JPH09227858A - Sealing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing material having excellent sealability, i.e., airtightness and watertightness, good handleability and workability and excellent durability. SOLUTION: This material comprises a high molecular organic material and a softener and has a hardness (JIS K6301 scale A) of 0-25 deg., a compression set (at 100 deg.C, JIS K6301) of 50% or below and an MFR (at 230 deg.C, JIS K7210) of 10g/10min or above. Alternatively, it comprises 100 pts.wt. organic high molecular material, 50-500 pts.wt. softener having a solubility parameter different from that of the organic high molecular material by 3.0 or below and 10-250 pts.wt. polyphenylene ether. The organic high molecular material is a polymer obtained by hydrogenating a copolymer composed of blocks of polystyrene and blocks of polybutadiene, and the softener is desirably selected from among naphthenic, paraffinic and polyisobutylene oils.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing material, and more particularly to a sealing material having excellent handleability and workability.

[0002]

2. Description of the Related Art A sealing material is applied as a gap filling material at a joint of building members, around a window frame mounting portion, a gap in a glass fitting portion, a cracked portion of a building member, and the like. In particular, as prefabricated buildings and lighter weight structures have been developed, the joining of building members is further required, and thus the demand for sealing materials is increasing more and more. Furthermore, with the recent increase in the functionality of buildings, it is required to improve the watertightness and airtightness of the building, and the sealing material is required to have further improved sealing performance and further improved handleability and workability. Has been.

Conventionally, there are two types of sealing materials, one of which is an amorphous type which is filled in the field and the other of which is preformed. For example, the following types of sealing materials are used. .

(1) Oil-based caulking material: a non-elastic material obtained by kneading a mineral filler such as calcium carbonate and a liquid color-developing material such as oil or resin.

(2) Glass putty: The composition is similar to that of the oil-based caulking material and has a high viscosity. Although these non-elastic sealing materials have good adhesiveness to the adherend to which they are applied, they have very little restorability after undergoing deformation, and are not suitable for joints where deformation occurs between the adherends. Since it is not suitable, the following sealing materials having adhesiveness and elasticity are widely used.

(3) Rubber-like caulking material (elastic sealant): Polysulfide-based, silicone-based, polyurethane-based, acrylic-based, SBR-based polymer, etc. as a main component There are two types of sealing materials, one is a one-component type which is cured by being exposed to air or is heated and the other is a two-component type which is used by mixing a curing component at the time of construction.

Further, as the molded sealing material, a string-shaped sealing material formed mainly of butyl rubber having low elasticity or low elasticity, polybutene, asphalt containing rubber having adhesiveness, vinyl chloride, heat Plastic elastomer, chloroprene rubber, silicone rubber, EP
Examples thereof include synthetic resins such as DM, synthetic rubber, gaskets formed of asphalt-impregnated foamed urethane, and the like.
These molding sealing materials are extruded materials such as natural rubber, synthetic resin, and synthetic rubber with a special cross section, and are used while being pressed against the adherend, and are widely used in prefabricated and curtain wall construction methods. Airtight materials, glazing gaskets, joint gaskets, etc. may be mentioned.

A sealing material using the above-mentioned material, for example, an amorphous sealing material has a reduced elasticity due to hardening after construction, so that when deformed, the airtightness is deteriorated, and a molded sealing material is also used. Since it is always used in a pressurized state, depending on the material, there is a possibility that it may deform over time and the airtightness may deteriorate.

Further, if the content of a solvent or a low-molecular material is increased in order to improve the shape-following property, the low-molecular component in the material may bleed to deteriorate the appearance or adversely affect the adherend. .

[0010]

As a sealing material, it has excellent sealing properties, that is, when it is filled in a joint, it closely follows the mutual displacement of the materials forming the gaps, resulting in cracks and cracks. For example, it is required to maintain flexibility for a long period of time in order to prevent defects such as impairing hermeticity, and of course, to be excellent in workability and workability. However, further improvement of these characteristics is desired.

The present invention has been made in view of the above-mentioned conventional circumstances, and is excellent in sealing property, that is, airtightness, and is also excellent in handleability and workability, and is also excellent in durability. The purpose is to provide wood.

