JPH05245998A - Damping resin layer transfer sheet and production of damping laminate using same sheet - Google Patents

Abstract

PURPOSE:To provide a method for producing a laminate which can easily apply damping properties even to an object having a three-dimensional curved surface within a short time. CONSTITUTION:A damping resin layer transfer sheet 1 wherein a damping resin layer 4 is provided on a releasable base material 2 as a transfer layer 3 is inserted in a mold so that the transfer layer 3 is turned toward the cavity of the mold and brought into close contact with the surface of the mold by suction molding such as vacuum molding so as to conform to the surface shape of the base material to be preformed and, thereafter, the mold is closed to inject a molten resin 15 in the cavity and the resin is cooled to integrally and closely bond the transfer layer 4 and the injected resin 15. After the mold is opened, the releasable base material 2 is peeled off to leave only the transfer layer 3 on the surface of a molded product 8 to obtain a damping laminate 9 having the damping resin layer 4 provided on the surface thereof.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a vibration-damping resin layer transfer sheet used for imparting vibration-damping properties to base materials such as office automation equipment, light electric appliances, automobiles, and building materials, and vibration-damping laminates using the transfer sheet. A method of manufacturing a body.

[0002]

2. Description of the Related Art As a conventional vibration damping laminate, a so-called "unrestrained vibration damping laminate" in which a viscoelastic resin such as rubber or polystyrene is laminated on a base material such as an iron plate is known. As the manufacturing method of this vibration damping laminate, a method in which a sheet-shaped viscoelastic resin is attached to the surface of the base material with an adhesive (a laminating method), a paint obtained by diluting the viscoelastic resin with a solvent is applied to the surface of the base material and dried. , A method of curing to form a film (coating method), a method of extruding a viscoelastic resin that has been melted by heating from a T-die and laminating and adhering it onto a substrate (extrusion coating, melt extrusion laminating method), etc. are known. ing.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The conventional method for manufacturing a vibration damping laminate has the following drawbacks. Requires a facility for coating, drying and curing the adhesive, and also requires time for drying the solvent contained in the adhesive. In addition, coating and drying equipment and drying time of the adhesive are required. Especially, in the case of a base material having a three-dimensional curved surface, if the base material has irregularities, the coating material tends to accumulate in the recesses and become thick. It was difficult to form a vibration-damping resin layer having a uniform thickness on the surface of the base material, because the coating material was likely to flow out and become thin on the convex and concave portions. In addition, in the case of, it is necessary to have equipment for melting, extruding, and cooling the resin. Further, in the case of a base material having a three-dimensional curved surface, it is difficult to coat with a uniform film thickness, especially There is a problem that residual air tends to accumulate in the concave portion of the material.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and even if it has a three-dimensional curved surface shape, it is possible to easily provide a damping property in a short time to form a laminate. An object of the present invention is to provide a method for producing a vibration damping laminate and a vibration damping resin layer transfer sheet used in the method.

[0005]

The damping resin layer transfer sheet of the present invention is characterized in that at least a damping resin layer is provided as a transfer layer on a releasable substrate.

Further, in the method for producing a vibration damping laminate of the present invention, the vibration damping resin layer is formed on the base material by transferring the vibration damping resin layer to the base material using the above-mentioned vibration damping resin transfer sheet. It is characterized in that a vibration laminated body is obtained.

In the production method of the present invention, a so-called "non-restraining type" damping laminated body in which a base material is laminated only on one side of the damping resin layer and one side of the damping resin layer is opened is formed as a laminated body. When vibration is applied to the non-restraint type vibration-damping laminate, the vibration-damping resin layer of the vibration-damping laminate absorbs the vibration due to the viscoelastic elongation deformation of the polymer material that accompanies bending vibration, and the vibration-damping is suppressed. When the vibration applied to the laminated body is damped and the damping property is developed, and when the viscoelastic body having a lower density than the base material is laminated, the real part of the acoustic impedance of the acoustic wave of the damping laminated body is lowered. Decrease the efficiency of sound wave generation (exclusively soundproofing)
In any case, the effect is exhibited. Further, the term "vibration suppression" as used in the present invention also includes sound absorption. As the vibration-damping resin layer used in the vibration-damping resin layer transfer sheet of the present invention, the following resins (1) to (3) can be used. Mainly (1) and (2) are used in the above method,
In case of the method of (3), it is preferable to use (3).

