JPH0255473B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a pre-sealing material for architectural exterior wall materials that is applied to lap joints during the manufacturing process of the exterior wall materials in order to save the labor of finishing joints at construction sites. As buildings become prefabricated and unitized, the traditional earth wall finishing or cement mortar finish is being replaced by unitized walls, which are fitted with external wall panels manufactured in factories. Conventionally, pre-sealing materials used for unitizing exterior wall materials include solvent-based materials, reaction-curing materials, foam tapes, adhesive hot melts, and the like. Solvent-based pre-sealing materials have disadvantages in the odor of the solvent in the drying process, toxicity, fire danger, thinning of the meat due to volatilization of residual solvent, and weather resistance. Reaction-curing pre-sealing materials not only have a large difference in reaction rate and degree of foaming depending on weather conditions such as temperature and humidity, but also are complicated to handle. On the other hand, when foam tape is used as a pre-sealing material, there are disadvantages such as high price and poor workability and productivity. Compared to these pre-sealing materials, hot-melt pre-sealing materials can be said to be superior in that they generally do not have the above-mentioned defects. In general, as a property required of a hot melt type pre-sealing material, it is essential to maintain watertightness in the wall materials by adhering or adhering the wall materials forming the joint. For this reason, conventional hot-melt pre-sealing materials require long-term adhesion or adhesion that can sufficiently withstand changes in temperature and humidity due to seasonal changes in climate, as well as wall material stretching, warping, and distortion due to rainwater, etc. It was said that In other words, conventional pre-sealing materials need to exhibit adhesion or stickiness even when cold, and if the wall material stretches, warps, or warps, it will cause tension on the wall material that is in close contact with the adhesive or adhesive. By deforming and following the above-mentioned elongation, warpage, or distortion, watertightness is ensured. From this point of view, among hot-melt pre-sealing materials, adhesive-type ones usually have a difficult point in terms of their properties as a sealant because their adhesive layer is hard and difficult to deform. For this reason, adhesive hot melt pre-sealing materials have been mainly used as hot-melt pre-sealing materials for lap joints. However, conventional adhesive hot melt pre-sealing materials also have the following various problems due to their tackiness when cold. In other words, even if a small amount of dirt or dust adheres to the surface, its adhesion will be extremely reduced, making it impossible to expect watertightness between wall materials, and during storage or work in warehouses or construction sites. Large dirt and pebbles tend to adhere to the exterior wall materials, and in this case too, there are defects that can cause distortion in the joint gaps and impair watertightness, and there are problems with transportation of the exterior wall materials during the manufacturing process or on-site construction. If the adhesive hot melt pre-sealant sticks to the carrier's hands or gloves and peels off from the wall surface, it may become unusable as an exterior wall material or it may be necessary to apply another sealant. When cutting the exterior wall material in order to attach it to the area where the canopy has entered, pre-sealing material may adhere to the cutting machine.
The pre-sealing material may become difficult to cut, and sometimes the pre-sealing material may be partially peeled off by the blade, and when adjusting the position before fixing the wall surface, if it is sticky, it will be difficult to correct the position. The pre-sealing material adheres to the other wall material that makes up the wrap joint and tends to peel off from that wall material, and the powdery debris of the exterior wall material adheres to the surface where the pre-sealing material is applied, causing problems. etc. Conventional adhesive hot melt pre-sealing materials have had many problems as described above. Therefore, in this industry, we have the necessary followability,
