JP2008303650A - Roof coated with elastic coating material and coating film obtained by hardening elastic coating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roof coated with an elastic coating material having an excellent hardening property of a coating film under a low temperature and high humidity environment, and low VOC (volatile organic compound) and low contamination properties, and to provide the coating film obtained by hardening the elastic coating material. <P>SOLUTION: The roof has a coating film on the surface, of which the coating film is obtained by hardening the non-water and non-solvent-based elastic coating material containing (A) an organic polymer having a silicon-containing group capable of cross-linking by forming a siloxane bond. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an organic polymer having a silicon-containing group (hereinafter also referred to as “reactive silicon group”) having a hydroxyl group or a hydrolyzable group bonded to a silicon atom and capable of crosslinking by forming a siloxane bond. And a coating film formed by curing the elastic paint.

  An organic polymer containing at least one reactive silicon group in the molecule is crosslinked at room temperature by forming a siloxane bond accompanied by a hydrolysis reaction of the reactive silicon group due to moisture, etc. It is known to have the property of being obtained.

  Among these polymers having a reactive silicon group, organic polymers whose main chain skeleton is a polyoxyalkylene polymer or vinyl polymer are disclosed in (Patent Document 1) and (Patent Document 2) as coating agents. The use as is disclosed.

  On the other hand, as a water-based elastic paint, an elastic paint using an acrylic emulsion is widely used as described in (Patent Document 3), but it takes a long time to form a coating film under low temperature or high humidity. There was a problem. In addition, as described in (Patent Document 3), there is a case in which a problem of water resistance is pointed out.

  As the non-aqueous elastic paint, a urethane-based elastic paint is used. However, since it has a high viscosity, a relatively large amount of solvent needs to be added, which causes a problem of VOC (volatile organic compound) generation.

  As other elastic paints, silicone-based elastic paints have been developed, but there is a problem of contamination, and particularly when used for roofs, problems such as dust adhesion occur.

As described above, the present situation is that an elastic coating material that satisfies all of good curability under low temperature and high humidity, low VOC, and low contamination (small dust adhesion) has not been developed yet.
Japanese Patent Laid-Open No. 5-65454 JP-A-11-130931 JP-A-10-298488

  The present invention provides a painted roof or paint film coated with an elastic paint, which has good paint curability under low temperature and high humidity, low VOC, and low contamination. For the purpose.

  As a result of intensive studies to solve the above problems, the present inventor has used a non-aqueous and non-solvent elastic paint mainly composed of an organic polymer (A) having a reactive silicon group. The present invention has been completed by finding that a coated roof or coating film having good film curability under humidity, low VOC, and low contamination can be obtained.

That is, the present invention
A non-aqueous and non-solvent system comprising an organic polymer (A) having a silicon-containing group that can be cross-linked by forming a siloxane bond in a roof having a coating film formed on the outermost layer in contact with the outside air The present invention relates to a roof made by curing an elastic paint.
The main chain skeleton of the organic polymer (A) is preferably a polyoxyalkylene polymer (A1) or a (meth) acrylic acid ester polymer (A2).
The main chain skeleton of the organic polymer (A) is preferably a polyoxyalkylene polymer (A1) and a (meth) acrylic acid ester polymer (A2).
The main chain skeleton of the polyoxyalkylene polymer (A1) is preferably polypropylene oxide.
The main chain skeleton of the (meth) acrylate polymer (A2) is preferably an acrylate polymer.
The main chain skeleton of the (meth) acrylate polymer (A2) is preferably a polymer produced by a living radical polymerization method.
The main chain skeleton of the (meth) acrylate polymer (A2) is preferably a polymer produced by an atom transfer radical polymerization method.
The elastic paint is preferably a one-pack type elastic paint.
The thickness of the coating film formed by curing the elastic paint is preferably 0.1 mm to 2 mm.

  The painted roof or coating film of the present invention exhibits good coating curability under low temperature and high humidity, low VOC, and low contamination.

  The present invention will be described in detail below.

  The elastic paint used in the present invention is required to contain a non-aqueous and non-solvent organic polymer (A) having a reactive silicon group.

  In the present invention, the non-water-based elastic paint is defined as having a water content of 10% or less in the weight of the elastic paint, and the non-solvent elastic paint is a content of the organic solvent in the weight of the elastic paint being 10%. % Or less.

  The ratio of the water content in the elastic paint to the organic polymer (A) as the main component of the elastic paint is important, and is preferably 10 parts by weight or less with respect to 100 parts by weight of the organic polymer (A). 1 part by weight or less is more preferable, and 0.1 part by weight or less is still more preferable. In particular, when the elastic paint is a one-pack type, it is preferably 0.1 parts by weight or less, and most preferably contains substantially no water. If the water content exceeds this range, the storage stability tends to decrease, and the physical properties of the coating film may decrease.

  In addition, the content of the organic solvent in the elastic paint is important in a ratio with respect to the organic polymer (A) which is the main component of the elastic paint, and is 10 parts by weight or less with respect to 100 parts by weight of the organic polymer (A). Preferably, 5 parts by weight or less is more preferable, 1 part by weight or less is more preferable, 0.1 part by weight or less is particularly preferable, and it is most preferable that the content is not substantially contained. When the content of the organic solvent exceeds this range, the amount of VOC generated during the formation of the coating film tends to increase, and the load on the environment tends to increase.

  In addition, the elastic paint used in the present invention is preferably a one-pack type because of the ease of construction, the absence of deterioration in coating film performance due to mixing failure or mixing error, and the like.

Moreover, it is preferable that the coating film obtained by curing the elastic coating used in the present invention has a low modulus and a high elongation property in order to ensure the followability to the movement of the ground or the crack due to the temperature difference.
The physical properties of the coating film obtained by curing the elastic paint used in the present invention are preferably 50 MPa tensile stress of 0.1 MPa to 3 MPa, and 0.2 MPa to 1.5 MPa, as measured according to ASTM D2370. It is more preferable that it is 0.3MPa-1MPa. If the 50% tensile stress is below this range, the residual tack of the coating film tends to increase and dust adhesion tends to increase. When the 50% tensile stress exceeds this range, the coating film tends to be brittle with low elongation, and the followability of the coating film to the movement of the base tends to be reduced.
Further, the elongation at break of the coating film is preferably 50% or more, more preferably 100% or more, and particularly preferably 150% or more. If the elongation at break is below this range, the coating film is brittle and the followability of the coating film to the movement of the base tends to be reduced.

  In addition, although there is no limitation in particular as a base | substrate at the time of applying the elastic paint used for this invention, a waterproof sheet which consists of asphalt, modified bitumen, EPDM, etc., polyethylene foam, polystyrene foam, polyurethane foam, etc. Organic bases such as foamed plastic insulation, lightweight mortar, lightweight concrete, calcium silicate board, siding board, gypsum board, slate board, concrete, mortar, slate, ALC board, metal, etc. .

  The thickness of the coating film obtained by curing the elastic paint used in the present invention is preferably 0.1 mm to 2 mm, more preferably 0.2 mm to 1.5 mm, and 0.3 mm to 1 mm. It is particularly preferred. When the thickness of the coating film is below this range, the water permeability and water resistance of the coating film tend to decrease. If the thickness of the coating film exceeds this range, it takes a long time to form the coating film and tends to be expensive.

  The roof of the present invention is a roof covered with a coating film obtained by curing the paint.

Here, the roof is a structure that covers the top of the building. Roofs of vehicles such as automobiles and trains are included in the roof of the present invention as well as roofs of all buildings such as detached houses, buildings, factories, and public facilities.
There are no particular restrictions on the shape of the roof, but there are flat roofs, gables, dormitories, main building, mansard roofs, roller, single-flow saw roofs, M-shaped roofs, butterflies, domes, spires, vaults, aussies, round roofs, etc. It is done.

  The method for applying the elastic paint is not particularly limited, but can be performed by a known application method such as a brush, a roller, an air spray, or an airless spray, as described in JP-A-10-298488.

  The main chain skeleton of the organic polymer (A) having a reactive silicon group used in the present invention is not particularly limited. Specifically, polyoxyethylene, polyoxypropylene, polyoxybutylene, polyoxytetramethylene, polyoxy Polyoxyalkylene polymers such as ethylene-polyoxypropylene copolymer, polyoxypropylene-polyoxybutylene copolymer; ethylene-propylene copolymer, polyisobutylene, copolymers of isobutylene and isoprene, poly It is obtained by hydrogenating chloroprene, polyisoprene, isoprene or a copolymer of butadiene and acrylonitrile and / or styrene, polybutadiene, isoprene or a copolymer of butadiene and acrylonitrile, styrene, or the like, and these polyolefin polymers. Hydrogenated Hydrocarbon polymers such as reolefin polymers; polyester polymers obtained by condensation of dibasic acids such as adipic acid and glycols or ring-opening polymerization of lactones; ethyl (meth) acrylate, butyl ( (Meth) acrylate polymers obtained by radical polymerization of monomers such as (meth) acrylate; vinyl polymers obtained by radical polymerization of monomers such as (meth) acrylate monomers, vinyl acetate, acrylonitrile and styrene Polymer; Graft polymer obtained by polymerizing vinyl monomer in the organic polymer; Polysulfide polymer; Nylon 6 by ring-opening polymerization of ε-caprolactam; Nylon 6 by condensation polymerization of hexamethylenediamine and adipic acid・ 6 、 Nylon 6 by condensation polymerization of hexamethylenediamine and sebacic acid 10, polyamide 11 such as nylon 11 by condensation polymerization of ε-aminoundecanoic acid, nylon 12 by ring-opening polymerization of ε-aminolaurolactam, copolymer nylon having two or more components among the above nylons; Examples include polycarbonate polymers and diallyl phthalate polymers produced by condensation polymerization from bisphenol A and carbonyl chloride. Among these, saturated hydrocarbon polymers such as polyisobutylene, hydrogenated polyisoprene, and hydrogenated polybutadiene, polyoxyalkylene polymers, and (meth) acrylate polymers have relatively low glass transition temperatures, The obtained coating film is more preferable because it is excellent in cold resistance.

