JP4658567B2 - Sealing material composition suitable for top coating specification, and method for applying sealing material using the same - Google Patents

Description

  The present invention relates to a sealing material composition for topcoat coating specifications comprising a room temperature curable resin excellent in durability and contamination resistance, which is cured by moisture in the air or the like to form a rubber-like elastic body, and a topcoat using the same The present invention relates to a method for applying a sealing material having excellent anti-cracking and anti-contamination properties when applied.

  Many sealing materials are used for the purpose of waterproofing, design, and the like on the outer wall joints of building structures and joints of civil engineering structures. These sealing materials prevent the intrusion of rainwater into the structure from the joints between the mortar board, concrete board, ALC board, and the outer wall of metal materials, etc., as well as temperature differences and wind pressure due to earthquakes and solar radiation. Therefore, it is required to alleviate the distortion of the outer wall material caused by the above, to prevent the destruction of the outer wall material, and to not impair the appearance of the outer wall.

  In recent years, it has been increasingly required to maintain the original performance over a long period of time for the outer wall material. That is, there is a demand for so-called high durability and long life. One way to achieve this demand for higher durability and longer life is to top-coat the exterior wall with a paint with excellent durability. This top coat must have the original function of preventing rainwater from entering by the coating film that is formed, protecting the outer wall material from heat deterioration due to solar radiation, UV deterioration, etc. and maintaining the aesthetics of the outer wall It plays an important role in the design that affects the quality of objects and civil engineering structures.

  Top coatings with excellent durability used for such purposes are often made to increase the crosslink density of the coating resin component in order to impart high durability and long life performance. As a result, the coating film tends to be hard and less stretched. In addition, to improve the appearance at the same time, and to blend more various types of inorganic and organic particles and balloons into the paint to make it look more natural, and to make full use of various paint patterns Therefore, the shape and properties of the surface are complicated.

In this way, the coating specifications using high-durability paint to achieve high durability and long life for building overviews and civil engineering structures are excellent, but the coating film is hard and has little elongation For this reason, when such a paint is applied onto the cured sealant at the joint, there is a problem that the coating film is cracked or cracked.
That is, the members that make up the outer wall are hard and highly rigid materials, so that the coating film is adapted to this, it is hard for high durability even in the top coating, and it is progressing in the direction of reducing elongation, The sealing material that fills and constructs joints that form the joints of components such as outer walls must absorb various joint displacements caused by expansion and contraction of members caused by temperature differences depending on the climate, wind pressure, earthquakes, etc. Therefore, the properties after curing are designed to be soft with low modulus and large elongation. For this reason, after the applied coating is cured, if the coating film is hard and has a small elongation, the coating film formed on the sealing material cannot follow the displacement of the sealing material, and the distortion of the coating film It is thought that it appears as a crack. Furthermore, if the sealing material composition contains a lot of liquids with poor compatibility, after the sealing material is cured, the liquid material migrates (bleeds) into the coating film, and the coated film becomes sticky, There is also a problem that dust such as dust and soot floating in the air adheres and the surface of the coating film is contaminated.

In order to improve the problem of coating surface contamination, a plasticizer made of a vinyl polymer is added instead of a low molecular weight plasticizer component contained in the sealing material, or a plasticizer and a polyol of a specific amount or less are added. Methods such as use in combination or use of process oil and castor oil-based polyol in combination have been proposed (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).
However, in the top coat specifications, cracks and cracks in the top coat are still seen, and the effect of preventing contamination by freed is still insufficient, or the contamination prevention effect is seen, but the viscosity of the compound or resin used itself However, since the viscosity of the sealing material is high, problems such as the loss of workability remain.
In this way, in the sealant composition for the top coat specification, the top coat film does not crack or break, there is no bleed to the paint, therefore it is excellent in stain resistance, and further with the outer wall material which is the base material. No sealant composition has yet been found for topcoat specifications having good adhesion, excellent durability, low dura, high elongation, and high strength.

JP 2003-313303 A JP 2002-380004 A JP 2001-316585 A

As mentioned above, in the sealing material composition for topcoat coating specifications, it does not cause cracks or cracks in the overcoated film, and is excellent in stain resistance of the coated film, and also has good adhesion to the outer wall material that is the base material. Therefore, there is a need for a sealing material composition for topcoat specifications having excellent durability, low modulus, high elongation, and high strength.
Then, this invention aims at providing the construction method using this sealing material composition while providing the sealing material composition which solved the said problem.

As a result of intensive studies in view of the above problems, the present inventors have at least a low molecular weight plasticizer in the sealing material composition used in this specification in a coating specification for an outer wall material using a highly durable top coating. By blending the plasticizer to be used, the present invention was completed by finding that there is very little bleed from the sealing material, so that there is no joint contamination even when the top coat is finished, and no cracking of the coating film occurs.
That is, the present invention provides a sealing material composition containing a room temperature curable resin, a plasticizer containing at least a low molecular weight plasticizer, and the low molecular weight plasticizer is 2 to 12% by mass in the sealing material composition. It is related with the sealing material composition suitable for top coat specifications characterized by mix | blending so that it may become.
Here, the room temperature curable resin-containing sealing material composition includes a room temperature curable resin or a room temperature curable resin, and the room temperature curable resin includes an isocyanate group-containing urethane prepolymer, a cross-linked resin. And a functional silyl group-containing resin.
Furthermore, examples of the plasticizer containing at least a low molecular weight plasticizer include a plasticizer containing a low molecular weight plasticizer and a plasticizer comprising a mixture of a low molecular weight plasticizer and a high molecular weight plasticizer. Examples of the low molecular weight plasticizer include acid esters and further diisononyl phthalate, and examples of the high molecular weight plasticizer include urethane polymer plasticizer.
In addition, the sealing material composition of the present invention includes other additives such as a weather resistance stabilizer, a thixotropic agent, a filler, an adhesion promoter, a storage stability improver (dehydrating agent), a colorant, and a curing accelerator. A catalyst or the like may be added.
Furthermore, the present invention relates to a sealing material composition suitable for the top coating specification in which the elongation of the coating film of the top coating specification of the present invention is 100% or less, and the sealing material comprising the sealing material composition of the present invention is applied to the outer wall joint. The present invention relates to a method for applying a sealing material, characterized in that when a top coat is applied after filling, the top coat is excellent in crack prevention and contamination prevention.

  The sealing material composition suitable for the topcoat coating specification of the present invention refers to a sealing material composition that is suitably used for joints of properties that employ a topcoat coating on the exterior wall of a building as a specification.

  In the present invention, the term “for top coat specification” means that any top coating material can be used for any member that constitutes the outer wall as long as it is used as a specification for coating the outer wall of a building. However, it preferably refers to the case where coating is applied to the outer wall material using a highly durable top coat whose elongation of the top coat is 100% or less.

