JP2003206599A - Denatured roofing and construction method for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof construction method and a denatured roofing suitable for it, capable of dispensing with heating, preventing the generation of smoke and malodor, preventing production of released paper waste, and closely fixing a roofing sheet to the bed in a very short time to exhibit perfect water-tightness. <P>SOLUTION: In this denatured roofing and construction method for it, a water absorbing layer is provided on at least one side of a roofing base material. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel modified roofing and its construction method. In particular, the present invention relates to a modified asphalt roofing construction method for obtaining an integrated asphalt waterproof layer without using molten asphalt, and a novel modified asphalt roofing used therefor.

[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 a molten asphalt is flown onto the surface to be waterproofed to form a waterproof layer, In this respect, it still occupies the mainstream of waterproof construction methods. The best point of this construction method is that the asphalt has a low viscosity and excellent flowability during construction, so a high water-tight filling property is obtained, and after the construction, the asphalt is solidified as the asphalt cools and a continuously integrated waterproof layer is easily formed. There is a point to be obtained.

On the other hand, there are a method of forming a waterproof layer by applying a liquid material such as a urethane coating waterproof material, and a method of sticking a waterproof sheet using an adhesive cut back with a solvent. Also, when the reaction curing is completed or the solvent is volatilized, the designed waterproof performance will be exhibited for the first time, and it will not be possible to obtain perfect waterproof performance immediately after construction. This is a construction method I dislike.

The asphalt waterproof thermal method has an extremely excellent waterproof effect, but the method is usually 200
Put ~ 400 kg of asphalt for waterproofing work in a melting pan, melt the blown asphalt for waterproofing work at 250 ~ 300 ℃ with a heating source such as a propane burner, and then put it into a small can that the worker can carry the melted asphalt. This is a method in which asphalt roofing is applied while transferring and transferring with a ladle to form a waterproof layer, and the asphalt dissolution work that normally requires 3 to 6 kg / m ² has to be performed almost all day. 250-300
The reason for melting at a temperature of ℃ is that if the temperature is lower than that, the fluidity of the asphalt is poor and the work for waterproofing is hindered. However, it has been pointed out that various problems such as smoke and odor generated when melting the asphalt are disliked by residents in the neighborhood, ignition of the asphalt, and burns of workers during handling.

Therefore, there is a strong demand for development of an asphalt-based cooling method which does not have these problems. One of the cooling methods is the self-adhesion method of adhering the waterproof layer using the adhesive layer, and this method is becoming well established in the market. Becomes a big problem.

On the other hand, the so-called torch construction method, in which an asphalt roofing sheet is roasted with a torch burner and the coated asphalt layer is melted to adhere the waterproof layer, is gradually becoming widespread, but it requires a fairly high level of construction technology, and especially for joints. Insufficient torching leads to immediate water leakage and leaves us worried at that point.

There is also proposed a method in which an asphalt roofing sheet is drilled on a base such as concrete, mechanically fixed with an anchor plug, and only the joint portion is processed by the torch method, but as described above. It is not a perfect method because it always has anxiety peculiar to the torch method. Further, such a mechanical fixing method requires a considerable amount of time for the work of anchoring to the base concrete, and is not an efficient construction method.

Further, a method of applying an asphalt roofing sheet by using a modified asphalt emulsion obtained by emulsifying and dispersing modified asphalt in water has been proposed. If this method is used, it is not necessary to apply heat, and there is no smoke or bad odor of asphalt, but in order to bond the asphalt roofing sheet to the substrate with sufficient adhesive strength, the water content in the modified asphalt emulsion is It takes time to run out. This not only makes it impossible to work on a windy day, but also has the drawback of significantly poor workability.

[0009]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to adhere a roofing sheet to a substrate in an extremely short time without requiring heating, producing no smoke or malodor, and producing no waste of release paper. The point is to provide a new waterproofing method that can be fixed and exhibit sufficient water tightness, and a modified roofing suitable for it.

