JP4811938B2 - Low linear expansion multilayer extrusion sheet - Google Patents

Description

  The present invention relates to a low linear expansion extruded sheet used for a lightweight insulation board or the like.

Conventionally, a lightweight heat insulation board using foamed foam as a filler using sheets on the front and back sides is known. For example, boards made of ABS resin sheets on the front and back and urethane foam inside are used for bathroom doors. In addition, a lightweight insulation board (Patent Document 1) formed by tightly stacking foam sheets and constraining them with plastic (Patent Document 1), a lightweight insulation board in which a polyester sheet containing a cavity is laminated on both sides of a synthetic resin foam ( Patent Document 2) and the like have been reported.
However, in these lightweight thermal insulation boards, the coefficient of linear expansion of the face material is not taken into consideration (in the case of ordinary styrene resin, it exceeds 6 × 10 ⁻⁵ / ° C.). When dividing a large space, there was a problem that the board was warped.

  As a method for solving this warpage, a method using an FRP sheet or a metal sheet as the face material of the lightweight heat insulation board can be considered, but an FRP (thermosetting type) sheet (Patent Document 3) is unreacted. Since a large amount of styrene monomer remains, there is a problem that the concentration of volatile organic compounds (VOC) in the air, especially the styrene monomer, becomes high when used in a sealed room, and the weight of the metal sheet becomes heavy. Or improved foam foam adhesion. Many types of glass fiber reinforced thermoplastic resins that can replace FRP are known, but those using crystalline resins such as nylon, PET, PP, etc. have low sheet formability, and secondary There were problems such as difficulty in adhesion during processing.

Glass fiber reinforced AS, which is well known among non-crystalline resins, is oriented in the case of a thin sheet, the glass fiber is oriented, a large difference occurs in the physical and longitudinal properties of the sheet, and the orientation direction during secondary processing. There was a problem that it was easy to crack.
In addition, a method for reducing the linear expansion coefficient by adding flaky powder such as talc to styrene resin has been reported (Patent Document 4). However, in the case where the linear expansion coefficient is 6 × 10 ⁻⁵ / ° C. or less as described above, there is a problem that when a thin sheet of 2 mm or less is cracked or cracked at the time of punching. .
That is, there has never been a reinforced thin sheet having a smooth surface necessary for a lightweight heat insulation board, low VOC, easy secondary processing, and low physical property differences in both length and width.

JP 2003-64795 A JP 2002-99959 A Japanese Patent No. 3098308 Japanese Patent Laid-Open No. 9-272146

  In order to obtain a thin sheet with a small coefficient of linear expansion, a method of using a sheet obtained by adding an inorganic filler such as talc to a thermoplastic resin can be considered, but the normal method is caused by the fact that the inorganic filler roughens the surface. It is impossible to obtain a sheet with a good surface appearance and excellent secondary workability due to the appearance failure and cracking when punching into a certain shape, especially secondary processing. It was. An object of this invention is to provide the low linear expansion extrusion sheet excellent in the secondary workability obtained by extruding the styrene resin containing a specific filler.

The inventors of the present invention have repeatedly studied to solve the above problems and have arrived at the present invention.
That is, the present invention is a low linear expansion extruded sheet as described below.
[1] A sheet composed of two or more layers including at least a surface layer and a main layer, wherein the main layer is composed of a styrene resin (A) and a filler (B), and the filler (B) is flaky. It consists of powder and at least one filler other than flaky powder, the content ratio of the filler (B) in the main layer is 40 to 60 % by mass, and the flakes in the main layer The content ratio of the powdery powder is 15% by mass or more, the styrene resin (A) contains 10 to 50% by mass of the elastomer component (C), the surface layer is ABS or polyurethane , and the physical properties of the sheet are: The linear expansion coefficient is 1 × 10 ^{−5 to} 6 × 10 ⁻⁵ / ° C. in both the vertical and horizontal directions, and the Charpy impact strength is 4 to 50 KJ / m 2. A low linear expansion extruded sheet of less than 2.0 mm.
[ 2 ] The low linear expansion extruded sheet according to [1] , wherein the surface layer is ABS and the content of the styrene monomer is 2000 ppm or less.
[ 3 ] The low linear expansion extruded sheet according to [1] or [2], wherein the surface layer is a laminate film.
[4] The low linear expansion extruded sheet according to any one of [1] to [3], wherein the surface layer is provided on both front and back surfaces of the main layer.
[5] A lightweight heat insulating board comprising a heat insulating material sandwiched between the low linear expansion extruded sheets according to any one of [ 1] to [4] .
[6] A bath lid comprising the lightweight heat insulating board according to [5].