  The components used in the sealing material composition of the present invention will be described below.

  First, the room temperature curable resin used in the present invention will be described. A room temperature curable resin is used as a curing component that cures at room temperature using moisture, oxygen in the atmosphere, or a curing agent, such as an isocyanate group-containing urethane prepolymer, a crosslinkable silyl group-containing resin, and a polysulfide resin. Can be mentioned. Of these, an isocyanate group-containing urethane prepolymer or a crosslinkable silyl group-containing resin is preferred because it can be used as a one-component moisture-curable resin and the workability of the resulting sealing material composition is good.

  The isocyanate group-containing urethane prepolymer is one in which an isocyanate group reacts with moisture (humidity) in the atmosphere to form a urea bond to crosslink and cure, and is contained in the curable composition of the present invention as a curing component. Yes, it is obtained by reacting an organic polyisocyanate and an active hydrogen-containing compound with active hydrogen (group) under an excess of isocyanate groups.

Specific examples of the organic polyisocyanate include diphenylmethane diisocyanate (MDI) such as phenylene diisocyanate, diphenyl diisocyanate, naphthalene diisocyanate, 4,4′-diphenylmethane diisocyanate, and 2,4′-diphenylmethane diisocyanate. , Toluene diisocyanates (TDI) such as 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, aromatic diisocyanates such as diphenyl ether diisocyanate, araliphatic diisocyanates such as xylylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, Aliphatic diisocyanates such as propylene diisocyanate and butylene diisocyanate, cyclohexane diisocyanate , Alicyclic diisocyanates such as methylenebis (cyclohexyl isocyanate) and isophorone diisocyanate, and carbodiimide-modified, biuret-modified, allophanate-modified, dimer, trimer or polymethylene polyphenyl polyisocyanate (crude) of these diisocyanates MDI, polymeric MDI) and the like, and these can be used alone or in combination of two or more.
Of these, aromatic diisocyanates and araliphatic diisocyanates are preferred among organic polyisocyanates, and MDIs are more preferred, particularly 4,4 ', in terms of excellent tensile adhesion after curing and water resistance. -Diphenylmethane diisocyanate is preferred.

  In addition, organic monoisocyanates such as n-butyl monoisocyanate, n-hexyl monoisocyanate, n-tetradecyl monoisocyanate, n-octadecyl monoisocyanate, p-isopropylphenyl monoisocyanate are also used for modification of the isocyanate group-containing urethane prepolymer. Can be used.

  As the active hydrogen-containing compound, in addition to a polymer polyol or polymer polyamine, a low molecular polyol, a low molecular amino alcohol, a low molecular polyamine, or a modification of an isocyanate group-containing urethane prepolymer as a chain extender used in some cases. Examples thereof include a high molecular weight polymer and a low molecular weight monool.

Examples of the polymer polyol include polyester polyol, polycarbonate polyol, polyoxyalkylene polyol, hydrocarbon polyol, poly (meth) acrylate polyol, animal and plant polyol, these copolyols, or a mixture of two or more of these. Etc.
The number average molecular weight of the polymer polyol is 500 or more, preferably 1,000 to 100,000, more preferably 1,000 to 30,000, and particularly preferably 1,000 to 20,000. If the number average molecular weight is less than 500, rubber elastic properties such as elongation after curing of the resulting curable composition deteriorate, and if it exceeds 100,000, the viscosity of the resulting isocyanate group-containing urethane prepolymer becomes too high, Since workability deteriorates, it is not preferable.

Examples of polyester polyols include succinic acid, adipic acid, sebacic acid, azelaic acid, terephthalic acid, isophthalic acid, orthophthalic acid, hexahydroterephthalic acid, hexahydroisophthalic acid, hexahydroorthophthalic acid, naphthalenedicarboxylic acid, triphthalic acid, and the like. One or more of polycarboxylic acids such as merit acid, acid esters, or acid anhydrides, ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3- Butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, neopentyl glycol, 1,8-octanediol, 1,9- Nonanediol, diethylene glycol, dipropylene glycol, 1 , 4-cyclohexanedimethanol, ethylene oxide or propylene oxide adduct of bisphenol A, low molecular polyols such as trimethylolpropane, glycerin, pentaerythritol, butylenediamine, hexamethylenediamine, xylylenediamine, isophoronediamine, etc. Examples thereof include polyester polyols or polyester amide polyols obtained by a dehydration condensation reaction with one or more low molecular amino alcohols such as low molecular polyamines, monoethanolamine, and diethanolamine.
Also, for example, lactone polyesters obtained by ring-opening polymerization of cyclic ester (lactone) monomers such as ε-caprolactone and γ-valerolactone using low molecular polyols, low molecular polyamines, and low molecular amino alcohols as initiators. A polyol is mentioned.

  Examples of the polycarbonate polyol include dehydrochlorination reaction of low molecular polyols and phosgene used in the synthesis of the polyester polyol described above, or esters of the low molecular polyols with diethylene carbonate, dimethyl carbonate, diethyl carbonate, diphenyl carbonate, and the like. What is obtained by an exchange reaction is mentioned.

Examples of the polyoxyalkylene polyol include low molecular polyols, low molecular polyamines, low molecular amino alcohols, polycarboxylic acids, sorbitol, mannitol, sucrose used for the synthesis of the above-described polyester polyols. 1 or more of cyclic ether compounds such as ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran using one or more of low molecular weight polyhydric alcohols such as saccharides such as glucose and low molecular weight polyphenols such as bisphenol A and bisphenol F as initiators A polyoxyethylene-based polyol, a polyoxypropylene-based polyol, a polyoxybutylene-based polyol, a polyoxyethylene, which is obtained by ring-opening addition polymerization or copolymerization (hereinafter, “polymerization or copolymerization” is referred to as (co) polymerization). Ramechiren polyols, poly - (oxyethylene) - (oxypropylene) - random or block copolymer polyols, further polyester polyether polyol initiator polyester polyols and polycarbonate polyols described above, such as polycarbonate polyether polyols. Moreover, the polyol which made these various polyols and organic isocyanate react by hydroxyl group excess with respect to an isocyanate group, and made the molecular terminal a hydroxyl group is also mentioned.
The number of average alcoholic hydroxyl groups per molecule of the polyoxyalkylene polyol is preferably 2 or more, more preferably 2 to 4, and particularly preferably 2 to 3.

