JP3027854B2 - Construction method of urethane coating material and its structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of applying a one-part moisture-curable coating material on a base of a building, and applying a fibrous material to which an active hydrogen-containing compound and / or a curing catalyst is attached to a surface. The present invention relates to a urethane coating structure in which the curability and surface finish of a coating layer are improved by arranging them, and a method for applying a urethane coating material.

[0002]

2. Description of the Related Art The use of urethane coating materials for structures includes known floor coating materials used for factories, apartment houses, schools, etc., coating film prevention materials for roofs (JISA602) for preventing water leakage of structures, It is known as a waterproof coating material for walls.

[0003] Although these urethane coating materials are of a one-component moisture-curing type, most of them are two-component types which are cured by a combination of a main component and a curing agent. In the case of the two-component type, the fiber material is used beneath the coating material or between layers.For example, in order to follow the cracks of the base and to make the film thickness uniform, in the case of the two-component type, the urethane prepolymer is used as one component. Since the composition containing the active hydrogen compound is classified as another component, the curing speed and the surface finish can be easily adjusted by adjusting any one of the components.

[0004]

The two-component urethane coating material is obtained by curing a coating film applied by a chemical reaction between a main component and a component contained in a curing agent at almost the same curing speed in the upper, middle and lower layers. In addition, the reactivity can be adjusted by preparing the main agent and the curing agent according to the season and environmental conditions, and the cured coating film can be formed without any problem.

However, the one-part moisture-curable urethane coating material is difficult to control the reaction according to the environment, as in the two-part moisture-curable urethane coating material. In particular, when a one-part moisture-curable urethane is prepared so that it cures quickly after application, the coating material itself tends to self-react in the storage container, resulting in poor stability, that is, lack of storage stability. However, there are drawbacks such as limited use.

In addition, in the case of a one-component moisture-curable urethane coating material, since the applied film undergoes a curing reaction from the surface in contact with the atmosphere, the inside of the coating film is hardened more slowly than the surface. Carbon dioxide gas generated when the isocyanate group undergoes a curing reaction with moisture that has penetrated remains in the coating film, causing the entire film to foam into a foam, the inside of the film to swell in a cavity, or the surface to become uneven. . These phenomena are common in hot and humid Japan in summer. On the other hand, in winter at low temperatures and low humidity, there is a shortcoming in that the moisture reacting with the isocyanate groups is insufficient, and the curing reaction is slow due to the low temperature.

[0007]

Means for Solving the Problems The present inventors have made intensive studies on the above-mentioned problems, and as a result, completed the present invention.

That is, the present invention relates to a method for applying a one-component moisture-curable urethane coating material, wherein a fiber material to which an active hydrogen-containing compound and / or a curing catalyst is attached is disposed on the application surface. The present invention provides a method for applying a urethane coating material, which is characterized by applying the above, and a urethane coating structure obtained by the method.

[0009]

[Constitution] One-component moisture-curable urethane coating material is described in detail. As the moisture-curable urethane coating material, one having a composition described in Japanese Patent Publication No. 38388/1993 as a moisture-curable coating waterproof material can be used.
The present invention is not limited to the range.

That is, in the urethane prepolymer, which is the base polymer of the one-part, moisture-curable urethane coating material of the present invention, the equivalent ratio of NCO / OH in the reaction between the polyol and the organic diisocyanate is 1. The reaction is preferably carried out at 2 to 2.0, and the properties of the obtained prepolymer can be set in hardness and viscosity depending on the polyol composition so as to be suitable for floor, roof waterproofing and wall waterproofing.

The polyols used in the present invention include:
Polyhydric alcohols having 2 to 3 hydroxyl groups in one molecule, for example, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol,
1,3-butylene glycol, 1,4-butylene glycol, 1,6-hexanediol, neopentyl glycol, bisphenol A, trimethylolethane, trimethylolpropane, glycerin, etc. and alkylene oxide such as propylene oxide, butylene oxide, styrene oxide Of polyalkylene ether polyols obtained by polymerizing singly or as a mixture, preferably having an average molecular weight of 200 to 8000.
Further, the above-mentioned polyhydric alcohols can be used as a mixture with a polyalkylene ether polyol.

As the organic diisocyanate used in the present invention, the diisocyanates used for ordinary urethane resins can be used. For example, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 2,4 / 2,
6 isomer ratio 65/35 (weight ratio) tolylene diisocyanate, 2,4 / 2,6 isomer ratio 80/20 (weight ratio) tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate,
Metaxylylene diisocyanate, phenyl diisocyanate, 1,5-naphthalenediisocyanate, water-added tolylene diisocyanate, water-added 4,4'-diphenylmethane diisocyanate, isophorone diisocyanate, etc., alone or in a mixture, preferably in liquid form at normal temperature Easy ones are preferred.