(1) In the case where the substrate is a metal plate or molded body which is easily vibrated, polystyrene, ABS or other styrene resin, polyurethane, natural or synthetic rubber, acrylic, polyvinyl chloride or the like resin is used to some extent. The effect is obtained.

(2) The glass transition temperature (Tg) is −60 when a particularly large vibration damping property is imparted, or when a further greater vibration damping property is imparted to a synthetic resin plate or a synthetic resin molded body.
It is preferable to use a viscoelastic resin in which the loss tangent (tan δ) within the glass transition temperature range is tan δ ≧ 0.5, where ℃ ≦ Tg ≦ + 80 ° C. Specific examples of such a viscoelastic resin include those described in a) to i) below.

A) A block (I block) made of a polyisoprene or isoprene-butadiene mixture having a vinyl structure as described in JP-A-3-287651 and a block (S block) made of a vinyl aromatic monomer such as polystyrene. ) And having a molecular weight (Mn) of 30,000 to 300,000 in the molecule.
It is an I-S type block copolymer (vinyl SIS), and the I block has a molecular weight (Mn) of 2500 to 4000.
0, and the S block has a molecular weight (Mn) of 10,000.
Up to 200,000, the content of 3,4 and 1,2 bonds is 4
It is 0% by weight or more, and at least a part of the carbon-carbon double bond in the chain is hydrogenated.

As such a resin, there is VS-1 [trade name of Kuraray Co., Ltd.], which has a molecular weight of 115,000, a styrene content of 20% by weight, a specific gravity of 0.94, a polyisoprene block having a vinyl bond content of 70% by weight, and a polyisoprene block of 70% by weight. Isoprene T
It has physical properties of g of 21 ° C and maximum tan δ of 1.0 (20 ° C).

Inorganic powders such as mica (mica powder), calcium carbonate, white carbon, clay, granular hematite, granular magnetite, and plate-shaped strontium ferrite may be added to the above resin, and a phase such as polybutene may be added. A solubilizer may be added.

B) a melting point of 80 to 160 ° C., 0.5
% Polyamide having a relative viscosity of 1.5 to 2.4 in a m-cresol solution (JP-A-56-151916). Specifically, a copolymer that requires ω-aminoundecanoic acid or lauryllactam, such as nylon 6/66/12, nylon 6/69/12, nylon 6/610/12, nylon 6/612/12, nylon. 6/66/69/12, Nylon 6/66/610/12, Nylon 6 /
66/612/12, Nylon 6/66/11/12, Nylon 6/69/11/12
Etc.

C) Ethylene-vinyl acetate copolymer containing 10 to 30% by weight of vinyl acetate (JP-A-57-3494)
No. 9).

D) 100 parts of polyvinyl butyral resin or 100 parts of a mixture of 50 parts or more of polyvinyl butyral resin and polyvinyl acetate resin with 100 parts of castor oil, triethylene glycol diethyl butyrate, butyl phthal butyl glycolate and ethylene phthalate. A mixture of 100 to 250 parts of a plasticizer such as ethyl glycolate and a tackifier such as a terpene-phenol resin, a rosin ester and a hydrogenated rosin ester in a range of 80 to 200 parts (JP-B-55).
No. 27975).

E) A copolymer obtained by polymerizing a urethane acrylate prepolymer and a vinyl monomer such as acrylonitrile, acrylic ester, vinyl acetate and styrene (Japanese Examined Patent Publication (Kokoku) No. 52-26554). The urethane acrylate prepolymer is a polyol having a hydroxyl group at the terminal (polyester polyol, polyether polyol, etc.) and polyisocyanate (aromatic isocyanate such as toluene diisocyanate, aliphatic isocyanate such as hexamethylene diisocyanate, or these A terminal isocyanate prepolymer obtained by reacting an adduct, etc.) with a monomer having a hydroxyl group such as 2-hydroxyethyl acrylate and a vinylic double bond, and a vinyl group at the terminal and a urethane bond in the molecule. Is to have.

