JP3128514B2 - Thermosetting pouring material for gutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermosetting pouring material for gutters, which has high corrosion resistance as a lining material for blast furnace gutters, improves the working environment and saves labor in construction.

[0002]

2. Description of the Related Art As a casting material for a gutter, a powder material using alumina cement as a hardening agent is carried into a construction site.
It is common practice to add water, knead the mixture using a large mixer and pour it. For this reason, large-scale equipment such as a mixer for kneading is required, and dust and the like are generated during kneading, so that labor saving of the construction cannot be said to be sufficient, which is not preferable in terms of working environment.

[0003] Therefore, recently, Japanese Patent Publication No. 6-53617,
JP-A-4-331775, JP-B-6-94392 and JP-A-6-48845 have been proposed. For example, Japanese Patent Publication No. 6-53617 discloses that 100 parts by weight of a refractory aggregate contains 5 parts by weight or more of a refractory fine powder of 0.3 mm to 10 μm, and an ultrafine refractory powder having an average particle diameter of 10 μm or less. 8
To 20 parts by weight, and the total amount of the refractory fine powder and the refractory ultrafine powder is 25 parts by weight or more. There is disclosed a thermosetting gutter casting material comprising 0.1 to 2.0 parts by weight of the adjusted sodium silicate glass and a predetermined amount of water.

Japanese Unexamined Patent Publication (Kokai) No. 4-331775 discloses a refractory aggregate having a controlled particle size and 0.074 as a binder.
Sodium silicate glass particles having a particle size adjusted to 2.00 mm, and the surface of the sodium silicate glass particles has a softening point of 40 to
There is disclosed a thermosetting pouring material characterized by containing, as an essential component, a coating of paraffin at 80 ° C. in a weight ratio of sodium silicate glass / paraffin of 2 to 10.

Further, Japanese Patent Publication No. Hei 6-94392 discloses that a synthetic resin emulsion as a heat-sensitive binder is used in a solid content of 0.1 to 100 parts by weight of the refractory aggregate whose particle size is adjusted.
5.0 parts by weight and an alkylphenol-formalin condensate alkylene oxide adduct and / or a polysiloxane-based alkylene oxide adduct as a heat-sensitive gelling agent are added in an amount of 1.0 to 1.0 part by weight based on 100 parts by weight of the solid content of the synthetic resin emulsion. A thermosetting amorphous refractory characterized by adding 50.0 parts by weight is disclosed.

JP-A-6-48845 discloses that 0.0% of phosphate glass and / or oxycarboxylate is used as a binder in 100% by weight of refractory aggregate powder whose particle size has been adjusted.
An amorphous refractory material characterized by adding 5 to 5% by weight and 0.01 to 1% by weight of a thickener and then kneading with water or another kneading liquid is disclosed.

[0007] The irregular-shaped refractory described in the above-mentioned publication is brought into a construction site with a kneaded material to which a thermosetting binder is added for the purpose of labor saving of construction, improvement of working environment, and improvement of corrosion resistance and heat resistance. It was directly introduced into the gutter and cured by heating and curing, thereby eliminating the need for a large mixer for kneading and eliminating dust during kneading.

[0008]

However, the construction of the conventional casting material and the irregular-shaped refractory described in the above publication are
In general, the vibration is performed by using a vibrator or a rod-shaped vibrator installed in a construction frame. This vibration degass the air bubbles in the material and fills the construction site while imparting fluidity to the material, and promotes the densification of the material by degassing, exhibiting the strength and corrosion resistance inherent to the material It is intended for casting and is indispensable for pouring work.

However, the installation of the vibrator in the construction frame increases the equipment cost and deteriorates the working environment due to the noise during the vibration, while the use of the rod-shaped vibrator increases the number of workers and the physical burden on the workers. Bring. In addition, in a part where the construction thickness is thick, sufficient vibration is not transmitted to the material by frame vibration, and in a part where the construction thickness is thin,
There are problems such as difficulty in inserting a rod-shaped vibrator.

One of the features of the thermosetting pouring material is that it can be stored as a kneaded material because it does not cure at room temperature. However, when a casting material having extremely excellent fluidity is stored as a kneaded material, particle size segregation and separation of a liquid phase are likely to occur, and the fluidity decreases.

Accordingly, an object of the present invention is to provide a thermosetting pouring material for a gutter which can be applied even in a non-vibration state, has high strength and high corrosion resistance, and has excellent self-flowability. .

[0012]

Means for Solving the Problems The present inventors have conducted intensive studies in order to solve the above-mentioned problems, and as a result, by applying a specific particle size composition, the excellent self-flowability of the kneaded material has been improved.
The present inventors have found that the thermosetting pouring material is not damaged when stored, and have completed the present invention.

