KR102175415B1 - Composition for binding rocks and binding method for rocks using the same - Google Patents

Abstract

The present invention relates to a rock bonding composition and a rock bonding method using the same.
The rock bonding composition according to the present invention includes silica sand, adhesives, ethylene vinyl acetate (EVA) resin, and water.
According to the above configuration, the present invention prepares a bonding composition capable of bonding rocks or rocks, so that a large-scale hypothesis is not required, and rocks or rocks can be easily bonded even on a cliff slope or in a narrow place. It is possible to prevent the risk of falling rocks or collapse of rocks or rocks in advance, and it can create a nature-friendly and beautiful atmosphere by matching the surrounding natural environment.

Description

Rock bonding composition and rock bonding method using the same {COMPOSITION FOR BINDING ROCKS AND BINDING METHOD FOR ROCKS USING THE SAME}

The present invention relates to a rock joining composition and a rock joining method using the same, and more particularly, by preparing a joining composition capable of joining rocks or rocks, it does not require a large-scale hypothesis, and rocks on a cliff slope or in a narrow place. Alternatively, rocks can be easily bonded, thereby preventing the risk of falling rocks, rocks, or rock collapse in advance, and a rock bonding composition that can derive a nature-friendly beautiful atmosphere suitable for the surrounding natural environment, and rocks using the same It relates to the bonding method.

In general, a slope formed in a place where soil is cut or filled, or an artificial structure with a slope formed therein is more likely to lose soil or collapse of the slope than in a naturally filled area.

If this is left unattended, there is a concern that the area may collapse due to the loss of natural soil and the collapse of the slope or damage to structures built around it. In other words, it damages buildings, apartment houses, roads, etc., and artificial structures with slopes, such as levees, breakwaters, spinning agents, seawalls, protective walls, tunnels and walls, piers, and landfills, etc.

If the slope is not reinforced, it is very cumbersome, such as removing the lost soil and performing restoration work whenever the soil is lost or the slope collapses, and there is a concern of property and human damage, especially natural such as typhoons and floods. In the event of a disaster, the damage to it is more sudden and enormous, so reinforcement work must be carried out to prevent safety accidents.

As a reinforcement work on the slope, a separate reinforcing structure is installed on the slope.As a reinforcement structure on the slope, a slope is usually formed on the surface of the slope by forming a slope with concrete to prevent soil from flowing out, or a slope made of concrete slope or soil. A reinforcing structure is formed on its own to protect the inclined wall and prevent soil from flowing out from the inclined surface.

In order to reinforce the inclined wall or the inclined surface in this way, conventionally, a pile is buried from the ground to the inside, a structure formed of horizontal or vertical plastic, steel, or concrete is built on the slope, or a net is installed on the surface. In order to reinforce the slopes, the slopes are primarily reinforced and the slopes are secondarily reinforced to further reinforce the slopes, thereby preventing the loss of soil and preventing collapse of the slopes in advance.

However, this method not only requires a lot of cost and installation time, it is difficult to install on the slope, and mainly prevents the loss of soil from the surface, but the reinforcement of the slope itself is not properly performed, and in particular, natural disasters such as typhoons and floods. There is a weak point due to the ground.

Domestic registered patent No. 10-0954118 (registered on April 14, 2010) Domestic registered patent No. 10-0937653 (registered on January 12, 2010) Domestic registered patent No. 10-0660064 (registered on December 14, 2006)

In the present invention, by preparing a bonding composition capable of bonding rocks or rocks, it is possible to easily bond rocks or rocks even on a cliff slope or in a narrow place without requiring a large-scale hypothesis. It is to provide a rock joining composition and a rock joining method using the same, which can prevent the danger of a collapse in advance, and can derive a nature-friendly and beautiful atmosphere suitable for the surrounding natural environment.

Various problems to be solved by the present invention are not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

The rock bonding composition according to the present invention includes silica sand, adhesives, ethylene vinyl acetate (EVA) resin, and water.

The silica sand may be included in a weight ratio of 250 to 350 parts by weight, 150 to 250 parts by weight of adhesive, 50 to 150 parts by weight of ethylene vinyl acetate (EVA) resin, and 300 to 400 parts by weight of water.

The adhesive may be prepared by blending in a weight ratio of 50 to 100 parts by weight of a self-emulsifying epoxy resin, 20 to 40 parts by weight of an acrylic modified polyester resin, 10 to 30 parts by weight of a filler, and 5 to 15 parts by weight of a curing agent.

