JP2013199512A - Soft polyvinyl chloride-based thermal barrier coating material for waterproof sheet, coating film formed therefrom, and coating film-formed soft polyvinyl chloride-based waterproof sheet obtained by forming the coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal barrier coating material suppressing migration of a plasticizer in a sheet, and degradation due to ultraviolet rays, and excellent in thermal barrier performance; a coating film formed of the coating material; and a coating film-formed soft polyvinyl chloride-based waterproof sheet obtained by forming the coating film.SOLUTION: A thermal barrier coating material for coating a soft polyvinyl chloride-based waterproof sheet, comprises at least an ethylene-vinyl acetate copolymer emulsion, a silicone emulsion, an epoxy resin emulsion, titanium oxide, and hollow beads and/or silica particles. There are provided also a coating film formed with the coating, and a coating film-formed soft polyvinyl chloride-based waterproof sheet obtained by forming the coating film.

Description

  The present invention relates to a thermal barrier paint for coating on the surface of a soft polyvinyl chloride waterproof sheet, a coating film formed from the paint, and a coating film-forming soft polyvinyl chloride waterproof sheet formed by forming the coating film. About.

  Conventionally, a soft polyvinyl chloride waterproof sheet is usually laid on the roof or roof of a building. This type of waterproof sheet is laid mainly for the purpose of preventing inundation of rainwater and the like from the outside to the inside of the building and heat propagation. The waterproof sheet made of soft polyvinyl chloride is inexpensive, but when used for a long period of time, it deteriorates due to ultraviolet rays and cracks occur in the sheet, and the flexibility of the plasticizer contained in the waterproof sheet makes it flexible. It has the problem of being lowered. For this reason, an ultraviolet shielding material is included in the waterproof sheet to reduce crack generation and slow down the plasticizer volatilization rate (see, for example, Patent Document 1). Further, as another means for preventing the deterioration of the waterproof sheet, a method of forming a coating film on the surface of the waterproof sheet using a paint containing an ultraviolet shielding material such as titanium oxide is also known (for example, a patent) Reference 2).

  On the other hand, the surface layer of the waterproof sheet is laminated with a soft polyvinyl chloride-based synthetic film having a high reflection function, thereby suppressing an increase in the surface temperature of the waterproof sheet and heat propagation to the inside ( For example, see Patent Document 3).

JP 2000-007797 A JP-A-11-005938 Japanese Patent Application Laid-Open No. 08-049171

  However, the above known methods have the following problems. When an ultraviolet shielding material is contained in the soft vinyl chloride waterproof sheet, the content has an upper limit, and it is difficult to completely shield ultraviolet rays in direct sunlight. For this reason, in this method, only an effect of slowing the rate of aging of the waterproof sheet can be obtained. In addition, when a coating film containing an ultraviolet shielding material is formed on the surface layer of the waterproof sheet, since more ultraviolet shielding material can be contained, the ultraviolet shielding effect can be enhanced. The problem that the plasticizer migrates to the coating film remains, resulting in a decrease in flexibility of the waterproof sheet, deterioration of the sheet due to this, generation of cracks, and the like. Furthermore, there is a problem that dust or pollen adheres to the damaged portion of the sheet surface and the waterproof sheet progresses.

  In addition, when laminating a highly reflective soft polyvinyl chloride synthetic film, the solar reflectance is only about 80%, which is inferior to the thermal reflectance when compared with the solar reflectance when a thermal barrier coating is used.

  The present invention has been made in view of the above-described problem, and suppresses migration of a plasticizer and ultraviolet rays in a sheet, and has excellent heat shielding performance, a coating film formed from the coating, and It aims at providing the coating-film formation soft polyvinyl chloride type | system | group waterproof sheet which forms the said coating film.

  In order to achieve the above object, a thermal barrier paint for a soft polyvinyl chloride waterproof sheet according to one embodiment of the present invention is a thermal barrier paint for coating on a soft polyvinyl chloride waterproof sheet, and comprises ethylene-vinyl acetate. It contains at least a copolymer emulsion, a silicone emulsion, an epoxy resin emulsion, titanium oxide, hollow beads and / or silica particles.

