JP3380479B2 - Slush molded skin and molded article using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slush molded skin and a molded product using the same, and more specifically, it can be used for recycling and has a texture and a soft feel with an outer layer having a texture and stitches. The present invention relates to a slush-molded skin having a certain feeling of corrosion and a molded body using the same.

[0002]

2. Description of the Related Art As a method for producing a resin molded article such as an instrument panel, a door rim, a console box, etc., which is an interior part of an automobile, a blended resin of vinyl chloride and ABS resin is extruded into a sheet shape, and then an etching squeezing roll is used. After a pattern is placed, the skin material shaped by vacuum molding and the core material (base material) shaped by injection molding or stamping molding are placed in a urethane foam mold, and then urethane foam is injected to integrally mold the material. The method was the mainstream.

The problem with this method is that it does not appear to have a sufficient skin-drawing feeling due to the etching stop, and that the stop is enlarged and becomes shallower due to the stretching of the sheet by vacuum forming. Further, when considering recycling of parts, there is a problem that the above-mentioned three-layer structure cannot be easily separated, and the cost of waste disposal increases. Further, since the above-mentioned construction method comprises three steps of skin molding, core material molding, and foam molding, it was also evaluated that the foam molding for obtaining the soft feeling of the product would be too costly.

Therefore, as a method for removing urethane, a method for obtaining a molded product which is less distorted by a low pressure and is less deformed,
Injection method Press molding method or SP mold (Low
What is called Strain Molding Process is known. This is a composite sheet lined with polypropylene foam on a calendered or extruded sheet by vacuum forming, set in a female mold for injection molding, and inject the core resin with the mold open, then mold Is closed, and the skin material and the core material are integrally molded.

On the other hand, as a method for reproducing the feeling of squeezing the genuine leather, there has been conventionally a slush skin forming using an electroforming mold, and a vinyl chloride skin, a vinyl chloride foam using this method,
The integrally foamed product of the core has been adopted as a product having an excellent squeezing feeling.

[0006]

However, as a drawback of the SP molding method, since the skin material is preliminarily processed into a sheet, 50 to 60% of the skin end material is generated at the time of integral molding. It is evaluated that the cost reduction effect is small despite the lack of quality and poor texture.
In addition, the vinyl chloride skin obtained by slush molding, the vinyl chloride foam, and the integral foamed product of the core are
Although the amount of the end material of the skin is as small as 30 to 40%, it is evaluated that the cost is high because the urethane foaming step is required.
Moreover, this product could not be recycled.

Therefore, by combining a multilayer skin material obtained by slush molding with a low-pressure injection molding method such as the SP molding method, a resin molding having a soft feeling in which the skin material is firmly adhered to the core material is obtained. Consideration is being made. The skin material is usually three layers composed of a thermoplastic elastomer, the first layer is a solid layer, the second layer is a foam layer, the third layer is a solid layer, and the first layer is a foam layer of the second layer during low pressure injection molding. It protects the layers from collapsing. And, the materials were almost the same for each layer, sometimes the first and third layers were the same, and the second layer often only had a blowing agent added to it.

In the method for producing the above-mentioned three-layer skin material, first, the mold for slush molding is heated to a predetermined temperature, the powder resin composition for the first layer is charged into the mold, and the mold is inverted after a certain time has elapsed. , The excess powder resin composition is discharged to a recovery box to form a first layer adhered to the mold surface, and then the powder resin composition for the second layer containing a foaming agent is put into a mold and discharged. After forming the second layer and further depositing and forming the third layer in the same manner, cure foaming was performed, and the mold was cooled to remove the three-layer skin material. At this time, the mold was heated by circulating a pipe around the back surface of the electroforming mold, and circulating heating oil in the mold, which is advantageous for maintaining stable mold temperature until the third layer is attached. There is a problem that heating is performed only from the mold surface side, it takes time to transfer heat, and it takes a long time to cure and foam.

