JPH10292570A - Sealant for waterproof sheet and waterproofing method therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make waterproofing work easy by a method wherein a thermoplastic resin bag is filled with a specified improved asphalt composition for sealing waterproof sheet and thereby sealant for waterproof sheet is made up, and the sealant is formed in a barlike, beltlike or cordlike shape. SOLUTION: A thermoplastic resin bag is filled with a waterproof sheet sealing improved asphalt composition, for which melt viscosity at 100 deg.C is 5,000-100,000 centipoise, low temperature folding endurance is 0 deg.C or below and softening point is 90 deg.C or above. Sealant for waterproof sheet made up by being filled with the asphalt composition is formed in a barlike, beltlike or cordlike shape. Then, the sealant is dipped in 100 deg.C hot water and after the sealant is warmed up to 100 deg.C, a caulking gun is loaded with the sealant and the sealant is supplied to joints of waterproof sheets and thereby the waterproof sheets are joined together. Thermoplastic resin forming the thermoplastic resin bag is such that is not melted at the temperature whereat the asphalt composition is melted and enables the bag to be blown up inside the caulking gun to discharge the asphalt composition. Accordingly, environmental pollution caused by fumes, offensive odor and the like can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sealing material for a waterproof sheet and a waterproofing method using the same.

[0002]

2. Description of the Related Art The so-called asphalt waterproofing thermal construction method, in which asphalt is melted at a construction site and a plurality of asphalt roofings are laminated while flowing the molten asphalt over a surface to be waterproofed to form a waterproof layer, is a point of the waterproof reliability. It still occupies the mainstream of waterproofing methods. The most excellent point of this method is that asphalt has low viscosity and excellent fluidity at the time of construction, so high watertight filling property is obtained, and it is easy to form a continuous and integrated waterproof layer after cooling asphalt after construction It is in the point obtained.

On the other hand, there are a method of applying a liquid material to form a waterproof layer such as a urethane coating waterproof material, and a method of applying a waterproof sheet using an adhesive cut back with a solvent. Also, the waterproofing performance designed only after the reaction hardening is completed or the solvent evaporates is exhibited, and the complete waterproofing performance is not obtained immediately after the construction, but it is a construction method that dislikes rainfall immediately after the construction.

[0004] The asphalt waterproofing thermal method has a very excellent waterproofing effect, but the method is generally used for 200 years.
Put into a dissolving pan capable of dissolving ~ 400 kg of waterproofing asphalt, dissolve the waterproofing blown asphalt at 250 ~ 300 ° C with a heating source such as a propane burner, and then into a small can where the worker can carry the dissolved asphalt This is a method of forming a waterproof layer by attaching asphalt roofing while transferring and pouring with a ladle, and the asphalt dissolving operation which usually requires 3 to 6 kg / m ² has to be performed almost all day. 250-300
The reason for dissolving at a temperature of ° C. is that if the temperature is lower than that, the asphalt has poor fluidity, which hinders waterproofing work. However, various problems have been pointed out, such as the smoke and smell generated when melting asphalt is disliked by local residents, the ignition of asphalt and the burns of workers during handling.

[0005] Therefore, there is a strong demand for the development of an asphalt cooling method which does not have these problems. One of the cooling methods is a self-adhesion method in which a waterproof layer is bonded using an adhesive layer, and this method is becoming quite popular in the market. Becomes a big problem.

On the other hand, a so-called torch construction method in which an asphalt roofing sheet is roasted with a torch burner, and a coated asphalt layer is melted to adhere a waterproof layer has been gradually spreading. Insufficient torching will lead to immediate water leakage, leaving concerns in that respect.

A method has also been proposed in which an asphalt roofing sheet is drilled and drilled in a base such as concrete, and then mechanically fixed with an anchor plug, and only a joint portion is processed by a torch method. The anxiety peculiar to the torch method is an inherent method and cannot be said to be complete. Further, such a mechanical fixing method requires a considerable amount of time for anchoring to the foundation concrete, and is not an efficient construction method.