  The coating film which concerns on another form which concerns on one form of this invention is formed in the surface of a soft polyvinyl chloride type | system | group waterproof sheet with said thermal insulation coating material for soft polyvinyl chloride type | mold waterproof sheets.

  The coating film which concerns on another form of this invention forms said coating film as a 50-350-micrometer-thick base coating film, and also on it, modified silicone resin emulsion and / or silicone modified acrylic resin emulsion, and 2- It has a multilayer structure in which an overcoat coating film formed from an overcoat paint containing at least butoxyethanol, titanium oxide, hollow beads and / or infrared reflective ceramic particles is formed with a thickness of 50 to 250 μm.

  The coating film-forming soft polyvinyl chloride waterproof sheet according to one embodiment of the present invention is formed by forming any one of the above-mentioned coating films on the surface of the soft polyvinyl chloride waterproof sheet.

  According to the present invention, it is possible to suppress the migration of the plasticizer of the soft polyvinyl chloride waterproof sheet to the outside of the sheet and ultraviolet deterioration, and to exhibit excellent heat shielding performance.

FIG. 1 shows a cross-sectional view in the thickness direction of a base coating film-formed soft polyvinyl chloride waterproof sheet formed by coating the base paint according to this embodiment on the surface of a soft polyvinyl chloride waterproof sheet. FIG. 2 shows a cross-sectional view in the thickness direction of a multilayer coating film-formed soft polyvinyl chloride waterproof sheet obtained by applying the overcoat paint according to this embodiment to the surface of the base coating film of FIG.

  Next, each implementation of the thermal insulation coating material for soft polyvinyl chloride waterproof sheets according to the present invention, the coating film formed thereby, and the coating film-forming soft polyvinyl chloride waterproof sheet formed by forming the coating film A form is demonstrated. However, the coating film will be described in the embodiment of the coating film-forming soft polyvinyl chloride waterproof sheet.

1. Thermal insulation coating for soft polyvinyl chloride waterproof sheet The thermal insulation coating for flexible polyvinyl chloride waterproof sheet (hereinafter simply referred to as “thermal insulation paint”) according to this embodiment is a soft polyvinyl chloride waterproof sheet. In addition to using a base paint for direct coating on the surface as an essential paint, an overcoat paint for painting on the surface of a base coating formed with the base paint is optionally included. Hereinafter, the constituent materials of the base paint and the overcoat paint will be described.

1.1 Base paint The base paint comprises (A) an ethylene-vinyl acetate copolymer emulsion, (B) a silicone emulsion, (C) an epoxy resin emulsion, (D) titanium oxide, (E) hollow beads and And / or silica particles. The content (mass%) of each material of (A) to (E) described below has a suitable range, but is selected within a range where the total amount of (A) to (E) is 100%. And

(A) Ethylene-vinyl acetate copolymer emulsion The ethylene-vinyl acetate copolymer emulsion in this embodiment is obtained by hydrophilizing ethylene-vinyl acetate copolymer resin microparticles with an emulsifier typified by a surfactant. The one dispersed in. The ethylene-vinyl acetate copolymer resin can be produced by radical copolymerization of ethylene and vinyl acetate under high temperature and high pressure. There are many types of ethylene-vinyl acetate copolymer resins depending on the content of vinyl acetate. The content of vinyl acetate is preferably 0.03 by mass ratio with respect to the ethylene-vinyl acetate copolymer resin. ~ 0.4.

  The ethylene-vinyl acetate copolymer emulsion contains a surfactant in addition to the ethylene-vinyl acetate copolymer resin. As the surfactant, anionic, cationic, amphoteric or nonionic surfactants can be exemplified, and among them, a nonionic surfactant can be suitably used. As the nonionic surfactant, polyoxyethylene alkyl ether, fatty acid diethanolamide and the like can be preferably used. The surfactant is preferably contained in the range of 3 to 13% by mass with respect to the mass of the ethylene-vinyl acetate copolymer resin. The average particle diameter measured by the laser method of the emulsion is preferably 2 μm or less, more preferably 0.1 to 1 μm.

