthermore, the texture created by transferring the texture pattern on the inner wall surface of the mold cavity was not necessarily good. The skin layer of vinyl chloride, etc. lacks flexibility, has poor heat resistance and cold resistance, and the plasticizer bleeds out, so it is inferior in terms of texture as an automobile interior part, and has good resistance to slight adhesion. In addition, it is important for laminated molded products to have good adhesive strength between each layer.The present invention is intended to solve these problems.
Excellent surface flexibility, heat resistance, cold resistance, and Z scratch resistance.
The present invention provides a laminate molded article that is easy to manufacture, and a method for manufacturing the same. [Means to Solve the Problems] The laminate molded product of the present invention has at least two skin layers of thermoplastic elastomers made of a blend of a polyolefin resin and a partially crosslinked product of ethylene/α-olefin polymer rubber. This is a laminate molded product that is laminated on the surface of an aggregate molded product made of a synthetic resin layer. In addition, as a manufacturing method, multiple male molds with different sizes of cavities when glued together are prepared for one female mold, and polyolefin resin and ethylene/α-olefin resin are used. After preheating a sheet or film of a thermoplastic elastomer made of a blend with a partially crosslinked polymer rubber, the sheet or film is brought into close contact with the inner wall surface of the female mold by suction, and then the small inner cavities of the plurality of male molds are heated. The mold is clamped using the first male mold, and the first synthetic resin in a fluidized plastic state is injected and filled into the cavity, and then,
Instead of the first male mold used earlier, the mold is clamped with a second male mold with a cavity larger than this first male mold, and the molded article is formed from the first synthetic resin in the previous step. In this method, a second synthetic resin in a flow plasticized state is injected and filled into a cavity formed between the mold and a second male mold, and the male mold is replaced at least once. [Function] In the present invention, the thermoplastic elastomer comprising a blend of a polyolefin resin and a partially crosslinked ethylene/α-olefin polymer rubber forming the skin layer S is
Excellent flexibility, resistance (H resistance, heat resistance, cold resistance,
It has little temperature dependence in flexibility, and does not have the sticky feeling on the surface that occurs with plasticizer-containing soft polyvinyl chloride, making it ideal as an outer surface layer material for molded objects. Furthermore, since the molding method of the present invention uses the sheet or film made of the thermoplastic elastomer, it has good suction adhesion performance to the inner wall surface of the mold, and can handle complex three-dimensional shapes without cracking or wrinkles. In addition to being able to be molded without causing wrinkles, it also cuts deeply into the grooves of the grain pattern, making it easy to create grains. In the present invention, polyolefin resin and ethylene α
- Thermoplastic elastomers made of blends of olefinic polymer rubber and partially crosslinked products include the following. (I) Various polyolefin resins represented by homopolymers of ethylene or propylene or copolymers with small amounts of other polymerizable monomers, and ethylene with carbon atoms of 3 to 3
A partially crosslinked blend of ethylene/α-olefin copolymer rubber, which is a binary copolymer rubber with 14 α-olefins or a ternary copolymer rubber obtained by further copolymerizing various polyene compounds with this rubber. (for example, Japanese Patent Publication No. 53-21021 and Japanese Patent Application Publication No. 55-7
(See Publication No. 1738). (II) A thermoplastic composition obtained by dynamically heat-treating a blend of a polyolefin resin and an ethylene/α-olefin copolymer rubber (for example,
No. 210, JP-A-53-149240, and JP-A-53-149241). (III) A thermoplastic composition obtained by dynamically heat-treating a blend of a polyolefin resin and an ethylene/α-olefin copolymer rubber, and further blending a polyolefin resin ( For example,
Publication No. 3-145857, and Japanese Patent Application Laid-Open No. 16554-1983
(see publication). (IV) A peroxide crosslinked polyolefin resin represented by a homopolymer of ethylene or a copolymer with a small amount of other polymerizable monomer, a homopolymer of propylene or a copolymer with a small amount of other polymerizable monomer. A thermoplastic composition obtained by dynamically heat-treating a blend of a peroxide non-crosslinked polyolefin resin represented by a copolymer of -71739). In these various thermoplastic elastomers, the weight ratio of the polyolefin resin and the partially crosslinked ethylene/α-olefin polymer rubber is 90/10 to 10/90, preferably 80/20 to 20/80. It is used as a blend. As the polyolefin resin, polyethylene, especially low density polyethylene and polypropylene, are selected from the viewpoint of ease of molding during sheet molding and scratch resistance of the sheet.
