JPH06179859A - Adhesive for brick - Google Patents

Abstract

PURPOSE:To provide a adhesive for brick which is used to markedly reduce the term of works and labor by carrying and applying bricks in the form of a unit composed of a number of e.g. heat storage bricks bonded with each other, is inexpensive, does not sag even when thickly applied, does not penetrate into brick, and has sufficient bonding strength. CONSTITUTION:The adhesive comprises 49.9-89.9wt.% epoxy resin, 10-50wt.% inorganic filler and 0.1-5wt.% silane coupling agent.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an adhesive for bricks.

[0002]

2. Description of the Related Art Conventionally, for heat storage bricks stacked in a heat storage chamber of, for example, a glass kiln, a small unit of heat storage bricks having a gas flow path has been constructed one by one by a furnace builder. However, there is currently a shortage of furnace construction workers, and as a result, the construction period required for furnace construction is greatly extended.

In order to cope with the current situation, it may be possible to manufacture an integrated large-sized heat storage brick having a plurality of gas flow paths in advance and increase the construction unit of the furnace to shorten the furnace construction period. However, with the current technology, there is a restriction on the integrated large-sized heat storage bricks in terms of production, use, and usable brick materials, and in order to make the heat storage bricks compatible with a wide range of usage conditions, a small unit of heat storage bricks is required. It is considered to be preferable to use a large number of.

As one method for solving this problem, a method of joining a plurality of heat storage bricks for construction has been studied. That is, if a small unit of heat storage bricks is previously joined with an adhesive to form a joining unit, and if these joining units are piled up, the adhesive will be thermally decomposed or burned during heating, and a small unit of heat storage brick will be piled up. Since it will be the same as before, the construction period required for furnace construction should be shortened.

However, for example, the heat storage bricks stacked in the heat storage chamber of a glass kiln have a temperature of 600 to 15 to be used.
The temperature rises and falls repeatedly in a wide temperature range of 00 ° C, and thermal expansion and contraction are repeated many times from the state where the heat storage bricks are first stacked. It is necessary to provide a thermal expansion margin (gap) of a size commensurate with the thermal expansion between the heat storage bricks.

In the case of stacking a joining unit formed by joining heat storage bricks of small units, when the adhesive is thermally decomposed during use and the heat storage bricks are individually separated, a thermal expansion margin is secured between the joining units. However, if the thermal expansion margin is small,
Due to the agglomeration between the heat storage bricks divided into small units, the thermal expansion allowance becomes insufficient depending on the place where they are stacked.

[0007] Therefore, one solution is to join the individual heat storage bricks with each other with an organic adhesive having a thickness that burns down when heated, or with a spacer sandwiched between them by an adhesive. Conceivable. However, in general, each heat storage brick itself has a variation in size of about 1 to 2 mm, and in addition to the thermal expansion allowance, a thickness that absorbs this amount is required for the joint portion. In addition, the soft adhesive applied to the heat storage brick tends to soak in, and in general, sagging occurs and the thickness of the joint part is partially thinned, or it falls on the floor and is wasted. It is required to be unlikely to occur.

Fluoro-rubber-based adhesives are used as adhesives that do not easily sag.
Examples thereof include urethane-based and silicone rubber-based adhesives, all of which are expensive adhesives, and some of them generate harmful gas when heated, and cannot be used as an adhesive for bricks.

Epoxy adhesives are relatively inexpensive and do not generate toxic gas, but they tend to sag when applied thickly, and adhesives in a fluid state soak into bricks. Will be consumed in large quantities.

Mixing an inorganic filler is generally performed with a paint or the like, but since the bonding strength is reduced by mixing the inorganic filler, it is not preferable as an adhesive. In a glass kiln, the atmosphere in which the heat storage brick is used is alkali. Since it is a high-temperature gas atmosphere containing, a low melting point substance that corrodes the inorganic filler and the alkali during use to erode the heat storage brick, and should not erode the heat storage brick.