  The glass transition temperature of the organic polymer (A) is not particularly limited, but is preferably 20 ° C. or lower, more preferably 0 ° C. or lower, and particularly preferably −20 ° C. or lower. When the glass transition temperature exceeds 20 ° C., the viscosity in winter or in a cold region may increase and workability may deteriorate, and the flexibility of the coating film may decrease and elongation may decrease. The glass transition temperature is a value measured by DSC.

  In addition, the polyoxyalkylene polymer (A1) and the (meth) acrylic acid ester polymer (A2) have high moisture permeability and are excellent in coating film formation speed even when a one-pack type elastic coating material is used, and further have an adhesive property. Also excellent. In particular, the polyoxyalkylene polymer (A1) is particularly preferable because it can reduce the viscosity of the elastic paint, and further forms a coating film having high elongation, high strength, and relatively little residual tack. The (meth) acrylic acid ester polymer (A2) is particularly preferable because it forms a coating film having excellent weather resistance and chemical resistance.

The reactive silicon group contained in the organic polymer having a reactive silicon group has a hydroxyl group or hydrolyzable group bonded to a silicon atom, and forms a siloxane bond by a reaction accelerated by a silanol condensation catalyst. It is a group that can be crosslinked by
As the reactive silicon group, the general formula (1):
-SiR ¹ _3-a X _a (1)
Wherein R ¹ is an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, or (R ′) ₃ SiO— (R ′ is Each independently represents a triorganosiloxy group represented by a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms, and X is independently a hydroxyl group or a hydrolyzable group. And a is any one of 1, 2, and 3).

  It does not specifically limit as a hydrolysable group, What is necessary is just a conventionally well-known hydrolysable group. Specific examples include a hydrogen atom, a halogen atom, an alkoxy group, an acyloxy group, a ketoximate group, an amino group, an amide group, an acid amide group, an aminooxy group, a mercapto group, and an alkenyloxy group. Among these, a hydrogen atom, an alkoxy group, an acyloxy group, a ketoximate group, an amino group, an amide group, an aminooxy group, a mercapto group, and an alkenyloxy group are preferable. Particularly preferred.

  Hydrolyzable groups and hydroxyl groups can be bonded to one silicon atom in the range of 1 to 3, and 2 or 3 is preferable from the viewpoint of curability. When two or more hydrolyzable groups or hydroxyl groups are bonded to the silicon atom, they may be the same or different. A reactive silicon group having three hydroxyl groups or hydrolyzable groups on a silicon atom has high activity and good curability, and is excellent in the resilience, durability and creep resistance of the resulting coating film. This is preferable. On the other hand, a reactive silicon group having two hydroxyl groups or hydrolyzable groups on a silicon atom is preferable because it is excellent in storage stability and the obtained coating film has high elongation and high strength.

Specific examples of R ¹ in the general formula (1) include, for example, an alkyl group such as a methyl group and an ethyl group, a cycloalkyl group such as a cyclohexyl group, an aryl group such as a phenyl group, an aralkyl group such as a benzyl group, Examples thereof include a triorganosiloxy group represented by (R ′) ₃ SiO— in which R ′ is a methyl group, a phenyl group or the like. Of these, a methyl group is particularly preferred.

  More specific examples of the reactive silicon group include a trimethoxysilyl group, a triethoxysilyl group, a triisopropoxysilyl group, a dimethoxymethylsilyl group, a diethoxymethylsilyl group, and a diisopropoxymethylsilyl group. A trimethoxysilyl group, a triethoxysilyl group, and a dimethoxymethylsilyl group are more preferable, and a trimethoxysilyl group is particularly preferable because of high activity and good curability. In addition, a dimethoxymethylsilyl group is particularly preferable from the viewpoint of storage stability. Further, triethoxysilyl group and diethoxymethylsilyl group are particularly preferable because the alcohol produced by the hydrolysis reaction of the reactive silicon group is ethanol and has higher safety.

  Introduction of the reactive silicon group may be performed by a known method. That is, the following method etc. are mentioned.

(B) An organic polymer having an unsaturated group is reacted with an organic polymer having a functional group such as a hydroxyl group in the molecule by reacting an organic compound having an active group and an unsaturated group reactive to the functional group. Get coalesced. Alternatively, an unsaturated group-containing organic polymer is obtained by copolymerization with an unsaturated group-containing epoxy compound. Next, the reaction product obtained is hydrosilylated by allowing hydrosilane having a reactive silicon group to act.

(B) A method of reacting a compound having a mercapto group and a reactive silicon group with an organic polymer containing an unsaturated group obtained in the same manner as in the method (a).

(C) A method in which an organic polymer having a functional group such as a hydroxyl group, an epoxy group or an isocyanate group in a molecule is reacted with a compound having a reactive functional group and a reactive silicon group.

  Among the above methods, the method (a) or the method (c) of reacting a polymer having a hydroxyl group at the terminal with a compound having an isocyanate group and a reactive silicon group is high in a relatively short reaction time. It is preferable because a conversion rate can be obtained. Furthermore, the organic polymer having a reactive silicon group obtained by the method (a) becomes an elastic paint having a lower viscosity and better workability than the organic polymer obtained by the method (c). Since the organic polymer obtained by the method (b) has a strong odor based on mercaptosilane, the method (a) is particularly preferred.

Specific examples of the hydrosilane compound used in the method (a) include halogenated silanes such as trichlorosilane, methyldichlorosilane, dimethylchlorosilane, and phenyldichlorosilane; trimethoxysilane, triethoxysilane, and methyldiethoxysilane. , Methyldimethoxysilane, phenyldimethoxysilane, alkoxysilanes such as 1- [2- (trimethoxysilyl) ethyl] -1,1,3,3-tetramethyldisiloxane; methyldiacetoxysilane, phenyldiacetoxysilane Examples thereof include, but are not limited to, acyloxysilanes such as: ketoximate silanes such as bis (dimethylketoximate) methylsilane and bis (cyclohexylketoximate) methylsilane. Of these, halogenated silanes and alkoxysilanes are particularly preferable. Particularly, alkoxysilanes are most preferable because the resulting elastic coating has a mild hydrolyzability and is easy to handle. Among the alkoxysilanes, methyldimethoxysilane is particularly preferable because it is easily available and the elastic coating material containing the obtained organic polymer has high curability, storage stability, elongation characteristics, and tensile strength. Trimethoxysilane is particularly preferred from the viewpoint of curability and resilience of the resulting elastic paint.

As a synthesis method of (b), for example, a compound having a mercapto group and a reactive silicon group is converted into an unsaturated bond site of an organic polymer by a radical addition reaction in the presence of a radical initiator and / or a radical generation source. Although the method of introduce | transducing etc. is mentioned, it does not specifically limit. Specific examples of the compound having a mercapto group and a reactive silicon group include, for example, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropyltriethoxysilane, and γ-mercaptopropylmethyldiethoxy. Examples include, but are not limited to, silane, mercaptomethyltrimethoxysilane, mercaptomethyltriethoxysilane, and the like.

As a method of reacting a polymer having a hydroxyl group at the terminal with a compound having an isocyanate group and a reactive silicon group in the synthesis method (c), for example, the method described in JP-A-3-47825 can be mentioned. However, it is not particularly limited. Specific examples of the compound having an isocyanate group and a reactive silicon group include, for example, γ-isocyanatopropyltrimethoxysilane, γ-isocyanatopropylmethyldimethoxysilane, γ-isocyanatepropyltriethoxysilane, and γ-isocyanatepropylmethyldiethoxy. Examples include, but are not limited to, silane, isocyanate methyltrimethoxysilane, isocyanatemethyltriethoxysilane, isocyanatemethyldimethoxymethylsilane, and isocyanatemethyldiethoxymethylsilane.

  A silane compound in which three hydrolyzable groups are bonded to one silicon atom such as trimethoxysilane may undergo a disproportionation reaction. As the disproportionation reaction proceeds, dangerous compounds such as dimethoxysilane and tetrahydrosilane are formed. However, such disproportionation reaction does not proceed with γ-mercaptopropyltrimethoxysilane or γ-isocyanatopropyltrimethoxysilane. Therefore, when a group in which three hydrolyzable groups such as trimethoxysilyl group are bonded to one silicon atom is used as the silicon-containing group, the synthesis method (b) or (c) may be used. preferable.

