Skin material and cylindrical body using the skin material

Abstract

To provide a skin material capable of preventing occurrence of a defect such as tearing even when the skin material is thin, in a method of laminating a skin material on a surface of a resin foam using profile extrusion molding.SOLUTION: There is provided a skin material that is adhered to a surface of a resin foam, wherein the skin material is an extrusion molded body containing a resin composition having adhesiveness to the resin foam, the resin composition has a take-off speed of 9.0 m / min or more at 115°C, and the extrusion molded body has a dynamic friction coefficient of 0.50 or less in accordance with JIS K7125.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present technology relates to a skin material. More specifically, the present technology relates to a skin material that is bonded to a surface of a resin foam, and a cylindrical body using the skin material. [Background technology]

[0002] Insulating and heat-insulating cylinders are used in water supply piping, fire-resistant water piping, etc. to prevent freezing and burns, and resin foam is generally used for these insulating and heat-insulating cylinders because of their heat insulation, shock-absorbing properties, and ease of molding. A protective skin is provided on the surface of the insulating and heat-insulating cylinder made of resin foam to prevent scratches, detachment, etc. For example, Patent Document 1 discloses an insulating cylinder in which a skin made of a flame-retardant film is provided on the surface of a two-layer cylindrical foam.

[0003] As a method for laminating a skin material onto a resin foam, for example, there is a method in which a sheet-shaped skin material is adhered to the surface of the resin foam in a post-process.For example, Patent Document 2 discloses a technique for manufacturing a pipe cover by cutting a cylindrical body made of a polyolefin foam in one direction of the circumferential surface to reach both end faces in the longitudinal direction, and adhering a sheet made of a polyolefin foam to the outer surface of one side of the cylindrical body with the cut part as a boundary so as to cover the cut part.

[0004] Another lamination method is a method of laminating a skin material on the surface of a resin foam by profile extrusion molding. For example, Patent Document 3 discloses a technique of manufacturing a coated pipe by extruding a molten foamable resin from an extruder onto the outer surface of a pipe, foaming the foamable resin while contacting the inner surface of the die to form a foam layer (heat-retaining tube), and then extruding a resin layer (skin material) onto the outer peripheral surface of the foam layer.

[0005] Patent Document 4 also discloses a technology for producing a composite pipe having a surface protection layer that is resistant to tearing, by extruding a cross-linked polyethylene pipe that will become the pipe body from a first extruder, then extruding a foamed resin layer made of a polyethylene foam from a second extruder, and further extruding a surface protection layer composition mainly composed of a thermoplastic resin elastomer onto the foamed resin layer from a third extruder to obtain an intermediate molded product, and then passing the intermediate molded product continuously through an embossing die. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 6-59697 [Patent Document 2] Japanese Patent Application Publication No. 9-152090 [Patent Document 3] JP 2002-156074 A [Patent Document 4] JP 2015-10626 A Summary of the Invention [Problem to be solved by the invention]

[0007] As mentioned above, various techniques have been proposed as a method for laminating a skin material to a resin foam. In the method of adhering a sheet-like skin material in a later process, the thickness of the skin is almost constant and it is unlikely to break, but there are many steps and there is a concern that the tape may peel off, and in order to prevent peeling, the thickness of the tape and the heat-retaining tube must be increased, which leads to high costs. In contrast, in the method of laminating a skin material on the surface of a resin foam by profile extrusion molding, a molten skin is directly laminated on the resin foam, so it is less expensive and the number of work steps can be reduced compared to the method of adhering a skin material. However, depending on the shape of the resin foam to be bonded, the thickness may become thin depending on the surface shape of the resin foam, which may cause tears. By making the thickness of the skin material thicker overall, tears and the like can be prevented, but the amount of material used increases, which increases the amount of waste when it is discarded, which is not only contrary to the current times but also leads to increased costs.

[0008] Therefore, the main objective of this technology is to provide a technology that can prevent defects such as tearing even when using a thin skin material in a method of laminating a skin material on the surface of a resin foam by profile extrusion molding. [Means for solving the problem]

[0009] The present inventors conducted intensive research to solve the above-mentioned problems, and as a result, they succeeded in preventing the occurrence of defects such as tearing even when the skin material is molded thin by producing a skin material having a specific dynamic friction coefficient using a resin composition having a specific take-off speed, thereby completing the present technology.

[0010] That is, in the present technology, first, a skin material to be adhered to a surface of a resin foam, an extrusion molded article comprising a resin composition having adhesiveness to the resin foam, The resin composition has a take-off speed of 9.0 m / min or more at 115° C., The extrusion molded article provides a skin material having a dynamic friction coefficient of 0.50 or less in accordance with JIS K7125. The skin material according to the present technology can have a thickness of 0.6 mm or less.

[0011] In this technology, next, a cylindrical resin foam and a skin material bonded to an outer periphery of the cylindrical resin foam, The present invention provides a cylindrical body, wherein the skin material is the skin material according to the present technology. In the tubular body according to the present technology, the peel strength between the tubular resin foam and the skin material can be 1.5 N or more. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A preferred embodiment for carrying out the present technology will be described below. The embodiments described below are examples of typical embodiments of the present technology, and any of the embodiments can be combined. In addition, the scope of the present technology is not narrowly interpreted by these.