  The ethylene-vinyl acetate copolymer emulsion is preferably contained in an amount of 35 to 60% by mass, more preferably 40 to 50% by mass, based on the total amount of the above (A) to (E) constituting the base paint. The ethylene-vinyl acetate copolymer resin component in the ethylene-vinyl acetate copolymer emulsion is preferably 20 to 80% by mass, more preferably 30 to 65% by mass with respect to the mass of the ethylene-vinyl acetate copolymer emulsion. is there. The amount of water in the ethylene-vinyl acetate copolymer emulsion is preferably determined so as to be in the mass range of the resin component. The ethylene-vinyl acetate copolymer emulsion may contain ethylene, vinyl acetate, and other monomers. Moreover, a pigment, a hardening | curing agent, dye, a filler, an antifoamer, a thickener, a flame retardant, a rust preventive agent etc. can also be added to ethylene-vinyl acetate copolymer emulsion.

(B) Silicone Emulsion The silicone emulsion in this embodiment is an aqueous emulsion in which a silicone oil having a linear polymer structure having a siloxane bond (O—Si—O) as the main chain is dispersed in water. And a surfactant and water. Examples of silicone oils in the emulsion include dimethyl silicone oil that binds only methyl groups to the side chains and terminals of polysiloxane, and phenyl groups that are bonded to some of the side chains of polysiloxane and other side chains and terminals. Methyl phenyl silicone oil that binds methyl groups, straight silicone oil typified by methyl hydrogen silicone oil that bonds hydrogen to some of the side chains of polysiloxane and binds methyl groups to other side chains and terminals In addition, a modified silicone oil in which an organic group is bonded to part of the side chain and / or terminal of polysiloxane can be exemplified. There are various types of modified silicone oils depending on the type of the organic group, such as amine-modified silicone oil, diamine-modified silicone oil, amino-modified silicone oil, epoxy-modified silicone oil, alicyclic epoxy-modified silicone oil, and carbinol-modified silicone. Oil, mercapto modified silicone oil, carboxyl modified silicone oil, amino / polyether modified silicone oil, epoxy / polyether modified silicone oil, epoxy / aralkyl modified silicone oil, polyether modified silicone oil, aralkyl modified silicone oil, fluoroalkyl modified silicone Oil, long chain alkyl-modified silicone oil, phenyl-modified silicone oil, phenol-modified silicone oil, methacryl-modified silicone N'oiru, silanol-modified silicone oil, diol-modified silicone oils and the like can be exemplified. Among the silicone oils, dimethylpolysiloxane is particularly preferable.

  In addition to the silicone oil, the silicone emulsion contains a surfactant that allows the silicone oil to be dispersed in water as an emulsion. As the surfactant, anionic, cationic, amphoteric or nonionic surfactants can be exemplified, and among them, a nonionic surfactant can be suitably used. As the nonionic surfactant, polyoxyethylene alkyl ether, fatty acid diethanolamide and the like can be preferably used. The surfactant is preferably contained in the range of 2 to 10% by mass with respect to the mass of the silicone oil. The average particle diameter measured by the laser method of the emulsion is preferably 10 μm or less, more preferably 2 μm or less. Pigments, dyes, fillers, antifoaming agents, thickeners, flame retardants, rust inhibitors and the like can also be added to the silicone emulsion.

  The silicone emulsion is preferably contained in an amount of 5 to 15% by mass, more preferably 6 to 10% by mass, based on the total amount of the above (A) to (E) constituting the base paint. The silicone oil in the silicone emulsion is preferably contained in an amount of 10 to 70% by mass, more preferably 15 to 50% by mass, based on the mass of the silicone emulsion.

(C) Epoxy resin emulsion An epoxy resin emulsion is obtained by hydrophilizing fine particles of an epoxy resin with an emulsifier typified by a surfactant and dispersing them in water. The epoxy resin emulsion suitably contains a curing agent. Examples of the curing agent include modified amines, polyfunctional phenols, imidazoles, mercaptans, and acid anhydrides.

