JPH01203455A - Resin-based amorphous refractory composition - Google Patents

Abstract

PURPOSE:To obtain the present composition outstanding in low-temperature curing characteristics, suitable for virtually water-free castables to be used in the openings of converters etc., by incorporating refractory aggregate with, as a binder, a specified amount of a specific resorcin-based resin. CONSTITUTION:The objective composition can be obtained by incorporating 100pts.wt. of refractory aggregate (e.g., magnesia, dolomite) with (A) 1-100pts. wt. of a resorcin-based resin produced from an alkylresorcin and formaldehyde, and (B) 0.1-20pts., on an aldehyde basis, of an aldehyde donor (e.g., formalin).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a resin-based monolithic fireproof composition that has excellent curing properties at low temperatures.

[Conventional technology]

Organic resins are widely used in the field of refractories. That is, MgO-C:h, At20. -C
Phenolic resins used in unfired bricks, pitch-impregnated plugging materials for fired bricks, tar used as baking materials, etc. Castables other than the above-mentioned monolithic refractories,
There are various resins used for press-fit materials, mortar, and other monolithic refractories.

For example, novolac type phenol resin mixed with hexamethylenetetramine (Japanese Patent Application Laid-open No. 10315/1983),
Adding metal chlorides to phenol, furan, epoxy, and melamine resins (Japanese Unexamined Patent Publication No. 145071/1983),
Examples include adding lactones to resol type phenolic resin (Japanese Patent Application Laid-open No. 58-20771), and hydrophilic resol type phenol resin and cement material (Japanese Patent Laid-Open No. 61-31364).

In particular, Japanese Patent Publication No. 59-53232 discloses resorcin formaldehyde resin, phenol-modified resorcin formaldehyde resin, tannin-modified resorcin formaldehyde resin, tannin-modified phenol resorcin formal f human mJ]W.

Room-temperature self-hardening large-sized materials have been proposed in which one or more of these materials are contained in a refractory material.

[Problem to be solved by the invention]

However, regarding the monolithic refractories obtained using each of the above resins, those using epoxy resin, melamine resin, and acrylic resin have no residual carbon, do not form carbon bonds, and have good curability, but are not used. Cannot be washed afterwards
There are drawbacks such as difficulty in cleaning the mixer, furan resin has a strong odor, is irritating, and is expensive. Furthermore, the novolak type of phenolic resin is thermosetting and room temperature curing, while the resol type cures at room temperature but is very slow to cure in the winter, and also changes quickly over time, so it can only be stored for about a month. be.

On the other hand, a series of resorcin formaldehyde resins described in Japanese Patent Publication No. 59-53232 are water-soluble, have the advantage of having residual carbon, and are curable at room temperature, but cure in winter very slowly.

[Means to solve the problem]

Therefore, the present inventors used a resorcinol resin (Nagoya Oil Chemical Co., Ltd. trade name: DFK resin) made from alkylresorcinol produced during carbonization of oil shale as a binder. We were able to solve the problem of slow curing speed, especially in winter.

That is, the present invention provides a room temperature curable resin system comprising 100 parts by weight of refractory aggregate, 1 to 100 parts by weight of a resorcinol resin obtained from an alkylresorcinol and formaldehyde, and 0.1 to 20 parts by weight of an aldehyde donor in terms of aldehyde. It is an amorphous refractory composition.

Resorcinol resin (hereinafter referred to as DF) obtained from alkylresorcinol and formaldehyde used in the present invention
K resin (sometimes abbreviated as K resin) is obtained by polycondensing an alkyl group such as a methyl group with alkylresorcinol having 1 to 3 atoms and formaldehyde as a main component.

DFK resin is characterized by high reactivity with aldehydes, water solubility, and easy solubility in alcohol, acetone, etc. Furthermore, it has a high residual carbon content and can be stored for more than - years. DF
The viscosity of K resin can be adjusted by diluting it with water, alcohols such as methyl alcohol and ethyl alcohol, ethylene glycol, etc., acetone, and the like.

The blending amount of the DFK resin of the present invention is preferably 1 to 100 parts by weight per 100 parts by weight of the refractory aggregate. If it is less than 1 part by weight, the amount of carbon that forms bonds in the monolithic refractory will be small, resulting in insufficient strength, which is not preferable. 100 again
If it exceeds the weight part, the refractory aggregate will separate and settle, and the structure after heating will become too porous, which is not preferable.

The aldehyde donor used in the present invention is necessary for cold curing of the DFK resin. Formalin and paraform can be used as aldehyde donors. Hexamethylenetetramine can also be used if heat curing is desired. The amount of the aldehyde donor blended is 0.1 to 20 parts by weight based on 100 parts by weight of the DFK resin in terms of aldehyde. If it is less than 0.1 part by weight, the curing speed in winter is slow and the curing strength is insufficient, which is not preferable. If it exceeds 20 parts by weight, it is not preferable because the curing is too fast, the pot life is short, and problems arise in terms of work.

The refractory aggregates used in the amorphous refractory composition of the present invention include magnesia, dolomite, lime, alumina, and
Various materials such as clinker such as spinel, electrolyte, SiC, C, chamotte, mullite, and silica can be used.

In addition, metals such as At, 8i, Mg-At, and ultrafine powders of Sing, At, O, and the like may be added to the amorphous refractory composition of the present invention for the purpose of developing hot strength.

〔Example〕

Table 1 shows a comparison between the product of the present invention and the conventional product. The table lists the compounding amount and characteristics.

(Hereafter, the rest is white) It can be seen that the product of the present invention has excellent curability.

〔Effect of the invention〕

Since the product of the present invention is used by kneading powder (refractory aggregate) and liquid (binder, etc.) at the site of use in a steel factory, it requires the use of a mixer, a conveying container (pressure pump, hose, However, since the DFK resin used in the present invention is water-soluble, it can be easily cleaned. Furthermore, conventional phenolic resins and resorcinol formaldehyde resins have the disadvantage that curing is significantly delayed at temperatures below 10°C in winter, the work is not completed within the planned working time, and heating is required to accelerate curing. Now that shortcoming has been resolved.

Furthermore, since D F K resin has a residual carbon content comparable to that of phenol resin, it can form excellent carbon bonds.

Therefore, the products of the present invention are suitable for use in non-water or low-moisture castables, mortars,
It is useful as a press-fitting material, a backing material, etc., and has great industrial value.

Patent applicant: Shinagawa White Brick Co., Ltd.

Claims (1)

[Claims] (1) A room-temperature curable resin compound consisting of 100 parts by weight of refractory aggregate, 1 to 100 parts by weight of a resorcinol resin obtained from an alkylresorcinol and formaldehyde, and 0.1 to 20 parts by weight of an aldehyde donor in terms of aldehyde. Shaped refractory composition