[0008]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a novel waterproof sheet sealing material and the use thereof.
An object of the present invention is to provide a waterproofing method that does not generate waste materials, can quickly perform highly reliable waterproofing work, and does not pollute the surrounding environment due to smoke and odor.

[0009]

SUMMARY OF THE INVENTION The first aspect of the present invention is to provide a 100
A modified asphalt composition for waterproof sheet sealing having a melt viscosity at 5,000 to 100,000 centipoise, a low-temperature folding resistance of 0 ° C. or less, and a softening point of 90 ° C. or more was filled in a thermoplastic resin bag. The present invention relates to a sealing material for a waterproof sheet.

In a second aspect of the present invention, the sealing material for a waterproof sheet according to claim 1 or 2 is immersed in hot water at 100 ° C., and after the sealing material for the waterproof sheet reaches 100 ° C., is loaded into a caulking gun. Supply to the joint part of the waterproof sheet,
The present invention relates to a waterproofing method characterized by joining a waterproof sheet.

The thermoplastic resin bag preferably has a stick-like (sausage-like, column-like or square-column-like), band-like or string-like shape when filled with the waterproofing sheet-like sealing composition. .

The thermoplastic resin forming the thermoplastic resin bag does not melt depending on the temperature of the molten modified asphalt composition for sealing a waterproof sheet, and the modified asphalt composition for sealing a waterproof sheet. Can maintain a safe strength even if it is held by hand in a molten state in a bag, and expels the modified asphalt composition for waterproof sheet sealing by bursting in a caulking gun. For example, polyvinylidene chloride, vinylidene chloride resin such as vinylidene chloride-vinyl chloride copolymer, polyethylene,
Examples thereof include polyolefins such as polypropylene, styrene-butadiene copolymers (such as SBR), and styrene-butadiene block copolymers.

The modified asphalt composition for sealing a waterproof sheet has a melt viscosity at 100.degree.
000 centipoise, preferably 5,000 to 3
000 centipoise, particularly preferably 5,000
~ 15,000 centipoise, low temperature folding resistance is 0 ° C or less,
Preferably, it has a softening point of 90 ° C or higher, more preferably 100 ° C or higher.

Further, the modified asphalt composition for sealing a waterproof sheet has a melting temperature of 90 to 100.degree.
It is preferable that the odor concentration at about 100 ° C. and the smoke density at 100 ° C. are about 0.

By the way, in the case of conventional asphalt for waterproofing work, it is used after being melted at a temperature of 200 to 300 ° C. The melt viscosity at this time is several hundred to several tens centipoise,
The odor concentration is 2 to 10 times or more that of the product of the present invention, and the smoke concentration is 2 to 10 times or more of the product of the present invention.

The melt viscosity was measured using a BH type viscometer.

In the method for measuring the low-temperature folding resistance, a sealing material is formed into a sheet having a thickness of 1 mm, wound around a steel rod having a diameter of 5 mm at a speed of 2 seconds, and indicated by a temperature at which cracks do not occur on the surface.

The softening point is measured according to JIS K 2
207 Petroleum asphalt compliant.

The measurement of the odor concentration was carried out using an XP-329 general-purpose odor sensor (manufactured by New Cosmos Electric).

The measurement of the smoke density is carried out according to JIS A13.
In accordance with the surface test described in No. 21 (flame retardancy test method for building interior materials and construction methods), the amount of smoke generated was measured using a smoke collection box and a light amount measuring device.