[0012]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies on a sealing material having excellent properties, and as a result, the thermoplastic material according to the present invention has excellent handleability.
It also has good characteristics in tracking the displacement of the gap.
The inventors have found that an extremely excellent sealing material can be obtained by using this thermoplastic material, and have completed the present invention.

That is, the sealing material according to claim 1 of the present invention is a thermoplastic material containing a high molecular weight organic material and a softening agent, and has a hardness of 0 according to JIS K6301 standard A scale.
° to 25 °, and the compression set at 100 ° C is J
IS K6301 standard is 50% or less, and 23
MFR at 0 ° C is 10g according to JIS K7210 standard.
/ 10 minutes or more.

The thermoplastic material includes 100 parts by weight of a high molecular weight organic material and 50 to 500 parts by weight of a softening agent, and the difference in solubility parameter between the high molecular weight organic material and the softening agent is 3.0. The following is preferable.

The thermoplastic material preferably comprises 10 to 250 parts by weight of polyphenylene ether.

The high molecular weight organic material used in the sealing material of the present invention comprises at least one polymer block containing a vinyl aromatic compound as a main component and at least one polymer block containing a conjugated diene compound as a main component. A hydrogenated block copolymer obtained by hydrogenating a block copolymer, having an average molecular weight of 150,000 to 400,0.
It is characterized by being 00.

Further, the softening agent is one or more selected from naphthenic oils, paraffinic oils or polyisobutylene oils, and its average molecular weight is 450 to 5,000. Characterize.

The sealing material of the present invention is a material of low hardness obtained by combining a high molecular weight organic material and a softening agent, and has excellent shape-following property and adhesiveness, so that it is excellent in sealing property and workability. In addition, by setting the difference in solubility parameter between the high molecular weight organic material and the softening agent to be 3.0 or less, the compatibility of the materials is improved and the bleeding of low molecular weight components can be prevented. There is no concern that the adherend will be affected by low molecular weight components, and it has excellent durability.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

In the present invention, the high molecular weight organic material constituting the sealing material has a number average molecular weight of 20,000.
Above, especially above 30,000, especially above 40,000
The above-mentioned thermoplastic polymer organic materials are preferable. For example, various thermoplastic elastomers such as styrene-based (butadiene-styrene-based, isoprene-styrene-based, etc.), ester-based, amide-based, and urethane-based materials, and hydrogenated and others thereof Modified products, styrene, ABS, olefin (ethylene, propylene, ethylene propylene,
Ethylene styrene type, propylene styrene type, etc.), vinyl chloride type, acrylate type (methyl acrylate type, etc.), methacrylate type (methyl methacrylate type, etc.), carbonate type, acetal type, nylon type, halogenated poly Ether (chlorinated polyether, etc.), halogenated olefin (tetrafluoroethylene,
Thermoplastic resins such as fluorinated-ethylene chloride type, fluorinated ethylene propylene type, cellulose type (acetyl cellulose type, ethyl cellulose type etc.), vinylidene type, vinyl butyral type, alkylene oxide type (propylene oxide type etc.), and Modified rubbers of these resins are exemplified.

As a specific thermoplastic polymer organic material, a material having a hard block such as a crystal structure or an agglomerate structure and a soft block such as an amorphous structure together is particularly preferable. Preferably, specifically, the following are mentioned.

A block copolymer of crystalline polyethylene obtained by hydrogenating a block copolymer of polybutadiene and a butadiene-styrene random copolymer, and an ethylene / butylene-styrene random copolymer.

Obtained by hydrogenating a block copolymer of polybutadiene and polystyrene or a block copolymer of polybutadiene or ethylene-butadiene random copolymer and polystyrene, for example, diethylene of crystalline polyethylene and polystyrene Among them, block copolymers, styrene-ethylene / butylene-styrene triblock copolymers, and the like, among them, styrene-ethylene / butylene-styrene block copolymers.

A block copolymer in which crystalline polyethylene is linked to one end or both ends of an ethylene / butylene copolymer.

