JP2011099207A - Method for constructing heat-resistant coated floor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for constructing a heat-resistant coated floor which can be utilized as a floor of a food factory, a kitchen floor, etc., which prevents a crack and the like from being formed by a hot liquid, which is excellent in surface smoothness, which has heat resistance, and which is also excellent in long-term color stability. <P>SOLUTION: Characteristically, in this method for constructing the heat-resistant coated floor, after a base mortar layer is formed of a polyurethane-based cement mortar composition containing hydraulic cement, water, polyol, an isocyanate compound and aggregate, a composition containing aggregate and a resin selected from a methyl methacrylate resin and a vinylester resin is applied onto the base mortar layer, so as to form a top coat layer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for constructing a heat-resistant coating floor, and more specifically, a heat-resistant coating floor excellent in surface smoothness that can withstand an environment where hot water is repeatedly used, such as a floor of a food factory or a kitchen floor. It relates to the construction method.

  Polyurethane cement mortar compositions with excellent heat resistance, hot water impact resistance, impact resistance, chemical resistance, wear resistance, etc. are used for floors with severe conditions that repeatedly use hot water, such as food factories and kitchen floors. Opportunities are increasing.

  This polyurethane cement mortar composition is composed of a hydraulic cement, water, a polyol, an isocyanate compound and an aggregate. By mixing each of the above components in the field, a hydration reaction between water and the hydraulic cement, a polyol The urethanation reaction between styrene and isocyanate and the urea formation reaction accompanied by the generation of carbon dioxide by isocyanate and water proceed simultaneously and cure. And since the composition after curing is hard and excellent in wear resistance, and in addition, it is excellent in heat resistance and chemical resistance, it is durable on industrial floors such as factory floors such as food factories, chemical factories, and machine factories. It is used as an excellent flooring material.

  However, although this polyurethane-based cement mortar composition is excellent in performance such as abrasion resistance, impact resistance, and heat resistance, it has a large shrinkage of the composition generated during the curing reaction of hydraulic cement, water, polyol, and isocyanate compound. Therefore, there is a problem that cracks are likely to occur on the surface due to the influence of steam and hot water used for floor cleaning. Therefore, when used as a flooring in a place where the temperature of hot water used exceeds 60 ° C., in order to reduce the effect of hardening shrinkage, the amount of aggregate components that do not contribute to the reaction is increased to reduce the shrinkage of the composition. However, it was necessary to prevent surface cracks and peeling from the underlying concrete.

  As an aggregate component blended in the above polyurethane cement mortar composition, cinnabar sand or coconut scrap having a particle diameter of 1 to 4 mm is often used. If the particle size of the aggregate component is smaller than this, the aggregate in the material tends to sink below, causing a large amount of the resin component to easily shrink on the surface, and conversely if larger than this, the coating material is applied. It tends to cause a significant decrease in performance.

  Therefore, in order to exhibit durability against steam and hot water used for floor cleaning, the surface of the above-mentioned polyurethane cement mortar composition is arranged with a good balance of aggregate and resin having a particle size of 1 to 4 mm. The condition is preferable, and the finished floor material surface is characterized by having moderate irregularities.

  By the way, the unevenness on the surface of the flooring material exerts an effect of suppressing slipping when the floor is wet with water, but on the other hand, since the unevenness is one of the causes of the growth of dirt and germs, HACCP As a floor for food factories, it is essential that the floor finish should be a smooth surface, and heat-resistant coating materials with smoothness are becoming increasingly important, especially in food factories.

  Therefore, it is required to ensure the smoothness of the surface using a polyurethane cement mortar composition, and such a smooth surface can be applied by appropriately adjusting the aggregate and imparting fluidity to the composition. It becomes possible to obtain by doing. However, in that case, it is necessary to provide flexibility that can cope with the contraction force due to the repeated action of heat accompanying the decrease in the amount of aggregate.

  Conventionally, as a method for imparting flexibility to a polyurethane base composition, the compounding ratio of an active hydrogen-containing compound and an isocyanate is limited to reduce the shrinkage (Patent Document 1), or the liquid paraffin of the polyurethane base composition. Methods of mixing (Patent Document 2) and the like have been proposed. However, none of these methods provide sufficient surface smoothness.

