JPH02117973A - Coating material - Google Patents

Abstract

PURPOSE:To obtain a coating material suitable for application to an wet surface and a surface where water is continuously oozing and for underwater coating and excellent in adhesion by dispersing calcium oxide powder into a vehicle. CONSTITUTION:Calcium oxide powder is dispersed into a vehicle (e.g., epoxy resin, unsaturated polyester resin or polyurethane resin), preferably in an amount of 5-40wt.% [pigment volume concentration of coating material(PVC)] to provide the objective coating material suitable for waterstop application in construction and building work, application to a wet surface and underwater coating.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a coating material that is applied or lined on a wet surface or underwater, and is particularly applicable to waterproof construction in civil engineering, construction, etc., wet surface coating, and underwater coating. applicable.

Of course, this coating material can be applied to steel, stainless steel,
It can also be applied to aluminum.

(Prior art) Epoxy,
Alternatively, polyester-based underwater curable paints are known.

(Problem to be solved by the invention) However, with such underwater curing paints, for surfaces where water continuously seeps out from inside, the paint film is damaged by internal pressure before it hardens. There is currently no effective coating material for this type of surface because it is pushed up and therefore does not adhere to the surface to be coated at all and is easily peeled off.

SUMMARY OF THE INVENTION An object of the present invention is to provide a coating material that can be applied to wet surfaces or underwater, and that has good adhesion to concrete, etc., where water continuously seeps out from inside. It is in.

(Means for Solving the Problems) The present invention is characterized in that calcium oxide powder is dispersed in a color vehicle.

Calcium oxide powder has a particle size of 0.5 to 10
The particle size is about 0.00 microns and has been sufficiently dehydrated and dried, and the desirable particle size is 0.5 to 50 microns.

In addition, as a color vehicle, epoxy resin, unsaturated polyester resin, polyurethane resin, phenol resin, multi-component reactive resin such as acrylic resin, vinyl chloride resin, alkyd resin, chlorinated polyolefin resin, vinyl chloride vinyl acetate copolymer, One selected from resins that form a coating film by solvent evaporation, such as butyral resin, or a combination of these can be used.

In addition, as pigments other than calcium oxide, one or more selected from extender pigments used for paints, coloring pigments, antirust pigments, flake pigments, reinforcing fibers, and cement may be used in combination.

Furthermore, in order to improve the applicability to wet surfaces in water and the adhesion of the coating film to the substrate, the above composition may include silane coupling agents, surfactants, chelating agents, amine salts of polycarboxylic acids, etc. It is also possible to add one or more selected from the following.

In addition, in order to improve efficiency during coating, epoxy,
It is also effective to use a polyester-based underwater curable paint resin.

The underwater curable coating resin exhibits the effects of the invention regardless of its type as long as the base resin has underwater curability, but epoxy resins and unsaturated polyesters are particularly used.

In the case of epoxy resin, the epoxy resin for the main resin is:
A liquid at room temperature containing at least one epoxy group in one molecule and having an epoxy equivalent of 70 to 1000 is preferred;
These include glycidyl ethers such as formalin condensates of bisphenol A1 bisphenol F1 phenol, and glycidyl esters of polycarboxylic acids such as adipic acid, phthalic acid, and dimer acid.

Curing agents for epoxy resins include aliphatic amines, alicyclic amines, aromatic amines, or amide-modified products, adduct-modified products, Mannich reaction-modified products, Michael reaction-modified products, and carbonyl-modified products. and mixtures thereof may be used as necessary.

In the case of polyester resins, unsaturated polyester resins such as vinyl, acrylic, and epoxy, and vinyl monomers such as styrene, vinyltoluene, and methacrylic acid are used as polymerization accelerators such as cobalt naphthenate, cobalt octenoate, copper naphthenate, and naphthene. It is a resin composition that cures at room temperature using acid magazine, dimethylaniline, diethylaniline, etc., and methyl ethyl ketone peroxide, isobutyl methyl ketone peroxide, cumene hydroperoxide, etc. as a curing agent.