Ethylene-propylene rubber. Of these, hydrogenated is a block copolymer composed of at least one polymer block mainly containing a vinyl aromatic compound and at least one polymer block mainly containing a conjugated diene compound. The resulting hydrogenated block copolymer has an average molecular weight of 150,000.
It is preferably from 0 to 400,000. That is,
What is obtained by hydrogenating a block copolymer composed of at least one polymer block mainly composed of a vinyl aromatic compound (one segment) and at least one polymer block mainly composed of a conjugated diene compound Preferred,
A block copolymer having at least two polymer blocks mainly containing a vinyl aromatic compound and at least one polymer block mainly containing a conjugated diene compound (for example, styrene-butadiene-styrene block copolymer). A hydrogenated block copolymer obtained by hydrogenating is more preferable. This styrene-ethylene / butylene-
In a hydrogenated block copolymer represented by a styrene block copolymer, if the average molecular weight is less than 150,000, the compression set may be deteriorated and the airtightness may be deteriorated with time. When it exceeds 000, the fluidity of the material is lowered and the moldability and workability are deteriorated. Therefore, the average molecular weight is preferably in the above range.

The content of the amorphous styrene block in the block copolymer is 10 to 70% by weight, preferably 15%.
It is desirable that the amount is in the range of -60% by weight. The glass transition temperature (Tg) of the amorphous styrene block is 60 ° C.
The temperature is preferably 80 ° C. or higher. As the polymer of the portion connecting the amorphous styrene blocks at both ends, an amorphous polymer is also preferable, for example, an ethylene-butylene copolymer, a butadiene polymer,
Examples include isoprene polymers, and these blocks or random copolymers may be used.

These various thermoplastic polymer organic materials are mainly used alone, but two or more kinds may be blended and used.

As the softening agent used in the present invention, it is preferable to use a low molecular weight material having a number average molecular weight of less than 20,000. Physically, the viscosity at 100 ° C. is 5 × 10 ⁵ centipoise. Below, in particular, 1 × 10
It is preferably ⁵ centipoise or less, and from the viewpoint of molecular weight, the number average molecular weight is preferably less than 20,000, especially 10,000 or less, particularly preferably 5,000 or less. As such a softening agent, usually, a liquid or liquid material at room temperature is preferably used. Further, either a hydrophilic or hydrophobic softener can be used. The softener is not particularly limited, but the following are suitable. Examples of the mineral oil-based, vegetable oil-based, synthetic-based softeners for various rubbers or resins, and the mineral oil-based softeners include naphthene-based and paraffin-based process oils. As a vegetable oil system,
Examples include castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, coconut oil, peanut oil, wood wax, pine oil, olive oil and the like. Among them, one or more selected from paraffinic oil, naphthenic oil, and polyisobutylene oil of mineral oils, and those having an average molecular weight of 450 to 5,000 are preferable. In the oil preferably used as the softening agent, if the average molecular weight is less than 450, the compression set may be deteriorated and the airtightness may be deteriorated with time.
When it exceeds 5,000, the surface of the obtained sealing material becomes sticky, so that the average molecular weight is preferably within the above range.

These softening agents may be used alone or in combination of two or more as long as they have good compatibility with each other.

The blending amount of these softening agents is 50 to 500 parts by weight, preferably 50 to 300 parts by weight, based on 100 parts by weight of the high molecular weight organic material. The amount is 5
If the amount is less than 0 parts by weight, a sufficiently low hardness cannot be achieved, the flexibility of the material is insufficient and the workability is deteriorated, and if it exceeds 500 parts by weight, bleeding of the softening agent is likely to occur, and However, the mechanical strength of the material decreases, which is not preferable.

The sealing material of the present invention is preferably airtight,
In order to exhibit flexibility (shape-following property) and durability, the physical property is that the hardness is 0 ° to 25 ° on the JIS K6301 standard A scale, and the compression set at 100 ° C is 50% on the JIS K6301 standard. Is less than and 2
MFR at 30 ° C is 10 according to JIS K7210 standard
It needs to be g / 10 minutes or more.

