JPH0345681A - Sheet waterproofing and repairing - Google Patents

Abstract

PURPOSE:To improve adhesive properties, base resistance and water resistance by adhering an existing sheet made of an ethylene-propylene terpolymer with a repair sheet made of PVC or an ethylene-propylene terpolymer by using a specified adhesive. CONSTITUTION:100 pts.wt. (hereinbelow described as pts.) urethane-modified epoxy resin (i), 20-150 pts. adhesiveness imparting agent (ii) for ethylene.propylene terpolymer(EPT), 10-200 pts. curing agent (iii) and, if necessary, 20-80 pts. epoxidized natural rubber and 20-100 pts. tackifier (iv) are compounded as a two-pack type contg. either component (i) or (iii) in each pack to obtain an adhesive (c). After at least one of an existing sheet (a) made of EPT and a repair sheet (b) made of PVC or EPT is coated with the component (c), the component (a) is adhered to the component (b).

Description

[Detailed description of the invention]

<Industrial Application Field> The present invention applies to existing ethylene-propylene terpolymer C
Polyvinyl chloride (hereinafter referred to as PVC) is applied to the entire surface C1 or a portion of the waterproof sheet (hereinafter referred to as EPT).
The present invention relates to a sheet waterproofing repair method in which repairs are carried out by adhering a repair waterproofing sheet made of or EPTI. <Conventional technology> EPT sheets are used by adhering them to concrete as rooftop waterproof sheets, etc., but conventionally, chlorobrene-based solvent-based adhesives were used to bond the EPT sheets and cocrete. . However, the EPT sheet constructed in this way cracks due to the influence of the underlying concrete, adhesive, or the outside air, and such cracks in the EPT sheet can cause rainwater to leak through the eyes or the seams between sheets. There were times when water leaked. When an EPT sheet is in the above state, conventionally, repair has been carried out by pasting a repair sheet made of PVC or EPT on the existing EPT sheet. Specifically, as shown in FIG.
The adhesive 3 is applied to both the surface of the resin mortar 5 and the back surface of the repair sheet 4 made of PvC or EPT.
A repair sheet 4 made of vC or EPT was adhered. Alternatively, after a repair sheet made of PVC is treated with a brimer, the surface of the EPT sheet adhered to concrete and the
An adhesive was applied onto the brimer layer of the repair sheet made of VC, and a repair sheet made of PVC was adhered thereto (not shown). <Problems to be Solved by the Invention> Conventionally, EPT sheets have been repaired by the method described above. This is because no adhesive has been known that can sufficiently bond EPT and EPT or PvC. Among the conventional methods, the former method shown in FIG. 2 has a large number of steps, is complicated, takes time to construct, and is not economical. If you use the latter method, which is applied when the repair sheet is made of PVC, the EPT of the PVC repair sheet will be
Adhesion to existing sheets was insufficient. The present invention has been made in view of the above facts, and has excellent adhesion, base resistance, and water resistance, and can be applied to existing EPT sheets without brimer treatment.
The purpose of the present invention is to provide a convenient sheet waterproofing repair method using an adhesive that can bond repair sheets manufactured by the company. Means for Solving the Problems> The present invention is a method of bonding a repair sheet made of polyvinyl chloride or an ethylene-propylene terpolymer to an existing sheet made of an ethylene-propylene terpolymer. Then, to 100 parts by weight of the urethane-modified epoxy resin, 2 parts of the adhesion imparting agent for the ethylene/propylene terpolymer were added.
After applying an adhesive containing 0 to 150 parts by weight and a curing agent to at least one of the three adherends, the polyvinyl chloride or The present invention provides a sheet waterproof repair method characterized by adhering a repair sheet made of an ethylene-propylene terpolymer. The adhesive further contains 20 to 80 parts by weight of epoxidized natural rubber per 100 parts by weight of the urethane-modified epoxy resin.
It is preferable that it contains a certain amount of tackifying agent and/or a tackifying agent. The present invention will be explained in detail below. The present invention applies a specific adhesive to the surface of an existing EPT waterproof sheet and/or the back side of a repair waterproof sheet (made of PVC or EPT), and then attaches a repair waterproof sheet to the existing EPT waterproof sheet.
This is a construction method that adheres to a PT waterproof sheet. That is,
The present invention includes the following construction method. (a) EPT sheet 2 bonded to concrete 1
A method (first method) in which an adhesive 3 is applied to the front surface and the back surface of a repair sheet 4 made of PVC or EPT, and the repair sheet 4 made of PVC or EPT is bonded to the EPT sheet 2.
(See figure a). (b) A construction method (341b
(see figure). (C) EPT sheet 2 adhered to concrete 1