It is preferable to mix and use at a weight ratio of /90 to 70/30. In addition, the ethylene/α-olefin polymer rubber to be partially crosslinked contains ethylene and α-olefin in a molar ratio of 50,150 to 90/10, preferably 70/30 to 85/15, mainly for reasons of strength. In terms of ratio, it is desirable to use a Mooney viscosity ML1+4 (121° C.) of about 20 or more, preferably about 40 to 80. Partial crosslinking of these ethylene◆α-olefin polymer rubbers is generally performed using thermoplastic elastomer 100.
This is carried out by dynamic heat treatment using about 0.1 to 2 parts by weight of organic heloxide. If necessary, peroxide non-crosslinked hydrocarbon rubber-like substances such as polyisobutylene, butyl rubber, etc. and/or mineral oil-based softeners can be mixed into these thermoplastic compositions. Furthermore, by adding maleic anhydride to these thermoplastic elastomers and subjecting them to graft polymerization, thermoplastic elastomers with excellent adhesion to nylon, polyethylene terephthalate, polyurethane, etc. can be obtained. Next, as the synthetic resin used to mold the aggregate molded body, either a thermoplastic resin or the above-mentioned thermoplastic elastomer can be used. Examples of thermoplastic resins include low-density polyethylene, high-density polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene, ethylene, propylene-1-butene, and 4-methyl, regardless of whether they are crystalline or non-crystalline. - Polyolefins such as random or block copolymers of α-oxyfins such as pentene, ethylene/acrylic acid copolymers, ethylene/vinyl acetate copolymers, ethylene/vinyl alcohol copolymers, ethylene/vinyl chloride copolymers, etc. Polymers, such as ethylene/vinyl compound copolymers, polystyrene, acrylonitrile/styrene copolymers, ABS
, styrenic resins such as methyl methacrylate/styrene copolymer, α-methylstyrene/styrene copolymer, polyvinyl chloride, polyvinylidene chloride, vinyl chloride/vinylidene chloride copolymer, acrylic acid ester, polyacrylic acid Methyl, polyvinyl compounds such as polymethyl methacrylate, nylon 6, nylon 6-6, nylon 6-
10, polyamides such as nylon 11 and nylon 12, thermoplastic polyesters such as polyethylene terephthalate and polybutylene terephthalate, polycarbonate, polyphenylene oxide, etc., or mixtures thereof, or any resin such as silicone-based or urethane-based. . From these synthetic resins, a plurality of synthetic resins are appropriately selected and used to form each synthetic resin layer of the aggregate molded body, taking into consideration molding conditions, usage, properties, price, etc. Polyolefin resins, particularly polypropylene, are preferably used as aggregate resins in terms of adhesive properties, impact resistance as molded products, weather resistance, etc. However, avoid molding the same resin directly into each other. In addition, these synthetic resins may be foamed with a foaming agent as necessary, or wood flour or fiber pieces may be used to the extent that the required physical properties are not impaired, or for the purpose of roughly improving the physical properties.