[0010]

A first aspect of the present invention relates to a modified roofing having a water absorbing layer on at least one surface of a roofing substrate. The second aspect of the present invention is
The modified roofing according to claim 1, wherein the water absorbing layer is selected from the group consisting of a film layer, a powder layer and a fiber layer. The third aspect of the present invention relates to the modified roofing according to claim 1 or 2, wherein the material forming the water absorbing layer contains a water-soluble and / or water-absorbing polymer. A fourth aspect of the present invention relates to the modified roofing according to any one of claims 1 to 3, wherein the roofing is asphalt roofing. A fifth aspect of the present invention relates to the modified roofing according to claim 4, wherein the water absorbing layer contains a water-soluble and / or water absorbing polymer in an amount of 3% by weight or more, preferably 10% by weight or more. A sixth aspect of the present invention is to provide the modified roofing according to any one of claims 1 to 5 at a stage where the emulsion layer is not dried after the aqueous adhesive emulsion layer is formed on the base, and the water absorbing layer is the aqueous adhesive emulsion layer. The present invention relates to a modified roofing construction method, which is characterized in that it is attached so as to come into contact with the floor. A seventh aspect of the present invention relates to a method for constructing a modified roofing according to claim 6, wherein the modified roofing is that according to claim 4. The eighth aspect of the present invention is
The water-based adhesive emulsion used to form the water-based adhesive emulsion layer comprises 40 to 80 parts by weight of asphalt, 60 to 20 parts by weight of water, 0.01 to 10 parts by weight of an emulsifier, and 10 to 50 parts by weight of a modifier. The present invention relates to a modified roofing construction method according to claim 6.

The water-absorbing layer has a larger surface area in the powder layer or the fiber layer than in the film layer and has an anchor effect, so that the adhesive force is increased. Also, when the water-based adhesive emulsion comes into contact with the powder layer or the fiber layer, moisture is absorbed by the powder or the fiber,
Since the solid content in the emulsion adheres to the surface of the object or fiber, the powder layer or the fiber layer has a higher affinity for the solid content in the emulsion than the film layer, and the water resistance is also higher.
According to the experiment, the water absorption capacity of the water absorption layer is film layer <powder layer <fiber layer, and the weight of the layer is in the order of film layer> powder layer> fiber layer.

When the water absorbing layer is a film-like layer, the layer can be formed in the form of an aqueous solution or dispersion of the aforementioned water-soluble and / or water-absorbing polymer. When the water absorption layer is a powder layer or a film layer, sodium polyacrylate having a polymerization degree of 20,000 to 70,000, particularly 30,000 to 40,000 is preferable among the polymers. When the water-absorbing layer is a fiber layer, water-absorbing polymer fibers alone or various fibers such as polyethylene fibers, polypropylene fibers, polyester fibers, polyamide fibers, polyacrylate fibers, and formalized polyvinyl alcohol fibers are used. It can also be used in the form of blended or blended woven or non-woven fabric. Examples of the water-absorbent polymer fiber include non-formalized polyvinyl alcohol fiber, sodium polyacrylate fiber and the like.

The amount of the water absorbing layer is 50 to 50 in the case of a film layer.
300 g / m ² , preferably 150-250 g / m ² ,
In the case of a powder layer, 50 to 200 g / m ² , preferably 80
Is about 120 g / m ² .

When the water absorbing layer is a fiber layer, 10 to 100 g / m 2 is used when only water-soluble or water absorbing fibers are used.
² , preferably 15 to 40 g / m ² , and 15 to 20 in the case of a non-woven fabric in which water-soluble or super absorbent fibers are mixed.
0 g / ^{m 2,} preferably 20 to 60 g / ^{m 2.}

The water absorbing layer may contain a water-soluble and / or water-absorbing polymer as well as a polymer component having an affinity for the roofing base material. This is particularly effective when the water absorbing layer is used as the film layer. When the roofing base material is an asphalt base material, use an asphalt base material. When the roofing base material is a rubber base material or a vinyl chloride resin, a polymer having an affinity for them, for example, a rubber base material. Is polychloroprene rubber,
Styrene / butadiene rubber (SBR), acrylonitrile / butadiene rubber (NBR), butyl rubber, acrylic rubber, etc. can be used, and in the case of vinyl chloride resin, epoxy resin, acrylic resin, cyanoacrylate, etc. can be used. .

