JP7249014B2 - Plastic composite product and its manufacturing method - Google Patents

Description

The present specification relates to a composite article of different plastic materials and a method of making the same.

BACKGROUND ART Conventionally, there are intention-expression-related products that have a contact portion that is brought into contact with a part of an individual animal such as a human to express its intention. Examples of products related to intention expression include switches, buttons, levers, keyboards, display panels, and the like. Such members are generally made of plastic materials, etc., and detect changes in pressure, temperature, shape, position, etc. based on contact, and convert them into electrical signals to express their intentions. based process can be started.

In addition to these products related to manifestation of intention, there are also products (hereinafter also referred to as other products) that have contact areas that are expected to come into contact with at least part of individual animals intentionally and/or unintentionally. . Examples of such products include furniture, medical equipment, nursing care equipment, robots, toys, computer peripherals, stationery, office supplies, daily necessities, electrical appliances, vehicle interior materials, etc. In the field, the use of plastic materials is also increasing.

Products related to manifestation of intention are required to have impact resistance suitable for repeated contact with a part of an individual, such as hands and feet, which is touched for manifestation of intention. For this reason, it is made of a plastic material that is relatively hard and rigid, or, depending on the application, is made of a silicone resin material that is flexible but has strength and stain resistance. In other products, various characteristics (for example, hardness, elasticity, flexibility, etc.) are realized by plastic materials depending on the functionality to be achieved by the parts to be contacted. For example, in the field of gaming machines, there is known a push-operable button cover capable of obtaining a visually innovative effect (Patent Document 1).

JP 2018-000225 A

However, as long as products related to manifestation of intention are members that come into contact with people, there are cases in which they are required to have unprecedented performance in expressing intention, tactile sensation, operational feeling, etc., in addition to impact resistance and stain resistance. For example, it has viscoelasticity that can change the level of intention expression depending on the pressing force when the hands and feet contact for intention expression, and it is possible to input the expression of intention regardless of the contact direction. , and that it is possible to express one's intention with a touch or action that has not existed in the past.

In addition, for other products, for example, while having appropriate viscoelasticity and impact resistance, appropriate surface properties such as non-adhesiveness, transparency, stain resistance, etc. There is also a growing demand to have surface properties that are not pleasing to the eye. Moreover, it was difficult for the button cover disclosed in Patent Document 1 to develop appropriate viscoelasticity.

To date, no single-piece body has been provided that possesses suitable surface properties while possessing impact resistance and the intended viscoelastic properties.

In view of such problems, the present specification provides a plastic composite product with impact resistance, viscoelastic properties and favorable surface properties.

The inventors of the present invention conducted various studies on gels having viscoelastic properties and plastic outer skins that follow the viscoelastic properties and exhibit appropriate surface properties. It was found that the combination of The present inventors have also found that by integrally molding a urethane gel and a soft acrylic resin skin, it is possible to provide a plastic composite product that exhibits impact resistance, viscoelasticity, and suitable surface properties. This specification provides the following means based on these findings.

(1) a gel body that is a urethane-based molding having viscoelasticity;
an outer skin, which is a soft acrylic molded body having a predetermined three-dimensional shape and which has a cavity opened to accommodate at least a portion of the gel body;
with
the gel body is provided to fill at least a portion of the cavity;
a first surface in contact with the inner surface of the cavity of the gel body is integrated with the inner surface due to the adhesiveness of the gel body,
a second surface that does not contact the inner surface of the cavity of the gel body is provided with a urethane-based coating;
A plastic composite product, wherein the gel body is deformed together with the skin when an external force is applied to the skin.
(2) The composite product of (1), comprising an internal cavity defined by at least a portion of the second surface of the gel body and open outwardly of the gel body.
(3) The composite product according to (2), wherein the internal cavity includes an elastic member that elastically deforms with deformation of the gel body.
(4) The composite product according to (3), wherein the elastic member is an elastically deformable plastic molding.
(5) The composite product according to any one of (1) to (4), wherein the skin is translucent and has a printed layer on the inner surface of the skin.
(6) The composite product according to any one of (1) to (5), wherein the gel body and the skin are translucent.
(7) The composite product according to any one of (1) to (6), further comprising a light irradiation device for transmitting light through at least a portion of said second surface of said gel body.
(8) The composite product according to any one of (1) to (7), wherein the urethane-based molded product is an ether-based urethane resin molded product.
(9) The composite product according to any one of (1) to (8), wherein the urethane-based coating is an ether-based urethane resin coating.
(10) A method for manufacturing a plastic composite product,
A urethane-based resin material is supplied to the cavity of the outer skin that is a soft acrylic molded body and has an open cavity, and the urethane-based resin material is cured to at least part of the cavity of the outer skin. A step of integrating the urethane-based resin gel body so as to fill the
forming a urethane-based coating on a surface of the gel body that does not contact the inner surface of the cavity;
A manufacturing method comprising:
(11) The manufacturing method according to (10), wherein the outer skin is translucent, and the step of imparting one or more visible elements to the inner surface of the outer skin prior to the integrating step.
(12) The step of integrating is defined by at least a portion of a surface of the gel body that does not contact the inner surface of the cavity by arranging an insert in the urethane-based resin material supplied to the cavity. 12. The manufacturing method according to (10) or 11, which is a step of forming an internal cavity open to the outside of the gel body.