In addition, the rock joining method according to the present invention removes foreign substances by washing the surface of a rock, rock or rock mass, and after applying a rock bonding composition to the surface of the washed rock, rock or rock mass, drying the rock, rock or rock Bonding the surface of the rock, the rock bonding composition is silica sand 250 to 350 parts by weight, adhesive 150 to 250 parts by weight, ethylene vinyl acetate (Ethylene Vinyl Acetate; EVA) resin 50 to 150 parts by weight and water 300 to 400 parts by weight weight It is included in a ratio, and the adhesive may be prepared including a self-emulsifying epoxy resin, an acrylic modified polyester resin, a pigment, silica, and a curing agent, wherein the adhesive is 50 to 100 parts by weight of a self-emulsifying epoxy resin, acrylic modified poly It is prepared by blending in a weight ratio of 20 to 40 parts by weight of an ester resin, 10 to 30 parts by weight of a filler, and 5 to 15 parts by weight of a curing agent.

Details of other embodiments are included in the detailed description.

In the present invention, by preparing a bonding composition capable of bonding rocks or rocks, it is possible to easily bond rocks or rocks even on a cliff slope or in a narrow place without requiring a large-scale hypothesis. The danger of a collapse can be prevented in advance, and a beautiful, nature-friendly atmosphere can be created by matching the surrounding natural environment.

It will be fully understood that the embodiments of the technical idea of the present invention can provide various effects not specifically mentioned.

1 is a photograph showing washing of rocks or rocks in which the rock bonding composition according to the present invention is used.
2 is a photograph showing the bonding of rocks or rocks using the rock bonding composition according to the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Unless otherwise defined, all terms including technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

Hereinafter, a preferred embodiment will be described in detail with respect to the rock bonding composition according to the present invention with reference to the accompanying drawings.

1 is a photograph showing washing of rocks or rocks in which the rock bonding composition according to the present invention is used, and FIG. 2 is a photograph showing bonding of rocks or rocks using the rock bonding composition according to the present invention.

1 and 2, the rock bonding composition according to the present invention includes silica sand, an adhesive, an ethylene vinyl acetate (EVA) resin, and water.

In addition, in the present invention, the rock bonding composition is in a weight ratio of 250 to 350 parts by weight of silica sand, 150 to 250 parts by weight of adhesive, 50 to 150 parts by weight of ethylene vinyl acetate (EVA) resin, and 300 to 400 parts by weight of water. Can be included.

The silica sand may be natural silica sand or artificial silica sand sieved by crushing rocks, preferably artificial silica sand. The rock constituting the artificial silica sand may be formed by crushing limestone, dolomite, or the like.

In the present invention, a combination of the silica sand having an absorption rate of 3% or less and a particle size distribution of 50 to 150 mesh can be used.If the particle size of the silica sand is larger than 50 mesh, the silica sand is too rough to secure smooth workability. It is difficult to do, and if the silica sand of 150 mesh or less is included, it may cause a decrease in strength and a decrease in adhesion function time.

In addition, in the present invention, the silica sand may contain 250 to 350 parts by weight, and when the content of the silica sand is less than 250 parts by weight, the content of the adhesive is relatively high, resulting in a problem of lowering the flexibility of the rock bonding composition and increasing the cost of raw materials. If it exceeds 350 parts by weight, the content of the adhesive is relatively small, and thus it is difficult to secure sufficient strength.

The ethylene vinyl acetate (EVA) resin may be used to increase adhesion to the surface of rocks, rocks or rocks, and to increase the surface strength of the rock bonding composition.

In the present invention, the EVA resin may be a highly dispersible EVA resin having a Tg = 0°C to -10°C and a solid content of 20 to 40% by weight, and when the Tg value exceeds 0°C, the rock bonding composition is hardened and cracks are generated. If the Tg value is less than -10℃, it is difficult to produce a uniform surface strength due to the softening of the rock bonding composition, and too sticky phenomenon occurs even when the rock bonding composition is mixed, resulting in poor workability. have.

In the present invention, the EVA resin may contain 50 to 150 parts by weight, and if the EVA polymer is contained in less than 50 parts by weight, resistance to surface drying or adhesion may be insufficient, and if it exceeds 150 parts by weight, rock Since the bonding composition is softened, it is difficult to produce a uniform surface strength, and even when the rock bonding composition is blended, too sticky phenomenon may occur, resulting in poor workability.

The adhesive functions as a binder for bonding and fixing rocks, rocks or rocks, and the adhesive may be prepared by including a self-emulsifying epoxy resin, an acrylic modified polyester resin, a pigment, a silica, and a curing agent.

In addition, in the present invention, the adhesive is blended in a weight ratio of 50 to 100 parts by weight of a self-emulsifying epoxy resin, 20 to 40 parts by weight of an acrylic modified polyester resin, 10 to 30 parts by weight of a filler, and 5 to 15 parts by weight of a hardener. I can.

