JPH0621505B2 - Asphalt waterproof layer repair method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for repairing an asphalt waterproof layer which has already been constructed for waterproofing a roof of a building.

[Conventional technology and its problems]

2. Description of the Related Art Conventionally, water proofing work using molten asphalt has been widely performed for waterproofing flat roofs of reinforced concrete condominiums, public corporation apartments, etc. because water leakage accidents often occur with mortar and concrete waterproofing. However, the molten asphalt waterproof layer will be damaged immediately when walking on it, or it will not be able to respond adequately to changes in temperature and underground, and will crack, easily leak water and have a short useful life. The repair method of is being carried out.

As a repair method, there is a method of applying molten asphalt after removing both the pressing and the old waterproof layer, or lining a rubber asphalt latex in which asphalt is dispersed in synthetic rubber latex to replace the new asphalt waterproof layer. However, in order to remove the old waterproof layer, it takes a great deal of cost to remove the waste and to treat the residual material, and in the case of molten asphalt, there is a problem of environmental pollution due to the hot air from the kettle and the odor of the asphalt.

As another repair method, a molded sheet made of butyl rubber, soft vinyl chloride, etc. can be glued or heat-sealed on-site.
There is also a construction method in which the layers are connected to form a waterproof layer, but there are water tanks, degassing towers, and various other facilities on the roof. Since the shape is large and the number of joints between the sheets is large, the work is troublesome and the reliability of the joint work is not established, so there is a problem in durability as a waterproof material.

As another repairing method, there is a so-called coating and waterproofing method in which a liquid material is coated with a lining, dried, and made effective to form a uniform waterproof layer. As the liquid material, an aqueous material such as synthetic rubber latex or acrylic rubber emulsion is used alone or together with a filler such as cement, or a resin material such as polyurethane resin is used. Or fine cracks (hair cracks)
Is likely to occur. Polyurethane resin does not adhere well to the underlying asphalt layer, causing swelling or peeling, or the underlying asphalt component elutes to contaminate the surface of the urethane coating waterproof material, or reacts with the polyurethane component due to the underlying moisture to foam. Therefore, it is usually necessary to completely remove the asphalt waterproof layer or to place polymer cement mortar or resin mortar on the underlying asphalt layer to make it the underlying material for the waterproof film. It is laborious and expensive, and it is difficult.

[Means for solving problems]

The present inventors have conducted various studies in order to solve the problem of easily repairing the existing asphalt waterproof layer on the roof of the building, and as a result, found excellent adhesion between the unsaturated polyester resin and the existing asphalt layer. The present invention has been reached.

That is, the present invention is a method for repairing an asphalt waterproof layer, characterized in that an unsaturated polyester resin containing a polymerizable monomer is applied onto an existing asphalt, preferably the unsaturated polyester resin used is a terminal. Contains 1 to 25 mol% of unsaturation with respect to the total amount of dicarboxylic acid, and
The repairing method is characterized by containing less than mol% of unsaturated acid in the chain.

The unsaturated polyester resin used in the present invention can be obtained by condensation and addition reaction of an alcohol compound and a carboxylic acid compound (including an acid anhydride and an alkyl ester compound of carboxylic acid). Those derived from the acid component are preferred. More preferably, 1 is added to the end of the total amount of dicarboxylic acid.
Contains 25 to 25 mol% of an unsaturated acid and does not contain an unsaturated bond in the chain of the unsaturated polyester resin, or even if it is contained, the ratio of the unsaturated carboxylic acid to the total dicarboxylic acid is preferably 8.0 or less. . When the amount of unsaturated acid is more than this range, the elongation of the cured product is remarkably reduced, the rubber elasticity is impaired and the cured product becomes hard, and the adhesive force with the asphalt layer is reduced. In particular, when the amount of the unsaturated acid in the chain is more than 8.0 mol%, the coating film becomes hard at low temperature and loses elongation and becomes brittle.
On the other hand, if the amount is less than the above range, the number of cross-linking points in the unsaturated polyester resin is reduced, gelation is deteriorated, stickiness occurs forever, and the performance of the coating film is not good.

The diol component is mainly composed of dihydroxy compounds, but may partially contain, for example, up to 20 mol% of triol compounds. In this case, for example, by adding the same molar amount of monohydroxy compound, the average functional group is It is appropriate to adjust the radix.