1 illustrates an example of a plastic composite article disclosed herein; FIG. 2 is a view showing each member of the plastic composite product shown in FIG. 1; FIG. FIG. 2 is a diagram showing an example of a state in which an external force is applied to the plastic composite product shown in FIG. 1; 1. It is a figure which shows another example of the state which applied external force to the plastic composite product shown in FIG.

The present disclosure relates to plastic composite products and methods of making same. The composite product disclosed in the present specification is impact resistant both as a product related to intention display and as other products by integrally molding a combination of an inner member having intended viscoelasticity and an outer skin member having suitable surface properties. , viscoelastic and surface properties. Such a composite product can provide unprecedented operability and feel as a product related to intention expression, and can exhibit impact resistance, viscoelasticity, and surface properties all at once as other products. In addition, since the composite product is configured such that the gel body deforms with the application of external force to the outer skin, it is possible to apply this deformation to the process of expressing intention or to hold and protect at least a part of the animal individual. can be applied to Furthermore, in this composite product, the gel body is integrally covered with the skin, so that the viscoelasticity of the gel body can be set with a high degree of freedom. Hereinafter, the disclosure of the present specification will be described with reference to the drawings as appropriate.

In this specification, "products related to expression of intention" include furniture, housing equipment, medical equipment, nursing care equipment, robots, toys, personal computer peripherals, stationery, office supplies, daily necessities, electrical appliances, transportation vehicles such as vehicles contact members such as buttons, switches, keys, levers, and handles (excluding contact members in amusement machines, which will be described later) in interior equipment, etc.;

Other products related to intention expression include touched members such as buttons, switches, keys, levers and handles in amusement machines such as pachinko machines and game machines.

In this specification, "other products" include furniture, housing equipment, medical equipment, nursing care equipment, robots, toys, computer peripherals, stationery, office supplies, daily necessities, and electrical appliances that are not related to the above-mentioned declaration of intention. , contact members in the interior equipment of transportation bodies such as vehicles.

(Plastic composite products)
As illustrated in FIGS. 1 and 2, the plastic composite product (hereinafter also referred to as the composite product) 2 disclosed in this specification is a urethane-based molded body having a predetermined three-dimensional shape and viscoelasticity. and an outer cover 40 which is a soft acrylic molding and has a cavity 60 opened to accommodate at least a portion of the gel body 10 . In the composite product 2, the outer skin 40 constitutes a contact site that is contacted by at least part of an individual animal such as a human.

(gel body)
In this composite product 2, for example, as shown in FIGS. 1 and 2, the gel body 10 has a predetermined three-dimensional shape. Such a three-dimensional shape is not limited, but products related to manifestation of intention and other products can be provided with a three-dimensional shape according to the application. For example, switches, buttons, etc. can have the known shapes of such members, such as cuboids, cubes, hemispheres, and the like. The three-dimensional shape of gel body 10 can be similar to the three-dimensional shape of the present composite product or can constitute a major part of the present composite product.

The gel body 10 can have a desired viscoelasticity. The viscoelasticity of the gel body 10 can be appropriately set according to the application in products related to declaration of intention and other products. For example, the viscoelasticity can be adjusted so as to exhibit characteristics that are generally regarded as low resilience.

The gel body 10 is a urethane-based molding, and is a cured product obtained by curing a urethane-based resin material. The gel body 10, which is a urethane-based molded body, usually exhibits stickiness on the surface, and it is possible to exhibit intended viscoelastic properties such as low resilience and high resilience by selecting the composition and the like. can. The urethane-based resin material as the raw material of the gel body 10 will be described below.

(urethane resin material)
The urethane-based resin material is not particularly limited, and a material prepared so as to obtain the gel body 10 can be used. Urethane-based resin materials include, for example, ether-based urethane resin materials obtained by mixing polyols, polyisocyanates, and catalysts. Such a urethane-based resin material can contain a plasticizer.

(polyol)
The polyol is a compound having two or more hydroxyl groups in one molecule, and is not particularly limited as long as it is used in the production of ordinary urethane-based resins. Examples thereof include polyester polyols and polyether polyols, and polyether polyols can be preferably used. The use of polyether polyol facilitates obtaining suitable viscoelasticity.

