JP6184000B2 - Waterproof finish structure, waterproof finish method, and breathable sheet body used for the same - Google Patents

Description

  The present invention relates to a waterproof finishing structure and waterproof finishing method for FRP waterproofing in which an unsaturated polyester resin and a fiber reinforcement are laminated and combined on a flat roof of a concrete building roof or a veranda of a wooden detached house. In detail, there is no swelling or peeling due to the influence of moisture in the base concrete, and there is no breakage even if the base expands or contracts over a long period of time. The present invention relates to a waterproof finishing structure and a waterproof finishing method in which the unsaturated polyester resin fiber reinforced resin layer does not burn and spread even when a fire type is placed on it, and a breathable sheet used for them.

  Conventionally, when a waterproof coating is applied on the roof of a concrete building, if the foundation concrete contains excessive moisture or if excess moisture is supplied to the foundation concrete for some reason after construction, In some cases, the material swells or the moisture reduces the adhesive strength with the underlying concrete and causes peeling.

  In order to prevent such swelling and peeling, and as a waterproof coating material that can be constructed in a short construction period, a composite waterproof construction method and a composite waterproof structure (Patent Document 1) obtained thereby have been proposed. In the composite waterproofing method, a sheet-type roofing material is laid on the base surface directly or through an appropriate layer, and the sheet-type roofing material is mechanically fixed using a fixing bracket, and then directly or appropriately on the sheet-type roofing material. It is characterized in that the fiber reinforced resin layer is formed through the layer.

  However, since the composite waterproofing method mechanically fixes the sheet-type roofing material directly using a fixing bracket, the sheet-type roofing material is generated when a complex and strong negative pressure that pulsates around the rooftop parapet is generated by a strong wind such as a typhoon. When the strength of the material is weak, there is a problem that the sheet-based roofing material is broken around the fixing metal fitting, and as a result, the entire composite waterproof structure may be largely peeled off.

  To solve this problem, instead of fixing the breathable sheet body directly with a fixture, apply an unsaturated polyester resin fiber reinforced resin layer on the breathable sheet, and then vent it with a fixture from above. A waterproof finishing structure and a waterproof finishing method for fixing a conductive sheet to a base have been proposed (Patent Document 2). The waterproof finish structure includes an unsaturated polyester resin in which a breathable sheet body in which a non-breathable layer is laminated on at least one surface of a fibrous base material is disposed on the surface of a base, and is applied to a partial surface of the breathable sheet body. A fiber reinforced resin layer, a fixture driven into the substrate from the unsaturated polyester resin fiber reinforced resin layer, at least a surface portion of the breathable sheet body on which the unsaturated polyester resin fiber reinforced resin layer was not previously applied, and the It is characterized by being finished from an unsaturated polyester resin fiber reinforced resin layer formed so as to cover the fixture.

JP 2001-193230 A Japanese Patent No. 40663323

However, the waterproof finishing structure and the waterproof finishing method shown in Patent Document 2 are partially fixed even if the breathable sheet body and the waterproof finishing structure integrated therewith are fixed to the ground concrete with a fixture. In areas other than those fixed with tools, there is a problem in that the air-permeable sheet body and the waterproof concrete structure integrated with the air-permeable sheet body have insufficient adhesion to the ground concrete, as described above. When a complex and strong negative pressure that pulsates around the rooftop parapet is generated by a strong wind such as a typhoon, the breathable sheet body and the base concrete exfoliate and swell greatly at parts other than the part fixed by the fixture. There is a problem that becomes a state.

Also, in the waterproof finishing structure and waterproof finishing method disclosed in Patent Document 2, the unsaturated polyester resin fiber reinforced resin layer applied on the breathable sheet body is coated with an adhesive primer on the breathable sheet body. Although it is not clear whether or not the adhesive primer is applied, even if the adhesive primer is applied, the expansion and contraction of the concrete when the ground concrete expands and contracts due to long-term summer / winter temperature fluctuations, earthquakes, etc. There is a problem that the waterproof finished structure may be peeled off from the base without being able to follow.

