JPH10204414A - Outdoor wall sealing agent composition and outdoor wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a outdoor wall sealing agent composition that contains a specific wax, prevents the sealing agent and interlayer paper from blocking, and is hard to separate from the outdoor wall. SOLUTION: This outdoor wall sealing agent composition comprises a wax that contains, as main components, 15-35wt.% of (A) a thermoplastic elastomer, such as styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, or a hydrogenated product of these block copolymers, 20-40wt.% of (B) a tackifier, and 20-40wt.% of (C) crystalline polypropylene having number-average molecular weight of 20,000 or less, and 5-20wt.% of (D) hydrocarbon-based liquid plasticizers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-melt sealing agent for use in pre-sealing a lap joint portion of an outer wall material having a lap joint portion, which is produced in a factory, and further relates to the sealing agent. The present invention relates to a building material manufacturing technique.

[0002]

2. Description of the Related Art In the construction of buildings, a method of manufacturing outer wall panels and the like in a factory and attaching them at a building site has been widely adopted. When manufacturing an outer wall material used in such a construction method, pre-sealing using a hot melt adhesive is performed on a lap joint portion of the outer wall material. As a sealing agent used for the pre-sealing, an adhesive type having elasticity is generally used because it has sufficient sealing properties when lap jointed. However, the adhesive type hot melt adhesive has problems such as blocking with the slip sheet and adhesion of dust. To solve the problem, studies have been conducted to eliminate surface tackiness, but it has been sufficiently improved. Nothing has been found. On the other hand, in terms of elasticity, hot melt adhesives having very good elasticity have been studied and used. However, when the outer wall material is applied, the pre-sealing agent is compressed to nearly 50%. The pre-sealing agent made of an adhesive has a high compressive strength, which causes problems such as difficulty in constructing the outer wall material and causing warpage, floating, and cracking of the outer wall material. A method of mechanically mixing an inert gas in a molten state with an inert gas and discharging the same from a nozzle in a foamed state to form a sealing agent has been studied. However, also in this method, the adhesive force of the foamed sealing agent is reduced, especially in summer, so that the sealing agent may fall off from the outer wall material by being rubbed when the outer wall materials are overlapped, or after applying the sealing agent, Since the slip sheet is sandwiched between the outer wall material and immediately packed, the sealing agent and the slip sheet cause blocking, causing problems such as peeling of the sealing agent when the slip sheet is removed.

[0003]

SUMMARY OF THE INVENTION The present invention is intended to prevent blocking between a sealing agent and a slip sheet during the production of an outer wall material produced in a factory and having a sealing agent at a lap joint, and to prevent the summer season from occurring. It is an object of the present invention to provide a sealing agent which is hardly peeled off from the outer wall material even when the outer wall material is applied.

[0004]