The asphalt-based material may be straight asphalt, blown asphalt, semi-blown asphalt, solvent deasphalted asphalt, and a mixture of two or more thereof. It is also possible to use asphalt in which a small amount of oil such as process oil or lubricating oil, or petroleum resin such as C _{5 to} C ₉ resin is mixed.

When the water absorbing layer is a powder layer or a fiber layer, the water absorbing layer is formed when the roofing base material is in a molten state, and it is possible to form a sufficient layer with only the powder or the fiber. is there. When the water-absorbing layer is a membranous layer, when the water-absorbing or water-soluble polymer has an affinity for the roofing substrate, it can be formed into a layer by any means such as coating using only that. If the amount is insufficient, a component having an affinity for the roofing base material is used in combination with the water-absorbing or water-soluble polymer.

In order to form a membranous layer as a water absorbing layer, in addition to a component having a high affinity with the roofing base material (for example, asphalt in the case of asphalt roofing) and a water-soluble and / or water-absorbing polymer, it is necessary. An emulsifier or modifier may be used in combination depending on the case.

In the present invention, when asphalt roofing is used as a roofing base material and a film-shaped water absorbing layer is formed thereon, (A) (a) asphalt 70 to 97% by weight is added to the base asphalt roofing base material, ( B) Water-soluble and / or water-absorbing polymer 30-
3% by weight and (B) water are added, and (A) :( B) is mixed in a weight ratio of 40:60 to 80:20, and the emulsifier or modifier is added as necessary. It can be produced by applying the aqueous asphalt composition prepared as above to form the water absorbing layer in a film shape.

The water-soluble and / or water-absorbing polymer forming the water absorbing layer is polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl methyl ether, carboxyvinyl polymer, polyacrylic acid and its salts, polyacrylamide, polyethyleneimine, polyethylene oxide, Polystyrene sulfonic acid and its salts, synthetic polymers such as polyamidine, guar gum, locust bean gum, carrageenan, xanthan gum, gum arabic, starch, gelatin, natural polymers such as casein, pullulan, pectin, collagen, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose , Hydroxypropyl cellulose, carboxymethyl cellulose, soluble starch, carboxymethyl starch, alginic acid and its salts, etc. Semi-synthetic polymers and copolymers thereof.

The emulsifier may be cationic, anionic, nonionic or amphoteric, and may be a single component or a multi-component system of two or more types. Examples of the cationic ones include alkylamine salts, alkanolamines, polyethylene polyamines, amine oxide salts, quaternary ammonium salts, and ethylene oxide and / or propylene oxide adducts thereof. In the case of a cationic surfactant which is not a quaternary salt, it can be used in the form of an acid salt of hydrochloric acid, acetic acid, nitric acid, sulfamic acid or dimethylsulfate. As anionic ones, carboxylates, sulfate salts,
Sulfonates, ethylene oxide and / or these
Alternatively, a propylene oxide adduct and the like can be mentioned.
Examples of nonionic compounds include higher alcohol ethylene oxide adducts, alkylphenol ethylene oxide adducts, fatty acid ethylene oxide adducts, polyhydric alcohol fatty acid ester ethylene oxide adducts, higher alkylamine ethylene oxide adducts, fatty acid amide ethylene oxide adducts. , Polyethylene glycol type surfactants such as ethylene oxide adducts of fats and oils, polypropylene glycol ethylene oxide adducts,
And polyhydric alcohol type surfactants such as fatty acid ester of glycerol, fatty acid ester of pentaerythritol, fatty acid ester of sorbitol and sorbitan, fatty acid ester of sucrose, fatty acid amide of alkanolamines. Examples of the zwitterionic compounds include amino acid type and betaine type carboxylates, sulfate ester salts, sulfonate salts, and phosphate esters.