[0011]

In view of these problems, the present invention is a brick having a large porosity, which is inexpensive, is resistant to sagging, can form a thick bonding layer, and has a required bonding strength. It seeks to provide an adhesive for bricks that does not soak into and releases toxic pyrolysates.

[0012]

As a result of various studies to solve these problems, the present inventors have found that an adhesive that can achieve the above-mentioned object by blending an epoxy resin with a specific substance. It was found that it can be obtained. Thus, the adhesive for bricks of the present invention has an epoxy resin of 49.9 to 89.
9% by weight (including a curing agent, the same applies hereinafter), 10 to 50% by weight of an inorganic filler, and 0.1 to 5 of a silane coupling agent.
It is characterized in that it is composed of wt%.

In the present invention, a preferred epoxy base agent with low sagging has the chemical formula shown in Chemical formula 2. In addition to various tertiary amines, curing agents include aliphatic diamines, aliphatic polyamines, primary aromatic amines, polyaminoamides, aliphatic acid anhydrides, alicyclic acid anhydrides, aromatic acid anhydrides. Compounds, halogen-based acid anhydrides, initial condensation products of phenol and formaldehyde (resole resin), etc. can be used.

[0014]

[Chemical 2]

Next, examples of the inorganic filler used in the adhesive of the present invention include powders of sepiolite (a kind of clay mineral having a composition of 3MgO.4SiO ₂ .5H ₂ O), asbestos, calcium carbonate, alumina and the like. However, it is preferable to use sepiolite, which has a layered structure because of less sagging.

Although various kinds of silane coupling agents can be used, an aminoepoxy silane coupling agent is particularly suitable because it is easy to secure the bonding strength.

Examples of aminoepoxy silane coupling agents include γ-glycidoxypropyltrimethoxysilane, N-β (aminoethyl) γ-aminopropylmethyldimethoxysilane, N-β (aminoethyl) γ-aminopropyl. Trimethoxysilane, γ-mercaptopropyltrimethoxysilane and the like are mentioned. These are one kind,
Alternatively, two or more kinds may be appropriately used.

In the brick adhesive of the present invention, when the amount of the epoxy resin used is less than 49.9% by weight or the amount of the inorganic filler exceeds 50% by weight, the necessary and sufficient bonding strength is not exhibited. The bonded bricks may be peeled off or fallen off when the bricks are transported or hoisted by a crane or the like during construction, which is not preferable because the workability at the time of applying the adhesive is poor.

On the contrary, when the amount of the epoxy resin is more than 89.9% by weight or the amount of the inorganic filler is less than 10% by weight, the adhesive tends to drip and the amount of the adhesive penetrating into the brick is large, so that the bonding surface is large. It is not preferable in that the amount of the epoxy resin remaining in the product decreases and the bonding strength decreases.

When the amount of the silane coupling agent used is less than 0.1% by weight, the required bonding strength is difficult to develop, and when it exceeds 5.0% by weight, the strength is further increased. It is not preferable because the effect of improving the above is not obtained and the drug is simply wasted.

Of these blending ratios, 65.5 to 86.5% by weight of epoxy resin and 13 to 3 of inorganic filler are used.
When the amount of the silane coupling agent is 4% by weight and the silane coupling agent is 0.5 to 1% by weight, all of the bonding strength, sag, and workability of coating are good, and it is particularly preferable as an adhesive for bricks.

In order to secure a joint portion which burns down during use and serves as a thermal expansion margin, in addition to the method of thickly applying the adhesive for bricks according to the present invention to form a joint portion having a desired thickness, it is also burnt out. There is a method of forming a joint with a spacer interposed therebetween, which makes it easier to form a thick joint, and it is also possible to reduce the amount of pyrolyzed substances.

