JPH05156255A - Fireproof and fire-resistant putty - Google Patents

Abstract

PURPOSE:To obtain a fireproof and fire-resistant putty, containing silicon- containing polyvinyl alcohol, inorganic fiber, an endothermic decomposition type inorganic filler and frit in a specific proportion, excellent in fireproof properties, fire resistance, application properties, etc., and good as incombustible building materials. CONSTITUTION:The objective putty containing (A) 10-20wt.% silicon-containing polyvinyl alcohol, (B) 10-25wt.% inorganic fiber such as potassium titanate fiber or alumina fiber, (C) 50-65wt.% endothermic decomposition type inorganic filler such as calcium hydroxide or calcium carbonate and (D) 5-15wt.% frit. This putty does not become thin without being reemulsified by rainwater, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof putty excellent in fireproofness and workability and suitable as a noncombustible building material.

[0002]

2. Description of the Related Art Conventionally, for repairing cracks on the inner and outer wall surfaces of cement-based buildings, rooftops and furnace wall surfaces, cement filler-based sealing materials in which inorganic filler is added to cement, emulsions such as acrylic resin, calcium carbonate, etc. A resin-based sealing material added with the inorganic filler is used.

[0003]

However, the cement filler-based sealing material may be cracked due to vibration such as an earthquake, and the resin-based sealing material may be cracked or fallen off due to burning of the resin component during a fire. There is a problem that the re-emulsification phenomenon occurs due to the water content during rainfall and resin thinning occurs. In these conventional sealing materials, it was necessary to perform V-cutting on the cracks and then to close the cracks in order to strengthen the fixation to the cracks.

[0004]

The above-mentioned problems are solved by the present invention: 10 to 20% by weight of silicon-containing polyvinyl alcohol, 10 to 25% by weight of inorganic fibers, 50 to 65% by weight of endothermic decomposition type inorganic filler in the total solid content of the present invention, The solution is a fireproof putty containing 5 to 15 wt% frit.

The silicon-containing polyvinyl alcohol used in the present invention is a so-called "boil-dissolving type polyvinyl alcohol" having a silanol group as shown in the following chemical formula 1 and soluble in boiling water. Unlike the emulsion such as acrylic resin which has been conventionally used, the silicon-containing polyvinyl alcohol does not contain an emulsifier and therefore does not re-emulsify due to rain after construction. Further, since the silanol group in the silicon-containing polyvinyl alcohol is chemically and strongly bonded to the inorganic fiber contained in the putty and the silica component of the endothermic decomposition type inorganic filler, the inorganic fiber and the endothermic decomposition type inorganic filler are entangled with each other. It adheres and forms a skeleton like a tower in the putty. Further, the silanol group in the silicon-containing polyvinyl alcohol chemically and firmly adheres to the sand (silica) in the mortar, so that the crack need not be V-cut. The silicon-containing polyvinyl alcohol in the putty is preferably 10 to 20% by weight based on the total solid content in terms of solid content. If it is less than 10% by weight, the putty becomes too hard and the sealing property is deteriorated and the workability is also deteriorated. When it exceeds 20% by weight, the measured value of "slump" of JIS A 5758 for sealing materials for construction may exceed the standard value of 3 mm due to low viscosity.

[0006]

[Chemical 1]

Examples of the inorganic fiber used in the present invention include potassium titanate fiber, alumina fiber, alumina-silica ceramic fiber, magnesia fiber, silicon carbide fiber, carbon fiber, rock wool, mineral wool and glass wool. These inorganic fibers are used alone or in combination.
The amount of the inorganic fiber used is preferably 10 to 25% by weight based on the total solid content. If the amount is less than 10% by weight, shrinkage may be large in a fire or the like and the particles may fall off from cracks. If the amount exceeds 25% by weight, uniform dispersion in the putty may be difficult and quality may be uneven.

As the endothermic decomposition-type inorganic filler used in the present invention, a crystal water releasing type endothermic decomposition type inorganic filler such as calcium hydroxide or aluminum hydroxide or a carbon dioxide gas releasing type endothermic decomposition type inorganic filler such as calcium carbonate is used. These endothermic decomposition type inorganic fillers are used alone or in combination.
The amount of the endothermic decomposition type inorganic filler used is preferably 50 to 65% by weight. The endothermic decomposition type inorganic filler causes an endothermic reaction when exposed to high temperature such as in case of fire. For example, aluminum hydroxide releases crystal water relatively easily at about 300 ° C. to cause an endothermic reaction, and calcium carbonate generates carbon dioxide gas from about 800 ° C. to cause an endothermic reaction.

It is considered that the frit used in the present invention has a function of preventing the inorganic fibers constituting the skeleton of the putty and the like or the endothermic decomposition type inorganic filler from being scattered by the hot air or the wind pressure generated at the time of fire. The frit softens and melts due to the high temperature at the time of fire and becomes viscous, and adheres the inorganic fibers and the endothermic decomposition type inorganic filler to each other to prevent them from being easily scattered by hot air or wind pressure. Therefore, there is no particular frit to be limited, but it is preferable that the yield point is 350 to 750 ° C., and the amount used is 5 because it needs to be softened and melted and become viscous in case of fire.
-15% by weight is preferred. If it is less than 5% by weight, it is insufficient to prevent the scattering of the inorganic fibers and the endothermic decomposition type inorganic filler, and if it exceeds 15% by weight, the frit melted due to the high temperature at the time of fire and the inorganic fibers and the endothermic decomposition type inorganic filler are discharged. It destroys the skeleton that forms. The above components are placed in a container and mixed by stirring with a mixer to obtain a highly viscous putty without spots.