The hardness of the sealing material of the present invention is JIS K.
If the hardness exceeds 25 ° on the A scale of 6301 standard, the hardness of the material becomes high, the desired shape conformability to the adherend cannot be obtained, the airtightness and workability deteriorate, and the compression set at 100 ° C. is 50 according to JIS K6301 standard. %, The material may be deformed over time, resulting in a decrease in airtightness and watertightness. If the MFR at 230 ° C is less than 10 g / 10 minutes according to JIS K7210 standard, the workability will be reduced and Both are not preferable because workability (workability) and productivity deteriorate.

The test methods for these physical properties are all JIS
It can be measured according to the K6301 standard or the K7210 standard.

Further, as a characteristic of the sealing material, the elongation at break of the thermoplastic material is 100% or more, more preferably 200% or more, and the adhesive force between the thermoplastic material and the adherend is 0. 0.1 kg / cm ² or more, more preferably 0.2 kg / cm ² or more,
If the elongation at break is less than 100%, the followability of the sealing material with respect to vibration and deformation may be reduced, and the desired airtightness may be lost, and the adhesive force with the adherend is 0.1 kg / cm.
^If it is less than ² , there is a possibility that the adherend may be easily peeled off from the adherend and sufficient airtightness may not be maintained, and thus both are not preferable.

Here, the elongation at break is JIS K625.
It can be measured in accordance with the vulcanized rubber tensile test method in 1. The adhesiveness with the adherend is 2.
5 cm x 2.5 cm, 1.0 cm thick, sandwiched between two test pieces (5 cm x 1 cm and optional thickness) of adherend such as concrete, foam board, foam concrete, metal plate, The test piece of the adherend of the adhesiveness test sample prepared by adhering it under a load of 100 kg / cm ² for 50 minutes under a 25 ° C. atmosphere with a tensile tester was used at 50 mm / min.
It can be calculated and calculated from the value at the time when the sealant is peeled off at the speed of.

In order to have the above-mentioned properties, the polymer organic material constituting the thermoplastic material of the present invention preferably has a three-dimensional continuous network skeleton structure, and the formed three-dimensional continuous network skeletal structure. Has an average diameter of its skeleton of 50 μm
Or less, preferably 30 μm or less, the average diameter of the cells (mesh) is 500 μm or less, preferably 300 μm or less, and the volume fraction of the high molecular weight organic material is [volume of high molecular weight organic material / (volume of high molecular weight organic material) + Volume of softener)] × 10
When it is defined as 0 (%), the volume fraction of the high-molecular organic material is preferably 50% or less, particularly preferably 33% or less.

Further, in order to obtain a sealing material containing a large amount of the softening agent and a smaller amount of the high molecular weight organic material, the solubility parameter value δ of each of the softening agent and the high molecular weight organic material used.
= (ΔE / V) ^1/2 (ΔE = molar evaporation energy, V =
It is preferable to select both materials so that the difference in molar volume) is 3.0 or less, preferably 2.5 or less. If this difference exceeds 3.0, from the viewpoint of the compatibility of both materials, it is difficult to retain a large amount of the softening agent, which becomes an obstacle to lowering the elasticity of the obtained sealing material, and bleeding of the softening agent tends to occur. It is not preferable because the influence on the adherend is a concern.

Further, the sealing material of the present invention may contain a polyphenylene ether resin for the purpose of improving the compression set of the material and improving the durability of the sealing material. The polyphenylene ether resin used here is a homopolymer composed of a bonding unit represented by the following formula or a copolymer containing the bonding unit.

[0039]

Embedded image

In the formula, R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom, a halogen atom or a hydrocarbon group.

As the polyphenylene ether resin, known ones can be used, and specifically, for example, poly (2,2)
6-dimethyl-1,4-phenylene ether), poly (2-methyl-6-ethyl-1,4-phenylene ether), poly (2,6-diphenyl-1,4-phenylene ether), poly (2- Methyl-6-phenylene-1,
4-phenylene ether), poly (2,6-dichloro-)
1,4-phenylene ether) and the like.
A polyphenylene ether copolymer such as a copolymer of 2,6-dimethylphenol and a monovalent phenol (for example, 2,3,6-trimethylphenol or 2-methyl-6-butylphenol) can also be used. Among them, poly (2,6-dimethyl-1,4-phenylene ether) and a copolymer of 2,6-dimethylphenol and 2,3,6-trimethylphenol are preferable, and further,
Poly (2,6-dimethyl-1,4-phenylene ether) is preferred.

