JP2016017024A - Aqueous polyurethane composition and method for applying the same on floor substrate concrete - Google Patents
Aqueous polyurethane composition and method for applying the same on floor substrate concrete Download PDFInfo
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Description
本発明は、塗床材として適したモルタル状の水硬性ポリマーセメント組成物に関し、詳しくは、ポリオール、ポリイソシアネート、希釈剤、セメント、骨材及び水を含有して成る水硬性ポリマーセメント組成物であって、組成物全体を１００重量部とするとセメント及び骨材から成る骨材部は７５〜９０重量部であるような骨材部の含有量が多い水硬性ポリマーセメント組成物及びこの床下地コンクリートへの施工方法に関する。 The present invention relates to a mortar-like hydraulic polymer cement composition suitable as a coating material, and more particularly, to a hydraulic polymer cement composition comprising a polyol, a polyisocyanate, a diluent, cement, aggregate and water. In addition, the hydraulic polymer cement composition having a high aggregate content such that the aggregate portion composed of cement and aggregate is 75 to 90 parts by weight when the total composition is 100 parts by weight, and the floor foundation concrete. It relates to the construction method.
従来、セメント及び骨材から成る骨材部が組成物全体１００重量部中の７１重量部程度である組成物を実施例として示し、硬化後の塗膜に剥離や反りが生じないポリマーセメント組成物として、水硬性セメント、水、ポリオール（ａ）、イソシアネート化合物、及び骨材を必須成分とするポリマーセメント組成物であって、イソシアネート化合物が、ひまし油系ポリオール、ポリブタジエン系ポリオール、及び水添ポリブタジエン系ポリオールから選ばれる疎水性のポリオール（ｂ）とジイソシアネート化合物を反応させて得られるイソシアネート基末端プレポリマーを含有することを特徴とする、ポリマーセメント組成物が提案されている（特許文献１）。 Conventionally, a composition in which an aggregate part composed of cement and aggregate is about 71 parts by weight of 100 parts by weight of the whole composition is shown as an example, and a polymer cement composition in which peeling or warping does not occur in a cured coating film As a polymer cement composition containing, as essential components, hydraulic cement, water, polyol (a), isocyanate compound, and aggregate, the isocyanate compound is castor oil-based polyol, polybutadiene-based polyol, and hydrogenated polybutadiene-based polyol. There has been proposed a polymer cement composition characterized by containing an isocyanate group-terminated prepolymer obtained by reacting a hydrophobic polyol (b) selected from: and a diisocyanate compound (Patent Document 1).
これに対して、セメント及び骨材の含有量が、組成物全体１００重量物に対して８３重量部程度のモルタル状の樹脂セメント組成物を実施例として示した耐熱性、耐熱水性及び耐衝撃性を有する樹脂セメント組成物が提案されている（特許文献２）。該樹脂セメント組成物は、分子量が１０００〜３０００で両末端に水酸基を持ち、側鎖を持つポリエステルポリオールとポリフェニルポリメチルポリイソシアネート並びに水硬性セメントを含む骨材とが配合されていることを特徴とする樹脂セメント組成物である。 On the other hand, the heat resistance, hot water resistance and impact resistance of the mortar-shaped resin cement composition having a cement and aggregate content of about 83 parts by weight with respect to 100 weight parts of the whole composition are shown as examples. There has been proposed a resin cement composition having a composition (Patent Document 2). The resin cement composition is characterized in that a polyester polyol having a molecular weight of 1000 to 3000, hydroxyl groups at both ends, side chains, and an aggregate containing polyphenylpolymethylpolyisocyanate and hydraulic cement are blended. The resin cement composition.
しかしながら、特許文献１に示されるポリマーセメント組成物は混合粘度が５０００〜６０００ｃＰ／２０℃であって（特許文献１の実施例参照）、その性状はペースト状であり下地への塗布厚みは５ｍｍ程度である。このためセメント及び骨材から成る骨材部が組成物全体１００重量部中の７５〜９０重量部であるようなモルタル状の水硬性ポリマーセメント組成物と比較して、重量物の落下に対する耐衝撃性や、９５℃熱水と２０℃冷水の繰り返し流下に対する耐熱衝撃性が十分ではないという課題がある。 However, the polymer cement composition shown in Patent Document 1 has a mixed viscosity of 5000 to 6000 cP / 20 ° C. (see the Examples of Patent Document 1), and its properties are pasty, and the coating thickness on the base is about 5 mm. It is. Therefore, compared to a mortar-like hydraulic polymer cement composition in which the aggregate part composed of cement and aggregate is 75 to 90 parts by weight in 100 parts by weight of the whole composition, the impact resistance against dropping of heavy objects is reduced. And thermal shock resistance against repeated flow of 95 ° C. hot water and 20 ° C. cold water are not sufficient.
また、特許文献２に示される樹脂セメント組成物は耐熱水性や耐衝撃性は従来のままに維持しながら十分な可使時間を得るものである。該樹脂セメント組成物は、９５℃熱水と２０℃冷水が繰り返し流下すると、樹脂の硬化反応が徐々にではあるが遂には十分に進むことになって骨材と骨材を結合している樹脂や塗膜表面の樹脂が硬化収縮する。しかし下地コンクリート表面に付着している塗膜は全体として動きが拘束されているため塗膜に大きな収縮応力が発生する。このため該収縮応力が塗膜の端部を下地コンクリートから剥離させることがあり、また下地コンクリートの表層強度が不十分なときには該表層を破壊して塗膜裏面にコンクリートが付着した状態で塗膜の浮きが生じるという課題がある。また逆に骨材と樹脂との付着が不十分な場合は骨材と樹脂との間に付着破壊が生じ、結果として塗膜表面にひび割れが発生するという課題がある。 Further, the resin cement composition disclosed in Patent Document 2 obtains sufficient pot life while maintaining hot water resistance and impact resistance as before. In the resin cement composition, when hot water of 95 ° C. and cold water of 20 ° C. repeatedly flow, the resin curing reaction gradually proceeds but finally proceeds sufficiently, so that the aggregate and the aggregate are bonded to each other. And the resin on the surface of the coating film cures and shrinks. However, since the movement of the coating film adhering to the base concrete surface is restricted as a whole, a large shrinkage stress is generated in the coating film. For this reason, the shrinkage stress may cause the edge of the coating to peel off from the underlying concrete, and when the surface strength of the underlying concrete is insufficient, the surface is destroyed and the coating adheres to the back of the coating. There is a problem that the floating of is generated. On the other hand, when the adhesion between the aggregate and the resin is insufficient, there is a problem in that adhesion failure occurs between the aggregate and the resin, and as a result, cracks occur on the surface of the coating film.