Polyester polyols include those obtained by a condensation reaction between a polyhydric alcohol and a polycarboxylic acid. Examples of polyhydric alcohols include ethylene glycol, propylene glycol, butanediol, butylene glycol, glycerin, trimethylolpropane and the like, and these can be used singly or in combination of two or more. Examples of polyvalent carboxylic acids include glutaric acid, adipic acid, maleic acid, terephthalic acid, isophthalic acid, and the like, and these can be used singly or in combination of two or more. Further examples include polyester polyols obtained by ring-opening condensation of caprolactone, methylvalerolactone and the like.

Examples of polyether polyols include polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol, glycerin, trimethylolpropane and sorbitol, and those obtained by addition polymerization of oxides such as ethylene oxide, propylene oxide and trimethylene oxide. These can be used singly or in combination of two or more.

The weight-average molecular weight, the number of functional groups and the hydroxyl value of the polyol are not particularly limited as long as they are values that enable production of a good urethane-based resin. For example, the weight average molecular weight is preferably 3,000 to 7,000, the number of functional groups is preferably 2 to 4, and the hydroxyl value is preferably 27 to 56.

(polyisocyanate)
Polyisocyanate is a compound having two or more isocyanate groups in one molecule, and is not particularly limited as long as it is used in the production of ordinary urethane-based resins. Examples thereof include aromatic isocyanates, aliphatic isocyanates, alicyclic isocyanates, and the like, and aliphatic isocyanates can be preferably used.

Examples of aromatic isocyanates include tolylene diisocyanate (TDI), 4,4-diphenylmethane diisocyanate (MDI), polymeric MDI (crude MDI), xylylene diisocyanate, 1,5-naphthalene diisocyanate and the like. Examples of aliphatic isocyanates include hexamethylene diisocyanate (HDI), isopropylene diisocyanate, and methylene diisocyanate. Alicyclic isocyanates include, for example, cyclohexane-1,4-diisocyanate, isophorone diisocyanate, hydrogenated MDI and the like. Preferably, hexamethylene diisocyanate (HDI) can be used. It is possible to use one or a combination of two or more of these various polyisocyanates. Isocyanate prepolymers obtained from these polyisocyanates can also be used.

The ratio of the amount of polyol and polyisocyanate blended in the urethane-based resin material can be indicated by the so-called isocyanate index, which is the percentage of the equivalent ratio of the isocyanate group concentration in the polyisocyanate to the total active hydrogen group concentration in the polyol. The isocyanate index of the urethane-based resin material is not particularly limited, and can be selected according to the purpose.

For example, if the isocyanate index of the urethane-based resin material for molding urethane gel is too low, the gel cannot be molded, and if it is too high, good stress dispersibility cannot be obtained. preferably. Furthermore, it is preferable to make it 70 or more and 75 or less.

Further, for example, when using Hicast 3423 manufactured by H&K Co., Ltd., 5 to 30 parts of B agent mainly composed of polyisocyanate is added to 100 parts by mass of A agent mainly composed of polyol. It can be 1 part by mass, more preferably 5 to 25 parts by mass. The polyol and the polyisocyanate are preferably used at a ratio of their compounding amounts or a ratio of their compounding amounts that provide an isocyanate index comparable to these.

(catalyst)
The catalyst is not particularly limited as long as it is used in the production of ordinary urethane-based resins. For example, amine-based catalysts, organic metal-based catalysts, and the like can be mentioned. Examples of amine-based catalysts include triethylenediamine, diethanolamine, dimethylaminomonopholine, N-ethylmorpholine and the like. Examples of organometallic catalysts include sternas octoate, dibutyltin dilaurate, lead octenoate, potassium octylate and the like. It is possible to use one or a combination of two or more of these various catalysts. The amount of the catalyst compounded is preferably 0.05 to 3 parts by mass, for example, when the total amount of polyol in the urethane-based resin material is 100 parts by mass.

(Plasticizer)
The plasticizer is not particularly limited as long as it is commonly used as a material for urethane gel. Examples thereof include phthalate, adipate, trimellitate, and phosphate. The blending amount of the plasticizer is preferably 50 to 200 parts by mass, for example, when the total amount of polyols in the urethane gel material is 100 parts by mass.

Other components can be added to the urethane-based resin material, and can be appropriately selected depending on the purpose. Other components include, for example, colorants, antioxidants, ultraviolet absorbers, chain extenders, fillers, and the like.

The method for preparing the urethane-based resin material is not particularly limited as long as it is used for the production of ordinary urethane-based resin materials. For example, it is possible to use various methods such as the so-called one-shot method, which is a method of mixing materials at once, and the so-called prepolymer method, which is a method of using an isocyanate prepolymer obtained from polyisocyanate. The manufacture of the gel body, which is a urethane-based molding, will be described later.

