JP2016196399A - Polyurethane-based cement composition, and concrete floor construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyurethane-based cement composition which contains water-dispersible polyol, polyisocyanate, cement and a filler and can be applied in a thickness equal to or larger than 0.2 mm or smaller than 2.5 mm and the hardened coating film of which has high gloss and the coating film of which has high hardness, and to provide a concrete floor construction method of the polyurethane-based cement composition.SOLUTION: The polyurethane-based cement composition of a paste state contains water-dispersible polyol, polyisocyanate, cement and the filler. The water-dispersible polyol comprises caster oil-modified bifunctional polyol, caster oil-modified trifunctional polyol, bis(2-butoxyethyl) phthalate, an emulsifier and water. The water-dispersible polyol has 200-250 hydroxyl equivalent, 85 or higher 60-degree mirror surface gloss degree and 80 or higher type D durometer hardness. The concrete floor construction method of the polyurethane-based cement composition is also provided.SELECTED DRAWING: None

Description

  The present invention comprises a water-dispersed polyol, a polyisocyanate, a cement and a filler, and a paste-like polyurethane cement composition applied to a floor foundation concrete surface to a thickness of 0.2 mm or more and less than 2.5 mm and the same The present invention relates to a concrete floor construction method.

  Conventionally, as a cement composition that easily becomes a uniform mixture and is easy to construct, (a) hydraulic cement, (b) water, (c) cement water reducing agent, and (d) a component that can be cured to become a resin. A cement composition is proposed (Patent Document 1). In addition, as a polyurethane-based cement composition capable of ensuring excellent workability and obtaining a floor surface having an excellent appearance after curing, (a) hydraulic cement, (b) aggregate, (c) isocyanate group A polyurethane-based cement composition comprising, as essential components, a compound comprising: (d) water, (e) a tertiary amine compound catalyst, and (f) an active hydrogen-containing compound (excluding water and a tertiary amine compound catalyst). It has been proposed (Patent Document 2). In addition, by using an isocyanate component containing a specific isocyanate group-terminated prepolymer, a heat-resistant polymer cement composition that does not warp even when cured and contracted without impairing workability, cured coating film appearance, and coating film properties. Hydrophobic polyol selected from polybutadiene-based polyol and hydrogenated polybutadiene-based polyol, which is a polymer cement composition containing hydraulic cement, water, polyol (a), isocyanate compound, and aggregate as essential components A polymer cement composition characterized by containing an isocyanate group-terminated prepolymer obtained by reacting (b) with a diisocyanate compound has been proposed (Patent Document 3).

Moreover, as a polyurethane-based cement composition that retains heat resistance and physical properties and does not impair coating workability and surface appearance, and does not generate warping or cracks on the surface layer even when the coating thickness is 5 mm or less, or shrinks by curing, This composition is composed of a polyol containing at least a water-dispersible polyol, a hydrophobic isocyanate which is polyphenylene polymethyl polyisocyanate, and an aggregate containing hydraulic cement, and is cured on a substrate made of concrete with a coating thickness of 4 mm. The thickness is 4 mm, and curing water at 95 ° C. for 5 minutes and 20 ° C. for 10 minutes is taken as one cycle, and the shrinkage stress after 2000 cycles is 4.0 ± 2.0 N / mm ² and warps after 1300 cycles. A polyurethane-based cement composition has been proposed which is characterized in that no rise or cracks in the surface layer occur. Document 4).

  Further, as a polyurethane cement composition having a glossiness of 5.0 or more and having high stain resistance, that is, high decontamination property, a coating floor material using a polyurethane cement containing hydraulic cement, water, polyol, aggregate, and isocyanate compound. In which the 60 ° specular gloss after curing is 5.0 or more and 90 or less, the polyol is water-dispersible, the isocyanate compound is polymeric MDI, and 2,4′-MDI of this polymeric MDI. A polyurethane-based cement composition having a content of 6% or less and an NCO weight% of 25% or less has been proposed (Patent Document 5, Claim 2).