The modifier that can be added to the composition that forms the water absorbing layer for the asphalt substrate is an asphalt modifier, which may be a rubber type or a resin type. Examples of rubber-based materials include natural rubber,
Styrene / butadiene rubber, styrene / isoprene rubber, polyisoprene rubber, butadiene rubber, chloroprene rubber, butyl rubber, chlorinated polyethylene, chlorosulfonated polyethylene, ethylene / propylene rubber, styrene / butadiene block copolymer rubber, styrene / isoprene block copolymer There is rubber etc. Further, examples of the resin type include ethylene / vinyl acetate copolymer, ethylene / acrylate copolymer, polyethylene, polypropylene, vinyl acetate / acrylate copolymer and the like.

When an asphalt base material is used as the adhesive for forming the aqueous adhesive emulsion layer, 40 to 80 parts by weight of asphalt, 60 to 20 parts by weight of water, 0.01 to 10 parts by weight of an emulsifier. And modifier 10
A composition of 50 parts by weight is preferred. As the asphalt, when using asphalt in the water-absorbing layer, it is preferable to use those of the same system as that, it is possible to use any of the emulsifiers and modifiers listed in the section of the water-absorbing layer, but if possible absorb water It is preferable to use the same type as that used for the layer.

When the roofing base material is a rubber type, natural rubber latex, chloroprene rubber latex, styrene-butadiene rubber latex and the like can be used as an aqueous adhesive emulsion, and when the roofing base material is a vinyl chloride type resin. , Vinyl acetate resin emulsion, acrylic emulsion, vinyl acetate-acrylic emulsion, etc. can be used as the aqueous adhesive emulsion.

When only one roofing is applied,
In some cases, two or more sheets may be sequentially installed, and particularly in the case of asphalt roofing, two or more sheets may be sequentially installed. In such a case, the groundwork in the first construction is often a concrete surface or a concrete block surface, but the second and subsequent constructions may be asphalt roofing. In such a case, it is natural that the application of the water-based adhesive emulsion is performed plural times.

In order to make the water-absorbing layer after construction water resistant, it is preferable to incorporate a crosslinking agent for the water-absorbing layer into the aqueous emulsion of the adhesive. When a plurality of roofing base materials are applied as described above, a layer of the crosslinking agent can be formed on the surface opposite to the water absorbing layer. As described below, when using modified roofing having a water-absorbing layer on one side and a layer of a cross-linking agent on the other side, the cross-linking agent may not be added to the aqueous emulsion or may be added in a small amount. it can.

This cross-linking agent is for cross-linking a water-soluble or water-absorbing polymer, and although it may vary depending on the kind of the polymer, a cross-linking agent to be mixed in the asphalt aqueous emulsion at the waterproof construction site. Specific examples include an isocyanate compound, an epoxy compound, an oxazoline compound, and a dihydrad compound. Also [0026]
As described above, as a specific example of the cross-linking agent used for the layer of the cross-linking agent formed on the surface opposite to the water absorption layer, calcium chloride,
Examples include water-soluble inorganic salts such as aluminum chloride, iron chloride, and boric acid.

In the case where one sheet of the modified roofing of the present invention is applied on the substrate, the purpose can be achieved if the water-absorbing layer is provided on only one side. Modified asphalt roofing
When it is necessary to stack multiple sheets, use modified asphalt roofing from 1 to (n-1) sheets from the bottom that have a water-absorbing layer on one or both sides, and attach them one by one using an asphalt aqueous emulsion. Alternatively, only the n-th sheet can be constructed by using a modified asphalt roofing having a water absorbing layer on only one side. When the water absorbing layer is formed on only one surface, the cross-linking agent layer may be formed on the opposite surface.

