JPS59107992A - Color coating composition for cement roof tile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel colored coating composition for cement tiles that has excellent strength and weather resistance. Specifically, it is a composition made by blending cement with specific mortar, pigments, and waterproofing agents.

In recent years, cement tiles with colored surfaces have come into widespread use as roof tiles for residential buildings and the like. Conventionally, as a method for coloring the surface of cement tiles as described above, for example, (1)
A method of electrostatically coating the surface of a dried cement tile molded product with an organic paint and then drying (curing). (2) Spraying a colored cement slurry on the surface of a cement tile molding and then drying or curing it. Method (3) Immediately after molding the cement tile, a colored cement slurry is sprayed on the surface, and if necessary, a transparent paint is further sprayed thereon, followed by a method 2 for curing. However, although all of the above methods are currently in use, each has drawbacks.

For example, if tiles obtained by method (1) are used for several months to 2 to 3 years, the paint film on the tile surface will fade or peel.
the? It will be necessary to repaint each time. Also, (2) and (3
) method, pigment and adhesive to cement.

A slurry (coating composition) containing various additives to impart weather resistance is used, but if the adhesion between the tiles and the slurry is poor, or if used for a long time, efflorescence may appear on the surface. However, there is still room for improvement since problems such as cracking, deterioration of the paint film, and loss of gloss occur. In addition, for the coating composition used in methods (2) and (3) above, it is not sufficient to simply focus on the functions of the compounding agents, and it is not enough to solve the above problems; Various considerations must be made regarding this.

Therefore, an object of the present invention is to provide a novel and good colored coating composition for cement tiles that can be applied to the methods (2) and (3) above.

As a result of various studies regarding the above points, the present inventors have developed a new colored coating composition for cement tiles that solves the above problems such as cracking and cracking by blending specific mortar, pigments, and waterproofing agents with cement. Heading J The present invention has been completed. That is, the present invention comprises (a) 100 parts by weight of cement, (b) 100 parts by weight of cement, 5 to 40 parts by weight of amorphous silica, and 55 to 170 parts by weight of fine sand.

Cellulose ethers, 1 to 0.6 parts NR.

100 to 200 parts by weight of mortar consisting of 4 to 17 parts by weight of ethylene vinyl acetate resin and 1,0.1 to 1.2 parts by weight of polyvinyl alcohol.

(C) Pigment 0.5-24 parts by weight (d) Waterproofing agent 0.2-2o parts by weight This is a colored coating composition for cement tiles consisting of:

The cement used in the present invention is generally ordinary Portland cement, but other materials such as fly ash cement, blast furnace cement, and white cement may also be used.

The mortar used in the present invention is the same cement 100 as mentioned above.
Parts by weight, amorphous silica 5 to 4 parts by weight, fine sand 55 to 1
70 parts by weight, cellulose x-7-ols 0.1 to 0.6
parts by weight, 4 to 17 parts by weight of an ethylene vinyl acetate resin, and 0.1 to 1.2 parts by weight of a polyvinyl alcohol resin. The mixing ratio of mortar with the above composition to cement is 1 part by weight per 100 parts by weight.
The amount is 0 to 200 parts by weight, preferably 50 to 150 parts by weight, and by maintaining this range, the strength and weather resistance are significantly improved. If the amount is less than the weight, the effect will be small, and if it exceeds the weight, the adhesiveness etc. will decrease and the object of the present invention will not be met.

The amorphous silica that makes up the mortar mentioned above is fly ash and ferrosilicon dust.

Examples include acid clay, kaolin, shirasu, diatomaceous earth, anti-flinder, and especially fly ash.

Silicon dust is preferably used in terms of workability and crack resistance. These amorphous silicas have a Blaine value of fineness of 1500 to 6000 cd/l, preferably 2
100 to 3000 d/f is used. The blending ratio of amorphous silica to cement is 5 to 40 parts by weight, preferably 10 to 20 parts by weight, based on 100 parts by weight of cement. In other ranges, workability may deteriorate,
Cracks are more likely to occur.

Sea sand is the fine sand used for mortar.

Any of natural sand such as river sand, silica sand, slag sand, and crushed sand such as fine limestone slag may be used, but silica sand is preferably used from the viewpoint of improving the durability of the mortar.

The particle size of the fine sand is preferably 0.8 cm or less, preferably 0.4 W or less, and preferably has a natural distribution and a spherical shape.