F) An olefin resin multilayer body in which a film of a polyolefin resin A having specific physical properties and a modified polyolefin resin B are laminated (JP-A-60-82349). The resin A has a shear modulus of 8 × 10 ^{7 at} 20 ° C.
1 × 10 ⁷ dyn / cm ² , an elongation of 50% or more, and an olefin resin or an ionomer resin having a tan δ peak temperature in the range of −120 to 80 ° C., and Resin B has a shear modulus of 20 ° C. higher than that of Resin A. It is also a polyolefin resin having a high elongation of 10% or more, a peak temperature of tan δ in the range of -40 to 180 ° C, and an adhesive strength with a metal plate of 8 kg / cm or more.

The polyolefin resin of the above resin A is low density polyethylene, ethylene-propylene copolymer, ethylene-pten copolymer, ethylene-vinyl acetate copolymer, ethylene acrylic acid copolymer, ethylene-methacrylate copolymer. And the ionomer resin is
Α-olefins such as ethylene and α such as methacrylic acid,
Copolymers with β-unsaturated carboxylic acid can be converted into Na ion or Zn
Resin with a structure that is crosslinked with metal ions such as ions,
For example, it is marketed under the trade name of DuPont as "Surlyn".

The polyolefin resin of Resin B is
It is a modified polyolefin obtained by modifying a crystalline polyolefin with a modifying agent such as unsaturated aliphatic carboxylic acid and its anhydride. The above-mentioned crystalline polyolefin is a mono-olefin polymer such as low, medium or high density polyethylene, polypropylene or polybutene-1, olefin copolymer such as ethylene-propylene copolymer or ethylene-butene copolymer and a mixture of these polymers or a small amount of these polymers. It is a mixture of rubber-like substances, and the above-mentioned modifiers are acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid and maleic anhydride.

G) Particle size of 5 to 500 μ in silicone rubber
A synthetic rubber having a vibration-damping property of m is dispersed (JP-A-3-281663).

H) A homogeneous mixture of a thermoplastic urethane resin (first component) and an olefin copolymer (second component), and a resin having a vibration absorption coefficient (tan δ) of 0.3 or more in the mixture (third component). ) Are mixed (JP-A-63-19397).
No. 7). The first component is a thermoplastic polyurethane resin having a urethane bond in the molecule, which is obtained by reacting a polyester having a terminal hydroxyl group with diisocyanate. The second component is ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate-maleic anhydride. Examples thereof include a copolymer (TP), an ethylene-vinyl acetate copolymer (EVA), an ionomer, and a terpolymer.

The third component is an xylene resin, a thermoplastic polyester resin, an acrylic resin such as polymethylmethacrylate or polyethylacrylate, or a resin obtained by modifying these resins with a vinyl resin. Specifically, the xylene resin is a formaldehyde condensate of m-xylene, and the modification vinyl resin is polyethylene, ethylene-vinyl acetate copolymer, styrene-butadiene-styrene block copolymer, styrene elastomer, or the like. ..

I) Homogeneous resin containing 5 to 25 parts by weight of xylene resin (component A), 5 to 45 parts by weight of polyethylene resin and / or 5 to 70 parts by weight of ethylene-vinyl acetate copolymer (component B). blend. Alternatively, one or both of 40 parts by weight or less of a thermoplastic elastomer (component C) and 15 parts by weight or less of a styrene-based low molecular weight copolymer (component D) are added to the above composition (JP-A-63-193831). ).

As the components A and B, the resin as described in the above item h) is used, and as the component C, a styrene-butadiene-styrene block copolymer and a styrene-isoprene-component are used.
Styrene block copolymers, ethylene-propylene elastomers, ethylene-propylene elastomers, ethylene-propylene-diene monomer copolymers, etc., and D
The component is a copolymer of styrene and α-methylstyrene and / or maleic anhydride having a molecular weight of 1000 to 1500.
It is a copolymer.