Therefore, in the case of producing a multi-layer skin, the mold is usually heated in a hot-air heating furnace, ejected from the furnace to perform multi-layer adhesion molding, and then put in the same or another hot-air heating furnace again to mold surface. In many cases, curing foaming is performed by heating from both the back surface of the skin. However, in this method, the mold temperature from the introduction of the first layer to the introduction of the third layer is lowered by 50 ° C or more, and sometimes lowered by about 100 ° C. When the same material is used for the first layer and the third layer, the third layer does not adhere sufficiently and cannot play a role of protecting the second layer in the low pressure injection molding of the next step. The layer was crushed and irregularities appeared on the surface.

Further, the hot air temperature is 300 ° C. or higher, and the temperature tends to be higher due to the increase in productivity. Due to thermal oxidation deterioration of the third layer, blisters and cracks are formed to protect the second layer. In some cases, it did not fulfill. Furthermore, the usual slush molding material uses a material with high melt fluidity, but if the third layer also uses a material with high melt fluidity similar to the first and second layers, dripping and flow occur. However, it lacks the role of protecting the second layer, and in reality, the three-layer structure still has many technical improvements.

The present invention solves the above problems by providing a cushioning property to the inner layer by using a two-layered outer skin consisting of a solid outer layer and an inner layer of a foamed layer, and a skin texture or stitch on the outer layer. It is an object of the present invention to provide a reusable slush-molded skin that is provided with the like to enhance the designability and has a soft feeling of corrosion, and a molded body using the same.

[0012]

That is, according to the invention of claim 1 of the present application, in a slush molded skin formed by laminating at least an outer layer made of a solid layer and an inner layer made of a foam layer, at least polypropylene is used as the outer layer. Powder of a thermoplastic elastomer composition comprising a resin, hydrogenated styrene butadiene rubber, process oil, an elastomer having excellent oil absorption ability, and an internal mold release agent is slush molded, and at least a polypropylene resin and hydrogenated styrene butadiene rubber are used as the inner layer. , Process oil, elastomer with excellent oil absorption, internal release agent,
A slush molded skin obtained by slush molding a powder containing a blowing agent and an olefin-based polymer having active hydrogen . The slush-molded skin is produced by continuously slush-molding at least two layers consisting of an outer layer and an inner layer, and the outer layer has leather grain and stitches and the like and has excellent designability and mold releasability. On the other hand, the inner layer is a slush molded skin that retains the foam layer and has a soft feeling and a corrosive feel that can be recycled and that has an active hydrogen.
By using a base polymer as an adhesion improver,
Adhesion is also improved .

[0013]

In the invention according to claim 2 of the present application, the surface of the outer layer is
The surface is on a slush molded skin with a coating film formed .

In the invention according to claim 3 of the present application, the outer layer and the inner layer
The long-chain branched structure is an elastomer with excellent oil absorption used in the layer.
It is in the slush molded skin which is an ethylene-octene copolymer with a structure .

In the invention according to claim 4 of the present application, a molded product with a slush molded skin formed of a laminate of a slush molded skin formed by laminating at least an outer layer made of a solid layer and an inner layer made of a foam layer, and a core body. In the above, the slush molding surface is at least polypropylene resin, hydrogenated styrene butadiene rubber, process oil, an elastomer having an excellent oil absorbing ability, and slush molding a powder of a thermoplastic elastomer composition comprising an internal release agent, and further as an inner layer thereof. Polypropylene resin, hydrogenated styrene butadiene rubber, process oil, elastomer with excellent oil absorption, internal release agent, foaming agent, and active
Is a composite skin obtained by slush molding a powder containing an olefinic polymer having a volatile hydrogen , and the core material is a slush molded skin with an olefinic resin in a molded body with a crease or stitch. It is a molded product that has a design and a soft feeling of corrosion, and can be recycled.

[0017]

According to the invention of claim 5 of the present application, there is provided a slush molded skinned molded article having a coating film formed on the surface of the outer layer.