[0013] 1.Skin material The skin material according to the present technology is a skin material that is bonded to the surface of a resin foam. The skin material according to the present technology is disposed on the outermost surface of the essential structure of the molded body using the resin foam to which the skin material according to the present technology is bonded, and therefore the term "skin" is used for convenience, but in an actual product, it is not limited to being disposed on the outermost surface. For example, it is also possible to further laminate a desired material on the surface of the skin material, to cover the skin material with a desired material, or to cover the entire molded body with a desired material.

[0014] The shape of the resin foam to be bonded is not limited as long as it does not impair the action and effect of the present technology. For example, a cylindrical resin foam to be described later can be used as the bonded object, but resin foams of various shapes according to the purpose and use can be used as the bonded object of the skin material of the present technology. The details of the resin foam to be bonded to the skin material of the present technology are the same as the cylindrical resin foam to be described later except for the shape, so the details will be described later.

[0015] The skin material according to the present technology is an extrusion molded article containing a resin composition that is adhesive to the resin foam to be adhered. The extrusion molding method will be described later.

[0016] The resin composition used in the skin material according to the present technology contains a resin component and, if necessary, a pigment, etc. In addition, various other components that can be used in the production of the skin material depending on the purpose and application can be contained. Each component will be described in detail below.

[0017] (1) Resin component As the resin component that can be used in the present technology, one or more general resins that can be used for skin materials can be freely selected and used within the scope that does not impair the purpose and effect of the present technology. For example, thermoplastic resins such as polyolefin resins, polystyrene resins, polyamide resins, and polyester resins; thermoplastic elastomers such as olefin thermoplastic elastomers and styrene thermoplastic elastomers; synthetic rubbers such as ethylene propylene rubber (EPDM), and thermosetting elastomers such as natural rubber can be mentioned. Among these, in the present technology, it is preferable to use polyolefin resins and olefin thermoplastic elastomers.

[0018] The polyolefin resin that can be used in the present technology is a resin mainly composed of an olefin component unit. The resin mainly composed of an olefin component unit is a resin containing 50% by mass or more of an olefin component unit. In the present technology, the content of the olefin component unit in the resin is preferably 70% by mass or more, more preferably 80% by mass or more, and even more preferably 90% by mass or more, and it is particularly preferable that the resin component is composed only of a polyolefin resin.

[0019] The olefin-based thermoplastic elastomer that can be used in the present technology is a thermoplastic elastomer that has a polyolefin-based resin as a hard segment and a rubber component as a soft segment.

[0020] Examples of polyolefin-based resins that can be used in the present technology include polyethylene-based resins, polypropylene-based resins, polybutene, polypentene, and copolymers of olefin-based monomers and monomers that can be copolymerized with the olefin-based monomers. These can be used alone or in combination of two or more kinds.

[0021] Examples of polyethylene resins include ethylene homopolymers such as high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and very low density polyethylene (VLDPE); ethylene-propylene random copolymers, ethylene-propylene block copolymers, ethylene-butene block copolymers, ethylene-butene random copolymers, ethylene-vinyl acetate copolymers (EVA), and ethylene-methyl methacrylate copolymers.

[0022] Examples of polypropylene-based resins include propylene homopolymers such as isotactic polypropylene, syndiotactic polypropylene, and atactic polypropylene; propylene-ethylene random copolymers, propylene-ethylene block copolymers, propylene-butene random copolymers, propylene-butene block copolymers, propylene-ethylene-butene terpolymers, propylene-acrylic acid copolymers, and propylene-maleic anhydride copolymers.

[0023] Among these, in the present technology, it is preferable to use polyethylene-based resins such as low-density polyethylene (LDPE) and ethylene-vinyl acetate copolymer (EVA), and olefin-based thermoplastic elastomers.

[0024] In addition, in the present technology, a biomass-derived polyolefin resin can be used as a part or the whole of the polyolefin resin. In the present technology, the biomass-derived polyolefin resin refers to a renewable polyolefin resin made from animals and plants, excluding fossil fuels such as petroleum.

[0025] The biomass-derived polyolefin resin that can be used in the present technology can be one or more biomass-derived polyolefin resins produced using a general method, and can be used in any combination, as long as the action and effect of the present technology are not impaired. As an example of a method for producing a biomass-derived polyolefin resin, for example, a method for polymerizing a hydrocarbon such as ethylene derived from biomass can be used to produce a biomass-derived polyolefin resin. The biomass-derived hydrocarbon can be produced using an alcohol such as ethanol derived from biomass as a raw material. The method for producing the biomass-derived alcohol is not particularly limited, and for example, a biomass-derived alcohol can be produced by contacting an alcohol-producing microorganism or a product derived from its crushed material with a culture solution containing a carbon source obtained from a plant raw material such as corn, sugar cane, beet, or manioc, and then purifying the product.

[0026] As described later, the skin material according to the present technology is characterized by using a resin composition having a take-off speed of 9.0 m / min or more at 115°C. In order to adjust the take-off speed of the resin composition at 115°C to 9.0 m / min or more, two or more different resins can be blended. Specifically, for example, two or more resins having different melting points can be blended. More specifically, for example, a method of blending a resin having a melting point of 95°C or more with a resin having a melting point of less than 95°C, a method of blending a resin having a melting point of 95°C to 110°C with a resin having a melting point lower than the melting point of the resin, a method of blending a resin having a melting point of 100°C or more with a resin having a melting point of less than 95°C, etc. can be mentioned.

[0027] In this way, when a resin with a high melting point is blended with a resin with a lower melting point, the blending ratio can be freely set as long as it does not impair the action and effect of the present technology. For example, the blend can be made at a ratio of 95:5 to 50:50 (resin with a high melting point:resin with a lower melting point).