(3) Further, particularly for the purpose of preventing the generation of sound, that is, imparting soundproofness, one of the effective methods is the radiation impedance Z _R of the sound wave of the transferred substrate to be the sounding body.
There is a method of lowering the real part r _R of (generally complex number Z _R = r _R + jX _R ). This means that when the speaker (transferred substrate) is compared to a speaker, the efficiency of sound wave emission is reduced. As a basis for this, as described in the theory of acoustic engineering (for example, “Acoustic Vibration Engineering”, Shizuo Nishiyama et al., Corona Publishing Co., Ltd., March 10, 1983, first edition, 5th edition), the radiation impedance Z _R This is because the energy W of the radiated sound wave when vibrating the sounding body at the speed V is W = r _R · V ² ··· (1), and it is the same vibration as r _R is lowered. Even if excited at several V, the energy of the generated sound wave is reduced. Here, in general, the real part r _R of the radiation impedance decreases with the density of the sounding body. For example, in the case of a circular piston embedded in a rigid plate, if the radius of the circular plate is a, the density is ρ, the sound velocity is c, and the sound wave function is k, the Bessel function J
₁ , using the Struve function K ₁ , Z _R = πa ² ρc [1-J ₁ (2Ka) / Ka] + j (πρc / 2k ² ) K ₁ 2ka) ··· (2) That is, equation (2) Is expressed as r _R = πa ² ρc [1− J ₁ (2Ka) / Ka] ∝ρc ··· (3), and the sound velocity c is the ratio γ between constant pressure molar specific heat and constant volume molar specific heat. Using atmospheric pressure (static pressure) P ₀ , c = √ (γP ₀ / ρ) (4) Since (4), the following equation (5) is established from the equations (3) and (4). r _R ∝ρ c = √ (ργP ₀ ) ∝ √ (ρ) ・ ・ ・ (5) Therefore, if the density ρ of the sounding body is reduced, the real part r _R of the radiation impedance is reduced and the excitation is performed at the same speed. Even so, the energy W of the generated sound wave is reduced. In order to reduce the effective density of the sounding body, a viscoelastic resin layer having a density lower than that of the sounding body, that is, the substrate to be transferred may be transferred as the damping resin layer. Specific examples of the material as described above include a cellular foamed resin obtained by foaming the resin of (1) or (2). This can be obtained by stirring the organosol or plastisol of the resin of the above (1) or (2) to mechanically foam, or adding a foaming agent to chemically foam. In chemical foaming, a heat-decomposable synthetic resin layer is usually obtained by adding and dispersing a heat-decomposable foaming agent, a plasticizer, a stabilizer, a foaming accelerator, and other additives to the above resin.

As the above foaming agent, sodium bicarbonate,
Inorganic foaming agents such as ammonium carbonate, sodium boron hydride and silicon oxyhydride, azo compounds such as azodicarbonamide, azobisisobutylnitrile and diazobenzene, sulfonyls such as paratoluenesulfonyl hydrazide and 4,4-oxybisbenzenesulfonyl hydrazide Organic blowing agents such as hydrazide compounds, dinitrosopentamethylenetetramine, nitroso compounds such as N, N-dimethyl-N, N-dinitrosoterephthalamide, microballoons containing gas or low boiling organic solvent (or There are foaming agents such as microspheres.

Examples of the plasticizer used for foaming by heating include phthalic acid esters such as dioctyl phthalate, dibutyl phthalate, and butylbenzyl phthalate, phosphoric acid esters such as tricresyl phosphate, alkyldiphenyl phosphate, chlorinated paraffin, and polychlorination. One or more kinds of polyester plasticizers, epoxy plasticizers and the like for vinyl are added.

As the stabilizer, various known stabilizers composed of metal compounds such as epoxidized oil and fat, various chelator lead, tin, zinc, cadmium, barium, magnesium, calcium, etc., and an azo type foaming agent as a foaming accelerator. In the case of using dibasic lead sulfate, tribasic lead sulfate, tribasic lead maleate, dibasic lead stearate, zinc white, urea,
Oxalic acid, ethanolamine and the like are used, and when dinitrosopentamethylenetetramine and the like is used as a foaming agent, oxalic acid, salicylic acid, phthalic anhydride, urea, ethylene glycol, nitric acid, benzoic acid and the like are used.

Other additives include calcium carbonate,
Shirasu balloon, filler such as clay, antimony trioxide,
A flame retardant such as aluminum hydroxide or molybdenum oxide, a mineral spirit, white kerosene, a diluting solvent such as toluene or xylene, a dispersant, various dyes and pigments may be appropriately added.

The thickness of the vibration-damping resin layer formed from the above (1) to (3) is not particularly limited, and may be appropriately selected depending on the desired vibration-damping property, the type and shape of the base material of the laminate. Although it is sufficient, it is usually formed to have a thickness of about 5 to 500 μm.

[0031]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a sectional view showing an example of a vibration-damping resin layer transfer sheet of the present invention.

