JPH0625028B2 - Binder for hot furnace repair material - Google Patents

Description

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

[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 furnace repair material for repairing such a damaged portion of the furnace is mainly composed of refractory aggregates such as alumina, magnesia, carborundum, coke, clay, silica, and silica. Aggregate alone cannot be used as a furnace repair material.For this reason, a binder is added and kneaded into an appropriate shape to give appropriate plasticity and tackiness, so that it can be used properly according to the damaged part of the furnace. , For example, for spraying, for pouring, for pouring, etc.

The hot-furnace repair material is used throughout the furnace operation, and if the repair time is too long, it causes deterioration of the operability of the furnace operation. It spreads to damaged areas, has a fast curing speed, and
Excellent high temperature adhesiveness is required. The performance of such a hot-furnace repair material depends largely on the performance of the binder used.

And, as the binder of the hot-furnace repair material used for such purposes, resin powder such as phenol resin or a resin binder in which such a resin is dissolved in a solvent, tar, pitch-based binder such as pitch. Known (Japanese Patent Publication Nos. 59-17,072, 56-20,329 and 58-23,351). Then, the hot-furnace repair material using such a binder is a solid solid construction body in which the gas generated when it receives heat from the high temperature part of the furnace wall, melts, hardens, and carbonizes adheres to the furnace wall. Is also made porous, and in some cases cracks may be generated in this construction body, which is a major cause of lowering the corrosion resistance of the construction body.

[Problems to be Solved by the Invention] As a result of intensive studies conducted by the present inventors in view of such viewpoints, the inventors have formed a furnace wall by adding a small amount of a defoaming agent to a binder for a hot furnace repair material. The inventors have found that it is possible to suppress the porosity of the construction body and the occurrence of cracks as much as possible, thereby improving the corrosion resistance of the construction body, and arrived at the present invention.

Therefore, an object of the present invention is to provide a binder for a hot-furnace repair material capable of forming a work body excellent in corrosion resistance due to less occurrence of porosity and cracks in the work body formed on the furnace wall. It is in.

[Means for Solving the Problems] That is, the present invention provides a resin system for a hot-furnace repair material containing a phenol resin, characterized by containing a silicone oil as an antifoaming agent in the range of 100 to 3,000 ppm. It is a binder.

As the binder used in the present invention, a resin binder such as a phenol resin binder or a pitch binder such as pitch or tar can be used, but a resin binder or a binder containing a resin binder is preferable. The resin binder is typically a phenol resin, and any of a novolac type phenol resin, a resole type phenol resin, a benzylic ether type phenol resin and the like can be used.
Such a phenol resin can be obtained by reacting phenols such as phenol, xylenol, and cresol with formaldehyde in the presence of an acidic catalyst.

In addition, if necessary, other components,
Solvents such as tar oil and ethylene glycol, tars having a high boiling point, and hexamethylenetetramine can be added. In particular, examples of the binder of the present invention include those containing phenol resin or pitch as a main component.

Furthermore, the antifoaming agent used in the present invention is a silicone-based antifoaming agent such as silicone oil such as polymethylsiloxane which is chemically stable and exhibits excellent effects even in a trace amount. The amount of defoaming agent used varies depending on the type of defoaming agent and the type of binder, but is 5
0 to 5,000 ppm, preferably 100 to 3,000 pp
m. If it is less than 50 ppm, the effect of adding the antifoaming agent is hardly recognized, and if it is more than 5,000 ppm, the effect is not improved so much.

When preparing a hot-furnace repair material using the binder of the present invention, the refractory aggregate, the binder and the defoaming agent may be blended in a predetermined ratio and kneaded under heating to be prepared in advance. Alternatively, a binder and an antifoaming agent may be mixed in advance to prepare a binder, and when used, the refractory aggregate may be blended at a predetermined ratio and kneaded under heating. The binder and the defoaming agent may be mixed in a predetermined ratio at the time of use and kneaded under heating to prepare. Examples of the refractory aggregate include conventionally known ones such as alumina, magnesia, carborundum, coke, clay, silica and silica, and these can be used alone or in a mixture of two or more. Can also be used as The mixing ratio of the refractory aggregate is preferably 75 to 85% by weight based on the total amount of the binder and the refractory aggregate.

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

Examples 1 to 3 and Comparative Example 1 Binder consisting of 5% by weight of novolac type phenolic resin, 25% by weight of benzylic ether type phenolic resin, and 70% by weight of solvent containing tar oil, pitch, tar acids and ethylene glycol. 1,000 parts by weight of the antifoaming agent shown in Table 1 was added to 100 parts by weight,
Furthermore, 3 parts by weight of hexamine as a curing agent was mixed and kneaded to prepare a binder.

18 g of 5 g of each of the obtained binders of Examples and Comparative Examples
It is collected in a tester of size φ x 165 mm, heated at 200 ° C using an oil bath to cure, and the height before curing and the height after curing are measured to measure the height of swelling due to curing. I asked. The results are shown in Table 1.

Next, 15 parts by weight of the binder obtained in each of the above Examples and Comparative Examples was mixed with 100 parts by weight of the refractory aggregate,
The mixture was kneaded under heating at ℃ to prepare a lump-shaped hot-furnace repair material.

Regarding the hot-furnace repair material of each of the obtained Examples and Comparative Examples,
This was filled in a magnetic crucible with an inner diameter of 30 mmφ and a height of 150 mm, and the temperature was raised from 300 ° C to 10 ° C / min at a heating rate of 9 ° C in an electric furnace.
The temperature was raised to 00 ° C. and the height before curing and the height after curing were measured to determine the height of swelling due to curing. In addition, the state of the surface after curing was observed and examined for the presence of surface cracks. The results are shown in Table 1.

[Advantages of the Invention] When the binder of the present invention is used, it is possible to suppress the occurrence of porosity and cracks in the construction body formed on the furnace wall as much as possible in repairing the lining of the furnace. This can improve the corrosion resistance of the construction body.

 ─────────────────────────────────────────────────── ─── 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. Inside the Muroran Works (56) Reference JP-A-51-128309 (JP, A) JP-A-56-41869 (JP, A)

Claims (1)

[Claims] 1. A silicone-based oil is used as an antifoaming agent.
Resin binder for hot-furnace repair material containing phenolic resin, characterized by being contained in an amount of up to 3,000 ppm.