JP2009249417A - Hotmelt composition and assembling method of member using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hotmelt composition suitable for a sealing material at a portion receiving a load at high temperature and having a function easily separating a member if necessary and to provide an assembling method of the member. <P>SOLUTION: The member at least one base material of which is a metal is assembled by using the hotmelt composition containing 1 to 50 pts.wt. polyphenylene ether resin having ≥120°C thermal deformation temperature or glass transition temperature, 30 to 300 pts.wt. viscosity modifier to 10 pts.wt. styrene-based block copolymer having number average molecular weight Mn of 100,000 or more and a styrene resin, and preferably having ≥1,000% breaking elongation rate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot melt composition having a function suitable for a sealing material at a site subjected to a load at a high temperature and having a function of easily separating members as necessary, and a method for assembling the members.

  Conventionally, in various industrial fields such as electricity, automobiles, and construction, sealing materials have been used in various parts for the purpose of dust prevention and waterproofing. As the sealing material, in addition to molded packing, those using reactive resins such as silicone resins, urethane resins, butyl rubber resins, polysulfide resins, and hot melt resins are used. Among these, since the resin-based sealing material can be in close contact with the base material at the time of curing, it is superior to the molded packing in that it has excellent followability when the base material is displaced.

Further, hot melt resins are attracting attention because they can be cured quickly by natural cooling after application and improve productivity. By the way, although such a sealing material is used for the connection part of a some member, since it was excellent in the adhesiveness with respect to a base material, it was difficult to disassemble easily like a molding packing. Therefore, it is necessary to replace each unit because it cannot be dismantled even when maintenance inside the sealed member is required, and when dissimilar materials are sealed, they cannot be recovered and recycled by material at the time of disposal. There was a problem that the whole was treated as industrial waste. For example, although Patent Document 1 discloses a hot-melt sealing material with excellent durability, there was no idea of separating the members.
Japanese Patent Laid-Open No. 9-227858

  The present invention provides a hot-melt composition and a method for assembling a member that are suitable for a sealing material at a site that receives a load at a high temperature and that has a function of easily separating the member as required.

  1 to 50 parts by weight of a polyphenylene ether resin having a heat distortion temperature or a glass transition point of 120 ° C. or more, and a viscosity modifier of 30 to 300 with respect to 10 parts by weight of a styrene block copolymer having a number average molecular weight Mn of 100,000 or more. A hot-melt composition containing parts by weight and a styrene resin, preferably having an elongation at break of 1,000% or more. Moreover, it is the method of assembling a member using this hot-melt composition.

  Since the hot melt composition according to the present invention is restored even under a load at a high temperature, it can be used as a sealing material capable of maintaining functions such as dustproofing and waterproofing even under severe conditions. In addition, since the members can be easily separated as necessary, maintenance can be easily performed when maintenance inside the sealed member is required. Furthermore, since it can be separated and collected by material at the time of disposal, the entire unit can be prevented from becoming industrial waste, and the burden on the environment can be reduced.

  Specific examples of styrenic block copolymers used in the present invention include styrene-isoprene-styrene (SIS) block copolymers, styrene-butadiene-styrene (SBS) block copolymers, styrene-ethylene-1 butene-styrene ( SEBS) block copolymer, styrene-ethylene-propylene-styrene (SEPS) block copolymer, poly (α-methylstyrene) -polybutadiene-poly (α-methylstyrene), poly (α-methylstyrene) -polyisoprene -Poly (α-methylstyrene), and hydrogenated modified products thereof, such as poly (α-methylstyrene) -poly (ethylene-1butene) -poly (α-methylstyrene), poly (α-methylstyrene)- There is poly (ethylene-propylene) -poly (α-methylstyrene). From the viewpoint of heat resistance, the number average molecular weight Mn of the styrenic block copolymer is preferably 100,000 or more. In addition, a styrene block copolymer having a number average molecular weight Mn of less than 100,000 can be used in combination with a styrene block copolymer having a number average molecular weight Mn of 100,000 or more.

  Known polyphenylene ether resins can be used. Specifically, poly (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), 2,6-dimethylphenol and monovalent phenols Polyphenylene ether copolymers such as these copolymers can be used. Further, a modified polyphenylene ether resin in which a styrene resin, a nylon resin, or the like is blended with a polyphenylene ether resin to improve workability can be used.

  From the viewpoint of heat resistance, it is preferable that the heat distortion temperature or glass transition point of the polyphenylene ether resin is 120 ° C. or higher. Moreover, the preferable addition amount with respect to 10 weight part of styrene-type block copolymers is 1-50 weight part. When the addition amount is insufficient, the heat resistance of the hot melt composition is not sufficient, and when it is excessive, the flexibility is lowered.

  As the viscosity modifier, low molecular weight substances that lower the melt viscosity, such as atactic polyolefin, polybutene, isobutylene, paraffinic or naphthenic oil, are used alone or as a mixture. The hot melt composition of the present invention also has a role of improving the peelability from the member by increasing the elongation percentage. A preferable addition amount with respect to 10 parts by weight of the styrenic block copolymer is 30 to 300 parts by weight. When the addition amount is insufficient, the peelability of the hot melt composition is not sufficient, and when it is excessive, the heat resistance is lowered.

  Examples of the styrene resin in the present invention include polystyrene, poly α-methylstyrene, styrene-α-methylstyrene copolymer.