On the other hand, the general formula (2):
H- (SiR ² ₂ O) _m SiR ² ₂ -R ³ -SiX ₃ (2)
(In the formula, X is the same as above. 2 × m + 2 R ^{2 s} are each independently a hydrocarbon group or —OSi (R ″) ₃ (R ″ is independently from 1 carbon atom) And a hydrocarbon group having 1 to 20 carbon atoms, and from the viewpoint of availability and cost, it is preferably 1 to 8 carbon atoms. The hydrocarbon group is more preferably a hydrocarbon group having 1 to 4 carbon atoms, and R ³ is a divalent organic group, and is divalent having 1 to 12 carbon atoms from the viewpoint of availability and cost. A divalent hydrocarbon group having 2 to 8 carbon atoms is more preferable, and a divalent hydrocarbon group having 2 carbon atoms is particularly preferable, and m is an integer of 0 to 19. 1 is preferable from the viewpoint of availability and cost) The disproportionation reaction does not proceed with the silane compound represented by For this reason, when a group in which three hydrolyzable groups are bonded to one silicon atom is introduced by the synthesis method (a), the silane compound represented by the general formula (2) should be used. Is preferred.

  Specific examples of the silane compound represented by the general formula (2) include 1- [2- (trimethoxysilyl) ethyl] -1,1,3,3-tetramethyldisiloxane, 1- [2- (trimethoxy Silyl) propyl] -1,1,3,3-tetramethyldisiloxane, 1- [2- (trimethoxysilyl) hexyl] -1,1,3,3-tetramethyldisiloxane.

  The organic polymer having a reactive silicon group may be linear or branched, and its number average molecular weight is about 500 to 100,000 in terms of polystyrene in GPC, more preferably 1,000 to 50,000. And particularly preferably 3,000 to 30,000. If the number average molecular weight is less than 500, the coating film tends to be disadvantageous in terms of elongation characteristics, and if it exceeds 100,000, the viscosity tends to be inconvenient because of high viscosity.

  In order to obtain a rubber-like coating film having high strength, high elongation and low elastic modulus, the average number of reactive silicon groups contained in the organic polymer is at least 1, preferably 1, It is good to have 1-5 pieces. When the number of reactive silicon groups contained in the molecule is less than 1 on average, curability becomes insufficient and it becomes difficult to exhibit good rubber elastic behavior. The reactive silicon group may be at the end of the main chain or the side chain of the organic polymer molecular chain, or at both ends. In particular, when the reactive silicon group is at the end of the main chain of the molecular chain, the effective network chain length of the organic polymer component contained in the finally formed coating film is increased, so that the strength and elongation are high. It becomes easy to obtain a rubber-like coating film exhibiting a low elastic modulus.

The polyoxyalkylene polymer (A1) essentially has the general formula (3):
—R ⁴ —O— (3)
(Wherein R ⁴ is a linear or branched alkylene group having 1 to 14 carbon atoms), and R ⁴ in the general formula (3) is a carbon atom. A linear or branched alkylene group having 1 to 14 or 2 to 4 is preferable.
Specific examples of the repeating unit represented by the general formula (3) include
_{-CH 2 O -, - CH 2} CH 2 O -, - CH 2 CH (CH 3) O -, - CH 2 CH (C 2 H 5) O -, - CH 2 C (CH 3) 2 O-, _{-CH 2 CH 2 CH 2 CH 2} O-
Etc. The main chain skeleton of the polyoxyalkylene polymer may be composed of only one type of repeating unit, or may be composed of two or more types of repeating units. In particular, when used as a sealant or the like, a polymer comprising a propylene oxide polymer as a main component is preferable because it is amorphous or has a relatively low viscosity.

  Examples of the method for synthesizing the polyoxyalkylene polymer include a polymerization method using an alkali catalyst such as KOH, and a complex obtained by reacting an organoaluminum compound and porphyrin as disclosed in JP-A-61-215623. Polymerization method using transition metal compound-porphyrin complex catalyst, Japanese Patent Publication No. 46-27250, Japanese Patent Publication No. 59-15336, US Patent 3,278,457, US Patent 3,278,458, US Patent 3,278,459, US Patent 3,427,256, US Patent 3,427,334, Polymerization method using double metal cyanide complex catalyst as shown in U.S. Pat. No. 3,427,335, polymerization method using catalyst comprising polyphosphazene salt exemplified in JP-A-10-273512, phosphazene exemplified in JP-A-11-060722 Using a compound catalyst Polymerization method, and the like, but not particularly limited.

  A method for producing a polyoxyalkylene polymer having a reactive silicon group is disclosed in JP-B Nos. 45-36319, 46-12154, JP-A Nos. 50-156599, 54-6096, and 55-13767. JP-A-55-13468, 57-164123, JP-B-3-2450, US Pat. No. 3,632,557, US Pat. No. 4,345,053, US Pat. No. 4,366,307, US Pat. No. 4,960,844, etc. -197631, 61-215622, 61-215623, 61-218632, JP-A-3-72527, JP-A-3-47825, and JP-A-8-231707. Polyoxya with a narrow molecular weight distribution with a high molecular weight with a number average molecular weight of 6,000 or more and Mw / Mn of 1.6 or less Killen polymer can be exemplified, but not particularly limited thereto.

  The above polyoxyalkylene polymers having a reactive silicon group may be used alone or in combination of two or more.

  It does not specifically limit as a (meth) acrylic acid ester type monomer which comprises the principal chain of the said (meth) acrylic acid ester type polymer (A2), A various thing can be used. Examples include (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, Isobutyl (meth) acrylate, tert-butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, cyclohexyl (meth) acrylate, n-heptyl (meth) acrylate, N-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, phenyl (meth) acrylate, (meth) acrylic Acid toluyl, benzyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, (meth) acrylic 3-methoxybutyl, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, stearyl (meth) acrylate, glycidyl (meth) acrylate, 2-aminoethyl (meth) acrylate, γ -(Methacryloyloxypropyl) trimethoxysilane, γ- (methacryloyloxypropyl) dimethoxymethylsilane, methacryloyloxymethyltrimethoxysilane, methacryloyloxymethyltriethoxysilane, methacryloyloxymethyldimethoxymethylsilane, methacryloyloxymethyldiethoxymethylsilane, (Meth) acrylic acid ethylene oxide adduct, (meth) acrylic acid trifluoromethyl methyl, (meth) acrylic acid 2-trifluoromethyl ethyl, (meth) acrylic acid 2- -Fluoroethylethyl, 2-perfluoroethyl-2-perfluorobutylethyl (meth) acrylate, perfluoroethyl (meth) acrylate, trifluoromethyl (meth) acrylate, bis (trifluoro) (meth) acrylate Methyl) methyl, (meth) acrylic acid 2-trifluoromethyl-2-perfluoroethylethyl, (meth) acrylic acid 2-perfluorohexylethyl, (meth) acrylic acid 2-perfluorodecylethyl, (meth) acrylic Examples include (meth) acrylic acid monomers such as 2-perfluorohexadecylethyl acid.

  In the (meth) acrylic acid ester polymer, the following vinyl monomer can be copolymerized together with the (meth) acrylic acid ester monomer. Examples of the vinyl monomer include styrene monomers such as styrene, vinyl toluene, α-methyl styrene, chlorostyrene, styrene sulfonic acid, and salts thereof; fluorine-containing vinyl monomers such as perfluoroethylene, perfluoropropylene, and vinylidene fluoride. Silicon-containing vinyl monomers such as vinyltrimethoxysilane and vinyltriethoxysilane; maleic anhydride, maleic acid, monoalkyl and dialkyl esters of maleic acid; fumaric acid, monoalkyl and dialkyl esters of fumaric acid; maleimide, Methyl maleimide, ethyl maleimide, propyl maleimide, butyl maleimide, hexyl maleimide, octyl maleimide, dodecyl maleimide, stearyl maleimide, phenyl maleimide, cyclohex Maleimide monomers such as lumaleimide; Nitrile group-containing vinyl monomers such as acrylonitrile and methacrylonitrile; Amide group-containing vinyl monomers such as acrylamide and methacrylamide; Vinyl acetate, vinyl propionate, vinyl pivalate, vinyl benzoate, cinnamon Examples thereof include vinyl esters such as vinyl acid; alkenes such as ethylene and propylene; conjugated dienes such as butadiene and isoprene; vinyl chloride, vinylidene chloride, allyl chloride, and allyl alcohol. These may be used alone or a plurality of these may be copolymerized. Among these, the polymer which consists of a styrene-type monomer and a (meth) acrylic-acid type monomer is preferable from the physical property of a product. More preferred is a (meth) acrylic acid ester polymer composed of an acrylic acid ester monomer and a methacrylic acid ester monomer, and particularly preferred is an acrylic acid ester polymer composed of an acrylic acid ester monomer. In applications such as general construction, a butyl acrylate monomer is more preferable from the viewpoint that physical properties such as low viscosity of elastic paint, low modulus of coating film, high elongation, weather resistance, and heat resistance are required. On the other hand, in applications that require oil resistance, such as automobile applications, copolymers based on ethyl acrylate are more preferred.