本発明が解決しようとする課題は、塗膜全体として十分な強度があるため重量物に対する耐衝撃性を有すると共に、塗膜に発生する収縮応力が従来と比して極めて低く、このため従来のように塗膜の端部が下地コンクリートから剥離することが無く、また下地コンクリートの表層強度が不十分なときであっても塗膜の浮きが生じることが無く、さらには塗膜表面にひび割れが発生することがない水系ポリウレタン組成物を提供することにある。 The problem to be solved by the present invention is that the entire coating film has sufficient strength, so that it has impact resistance to heavy objects, and the shrinkage stress generated in the coating film is extremely low as compared with the conventional film. In this way, the edge of the coating does not peel off from the foundation concrete, and even when the surface strength of the foundation concrete is insufficient, the coating does not float, and further, the coating surface is cracked. An object of the present invention is to provide an aqueous polyurethane composition that does not occur.
また、同様に塗膜に発生する収縮応力が従来と比して極めて低いため、従来、収縮応力が高い際に下地コンクリート表面に適宜の間隔で凹状の目地部を設けることにより塗膜の裏面の一部を該目地部に噛み合った状態として塗膜端部や塗膜裏面を下地コンクリートに機械的に付着させて剥離等を未然に防止するというような、施工上の余分な工程や工夫を必要としない、施工が容易な水系ポリウレタン組成物及び該水系ポリウレタン組成物の床下地コンクリートへの施工方法を提供することにある。 Similarly, since the shrinkage stress generated in the coating film is extremely low compared to the conventional case, conventionally, when the shrinkage stress is high, by providing concave joints at appropriate intervals on the surface of the underlying concrete, Necessary extra steps and ingenuity in construction, such as partly meshing with the joints and mechanically adhering the coating edge and back to the underlying concrete to prevent peeling, etc. An object of the present invention is to provide a water-based polyurethane composition that is easy to construct, and a method for constructing the water-based polyurethane composition on floor foundation concrete.
請求項１記載の発明は、ポリオール、ポリイソシアネート、希釈剤、セメント、骨材及び水を含有してなるモルタル状の水硬性ポリマーセメント組成物であって、ポリオールはヒマシ油変性３官能ポリオールとビスフェノールＡ骨格を有する４官能ポリオールとビスフェノールＡ骨格を有する２官能ポリエーテルポリオールから成り、希釈剤はアジピン酸エステルを含み、ヒマシ油変性３官能ポリオール及びビスフェノールＡ骨格を有する４官能ポリオールは水酸基当量が２５０〜４５０であり、ビスフェノールＡ骨格を有する２官能ポリエーテルポリオールは水酸基当量が３００〜５００であり、組成物全体を１００重量部とするとセメント及び骨材から成る骨材部は７５〜９０重量部であり、希釈剤は、ポリオールとポリイソシアネートと希釈剤と水から成る樹脂部１００重量部中の１５〜２５重量部であることを特徴とする水系ポリウレタン組成物を提供する。 The invention according to claim 1 is a mortar-shaped hydraulic polymer cement composition comprising a polyol, a polyisocyanate, a diluent, cement, an aggregate and water, wherein the polyol is castor oil-modified trifunctional polyol and bisphenol. It consists of a tetrafunctional polyol having an A skeleton and a bifunctional polyether polyol having a bisphenol A skeleton, the diluent contains an adipate, and the castor oil-modified trifunctional polyol and the tetrafunctional polyol having a bisphenol A skeleton have a hydroxyl equivalent weight of 250. The bifunctional polyether polyol having a bisphenol A skeleton has a hydroxyl group equivalent of 300 to 500, and when the total composition is 100 parts by weight, the aggregate part composed of cement and aggregate is 75 to 90 parts by weight. Yes, diluents are polyol and polyisocyanate Providing an aqueous polyurethane composition comprising 15 to 25 parts by weight of the resin portion in 100 parts by weight consisting of diluent and water.
請求項２記載の発明は、硬化物のＪＩＳ Ｋ ６９１１の圧縮強度は２０Ｎ／ｍｍ２以上であり、収縮応力は１.５Ｎ／ｍｍ２未満であることを特徴とする請求項１記載の水系ポリウレタン組成物を提供する。 According to a second aspect of the invention, the compressive strength of JIS K 6911 of the cured product is at 20 N / mm 2 or more, water-based polyurethane of claim 1, wherein the shrinkage stress and less than 1.5 N / mm 2 A composition is provided.
請求項３記載の発明は、床下地コンクリート表面を、連続した凹状の溝部を設けることなく平面に形成し、該床下地コンクリート表面上に請求項１又は請求項２記載の水系ポリウレタン組成物を厚さ４〜９ｍｍに塗付することを特徴とする水系ポリウレタン組成物の床下地コンクリートへの施工方法を提供する。 In the invention according to claim 3, the floor base concrete surface is formed in a flat surface without providing continuous concave grooves, and the water-based polyurethane composition according to claim 1 or claim 2 is thickened on the floor base concrete surface. The present invention provides a method for applying a water-based polyurethane composition to floor foundation concrete, which is applied to a thickness of 4 to 9 mm.
本発明の水系ポリウレタン組成物及びこの床下地コンクリートへの施工方法は、塗膜全体として十分な強度があるため重量物に対する耐衝撃性を有すると共に、塗膜に発生する収縮応力が従来と比して極めて低く、このため従来のように塗膜の端部が下地コンクリートから剥離することが無く、また下地コンクリートの表層強度が低いときであっても塗膜の浮きが生じることが無く、さらには塗膜表面にひび割れが発生することがない、という効果がある。 The water-based polyurethane composition of the present invention and the construction method for this floor-underlying concrete have sufficient strength as a whole coating film, and thus have impact resistance against heavy objects, and the shrinkage stress generated in the coating film is lower than that of the conventional one. For this reason, the edge of the paint film does not peel off from the base concrete as in the prior art, and the paint film does not float even when the surface layer strength of the base concrete is low. There is an effect that the surface of the coating film does not crack.