(husk)
As illustrated in FIG. 1, in the composite product 2, the skin 40 has a predetermined three-dimensional shape. Such a three-dimensional shape is not limited, but products related to manifestation of intention and other products can be provided with a three-dimensional shape according to the application. For example, switches, buttons, etc. may be provided with the known shapes of such members as previously described. The three-dimensional shape of skin 40 can be similar to the three-dimensional shape of the composite product or can form a major part of the composite product. The skin 40 can also comprise a cavity 60 that is open to accommodate at least a portion of the gel body 10 . That is, the outer skin 40 can have a shell-like shape surrounding at least a portion of the gel body 10 . Therefore, the shape of the outer skin 40 may depend on the shape of the gel body 10 and the shape of the portion to be accommodated.

The outer skin 40 is a molded body (soft acrylic molded body) made of a soft acrylic resin material. In addition to the characteristic impact resistance and flexibility of the soft acrylic molded body, it protects the gel body 10 and follows well while exhibiting transparency (translucency), etc., and is suitable for viscoelasticity and impact resistance as a whole. surface properties can be exhibited. The surface of the outer skin 40 made of a soft acrylic resin material can exhibit suitable surface properties by molding or painting so as to obtain suitable smoothness, abrasion resistance, and tactile feel. The soft acrylic resin material forming the outer cover 40 will be described below.

(Soft acrylic resin material)
A soft acrylic resin material (hereinafter also simply referred to as an acrylic resin material) is a transparent and flexible resin material obtained by gelling a composition essentially containing an acrylic resin.

The acrylic resin in the acrylic resin material is not particularly limited, but for example, it is possible to use those polymerized with (meth)acrylic acid esters as main constituent monomers, homopolymers thereof, and Copolymers of these with copolymerizable monomers are exemplified, and one or more selected from these homopolymers and copolymers can be used in combination. As (meth)acrylic acid esters, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl methacrylate and the like are preferably used. Monomers copolymerizable with (meth)acrylic acid esters are not particularly limited, but examples include (meth)acrylic acid, unsaturated carboxylic acids such as maleic acid and their esters, vinyl acetate, vinyl propionate vinyl esters, vinyl sulfonate, sulfonic acid monomers such as acrylamide t-butylsulfonic acid, vinyl cyanides such as (meth)acrylonitrile, vinyl ethers such as methyl vinyl ether, (meth)acrylamide, N-methylol (meth ) Unsaturated amides such as acrylamide, α-olefins such as ethylene and propylene, halogen-containing α, β-unsaturated monomers such as vinyl chloride, vinyl fluoride, vinylidene fluoride, glycidyl (meth)acrylate, ethacryl Glycidyl esters such as glycidyl acid, glycidyl ethers such as allyl glycidyl ether, perfluoroalkyl (meth)acrylates, hydroxyalkyl (meth)acrylates such as hydroxyethyl (meth)acrylate, polysiloxane group-containing (meth)acrylates It can be used by appropriately selecting from such as. Here, when only a copolymer resin is used as the acrylic resin, or when a homopolymer and a copolymer of (meth)acrylic acid esters are used in combination, among the monomers constituting the acrylic resin , The (meth)acrylic acid ester monomer is preferably 50 mol% or more, more preferably 60 mol% or more, still more preferably 70 mol% or more, still more preferably 80 mol% or more, and 90 mol % or more, even more preferably 99 mol % or more, and may be 100 mol %.

As the acrylic resin, an ABA type or AB type block copolymer having polymethyl methacrylate (PMMA) as the A block and poly n-butyl acrylate (PnBA) as the B block can be used. can. Such copolymers can be synthesized by a living anionic polymerization method. As the acrylic resin, such block copolymers can be used singly or in combination of two or more so as to exhibit suitable viscoelasticity. Examples of such block copolymers include acrylic resins such as LA2330, LA2250, LA2270, LA2140, and LA1892 (all manufactured by Kuraray Co., Ltd.). Among them, LA2250 and LA2140 can be mentioned, and these are LA2250: LA2140, for example, 90 parts by weight to 60 parts by weight: 10 parts by weight to 40 parts by weight, and for example, 80 parts by weight to 60 parts by weight: 20 parts by weight parts to 40 parts by mass, or for example, 75 to 65 parts by mass: 25 to 35 parts by mass, or for example, 70 parts by mass: 30 parts by mass.

The acrylic resin material can be in the form of particulate powder, pellets, or the like.