The amount of the polyphenylene ether resin compounded is
It can be suitably selected in the range of 10 to 250 parts by weight with respect to 100 parts by weight of the polymer organic material. If it exceeds 250 parts by weight, the hardness of the thermoplastic material becomes high and the flexibility is lost. If it is less than 10 parts by weight, the effect of improving the compression set obtained by compounding is insufficient, which is not preferable.

If necessary, the sealing material according to the present invention may be further blended with the following fillers including the fillers blended with known caulking materials and elastic sealants. That is, clay, diatomaceous earth, silica, talc, barium sulfate, calcium carbonate, magnesium carbonate, metal oxide, mica, graphite, aluminum hydroxide, glass flakes and other flaky inorganic fillers, various metal powders, wood chips, glass Powder, ceramics powder, granular or powdered solid filler such as granular or powdered polymer, and other various natural or artificial short fibers, long fibers (for example, straw, wool, asbestos, carbon fiber, glass fiber, metal fiber) , Other various polymer fibers, etc.)
Fibrous fillers and the like can be blended.

Further, it is possible to reduce the weight by blending a hollow filler, for example, an inorganic hollow filler such as a glass balloon or a silica balloon, an organic hollow filler made of polyvinylidene fluoride or a polyvinylidene fluoride copolymer. Furthermore, it is also possible to mix various foaming agents to improve various physical properties such as weight reduction.
It is also possible to mechanically mix gas during mixing or the like.

In the sealing material of the present invention, in addition to the above components, known resin components and additives can be used in combination for the purpose of improving various properties.

As the resin component, for example, a polyolefin resin or a polystyrene resin can be used in combination. By adding these, the workability and heat resistance of the sealing material can be improved. Examples of the polyolefin resin include polyethylene, isotactic polypropylene, and a copolymer of propylene and a small amount of other α-olefin (for example, propylene-ethylene copolymer, propylene / 4-methyl-1pentene copolymer). , Poly (4-methyl-1 pentene), polybutene-
1 and the like. When isotactic polypropylene or its copolymer is used as the polyolefin resin, its MFR (JIS K7210) is 0.
Those having a range of 1 to 50 g / 10 minutes, particularly 0.5 to 30 g / 10 minutes can be preferably used.

As the polystyrene resin, any resin obtained by a radical polymerization method or an ionic polymerization method can be preferably used as long as it is obtained by a known production method. The number average molecular weight of the polystyrene resin is 5,000-5
00,000, preferably 10,000-200,00
0 and a molecular weight distribution [ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) (Mw / M
n)] is preferably 5 or less.

Examples of the styrene resin include polystyrene and styrene having a styrene content of 60% by weight or more.
Butadiene block copolymer, rubber reinforced polystyrene,
Examples thereof include poly α-methyl styrene and poly p-tertiary butyl styrene, and these may be used alone or in combination of two or more. Further, a copolymer obtained by polymerizing a mixture of monomers constituting these polymers can also be used.

It is also possible to use the polyolefin resin and polystyrene resin in combination. When these resins are added to the sealing material of the present invention, the hardness of the obtained material tends to be higher when the polystyrene resin is used in combination as compared with the case where only the polyolefin resin is added.
Therefore, the hardness of the obtained sealing material can be adjusted by selecting these compounding ratios. In this case, the ratio of polyolefin resin / polystyrene resin is preferably selected from the range of 95/5 to 5/95 (weight ratio).

When these resin components are used in combination, they should be used within a range that does not impair the effects of the present invention, and the compounding amount is 0 to 100 with respect to 100 parts by weight of the polymer organic material.
It is preferred that the amount is about parts by weight. When the compounding amount of the resin component exceeds 100 parts by weight, the hardness of the obtained sealing material becomes too high, the flexibility is lost, and the airtightness and workability are deteriorated, which is not preferable.