A construction method in which an adhesive 3 is applied to the surface and a repair sheet 4 made of PvC or EPT is adhered to the area where the adhesive 3 is applied (see Fig. 1C). The adhesive used in carrying out the above repair method is also used to join the ends of a repair waterproof sheet made of EPT or PvC. In the present invention, a specific two-component adhesive described below is used as the adhesive, so after mixing the two components in a predetermined ratio, the adhesive is coated under normal conditions, such as by comb coating, roller coating, brush coating, etc. , the adhesive is applied in a coating amount of about 200 to 600 g/m'. Thereafter, the volatile matter is evaporated as necessary, a repair waterproof sheet is crimped, and the repair work is completed after curing for approximately 0.5 to 7 days. Note that the repair waterproof sheet may be applied to the entire surface of the existing EPT sheet, or may be applied to a portion of the existing EPT sheet. Applying the construction method of the present invention &:! The EPT sheet with 1% I and used as an adherend is made of ethylene, propylene, butadiene, dicyclopentadiene, 5-methylene-2-
It is a sheet made of a terpolymer made of a diene such as norbornene, and a PvC sheet is a sheet made of a soft vinyl chloride resin or its copolymer resin. Examples of vinyl chloride copolymer resins include vinyl chloride vinylidene chloride copolymer resins, ethylene/vinyl chloride copolymers, and ethylene/vinyl acetate/vinyl chloride copolymer resins. The adhesive is (1) Urethane-modified epoxy resin II! 100! (2) 100 parts by weight of urethane-modified epoxy resin,
20 to 150 parts by weight of an adhesion imparting agent to the ethylene/propylene terpolymer, and 20 to 150 parts by weight of epoxidized natural rubber.
80 parts by weight and a curing agent, or (3) a tackifier in addition to (1) or (2) above. The following are the ingredients contained in the adhesive: will be explained in detail.The components contained in the adhesive used in the present invention are a urethane-modified epoxy resin, an adhesive agent for EPT, a curing agent, an epoxidized natural rubber, and a tackifier.Urethane-modified epoxy The resin is obtained by reacting (a) a compound having an epoxy group and a hydroxyl group with (b) a urethane bond-containing compound containing an isocyanate group at the end obtained from a polyhydroxyl compound and a polyisocyanate compound. (a) A compound having an epoxy group and a hydroxyl group is a compound having 1 to 3 epoxy groups and 1 to 2 hydroxyl groups in the molecule, and preferably has a molecular weight of 70 to 2.
000 compounds. Examples include glycidyl ethers of polyhydric alcohols such as glycidol, ethylene glycol monoglycidyl ether, and glycerin diglycidyl ether, and commercially available epoxy resins having hydroxyl groups. (b) The urethane bond-containing compound containing an isocyanate group at the terminal is produced by the reaction of (b-1) a polyhydroxyl compound and (b-2) a polyisocyanate compound. (b-i) As the polyhydroxyl compound, for example,
Examples include various polyester polyols or polyether polyols used in the production of general urethane compounds. Examples of the polyester polyols mentioned here include condensates of polyhydric alcohols and polybasic carboxylic acids, condensates of hydroxycarboxylic acids and polyhydric alcohols, etc. The polyhydric alcohols used in these include, for example, Examples of polybasic carboxylic acids include ethylene glycol, propylene glycol, butanediol, diethylene glycol, glycerin, hexanetriol, and trimethylolpropane. Examples of polybasic carboxylic acids include adipic acid, geltal acid, azelaic acid, fumaric acid, maleic acid, and phthalic acid. , terephthalic acid, dimer acid, pyromellitic acid, etc. In addition, as condensates of hydroxycarboxylic acids and polyhydric alcohols, castor oil, castor oil and ethylene glycol,
Reaction products such as propylene glycol are also useful. Examples of polyether polyols include products obtained by addition-polymerizing one or more alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran to a compound having two or more active hydrogens, Any known polyether polyol used in the production of ordinary polyurethane resins can be used. In this case, examples of compounds having two or more active hydrogens include the polyhydric alcohols and polybasic carboxylic acids mentioned above, amines such as ethylenediamine and hexamethylenediamine, ethanolamine, propatoolamine, etc. Examples include alkanolamines, resorcinol, polyhydric phenols such as bisphenol, and castor oil. (b-2) The polyisocyanate compound used in the production of a urethane bond-containing compound containing an isocyanate group at the end is a compound having two or more isocyanate groups in the molecule, and is a compound that has two or more isocyanate groups in its molecule. For example, tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, triphenylmethane triisocyanate, etc. can be used. The urethane-modified epoxy resin has the above (a) and (b-1)
(b-2), preferably produced as follows. The urethane bond-containing compound containing an isocyanate group at the end can be obtained by reacting a polyhydroxyl compound and a polyisocyanate compound in the same manner as in the production method of a usual isocyanate group-containing urethane prepolymer. A urethane-modified epoxy resin can be obtained by reacting a urethane bond-containing compound containing an isocyanate group at the end with the above-mentioned compound having an epoxy group and a hydroxyl group by a conventional method. The adhesion imparting agent for EPT may be any adhesive compound having a polarity close to that of EPT, but preferably butyl rubber, halogenated butyl rubber, EPT, styrene-ethylene/butylene block copolymer, and carboxy group-containing styrene- One or more types of ethylene/butylene block copolymers are used. As the curing agent, a general curing agent for epoxy resins can be used, but preferably a curing agent used in a room-temperature curing solvent-based epoxy resin adhesive is used. Specifically, aliphatic polyamines, aromatic polyamines, modified aliphatic polyamines, polyamide amines, various mercaptan curing agents, liquid NBR1 having an amino group at the end