The acrylic resin material can contain thermoplastic resins other than the acrylic resins described above, if necessary. There are no particular limitations as long as the resin is compatible with acrylic resins. Examples include polyvinyl chloride resin, polyvinylidene chloride resin, polyvinyl chloride copolymer resin, polyvinylidene chloride copolymer resin, polyurethane resin, and polyurethane. Examples include system copolymer resins, etc., and one or more of these thermoplastic resins can be selected and used.

The acrylic resin material can contain a flame retardant as needed. The flame retardant is not particularly limited, but a phosphate ester flame retardant can be used. Such flame retardants include non-halogen phosphate esters such as tricresyl phosphate, triphenyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, dicresylphenyl phosphate, tripropyl phosphate, tributyl phosphate, and tripentyl phosphate. -based flame retardants, non-halogen condensed phosphate flame retardants such as aromatic condensed phosphates, halogen-containing phosphate esters such as trischloroethyl phosphate and tris(1,3-dichloro-2-propyl) phosphate A flame retardant etc. are mentioned. Among them, non-halogen condensed phosphate flame retardants can be preferably used. For example, non-halogen condensed phosphate flame retardants include PX-200 manufactured by Daihachi Chemical Co., Ltd. This is because such a flame retardant has good compatibility with the above-described PMMA-PnBA-PMMA-PMMA type block copolymer and PMMA-PnBA type block copolymer, and can exhibit intended flame retardancy. Such a flame retardant can be contained, for example, 1 part by mass or more and 10 parts by mass or less, or for example, 3 parts by mass or more and 8 parts by mass or less, or for example, 4 parts by mass, with respect to 100 parts by mass of the acrylic resin described above. parts or more and 6 parts by mass or less. A person skilled in the art can appropriately set the content of the flame retardant according to the acrylic resin to be used, the intended flame retardancy, and the like.

The acrylic resin material can further contain a plasticizer. The plasticizer is not particularly limited as long as it is compatible with acrylic resins. One of conventionally known plasticizers such as acid ester plasticizers, citric ester plasticizers, epoxy plasticizers, adipate plasticizers, trimellitic ester plasticizers, and chlorinated paraffin plasticizers, or Two or more kinds can be selected and used. When the soft acrylic resin layer contains a plasticizer, the amount of the plasticizer is 3 to 40% by mass based on the total amount of the phosphate ester compound and the plasticizer (when multiple types of plasticizers are included, they are combined). is preferably If the amount of the plasticizer is less than 3% by mass, the effect of addition may hardly be obtained, and if it exceeds 40% by mass, the gel body 10 may deteriorate.

The acrylic resin material also contains additives such as adhesives, colorants, ultraviolet absorbers, antioxidants, stabilizers, antibacterial agents, antifungal agents, and antistatic agents, as long as they do not interfere with the purpose of the present invention. It's okay.

(Composite form of gel body and skin)
As illustrated in FIGS. 1 and 2 , in the composite product 2 , the gel body 10 is provided to fill at least a portion of the cavity 60 of the outer skin 40 . How much of the cavity 60 is filled with the gel body 10 is appropriately determined according to the application, function, etc. of the composite product 2 . It is sufficient that the skin 40 covers the gel body 10 and ensures the overall viscoelasticity, impact resistance and surface properties.

The gel body 10 has a first surface 12 that abuts the inner surface of the cavity 60 of the outer skin 40 . The first surface 12 is compounded (integrated) with the inner surface due to the adhesiveness of the gel body 10 . Such a composite form is preferably obtained by filling the cavity 60 of the molded outer skin 40 with a urethane-based resin material and curing the material, as will be described later. The cured gel body 10 is integrated with the inner surface of the cavity 60 of the outer skin 40 as it cures.

It has a second surface 14 that does not contact the inner surface of the cavity 60 of the outer skin 40 of the gel body 10 . The second surface 14 may be, for example, an end surface (bottom surface) of the peripheral portion bordering the open portion of the open internal cavity 20 of the gel body 10, as illustrated in FIGS. It may be the inner surface of the internal cavity 20 provided in the gel body 10 . Moreover, although not illustrated in FIGS. 1 and 2, it may be the outer surface of the gel body 10 that is not housed in the outer skin 40 .

The second surface 14 may be provided with a urethane-based coating 30 . The second surface 14 has the stickiness that the gel body 10 has, and generally such stickiness itself is preferably avoided when handling the composite product 2 . The urethane-based film 30 has good adhesion and coverage with the gel body 10 . The urethane-based film 30 is not particularly limited as long as it can cover the second surface 14 of the gel body 10, but is preferably made of only a urethane-based resin material. For example, it is preferable to use a urethane-based resin material constituting the gel body 10 or a similar material. For example, when the urethane-based resin material forming the gel body is an ether-based urethane resin, it is preferable that the urethane-based film is also made of an ether-based urethane resin material. Various types of coating agents that can form such a urethane-based film 30 are on the market. For example, as a coating agent for ether-based urethane resin materials, Hi-Mex 6504 manufactured by H&K Co., Ltd. can be used. can be done.