As other additives, if necessary,
Flame retardant, antibacterial agent, hindered amine light stabilizer, ultraviolet absorber, antioxidant, colorant, silicone oil, coumarone resin, coumarone-indene resin, phenol terpene resin, petroleum hydrocarbon, rosin derivative, etc. Adhesives such as adhesive (tackifier), Rheostomer (trade name: manufactured by Riken Vinyl Co., Ltd.), High Blur (trade name:
Kuraray Co., Ltd., vinyl-polyisoprene block block copolymer in which polystyrene blocks are linked to both ends), Norex (trade name: Nippon Zeon Co., polynorbornene obtained by ring-opening polymerization of norbornene), etc. A plastic elastomer or a resin can be used in combination.

The method for producing the sealing material of the present invention is not particularly limited, and known methods can be applied. For example, each of the above materials and, if desired, additive components are melt-kneaded using a heating kneader, for example, a single-screw extruder, a twin-screw extruder, a roll, a Banbury mixer, a Brabender, a kneader, a high shear mixer, or the like. Or, or further, if desired, a cross-linking agent such as organic peroxide, a cross-linking aid, or the like is added to the kneaded material, or these necessary components are simultaneously mixed, and the mixture is melt-kneaded by heating, It can be easily manufactured.

Further, a thermoplastic material prepared by kneading a high molecular weight organic material and a low molecular weight material is prepared in advance, and one or more high molecular weight organic materials of the same type or different types as those used here are used. It can also be manufactured by further mixing.

Further, in the sealing material of the present invention,
It is also possible to crosslink by adding a crosslinking agent such as organic peroxide, a crosslinking aid and the like.

Here, as the cross-linking agent which can be added for the partial cross-linking, organic peroxide is preferably mentioned, and specifically, for example, 2,5-dimethyl-2,5-di (t
-Butylperoxy) -hexane, 2,5-dimethyl-
2,5-di (benzoylperoxy) -hexane, t-
Butyl peroxybenzoate, dicumyl peroxide, t-butyl cumyl peroxide, diisopropyl benzohydroperoxide, 1,3-bis- (t-
Butylperoxyisopropyl) -benzene, benzoyl peroxide, 1,1-di (t-butylperoxy) -3,3,5-trimethylcyclohexane and the like, and useful crosslinking aids include, for example, Divinylbenzene, trimethylolpropane triacrylate, ethylene dimethacrylate, diallyl phthalate,
Examples include quinone dioxime, phenylene bismaleimide, polyethylene glycol dimethacrylate, and unsaturated silane compounds. These organic peroxides and crosslinking aids are used in an amount of 0.1% based on 100 parts by weight of the whole compounding material.
The degree of crosslinking can be adjusted arbitrarily in the range of 1 to 5 parts by weight. These organic peroxides and crosslinking assistants can be used in combination of two or more, if necessary. When an unsaturated silane compound is used as a crosslinking aid, crosslinking can be further advanced by contact with moisture in the presence of a silanol condensation catalyst.

The thus obtained sealing material of the present invention may be used as it is as an amorphous sealing material,
It can also be used as a molding sealing material such as a string-shaped sealing material or a gasket by molding it into a desired shape by a known method, for example, injection molding.

For example, concretely, as the amorphous sealing material, a one-pack type sealing material which is hardened by air or temperature, a caulking material, putty, or an agent containing a hardening component on site is used. Examples of the sealing material include a mold-type sealing material. As the molding sealing material, a tape-shaped release material is laminated and molded into a tape shape, and if necessary, cut with scissors or a cutter to a predetermined length. Examples thereof include a sealing material, an airtight material formed into a predetermined cross section suitable for a site to be used, a glazing gasket, and a joint gasket.

The molded sealing material may be composed of only one kind of thermoplastic polymer material constituting the sealing material of the present invention, or may be a laminate of two or more kinds of the above materials. Furthermore, the surface layer of the sealing material of the present invention may be used by being coated with an organic material such as urethane type, polyvinyl acetate type, or silicone type.