  Furthermore, the polyoxyalkylene-based polyol is produced at the time of production thereof by cesium hydride, cesium methoxide, cesium alkoxide such as cesium ethoxide, cesium-based compounds such as cesium hydroxide, diethyl zinc, iron chloride, metalloporphyrin, phosphazenium compound, The total unsaturation obtained by using a double metal cyanide complex such as a double metal cyanide complex such as a zinc hexacyanocobaltate glyme complex or diglyme complex as a catalyst is 0.1 meq / g or less. 07 meq / g or less, particularly 0.04 meq / g or less is preferable, and molecular weight distribution [ratio of weight average molecular weight (Mw) and number average molecular weight (Mn) in terms of polystyrene by gel permeation chromatography (GPC) = Mw / Mn] is 1.6 or less, especially 1.0 Having a narrow 1.3, viscosity of the resulting diisocyanate sulfonate group-containing urethane prepolymer can reduce, and rubber elasticity properties after curing of the resulting cured composition is preferable in that is good.

In addition, for modification of an isocyanate group-containing urethane prepolymer, polyoxyl obtained by ring-opening addition polymerization of a cyclic ether compound such as propylene oxide using a low-molecular monoalcohol such as methyl alcohol, ethyl alcohol or propyl alcohol as an initiator. In some cases, polyoxyalkylene monools such as propylene monools may be used.
The “system” such as the polyoxyalkylene-based polyol or polyoxyalkylene-based monool is 50% by mass or more, further 80% by mass or more, particularly preferably 90% by mass of the portion excluding the hydroxyl group in 1 mol of the molecule. % Or more is composed of polyoxyalkylene, which means that the remaining part may be modified with ester, urethane, polycarbonate, polyamide, poly (meth) acrylate, polyolefin, etc., except for hydroxyl groups. Most preferably, 95% by mass or more of the molecules consist of polyoxyalkylene.

  Examples of the hydrocarbon polyol include polyolefin polyols such as polybutadiene polyol and polyisoprene polyol, polyalkylene polyols such as hydrogenated polybutadiene polyol and hydrogenated polyisoprene polyol, halogenated poly such as chlorinated polypropylene polyol and chlorinated polyethylene polyol. Examples include alkylene polyols.

  As a poly (meth) acrylate-based polyol, a (meth) acrylate monomer containing a hydroxyl group such as hydroxyethyl (meth) acrylate and another (meth) acrylic acid alkyl ester monomer are used as a radical polymerization initiator. And those copolymerized in the presence or absence of.

  Examples of animal and plant-based polyols include castor oil-based diols.

As the chain extender, in addition to the low molecular weight polyols, polyamines and amino alcohols used in the synthesis of the polyester polyol, the polyoxyalkylene polyol described above has a low molecular weight with a number average molecular weight of less than 500, Or the mixture of these 2 or more types is illustrated.
The compounds mentioned as the active hydrogen-containing compound can be used alone or in combination of two or more, but among these, the rubber elastic properties and adhesiveness of the resulting curable composition are good, High molecular polyols are preferred, polyoxyalkylene polyols are more preferred, and polyoxypropylene polyols are most preferred.

  The isocyanate group-containing urethane prepolymer in the present invention can be synthesized by either a batch charge reaction method or a multistage charge reaction method, but it is necessary to leave an isocyanate group in the molecule of the prepolymer. The isocyanate group / active hydrogen (group) equivalent ratio of the isocyanate group of the organic isocyanate and the polymer polyol and optionally the active hydrogen (group) of the active hydrogen-containing compound such as a chain extender is 1.1 to 5.0. /1.0 is preferable, and 1.3 to 2.0 / 1.0 is more preferable. The isocyanate group-containing urethane prepolymer thus obtained preferably has an isocyanate group content of 0.1 to 15.0% by mass, particularly preferably 0.3 to 10.0% by mass, and most preferably 0.4 to 5.0% by mass. When the isocyanate group content is less than 0.1% by mass, the molecular weight becomes too large, the viscosity increases, and the workability decreases. Moreover, since there are few crosslinking points in a prepolymer, sufficient adhesiveness cannot be obtained. When the isocyanate group content exceeds 15.0% by mass, it is difficult to prevent foaming due to carbon dioxide gas generated by the reaction of the isocyanate group with moisture, such being undesirable.

  In the synthesis of the isocyanate group-containing urethane prepolymer in the present invention, a known catalyst similar to the compound mentioned as the curing acceleration catalyst described later can be used as the urethanization catalyst. Among these, metal organic acid salts and salts of organic metals and organic acids are preferable, and dibutyltin dilaurate is particularly preferable. Furthermore, a known organic solvent can be used.

Next, the crosslinkable silyl group-containing resin will be described.
Examples of the crosslinkable silyl group-containing resin include what is generally called a modified silicone resin. It is a resin containing 0.5 or more crosslinkable silyl groups in the molecule, which reacts with moisture in the atmosphere to form a siloxane bond and crosslink to form a rubber-like cured product.
Examples of the modified silicone resin include JP-A-52-73998, JP-A-55-9669, JP-A-59-122541, JP-A-60-6747, JP-A-61-233043. JP-A-63-112642, JP-A-3-79627, JP-A-4-283259, JP-A-5-70531, JP-A-5-287186, JP-A-11-80571, Examples disclosed in JP-A-11-116763 and JP-A-11-130931 can be mentioned. Specifically, the main chain contains 0.5 or more crosslinkable silyl groups in the molecule and the main chain is a polyoxyalkylene polymer, a vinyl-modified polyoxyalkylene polymer, a vinyl polymer, polyisoprene or polybutadiene. And diene polymers, polyester polymers, acrylic and / or methacrylic (hereinafter referred to as (meth) acrylic) acid ester polymers, polysulfide polymers, copolymers and mixtures thereof.
The main chain of the modified silicone resin is preferably a polyoxyalkylene polymer, more preferably a polyoxypropylene polymer, from the viewpoint of physical properties such as tensile adhesion after curing and modulus.

（式中、Ｒは炭化水素基であり、炭素数１〜２０のアルキル基、炭素数６〜２０のアリール基又は炭素数７〜２０のアラルキル基が好ましく、メチル基が最も好ましい。Ｘはハロゲン原子、水素原子、水酸基、アルコキシ基、アシルオキシ基、ケトキシメート基、アミド基、酸アミド基、メルカプト基、アルケニルオキシ基、およびアミノオキシ基より選ばれる反応基であり、Ｘが複数の場合はＸは同じ基であっても異なっていてもよい。このうちＸはアルコキシ基が好ましく、メトキシ基又はエトキシ基が最も好ましい。ａは０、１又は２の整数であり、０又は１が最も好ましい。） It is preferable that 0.5-5 crosslinkable silyl groups are contained in a molecule | numerator from points, such as the sclerosis | hardenability of a composition and the physical property after hardening. Further, the crosslinkable silyl group is preferably one represented by the following general formula (1) which is easily crosslinked and easily produced.