Furthermore, the waterproof finishing structure and the waterproof finishing method are presumed from the results of numerous experiments carried out in making the present invention, and the air layer between the air-permeable sheet body and the base can be moved to a considerable extent. This is considered to be an effect, but when a fire is placed on the unsaturated polyester resin fiber reinforced resin layer, the fire of the fire type burns to the unsaturated polyester resin fiber reinforced resin layer and further spreads. was there.

  The problem to be solved by the present invention is that the air-permeable sheet body does not easily peel off due to sufficient contact with the base, and as a result, the air-permeable sheet body peels off even if a negative pressure that pulsates due to strong wind occurs. The unsaturated polyester resin fiber reinforced resin layer does not break even if the base expands or contracts over a long period of time, and even if a fire is placed on the unsaturated polyester resin fiber reinforced resin layer. It is an object of the present invention to provide a waterproof finish structure and a waterproof finish method that do not burn and spread, and a breathable sheet used for them.

The invention described in claim 1 is based on a moisture curable urethane resin adhesive having a resin solid content of 50 to 90% by weight and a viscosity of 4.0 to 25.0 Pa · s / 25 ° C. / ^{m 2} was applied, immediately coating surface, the basis weight 150 to 250 g / fibrous substrate non-breathable layer on one side of the ^{m 2} is laminated fiber basis weight 50～160G / ^{m 2} on the non-breathable layer The breathable sheet body is arranged so that the fibrous base material surface of the breathable sheet body further laminated with a porous layer is in contact, and a primer is not applied directly on the fibrous layer of the breathable sheet body. An unsaturated polyester resin fiber reinforced resin layer is formed by applying a saturated polyester resin and further laminating a fiber reinforcing material, and the unsaturated polyester resin fiber reinforced resin layer is 2.5 unsaturated polyester resin per gram of fiber reinforcing material. It consists of ~ 6.0g and is coated Unsaturated polyester resin amount to provide a waterproof finish structure, which is a 1.2~5.0kg / ^{m 2.}

The invention according to claim 2 is based on a moisture curable urethane resin adhesive having a resin solid content of 50 to 90% by weight and a viscosity of 4.0 to 25.0 Pa · s / 25 ° C. / ^{m 2} was applied, immediately coating surface, the basis weight 150 to 250 g / fibrous substrate non-breathable layer on one side of the ^{m 2} is laminated fiber basis weight 50～160G / ^{m 2} on the non-breathable layer The breathable sheet body is arranged so that the fibrous base material surface of the breathable sheet body further laminated with a porous layer is in contact, and a primer is not applied directly on the fibrous layer of the breathable sheet body. An unsaturated polyester resin fiber reinforced resin layer is formed by applying a saturated polyester resin and further laminating a fiber reinforcing material, and the unsaturated polyester resin fiber reinforced resin layer is 2.5 unsaturated polyester resin per gram of fiber reinforcing material. It consists of ~ 6.0g and is coated Unsaturated polyester resin amount to provide a waterproof finish method which is a 1.2~5.0kg / ^{m 2.}

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The waterproof finishing structure according to claim 1 of the present invention and the waterproof finishing method according to claim 2 are a moisture curable urethane having a resin solid content of 50 to 90 wt% and a viscosity of 4.0 to 25.0 Pa · s / 25 ° C. A resin adhesive is applied to a base of 0.3 to 0.5 kg / m ² , and a non-breathing layer is immediately laminated on one side of a fibrous base material having a basis weight of 150 to 250 g / m ^{2 on the} coated surface. The breathable sheet body is disposed so that the fibrous base material surface of the breathable sheet body on which a fiber layer having a basis weight of 50 to 160 g / m ² is further laminated is in contact, and the fibers of the breathable sheet body In order to form an unsaturated polyester resin fiber reinforced resin layer by applying an unsaturated polyester resin directly without applying a primer on the porous layer and further laminating a fiber reinforcement, the moisture curable urethane is applied to the fibrous base material. Resin adhesive fully penetrates and cures There is an effect that that. In addition, after the moisture-curing urethane resin adhesive is applied to the base, the breathable sheet can be immediately provided, so that the construction time can be shortened.