The mixing ratio of fine sand is 55 to 100 parts by weight of cement.
The amount is 170 parts by weight, preferably 70 to 100 parts by weight.

Examples of cellulose ethers include methylcellulose, ethylcellulose, flobyl methylcellulose, and hydroxyethylcellulose.

Ethers such as hydroxyflovir cellulose: Mixed ethers such as hydroxymethylethylcellulose and hydroxypropylmethylcellulose may be used alone or in combination of two or more.

Among these, mixed ethers are preferably used. Powdered cellulose ethers are generally used.

The blending ratio u of cellulose ethers is 0.1 to 0.6 parts by weight per 100 parts by weight of cement, preferably 15 to 15 parts by weight.
It is 0.3 parts by weight.

The ethylene vinyl acetate resin has an ethylene content of 10
~30% ethylene-vinyl acetate copolymer powder or emulsion, in addition to the ethylene and vinyl acetate components;
A ternary copolymer emulsion containing 10X or less of a third component such as acrylic acid is used, but a powdered ethylene vinyl acetate copolymer having an ethylene content of 12 to 20% by weight and a molecular weight of 6000 to 6000 is particularly preferred. used.

The blending ratio of ethylene vinyl acetate resin is 10 parts of cement.
4 to 17 parts by weight relative to 0 parts by weight, preferably 6 to 10 parts by weight
Parts by weight.

The polyvinyl alcohol resin can be used in either powder or liquid form as long as it is easily water-soluble, but a partially saponified product having a degree of polymerization of 1500 or more and a degree of saponification of 80 to 92% is preferred.

The blending ratio of polyvinyl alcohol is cement 100
The amount may be 0.1 to 1.2 parts by weight, and 0.2 to 0.8 parts by weight is particularly preferably used.

The pigment used in the present invention is mixed to color the surface of cement tiles, and the pigment is required to have good dispersibility and excellent alkali resistance, but both inorganic and organic types can be used. For example, synthetic iron oxide, red iron oxide.

There are chromium oxide, ultramarine, cement green, phthalocyanine blue, purple iron oxide, carbon black, etc., which can be selected as appropriate to obtain the desired color, but in general, inorganic ones are heat resistant and weather resistant. It is preferable because it has excellent properties. The blending ratio of the pigment to cement is 0.5 to 24 parts by weight, preferably 2 to 10 parts by weight per 1001 parts of cement. If the amount is too small outside this range, it will be impossible to obtain the desired coloring.
If the amount is too large, it may be difficult to disperse well in water, or the dispersibility during mixing may be poor.

Known waterproofing agents can be used without any restriction as to the waterproofing agent used in the present invention, but in general, calcium chloride, metal soap, fatty acids and lime, ammonium chloride, clay, boric acid, silicate, paraffin emulsion, metal stearate, etc. Salt-based emulsions and the like are used, and among them, paraffin-based emulsions and stearate metal salt-based ones are preferred because they have excellent stability such as crack resistance. The mixing ratio of the waterproofing agent is 0.2 to 20 parts by weight, preferably 1.5 to 3 parts by weight, per 100 parts by weight of cement. Outside the above range, the water repellency of the surface will be insufficient and the adhesion will decrease. The composition aimed at by the present invention cannot be obtained because it causes efflorescence and reduces watertightness.

Generally, the method for obtaining the coating composition of the present invention is to prepare a dry mortar in advance, mix cement, pigment, and waterproofing agent into the mortar, and knead while adding a predetermined amount of water. , each component in the mortar can be individually mixed with cement, pigment, and waterproofing agent. In this case, the cement content may be added at once, including the amount of cement in the mortar. When the above ingredients are used in liquid form, only the powder is mixed first, then the liquid ingredients are diluted with an appropriate amount of water, mixed, and then kneaded while adding water to a predetermined amount. . - If all ingredients are in powder form, mix each ingredient with cement and knead while adding a predetermined amount of water to obtain the appropriate softness.

In the colored coating composition of the present invention, the desired composition can be obtained by blending appropriate amounts of each of the above-mentioned ingredients, and even if one of the components is missing, the desired weather resistance 2 strength It cannot be a colored coating composition for cement tiles that has excellent properties. Similarly, in the present invention, the performance of the above-mentioned compounding agent is not substantially changed, and the dispersibility is improved.

Additives used to improve workability may be added.