In the invention according to claim 6 of the present application, the elastomer having excellent oil absorbing ability used in the outer layer and the inner layer is a molded product with slush molded skin which is an ethylene-octene copolymer having a long-chain branched structure.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing the entire appearance of an automobile instrument panel, which is one of the above-mentioned molded products with a skin, FIG. 2 is a sectional view taken along line XX of FIG. 1, and FIG. A
FIG. According to this, the instrument panel 1 is divided into the soft portion 2 and the hard portion 3, and in the soft portion, the slush molded skin 4 composed of two layers of the outer layer 4a and the inner layer 4b having the textured pattern is formed on the surface. And a core material 5 made of synthetic resin is laminated on the back surface. On the other hand, the hard portion 3 is composed only of the core material 5.

The slush molded skin 4 is a composite skin composed of an outer layer 4a and an inner layer 4b. The outer layer 4a is composed of at least polypropylene resin, hydrogenated styrene butadiene rubber, process oil, an elastomer excellent in oil absorbing ability, and an internal release agent. The powder of the thermoplastic elastomer composition is formed by slush molding.

On the other hand, the inner layer 4b has at least the same polypropylene resin as the outer layer 4a, hydrogenated styrene-butadiene rubber, process oil, and an elastomer excellent in oil absorption,
Olefie with internal mold release agent, blowing agent, and active hydrogen
It is a slush-molded powder of a thermoplastic elastomer composition containing a polymer . In addition, active hydrogen
The olefin-based polymer (adhesion improver) possesses adhesiveness
Add to improve.

Since the outer layer 4a contains an internal mold release agent, the mold releasability from the mold is improved, and the inner layer 4b contains an adhesion improving agent, so that the adhesive force with the core material 5 is improved.

On the surface of the outer layer 4a, a coating film (not shown) made of urethane or acryl urethane may be formed to reinforce the surface of the outer layer 4a to prevent external damage. It is desirable to use a surface treatment agent for firmly adhering the coating film to the outer layer 4a.

The polypropylene resin used for the outer layer 4a and the inner layer 4b may be either a polypropylene homopolymer or a block or random copolymer with an α-olefin, but particularly a block or random copolymer with ethylene as an α-olefin. Coalescence is preferable from the viewpoint of flexibility of the molded body. Further, in order to use it for powder slush molding without applying pressure, it is used as an index of the melt fluidity of polypropylene resin according to JIS K7210.
It is necessary that the MFR (melt flow rate) measured at 0 ° C and a load of 2.16 kgf is 20 g / 10 minutes or more. The polypropylene resin is a polymer whose main chain is cleaved by heat or oxidation, and has a property different from that of polyethylene which is crosslinked and hardened, and its main chain is cleaved by an organic peroxide, and the molecular weight is reduced.

The hydrogenated styrene-butadiene rubber (H-SBR) used for the outer layer 4a and the inner layer 4b has excellent compatibility with the polypropylene resin, and when kneaded with the polypropylene resin, it becomes flexible and bends or whitens. A difficult thermoplastic elastomer composition is obtained. The styrene content of the hydrogenated styrene-butadiene rubber is preferably 30% by weight or less, and 5 to 15% by weight is suitable for obtaining a highly flexible skin.

H-SBR differs from SEBS, which is a block copolymer, in that styrene-butadiene rubber in which styrene and butadiene are randomly copolymerized is hydrogenated. A typical example is the Dynaron series, a product manufactured by Japan Synthetic Rubber Co., Ltd.

The polypropylene resin and H-SBR are mixed in a weight ratio of 80/20 to 20/80,
When the amount of polypropylene resin is large, the molded skin becomes hard, while when it is small, the tensile strength is lowered.

Further, by adding the process oil to the outer layer 4a and the inner layer 4b, it is absorbed by the elastomer component in the composition to lower the melt viscosity, and also has the effect of lowering the hardness of the skin and giving flexibility. The above process oil is used for rubber and is classified into paraffin type, naphthene type and aromatic type, but paraffin type is preferable due to its compatibility with the elastomer component. The addition amount is 5 to 20 parts by weight with respect to 100 parts by weight of the elastomer having excellent oil absorbing ability.
0 parts by weight is preferred. If it exceeds 200 parts by weight, the tensile properties are deteriorated, and if it is less than 5 parts by weight, the melt viscosity does not decrease and the skin becomes hard.