また、塗膜に発生する収縮応力が従来と比して極めて低いため、下地コンクリート表面に適宜の間隔で連続した凹状の溝部を設けて、いわゆるファスナー効果によって塗膜端部や塗膜裏面を一定間隔で下地コンクリートに機械的に付着させる必要がない、という効果がある。 In addition, since the shrinkage stress generated in the coating film is extremely low compared to the conventional case, a concave groove that is continuous at an appropriate interval is provided on the surface of the underlying concrete, and the coating film end and coating film back surface are fixed by the so-called fastener effect. There is an effect that there is no need to mechanically adhere to the ground concrete at intervals.
以下本発明について詳細に説明する。 The present invention will be described in detail below.
本発明の水系ポリウレタン組成物は、ポリオール、ポリイソシアネート、希釈剤、セメント、骨材及び水を含有してなるモルタル状の水硬性ポリマーセメント組成物であって、ポリオールはヒマシ油変性３官能ポリオールとビスフェノールＡ骨格を有する４官能ポリオールとビスフェノールＡ骨格を有する２官能ポリエーテルポリオールから成り、希釈剤はアジピン酸エステルを含み、ヒマシ油変性３官能ポリオール及びビスフェノールＡ骨格を有する４官能ポリオールは水酸基当量が２５０〜４５０であり、ビスフェノールＡ骨格を有する２官能ポリエーテルポリオールは水酸基当量が３００〜５００であり、組成物全体を１００重量部とするとセメント及び骨材から成る骨材部は７５〜９０重量部であり、希釈剤は、ポリオールとポリイソシアネートと希釈剤と水から成る樹脂部１００重量部中の１５〜２５重量部であることを特徴とする水系ポリウレタン組成物であり、必要に応じてこれらの他に、顔料や分散剤、消泡剤等の添加剤が配合される。 The water-based polyurethane composition of the present invention is a mortar-like hydraulic polymer cement composition containing a polyol, a polyisocyanate, a diluent, a cement, an aggregate and water, and the polyol is a castor oil-modified trifunctional polyol and It consists of a tetrafunctional polyol having a bisphenol A skeleton and a bifunctional polyether polyol having a bisphenol A skeleton, the diluent contains an adipate, and the castor oil-modified trifunctional polyol and the tetrafunctional polyol having a bisphenol A skeleton have a hydroxyl equivalent. The bifunctional polyether polyol having a bisphenol A skeleton of 250 to 450 has a hydroxyl group equivalent of 300 to 500, and when the total composition is 100 parts by weight, the aggregate part composed of cement and aggregate is 75 to 90 parts by weight. The diluent is polyol and poly It is an aqueous polyurethane composition characterized by being 15 to 25 parts by weight in 100 parts by weight of a resin part comprising a cyanate, a diluent and water, and in addition to these, a pigment, a dispersant, an antifoaming agent Additives such as agents are blended.
本発明の水系ポリウレタン組成物に使用されるポリオールは、ヒマシ油変性３官能ポリオールとビスフェノールＡ骨格を有する４官能ポリオールとビスフェノールＡ骨格を有する２官能ポリエーテルポリオールから成る。 The polyol used in the aqueous polyurethane composition of the present invention comprises a castor oil-modified trifunctional polyol, a tetrafunctional polyol having a bisphenol A skeleton, and a bifunctional polyether polyol having a bisphenol A skeleton.
ヒマシ油変性３官能ポリオールは、ヒマシ油及びその誘導体で、例えばヒマシ油脂肪酸のジグリセライド、モノグリセライド及びそれらの混合物であり、水酸基数が３のポリオールである。本発明に使用するヒマシ油変性３官能ポリオールの水酸基当量は、２５０〜４５０が好ましく、２５０未満では硬化物の収縮応力が大きくなって塗膜が下地コンクリートから剥離したり、硬化が速くなって作業性が不良となり、４５０超では水系ポリウレタン組成物として硬化後の強度が不十分となる。 The castor oil-modified trifunctional polyol is castor oil and derivatives thereof, for example, diglyceride, monoglyceride of castor oil fatty acid, and a mixture thereof, and is a polyol having 3 hydroxyl groups. The hydroxyl equivalent of the castor oil-modified trifunctional polyol used in the present invention is preferably 250 to 450, and if it is less than 250, the shrinkage stress of the cured product becomes large and the coating film peels off from the underlying concrete, or the work is accelerated and cured. When it exceeds 450, the strength after curing as an aqueous polyurethane composition becomes insufficient.
ビスフェノールＡ骨格を有する４官能ポリオールは、ビスフェノールＡ骨格を有するポリエポキシ化合物に活性水素化合物を反応させて得られるエポキシ開環ポリオールであり、水酸基当量は２５０〜４５０が好ましい。水酸基当量が２５０未満では硬化物の収縮応力が大きくなって塗膜が下地コンクリートから剥離したり、硬化が速くなって作業性が不良となり、４５０超では水系ポリウレタン組成物として硬化後の強度が不十分となる。 The tetrafunctional polyol having a bisphenol A skeleton is an epoxy ring-opening polyol obtained by reacting an active hydrogen compound with a polyepoxy compound having a bisphenol A skeleton, and the hydroxyl equivalent is preferably 250 to 450. When the hydroxyl equivalent is less than 250, the shrinkage stress of the cured product increases and the coating film peels off from the underlying concrete, or the curing becomes faster and the workability becomes poor. When it exceeds 450, the strength after curing as an aqueous polyurethane composition is poor. It will be enough.
ビスフェノールＡ骨格を有する２官能ポリエーテルオールは、ビスフェノールＡにエチレンオキシド、プロピレンオキシド等のアルキレンオキシドを１種または２種類以上付加反応させることにより得られるポリエーテルポリオールであり、水酸基当量は３００〜５００が好ましい。水酸基当量が３００未満では硬化物の収縮応力が大きくなって塗膜が下地コンクリートから剥離したり、硬化が速くなって作業性が不良となり、５００超では水系ポリウレタン組成物として硬化後の強度が不十分となる。 The bifunctional polyetherol having a bisphenol A skeleton is a polyether polyol obtained by subjecting bisphenol A to an addition reaction of one or more alkylene oxides such as ethylene oxide and propylene oxide, and has a hydroxyl group equivalent of 300 to 500. preferable. If the hydroxyl equivalent is less than 300, the shrinkage stress of the cured product increases and the coating film peels off from the underlying concrete, or the curing becomes faster and the workability becomes poor, and if it exceeds 500, the strength after curing as an aqueous polyurethane composition is poor. It will be enough.