The colored coating composition for cement tiles obtained as above is
It is applied to the surface of cement tiles using conventional methods such as spraying.

The cement tiles at this time may be in any state, from unhardened ones immediately after molding to those hardened by curing. Further, the thickness of the coating layer is generally about 0.5 to 1'X. The surface and side surfaces of the tiles coated by the above method are coated with a transparent paint uniformly as required, and then cured and cured. Curing methods include natural curing, steam curing, and water curing.

A known method such as autoclave curing may be used.

As described above, since the composition of the present invention is made by blending cement with a specific amount of various compounding agents, especially compounding agents including specific mortar, it can form a coating film with excellent adhesion and strength to cement roof tiles. , prevents cracking, efflorescence, etc., and is weather resistant.

It is excellent in preventing discoloration.

The present invention will be explained below based on examples, but the present invention is not particularly limited to the following examples. Similarly, the following Examples and Comparative Examples show the results according to the following test method.

(1) Method for measuring cracks A slurry made by mixing each raw material component and water based on JISR 52o1 is used as a concrete plate JISA 5334.
(Lid for reinforced concrete drawer mold) After applying 1 type 240KI% thick satay, 2DC.

A sample obtained by curing in air for one week at a relative humidity of 60% was subjected to a heat/water test using the cycle shown in FIG. Judgment was made by visually observing the number of cracks after 10 cycles and using the following criteria.

Number of cracks Judgment 0 ◎ 1 to 5 0 6 or more ・・・・・・ △ (2) Adhesion test A slurry made by mixing each raw material component and water based on JISR 5201 was applied to a concrete plate JISA-5334 (
Reinforced concrete drawer mold lid) Type 1 2401C1% (7
) The samples were cured in the air for 6 weeks at 20°C and relative humidity 60X after being applied to a thickness of Measure 5 points for each area, each with an adhesive area of 25 cd.
The adhesive force per unit area (Kf/d) was determined by dividing the adhesive force by , and the average value was displayed.

(3) Waterproof performance Housing and Urban Development Corporation cement filler standard.

Method of measuring water absorption rate (expressed by f/49d'I).

(4) Surface Hardness After preparing and curing the sample in the same manner as in the adhesive strength test, the surface was measured using a Mohs hardness meter.

(5) Presence of Nikka phenomenon Prepare the sample in the same way as the adhesive strength test, and immediately
Curing was performed for 24 hours at 0°C and humidity of 80±5X, and then left in a curing room at 5±2'C1 humidity of 50±5% for 24 hours or more, and the presence or absence of efflorescence was visually observed.

Example 1 Polyvinyl alcohol powder (saponification degree 80-921 polymerization degree 1500) 0.6 parts by weight, cellulose ethers 0.2 parts by weight, ethylene vinyl acetate copolymer powder (ethylene content 12-20% by weight 1 molecular weight 3000) ~6000
) and fly ash (910 parts by weight manufactured by Chugoku Electric Power Company) are mixed in an omni mixer for 4 to 5 minutes. Next, to this mixture is added 100 parts by weight of Portland cement (manufactured by Tokuyama Soda ■) and silica sand (particle size of 0.4 mm or less). 80 parts by weight of natural silica sand) was added and mixed for 5 minutes using a twin-screw mixer to form a dry mortar.

A sample obtained by mixing 100 parts by weight of cement with the above mortar, pigment, and waterproofing agent in the proportions shown in Table 1 was measured according to the test method described above.

The results are shown in the right column of Table 1.

Table 1 * Onoda N, N: Onoda Cement ■ Sho, Mu 3.5.
6 is a comparative example.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram illustrating a crack test method used in an embodiment of the present invention. Patent applicant Tokuyama Soda Co., Ltd.

Claims (1)

[Claims] 1) (a) 100 parts by weight of cement. (b) 100 parts by weight of cement, 5 to 4 parts of amorphous silica
0 parts by weight, 55-170 parts by weight of fine sand, 0.1-0.6 parts by weight of cellulose ethers, 4-17 parts by weight of ethylene vinyl acetate resin, and 0.1-1 parts by weight of polyvinyl alcohol.
10 to 200 parts by weight of mortar consisting of 2 parts by weight. (C) Pigment 0.5 to 24 parts by weight, 伎υ...(d)
Colored coating composition for cement tiles comprising 0.2 to 20 parts by weight of waterproofing agent