(In the formula, R is a hydrocarbon group, preferably an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms or an aralkyl group having 7 to 20 carbon atoms, and most preferably a methyl group. X is a halogen. A reactive group selected from an atom, a hydrogen atom, a hydroxyl group, an alkoxy group, an acyloxy group, a ketoximate group, an amide group, an acid amide group, a mercapto group, an alkenyloxy group, and an aminooxy group. (X may be an alkoxy group, most preferably a methoxy group or an ethoxy group, and a is an integer of 0, 1 or 2, with 0 or 1 being most preferred.)

The crosslinkable silyl group can be introduced into the main chain by the following known method.
(1) A polyoxyalkylene polymer having a functional group such as a hydroxyl group at a terminal is reacted with an organic compound (for example, allyl isocyanate) having an active group and an unsaturated group reactive to the functional group, Hydrosilation having hydrolyzable groups is allowed to act on the resulting reaction product to effect hydrosilylation.
(2) A compound having a functional group and a crosslinkable silyl group reactive to this functional group to a polyoxyalkylene polymer having a functional group such as a hydroxyl group, an amino group, an epoxy group or an isocyanate group at the terminal. React. The compound having a reactive functional group and a crosslinkable silyl group includes amino group-containing silanes, mercapto group-containing silanes, epoxy group-containing silanes, vinyl unsaturated bond-containing silanes, chlorine atom-containing silanes, Examples include isocyanate group-containing silanes and hydrosilanes.
(3) A compound having a polymerizable unsaturated bond and a crosslinkable silyl group (for example, CH ₂ ═CHSi (OCH ₃ ) ₃ ) and a (meth) acrylic acid alkyl ester monomer are copolymerized.
(4) A compound having a polymerizable unsaturated bond and a functional group (for example, hydroxyethyl (meth) acrylate) is added to a (meth) acrylic acid alkyl ester monomer for copolymerization, and then the resulting copolymer is the above-mentioned copolymer And a compound having a reactive functional group and a crosslinkable silyl group (for example, a compound having an isocyanate group and —Si (OCH ₃ ) ₃ group) are reacted.
The number average molecular weight of the crosslinkable silyl group-containing resin is 1,000 or more, particularly 6,000 to 30,000, and a narrow molecular weight distribution is easy to handle because the viscosity before curing is low, and the strength, modulus and elongation after curing. It is preferable because of its excellent physical properties.

Next, the plasticizer will be described.
The plasticizer containing at least the low molecular weight plasticizer in the present invention may be a part or all of the plasticizer component of the low molecular weight plasticizer, but is a sealing material suitable for top coating specifications. Reduce the viscosity of the composition to improve workability,
In order to achieve both prevention of cracking and prevention of contamination of the overcoated film, the plasticizer component is preferably a mixture of a low molecular weight plasticizer and a high molecular weight plasticizer. The low molecular weight plasticizer adjusts the rubber properties such as modulus and elongation after curing of the sealant composition,
In order to impart high durability as described above, the low-molecular weight plasticizer should be transferred to a small amount (bleed) to a level that does not cause contamination to soften the hard coating film. Therefore, it is indispensable for the coating film to exhibit the effect of making it difficult to generate cracks by making it possible to follow changes such as elongation of the cured sealing material caused by joint displacement. However, in order to reduce the viscosity of the sealing material composition, if only a small amount of low molecular weight plasticizer is used, a large amount of bleed occurs on the overcoated film, and the durability of the coated film is reduced, and dust or the like is formed on the surface of the coated film. Therefore, it is necessary to suppress the amount of the low molecular weight plasticizer to an appropriate amount in order to achieve both excellent prevention of cracking and prevention of contamination of the coating film. For this reason, a high molecular weight plasticizer is used in combination for the purpose of compensating for the insufficient viscosity reduction of the sealing material composition. Since the high molecular weight plasticizer is difficult to bleed into the overcoated film, it exhibits the effect of reducing the viscosity of the sealing material composition without contaminating the coated film.

  The plasticizer including at least the low molecular weight plasticizer is preferably 2 to 35% by mass, more preferably 2 to 25% by mass, based on the whole sealing material composition. Furthermore, as for the ratio of the low molecular weight plasticizer and the high molecular weight plasticizer, the mass ratio of high molecular weight plasticizer / low molecular weight plasticizer is preferably 0 to 16.5, and more preferably 0.1 to 12.

  Specific examples of the low molecular weight plasticizer include phthalates such as dibutyl phthalate, diheptyl phthalate, dioctyl phthalate, di (2-ethylhexyl) phthalate, diisononyl phthalate, butyl benzyl phthalate and butyl phthalyl butyl glycolate, and dioctyl. Suitable examples include non-aromatic dibasic acid esters such as adipate and dioctyl sebacate, and acid esters such as phosphate esters such as tricresyl phosphate and tributyl phosphate. However, phthalic acid esters are preferred and diisononyl phthalate is more preferred because of improved workability due to viscosity reduction when blended, ease of rubber property adjustment, low bleed contamination, and reduced environmental burden. The low molecular weight plasticizer is preferably blended in the sealing material composition so as to be 2 to 12% by mass. If it is less than 2% by mass, there is no effect of preventing cracks on the top coat film, and if it exceeds 12% by mass, the amount of bleed to the film increases and contamination is likely to occur. The number average molecular weight is preferably less than 1,000. Outside this range, it is difficult to achieve both the effect of reducing the viscosity when blended and the fact that there is very little bleeding.

  As the high molecular weight plasticizer, the same polyoxyalkylene polyol used for the synthesis of the above-mentioned isocyanate group-containing urethane prepolymer, or a polyether plasticizer obtained by etherification or esterification thereof, a urethane polymer Examples include plasticizers, polybutadiene, butadiene-acrylonitrile copolymers, polychloroprene, polyisoprene, and hydrocarbon polymers such as hydrogenated products thereof. Among these, polyurethane polymer plasticizers are isocyanate group-containing urethane prepolymers. It is preferable in terms of good compatibility with the polymer.

  As the urethane polymer plasticizer, a reaction product of a polyoxyalkylene compound having active hydrogen and an isocyanate group-containing compound is preferable, and a urethane polymer plasticizer containing substantially no hydroxyl group or isocyanate group is preferable. Specifically, a polyoxyalkylene alcohol and an organic isocyanate are suitably produced by reacting them in an isocyanate group / hydroxyl group equivalent ratio of 0.9 to 1.1 / 1.0, most preferably 1/1. can do. When the equivalence ratio is less than 0.9 / 1.0, the hydroxyl group content increases, and when blended, the water resistance and storage stability of the sealing material deteriorates. This is not preferable because the content of is increased and the adverse effect on the physical properties of the rubber after curing cannot be ignored. The number average molecular weight is 1,000 or more, preferably 1,000 to 60,000, and more preferably 2,000 to 20,000. Outside this range, it is difficult to achieve both the effect of reducing the viscosity when blended and the fact that there is very little bleeding.