  The low linear expansion sheet of the present invention is excellent in secondary workability such as good surface properties and punching, and can replace FRP in a room where low VOC is required.

  The “main layer” referred to in the present specification means the thickest layer of the plurality of layers excluding the surface layer. In the present invention, the thickness of the main layer is preferably 50% or more of the total thickness, particularly preferably 70 to 90%.

The main layer in the low linear expansion extruded sheet of the present invention comprises a styrene resin (A) and a filler (B), and the filler (B) is at least one kind other than the flaky powder and the flaky powder. It is composed of a filler, the content ratio of the filler (B) in the main layer is 25 to 70 mass%, and the content ratio of the flaky powder in the main layer is 15 mass% or more. Things are necessary. However, the amount component of the filler (B) is such that the linear expansion coefficient of the sheet obtained by forming the styrene resin (A) into a sheet by extrusion molding is 1 × 10 ^{−5 to} 6 × 10 in both the vertical and horizontal directions. It is necessary to blend so that it is ⁻⁵ / ° C. and the Charpy impact strength is 4 to 50 KJ / m ² . And the thickness of a sheet | seat needs to be 0.3 mm or more and less than 2.0 mm.

A low linear expansion sheet having a low physical property ratio in the vertical and horizontal directions in which the linear expansion coefficient is 1 × 10 ^{−5 to} 6 × 10 ⁻⁵ / ° C. in both the vertical and horizontal directions of the sheet. Less warpage due to differences. For example, a heat insulating board using an ABS sheet (7 × 10 ⁻⁵ to 8 × 10 ⁻⁵ / ° C.) that does not contain a normal filler may be warped at a temperature difference of 40 ° C. to 60 ° C.

Further, when a thin sheet of 0.3 mm to 2.0 mm is punched into a certain shape, the Charpy impact strength of the sheet needs to be 4 KJ / m ² or more. Moreover, when a styrene resin having a Charpy impact strength exceeding 50 KJ / m ² is used, it becomes difficult to make the linear expansion coefficient of the sheet 6 × 10 ⁻⁵ / ° C. or less. If the sheet is insufficient in thickness and cannot be tested, the sheets are stacked and fixed. The total thickness of each sheet is used for the thickness of the test piece.
Considering these balances, a more preferable Charpy impact strength is 5 to 20 KJ / m ² .

Specifically, the filler (B) used in the styrene resin (A) is a metal oxide, metal hydroxide, metal carbonate, metal sulfate, metal silicate, carbon, ketjen black, carbon It is selected from fibers, organic substances mainly composed of cellulose, metal fibers and the like.
The filler (B) needs to contain flaky powder, and it is essential that the content of the flaky powder in the main layer is at least 15% by mass. In order to balance the target linear expansion and impact, it is preferable to contain 15% by mass or more of flaky powder.

Flakes are flakes such as scales. Oval-shaped grains are grains that have different vertical and horizontal lengths, such as rice grains. The filler of the flaky powder preferably has an average particle size of 0.5 μm to 1 mm, more preferably 1 μm to 500 μm. Further, the specific gravity of the bulk (JIS-K5101) is preferably 0.1 g / ml to 1 g / ml, more preferably 0.2 g / ml to 0.6 g / ml.
Examples of such flaky powder include talc, mica, mica, and glass flakes. More preferred is talc.

Examples of the metal sulfate include calcium sulfate and barium sulfate.
Metal silicates include calcium silicate (wollastonite, zonotlite), talc, mica, mica, clay, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass fiber, glass beads, glass balloon, silica balun, Examples include glass flakes.