[0010]

In the fireproof and putty of the present invention, the inorganic fiber and the endothermic decomposition type inorganic filler in the putty are firmly bonded to each other by the chemical bonding with the silicon-containing polyvinyl alcohol, so that the putty does not lose weight even during rainfall. In addition, since the silica components of mortar, concrete, blocks, and blast-cast concrete plates and the silanol groups of silicon-containing polyvinyl alcohol chemically bond to give strong adhesion, it is not necessary to perform primer treatment and V-cut cracks except in special cases. You don't even have to. Further, the frit contained in the putty softens and melts due to a high temperature during a fire and has an adhesive property, and has an excellent effect of preventing the inorganic fiber and the endothermic decomposition type inorganic filler from being scattered by a flame or wind pressure.

[0011]

【Example】

Examples 1 to 3 and Comparative Examples 1 and 2 First, silicon-containing polyvinyl alcohol was added to hot water (90 to 100 ° C.) from the composition components described in Examples 1 to 3 and Comparative Examples 1 and 2 of Table 1 below. As a 10% by weight aqueous solution (50 CPS, 25 ° C.), the rest of the ingredients were added to the composition ratio shown in Table 1, and the mixture was stirred and mixed with a small super mixer to obtain a uniform high viscosity (viscosity 30 to 450,000 CP).
S) putty was obtained. Each putty was tested for slump value, crack resistance by initial drying, impact resistance, and oxygen index, and the results are shown in Table 1.

Each test was conducted as follows. Slump value: According to JIS A 5758. Crack resistance by initial drying: JIS A 6909
by. Impact resistance: According to JIS A 6909. Oxygen index: According to JIS K 7201. Fire resistance: As shown in FIGS. 1 and 2, using a simple small vertical fire resistance test furnace prepared according to JIS A 1304, the thickness is 60 mm, the length is 1,000 mm, and the width is 1,000.
2 mm of cement panel 1 (hereinafter referred to as "panel") is applied to each joint 5 with a spatula or trowel on a joint 5 obtained by cutting 500 mm into a width of 5 mm from the upper part of the vertical center to a depth of about 5 mm as shown in FIG. And then air dry for 7 days, then 100 mm long, 100 mm wide on the back of the panel.
One of the two air-dry cedar boards 3 with a thickness of 15 mm is abutted across the joint 5 at a position of about 250 mm from the top of the panel, and the other one is about 750 mm from the top of the panel for comparison.
I was assigned to the position. Moreover, the thermocouple 4 was set with the contact position of each air-dried cedar board 3 as a temperature measurement point. The flame measures the temperature at the temperature measurement point when heated for 60 minutes from the front side of the panel along the heating standard curve based on the provisions of the Building Standard Act Enforcement Order Article 107 No. 1 and passes the standard of 260 ° C or less,
The case where the temperature exceeds 260 ° C. is regarded as a failure and is shown in Table 1. The failure of Comparative Example 1 is that the putty 2 was scattered by the wind pressure of the flame and the air-dried cedar board 3 was burned. The failure of Comparative Example 2 is that the skeleton-like skeleton mainly composed of the inorganic fibers and the endothermic decomposition-type inorganic filler collapses due to the sagging of the molten frit and the putty 2
Is flowing out from the joint, the flame passes through the joint, and the air-dried cedar board 3 is burned. About 7 from the top of the panel for comparison
The temperature at each of the temperature measurement points of the air-dry cedar board 3 abutting on the position of 50 mm was 200 ° C. or less.

[0013]

[Table 1]

[0014]

Industrial Applicability The fireproof putty of the present invention does not re-emulsify against rainwater or the like, so that it does not lose weight and is chemically compatible with joint mortar, concrete, blocks, and blast-cast concrete boards. Since it is firmly adhered to the frit, the joint V is not particularly cut, and the frit exerts an adhesive property against the flame and wind pressure at the time of fire, so that it has an excellent effect of not scattering.

[Brief description of drawings]

1 and 2 are explanatory views for explaining the measurement of the fire resistance of the fireproof putty of Examples and Comparative Examples of the present invention,

FIG. 1 is an explanatory view of a panel as viewed from the back side.

FIG. 2 is an explanatory view of the panel viewed from above.

[Explanation of symbols]

 1: Cement panel. 2: Putty. 3: Air-dried cedar board. 4: Thermocouple. 5: Joint 5.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location E04B 1/682 // C09K 3/10 Q 9159-4H

Claims (1)

[Claims] 1. Polyvinyl alcohol containing silicon in an amount of 10 to 20% by weight, inorganic fibers in an amount of 10 to 25% by weight, endothermic decomposition type inorganic filler in an amount of 50 to 65% by weight, and frit of 5 in total solid content.
A fireproof putty containing 15% by weight.