Since the composite product 2 is a composite having such a composite form of the gel body 10 and the outer skin 40, it has viscoelasticity, impact resistance and excellent surface properties. It is possible to provide a product configured such that the gel body 10 is deformed together with the outer skin 40 when an external force is applied by the. Such composite products are useful both as manifestation related products and other products. In products related to intention expression, the deformation of the gel body 10 due to such an external force can function, for example, as an intention expression operation. In other products, the deformation of the gel body 10 can hold or protect a part of the individual animal, or provide a suitable repulsive feeling.

For example, the composite product 2 exemplified in FIGS. 1 and 2 has a substantially cubic shape or the like, and is formed to have a three-dimensional shape that can be grasped by human fingers. For this reason, the composite product 2 may be applied with an external force downward from the top, may be gripped from the top with fingers, or may be gripped from the side with fingers. The body 10 deforms in a plane direction that is not constrained by the skin 40 . Therefore, by arranging a member that is pressed by the deformation of the gel body 10 in the predicted deformation direction, it is possible to construct a product related to expression of intention that is omnidirectional and whose operation operation is not limited.

Also, for example, by utilizing the characteristics of urethane resin such as elasticity, softness, cushioning, and impact absorption, it can be used for applications such as anti-vibration/seismic isolation members, impact absorption members, cushion members, sound absorption/sound insulation members, etc. can be done.

(Various aspects of the composite product)
The composite product 2 can take various forms. For example, as illustrated in FIG. 1, an internal cavity 20 defined by at least a portion of the second surface 14 of the gel body 10 and open outwardly of the gel body 10 may be provided. By providing the internal cavity 20, it is possible to accommodate or integrate members according to the intended use and function in the cavity 20, and to control the viscoelasticity, tactile sensation, deflection amount, etc. of the composite product 2. can be adjusted. The shape and size of the internal cavity 20 are appropriately determined according to the function intended to be imparted to the composite product 2 by the internal cavity 20 .

For example, as illustrated in FIGS. 1 and 2, the internal cavity 20 can include an elastic member 50 that deforms as the gel body 10 deforms. By providing the elastic member 50, the viscoelasticity exhibited by the composite product 2 can be adjusted. Moreover, by providing the elastic member 50, the member 50 can be used as a switching member that enables electrical contact. For example, according to the composite product 2 exemplified in FIGS. 1 and 2, as shown in FIGS. Since the elastic member 50 can be reliably pulled downward, the elastic member 50 can effectively function as a switching member or the like. The shape, size, elasticity, etc. of the elastic member 50 are not particularly limited, but are appropriately determined based on the shape and size of the internal cavity 20 and the function desired to be imparted to the composite product 2 by the elastic member 50 .

The elastic member 50 may be an elastically deformable plastic molding. Such plastic moldings may be foams. A molded body such as a foam can receive various deformations of the gel body 10 and deform to function as an effective switching member.

It should be noted that the internal cavity 20 may be provided with a member that displaces along with the deformation of the gel body 10 instead of the elastic member 50 . Even with such a member, it is possible to configure products related to expression of intention using the displacement thereof. The internal cavity 20 can also be provided with other elements depending on the function intended to be imparted to the composite product 2 .

In addition, the composite product 2 may be configured such that the skin 40 is translucent. Acrylic resin materials can exhibit translucency at various levels. When the outer skin 40 has translucency, the inner surface of the outer skin 40 can be provided with a printed layer containing visible elements. By doing so, it is possible to provide the present composite product 2 capable of displaying and decorating as required. Moreover, since the printed layer is protected by the outer skin 40, its displayability and decorativeness are maintained.

In addition, the composite product 2 may be configured such that the gel body 10 and the skin 40 are translucent. It is easy to make the gel body 10 translucent by adjusting the composition of the urethane-based resin material. By doing so, it is possible to provide a composite product further equipped with an unprecedented appearance. Moreover, by providing a light irradiation device that transmits light through at least a part of the second surface 14 of the gel body 10, the present composite product 2 capable of display and decoration by light transmission can be provided. The light irradiation device has a known light source and the like, and is arranged in an arbitrary pattern. The light irradiation device may be arranged on the surface corresponding to the lower surface of the second surface 14 of the gel body 10, or arranged on the surface corresponding to the inner surface of the internal cavity 20, in the form illustrated in FIG. may be

In addition, in the composite product 2, the size of the skin 40 is such that it surrounds the entire gel body 10, and a bracket portion 70 for attachment to another member can be provided on the periphery of the open side of the skin 40. In addition, in the composite product 2, the outer skin 40 is sufficiently large relative to the gel body 10, so that a light irradiation device or the like can be arranged in the outer skin 40, such as below the gel body 10 where the gel body 10 is not filled. A gel external cavity 80 may be configured.