Acid anhydride, latent curing agent, ′! Examples include J tertiary amicyamine, and polyamines are preferred. These curing agents may be used alone or in combination. Epoxidized natural rubber is made by oxidizing some of the double bonds of natural rubber latex to epoxidize it. For example, ENR-2 is oxidized using peracetic acid, etc.
0, ENR-30, ENR-50 (both KUM
POLANGtlTHRIE 5ENDIRI^N B
ER) manufactured by IAD) are commercially available, and these may be used. Such epoxidized natural rubber is compatible with epoxy resins, and when mixed with epoxy resins, imparts excellent tack to the epoxy resin composition and improves the initial adhesion of the composition. The epoxidation rate of the epoxidized natural rubber is preferably 20% or more, preferably 30% or more of the double bonds present in the natural rubber. If it is less than 20%, the compatibility with the epoxy resin is poor,
This is because, on the contrary, the tackiness decreases. Examples of the tackifier include rosin or its derivatives, natural resins such as terpene resins, petroleum resins, and hydrogenated petroleum resins, and one or more of these may be used. More specifically, the rosin includes, for example, gum rosin, kutudrozin,
Tall oil, etc., and its derivatives include modified rosin,
Examples include its methanol ester, its glycerin ester, its pentaerythritol ester, and hydrogenated products thereof. Petroleum resins include aromatic petroleum resins and copolymer petroleum resins made of styrene, α-methylstyrene, vinyltoluene, indene, methylindene, etc.; hydrogenated petroleum resins include cyclopentadiene-based hydrogenated petroleum resins; Examples include resins, hydrogenated petroleum resins containing C4 and Cs, and the like. Next, the blending amount of each component will be described. The adhesive used in the present invention is urethane-modified epoxy resin t
ooii parts of adhesion imparting agent for EPT
~150 parts by weight, preferably 50-120 parts by weight, and a curing agent. Parts by weight, preferably 50-120! Volume and epoxidized natural rubber 20-80I! part by weight, preferably 30 to 70 parts by weight, and a curing agent.2) Alternatively, in 1) or (2) above, a tackifier is further contained. If the adhesion imparting agent for EPT is less than 2031 parts by weight, the adhesiveness of the cured product will be insufficient, and if it exceeds 150 parts by weight, even if the amount is more than this, there will be no particular effect, and the water resistance will be poor.・Base resistance deteriorates. The amount of curing agent used is not particularly limited, but preferably 10 to 2 parts by weight per 100 parts by weight of the urethane-modified epoxy resin.
00 parts by weight. Within this range, an appropriate curing speed will be achieved. Epoxidized natural rubber is 20! If the amount is less than 80 parts, the initial adhesion of the adhesive used in the present invention will be insufficient, and if it is more than 80 parts, the viscosity of the adhesive itself will become high, resulting in poor workability. The amount of the tackifier used is not particularly limited, but is preferably 20 to 100 parts by weight based on 1001i parts of the urethane-modified epoxy resin. Within this range, effects such as improved adhesion to adherends and cohesive force can be expected. In addition to the above-mentioned essential components, various additives can be added to the adhesive used in the present invention as needed. For example, solvents, anti-sagging agents, fillers, curing accelerators, pigments, adhesion promoters, antifoaming agents, leveling agents, polymerization agents, rubber,
These are plasticizers, heat-resistant anti-aging agents, and other additives. Furthermore, an unmodified epoxy resin may also be added. As the solvent, xylene, toluene, methyl ethyl ketone, etc. can be suitably used, and as the filler, silica, talc, calcium carbonate, calcium clay silicate, etc. can be suitably used. The adhesive used in the present invention may be manufactured as a two-component type containing only one of a urethane-modified epoxy resin and a curing agent, preferably a urethane-modified epoxy resin, an adhesion promoter, a filler, etc. together with a solvent. They may be mixed to form a one-part adhesive composition, and on the other hand, a curing agent, a solvent, a filler, etc. may be mixed to form a two-part adhesive composition, and a two-part room temperature curing adhesive composition may be obtained. <Example> The present invention will be specifically described below with reference to Examples and Comparative Examples. The composition of the adhesive used in the examples and comparative examples is shown in Table 1.
As shown. The adhesive liquid was obtained by mixing a urethane-modified epoxy resin, an adhesion agent for EPT, epoxidized natural rubber, a tackifier, a solvent, and other specified raw materials. The two-part adhesive was obtained by mixing a curing agent, a solvent, and other raw materials for the window. An EPT sheet and a PVC sheet were used as adherends to be adhered. EPT sheets and PvC sheets have a width of 25 mm,
A short piece with a length of 200 mm was used. After mixing the adhesive liquid and the adhesive two parts, it is mixed with EPT.
Apply the coating uniformly in the comb direction to the surface of the plastic sheet using a comb iron, press the EPT sheet or PvC sheet to the coated surface, and then apply the coating evenly in the comb direction. ! Curing (20±2° C., 60±10% RH) was performed. Peel adhesion strength was measured under the following conditions using a test piece after 48 hours of normal curing. The results are shown in Table 1.

