JP2010116508A - Readily recyclable earthquake-proof mat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earthquake-proof mat preventing turnover or slipperiness, moderately attenuating vibration energy without damaging furniture or household appliances in fixing the furniture or household appliances for shaking of earthquake, vibration etc., and further readily recyclable after disposal when fallen out of use. <P>SOLUTION: The earthquake-proof mat having moderate tackiness, readily recyclable, and having abundant vibration-damping properties, and excellent flexibility, and cushioning properties is obtained by using a mixture of a polystyrenic thermoplastic elastomer and polypropylene as a principal component in a material comprising the earthquake-proof mat. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention has moderate tackiness, is easy to recycle, has excellent vibration damping properties, is excellent in flexibility and slip prevention, and prevents objects from moving and falling due to vibrations such as earthquakes. It is about earthquake-resistant mat to lay under.

Conventionally, various earthquake-resistant members have been proposed as devices for preventing the fall of furniture and home appliances against shaking such as an earthquake, slipping, and slipping. For example, Patent Document 1 discloses a method using a fixture such as a metal fitting or a belt. Proposed.

However, fixing with metal fittings or belts involves nailing or screwing the wall or floor to be installed with the furniture or home appliances to be installed, or using an adhesive, and the target furniture or home appliances. In the case of moving the installation place, there is a problem that marks such as metal fittings and fixing nails remain.

Furthermore, as a method for preventing slippage on indoor objects without using metal fittings or fixing nails, in Patent Document 2, a polyurethane resin sheet is attached to the bottom surface of furniture or home appliances via an adhesive. It is proposed to paste and install.

However, thermosetting resins such as polyurethane have the advantage that they can be easily improved in properties, but they require an irreversible heat-curing reaction, so there is a limit to shortening the molding cycle and to stabilize the quality. Are difficult and difficult to recycle.

Moreover, in the method for preventing the furniture and home appliances from slipping and slipping, the vibration energy is not sufficiently attenuated, and the vibration directly affects the furniture and home appliances. For example, it is assumed that a product such as a personal computer that is structurally vulnerable to vibrations or furniture whose joint strength has been weakened due to long-term use may impair its function or fail to retain its shape.

JP-A-8-294425 Registered Utility Model No. 30635372

In view of the problems of the prior art described above, the object of the present invention is to fix furniture and home appliances against shaking such as earthquakes and vibrations without damaging the furniture and home appliances, Without damage to the wall, it can be fixed with a suitable adhesive force to prevent tipping and slipping, and the vibration energy can be moderately attenuated. When it is no longer used, it can be easily recycled after disposal. An object is to provide a seismic mat that can be used.

The present inventors use moderately sticky, easy to recycle, and have excellent vibration damping properties by using a mixture of polystyrene-based thermoplastic elastomer and polypropylene as a main component for the material constituting the earthquake-resistant mat. The inventors have found that an earthquake-resistant mat having excellent flexibility and cushioning properties can be obtained, and have reached the present invention. In order to achieve the above object, the present invention provides the following means.

[1] A mat formed of a polystyrene-based thermoplastic elastomer alone or a mixture of a polystyrene-based thermoplastic elastomer and polypropylene as a main component, and the weight-mixing ratio of the polystyrene-based thermoplastic elastomer and polypropylene is 100/0 to 60/40. A seismic mat having a thickness of 1 to 20 mm.

[2] In the dynamic viscoelasticity measurement of the mat at 25 ° C. when the frequency is changed to 0.1 to 100 Hz, the storage elastic modulus is 0.5 MPa or less and the loss tangent (tan δ) is 0.2 to 1. The seismic mat according to item 1 above, which is 0.0.

[3] The earthquake-resistant mat according to item 1 or 2, wherein the surface hardness of the mat is a JISA hardness of 15 to 95.

In the invention of [1], since a polystyrene-based thermoplastic elastomer is used as a component constituting the seismic mat of the present invention, it has moderate adhesiveness, is rich in vibration damping properties, flexibility, and cushioning properties. It becomes an earthquake-resistant mat having. In addition, since polypropylene is used as another component constituting the seismic mat of the present invention, the seismic mat can obtain an appropriate hardness, mechanical strength, and viscosity during molding. Furthermore, since the weight ratio of the polystyrene-based thermoplastic elastomer and polypropylene is 100/0 to 60/40, it has suitable flexibility and hardness to prevent the object from moving or falling due to vibration such as earthquake. However, it becomes a seismic mat that does not damage furniture and home appliances due to moderate adhesiveness and slippage prevention, and that does not damage flooring. In addition, since the thickness of the seismic mat is 1 to 20 mm, the installation is easy, and the seismic mat does not greatly impair the appearance even when furniture or home appliances are fixed.