The elastomer having an excellent oil absorbing ability used for the outer layer 4a and the inner layer 4b is compatible with the polypropylene resin and has a property of absorbing the process oil and the oligomer component in the composition. Styrene block copolymer thermoplastic elastomers such as ethylene butylene / styrene block copolymer (SEBS) and styrene / ethylene propylene / styrene block copolymer (SEPS), olefin crystals / ethylene butylene /
There are olefin crystal block copolymers (CEBC), ethylene propylene rubber (EPR), and ethylene octene copolymers (POE).

In particular, the above POE is a catalyst centered on a metallocene compound and has one reaction site (site) per molecule (single), and is obtained by using a single-site catalyst in which active species are homogeneous at the site. It is a polymer with a long-chain branched structure, a narrow molecular weight distribution, a uniform composition distribution, and a low content of low molecular weight oligomers and waxes. Therefore, when blended with polypropylene resin, it has better fluid dispersibility than EPDM (ethylene / propylene / non-conjugated diene copolymer) and has the property of being easily finely dispersed in polypropylene resin, making it a material suitable for slush molding. . Also,
The POE has a molecular structure different from that of a straight-chain POE polymerized by a general Ziegler-Natta catalyst, for example, a general-purpose ethylene propylene rubber obtained by copolymerizing ethylene and propylene.

The SEBS is a styrene / butadiene / styrene block copolymer (SBS) that has been hydrogenated, and the Crayton G series manufactured by Shell Chemical Co., Ltd. and the Tuftec H series manufactured by Asahi Kasei Co., Ltd. Can be mentioned. In this SEBS, the strength increases as the styrene content increases, but the flexibility decreases. Also,
In the case of SEBS, the styrene hard segment may be aggregated by melting during slush molding, and it may be difficult to obtain a smooth sheet-shaped molded product. Therefore, the styrene content is preferably 40% by weight or less.

SEPS is a styrene / isoprene / styrene block copolymer (SIS) hydrogenated.
Septon, which is a product manufactured by Kuraray Co., Ltd., is typical. SE
Similar to BS, the flexibility decreases as the styrene content increases, so the styrene content is preferably 40% by weight or less.

The above-mentioned elastomer having an excellent oil absorbing ability is
The compatibility with polypropylene resin is inferior to that of H-SBR, and when kneaded and added to polypropylene resin, they are dispersed in a size of μm unit, so that the tensile properties tend to be deteriorated. However, polypropylene resin has HS
When BR and process oil are added, H-SBR
Has poor oil absorption, so the oligomer component in the composition has surface adhesion (bleeding) and has adhesiveness, and the elastomer powder pulverized using this for powder slush molding also has adhesiveness, making it easy to block. As a result, the fluidity of the powder and the releasability of the skin from the mold are lacking. When an elastomer having an excellent oil absorbing ability is added to this, the oligomer component and the oil in the composition can be absorbed to prevent surface migration.

The amount of the elastomer having an excellent oil absorbing ability to be added is 20 to 250 parts by weight with respect to 100 parts by weight of H-SBR. If it is less than 20 parts by weight, the oligomer component and oil in the composition cannot be sufficiently absorbed, and
If it exceeds 0 parts by weight, the dispersion with the polypropylene resin becomes poor and the tensile properties tend to deteriorate.

Examples of the internal release agent used in the outer layer 4a and the inner layer 4b include silicone oil such as dimethylsiloxane, methylhydroxypolysiloxane and methylphenylpolysiloxane, higher fatty acid, higher fatty acid amide, higher fatty acid salt and the like. . In the outer layer 4a, the amount added is preferably 0.1 to 5.0% by weight, and if it is less than 0.1% by weight, a sufficient releasing effect cannot be obtained, while if it exceeds 5.0% by weight, adhesion to the inner layer is achieved. Sex is disturbed. In the inner layer 4b, the addition amount is preferably 0.1 to 1.0% by weight,
If it is less than 0.1% by weight, the effect of suppressing the surface migration of the oligomer component of the composition, process oil, stabilizer, catalyst, etc. cannot be sufficiently obtained, while if it exceeds 5.0% by weight, the adhesiveness to urethane foam is high. Is hindered.