An inorganic filler or the like may be mixed. By forming the aggregate molded body into multiple layers, it is possible to obtain a laminated molded body having various arbitrary physical properties. In particular, it is preferable to make at least one of the synthetic resin layers constituting the aggregate molded body a synthetic resin foam in order to improve the physical properties of the molded product. When the molded article of the present invention is used in a bumper or an instrument panel, it is preferable to include such a foam layer from the viewpoint of shock absorption. For example, when an aggregate molded body is made of two layers, the layer on the skin layer side is molded with foamed resin, and the other layer is made of a harder resin, so that the other layer becomes the core material. It is possible to obtain a laminated molded product with high properties, making it ideal for bumpers and instrument panels. At least one of the synthetic resin layers constituting the aggregate molded body
When making two layers of synthetic resin foam, the synthetic resin layer on the skin layer side is not limited to the foam layer, and depending on the case, foam layers and unfoamed resin layers may be laminated alternately. . The thermoplastic elastomer described above is suitable as the synthetic resin forming the foam layer, and is even more suitable when the foam layer adheres to the skin layer and a film or sheet made of the thermoplastic elastomer is used as the skin layer. . Next, the thermoplastic elastomer sheet or film can be molded by a T-die method, an inflation method, or the like. For example, a blend of a partially crosslinked product of a polyolefin resin and an ethylene/α-olefin polymer rubber is
The sheet-like thermoplastic elastomer is extruded from an extruder at ~250°C using a T-die method, and the extruded molten thermoplastic elastomer is taken off and molded with a pair of rolls. At that time, if one of the pair of rolls is an embossing roll heated to 60 to 70°C and the other is a normal unheated roll, one side of the sheet can be embossed during production. If the material treated in this manner is used, gloss will not be produced when integrally molded with the aggregate molded product. The embossing process can also be performed using a mold as in the examples described later. If necessary, characters, pictures, and patterns are printed on the sheet or film used in the present invention by a printing process. The above-mentioned manufacturing method will be explained in more detail by referring to an apparatus for carrying out this method.
As shown in Figures (a) to (g), an injection molding mold having a single female mold 1 and a plurality of male molds (2a, 2b) whose cavities differ in size when combined with this female mold. It has a mold. and,
An air suction path 7 connected to a vacuum pump 6 is formed in the female mold 1 to create a negative pressure inside the cavity 3. Further, the inner wall surface of the cavity of the female mold 1 is engraved with an embossed or textured pattern, if necessary. With the pair of male and female molds (1, 2a) open, the sheet or film 4 is stretched to cover the cavity opening of the female mold 1, and a preheating device is applied to the sheet or film 4 at the opening. The heater section 5 is brought close to perform preliminary heating. The preheating temperature is 150 to 200°C. Preheating can be carried out by various means such as not only the approach of the heater section 5, but also the blowing of warm air, contact with a heating roll, etc. Thereafter, the inside of the cavity 3 of the female mold 1 is made negative pressure by suction by the vacuum pump 6, and the sheet or film 4 is brought into close contact with the inner wall surface of the cavity (FIG. 1(b)). At this time, since the sheet or film 4 uses the thermoplastic elastomer having the above-mentioned structure, it adheres very well to the cavity shape of the female mold 2a, and does not form cracks or wrinkles in some parts. In addition, since it digs deeply into the unevenness forming the grain pattern, the grain pattern can be transferred very well. Thereafter, the heater part 5 is evacuated, and the female mold 1 is combined with the male mold 2a having a small cavity and the molds are clamped, as shown in FIG. The first synthetic resin P1 is drawn out and filled. After the first synthetic resin P1 is solidified in the cavity 3 by cooling, etc., the male mold 2a is replaced with the male mold 2b, which has a larger cavity 3, and the mold is tightened (Fig. 1(d)(e)) and pulled out. The second synthetic resin P2 in a flow plasticized state is drawn out and filled into the cavity 3 from the molding machine 8 (FIG. 1(f)). Then, when the second synthetic resin P2 is solidified, the mold (1,
2b) and take it out as a product (Fig. 1(g)). Note that trimming for taking out the product can be performed within the mold (1, 2b) at the same time as mold clamping, so trimming in a post-process is not necessary. By the way, in actual manufacturing, two male molds 2a,
2b are integrally installed back to back, and the female mold 1 is connected to one of the male molds 2.
A plurality of male molds 2 can be provided so that they can be reversed and moved from a position facing the male mold 2b to a position facing the other male mold 2b.