In addition, because it is molded with a mixture of polystyrene-based thermoplastic elastomer and polypropylene as the main components, it is possible to recycle the seismic mat after disposal and recovery when the sheet is no longer needed due to moving furniture or home appliances. It becomes. .

In the invention of [2], in the dynamic viscoelasticity measurement when the frequency is changed from 0.1 to 100 Hz at 25 ° C., the storage elastic modulus is 0.5 MPa or less, and the loss tangent (tan δ) is 0.2 to Since it is 1.0, it is excellent in a softness | flexibility, Furthermore, it can be set as the earthquake-resistant mat excellent in the impact-absorbing power and elastic recovery power.

In the invention of [3], since the surface hardness of the mat is JIS A hardness of 15 to 95, it is possible to obtain an earthquake-resistant mat having an appropriate cushioning property, hardly deforming, and having a slip prevention property.

Hereinafter, preferred embodiments of the present invention will be described. The easily recyclable seismic mat in the present invention is a mat formed mainly of a mixture of a polystyrene-based thermoplastic elastomer and polypropylene, and has excellent vibration damping properties. After use, it is discarded and recovered and then melted as it is. It is a seismic mat that can be recycled as a homogeneous plastic material.

In the present invention, on the premise that a thermoplastic elastomer is used, a polystyrene-based thermoplastic elastomer is used in order to provide an earthquake-resistant mat that has moderate tackiness, excellent vibration damping properties, and excellent flexibility and cushioning properties. In addition, in order to obtain moderate hardness, mechanical strength, and viscosity at the time of molding, polypropylene is blended, and the greatest feature is that the mixture is the main component.

The thermoplastic elastomer used for the earthquake resistant mat of the present invention will be described. The thermoplastic elastomer used in the earthquake-resistant mat of the present invention is mainly a hydrogenated block copolymer obtained by hydrogenating a block copolymer of a vinyl aromatic polymer block such as polystyrene and a conjugated diene polymer block. A composition is mentioned as a suitable material.

Examples of the vinyl aromatic polymer block include styrene, methyl styrene, dimethyl styrene, vinyl naphthalene, and vinyl anthracene. Among these, styrene and methylstyrene are preferable from the viewpoints of elasticity, strength, affinity with other resins, and the like. A vinyl aromatic compound may be used independently and may use 2 or more types together.

Examples of the conjugated diene polymer block include butadiene, isoprene, pentadiene, hexadiene and the like. Among these, isoprene, butadiene or a mixture thereof is preferable from the viewpoint of flexibility. The said conjugated diene polymer block may be used independently and may use 2 or more types together.

The term “pre-hydrogenated block copolymer” refers to a hydrogenated block copolymer having two or more polymer blocks composed of polystyrene in the molecule and one or more polymer blocks composed of a conjugated diene compound. It is a hydrogenated block copolymer to be obtained. In the hydrogenated block copolymer, the polystyrene content is 5 to 5 from the viewpoint of flexibility, moldability, and mechanical strength of the sheet made of the polystyrene-based thermoplastic elastomer obtained. A range of 50% by weight is preferred. If this ratio is less than 5%, the mechanical properties of the sheet are insufficient, and conversely if it exceeds 50%, the viscosity at the time of molding may be extremely high.

The pre-hydrogenated block copolymer is not particularly limited as long as it has a polymer block mainly composed of polystyrene. For example, a block copolymer having a linear, branched, or star-like structure is used. Any of a polymer, a diblock copolymer, a triblock copolymer, a multiblock copolymer, and the like can be selected, but a triblock copolymer is preferable from the viewpoint of vibration damping properties and flexibility.

Therefore, examples of the hydrogenated block copolymer that is a component of the thermoplastic elastomer used in the earthquake-resistant mat of the present invention include styrene-butylene-styrene type triblock copolymer and styrene-isoprene-styrene type triblock copolymer. In addition, styrene-butylene-styrene triblock copolymers with appropriate vibration damping and flexibility are suitable for earthquake resistant mats that prevent slippage and slipping of furniture and home appliances in general homes. A styrene-isoprene-styrene type triblock copolymer, which is excellent in weather resistance, is suitable for use in a window exposed to sunlight.

The compounding quantity of the polystyrene-type thermoplastic elastomer which comprises the earthquake-resistant mat of this invention is 60-100 weight part with respect to 100 weight part of components, Preferably it is 80-100 weight part. If it is less than 60 parts by weight, vibration damping properties, flexibility, and cushioning properties are significantly lowered.