Means for Solving the Problems The present inventors use a specific wax as a hot melt sealing agent of a known composition comprising a thermoplastic elastomer, a tackifier, a wax and a liquid hydrocarbon plasticizer. When,
An excellent sealing agent can be obtained, and an outer wall material pre-sealed as a foamed hot melt sealing agent using an inert gas mixing machine using the sealing agent has excellent performance as an outer wall material and an outer wall panel. Thus, the present invention was completed. That is, the present invention provides a sealing agent composition for an outer wall material comprising a thermoplastic elastomer, a tackifier, a wax and a plasticizer as main components, wherein the wax is a crystalline polypropylene having a number average molecular weight of 20,000 or less, and the amount is a composition. Medium 20-40
The present invention also relates to a sealing agent composition for an outer wall material, wherein the content of the component (A) is 15 to 35% by weight, and the content of the component (B) is 15 to 35% by weight. ) 20 to 40% by weight of component (C), 20 to 40% by weight of component (C) and 5 to 20% by weight of component (D). Component (A): styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, or a hydrogenated product of these block copolymers. Component (B): tackifier. Component (C): a wax composed mainly of crystalline polypropylene having a number average molecular weight of 20,000 or less. Component (D): a liquid hydrocarbon-based plasticizer. Further, the present invention relates to an outer wall material, wherein the foamed sealing agent composition for an outer wall material is used as a sealing agent for a lap joint portion.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail. [Component (A): Thermoplastic Elastomer] As the thermoplastic elastomer used in the present invention, styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer or hydrogen of these block copolymers is used. Additives, which are generally respectively SIS (styrene-isoprene-styrene), SB
S (styrene-butadiene-styrene) and SEBS
(Styrene-ethylene-butylene-styrene) or S
It is called an EPS (styrene-ethylene-propylene-styrene) thermoplastic elastomer, and is a tertiary block copolymer represented by XYX. Where X is a terminal block of styrene and Y is a rubber phase intermediate block;
The rubber phase midblock is polyisoprene, polybutadiene or a hydrogenated product thereof. The number average molecular weight of the block of these copolymers is 2,000 for the styrene block.
0-125,000, rubber phase middle block is 10,000
Copolymers having a weight of .about.250,000 and a weight of styrene block in the range of about 10-50 wt% based on the total weight of the copolymer are preferred for the present invention. Commercially available products such as these include, for example, in the SIS system, Kariflex TR-1107 and Kariflex TR-1 manufactured by Shell Chemical Co., Ltd.
111, Califlex TR-1112, Califlex TR-1117, and the like. For the SBS system, Kariflex TR-110 also manufactured by Shell Chemical Co., Ltd.
1, SEBS (S
(EPS) -based products such as Clayton G-1650, Clayton G-1652, Clayton G-1657, and Clayton G-1726 manufactured by Kuraray Co., Ltd.
2, Septon 2003, Septon 2043, Septon 2
063 and the like. In particular, those of SEBS and SEPS are excellent in thermal stability and are preferable for the present invention.
If the amount of the component (A) is less than 15% by weight of the composition, the elasticity of the cured product may be reduced, and the sealing property may not be sufficiently exhibited. Decrease.

[Component (B): Tackifier] Examples of the tackifier used in the present invention include known rosin-based, terpene-based and petroleum resin-based ones. Specific examples of the rosin-based tackifier include natural rosin, polymerized rosin, and derivatives thereof (modified rosin and its water additive, methanol ester, glycerin ester, pentaerythritol ester, and their water additives). Commercially available products include gum rosin, wood rosin, ester gum A, ester gum H, Hercules of Arakawa Chemical Industries, Ltd.
Pencel A, Pencel C, Foral 85, Foral 105, Hentalin C, and the like. Terpene resins include polyterpene resins, terpene phenol resins and their water additives. Commercially available products include YS Resin A-11 manufactured by Yashara Chemical Co., Ltd.
5, YS resin To-105, YS polystar T-11
5, YS Polystar 2130, Clearon P-115,
Clearon M-125 and the like. Further, the petroleum resin styrene, alpha-methyl styrene, vinyl toluene, indene, aliphatic petroleum resin aromatic petroleum resin and the like methyl indene, the C ₅ fraction as a main material, cyclopentadiene-based petroleum resin, Examples thereof include aliphatic / aromatic or aliphatic / alicyclic copolymer-based petroleum resins and hydrogenated petroleum resins obtained by hydrogenating them. Commercially available products include Escolets 2101 of Tonex Corporation and Zeon Corporation. Quinton C-100, Arakawa Chemical Industries, Ltd. Alcon P-
90, Archon P-115, Archon M-100, Pico Pico Pale 110SF, Goodyear Wing Tack 95, Wing Tack 115, Mitsui Petrochemical Co., Ltd.
Petrozine # 100, Petrozine # 120, Maruzetsu H-800, Maruzetsu H-
790 and the like. These tackifiers serve to increase the adhesiveness to the outer wall material, and preferred for the present invention are petroleum resin-based resins and hydrogenated petroleum resins. It is also preferable that the balance of compatibility, heat stability, color tone, cohesive strength, and the like of each component in the sealing agent composition is maintained by using not only a single compound but also a combination of two or more compounds. The compounding amount of the tackifier is preferably 20 to 40% by weight or less. If the compounding amount is less than 20% by weight, sufficient adhesive performance cannot be obtained, and if it exceeds 40% by weight, the cohesive force of the sealing agent is reduced, and as a result, the adhesive force, heat resistance and flexibility are reduced, and furthermore, the interleaving paper and , And the object of the present invention cannot be achieved.