As shown in FIG. 1, the vibration-damping resin layer transfer sheet 1 of the present invention has at least a vibration-damping resin layer 4 laminated as a transfer layer 3 on a releasable substrate 2. Further, a peeling layer 5, a decorative layer 6, an adhesive layer 7 and the like can be provided if necessary.

As the releasable substrate 2, a film or sheet having a good releasability from the transfer layer 3 is used. Specific materials include polyethylene terephthalate, polybutylene terephthalate, polyester resins such as polyethylene terephthalate-isophthalate copolymer, polyolefin resins such as polyethylene, polypropylene and polymethylpentene,
Polyethylene fluoride such as polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, ethylene-4 fluoroethylene copolymer, nylon 6, nylon 66
Such as polyamide, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer,
Polyvinyl alcohol, vinyl polymers such as vinylon, cellulose triacetate, cellulosic resins such as cellophane, methyl polymethacrylate, polymethacrylate ethyl,
Polyethyl acrylate, acrylic resin such as polybutyl acrylate, polystyrene, polycarbonate, polyarylate, a single layer or a plurality of laminates of synthetic resin films or sheets such as polyimide, or fine paper, thin paper, glassine paper, Examples include paper such as sulfuric acid paper. The thickness of the peelable base material 2 is not particularly limited, but is usually 5 to 200 μm.
m, preferably 12 to 50 μm.

Furthermore, if necessary, the transfer layer 3 and the peelable substrate 2
A release layer may be provided on the releasable base material 2 in order to promote the releasability with respect to. As the release layer, a coating film of a paint obtained by adding a release agent such as a fluorocarbon resin, various waxes and silicones to a known vehicle such as an acrylic resin, a fibrin resin or a vinyl resin, or a release layer is formed. Forming resin such as acrylic resin, fibrin resin, vinyl resin or the like to form a coating film of a paint, mold releasing resin such as fluorine resin, silicone, melamine resin, polyolefin resin, An ionizing radiation crosslinkable polyfunctional acrylate, polyester, epoxy resin or the like is applied and formed into a film by extrusion coating or the like.

The peeling layer 5 has a peeling property with respect to the peelable base material 2, and after the transfer is completed, a resin composition having a desired physical property is selected as a surface protective layer of the transfer layer. Especially when surface scratch resistance, chemical resistance, and stain resistance are required, thermosetting resin,
Alternatively, an ionizing radiation curable resin is usually used. The thickness of the layer is appropriately selected depending on the physical properties, etc.
The thickness is about 10 μm. Specifically, as a thermoplastic resin, a cellulose resin, a styrene resin, an acrylic resin, a vinyl polymer, a rosin ester resin, a polyamide or the like, and as a thermosetting resin, a phenol resin, a urea resin, a diallyl phthalate resin, a urea Resin, melamine resin, guanamine resin, unsaturated polyester resin, polyurethane resin, epoxy resin, aminoalkyd resin, melamine-urea co-condensation resin, silicon resin, polysiloxane, etc. are available. A composition obtained by appropriately mixing a prepolymer, an oligomer, and / or a monomer having a polyunsaturated bond or an epoxy group is used.

The adhesive layer 7 is a layer for transferring and adhering the transfer layer to the transferred material, and is selected from a heat sensitive adhesive, a solvent activated adhesive, an ionizing radiation curable adhesive, etc. according to the application. To do. If the transfer layers other than the adhesive layer 7 such as the damping resin layer 4, the peeling layer 5 and the decorative layer 6 have sufficient adhesiveness by themselves, the adhesive layer 7 may not be provided. The heat-sensitive adhesive used for the adhesive layer 7 exhibits adhesiveness by heating, and a thermoplastic resin, an ionomer or the like is used. Examples of such resins include cellulose derivatives, styrene resins, acrylic resins, vinyl polymers, rosin ester resins, polyisoprene rubber, polyisobutyl rubber, styrene butadiene rubber, rubber resins such as butadiene acrylonitrile, coumarone resin, vinyl. Natural or synthetic resins such as toluene resin, polyamide resin, polychlorinated polyolefin, various ionomers, etc. 1
One kind or a mixture of two or more kinds is used.

The decorative layer 6 is provided for the purpose of imparting a design property such as a pattern or metal vapor deposition, and is provided on the whole surface or a part thereof. The pattern of the decorative layer 6 may be a design of a natural product such as wood grain, stone grain, or cloth grain, a character graphic, a symbol, or various abstract patterns.