  Further, as a polyurethane-based cement composition having high gloss, a polyurethane-based cement composition containing hydraulic cement, water, a polyol, and an isocyanate compound, wherein the water ratio of water and polyol to the polyol composition is 40 to 10% by weight. A polyurethane-based cement composition characterized in that an emulsion is formed and urea is contained (Patent Document 6).

JP-A-8-169744 JP 11-79820 A JP 2000-72507 A Japanese Patent No. 4480964 JP 2007-254179 A Japanese Patent No. 5389399

  However, the compositions shown in Patent Document 1 to Patent Document 3 have an aggregate particle size of about 3.0 mm shown in the examples (the particle size of silica sand No. 2 in paragraph 0054 of Patent Document 1). In addition, the obtained composition is supposed to extend to a thickness of 5 mm (Patent Document 2, paragraph 0047), and the coating thickness is preferably 3 to 20 mm, and particularly preferably 4 to 7 mm (Patent Document 3, paragraph 0027). ), At least these compositions have a problem that the coating thickness is 3.0 mm or more.

  Further, the polyurethane cement composition of Patent Document 4 is cured at a thickness of 4 mm (Patent Document 4, Claim 1 and Paragraph 0030), and the polyurethane cement composition of Patent Document 5 is similarly cured at a thickness of 4 mm. (Patent Document 5, paragraph 0028), the glossiness is high and only 81.5 is shown. Further, the NCO wt% of the isocyanate compound used in the composition is 25 wt% or less. There is a problem that the JIS K 7215 Type D durometer hardness of the coating film may be less than 80 (Table 1 in the same paragraph). Similarly, the polyurethane-based cement composition of Patent Document 6 is hardened at a thickness of 4 mm (Patent Document 6, paragraph 0026) and has a problem that its glossiness is high and 56.0.

  The problem to be solved by the present invention is a polyurethane-based cement composition containing a water-dispersed polyol, a polyisocyanate, a cement and a filler, and is applied to 0.2 mm or more and less than 2.5 mm. An object of the present invention is to provide a polyurethane-based cement composition having a specular gloss of a cured coating film of 82 or more and a type D durometer hardness of the coating film surface of 80 or more and a concrete floor construction method thereof.

  The invention according to claim 1 is a paste-like polyurethane cement composition comprising a water-dispersed polyol, a polyisocyanate, a cement and a filler, and is applied to 0.2 mm or more and less than 2.5 mm. The water-dispersed polyol comprises a castor oil-modified bifunctional polyol, a castor oil-modified trifunctional polyol, bis (2-butoxyethyl) phthalate, an emulsifier, and water. The hydroxyl group equivalent of the water-dispersed polyol is 200 to 250. JIS K 5600-4-7 60 degree specular gloss of cured film having a thickness of 5 mm or more and less than 2.5 mm is 85 or more, and JIS K 7215 type D durometer hardness is 80 or more. A polyurethane-based cement composition is provided.

  The invention according to claim 2 provides the polyurethane-based cement composition according to claim 1, wherein the polyisocyanate is polymethyl polyphenyl polyisocyanate.

  The invention according to claim 3 is after the polyurethane cement composition according to claim 1 or 2 is applied as an undercoat to a thickness of 0.2 mm or more and less than 0.6 mm on the floor foundation concrete surface and cured. Furthermore, the present invention provides a concrete floor construction method characterized in that the polyurethane-based cement composition is applied as a top coat to a thickness of 1.5 mm or more and less than 2.5 mm.

  Since the polyurethane cement composition of the present invention is paste-like and has a low viscosity, it has an effect that it can be applied to a thickness of 0.2 mm or more and less than 2.5 mm using a gold hammer or the like on the floor foundation concrete surface. . Moreover, since the JIS K 5600-4-7 60 degree specular gloss of the cured coating film having a thickness of 1.5 mm or more and less than 2.5 mm is 85 or more, and the JIS K 7215 Type D durometer hardness is 80 or more, There is an effect that the surface of the coating film is excellent, and the surface layer of the coating film is smooth and hard with more resin content than other parts. As a result, the floor structure finished with the polyurethane cement composition is There is an effect that the surface of the coating film is hardly soiled and the coating film is not cracked or peeled off even when a heavy object is placed or passes.