  Examples of the epoxy resin include glycidyl ether type, glycidyl ester type, and glycidyl amine type. As glycidyl ether type epoxy resins, bisphenol A type, bisphenol F type, bisphenol bromide type, hydrogenated bisphenol A type, bisphenol S type, bisphenol AF type, biphenyl type, naphthalene type, fluorene type, phenol novolac type, cresol novolak type Type, DPP novolac type, tris-hydroxyphenylmethane type, and tetraphenylolethane type. Examples of the glycidyl ester type epoxy resin include hexahydrophthalic acid ester type and phthalic acid ester type. Examples of glycidylamine type epoxy resins include tetraglycidyl diaminodiphenylmethane type, triglycidyl isocyanurate type, hydantoin type, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane type, aminophenol type, aniline type, and toluidine type. Can be illustrated. The epoxy equivalent is preferably 150 to 250 g / eq.

  The epoxy resin emulsion contains a surfactant in addition to the epoxy resin. As the surfactant, anionic, cationic, amphoteric or nonionic surfactants can be exemplified, and among them, a nonionic surfactant can be suitably used. As the nonionic surfactant, polyoxyethylene alkyl ether, fatty acid diethanolamide and the like can be preferably used. The surfactant is preferably contained in the range of 3 to 13% by mass with respect to the mass of the epoxy resin. The average particle diameter measured by the laser method of the emulsion is preferably 10 μm or less, more preferably 0.1 to 1 μm.

  The epoxy resin emulsion is preferably contained in an amount of 5 to 15% by mass, more preferably 6 to 9% by mass, based on the total amount of the above (A) to (E) constituting the base paint. The epoxy resin component in the epoxy resin emulsion is preferably 20 to 80% by mass, more preferably 30 to 65% by mass, based on the mass of the epoxy resin emulsion. The amount of water in the epoxy resin emulsion is preferably determined so as to be in the mass range of the resin component. Pigments, dyes, fillers, antifoaming agents, thickeners, flame retardants, rust inhibitors and the like can also be added to the epoxy resin emulsion.

(D) Titanium oxide Titanium oxide is roughly classified into three types of crystal types: rutile type, anatase type, and brookite type. In this embodiment, the crystal type of titanium oxide used for the base paint is not limited to a specific crystal type, but is a rutile type having a relatively high ultraviolet shielding ability or a mixture of a rutile type and another crystal type. Is preferred. The form of titanium oxide may be any of a granular shape, a plate shape, and a needle shape. The average particle diameter measured by the laser method of titanium oxide is preferably 5 μm or less, more preferably 1 μm or less, and still more preferably 0.1 μm or less. Titanium oxide is preferably contained in an amount of 10 to 40% by mass, more preferably 15 to 25% by mass, based on the total amount of (A) to (E) constituting the base paint.

(E) Hollow beads and / or silica particles At least one of the hollow beads and silica particles according to this embodiment is added to the base paint. Hollow beads are outer particles of sodium silicate glass, aluminum silicate glass, borosilicate glass, carbon, alumina, or other ceramics, and are hollow particles containing air inside. High heat insulation effect due to air inside. Have Since the silica particles are excellent in infrared reflectivity, they are suitably added to the base paint together with the hollow beads or instead of the hollow beads.

  The average particle size measured by the laser method of the hollow beads is preferably 20 to 100 μm, more preferably 30 to 70 μm. However, when a smaller particle can be produced technically, the average particle size is smaller than 20 μm. Is preferred. The average particle | grains measured by the laser method of a silica particle becomes like this. Preferably it is 10 micrometers or less, More preferably, it is 1 micrometer or less. The silica particles may be produced either by a gas phase method or by a sol / gel method. The hollow beads and / or silica particles are preferably contained in an amount of 5 to 35% by mass, more preferably 10 to 20% by mass, based on the total amount of the above (A) to (E) constituting the base paint.