An example of the construction method of the present invention will be described with reference to FIG. First, as shown in FIG. 1, a water-based adhesive emulsion is applied to the surface of concrete as a base [(a) of FIG. 1]. Then, one of the water in the adhesive aqueous emulsion
The part soaks into the concrete as the base, and the solid content concentration of the aqueous adhesive emulsion increases ((b) of FIG. 1). Then, the roofing of the present invention is attached so that the water absorbing layer is in contact with the surface of the adhesive aqueous emulsion applied [Fig.
(C)]. Then, part of the water in the adhesive aqueous emulsion migrates to the water-absorbing layer, while part of the polymer in the water-absorbing layer migrates to the adhesive aqueous emulsion. The adhesive strength to the base concrete is rapidly improved, and the adhesive strength is such that it cannot be easily peeled off by hand within a few minutes after application [(d) → (e) in FIG. 1]. On the other hand, when the ordinary roofing (without the water-absorbing layer of the present invention) is applied after applying the aqueous adhesive emulsion as in the conventional method, even after about 30 minutes from application, it is considerably It shows only an adhesive force that can be easily peeled off by hand.

The water absorbing layer provided on at least one surface of the roofing base material may be provided on the entire surface of the roofing base material, but by providing a layer in the form of stripes or the like, air permeability is provided between the modified roofing base materials. You can
In this case, the application of the aqueous emulsion of the adhesive may be applied to the entire surface of the base, but by applying the adhesive in a form that substantially matches the shape of the water absorbing layer provided on the modified roofing, the modified roofing and the adhesive Not only the air permeability between the modified roofing layer formed by the aqueous emulsion but also the air permeability between the modified roofing and the concrete of the base can be secured.

[0031]

The present invention will be described below with reference to examples.
The present invention is not limited thereby.

Example 1 As a roofing base material to be a base, from the surface side,
Using a laminate consisting of a mineral material layer / overlay modified asphalt / asphalt-impregnated base material / overlay modified asphalt,
A water-absorbing layer composition described below was applied to the back surface at 500 g / m ² and dried to prepare a single-sided modified asphalt roofing having a water-absorbing layer of 250 g / m ² . <Composition of water absorbing layer> Straight asphalt 45 parts by weight Polyvinyl alcohol (polymerization degree 1200, saponification degree 76) 5 parts by weight Water 50 parts by weight

An asphalt aqueous emulsion having the following composition was applied at 150 g / m ² on a concrete base. <Composition of Asphalt Aqueous Emulsion> Straight asphalt 50 parts by weight Water 50 parts by weight Emulsifier (anionic) 0.2 parts by weight Modifier (SBR latex) 10 parts by weight Then, the modified asphalt roofing has an asphalt absorbing layer thereon. It was attached so as to be in contact with the aqueous emulsion coating layer. As a result, adhesion was achieved that could not be removed by hand after a few minutes.

Example 2 At the stage where the upper asphalt layer on the rear surface side of the same roofing substrate as in Example 1 was in a molten state, sodium polyacrylate (Wako Pure Chemical Industries, Ltd. reagent polymerization degree 3 as water absorbing powder particles was used.
20,000 to 40,000) at a rate of 120 g / m ² to sprinkle a single-sided modified asphalt roofing.

Example 3 At the stage when the upper asphalt layer on the back side of the same roofing substrate as in Example 1 was in a molten state, a water-absorbent fiber nonwoven fabric having the following constitution was laminated to prepare a one-side modified asphalt roofing. <Constituent substances and ratio of water absorbent fiber non-woven fabric> Toyobo Co., Ltd. Water absorbent fiber Lanseal 75% Polyester fiber 25% Total weight 60g / m ²

Comparative Example 1 Polyester fiber 100 as the nonwoven fabric in Example 3
A single-sided modified asphalt roofing was prepared in the same manner as in Example 3 except that the% was used.

Construction example 70 parts by weight of straight asphalt as an asphalt aqueous emulsion, 20 parts by weight of water, anionic emulsifier 2
By weight, a modifier (SBR latex) of 10 parts by weight is used, and 400 g / m ^{2 is applied} to the concrete base.
It was applied and the modified asphalt roofing was applied so that the water absorbing layer was in contact with the asphalt aqueous emulsion. As a result, the initial adhesive strength and water resistant adhesive strength were as shown in Tables 1 and 2.