Examples of the dihydroxy compound include ethylene glycol, diethylene glycol, propylene glycol, 1,3 butanediol, 1,4 butanediol, neopentyl glycol and other aliphatic dialcohols, 4,4-dihydroxycyclohexylpropane and other environmental dihydroxy compounds, and bisphenol. Aromatic dihydroxy compounds such as alkylene oxide adducts such as ethylene oxide or propylene oxide of A can be exemplified.

Examples of the polyhydroxy compound include trimethyl rollpupan, glycerin, pentaerythritol and the like.

Examples of the monohydroxy compound include methyl alcohol, ethyl alcohol, isopropyl alcohol, n-
Examples thereof include aliphatic monoalcohols such as butyl alcohol, iso-butyl alcohol, nonyl alcohol, alicyclic monoalcohols such as hexanol, and aromatic monoalcohols such as benzyl alcohol.

The carboxylic acid used as the acid component constituting the carboxy compound includes adipic acid, sebacic acid, phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, 3,6-endomethylenetetrahydrophthalic anhydride, tetrahydrophthalic anhydride, Saturated acids such as hexahydrophthalic anhydride and tetrachlorphthalic anhydride, and unsaturated acids such as maleic anhydride, maleic acid, fumaric acid, mesaconic acid, citraconic acid, itaconic acid, chlorinated maleic acid, acrylic acid and methacrylic acid. Are used alone or in combination of two or more.

The unsaturated polyester resin used in the present invention may contain a copolymerizable polymerizable monomer. Examples of such a monomer include styrene, vinyltoluene, methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, iso-butyl (meth) acrylate, tert.
-Butyl (meth) acrylate, n-octyl (meth)
Acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate (methyl) glycidyl (meth) acrylate, dimethylaminoethyl (meth) acrylate,
Such as diethylaminoethyl (meth) acrylate,
They may be used in one kind or in a combination of two or more kinds, and the use amount thereof is in the range of 0 to 70% by weight depending on the use application such as workability, flexibility, hardness, weather resistance, solvent resistance and dryness. Used in.

A polymer compound, a plasticizer, and a curing catalyst (crosslinking initiator, crosslinking initiation auxiliary agent, etc.) can be added to the polyester resin as needed in order to improve the coating film performance and the curing speed. Polymer compounds that can be used are those that are mixed in order to reduce the manufacturing cost or improve the coating performance or coating performance when used as a coating material, such as acrylic resin, polyester resin, polyurethane resin, styrene. Examples thereof include allyl alcohol copolymer, polyethylene, wax and the like. As the plasticizer, dioctyl phthalate,
Examples thereof include dibutyl phthalate, butyl phthalyl butyl cholate, tricresyl phosphate, and chlorinated paraffin. In addition, bottom residues during petroleum refining such as asphalt and clean products such as coal tar can be added in order to improve coating film performance and improve compatibility with the base.

The curing catalyst added as necessary can be appropriately selected depending on the curing method. A polymerization initiator is not particularly required when high energy such as electron beam is used, but if a light or ultraviolet ray is used, a known photosensitizer is useful as the polymerization initiator, and if heat energy or far infrared ray is used. Suitable polymerization initiators are benzoyl peroxide, methyl ethyl ketone peroxide, ditertiary butyl peroxide, lauroyl peroxide, and peroxides such as cumene hydroperoxide.Metal soaps such as cobalt naphthenate as a polymerization initiator, dimethyl. Suitable are tertiary amines such as aniline, alcoholates such as sodium methylate, lauryl mercaptan, N-ethyl metatoluidine and the like.

The base asphalt layer to be repaired may be constructed by either a thermal method using a hot-melt type or a cold method using a rubber asphalt emulsion. In addition, the asphalt waterproof layer is generally formed by integrally asphalt film and roofing, and these are laminated to provide excellent safety and waterproofness. In case of non-walking, in case of non-walking, in case of non-walking, in case of non-walking, sandproofing etc. Finishing is done with roofing.

When repairing such an asphalt waterproof layer using the above unsaturated polyester resin, in the case of non-walking, only the peeling and blistering parts are partially stripped and repaired, and especially careful groundwork is performed. It can be installed without any work, and in the case of walking, only the waterproof pressing layer can be removed, and the asphalt waterproof layer can be dried before installation.

In the construction, the unsaturated polyester resin can be applied by a usual coating means such as a rubber spatula, a brush, a roller, or other construction equipment, or a spray or other mechanical coating. The coating layer usually cures quickly if left alone.