  In particular, since the adhesive that fixes the breathable sheet to the base is a moisture-curing urethane resin adhesive, the adhesive layer becomes finely foamed during the curing reaction by moisture and penetrates into the fibrous base material. Since the area in contact with air increases and finer foaming occurs, there is an effect that the fibrous base material is reinforced without impairing the air permeability of the fibrous base material. For this reason, it has the effect that it is in close contact with the base and does not easily peel off, and the unsaturated polyester resin fiber reinforced resin layer formed on the non-breathable layer due to the breathability of the fibrous base material being held is There is an effect that swelling does not occur under the influence of moisture.

  In addition, moisture-curing urethane resin adhesives have a certain degree of flexibility unique to urethane resins, so that the rooftop basement expands and contracts due to large temperature changes in summer and winter, and some cracks occur. Even if the crack width expands or contracts due to temperature change or vibration, it has the effect of following these expansion and contraction.

  Since the non-breathable sheet body has a non-breathable layer laminated on one side of the fibrous base material, the unsaturated polyester resin fiber reinforced resin layer formed on the non-breathable layer penetrates into the fibrous base material. Therefore, the moisture in the base material diffuses and moves through the fibrous base material layer as described above, and the unsaturated polyester resin fiber reinforced resin layer is swollen by the influence of moisture. There is an effect that there is nothing to do.

In addition, since a breathable sheet body in which a fibrous layer having a basis weight of 50 to 160 g / m ² is further laminated on the non-breathable layer of the breathable sheet body is used, an unsaturated polyester resin is applied to the fibrous layer. Then, it is necessary to apply an adhesive primer at the time of applying the unsaturated polyester resin when forming the unsaturated polyester resin fiber reinforced resin layer because the fibers forming the fibrous layer spread and integrate in the unsaturated polyester resin layer. There is no effect. For this reason, the number of construction processes is reduced, and there is an effect that construction can be performed in a short construction period.

  In addition, since the breathable sheet and the unsaturated polyester resin fiber reinforced resin layer are integrated through the fibrous layer without having an adhesive interface, the unsaturated polyester resin fiber reinforced resin can be used even if the base is stretched over a long period of time. There is an effect that the layer does not peel off or break.

  Furthermore, since the moisture curable urethane resin adhesive is osmotically cured in a fine foam state on the fibrous base material of the breathable sheet body and the fine foam is in a discontinuous independent foam state, the air permeability is reduced. Part of the air layer between the porous sheet body and the base cannot move freely, and the unsaturated polyester resin fiber reinforced resin layer is a fibrous material laminated on the non-breathable layer of the breathable sheet body. In order to integrate the layer directly impregnated without applying an adhesive primer containing a large amount of flammable liquid such as a solvent, it is possible to place a fire on the unsaturated polyester resin fiber reinforced resin layer. There is an effect that a fire of a fire type is transferred to the unsaturated polyester resin fiber reinforced resin layer and does not spread further.

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  The present invention will be described in detail below.

  The moisture-curing urethane resin adhesive used in the present invention is composed of a terminal isocyanate prepolymer that is cured by moisture in the atmosphere, and a diluent, a dehydrating agent, a filler, an antifoaming agent, a catalyst, and the like are blended as necessary. The The terminal isocyanate prepolymer is obtained by reacting a polyol and an isocyanate compound, and the isocyanate compound includes 2,4′-diphenylmethane diisocyanate (2,4′-MDI), 4,4′-diphenylmethane diisocyanate (4,4 ′). -MDI), polymeric diphenylmethane diisocyanate (p-MDI), tolylene diisocyanate (TDI), naphthalene diisocyanate and other aromatic polyisocyanate compounds, aliphatic polyisocyanate compounds such as hexamethylene diisocyanate and isophorone diisocyanate, and alicyclic poly Isocyanate compounds and the like can be used, and these compounds can be used alone or as a mixture. More preferable polyisocyanate compounds include MDI and TDI of aromatic polyisocyanates.

