JPS5887361A - Fusion of water-proof sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for welding a waterproof sheet used in rooftop waterproofing methods for flat roofs and the like. More specifically, it relates to a welding method for repairing waterproof sheath F, which has already been constructed and has become obsolete.

Synthetic polymer roofing materials comply with JIS A6008 and J
As specified in IS A6009, it has been used as a rooftop waterproofing material for a long time, but waterproofing layers that have been used for more than 10 years have deteriorated considerably, causing cracks, tears, or cracks in the joints in places, resulting in water leakage accidents. The condition M is likely to occur. However, such defects do not occur over the entire surface of the waterproof layer, but rather occur in areas where distortions in the building or due to thermal expansion and contraction are concentrated, so it is necessary to repair only those areas of the waterproof layer. It can be said that it is possible to extend the lifespan by an additional 3 to 5 years5.

However, the surface of an aging waterproof layer, where such deterioration is progressing, is often hardened, and in the case of a soft vinyl chloride waterproof sheet, the plasticizer component is volatilized and lost, and a considerable amount of the plasticizer component is lost. It has a rough surface. Therefore, it is extremely difficult to cover and repair such a surface with a new waterproof sheet, and as a result, it is difficult to repair the surface with a simple and easy repair method such as urethane waterproofing. When applying urethane coating, the physical properties are fl! l! In addition, the adhesion and pickling properties of the urethane coating film to the surface of deteriorated old vinyl chloride sheets are not very good, which causes the coating film to come up again within a short period of time, causing water leakage accidents. becomes.

The present invention has been made in view of the current situation, and an example of its implementation will be described with reference to a drawing. A thermoplastic synthetic resin bath liquid with excellent permeability and adhesion is applied to the surface of an already installed waterproof sheet (1). After applying 2) and sufficiently drying, apply another waterproof sheet (3) and heat and soften the coated film surface and the back side of the contact waterproof sheet with hot air such as Hot Jet 0. This is a method for forming a waterproof sheet by thermally welding the membrane surface and the back surface of the softened sheet (4).

The already installed waterproof sheet (1) in the present invention is a thermoplastic synthetic resin coating water sheet such as a soft vinyl chloride resin system or a 1ilVA system, and is an old and connected waterproof sheet, and is used as a waterproof sheet for a concrete frame (A). Even though the adhesive layer (B) is attached on top, there are no holes or gaps due to cracks or tears.

The thermoplastic synthetic resin coating (2) with excellent permeability and adhesion used in the present invention is an amorphous linear saturated l
Suitable coating films include polyester resin, such as Bylon 200 and Pylon 300 manufactured by Toyobo. In addition to these linear saturated polyester resins, vinyl acetate-vinyl chloride copolymers, vinyl acetate-vinyl chloride copolymers containing carboxyl groups (e.g. Vinyly>WjCH resin),
Resins such as heat-activated acrylic resins and vinyl chloride-vinylidene chloride copolymers can also be effectively used. However, in terms of welding strength, the above-mentioned linear saturated polyester resin is most preferred.

Vylon 200 is compatible with various thermoplastic synthetic 111jk, and the heat weldability can be further improved by adding, for example, the above-mentioned VMCH, xylene resin, sucrose benzoate, etc., and the welding strength is higher than that of reactive urethane. Resin (e.g. Dainippon Ink Coronae L, etc.)
It can be further improved by using in combination.

Byron 200 is MgK,) luene, penzol.

It is soluble in common solvents such as methylene chloride and ethyl acetate, and is used in the form of a solution with a solid content of approximately 20-50% in the present invention.

When applying to an old waterproof sheet, first wipe off any dirt on the area with methanol or the like before application. Next, a 20-50% solution of the above-mentioned Pylon 200 is applied with a hair brush or the like at a register of about 100-20Of/1. The area to be coated should be slightly wider than the area of the welded part. After drying for 10-20 minutes to completely volatilize the solvent in the solution, cut a new waterproof sheet to a standard size) (3
) on top of the coating film @ 1 With the tarpaulin sheet lifted as shown in Figure 1, blow the back side of the tarpaulin sheet and the surface of the coating film with Hotsushijet 0 hot air (J to melt and soften it, and at the same time press it with a pressure roller or by hand. Hot weld 511
Part (4) is completely integrated, creating a watertight structure, and the Vylon layer exhibits excellent adhesion with the old waterproof sheet, and is completely heat-fused with the new waterproof sheet (3).
1 (4), so there is no fear of peeling.

Resins other than Vylon 200 can be thermally welded using almost the same method.

However, it is of course important to be at ease by selecting the hot jet temperature according to the type of resin used. ) can be welded to provide even greater watertightness and stronger welding strength.

In addition, the method of the present invention can be applied not only to repairing old waterproof sheets, but also to jointing new waterproof sheets. It is also possible to use a bathing suit with a waterproof sheath and an EVA waterproof sheet. Furthermore, since it can be applied on an existing vulcanized rubber sheet layer by using a ply beak, it can also be used for repairing rubber waterproof sheets.

[Brief explanation of drawings]

The drawings show an example of the method of welding a waterproof sheet according to the present invention. FIG. 1 is a cross-sectional view of a state in which thermal welding is performed, and FIG. 2 is a cross-sectional view of a state before thermal welding. ) is a waterproof sheet, (2) is 11 painted surfaces, (3) is a contact waterproof sheet), (
4) is the heat welded part, ■ is the hot air O

Claims (3)

[Claims] (1) After applying a thermoplastic synthetic resin coating film with excellent permeability and adhesion to the surface of the existing waterproofing sheet and drying it thoroughly, the coated surface and the contacting waterproofing sheet are brought into contact with another waterproofing sheet. A welding method for a waterproof sheet, characterized by heating and softening the back side of the sheet with hot air from a hot compressor, etc., and at the same time thermally welding the softened coating surface and the back side of the softened sheet. (2) The method for welding a waterproof sheet according to item 1 above, wherein the already constructed waterproof sheet is an aged thermoplastic synthetic resin waterproof sheet. (3) The method for welding a waterproof sheet as described in item 1 above, wherein the thermoplastic synthetic resin having excellent permeability and adhesion is a linear saturated polyester resin made of amorphous threads.