Efficient manufacturing can be performed without the need for replacing parts a and 2b. Further, in the manufacturing method, a mold for vacuum forming the thermoplastic elastomer sheet or film by suctioning it tightly against the inner wall surface of the cavity, and a mold for molding the laminate molded product of the present invention are separately prepared. First, the thermoplastic elastomer sheet or film preform is vacuum formed in a vacuum forming mold, this preform is installed in the cavity of the mold, and then a plurality of male The molds (2a, 2b) may be sequentially used and clamped, and the synthetic resin in a fluidized plastic state may be sequentially drawn and filled into the cavity for molding. In the above description, the synthetic resin in a fluidized plasticized state is, for example, a molten resin obtained by heating and kneading◆dispersion in a screw extruder, or a resin brought into a fluidized plasticized state with a solvent. Moreover, although the case of two male molds has been described, three or more may be provided, and the aggregate molded body may be formed in three or more layers. The molded product of the present invention is not limited to the above-mentioned uses, but can also be used for other exterior parts of automobiles, such as side moldings, outer panels, emblems,
It can be widely used as other automobile interior parts, such as console boxes, door linings, dash side, rear side lining moldings, various casings for home appliances, bags, and other cases. [Examples] Examples of the present invention will be described below. Prior to implementation, four types of thermoplastic elastomer films A, B, C, and D below were manufactured. In addition, a female mold 1 and a first male mold 2a were prepared, and a second male mold 2b whose cavity size when combined with the female mold 1 was larger than that of the first male mold 2a was prepared. Then, the above-mentioned film is heated in advance, and if surface treatment is required, the treated side is placed on the female mold side, and the film is suction-adhered to the inner wall surface of the cavity of the female mold 1 by vacuum forming to form a pattern. The first male mold 2a was closed and the first synthetic resin P1 in a molten state was drawn out from an injection molding machine and filled into the cavity 3 from the male mold 2a side. After that, when this first synthetic resin P1 is solidified and integrated with the film, the mold (1
゜2a), and replace the first male mold 2a with the second male mold 2.
The mold was clamped at b, and the second synthetic resin P2 in a molten state was drawn out from the injection molding machine and filled into the cavity 3 from the male mold 2b side. After this second synthetic resin P2 was solidified, it was taken out as a product. The inner wall surface of the cavity of the female mold was embossed to a depth of 150 u, and the laminate molded product was evaluated for adhesion between the film and the aggregate molded product, emboss depth, soft feel, and gloss. Table 1 shows an overview of the examples described below. First, here, TPE refers to thermoplastic elastomer, and PP
is an abbreviation for polypropylene, and engineering plastic is an abbreviation for engineering plastics, and corresponds to ■■■■ in the second synthetic resin below. (1) First, the film used here will be explained. (Film A) First, a thermoplastic elastomer was manufactured in the following manner using the following components. (Component A) Ethylene/propylene/ethylidene norbornene ternary copolymer rubber; ethylene unit/propylene unit (mole ratio): 7B/22, iodine value 15, Mooney viscosity (MLI+4.121°C) 61° (Component B) Iso Static polypropylene resin; melt index 13 g/10 minutes, (230°C). (Component C) Naphthenic process oil. (Component D) A mixture consisting of 20% by weight of 1,3-bis(tert-butylperoxyisopropyl)benzene, 30% by weight of divinylbenzene and 50% by weight of paraffinic mineral oil. (Production method of D plastic elastomer) 55 parts by weight of the above (component A), 45 parts by weight of (component), (
After kneading 30 parts by weight of component C) in a Banbury mixer at 180° C. for 5 minutes in a nitrogen atmosphere, the resulting kneaded product was cut into square pellets with a sheet cutter. 1 part by weight of (component D) was kneaded with 100 parts by weight of this square pellet using a Henschel mixer, and extruded at 220°C in a nitrogen atmosphere using an extruder to obtain a thermoplastic elastomer. (Production method of film) The thermoplastic elastomer thus obtained was
Using a mmφ T-die extrusion molding machine, the screw was in full flight, L/D was 22, and the extrusion temperature was 22.