  In addition, the concrete floor construction method of the polyurethane cement composition of the present invention is a method in which the polyurethane cement composition of the present invention is first applied as a primer to a thickness of 0.2 mm or more and less than 0.6 mm and cured. Furthermore, in order to finish the polyurethane cement composition by applying the polyurethane cement composition to a thickness of 1.5 mm or more and less than 2.5 mm as a top coat, fine pores (pores resulting from the microstructure of the concrete) are undercoated. In general, when the top coat is applied directly to the floor base concrete surface, the top coat penetrates into the base concrete surface and the surface of the base concrete surface is fine. There is no occurrence of bubbles or pinholes in the top coat due to substitution bubbles that are created by expelling the air in the holes. There are cormorants effect, the coating film surface formed by the polyurethane-based cement compositions of the present invention has the effect that excellent appearance.

  The present invention will be described in detail below.

  The polyurethane cement composition of the present invention comprises a water-dispersed polyol, a polyisocyanate, a cement and a filler, and is a paste-like polyurethane cement that is applied to a thickness of 0.2 mm or more and less than 2.5 mm. The water-dispersed polyol comprises a castor oil-modified bifunctional polyol, a castor oil-modified trifunctional polyol, bis (2-butoxyethyl) phthalate, an emulsifier, and water. JIS K 5600-4-7 60 degree specular gloss of the cured coating film having a thickness of 1.5 mm or more and less than 2.5 mm is 85 or more, and JIS K 7215 type D durometer hardness is 80 or more. It is a polyurethane-based cement composition characterized by the fact that, in addition to these, pigments, dispersants, antifoaming agents, etc. It may be blended additives.

  The water-dispersed polyol used in the polyurethane-based cement composition of the present invention comprises castor oil-modified bifunctional polyol, castor oil-modified trifunctional polyol, bis (2-butoxyethyl) phthalate, an emulsifier, and water. The hydroxyl equivalent of the polyol is 200-250. If the hydroxyl equivalent is less than 200, the cured product may shrink and peel from the base, and if it exceeds 250, the coating film hardness will be insufficient. Castor oil-modified bifunctional polyol or castor oil-modified trifunctional polyol is castor oil and derivatives thereof, for example, diglyceride, monoglyceride of castor oil fatty acid, and mixtures thereof, and is a polyol having 2 or 3 hydroxyl groups.

  The water-dispersed polyol used in the present invention is obtained by emulsifying and dispersing castor oil-modified bifunctional polyol and castor oil-modified trifunctional polyol in water with an emulsifier, and then diluting it with bis (2-butoxyethyl) phthalate. Thus, by setting the hydroxyl equivalent to 200 to 250, and further mixing with polyisocyanate, cement, and filler, the polyurethane-based cement composition according to the present invention that has not yet hardened is obtained. In the present invention, this is further applied to 1.5 mm or more and less than 2.5 mm and cured, and the coating film has a JIS K 5600-4-7 60 ° specular glossiness of 85 or more, and a JIS K 7215 Type D durometer. This is a polyurethane-based cement composition having a hardness of 80 or more. If the 60 ° specular gloss is 85 or more, the coating film surface is glossy. If the Type D durometer hardness is 80 or more, the polyurethane cement composition has durability against the load applied to the coating film.

  As the emulsifier used in the water-dispersed polyol, any of synthetic surfactants, resinate surfactants, and protein surfactants can be used. The types of surfactants are anionic surfactants and cationic surfactants. Surfactants, nonionic surfactants, and amphoteric surfactants can be used alone or in combination.

  The content of bis (2-butoxyethyl) phthalate in the water-dispersed polyol is 30 to 50% by weight, and if it is less than 30% by weight, the workability when applied as a polyurethane-based cement composition to the ground becomes poor and 50% by weight. If it exceeds%, the hardness of the cured coating film is insufficient. In addition, the water content of the water-dispersed polyol is 30 to 40% by weight, and if it is less than 30% by weight, workability when applied to the base as a polyurethane cement composition may be poor. The finish of the cured coating film of the polyurethane-based cement composition may be poor. In addition to these, a colorant can also be added to the water-dispersed polyol.