[0028] The resin used in the present technology may contain a recycled resin that is recycled from waste resins or resin foams described above. In the present technology, the recycled resin is a resin produced from a resin composition that has been degassed and decrosslinked using a general method. That is, in the present technology, the recycled resin is not a resin pulverized product obtained by simply pulverizing a resin or a resin foam, but a resin that has been degassed and decrosslinked by subjecting a used resin or a resin foam to pulverization, shearing, melt kneading, or the like.

[0029] The method for degassing and decrosslinking the used resin or resin foam is not particularly limited as long as it does not impair the effects of the present technology, and any general degassing and decrosslinking method can be freely selected and used.

[0030] (2) Pigments The resin composition for producing the skin material according to the present technology may contain a pigment. As the pigment that can be used in the present technology, one or more general pigments that can be used in skin materials may be freely selected and used as long as the purpose and effect of the present technology are not impaired.

[0031] In the present technology, both inorganic and organic pigments can be used. Examples of inorganic pigments include carbon black, iron oxide, titanium oxide, copper manganese, copper chromium, aluminum oxide, and cobalt. Examples of organic pigments include cyanine pigments, copper phthalocyanine pigments, and aniline pigments. The color of the pigment is not particularly limited, and examples thereof include brown pigments, gray pigments, blue pigments, white pigments, ivory pigments, beige pigments, green pigments, and black pigments.

[0032] The amount of pigment used in the production of the skin material according to the present technology can be freely set as long as it does not impair the purpose and effect of the present technology. In the present technology, the lower limit of the pigment content relative to 100 parts by mass of the resin component in the resin composition is, for example, 0.1 parts by mass or more, preferably 0.5 parts by mass or more, and more preferably 1.0 parts by mass or more. By setting the pigment content in the resin composition within this range, a skin material with a better appearance can be produced.

[0033] In the present technology, the upper limit of the pigment content relative to 100 parts by mass of the resin component in the resin composition is, for example, 10.0 parts by mass or less, preferably 7.0 parts by mass or less, and more preferably 5.0 parts by mass or less. Setting the pigment content in the resin composition within this range can also contribute to cost reduction.

[0034] In the present technology, the pigment can be used as a master batch in which the pigment is dispersed in the above-mentioned resin component. By using the pigment master batch, the dispersibility in the resin component can be improved.

[0035] (3) Other ingredients In the resin composition for producing the skin material according to the present technology, one or more of various components that can be used in the production of skin materials can be freely selected and used as other components depending on the purpose, as long as the purpose and effect of the present technology are not impaired.

[0036] Examples of components that can be used in the resin composition for producing the skin material according to the present technology include inorganic fillers, flame retardants, stabilizers, plasticizers, antioxidants, dispersants, and ultraviolet absorbers.

[0037] (4) Take-off speed at 115°C The resin composition used in the production of the skin material according to the present technology is characterized by having a take-off speed of 9.0 m / min or more at 115° C. By using a resin composition having a take-off speed of 9.0 m / min or more at 115° C., it is possible to prevent defects such as breakage even in a thinly molded skin material, and to improve the feel of the skin material.

[0038] The resin composition used in the production of the skin material according to the present technology can exhibit the effects of the present technology so long as the take-up speed at 115° C. is 9.0 m / min or more, but is preferably 10.0 m / min or more, more preferably 11.0 m / min or more, and even more preferably 12.0 m / min or more. By setting the lower limit of the take-up speed at 115° C. of the resin composition within this range, a thinner but high-quality skin material can be obtained.

[0039] The upper limit of the take-up speed at 115 ° C. of the resin composition used in the production of the skin material according to the present technology can be freely set as long as it does not impair the purpose and effect of the present technology, but is, for example, 30.0 m / min or less, preferably 28.0 m / min or less, more preferably 25.0 m / min or less, and even more preferably 21.0 m / min or less. By setting the upper limit of the take-up speed at 115 ° C. of the resin composition within this range, the productivity during the production of the skin material can be improved and the peel strength between the skin material and the resin foam can be improved. In addition, when the skin material according to the present technology is used on the surface of a cylindrical body described later, the average surface roughness of the cylindrical body can be reduced, and a cylindrical body with a better feel can be obtained.

[0040] In the present technology, the take-up speed of the resin composition at 115° C. is a value measured by the method described in the examples below.

[0041] (5) Coefficient of kinetic friction The extrusion molding that forms the skin material according to the present technology is characterized by having a dynamic friction coefficient of 0.50 or less in accordance with JIS K 7125. By forming the skin material from an extrusion molding with a dynamic friction coefficient of 0.50 or less, it is possible to improve the productivity during the production of the skin material and to improve the peel strength between the skin material and the resin foam.

[0042] The extrusion molding forming the skin material according to the present technology can exhibit the effects of the present technology if the coefficient of dynamic friction is 0.50 or less, but is preferably 0.45 or less, more preferably 0.42 or less, and even more preferably 0.40 or less. By setting the upper limit of the coefficient of dynamic friction of the extrusion molding within this range, the peel strength between the skin material and the resin foam can be further improved.

[0043] The lower limit of the dynamic friction coefficient of the extrusion molded article forming the skin material according to the present technology can be freely set as long as it does not impair the purpose and effect of the present technology, and can be set to, for example, 0.05 or more.

[0044] In the present technology, the dynamic friction coefficient of the extrusion molded body is a value measured in accordance with JIS K7125.