1.2 Overcoat paint The overcoat paint comprises (A) modified silicone resin emulsion and / or silicone modified acrylic resin emulsion, (B) 2-butoxyethanol, (C) titanium oxide, (D) hollow beads and And / or at least infrared-reflecting ceramic particles. The content (mass%) of each material of (A) to (D) described below has a suitable range, but is selected within a range where the total amount of (A) to (D) is 100%. And

(A) Modified silicone resin emulsion and / or silicone modified acrylic resin emulsion The modified silicone resin emulsion in this embodiment is obtained by hydrophilizing a modified silicone resin with an emulsifier represented by a surfactant and dispersing it in water. Say. The modified silicone resin has a form of a highly branched three-dimensional polymer, and the main skeleton of the molecular structure is a siloxane bond (O—Si—O) that forms a siloxane bond, but has a structure modified with other resins. Have. The number of siloxane bonds constituting the modified silicone resin is larger than that of silicone oil. Examples of the modified silicone resin include alkyd-modified silicone resin, epoxy-modified silicone resin, acrylic-modified silicone resin, and polyester-modified silicone resin.

  The modified silicone resin emulsion contains a surfactant in addition to the modified silicone resin. As the surfactant, anionic, cationic, amphoteric or nonionic surfactants can be exemplified, and among them, a nonionic surfactant can be suitably used. As the nonionic surfactant, polyoxyethylene alkyl ether, fatty acid diethanolamide and the like can be preferably used. The surfactant is preferably contained in the range of 3 to 13% by mass with respect to the mass of the modified silicone resin. The average particle diameter measured by the laser method of the emulsion is preferably 2 μm or less, more preferably 0.1 to 1 μm.

  The silicone-modified acrylic resin emulsion in this embodiment refers to a silicone-modified acrylic resin that has been hydrophilized with an emulsifier typified by a surfactant and dispersed in water. The silicone-modified acrylic resin is a resin obtained by modifying a part of the acrylic resin with silicone. The acrylic resin is preferably a resin obtained by polymerizing one or more selected from acrylic acid, acrylic acid ester, methacrylic acid, and methacrylic acid ester.

  The silicone-modified acrylic resin emulsion contains a surfactant in addition to the silicone-modified acrylic resin. As the surfactant, anionic, cationic, amphoteric or nonionic surfactants can be exemplified, and among them, a nonionic surfactant can be suitably used. As the nonionic surfactant, polyoxyethylene alkyl ether, fatty acid diethanolamide and the like can be preferably used. The surfactant is preferably contained in the range of 3 to 13% by mass with respect to the mass of the silicone-modified acrylic resin. The average particle diameter measured by the laser method of the emulsion is preferably 2 μm or less, more preferably 0.1 to 1 μm.

  The modified silicone resin emulsion and the silicone-modified acrylic resin emulsion are preferably used with respect to the total amount of the above (A) to (D) constituting the overcoat paint, regardless of whether only one of them or both of them are used. 40-60 mass%, More preferably, 45-55 mass% is contained. The modified silicone resin and / or the silicone-modified acrylic resin component in the modified silicone resin emulsion and / or silicone-modified acrylic resin emulsion is preferably 20 to 80 mass with respect to the mass of the modified silicone resin emulsion and / or silicone-modified acrylic resin emulsion. %, More preferably 30 to 65% by mass. The amount of water in the modified silicone resin emulsion and / or silicone-modified acrylic resin emulsion is preferably determined so as to be in the mass range of the resin component. In the emulsion, pigments, curing agents, dyes, fillers, antifoaming agents, thickeners, flame retardants, rust inhibitors, and the like can be added.

(B) 2-Butoxyethanol 2-Butoxyethanol, also called ethylene glycol monobutyl ether, is a compound that functions as a film-forming aid for overcoat paints. 2-Butoxyethanol is preferably contained in an amount of 1 to 15% by mass, more preferably 2 to 10% by mass, based on the total amount of the above (A) to (D) constituting the overcoat paint.

(C) Titanium oxide As the titanium oxide in the base paint, those containing a rutile type crystal form are preferable, and any form of particles, plates, and needles may be used. The average particle diameter measured by the laser method of titanium oxide is preferably 5 μm or less, more preferably 1 μm or less, and still more preferably 0.1 μm or less. Titanium oxide is preferably contained in an amount of 10 to 30% by mass, more preferably 15 to 25% by mass, based on the total amount of the above (A) to (D) constituting the overcoat paint.