  Note that the term “substantially free of hydroxyl groups or isocyanate groups” means that a small amount of hydroxyl groups or isocyanate groups may remain in the urethane polymer plasticizer depending on the selection of the reaction equivalent ratio. This means that there is no influence on the physical properties of the product, and there is no problem even if it is regarded as not containing.

  Examples of polyoxyalkylene alcohols that are active oxygen-containing polyoxyalkylene compounds include polyoxyalkylene monools, polyoxyalkylene polyols similar to those used in the synthesis of the aforementioned isocyanate group-containing urethane prepolymers, these In order to reduce the viscosity and obtain a high molecular weight compound with very little bleeding, polyoxyalkylene monools are preferred. The polyoxyalkylene monool is obtained by ring-opening addition polymerization of alkylene oxide to an initiator such as an alkyl compound having one active hydrogen. Examples of the initiator include methanol, ethanol, n-propanol, iso-propanol, n-butanol, iso-butanol, tert-butanol, cyclohexanol, phenol, and a mixture of two or more thereof. Then, compounds having 5 or less carbon atoms such as methanol and ethanol are preferable. Examples of the alkylene oxide include ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, and a mixture of two or more thereof. Among these, propylene oxide is preferable. Furthermore, polyoxyalkylene monools are cesium compounds (cesium hydroxide, cesium methoxide, cesium alkoxides such as cesium ethoxide, cesium hydroxide), diethyl zinc, iron chloride, metal porphyrin, The total unsaturation obtained by using a complex metal cyanide complex such as a phosphazenium compound, a complex metal cyanide compound, such as a zinc hexacyanocobaltate glyme complex or a diglyme complex, is 0.1 meq / g or less, and further 0.07 meq. / G or less, particularly 0.04 meq / g or less is preferred, and molecular weight distribution [ratio of weight average molecular weight (Mw) and number average molecular weight (Mn) in terms of polystyrene by gel permeation chromatography (GPC) = Mw / Mn ] Is 1.6 or less, especially 1.0-1. A narrow number of 3 is preferred. In particular, in order to obtain a low-viscosity liquid urethane compound, it is preferable to use a polyoxyalkylene monool having a narrow molecular weight distribution. In the present invention, the polyoxyalkylene monool is 50% by mass or more, more preferably 80% by mass or more, and preferably 90% by mass or more of the portion excluding the hydroxyl group of 1 mol of the molecule. Means that the remaining part may be modified with ether, urethane, ester, polycarbonate, polyamide, polyacrylate, polyolefin, etc., but in the present invention, 95% by mass or more of the molecule excluding the hydroxyl group. Is most preferably a monool comprising polyoxyalkylene, and a polyoxypropylene monool is preferred.

Examples of the isocyanate group-containing compound include the same organic polyisocyanates, organic monoisocyanates, and mixtures thereof used in the synthesis of the aforementioned isocyanate group-containing urethane prepolymers. An aliphatic diisocyanate, an alicyclic diisocyanate, and an araliphatic diisocyanate are preferable, an araliphatic diisocyanate is more preferable, and xylylene diisocyanate is particularly preferable in that the viscosity of the plasticizer can be lowered.
When synthesizing urethane polymer plasticizers, the same urethanization catalyst as used for the synthesis of the above-mentioned isocyanate group-containing urethane prepolymer can be used as a reaction catalyst, and a known organic solvent is used. You can also

  Additives that can be further used in the present invention are for improving weather resistance, imparting thixotropic properties, increasing and reinforcing, improving adhesion, improving storage stability (storage stability), coloring, accelerating curing, etc. , Weathering stabilizers, thixotropic agents, fillers, adhesion promoters, storage stability improvers (dehydrating agents), colorants, curing accelerators, and the like.

  The weather stabilizer is used to prevent oxidation, light degradation, and thermal degradation of the cured product and further improve not only the weather resistance but also the heat resistance. Specific examples of the weather stabilizer include an antioxidant and an ultraviolet absorber.

  Antioxidants include hindered phenol-based antioxidants such as pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl- 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], N, N′-hexane-1,6-diylbis [3- (3,5-di-tert-butyl-4-hydroxy Phenylpropioamide], benzenepropanoic acid 3,5-bis (1,1-dimethylethyl) -4-hydroxy C7-C9 side chain alkyl ester, 2,4-dimethyl-6- (1-methylpentadecyl) phenol, etc. Is mentioned.

Examples of the ultraviolet absorber include benzotriazole-based ultraviolet absorbers such as 2- (3,5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole, and 2- (4,6-diphenyl- 1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol and other triazine-based UV absorbers, benzophenone-based UV absorbers such as octabenzone, 2,4-di-tert-butyl Examples thereof include benzoate ultraviolet absorbers such as phenyl-3,5-di-tert-butyl-4-hydroxybenzoate.
These weather stabilizers can be used alone or in combination of two or more.

  The weathering stabilizer is preferably blended in an amount of 0.01 to 30 parts by weight, particularly 0.1 to 10 parts by weight, based on 100 parts by weight of the room temperature curable resin.

  The thixotropic agent is used to impart thixotropic properties to the sealing material composition of the present invention so that no sagging (slump) occurs when the composition is filled or applied to a vertical surface such as a building outer wall. Examples thereof include inorganic thixotropic agents such as colloidal silica and organic surface-treated calcium carbonate, organic thixotropic agents such as organic bentonite and fatty acid amide, etc. Two or more kinds can be appropriately selected and added. Of these, colloidal silica is preferable because it can impart thixotropy with a small amount of blending, but if a curing accelerating catalyst described later is used in order to increase the curing rate of the curable composition, the thixotropic structure is destroyed and the vertical plane is broken. The use of organic surface-treated calcium carbonate, which may cause sagging when filled or applied, may be limited. However, organic surface-treated calcium carbonate does not have such disadvantages and imparts stable thixotropic properties to the sealing material composition. It is particularly preferable because it can be used.

  In the present invention, the thixotropic agent is preferably used in an amount of 1 to 200 parts by weight, more preferably 5 to 150 parts by weight, based on 100 parts by weight of the room temperature curable resin. If the amount is less than 1 part by weight, the thixotropic effect is lost, and if it exceeds 200 parts by weight, the viscosity of the resulting sealing material composition is increased and workability is deteriorated.