  Glass fiber can be used in any shape such as roving, surfing mat, chopped strand mat, satin weave, lattice weave, plain weave, plain weave, twill weave, net, etc. Any of C-GF (alkali-containing glass fiber), alumina borosilicate glass (E glass) and the like can be used. Moreover, a glass fiber with a diameter of 5-50 micrometers can be used, and a glass fiber of 5-20 micrometers is especially preferable. Moreover, in order to improve adhesiveness with a styrene-type thermoplastic resin, it is preferable to treat the glass fiber surface with commonly used surface treatment agents such as vinyl silane, aminosilane, and chromium compounds.

  Examples of carbon include carbon black, graphite, carbon fiber, carbon balun, and charcoal powder. Examples of organic substances mainly composed of cellulose include wood powder, pulp, rice bran powder, walnut powder, and paper sludge.

These fillers may be used alone as a flaky powder as long as the desired balance between linear expansion and impact strength is obtained, or other flaky powder and a plurality of fillers may be used. A combination of talc or glass flakes and glass fibers, or a combination of talc, glass flakes and glass fibers is preferable.
Further, the content of the filler needs to be 25 to 70% by mass. In order to reduce the linear expansion coefficient, addition of 25% by mass or more is necessary, and in order to maintain the toughness of the sheet, the addition amount needs to be 70% by mass or less. More preferably, it is 40-60 mass%.

As the styrenic resin (A) of the present invention, a polymer obtained by polymerizing an aromatic vinyl monomer alone, an aromatic vinyl monomer, and a monomer copolymerizable with aromatic vinyl, for example, an acrylic ester single monomer Body, a polymer obtained by copolymerizing a monomer mixture containing a (meth) acrylic acid ester monomer, an unsaturated nitrile monomer, and the like, or a mixture thereof.
Examples of the unsaturated nitrile monomer include acrylonitrile and methacrylonitrile. Acrylonitrile is preferred.
Examples of the (meth) acrylic acid ester monomer include methyl methacrylate, methyl acrylate, butyl acrylate, and ethyl acrylate.
Examples of the acrylate monomer include methyl acrylate, ethyl acrylate, and butyl acrylate.

  In order to improve adhesiveness with a filler (B), the styrene resin (A) can be copolymerized with a vinyl monomer containing a carboxyl group or a glycidyl group. Examples of the vinyl monomer containing a carboxyl group include unsaturated compounds containing a free carboxyl group such as acrylic acid, crotonic acid, cinnamic acid, itaconic acid, maleic acid, maleic anhydride, itaconic anhydride, chloro Examples thereof include unsaturated compounds containing acid anhydride-type carboxyl groups such as maleic anhydride and citraconic anhydride, among which acrylic acid, methacrylic acid and maleic anhydride are preferred. Examples of the vinyl monomer containing a glycidyl group include glycidyl methacrylate, glycidyl acrylate, allyl glycidyl ether, methyl glycidyl ether, and methyl glycidyl methacrylate.

In the present invention, the styrenic resin (A) preferably contains an elastomer component (C) in order to improve the impact resistance of the sheet, particularly the crack resistance during punching. Specific examples of the elastomer component (D) include polybutadiene (BR), styrene-butadiene copolymer rubber (SBR), diene rubber such as acrylonitrile-butadiene copolymer rubber (NBR), and acrylic such as polybutyl acrylate. Rubber (AR), polyisoprene (IR), polychloroprene (CR), ethylene-propylene rubber (EPM), ethylene-propylene-diene terpolymer rubber (EPDM), styrene-butadiene block copolymer rubber, styrene-isoprene Block copolymers such as block copolymer rubber, hydrogenated products thereof and the like can be used.
Among these polymers, BR, SBR, NBR, AR and the like are preferable.

  These elastomer components may be added as they are to the styrene resin (A), or an aromatic vinyl monomer or a monomer mixture copolymerizable with the aromatic vinyl monomer is graft-polymerized to the elastomer component. It may be added as a graft polymer obtained. The mass of the elastomer of these graft polymers is the mass of the elastomer before graft polymerization.