本発明の水系ポリウレタン組成物は上記ポリオールに加えて希釈剤を含有し、該希釈剤はアジピン酸エステルを含む。アジピン酸エステルとしてはアジピン酸ジイソノニルが好ましく、上記ポリオールと希釈剤と水を混合して１液とし、主剤として形成することが好ましい。希釈剤にはアジピン酸エステルの他、スルホン酸エステル化合物を配合することが出来る。また該主剤には塗膜を着色するためのトナーを配合することが出来る。 The aqueous polyurethane composition of the present invention contains a diluent in addition to the polyol, and the diluent contains an adipic acid ester. The adipic acid ester is preferably diisononyl adipate, and the polyol, diluent, and water are mixed to form one liquid, which is preferably formed as the main agent. In addition to adipic acid ester, a sulfonic acid ester compound can be added to the diluent. The main agent can be blended with a toner for coloring the coating film.
希釈剤は、ポリオールとポリイソシアネートと希釈剤と水から成る樹脂部１００重量部中１５〜２５重量部であり、１５重量部未満では硬化物の収縮応力が高くなり、２５重量部超では硬化物の強度が低下する。希釈剤中のアジピン酸エステルの含有割合は４０％以上１００％以下が好ましい。４０％未満では硬化物の収縮応力が高くなる。 The diluent is 15 to 25 parts by weight in 100 parts by weight of the resin part composed of polyol, polyisocyanate, diluent and water, and if it is less than 15 parts by weight, the shrinkage stress of the cured product becomes high, and if it exceeds 25 parts by weight, the cured product is obtained. The strength of is reduced. The content ratio of the adipic acid ester in the diluent is preferably 40% or more and 100% or less. If it is less than 40%, the shrinkage stress of the cured product becomes high.
本発明の水系ポリウレタン組成物に使用するポリイソシアネートは、作業性が良好となり、また低温での速硬化性さらには硬化後の強度が高いことより、４，４´−ジフェニルメタンジイソシアネートを使用することが好ましいが、他の脂肪族ポリイソシアネートや芳香族ポリイソシアネートや脂環式ポリイソシアネート等も使用することもでき、また併用することも可能である。 The polyisocyanate used in the water-based polyurethane composition of the present invention has good workability, fast curability at low temperature, and high strength after curing. Therefore, 4,4′-diphenylmethane diisocyanate may be used. Although it is preferable, other aliphatic polyisocyanates, aromatic polyisocyanates, alicyclic polyisocyanates, and the like can also be used, and can be used in combination.
ポリオール及びアルコール化合物の水酸基一個に対するイソシアネート基の数は、５．５〜６．５が好ましく、５．５未満では硬化が遅延し、６．５超では硬化物に炭酸ガスによる発泡が生じる場合がある。 The number of isocyanate groups relative to one hydroxyl group of the polyol and alcohol compound is preferably 5.5 to 6.5, and if it is less than 5.5, curing is delayed, and if it exceeds 6.5, foaming due to carbon dioxide gas may occur in the cured product. is there.
本発明の水系ポリウレタン組成物に使用するセメントは、本発明の水系ポリウレタン組成物が床下地コンクリートに塗布し美観を付与することを目的としているため、特定の色調の付与できるように、主として白色ポルトランドセメントを使用することが好ましい。他に普通ポルトランドセメント、アルミナセメント、高炉セメント、早強ポルトランドセメントを併用することができる。セメントの配合量は組成物全体１００重量部中の５〜１０重量部である。 The cement used in the water-based polyurethane composition of the present invention is mainly intended to impart a specific color tone to the white Portland cement since the water-based polyurethane composition of the present invention is applied to floor foundation concrete and imparts a beautiful appearance. It is preferable to use an agent. In addition, ordinary Portland cement, alumina cement, blast furnace cement, and early-strength Portland cement can be used in combination. The blending amount of cement is 5 to 10 parts by weight in 100 parts by weight of the whole composition.
本発明の水系ポリウレタン組成物に使用する骨材には、粒子径が１．０〜３．０ｍｍのガイシ粉末と、粒子径が０．６〜２．３６ｍｍの硅砂と、粒子径が０．２１〜１．１８ｍｍの硅砂と、粒子径が０．１５〜０．８５ｍｍの硅砂を併用して使用する。ガイシ粉末は、ガイシの生産工場において破損若しくは廃棄されたガイシを粉砕処理したもので、陶磁器の持つ強度、耐摩耗性、耐熱性などを床に付与する効果がある。粒子径が１．０ｍｍ未満では床下地コンクリートへの塗布作業性が悪くなり、３．０ｍｍ超では組成物中への分散性及び硬化後の塗膜表面の凹凸が大きくなりすぎる。 The aggregate used in the water-based polyurethane composition of the present invention includes an insulator powder having a particle size of 1.0 to 3.0 mm, cinnabar sand having a particle size of 0.6 to 2.36 mm, and a particle size of 0.21.硅 1.18 mm of cinnabar and particle size of 0.15 to 0.85 mm of cinnabar are used in combination. The insulator powder is obtained by pulverizing an insulator that has been damaged or discarded at an insulator factory, and has the effect of imparting the strength, wear resistance, heat resistance, etc. of ceramics to the floor. When the particle diameter is less than 1.0 mm, the workability of application to the floor foundation concrete is deteriorated, and when it exceeds 3.0 mm, the dispersibility in the composition and the unevenness of the coating surface after curing are too large.
粒子径が０．６〜２．３６ｍｍの硅砂は３号硅砂が、粒子径が０．２１〜１．１８ｍｍの硅砂は硅砂４号が、粒子径が０．１５〜０．８５ｍｍの硅砂は５号硅砂がそれぞれ該当する。粒子径が１．０〜３．０ｍｍのガイシ粉末と粒子径が０．６〜２．３６ｍｍの硅砂と、粒子径が０．２１〜１．１８ｍｍの硅砂と、粒子径が０．１５〜０．８５ｍｍの硅砂の併用比率は、重量で０．９〜１．１：０．９〜１．１：１．８〜２．２：１．８〜２．２が床下地コンクリートへの塗布作業性と強度発現及び耐衝撃性の観点から好ましい。セメント及びガイシ粉末及びこれらの硅砂の合計部数が組成物全体に対する割合は、組成物全体１００重量部中７５〜９０重量部である。７５重量部未満では硬化物表面に樹脂が浮いて防滑性が低下し、９０重量部超では塗布作業性が不良となる。 The cinnabar with particle diameter of 0.6-2.36 mm is No.3 cinnabar, the cinnabar with particle diameter of 0.21-1.18 mm is cinnabar No.4, and the cinnabar with particle diameter of 0.15-0.85 mm is 5 No. Insulating powder with a particle size of 1.0 to 3.0 mm, cinnabar with a particle size of 0.6 to 2.36 mm, cinnabar with a particle size of 0.21 to 1.18 mm, and a particle size of 0.15 to 0 Application ratio to floor foundation concrete is 0.9-1.1: 0.9-1.1: 1.8-2.2: 1.8-2.2 by weight. From the viewpoint of property, strength expression and impact resistance. The ratio of the total parts of cement and galvanized powder and these cinnabar to the whole composition is 75 to 90 parts by weight in 100 parts by weight of the whole composition. If it is less than 75 parts by weight, the resin floats on the surface of the cured product and the slip resistance is lowered, and if it exceeds 90 parts by weight, the coating workability becomes poor.