  The polyisocyanate used in the polyurethane-based cement composition of the present invention has good workability, fast curing at low temperature, and high hardness of the coating film after curing. The NCO equivalent is preferably 100 to 150. When the NCO equivalent is less than 100, the finish of the cured coating film is poor, and when the NCO equivalent exceeds 150, the coating film hardness is insufficient. Other aliphatic polyisocyanates, aromatic polyisocyanates, alicyclic polyisocyanates, etc., have a 60-degree specular gloss of a cured coating film having a thickness of 1.5 mm or more and less than 2.5 mm of 85 or more, and have a type D durometer hardness. If is 80 or more, it can be used.

  In addition, the number of isocyanate groups of the polyisocyanate with respect to one hydroxyl group of the water-dispersed polyol used in the present invention is preferably 1.5 to 2.0. Fine foaming due to carbon dioxide gas may occur in the cured coating film.

  In the polyurethane-based cement composition according to the present invention, a diluent can be blended in addition to the above, and the diluent does not adversely affect the workability of application to the base and the smoothness of the coated film after application. Examples thereof include benzoic acid glycol ester. The benzoic acid glycol ester is a condensed ester compound of benzoic acid and a glycol compound, and diethylene glycol, dipropylene glycol or the like can be used as the glycol compound. As a commercially available benzoic acid glycol ester, there is benzoic acid glycol ester JP120 (trade name, manufactured by J-Plus Co., Ltd.), which is a mixture of diethylene glycol dibenzoate and dipropylene glycol dibenzoate. The blending amount of the diluent is preferably 1 to 2 parts by weight in a total of 100 parts by weight of the water-dispersed polyol, the polyisocyanate, and the diluent. If it is too high, the JIS K 7215 Type D durometer hardness of the 23 ° C. cured coating will decrease.

  The cement used in the polyurethane-based cement composition of the present invention is intended to impart an aesthetic appearance by applying the polyurethane-based cement composition of the present invention to floor foundation concrete, so that a specific color tone can be imparted mainly. It is preferred to use white Portland cement. 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 20 parts by weight in 100 parts by weight of the whole composition. If the amount is less than 5 parts by weight, the surface finish of the coating film is poor, and if it exceeds 20 parts by weight, the workability when applied to the base is poor.

As the filler used in the polyurethane cement composition of the present invention, calcium carbonate represented by heavy calcium carbonate, clay, kaolin, talc, precipitated barium sulfate, barium carbonate, cinnabar, etc. can be used. When the polyurethane-based composition of the present invention is applied with a thickness of 1.5 mm, the size may be such that the filler particles do not appear as irregularities on the surface of the coating film. 100~500μm preferably an average particle diameter _{D 50.} The average particle diameter D ₅₀ workability becomes poor at the time of applying to the substrate as a polyurethane-based cement composition is less than 100 [mu] m, the average particle diameter D ₅₀ is 500μm greater than the coating when subjected coated in a thickness of 1.5mm In some cases, the film surface is uneven, or minute protrusions due to the filler are generated to make the film surface non-smooth and to reduce gloss. Commercially available heavy calcium carbonate K-250 as a filler to meet these (Asahiko subordinate shrine Co., Ltd., average particle size _D 50: 200 [mu] m), Tohoku silica sand No. 6 (trade name, Tohoku silica sand Ltd., average particle diameter _{D 50} : About 340 μm).

  The blending amount of the filler is 30 to 55 parts by weight in 100 parts by weight of the entire composition. In particular, the polyurethane-based cement composition of the present invention is applied as a primer to a thickness of 0.2 mm or more and less than 0.6 mm. In this case, 30 to 45 parts by weight is preferable, and when the polyurethane cement composition of the present invention is applied as a top coat to a thickness of 1.5 mm or more and less than 2.5 mm, 40 to 55 parts by weight is preferable. When it is applied as an undercoat, if the filler is less than 30 parts by weight, filling of fine holes on the surface of the underlying concrete is insufficient, and if it exceeds 45 parts by weight, the coating workability is poor. When applied as a top coat, if the filler is less than 40 parts by weight, the viscosity of the composition is too low, resulting in poor workability when applied with a hammer, and if over 55 parts by weight, the smoothness of the cured coating film Is insufficient.