In order that the sealing material can be easily applied at a temperature of 100 ° C., the sealing material easily shows a fluid state when an external force is applied at the temperature, which is a so-called thixotropic property. There is a need. Then, the heat resistance required for the sealing material after the application is at least 70 to 80 [deg.] C., and it is necessary that the sealing material does not become brittle even at a low temperature. In order to satisfy the required performance as described above, it is extremely effective to mix the following additives with straight asphalt. (A) In the case of imparting a remarkable thixotropy at around 100 ° C. and imparting the property of not sagging at high temperatures, low molecular weight polyolefins and petroleum resins, particularly low molecular weight polyethylene and polypropylene (so-called wax) are preferable. Although these resins are extremely hard and have a high softening point, they are suitable because they have a characteristic that the fluidity is rapidly improved at a temperature higher than the softening point. (B) In the case of imparting a property that is not easily embrittled even at a low temperature It is preferable to add a thermoplastic elastomer. For example, E
VA, SBS, SEBS, SEPS can be used and cost
SBS is particularly preferred from the viewpoint of the effect. For example, the modified asphalt composition used in the present invention is a composition comprising 1 to 10% by weight of an elastomer, 5 to 20% by weight of a wax, and 70 to 94% by weight of a straight asphalt.

As the caulking gun, a commercially available cartridge type filling gun can be used.

The waterproof sheet used in the waterproofing method of the present invention is not particularly limited as long as it has an affinity for the modified asphalt composition for sealing a waterproof sheet. However, from the viewpoint of eliminating waste materials caused by release paper and avoiding the generation of smoke and odor due to the thermal method, Japanese Patent Application Nos. 6-235857 and 6-2 of the present applicant.
It is preferable to adopt a waterproof sheet that does not generate waste material according to a technique such as 85809 or a technique similar thereto, especially a waterproof sheet and a waterproofing method using a contact-type adhesive.

The waterproof sheet is disclosed in Japanese Patent Application No. 6-23 / 1990.
What is described in 5857 specification is preferable. This waterproof sheet is a laminate composed of an anti-blocking layer, an asphalt layer, a base layer, an asphalt layer, a cushion layer, a plastic film layer, and a contact-type adhesive layer that are provided as necessary, in order from the top.

The anti-blocking layer may be a plastic layer or a rubber layer having no affinity with the contact type adhesive, or may be a layer of fine particles such as mineral powder.

As the plastic layer or rubber layer, films such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, saponified product thereof, polystyrene, polyethylene terephthalate, polyvinyl alcohol, polyamide, polybutadiene, styrene-butadiene copolymer and the like can be used. Although mention may be made, polyethylene, polypropylene and polyethylene terephthalate are generally preferred because they have no affinity for ordinary contact adhesives and exhibit antiblocking properties.

When a plastic layer or a rubber layer is used as the anti-blocking layer, an anchor coat layer may be provided, a corona discharge treatment, or a corona discharge treatment may be performed to ensure the adhesion between the anti-blocking layer and the asphalt layer. It is preferable to improve the adhesion by providing an anchor coat layer after the treatment.

As the coating material used for the anchor coat layer, a material having affinity and adhesion to both the blocking layer and the asphalt layer, such as a urethane paint, is selectively used.

Further, when the waterproof sheet is directly exposed to sunlight, the adhesiveness is reduced by ultraviolet rays. Therefore, an ultraviolet ray inhibitor, especially a dark colorant, particularly carbon black, is added to the anchor coat layer. It is preferable to mix them, but a dark pigment such as a red pigment can sufficiently fulfill the role. Mineral powder or plastic beads can be used as the fine particles. As the synthetic resin paint, polyurethane, polyester, polyamide, acrylic resin, a copolymer of ethylene and vinyl acetate, and the like can be used. Silica, silica sand, mica, clay, alumina and the like are used as the fine powder of mineral matter. Any plastic beads such as polystyrene can be used as the plastic beads. Their particle size is generally between 0.05 and
Particles having a particle diameter of about 0.3 mm are preferred.

As the asphalt used for the asphalt layer, any asphalt such as blown asphalt and various modified asphalts can be used.

As a material constituting the base layer, one or more woven fabrics and / or nonwoven fabrics obtained by mixing or mixing inorganic fibers such as natural and / or synthetic fibers and glass fibers can be used. Of course, the base material is in a state where molten asphalt seeps from above and below.