本発明の水系ポリウレタン組成物には、上記のほかに消石灰を配合することが好ましい。該消石灰は、ポリイソシアネートと水とのウレア反応で発生する炭酸ガスを吸収し、組成物が床下地コンクリート上に塗布され硬化するまでに発生する炭酸ガスが特定部分に集中して塗膜を押上げて膨れを生じさせることを抑制する効果がある。 In addition to the above, slaked lime is preferably added to the aqueous polyurethane composition of the present invention. The slaked lime absorbs carbon dioxide gas generated by the urea reaction between polyisocyanate and water, and the carbon dioxide gas generated until the composition is applied on the floor foundation concrete and hardens to concentrate on a specific part to press the coating film. This has the effect of suppressing the occurrence of swelling.
本発明の水系ポリウレタン組成物は、ＪＩＳ Ｋ ６９１１ の圧縮強度が２０Ｎ／ｍｍ２以上であり、収縮応力は１.５Ｎ／ｍｍ２未満である。圧縮強度が２０Ｎ／ｍｍ２未満では、重量物が硬化塗膜上に落下した際の耐衝撃性が不十分となる。 Aqueous polyurethane composition of the present invention, the compressive strength of JIS K 6911 is not less 20 N / mm 2 or more, shrinkage stress is less than 1.5 N / mm 2. When the compressive strength is less than 20 N / mm 2 , the impact resistance when a heavy material falls on the cured coating film becomes insufficient.
収縮応力は、下記の評価方法で示した方法によって算出し、該収縮応力が１.５Ｎ／ｍｍ２以上では塗膜が下地コンクリートより剥離する場合がある。 The shrinkage stress is calculated by the method shown in the following evaluation method. When the shrinkage stress is 1.5 N / mm 2 or more, the coating film may be peeled off from the ground concrete.
本発明の水系ポリウレタン組成物を床下地コンクリート上に塗布する際には、まず床下地コンクリート表面にあるレイタンス等の脆弱層をポリッシング等により除去する。次に、床下地コンクリート表面を連続した凹状の溝部を設けることなく平面に形成する。これは床下地コンクリートの一の辺が１０ｍ超の長さであっても同様である。次に、直接本発明のモルタル状の水系ポリウレタン組成物を塗付するが、必要に応じてプライマーを塗付し乾燥させた後、本発明のモルタル状の水系ポリウレタン組成物を塗付してもよい。本発明の水系ポリウレタン組成物は、まず木鏝等で床全体に配り、その後金鏝等で十分に押さえながら塗膜の厚さが４〜９ｍｍとなるように塗付する。 When the water-based polyurethane composition of the present invention is applied on the floor foundation concrete, first, a brittle layer such as latency on the surface of the floor foundation concrete is removed by polishing or the like. Next, the floor foundation concrete surface is formed in a flat surface without providing a continuous concave groove. This is the same even if one side of the floor foundation concrete has a length of more than 10 m. Next, the mortar aqueous polyurethane composition of the present invention is directly applied, but after applying a primer and drying as necessary, the mortar aqueous polyurethane composition of the present invention may be applied. Good. The aqueous polyurethane composition of the present invention is first applied to the entire floor with a mallet or the like, and then applied so that the thickness of the coating film becomes 4 to 9 mm while being sufficiently pressed with a hammer or the like.
床下地コンクリート上に塗布する本発明の水系ポリウレタン組成物の厚さは、重量物が落下して塗膜が割れたり剥離したりする耐衝撃性の観点及び床下地コンクリート上への塗布作業性の観点から、上述のように４〜９ｍｍが好ましい。４ｍｍ未満では塗布作業性及び耐衝撃性が不十分と成り、９ｍｍ超では樹脂の収縮力の絶対量が増して塗膜が剥離したり浮きが発生する場合がある。 The thickness of the water-based polyurethane composition of the present invention applied on the floor base concrete is determined from the viewpoint of impact resistance that the heavy material falls and the coating film cracks or peels off, and the coating workability on the floor base concrete. From the viewpoint, 4 to 9 mm is preferable as described above. If it is less than 4 mm, the coating workability and impact resistance become insufficient, and if it exceeds 9 mm, the absolute amount of the shrinkage force of the resin increases, and the coating film may peel off or float.
以下，実施例及び比較例にて具体的に説明する。 Hereinafter, it demonstrates concretely in an Example and a comparative example.