[0045] (6) Thickness The thickness of the skin material used in this technology can be freely designed according to the purpose and use, but one of the features of this technology is that even if it is designed to be 0.6 mm or less in thickness, there is little occurrence of defects such as tearing.

[0046] It is possible to make the skin material using this technology even thinner; for example, even if it is made thinner than 0.5 mm, the effects of this technology can be fully demonstrated. By making the thickness thinner, the amount of material used can be reduced, which reduces costs, simplifies disposal, and also contributes to the environment.

[0047] In the present disclosure, the thickness of the skin material is a value measured by the method described in the examples below.

[0048] 2. Cylindrical body The cylindrical body according to the present technology includes a cylindrical resin foam and a skin material bonded to the outer periphery of the cylindrical resin foam. The cylindrical body according to the present technology will be described in detail below. Note that the skin material used for the cylindrical body according to the present technology is the same as the skin material according to the present technology described above, and therefore the description thereof will be omitted here.

[0049] (1) Cylindrical resin foam The cylindrical resin foam used in the cylindrical body according to the present technology is a foam of a resin composition containing a resin, a foaming agent, and, if necessary, a shrinkage inhibitor, a bubble adjuster, etc. In addition, various components that can be used in the production of a resin foam depending on the purpose can be contained. Each component will be described in detail below.

[0050] (1-1) Resin component As the resin component that can be used for the cylindrical resin foam used in the cylindrical body according to the present technology, one or more general resins that can be used for the resin foam can be freely selected and used within the scope that does not impair the purpose and effect of the present technology. Note that the types of resin components that can be used for the resin foam are the same as the resin components that can be used for the surface material according to the present technology described above, so the explanation is omitted here. Below, the matters specific to the resin components used for the cylindrical resin foam will be explained.

[0051] The resin component used in the cylindrical resin foam used in the cylindrical body according to the present technology preferably has a breaking tension at 115° C. of 0.13 N or more, more preferably 0.15 N or more, even more preferably 0.16 N or more, even more preferably 0.17 or more, and particularly preferably 0.18 N or more. By using a resin having a breaking tension at 115° C. in this range, a foam with a lower density can be produced. That is, by using a resin having a breaking tension at 115° C. in this range, the expansion rate of the foam can be improved.

[0052] Furthermore, the resin component used in the cylindrical resin foam used in the cylindrical body according to the present technology preferably has a breaking tension at 115° C. of 0.30 N or less, more preferably 0.28 N or less, even more preferably 0.27 N or less, even more preferably 0.26 N or less, and particularly preferably 0.25 N or less. By using a resin whose breaking tension at 115° C. is in this range, forming defects due to excessive foaming can be suppressed.

[0053] In this technology, the breaking tension of the resin component at 115°C is a value measured by the method described below. [Breaking tension at 115℃] In this technique, the breaking tension at 115°C is measured using a capillograph. Specifically, the raw resin is discharged from a capillary with a diameter of 1.00 mm and a length of 10.0 mm in a temperature environment set at 115°C at a shear rate of 10 M / min, and the discharged molten resin (strand) is taken up by a take-up roller via a pulley-shaped load cell. The speed of the take-up roller is accelerated, and the breaking tension (N) at the time of the strand breaking is measured.

[0054] (1-2) Foaming agent The resin composition for producing the cylindrical resin foam used in the cylindrical body according to the present technology may contain a foaming agent. As the foaming agent that can be used in the present technology, one or more foaming agents that can be used in the resin foam may be freely selected and used as long as the purpose and effect of the present technology are not impaired.

[0055] In this technology, both physical and chemical foaming agents can be used, but it is preferable to use a physical foaming agent. In chemical foaming, which is foamed by thermal decomposition or reaction of a chemical foaming agent, decomposition residues of the chemical foaming agent may be generated. On the other hand, physical foaming using a physical foaming agent allows continuous production of non-crosslinked resin foam and does not fall off or leave decomposition residues, so it can be suitably used as an insulating material or protective material for metal pipes where corrosion due to residues is a concern.

[0056] Examples of physical foaming agents include inorganic physical foaming agents and organic physical foaming agents, and either of them can be used in the present technology.

[0057] Examples of inorganic physical blowing agents include nitrogen, carbon dioxide, oxygen, air, water, etc. Examples of organic physical blowing agents include aliphatic hydrocarbons such as isobutane, propane, normal butane, normal pentane, isopentane, normal hexane, and isohexane, alicyclic hydrocarbons such as cyclopentane and cyclohexane, chlorinated hydrocarbons such as methyl chloride and ethyl chloride, fluorinated hydrocarbons such as 1,1,1,2-tetrafluoroethane and 1,1-difluoroethane, ethers such as dimethyl ether and methyl ethyl ether, and alcohols such as methanol and ethanol. Among these, isobutane is preferably used in the present technology.

[0058] Examples of chemical foaming agents include organic chemical foaming agents and inorganic chemical foaming agents, and either of them can be used in the present technology.

[0059] Examples of organic chemical foaming agents include azo compounds such as azodicarbonamide (ADCA), metal azodicarboxylates (e.g., barium azodicarboxylate), and azobisisobutyronitrile (AIBN), nitroso compounds such as N,N'-dinitrosopentamethylenetetramine (DPT), hydrazine derivatives such as hydrazodicarbonamide, 4,4'-oxybis(benzenesulfonylhydrazide), and toluenesulfonylhydrazide (TSH), and semicarbazide compounds such as toluenesulfonylsemicarbazide.