The T-die is a coat hanger die, and it is extruded into a sheet with a thickness of 0.5 mm under the conditions of a take-up speed of 5 m/min.
) to obtain film A. (Film B) A coating solution for forming a first primer layer consisting of 10 parts by weight of chlorinated polypropylene, 2 parts by weight of silicic anhydride, and 88 parts by weight of toluene was applied once to Film A using a 120-mesh gravure roll. It was dried at ℃ for 20 seconds. On top of this, 8 parts by weight of polyvinyl chloride, 2 parts of pigment Ml-B
A coating liquid for forming a second brimer layer consisting of 90 parts by weight of n and methyl ethyl ketone was used to print a cloud pattern using a gravure roll, and then dried again at 70° C. for 20 seconds. Next, 5 parts by weight of polyvinyl chloride, 5 parts by weight of polyacrylic acid ester, 3 parts by weight of silicic anhydride, and 8 parts by weight of methyl ethyl ketone.
7 parts by weight of a coating solution for forming a top coat layer, 10 parts by weight
It was applied once using a 0 mesh gravure roll. This film was heated using a far-infrared heater until the surface temperature reached 180° C., and embossing was performed to obtain film B. (The thermoplastic elastomer used to form Film A from Film C (・Mar 8
0 parts by weight, low density polyethylene [density 0. 91
7 g7am37 heavy index 6.5g/10 minutes (
190° C.) 120 parts by weight of tri-blend, the resulting blend was fed to a T-die extruder, and then film C was obtained in the same manner as in the manufacturing method of film A. (Film D) Film D was obtained by subjecting Film C to the same surface treatment as Film B. (Comparative film) In addition to the above films, DOP
A flexible PVC film containing 50 parts was prepared. (2) Next, the first and second synthetic resins (Pl, P2), which are the molding materials for the aggregate molded body, were selected from the following.

[Example of first synthetic resin] ■('<TPE(1)>> Ethylene-propylene-ethylidenenorbornene copolymer rubber with ethylene content of 70 mol%, iodine value of 15, and Mooney viscosity of MLl+4 (100°C) 120) (below,
EPDM (1)) 70℃ parts, melt index (ASTM D-1238-65T, 230℃) 1
3. Polypropylene with a density of 0.91 g/cm3 (hereinafter referred to as
PP) 30 parts by weight, butyl rubber (manufactured by Esso 11
R-065, unsaturation degree 0.8 mol%, hereinafter abbreviated as IIR) 10 weight parts and paraffinic process oil (hereinafter abbreviated as oil) 30 weight parts were mixed in a Banbury mixer in a nitrogen atmosphere for 190' After kneading at C for 5 minutes, the mixture was passed through a roll to produce a square pellet using a sheet cutter. Next, 100 parts by weight of this square pellet) and 1.3-bis (
tert-butylperoxyisopropyl)benzene (
0.3 parts by weight of peroxide (hereinafter abbreviated as A)) and 0.5 parts by weight of divinylbenzene (hereinafter abbreviated as DVB) were stirred and mixed using a Henschel mixer. Then, the pellets were extruded with an extruder at 220°C under a nitrogen atmosphere, and M
Thermoplastic elastomer (TPE) with FR3g/lomin
(1)) was obtained. ■<<TPE (2)) A pellet-like ethylene propylene-ethylidene norbornene copolymer rubber (hereinafter referred to as 60 parts by weight of EPDM (referred to as (2)) (therefore, 43 parts by weight of EDPM and 17 parts by weight of 17 parts by weight), 40 parts by weight of PP, 2.5 parts by weight of dimethyl-2
, 5 di(t-butyl peroxy)hexyne-3 (hereinafter abbreviated as peroxide (B)) 0.5 parts by weight were stirred and mixed using a Henschel mixer. Next, this mixture was heated in a Warner twin screw extruder (L/D=43, intermeshing type, open rotation, three thread type screw) under a nitrogen atmosphere at 220
It was extruded at ℃ to obtain a thermoplastic elastomer (TPE (2)) with an MFR of 15 g/10 ml. ■<<TPE (1) Expanded packaging) 100 parts by weight of the above TPE (1) mixed with 1.5 parts by weight of a foaming agent and pultrusion molded. Foaming agent is Vinyhole AC
-3 (trade name of azodicarbonamide manufactured by Eiwa Kasei Co., Ltd.)