  Polyols include polyoxyethylene polyols, polyoxypropylene polyols, random or block copolymer polyoxyethylene-propylene copolymer polyols, amine compounds (methylamine, ethylamine, propylamine, ethylenediamine, propylenediamine, etc.) and ethylene. Polyols obtained by ring-opening polymerization of oxide or propylene oxide, polyether polyols such as polyoxytetramethylene glycol, dicarboxylic acids (adipic acid, succinic acid, maleic acid, phthalic acid, etc.) and glycols (ethylene glycol, propylene) Glycol, 1,4-butylene glycol, 1,6-hexanediol, neopentyl glycol, etc.) Butylene adipate adipate polyols, polyester polyols such as polyhexamethylene adipate polyol, there are polylactone polyols, and the like, usually the molecular weight may be used alone or in combination those of 200 to 20,000. Of course, low molecular weight polyols can also be used, and examples thereof include polyols such as ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, hexanediol, glycerin, and trimethylolpropane. It is used alone or as a mixture as described above.

  The terminal isocyanate prepolymer is obtained by reacting the hydroxyl group of the polyol so that the NCO group of the isocyanate compound is excessive, and the NCO group-containing concentration is 1% by weight or more. When the NCO group-containing concentration is less than 1% by weight, the reactivity with moisture in the air is lowered, and the foam contained in the cured adhesive is reduced. For this reason, the air permeability of the fibrous base material of the air permeable sheet provided immediately after the moisture-curable urethane resin adhesive of the present invention is applied to the foundation concrete is hindered.

  Further, the resin solid content of the moisture curable urethane resin adhesive of the present invention is 50 to 90% by weight, and if it is less than 50% by weight, adhesion to the breathable sheet is insufficient, and if it exceeds 90% by weight, it is applied to the base. In addition to poor workability, the air-permeable sheet is not sufficiently penetrated into the fibrous base material. The solid content was obtained by allowing the solid content to stand at 105 ° C. for 3 hours and then measuring the weight, and calculating the weight percentage with respect to the initial weight.

  Moreover, the viscosity of the moisture-curable urethane resin adhesive of the present invention is 4.0 to 25.0 Pa · s / 25 ° C., and if it is less than 4.0 Pa · s / 25 ° C., it can be applied to the base by a coating operation. A sufficient amount of coating cannot be secured, resulting in insufficient adhesion of the air permeable sheet body. When the temperature exceeds 25.0 Pa · s / 25 ° C., the air permeable sheet body does not penetrate into the fibrous base material. In addition to being sufficient, workability when applied to the base becomes poor. The viscosity is measured with a B-type viscometer, No. 4 rotor, 20 rpm.

The properties of the moisture curable urethane resin adhesive of the present invention are as described above, but the coating amount of the breathable sheet body on the base is 0.3 to 0.5 kg / in relation to the basis weight of the fibrous base material. a m ^2. Is less than 0.3 kg / m ² becomes insufficient adhesion breathable sheet, the 0.5 kg / m ² greater than the air permeability of the fibrous base material of the breathable sheet is inhibited.

The basis weight of the fibrous base material of the breathable sheet used in the present invention is 150 to 250 g / m ² , and if the basis weight is less than 150 g / m ² , the moisture curable urethane resin adhesive is the above coating amount. when applied to the substrate, which almost all the gaps of the fibrous base material of the breathable sheet which is disposed gone meets adhesive breathable become defective, the 250 g / m ^2, greater than moisture curing The reinforcement of the fibrous base material due to the application amount of the type urethane resin adhesive becomes insufficient, and as a result, the adhesiveness of the breathable sheet body becomes poor.

In addition, the breathable sheet used in the waterproof finishing structure or waterproof finishing method of the present invention has a non-breathable layer laminated on one side of a fibrous base material and has a basis weight of 50 to 160 g / m ² on the non-breathable layer. The fiber layer is further laminated, and the fiber base material and the fiber layer are not particularly limited as long as they are made of a breathable material or structure. For example, polyester, nylon, vinylon, acrylic Non-woven fabrics and woven fabrics processed from synthetic fibers such as synthetic fibers such as these, mixed fibers mixed with these, inorganic fibers such as glass fibers, natural fibers such as hemp fibers, and composite fibers in which synthetic fibers are mixed with inorganic fibers and natural fibers Etc. are used.

In particular fibrous layers which are laminated on the air-impermeable layer basis weight is 50~160g / m ^2, is less than 50 g / m ² is integrated with the air-permeable sheet and an unsaturated polyester resin fiber-reinforced resin layer If it exceeds 160 g / m ² , the finish of the unsaturated polyester resin fiber reinforced resin layer becomes poor.