[0060] Examples of inorganic chemical foaming agents include ammonium carbonate, sodium carbonate, ammonium hydrogen carbonate, sodium hydrogen carbonate, ammonium nitrite, sodium borohydride, and anhydrous monosodium citrate.

[0061] The amount of foaming agent used in the production of the cylindrical resin foam used in the cylindrical body according to the present technology can be freely set as long as it does not impair the purpose and effect of the present technology. When a physical foaming agent is used, in the present technology, the lower limit of the amount of foaming agent used per 100 parts by mass of the resin component in the resin composition is, for example, 0.05 L / min or more, preferably 0.10 L / min or more, and more preferably 0.15 L / min or more. By setting the content of the foaming agent in the resin composition within this range, the foamability during foam production can be improved, and the physical properties of the foam produced can be improved.

[0062] In the present technology, the upper limit of the amount of foaming agent used per 100 parts by mass of the resin component in the resin composition is, for example, 0.50 L / min or less, preferably 0.40 L / min or less, and more preferably 0.35 L / min or less. By setting the amount of foaming agent used within this range, formation defects due to excessive foaming can be suppressed, and also contribute to cost reduction.

[0063] (1-3) Shrinkage prevention agent The resin composition for producing the cylindrical resin foam used in the cylindrical body according to the present technology may contain a shrinkage inhibitor.

[0064] As the shrinkage prevention agent that can be used in the present technology, one or more shrinkage prevention agents that can be used for resin foams can be freely selected and used, as long as the purpose and effect of the present technology are not impaired.

[0065] Examples of shrinkage inhibitors that can be used in the present technology include ester-based shrinkage inhibitors such as glycerin fatty acid esters such as monolauric acid glyceride, monomyristate acid glyceride, monopalmitic acid glyceride, monostearate acid glyceride, monoarachic acid glyceride, dilauric acid glyceride, dipalmitic acid glyceride, distearate acid glyceride, 1-palmito-2-stearate acid glyceride, 1-stearo-2-myristate acid glyceride, and tristearate acid glyceride; polyoxyalkylene fatty acid esters such as polyoxyethylene monomyristate, polyoxypropylene monomyristate, polyoxyethylene monopalmitate, polyoxypropylene monopalmitate, polyoxyethylene monostearate, polyoxypropylene monostearate, and polyoxyethylene distearate; and amine- and amide-based shrinkage inhibitors such as stearic acid amide, palmitic acid amide, stearic acid diethanolamide, stearic acid monoethanolamide, hydroxyethylamine, and hydroxypropylamine.

[0066] Among these, in the present technology, it is preferable to use an ester-based shrinkage inhibitor, and it is more preferable to use a glycerin fatty acid ester.

[0067] The amount of shrinkage inhibitor used in the production of the cylindrical resin foam used in the cylindrical body according to the present technology can be freely set as long as it does not impair the purpose and effect of the present technology. In the present technology, the lower limit of the content of the shrinkage inhibitor relative to 100 parts by mass of the resin component in the resin composition is, for example, 0.1 parts by mass or more, preferably 0.5 parts by mass or more, and more preferably 1.0 parts by mass or more. By setting the content of the shrinkage inhibitor in the resin composition within this range, the shrinkage of the foam can be more effectively suppressed.

[0068] In the present technology, the upper limit of the content of the shrinkage inhibitor relative to 100 parts by mass of the resin component in the resin composition is, for example, 15.0 parts by mass or less, preferably 10.0 parts by mass or less, and more preferably 5.0 parts by mass or less. By setting the content of the shrinkage inhibitor in the resin composition within this range, it is possible to suppress the exudation of the shrinkage inhibitor to the surface of the foam and also to contribute to cost reduction.

[0069] In the present technology, the shrinkage inhibitor can be used as a masterbatch in which the shrinkage inhibitor is dispersed in the resin component. By using the shrinkage inhibitor masterbatch, the dispersibility in the resin component can be improved.

[0070] (1-4) Foam regulator The resin composition for producing the cylindrical resin foam used in the cylindrical body according to the present technology may contain a cell regulator.

[0071] As the cell regulator that can be used in the present technology, one or more cell regulators that can be used in resin foams can be freely selected and used, as long as they do not impair the purpose and effect of the present technology.

[0072] Examples of the foam regulator that can be used in the present technology include inorganic foam regulators such as talc, zeolite, silica, calcium carbonate, zinc borate, magnesium borate, borax and other metal borates, sodium chloride, aluminum hydroxide, sodium bicarbonate, etc.; and organic foam regulators such as sodium 2,2-methylenebis(4,6-tert-butylphenyl)phosphate, sodium benzoate, calcium benzoate, aluminum benzoate, sodium stearate, etc.

[0073] Among these, in the present technology, it is preferable to use an inorganic cell regulator, and it is more preferable to use talc.

[0074] The amount of the cell regulator used in the manufacture of the cylindrical resin foam used in the cylindrical body according to the present technology can be freely set as long as it does not impair the purpose and effect of the present technology. In the present technology, the lower limit of the content of the cell regulator relative to 100 parts by mass of the resin component in the resin composition is, for example, 0.05 parts by mass or more, preferably 0.1 parts by mass or more, and more preferably 0.5 parts by mass or more. By setting the content of the cell regulator in the resin composition within this range, the shrinkage of the foam can be more effectively suppressed.