  This polymer mainly composed of ethyl acrylate is excellent in oil resistance but tends to be slightly inferior in low temperature characteristics (cold resistance). Therefore, in order to improve the low temperature characteristics, a part of ethyl acrylate is converted into butyl acrylate. It is also possible to replace it. However, as the ratio of butyl acrylate is increased, its good oil resistance is impaired. Therefore, for applications requiring oil resistance, the ratio is preferably 40% or less, and more preferably 30% or less. More preferably. It is also preferable to use 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate, or the like in which oxygen is introduced into the alkyl group in the side chain in order to improve low temperature characteristics and the like without impairing oil resistance. However, since heat resistance tends to be inferior due to the introduction of an alkoxy group having an ether bond in the side chain, when heat resistance is required, the ratio is preferably 40% or less. In accordance with various uses and required purposes, it is possible to obtain suitable polymers by changing the ratio in consideration of required physical properties such as oil resistance, heat resistance and low temperature characteristics. For example, although not limited, examples of excellent balance of physical properties such as oil resistance, heat resistance, and low temperature characteristics include ethyl acrylate / butyl acrylate / 2-methoxyethyl acrylate (40-50 / 20 by weight) 30/30 to 20). In the present invention, these preferred monomers may be copolymerized with other monomers, and further block copolymerized, and in that case, these preferred monomers are preferably contained in a weight ratio of 40% or more. . In the above expression format, for example, (meth) acrylic acid represents acrylic acid and / or methacrylic acid.

  It does not specifically limit as a synthesis method of a (meth) acrylic acid ester type polymer, What is necessary is just to carry out by a well-known method. However, a polymer obtained by a normal free radical polymerization method using an azo compound or a peroxide as a polymerization initiator has a problem that the molecular weight distribution is generally as large as 2 or more and the viscosity is increased. Yes. Therefore, in order to obtain a (meth) acrylate polymer having a narrow molecular weight distribution and a low viscosity and having a crosslinkable functional group at the molecular chain terminal at a high ratio. It is preferable to use a living radical polymerization method.

  Among the “living radical polymerization methods”, the “atom transfer radical polymerization method” for polymerizing a (meth) acrylate monomer using an organic halide or a sulfonyl halide compound as an initiator and a transition metal complex as a catalyst, In addition to the characteristics of the “living radical polymerization method”, it has a halogen or the like that is relatively advantageous for functional group conversion reaction, and has a specific functional group because it has a large degree of freedom in designing initiators and catalysts ( The method for producing a (meth) acrylic acid ester polymer is more preferable. Examples of this atom transfer radical polymerization method include Matyjazewski et al., Journal of American Chemical Society (J. Am. Chem. Soc.) 1995, 117, 5614.

  Examples of the method for producing a (meth) acrylic acid ester-based polymer having a reactive silicon group include chain transfer described in JP-B-3-14068, JP-B-4-55444, JP-A-6-221922, and the like. A production method using a free radical polymerization method using an agent is disclosed. Japanese Patent Application Laid-Open No. 9-272714 discloses a production method using an atom transfer radical polymerization method, but is not particularly limited thereto.

  The (meth) acrylic acid ester-based polymer having a reactive silicon group may be used alone or in combination of two or more.

  These organic polymers having a reactive silicon group may be used alone or in combination of two or more. Specifically, a group consisting of a polyoxyalkylene polymer having a reactive silicon group, a saturated hydrocarbon polymer having a reactive silicon group, and a (meth) acrylic acid ester polymer having a reactive silicon group An organic polymer obtained by blending two or more selected from the above can also be used.

A method for producing an organic polymer obtained by blending a polyoxyalkylene polymer having a reactive silicon group and a (meth) acrylic acid ester polymer having a reactive silicon group is disclosed in JP-A-59-122541. Although proposed in Japanese Laid-Open Patent Publication No. 63-112642, Japanese Laid-Open Patent Publication No. 6-172631, and Japanese Laid-Open Patent Publication No. 11-116763, the invention is not particularly limited thereto. A preferred specific example has a reactive silicon group and a molecular chain substantially having the following general formula (4):
—CH ₂ —C (R ⁵ ) (COOR ⁶ ) — (4)
(Wherein R ⁵ represents a hydrogen atom or a methyl group, and R ⁶ represents an alkyl group having 1 to 8 carbon atoms) and a (meth) acrylic acid ester having an alkyl group having 1 to 8 carbon atoms A monomer unit and the following general formula (5):
^{_{-CH 2 -C (R 5) (}} COOR 7) - (5)
(Wherein R ⁵ is the same as above, and R ⁷ represents an alkyl group having 10 or more carbon atoms) represented by a (meth) acrylate monomer unit having an alkyl group having 10 or more carbon atoms And a copolymer obtained by blending a polyoxyalkylene polymer having a reactive silicon group.

R ^{6 in the} general formula (4) is, for example, 1 to 8, preferably 1 to 4, carbon atoms such as methyl group, ethyl group, propyl group, n-butyl group, t-butyl group, and 2-ethylhexyl group. More preferred are 1 to 2 alkyl groups. The alkyl group of R ⁶ may alone, or may be a mixture of two or more.

R ^{7 in the} general formula (5) is, for example, a long chain having 10 or more carbon atoms such as lauryl group, tridecyl group, cetyl group, stearyl group, behenyl group, etc., usually 10 to 30, preferably 10 to 20 And an alkyl group. The alkyl group of R ⁷ is similar to the case of R ^6, alone may or may be a mixture of two or more.

  The molecular chain of the (meth) acrylic acid ester-based polymer is substantially composed of monomer units of the general formula (4) and the general formula (5). It means that the sum of the monomer units of formula (4) and formula (5) present in the coal exceeds 50% by weight. The total of the monomer units of the general formula (4) and the general formula (5) is preferably 70% by weight or more.

  Further, the abundance ratio of the monomer unit of the general formula (4) and the monomer unit of the general formula (5) is preferably 95: 5 to 40:60, and more preferably 90:10 to 60:40 by weight ratio. .

  Examples of monomer units other than the general formula (4) and general formula (5) that may be contained in the copolymer include acrylic acid such as acrylic acid and methacrylic acid; acrylamide, methacrylamide, and N-methylol. Monomers containing amide groups such as acrylamide and N-methylol methacrylamide, epoxy groups such as glycidyl acrylate and glycidyl methacrylate, amino groups such as diethylaminoethyl acrylate, diethylaminoethyl methacrylate and aminoethyl vinyl ether; other acrylonitrile, styrene, α- Examples thereof include monomer units derived from methyl styrene, alkyl vinyl ether, vinyl chloride, vinyl acetate, vinyl propionate, ethylene and the like.

  Organic polymers obtained by blending a saturated hydrocarbon polymer having a reactive silicon group and a (meth) acrylic acid ester polymer having a reactive silicon group are disclosed in JP-A-1-168774 and JP-A-2000-186176. However, it is not particularly limited to these.

  Furthermore, as a method for producing an organic polymer obtained by blending a (meth) acrylic acid ester-based polymer having a reactive silicon functional group, in the presence of an organic polymer having a reactive silicon group ( A method of polymerizing a meth) acrylate monomer can be used. This production method is specifically disclosed in JP-A-59-78223, JP-A-59-168014, JP-A-60-228516, JP-A-60-228517, etc. It is not limited to these.

  On the other hand, the main chain skeleton of the organic polymer may contain other components such as a urethane bond component as long as the effects of the present invention are not significantly impaired.

  A curing catalyst is added to the elastic paint used in the present invention as necessary. Specific examples of the curing catalyst include carboxylic acid metal salts such as tin 2-ethylhexanoate, tin versatate and bismuth 2-ethylhexanoate; carboxylic acids such as 2-ethylhexanoic acid and versatic acid; dibutyltin dilaurate, dibutyl Tin maleate, dibutyl tin phthalate, dibutyl tin dioctanoate, dibutyl tin bis (2-ethylhexanoate), dibutyl tin bis (methyl maleate), dibutyl tin bis (ethyl maleate), dibutyl tin bis (butyl maleate), Dibutyltin bis (octyl maleate), dibutyl tin bis (tridecyl maleate), dibutyl tin bis (benzyl maleate), dibutyl tin diacetate, dioctyl tin bis (ethyl maleate), dioctyl tin bis (octyl maleate) , Dibutyltin dimethoxide, jib Ditintin dioxide such as rutin bis (nonylphenoxide), dibutenyl tin oxide, dibutyltin bis (acetylacetonate), dibutyltin bis (ethylacetoacetate), reaction product of dibutyltin oxide and silicate compound, dibutyltin dilaurate, etc. Tetravalent organotin compounds such as a reaction product of a carboxylate and a silicate compound, a reaction product of dibutyltin oxide and a phthalate ester; tetraisopropoxytitanium, tetran-butoxytitanium, diisopropoxytitanium bis (acetylacetonate) , Organic titanates such as diisopropoxy titanium bis (ethyl acetoacetate); aluminum tris (acetylacetonate), aluminum tris (ethyl acetoacetate), diisopropoxyaluminum ethyl acetate Organoaluminum compounds such as toacetate; zirconium compounds such as zirconium tetrakis (acetylacetonate); methylamine, ethylamine, propylamine, isopropylamine, butylamine, amylamine, hexylamine, octylamine, 2-ethylhexylamine, nonylamine, Aliphatic primary amines such as decylamine, laurylamine, pentadecylamine, cetylamine, stearylamine, cyclohexylamine; dimethylamine, diethylamine, dipropylamine, diisopropylamine, dibutylamine, diamylamine, dihexylamine, dioctylamine, bis (2-Ethylhexyl) amine, didecylamine, dilaurylamine, dicetylamine, distearylamine, methyl stearate Aliphatic secondary amines such as rilamine, ethylstearylamine, and butylstearylamine; Aliphatic tertiary amines such as triamylamine, trihexylamine, and trioctylamine; Aliphatic amines such as triallylamine and oleylamine Saturated amines; aromatic amines such as laurylaniline, stearylaniline, triphenylamine; and other amines such as monoethanolamine, diethanolamine, triethanolamine, 3-hydroxypropylamine, diethylenetriamine, triethylenetetramine, Benzylamine, 3-methoxypropylamine, 3-lauryloxypropylamine, 3-dimethylaminopropylamine, 3-diethylaminopropylamine, xylylenediamine, ethylenediamine, hexa Tylenediamine, triethylenediamine, guanidine, diphenylguanidine, 2,4,6-tris (dimethylaminomethyl) phenol, morpholine, N-methylmorpholine, 2-ethyl-4-methylimidazole, 1,8-diazabicyclo (5,4 , 0) undecene-7 (DBU), 1,5-diazabicyclo (4,3,0) nonene-5 (DBN) and the like.