  The elastomer component (C) contained in the styrene resin (A) is 10 to 50% by mass. More preferably, it is 15-25 mass%. In order to improve the secondary processability of a sheet that is thin and contains many fillers, especially the cracking during punching, it is necessary to contain 10% by mass or more of the elastomer component (C), and the linear expansion coefficient of the sheet is suppressed. Therefore, it is preferable that it is 50 mass% or less.

  As the styrenic resin (A), acrylonitrile-styrene-butadiene copolymer (ABS), acrylonitrile-styrene copolymer (AS), (meth) acrylic acid methyl-acrylonitrile-styrene-butadiene copolymer (MABS), Acrylonitrile-styrene-acrylic rubber copolymer (ASA), acrylonitrile-styrene-EPDM copolymer (AES) and the like are preferable.

The unsaturated nitrile monomer unit contained in the styrene resin (A) is preferably 2 to 40% by mass. Among these resins, ABS containing 10 to 40% by mass of acrylonitrile and 10 to 30% by mass of butadiene rubber, AS containing 20 to 40% by mass of acrylonitrile, 2 to 10% by mass of acrylonitrile and butadiene MABS containing 10 to 30% by mass of rubber is more preferable.
The method for producing the styrene resin (A) is not particularly limited, and emulsion polymerization, suspension polymerization, bulk polymerization, solution polymerization, a combination of these polymerization methods, and the like can be used.

  The styrene monomer content of the styrene resin (A) and the thermoplastic resin is preferably 2000 ppm or less. Since the styrene monomer concentration in the sheet is proportional to the styrene monomer concentration in the air, if the styrene monomer concentration in the sheet (especially in the thermoplastic resin on the surface layer) exceeds 2000 ppm, the styrene monomer concentration in the air increases. There is a possibility of conflicting with VOC standards in the room. More preferably, it is 1000 ppm or less. The styrene monomer concentration was measured by dissolving 2 g of a sample in 20 ml of DMF (dimethylformamide) and using Shimadzu GC-14A gas chromatography (INJ temperature 250 ° C./capillary column). The quantification is performed using a calibration curve prepared in advance.

  The molecular weight of the styrenic resin (A) may be any, but it is preferably 1 to 30 g / 10 min, more preferably 2 to 20 g / 10 min in terms of MFR (ISO 1133: 220 ° C. 98 N). In order to improve the extrusion processability of the thermoplastic resin (A), the MFR is preferably 1 g / 10 min or more, and in order to make the thickness of the sheet uniform, it is preferably 30 g / 10 min or less.

The low linear expansion sheet of the present invention is produced by blending a thermoplastic resin (A) and a filler (B) in a predetermined range so that physical properties such as sheet formability, sheet appearance, and sheet strength can be balanced.
In order to impart moldability, a plasticizer and a softener may be added to the surface layer and the main layer. The type is not particularly limited as long as it reduces the hardness, but fatty acids and fatty acid metal salts, terpene resins, petroleum resins, PE and PP waxes, paraffinic oils, naphthenic oils and ester oils are recommended. Is done.

The styrene resin (A) constituting the main layer of the present invention includes a styrene resin in which talc is added to ABS resin, a styrene resin in which glass fiber and talc are added to ABS resin, and glass fiber and glass flake in ABS resin. Styrenic resin to which is added.
There is no particular limitation on the method for melt-mixing the components such as the styrene resin and the filler of the present invention, and generally known methods such as single screw extruder, twin screw extruder, Banbury mixer, pressure kneader, mixing roll, etc. Can be used.

  In the styrenic resin (A) of the present invention, an antioxidant, a weathering agent, a metal deactivator, an ultraviolet absorber, a light stabilizer, a bleed / blooming agent, a sealing property improving agent, a crystal nucleus, as necessary. Agent, flame retardant, crosslinking agent, co-crosslinking agent, vulcanizing agent, antibacterial, antifungal agent, dispersant, softener, plasticizer, clay adjuster, anti-coloring agent, foaming agent, foaming aid, oxidation Colorants such as titanium and carbon black, metal powders such as ferrite, or other rubbery polymers such as SBR, NBR, BR, NR, IR, AR, CR, IIR, and other than the above components as required These thermoplastic resins such as polycarbonate resin, polyacetal resin, polyamide resin, polyester resin, polyether resin, polysulfone, polyphenylene sulfide, polyacetal resin, etc. It can be.