In addition, the composite product 2 can take various forms. The form illustrated in FIG. 1 and the like is composed of the gel body 10 filled in the hemispherical cavity 60 in the outer skin 40 having a cubic outer shape, but is not limited to this, and has a cylindrical outer shape. It may be composed of a gel body 10 that fills a cylindrical cavity 60 in the outer skin 40 .

In addition, in the embodiment illustrated in FIG. 1 and the like, the skin 40 is configured to exceed the size of the gel body 10, but the configuration is not limited to this. A configuration in which the gel body 10 exceeds the size of the outer skin 40 is not excluded.

(Manufacturing method of the composite product)
The manufacturing method of the present composite product comprises supplying a urethane-based resin material to the cavity of the outer skin, which is a soft acrylic molding and has an open cavity, and hardening the urethane-based resin material. a step of integrating a urethane-based resin gel body so as to fill at least a portion of the cavity of the outer skin; a step of forming a urethane-based coating on a surface of the gel body that does not contact the inner surface of the cavity; can be provided. According to this production method, the composite product can be produced with good integration of the skin and the gel body.

The manufacturing method can take various forms for manufacturing the composite product already described. For example, when forming a printed layer on the inner surface of the outer skin 40, prior to supplying the urethane-based resin material, a step of applying (printing) one or more visible elements to the inner surface of the outer skin 40 is performed. be prepared. Further, when forming the internal cavity 20 in the gel body 10, the urethane-based resin material supplied to the cavity 60 is cured after the inserts are placed before curing. By doing so, it is possible to form the internal cavity 20 that is defined by at least a part of the surface of the gel body 10 that does not contact the inner surface of the cavity 60 and that is open to the outside of the gel body 10 .

The outer skin 40, which is a soft acrylic molding and has an open cavity 60, can be manufactured by a known method using the acrylic resin material described above.

In the step of curing and integrating the urethane-based resin material, a known resin material molding method can be employed, and for example, injection molding can be used. Although the mold is not particularly limited, for example, a mold such as a metal mold or a resin mold can be used.

The form in which the urethane-based resin material is cured is not particularly limited. For example, curing by heating, photocuring, natural curing, or the like may be used. In the case of using a mold, for example, it may be taken out after the curing reaction is completed in the mold, or it may be taken out from the mold when cured to some extent, and then further cured. Conditions for hardening and gelling the urethane-based resin material can be appropriately set according to the composition and intended viscoelasticity of the urethane-based resin material.

According to this manufacturing method, since the urethane-based resin material before curing is supplied to the cavity 60 of the outer skin 40, the urethane-based resin material is cured while being integrated with the inner surface of the cavity 60 of the outer skin 40. . That is, the first surface 12 of the gel body 10 hardens in a state of being in close contact or integrated with the inner surface of the cavity 60 . Although they are different materials, they can be tightly adhered to each other due to the adhesiveness of the gel body 10, and the skin 40 suppresses the adhesiveness of the gel body 10 and imparts good surface characteristics.

In the step of forming the urethane-based coating on the surface (second surface 14) of the gel body 10 that does not come into contact with the inner surface of the internal cavity 20, the coating agent for forming the urethane-based coating described above is supplied. Forms a urethane coating. By doing so, the adhesiveness of the gel body 10 can be suppressed, and suitable surface properties can be exhibited also on the second surface 14 .

EXAMPLES The present invention will be specifically described below with reference to examples, but these are not intended to limit the present invention.
A skin-like molding made of soft acrylic resin having the shape shown in FIGS. 1 and 2 was manufactured. This skin-like molded body has a size approximately like a fist of a human hand and has a cubic outer shape. This molded product is obtained by mixing acrylic resins LA2250 and LA2140 manufactured by Kuraray Co., Ltd. at a ratio of 70 parts by mass: 30 parts by mass, and further adding aromatic resin manufactured by Daihachi Chemical Co., Ltd. to 100 parts by mass of the mixture. This is a molded article of an acrylic resin material composition containing 5 parts by mass of PX-200, which is a condensed phosphate flame retardant. The molded article was manufactured by a known method using a soft acrylic resin material composition.

A soft acrylic resin molded body is placed in a mold having a cavity that matches the outer shape of the molded body, and Hicast W3423A manufactured by H&K Co., Ltd. as liquid A and Hicast W3423B as liquid B. and were mixed at a mass ratio of 100:15.2, and the undiluted solution was injected into the cavity of the outer skin-like molding up to about the 8th minute. After that, it was placed in a stock solution filled with a nest for forming a hemispherical internal cavity in the gel body shown in FIGS. 1 and 2, the mold was closed, and then cured at about 50° C. for about 60 minutes.