(D) Hollow beads and / or infrared reflective ceramic particles The hollow beads are the same as the hollow beads that can be included in the base paint. The infrared reflective ceramic particles are preferably an oxide containing at least one element selected from alkaline earth metals, chromium, manganese, iron, copper and rare earth elements, for example, chromium oxide, copper chromium composite Oxide, iron chromium composite oxide, cobalt iron chromium composite oxide, copper chromium manganese composite oxide, calcium manganese composite oxide, barium manganese composite oxide, yttrium manganese oxide, lanthanum manganese oxide, strontium manganese oxide, Examples thereof include neodymium manganese oxide, bismuth copper oxide, and copper oxide. Infrared reflective ceramic particles obtained by coating the surface of the oxide with an organosilicon compound, an organometallic compound, a polyol, an alkanolamine or a derivative thereof, a higher fatty acid or a metal salt thereof, a higher hydrocarbon or a derivative thereof Can also be used.

  The average particle size of the hollow beads and / or infrared reflective ceramic particles measured by the laser method is preferably 20 to 100 μm, more preferably 30 to 70 μm. However, if technically smaller particles can be produced, the average particle is 20 μm or more. What has a small average particle diameter is preferable, The average particle | grains measured by the laser method of an infrared reflective ceramic particle are preferably 10 micrometers or less, More preferably, it is 1 micrometer or less. The hollow beads and / or infrared reflective ceramic particles are preferably contained in an amount of 10 to 30% by mass, more preferably 15 to 25% by mass, based on the total amount of the above (A) to (D) constituting the overcoat paint.

2. Film-forming soft polyvinyl chloride waterproof sheet A film-forming soft polyvinyl chloride waterproof sheet according to this embodiment is a base film-forming soft polyvinyl chloride coated with a base paint on the surface of a soft polyvinyl chloride waterproof sheet. It is divided into a vinyl-based waterproof sheet and a multi-layer coating film-forming soft polyvinyl chloride waterproof sheet in which an overcoat paint is further applied to the surface of the base coating film. Hereinafter, these will be described separately.

2.1 Base coating film forming soft polyvinyl chloride waterproof sheet FIG. 1 shows a base coating film forming soft polyvinyl chloride sheet formed by coating the base paint according to this embodiment on the surface of a soft polyvinyl chloride waterproof sheet. Sectional drawing of the thickness direction of a waterproof sheet is shown.

  A base coating film forming soft polyvinyl chloride waterproof sheet 1 is formed by forming a base coating film 3 on the surface of a soft polyvinyl chloride waterproof sheet 2. The base coating film 3 is a coating film having a thickness of 10 to 500 μm, preferably a thickness of 50 to 350 μm, in which water in the base coating is volatilized and solid components such as a resin in the base coating are solidified. It is. In order to form the base coating film 3 having a desired thickness, only one coating may be performed, or two or more overcoatings may be performed. The painting may be performed by any means such as spray painting, painting with a brush, painting with a roller, or the like. The base coating film 3 has at least solid components such as an ethylene-vinyl acetate copolymer resin, an epoxy resin, titanium oxide, hollow beads, and / or silica particles. The resin in the base coating film 3 effectively reduces the migration of the plasticizer from the soft polyvinyl chloride waterproof sheet 1 to the base coating film 3 side. For this reason, the base coating film-forming soft polyvinyl chloride waterproof sheet 1 can maintain flexibility even when used for a long time. Moreover, since the titanium oxide in the base coating film 3 has an ultraviolet shielding ability, the ultraviolet degradation of the soft polyvinyl chloride waterproof sheet 2 can be suppressed. Furthermore, since the hollow beads and / or silica particles in the base coating film 3 exhibit a heat insulation function and / or an infrared reflection function, heat propagation to the soft polyvinyl chloride waterproof sheet 2 is effectively suppressed.