  In addition to the above essential ingredients, the hot melt composition of the present invention includes tackifier resins such as terpene resin, terpene phenol resin, rosin resin and petroleum resin, and fillers such as talc, clay, silica, calcium carbonate and titanium oxide. Can be added. Moreover, well-known additives, such as an anti-aging agent and a flame retardant, can be added as needed.

  Since the hot melt composition of the present invention contains the above materials in the above proportions, it has an excellent heat resistance performance such that the compression set after 10 days at 80 ° C. is 90% or less by a measuring method based on the JISK6262 regulations. . Moreover, since the elongation at break becomes 1000% or more, it can be easily separated from the substrate.

  The hot melt composition according to the present invention is prepared by kneading each compounded material with a Banbury mixer, a heating kneader, a biaxial extruder, etc., and cast into a mold to form various shapes, or by extrusion molding. It can be formed into a string or the like. In addition, hand gun type, block melt type, bulk type and foam type can be used for the hot melt composition coating device. When mass-manufacturing workpieces at the factory, the head part of the hot melt coating device is an industrial robot. If it is attached to the surface, it can be applied quickly even to complex shapes, and a significant improvement in production efficiency can be expected.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not restrict | limited to these Examples.

Example 1
100 parts by weight of Septon 4055 (trade name, manufactured by Kuraray Co., Ltd.) as SEPS as a styrenic block copolymer, 20 parts by weight of Zylon 500H (trade name, manufactured by Asahi Kasei Chemicals Corporation) having a heat deformation temperature of 120 ° C. as a polyphenylene ether resin, 100 parts by weight of Christol 70 (trade name, manufactured by Esso Petroleum) as a viscosity modifier, 10 parts by weight of Endex 155 (trade name, manufactured by Eastman Chemical Co.) as a styrene resin, and water as a tackifier resin A hot melt composition of Example 1 was prepared by heating and mixing 40 parts by weight of Alcon P125 (trade name, manufactured by Arakawa Chemical Industries, Ltd.), which is a petroleum resin, with a sigmalide type kneader.

Example 2, Comparative Examples 1-5
Each hot melt composition was prepared in the same manner as in Example 1 with the formulation shown in Table 1. The test evaluation of each hot melt composition was performed by the following method, and are summarized in Table 1.

Melt Viscosity A thermocell system manufactured by Brookfield Co., Ltd. (model: DVI-I +), a thermo controller (model: 75), a thermo container (HT-60DP) and the like was used. The system temperature was set to 210 ° C. and heating was started. 29 spindles were inserted, 20 minutes later, rotation was started at 10 rpm, and measurement was performed after another 20 minutes (60 minutes after the start of heating). Those exceeding 100 Pa · s are unsuitable because the coating workability is poor.

Compressive repulsion force As shown in Fig. 1, the groove of jig A having a width of 5mm and a depth of 6mm (the bottom is a semicircle with a radius of 2.5mm) is filled with the hot melt composition in the groove of jig A having a depth of 50mm. did. A jig B with a width of 2 mm, a height of 30 mm, and a depth of 50 mm as shown in FIG. 2 is inserted into the hot melt filling portion at a crosshead speed of 10 mm / min, and the repulsive force at 50% compression (3 mm). Was measured. Those exceeding 100 N / 5 mm are unsuitable because the assembled member may be deformed by repulsion of the hot melt composition.

Compression set The compression set after 10 days at 80 ° C. was measured in accordance with JISK6262. Those exceeding 90% are unsuitable because they have poor recoverability.

Breaking elongation rate The hot melt composition was cut into a width of 10 mm, a length of 50 mm, and a thickness of 2 mm, and was stretched under the conditions of a span length of 20 mm and a crosshead speed of 500 mm / min, and the elongation at break was measured. Those having an elongation at break of less than 1,000% are not suitable because they break when the hot melt composition is peeled off from the substrate and cannot be easily peeled off.

Using each hot melt composition, the steel plate 1 with a length of 1,000 mm, a width of 500 mm, and a thickness of 2 mm is bent into a L-shaped steel plate with an end of a side of 500 mm in width and 5 mm in a L shape. A side of 500 mm in width of the 2 mm steel plate 2 was joined to the bent portion of the steel plate 1. Steel plates were disassembled by inserting a flathead screwdriver into the connecting part, and workability was evaluated. The case where the whole part was peeled off smoothly from the part peeled off by a flathead screwdriver was evaluated as “good”, and the hot melt composition was cut finely, and the part which could not be disassembled without using a flathead screwdriver was evaluated as “poor”.

  Each hot melt composition of the examples had excellent balance in each property, and thus had excellent heat resistance and dismantling properties. On the other hand, since each hot-melt composition of the comparative example lacks at least one of the performances, the subject of the present application could not be solved.

Top view and side view showing jig A Plan view, front view and side view showing jig B

Claims (3)

  1 to 50 parts by weight of a polyphenylene ether resin having a heat distortion temperature or a glass transition point of 120 ° C. or more, and a viscosity modifier of 30 to 300 with respect to 10 parts by weight of a styrene block copolymer having a number average molecular weight Mn of 100,000 or more. A hot melt composition comprising parts by weight and a styrene resin.   The hot melt composition according to claim 1, wherein the elongation at break is 1,000% or more.   A method for assembling a member using the hot melt composition according to claim 1.

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