実施例
水酸基当量が３５０のヒマシ油変性３官能ポリオールを１０〜１５重量部と、水酸基当量が３６０のビスフェノールＡ骨格を有する４官能ポリオールを５〜１０重量部と、水酸基当量が３００〜５００のビスフェノールＡ骨格を有する２官能ポリエーテルポリオールを２３〜２８重量部と、希釈剤としてスルホン酸エステル化合物（メザモール；商品名、バイエル社製）を２０〜２５重量部と、水（イオン交換水）３０重量部を含み全体として１００重量部となる、ポリオールと希釈剤と水の混合物３５０重量部に、さらにアジピン酸ジイソノニルを１００重量部配合し、さらに着色トナー５０重量部を混合して実施例の水系ポリウレタン組成物の主剤とした。なお、該主剤の市販品としてＪＪ−５００Ｔ−Ｃｏａｔ Ｆｌｅｘ Ａ（商品名、アイカ工業株式会社製）がある。またポリイソシアネートとして、クルードＭＤＩ（４，４´−ジフェニルメタンジイソシアネート） ルプラネートＭＢ−５Ｓ（商品名、ＢＡＳＦ ＩＮＯＡＣポリウレタン株式会社製、ＮＣＯ重量％：３１．４〜３２．６％）４００重量部を実施例の水系ポリウレタン組成物の硬化剤とした。また骨材には、ガイシ粉末として粒子径１．０〜３．０ｍｍのセルベン（商品名、株式会社オクムラセラム製）７２０重量部と、粒子径０．６〜２．３６ｍｍの硅砂：乾燥硅砂３号（商品名、篠沢硅砂工業株式会社製）７２０重量部と、粒子径０．２１〜１．１８ｍｍの硅砂：東北硅砂４号（商品名、東北硅砂株式会社製）１４１６重量部と、粒子径０．１５〜０．８５ｍｍの硅砂：東北硅砂５号（商品名、東北硅砂株式会社製）１４１６重量部を使用し、セメントとして白色ポルトランドセメント（太平洋セメント社製）を４３２重量部を使用して実施例の水系ポリウレタン組成物の骨材及びセメントとした。
Example 10-15 parts by weight of castor oil-modified trifunctional polyol having a hydroxyl group equivalent of 350, 5-10 parts by weight of a tetrafunctional polyol having a bisphenol A skeleton having a hydroxyl group equivalent of 360, and a bisphenol having a hydroxyl equivalent of 300-500 23 to 28 parts by weight of a bifunctional polyether polyol having an A skeleton, 20 to 25 parts by weight of a sulfonic acid ester compound (Mezamol; trade name, manufactured by Bayer) as a diluent, and 30 parts by weight of water (ion-exchanged water) 100 parts by weight of a mixture of polyol, diluent and water, 100 parts by weight of diisononyl adipate and 50 parts by weight of colored toner are further mixed with the water-based polyurethane of the example. The main component of the composition was used. In addition, there exists JJ-500T-Coat Flex A (brand name, Aika Kogyo Co., Ltd. product) as a commercial item of this main ingredient. In addition, 400 parts by weight of Crude MDI (4,4′-diphenylmethane diisocyanate) Lupranate MB-5S (trade name, manufactured by BASF INOAC Polyurethane Co., Ltd., NCO weight%: 31.4 to 32.6%) is used as the polyisocyanate. A curing agent for the aqueous polyurethane composition was used. In addition, the aggregate includes 720 parts by weight of selben (trade name, manufactured by Okumura Serum Co., Ltd.) having a particle diameter of 1.0 to 3.0 mm as an insulating powder and cinnabar sand having a particle diameter of 0.6 to 2.36 mm: dried cinnabar 3 No. (trade name, manufactured by Shinozawa Kosuna Industry Co., Ltd.) 720 parts by weight, and silica sand having a particle size of 0.21-1.18 mm: Tohoku Kosuna No. 4 (trade name, manufactured by Tohoku Kosuna Co., Ltd.) 0.15-0.85 mm cinnabar: Tohoku cinnabar No. 5 (trade name, manufactured by Tohoku cinnabar Co., Ltd.) 1416 parts by weight, white Portland cement (manufactured by Taiheiyo Cement Co.) as 432 parts by weight Aggregates and cements of the aqueous polyurethane compositions of the examples were used.
骨材とセメントは、上記ガイシ粉末と３種類の硅砂と白色ポルトランドセメントを予め均一に混合し、さらにこれらの他に消石灰９６重量部を加えて実施例の水系ポリウレタン組成物の骨材部とした。床下地コンクリートへの塗布及び下記評価項目の評価に当たっては上記実施例の主剤５００重量部と実施例の硬化剤４００重量部と実施例の骨材部４８００重量部を混合し実施例の水系ポリウレタン組成物とした。 Aggregate and cement were mixed in advance with the above-mentioned insulator powder, three types of cinnabar sand and white Portland cement, and 96 parts by weight of slaked lime was added to these to obtain an aggregate part of the aqueous polyurethane composition of the example. . In the application to floor concrete and the evaluation of the following evaluation items, 500 parts by weight of the main agent of the above example, 400 parts by weight of the curing agent of the example, and 4800 parts by weight of the aggregate part of the example are mixed, and the aqueous polyurethane composition of the example is mixed. It was a thing.
比較例１
水酸基当量が３５０のヒマシ油変性３官能ポリオールを３５〜４０重量部と、水酸基当量が３６０のビスフェノールＡ骨格を有する４官能ポリオールを３〜８重量部と、希釈剤としてスルホン酸エステル化合物（メザモール；商品名、バイエル社製）を２０〜２５重量部と、水（イオン交換水）３０重量部とを含み全体として１００重量部となる、ポリオールと水の混合物２７０重量部に着色トナー３０重量部を混合して比較例１の水系ポリウレタン組成物の主剤とした。またポリイソシアネートとしてクルードＭＤＩ（４，４´−ジフェニルメタンジイソシアネート）ルプラネートＭＢ−５Ｓ（商品名、ＢＡＳＦ ＩＮＯＡＣポリウレタン株式会社製、ＮＣＯ重量％：３１．４〜３２．６％）３００重量部を比較例１の水系ポリウレタン組成物の硬化剤とした。
Comparative Example 1
35 to 40 parts by weight of a castor oil-modified trifunctional polyol having a hydroxyl group equivalent of 350, 3 to 8 parts by weight of a tetrafunctional polyol having a bisphenol A skeleton having a hydroxyl group equivalent of 360, and a sulfonic acid ester compound (mesamol; 30 parts by weight of color toner is added to 270 parts by weight of a mixture of polyol and water, including 20 to 25 parts by weight of a trade name (manufactured by Bayer) and 30 parts by weight of water (ion exchange water). It mixed and it was set as the main ingredient of the water-based polyurethane composition of the comparative example 1. Further, 300 parts by weight of Crude MDI (4,4′-diphenylmethane diisocyanate) Rupranate MB-5S (trade name, manufactured by BASF INOAC Polyurethane Co., Ltd., NCO weight%: 31.4 to 32.6%) as a polyisocyanate is Comparative Example 1. A curing agent for the aqueous polyurethane composition was used.
比較例１の骨材とセメントは、実施例の骨材及びセメントと同一とし、比較例１の骨材部も実施例の骨材部と同一とした。床下地コンクリートへの塗布及び下記評価項目の評価に当たっては比較例１の主剤３００重量部と比較例１の硬化剤３００重量部と比較例１の骨材部３０００重量部を混合し比較例１の水系ポリウレタン組成物とした。 The aggregate and cement of Comparative Example 1 were the same as the aggregate and cement of Example, and the aggregate part of Comparative Example 1 was also the same as the aggregate part of Example. In the application to the floor base concrete and the evaluation of the following evaluation items, 300 parts by weight of the base agent of Comparative Example 1, 300 parts by weight of the curing agent of Comparative Example 1 and 3000 parts by weight of the aggregate part of Comparative Example 1 were mixed. An aqueous polyurethane composition was obtained.