It is. ■<<TPE (2) Foaming) 100 parts by weight of the above TPE (2) was mixed with 1.5 parts by weight of a foaming agent and pultrusion molded. The blowing agent is the same as in (■). ■<<TPE (3)>> 1 part by weight of maleic anhydride was grafted to TPE (1) during production. ■<<TPE (4)>> 1 part by weight of maleic anhydride was grafted during the production of TPE (2). ■<<TPE (3) Foaming) To 100 parts by weight of the TPE (3), add 1°5 weight of a foaming agent, 13? , E combined and pultrusion molded. The packaging agent is ■
is the same as ■<<TPE (4) Foaming) 100 parts by weight of the above TPE (4) was layered with 1.5 parts by weight of a foaming agent and pultrusion molded. The packaging agent is the same as ■.

[Example of second synthetic resin] ■<<PP(1)>> Melt index (ASTM D, -1238-6
5T, 230°C) = 13, polypropylene with a density of 0.91 g/Cm3. ■<<PP(2>>> MFR8 polypropylene containing 20% fine powder talc. ■<<PP(3))> MFR5 polypropylene containing 10% fine powder talc and 10% short fiber glass fiber. ■ (Polyamide) Nylon 6-6 type Lockwell strength R-110 ■ (Polycarbonate) ■ (Polyphenylene oxide) Abbreviated as PPO in the table. ■<<ABS>> (3) In this example, the vacuum forming conditions are as follows. Heater temperature: 360°C Preheating temperature: 45 seconds Vacuum pressure near 00 mmHg (4) The injection molding conditions in this example are as follows. Molding machine: Dynamelter (manufactured by Meiki Seisakusho) Molding temperature: 220°C However, molding temperature when using the above ■Nylon 6-6, ■Polycarbonate, ■Polyphenylene oxide, ■ABS Injection pressure: -Next Pressure 1000 kg/cm2 Secondary pressure 700 kg/cm2 Cutting speed; Maximum molding cycle; 90 seconds/1 cycle Gate; Direct gate (land length 10 mm, middle gate 10 mm, thickness 3 mm) Molded product: length 500 mm, radius 400 mm , thickness 3 mm (5) Next, a method for evaluating the laminated molded product in this example will be explained. (Sample collection method) As shown in Figure 2, from the molded product,
mm, peel test piece 20 with a radius of 25 mm and a length of 100 mm
, and a 100 mm wide strip test piece 21 was punched out. (Peeling test) The thermoplastic elastomer film of the skin layer was peeled off from the edge of the peeling test piece, and the film was pulled in a 180-degree reverse direction at a speed of 2.
