JPS6280037A - Laminated structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a laminated structure having excellent vibration damping properties and adhesive properties.

Prior Art> There is an increasing demand for vibration-damping metal plates for use in reducing the weight of metal materials for automobiles and for noise prevention purposes. This type of metal plate has been studied in the past, and it has been found that gold 1 is coated on both sides of the polymer material intermediate I.
Various products in which tAZ is bonded and laminated have been proposed.

For example, those using polyvinyl acetate resin (Special Public Interest
No. 5-34703), one using nylon 12 polyamide elastomer tree H (Japanese Patent Application Laid-Open No. 57-9313)
Publication No. 9).

<Problems of the Prior Art> Although the above &1 layered body has excellent vibration damping properties, there is a problem that the temperature range in which it can be used is narrow and the vibration damping performance deteriorates at temperatures outside this range.

The present invention has been made to overcome the above-mentioned drawbacks and to provide an adhesively laminate structure having vibration damping performance over a wide range of temperatures.

Means for Solving the Problems> The above object of the present invention is to provide a laminated structure comprising a polystyrene block copolymer as an intermediate layer, and metals bonded and laminated on both surfaces of the intermediate layer.

It was found that this can be achieved by

The configuration, embodiments, and effects of the present invention will be described in detail below.

The polystyrene block copolymer of the present invention includes an aromatic vinyl hydrocarbon polymer block having a glass transition temperature of 25°C or higher, preferably 50°C or higher, and a glass transition temperature of 0°C.
Hereinafter, preferably linear, radial, and branched block copolymers made of conjugated diene polymer blocks at −25° C. or lower are included. The above-mentioned aromatic vinyl hydrocarbons, teha, styrene, α-methylstyrene, 0-methylstyrene, p
-Methylstyrene, 1,3-dimethylstyrene, vinylnaphthalene, etc. are examples, and styrene is preferably used.

Examples of the conjugated dienes include butadiene (1°3-butadiene), isoprene (2-methyl-1,3-butadiene), and methylisoprene (2,3=dimethyl-1,3-butadiene).
butadiene), 1,3-pentadiene, etc. Among them, butadiene and isoprene are preferably used.

The proportion of the aromatic vinyl hydrocarbon polymer block, which is the glass phase block, in the polystyrene block copolymer is 10 to 50%, and the proportion of the conjugated diene polymer block, which is the rubber phase block, is 90 to 50%. % is preferred.

There are many combinations of glass phase blocks and rubber phase blocks, and any of them may be used, but a triblock copolymer in which glass phase blocks are bonded to both ends of an intermediate rubber phase block is preferred. In this case, the number average molecular weight of the glass phase block is preferably from 5,000 to 150,000, particularly preferably from 00 to 60,000. The number average molecular weight of the rubber phase block is preferably 10,000 to 300,
000, preferably 30,000 to 150,000 for samurai
It is.

The polystyrene block copolymer can be manufactured using a known glueing anionic polymerization method, but is not particularly limited thereto, and can also be manufactured by cationic polymerization or radical polymerization.

The polystyrene-based block copolymer of the present invention also includes a hydrogenated block copolymer in which a portion of the unsaturated bonds of the block copolymer explained above is reduced by hydrogenation.

Here, it is preferable that 2596 or less of the aromatic double bonds in the aromatic vinyl hydrocarbon polymer block and 80% or more of the aliphatic double bonds in the conjugated diene polymer block are hydrogenated.

Preferred specific examples of polystyrene block copolymers include polystyrene/polybutadiene 7/polystyrene triblock copolymer (SBS), polystyrene/polyisogrene/polystyrene triblock copolymer (SIS
), hydrogenated copolymer of SBS (SEBS), and SBS
Examples include hydrogenated copolymers of IS.

The polystyrene block copolymer of the present invention may contain other components, such as pigments, dyes, flame retardants, heat resistant agents, antioxidants, weathering agents, lubricants, mold release agents, and banding agents, as long as they do not impair the purpose of the present invention. It is possible to add anti-waxing agents, plasticizers, crystal nucleating agents, blowing agents, reinforcing agents, fillers, etc.

The following polymers and/or compounds can be blended into the polystyrene block copolymer of the present invention. That is, polyamide elastomer, polyester elastomer, thermoplastic polyurethane, polystyrene elastomer with different copolymerization composition, l,2-polybutadiene, polyolefin elastomer, polyepoxide, and ethylene vinyl acetate copolymer (EVA), ethylene propylene rubber (EPM, EPDIVI), ionomer resins, chlorinated polyethylene, chlorosulfonated polyethylene, and other ethylene copolymers.

The laminated structure of the present invention is obtained by adhering metal layers to both sides of the intermediate layer 11 made of the polystyrene block copolymer described above. The thickness of the polystyrene block copolymer film forming the intermediate layer is preferably 10 μm to 1 m. The method of adhering polystyrene block copolymers and metals is not limited to Samurai. For example, a method in which a polystyrene-based block copolymer is extruded to form a molten film on a metal plate and then adhered as is, or a method in which a polystyrene-based block copolymer film is formed and then heated and remelted to adhere to the metal plate. , or a method of bonding a film and a metal plate using a known adhesive.

Further, J of the metal plate [J is not particularly limited. Examples include steel plates, copper plates, brass plates, aluminum plates, etc., and the two metal plates may be of the same type or of different types.

<Examples> Unless otherwise specified in the examples, parts mean parts by weight.

Reference Example The polystyrene block copolymer used in the example is shown in Table 1.2.

Hydrogenated polystyrene block copolymers α) and II in Table 2
S'D was produced by hydrogenating the unhydrogenated polystyrene block copolymer (1) and (llD) shown in Table 1, respectively.

Table I: Unhydrogenated polystyrene block copolymer Table 2: Hydrogenated polystyrene block copolymer Represents the amount of unsaturated bond gold.

The following polymers were used in comparative examples.

Polymer (■) 60.0 parts of cyclo2cutam, 33.5 parts of poly(tetramethylene oxide) glycol with a number average molecular weight of 1000
2 parts and relative viscosity derived from 7.7 parts of dodecanedioic acid.
．． 05 polyether ester amide.

Polymer (vIiI) A copolymer derived from 64 parts of vinyl acetate, 18 parts of ethylene and 18 parts of n-butyl acrylate.

Examples 1 to 6, Comparative Examples 1 and 2 Hot press from the polymer shown in the table J: l) JJ
Make a film of 0.12MM and 150xloOx
It was thermally bonded between two steel plates of LO silk with a pressure of 2#/d. These ffl/[For corpses, JIS-68
The T peel strength was determined based on 54. In addition, the laminated structure is
The sample was cut to a size of 00×10 ff, and the temperature dependence of the loss coefficient was measured at a frequency of 3007 using a cantilever vibrating reed method. These results are shown in Table 3.

Table 3 As can be seen in the examples, the laminated structure of the present invention has high T-peel strength, is resistant to adhesion, exhibits a loss coefficient of O,1 or more over a wide temperature range, and exhibits vibration damping. It turns out that he has excellent sex.

<Effects of the Invention> The present invention has the following advantages:
By bonding metal layers on both sides as a 1-1 layer, vibration damping properties are excellent over a wide temperature range from low to high temperatures.

It also has high adhesive strength and excellent workability.

Patent application Daitoshi Co., Ltd.

Claims (1)

[Claims] A laminate structure comprising a polystyrene block copolymer as an intermediate layer and metal layers adhered and laminated on both sides of the intermediate layer.