JPS6363516B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a composition with excellent fireproof coating performance and good workability. BACKGROUND OF THE INVENTION As fireproof coating materials for buildings such as steel frames, spray coating of rock wool fibers via a bonding material and coating of calcium silicate plates are widely used. However, in the former case, the adhesion to the base structural material is poor and a lot of spraying pollution occurs, and the spraying work requires a lot of effort. The disadvantage is that the installation work to the base material is complicated, and in addition, a fairly sophisticated joining technique is required when installing on parts with complex shapes, so the fireproof coating performance of the completed board is not always uniform. The present inventors first completed the improvement by using inorganic fibers and a specific wet composite bonding material when covering base materials such as steel frames. By selecting and using rock wool processed into granules, it was confirmed that the heat insulation properties and workability were further improved, and the above-mentioned drawbacks were solved and succeeded. That is, the present invention provides (a) water-soluble alkali silicates, (b) (i) cement, zinc oxide, silica dust, (ii) divalent or higher metal salts of higher fatty acids, and water-soluble high Bivalent or higher valent metal salts of molecular substances, acidic metal oxides, phosphates, divalent metal sulfites, borates,
and (iii) at least one hardening component of component (a) above selected from metal powders, (c) inorganic lightweight aggregate, (d)
It consists of granular rock wool and (e) water, and the blending ratio is 5 to 250 parts by weight in the case of (i) of component (b) to 100 parts by weight of solid content of component (a), (ii) ) in case of 5~
30 parts by weight, 10 to 200 parts by weight in case of (iii) and (i) to (iii)
In the case of a combination of 5 to 250 parts by weight, component (c) is 30 to 200 parts by weight, and component (d) is 20 to 300 parts by weight, By mixing it as an essential component and operating it according to the construction method detailed below, it is possible to obtain an inorganic, highly fire-resistant and heat-insulating coating layer on base materials such as steel frames and structural wood through extremely easy operations. . Next, each essential component of the fireproof coating composition of the present invention will be briefly described. In the present invention, a water-soluble alkali silicate is used as the component (a), and only then can the desired composition be obtained. Examples of alkaline components constituting component (a) include Li,
Alkali metals such as Na, K, Pb and quaternary ammonium can be exemplified, and they can be advantageously used alone or in combination of two or more in the form of powder or aqueous solution, but paste preparation Considering the ease of construction, it is preferable to set the solid content concentration immediately before construction to about 10 to 60%. In addition, the hardening component of the water-soluble alkali silicate (component (b)) can be hardened by cement such as Portland cement, alumina cement, lime, high sulfate cement, silicon or silicon alloy by zinc oxide electric heating or metal method. Group (i) refers to silica dust that is produced as a by-product during manufacturing, and includes zinc stearate,
Divalent or higher valent metal salts of higher fatty acids such as potassium stearate and magnesium palmitate, divalent or higher valent metal salts of water-soluble polymer substances having carboxyl groups such as aluminum alginate and barium polyacrylate, Cr ₂ O ₃ , Acidic metal oxides such as Mn ₃ O ₄ and PbO, phosphates such as aluminum phosphate, calcium phosphate, and manganese phosphate, sulfites of divalent metals such as magnesium sulfite and zinc sulfite, lead borate, magnesium borate, etc. The borate of (ii)
as a group, and further Ti, Zr, V, Al, Si, Ge,
Metal powders such as Zn are classified as group (iii), and these (i)
It is preferable to use the curable components in groups (iii) in the form of powder, and one type of these can be used alone or two or more types can be used in combination. Furthermore, examples of the inorganic lightweight aggregate used as component (c) include vermiculite, expanded shale, perlite, expanded silica, and silica balloons. Furthermore, the granular rock wool used as component (d) refers to rock wool fibers that are mainly mechanically processed by adding rock wool fibers alone or other types of short fibers or powder, or by adding a very small amount of rock wool fibers. Rock wool that has been processed into granules via a binding substance, and the rock wool that has been processed into granules is not dispersed in the form of fibers in the composition of the present invention, so it retains a considerable amount of the fire resistance and heat insulation properties of rock wool alone. It is estimated that the particle size is preferably about 2 to 20 mm in diameter, and it is easy to disperse in order to maintain a granular shape. In addition to these essential ingredients, dispersion-stable fillers such as zeolite, talc, mica, and palygorskite, foaming agents for mortar, inorganic swelling substances such as kaolin, bentonite, and white carbon, and materials that do not significantly affect fire resistance. Water-soluble resins, organic granular foams, etc. can be blended to a certain degree. The fireproof and heat insulating composition of the present invention is generally based on the following blending ratio. That is, if the amount of component (b), that is, the curable component of component (a), is too small relative to 100 parts by weight of the solid content of component (a), regardless of whether it is any of (i) to (iii), the composition The fluidity of the compound decreases, which tends to cause problems such as drop-off and uncured, decreased water resistance of the fireproof coating layer, and poor adhesion.On the other hand, if it is added in excess, excess components that do not contribute to the curing reaction will harden. It tends to remain in the subsequent system and deteriorate the fire resistance, water resistance, and other functions of the fire-resistant coating layer. Next, component (c) reduces the specific gravity of the coating layer obtained by the composition and contributes to improving the heat insulation properties at room temperature or high temperature, but if the amount blended is small, it will naturally not be able to achieve this function. On the other hand, if the amount is too large, the fluidity of the paste will be poor, resulting in poor adhesion and reduced fire resistance.Furthermore, component (d) improves the mechanical strength of the composition, especially preventing shrinkage of the coating layer during drying and improving adhesion. It plays an extremely important role in improving heat insulation, fire resistance, etc., especially in the composite state of each component, and when it is low, fire resistance and heat insulation properties decrease and work On the other hand, if excessively blended, fluidity and water resistance tend to decrease, and the coating layer becomes non-uniform, which is undesirable. The composition for fireproof coating of the present invention prepared in this manner varies somewhat depending on the actual blending ratio, blending method, construction method, etc., but substantially has a bulk specific gravity of 0.3 after coating and drying. By setting the value to about 1.0, fire resistance, heat insulation, mechanical strength, etc. become preferable for the purposes of the present invention. It is presumed that this is not simply a matter of bulk specific gravity, but is due to the formation of a properly prepared composite from the moisture content, adhesion performance, heat conduction path, etc. When forming a fireproof coating layer on steel frames, metal plates, wooden structural materials, etc. using the composition of the present invention, the composition can be made into a paste form instantly or by mixing with a conventional mixer, and of course, the composition can be made into a paste form. Since it is water-based, it can be diluted with water, and after adjusting the viscosity with additives or adding water at the time of construction, it can be applied to the specified area by troweling, spatula, spraying, injection, etc. Coat the base material. The present invention will be specifically described below with reference to Examples and Comparative Examples. Example A coating composition of the present invention was prepared according to the ingredients and amounts listed in Table 1, water was added to the composition to adjust the viscosity, and the composition was quickly dried using a trowel so that the coating layer thickness after drying was approximately 20.
It was applied onto a 3.2 mm thick iron plate so that the thickness was 3.2 mm.
(Samples Nos. 1 to 8) Incidentally, talc, gypsum, and CMC were blended in advance with rock wool fibers, and this was placed in a mortar mixer and stirred to obtain granular rock wool. Using these dried specimens, a performance test was conducted according to the test method described below, and the results shown in the lower row of Table 1 were obtained. (a) Trowel workability: Comparative judgment based on trowel handling properties and the thickness that can be applied with one trowel application (the thicker the better). Evaluation by ◎＞〇＞△＞×. (b) Spraying workability: Judging by whether or not there are any droplets when sprayed to a thickness of 10 mm after curing. Evaluation by ◎＞〇＞△＞×. (c) Water resistance...Discoloration, cracking, etc. after immersion in water for 96 hours.
Check for changes such as peeling. (d) Adhesion...according to JIS A6909 5.5 (Unit: Kg
f/cm ² ) (E) Adhesion after immersion in water...Adhesion after immersion in water for 48 hours (unit: Kgf/cm ² ) (F) Back side temperature after heating...After heating for 90 minutes according to ISO834 Temperature on the back surface of the specimen (unit: °C) Comparative example Sample No. 1 in the example with the granular rock wool removed (sample No. 9), sample No. 4 with the vermiculite removed (sample
When the same test as in Example was conducted on Sample No. 10) and Sample No. 2 in which the granular rock wool was replaced with glass fiber strands (Sample No. 11), the results shown in Table 1 were obtained.

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Claims (1)

[Scope of Claims] 1 (a) water-soluble alkali silicate, (b)(i) cement, zinc oxide, silica dust, (ii) divalent or higher valent metal salt of higher fatty acid, water-soluble having a carboxyl group At least one selected from divalent or higher valent metal salts of polymeric substances, acidic metal oxides, phosphates, sulfites and borates of divalent metals, and (iii) metal powder; (c) inorganic lightweight bone. (d) granular rock wool (e) water, and the blending ratio is 5 to 250 parts by weight for component (b) (i) based on 100 parts by weight of the solid content of component (a). , 5 to 30 parts by weight in case of (ii), 10 to 30 parts by weight in case of (iii)
200 parts by weight, 5 to 250 parts by weight if (i) to (iii) are used in combination, 30 to 200 parts by weight of component (c) and 20 to 300 parts by weight of component (d). Composition for use.