As the foaming agent used only for the inner layer 4b,
A chemical foaming agent made of azo dicarbonamide, dinitroso pentamethylenetetramine, 4,4'-oxybis benzene sulfonyl hydrazine or the like, or hollow beads such as microballoons are added. Specifically, a chemical foaming agent may be powder mixed,
You may add at the same time as kneading a composition. The kneading temperature at this time is lower than the decomposition temperature of the foaming agent, preferably 20 ° C. or higher.

The amount of the foaming agent added is polypropylene resin,
0.1 to 8 parts by weight per 100 parts by weight of a composition comprising hydrogenated styrene-butadiene rubber, process oil, and an elastomer having excellent oil absorption ability, or 100 parts by weight of a composition obtained by blending this composition with an olefin polymer having active hydrogen ,
It is preferably 0.5 to 4.0 parts by weight. If it is less than 0.1 part by weight, the foaming effect is small, while if it exceeds 8 parts by weight, the foam cells become coarse and the core material is easily broken by injection molding.

An acid-modified polypropylene resin, a hydroxyl group-containing polypropylene resin, as an olefin polymer having active hydrogen which is an adhesion improver used only in the inner layer 4b,
Hydrolyzate of ethylene / vinyl acetate copolymer, terminal carboxyl group polybutadiene, terminal hydroxyl group polybutadiene, terminal carboxyl group polybutadiene hydrogenated product, terminal hydroxyl group polybutadiene hydrogenated product, acid-modified styrene / ethylenebutylene / styrene block copolymer, ethylene / Methacrylic acid copolymers and ethylene / acrylic acid copolymers can be mentioned. In the examples, OH-modified polyolefin is used. This addition amount is 2 to 20
% Is preferable, and if it is less than 2% by weight, the effect of improving the adhesiveness is small.

As the heat stabilizer that can be used in the outer layer 4a and the inner layer 4b, those used in ordinary polyolefins can be used. Generally, phenol and a phosphorus-based antioxidant are used in combination, but they are not particularly limited. Further, as the light stabilizer, a hindered amine or benzotriazole type which is a radical scavenger may be used. Organic or inorganic pigments suitable for ordinary olefins are used. Further, lubricants such as fatty acid metal salts and fillers such as calcium carbonate and talc are added as needed.

In the present invention, the above-mentioned polypropylene resin,
An organic peroxide is added to a composition comprising a process oil, an elastomer having an excellent oil absorption ability, an internal mold release agent, etc., and an olefin polymer having active hydrogen is added to the composition, and these are heated. The organic peroxide cuts the main chain of the polypropylene resin, lowers the molecular weight of the polypropylene resin and increases the melt fluidity, and the resulting thermoplastic elastomer composition has high melt fluidity. There is an effect to have. Here, the organic peroxide is not used as a crosslinking agent. Further, the thermoplastic elastomer composition obtained by kneading under heating does not substantially contain the organic peroxide due to thermal decomposition.

The above organic peroxide is usually rubber,
Diacyl peroxide used for resin crosslinking,
Peroxyester, diallyl peroxide, di-t
-Butyl peroxide, t-butyl cumyl peroxide, dicumyl peroxide, 2.5-dimethyl-2
-5-di (t-butylperoxy) -hexane-3,1
-3-bis (t-butylperoxy-isopropyl) benzene, 1.1-di-butylperoxy-3,3,5-
Trimethylcyclohexane and the like are preferable, and one having a half-life of 1 minute by thermal decomposition of 150 to 250 ° C is preferable.