  In addition to the above, slaked lime is preferably added to the polyurethane cement 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, concentrates on a specific part, resulting in a coating film. This has the effect of suppressing the occurrence of swelling by pushing up the. As a compounding quantity of slaked lime, 1-5 weight part is preferable with respect to 100 weight part in 100 weight part of this composition whole. If the amount is less than 1 part by weight, the above effect may be insufficient, and if it exceeds 5 parts by weight, the coating workability may be insufficient.

  When applying the polyurethane-based cement composition of the present invention to floor foundation concrete, first, a brittle layer such as latency on the floor foundation concrete surface is removed by polishing or the like. Next, the paste-like polyurethane cement composition of the present invention is applied as an undercoat to a thickness of 0.2 mm or more and less than 0.6 mm and cured, and then the paste-like polyurethane cement composition of the present invention is overcoated. As a result, it is applied to a thickness of 1.5 mm or more and less than 2.5 mm. The coating is preferably performed using a metal hammer or the like, and the coating thickness after curing is approximately 1.7 mm to 3.1 mm.

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

Example 1
A mixture of castor oil-modified bifunctional polyol and castor oil-modified trifunctional polyol is composed of 20% by weight, 40% by weight of bis (2-butoxyethyl) phthalate, 38% by weight of water, and 2% by weight of an emulsifier. Add 5 parts by weight of colored toner (pigment concentration: 80% by weight) to 95 parts by weight of water-dispersed polyol A to make 100 parts by weight of the main agent, and use polymethylpolyphenyl polyisocyanate having an NCO equivalent of 135 as the polyisocyanate to cure 100 200 parts by weight of a powder part in which 20% by weight of commercially available white cement, 75% by weight of heavy calcium carbonate K250 (produced by Asahi Mine Company, average particle diameter D ₅₀ : 200 μm) and 5% by weight of slaked lime are uniformly mixed. And 100 parts by weight of the main agent, 100 parts by weight of the curing agent, and 200 parts by weight of the powder part are uniformly mixed, and the polyurethane system of Example 1 The undercoating instrument composition was overcoated polyurethane-based cement compositions of Example 1 and a powder portion 300 weight and curing agent to 100 parts by weight of a base material 100 parts by weight evenly in admixture.

Example 2
A mixture of castor oil-modified bifunctional polyol and castor oil-modified trifunctional polyol is composed of 20% by weight, 40% by weight of bis (2-butoxyethyl) phthalate, 38% by weight of water, and 2% by weight of an emulsifier. 90 parts by weight of water-dispersed polyol A, 7 parts by weight of a colored toner (pigment concentration: 80% by weight) and 3 parts by weight of JP120 (trade name, manufactured by J-Plus Co., Ltd.) as a diluent are added to make 100 parts by weight of a base. As the isocyanate, polymethylphenyl polyisocyanate having an NCO equivalent of 135 and a viscosity of 600 mPa · s / 23 ° C. (BM type viscometer rotor No. 3 60 rpm) is used as 100 parts by weight of a curing agent, and 30% by weight of commercial white cement and Tohoku 200 parts by weight of powder part in which 65% by weight of cinnabar No. 6 and 5% by weight of slaked lime are uniformly mixed, and 100 parts by weight of the main agent 100 parts by weight of the hardener and 200 parts by weight of the powder are uniformly mixed to form an undercoat of the polyurethane cement composition of Example 2, and 100 parts by weight of the main agent, 100 parts by weight of the hardener, and 275 parts by weight of the powder. Were uniformly mixed to form a top coat of the polyurethane cement composition of Example 2.