  Fillers include synthetic silica such as mica, kaolin, zeolite, graphite, diatomaceous earth, white clay, clay, talc, silicic anhydride, quartz, aluminum powder, zinc powder, precipitated silica, calcium carbonate, calcium hydroxide, magnesium carbonate Inorganic filler such as alumina, fibrous filler such as glass fiber and carbon fiber, inorganic filler such as glass balloon, shirasu balloon, silica balloon, ceramic balloon and other inorganic balloon filler, wood powder Organic, such as walnut flour, rice husk flour, pulp powder, cotton chips, rubber powder, fine powder of thermoplastic or thermosetting resin, polyethylene powder or hollow body, organic balloon filler such as Saran microballoon Other fillers, flame retardant fillers such as magnesium hydroxide and aluminum hydroxide, etc. Among them, those having a particle size 0.01~1,000μm are preferred. These can be used alone or in combination of two or more.

  Examples of the adhesion-imparting agent include epoxy resins, phenol resins, alkyl titanates, and organic polyisocyanates in addition to the coupling agent.

  Examples of the coupling agent include various coupling agents such as silane-based, aluminum-based, and zircoaluminate-based compounds or partial hydrolysis condensates thereof. Among these, the silane-based coupling agent or partial hydrolyzate thereof is It is preferable because of its excellent adhesiveness.

  Specific examples of the silane coupling agent include methyl silicate, methyltrimethoxysilane, ethyltrimethoxysilane, butyltrimethoxysilane, octyltrimethoxysilane, dodecyltrimethoxysilane, phenyltrimethoxysilane, vinyltrimethoxy. Silane, 3-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, dimethyldimethoxysilane, diethyldimethoxysilane, dibutyldimethoxysilane, diphenyldimethoxy Silane, vinylmethyldimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, trimethylmethoxysilane, triethylmethoxysilane, tri Phenylmethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-amino Low molecular weight compounds containing alkoxysilyl groups such as propylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, etc., having a molecular weight of 500 or less, preferably 400 or less, or these silane-based cups A compound having a molecular weight of 200 to 3,000 may be mentioned as one or two or more partially hydrolyzed condensates of the ring agent. These can be used alone or in combination of two or more.

  Examples of the storage stability improver include vinyltrimethoxysilane, calcium oxide, magnesium oxide, p-toluenesulfonyl isocyanate which reacts with moisture present in the composition, and these may be used alone or in combination of two or more. Can be used.

Examples of the colorant include inorganic pigments such as titanium oxide and iron oxide, organic pigments such as copper phthalocyanine, and carbon black.
These can be used alone or in combination of two or more.

Examples of the curing accelerating catalyst include metals such as zinc, tin, lead, zirconium, bismuth, cobalt, manganese, iron, such as metal alkoxides such as tetra-n-butyl titanate, stannous octylate and tin octenoate. Salts with organic acids such as octylic acid, octenoic acid, naphthenic acid, metal chelate compounds such as dibutyltin bis (acetylacetonate), zirconium tetrakis (acetylacetonate), titanium tetrakis (acetylacetonate), dibutyltin dilaurate , Salts of organic metals and organic acids such as dioctyltin dilaurate, triethylenediamine, triethylamine, tri-n-butylamine, hexamethylenetetramine, 1,8-diazabicyclo [5,4,0] undecene-7 (DBU), 1 , 4-Diazabicyclo [2,2,2] octane Tertiary amines such as (DABCO), N-methylmorpholine and N-ethylmorpholine, or salts of these amines with organic acids. These can be used alone or in combination of two or more. Of these, a metal chelate compound or a salt of an organic metal and an organic acid is preferable, and dibutyltin dilaurate is more preferable because it has a high effect of promoting curing.
The curing accelerating catalyst is preferably blended in an amount of 0 to 10 parts by weight, particularly 0.01 to 2 parts by weight, based on 100 parts by weight of the room temperature curable resin, from the viewpoint of curing speed and physical properties of the cured product.

  The total amount of the filler, the adhesion-imparting agent, the storage stability improver, the colorant and the curing accelerating catalyst is 0 to 500 parts by weight, particularly 5 to 300 parts by weight, based on 100 parts by weight of the room temperature curable resin. Preferably there is.

  In the sealing material composition of the present invention, each additive component may be used alone or in combination of two or more.

  In the present invention, if necessary, ester solvents such as ethyl acetate, ketone solvents such as methyl ethyl ketone, aliphatic solvents such as n-hexane, alicyclic solvents such as cyclohexane, aromatics such as toluene and xylene. Conventionally known organic solvents such as petroleum solvents such as petroleum solvents, kerosene, mineral spirits, and industrial gasoline can be used. However, it is necessary that it does not react with each component of the room temperature curable sealing material composition. The amount used is 20% by mass or less, more preferably 10% by mass or less, in the room temperature curable sealing material composition.

  The method for producing the sealing material composition in the present invention is not particularly limited. For example, a room temperature curable resin, a plasticizer component, and, optionally, an additive are charged into a stirrer / mixer that can block moisture with stainless steel, iron, etc., under normal pressure, under reduced pressure, under pressure, under nitrogen flow It can be produced by stirring and mixing batchwise or continuously under various conditions such as below. Examples of the agitation and mixing device include a planetary mixer, a kneader, an agitator, a nauta mixer, and a line mixer. Since the produced sealing material composition is thickened and hardened by moisture or the like, it is preferably stored in a container that can block moisture and the like in order to maintain the storage stability of the contents, and sealed and stored. The container may be anything as long as it is capable of blocking moisture and the like, and examples include various kinds of containers such as drum cans, metal or synthetic resin pail cans and bag-like containers, and paper or synthetic resin cartridge-like containers. It is done.

The sealing material composition of the present invention can be used as a one-pack type or a two-pack type depending on the application, but there is no need to mix the main agent and the curing agent, and there is no problem such as poor curing due to poor mixing, and workability is improved. Since it is excellent, a one-pack type sealant composition is preferable, and a one-part moisture curable sealant composition is more preferable.
Although the construction method of the room temperature curable sealing material composition for topcoat application specification of this invention is demonstrated, it is not limited to this. First, dirt such as dust adhering to the joints formed on the outer wall of the building is removed and cleaned using a brush or cloth. After that, a bond breaker or a backup material for preventing three-sided adhesion is loaded, and then a masking tape is applied to both sides of the joint along the joint. A primer is applied so that the sealant composition is sufficiently adhered to the substrate. After leaving for a predetermined time of about 30 minutes, the sealing material composition is filled and applied. Filling and installing the sealing material composition, cut the nozzle to fit the joint width, load it into the extrusion gun, open the container such as the cartridge, place the nozzle on the joint bottom, push the sealing material through the nozzle, To fill. Next, an excess sealing material is scraped off using a spatula made of metal or the like, the surface of the sealing material is finished smoothly, the masking tape is removed before the surface of the sealing material is cured, and the sealing material is cured and cured.
Equipment for extruding the sealing material includes a manual extruding gun, a conductive type, and an apparatus using air pressure, which are appropriately selected.