（ｎは、０ないし４の数を示す）
で表される多核ポリフェニレンポリメチルポリイソシアネート、（以下、「粗ＭＤＩ」と略す）が一般的であるが、この粗ＭＤＩをイソシアネート化合物として使用する場合の別の課題として、反応硬化後の塗膜の色安定性の問題が挙げられる。すなわち、粗ＭＤＩの原料は、褐色となっているものが多く、また、祖ＭＤＩ自体が室内照明や殺菌投などから発する紫外線により変色しやすいため、明彩色系の色合いをもつ床材での利用には限界があった。 Moreover, as an isocyanate compound mix | blended with a polyurethane base composition, from the surface of workability | operativity and curability, the following general formula (I)

(N represents a number from 0 to 4)
The polynuclear polyphenylene polymethyl polyisocyanate represented by the formula (hereinafter abbreviated as “crude MDI”) is generally used, but as another problem when this crude MDI is used as an isocyanate compound, the coating film after reaction hardening is used. Color stability problems. In other words, the raw material of crude MDI is often brown, and the original MDI itself is easily discolored by ultraviolet rays emitted from indoor lighting or sterilization, etc., so it can be used for flooring with bright colors. There were limits.

  Therefore, in the construction of the coating material, there has been a demand for a construction method that prevents surface cracks and peeling from the underlying concrete, gives a highly smooth surface, and does not change the appearance color even after long-term use.

JP2002-12463 JP 2006-240933 A

  The present invention has been made in view of the above circumstances, and is a method for constructing a heat-resistant coating floor excellent in surface smoothness that can ensure long-term durability as a food factory, kitchen flooring, etc., and a conventional polyurethane base composition The object of the present invention is to provide a construction method for the above heat-resistant coating floor that is superior in color stability for a long period of time as compared with a coating floor using an object.

  As a result of earnest research to solve the above problems, the present inventor applied a topcoat layer containing a specific resin composition on a base mortar layer made of a polyurethane-based cement mortar composition, thereby achieving heat resistance. The present invention has been completed by finding that a coated bed that satisfies the properties, surface smoothness and light stability can be obtained.

  That is, in the present invention, a base mortar layer is formed from a polyurethane cement mortar composition containing hydraulic cement, water, polyol, isocyanate compound and aggregate, and then selected from methyl methacrylate resin or vinyl ester resin on the base mortar layer. A composition comprising a resin and an aggregate is applied to form a top coat layer.

  Since the heat-resistant coating floor by the construction method of the present invention is excellent in surface smoothness, it becomes a floor in which dirt and bacteria breeding hardly occur. In addition, since this coated floor is highly durable and does not deteriorate for a long time even by regular cleaning and sterilization with hot water or steam, it is intended for food factories compatible with HACCP and ISO 22000, kitchens, etc. Available as floor.

  The construction method of the heat-resistant coated floor of the present invention comprises forming a base mortar layer with a polyurethane cement mortar composition (hereinafter referred to as “base composition”) and then forming a methyl methacrylate resin or a vinyl ester resin thereon. A top coat layer is formed with a composition containing a resin selected from the above and an aggregate.

  The base composition forming this base mortar layer includes hydraulic cement, water, polyol, isocyanate compound and aggregate.

  The hydraulic cement used in this base composition means cements that harden or set when mixed with water, and preferred examples include ordinary Portland cement, early-strength Portland cement, white Portland cement (white cement) and Portland cement. And rapid setting type cement having a high alumina content.

  Examples of the polyol include hydrophilic polyols such as polyether polyol and polyester polyol, and hydrophobic polyols such as castor oil-based polyol, polybutadiene-based polyol, and hydrogenated polybutadiene-based polyol. Of these, hydrophobic polyols are preferable, and castor oil-based polyols are more preferable from the viewpoint of thermal stability, hydrolysis resistance, acid resistance, solvent resistance, abrasion resistance, and impact resistance. Among these castor oil-based polyols, particularly preferred are those having a hydroxyl value of 85 to 350 and a functional group number of 2.5 to 5.