The sealing material of the present invention is particularly used as an amorphous sealing material such as an outer wall of a house, indoors, around water (pipes and sinks), window frames, waterproof sealing materials for automobiles (door mirrors, trunks, etc.). Useful for sealing construction.

[0060]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples.

The physical properties of these examples were evaluated by the following methods. (1) Hardness of material The test method was based on JIS K6301 A type evaluation method.

(2) Compression set In accordance with JIS K6301, 100 ° C. × 22 hours, 2
It was evaluated by the residual strain rate after 5% deformation.

(3) MFR Evaluation was carried out at 230 ° C. in accordance with the flow test method for thermoplastics of JIS K7210. (Example 1) (1) Adjustment of sealing material A sealing material was adjusted using the following raw materials.

Polymer organic material 100 parts by weight (styrene-ethylene / butylene-styrene block copolymer: molecular weight 200,000, SP value 8.5) Softener: paraffin oil 58 parts by weight (molecular weight 1,500, SP value 7.8 ) Softener: Paraffin oil 170 parts by weight (molecular weight 750, SP value 7.8) Polyphenylene ether resin 10 parts by weight [Poly (2,6-dimethyl-1,4-phenylene ether)] Polypropylene resin 13.1 parts by weight (iso Tactic polypropylene M-1300, manufactured by Asahi Polypro) Tackifier 3.0 parts by weight (aromatic resin, neopolymer, manufactured by Nippon Oil Co., Ltd.) The above raw materials were well mixed with a Henschel mixer, and the mixture had a diameter of 50 mm. Melt-kneading with a twin-screw extruder at 240 ° C to form pellets of thermoplastic material. It was.

The hardness of this thermoplastic material is 0 ° according to JIS-A, the permanent compression strain is 48%, the MFR is 300 g / min,
Adhesive strength is 0.1 kg / cm ² , elongation at break is 150%
Met. (2) Execution of sealing material When this material was used as a sealing material for the outer wall of the house and was pressed and filled into the gap of the curtain wall on site, it was possible to carry out the sealing operation very easily. It was confirmed that the seal portion had sufficient airtightness and watertightness without cracking or deformation even after the lapse of 3 months, and had sufficient sealing characteristics and durability. (Example 2) (1) Adjustment of sealing material A sealing material was adjusted in the same manner as in Example 1 using the following raw materials.

Polymer organic material 100 parts by weight (styrene-ethylene / butylene-styrene block copolymer: molecular weight 200,000, SP value 8.5) Softener: paraffin oil 58 parts by weight (molecular weight 1,500, SP value 7.8 ) Softener: Paraffin oil 73 parts by weight (molecular weight 750, SP value 7.8) Polyphenylene ether resin 10 parts by weight [Poly (2,6-dimethyl-1,4-phenylene ether)] Polypropylene resin 13.1 parts by weight (iso Tactic polypropylene M-1300, manufactured by Asahi Polypro) Tackifier 3.0 parts by weight (aromatic resin, neopolymer, manufactured by Nippon Oil Co., Ltd.) The hardness of this thermoplastic material is 10 ° according to JIS-A, permanent. compressive strain 40%, MFR is 119 g / min, the adhesive strength is 0.1 kg / cm ^2, elongation at break 150% Was Tsu. (2) Construction of Sealing Material When this material was used to perform the sealing construction similar to that in Example 1, it was possible to perform the sealing construction extremely easily by filling. It was confirmed that the seal portion had sufficient sealing characteristics and durability without cracking or deformation after 3 months. (Comparative Example 1) (1) Adjustment of Sealing Material A sealing material was adjusted in the same manner as in Example 1 using the following raw materials.