  Next, the top coating process is started. After a predetermined curing period of the sealant composition, the top coat paint is applied to the entire surface to be coated, including the sealant composition filling joints, using a device such as a spray gun, roller, brush, spatula, or iron, Finish by curing. Examples of the top coating include water-based paints such as water-based acrylic paints, water-based acrylic silicone paints, and water-based urethane paints, epoxy-based paints, and urethane solvent-based paints. Further, a highly durable and long-life water-based paint having an extension of the coating film of the top coat specification of 100% or less at room temperature and further 70% or less is particularly preferable.

  The construction method of the present application may be any member that constitutes the outer wall as long as it is a top coat coating specification, and therefore is not limited, but it forms a highly durable, long-life, hard, low-elongation coating film. In the case of using concrete, mortar, ceramics siding, ALC plate, especially ALC plate as a building exterior material using a paint having a top coating specification to be used, the effect of the present invention can be maximized, which is preferable.

(Synthesis Example 1)
Polyoxypropylene glycol (Asahi Glass Co., Ltd., Exenol 3021, number average molecular weight 3,200, molecular weight distribution (Mw / Mn) while flowing nitrogen gas into a reactor equipped with a stirrer, thermometer, nitrogen seal tube and heating / cooling device 1.1 to 1.2) 340 g, polyoxypropylene triol (Mitsui Chemicals, MN-4000, number average molecular weight 4,000, molecular weight distribution (Mw / Mn) 1.1 to 1.2) 100 g, 90 g of petroleum solvent (Nippon Mining Co., Cactus Solvent) is charged, and 54 g of 4,4′-diphenylmethane diisocyanate (manufactured by Nippon Polyurethane Industry Co., Ltd., Millionate MT, molecular weight 250) is added while stirring. Add 0.05 g of dibutyltin dilaurate and react at 70-80 ° C. with stirring for 2 hours. The reaction was terminated when the Aneto group content is below the theoretical value (1.04 wt%) was synthesized an isocyanate group-containing urethane prepolymer P-1 by cooling.
The obtained isocyanate group-containing urethane prepolymer P-1 was a viscous transparent liquid at room temperature with an isocyanate group content of 1.00% by mass and a viscosity of 32,000 mPa · s at 25 ° C.

[Synthesis Example 2]
A polyoxypropylene monool (manufactured by Asahi Glass Co., Ltd., XS-M3000, number average molecular weight 3,243, molecular weight distribution (Mw / Mn) was introduced into a reaction vessel equipped with a stirrer, thermometer, nitrogen seal tube and heating / cooling device. Mn) 1.0 to 1.1) 300 g (OH equivalent: 0.0925) was charged, and while stirring, 0.1 g of dibutyltin dilaurate and m-xylylene diisocyanate (Takeda 500, Takenate 500, molecular weight 188) 9 0.1 g (NCO equivalent: 0.0968) (R value (NCO equivalent / OH equivalent = 1.05) was added, and the mixture was heated and stirred at 70-80 ° C. for 4 hours. The reaction was terminated when the value (0.06% by mass) or less was reached, and a liquid urethane polymer plasticizer U-1 was produced.
This liquid urethane polymer plasticizer U-1 has a measured isocyanate group content of 0.04 mass% by titration, a viscosity of 3,300 mPa · s / 25 ° C., and a molecular weight distribution (Mw / Mn) of 1.0 to 1. 1. It was a transparent liquid at room temperature.

[Example 1]
100 g of the isocyanate group-containing urethane prepolymer P-1 obtained in Synthesis Example 1 while flowing nitrogen gas into a kneading vessel equipped with a cooling device and a nitrogen seal tube, and diisononyl phthalate (DINP, molecular weight 419, manufactured by Shin Nippon Rika Co., Ltd.) 8 .1 g, 41.9 g of a liquid urethane polymer plasticizer U-1 having substantially no isocyanate group and hydroxyl group, 10 g of petroleum solvent (Cactus Solvent manufactured by Nippon Mining Co., Ltd.), 10 g of titanium oxide, 3- 0.5 g of glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., KBM403), hindered phenol antioxidant (manufactured by Ciba Specialty Chemicals, IRGANOX 1010, pentaerythritol tetrakis [3- (3,5- Di-tert-butyl-4-hydroxyphenyl) propionate]) They were charged, at 60 ° C. or less, and the mixture was stirred, kneaded until the contents became homogeneous. Subsequently, 100 g of fatty acid surface-treated calcium carbonate (Shiraishi Kogyo Co., Ltd., Hakujyo Hana CCR) dried in an oven at 80 to 100 ° C. for 1 day in advance and 0.05 g of dibutyltin dilaurate were sequentially charged and further kneaded until uniform. Subsequently, it was degassed under reduced pressure at 30 to 100 hPa, filled in a container, and sealed to prepare a paste-like one-component moisture-curable urethane-based sealing material composition.

[Example 2]
In Example 1, instead of 8.1 g of diisononyl phthalate (manufactured by Shin Nippon Rika Co., Ltd., DINP, molecular weight 419) and 41.9 g of urethane polymer plasticizer U-1, 13.6 g of diisononyl phthalate, urethane type high A paste-like one-component moisture-curable urethane-based sealing material composition was prepared in the same manner except that 36.4 g of the molecular plasticizer U-1 was used.

Example 3
In Example 1, instead of 8.1 g of diisononyl phthalate (Shin Nippon Rika Co., Ltd., DINP, molecular weight 419) and urethane polymer plasticizer U-141.9 g, 24.4 g of diisononyl phthalate, urethane polymer plastic A paste-like one-component moisture-curable urethane-based sealing material composition was prepared in the same manner except that 25.6 g of the agent U-1 was used.

Example 4
In Example 2, a hydrolyzable silyl group-containing polyoxypropylene polymer (manufactured by Kaneka Corporation, S-303) was used instead of the isocyanate group-containing urethane prepolymer P-1 obtained in Synthesis Example 1. Thus, a paste-like one-component moisture-curable silyl group-containing polyoxypropylene-based sealing material composition was prepared.

[Comparative Example 1]
In Example 1, a paste-like one-component moisture-curable urethane-based sealing material composition was prepared in the same manner except that 50 g of the urethane-based polymer plasticizer U-1 was used without using diisononyl phthalate. .