[Work]

According to the present invention, it is possible to obtain a uniform waterproof coating film which has a fast curing property, which is difficult in the prior art, and which has excellent adhesion to the underlying asphalt layer. This is probably because the polymerizable monomer in the unsaturated polyester resin is very compatible with the asphalt layer, and because the curing is fast, only the asphalt surface layer is integrated with the unsaturated polyester resin. Guessed.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to Examples, Reference Examples and Comparative Examples, but the present invention is not limited thereto. In the following, parts are based on weight, unless otherwise specified.

Reference Example-1 A concrete sidewalk board with a thickness of 5 cm and dimensions of 30 x 30 cm, standard construction specification JASS8 (1981) by the Japan Institute of Architecture, according to A-RC 3 described in Table 8-2-4 of waterproofing work. Shin Kogyo Co., Ltd.
The above primer was applied with a brush at a rate of 0.3 / m ² , and the glass fiber non-woven fabric was pressure-bonded with a perforated roofing material "Eshole" (manufactured by Nissin Kogyo) roller with sand grains,
1.5 kg / m ^{2 of} asphalt “Sigmat L” (manufactured by Nisshin Kogyo Co., Ltd.) melted at 230 ° C. was uniformly applied thereon. Immediately after application, stretch-roofing material "SP Ace" is made by impregnating asphalt into a non-woven fabric composed mainly of vinylon fibers.
(Manufactured by Nissin Kogyo Co., Ltd.) was crimped (Sample-1).

1.0 kg / m ² of molten asphalt was applied to Specimen-1 and pressed by a stretch roofing material with sand “SP Sand” (manufactured by Nisshin Kogyo Co., Ltd.) roller to form an asphalt waterproof layer. This was subjected to a 60-cycle test according to the cycle A of the accelerated aging test specified in ASTM D 529, and used as an asphalt waterproof layer for the following examples.

Reference example-2 Building construction standard specification JASS 8 (1981) by Architectural Institute of Japan
According to A-RB3 described in Table 8-2-2 of waterproofing work, 1.0k of molten asphalt was added to Specimen-1 prepared in Reference Example-1.
g / m ² Evenly applied, and asphalt roofing material "SP Select" (manufactured by Nisshin Kogyo Co., Ltd.) is laminated and melted asphalt 3.
0 kg / m ^{2 was} evenly applied, and gravel was sprayed on the entire surface and embedded with a roller.

The same accelerated aging test as in Reference Example-1 was carried out to obtain an asphalt waterproof layer used in the following examples.

Example-1 1,4 butanediol was added to a four-necked flask equipped with a stirrer, a thermometer, a condenser equipped with a condenser, and a nitrogen inlet tube.
Parts and 6.7 parts of citraconic anhydride were reacted and reacted at a temperature of 120 ° C, then 131.4 parts of adipic acid and 7.0 parts of fumaric acid were added and esterified at 210 ° C in a nitrogen stream, and then 0.05 parts of hydroquinone was melted. A light yellow liquid was obtained by melting 205 parts of styrene. To 100 parts of this pale yellow liquid, 10 parts of calcium carbonate and 5 parts of titanium white were uniformly mixed and dispersed at room temperature under high speed stirring. Just before use, 2.0 parts of benzyl peroxide and 0.
5 parts were mixed and coated on the sand-coated ruffin fin asphalt waterproof layer prepared in Reference Example 1 with a roller to a thickness of 2 mm.

After 3 hours from painting, it was possible to walk, and after curing for 1 week, it had an adhesive force of 5.0 kgf / cm ² or more in the Kenken tensile tester and peeled off the entire asphalt layer.

Also, test specimens created in the same manner as above in water at 20 ° C.
After soaking for 18 hours, leave it at -20 ° C for 3 hours, and then leave it at 50 ° C for 3 hours as one cycle.
After 10 cycles, there was no particular problem in appearance.

Example-2 The gravel-coated asphalt waterproof layer prepared in Reference Example-2 and roller-coated in the same manner as in Example-1 except for the above are capable of walking 3 hours after coating. After curing for a week, 5.0 kgf / cm in the Kenken tensile tester
^It had an adhesive strength of ² or more and peeled off the entire surface of the asphalt layer.

Also, test specimens created in the same manner as above in water at 20 ° C.
After soaking for 18 hours, leave it at -20 ° C for 3 hours, and then leave it at 50 ° C for 3 hours as one cycle.
After 10 cycles, there was no particular problem in appearance.

