JPH048580B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a sheet waterproofing method for building rooftops, etc. using a synthetic polymer waterproof sheet. (Conventional technology) This type of conventional waterproofing method involves applying synthetic polymer waterproofing sheets such as PVC sheets and EPT-butyl rubber sheets to the construction surface such as the rooftop of a building, and placing them on adjacent edges. Polymerize and lay the lap joint part between the sheet polymerization facing surfaces and the polymerization step part with chloroprene type, butyl rubber type, NBR.
It is known to adhesively seal the lap joint by applying primers, adhesives, or sealants such as chlorinated butyl, urethane, or epoxy. (Problems to be Solved by the Invention) The adhesives and sealants used in the conventional waterproofing method described above all have weak adhesion to the synthetic polymer waterproof sheet, causing aging shrinkage of the synthetic polymer waterproof sheet and vibration of the building. , Due to the stress exerted on the wrap joint by the movement, the adhesive or sealant may peel off from the sheet at the wrap joint, and the sheet may shift, creating a water path on the inner step of the sheet overlap, causing rainwater to enter the inside of the waterproof sheet. There is a risk of water entering and causing water leakage. Therefore,
Other waterproofing methods include a method of sandwiching and crimping a non-vulcanized rubber adhesive tape into the wrap joint, and a method of heating and welding the wrap joint using a torch lamp. This is undesirable because it requires time and troublesome effort, and also requires considerable skill. In particular, it is undesirable to perform waterproofing on a surface to be constructed such as a rooftop where there are many places where the end edges of the wrap joints are overlapped, as it requires much more time and effort. (Means for Solving the Problems) In view of the above, the present invention provides a synthetic polymer sheet with a large adhesion force at the lap joint portion of the laid sheet, which is significantly more reliable than conventional sheets, and which also provides aging shrinkage of the sheet. , provides a tarpaulin waterproof construction method that provides stable and robust adhesive seal waterproofing against vibrations and movements on the surface to be constructed. Synthetic polymer waterproof sheets are placed on the surface to be constructed, and the adjacent edges of the waterproof sheets are mutually bonded. It is characterized in that it is polymerized and laid, a silane resin primer is applied between the sheet polymerization facing surfaces of the lap joint part and along the polymerization step part, and aminoxy silicone rubber is applied over the primer and adhesively sealed. (Example) An example of the present invention will be described below. FIGS. 1 and 2 show one example of a waterproofing method according to the present invention. Multiple sheets of EPT-
Polymer synthetic waterproof sheets 2, 2 made of any material with excellent weather resistance such as a butyl rubber sheet or a vinyl chloride resin sheet are sequentially stacked with the edge portions 3, 3 of adjacent sheets 2, 2 overlapping each other. Lay down. At this time, it is no different from the conventional method that each laying sheet 2 is crimped and fixed to the surface 1 to be constructed using any ordinary adhesive 4'. According to the present invention, the facing surfaces 3a, 3a where the edge portions 3, 3 of the sheet 2 overlap, and at least the outer overlapping step portion 5 of the lap joint portion 4 (FIG. 3) formed when the edges overlap. A silane resin primer 6 dissolved in a solvent is applied to an appropriate width on the upper surface 3b of the edge 3 of the lower layer sheet along which at least the edge 3 of the upper layer sheet does not overlap, and a dried primer layer 6 is formed. After drying at room temperature for ~30 minutes, aminoxy silicone rubber 7 is applied to at least one side of the opposing primer layers 6, 6 to a suitable thickness on both sides in the illustrated example. (Figure 1). In this case, the stepped space created along the inner overlapping step 5, that is, between the end surface of the edge 3 of the lower sheet 2 and the lower surface of the upper sheet 2, is filled with aminoxy silicone rubber 7. It is preferable to apply the coating along the end surface. Next, as shown in the second figure, the edge part 3 of the upper layer sheet 2 is overlapped with the edge part 3 of the lower layer sheet 2 and pressed from above. Further, along the outer layered step 5, from the upper surface of the silane resin primer layer 6 applied to the upper surface 3b of the lower sheet 2, from the end surface of the edge 3 of the upper sheet 2 to the upper surface, an appropriate thickness is applied. Apply aminoxy silicone rubber 7 to seal it. After 2 to 6 hours, the silane resin primer 6 and the aminoxy silicone rubber 7 were cured by the reaction, resulting in extremely strong adhesive strength with peel resistance as shown in Table 1 below, and significantly improved adhesion and sealing properties. The waterproof construction according to the present invention is completed with the wrap joints 4 of the end edges 3, 3 of the installed waterproof sheets 2, 2 covered with an adhesive sheet. Preferably, a silane resin primer 6 is applied to the end face of the edge portion 3 of the upper layer sheet 2 and its upper surface before applying the aminoxy silicone rubber 7, thereby providing an even stronger and more stable adhesive seal. is obtained. Although not shown, when applying the above-mentioned aminoxy silicone rubber 7 across the outer polymerized step 5, a coarse reinforcing strip such as a belt-shaped woven fabric tape of an appropriate width is attached across the step 5. It may also be attached to one body. The silane resin primer used in the present invention is mainly prepared by diluting one or more of the following silane coupling agents to 1 to 20% with an organic solvent such as alcohol, MEX, ethyl acetate, or toluene. If desired, about 5% synthetic resin or rubber can be added and dissolved therein. Typical examples of the silane coupling agent used include γ-mercaptopropylmerimethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriethoxysilane, and γ-methacryloxypropyltrimethoxysilane. The aminoxy silicone rubber adhesive and sealant is a type of room temperature vulcanizable silicone rubber, and the vulcanization mechanism is a dehydroxyamine type.
Based on terminal hydroxydimethylsiloxane,
Aminooxy compounds such as diethylhydroxyamine are used as crosslinking agents. Various polymers of the present invention were synthesized using commercially available silane resin primers under the trade name Tos Prime B (manufactured by Toshiba Silicone Co., Ltd.) and aminoxy silicone rubber under the trade names Tosseal 90 and Tosseal 361 (manufactured by Toshiba Silicone Co., Ltd.). Results of measuring the peel strength of the wrap joint of the same sheet using various primers and adhesives used in conventional waterproofing. were as shown in Table 1 below.