That is, the thermosetting pouring material for a gutter of the present invention comprises a refractory aggregate, fine powder and a thermosetting binder.
Thermosetting binder is not suitable for thermosetting pouring materials for gutters.
Thermal synthetic resin emulsion and / or thermosensitive gelling agent
The addition and blending amount of the thermosetting binder is
0.05 to 5% by weight based on the total amount of the powder,
Cement JIS cone containing 20 to 30% by weight of fine powder having a particle size of 45 μm or less, a weight ratio of fine powder having a particle size of 20 to 45 μm / fine powder having a particle size of less than 20 μm is 1.0 or less, and immediately after kneading and 14 days after kneading. A flow value after one minute without vibration using (JIS R2521) is 160 mm or more.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The first feature of the thermosetting pouring material for gutters of the present invention is that fine powder having a particle size of 45 μm or less is used for 20 to 30 minutes.
Fine powder containing 20% by weight and having a particle size of 20 to 45 μm / particle size 20
The weight ratio of the fine powder having a size of less than μm is 1.0 or less. Here, a thermosetting pouring material for gutters having less than 20% by weight of fine powder having a particle diameter of 45 μm or less is not preferable because of insufficient flow of powder immediately after kneading due to insufficient fine powder.
The thermosetting pouring material for gutters, in which fine powder having a particle size of 45 μm or less exceeds 30% by weight, is inferior in fluidity due to particle size segregation after storage for 14 days after kneading.

Further, a fine powder having a particle size of 45 μm or less
Even a thermosetting casting material containing 0% by weight has a particle size of 20%.
A powder having a weight ratio of fine powder of .about.45 .mu.m / fine powder having a particle size of less than 20 .mu.m exceeding 1.0 causes separation of the liquid phase and is inferior in fluidity after storage for 14 days after kneading, which is not preferable.

Further, a second feature of the thermosetting pouring material for gutters of the present invention is that the thermosetting pouring material for gutters immediately after kneading and after storage for 14 days after kneading is a cement JIS cone.
The flow value after one minute without vibration using (JIS R2521) is 160 mm or more. A flow value immediately after kneading and after storage for 14 days after kneading is less than 160 mm, which is not preferable because it is difficult to perform vibration-free construction at a construction site.

That is, fine powder having a particle size of 45 μm or less
Fine powder containing 0% by weight and having a particle size of 20 to 45 μm / particle size 2
The weight ratio of the fine powder having a particle size of less than 0 μm is 1.0 or less;
Immediately after kneading and after storage for 14 days after kneading, the flow value after 1 minute without vibration using a cement JIS cone was 160 mm.
The thermosetting pouring material for gutters of the present invention, characterized by the above, maintains excellent self-fluidity even after storage for 14 days after kneading, and is capable of vibration-free construction.
A dense construction body can be obtained. In addition, since it is dense even in non-vibration construction, a construction having high strength and high corrosion resistance can be obtained.

The refractory aggregate and fine powder constituting the thermosetting pouring material for gutters of the present invention include fused alumina, sintered alumina, calcined alumina, bauxite, kyanite, and the like.
Mullite, rhoite, silica, fused spinel, sintered spinel, fused magnesia, sintered magnesia, zircon, zirconia, silicon carbide, silicon iron nitride, silicon, ferrosilicon, aluminum, boron carbide, graphite, amorphous carbon, One or more selected from the group consisting of pitch, clay, bentonite, hydrous amorphous silica, anhydrous amorphous silica, and the like can be used.

Further, as a binder, no curability at ordinary temperature, thermosetting binder you cured by heating, for example, seeds <br/>'s synthetic resin emulsion, a heat-sensitive gelling agent, etc. can be used Oh Ru. Admixing amount in the name you, the binder is 0.05 to 5 wt% outside hanging against the refractory aggregate and the total amount of fines, preferably in the range of 0.1 to 3 wt%. Here, if the amount of the binder is less than 0.05% by weight, there is no effect as a binder, and if it exceeds 5% by weight, the permeability of the kneaded material is reduced, and the swelling and cracking of the construction body during heating and curing. This is not preferred because it is likely to cause cracks.

Further, the thermosetting casting material for a gutter of the present invention may use a thickener to prevent uneven distribution of particle size and liquid phase separation during transportation of the kneaded material. As a thickener,
For example, cellulose-based organic compounds such as methylcellulose, and various copolymers obtained from styrene, isopropylene, ethylene, methacrylate, acrylate, and the like, and multi-component copolymers such as unsaturated carboxylic acids and / or dicarboxylic acids. Synthetic emulsions can be used. The amount of the thickener added / blended is 0.01 to 2% by weight, preferably 0.1 to 1% by weight, based on the total amount of the refractory aggregate and the fine powder. If the amount of the thickener is less than 0.01% by weight, the effect of preventing separation of the liquid phase is not preferred, and if it exceeds 2% by weight, the fluidity is reduced and poor curing is caused. It is not preferable because it is easy.