After that, a coating solution was prepared by diluting Hymex 6504 WHITE manufactured by Etch & K Co., Ltd. as a urethane coating material with the same amount of water, and using this coating solution with a spray gun, the nest was removed. It was evenly applied to the exposed surface of the gel body and dried at room temperature for 2 hours.

After drying, an adhesive was applied to the inner part of the internal cavity, and a sponge body having a shape roughly following the shape of the internal cavity was adhered as an elastic member to obtain the composite product shown in FIGS.

The resulting composite product was a translucent, substantially cubic body having optical transparency as a whole, and contained a low-resilience gel body inside the cavity of the cubic portion of the outer skin, as shown in FIGS. By pressing the outer skin as shown in Fig. 4, it was deformed with good integrity and intentionally exhibited low resilience. Moreover, the sponge body provided inside was deformed or displaced as the outer skin pressed and was pushed downward from the inner cavity.

In addition, the resulting composite product had sufficient impact resistance to withstand being hit by a hand or the like, and had a suitable tactile feel.

2 composite product 10 gel body 12 first surface 14 second surface 20 internal cavity 30 urethane coating 40 outer skin 50 elastic member 60 cavity 70 bracket part 80 gel external cavity

Claims (11)

a gel body that is a urethane-based molded body having viscoelasticity;
A soft acrylic molded body having a predetermined three-dimensional shape, the skin having a cavity accommodating at least a portion of the gel body;
with
The skin is an ABA type block copolymer or an AB type block copolymer having polymethyl methacrylate (PMMA) as the A block and poly n-butyl acrylate (PnBA) as the B block, A non-halogen condensed phosphate flame retardant and a flame-retardant outer skin containing,
The gel body abuts on the inner surface of the cavity by contacting the inner surface of the cavity due to the adhesiveness provided on the outer surface of the gel body, and the first surface of the outer skin that is integrated with the cavity, and the inner surface of the cavity. and a second surface provided with an ether-based urethane resin coating , the plastic composite product deforming toward the second surface when an external force is applied to the outer skin. 2. The plastic composite article of claim 1, wherein said gel body has an internal cavity defined by at least a portion of said second surface. 3. The plastic composite product according to claim 2 , wherein the internal cavity comprises an elastic member that deforms with deformation of the gel body or a member that displaces with deformation of the gel body. The plastic composite product according to any one of claims 1 to 3, wherein said skin is translucent and has one or more visible elements on said inner surface. The plastic composite product according to any one of claims 1 to 4 , wherein said urethane-based molded product is an ether-based urethane resin molded product. 6. The gel body and the skin according to any one of claims 1 to 5 , wherein the gel body and the skin are provided with a light irradiation device that has translucency and transmits light through at least a part of the second surface of the gel body. A plastic composite product as described. 7. The plastic composite product of claim 6 , wherein inside the skin and below the gel body, there is another cavity for placing the light irradiation device. The outer skin has an outer shape that allows the operator to apply the external force to express his/her intention,
8. The plastic composite product according to any one of claims 1 to 7 , wherein the plastic composite product is an intention manifestation-related product that applies deformation of the gel body due to the external force to a process for the intention manifestation of the operator. The plastic composite product according to any one of claims 1 to 7 , which is a vibration/seismic isolation member, shock absorption member, cushion member, sound absorption/sound insulation member. A method for manufacturing a plastic composite product, comprising:
A step of molding a molding having a predetermined three-dimensional shape with a concavely opened cavity using a soft acrylic resin material to obtain an outer skin;
A step of supplying a urethane-based resin material to the cavity of the outer skin, curing the urethane-based resin material, and integrating a urethane-based resin gel body so as to fill at least a part of the cavity of the outer skin. and,
with
The soft acrylic resin material is an ABA type block copolymer or an AB type block copolymer having polymethyl methacrylate (PMMA) as the A block and poly n-butyl acrylate (PnBA) as the B block. Containing a polymer and a non-halogen condensed phosphate ester flame retardant,
The composite product includes a first surface that is integrated with the cavity of the outer skin by contacting the inner surface of the cavity due to the adhesiveness that the gel body has on the outer surface of the gel body, and the inner surface of the cavity. and a second surface having an ether-based urethane resin coating, which surface does not come into contact with the surface, and the gel body deforms toward the second surface as an external force is applied to the outer skin. ,Production method. 11. The method of manufacturing of claim 10 , wherein said skin is translucent and comprising imparting one or more visible elements to said inner surface of said skin prior to said integrating.

Images