[Component (C): Crystalline polypropylene having a number average molecular weight of 20,000 or less] In the present invention, the wax increases the fluidity and non-adhesiveness of the sealing composition at the time of melting by heating, and has a cohesive strength at room temperature. And adjust the softening point. Number average molecular weight 20,000
The following crystalline polypropylene is a powdery polypropylene obtained by decomposing a propylene polymer or isotactic polypropylene, and commercially available products such as Viscol 330P (number-average molecular weight 15,000, R
& B softening point 152 ° C), Viscol 550P (number average molecular weight 4,000, R & B softening point 150 ° C), Biscol 66
0P (number average molecular weight 3,000, R & B softening point 145
° C), Viscol TS-200 (number average molecular weight 3,50
0, R & B softening point 145 ° C) (All are Sanyo Chemical Industries, Ltd.)
Manufactured). The degree of crystallinity of polypropylene is JIS-K-7122 (method of measuring heat of transition of plastic)
Can be evaluated by the heat of crystallization measured by the differential scanning calorimetry defined in
0P is a polypropylene having a heat of crystallization of 19.8 Kcal / g, and Viscol 550P is a polypropylene having a heat of crystallization of 24.9 Kcal / g. In addition, amorphous polypropylene, which will be described later, has almost no heat of crystallization. By using the above-mentioned crystalline polypropylene, a sealing agent composition having excellent adhesive heat resistance to the outer wall material and excellent fluidity during heating and melting can be obtained. The use of crystalline polypropylene having a molecular weight of 1,000 to 5,000 provides a more remarkably excellent sealing agent composition, so that the present invention is particularly advantageous in using such polypropylene. preferable. The blending amount of the polypropylene in the composition of the present invention is preferably 20% by weight to 40% by weight. If the amount is less than 20% by weight, a problem of blocking properties with the slip sheet occurs, and sufficient cohesive force and heat resistance cannot be obtained, and the fluidity at the time of melting is insufficient. The composition may be less flexible and lose cold resistance. When the above-mentioned crystalline polypropylene is employed in the present invention, a part thereof is an amorphous atactic polypropylene separated as a by-product of isotactic polypropylene, such as Vistalon (R & B softening point of 125 ° C. to 155 ° C.).
Chiba Fine Chemical), Vistack L (R & B softening point 5)
0 ° C to 60 ° C Chiba Fine Chemical) and the like, and amorphous polyalphaolefins such as propylene and ethylene,
It is a low molecular weight amorphous polymer obtained by copolymerizing butene-1 and hexene. It can be replaced with Ube Tack 2304, Ube Tac 2115 of Ube Lexen Co., Ltd., and East Bond M-5F of Eastman as commercial products. However, if the substitution rate is set to 70% by weight or more of the crystalline polypropylene, the characteristics of the crystalline polypropylene are lost. It is also possible to use a polypropylene in which another monomer is copolymerized as long as the crystallinity of the crystalline polypropylene is not impaired. In addition, crystalline polypropylene and other waxes, such as paraffin wax,
It is also possible to use a microwax and a low-molecular-weight polyethylene in combination within a range that does not impair the features of the invention.

[Component (D): Liquid Hydrocarbon Plasticizer] The liquid hydrocarbon plasticizer used in the present invention is a paraffinic, naphthenic, or aromatic, generally referred to as a synthetic rubber bulking oil or process oil. There are liquid hydrocarbon-based synthetic rubbers such as group-hydrocarbon petroleum-based high-boiling fractions and liquid resins such as liquid rosin and liquid terpene, and polybutene, polyisobutylene, polyisoprene, polybutadiene, and hydrogenated products thereof. Commercially available process oils include Shellflex (Shell Chemical Co., Ltd.), Diana Process Oil (Idemitsu Kosan Co., Ltd.), Daimalon, YS Oil (Yasuhara Chemical Co., Ltd.), liquid paraffin, etc. Synthetic rubbers include Klaprene LIR (Kuraray Co., Ltd.), Idemitsu Polybutene (Idemitsu Petrochemical Co., Ltd.), and Nisseki Polybutene (Nippon Petrochemical Co., Ltd.). These liquid hydrocarbon plasticizers can be used alone or in combination of several kinds. These liquid hydrocarbon plasticizers
It is used for the flexibility of the adhesive, the adhesion to the outer wall panel, the reduction of the melt viscosity, and the improvement of the fluidity at the time of melt coating. The compounding amount of the liquid hydrocarbon-based plasticizer in the composition of the present invention is preferably 5% by weight to 20% by weight. 5% by weight
If it is less than 10, the flexibility of the sealant composition is reduced, and the cold resistance is lost. In addition, fluidity at the time of melting is insufficient, while
If the amount exceeds 20 parts by weight, the cohesive force of the sealing agent composition decreases, and heat resistance is impaired.