  For the non-breathing layer, a non-breathable material having a thickness of about 0.1 to 1.0 mm such as a resin sheet, for example, a synthetic resin sheet such as polyethylene resin, polypropylene resin, or vinyl chloride resin, or an asphalt sheet is used.

The breathable sheet used in the present invention is JIS L 1096 (general fabric test method; 1999) 8.14 tensile strength (JIS method A method (strip method), test specimen size 50 × 300 mm, gripping space). The tensile strength in each of the longitudinal and lateral directions is 350 to 1000 N / 50 mm in accordance with an interval of 200 mm and a tensile speed of 150 mm / min). When shear, wind pressure, or other external force is applied to the sheet body, voids are generated between the base and the waterproof layer, which may cause floating and peeling. If the tensile strength exceeds 1000 N / 50 mm, the rigidity is high and the moldability is deteriorated, and the waterproof finish structure is wrinkled or bent, resulting in poor finishing.

The unsaturated polyester resin fiber reinforced resin layer formed on the fiber layer of the breathable sheet is formed by applying the unsaturated polyester resin directly on the fiber layer and further laminating the fiber reinforcement. However, the unsaturated polyester resin fiber reinforced resin layer comprises 2.5 to 6.0 g of unsaturated polyester resin per gram of fiber reinforcement, and the amount of the unsaturated polyester resin applied is 1.2 to 5.0 kg / m. ² . If the amount of the unsaturated polyester resin per 1 g of the fiber reinforcement is within this range and the amount of the unsaturated polyester resin applied is 1.2 to 5.0 kg / m ² , the top of the fiber layer of the breathable sheet body The unsaturated polyester resin fiber reinforced resin layer formed in 1 may be 1 ply or 2 ply (the fiber reinforcing material may be one or two). Also, the coating method is a method of forming an unsaturated polyester resin fiber reinforced resin layer by directly applying an unsaturated polyester resin mixed with a curing agent on a fiber layer and then placing a glass fiber sheet as a fiber reinforcing material. For example, an unsaturated polyester resin in which a glass fiber sheet is arranged and a curing agent is mixed is applied and the glass fiber sheet is impregnated with the unsaturated polyester resin. The method may be such that it is applied directly to the surface.

When the coating amount of the unsaturated polyester resin to be directly applied on the fibrous layer is less than 2.5 g per 1 g of the fiber reinforcement or the amount of the unsaturated polyester resin to be applied is less than 1.2 kg / m ² , the waterproof layer In some cases, the waterproof effect is insufficient, and if it exceeds 6.0 g or the applied unsaturated polyester resin exceeds 5.0 kg / m ² , the waterproof finish structure becomes too rigid and peels off from the substrate. In some cases, when a fire type is placed on the unsaturated polyester resin fiber reinforced resin layer, the fire of the fire type may burn and spread over the unsaturated polyester resin fiber reinforced resin layer.

The unsaturated polyester resin used in the present invention has a tensile strength of 10 to 50 N / mm ² measured by JIS K 7113 at 24 ° C. and a curing time of 24 hours, and an elongation at break of 25 to 120%. It is preferable that If the tensile strength is less than 10 N / mm ² or the elongation at break exceeds 120%, the waterproof effect is insufficient, and if the tensile strength exceeds 50 N / mm ² or less than 25% at break, the rigidity becomes too high. May peel from the groundwork. As a commercially available unsaturated polyester resin satisfying these properties, there is JOLIES JE-2000 (trade name, manufactured by Aika Industry Co., Ltd.).

A top coat can be applied on the unsaturated polyester resin fiber reinforced resin layer for protection and design (aesthetics) of the unsaturated polyester resin fiber reinforced layer. For the top coat, unsaturated polyester resin, water-based acrylic resin, acrylic urethane resin, or the like can be used. The coating amount of the top coat is about 0.2 to 0.8 kg / m ² , which is small, and in this range, there is no influence on the performance of the already formed polyester resin fiber reinforced resin layer and the waterproof finish structure of the present invention. .

  Hereinafter, it demonstrates concretely in an Example and a comparative example.