[1] Peel adhesion strength (a)'FJ! ! At room temperature, 180 degrees at a tensile speed of 200 mm/min! I
J 1m! The test was conducted. (b) Water Resistance Test After immersing the piece in warm water at 40°C for 48 hours, a peel test was conducted under the same conditions as the normal adhesive strength. (c) Place the base resistance test piece in a 0.1% sodium hydroxide aqueous solution at room temperature for 48 hours.
After soaking for a period of time, a peel test was conducted under the same conditions as for normal adhesive strength. (d) Heat resistance test piece was heated for 48 hours in a constant temperature bath adjusted to 80°C, then allowed to cool at room temperature for 2 hours, and a peel test was conducted under the same conditions as the normal adhesive strength. Explanation of the ingredients of the adhesive 1) Glycidol, polytetramethylene glycol (molecular weight 82) Glycidol, polybutylene diglycol (
Molecular weight: 20013) Hydrogenated bisphenol A type epoxy resin EP-4080, manufactured by Asahi Denka Kogyo Co., Ltd. (epoxy equivalent: 25
0) 4>Terminal amine acrylonitrile/butadiene rubber HYCARATBN 1300x16, Goodrichke; 5) Modified aliphatic Boriakun Adeka hardener E) I-270, Asahi Denka Kogyo Co., Ltd. 6
) 2.4.6-)-ly(dimethylaminomethyl)phenol sequal TDMP manufactured by Seiko Kagaku Co., Ltd. 7) Clayton G1652, manufactured by Shell Chemical Co., Ltd. 8
) Toughtic M, manufactured by Asahi Kasei Corporation 9
) Finton 1500. Nippon Zeon Co., Ltd. 5
0), urethane-modified epoxy 1M resin made from tolylene diisocyanate (epoxy equivalent: 680) O), urethane-modified epoxy resin made from isophorone diisocyanate (epoxy equivalent: 1300) Made by Michal As is clear from Table 1, z1 By the construction method of the present invention, EPT
By adhering EPT sheets to each other or an EPT sheet and a PVC sheet, although it is a simple method, it was possible to achieve adhesion with high normal adhesive strength, water resistance, base resistance, and heat resistance. Furthermore, among the methods of the present invention, it has been found that a practically sufficient adhesive force can be obtained by applying an adhesive to only one of the three adherends. <Effects of the Invention> Since the adhesive used in the sheet waterproofing repair method of the present invention has the following characteristics, the present invention can improve workability and shorten the time required to repair EPT waterproof sheets. Performance after repair increases significantly. (1) Long pot life. (2) Oven assembly time can be longer. (3) EPT sheets or EPT sheets and PvC sheets can be bonded together without a brimer treatment. (4) Adhesion can be achieved by coating on one side of the adherend. (5) Excellent adhesiveness. (6) Excellent flexibility. (7) Good water resistance and base resistance.