[0023]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

Alumina cement-based castable amorphous castable composition (Asahi Caster 13S, Asahi Glass Co., Ltd.) 88.5% by weight, water 11.5% by weight
Is added and mixed with stirring, and the obtained kneaded clay is poured into the form while vibrating and left for 24 hours, then the form is removed and 110
Dry in a drying room at ℃ for 24 hours, 10mm × 5mm × 5
A 0 mm test piece was obtained. A bonding test was performed using the 0.5 cm ² end surface of this test piece as a bonding surface.

That is, using two test pieces each, the prepared epoxy resin adhesive was applied to the end surface of one test piece and joined to the end surface of the other test piece for a predetermined time (3 hours, 5 hours). Time, 7 hours, 24 hours), the tensile breaking strength was measured and shown in Table 1. It is estimated from the stress generated in the joint portion during lifting that the strength required for the joint portion should be 30 kg / cm ² or more by approximation calculation.

As the adhesive, a mixture of an epoxy main agent, a silane coupling agent and an inorganic filler is used as a curing agent, tetraethylenepentamine (hereinafter abbreviated as TPA), the former being 89.3% by weight, The latter was well mixed at a ratio of 10.7% by weight.

Example 1 Epoxy resin (T was added to the base resin having a viscosity of 10,000 cp shown in Chemical formula 2)
86.2% by weight of a mixture of PA as a curing agent), 12.9% by weight of an inorganic filler (sepiolite) and 0.9% by weight of a silane coupling agent (γ-mercaptopropyltrimethoxysilane) with stirring. Was used as adhesive A.

Example 2 66.2% by weight of an epoxy resin (same as above), 33.1% by weight of an inorganic filler (sepiolite) and a silane coupling agent (γ-glycidoxypropyltrimethoxysilane)
Adhesive B was obtained by stirring and mixing 0.7% by weight.

Comparative Example 1 An adhesive C was prepared by mixing 99% by weight of an epoxy resin (same as above) with 1% by weight of the same silane coupling agent as in Example 1 with stirring. This adhesive was liable to sag when applied, and a tendency to penetrate into the test piece was recognized.

[0030]

[Table 1]

COMPARATIVE EXAMPLE 2 Commercially available epoxy resins Tritex GS-1 and Tritex BL manufactured by Taiho Kogyo Co., Ltd., Technodyne AH manufactured by Taoka Chemical Co., Ltd. and Technodyne HT-18 were mixed according to the adhesive A. When the same bonding test was conducted after mixing with the adhesive of No. 3, the bonding strength after 24 hours was 3
Although a strength of 0 kg / cm ² or more was developed, Example 1,
In No. 2, no tendency of sagging was observed even when the adhesive was applied to a thickness of about 5 mm, whereas in this example, when the adhesive was applied to a thickness of 3 mm or more, the adhesive tended to sag. Also,
When the inorganic filler was not mixed, sagging was remarkable, and it was difficult to form a joint having a thickness of 1 mm or more.

Example 3 Using the adhesive A of Example 1, an octagonal tubular heat storage brick having gas channels in the vertical direction (220 mm × 220 mm × height 150 mm, wall thickness 40 mm, weight of each piece is about 12 kg)
18 pieces are arranged in a plane, and two pieces are further stacked in the vertical direction to be integrally joined (hereinafter referred to as a joining unit 1), and 18 pieces are arranged in a plane, and four pieces are further stacked in the vertical direction to be integrally joined. Shown in FIG. 1 (hereinafter,
It is called the joining unit 2. )made.

In FIG. 1, 1 is a joining unit, 2 is a heat storage brick, 3 is a gas flow path, 4 is a nylon band, 5 is a hanging fitting, and 6 is a spacer. The joining unit 1 is lifted by the hanging fitting 5. It is a perspective view explaining. In this case, as for the side surfaces of the heat storage bricks, as shown in the plan view of FIG. 2, the spacers (thickness: 5 mm) made of magnolia wood were sandwiched between them.