  The curing catalyst is used in the range of 0.01 to 10 parts by weight, preferably 0.1 to 7 parts by weight, more preferably 0.5 to 4 parts by weight with respect to 100 parts by weight of the organic polymer (A). .

  A silane coupling agent is added to the elastic paint used in the present invention as necessary. Specific examples of the silane coupling agent include γ-isocyanatopropyltrimethoxysilane, γ-isocyanatopropyltriethoxysilane, γ-isocyanatopropylmethyldiethoxysilane, γ-isocyanatopropylmethyldimethoxysilane, and (isocyanatemethyl) trimethoxysilane. , (Isocyanatemethyl) dimethoxymethylsilane, (isocyanatemethyl) triethoxysilane, (isocyanatemethyl) diethoxymethylsilane and other isocyanate group-containing silanes; γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ -Aminopropyltriisopropoxysilane, γ-aminopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, γ- (2-aminoethyl) Aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, γ- (2-aminoethyl) aminopropyltriethoxysilane, γ- (2-aminoethyl) aminopropylmethyldiethoxysilane, γ -(2-aminoethyl) aminopropyltriisopropoxysilane, γ- (6-aminohexyl) aminopropyltrimethoxysilane, 3- (N-ethylamino) -2-methylpropyltrimethoxysilane, γ-ureidopropyltri Methoxysilane, γ-ureidopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, N-benzyl-γ-aminopropyltrimethoxysilane, N-vinylbenzyl-γ-aminopropyltriethoxysilane, N- Cyclohexylaminome Lutriethoxysilane, N-cyclohexylaminomethyldiethoxymethylsilane, N-phenylaminomethyltrimethoxysilane, (2-aminoethyl) aminomethyltrimethoxysilane, N, N′-bis [3- (trimethoxysilyl) propyl Amino group-containing silanes such as ethylenediamine; ketimine silanes such as N- (1,3-dimethylbutylidene) -3- (triethoxysilyl) -1-propanamine; γ-mercaptopropyltrimethoxysilane, γ -Mercapto group-containing silanes such as mercaptopropyltriethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropylmethyldiethoxysilane, mercaptomethyltrimethoxysilane, mercaptomethyltriethoxysilane; γ-glycidoxypro Rutrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyl Epoxy group-containing silanes such as triethoxysilane; β-carboxyethyltriethoxysilane, β-carboxyethylphenylbis (2-methoxyethoxy) silane, N-β- (carboxymethyl) aminoethyl-γ-aminopropyltrimethoxy Carboxysilanes such as silane; vinyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloyloxypropylmethyldimethoxysilane, γ-acryloyloxypropyltriethoxysilane, methacryloyloxymethyltrimethoxysilane Examples include vinyl-type unsaturated group-containing silanes such as lan; halogen-containing silanes such as γ-chloropropyltrimethoxysilane; isocyanurate silanes such as tris (3-trimethoxysilylpropyl) isocyanurate; In addition, amino-modified silyl polymers, silylated amino polymers, unsaturated aminosilane complexes, phenylamino long-chain alkylsilanes, aminosilylated silicones, silylated polyesters, and the like, which are derivatives of these, can also be used as silane coupling agents. . Examples of the reaction product of the silane coupling agent include the reaction product of aminosilane and epoxysilane, the reaction product of aminosilane and isocyanate silane, and partial condensates of various silane coupling agents.

  The silane coupling agent is preferably about 0.1 to 15 parts by weight, more preferably about 1 to 10 parts by weight, and particularly preferably about 3 to 7 parts by weight with respect to 100 parts by weight of the organic polymer (A). If the blending amount is below this range, the adhesion and storage stability may not be sufficient. On the other hand, if the blending amount exceeds this range, the coating film formability may not be sufficient.

  A filler is added to the elastic paint used in the present invention as necessary. Fillers include reinforcing silica such as fumed silica, precipitated silica, crystalline silica, fused silica, dolomite, anhydrous silicic acid, hydrous silicic acid, and carbon black; heavy calcium carbonate, colloidal calcium carbonate, magnesium carbonate Diatomaceous earth, calcined clay, clay, talc, titanium oxide, bentonite, organic bentonite, ferric oxide, aluminum fine powder, flint powder, zinc oxide, activated zinc white, shirasu balloon, glass microballoon, phenol resin and vinylidene chloride Examples include fillers such as resin organic microballoons, PVC powder, PMMA powder, and the like; fibrous fillers such as asbestos, glass fibers, and filaments. Among these, heavy calcium carbonate is preferable from the viewpoint of cost and viscosity. Further, when the elastic paint is used as a heat-shielding white roof type elastic paint, it is preferable to use titanium oxide.

  When using a filler, the amount of use is 1-250 weight part with respect to 100 weight part of organic polymers (A), Preferably it is 10-200 weight part.

  A plasticizer is added to the elastic paint used in the present invention as necessary. In the present invention, a compound having a vapor pressure at 20 ° C. of less than 0.01 KPa, nonreactive with the organic polymer (A), and capable of plasticizing the organic polymer (A) is defined as a plasticizer. By adding a plasticizer, it is possible to adjust the viscosity and slump property of the elastic paint and mechanical properties such as the tensile strength and elongation of the coating film obtained by curing the elastic paint.

  Examples of the plasticizer include phthalic acid esters such as dibutyl phthalate, diheptyl phthalate, di (2-ethylhexyl) phthalate, and butyl benzyl phthalate; non-aromatic secondary compounds such as dioctyl adipate, dioctyl sebacate, dibutyl sebacate, and isodecyl succinate Basic acid esters; Aliphatic esters such as butyl oleate and methyl acetylricinoleate; Phosphate esters such as tricresyl phosphate and tributyl phosphate; Trimellitic acid esters; Chlorinated paraffins; Alkyldiphenyl, Partial Hydrocarbon oils such as hydrogenated terphenyl; process oils; epoxy plasticizers such as epoxidized soybean oil and epoxy benzyl stearate.

  Moreover, a polymeric plasticizer can be used. When a high-molecular plasticizer is used, the initial physical properties are maintained over a long period of time as compared with the case where a low-molecular plasticizer that is a plasticizer containing no polymer component in the molecule is used. Furthermore, the drying property (also referred to as paintability) when an alkyd paint is applied to the coating film can be improved. Specific examples of the polymer plasticizer include vinyl polymers obtained by polymerizing vinyl monomers by various methods; esters of polyalkylene glycols such as diethylene glycol dibenzoate, triethylene glycol dibenzoate, and pentaerythritol ester; Polyester plasticizer obtained from dibasic acids such as sebacic acid, adipic acid, azelaic acid and phthalic acid and dihydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol and dipropylene glycol; Are 1000 or more polyether polyols such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, etc., or the hydroxyl groups of these polyether polyols are ester groups, ethers Polyethers such as derivatives converted into groups, etc .; polystyrenes such as polystyrene and poly-α-methylstyrene; polybutadiene, polybutene, polyisobutylene, butadiene-acrylonitrile, polychloroprene, and the like, but are not limited thereto is not.

  Among these polymer plasticizers, those compatible with the organic polymer (A) are preferable. From this point, polyethers and vinyl polymers are preferable. Further, when polyethers are used as plasticizers, surface curability and deep curability are improved, curing delay after storage does not occur, and dust adhesion is less, and polypropylene glycol is more preferable. Moreover, a vinyl polymer is preferable from the viewpoint of compatibility, weather resistance, and heat resistance. Among vinyl polymers, acrylic polymers and / or methacrylic polymers are preferred, and acrylic polymers such as polyacrylic acid alkyl esters are more preferred.

  The polymer synthesis method is preferably a living radical polymerization method and more preferably an atom transfer radical polymerization method because the molecular weight distribution is narrow and viscosity can be lowered. Moreover, it is preferable to use a polymer obtained by so-called SGO process obtained by continuous bulk polymerization of an alkyl acrylate monomer described in JP-A-2001-207157 at high temperature and high pressure.

  The number average molecular weight of the polymer plasticizer is preferably 500 to 15,000, more preferably 800 to 10,000, still more preferably 1,000 to 8,000, and particularly preferably 1,000 to 1,000. 5,000. Most preferably, it is 1,000-3,000. If the molecular weight is too low, the plasticizer will flow out over time due to heat and rain, the initial physical properties cannot be maintained over a long period of time, and the alkyd paintability cannot be improved. Moreover, when molecular weight is too high, a viscosity will become high and workability | operativity will worsen. The molecular weight distribution of the polymer plasticizer is not particularly limited, but is preferably narrow and is preferably less than 1.80. 1.70 or less is more preferable, 1.60 or less is more preferable, 1.50 or less is more preferable, 1.40 or less is particularly preferable, and 1.30 or less is most preferable.