比較例２
水酸基当量が３５０のヒマシ油変性３官能ポリオールを１０〜１５重量部と、水酸基当量が３６０のビスフェノールＡ骨格を有する４官能ポリオールを１０〜１５重量部と、水酸基当量が１８０のビスフェノールＡ骨格を有する２官能ポリエーテルポリオールを５〜１０重量部と、水酸基当量が１５６で１個の水酸基を有するアルコール化合物（メントール）を１〜５重量部と、希釈剤としてスルホン酸エステル化合物（メザモール；商品名、バイエル社製）を２５〜３０重量部と、水（イオン交換水）３０重量部とを含み全体として１００重量部となる、ポリオールと希釈剤と水の混合物２７０重量部に着色トナー３０重量部を混合して比較例２の水系ポリウレタン組成物の主剤とした。またポリイソシアネートとしてクルードＭＤＩ（４，４´−ジフェニルメタンジイソシアネート）ルプラネートＭＢ−５Ｓ（商品名、ＢＡＳＦ ＩＮＯＡＣポリウレタン株式会社製、ＮＣＯ重量％：３１．４〜３２．６％）３００重量部を比較例２の水系ポリウレタン組成物の硬化剤とした。
Comparative Example 2
10-15 parts by weight of castor oil-modified trifunctional polyol having a hydroxyl group equivalent of 350, 10-15 parts by weight of a tetrafunctional polyol having a bisphenol A skeleton having a hydroxyl group equivalent of 360, and a bisphenol A skeleton having a hydroxyl group equivalent of 180 5 to 10 parts by weight of a bifunctional polyether polyol, 1 to 5 parts by weight of an alcohol compound (menthol) having a hydroxyl group equivalent of 156 and one hydroxyl group, and a sulfonic acid ester compound (mesamol; trade name, 30 parts by weight of a colored toner and 270 parts by weight of a mixture of polyol, diluent and water, which are 25 parts by weight to 30 parts by weight and 30 parts by weight of water (ion-exchanged water). It mixed and it was set as the main ingredient of the aqueous polyurethane composition of Comparative Example 2. Further, 300 parts by weight of Crude MDI (4,4′-diphenylmethane diisocyanate) Ruplanate MB-5S (trade name, manufactured by BASF INOAC Polyurethane Co., Ltd., NCO weight%: 31.4 to 32.6%) as a polyisocyanate is Comparative Example 2. A curing agent for the aqueous polyurethane composition was used.
比較例２の骨材とセメントは、実施例の骨材及びセメントと同一とし、比較例の骨材部も実施例のセメント骨材部と同一とした。床下地コンクリートへの塗布及び下記評価項目の評価に当たっては比較例２の主剤３００重量部と比較例２の硬化剤３００重量部と比較例２の骨材部３０００重量部を混合し比較例２の水系ポリウレタン組成物とした。 The aggregate and cement of Comparative Example 2 were the same as the aggregate and cement of Example, and the aggregate part of Comparative Example was also the same as the cement aggregate part of Example. In the application to the floor base concrete and the evaluation of the following evaluation items, 300 parts by weight of the base agent of Comparative Example 2, 300 parts by weight of the curing agent of Comparative Example 2 and 3000 parts by weight of the aggregate part of Comparative Example 2 were mixed. An aqueous polyurethane composition was obtained.
評価項目及び評価方法Evaluation items and evaluation methods
圧縮強度
ＪＩＳ Ｋ ６９１１ ５．１９ 圧縮強さ に準じ、実施例、比較例１及び比較例２の水系ポリウレタン組成物を２５．４×１２．７×１２．７ｍｍの形状にて硬化させ、２３℃７日間養生後に載荷速度1ｍｍ/分で圧縮し、圧縮強度（Ｎ/ｍｍ２）を測定した。
Compressive strength According to JIS K 6911 5.19 Compressive strength, the aqueous polyurethane compositions of Examples, Comparative Examples 1 and 2 were cured in the form of 25.4 × 12.7 × 12.7 mm, and 23 ° C. After curing for 7 days, the sample was compressed at a loading speed of 1 mm / min, and the compression strength (N / mm 2 ) was measured.
耐衝撃性
２３℃下でＪＩＳＡ５３７１の３００ｍｍ×３００ｍｍ×厚さ６０ｍｍの乾燥したコンクリート平板（ケット水分計ＨＩ−５２０コンクリートレンジにて５％以下）の表面に、均一に混合した実施例、比較例１又は比較例２の水系ポリウレタン組成物を厚さ４〜９ｍｍに金ゴテで塗布して７日間養生し、中央部に高さ１ｍから１ｋｇの鋼球を３０回落下させ、塗膜に割れ、剥がれ等の異常のないものを○、割れ、剥がれ等の異常が生じたものを×と評価した。
On the surface of the dried concrete slab of 300 mm × 300 mm × thickness 60mm impact 23 ° C. under JISA5371 (less than 5% by ket moisture meter HI-520 concrete range), performed were uniformly mixed example, Comparative Example 1 Alternatively, the aqueous polyurethane composition of Comparative Example 2 was applied to a thickness of 4 to 9 mm with a gold trowel and cured for 7 days. A steel ball having a height of 1 to 1 kg was dropped 30 times in the center, and the coating film was cracked and peeled off. Those having no abnormality such as ◯ were evaluated, and those having abnormality such as cracking and peeling were evaluated as ×.
耐熱衝撃性
ＪＩＳＡ５３７１の３００ｍｍ×３００ｍｍ×厚さ６０ｍｍの乾燥したコンクリート平板（ケット水分計ＨＩ−５２０コンクリートレンジにて５％以下）を４分の１にカットして１５０ｍｍ×１５０ｍｍ×厚さ６０ｍｍの試験板とし、該の試験板の表面をサンドペーパー＃８０で十分に目荒らしをして脆弱層を除去し、均一に混合した実施例、比較例１又は比較例２の水系ポリウレタン組成物を厚さ４〜９ｍｍに塗布し７日間養生する。その後試験体中央部に９５℃熱水を５分流下させ次に２０℃の冷水を１０分流下させることを１サイクルとして４０００サイクル繰り返し、塗膜に剥がれ、浮き等異常が生じないものを○、異常が生じたものを×と評価した。
Thermal shock resistance JIS A5371 300 mm x 300 mm x 60 mm thick dry concrete flat plate (5% or less in ket moisture meter HI-520 concrete range) cut to 1/4 and test 150 mm x 150 mm x thickness 60 mm The surface of the test plate was sufficiently roughened with sandpaper # 80 to remove the fragile layer, and the water-based polyurethane composition of Example, Comparative Example 1 or Comparative Example 2 was uniformly mixed. Apply to 4-9mm and cure for 7 days. Thereafter, 95 ° C hot water is allowed to flow down to the center of the test body for 5 minutes, and then 20 ° C cold water is allowed to flow down for 10 minutes. The cycle is repeated 4000 cycles. An abnormality was evaluated as x.