Moreover, there was a strong desire for a hot melt type pre-sealing material that solved the problems of the previous period. The inventors have conducted extensive research to meet these demands. As a result, the inventors determined that in order to give a pre-sealing material conformability, it should be based on elasticity rather than adhesiveness, and that a hot-melt pre-sealing material that has adhesiveness only when necessary. For example, it has been found that the above requirements can be satisfied. In other words, hot-melt pre-sealing materials contain a thermoplastic elastomer, a specific tackifier, a specific plasticizer, and wax in a specific ratio, so that the temperature and humidity changes due to the four seasons of the wall material can be avoided. It has elasticity that can follow elongation, warping, and distortion due to water and rainwater, and can ensure watertightness.Furthermore, it exhibits tackiness when hot melted, but does not show surface tackiness when cold, and only sticks when necessary. We found that each of them has the following properties. This invention was completed based on such knowledge. Therefore, the present invention provides adhesives selected from thermoplastic elastomers, rosin resins, polyterpene resins, coumaron indene resins, aliphatic hydrocarbon resins, alicyclic hydrocarbon resins, and aromatic hydrocarbon resins. Contains a plasticizer selected from paraffinic, naphthenic, and aromatic oils, and the blending ratio is 20 to 50 parts by weight of thermoplastic elastomer, 10 to 40 parts by weight of tackifier, and plasticizer. 10~40
Wax is added to the composition in a blending ratio of 5 to 20 parts by weight, which is selected within the range of parts by weight, and has elasticity and exhibits tackiness when melted hot, but when cold. The subject matter is a pre-sealing material for wrap joints of external wall materials for construction, which is characterized by not exhibiting surface tackiness. The addition of wax in hot melt adhesives has heretofore been limited to achieving the following objectives: (1) Improving fluidity by reducing viscosity (2) Accelerating solidification rate (3) Increasing hardness However, in this invention, the wax is used for purposes rather than for the purposes (1) to (3) above. , is added for the following purposes. That is, a composition containing a thermoplastic elastomer, the specific tackifier, and the specific plasticizer in a blending ratio within the specific range is used as the base material of the hot melt adhesive, and wax is added to the composition in the specific range. This is to obtain a good hot melt pre-sealing material that has elasticity and exhibits tackiness only when necessary, by adding it in a blending ratio within this range. As a result, since the pre-sealing material of the present invention contains the specific tackifier in a blending ratio within the specific range, it exhibits tackiness when melted during use, and can be used for wall materials, base materials, etc. Since the wax is added at a mixing ratio within the specified range, the surface does not show stickiness when not in use or when solidified, that is, when it is cold. This prevents dirt and dust from adhering to the wall material, prevents it from peeling off from the wall material due to adhesion to other objects, and makes it easy to adjust the position of the wall material. Therefore, even when the wall material expands/contracts, warps, or distorts, it deforms while remaining in close contact with the wall material due to its elasticity.This allows it to follow the expansion/contraction, warp, or distortion and ensure watertightness. . One guideline for the elasticity is, for example, an elasticity with a compression set of 10% or less. In this invention, the blending ratio of the main components is 20 to 50 parts by weight of thermoplastic elastomer and 10 parts by weight of tackifier.
~40 parts by weight, 10 to 40 parts by weight of plasticizer, and 5 to 20 parts by weight of wax. Typical thermoplastic elastomers in this invention include styrene-isoprene block copolymer,
It is a styrene-butadiene block copolymer,
Ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate, amorphous polypropylene, etc., which have been conventionally used in hot melt adhesives, are soft but have little elasticity and have a large compression set, so they are not suitable for the purpose of this invention. However, the addition of small amounts does not cause any problems. The tackifier is usually a well-known rosin resin, polyterpene resin, coumaron indene resin, aliphatic hydrocarbon resin, alicyclic hydrocarbon resin, aromatic hydrocarbon resin, etc. In order to reduce stickiness, it is desirable to use a small amount, but if it is too small, the adhesion to the substrate will deteriorate, causing problems. As the plasticizer, commonly known paraffinic, naphthenic, or aromatic oils can be used. As the wax, paraffin wax, microcrystalline wax, polyethylene wax, etc. can be used, and each of these components may be used alone or as a mixture of two or more. Incidentally, the hot melt pre-sealing material obtained using these may contain an ultraviolet absorber, an antioxidant such as an antioxidant, and other additives, if necessary. The present invention will be explained in more detail below by presenting Examples thereof together with Comparative Examples. Examples and Comparative Examples Styrene-isoprene-styrene block copolymer (Califlex TR-1107: Ciel Chemical Co., Ltd. product) was used as the thermoplastic elastomer, and a terpene polymer (polyterpene resin) was used as the tackifier.
(YS Resin Px800: a product of Yasushi Oil Industries Co., Ltd.), naphthenic process oil (Cielflex 371: a product of Ciel Chemical Co., Ltd.) as a plasticizer, and paraffin wax 135 (Nippon Oil Co., Ltd.) as a wax. product) and pentaerythrityl as an anti-aging agent.