The low linear expansion extruded sheet of the present invention needs to be formed in multiple layers in order to improve the surface condition and improve secondary workability.
Any method may be used to obtain a multilayer sheet, but co-extrusion may be performed using two or more extruders, and the sheet that has been seated is applied to the surface during sheet extrusion. It does not matter if it is laminated. In particular, it is preferable to laminate a film excellent in flexibility or impact such as PET, vinyl chloride, styrene, or elastomer.

  Further, the surface layer of the multilayer sheet is preferably a styrene resin having a styrene monomer content of less than 2000 ppm. Since it is necessary to impart surface properties and impact properties to the surface layer, it is preferable not to add a filler or to add a small amount of the elastomer component and 5 to 30% by mass of the elastomer component. More preferably, it is 10-30 mass%. Moreover, as a preferable styrene resin used for the surface layer, an ABS resin is preferable.

If necessary, the surface layer or the front and back layers can be textured using a textured roll during sheet extrusion. Both sides may be textured. Particularly preferably, it is a sheet obtained by applying a texture on one side using a texture roll on one of the three rolls.
The wrinkle-patterned wrinkle pattern may be any pattern such as sand blast, pear texture, or leather wrinkle, but the wrinkle depth average value (Rz: 10-point average roughness) is 5 to 60 μm, preferably 20 to 50 μm pear or sand blast. is there.

  The low linear expansion extruded sheet of the present invention can be printed or painted on the surface, and can be bonded to other materials using an adhesive. The surface of the sheet can be painted, or various designs and designs can be printed on the surface by gravure printing or the like to improve the appearance. Moreover, the low linear expansion sheet of this invention can be combined and used for a part of product by adhere | attaching using another raw material and an adhesive agent.

The multi-layer reinforced sheet of the present invention exhibits an appropriate swelling property with respect to a solvent, and can be in close contact with a paint, ink, or resin material by swelling with a solvent contained in the paint, printing ink, or adhesive. It becomes.
Here, examples of the solvent in which the multilayer reinforcing sheet of the present invention exhibits swelling include methyl ethyl ketone (MEK), acetone, toluene, cyclohexane, normal hexane, ethyl acetate, butyl acetate, isopropyl acetate, methylene chloride, or a mixture thereof. It is done.

By using such a solvent-containing paint, printing ink, or adhesive, the low linear expansion sheet of the present invention can be adhered to the paint, ink, and resin material. For example, in the gravure printing ink, the resin component is EVA, modified vinyl chloride or the like, the solvent is a mixture of MEK, toluene, cyclohexane, butyl acetate, and the like, and can be suitably used for printing the sheet of the present invention. .
Further, for example, as an adhesive, it can be satisfactorily bonded to other materials by a urethane adhesive or a synthetic rubber adhesive using a mixed solvent such as acetone, normal hexane, and butyl acetate.

  As illustrated in FIG. 1, the lightweight heat insulating board of the present invention is characterized by using a low linear expansion extruded sheet on the front and back and containing a heat insulating material inside. FIG. 2 shows an example of the layer structure of the low linear expansion extruded sheet of the present invention. The lightweight heat-insulating board of the present invention is less likely to be warped by using low linear expansion extruded sheets on the front and back sides, even when used for a bath lid, a bath door or the like where a temperature difference occurs. The thickness of the sheet to be used is preferably 0.3 mm to less than 2 mm, more preferably 0.6 mm to 1.5 mm. This thickness is preferable in order to reduce the weight of the heat insulating board. The heat insulating material used for the lightweight heat insulating board may be anything as long as it can insulate, and specifically includes foam, fiber, paper waste and the like. Examples of the foam include foamed polystyrene, urethane foam, PP foam, PVC foam, PE foam, foam beads, and PET foam. Examples of the fibers include wool, cotton, and nonwoven fabric. Examples of paper waste include cardboard and shredder powder.

