JPS6239627B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a road/floor paint using a composite binder consisting of organic and inorganic substances. Conventionally, various organic paints for the purpose of protecting or decorating roads and floors made of concrete and asphalt have been known, including acrylic resin, epoxy resin,
Since urethane resin and other synthetic resin binders form a continuous film on the surface of concrete or asphalt, they are not breathable, and when temperature changes or other atmospheric conditions change, water vapor, etc. generated from the ground or underground can be generated. The disadvantage is that the pressure causes these coatings to blister and peel off from the base. On the other hand, inorganic paints that use colloidal silica as a binder are also known, but such paints have low film strength, cracks, and poor water resistance, so they cannot be used on harsh surfaces such as roads or floors. There are no examples of it being used in such environments. As a result of intensive research in order to solve the above-mentioned drawbacks of the conventional technology and to obtain a paint suitable for painting roads and floors, the present inventor has developed a synthetic resin emulsion in a specific proportion as a paint binder (film forming agent). Using a paint containing colloidal silica and mixing it with a large amount of aggregate, pigments, etc. will improve breathability, as well as adhesion to the substrate, weather resistance, water resistance, abrasion resistance, and other coating strengths. The present invention was completed by discovering that it is possible to form an excellent coating film. That is, the present invention provides a road/floor coating composition comprising a film forming agent, aggregate, pigment, etc., and a synthetic resin emulsion containing 100 parts by weight (solid content) of the film forming agent and about 10 to 50 parts by weight. colloidal silica in a proportion (solid content), and the composition is characterized in that the aggregate is present in an amount of 400 to 800 parts by weight per 100 parts by weight of the mixture. To explain the present invention in detail, the synthetic resin emulsion used in the present invention may be one that has been used in conventionally known emulsion paints, such as:
Emulsions based on synthetic resins such as acrylic resins, acrylic-styrene resins, vinyl acetate-ethylene resins, and epoxy resins are preferred. The colloidal silica used in the present invention is one that has been used as a binder in conventionally known colloidal silica-based inorganic paints, such as Snowtex (Nissan Chemical), Cataloid (Catalyst Kasei), Ludtux (EI Dupont), and Cyton. (Monsanto Chemical Company), Nalcoog (National Aluminate Company), etc. It is an aqueous dispersion of silica with particles of approximately 1 to 100 millimicrons, stabilized in a medium by an alkali. has been done. Such colloidal silica forms a film that will never be dispersed in water upon removal or evaporation of the water medium. Such colloidal silica is used in a proportion of about 10 to 50 parts by weight per 100 parts by weight (solid content) of the synthetic resin emulsion. If the amount used is below the lower limit of this range, the breathability of the coating film aimed at by the present invention will not be obtained, and the surface hardness and abrasion resistance of the coating film will be insufficient.
If the amount used exceeds the upper limit of the above range, the elasticity of the coating film will be lost, and it will not be able to follow the expansion and contraction caused by the temperature of concrete or asphalt, causing cracks, etc.
The water resistance is very poor, making it unsatisfactory as a paint for roads and floors, and causing problems with peeling and durability. In the present invention, various aggregates, pigments, fillers, etc. are blended in arbitrary proportions in order to increase the hardness, strength, etc. of the coating film, and to color it. Examples of such aggregates include silica sand, silica powder, anhydrite, calcium carbonate, talc, silica earth, clay, glass fiber,
There are asbestos, walrus night, etc., and fillers such as various colored pigments and extender pigments are added. Such aggregate is preferably used in an amount of about 400 to 800 parts by weight per 100 parts by weight (solid content) of the film forming agent. If the amount of aggregate is too small, it will not only adversely affect the air permeability of the paint film, but also cause the paint film to shrink when drying, resulting in cracks in the paint film. This tendency is particularly noticeable when the base is asphalt. On the other hand, if the amount of aggregate is too large, the effect of the binder will be reduced and the strength of the coating film will be reduced. In the present invention, appropriate air permeability is maintained by further adding approximately 0.05 to 5 parts by weight of a silicone water repellent or liquid paraffin emulsion per 100 parts by weight (solid content) of the total film forming agent. It has been found that the water resistance of the coating film can be significantly improved while maintaining the coating composition. The method for producing the coating composition of the present invention comprising the above-mentioned components is in accordance with conventionally known methods. For example, the coating composition of the present invention can be obtained by uniformly mixing the above-mentioned components using various stirrers or dispersers, and filtering the mixture. When preparing the coating composition of the present invention, it is preferable to adjust the water content so that the final solids content of the coating composition is about 55 to 58% by weight. The coating composition of the present invention as described above is particularly useful as a road or floor coating. In other words, when the coating composition of the present invention is used on roads or floors, a strong, breathable film is formed, so even if water vapor is generated from the concrete or asphalt substrate, the water vapor will be transferred between the substrate and the coating. It does not accumulate between the coating and the coating and does not cause peeling of the coating. Furthermore, since these coating films have a certain degree of elasticity, they can follow the expansion and contraction of asphalt and the like due to temperature changes, and the coating does not develop cracks. Next, the present invention will be specifically explained with reference to Examples. Note that parts and percentages in the text are based on weight. Examples 1 to 3 and Comparative Examples 1 to 3 Paints having the compositions shown in Table 1 below were prepared by a conventional method.

[Table] The coating compositions of the present invention and comparative examples described above were applied to a concrete board (10 x 10 x 2 cm) at a rate of 800 g/m ² , and after drying for one day and night at room temperature, the cross-section of the painted board was When 1/2 was immersed in water at 40℃ for 3 days with the coating side facing up, the coating in Comparative Example 1 had blisters, and the coating in Comparative Example 2 had softened significantly. However, no change was observed in any of the products of the present invention.

Claims (1)

[Scope of Claims] 1. A road/floor coating composition comprising a film forming agent, an aggregate, a pigment, etc., in which the film forming agent contains 100%
It is a mixture consisting of a synthetic resin emulsion in a proportion by weight (solid content) of about 10 to 50 parts by weight (solid content) of colloidal silica, and the aggregate is 100 parts by weight (solid content) of the film forming agent mixture. 400-800 per
The above composition, characterized in that the proportions are parts by weight. 2. The composition according to claim 1, further comprising a water repellent.