  The number average molecular weight is measured by a GPC method in the case of a vinyl polymer, and by a terminal group analysis method in the case of a polyether polymer. Moreover, it is measured by molecular weight distribution (Mw / Mn) GPC method (polystyrene conversion).

  A plasticizer may be used independently and may use 2 or more types together. Further, a low molecular plasticizer and a high molecular plasticizer may be used in combination. These plasticizers can also be blended at the time of polymer production.

  The usage-amount of a plasticizer is 5-150 weight part with respect to 100 weight part of organic polymers (A), Preferably it is 10-120 weight part, More preferably, it is 20-100 weight part. If it is less than 5 parts by weight, the effect as a plasticizer is not expressed, and if it exceeds 150 parts by weight, the mechanical strength of the coating film is insufficient.

  A thixotropic agent (anti-sagging agent) may be added to the elastic paint used in the present invention as needed to prevent sagging and improve workability. The anti-sagging agent is not particularly limited, and examples thereof include polyamide waxes; hydrogenated castor oil derivatives; metal soaps such as calcium stearate, aluminum stearate, and barium stearate. Further, when rubber powder having a particle size of 10 to 500 μm as described in JP-A-11-349916 or organic fiber as described in JP-A-2003-155389 is used, thixotropy is high. An elastic paint with good workability can be obtained. These thixotropic agents (anti-sagging agents) may be used alone or in combination of two or more. The thixotropic agent is used in the range of 0.1 to 20 parts by weight with respect to 100 parts by weight of the polyoxyalkylene polymer (A) having a reactive silicon group.

  A photocurable material can be used in the elastic paint used in the present invention as necessary. When a photocurable material is used, a film of a photocurable material is formed on the surface of the coating film, and the stickiness and weather resistance of the coating film can be improved. A photocurable substance is a substance that undergoes a chemical change in its molecular structure in a very short time due to the action of light, resulting in a change in physical properties such as curing. Many compounds such as organic monomers, oligomers, resins or compositions containing them are known as this type of compound, and any commercially available compound can be adopted. Representative examples include unsaturated acrylic compounds, polyvinyl cinnamates, azide resins, and the like. Unsaturated acrylic compounds include monomers, oligomers or mixtures thereof having one or several acrylic or methacrylic unsaturated groups, including propylene (or butylene, ethylene) glycol di (meth) acrylate, neopentyl Examples thereof include monomers such as glycol di (meth) acrylate or oligoesters having a molecular weight of 10,000 or less. Specifically, for example, a special acrylate (bifunctional) Aronix M-210, Aronix M-215, Aronix M-220, Aronix M-233, Aronix M-240, Aronix M-245; (Trifunctional) Aronix M -305, Aronix M-309, Aronix M-310, Aronix M-315, Aronix M-320, Aronix M-325, and (Multifunctional) Aronix M-400, etc., but especially contain acrylic functional groups The compound which contains 3 or more same functional groups on average in 1 molecule is preferable. (All Aronix is a product of Toa Gosei Chemical Co., Ltd.)

  Examples of the polyvinyl cinnamates include photosensitive resins having a cinnamoyl group as a photosensitive group, and those obtained by esterifying polyvinyl alcohol with cinnamic acid, as well as many polyvinyl cinnamate derivatives. The azide resin is known as a photosensitive resin having an azide group as a photosensitive group. Usually, in addition to a rubber photosensitive solution in which a diazide compound is added as a photosensitive agent, a “photosensitive resin” (March 17, 1972). There are detailed examples in Publishing, Publishing Society of Printing Press, page 93-, page 106-, page 117-), these may be used alone or in combination, and a sensitizer may be added as necessary. Can do. Note that the addition of a sensitizer such as ketones or nitro compounds or an accelerator such as amines may enhance the effect. The photocurable substance is used in an amount of 0.1 to 20 parts by weight, preferably 0.5 to 10 parts by weight, based on 100 parts by weight of the polyoxyalkylene polymer (A) having a reactive silicon group. Well, if it is 0.1 parts by weight or less, there is no effect of improving the weather resistance, and if it is 20 parts by weight or more, the coating film becomes too hard and tends to crack.

  An oxygen curable material can be used for the elastic paint used in the present invention. Examples of the oxygen curable substance include unsaturated compounds that can react with oxygen in the air. The oxygen curable substance reacts with oxygen in the air to form a cured film near the surface of the coating film. And prevents dust from adhering. Specific examples of the oxygen curable substance include drying oils typified by drill oil and linseed oil, various alkyd resins obtained by modifying the compounds; acrylic polymers and epoxy resins modified with drying oils , Silicone resins; 1,2-polybutadiene, 1,4-polybutadiene, C5-C8 diene polymers obtained by polymerizing or copolymerizing diene compounds such as butadiene, chloroprene, isoprene, 1,3-pentadiene, etc. Liquid polymers, liquid copolymers such as NBR and SBR obtained by copolymerizing monomers such as acrylonitrile and styrene copolymerizable with these diene compounds so that the main component is a diene compound, Further, various modified products thereof (maleinized modified products, boiled oil modified products, etc.) and the like can be mentioned. These may be used alone or in combination of two or more. Of these, drill oil and liquid diene polymers are particularly preferable.

  Moreover, the effect may be enhanced if a catalyst for promoting the oxidative curing reaction or a metal dryer is used in combination. Examples of these catalysts and metal dryers include metal salts such as cobalt naphthenate, lead naphthenate, zirconium naphthenate, cobalt octylate, zirconium octylate, and amine compounds. The amount of the oxygen curable substance used is preferably in the range of 0.1 to 20 parts by weight, more preferably 0 to 100 parts by weight of the polyoxyalkylene polymer (A) having a reactive silicon group. .5 to 10 parts by weight. If the amount used is less than 0.1 parts by weight, the improvement of the contamination is not sufficient, and if it exceeds 20 parts by weight, the tensile properties of the coating film tend to be impaired. As described in JP-A-3-160053, the oxygen curable substance is preferably used in combination with a photocurable substance.

  An antioxidant (anti-aging agent) is added to the elastic paint used in the present invention as necessary. When antioxidant is used, the heat resistance of a coating film can be improved. Examples of the antioxidant include hindered phenols, monophenols, bisphenols, and polyphenols, with hindered phenols being particularly preferred. Similarly, Tinuvin 622LD, Tinuvin 144, CHIMASSORB 944LD, CHIMASSORB 119FL (all manufactured by Ciba Specialty Chemicals Co., Ltd.); MARK LA-57, MARK LA-62, MARK LA-67, MARK LA-63, MARK LA-68 (All from Asahi Denka Kogyo Co., Ltd.); Sanol LS-770, Sanol LS-765, Sanol LS-292, Sanol LS-2626, Sanol LS-1114, Sanol LS-744 (all from Sankyo Co., Ltd.) It is also possible to use hindered amine light stabilizers shown in (1). Specific examples of the antioxidant are also described in JP-A-4-283259 and JP-A-9-194731. The amount of the antioxidant used may be in the range of 0.1 to 10 parts by weight with respect to 100 parts by weight of the polyoxyalkylene polymer (A) having a reactive silicon group, and more preferably is 0.1 to 10 parts by weight. 2 to 5 parts by weight.

  If necessary, a light stabilizer is added to the elastic paint used in the present invention. Use of a light stabilizer can prevent photooxidation degradation of the coating film. Examples of the light stabilizer include benzotriazole, hindered amine, and benzoate compounds, with hindered amines being particularly preferred. The light stabilizer is used in an amount of 0.1 to 10 parts by weight, more preferably 0.1 to 100 parts by weight based on 100 parts by weight of the polyoxyalkylene polymer (A) having a reactive silicon group. 2 to 5 parts by weight. Specific examples of the light stabilizer are also described in JP-A-9-194731.

  When the elastic paint used in the present invention contains a photocurable substance, particularly when it contains an unsaturated acrylic compound, a tertiary amine-containing hindered amine is used as a hindered amine light stabilizer as described in JP-A-5-70531. It is preferable to use a light stabilizer for improving the storage stability of the elastic paint. As tertiary amine-containing hindered amine light stabilizers, Tinuvin 622LD, Tinuvin 144, CHIMASSORB 119FL (all are manufactured by Ciba Specialty Chemicals Co., Ltd.); MARK LA-57, LA-62, LA-67, LA-63 (and above) Examples thereof include light stabilizers such as Sanol LS-765, LS-292, LS-2626, LS-1114, and LS-744 (all of which are manufactured by Sankyo Corporation).

  An ultraviolet absorber is added to the elastic paint used in the present invention as necessary. When the ultraviolet absorber is used, the surface weather resistance of the coating film can be increased. Examples of ultraviolet absorbers include benzophenone-based, benzotriazole-based, salicylate-based, substituted tolyl-based, and metal chelate-based compounds, among which benzotriazole-based compounds are particularly preferable. The amount of the ultraviolet absorber used is preferably in the range of 0.1 to 10 parts by weight with respect to 100 parts by weight of the polyoxyalkylene polymer (A) having a reactive silicon group. Part by weight is more preferred. It is preferable to use a phenolic or hindered phenolic antioxidant, a hindered amine light stabilizer and a benzotriazole ultraviolet absorber in combination.

  An epoxy resin is added to the elastic paint used in the present invention as necessary. An elastic paint to which an epoxy resin is added is particularly excellent in adhesion and adhesion.