[Table] As is clear from Table 1 above, the peel strength of the examples of the present invention is 1.87 to 2.15 Kg/cm, whereas
That of the comparative example is significantly weak at 0.35 to 0.92. (Effects of the Invention) According to the present invention, when performing waterproof construction using a synthetic polymer sheet, the wrap joint portion is adhesively sealed using a silane resin primer and an aminoxy silicone rubber adhesive/sealing material. It has significantly improved peeling resistance compared to the previous model, and can withstand aging shrinkage of the sheet, vibration of the work surface, and stress caused by movement, and effectively prevents peeling of the joint, misalignment, and infiltration of rainwater due to water channels. This method provides highly reliable waterproofing construction, and also has the effect of being easy to construct without requiring the complicated labor required in conventional methods.

[Brief explanation of drawings]

FIGS. 1 and 2 are partial cross-sectional views showing steps of an embodiment of the waterproofing method of the present invention, and FIG. 3 is a partial sectional view showing the steps after waterproofing is completed. 1...Concrete slab construction surface, 2...Polymer synthetic waterproof sheet, 3...Edge of sheet, 3
a, 3a... opposing surface, 3a... non-polymerized upper surface, 4...
... Wrap joint part, 5... Overlap step part, 6...
Silane resin primer, 7...Aminoxy silicone rubber.

Claims (1)

[Claims] 1 Lay synthetic polymer waterproof sheets on the surface to be constructed by polymerizing each other at their adjacent edges, apply a silane resin primer between the sheet polymerization facing surfaces at the lap joint part and along the polymerization steps, and This sheet waterproofing construction method is characterized by applying aminoxy silicone rubber over this primer and adhesively sealing it.