Examples of the propylene-based resin used in the earthquake-resistant mat of the present invention include polypropylene or a copolymer mainly composed of propylene, which is either a homotype polypropylene, a block type of propylene and another small amount of α-olefin, or a random type. One or two or more types selected from these copolymers are preferably used. Of these, homo-type polypropylene resin is preferred. The compounding quantity of a component is 0-40 weight part with respect to 100 weight part of components, and when it exceeds 40 weight part, a softness | flexibility will be inferior.

In addition to the above components, the thermoplastic elastomer used in the present invention is mixed with a process oil such as paraffinic, naphthenic or aromatic oil, liquid paraffin or the like as a softening agent in order to adjust elasticity and the like. be able to. Alternatively, inorganic fillers such as calcium carbonate, talc, carbon black, titanium oxide, silica, clay, barium sulfate, and magnesium carbonate can be mixed for the purpose of improving weather resistance and increasing the amount. Further, inorganic or organic fibrous materials such as glass fibers and carbon fibers can be mixed. In addition, it is also possible to contain various anti-blocking agents, heat stabilizers, antioxidants, light stabilizers, ultraviolet absorbers, lubricants, crystal nucleating agents, foaming agents, colorants and the like.

Since the earthquake-resistant mat of the present invention is composed of a mixture of the above-mentioned polystyrene-based thermoplastic elastomer and polypropylene, it has a feature that it is easy to recycle, which is difficult with a crosslinked rubber or a thermosetting resin.

The seismic mat of the present invention is installed between the floor and walls of buildings to prevent the interior products such as furniture and home appliances from falling over, and being damaged or displaced when a vibration such as an earthquake occurs. In addition, an interior product such as furniture and home appliances is adhesively fixed to a floor, a wall, and the like, and has a function of attenuating vibration energy applied to interior products such as furniture and home appliances. From such an application, the seismic mat of the present invention is usually formed into a flat plate shape, but the shape is not limited as long as the object is achieved, and the shape is matched to the object. It can be formed into a shape.

The thickness of the seismic mat of the present invention is preferably 1 to 20 mm, more preferably 2 to 10 mm in order to achieve the above object. If it is less than 1 mm, the vibration damping properties and cushioning properties are inferior, and if it exceeds 20 mm, the indoor arrangement to be fixed becomes unstable and tends to fall.

The standard of the degree of flexibility and vibration damping of the earthquake resistant mat is, for example, a storage elastic modulus of 0.5 MPa in dynamic viscoelasticity measurement when the frequency is changed from 0.1 to 100 Hz at a constant temperature of 25 ° C. Hereinafter, the loss tangent (tan δ) is preferably 0.2 to 1.0. When the composition of the thermoplastic elastomer material is appropriately set so as to be within this range, it is possible to obtain an earthquake-resistant mat having excellent flexibility, moderate deformability, and elastic force that can absorb impact.

In the seismic mat of the present invention, the storage elastic modulus is 0.01 to 0.5 MPa, and the loss tangent (tan δ) is 25 to 25 ° C. in the dynamic viscoelasticity measurement when the frequency is changed to 0.1 to 100 Hz. The said structural component containing a softening agent is adjusted so that it may become 0.2-1.0. In addition, the numerical value obtained by the dynamic viscoelasticity measurement on the said conditions was performed according to JIS K-6394 (The dynamic property test method of vulcanized rubber and thermoplastic rubber). It is known that the storage elastic modulus thus obtained is related to the adhesive property, and the smaller the value, the more flexible and the cushioning properties. The loss tangent (tan δ) represents a damping property related to the absorption of vibration energy. The larger the value, the higher the damping property and the better the damping property.

The storage elastic modulus of the seismic mat of the present invention under the above conditions is 0.5 MPa or less, preferably 0.4 MPa or less, and the seismic mat has excellent flexibility and cushioning properties. If it exceeds 0.5 MPa, the flexibility is inferior, the cohesive force of the composition is too strong, and there is a risk of damaging the fixed object at the time of peeling. In addition, the loss tangent (tan δ) under the above conditions is 0.2 to 1.0, and the seismic mat has excellent vibration damping properties. If it is less than 0.2, the impact absorbability and the elastic recovery force are insufficient, and if it exceeds 1.0, it becomes difficult to maintain the shape.

The surface hardness suitable for the seismic mat of the present invention is preferably from 15 to 95 degrees, more preferably from 20 to 90 degrees in terms of JISA hardness from the viewpoint of slip prevention. When it is less than 15 degrees, the heat resistance of the earthquake resistant mat is poor, so that it is easily deformed. Moreover, when it exceeds 95 degrees, a friction coefficient will become low and it will become easy to generate | occur | produce deviation by the vibration of the installed furniture and household appliances. The surface hardness can be adjusted by blending process oils such as paraffinic, naphthenic, and aromatic oils, liquid paraffin, and the like as a softening agent.