[Other components] Further, a filler, an antioxidant, an ultraviolet ray inhibitor and the like can be used in combination as an additive in the sealing composition of the present invention. Examples of fillers are talc, silica, calcium carbonate, carbon black,
There are zinc white, titanium oxide, inorganic pigments, etc., each of which prevents liquid dripping and improves yarn breakage during melt coating, improves the thermal stability of the sealing composition during heating and melting, imparts thixotropic properties, coloring, etc. Used for the purpose. Antioxidants are used to protect against thermal oxidation during heating and melting, and UV inhibitors are used to protect against ozone and ultraviolet rays.
It is preferable to use it by adding in the range of weight%.

[Characteristics of Sealing Agent Composition] The sealing agent composition of the present invention can be obtained by the above-mentioned constitution. However, considering the suitable viscosity of the melt-foaming device, the sealing agent has a melt viscosity of 150-150. 100 at 200 ° C
Those that fall within the range of 0 to 20000 cps (centipoise) are preferable. Also, the softening point of the sealing composition (R & B formula)
Is preferably 110 ° C. or higher. Softening point is 11
If the temperature is less than 0 ° C., when exposed to a high-temperature environment, poor adhesion is likely to occur in the sealing portion even with extremely weak stress.
Further, the solidification of the sealing agent is slow in the manufacturing process, and blocking with the slip sheet occurs, which is not preferable. The above softening point (R
& B formula) is measured according to JIS-K-6863 (Testing method for softening point of hot melt adhesive).

[Method for Preparing Sealing Agent] The sealing agent of the present invention is preferably used at 140 ° C. or higher, preferably in a nitrogen stream.
A method in which the components constituting the composition are simultaneously or sequentially dissolved and mixed by rotating a stirring blade in a melting tank called a heating-type melting and stirring tank at a temperature of 50 ° C. or lower, and sharing under heating with a twin-engine rotating blade called a kneader. Any of the methods used in the production of ordinary hot melt adhesives, such as a method in which each component is simultaneously or sequentially charged and kneaded, or a method in which the mixture is melted and mixed under heating with a single or twin screw in an extruder. Manufacture is possible by the method.

[Applying Method of Sealing Agent] External wall materials to which the sealing agent of the present invention is applied include gypsum board, mortar board, hard wood chip cement board, metal board and the like, and the surface is usually painted for decoration. Applies to As an application method, a device capable of mechanically mixing a non-flammable gas in a molten state with a hot melt sealing agent, applying the mixture through a nozzle, and forming the sealing agent into a foamed bead is used. Melt applicator FM-151 or the like can be used. As a discharge condition of the applicator, it is preferable that the application temperature be 160 ° C. or more and 220 ° C. or less. Application temperature is 160
If the temperature is lower than 0 ° C., the melting of the hot melt sealing agent becomes difficult, and the dischargeability deteriorates. On the other hand, when the temperature is 220 ° C. or higher, the heating temperature is high, and the heating stability of the hot melt sealing agent deteriorates, which is not preferable. The higher the expansion ratio of the sealing agent, the more preferable it is because the sealing agent has elasticity. However, it is usually preferable to perform the expansion at about 2.5 to 4 times. When the expansion ratio is less than 2.5 times, sufficient elasticity cannot be obtained and there is a high possibility that the workability cannot be improved by foaming. On the other hand, when the expansion ratio exceeds 4 times, the degree of foaming becomes uneven, There is a possibility that the coating properties such as a non-uniform bead width may be deteriorated, and also a problem may occur in terms of the apparatus.