  Furthermore, examples of the isocyanate compound include aliphatic polyisocyanates such as hexamethylene diisocyanate, isophorone diisocyanate, and xylylene diisocyanate, tolylene diisocyanate, diphenylmethane-4,4'-diisocyanate (MDI), and the like.

  Furthermore, as the aggregate, known inorganic aggregates or organic aggregates can be used, but inorganic aggregates are preferable. As this inorganic aggregate, natural siliceous materials such as river sand and silica sand, those obtained by pulverizing inorganic materials such as glass, ceramics, fused alumina and silicon carbide, and inorganic hollow materials such as glass balloons and shirasu balloons can also be used. . The particle size of the inorganic aggregate is preferably 0.05 to 4 mm.

  The general blending amount and preferred blending amount of hydraulic cement, water, polyol, isocyanate compound and aggregate in the base composition are as follows.

Component General range Preferred range Hydraulic cement 5-20 9-12
Water 2-5 2-3
Polyol 2-5 2-3
Plasticizer 2-4 2-3
Isocyanate compound 10-15 9-12
Aggregate 60-80 65-70

  In addition, a water reducing agent, an emulsifier, a dispersant, a surface conditioner, a pigment, and the like can be blended as optional components in the base composition.

  On the other hand, the composition for forming the topcoat layer in the construction method of the present invention (hereinafter referred to as “coating composition”) is selected from a room temperature curable or thermosetting methyl methacrylate resin or vinyl ester resin. Includes resin and aggregate.

  Among these, a methyl methacrylate resin (hereinafter referred to as “MMA resin”) is a copolymer with a methacrylic acid ester or an acrylic acid ester, and a preferable example thereof is a copolymer with a low odor acrylic monomer. And a low odor MMA resin using the MMA resin.

（式中、Ｒ_１は水素原子またはメチル基を示し、Ｒ_２はＣ_１ないしＣ_４のアルキル基を
示す）

(In the formula, R ₁ represents a hydrogen atom or a methyl group, and R ₂ represents a C ₁ to C ₄ alkyl group.
Show)

Among these, a preferable group R ₂ includes a methyl group. Examples of commercially available MMA resins include Acrymate 7500, 2700 (manufactured by DH Material Co., Ltd.), Acrytone Floor FT-130, FT-523, TF-524, LT-9640 (manufactured by Ryokan Co., Ltd.). Etc., and these can be used.

  A vinyl ester resin (hereinafter referred to as “VE resin”) is obtained by reacting an epoxy resin with methacrylic acid and adding methacrylic acid to the terminal, and a preferred example thereof is represented by the following formula. And a low odor vinyl ester resin obtained by copolymerizing a bisphenol-type vinyl ester resin excellent in acid resistance and alkali resistance and a low odor monomer.

  Examples of commercially available VE resin products include Dicklight UE-5101-L, UE5210, UE-3505, UE-2083, UE-7016, UE-1150 (manufactured by DIC Corporation), Lipoxy R804, R802, R806, H600. , H610, NSR112T (manufactured by Showa Polymer Co., Ltd.) and the like can be used.

  Furthermore, as the aggregate in the top coating composition, scales such as calcium carbonate, talc, cinnabar powder, mica powder, glass flakes, fibrous powders such as titanium oxide, barium sulfate, potassium titanate, columnar powders, needles Examples include powders. The top coat layer formed from the top coating composition preferably has a smoothness of an average roughness (Ra) of 30 μm or less. It is preferably about 5 to 20 μm.

  The general and preferred blending amounts of MMA resin or VE resin and aggregate in the top coating composition are as follows.

Component General range Preferred range MMA resin or 50-90 70-85
VE resin aggregate 10-50 15-30

  Furthermore, a coloring pigment, an antifoamer, a dispersing agent, etc. can be mix | blended with the said top-coat composition as an arbitrary component. The coloring pigment, antifoaming agent, dispersing agent and the like are not particularly limited, and can be adjusted and used so as to obtain a good surface property as a finishing material.

  The coating floor construction method of the present invention is performed as follows. That is, the base mortar layer is prepared by thoroughly mixing the base composition described above and making it uniform, and then applying and curing to a uniform thickness using a dedicated construction tool such as a wooden trowel or a gold trowel. Form.