Example 1
As Example 1, a fibrous base material is a non-woven fabric processed from polyester fiber having a basis weight of 200 g / m ² , and a non-breathing layer made of a polyethylene film of 0.3 mm is laminated on one side of the non-breathing layer. JIS L 1096 (general woven fabric test method; 1999) 8.14 tensile strength (JIS method A method (strip method), test) with a breathable sheet body obtained by laminating nonwoven fabrics processed from polyester fibers with a basis weight of 56 g / m ² A body size of 50 × 300 mm, an interval between grips of 200 mm, and a tensile speed of 150 mm / min) was used in the vertical direction: 550 N / 50 mm and the horizontal direction: 600 N / 50 mm. Adhesion of the air-permeable sheet body to the substrate uses a moisture-curing urethane resin adhesive with an NCO group-containing concentration of 2.5% by weight, a viscosity of 4.0 Pa · s / 25 ° C., and a solid content of 80%. The application amount of the adhesive was 0.3 to 0.5 kg / m ² . Immediately after the adhesive is applied to the base, the breathable sheet is pasted so that the fibrous base material surface of the breathable sheet is on the base. Next, 1.2 kg / m ^{2 of} an unsaturated polyester resin (Aika Kogyo Co., Ltd. Jolieth JE-2000) blended with a curing agent was applied, and immediately a glass fiber mat JR- with a basis weight of 450 g / m ² was used as a fiber reinforcement. 98 (trade name, manufactured by Aika Industry Co., Ltd.) is installed. After the unsaturated polyester resin is cured, an unsaturated polyester resin blended with a curing agent as a top coat (Aika Industry Co., Ltd., Jolie's JE-2080, tensile strength 40 N / mm ² , elongation at break 3%) Was coated with 0.6 kg / m ² to form an unsaturated polyester resin fiber reinforced layer, and the waterproof finish structure of Example 1 was obtained.

Example 2
As Example 2, the fibrous base material is a non-woven fabric processed from polyester fiber having a basis weight of 200 g / m ² , and a non-breathable layer made of a polyethylene film of 0.3 mm is laminated on one side, JIS L 1096 (general woven fabric test method; 1999) 8.14 tensile strength (JIS method A method (strip method), test) with a breathable sheet body obtained by laminating nonwoven fabrics processed from polyester fibers with a basis weight of 56 g / m ² A body size of 50 × 300 mm, an interval between grips of 200 mm, and a tensile speed of 150 mm / min) was used in the vertical direction: 550 N / 50 mm and the horizontal direction: 600 N / 50 mm. Adhesion of the air-permeable sheet body to the substrate uses a moisture-curing urethane resin adhesive with an NCO group-containing concentration of 2.5% by weight, a viscosity of 4.0 Pa · s / 25 ° C., and a solid content of 80%. The application amount of the adhesive was 0.3 to 0.5 kg / m ² . Immediately after the adhesive is applied to the base, the breathable sheet is pasted so that the fibrous base material surface of the breathable sheet is on the base. Next, 2.1 kg / m ^{2 of} unsaturated polyester resin (Aika Kogyo Co., Ltd. Jolieth JE-2000) blended with a curing agent was applied, and immediately a glass fiber mat JR- with a basis weight of 380 g / m ² was used as a fiber reinforcement. 94 (trade name, manufactured by Aika Industry Co., Ltd.) is installed. After the unsaturated polyester resin is cured, an unsaturated polyester resin (Aika Kogyo Co., Ltd. Jolie JE-2000) is further applied to 2.1 kg / m ² , and immediately a glass fiber having a basis weight of 380 g / m ² as a fiber reinforcement. Matt JR-94 (trade name, manufactured by Aika Industry Co., Ltd.) is provided. After the unsaturated polyester resin is cured, an unsaturated polyester resin blended with a curing agent as a top coat (Aika Industry Co., Ltd., Jolie's JE-2080, tensile strength 40 N / mm ² , elongation at break 3%) Was coated with 0.6 kg / m ² to form an unsaturated polyester resin fiber reinforced layer, and the waterproof finish structure of Example 2 was obtained.

Example 3
Before applying the moisture-curing urethane resin adhesive as a base, a solvent-type urethane primer JU-70 (trade name, manufactured by Aika Industry Co., Ltd., component MDI, solid content 36% by weight, solvent: dimethyl carbonate, propylene glycol A waterproof finish structure was formed in the same manner as in Example 2 except that a base coated with 0.1 kg / m ^{2 of} methyl ether acetate) and dried was used to form a waterproof finish structure in Example 3.

