JPH0625029B2 - Binder for furnace repair material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a binder used when manufacturing repair materials for various furnaces exposed to high temperatures during operation, for example, converters, and particularly to hot repair. TECHNICAL FIELD The present invention relates to a binder for a furnace repair material which is advantageously used in manufacturing a material.

[Prior Art] Refractory for a furnace such as a converter containing a high-temperature molten metal is eroded in various parts depending on the operating condition of the furnace, and a damaged portion is locally generated. And, the repair material for repairing such a damaged portion of the furnace is mainly composed of a fire-resistant aggregate such as alumina, magnesia, carborundum, coke, clay, silica, silica stone, etc. The material alone cannot be used as a repair material, for this reason a binder is added to give suitable plasticity and tackiness and kneaded into an appropriate shape so that it can be used properly according to the damaged part of the furnace.
For example, they are properly used for spraying, pouring, and throwing.

Of these, especially the repair material for injection is used as a hot repair material during the period between furnace operations, and if the repair time becomes too long, the operability of the furnace operation will decline, so high temperature fluid It is required to have excellent properties, to quickly reach a damaged part of a furnace, to have a high curing speed, and to have excellent high temperature adhesiveness. The performance of such a furnace repair material depends largely on the performance of the binder used.

And as such a binder used for the furnace repair material for such purposes, tar-based ones such as coal tar and resin-based ones such as phenol resin (Japanese Patent Publication No. 59-17,0).
No. 72) is known. However, although the tar-based ones have excellent high-temperature fluidity, the curing speed is slow and it takes a long time to cure. On the contrary, the resin-based ones have a high curing speed but a high-temperature fluidity. There was a problem that it was inferior in adhesiveness and high temperature adhesiveness.

[Problems to be Solved by the Invention] Accordingly, an object of the present invention is not only that the curing rate is high when used as a hot repair material, but also that it has excellent high-temperature fluidity and high-temperature adhesion. An object is to provide a binder for a furnace repair material having excellent properties.

[Means for Solving the Problems] That is, the present invention relates to a non-resin binder for furnace repair material, which is a binder for furnace repair material mainly containing alkylphenols having 9 or more carbon atoms and pitches. is there.

The alkylphenols used in the present invention have 9 or more carbon atoms, preferably 10 or 11 carbon atoms.
It is preferable to use the above-mentioned alkylphenol as a main component. The tar acid component after removing the fraction up to xylenol is particularly preferred.

Further, as the pitches used with the alkylphenols, tar-based or petroleum-based soft pitch, medium pitch,
Hard pitch and the like can be mentioned, but tar-based soft pitch having a softening point of 70 ° C. or lower is preferable, and purified pitch obtained by removing quinoline-insoluble matter from this tar-based soft pitch and / or this It is an impregnated pitch obtained by heat-treating refined pitch. Regarding these pitches, the high temperature adhesiveness is improved by removing the low boiling point component, but if they are excessively removed, the viscosity becomes too high and the high temperature fluidity decreases, so softening occurs. It is preferable that the point is around -10 to 50 ° C.

Regarding the mixing ratio of the above-mentioned alkylphenols and pitches, the higher the ratio of pitches, the higher the high-temperature adhesiveness thereof tends to be, and the curing rate tends to decrease. Therefore, the alkylphenols are preferably 30 to 70% by weight, More preferably, it is 35 to 65% by weight, and the pitch is 70 to
It is 30% by weight, more preferably 65 to 35% by weight.

Regarding the binder for furnace repair material of the present invention, if necessary, as a carbonization promoter, various metal oxides such as molybdenum oxide, tungsten oxide, niobium oxide and zirconium oxide, and metal hydroxides such as zirconium hydroxide can be used. Metal compounds can be added. The addition amount of the metal compound used for this purpose is usually 5 parts by weight or less based on 100 parts by weight of the total of the above alkylphenols and pitches,
It is preferably 3 parts by weight or less. By adding such a metal compound as a carbonization promoter, high temperature adhesiveness is further improved.