2.2 Overcoat coating film forming soft polyvinyl chloride waterproof sheet FIG. 2 shows a multilayer coating film forming soft polyvinyl chloride obtained by applying the overcoat paint according to this embodiment to the surface of the base coating film of FIG. Sectional drawing of the thickness direction of a system waterproof sheet is shown.

  The multilayer coating film-forming soft polyvinyl chloride waterproof sheet 10 is formed by forming a base coating film 3 on the surface of the soft polyvinyl chloride waterproof sheet 2 and forming an overcoat coating film on the surface. A multilayer coating film 4 is formed by the base coating film 3 and the overcoat coating film. The overcoat film is a film having a thickness of 50 to 250 μm, preferably 100 to 200 μm, and the moisture in the overcoat paint is volatilized and solid components such as a resin in the overcoat paint are solidified. It is a thing. In order to form an overcoat coating film having a desired thickness, only one coating may be performed, and two or more overcoatings may be performed. The painting may be performed by any means such as spray painting, painting with a brush, painting with a roller, or the like. The overcoat coating film has at least solid components such as a modified silicone resin and / or a silicone-modified acrylic resin, titanium oxide, hollow beads, and / or infrared reflective ceramic particles. Since titanium oxide in the overcoat coating film has an ultraviolet shielding ability, the ultraviolet degradation of the soft polyvinyl chloride waterproof sheet 2 can be suppressed. Furthermore, since the hollow beads and / or infrared reflective ceramic particles in the overcoat coating film exhibit a heat insulating function and / or an infrared reflective function, heat propagation to the soft polyvinyl chloride waterproof sheet 2 is effectively suppressed.

  Next, examples of the present invention will be described.

1. 1. Raw material of thermal barrier paint 1.1 The raw material of the base paint as the thermal barrier paint used in the examples of the present invention is as follows.
(1) Ethylene-vinyl acetate copolymer emulsion Sumikaflex 520HQ (product name) manufactured by Sumitomo Chemical Co., Ltd. was used as the ethylene-vinyl acetate copolymer emulsion.
(2) Silicone emulsion MRX-2269 (product name) manufactured by Asahi Chemical Industry Co., Ltd. was used as the silicone emulsion.
(3) Epoxy resin emulsion Epoxy cloth WS-500 (product name) manufactured by Nippon Shokubai Co., Ltd. was used as the epoxy resin emulsion.
(4) Titanium oxide JR600 (product name) manufactured by Teika Co., Ltd. was used as the titanium oxide.
(5) Silica Silica spherical fine particles made by Nippon Steel Materials Co., Ltd. were used for silica.

1.2 The raw materials for the overcoat paint as the thermal barrier paint used in the examples of the present invention are as follows.
(1) Modified silicone resin emulsion As the modified silicone resin emulsion, an emulsion manufactured by Toray Dow Corning Co., Ltd. was used.
(2) Silicone-modified acrylic resin emulsion As a silicone-modified acrylic resin emulsion, Boncoat (product name) manufactured by DIC Corporation was used.
(3) 2-Butoxyethanol As 2-butoxyethanol, butyl cellosolve (product name) manufactured by Cosmo Oil Chemical Co., Ltd. was used.
(4) Titanium oxide The same titanium oxide as that used for the base paint was used.
(5) Infrared reflective ceramic particles As the ceramic particles, the same silica as that used for the base paint was used.

2. Experiment 2.1 Experiment Example 1
(1) Preparation of base paint 47 parts by mass of ethylene-vinyl acetate copolymer emulsion, 8 parts by mass of silicone emulsion, 7 parts by mass of epoxy resin emulsion, 17 parts by mass of titanium oxide, 17 parts by mass of silica, and 4 parts by mass of solvent (purified water) The base paint which is one of the thermal barrier paints was prepared by mixing the parts.
(2) Formation of base coating film on soft polyvinyl chloride waterproof sheet Using the above base paint on the surface of a soft polyvinyl chloride waterproof sheet (1.5 mm thick) manufactured by Ron Seal Industry Co., Ltd. The first coating was applied at a thickness of about 150 μm, and after drying, the second coating was applied again at a thickness of about 150 μm using a base paint to form a base coating film having a thickness of about 300 μm. .
(3) Evaluation The transition of the plasticizer from the base coating film to the coating film side was examined by palpation, but no plasticizer migration was observed. In addition, the plasticizer migration was examined regularly throughout the year, but no migration was observed. The solar reflectance of the coating film was measured in accordance with JIS K 5675 using a spectrophotometer, and as a result, it was 91.2% in the near infrared region in the white standard, and reached a passing level of 90% or more.