[Brief explanation of drawings]

FIGS. 1a, 1b, and 1c are diagrammatic cross-sectional views illustrating the sheet waterproofing repair method of the present invention. FIG. 2 is a diagrammatic cross-sectional view illustrating a conventional sheet waterproofing repair method. Description of symbols 1...Concrete, 2...-EPT sheet, 3...Adhesive, 4...PVC or EPT repair sheet, 5...Resin mortar FIG, 1a FIG, 1b FIG, 1c

Claims (3)

[Claims] (1) A method of adhering a repair sheet made of polyvinyl chloride or an ethylene propylene terpolymer to an existing sheet made of an ethylene propylene terpolymer, in which 100 parts by weight of a urethane-modified epoxy resin is added. On the other hand, adhesion promoter 20 for ethylene-propylene terpolymer
After applying an adhesive containing ~150 parts by weight and a hardening agent to at least one of the two adherends, the polyvinyl chloride or ethylene - A sheet waterproofing repair method characterized by adhering a repair sheet made of propylene terpolymer. (2) The adhesive further includes epoxidized natural rubber,
20 to 100 parts by weight of urethane-modified epoxy resin
The sheet waterproofing repair method according to claim 1, wherein the sheet waterproofing repair method contains 80 parts by weight. (3) The sheet waterproofing repair method according to claim 1 or 2, wherein the adhesive further contains a tackifier.