The appropriate content of calcium oxide, which is a water-absorbing substance, in the color vehicle is 5 to 40% in terms of pigment volume concentration (PVC); if it is less than 5%, sufficient water-absorbing effect and calorific value cannot be obtained. Moreover, if it exceeds 40%, it becomes brittle and at the same time it becomes difficult to cross wires, making it impossible to form it into a paint.

(Function) Calcium oxide, as used in a desiccant, has hygroscopic and water-absorbing properties, and also reacts with water to release a high heat of reaction.

CaO+HO-+Ca (OH) 2+15.2Kc
a1 Then, the calcium oxide in the coating material absorbs this seeping water or water from the wet surface and generates heat, which accelerates the reaction rate between the multi-component color vehicle, such as the epoxy resin and the modified amine curing agent. In addition, the solvent evaporation type color vehicle utilizes the effect of accelerating the evaporation rate of the solvent contained therein.

If a multi-component reaction type vehicle that does not contain a solvent is used in the paint, it can be applied in air or water, or a solvent evaporation type vehicle can be used for wet surfaces in the air.

In this way, in the present invention, calcium oxide absorbs water seeping out from inside concrete, etc., and the reaction heat accelerates the curing rate of the resin or the rate of solvent evaporation, and the water leaks out from the surface. It has improved adhesion.

(Effects of the Invention) The coating material according to the present invention can be applied not only to wet surfaces and underwater coating materials, but also to surfaces where water continuously seeps out, and has good adhesion.

(Example) Examples 1 to 6 Regarding Comparative Examples 1 to 2, epoxy resin (manufactured by Shell Chemical Co., Ltd., trade name Epicote 828) was used as the main resin, and modified Boriamen (manufactured by Asahi Denka Kogyo Co., Ltd., trade name Adeka Hardener El+-229) was used as the main resin. The results shown in Attached Table 1 were obtained with the compounding system used as a curing agent.

(The blending amount is shown in parts by weight.) The mixing and kneading method, preparation of the coating material, testing method, and evaluation method are as follows.

Mixing and kneading method: Three rolls.

Preparation of paint: Immediately before use, thoroughly mix the proportions of each component indicated by the small amount.

Test method: Water was drained from a fire prevention water tank that had been used for many years, and the water seeped out from the concrete wall surface, which had been cleaned with a high-pressure washer. Then, the coating material prepared in the above method was applied using a rubber spatula. After curing for 70 minutes, the adhesive strength was measured.

Evaluation method: When applying with a rubber spatula, the mark O indicates that the product was easily applied in 2 reciprocations, the mark Δ indicates that the application was possible in 3 to 6 reciprocations, and the mark Δ indicates that it took more reciprocations or could not be applied at all. I marked it with an X.

The adhesive strength was measured using an adhesion tester (manufactured by Elcometer) by adhering a jig to this surface with an epoxy resin adhesive. (fl?I constant value indicates the average value of 3 points.

) Examples 7 to 11 Comparative Examples 3 to 4 The results shown in Attached Table 2 were obtained using a system using a color vehicle prepared by dissolving chlorinated polypropylene (manufactured by Yamaba Valve Co., Ltd., trade name: Super Chron 406) in Kijirol. (The formulation is shown in parts by weight.) The mixing and kneading method, preparation of the coating material, testing method, and evaluation method are the same as in Examples 1 to 6.

As shown in the examples, the coating material containing calcium oxide exhibits the water absorption and heat generation properties of calcium oxide on surfaces where water continuously seeps out, and has excellent applicability, curing/drying properties, and adhesion. was found to be significantly improved.

It should be noted that the general adhesion force between a concrete surface and a dry surface of paint is considered to be good if it is about 10 to 15 kg/c-.

that's all Patent applicant: Chugoku Paint Co., Ltd. , voice□ Agent Patent Attorney Matsu 1) Kazuko (1″′-1′

Claims (2)

[Claims] (1) A coating material characterized by dispersing calcium oxide powder in a color vehicle. (2) The content of the calcium oxide powder according to claim 1 is 5 to 40 in pigment volume concentration (PVC) of the coating material.
A coating material characterized by being %.