The cushion layer is not particularly limited as long as it is a soft and well-fitted layer. A slightly more specific example may be an adhesive layer or a foam layer. Due to the presence of this layer, even when the underlying concrete has a considerably rough surface, the contact type adhesive layer can be sufficiently blended with the underlying surface without increasing the layer thickness, and a good adhesion state can be maintained.

The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer can be employed as long as it has high alkali-water resistance among general-purpose pressure-sensitive adhesives prepared using synthetic resin, synthetic rubber, natural rubber, recycled rubber, or the like as a main raw material. . Since the present invention relates to an asphalt waterproofing method, an adhesive obtained by adding the above-mentioned synthetic polymer substance to asphalt is desirable. As a specific example of the adhesive, the following composition can be obtained. SBS (styrene-butadiene-styrene-block copolymer) 10-30 parts by weight, especially 20 parts by weight Petroleum resin (tackifier) 5-20 parts by weight, especially 10 parts by weight Asphalt 30-70 parts by weight, especially 40 parts by weight Process Oil 10 to 40 parts by weight, especially 30 parts by weight The coating thickness of the adhesive is set in consideration of the cushion effect. What is necessary is just about 0.3-1.0 mm.

Examples of the material constituting the foam layer include polyurethane, polyethylene, polypropylene, cross-linked polyethylene, cross-linked polypropylene, and natural or synthetic rubber.

Examples of the plastic film constituting the plastic film layer include polyolefin films such as polyethylene and polypropylene, acrylic resin films, ethylene-vinyl acetate copolymer films, polyester films such as polyethylene terephthalate, polyamide films, polybutadiene. Films and styrene-butadiene copolymer films can be used.

The contact-type adhesive has a risk that the low-molecular substance in the asphalt is likely to block on the surface of the anti-blocking layer when rolled because the low-molecular substance in the asphalt migrates through the cushion layer. A plastic film layer is required to prevent the migration of the film.

In order to improve the adhesion between the plastic film layer and the contact type adhesive layer, the film surface is usually subjected to a corona discharge treatment. However, depending on the type of the contact type adhesive, an anchor coat layer may be required. is there.

The contact type adhesive was manufactured on May 1, 1969.
5th Published by Kobunshi Kanbun Kaisha, edited by Koichi Nishimoto, “Glossary of Wood Adhesion Dictionary”, an adhesive that adheres when acupressure is applied, and then cures as time passes. The adhesive is composed of a natural rubber and a synthetic rubber, and the main component of the adhesive is an adhesive composed of natural rubber and synthetic rubber. The adhesive handbook (second edition), published by Nikkan Kogyo Shimbun, Jan. 10, 1982, No. 325 It is described in detail on page 343. Here, chloroprene rubber, nitrile-butadiene rubber, and styrene-butadiene rubber are particularly preferable, and chloroprene rubber, of which adhesion, crystallinity, and molecular weight can be easily controlled, is particularly preferable. The contact adhesive layer is usually used as a layer having a thickness of 1 to 200 μm, preferably 1 to 50 μm.

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto.

Example 1 "Part 1" shows the layer structure of the waterproof sheet used in this example, "Part 2" shows the composition of the two types of contact adhesives used in this example, and "Part 3" Shows a method of bonding the waterproof sheet to the substrate with the contact adhesive,
“Part 4” shows an embodiment in which the joint portion is sealed using the sealing material for a waterproof sheet, which is a feature of the present invention.

Part 1 (Layer Structure of Waterproof Sheet) As the waterproof sheet, a waterproof sheet having the following laminated structure which does not generate waste material and does not generate odor or smoke in the bonding work to the frame is used. Anti-blocking layer [Polyethylene terephthalate (PET) 12 µm and biaxially oriented polypropylene 15 µm
A laminated film made of PET is used on the upper side] or No. 6 silica sand powder layer Asphalt layer: SBS (Shell Chemical TR-1101) 15% by weight Straight asphalt 180-200 85% by weight. Substrate layer: A polyester spun bond of 120 g / m ² was used. Asphalt layer: SBS (Shell Chemical TR-1101) 15% by weight Straight asphalt 180-200 85% by weight. Cushion layer: SBS * ¹ 20% by weight Petroleum resin * ² 10% by weight Asphalt 40% by weight Process oil 30% by weight A layer having a thickness of 0.5 mm. * ¹ : SBS is a styrene-butadiene block copolymer. * ^2; petroleum resin C ₅ and / or unsaturated fractions of the polymer or copolymer of C _9. Plastic film layer: Biaxially oriented polypropylene (20 μm) coated with polyurethane-based paint 1 g / m ² is used.