[0013]

EXAMPLES The present invention will be specifically described below based on examples and comparative examples. In addition, the evaluation method of the adhesive obtained in each example was performed by the following method. a. Compatibility Upon melting at 190 ° C., the presence or absence of separation was visually observed. b. Melt Viscosity According to JIS-K-6862, the melt viscosity was measured at 190 ° C. with a B-type rotational viscometer. c. R & B Softening Point Measured according to JIS-K-6863 (Testing method for softening point of hot melt adhesive). d-1. Adhesion (adhesion) A sealing agent was applied in a bead shape to a substrate at 23 ° C. After leaving the coated product at 23 ° C. for 24 hours, a part of the bead was peeled off, a hook was hooked, and the 90 ° peel strength was measured at 23 ° C. using a digital spring alone. Similarly, the 90 ° peel strength was measured also in an environment at 60 ° C. d-2. Adhesion (lateral strike-slip resistance / workability) A sealing agent was applied in a bead shape to a substrate at 23 ° C. After leaving the coated product at 23 ° C. for 24 hours, the bead was observed under a 23 ° C. environment with a load of 100 g from the side of the bead. ：: No peeling, no shift ×: Peeling, no shift Similarly, evaluation was performed at 5 ° C. after being left at 5 ° C. for 24 hours, and further evaluated at 60 ° C. after being left at 60 ° C. for 24 hours. Was. e. Blocking strength After coating on a substrate at 60 ° C., open time 15 seconds, PE
A film (20 μm) was placed thereon and crimped under a load of 10 gf / bead. After leaving at 23 ° C. for 24 hours, the 90 ° peel strength at 23 ° C. was measured. Similarly, after leaving for 24 hours at 60 ° C, 2
The 90 ° peel strength at 3 ° C. was measured. f. Application conditions FM-151 which is a hot melt applicator for foaming
The evaluation was performed using a mold (manufactured by Nordson Corporation). The foaming conditions were as follows.

(1) Examples 1-4 and Comparative Examples 1-3 2.5 kg of Kraton G-1652 and 2.5 kg of Alcon P-115 were placed in a kneader heated to 170 ° C. under a nitrogen stream.
kg, 100gr of Irganox 1010, Tinuvin 32
7 was charged in an amount of 100 gr and melt-mixed for about 30 minutes. next,
1 kg of process oil PW380 was charged and melt-mixed for about 30 minutes. After confirming that the mixture is sufficiently mixed, add 4 kg of Viscole 660P, melt and mix for about 1 hour.
After defoaming in a heating state at 170 ° C. under reduced pressure for 0 minute, it was extracted to obtain a sealing agent. Table 1 shows the results of the evaluation by the above-described evaluation method together with the composition as Example 1. Examples 2 to 4 and Comparative Examples 1 to 3 were similarly melt-mixed,
The results were evaluated and shown in Table 1. As is clear from Table 1, in Examples 1 to 4, good performance was obtained, but Comparative Examples 1 to 4.
In No. 3, no satisfactory performance was obtained.

[0015]

[Table 1]

Details of the components in Table 1 are as follows. * 1 Clayton G-1652: SEBS block copolymer
(Manufactured by Shell Chemical) * 2 Archon P-115: hydrogenated petroleum resin (manufactured by Arakawa Chemical) * 3 Viscole 660P: low molecular weight polypropylene (manufactured by Sanyo Chemical) * 4 Microwax # 155: microwax (Nippon Oil Co., Ltd.) * 5) Diana Process Oil PW-380: Process Oil
(Idemitsu Kosan) * 6 Irganox 1010: Antioxidant (Ciba-Geigy) * 7 Tinuvin 327: Ultraviolet absorber (Ciba-Geigy)

[0017]

According to the sealing composition of the present invention,
It showed good adhesion to the outer wall panel, and was easy to work at high temperatures. In addition, since it was improved so as not to cause blocking even in the case of packing in a short time, troubles such as peeling of the sealing agent when peeling the slip sheet were eliminated, and workability was remarkably improved.

Claims (3)

[Claims] 1. A sealant composition for an outer wall material comprising a thermoplastic elastomer, a tackifier, a wax and a plasticizer as main components, wherein the wax has a number average molecular weight of 20,000.
The following crystalline polypropylene, wherein the amount thereof is 20 to 40% by weight of the composition. 2. The composition contains the following four components, each containing 15 to 35% by weight of the component (A), 20 to 40% by weight of the component (B), 20 to 40% by weight of the component (C) and (D). Ingredients 5-20
A sealing agent composition for an outer wall material, which is contained by weight. Component (A): styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, or a hydrogenated product of these block copolymers. Component (B): tackifier. Component (C): a wax composed mainly of crystalline polypropylene having a number average molecular weight of 20,000 or less. Component (D): a liquid hydrocarbon-based plasticizer. 3. An outer wall material, wherein the foamed outer wall material sealing agent composition according to claim 1 or 2 is used as a sealing agent for a lap joint portion.