  The low linear expansion sheet of the present invention can be used for a bath lid, a bath apron, a bus counter, a wall, a partition, and the like. In addition, by using a lightweight insulation board, it can be used for homes, bath walls, roofs, floors, room and office partitions, bath doors, bath lids, and the like.

Hereinafter, the present invention will be described in more detail with reference to examples. In the following examples, parts and% are based on mass unless otherwise specified.
(1) Raw materials used in Examples and Comparative Examples <Styrene Resin (A)>
AS1: Asahi Kasei Chemicals Corporation Acrylonitrile content 30% by mass
Styrene monomer content 1500ppm
ABS1: Asahi Kasei Chemicals Corporation Acrylonitrile content 35% by mass
Butadiene rubber content 15% by mass
MFR 7.2g / 10min (ISO 1133/220 ° C 98N)
Styrene monomer content 1500ppm

<Filler (B)>
GF1 (shape: fiber): Asahi Fiber Glass Co., Ltd. Glasslon CSA-17F05
Diameter 13μm, length 3mm ± 1.5
・ GF2 (shape: flake powder): Nippon Sheet Glass Co., Ltd. Micro glass flakes
REF-140 (particle size distribution: 70 μm to 300 μm is 80 wt% or more)
-Talc (shape: flake powder): Matsumura Sangyo Co., Ltd. Crown Talc PP
(Average particle size 6.0-10.0 μm, bulk density 0.28-0.36 g / ml)

<Elastomer (C)>
・ SEBS1: Tuftec M1943 Asahi Kasei Chemicals Corporation (hydrogenated SBS)
・ TPU1: Elastollan C85A BASF Japan Ltd. (Polyurethane)
-TPU2: Elastollan 1164D manufactured by BASF Japan Ltd. (Polyurethane)

(2) Production method of thermoplastic resin The raw material was supplied to a melt kneader (Toshiba machine TEM35B) (glass fiber was side fed) and melt kneaded to obtain a thermoplastic resin, which was pelletized.

(3) Sheet production
<1> Multi-layer sheet The thermoplastic resin obtained above is extruded into a sheet of 0.1 mm thickness from an extruder X (Toshiba machine single screw extruder 65 mm) at 190 ° C., while the extruder Y (Toshiba machine single screw) A styrene resin or an acrylic resin was extruded from an extruder (40 mm) at 190 ° C. so as to be laminated on a surface layer and a lower layer in a sheet shape having a thickness of about 0.1 mm, and a multilayer reinforcing sheet Z (shown schematically in FIG. 1). (Total thickness 1 mm: the thickness of each layer is shown in FIG. 1).
<2> Single layer sheet The thermoplastic resin obtained above was extruded to a thickness of 1 mm at 190 ° C. using only the extruder X.
<3> Multilayer laminate sheet When extruding the thermoplastic resin obtained above at 190 ° C. to 1 mm thickness using the extruder X, the 0.2 mm thickness sheet of ABS1 prepared in advance was Inserted from between and laminated.

(4) Evaluation method (4-1) Sheet surface state It confirmed using visual observation and the touch.
A: Surface state equivalent to ABS1 single sheet with no filler added. ○: Smooth and not rough to the touch, but die lines are slightly noticeable. Z: The surface is rough.
L: A line-shaped striped pattern is visible.

(4-2) Styrene monomer content Since the styrene monomer concentration in the air is proportional to the styrene monomer concentration in the sheet, it was determined using the styrene monomer in the sheet.
The styrene monomer content was measured by dissolving 2 g of sample in 20 ml of DMF (dimethylformamide) and using a Shimadzu GC-14A gas chromatography (INJ temperature 250 ° C./capillary column). Quantification was performed using a calibration curve prepared in advance.
When the residual styrene monomer concentration is 0.5% or more, the styrene monomer concentration in the air becomes high.

(4-3) Linear expansion coefficient From the sheet produced as described above, the linear expansion coefficient was measured using a sample in the direction perpendicular to the sheet extrusion (ASTM D696).
A linear expansion coefficient of 6 or less is accepted.
If the linear expansion coefficient exceeds 6, warpage or the like is generated due to expansion during heating, so that FRP or the like cannot be substituted.