  The base on which the coating floor is formed mainly means a new concrete foundation or an existing concrete foundation for repair use, and includes a floor surface of a civil engineering building or the like. The base composition is mixed using a mixing means such as a mortar mixer or a container rotating pail can mixer. Furthermore, the application of the base composition on the substrate can be performed by, for example, troweling, pouring, or other suitable methods.

  The base mortar layer is usually applied with a thickness of 1 to 10 mm, and preferably with a thickness of 3 to 5 mm.

  Next, after the base mortar layer is cured, the top coating composition is applied to form a top coat layer. The application of the top coating composition can be performed anytime after the base mortar layer has been applied as long as the base mortar layer is surface-cured, but it is usually preferable to perform the application after 4 to 16 hours.

  The topcoat layer is formed by thoroughly mixing and uniforming the topcoat composition and then applying the topcoat layer on the base mortar layer with a gold trowel or roller brush. The top coating composition can be mixed with a low speed to high speed stirrer.

  The thickness of the top coat layer is usually 0.1 to 4 mm, and preferably 0.4 to 2 mm. Further, the surface roughness (Ra) is preferably 30 μm or less.

Prior to the topcoat layer construction, the same composition as the topcoat composition is targeted at about 0.1 to 0.4 kg / m ² in order to prevent the influence of fine voids existing on the surface of the base mortar layer. It is preferable to apply the topcoat layer after the treatment.

  The coated floor of the present invention constructed as described above contains a MMA resin or a VE resin on a base mortar layer having a thickness of 1 to 10 mm, and a smooth topcoat layer having a thickness of 0.1 to 4 mm. Since it is coated on the surface, it can be used as a food factory / kitchen floor, and it can be used as a floor with excellent surface smoothness and heat resistance.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in more detail, this invention is not restrict | limited at all by these Examples.

Examples 1 to 4 and Comparative Examples 1 and 2
On the concrete flat plate as the substrate, the base composition and the top coating composition shown in Table 1 below were used to form a coating floor composed of a base mortar layer and a top coat layer with the application amounts shown in the same table.

  In addition, the base mortar layer is applied by distributing the base composition with a wooden trowel, pressing the surface with a gold trowel, performing a sealing treatment after a lapse of 16 to 24 hours after the construction of the base mortar layer, and after the sealing treatment. After 1 to 4 hours, the top coat layer was applied with a gold trowel.

注１） ケミクリートＭトップコート基剤、（株式会社エービーシー商会）
引張強度（２５ＭＰａ）、伸び率（５％）、低臭タイプ
注２） ケミクリートＶ基剤、（株式会社エービーシー商会）
引張強度（４０ＭＰａ）、伸び率（３％）、低臭タイプ
注３） 平均粒径２０ミクロン
注４） 平均粒径２０ミクロン
注５） 平均粒径４５ミクロン
注６） ケミクリートＭトナー（株式会社エービーシー商会）着色顔料
注７） ８％ナフテン酸コバルト
注８） クメン酸パーオキサイド他混合過酸化物
注９） 主剤として、水分散型ポリオール（住化バイエル：ＶＰＬＳ２２４８）
７３部、ポリエステルポリオール｛協和発酵株式会社：キョ−ワポール
２０００ＢＡ、官能基数２、水酸基価５３〜５９ｍｇＫＯＨ／ｇ、酸化
０.５ｍｇＫＯＨ／ｇ以下、粘度１８.４Ｐａ・Ｓ／２５℃｝１２部、
トナー５部、消泡剤｛共栄社化学株式会社：フローレンＡＣ１１６０｝
１０部を配合した。
注10） 硬化剤として、ＭＤＩ系疎水性イソシアネート｛日本ポリウレタン工業
株式会社：ＷＣ−１０３、ＮＣＯ含有量２０％｝７５部、ポリメリツク
ＭＤＩ（ＢＡＳＦ ＩＮＯＡＣ：ＭＢ−５Ｓ、ＮＣＯ含有量３１％）２５
部を配合した。
注11） 骨材１として、水硬性セメント含有骨材９００部（骨材の最大粒形約５
ｍｍ以下）
注12） 骨材２として、水硬性セメント含有骨材５００部（骨材の最大粒形約１
ｍｍ以下）