Tetrakis [3-(3,5-di-tert-butyl-
4-Hydroxyphenyl)propionate] (Irganox 1010, a product of Ciba-Geigy), and the pre-sealing material for lap joints according to the present invention (2) and paraffin were blended as shown in Table 1. Regarding Comparative Example () which does not contain a wax component, each component was uniformly mixed and melted, and a 20 mm cubic specimen with a side of 20 mm was prepared from a cooled and molded block, and the compression set of each specimen was measured. The results are shown in Table 1, and after compressing the sample to half its original thickness and keeping it for 100 hours, it recovered to nearly its original thickness, that is, it exhibited elasticity. . Next, each of the same compositions was melted and coated onto a polyester film to a thickness of 100 μm. As with the comparative examples, the examples had no abnormalities in adhesion, and the desired coating was possible. After the coating film had cooled, high-quality paper was layered on top of it and bonded by strong pressure with a hand roller. Then, each was peeled off and the peel strength was examined, and the results were as shown in Table 1. It can be said that the pre-sealing material of the example had substantially no tackiness even when strongly pressed, and the high-quality paper was easily peeled off. Therefore, the products of the Examples are susceptible to small or large dirt or dust adhering to the surface, adhesion to the hands or gloves of the carrier, adhesion to the cutting machine during cutting, and difficulty in positioning. Problems such as easy adhesion to the other party's building materials are less likely to occur. On the other hand, the comparative examples have extremely strong adhesiveness, and these problems are very likely to occur. Furthermore, the results of examining the weather resistance of each are shown in Table 1, and there were no problems with the examples.

[Table] The method of measuring the characteristics is as follows. (1) Compression set: JISK-6301-8 (conditions: 50%
(100 hours compression, temperature 20℃) (2) Peel strength: According to JISZ-1524. Polyester (100μm)/high quality paper 25mm width, temperature 20℃,
Peeling speed 300mm/min (3) Weather resistance: Shimadzu weather tester/CW-
PV use Example () and Comparative Example () were subjected to the following water leakage test to examine their waterproof sealing properties. i.e. inner diameter with opening 1 of 880mm x 840mm at the bottom
A tank 2 measuring 1000 mm x 1000 mm was covered with three outer wall boards 4 (coated with waterproof paint) using a crosspiece 3 as a base to cover the opening. A pre-sealing material 5 of the example or comparative example was applied between the matching joints of the adjacent exterior wall boards 4, 4, and putty 6 was applied to prevent water leakage in other gaps. Then, water was filled to a depth (h) of 100 mm, 300 mm, and 500 mm, and each was left for one week to check for water leakage.
There was no water leakage in both the Example and the Comparative Example, and the test was passed. That is, the pre-sealing material of the example, which had almost no tackiness, exhibited waterproof sealing properties equivalent to that of the comparative example, which had very high tackiness. These results show that the adhesion of pre-sealing materials to building materials does not need to be ensured by adhesion when cold, but can be ensured by elasticity, and that adhesion is ensured by elasticity. It can be seen that tackiness when cold is unnecessary if Therefore, according to the present invention, the adverse effects caused by tackiness when cold can be eliminated, and watertightness can be ensured. As mentioned above, the pre-sealing material for wrap joints of architectural exterior wall materials according to the present invention has appropriate permanent set elasticity and exhibits tackiness when hot melted but does not show surface tackiness when cold. be.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a side sectional view and a plan view of the water leakage testing device. 1... Opening, 2... Tank, 4... External wall board, 5
...Pre-sealing material, 6...putty.

Claims (1)

[Claims] 1 Thermoplastic elastomer, tackifier selected from rosin resin, polyterpene resin, coumaron indene resin, aliphatic hydrocarbon resin, alicyclic hydrocarbon resin, aromatic hydrocarbon resin, and paraffin Contains a plasticizer selected from oils such as oils, naphthenes, and aromatic oils, with a blending ratio of 20 to 50 parts by weight of thermoplastic elastomer and 10 to 10 parts by weight of tackifier.
40 parts by weight and a plasticizer selected within the range of 10 to 40 parts by weight, wax is added at a blending ratio of 5 to 20 parts by weight, and has elasticity and has elasticity when hot melted. A pre-sealing material for lap joints of architectural exterior wall materials, which exhibits tackiness but does not show surface tackiness when cold.