Comparative Example 1
As a comparative example 1, after applying a breathable sheet body in Example 1, before applying an unsaturated polyester resin (Aika Kogyo Co., Ltd. Jolies JE-2000) blended with a curing agent, a solvent-type urethane primer A waterproof finish structure was formed in the same manner as in Example 1 except that 0.1 kg / m ^{2 of} JU-70 was applied and dried at 23 ° C. for 2 hours to obtain a waterproof finish structure of Comparative Example 1.

Evaluation items and evaluation methods

Adhesion (peel strength)
The waterproof finished structures of Examples 1 to 3 and Comparative Example 1 were each bonded to a plywood substrate at a test temperature of 25 ° C. with an adhesive surface of about 2.5 × 2.5 cm / non-adhesive surface of 2.5 × 7.5 cm. A specimen having a size of 2.5 × 10 cm and cured for 7 days was used as a test specimen. The end of the non-adhesive surface of the test specimen was fixed to a spring scale, and a tensile load was applied at an angle of 90 ° until the test specimen broke at a speed of 5 N / sec. The fracture state of the specimen due to the loading was confirmed visually, and the maximum loading (N) obtained was divided by the width of the adhesive surface of 2.5 cm to calculate the peel strength (N / cm). The destruction state was evaluated as follows. ○: No interface breakage. Δ: Some interface breaks. X: The entire surface is interface fracture.

Wind pressure resistance (planar bond strength)
Each of the waterproof finished structures of Examples 1 to 3 and Comparative Example 1 was formed on a concrete base under an atmosphere at a test temperature of 25 ° C. and cured for 7 days to obtain a test specimen. A steel jig having a bonding surface size of 40 × 40 mm was bonded to the test body with an epoxy adhesive, and a tensile load was loaded with the Kenken-type tensile tester until the test body was broken. Maximum loading amount obtained by the placing load (N) is divided by 1600 mm ² of the adhesive area was calculated planar adhesive strength (N / mm ^2). In this evaluation, when the waterproof finish structure according to the present invention is formed on the roof of a concrete building, a negative pressure is generated on the surface of the waterproof finish structure due to a strong wind such as a typhoon, and the negative pressure prevents the finish. This is done to confirm that the structure is not destroyed. The wind pressure resistance in JISA 4706-2000 and JISA 4702-2000 was 3600 Pa in the maximum grade S-7, so that the plane adhesive strength was evaluated as ○ when the plane adhesive strength exceeded 0.4 N / mm ² .

Fatigue resistance A flexible 8mm-thickness formed by forming the waterproof finish structures of Examples 1, 2 and Comparative Example 1 with a gap of 2 mm perpendicular to the longitudinal direction at the center in the longitudinal direction of the base. A test piece was formed on a plate substrate in a strip shape with a length of 300 mm parallel to the substrate longitudinal direction and a right angle of 100 mm. A strain load of ± 1.0 mm was applied in an atmosphere adjusted to a temperature of 20 ° C. using a fatigue tester that can move horizontally in the direction parallel to the longitudinal direction while keeping the specimen flat. The strain load was repeated 500 times in 10 minutes per cycle, and the presence or absence of occurrence of shear peeling was visually confirmed every 500 times. Evaluation was performed as follows. ○: No shear peeling occurs with 3 specimens at 1500 times. (Triangle | delta): Shear peeling will arise in one test body in more than 500 times and less than 1,500 times. X: Shear detachment occurs with all three specimens at less than 500 times.

耐膨is resistant <br/> Example 1, a waterproof finish structure of Example 2 and Comparative Example 1, to obtain a test body respectively formed on concrete slab of 300 mm × 300 mm × thickness 60mm in JISA5371. The surface of the concrete flat plate to which the moisture-curing urethane resin adhesive was applied was sufficiently polished and cleaned with sandpaper # 80. The test specimen was immersed in warm water at a temperature of 30 ° C., the water surface was adjusted to a position 10 mm below the surface of the coating film, and left to stand in a 23 ° C. room for 30 days to visually check for the occurrence of swelling. Evaluation was performed as follows. ○: No swelling occurs. X: Swelling occurs.