Next, a method for manufacturing the vibration damping laminate of the present invention will be described below. 2 to 6 are explanatory views showing an embodiment of the method for producing a vibration damping laminate of the present invention, FIG. 2 is a hot stamping method using an up-down method, FIG. 3 is a hot stamping method using a roll method, 4 is an injection molding simultaneous transfer method, FIG. 5 is a vacuum press simultaneous transfer method, and FIG. 6 is a vacuum lamination method.
Shown respectively. The method for manufacturing the vibration damping laminate of the present invention is shown in FIGS.
As shown in FIG. 3, the vibration damping resin layer transfer sheet 1 is used to transfer the vibration damping resin layer 4 of the transfer sheet 1 to the base material 8 by an arbitrary transfer method. This is to obtain a vibration damping laminate 9 in which the layer 4 is formed.

As the transfer method used in the production method of the present invention, known hot stamping method and injection molding simultaneous transfer method (Japanese Patent Publication No. 2-4080, JP-A-57-1).
29731), vacuum press simultaneous transfer method (Japanese Utility Model Publication No. 1-80500, Japanese Patent Application No. 3-29).
8816) and vacuum lamination method (method described in JP-A-57-51458).
Etc. are used. For these transfer methods, an optimum method may be appropriately selected according to the shape of the base material and the like. .

In the case of the up-down type hot stamping method, as shown in FIG. 2, the transfer layer 3 is placed on the base material 8 so that the transfer layer 3 is in contact with the base material 8, and the transfer sheet 1 is heated by the hot plate 23. Is heated and pressed [(a) in the figure], leaving only the transfer layer 3 on the base material 8 and peeling the releasable base material 2 as shown in (b) in the drawing, and the damping resin layer 4 is laminated. The vibration damping laminated body 9 thus obtained is obtained. In the case of the roll type, as shown in FIG. 3, the vibration-damping resin layer transfer sheet 1 is superposed so that the transfer layer 3 is in contact with the base material 8 side, and the heating roller 2 is heated by the heating device 22.
After heating and pressurizing the transfer sheet 1 with No. 1 [(a) in the figure],
In this method, transfer is performed by leaving only the transfer layer 3 on the base material 8 (transferred material) and peeling the releasable base material 2 (FIG. 2B). These hot stamping methods are most suitable for producing a vibration-damping laminate by transferring to a substrate having a flat surface such as a flat plate, and the facility cost is low and the work can be performed in a short time. There is.

The above-mentioned simultaneous injection molding transfer method is shown in FIG.
As shown in (a), both the female mold 11 and the male mold 12 are opened, and the damping resin layer transfer sheet 1 is inserted into the space (cavity) formed by both molds with the transfer layer side facing the cavity side. Then
As shown in FIG. 3B, the transfer sheet 1 is softened as necessary, suction-molded by vacuum molding or the like on the surface of the female mold, and closely adhered along the surface shape of the base material for preforming, and then the same. As shown in FIG. 6C, the mold is closed and the molten resin 15 is injected into the cavity for cooling, the transfer layer 4 and the injection resin 15 are closely adhered and integrated, and then the mold is opened and taken out [FIG. ], The releasable base material is peeled off [(e) in the figure], and the vibration-damping laminate 9 having the vibration-damping resin layer 4 on the surface is obtained, leaving only the transfer layer 3 on the surface of the molded article [(FIG. f)]. This method is particularly suitable for transferring a resin to a molded product having a three-dimensional curved surface unevenness.

In the above vacuum press simultaneous transfer method, as shown in FIG. 5, a molded product (base material 8) is placed on a stand 24 having holes for vacuum suction, and the vibration damping resin layer transfer sheet 1 is molded. The transfer layer 3 side is placed on the article 8 so that the molded article 8 is faced, and a peeling substrate 2 side is provided with a rubber film 25 such as a silicone rubber which is sucked and closely adhered from the placing table side and heated by a heating device 18 as necessary. Then, the transfer sheet 1 is closely adhered along the shape of the molded article 8 and after cooling, only the releasable base material 2 is peeled off and the transfer layer 3 is left on the surface of the molded article, and the damping resin layer 4 is laminated. A damping laminate is obtained. This method is also most suitable for transfer to a molded article having a three-dimensional curved surface unevenness, like the injection molding simultaneous transfer method.