[0075] In the present technology, the upper limit of the content of the cell regulator per 100 parts by mass of the resin component in the resin composition is, for example, 10.0 parts by mass or less, preferably 7.0 parts by mass or less, and more preferably 4.0 parts by mass or less. By setting the content of the cell regulator in the resin composition within this range, it is also possible to contribute to cost reduction.

[0076] In the present technology, the cell regulator can be used as a master batch in which the cell regulator is dispersed in the resin component. By using the cell regulator master batch, the dispersibility in the resin component can be improved.

[0077] (1-5) Other ingredients In producing the tubular resin foam used in the tubular body of the present technology, one or more of various components that can be used in the production of resin foams can be freely selected and used as other components depending on the purpose, as long as the purpose and effects of the present technology are not impaired.

[0078] Examples of components that can be used in producing the cylindrical resin foam used in the cylindrical body of the present technology include foaming assistants, inorganic fillers, foam stabilizers, lubricants, flame retardants, stabilizers, plasticizers, colorants, antioxidants, dispersants, and ultraviolet absorbers.

[0079] (1-6) Average surface roughness of the outer periphery of a cylindrical resin foam The average surface roughness of the outer periphery of the tubular resin foam used in the tubular body according to the present technology is not limited as long as it does not impair the action and effect of the present technology, but is preferably 200 μm or less, more preferably 180 μm or less, even more preferably 170 μm or less, still more preferably 160 μm or less, particularly preferably 150 μm or less, and even more particularly preferably 140 μm or less. By setting the upper limit of the average surface roughness of the outer periphery within this range, not only can the appearance of the tubular resin foam be improved, but also the workability and productivity of the skin lamination step can be improved and peeling between the tubular resin foam and the skin can be prevented.

[0080] The lower limit of the average surface roughness of the outer periphery of the tubular resin foam is not particularly limited, but is, for example, 30 μm or more, preferably 50 μm or more, more preferably 60 μm or more, even more preferably 80 μm or more, still more preferably 100 μm or more, and particularly preferably 110 μm or more. By setting the lower limit of the average surface roughness of the outer periphery of the tubular resin foam within this range, a foam with a lower density can be obtained.

[0081] (1-7) Density The density of the cylindrical resin foam used in the cylindrical body according to the present technology can be freely set as long as it does not impair the purpose and effect of the present technology. In the present technology, the lower limit of the density of the cylindrical resin foam is, for example, 10 kg / m 3 More than 13kg / m 3 More preferably, 17 kg / m 3 More preferably, 20 kg / m 3 By setting the lower limit of the density of the cylindrical resin foam within this range, it is possible to prevent the cylindrical resin foam from becoming too soft and to impart appropriate elasticity to the cylindrical resin foam.

[0082] The upper limit of the density of the cylindrical resin foam is, for example, 50 kg / m 3 Less than 40 kg / m 3 Less than or equal to 35 kg / m 3By setting the density of the cylindrical resin foam within this range, the cylindrical resin foam can be prevented from becoming too hard and losing its flexibility, and can be provided with appropriate cushioning properties. In addition, the insulating properties and heat retention properties can be improved.

[0083] In the present technology, the density of the cylindrical resin foam is a value measured in accordance with a method based on JIS K6767.

[0084] (1-8) Inner diameter The inner diameter of the cylindrical resin foam used in the cylindrical body according to the present technology can be freely set as long as it does not impair the purpose and effect of the present technology. The lower limit of the inner diameter of the cylindrical resin foam is, for example, 10 mm or more, preferably 13 mm or more, more preferably 14 mm or more, and even more preferably 15 mm or more. By setting the lower limit of the inner diameter of the cylindrical resin foam within this range, it is possible to improve moldability.

[0085] The upper limit of the inner diameter of the tubular resin foam is, for example, 80 mm or less, preferably 70 mm or less, and more preferably 65 mm or less. By setting the inner diameter of the tubular resin foam within this range, the tubular body can have an appropriate thickness, and the insulation and heat retention properties can be improved.

[0086] (1-9) Outer diameter The outer diameter of the tubular resin foam can be freely set as long as it does not impair the object and effect of the present technology. The lower limit of the outer diameter of the tubular resin foam is, for example, 30 mm or more, preferably 35 mm or more, more preferably 45 mm or more, and even more preferably 50 mm or more. By setting the lower limit of the outer diameter of the tubular resin foam within this range, the tubular body can have an appropriate thickness, and the insulation and heat retention can be improved.

[0087] The upper limit of the outer diameter of the tubular resin foam is, for example, 100 mm or less, preferably 90 mm or less, and more preferably 80 mm or less. By setting the outer diameter of the tubular resin foam in this range, moldability can be improved.

[0088] (1-10) Thickness The thickness of the cylindrical resin foam used in the cylindrical body according to the present technology can be freely set as long as it does not impair the purpose and effect of the present technology. In the present technology, the lower limit of the thickness of the cylindrical resin foam is, for example, 5 mm or more, preferably 7 mm or more, more preferably 8 mm or more, and even more preferably 10 mm or more. By setting the lower limit of the thickness of the cylindrical resin foam within this range, it is possible to improve the insulation property and heat retention property.

[0089] The upper limit of the thickness of the tubular resin foam is, for example, 50 mm or less, preferably 40 mm or less, and more preferably 30 mm or less. By setting the thickness of the tubular resin foam in this range, moldability can be improved.