The seismic mat of the present invention can be obtained by subjecting a mixture of the above-mentioned polystyrene-based thermoplastic elastomer and polypropylene to a conventionally known method such as hot pressing, injection molding, extrusion molding, and calendar molding. Furthermore, you may use the shaping | molding method by two processes which process the detail by compression molding by the sheet | seat and film which carried out extrusion molding or the calendar molding. Moreover, it is also possible to improve the vibration-proof property and damping property of the earthquake-resistant mat by enclosing a viscous fluid such as silicone oil inside the earthquake-resistant mat. A polystyrene-based thermoplastic elastomer and polypropylene can be integrally molded by composite injection molding using two kinds of materials such as two-color molding and insert molding, or multilayer extrusion molding.

EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples.

Table 1 shows the configurations of the examples and comparative examples. Table 2 shows the results of performance evaluation of the seismic mats obtained in the examples and comparative examples. The performance evaluation items will be described below.

<Table 1>

<Table 2>

[Storage Elastic Modulus and Loss Tangent (tan δ)] Using a dynamic viscoelasticity measuring device “DVA-200” manufactured by IT Measurement Control, the frequency dispersion of dynamic viscoelasticity at a temperature of 25 ° C. was measured based on JISK7198. . Table 1 shows values at frequencies of 100 Hz, 10 Hz, 1 Hz, and 0.1 Hz. The chuck span was 10 mm. MPa (megapascal) is a value equal to 0.101972 kgf / mm @ 2.

[Surface hardness] The type A durometer hardness was measured by a method in accordance with JISK6253.

[Appropriate evaluation as an earthquake-resistant mat] The softness estimated from the storage elastic modulus, the vibration control estimated from the loss tangent (tan δ), and the slip prevention estimated from the surface hardness were evaluated based on the following criteria. did. A: Excellent in all of flexibility, vibration control and slip prevention. (Triangle | delta): Any one of a softness | flexibility, damping property, and slip prevention property is inferior. X: Two or more of flexibility, vibration control, and slip prevention are inferior. Or one of them is greatly inferior.

<Examples 1-2> Styrenic thermoplastic elastomer (Kuraray hydrogenated block copolymer, trade name Septon 4055: number average molecular weight 200,000, styrene content 30%, hydrogenation rate 95% or more) and polypropylene (ground polymer) Using polypropylene resin, trade name Grand Polypro B221), softening agent (paraffinic process oil made by Idemitsu Kosan Co., Ltd., trade name Diana Process Oil PW-380) and filler (Whitestone SB made by Shiroishi Calcium) Using a twin screw extruder, it was melt kneaded at 200 ° C. and pelletized. A 4 mm thick sheet was formed from the obtained pellets by hot press molding, and this was punched into a flat plate shape having a vertical width of 50 mm and a horizontal width of 100 mm to obtain an earthquake resistant mat. The obtained seismic mat was rich in vibration control and excellent in flexibility. Moreover, when this earthquake-resistant mat was pulverized and melted, it had good compatibility and could be easily pelletized.

<Comparative Examples 1-2> A seismic mat was obtained in the same manner as in Example 1 except that the styrene thermoplastic elastomer, polypropylene, softener, and filler were blended according to the blending shown in Table 1, respectively. The obtained earthquake-resistant mat was inferior in vibration damping and flexibility.

Comparative Example 3 An earthquake resistant mat was obtained in the same manner as in Example 1 except that the thickness of the earthquake resistant mat was 0.5 mm. The obtained earthquake-resistant mat was inferior in vibration damping and flexibility.

<Comparative Example 4> An earthquake resistant mat was obtained in the same manner as in Example 1 except that the thickness of the earthquake resistant mat was 25 mm. The obtained earthquake-resistant mat had vibration damping properties, but was too flexible to be able to fix the object firmly.

Claims (3)

A mat formed of a polystyrene-based thermoplastic elastomer alone or a mixture of a polystyrene-based thermoplastic elastomer and polypropylene as a main component, wherein the weight ratio of the polystyrene-based thermoplastic elastomer and polypropylene is 100/0 to 60/40, and the mat. A seismic mat having a thickness of 1 to 20 mm. In the dynamic viscoelasticity measurement of the mat at 25 ° C. when the frequency is changed to 0.1 to 100 Hz, the storage elastic modulus is 0.5 MPa or less and the loss tangent (tan δ) is 0.2 to 1.0. The earthquake resistant mat according to claim 1, wherein the earthquake resistant mat is provided. The seismic mat according to claim 1 or 2, wherein a surface hardness of the mat is a JISA hardness of 15 to 95.