The above-mentioned vacuum lamination method is shown in FIG.
As shown in (a), the vibration-damping resin layer transfer sheet 1 is inserted between the chambers composed of the upper chamber 16 and the lower chamber 17 so that the transfer layer 3 faces downward. As shown, the damping resin layer transfer sheet 1 is sandwiched between the upper and lower chambers to be joined (closed), the molded product (base material 8) is placed on the stand 24 in the lower chamber 17, and then the upper and lower chambers are put together. After sucking and heating and softening the transfer sheet 1 from the side of the releasable substrate 2 by the heating device 18 in the upper chamber, air (atmospheric pressure or higher) is introduced into only the upper chamber as shown in FIG. Due to the pressure difference between the upper chamber and the lower chamber, the transfer sheet is closely adhered to the surface of the molded body along its shape and integrated, and then both chambers are brought to atmospheric pressure to separate (open) both chambers. (D)], as shown in (E), only the releasable base material 2 of the damping resin layer transfer sheet 1 is peeled off to form the transfer layer 3 as a molded article. Allowed to remain on the substrate 8) surface, the damping resin layer 4 is damping laminate 4 laminated on the base material 8 is obtained [FIG. (F)]. This method is also most suitable for transfer to a molded product having a three-dimensional curved surface unevenness.

The base material 8 used in the method of manufacturing the vibration damping laminate of the present invention is not particularly limited in terms of material and shape. For example, the material is metal such as iron, aluminum, copper, phenol resin, polystyrene, acrylic, polypropylene, A
Any material such as resin such as BS (acrylonitrile-butadiene-styrene copolymer), wood, ceramics such as glass and pottery can be used. Further, as the shape thereof, a flat plate, a curved plate, or a molded body having a three-dimensional curved surface can be used.

The vibration-damping laminate produced by the production method of the present invention can be used for various purposes, but products such as OA, light electric appliances and home appliances such as televisions, receivers, line printers, refrigerators, and laundry are also available. Machine, radio, record (C
D) Structural materials such as players, cabinets for magnetic tape cassette coders (audio or video), halves of audio or video cassette tapes, windows, rollers, etc., and oil pans, engine covers as automobile parts It can be optimally used for doors, floors, walls, ceilings, etc. of building materials.

The present invention will be described in more detail below with reference to specific examples. [Example 1] A release layer was provided on the surface of a biaxially stretched polyethylene terephthalate sheet having a thickness of 25 µm, and the following vibration-damping resin layer composition was applied to the surface of the release layer with a roll coater and dried to give a film thickness. A vibration-damping resin layer having a thickness of 15 μm is formed, and a solution of a vinyl chloride-vinyl acetate copolymer is applied on the surface of the resin layer by a roll coater to a thickness of 3 μm (film thickness when dry) to form an adhesive layer. Then, a vibration-damping resin layer transfer sheet was produced.

Vibration-damping resin layer composition Polystyrene-vinyl structure polyisoprene block copolymer 68 parts by weight Toluene 20 phr Silica powder 2 phr

Then, as shown in FIG. 4 (a), the above-mentioned transfer sheet is inserted into the male mold side (cavity side) between the female mold and the male mold of the injection molding machine to insert the vibration-damping resin layer transfer sheet. (B)
As shown in Fig. 2 (c), the transfer sheet is sandwiched by clamping both molds, and the melted acrylic styrene resin is injected from the spout to make the transfer sheet conform to the mold shape by the heat and pressure of the injected resin. At the same time, it is closely integrated with the injection resin,
Then, the mold is cooled, both molds are released from the mold as shown in FIG. 7D, the peelable base material sheet is peeled off as shown in FIG. A molded product, which was left on the molded product and served as a lid of an electric washing machine, was obtained [(f) in the same figure].

Comparative Example 1 A molded article was obtained by performing injection molding in the same manner as in Example 1 except that the vibration damping resin layer transfer sheet was not used.

The molded products of Example 1 and Comparative Example 1 were excited using an audio frequency oscillator in the frequency band of 10 to 20000 Hz under the same conditions, and the effective value of the amplitude of the surface of the molded product was measured. In the molded product of Example 1, as compared with the molded product of Comparative Example 1, the attenuation of the amplitude of 3 to 12 db (average 6 db) was observed in the above band.