Flame-resistant 150 mm wide x 125 mm long x 9 mm thick JAS ordinary plywood are arranged in a laterally abutted state to form 300 mm wide x 125 mm long, separately 150 mm wide x 375 mm long x 9 mm thick JAS normal plywood Two pieces are arranged in a laterally abutting state and formed into a width of 300 mm × a length of 375 mm, and the above 300 mm width × a length of 125 mm is arranged in the lower part, and a top of the same is 300 mm × a length of 375 mm. Combined, it is formed as a whole with a width of 300 mm and a length of 500 mm, and each abutting portion is bonded and fixed with a butyl tape 50 mm wide and 0.9 mm thick from the surface of the plywood, and used as a base. A test specimen is formed by forming the waterproof finish structure of Example 1, Example 2 and Comparative Example 1 on the base and curing at 23 ° C. for 7 days. In the test, the longitudinal direction (500 mm) is held at an angle of 15 degrees so that the portion of 300 mm wide × 125 mm long formed of a normal plywood 150 mm wide × 125 mm long × 9 mm thick is placed downward. Above, a fire block is placed just above the butt joint formed by the four JAS ordinary plywoods.

The fire type block is composed of white pine materials of 12 mm × 12 mm × 50 mm arranged at equal intervals, and is stacked in three steps so that the longitudinal directions of the white pine materials are alternately perpendicular to each other, and the shape is 50 × 50 ×. A block with a size of 36 mm was left in an environment of 23 ° C. and 50 RH% for 24 hours, and the weight was measured immediately before the test. .

After placing the fire type block at the predetermined position, air was flowed at a constant wind speed of 3 m / sec from below to above along the surface of the specimen, and the specimen was burned for 30 minutes. The area of the site 30 minutes post-combustion test specimens were burned by measuring a combustion area, ○ less than 4.5 cm ² / g to calculate the combustion area per spark block 1 g, × or more 4.5 cm ² / g It was evaluated.

Evaluation results The evaluation results are shown in Table 1.

Claims (2)

A moisture-curing urethane resin adhesive having a resin solid content of 50 to 90% by weight and a viscosity of 4.0 to 25.0 Pa · s / 25 ° C. is applied to the base at 0.3 to 0.5 kg / m ² and immediately Breathability in which a non-breathing layer is laminated on one side of a fibrous base material having a basis weight of 150 to 250 g / m ^{2 on} the coated surface, and a fibrous layer having a basis weight of 50 to 160 g / m ² is further laminated on the non-breathing layer. The breathable sheet body is disposed so that the fibrous base material surface of the sheet body comes into contact, and the unsaturated polyester resin is directly coated on the fiber layer of the breathable sheet body without applying a primer. An unsaturated polyester resin fiber reinforced resin layer is formed by further laminating a reinforcing material, and the unsaturated polyester resin fiber reinforced resin layer is composed of 2.5 to 6.0 g of unsaturated polyester resin per 1 g of fiber reinforcing material. Unsaturated polyester Waterproof finish structure, wherein the amount of resin is 1.2~5.0kg / ^{m 2.} A moisture-curing urethane resin adhesive having a resin solid content of 50 to 90% by weight and a viscosity of 4.0 to 25.0 Pa · s / 25 ° C. is applied to the base at 0.3 to 0.5 kg / m ² and immediately Breathability in which a non-breathing layer is laminated on one side of a fibrous base material having a basis weight of 150 to 250 g / m ^{2 on} the coated surface, and a fibrous layer having a basis weight of 50 to 160 g / m ² is further laminated on the non-breathing layer. The breathable sheet body is disposed so that the fibrous base material surface of the sheet body comes into contact, and the unsaturated polyester resin is directly coated on the fiber layer of the breathable sheet body without applying a primer. An unsaturated polyester resin fiber reinforced resin layer is formed by further laminating a reinforcing material, and the unsaturated polyester resin fiber reinforced resin layer is composed of 2.5 to 6.0 g of unsaturated polyester resin per 1 g of fiber reinforcing material. Unsaturated polyester Waterproof finish wherein the resin amount is 1.2~5.0kg / ^{m 2.}