  Epoxy hydrin-bisphenol A type epoxy resin, epichlorohydrin-bisphenol F type epoxy resin, flame retardant type epoxy resin such as glycidyl ether of tetrabromobisphenol A, novolac type epoxy resin, hydrogenated bisphenol A type epoxy resin, bisphenol A Glycidyl ether type epoxy resin of propylene oxide adduct, p-oxybenzoic acid glycidyl ether ester type epoxy resin, m-aminophenol type epoxy resin, diaminodiphenylmethane type epoxy resin, urethane-modified epoxy resin, various alicyclic epoxy resins, N , N-diglycidylaniline, N, N-diglycidyl-o-toluidine, triglycidyl isocyanurate, polyalkylene glycol diglycidyl ether Examples include glycidyl ethers of polyhydric alcohols such as glycerin, epoxidized products of unsaturated polymers such as hydantoin type epoxy resins, petroleum resins, etc., but are not limited to these, and generally used epoxies Resins can be used. Those containing at least two epoxy groups in the molecule are preferred because they are highly reactive during curing and the cured product easily forms a three-dimensional network. More preferred are bisphenol A type epoxy resins or novolac type epoxy resins. When improving the strength of the coating film of the organic polymer (A), 1 to 200 parts by weight, more preferably 5 to 100 parts by weight of the epoxy resin is used with respect to 100 parts by weight of the organic polymer (A). Is good.

  When adding an epoxy resin, it is natural that a curing agent for curing the epoxy resin can be used in combination. There is no restriction | limiting in particular as an epoxy resin hardening | curing agent which can be used, The epoxy resin hardening | curing agent generally used can be used. Specifically, for example, triethylenetetramine, tetraethylenepentamine, diethylaminopropylamine, N-aminoethylpiperidine, m-xylylenediamine, m-phenylenediamine, diaminodiphenylmethane, diaminodiphenylsulfone, isophoronediamine, amine-terminated poly Primary and secondary amines such as ether; tertiary amines such as 2,4,6-tris (dimethylaminomethyl) phenol and tripropylamine, and salts of these tertiary amines; polyamide resins; imidazole Dicyandiamides; boron trifluoride complex compounds; phthalic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, dodecynyl succinic anhydride, pyromellitic anhydride, chlorenic anhydride, etc .; alcohols ; Fe Lumpur acids; carboxylic acids; but the compound of diketone complex compounds of aluminum or zirconium, or the like can be exemplified, but the invention is not limited thereto. Further, the curing agents may be used alone or in combination of two or more.

  When the epoxy resin curing agent is used, the amount used is in the range of 0.1 to 300 parts by weight with respect to 100 parts by weight of the epoxy resin.

  Ketimine can be used as a curing agent for the epoxy resin. Ketimine is stably present in the absence of moisture, and is decomposed into primary amines and ketones by moisture, and the resulting primary amine becomes a room temperature curable curing agent for the epoxy resin. When ketimine is used, a one-pack type elastic paint can be obtained. Such a ketimine can be obtained by a condensation reaction between an amine compound and a carbonyl compound.

  For the synthesis of ketimine, known amine compounds and carbonyl compounds may be used. For example, as amine compounds, ethylenediamine, propylenediamine, trimethylenediamine, tetramethylenediamine, 1,3-diaminobutane, 2,3-diaminobutane, Diamines such as pentamethylenediamine, 2,4-diaminopentane, hexamethylenediamine, p-phenylenediamine, p, p'-biphenylenediamine; 1,2,3-triaminopropane, triaminobenzene, tris (2-amino Polyethylamines such as ethyl) amine and tetrakis (aminomethyl) methane; polyalkylene polyamines such as diethylenetriamine, triethylenetriamine and tetraethylenepentamine; polyoxyalkylene polyamines; γ-aminopropyl Triethoxysilane, N-(beta-aminoethyl)-.gamma.-aminopropyltrimethoxysilane, N-(beta-aminoethyl)-.gamma.-aminopropyl aminosilane such as methyldimethoxysilane; and may be used. Examples of the carbonyl compound include aldehydes such as acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, diethylacetaldehyde, glyoxal and benzaldehyde; cyclic ketones such as cyclopentanone, trimethylcyclopentanone, cyclohexanone and trimethylcyclohexanone; acetone , Aliphatic ketones such as methyl ethyl ketone, methyl propyl ketone, methyl isopropyl ketone, methyl isobutyl ketone, diethyl ketone, dipropyl ketone, diisopropyl ketone, dibutyl ketone, diisobutyl ketone; acetylacetone, methyl acetoacetate, ethyl acetoacetate, dimethyl malonate , Β-dicarbonyl compounds such as diethyl malonate, methyl ethyl malonate, dibenzoylmethane And the like can be used.

  When an imino group is present in the ketimine, the imino group may be reacted with styrene oxide; glycidyl ether such as butyl glycidyl ether or allyl glycidyl ether; glycidyl ester or the like. These ketimines may be used alone or in combination of two or more, and are used in an amount of 1 to 100 parts by weight with respect to 100 parts by weight of the epoxy resin, and the amount used is the kind of epoxy resin and ketimine It depends on.

  To the elastic paint used in the present invention, a phosphorus plasticizer such as ammonium polyphosphate and tricresyl phosphate, a flame retardant such as aluminum hydroxide, magnesium hydroxide, and thermally expandable graphite can be added. The said flame retardant may be used independently and may be used together 2 or more types.

  The flame retardant is used in an amount of 5 to 200 parts by weight, preferably 10 to 100 parts by weight, based on 100 parts by weight of the organic polymer (A).

In the elastic paint used in the present invention, a solvent can be used for the purpose of reducing the viscosity of the elastic paint, increasing thixotropy, and improving workability. The solvent is not particularly limited, and various compounds can be used. Specific examples include hydrocarbon solvents such as toluene, xylene, heptane, hexane, petroleum solvents, halogen solvents such as trichloroethylene, ester solvents such as ethyl acetate and butyl acetate, acetone, methyl ethyl ketone, and methyl isobutyl ketone. Examples include ketone solvents, ether solvents, alcohol solvents such as methanol, ethanol and isopropanol, and silicone solvents such as hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane.
As described above, the solvent is preferably 10 parts by weight or less, more preferably 5 parts by weight or less, still more preferably 1 part by weight or less, and 0.1 part by weight or less based on 100 parts by weight of the organic polymer (A). It is particularly preferable that it is substantially not contained.

  Various additives may be added to the elastic paint used in the present invention as necessary for the purpose of adjusting the physical properties of the elastic paint or coating film. Examples of such additives include, for example, curability regulators, radical inhibitors, metal deactivators, ozone degradation inhibitors, phosphorus peroxide decomposers, lubricants, pigments, foaming agents, and anti-anticides. And fungicides. These various additives may be used alone or in combination of two or more. Specific examples other than the specific examples of the additives listed in the present specification include, for example, JP-B-4-69659, JP-B-7-108928, JP-A-63-254149, JP-A-62-2904, It is described in Japanese Laid-Open Patent Publication No. 2001-72854.

  The elastic coating used in the present invention can be prepared as a one-component type in which all the blended components are pre-blended and stored in advance and cured by moisture in the air after construction. A curing catalyst, a filler, It can also be prepared as a two-component type in which components such as a plasticizer and water are blended and the compounding material and the main component of the elastic paint are mixed before use. From the viewpoint of workability, a one-component type is preferable.

  When the elastic paint is of a one-component type, all the blended components are blended in advance. Therefore, the blended components containing moisture are used after being dehydrated and dried in advance or dehydrated by decompression during blending and kneading. preferable. When the elastic paint is a two-component type, there is no need to blend a curing catalyst with the main component containing a polymer having a reactive silicon group, so there is a concern about gelation even if the blending agent contains some moisture. However, when long-term storage stability is required, dehydration drying is preferable. As the dehydration and drying method, a heat drying method is preferable for solid materials such as powder, and a dehydration method using a reduced pressure dehydration method or a synthetic zeolite, activated alumina, silica gel, quicklime, magnesium oxide or the like is preferable for a liquid material. is there. Alternatively, a small amount of an isocyanate compound may be blended to react with an isocyanate group and water for dehydration. Further, an oxazolidine compound such as 3-ethyl-2-methyl-2- (3-methylbutyl) -1,3-oxazolidine may be blended and reacted with water for dehydration. In addition to the dehydration drying method, lower alcohols such as methanol and ethanol; n-propyltrimethoxysilane, vinyltrimethoxysilane, vinylmethyldimethoxysilane, methylsilicate, ethylsilicate, γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropyl By adding an alkoxysilane compound such as methyldiethoxysilane or γ-glycidoxypropyltrimethoxysilane, the storage stability is further improved.

  The amount of the silicon compound capable of reacting with water such as vinyltrimethoxysilane is 0.1 to 20 parts by weight relative to 100 parts by weight of the polyoxyalkylene polymer (A) having a reactive silicon group. The range of 0.5 to 10 parts by weight is preferable.

  The method for preparing the elastic paint used in the present invention is not particularly limited. For example, the above-described components are blended and kneaded using a mixer, roll, kneader, etc. at room temperature or under heating, or a small amount of a suitable solvent is used. Ordinary methods such as dissolving and mixing the components may be employed.

  When exposed to the atmosphere, the elastic paint used in the present invention forms a three-dimensional network structure by the action of moisture, and is cured into a coating film having rubber-like elasticity.