The organic peroxide cuts the main chain of the polypropylene resin to lower the molecular weight in the process of kneading under heating at 120 to 250 ° C., thereby giving the thermoplastic elastomer composition high melt fluidity. The addition amount of the organic peroxide is 0.02 to 5.0% by weight in the thermoplastic elastomer composition, and if it is less than 0.02% by weight, the decomposition ability to cut the main chain of the polypropylene resin is small, It becomes impossible to impart high melt fluidity to the thermoplastic elastomer composition. On the other hand, if it exceeds 5.0% by weight, decomposition becomes excessive and mechanical properties such as tensile strength of the powder molded product deteriorate.

Mixing of these blends is accomplished by mixing the given mixture with V
Dry blended using a mold blender, tumbler, Henschel mixer, etc., is supplied from the raw material supply hopper, and process oil is injected from the vent port.
It is melt-kneaded and pelletized by a twin-screw extruder whose temperature is adjusted to a range of 250 ° C. Of course, it is possible to knead in two times.

H-SBR which is an elastomer component by a kneader which is a closed type kneader, a Banbury mixer, etc.
Process oil is added to an elastomer with excellent oil absorption capacity and kneaded to form pellets, and then the pellets and polypropylene resin are mixed with an organic peroxide and other compounding agents to obtain a temperature range of 120 to 250 ° C. It is also possible to melt-knead and pelletize with a temperature-controlled single-screw or twin-screw extruder.

The melt flow rate (MFR) which is the melt viscosity of the obtained pellets is 2 according to JIS K7210.
It is preferably 50 g / 10 minutes or more at 50 ° C. and a load of 0.325 kgf. If it is less than this range, the melt fluidity of the composition tends to be low, and pinholes tend to occur in the skin.

The pellets obtained from the above compound are finely pulverized by using an impact type fine pulverizer such as a turbo mill, a pin mill and a hammer mill. At this time, it is usually frozen and pulverized using liquid nitrogen. Further, depending on the compounding, the molten resin can be pulverized by spraying or spraying with a disk atomizer and cooling. The crushed product has a particle size of at least 1,000 μm with a sieve etc.
Of which the average particle size is 100 to 800 μm is collected, and an organic or inorganic powdery modifier is added to and mixed with it to be used for powder slush molding.

Next, slush molding is performed using the powder of the above elastomer composition. In this molding, this is mainly dropped by gravity into a mold heated above the melting point of the composition used for the outer layer 4a, and the mold is inverted after a certain period of time, and the excess composition is collected in a recovery box. The composition adheres to the surface of the mold as a layer, and melts with the lapse of time to form an outer layer composed of a solid having a thickness of 0.3 to 1.0 mm. Subsequently, the composition used for the inner layer 4b is dropped onto the outer layer and charged, and after a certain period of time, the mold is inverted,
Collect excess composition in a collection bin. The layer adhered to the outer layer 4a is melted over time to form an inner layer made of a foamed layer. Then, the mold is cooled and slid to a thickness of 0.5 to
An inner layer of 1.5 mm is formed. Then, the mold is cooled and the slush molded skin 4 is demolded, and this is repeated.

As a method of heating the mold, a method of circulating oil or putting it in a hot air oven is generally used. The oil circulation makes it easy to adjust the mold temperature due to the pipe arrangement, but it is heated only from the mold surface. On the other hand, when a hot air oven is used, it is possible to heat from both the mold surface and the back surface of the molded product, but since hot air is often set to 300 ° C or higher in consideration of productivity, the heat on the back surface of the molded product is It is necessary to consider the prescription and conditions so as not to cause oxidative deterioration.

The hot air method is effective when performing powder slush molding in two layers. That is, the outermost layer of the first powder is slush-molded on the heated mold, the second powder is adhered in a semi-molten state to slush-mold, and then heat-melted. In this case, since heat transfer is insufficient by heating only from the mold surface side, a hot-air stove system that allows heating from the back surface of the molded product is often used.