Comparative Example In place of 95 parts by weight of the water-dispersed polyol A used in Example 1, 38% by weight of castor oil having a hydroxyl group equivalent of 350, 5% by weight of an epoxy-modified tetrafunctional polyol having a hydroxyl group equivalent of 360, and a sulfonic acid ester compound (mesamol; product) (Name, manufactured by Bayer) 25% by weight, 30% by weight of water and 2% by weight of an emulsifier, and the same polyurethane system as in Example 1, except that 95 parts by weight of water-dispersed polyol B having a hydroxyl equivalent weight of 750 was used. An undercoat of the cement composition or an overcoat of the polyurethane cement composition of the comparative example was used.

Evaluation items and evaluation methods

Compressive strength According to JIS K 6911 5.19 compressive strength, each of the overcoats of polyurethane cement compositions of Examples and Comparative Examples was cured in a shape 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.

Adhesiveness of Example 5 and Comparative Example of mixing uniformly on the surface of a dried concrete flat plate (5% or less in Ket Moisture Meter HI-520 Concrete Range) of 300 mm x 300 mm x 60 mm thickness of JISA 5371 at 23 ° C The undercoat of the polyurethane cement composition was applied with a gold trowel to a thickness of 0.4 mm, cured by curing for 24 hours, and then uniformly mixed with the polyurethane cement compositions of the examples and comparative examples. It was applied with a gold trowel to a thickness of 1.6 mm, cured for 24 hours and cured, and then cured for 7 days. Thereafter, the adhesion strength (N / mm ² ) between the 40 × 40 mm portion of the water-based polyurethane composition and the concrete flat plate was measured with a Kenken-type adhesive strength tester. As for the fracture state, 100% cohesive fracture of the ground concrete was evaluated as “good”, and the others were evaluated as “poor”.

After applying the undercoat of Example or Comparative Example to a thickness of 0.4 mm on a fiber reinforced cement plate of JISA 5430 with a mirror gloss of 23 ° C. and a thickness of 0.4 mm, respectively, the top coat of the Example or Comparative Example is applied. After coating and curing to a thickness of 1.6 mm and curing for 24 hours, the 60-degree specular gloss specified in JISK 5600-4-7 was measured.

About the hardened | cured material of the polyurethane-type cement composition of the Example before a measurement of the said compressive strength under the coating-film hardness 23 degreeC, or a comparative example, the type D durometer hardness prescribed | regulated to JISK7215 was measured.

After applying the undercoat of Example or Comparative Example to a thickness of 0.4 mm on a fiber reinforced cement board of JISA 5430 having a surface property of 23 ° C. and a thickness of 20 cm × 20 cm × 0.4 mm, each of Examples and Comparative Examples was cured. Each of the top coats was applied to a thickness of 1.6 mm and cured, and after curing for 24 hours, the state of the coating film surface was visually observed. A smooth sample was shown as “◯”, and a non-smooth sample with waviness on the coating film surface was shown as “X”.

Evaluation results The evaluation results are shown in Table 1.

Claims (3)

  A polyurethane polyurethane cement composition comprising a water-dispersed polyol, a polyisocyanate, a cement and a filler, and applied to a thickness of 0.2 mm or more and less than 2.5 mm, wherein the water-dispersed polyol is castor It consists of an oil-modified bifunctional polyol, castor oil-modified trifunctional polyol, bis (2-butoxyethyl) phthalate, an emulsifier, and water. The hydroxyl group equivalent of the water-dispersed polyol is 200 to 250, 1.5 mm to 2.5 mm A polyurethane-based cement composition having a JIS K 5600-4-7 60 ° specular gloss of 85 or more and a JIS K 7215 Type D durometer hardness of 80 or more.   2. The polyurethane cement composition according to claim 1, wherein the polyisocyanate is polymethyl polyphenyl polyisocyanate. The polyurethane cement composition according to claim 1 or 2 is applied as an undercoat to a floor base concrete surface to a thickness of 0.2 mm or more and less than 0.6 mm, and then the polyurethane cement composition is further cured. A concrete floor construction method characterized in that the coating is finished to a thickness of 1.5 mm or more and less than 2.5 mm.