  Next, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

(Synthesis Example 1)
Polymerization of propylene oxide with a polyoxypropylene diol having a molecular weight of about 2,000 as an initiator and a zinc hexacyanocobaltate glyme complex catalyst, and a number average molecular weight of about 14,500 (using Tosoh's HLC-8120GPC as the liquid feeding system) The column used a Tosoh TSK-GEL H type, and the solvent was a polystyrene oxide (polystyrene equivalent molecular weight measured using THF). Subsequently, a methanol solution of 1.2 times equivalent of NaOMe with respect to the hydroxyl group of the hydroxyl group-terminated polypropylene oxide was added to distill off the methanol, and further allyl chloride was added to convert the terminal hydroxyl group into an allyl group. As a result, a polypropylene oxide having a number average molecular weight of about 14,500 having an allyl group at the end was obtained.

After mixing and stirring 300 parts by weight of n-hexane and 300 parts by weight of water with respect to 100 parts by weight of the obtained unpurified allyl group-terminated polypropylene oxide, water was removed by centrifugation, and the resulting hexane solution was further added. 300 parts by weight of water was mixed and stirred, and after removing water again by centrifugation, hexane was removed by devolatilization under reduced pressure to obtain a purified allyl group-terminated polypropylene oxide (hereinafter, allyl polymer). 100 parts by weight of the resulting allyl polymer was reacted with 1.8 parts by weight of methyldimethoxysilane at 90 ° C. for 5 hours using 150 ppm of an isopropanol solution containing a platinum content of 3 wt% of a platinum vinylsiloxane complex as a catalyst. Polypropylene oxide (A-1) was obtained. ^{As a} result of measurement by ¹ H-NMR (measured in CDCl ₃ solvent using JNM-LA400 manufactured by JEOL), the number of terminal methyldimethoxysilyl groups was about 1.5 on average per molecule.

(Synthesis Example 2)
In a nitrogen atmosphere, a 250 L reactor was charged with CuBr (1.03 kg), acetonitrile (11.6 kg), n-butyl acrylate (16.3 kg), ethyl acrylate (4.76 kg), stearyl acrylate (4.94 kg). ) And diethyl 2,5-dibromoadipate (2.13 kg) were added, and the mixture was stirred at 70 to 80 ° C. for about 30 minutes. To this was added pentamethyldiethylenetriamine to initiate the reaction. Over 30 minutes after the start of the reaction, a mixture of n-butyl acrylate (65.2 kg), ethyl acrylate (19.0 kg), and stearyl acrylate (19.8 kg) was continuously added. During the reaction, pentamethyldiethylenetriamine was appropriately added so that the internal temperature became 70 ° C to 90 ° C. The total amount of pentamethyldiethylenetriamine used so far was 208 g. Four hours after the start of the reaction, volatile components were removed by heating and stirring at 80 ° C. under reduced pressure. Acetonitrile (46.8 kg), 1,7-octadiene (26.0 kg) and pentamethyldiethylenetriamine (416 g) were added thereto, and stirring was continued for 8 hours. The mixture was heated and stirred at 80 ° C. under reduced pressure to remove volatile components.

  Toluene was added to this concentrate to dissolve the polymer, diatomaceous earth was added as a filter aid, and the mixture was heated and stirred at an internal temperature of 100 ° C. in an oxygen-nitrogen mixed gas atmosphere (oxygen concentration 6%). The solid content in the mixed solution was removed by filtration, and the filtrate was heated and stirred at an internal temperature of 100 ° C. under reduced pressure to remove volatile components.

  Further, aluminum silicate, hydrotalcite and a heat deterioration inhibitor were added as adsorbents to the concentrate, and the mixture was heated and stirred under reduced pressure (average temperature of about 175 ° C., degree of vacuum of 10 Torr or less). Furthermore, aluminum silicate and hydrotalcite were added as adsorbents, an antioxidant was added, and the mixture was heated and stirred at an internal temperature of 150 ° C. in an oxygen-nitrogen mixed gas atmosphere (oxygen concentration 6%).

  Toluene is added to the concentrate to dissolve the polymer, and then the solid content in the mixed solution is removed by filtration. The filtrate is heated and stirred under reduced pressure to remove volatile matter, and a polymer having an alkenyl group. Got.

  To 100 kg of the polymer having an alkenyl group, dimethoxymethylsilane (2.6 kg), methyl orthoformate (0.8 kg), and a platinum vinylsiloxane complex isopropanol solution 200 ppm with a platinum content of 3 wt% were mixed, and the mixture was 100 ° C. under a nitrogen atmosphere. And stirred with heating.

  It was confirmed by 1H-NMR that the alkenyl group had disappeared, and the reaction mixture was concentrated to obtain an acrylate polymer (A-2) having a dimethoxysilyl group at the terminal. The number average molecular weight of the obtained polymer (A-2) was about 26,000, and the molecular weight distribution was 1.3.

  When the average number of silyl groups introduced per molecule of the polymer was determined by 1H-NMR analysis, it was about 1.7.

Example 1
As component (A), 30 parts by weight of the polymer (A-1) obtained in Synthesis Example 1, 50 parts by weight of the polymer (A-2) obtained in Synthesis Example 2, DIDP (manufactured by Shin Nippon Rika, Sanso 20 parts by weight of sizer DIDP), 80 parts by weight of heavy calcium carbonate (manufactured by Hubercurb, Q3T), 20 parts by weight of titanium oxide (manufactured by DuPont, Ti-Pure R902), UV absorber (manufactured by Ciba Specialty Chemicals, Tinuvin 326) 1 part by weight, 1 part by weight of a light stabilizer (Sankyo LS 770), 0.5 part by weight of a photopolymerization initiator (Ciba Specialty Chemicals, Irgacure 651), vinyltrimethoxysilane (Toray Dow Corning) , A-171) 3 parts by weight, and N- (β-aminoethyl) -γ-aminopropyltrimethoxysilane (manufactured by Toray Dow Corning) The A-1120) 3 parts by weight were kneaded by dehydrating conditions. Finally, 2 parts by weight of tin (II) neodecanoate (Nitto Kasei, Neostan U-50), 0.3 part by weight of neodecanoic acid (manufactured by Japan Epoxy Resin, Versatic 10), 3-diethylaminopropylamine (manufactured by Wako Pure Chemical Industries, Ltd.) ) After adding 0.3 part by weight, they were mixed and sealed in a moisture-proof container to obtain a one-pack type white elastic paint.

(Comparative Examples 1 and 2)
The one using a commercially available one-component acrylic emulsion-based white elastic paint was designated as Comparative Example 1, and the one using a commercially available one-component silicone-based white elastic paint was designated as Comparative Example 2.

  Using the one-component elastic paints of Example 1 and Comparative Examples 1 and 2, the curability (skinning time) and dust adhesion were evaluated in the following manner.

(Curing test)
Each one-pack type elastic coating material was taken out into an ointment can, was adjusted to a thickness of about 5 mm, and the surface was made flat. This time was set as the curing start time, the surface was touched with a spatula, and the time when the composition did not adhere to the spatula was measured as the skinning time. The skinning time was measured under conditions of 35 ° C. 50% RH, 23 ° C. 50% RH, 5 ° C. 100% RH.
The results are shown in Table 1.

(Dust adhesion test)
After forming a 0.5mm-thick coating film on a metal horizontal roof base material using each one-component elastic paint and curing it indoors at 23 ° C and 50% RH for one day, After exposure to the outdoors horizontally, the dust adhesion after 6 months was evaluated with a color difference meter. Those having an L value of less than 70 were rated as x, and those having an L value of 70 or more were rated as ◯.
The results are shown in Table 1.

  As shown in Table 1, the elastic paint containing the organic polymer having a reactive silicon group of the present invention is essentially free from volatile components (VOC), has excellent curability under low temperature humidification conditions, and is resistant to contamination. It can be seen that it has excellent properties (dust adhesion).

Claims (10)

  A non-aqueous and non-solvent system comprising an organic polymer (A) having a silicon-containing group that can be cross-linked by forming a siloxane bond in a roof having a coating film formed on the outermost layer in contact with the outside air A roof characterized by curing an elastic paint.   The roof according to claim 1, wherein the main chain skeleton of the organic polymer (A) is a polyoxyalkylene polymer (A1) or a (meth) acrylate polymer (A2).   The roof according to claim 1, wherein the main chain skeleton of the organic polymer (A) is a polyoxyalkylene polymer (A1) and a (meth) acrylic acid ester polymer (A2).   The roof according to claim 2 or 3, wherein the main chain skeleton of the polyoxyalkylene polymer (A1) is polypropylene oxide.   The roof according to any one of claims 2 to 4, wherein the main chain skeleton of the (meth) acrylate polymer (A2) is an acrylate polymer.   The roof according to any one of claims 2 to 5, wherein the main chain skeleton of the (meth) acrylic acid ester polymer (A2) is a polymer produced by a living radical polymerization method.   The roof according to any one of claims 2 to 6, wherein the main chain skeleton of the (meth) acrylic acid ester polymer (A2) is a polymer produced by an atom transfer radical polymerization method.   The roof according to any one of claims 1 to 7, wherein the elastic paint is a one-pack type elastic paint.   The roof according to any one of claims 1 to 8, wherein the thickness of the coating film obtained by curing the elastic paint is 0.1 mm to 2 mm.   A coating film having a thickness of 0.1 mm to 2 mm obtained by curing a non-aqueous and non-solvent elastic paint containing an organic polymer (A) having a silicon-containing group that can be crosslinked by forming a siloxane bond.