The thermosetting pouring material for a gutter of the present invention may contain a dispersant used for a normal pouring material, if necessary. As the dispersant, for example, one or more of alkali metal phosphate, alkali metal carboxylate, alkali metal humate, sodium polycarboxylate, and the like, and a substance having the same effect as those described above are used. be able to. The amount of the dispersant added / blended is 0.01 to 1% by weight based on the total amount of the refractory aggregate and the fine powder.
If the amount of the dispersant added / blended is less than 0.01% by weight, the dispersant will not be cured, and if it exceeds 0.5% by weight, the fluidity tends to be lowered, which is not preferable.

Further, the thermosetting pouring material for a gutter of the present invention is added with water by water or water and a synthetic resin emulsion during kneading. In this case, the amount of added water is up to about 8% by weight based on the total amount of the refractory aggregate and the fine powder. If the amount of water added exceeds 8% by weight, the liquid phase is easily separated during storage of the kneaded material, and the fluidity is undesirably reduced.

[0023]

EXAMPLES The thermosetting pouring material for gutters of the present invention will be further described below with reference to examples. Example A kneaded product was obtained at the mixing ratio shown in Table 1, and in order to evaluate the self-flowability of the obtained kneaded product, a flow value immediately after kneading and a flow value after storage for 14 days after kneading were measured. The kneaded material after storage was poured into a metal frame of 40 × 40 × 160 mm without vibration, cured at 80 ° C. for 3 hours, deframed, and then cooled to 105 ° C.
For 24 hours. The apparent porosity and strength of these samples were measured. In addition, about the preservation of the kneaded material, the kneaded material was sealed in a plastic bag, and then left in an atmosphere at 20 ° C. For the flow value, see cement JI
Using an S-cone (JISR2521), a flow value (free flow value) after one minute without vibration was measured. The corrosion resistance was evaluated by setting a sample prepared by the above-described method in a rotary drum erosion apparatus and performing an erosion test using blast furnace slag at 1500 ° C. for 5 hours. Blast furnace slag is changed every hour,
1.2 kg was used each time. The erosion size by this erosion test was measured and indicated as an index when the product 1 of the present invention was set to 100. The larger the value, the larger the erosion dimension.

[0024]

[Table 1]

In Table 1, the synthetic resin emulsion is Polysol OLX-1992 (polyacrylic ester emulsion, solid content 45 ± 1%) manufactured by Showa Polymer Co., Ltd.
And a thermosensitive gelling agent manufactured by Kao Corporation, manufactured by Latemul NP-
5150 (alkylene oxide adduct of alkylphenol-formalin condensate) and sodium silicate glass having a weight ratio of Na ₂ O / SiO _{2 of} 3.2.

All of the products of the present invention were excellent in self-fluidity even after storage for 14 days after kneading, and a construction with low porosity was obtained in construction without vibration. Good results were also obtained in strength and corrosion resistance.

[0027]

As described above, the thermosetting pouring material for gutters of the present invention has excellent self-flowability due to the fine particle portion having a specific particle size composition, and is dense even in non-vibration construction. Thus, a construction having high strength and high corrosion resistance can be obtained. Further, even after storage after kneading, the decrease in self-flowability is very small, and construction can be performed without vibration even after 14 days.

Further, the use of the thermosetting pouring material for gutters of the present invention eliminates the necessity of a vibrating operation at the time of construction, which is a problem in the construction of the thermosetting pouring material.
It greatly contributes to labor saving of construction work and improvement of work environment. In addition, it is possible to fill a narrow construction site without using frame vibration, and it is also possible to reduce the amount of disassembly in the case of extension construction, which greatly contributes to reduction of construction equipment cost and unit cost of material.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-69745 (JP, A) JP-A-7-157370 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C04B 35/66

Claims (1)

(57) [Claims] Claims: 1. A refractory aggregate, a fine powder and a thermosetting binder.
Thermosetting pouring material for gutters
The binder is a thermosensitive synthetic resin emulsion and / or
It is a thermogelling agent, and the addition and blending amount of thermosetting binder is resistant.
0.05 to 5 weight per unit of fire aggregate and fine powder
% Of fine powder having a particle size of 45 μm or less is 20 to 30% by weight.
The weight ratio of the fine powder having a particle size of 20 to 45 μm to the fine powder having a particle size of less than 20 μm is 1.0 or less, and the cement JIS cone (JIS R252) immediately after kneading and 14 days after kneading.
Flow value after 1 minute without vibration using 1) is 160 mm
A thermosetting pouring material for gutters, characterized in that: