JPH03218990A - Decorative method for cement secondary product - Google Patents

Abstract

PURPOSE:To perform decoration which is clear and free from fading based on efflorescence phenomena, etc., and excellent in chemicals resistance and weather resistance by mixing pigment with thermoplastic resin and melting the obtained powdery coating by flame and spraying this melt on the surface of a dry cement secondary product. CONSTITUTION:Powdery coating is produced by mixing pigment with thermoplastic resin such as fluororesin, vinyl chloride-based resin, PE, PP or acrylic resin. Then this powdery coating is melted by flame and this melt is sprayed on the surface of a dry cement secondary product. Thereby decoration is performed on the cement secondary product such as a pavement. Further the sliding resistance on the coated face is enhanced by thermally spraying the frictional material such as silica sand particles, ferroalloy particles, garnet particles, emery particles, slag particles in steel manufacture and alloy slag particles, etc., together with the powdery coating on the surface of the cement secondary product. Even when the road surface is wetted by rain, a pavement is coated so that walkers do not slide.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cosmetic method that can impart color to secondary cement products as well as impart weather resistance and abrasion resistance. Conventional technology The pavement of sidewalks and community roads in general is mainly made of asphalt and concrete, and other materials such as concrete slabs and interlocking blocks are also used. In addition, machi blocks and hollow blocks can be used to create stone walls and fences. However, from the viewpoint of aesthetics, these cements are mixed with pigments, colored cement, or colored aggregates are used in the upper layer for the purpose of imparting aesthetic appearance. ．． In addition, hollow broncs resembling granite are also used, albeit in a small number of cases. In order to give an aesthetic appearance to already made Funkrete products, water-based. Oil-based paint is brushed or sprayed onto the surface of the product. Problems to be Solved by the Invention However, in general, cement products suffer from the formation of calumium carbonate (CaCOs) due to the reaction of calcium ions contained in cement with carbon dioxide gas in the air, resulting in whitening of the surface (efflorescence phenomenon) and fading of color. It has the disadvantage of

Furthermore, when calcium ions are leached, black mold grows, which impairs the aesthetic appearance. Concrete products also have the disadvantage of having a high water absorption rate, which makes it difficult to remove dirt when sewage or oil seeps into them. If paint is brushed or sprayed onto a concrete surface, it will not adhere well to the concrete surface and water contained in the concrete will seep out. This has the disadvantage that the painted surface is likely to peel off and black mold is also likely to grow. SUMMARY OF THE INVENTION In view of the drawbacks of the prior art, it is an object of the present invention to provide a method for decorating secondary concrete products that has a strong contact force with the concrete surface and prevents the painted surface from peeling off. A means for solving the problem, that is, the present invention is a cement secondary product in which a powder coating made of a thermoplastic resin mixed with a pigment is sprayed on the surface of a dried cement secondary product in a state in which it is melted in a flame. This purpose is achieved by the cosmetic method of the following products. Another invention achieves this object by a method for decorating a secondary cement product, which involves spraying an artificial color aggregate on the surface of a dried secondary cement product along with a powder coating made of a mixture of thermoplastic resin and pigment. . Particle size of powder coating is 0
．． Use one with a rating of 0.05 to 0.21. As thermoplastic resins, we use polyethylene, vinyl chloride-based ballast, polypropylene, fluoride resin, 7-acrylic resin, etc., but materials that melt in flames and do not burn out even when opened for a certain period of time and exposed to flames are recommended. preferable. The pigment is preferably an inorganic pigment that does not change due to the heat of the flame, and in the case of an organic pigment, one with a relatively high melting point is used. The blending amount is preferably 10w% or less. Color aggregates include silica sand grains, ferroalloy grains, garnet grains, emery grains, steelmaking slag grains, and steelmaking slag. One or more types selected from alloy slag grains and alloy spherical slag are used. The particle size of the plaster is 0.5 to 2. 0! I
Use something about l1. Function: In the cosmetic method of the present invention, the concrete surface must first be dry, so it is allowed to dry by radiating flame or the like before applying the paint. Next, powder paint is sprayed onto the dry concrete surface by mixing pigment with thermoplastic resin powder while radiating flame onto the concrete surface. Then, the powder paint melted by the flame adheres to the surface of the funk notebook. Since the applied paint is initially in liquid form, it penetrates into the unevenness and cracks of the concrete surface and flattens the surface. Since pigments that do not melt are mixed in the resin, they become uniformly dispersed when the resin hardens. In addition, if silica sand grains, alloyed iron grains, etc. are mixed and sprayed, the aggregate itself will not be melted by the flame, so
Generally, it has a raised shape on the resin surface and can increase the coefficient of friction of the painted surface. Embodiments The present invention will be explained in detail below according to embodiments shown in the drawings. A paint consisting of Table 1 below was prepared, and the paint of the present invention was applied to the concrete surface with a nozzle to a thickness of ζo. Spray it so that it looks like the sun. The comparative example is brushed and has a thickness of 0.
．． It was painted to be 51110. All painted surfaces were flat, and the pigment was dispersed, giving them a uniform color. (Painting method) Powder paint is ejected from the center of a double-tube flame spray nozzle using compressed air, and gaseous fuel such as propane gas is burned from the surrounding area to melt the paint and apply it to the coating. Spray on the surface.

The air ejection rate is 120-130 N/min, the distance between the nozzle and the concrete surface is about 15-20 cm, and the flame temperature is 800-1.500°C.

Accelerated yellowness test, accelerated weather resistance test, alkali resistance test, softening point test, shear resistance test and peelability test were conducted on these painted surfaces, and the results were as shown in Table 2 and Table 5. (Test method) Length 300nwn x Width 300m++ x Thickness 601a 57
) (7) Tests were conducted on each coated surface. JIS K 5400 This was a test to determine the yellowing of the white paint film due to an accelerated test. The color tristimulus value (
X, Y. Calculated from Z) and expressed in yellowness. Softening test (JIS K 5665): Fill the molten sample into a brass material filling ring (20 mm diameter). After curing, place the filled ring into a container containing glycerin. Place a steel ball in the center of the filling ring and raise the temperature of the glycerin.
The temperature at which the resin gradually softened and the steel balls fell from the filled ring was measured and determined as the softening point. Slip resistance test (ASIM E 303-69)
The slip resistance of the block surface is measured by using a British-made pendulum portable tester, rubbing the surface with a rubber slider attached to the end of the pendulum, and calculating the friction resistance as the slip resistance value (B.P.N.). It was expressed as Tests were conducted on dry and wet surfaces. Peeling test The strength of the adhesion between the block surface and the paint film was measured using a Kenken type adhesion tester with a test area of 6 x 9 cm, 54 cm.Table 5 Peelability test results A paint according to Table 6 below was prepared, and the paint of the present invention was thermally sprayed onto the concrete surface using a nozzle according to the method described in Example 1 to a thickness of 0.smm.
The water-based paint of Example-1 adopted as a comparative example was applied with a brush to a thickness of 1. It was painted to look like the sun. Accelerated weather resistance tests and alkali resistance tests were conducted on these painted surfaces, and the results were as shown in Table 7.8. (Test method) Tue] 11 ag! (JIS K 5400) Using an ultraviolet carbon arc lamp type weather resistance tester, the test specimen is irradiated with light from the carbon arc lamp and sprayed with water mist at regular intervals to detect discoloration, loss of gloss, and wrinkles in the paint film. ．． Blistering and peeling were observed. We also examined the degree of chalking by touching the paint film with our fingertips. Alkalinity test (JIS K 5400) The test specimen was immersed in a saturated calcium hydroxide solution for 18 hours, and the deterioration of the coating film was observed. I. If no peeling, pitting, or softening is observed, it is considered that there is no abnormality. Furthermore, compared to conventional painting methods that use solvents, the paint solidifies as it cools, resulting in a faster finish. Accelerated weathering test results table-8 Effects As mentioned above, according to the cosmetic method of the present invention, the colors are as vivid as in the conventional painting method, and the whiteness that occurs in the conventional painting method is eliminated. It does not fade due to flowering and has excellent chemical resistance, so it can maintain its beautiful appearance for a long time.

Additionally, paints with friction materials such as silica sand added to them as solvents can improve the slip resistance of the painted surface, so even if the road surface gets wet due to rain, you can rest assured that pedestrians will not be scratched. Able to walk.

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Claims (3)

[Claims] (1) A cosmetic method for a secondary cement product, which comprises spraying a powder coating made of a mixture of a thermoplastic resin and a pigment onto the surface of a dried secondary cement product in a molten state using a flame. (2) The method for decorating a secondary cement product according to claim 1, wherein the thermoplastic resin is a fluororesin, a vinyl chloride resin, polyethylene, polypropylene, or an acrylic resin. (3) A type selected from silica sand grains, iron alloy grains, garnet grains, emery grains, steelmaking slag grains, steelmaking spherical slag, alloy slag grains, alloy spherical slag or A cosmetic method for secondary cement products, characterized by spraying two or more types of artificially colored aggregates.