Example 2 Nitrified cotton was applied to the surface of a semi-rigid polyvinyl chloride sheet (containing 20 phr of dioctyl phthalate as a plasticizer) to a film thickness of 3 μm (when dry) to form a release layer. The same vibration-damping resin layer as in Example 1 was formed on the surface of the layer, and an ionomer-based adhesive layer having a thickness of 20 μm (when dried) was formed on the surface of the resin layer to obtain a vibration-damping resin layer transfer sheet.

The above transfer sheet is inserted between the upper and lower chambers so that the transfer layer is on the lower side (base material side) as shown in FIG. 6A, and the four corners are clamped around the lower chamber. Then, the lid (molded product) of the refrigerator formed by press-molding a 2 mm-thick iron plate was placed on the stand in the main room. Next, the same figure (a)
As shown in Figure 5, the upper and lower chambers are joined by sandwiching the transfer sheet by driving the cylinder / piston in the upper chamber, and the mold is clamped.
As shown in, both upper and lower chambers are evacuated to a vacuum, the transfer sheet is heated by an infrared heater and softened, then only the upper chamber is pressurized to atmospheric pressure, and the transfer sheet is integrated on the base material due to the pressure difference between the two chambers. After cooling, both molds are released as shown in (d) of the figure, only the releasable base material sheet is released as shown in (f) of the figure, and the release layer and the damping resin layer are provided on the base material as an adhesive layer. A refrigerator lid having a vibration-damping resin layer was obtained.

[Comparative Example 2] A molded product was obtained by molding in the same manner as in Example 2 except that the vibration-damping resin layer transfer sheet was not used.

When the molded products of Example 2 and Comparative Example 2 were excited in the same manner as in the above-mentioned Example 1 and Comparative Example 1, the molded product of Example 2 was compared within the band of 10 to 20000 Hz. The amplitude (effective value) of 6 to 12 db (average 10 db) was attenuated more than that of the molded article of Example 2.

[0055]

As described above, in the method for producing a vibration-damping laminate of the present invention, a vibration-damping resin layer transfer sheet is used to impart a vibration-damping property by transferring the transfer layer of the transfer sheet to a laminate base material. By adopting the method described above, compared with the conventional method of forming the damping resin layer using a method such as a coating method, a laminating method, or a melt extrusion method, the time required for coating, drying, curing and the like is reduced. Since it is unnecessary and the equipment used for those operations is also unnecessary, it can be easily manufactured. Further, since no solvent is used, there is no possibility that the damping resin layer is deteriorated by the solvent.

When a simultaneous injection molding transfer method such as an injection molding simultaneous transfer method, a vacuum pressing method, or a vacuum lamination method is adopted as the transfer method, since the vibration damping resin layer can be laminated simultaneously with the molding, the vibration damping resin layer is separately provided. The step of forming is unnecessary. Furthermore, according to the production method of the present invention, even with a substrate having a three-dimensional curved surface (unevenness) shape, a vibration-damping resin layer can be formed with a uniform film thickness, and a vibration-damping laminate having excellent vibration-damping properties can be obtained. Be done.

The vibration-damping resin layer transfer sheet of the present invention can reliably produce the above-mentioned vibration-damping laminate.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an example of a vibration-damping resin layer transfer sheet of the present invention.

FIG. 2 is an explanatory diagram for explaining a method for manufacturing a vibration damping laminate of the present invention.

FIG. 3 is an explanatory diagram for explaining a method for manufacturing a vibration damping laminate of the present invention.

FIG. 4 is an explanatory diagram for explaining the method for manufacturing the vibration damping laminate of the present invention.

FIG. 5 is an explanatory diagram for explaining the method for manufacturing the vibration damping laminate of the present invention.

FIG. 6 is an explanatory diagram for explaining the method for manufacturing the vibration damping laminate of the present invention.

[Explanation of symbols]

 1 damping resin layer transfer sheet 2 releasable substrate 3 transfer layer 4 damping resin layer 8 substrate 9 laminate

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // B44C 1/17 K 9134-3K

Claims (2)

[Claims] 1. A transfer sheet comprising at least a vibration-damping resin layer laminated as a transfer layer on a peelable substrate. 2. A vibration-damping laminate, wherein a vibration-damping resin layer is transferred to a base material by using the transfer sheet according to claim 1 to obtain a laminated body having the vibration-damping resin layer formed on the base material. Body manufacturing method.