A nylon band is passed through the gas flow path of the heat storage brick of the joining unit 1 so that it can be lifted and moved by an electric hoist and hung down, and the work of heat storage brick can be carried out in units of 36 units without any problem. I confirmed. Further, an attempt was made to stack a plurality of joining units 1 on the joining unit 1, and it was confirmed that the heat storage bricks could be efficiently installed in the heat storage chamber.

Further, in addition to the joining unit 1, a method of hoisting the electric hoists at a time in which the joining units 1 are stacked in two stages or three stages is tried by the same simulated construction work, and more efficient construction work is performed. I confirmed that I could do it. It has been recognized that these joining units are easier to transport on a pallet to a construction site than when transporting a small unit of heat storage bricks, and that workers can be released from heavy work.

[0036]

With the adhesive according to the present invention, since there is almost no sagging when applied to a brick, the adhesive is not wasted, and it absorbs the dimensional variation of the heat storage brick and also as a part of the thermal expansion margin of the brick. A usable joint thickness of 2-3 mm is obtained. Therefore, by providing another thermal expansion allowance between joint units that are made by joining a large number of heat storage bricks and forming a joint part with a spacer sandwiched between them, the The problem that the wall of the heat storage room is pushed by the heat storage brick and the heat storage brick is damaged can be easily avoided.

Thus, when the heat-adhesive bricks of the present invention are used to carry and carry out heat-storage bricks by means of a joining unit in which a number of small-unit heat-storage bricks are joined, the heat-storage bricks can be built and carried using mechanical force. Therefore, the work can be efficiently performed without imposing a heavy burden on the workers, and the construction can be performed in a short construction period, by a small number of workers who do not require skill, and at low cost.
Therefore, even in the present situation where skilled workers and workers are in short supply, it is possible to shorten the repair period of the glass kiln and increase its operating rate, and its industrial utility value is great.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a method of hoisting a large number of octagonal tubular small unit heat storage bricks, which are joined units using the brick adhesive, of the present invention using a hoisting metal fitting.

FIG. 2 is a plan view showing an example of a method of joining octagonal tubular small unit heat storage bricks using the brick adhesive of the present invention and sandwiching a spacer therebetween.

[Explanation of symbols]

 1: Joining unit 2: Heat storage brick 3: Gas flow path 4: Nylon band 5: Hanging metal fitting 6: Spacer

Front page continuation (72) Inventor Toshimi Matsuo 5-6-1, Umei, Takasago, Hyogo Prefecture Asahi Glass Co., Ltd. Takasago Plant (72) Inventor Yoshihiko Ota 3-22-22, Musashino, Tokyo (72) Inventor Masanao Takada 4-4-15 Uozaki Nishimachi, Higashinada-ku, Kobe In-house Kamito Rikagaku Kogyo Co., Ltd. (72) Inventor Mitsuo Yokoi 4-4-1-5 Uozaki Nishi-machi, Higashinada-ku, Kobe Ninja Rikagaku Kogyo Co., Ltd. 72) Inventor Shinichiro Furukawa 4-4-15 Uozakinishicho, Higashinada-ku, Kobe-shi Kamito Rikagaku Industrial Co., Ltd.

Claims (5)

[Claims] 1. An adhesive for bricks, which comprises 49.9 to 89.9% by weight of an epoxy resin, 10 to 50% by weight of an inorganic filler, and 0.1 to 5% by weight of a silane coupling agent. . 2. The adhesive for bricks according to claim 1, wherein the inorganic filler is sepiolite. 3. The brick adhesive according to claim 1, wherein the silane coupling agent is an aminoepoxy silane coupling agent. 4. An epoxy resin in an amount of 65.5 to 86.5% by weight, an inorganic filler in an amount of 13 to 34% by weight, and a silane coupling agent in an amount of 0.5 to 1% by weight. Adhesive for bricks. 5. The brick adhesive according to any one of claims 1 to 4, wherein the epoxy resin contains the compound of Chemical formula 1 as a main component. [Chemical 1]