JPS5896662A - Refractory covering material composition - Google Patents

Abstract

PURPOSE:The titled composition having improved refractory and heat insulating properties, suppressing the rise in temperature of a steel frame in a fire, obtained by adding aluminum sulfate hydrate having a high content of water of crystallization, stable at a normal temperature, as a filler, to a base consisting of inorganic fibers and an inorganic binder. CONSTITUTION:For example, 100pts.wt. base consisting of inorganic fibers such as granular rock wool, etc. and an inorganic binder such as Portland cement, etc. is blended with 40pts.wt. aluminum sulfate hydrate, to give the desired composition. EFFECT:Capable of preventing reduction in strength of concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION The purpose of the present invention is to provide fire-resistant coating materials for buildings. It is an object of the present invention to provide a fireproof coating composition that can prevent a decrease in the strength of concrete.

Traditionally, fireproof coatings for buildings have been made of rock wool and cement as the main ingredients, with crosspieces or powdered filler added, but in order to achieve the legally mandated fireproofing performance, Usually 3G, ~60. It requires a thick coating, which poses problems such as construction time and design constraints.

In order to improve the heat permeability of fireproof coating materials, several attempts have been made to suppress the rise in steel frame temperature by adding substances containing water of crystallization and utilizing the decomposition endotherm during heating.
H) It is known to add ettringite and the like. However, all of these have a crystal water content of 35-45
In addition, the IJ Ngaite, etc.
Crystal water started to be released from a relatively low temperature of around 0C, and there was a problem that it could not be expected to sufficiently absorb heat effectively during fire heating.

Therefore, as a result of continuing research on more effective additives, we decided to use alum sulfate dime hydrate as an additive, which has a crystallization water content of about 50%, is stable at room temperature, and is easily available industrially. It was discovered that the material exhibits excellent heat resistance when used, and this invention was completed.That is, this invention uses inorganic fibers and an inorganic binder as base materials, and adds aluminum sulfate hydrate. It is a fireproof coating material composition characterized by the following, and if necessary, a setting retardant, a sizing agent, etc. may be added to improve lightweight aggregate and workability. Mori, rock wool, asbestos, etc. are used as inorganic fibers, and 4
1. Rock wool is preferred from a hygienic standpoint. As the inorganic binder, hydraulic substances such as Portland cement, gypsum hemihydrate, and calcium silicate are used, and gypsum hemihydrate and calcium silicate are particularly preferred. Aluminum sulfate hydrate is an industrial material called sulfate clay.

At, (804), denoted by n H,0 and s n =
The main component is that of Zfl. The amount added is 2~@owt*.

Preferably it is 20-40 wt-. Added amount is 2wt
% or less, there is no practical heat transmission effect, and 80 wt.
If it is 4 or more, the amount of inorganic fibers and inorganic binder to be blended will be too small and it will not be possible to maintain the mechanical properties required as a low-refractory coating material.

Embodiments of the present invention will be described below with reference to Examples.

Example 1 The basic raw material was granular rock wool to which ordinary bolt 27 cement was added as a binder, and to this, arsenium sulfate 18 hydrate and aluminum hydroxide were added at the compounding ratios shown in Table 1. , with and without ettringite added.

Add twice the amount of water to this amount of solids and mix.

This is H! 1! It was coated on the entire surface of the copper to a thickness of 1/4 inch and dried at room temperature for one month. Nire et al.'s test specimen was heated from all four sides in a furnace.
The surface temperature of the steel material after being heated for 1 hour using a hanger gas burner under the heating conditions of JIS A-1 4 is the value shown in the right column of Table 1.Aluminum sulfate 1 of this invention
Those with octahydrate added are of course aluminum hydroxide compared to those without additives.

The heat shielding effect was also lower than that of the one with ettringite added.

Table 1 In addition, when the composition in Table 1 to which aluminum sulfate 18 hydrate was added was applied to H-type steel to a thickness of 25 cm, the bare surface temperature of the steel material was 315 ° C. in the above test method. Even with a relatively thin coating thickness, it had the legally required fire resistance (350°C or less in the case of steel structural columns and frames).

Example 2 The basic raw material is a mixture of granular rock wool and asbestos with gypsum hemihydrate added as a binder. Sulfuric acid bread soil, respectively, with the mixing ratio shown in the table.

Added aluminum hydroxide, ettringite,
and one without additives are made, and 14 times the amount of water is added to each of these and mixed. This was coated on the entire surface of H-shaped steel to a thickness of 30 cm and dried at room temperature for one month.

The surface temperature of the steel material heated for 1 hour in the same manner as in Example 1 was the value shown in the right column of Table 2. This value is lower than that of the composition.

It showed heat transmission effect.

Table 2 Patent applicant: Asahi Kasei Industries, Ltd.

Claims (1)

[Claims] A fireproof coating material composition made of inorganic fibers and an inorganic binder as a base material, and containing aluminum 1-um sulfate hydrate.