The binder for furnace repair material of the present invention can be prepared by mixing the above-mentioned alkylphenols and pitches in a predetermined ratio and kneading them under heating, or refractory during preparation of the furnace repair material. You may mix | blend these alkylphenols and pitches with a predetermined ratio with an aggregate, and knead them under heating.

[Action] The binder for furnace repair material of the present invention exhibits the action similar to that of the phenol resin at the time of its alkylphenols, and improves the curing rate thereof without impairing the high temperature fluidity and high temperature adhesiveness of the pitches. It is believed to be gained.

[Examples] Hereinafter, the present invention will be specifically described based on Examples and Comparative Examples.

Examples 1 to 6 Obtained by using tar acid containing alkylphenol having 9 to 11 carbon atoms as a main component as alkylphenols and removing quinoline insoluble matter from tar-based soft pitch having a softening point of 70 ° C or less as pitches. Using refined pitch or impregnated pitch obtained by heat treatment of this refined pitch,
Molybdenum oxide (MoO ₃ ) or zirconium hydroxide (ZrO (OH) ₂ ) was used as a carbonization promoter, blended in the proportions shown in Table 1, and kneaded at 60 ° C. to prepare the binder compositions of Examples 1 to 6. Was prepared.

10 parts by weight of the obtained binder composition of each example was mixed with 100 parts by weight of the refractory bone mineral, and the mixture was kneaded at 60 ° C. using a Simpson mixer to form a dumpling furnace repairing agent having a size of about 30 mmφ. .

On the other hand, magnesia carbon (MgO / C) brick is about 160m
Test pieces were prepared by cutting out into a size of m × 160 mm × 30 mm, and each test piece was placed in an electric furnace maintained at the set temperature shown in Table 1 and baked, and each test piece was placed on each test piece. Each of the dumpling-shaped furnace repair materials prepared by using the binder composition of Example 1 was placed.

When each furnace repair material was placed on each test piece, it immediately smoked,
This smoke disappeared in a few minutes. After the fuming subsided, each furnace repair material placed on each test piece was pecked in an electric furnace to examine the adhesion of each furnace repair material to each test piece. The results are shown in Table 1.

Further, each test piece was taken out from the electric furnace, allowed to cool, and the developed area of each dumpling-shaped furnace repair material spread in each test piece was measured to examine the high-temperature fluidity. The results are shown in Table 1.

Comparative Examples 1 and 2 Coal tar as a binder (Comparative Row 1), and a composition having a composition of 10% by weight of phenol resin and 50% by weight of alkylphenol used in each of the above examples and 40% by weight of purified pitch (Comparative Row 2). A furnace repair material was prepared in the same manner as in each of the above-mentioned examples except that it was used, and its performance was examined. The results are shown in Table 1.

[Effects of the Invention] The binder of the present invention, when mixed with a refractory aggregate, provides a furnace repair material for hot repair not only having a high curing rate but also having excellent high temperature fluidity and high temperature adhesiveness. It is also useful as a binder for furnace repair materials.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kenji Kitaya Kenji, Niihama 1-1-3, Arai-cho, Takasago, Hyogo Prefecture Harima Ceramic Co., Ltd. (72) Inventor Yukihiko Goto 1-1-3, Niihama, Arai-cho, Takasago, Hyogo Prefecture Harima Ceramics Co., Ltd. (72) Inventor Hiroshi Sakamoto 12 Nakamachi, Muroran City, Hokkaido Nippon Steel Co., Ltd. In-house Muroran Works (56) Reference JP-A-53-28607 (JP, A) JP-A-47-5573 (JP, A) JP 60-246256 (JP, A) JP 56-41869 (JP, A)

Claims (3)

[Claims] 1. A non-resin binder for furnace repair material, which is mainly composed of alkylphenols having 9 or more carbon atoms and pitches. 2. The pitches are refined pitches obtained by removing quinoline insoluble matter from tar-based soft pitches having a softening point of 70 ° C. or lower and / or impregnated pitches obtained by heat-treating the refined pitches. Item 1. A binder for a furnace repair material according to Item 1. 3. A binder for a furnace repair material according to claim 1, which comprises 30 to 70% by weight of alkylphenols and 70 to 30% by weight of pitches, and optionally contains a metal compound as a carbonization accelerator.