2.2 Experimental example 2
(1) Preparation of overcoat paint 5 parts by mass of modified silicone resin emulsion, 50 parts by mass of silicone-modified acrylic resin emulsion, 3 parts by mass of 2-butoxyethanol, 18 parts by mass of titanium oxide, 18 parts by mass of infrared reflecting ceramic particles and solvent (purification Water) 5 parts by mass were mixed to prepare an overcoat paint which is one of the thermal barrier paints.
(2) Formation of base coating film and overcoat coating film on soft polyvinyl chloride waterproof sheet An experiment was conducted on the surface of a flexible polyvinyl chloride waterproof sheet (1.5 mm thick general-purpose product) manufactured by Ron Seal Industry Co., Ltd. A base coating film having a thickness of about 300 μm was formed in the same manner as in Example 1. Thereafter, coating was performed at a thickness of about 150 μm using the overcoat paint to form a coating film (multilayer coating film) having a thickness of about 450 μm.
(3) Evaluation The solar reflectance (including ultraviolet reflectance) of the multilayer coating film was measured based on JIS K 5602 using a spectrophotometer, and as a result, the near infrared region was 90.7% in the white standard. , Passed the level of 90% or more. In addition, the retention ratio of solar reflection performance in the outdoor exposure test of the multilayer coating film was 91.8%. The multilayer coating film had an ultraviolet reflectance of less than 10% in the white standard, but an ultraviolet transmittance of less than 5%. From this, the ultraviolet ray which permeate | transmits a multilayer coating film and reaches a soft polyvinyl chloride type | system | group waterproof sheet is very little, and the big inhibitory effect of ultraviolet-ray deterioration was recognized.

  INDUSTRIAL APPLICABILITY The present invention can be used as a heat island countermeasure, a heat shielding countermeasure paint on the top floor of buildings, condominiums, etc., a coating film using the coating material, and a soft polyvinyl chloride waterproof sheet on which the coating film is formed. .

1 Base film forming soft polyvinyl chloride waterproof sheet (Example of film forming soft polyvinyl chloride waterproof sheet)
2 Soft polyvinyl chloride waterproof sheet 3 Base coating (an example of coating)
4 Multi-layer coating film (an example of coating film)
10 Multi-layer coating film forming soft polyvinyl chloride waterproof sheet (an example of coating film forming soft polyvinyl chloride waterproof sheet)

Claims (4)

A thermal barrier paint for coating on a soft polyvinyl chloride waterproof sheet,
An ethylene-vinyl acetate copolymer emulsion;
Silicone emulsion,
An epoxy resin emulsion;
Titanium oxide,
Hollow beads and / or silica particles;
Thermal insulation coating material for soft polyvinyl chloride waterproof sheet containing at least   The coating film formed on the surface of a soft polyvinyl chloride type | system | group waterproof sheet with the thermal-insulation coating material for soft polyvinyl chloride type | mold waterproof sheets of Claim 1. The coating film according to claim 2 is formed as a base coating film having a thickness of 50 to 350 μm,
On top of that,
A modified silicone resin emulsion and / or a silicone modified acrylic resin emulsion;
2-butoxyethanol;
Titanium oxide,
Hollow beads and / or infrared reflective ceramic particles;
The coating film which has a multilayer structure formed by forming the overcoat coating film formed from the overcoat coating material containing at least 50-250 micrometers in thickness.   A film-forming soft polyvinyl chloride waterproof sheet comprising the coating film of any one of claims 2 and 3 formed on a surface of a soft polyvinyl chloride waterproof sheet.

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