No. 2 (Composition of Contact Type Adhesive) Two types of contact type adhesives (the following composition shows a ratio as a solid content) are shown in the following a) and b). a) When chloropropylene rubber is used Neoprene AC (trade name) 60 parts by weight Neoprene W (trade name) 40 parts by weight MgO 4 parts by weight ZnO 5 parts by weight Nocrack PA (trade name of antioxidant) 2 parts by weight Alkyl phenol Resin (tackifier) 50 parts by weight b) When nitrile-butadiene rubber is used Hiker 1042 (trade name) 100 parts by weight Coumarone indene resin 35 parts by weight

Part 3 (Method of Using Contact-Type Adhesive) Each of the above-mentioned contact-type adhesives is applied as a solution having a solid content of 25% to a base of 0.3 kg / m ² , dried, and dried. The waterproof sheet was adhered so that the ends thereof were sequentially overlapped.

Part 4 (adhesion of joint part) Filling capacity 1.6 kg, thickness (diameter 7 cm), length 35 c
m sausage bag filled with a sealing material consisting of 4 wt% of SBS, 8 wt% of PE wax, 82 wt% of straight asphalt, and 6 wt% of other additives, put in an 18 liter can filled with water, and use a propane burner. The water was heated to boiling, and after the sealing material reached 100 ° C., it was loaded into a cartridge-type caulking gun, and the joint made in the above “No. 3” was immediately sealed. The amount of the modified asphalt composition for sealing a waterproof sheet of the present invention is 1 k per 5 cm joint width.
g / m ² . After the sealing material was cooled, the joint was inspected, and good watertightness was obtained.

[0045]

【effect】

(1) According to the present invention, a completely new type of sealing material for a waterproof sheet can be provided. (2) According to the waterproofing method in which the waterproofing sheet sealing material and the waterproofing sheet that does not generate release paper are used in combination, no waste material is generated, and no smoke or bad odor is generated. Waterproofing work can be performed. (3) The waterproofing method of the present invention can achieve the melting of the modified asphalt composition for waterproof sheet sealing using hot water, so that the heating means is relatively safe, and the melting at the construction site can be easily performed. And economical.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // B29L 7:00 (72) Inventor Masaru Nishikawa 1-3-1, Kodai, Adachi-ku, Tokyo Inside Tajima Roofing Co., Ltd. 72) Inventor Toru Kojima 1-3-1 Kodai, Adachi-ku, Tokyo Inside Tajima Roofing Co., Ltd. (72) Inventor Takashi Ito 1-3-1 Kodai, Adachi-ku, Tokyo Inside Tajima Roofing Co., Ltd.

Claims (3)

[Claims] 1. A melt viscosity at 100 ° C. of 5,000
For a waterproof sheet, characterized in that a modified asphalt composition for sealing a waterproof sheet having a low temperature folding resistance of 0 ° C. or less and a softening point of 90 ° C. or more is filled in a thermoplastic resin bag. Sealing material. 2. The waterproofing sheet sealing material according to claim 1, wherein the waterproofing sheet sealing material has a rod shape, a band shape or a string shape. 3. The sealing material for a waterproof sheet according to claim 1 or 2 is immersed in hot water at 100 ° C., and after the sealing material for a waterproof sheet reaches 100 ° C., is loaded into a caulking gun.
A waterproofing method characterized in that the waterproofing sheet is supplied to a joint part of the waterproof sheet and the waterproof sheet is joined.