Note 1) Chemicreet M Topcoat Base (ABC Corporation)
Tensile strength (25 MPa), elongation (5%), low odor type Note 2) Chemicrete V base (ABC Corporation)
Tensile strength (40 MPa), elongation (3%), low odor type Note 3) Average particle size 20 microns Note 4) Average particle size 20 microns Note 5) Average particle size 45 microns Note 6) Chemicrete M toner (ABC Co., Ltd.) Shokai) Colored pigments Note 7) 8% Cobalt naphthenate Note 8) Cumene peroxide and other mixed peroxides Note 9) Water-dispersed polyol (Sumika Bayer: VPLS2248) as the main agent
73 parts, Polyester polyol {Kyowa Hakko Co., Ltd .: Kyowapol
2000 BA, number of functional groups 2, hydroxyl value 53-59 mgKOH / g, oxidation
0.5 mgKOH / g or less, viscosity 18.4 Pa · S / 25 ° C.} 12 parts,
5 parts of toner, antifoaming agent {Kyoeisha Chemical Co., Ltd .: Floren AC1160}
10 parts were blended.
Note 10) As a curing agent, MDI hydrophobic isocyanate {Nippon Polyurethane Industry
Corporation: WC-103, NCO content 20%} 75 parts, Polymeric
MDI (BASF INOAC: MB-5S, NCO content 31%) 25
Parts were blended.
Note 11) As aggregate 1, 900 parts of hydraulic cement-containing aggregate (maximum aggregate particle size of about 5
mm or less)
Note 12) As aggregate 2, 500 parts of hydraulic cement-containing aggregate (maximum aggregate particle size of about 1)
mm or less)

  About each obtained coating floor, after measuring the surface roughness (Ra), the ultraviolet irradiation test, the impact resistance test, and the cooling / heating repetition test were done. Each test was implemented by the following method. The results are shown in Table 2.

(I) UV irradiation test:
One germicidal lamp was placed at a height of 200 mm from the surface of each coating floor and irradiated with this. As the germicidal lamp, “sterilizing lamp GL15” manufactured by Toshiba Corporation was used.
(B) Impact resistance test:
A 1 kg steel ball was dropped 30 times from a position of 1 m in height from the surface of the coating floor, and the state of damage to the coating floor was observed.
(C) Cooling heat repetition test:
95 ° C. hot water was allowed to flow for 1 minute and 10 ° C. cold water for 14 minutes on the surface of each coating, which was defined as one cycle, and the surface state after each cycle was observed.

  From this result, the surface roughness is smaller and the coating is resistant to repeated heating and cooling than the coating layer (Comparative Example 2) which has been given a fluidity to a polyurethane composition which has been generally used in the past and has a smooth surface. It was revealed that the coating floor was excellent in fading and fading due to ultraviolet rays.

  The coated floor obtained by the present invention is free from cracks due to hot water, has excellent surface smoothness, heat resistance and long-term color stability.

Therefore, the coating floor construction method of the present invention can be advantageously used as a food factory floor, a kitchen floor or the like.

more than

Claims (5)

  A base mortar layer is formed from a polyurethane cement mortar composition containing hydraulic cement, water, polyol, isocyanate compound and aggregate, and then a resin and an aggregate selected from methyl methacrylate resin or vinyl ester resin are formed thereon. A method for constructing a heat-resistant coating floor, which comprises applying a composition containing, to form a topcoat layer.   The heat-resistant coated floor construction method according to claim 1, wherein the finished surface roughness (Ra) of the topcoat layer is 30 μm or less.   The construction method of the heat resistant coating floor according to claim 1 or 2, wherein the base mortar layer has a thickness of 1 to 10 mm.   The construction method of a heat resistant coating floor according to any one of claims 1 to 3, wherein the thickness of the top coat layer is 0.1 to 4 mm. A base mortar layer is formed from a polyurethane cement mortar composition containing hydraulic cement, water, polyol, isocyanate compound and aggregate, and then a resin and an aggregate selected from methyl methacrylate resin or vinyl ester resin are formed thereon. A heat-resistant coating floor for food factories or kitchens, wherein the composition is applied by applying a composition containing, and a top coat layer is formed, and the surface roughness (Ra) is 30 μm or less.