[0090] (1-11) Breaking tension of remelt at 115℃ The tubular resin foam used in the tubular body according to the present technology is crushed and remelted, and the remelted product has a breaking tension at 115° C. of preferably 0.09 N or more, more preferably 0.10 N or more, even more preferably 0.13 N or more, even more preferably 0.15 N or more, and particularly preferably 0.16 N or more. When the breaking tension at 115° C. of the remelted product is within this range, a foam having a lower density can be obtained.

[0091] In addition, in the present technology, the breaking tension of the remelt at 115° C. is preferably 0.28 N or less, more preferably 0.26 N or less, even more preferably 0.25 N or less, even more preferably 0.24 N or less, and particularly preferably 0.23 N or less. When the breaking tension of the remelt at 115° C. is within this range, a foam with good moldability can be obtained.

[0092] In this technique, the breaking tension of the remelted material at 115° C. is a value measured by the method described above.

[0093] (2) Peel strength between cylindrical resin foam and skin In the cylindrical body according to the present technology, the peel strength between the cylindrical resin foam and the skin material is not particularly limited as long as it does not impair the action and effect of the present technology, but is preferably 1.5 N / 20 mm or more, more preferably 1.7 N / 20 mm or more, and even more preferably 2.0 N / 20 mm or more. If the peel strength is in this range, peeling of the surface material during use can be prevented in various applications.

[0094] The upper limit of the peel strength between the tubular resin foam and the skin material is not particularly limited as long as it does not impair the action and effect of the present technology, but it can be, for example, 10 N / 20 mm or less. By setting the upper limit of the peel strength between the tubular resin foam and the skin material within this range, it becomes easier to separate the tubular resin foam and the skin material when recycling the tubular body, etc.

[0095] In the present technology, the peel strength between the tubular resin foam and the skin material is a value measured by the method described in the examples below.

[0096] (3) Average surface roughness of the cylindrical body The average surface roughness of the cylindrical body according to the present technology is not limited as long as it does not impair the function and effect of the present technology, but is preferably 50 μm or less, more preferably 40 μm or less, and even more preferably 30 μm or less. By setting the upper limit of the average surface roughness of the cylindrical body within this range, not only can the appearance of the cylindrical body be improved, but also peeling between the cylindrical resin foam and the skin material can be prevented.

[0097] The lower limit of the average surface roughness of the cylindrical body is not particularly limited, but can be, for example, 1 μm or more.

[0098] In the present technology, the average surface roughness of the cylindrical body is a value measured in accordance with JIS B0601:1994.

[0099] (4) Thickness shrinkage rate The thickness shrinkage rate of the cylindrical body according to the present technology is not limited as long as it does not impair the action and effect of the present technology, but is preferably 7% or less, more preferably 5% or less, and even more preferably 4% or less. When the upper limit of the thickness shrinkage rate of the cylindrical body according to the present technology is within this range, deterioration of the quality due to changes in the surrounding environment such as temperature changes of the cylindrical body can be prevented.

[0100] The lower limit of the thickness shrinkage rate of the cylindrical body according to the present technology is not particularly limited, and the closer it is to 0, the more the quality degradation due to changes in the surrounding environment, such as temperature changes of the cylindrical body, can be prevented.

[0101] In this technology, the thickness shrinkage rate of the cylindrical body is a value measured after heating the skin part of the cylindrical body at 70°C for 168 hours and then curing for 24 hours in accordance with JIS A9511.

[0102] 2. Manufacturing method of cylindrical resin foam and resin foam to which skin material is to be attached The cylindrical resin foam according to the present technology has characteristic physical properties, and the manufacturing method thereof is not particularly limited as long as it does not impair the functions and effects of the present technology. The cylindrical resin foam can be manufactured by one or a combination of two or more general manufacturing methods for cylindrical resin foams.

[0103] In this technique, it is preferable to carry out extrusion molding. Specifically, for example, a raw material resin and, if necessary, additives such as a shrinkage inhibitor and a bubble adjuster are fed to an extruder and mixed under heat, and then a foaming agent is injected and further kneaded to prepare a foamable molten resin composition. The prepared foamable molten resin composition is introduced into an annular die provided downstream of the extruder, and extruded from the tip of the annular die into the atmosphere to foam, thereby producing a cylindrical foam.

[0104] When producing a resin foam other than a cylindrical shape (for example, a sheet or plate shape), the shape of the die downstream of the extruder can be designed according to the purpose to produce a foam of the desired shape.

[0105] 3. Manufacturing method of the skin material and the cylindrical body The skin material according to the present technology can be manufactured by extrusion molding on the surface of a resin foam. Specifically, for example, a raw material resin and, if necessary, additives such as a pigment are fed to an extruder and heated and mixed to prepare a molten resin composition. The prepared molten resin composition is introduced into a die provided downstream of the extruder and extruded from the tip of the die onto the surface of a resin foam, thereby manufacturing the skin material.

[0106] The cylindrical body according to the present technology can be manufactured by extruding a skin material on the outer periphery of a cylindrical resin foam. Specifically, for example, a raw material resin and, if necessary, additives such as a pigment, are supplied to an extruder and heated and mixed to prepare a molten resin composition. The molten resin composition is introduced into an annular die provided downstream of the extruder and extruded from the tip of the annular die onto the outer periphery of a tubular resin foam, thereby producing a tubular body.