Polymer organic material 100 parts by weight (styrene-ethylene / butylene-styrene block copolymer: molecular weight 30,000, SP value 8.5) Softener: paraffin oil 58 parts by weight (molecular weight 1,500, SP value 7.8 ) Softener: Paraffin oil 73 parts by weight (molecular weight 750, SP value 7.8) Polyphenylene ether resin 15 parts by weight [Poly (2,6-dimethyl-1,4-phenylene ether)] Polypropylene resin 12 parts by weight (isotactic) Polypropylene M-1300, manufactured by Asahi Polypro) Tackifier 3.0 parts by weight (aromatic resin, neopolymer, manufactured by Nippon Oil Co., Ltd.) The hardness of this thermoplastic material is 5 ° according to JIS-A, permanent compression set. Is 95%, MFR is 300 g / min, and adhesive strength is 0.
The elongation at break was 1 kg / cm ² , and the elongation at break was 150%. (2) Execution of sealing material When this material was subjected to sealing in the same manner as in Example 1, it was confirmed that the material was deteriorated with time and was inferior in airtightness. (Comparative example 2) (1) Adjustment of sealing material A sealing material was adjusted in the same manner as in Example 1 using the following raw materials.

Polymer organic material 100 parts by weight (styrene-ethylene / butylene-styrene block copolymer: molecular weight 200,000, SP value 8.5) Softening agent: paraffin oil 58 parts by weight (molecular weight 1,500, SP value 7.8 ) Softener: Paraffin oil 73 parts by weight (molecular weight 400, SP value 7.8) Polyphenylene ether resin 15 parts by weight [Poly (2,6-dimethyl-1,4-phenylene ether)] Polypropylene resin 12 parts by weight (isotactic) Polypropylene M-1300, manufactured by Asahi Polypro) Tackifier 3.0 parts by weight (aromatic resin, neopolymer, manufactured by Nippon Oil Co., Ltd.) The hardness of this thermoplastic material is 8 ° according to JIS-A, permanent compression set. 100%, MFR is 200 g / min, the adhesive strength is 0.1 g / cm ^2, elongation at break was 150% (2) Execution of sealing material When this material was subjected to sealing in the same manner as in Example 1, it was confirmed that the material was deteriorated with time and was inferior in airtightness.

As is clear from the above examples, the sealing material of the present invention is excellent in workability, airtightness and watertightness, and even when it is used for a long period of time, the sealing material has no cracks or elasticity. It did not deteriorate or deform, and was excellent in durability.

On the other hand, Comparative Example 1 obtained by using a hydrogenated block copolymer having a low molecular weight as the high molecular weight organic material and Comparative Example 2 obtained by using a low molecular weight paraffinic oil as the softening agent are both Although the hardness was low, the value of compression set was high and it was out of the range of the present invention. This sealing material was deformed due to settling, resulting in a gap in the seal portion, and its airtightness decreased over time, which was unsuitable as a sealing material.

[0071]

As described above, the sealing material of the present invention is excellent in sealing property, that is, airtightness, and
The handling and workability are remarkably good and the durability is high.

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Claims (5)

[Claims] 1. A thermoplastic material containing a high molecular weight organic material and a softening agent, which has a hardness of 0 ° to 25 ° on the JIS K6301 standard A scale and a compression set at 100 ° C. of 50 according to JIS K6301 standard. %, And the MFR at 230 ° C. is 10 g / 10 minutes or more according to JIS K7210 standard. 2. The thermoplastic material is a high molecular weight organic material 1.
100 parts by weight and 50 to 500 parts by weight of a softening agent are included, and the difference in solubility parameter between each of the high molecular weight organic material and the softening agent is 3.0 or less. Sealing material. 3. The sealant according to claim 1, wherein the thermoplastic material contains 10 to 250 parts by weight of polyphenylene ether. 4. The polymer organic material comprises at least one polymer block containing a vinyl aromatic compound as a main component,
A hydrogenated block copolymer obtained by hydrogenating a block copolymer composed of at least one polymer block mainly composed of a conjugated diene compound, having an average molecular weight of 15
The sealing material according to any one of claims 1 to 3, wherein the sealing material has a viscosity of 10,000 to 400,000. 5. The softening agent is one or more selected from naphthenic oils, paraffinic oils and polyisobutylene oils, and has an average molecular weight of 45.
It is 0-5,000, The sealing material of Claim 1 thru | or 4 characterized by the above-mentioned.