The measuring conditions of the adhesive force are as follows. Test conditions: 180 ° C peeling strength (20 ° C) Peeling speed: 300 mm / min Base: Slate plate (5 mm thick)

[0039]

[Table 1]

[0040]

[Table 2]

Example 4 A double-sided modified asphalt roofing was prepared by providing the water-absorbing layers used in Example 1 on both front and back surfaces of the roofing base material used as the base in Example 1. Then, the asphalt aqueous emulsion used in Example 1 was applied to a concrete base in the same manner as in Example 1, and then the double-sided modified asphalt roofing was applied. After a few minutes, the asphalt aqueous emulsion used in Example 1 was applied onto the aforesaid double-sided modified asphalt roofing, followed by the single-sided modified asphalt roofing prepared in Example 1. As a result, the waterproof construction was completed by a two-layer asphalt roofing having adhesive strength that could not be removed by hand after a few minutes.

[0042]

EFFECTS OF THE INVENTION (1) According to the present invention, it is possible to provide a novel roofing which enables quick construction of a waterproof sheet at room temperature without using heat. (2) The method of the present invention can provide a waterproof construction method that does not use heat, emits no smoke or bad odor, does not generate a release sheet, and fully utilizes the characteristics of asphalt roofing. (3) According to the method of the present invention, since it takes a very short time for the roofing to adhere to the substrate, the construction work can be carried out quickly and accurately with little influence of the weather. (4) By changing the form of the water-absorbing layer to a film layer, a powder layer, or a fiber layer, the amount of water-absorbing layer used per unit area for roofing is reduced in this order within the required water-absorbing performance range. be able to. (5) The surface area of the film layer, the powder layer, and the fiber layer increases in this order to increase the water absorption rate, and the solid content in the aqueous emulsion of the adhesive surrounds each water absorption layer, and the water resistance increases in this order.

[Brief description of drawings]

FIG. 1 is a process diagram for conceptually explaining a construction method of the present invention.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuhiro Abe             Le Tajima 1-3-1, Kodai, Adachi-ku, Tokyo             In the roofing company (72) Inventor Toru Kojima             Le Tajima 1-3-1, Kodai, Adachi-ku, Tokyo             In the roofing company (72) Inventor Takashi Ito             Le Tajima 1-3-1, Kodai, Adachi-ku, Tokyo             In the roofing company F term (reference) 4F100 AJ20 AJ20A AJ20B AK01B                       AK21 AR00B AT00A BA02                       BA07 DE01B DG01B DG11B                       GB07 JB09B JD15B YY00B

Claims (8)

[Claims] 1. A modified roofing having a water absorbing layer on at least one surface of a roofing base material. 2. The modified roofing according to claim 1, wherein the water absorbing layer is selected from the group consisting of a film layer, a powder layer and a fiber layer. 3. The modified roofing according to claim 1 or 2, wherein the material forming the water absorbing layer contains a water-soluble and / or water-absorbing polymer. 4. The modified roofing according to claim 1, wherein the roofing is asphalt roofing. 5. The modified roofing according to claim 4, wherein the water absorbing layer contains a water-soluble and / or water-absorbing polymer in an amount of 3% by weight or more. 6. After forming an aqueous adhesive emulsion layer on a substrate, the water-absorbing layer is in contact with the modified adhesive roofing layer according to any one of claims 1 to 5 at a stage where the emulsion layer is not dried. A modified roofing construction method that is characterized in that 7. The method of applying a modified roofing according to claim 6, wherein the modified roofing is that according to claim 4. 8. The aqueous adhesive emulsion used to form the aqueous adhesive emulsion layer comprises 40 to 80 parts by weight of asphalt, 60 to 20 parts by weight of water, and an emulsifier of 0.0.
The modified roofing construction method according to claim 6, which comprises 1 to 10 parts by weight and a modifier to 10 to 50 parts by weight.