The film was peeled off by pulling at 5 mm/min, and the adhesion strength at that time was evaluated. The adhesion strength was expressed as the peel load divided by the width of the test piece. The results are shown in the second page. However, if the film was damaged, it was written as "material damage." (Round peeling test) With a sharp razor, make 11 parallel scratches with a depth of 1 mm on the film surface at 2 mm intervals, and then make 11 parallel scratches at right angles to the scratches. As a result, 100 squares cut into 2 mm squares are formed. Sellotape manufactured by Nichiban Co., Ltd. was applied so as to cover all of these 100 haiku, and the applied tape was vigorously peeled off to observe the peeling state. The peeling condition was evaluated by dividing the number of peeled pieces out of 100 by dividing the number of pieces remaining without peeling. 10
0/100 indicates no peeling, 0/10
0 indicates a completely peeled off state. The results are shown in Table 2. (Emboss depth) The distance from the top of the emboss transferred to the surface of the skin layer made of thermoplastic elastomer to the bottom of the valley was measured. The results are shown in the second page. (Software) A strength test was conducted using JIS-C type. (Cross) Light was irradiated onto the surface of the embossed skin layer at an angle of 60 degrees, and the reflectance was expressed as a percentage. (Appearance inspection) When the appearance of the molded product was inspected with the naked eye, no defects in molding such as cracks or wrinkles were found in the skin layer. [Effects of the Invention] According to the present invention, by using the thermoplastic elastomer as a molding material for the skin layer, the suction adhesion to the inner wall surface of the cavity during vacuum molding is extremely good, and there is no molding defect. It can also handle complex three-dimensional shapes. and,
During vacuum forming, it digs deeply into the grooves of the embossed and other textured patterns on the inner wall of the cavity, making it easy to form textures. The molded product according to the present invention is formed by laminating the skin layers made of the thermoplastic elastomer, so the molded product has excellent surface flexibility, feels good to the touch, and has excellent scratch resistance. can do. Therefore, the interior and exterior parts of automobiles,
It can be suitably used as home appliance parts, bags, cases, etc. In addition, since the aggregate molded body is formed in two or more layers, it is possible to improve the physical properties as desired.Also, even if synthetic resin has poor adhesion to the skin layer, synthetic resin with good adhesion can be used with the skin layer. It has the advantage that it can be used interposed between layers.

[Brief explanation of the drawing]

FIGS. 1(a) to 1g) are process diagrams showing the manufacturing method of the present invention, and FIG. 2 is a plan view showing the sample collection method. 1.2a, 2b・* Mold (female mold 1. male mold 2a, 2b),
3. Cavity, 4. Sheet or film, 5
...Heater part, 6..Vacuum pump, 7..Air suction path,
8.. Injection molding machine, 10.. Extruder, 11.. Injection nozzle, Pl.. first synthetic resin, P2.. second synthetic resin.

Claims (5)

[Claims] (1) A skin layer made of a thermoplastic elastomer made of a blend of a polyolefin resin and a partially crosslinked product of ethylene/α-olefin polymer rubber is applied to the surface of an aggregate molded body made of at least two synthetic resin layers. A laminate molded product characterized by being formed by laminating layers. (2) The laminate molded product according to claim 1, wherein at least one of the synthetic resin layers constituting the aggregate molded product is a synthetic resin foam. (3) The laminate molded article according to claim 1, wherein the thermoplastic elastomer is obtained by graft polymerization with the addition of maleic anhydride. (4) For one female mold, prepare multiple male molds with different sizes of cavities when combined with this female mold, and create a partially crosslinked product of polyolefin resin and ethylene/α-olefin polymer rubber. After preheating a thermoplastic elastomer sheet or film made of a blend of The mold is clamped, and the first synthetic resin in a fluidized plastic state is injected and filled into the cavity.Then, a mold of a cavity larger than the first male mold is used in place of the first male mold used previously. The mold is clamped with the second male mold, and the second mold, which is in a fluidized plastic state, is placed in the cavity formed between the molded body made of the first synthetic resin in the previous step and the second male mold. 2. A method for producing a laminate molded product, which comprises injecting and filling the synthetic resin of No. 2, and repeating this exchange of the male mold at least once. (5) A mold for vacuum forming the thermoplastic elastomer sheet or film by suctioning and adhering it to the inner wall surface of the cavity, and placing the vacuum-formed thermoplastic elastomer sheet or film preform into the cavity. The molding molds that are mounted and clamped are separate from each other, and the latter molding mold is a mold that has a plurality of male molds with cavities of different sizes relative to one female mold. The invention is a mold, and the vacuum-formed preform is attached to a female mold of a molding die, and then a plurality of male molds are used to inject and fill the synthetic resin multiple times to mold the product. A method for producing a laminate molded product according to scope 4.