(4-4) Secondary workability (punchability)
A punching blade with which a square of 10 cm square was punched out was produced, and the punchability when the sheet was punched out was confirmed. ○ Passed above.
◎: 1 out of 10 shots did not crack.
○: 1 to 2 pieces out of 10 pieces were broken.
X: 3 or more pieces out of 10 pieces were cracked.

[Examples 1 to 5]
(Example 1) A thermoplastic resin composed of 50% by mass of ABS1 and 50% by mass of GF2 as a main layer, 0.8 mm, and a multilayer of 1.0 mm each comprising 0.1 mm of ABS1 without filler as front and back layers Sheet (Example 2) ABS1 50% by mass, GF1 25% by mass, talc 25% by mass as the main layer 0.8mm, and filler-free ABS1 as the front and back layers 0.1mm each 1.0 mm multilayer sheet (Example 3) A thermoplastic resin composed of 50% by mass of ABS1, 25% by mass of GF1, and 25% by mass of talc is 0.8mm as the main layer, and a 0.2mm sheet of ABS1 is laminated on the surface layer. 1.0 mm thick multilayer laminate sheet (Example 4) AS1 40% by mass TPU1 30% by mass, GF1 25% by mass, talc 25% by mass A multi-layer laminate sheet having a thickness of 1.0 mm obtained by laminating a thermoplastic resin consisting of 0.8 mm as a main layer and a 0.2 mm sheet of TPU2 on the surface layer (Example 5) AS1 40 mass%, SEBS1 20 mass% GF2 50 mass% thermoplastic resin as the main layer 0.8, filler-free ABS1 as the front and back layers of 0.1mm each multilayer sheet of 1.0mm thickness

[Comparative Examples 1-3]
(Comparative Example 1) A sheet having a surface layer of a 1 mm thick sheet composed of a thermoplastic resin single layer composed of 70% by weight of AS1 and 30% by weight of GF1 subjected to 20 μm (sand blast) embossing with a shibo roll.
(Comparative Example 2) A sheet having a surface layer of a 1 mm thick sheet composed of a thermoplastic resin single layer composed of 80% by mass of ABS1 and 20% by mass of GF1, and subjected to a texture of 20 μm (sandblast) with a textured roll.
(Comparative Example 3)
Commercially available FRP (thermosetting type) 1.0mm thick sheet

  The present invention has a smooth surface, a low linear expansion sheet that is easy to perform secondary processing, and can be used in place of applications where current FRP sheets are used. For example, a bath lid, a bath apron, a bus counter, a wall, a partition, etc. are mentioned.

It is a figure which shows an example of a lightweight heat insulation board. It is a figure which shows an example of the layer structure of the low linear expansion extrusion sheet | seat of this invention.

Claims (6)

A sheet composed of two or more layers including at least a surface layer and a main layer, wherein the main layer comprises a styrene resin (A) and a filler (B), and the filler (B) comprises flaky powder and It is composed of at least one filler other than the flaky powder, the content ratio of the filler (B) in the main layer is 40 to 60 % by mass, and the flaky powder in the main layer The styrene-based resin (A) contains 10 to 50% by mass of the elastomer component (C), the surface layer is ABS or polyurethane , and the physical properties of the sheet are laterally both, linear expansion coefficient, 1 × and a ^{10 -5 ~6 × 10 -5 / ℃} , thickness Charpy impact strength characterized in that it is a 4~50KJ / ^{m 2} is 0.3mm or more 2 Low linear expansion extruded sheet of less than 0.0 mm. Surface is ABS, and low linear expansion extruded sheet according to claim 1 in which the content of styrene monomer and wherein the at 2000ppm or less. The low linear expansion extruded sheet according to claim 1 or 2, wherein the surface layer is a laminate film. The low linear expansion extruded sheet according to any one of claims 1 to 3, wherein the surface layer is provided on both front and back surfaces of the main layer. A lightweight heat insulation board comprising a heat insulating material sandwiched between the low linear expansion extruded sheets according to any one of claims 1 to 4 . A bath lid comprising the lightweight heat-insulating board according to claim 5.

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