As a method for producing a molded body using the slush molded skin 4, there are a method of injection molding a core material and a method of bonding the skin and the core material with an adhesive. In the method of injection molding the core material, the mold is closed in a state where the slush molding skin is fixed in the mold by a method such as vacuum suction so that the outer layer is in contact with the mold surface, and the olefin resin serving as the core material is injected, By cooling and solidifying in the mold, it is possible to obtain an all-olefin type molded body in which the skin and the core material are melt-bonded. In this case, fix the skin to the mold, inject a predetermined amount of olefin resin with the mold open, and then close the mold.
The method of compression injection molding is preferred. This is because the foamed inner layer is not destroyed by the injection resin. The olefin resin used here is most preferably a polypropylene resin.

As a method for adhering the outer skin and the core material with an adhesive, an olefin resin core material injection-molded into a predetermined shape in advance and a slush-molded outer material are adhered with a rubber adhesive. Olefin polymer having active hydrogen as an adhesion improver is blended in, and the injection-molded core material adhesive surface is subjected to flame treatment, corona discharge treatment,
A strong bond can be obtained by applying an ultraviolet treatment.

[0053]

Next, the present invention will be described in more detail with reference to specific examples. Example 1 As an outer layer, as shown in Table 1, polypropylene resin (P
P resin), elastomer with excellent oil absorption (POE), and internal mold release agent dry blended with a tumbler are supplied from a raw material supply hopper of a twin-screw extruder (PCM45 made by Ikegai Steel Co., Ltd.), and process oil is supplied. Cylinder temperature 210 ° C, screw rotation speed 3 while pouring from the vent port
The mixture was kneaded at 00 rpm, and then H-SBR, process oil, phenol-based antioxidant, and phosphite-based antioxidant were dry-blended and fed from the same feed hopper of the twin-screw extruder to supply process oil. The mixture was kneaded under the same conditions while being injected from the vent port, and extruded into pellets. In the table, the materials with the parts by weight in parentheses are those added for the second time. And turbo mill T250
-4J (manufactured by Turbo Kogyo Co., Ltd.) was charged with pellets dipped in liquid nitrogen and pulverized, and only a portion passing through a 1,000 μm sieve was collected to obtain a 180 μm powder. In the table, the materials with the parts by weight in parentheses are those added for the second time.

As the inner layer, as shown in Table 1, a powder obtained by adding 2.0 parts by weight of azo dicarbonamide powder as a foaming agent to 100 parts by weight of the powder of the outer layer and mixing with a Henschel mixer. It was used.

[0055]

[Table 1]

Next, slush molding was performed using the powder for the outer layer. As a method of slush molding, for example, 150 mm × 150 mm × 3 mm with a leather grain pattern
The plate is heated to 250 ° C in an oven, and about 800 g of the above powder is placed on it for about 10 seconds to allow it to adhere, and then the temperature is adjusted to 300 ° C except for the powder that did not melt and adhere. The outer layer was molded by heating for 60 seconds in the oven.
Then, when about 800 g of powder for the inner layer was placed on the outer layer for about 10 seconds, the inner layer was formed. After that, 30 again
Melt for about 60 seconds in an oven adjusted to 0 ° C, then remove from the oven and cool with water to form an outer layer (thickness 0.7
mm) and an inner layer (thickness 1.0 mm) was obtained. The hardness of the outermost layer (solid side) measured with a C-type hardness meter was 72 ° when three of the above-mentioned skins were overlaid.

Separately injection molded 150 × 150 × 3.5
mm of polypropylene resin was subjected to flame treatment. Contact
Lamination was performed using a commercially available rubber-based adhesive as the adhesive. Election
The molded body has a soft feel and strengthens the skin and core material.
When firmly adhered and peeled between them, the inner foam layer cohesively breaks.
broke.

[0058]

Comparative Example 1 Using the outer layer powder of Example 1, a solid skin having a thickness of 1.0 mm was slush molded in the same manner as in Example 1. The hardness of 6 layers of the skins measured by a C-type hardness tester is 9
It was 1 °. Further, the molded product produced by the same method as in Example 1 had a hard feel and was inferior in commercial property.