Example 3 Diethylene glycol was added to a four-necked flask equipped with a stirrer, a thermometer, a condenser equipped with a condenser, and a nitrogen inlet tube.
After charging 3.4 parts and maleic anhydride 3.9 parts and reacting at a temperature of 120 ° C, sebacic acid 173.7 parts and mesaconic acid 13.0
After adding 0.1 part of the mixture and performing an esterification reaction at 210 ° C. in a nitrogen stream, 0.05 part of hydroquinone was dissolved in 268 parts of melted styrene to obtain a pale yellow liquid. Calcium carbonate (10 parts) and titanium white (5) were uniformly mixed and decomposed with 100 parts of this pale yellow liquid at room temperature under high speed stirring. Immediately before use, 2.0 parts of benzyl peroxide, paratoluidine
0.5 parts were compounded, and in the same manner as in Example-1, reference example-
It was applied by a roller to a thickness of 2 mm on the ruffin guasphalt waterproof layer with sand prepared in 1.

After 3 hours from painting, it was possible to walk, and after curing for 1 week, it had an adhesive force of 5.0 kgf / cm ² or more in the Kenken tensile tester and peeled off the entire asphalt layer.

Also, test specimens created in the same manner as above in water at 20 ° C.
After soaking for 18 hours, leave it at -20 ° C for 3 hours, and then leave it at 50 ° C for 3 hours as one cycle.
After 10 cycles, there was no particular problem in appearance.

Example-4 1,4 butanediol 96.3 in a four-necked flask equipped with a stirrer, a thermometer, a condenser equipped with a condenser, and a nitrogen introduction tube.
Parts, 13.4 parts of citraconic anhydride, were reacted at a temperature of 120 ° C., and then 70.1 parts of adipic acid and 46.4 parts of fumar were added and esterified at 210 ° C. in a nitrogen stream, and then 0.05 parts of hydroquinone was melted. Styrene
It was melted to 194 parts to obtain a pale yellow liquid. This pale yellow liquid
To 100 parts, 10 parts of calcium carbonate and 5 parts of titanium white were uniformly mixed and dispersed at room temperature under high speed stirring. Immediately before use, 2.0 parts of benzyl peroxide and 0.5 part of aniline were further mixed and applied on the sandy ruffin guasphalt waterproof layer prepared in Reference Example 1 by a roller to a thickness of 2 mm.

After 3 hours from painting, it was possible to walk, and after curing for 1 week, it had an adhesive force of 5.0 kgf / cm ² or more in the Kenken tensile tester and peeled off the entire asphalt layer.

Also, test specimens created in the same manner as above in water at 20 ° C.
After soaking for 18 hours, leave it at -20 ° C for 3 hours, and then leave it at 50 ° C for 3 hours as one cycle.
After 10 cycles, the coating film and the asphalt layer were partly peeled off, resulting in floating.

Comparative Example-1 100 parts of ALMATEX E365 (manufactured by Mitsui Toatsu Chemicals, acrylic resin emulsion: non-volatile content = 43%), 0.5 parts of BYK053 (manufactured by BYK Chemie) as an antifoaming agent, SN Dispersant 5045 dispersion material (Sannobuco) (Made) 0.3 parts,
A slurry cement paste was obtained by uniformly dispersing and mixing with 100 parts of Portland cement.

This was applied with a rubber spatula to the sandy ruffin guasphalt waterproof layer used in Example 1 so as to have a thickness of 2 mm, and after 24 hours of observation, cracks were found over the entire surface.

Comparative Example-2 Parax E (Mitsui Toatsu Chemicals, urethane coated waterproof material)
A mixture of the main agent and the hardening agent of 1: 2 in a weight ratio of 1: 2 was applied with a rubber spatula to the sandy ruffin guasphalt waterproof layer used in Example-1 so as to have a thickness of 2 mm, and cured for one week. As a result of subsequent observation, asphalt was eluted on the surface and was contaminated, and large blisters were generated in a few places. When the adhesive strength was examined with a Kenken tensile tester 1.
At 0 kgf / cm ² , peeling occurred between the asphalt layer and the urethane layer.

Claims (2)

[Claims] 1. A method for repairing an asphalt waterproof layer, characterized in that an unsaturated polyester resin containing a polymerizable monomer is applied onto existing asphalt. 2. An unsaturated polyester resin containing 1 to 25 mol% of unsaturated acid at the terminal based on the total amount of dicarboxylic acid, and 8 mol% or less of unsaturated acid in the chain. The repairing method according to claim 1.