[0107] 3. Applications for resin foam and cylindrical bodies with skin materials bonded to them The resin foam to which the skin material according to the present technology is bonded and the cylindrical body according to the present technology can be used for various applications in various fields by utilizing their high quality. For example, they can be suitably used as pipe insulation materials, architectural cushioning materials, architectural insulation materials, architectural soundproofing materials, packaging materials, vehicle cushioning materials, architectural interior materials, vehicle interior materials, etc. Among these, the resin foam to which the skin material according to the present technology is bonded and the cylindrical body according to the present technology can be suitably used for insulation applications, particularly as pipe insulation materials. EXAMPLES

[0108] The present technology will be described in more detail below based on examples. Note that the examples described below are representative examples of the present technology, and the scope of the present technology is not to be interpreted narrowly by these examples.

[0109] (1) Raw materials Resin 1: Low-density polyethylene (LDPE) (MFR: 2.7g / 10min, melting point: 110℃) Resin 2: Ethylene vinyl acetate copolymer (EVA) (MFR: 2.8g / 10min, melting point: 75℃) Resin 3: Polyolefin elastomer (POE) (MFR: 13g / 10min, melting point: 60℃) Resin 4: Polyolefin elastomer (POE) (MFR: 0.5g / 10min, melting point: 37℃) Pigment (Pigment Masterbatch): Masterbatch of 50% pigment and 50% resin (low density polyethylene (LDPE)).

[0110] (2) Adherend (resin foam) As the resin foam to be adhered, a non-crosslinked polyolefin resin foam having the physical properties shown in Table 1 below was used.

[0111] [Table 1]

[0112] (2) Manufacturing the cylindrical body The resin and pigment master batches shown in Table 2 below were fed to a compounder and heated and kneaded to prepare a molten resin composition. The prepared molten resin composition was fed to an extruder, and further introduced into an annular die provided downstream of the extruder, and laminated onto the surface of a resin foam shown in Table 1, which was an adherend, while being extruded from the lip at the end of the annular die, to produce a cylindrical body with a skin material adhered to the outer periphery of the cylindrical resin foam.

[0113] [Table 2]

[0114] (3) Measurement and evaluation of physical properties The take-up speed and dynamic friction coefficient of the raw material resin component at 115°C, the thickness of the skin material of the produced cylindrical body, the average surface roughness of the outer periphery of the cylindrical body, density, and feel were measured or evaluated using the methods described below.

[0115] [Taking speed at 115℃] The breaking tension at 115°C was measured using a capillograph. Specifically, the raw resin was discharged from a capillary having a diameter of 1.00 mm and a length of 10.0 mm in a temperature environment set at 115°C at a shear rate of 10 m / min, and the discharged molten resin (strand) was taken up by a take-up roller via a pulley-shaped load cell. The speed of the take-up roller was accelerated, and the take-up speed (m / min) of the take-up roller at the time of the strand breaking was measured.

[0116] [Kinematic friction coefficient] The dynamic friction coefficient of the skin portion of the produced cylindrical body was measured in accordance with JIS K7125.

[0117] [Skin thickness] The thickness of the skin portion of the produced cylindrical body was measured at six points with a micrometer, and the average value was taken as the skin thickness.

[0118] [Surface roughness] The surface roughness of the produced cylindrical body was measured in accordance with JIS B0601:1994.

[0119] [Thickness shrinkage rate] In accordance with JIS A9511, the skin portion of the produced cylindrical body was heated at 70°C for 168 hours, and then cured for 24 hours, and the shrinkage rate was measured.

[0120] [Peel strength] The produced cylindrical body was heated at 70°C for 168 hours, cured for 24 hours, and cut to a width of 20 mm and a length of 220 mm to prepare a sample. The surface of the sample was peeled off by 120 mm, and the sample was attached to a tensile tester, and a peel test was performed at a tensile speed of 500 mm / min. The calculated average test force was taken as the peel strength.

[0121] [Touch] The texture was evaluated by five panelists according to the following criteria. 〇: No problems with surface unevenness △: There are some defects in the surface unevenness, but it is within the acceptable range. ×: Defective surface unevenness

[0122] [tear] ○: No tears ×: Torn

[0123] [Productivity] ○: Production possible with current equipment ×: Impossible to produce with current equipment

[0124] (4) Results The results are shown in Table 3 below. [Table 3]

[0125] (5) Discussion As shown in Table 3, in Examples 1 to 7, which used a resin composition with a take-off speed of 9.0 m / min or more at 115°C and a skin material with a dynamic friction coefficient of 0.50 or less, all evaluations were good, even though the skin thickness was as thin as 0.6 mm or less. On the other hand, in Comparative Example 1, which used a skin material f made of a resin composition with a take-off speed of less than 9.0 m / min at 115°C, the touch was poor and tears occurred. In Comparative Examples 2 to 4, which used skin materials g to i with a dynamic friction coefficient of more than 0.50, the peel strength between the resin foam and the surface material was weak, resulting in poor productivity.

Claims

1. A skin material adhered to a surface of a resin foam, an extrusion molded article comprising a resin composition having adhesiveness to the resin foam, The resin composition has a take-off speed of 9.0 m / min or more at 115° C., The extrusion molded article has a dynamic friction coefficient of 0.50 or less in accordance with JIS K7125.

2. 2. The skin material according to claim 1, which has a thickness of 0.6 mm or less.

3. A cylindrical resin foam body a skin material bonded to an outer periphery of the cylindrical resin foam, A cylindrical body, wherein the skin material is the skin material according to claim 1 or 2.

4. The cylindrical body according to claim 3 , wherein a peel strength between the cylindrical resin foam and the skin material is 1.5 N / 20 mm or more.

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