[0060]

As described above, in the slush molded skin described in the claims of the present application, and the molded body using the same, at least polypropylene resin, hydrogenated styrene butadiene rubber, process oil, an elastomer excellent in oil absorption capacity as an outer layer, Then, a powder of a thermoplastic elastomer composition comprising an internal mold release agent is slush molded, and at least a polypropylene resin, hydrogenated styrene butadiene rubber, process oil, an elastomer excellent in oil absorbing ability, an internal mold release agent, and a foaming agent as the inner layer. And a slush-molded skin obtained by slush-molding a composition to which an olefin polymer having active hydrogen as an adhesion improver is added. Even if a skin having a solid outer layer and an inner layer of a foam layer is used, the foam layer is Uses materials that are not damaged and can be recycled. The effect of epidermal remembering 蝕感 with soft feel with with a leather grain or stitching or the like to layer enhanced design properties, and molded product using the same are independent.

[Brief description of drawings]

FIG. 1 is an overall external perspective view of an automobile instrument panel according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an enlarged view of part A of FIG.

[Explanation of symbols]

1 Instrument panel 2 software department 3 hardware department 4 Slush molded skin 4a outer layer 4b inner layer 5 core material 6 foam layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI C08L 23/12 C08L 23/12 23/26 23/26 (72) Inventor Osamu Manahide 4-1-2-1, Hamazoe-dori, Nagata-ku, Kobe-shi No. Mitsuboshi Belting Co., Ltd. (56) Reference JP-A-5-221271 (JP, A) JP-A-9-52990 (JP, A) JP-A-7-173366 (JP, A) JP-A-7 -96532 (JP, A) JP 10-30036 (JP, A) JP 10-182900 (JP, A) JP 4-25517 (JP, A) (58) Fields investigated (Int.Cl) . ^7, DB name) B29C 41/18 B32B 27/32 B60R 21/20 C08L 15/00 C08L 23/08 C08L 23/12 C08L 23/26

Claims (6)

(57) [Claims] 1. A slush molded skin formed by laminating at least an outer layer made of a solid layer and an inner layer made of a foam layer, wherein the outer layer is at least excellent in polypropylene resin, hydrogenated styrene butadiene rubber, process oil and oil absorption ability. Elastomer, and slush molding a powder of a thermoplastic elastomer composition comprising an internal mold release agent, further at least polypropylene resin as its inner layer, hydrogenated styrene butadiene rubber, process oil, an elastomer excellent in oil absorption capacity, an internal mold release agent,
A slush molded skin, which is obtained by slush molding a powder containing a blowing agent and an olefin polymer having active hydrogen . 2. The slush molded skin according to claim 1, wherein a coating film is formed on the surface of the outer layer . 3. An oil-absorbing material which is used for the outer layer and the inner layer
Both ethylene and octene have long-chain branched structure
The slush molded skin according to claim 1 or 2, which is a polymer . 4. An outer layer comprising at least a solid layer and an outer layer.
A slush molded to stack inner layers of foam
A slush molded skin composed of a laminate of a molded skin and a core body
There is less slush molding skin in
Both polypropylene resin, hydrogenated styrene butadiene
Rubber, process oil, elastomer with excellent oil absorption,
And a thermoplastic elastomer composition comprising an internal release agent
Slush molding of the powder of
Both polypropylene resin, hydrogenated styrene butadiene
Rubber, process oil, elastomer with excellent oil absorption,
Olefie with internal mold release agent, blowing agent, and active hydrogen
By slush molding a powder containing a polymer
The resulting composite skin, and the core material is an olefin-based tree
Molding with slush molding skin characterized by being fat
Body . 5. A coating film is formed on the surface of the outer layer.
The slush molded molded article with skin according to claim 4 . 6. An outer layer and an inner layer which are excellent in oil absorbing ability.
Ethylene-octene copolymer which elastomer having a long chain fraction Toki structure
A slush-molded molded article with a skin according to claim 4 or 5, which is a polymer .