[Comparative Example 2]
In Comparative Example 1, a paste-like one-component moisture-curable urethane-based sealing material composition was prepared in the same manner except that 50 g of diisononyl phthalate was used instead of 50 g of the urethane-based polymer plasticizer U-1. .

Test Method Using the one-component moisture-curable urethane-based sealant composition and the one-component moisture-curable crosslinkable silyl group-containing resin sealant composition obtained in Examples 1 to 4 and Comparative Examples 1 and 2 below Was tested.
(1) Cracking of the coating film The sealing material composition was formed into a sheet having a thickness of 3 mm, cured at 23 ° C. and 50% relative humidity for 3 days, and further water-based acrylic silicone paint (manufactured by Fujikura Kasei Co., Ltd., ceramic tone fleck, coating) Amount: 300-500 g / m ² ) of each of the top coat and the intermediate coat was applied and cured at 23 ° C. and 50% relative humidity for 14 days. Next, it cut out into the strip shape of width 25mm length 100mm, and heat-processed at 80 degreeC for 7 days. This sample was allowed to stand at 5 ° C. for 24 hours or longer and then a tensile tester with a thermostatic bath was used to conduct a tensile test at 5 ° C., a tensile speed of 5 mm / min, and a distance between marked lines of 40 mm. The elongation when the crack occurred in the coating film was determined and evaluated.
The judgment criteria in this case are as follows.
○: Elongation rate is 5% or more.
X: Elongation rate is less than 5%.
In addition, the elongation of the coating film of water-based acrylic silicone paint (manufactured by Fujikura Kasei Co., Ltd., ceramic tone fleck, top coat and intermediate coat each 300 to 500 g / m ² ); 40 to 50% or less (23 ° C., 50% relative humidity for 7 days , Specimen shape width 20 mm × length 100 mm, tensile speed 20 mm / min · 23 ° C.).

(2) Contamination property A test specimen was prepared as follows. A 5 mm thick slate plate was used to produce a joint having a width of 25 mm, a depth of 15 mm, and a length of 150 mm. The sealant composition is filled in the joint, and the excess composition is scraped off with a spatula to finish the surface flat. Next, it was cured for 14 days in a standard state (23 ° C. and 50% relative humidity), and the sealing material composition was cured. Aqueous acrylic silicone paint (manufactured by Fujikura Kasei Co., Ltd., ceramic tone flex, coating amount: 300 for each of top coat and intermediate coat) ˜500 g / m ² ) was applied with a brush, and further cured for 14 days in a standard state (23 ° C. and 50% relative humidity) to obtain a test specimen.
Next, after heat-treating a test body for 30 days in an 80 degreeC thermostat, it takes out from a thermostat and sprinkles black quartz sand (particle diameter of 70-110 micrometers) on the surface of a test body. Immediately turn the specimen over and tap the surface with your hand to remove excess black silica sand. The state of the black silica sand (dirt) remaining on the surface was visually observed to evaluate the contamination.
Judgment criteria are as follows.
○: Black silica sand is not adhered to the surface of the water-based acrylic silicone paint on the surface, and the surface is clean.
X: A state in which black silica sand adheres to the surface of the water-based acrylic silicone paint surface on the surface and becomes dirty.

(3) Extrudability Measured (measurement temperature: 23 ° C.) in accordance with “4.14 Extrusion Test with Cartridge for Testing” of JIS A1439: 1997 “Testing Method of Sealant for Building”. Those having an extrusion time of 5 seconds or less were evaluated as ◯.

(4) Slump The slump (longitudinal) was measured (measurement temperature: 23 ° C.) in accordance with “4.1 slump test” in JIS A1439: 1997 “Testing method of sealing material for building”.

(5) Tack-free Measured in accordance with “4.19 Tack-free test” in JIS A1439: 1997 “Testing method of sealing material for building” (measurement temperature: 23 ° C.). A tack-free time of 5 hours or less was rated as “good”.

(6) Elongation The sealing material composition was applied onto a release paper so as to form a sheet having a thickness of about 2 mm, cured at 23 ° C. and 50% relative humidity for 14 days, cured, and then released from the release paper. K6251: 1993 A vulcanized rubber physical test method punched into a No. 3 type dumbbell was used as a test piece, and the elongation at the time of cutting the cured product was measured at a test temperature of 23 ° C. An elongation of 200% or more was evaluated as ◯.

These results are shown in Table 1 below.

As described above, the sealing material composition of the present invention and the construction method using the sealing material have excellent effects of adjusting the rubber physical properties such as modulus and elongation after curing, and further preventing the occurrence of cracks in the top coating and causing very little bleed contamination. It plays.

Claims (8)

A plasticizer that is a mixture of a low molecular weight plasticizer and a high molecular weight plasticizer is added to a sealant composition containing a room temperature curable resin, and the low molecular weight plasticizer is 2 to 12% by mass in the sealant composition. a sealant composition suitable for top coating specifications for formulated such that the number average molecular weight of the low molecular weight plasticizer is less than 1,000, the high molecular weight plasticizer, the total degree of unsaturation Polyoxyalkylene system having a ratio (Mw / Mn) of not more than 0.1 meq / g and a polystyrene-reduced weight average molecular weight (Mw) and number average molecular weight (Mn) by gel permeation chromatography of not more than 1.6 A sealing material composition having a number average molecular weight of 1,000 or more comprising a reaction product of monool and aliphatic, alicyclic or araliphatic diisocyanate Thing . The sealant composition suitable for topcoat specification according to claim 1, wherein the low molecular weight plasticizer is an acid ester. The sealant composition suitable for topcoat specification according to claim 1 or 2 , wherein the low molecular weight plasticizer is diisononyl phthalate. The sealing material composition suitable for topcoat coating specifications as described in any one of Claims 1-3 whose said normal temperature curable resin is an isocyanate group containing urethane prepolymer. The sealing material composition suitable for topcoat coating specifications as described in any one of Claims 1-4 whose said normal temperature curable resin is crosslinkable silyl group containing resin. The sealing material composition further includes at least one additive selected from the group consisting of a weather resistance stabilizer, a thixotropic agent, a filler, an adhesion promoter, a storage stability improver, a colorant, and a curing accelerator catalyst. The sealing material composition suitable for the topcoat specification as described in any one of Claims 1-5 . The sealant composition suitable for the topcoat specification according to any one of claims 1 to 6 , wherein the elongation of the coating film of the topcoat specification is 100% or less. The top coating film has excellent anti-cracking and anti-fouling properties when the top coating is applied after filling the outer wall joint with the sealing material composition for top coating specification according to any one of claims 1 to 7. A sealing material construction method characterized by