付着性
２３℃下でＪＩＳＡ５３７１の３００ｍｍ×３００ｍｍ×厚さ６０ｍｍの乾燥したコンクリート平板（ケット水分計ＨＩ−５２０コンクリートレンジにて５％以下）の表面に、均一に混合した実施例、比較例１又は比較例２の水系ポリウレタン組成物を厚さ４〜９ｍｍに金ゴテで塗布して７日間養生し、建研式接着力試験器により、４０×４０ｍｍ部分の水系ポリウレタン組成物とコンクリート平板との付着強度（Ｎ/ｍｍ２）を測定した。破壊状態は下地コンクリート１００％凝集破壊を○と、それ以外を×と評価した。
Adhesiveness Example 23, Comparative Example 1 or evenly mixed on the surface of a dry concrete flat plate of 300 mm x 300 mm x 60 mm thick (5% or less in a ket moisture meter HI-520 concrete range) of JIS A5371 at 23 ° C The aqueous polyurethane composition of Comparative Example 2 was applied to a thickness of 4 to 9 mm with a gold trowel and cured for 7 days, and the 40 × 40 mm portion of the aqueous polyurethane composition and the concrete flat plate were adhered using a Kenken-type adhesive strength tester. The strength (N / mm 2 ) was measured. As for the fracture state, 100% cohesive fracture of the ground concrete was evaluated as “good”, and the others were evaluated as “poor”.
収縮応力
実施例、比較例１又は比較例２の水系ポリウレタン組成物を、幅１９．０ｍｍ×長さ２２０．０ｍｍ×深さ１０．０ｍｍの型枠に充填して試験片を作製し、２３℃７日間養生する。その後９５℃７日間養生した後、２３℃に徐冷し、試験片の長さ方向の収縮長さ（ΔＬ（ｍｍ））を測定する。その後該試験片を１ｍｍ／分で長さ方向に引張り、引張ヤング率Ｅ（Ｎ／ｍｍ２）を測定する。該引張ヤング率Ｅと型枠の長さＬ（２２０．０ｍｍ）と試験片の収縮長さΔＬから次式により収縮応力（Ｎ／ｍｍ２）を算出した。
収縮応力（Ｎ／ｍｍ２）＝Ｅ×（ΔＬ／Ｌ）
Shrinkage stress The aqueous polyurethane composition of Example, Comparative Example 1 or Comparative Example 2 was filled into a mold having a width of 19.0 mm, a length of 220.0 mm, and a depth of 10.0 mm, and a test piece was prepared. Cured for 7 days. Thereafter, after curing at 95 ° C. for 7 days, the sample is gradually cooled to 23 ° C., and the contraction length (ΔL (mm)) in the length direction of the test piece is measured. Thereafter, the test piece is pulled in the length direction at 1 mm / min, and the tensile Young's modulus E (N / mm 2 ) is measured. The shrinkage stress (N / mm 2 ) was calculated from the tensile Young's modulus E, the length L (220.0 mm) of the mold, and the shrinkage length ΔL of the test piece according to the following equation.
Shrinkage stress (N / mm 2 ) = E × (ΔL / L)
表面仕上がり性
２３℃下において、床下地コンクリート上に均一に混合した実施例、比較例１又は比較例２の水系ポリウレタン組成物を厚さ４〜９ｍｍに金鏝で塗布した際の塗膜の表面状態を目視にて観察し、平滑な仕上がりである場合を○とし、凹凸のある仕上がりとなっている場合を×と評価した。
Surface finish at 23 ° C. The surface of the coating film when the aqueous polyurethane composition of Example, Comparative Example 1 or Comparative Example 2 mixed uniformly on floor foundation concrete was applied to a thickness of 4 to 9 mm with a hammer. The state was visually observed, and a case where the finish was smooth was evaluated as ○, and a case where the finish was uneven was evaluated as ×.
硬化速度
実施例の水系ポリウレタン組成物については、実施例の主剤と実施例の硬化剤とホワイトセメントを６２．５ｇ：５０ｇ：６０ｇにて、比較例１の水系ポリウレタン組成物については比較例１の主剤と比較例１の硬化剤とホワイトセメントを５０ｇ：５０ｇ：５０ｇにて、比較例２の水系ポリウレタン組成物につては比較例２の主剤と比較例２の硬化剤とホワイトセメントを５０ｇ：５０ｇ：５０ｇにて、それぞれ主剤と硬化剤を６０秒混合した後、ホワイトセメントを投入してさらに１２０秒混合する。主剤と硬化剤の混合開始時を０分として、混合開始後の経過時間毎に発熱温度を測定し、最高発熱温度到達時間を硬化速度（分）とした。
Curing Speed Regarding the aqueous polyurethane composition of the example, the main agent of the example, the curing agent of the example and white cement were 62.5 g: 50 g: 60 g, and the aqueous polyurethane composition of Comparative Example 1 was the same as that of Comparative Example 1. The main agent, the curing agent of Comparative Example 1 and the white cement were 50 g: 50 g: 50 g, and the aqueous polyurethane composition of Comparative Example 2 was 50 g: 50 g of the main agent of Comparative Example 2, the curing agent of Comparative Example 2, and the white cement. : After mixing the main agent and the curing agent for 60 seconds at 50 g, respectively, white cement is added and further mixed for 120 seconds. The time of starting mixing of the main agent and the curing agent was set to 0 minutes, the exothermic temperature was measured every time elapsed after the start of mixing, and the time of reaching the highest exothermic temperature was taken as the curing rate (minutes).
評価結果
評価結果を表１に示す。
Evaluation results The evaluation results are shown in Table 1.
Claims (3)
The floor base concrete surface is formed into a flat surface without providing continuous concave grooves, and the water-based polyurethane composition according to claim 1 or 2 is applied to the thickness of 4 to 9 mm on the floor base concrete surface. The construction method to the floor foundation concrete of the water-based polyurethane composition characterized by the above-mentioned.
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