[0013] The moisture-curable urethane coating material of the present invention may be used as a catalyst for a urethane-forming reaction, such as lead naphthenate, lead octylate, lead stearate, etc., in order to promote curing with moisture. Organic lead compounds or tin compounds such as tin naphthenate, tin octylate, tin laurate, tetra-nbutyltin, n-butyltin trichloride, trimethyltin hydroxide, dimethyltin dichloride, dibutyltin dilaurate, etc. Can be added.

Other known additives such as whiskers, aluminum powder, copper powder, lead powder, silica, diatomaceous earth, alumina,
Inorganic fillers such as calcium carbonate, masonry, mica, clay, talc, asbestos, graphite, carbon fiber, glass fiber, glass powder, cement, linter, linen, sisal wood powder, silk, viscose, acetate, polyamide, vinylon And organic fillers such as synthetic resin powder, tire powder and rubber powder, coloring pigments, defoamers and the like.

Known solvents which do not react with isocyanate groups of toluene, xylene, ethyl acetate and terpenes can be used as the viscosity reducing agent. In addition, general phthalic acid-based and phosphoric acid-based plasticizers such as dioctyl phthalate, dibutyl phthalate, and didecyl phosphate can be used as the viscosity modifier.

The fiber material of the present invention is preferably a material obtained by previously treating the surface of a nonwoven fabric, woven fabric, cloth, net or the like with an active hydrogen-containing compound and / or a curing catalyst. Coarsely woven or knitted nets such as nonwoven fabrics, woven fabrics, cloths, and cold gauze are made of fibers, and are preferably made of synthetic fibers or glass fibers that are hardly corroded. The active hydrogen-containing compound that reacts fibrous materials of the isocyanate groups for processing pre Ji fit surface, a polyester polyol liquid at room temperature, polyether polyols, Poributajishin polyol, readily react with the isocyanate group such as an amino polyol Condensation of formaldehyde with polyols or commonly known monomers such as ethylene glycol, propylene glycol, triisopropanolamine and diethanolamine, or orthochloroaniline or a mixture of orthochloroaniline and aniline, which is called liquid MOCA Mixture of a product and a plasticizer or a polyol (Iharacuamine ML-150, ML-52
For both 0 and ML-530, Ihara Chemical Industries or Bisamine SL-5707 (manufactured by Wakayama Seika Kogyo) can be used alone or in combination. Curing catalysts that promote the reaction between moisture and isocyanate include tertiary amine catalysts such as triethylamine, triethylenediamine, N-methylmorpholine, N-ethylmorpholine,
N, N'-dimethylalkylamine, N, N'-diethylalkylamine, N, N, N ', N'-tetramethylpropylenediamine, hexamethylenetetramine, etc. can be used alone or in combination. Catalysts such as cobalt naphthenate, tin naphthenate, zinc naphthenate, lead naphthenate, zinc octylate, tin octylate, lead octylate, dibutyltin dilaurate, dimethyltin dilaurate, trinormal butyltin acetate, stannic chloride Can be used alone or as a mixture.

[0017] Also, a curing accelerator catalyst with an active hydrogen-containing compounds described above, may be used in combination. Method of treating the fiber materials of these surface treatment agents, dipping, squeezing, it is possible with known treatment methods of the winding. The treating agent may be treated by mixing with a viscosity reducing agent or the like. Moreover, when using for construction of a small area , you may process immediately before use.

The construction method of the present invention, on which spread the applied foundation on the aforementioned pre Ji because the treated fiber materials primers, usually used for one-component moisture curable urethane coating material It can be easily applied with a trowel, spatula, brush, spray, etc. When placing in the middle of the one-pack type urethane cured film layer laid fiber materials over coated with one-pack urethane coating material, perform an operation of further repaint thereon. This operation may be performed before the one-part urethane coating material is cured while applying it, or may be spread after the curing and applied from above. By repeating these operations several times, a sandwich structure can be formed.

The construction method of the present invention is a method for waterproofing a roof, a wall, a waterproof tank, a pool, a basement, a floor, a water tank, a bathroom, a sheet, etc., with a painted floor material, an outer wall of a concrete building, a lightweight foamed concrete plate, a molded concrete plate. It can be used as a material.

The structure according to the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a base for forming an underground base, which is generally used for an inorganic base, concrete panel, or wood board base, which is formed in situ or in a prefabricated form of concrete or mortar, and 2 denotes a base. It is a primer layer of a base treatment for adhering well to a one-component urethane coating material to be applied next and contributing to improvement in surface finish. Generally, this primer is selected and used depending on the kind and material of the base substrate. Specifically, a solution type of a synthetic rubber, an acrylic emulsion, an epoxy resin, or a urethane resin is generally used.

