JPH0699177B2 - Fireproof coating - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fireproof coating material used for spraying on a pillar, beam, wall, etc. of a building.

[Conventional technology]

Pillars of buildings, beams, and wet-spraying methods of spraying on walls by coating the kneading paste material have been used for a long time with coating materials of the main composition using cement as an adhesive and asbestos as a fiber reinforcement. Recently, as asbestos pollution has become a problem, material conversion is being promoted by replacing the fiber reinforcement with other active ingredients.

The most typical afbest alternative material is rock wool, and a wet spray material for forming a fire resistant coating having a composition of a hydraulic inorganic adhesive, a surfactant and a thickening agent has already been disclosed in JP-B-54.
-29537 gazette. However, rock wool has a poor entanglement property as compared with asbestos, and has a drawback that the interlayer strength of the formed coating layer is low. In order to solve this drawback, a wet spray material having a composition in which a fibrous hydrous magnesium silicate such as sepiolite is further added to the above components has been proposed (JP-A-63-297256).

[Problems to be Solved by the Invention]

That is, the wet spray material described in JP-A-63-297256 has a rock wool and a hydraulic inorganic adhesive as a main material, and a thickener, a surfactant and water are added thereto and kneaded to obtain a viscous material. In a wet spray material for forming a refractory coating containing no asbestos in the form of a paste, the spray material further contains 0.5 to 10% by weight of fibrous hydrous magnesium silicate per total solid content. However, even in this compounded composition, there is a problem that the entangleability due to the fiber component is not sufficient and the strength characteristics are not sufficiently improved.

It is an object of the present invention to provide a fireproof coating material having a composition excellent in strength characteristics, which is an improvement over the above-mentioned prior art.

[Means for Solving the Problems]

The fire-resistant coating material according to the present invention for achieving the above-mentioned object, Portland cement, fly ash and rock wool as a main component, in a paste material obtained by blending a lubricant, a thickener, a swelling agent and water thereto, The composition is characterized by containing 2 to 4% by weight of sepiolite and 0.1 to 0.4% by weight of glass fiber based on the total solid content.

The fire-resistant coating material of the present invention is composed mainly of normal Portland cement, rock ash as a filler and fly ash as an extender, and a kneading agent such as a lubricant, a thickener, and a swelling agent together with water. The composition is assumed to be a paste material that can be wet sprayed.

As the lubricant, attapulgite having a chemical formula of Si ₈ O ₂₀ Mg (OH) ₂ (OH ₂ ) ₄ 4H ₂ O is preferably used. This ingredient is
It excels in pumpability as compared to commonly used kaolin. Methylcellulose is an effective substance for the thickener. Further, as a swelling agent, a calcium sulphoaluminate type is preferably used, and it functions to relieve the shrinkage rate of the material.

The present invention provides a paste material comprising the above-mentioned components, which comprises 2 to 4% by weight of sepiolite and 0.1 to 0.4% by weight based on the total solid content.
The point of composition is that it contains glass fiber in an amount of wt%.

Sepiolite is a magnesium silicate-based fibrous mineral,
In particular, those obtained by refining and adjusting the fiber length are preferably applied. The reason why the content of sepiolite is limited to 2 to 4% by weight based on the total solid content is that when the content is less than 2% by weight, the effect of improving the entanglement property and the water retention is not produced, and when the content exceeds 4% by weight, the drying shrinkage is reduced. This is because it becomes large and does not contribute to the improvement of the effect.

As the glass fiber, chopped fiber cut into an appropriate length is used. The longer the fiber length and the larger the amount of the mixture, the greater the reinforcing effect. However, the fiber length is 15
If it exceeds 10 mm, the fluidity of the material becomes extremely poor, causing the phenomenon of entanglement or pills on the stirring blades and valves of the pump, while if it is less than 10 mm, the reinforcing property deteriorates. Therefore, it is preferable that the length is 10 to 15 mm.

Further, if the content of glass fiber is less than 0.1% by weight based on the total solid content, the entanglement property is deteriorated and the reinforcing effect is not sufficiently exerted, and if it exceeds 0.4% by weight, the fluidity of the material is impaired. Invite. Therefore, the total solid content is 0.1 to 0.4.
Set in the range of weight%.

[Action]

According to the fire-resistant coating material of the present invention having the above composition, the sepiolite and the glass fiber in the specific range contained relative to the total solid content synergistically enhance the strength by entanglement of the paste components and improve the water retention effect. It brings about an improvement in physical properties equivalent to or better than conventional asbestos. In particular, the combined use of glass fibers has the function of significantly increasing the entanglement with the lath when spraying the lath base used for wall materials and the like.

Through such an action, a high-strength fire-resistant coated surface free from defects such as sagging, flaking, and cracks is always formed with good workability.

〔Example〕

 Hereinafter, examples of the present invention will be described in comparison with comparative examples.

Example 1 Various material components were blended in the weight ratios shown in Table 1 to prepare 1.
A paste was formed by kneading in a mixer with twice the amount of water.

When the physical properties of the fire-resistant coating material having the above composition were measured, it was confirmed that the coating performance was good as shown in Tables 2 and 3.

Comparative Example The composition materials having the components and the compounding ratios in Table 4 were made into a paste in the same manner as in the example to form a fireproof coating material.

The physical properties of the above fire-resistant coating materials are shown in Table 5, and the strength properties were inferior to the materials shown in the examples.

Example 2 Among the components shown in Table 1 of Example 1, a paste was formed by changing the composition of sepiolite to 1% by weight, 2% by weight and 4% by weight.

The physical properties and properties of this fire resistant coating material are shown in Table 6.

From the results in Table 6, the mixing ratio of sepiolite is 2 to 4% by weight.
It is preferable that 1% by weight does not give good quality characteristics.

The mortar prepared by the formulation of the above example was generally applied to a lath which is used as a refractory coating and a base of a partition wall, and aged in air to observe the rust generation state, but no rust generation was observed.

For the purpose of the fireproof coating, steel or lath is used as the base material.

The lath has a small wire diameter for each mesh, so be careful about rust. Further, it is desirable that rust does not occur even in steel materials.

As described above, according to the present invention, a partition wall having high strength can be constructed in combination with good entanglement with a lath.

〔The invention's effect〕

As described above, the refractory coating material of the present invention exhibits the same or higher performance as the composition containing the asbestos, which does not contain any harmful component asbestos.

Therefore, a strong and durable coating layer can be formed by spraying on the outer wall of various structures.

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display area // (C04B 28/04 18:08 B 2102-4G 14:46 2102-4G 14:10 B 2102-4G 22 : 14 D 2102-4G 24:38 B 2102-4G 14:42) C 2102-4G (72) Inventor Kiichiro Muta 2-19-1 Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (72) Invention Osamu Masuzawa 2-8-10 Sakae-cho, Kawaguchi City, Saitama 5-402 Citrus 5-402 (72) Inventor Masami Shirato 1850 Ohkuno, Hinode-cho, Nishitama-gun, Tokyo (56) Reference JP-A-1-278439 (JP, A) JP 62-3083 (JP, A) JP 54-160020 (JP, A)

Claims (3)

[Claims] 1. Portland cement, fly ash, and rock wool as main components, to which a lubricant, thickener,
In a paste material containing a swelling agent and water,
2-4% by weight of total solids of sepiolite and 0.1
A fire-resistant coating material having a composition characterized by containing ˜0.4% by weight of glass fiber. 2. The fireproof coating material according to claim 1, wherein attapulgite is used as the lubricant. 3. The fire-resistant coating material according to claim 1, wherein a calcium sulphoaluminate-based component is used as the expanding agent.