3 is a coating layer formed of a one-component moisture-curable urethane, which can have an arbitrary thickness, but is generally 0.5 to 5 mm in thickness. These thicknesses can be achieved by one application or more than one application. 4
Is applied with a material useful as a surface layer.

2 and 3 are nonwoven fabrics, woven fabrics,
It is a fiber material impregnated or coated with an active hydrogen compound that reacts with an isocyanate group in advance on the surface of a cloth, a net, or the like, or a catalyst that promotes the reaction between moisture and isocyanate.

Hereinafter, the present invention will be described with reference to Examples.
“Parts” and “%” are based on weight. Reference Example Calcium carbonate 900 having a particle system of 0.5 to 80 μm
g, 95 g of titanium oxide and 5 g of carbon black were weighed in a 4 l separable flask, and 500 g of xylene was added and mixed uniformly, then 20 g of T-80TDI was added, mixed at room temperature for 1 hour, filled with nitrogen gas, and left overnight. did.

The next day, the average molecular weight was 3000, the number of hydroxyl groups was 3,
1000 g of polyoxypropylene polyol having a hydroxyl value of 56.1 (mg KOH / g), 500 g of polyoxypropylene ethylene polyol having an average molecular weight of 2,100, two hydroxyl groups, and a hydroxyl value of 53.4 (mg KOH / g) having an ethylene oxide content of 10% by weight After removing xylene at 110 ° C. and a vacuum of 3 mmHg, 257 g of T-80TDI was added and reacted at 90 ° C. for 4 hours in a nitrogen stream to obtain an NCO% 2.0
A gray one-part, moisture-curable urethane coating material having a weight percentage of 50,000 cps (at 25 ° C.) was obtained. Using the one-component urethane obtained by this operation, the curability and the surface finish were evaluated on a substrate coated with a general urethane primer. The results were as shown in Table 1, and the effect was great. Examples 1 to 4 Using a fiber material treated at the positions shown in Table 1 on a concrete substrate, a moisture-curable urethane coating material of Reference Example was applied to a thickness of 3 mm to obtain a coating structure. .

The evaluation of the curability and surface smoothness of the coating film of the obtained structure is shown in Table 1. (Adjustment of processed fiber material (1)) Japan Vilene Co., Ltd.
Non-woven fabric part number OL-40 for FRP (with a basis weight of 42 g / m ² ,
Polyester) using Iharakyuamine ML-5
20 (Ihara Chemical Industry Co., Ltd., mixture of MOCA, plasticizer and polyether polyol) diluted with 30 parts by weight of xylene, immersed in the nonwoven fabric, and squeezed on a smooth glass plate , Excess processing agent was removed. (Preparation of treated fiber material (2)) Xylene was added to the above nonwoven fabric to a mixture of N-methyllaurylamine: dibutyltin laurate = 1: 1 by weight so that the concentration of the mixed catalyst became 10%. Impregnated with the nonwoven fabric in the solution,
The same processing as above was performed. Comparative example 1 It carried out similarly to Example 1 except not using a fiber material. <Evaluation method> 1) Curability at 5 ° C. Elapsed time from application until it is determined that the inside of the composition has been cured by applying finger pressure from the surface to the degree of curing. 2) Surface smoothness at 50 ° C. After curing and curing in an atmosphere at 50 ° C., visual evaluation of surface smoothness after curing.

[0026]

[Table 1]

[0027]

The construction method of the present invention is based on the one-component moisture-curable urethane coating material used in the summer, when the coating film is foamed at high temperature in summer, and the surface is uneven and hardened due to swelling. Since the delay of the curing reaction can be eliminated, it can be used as a construction method for floors, walls, ceilings, etc. of various structures and rooftop waterproofing materials.

[Brief description of the drawings]

FIG. 1 (A) shows a structure obtained by a normal coating material application method. FIG. 1B shows a structure according to the construction method of the present invention in which a fiber material is arranged on a primer. FIG. 1C shows a structure according to the construction method of the present invention in which a fiber material is disposed on a coating material layer.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base 2 primer layer 3 one-part moisture-curable urethane coating layer 4 surface layer 5 treated fiber material

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B05D 1/00-7/26

Claims (2)

(57) [Claims] 1. A method for applying a one-part moisture-curable urethane coating material, comprising arranging a fibrous material to which an active hydrogen-containing compound and / or a curing catalyst is attached on a working surface and applying the urethane coating material. A method for applying a urethane coating material characterized by the following. 2. A urethane coating structure obtained by the method according to claim 1.