The self-emulsifying epoxy resin is an epoxy resin having an active group capable of emulsifying in itself, and the self-emulsifying epoxy resin is a self-emulsifying modified epoxy resin having an epoxy equivalent of 200 to 230 g/eq. Physical properties such as strength, weather resistance, and water resistance can be remarkably improved.

The self-emulsifying epoxy resin is used in an amount of 50 to 150 parts by weight, and when the self-emulsifying epoxy resin is contained in an amount of less than 50 parts by weight, adhesion and sealing properties may be deteriorated. This delay can occur.

The acrylic-modified polyester resin is condensed and polymerized with a polybasic acid containing 40 to 50% by weight of anhydrous acid and 50 to 60% by weight of an aliphatic acid by condensation polymerization of a polyhydric alcohol containing 80 to 90% by weight of a diol and 10 to 20% by weight of a triol. To prepare a polyester resin having a value of 45 to 65 mgKOH/g, an acid value of 3 mgKOH/g or less, a glass transition temperature of 5 to 20°C, and a weight average molecular weight (Mw) of 2,500 to 3,500, and the polyester resin 50 to 60 weight % And 40-50% by weight of acrylic monomer are grafted to have a weight average molecular weight (Mw) of 5,000 to 7,000, a hydroxyl value of 50 to 60 mgKOH/g, an acid value of 3 mgKOH/g or less, and a glass transition temperature of 10 to 20°C An acrylic modified polyester resin in the range can be prepared.

The filler is added to improve the thermal and physical strength, wear prevention and tear of the rock bonding composition, and to improve corrosion resistance and weather resistance.For example, the filler is perlite, vermiculite , Barite, talc, diatomaceous earth, graphite, silica, and calcium carbonate. Any one or more selected from the group consisting of is used, and the average particle diameter is preferably 1 to 30 μm.

The curing agent is included in the adhesive to perform a function of reacting and curing the rock bonding composition on rocks, rocks, or rocks, and the curing agent may be a mixture of a curing agent resin and a curing accelerator.

Modified aliphatic polyamine may be used as the curing agent resin, and 2,4,6-tridimethylaminomethyl phenol may be used as the curing accelerator, and the curing agent resin and the curing accelerator are 10 to 20 parts by weight of the curing agent resin, respectively And 3 to 8 parts by weight of the curing accelerator may be mixed and used.

On the other hand, the rock bonding composition according to the present invention may further include a primer composition so that the rock bonding composition can be more firmly bonded to the surface of rock, rock or rock.

The primer composition may be applied to the surface of rock, rock or rock to form a primer layer, and the primer layer is applied to the surface of the rock, rock or bedrock to form a It can be firmly attached to the surface of the rock.

That is, the primer layer penetrates between microcracks or voids on the surface of the rock, rock or rock and hardens into a coating film of a network structure, thereby preventing moisture from penetrating into the rock, rock or rock surface, and preventing the moisture or condensation. By this, it is possible to prevent the surface of rocks, rocks, or rock from being corroded, and to improve the adhesion between the rock bonding composition and rocks, rocks or rocks.

The primer composition is mixed in a weight ratio of 40 to 80 parts by weight of an acrylic emulsion resin, 5 to 15 parts by weight of ethylene glycol, 10 to 20 parts by weight of isocyanate, and 10 to 20 parts by weight of a phosphorus monomer, and then added to the mixing tank. It can be prepared by mixing.

The acrylic emulsion resin has a low film formation temperature and excellent flexibility even without the use of a plasticizer, and has excellent weather resistance and abrasion resistance.The acrylic emulsion resin is prepared including a monomer composition, a crosslinkable monomer and a stabilizer, The acrylic emulsion resin may be prepared including 4 to 8 parts by weight of the crosslinkable monomer and 0.1 to 0.5 parts by weight of a stabilizer based on 100 parts by weight of the monomer composition.

The monomer composition may be any one or more monomers selected from the group consisting of alkenyl aromatic monomer, acrylonitrile, vinyl acetate, and vinyl versatate, and the The crosslinkable monomer plays a role of imparting a crosslinking function to the acrylic emulsion resin, and can improve the adhesion of the acrylic emulsion resin. The crosslinkable monomer is a hydroxy functional monomer, an amino functional monomer. Any one or more selected from the group consisting of a monomer, an epoxy functional monomer, a carbonyl functional monomer, and a methylol functional monomer may be used.

The hydroxy functional monomer may be any one or more monomers selected from the group consisting of 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxypropyl acrylate, and 2-hydroxybutyl acrylate, and the amino functional monomer is N ,N-dimethyl aminoethyl methacrylate, N,N-dimethyl aminoethyl acrylate, and N,tert-butyl aminoethyl methacrylate may be used any one or more monomers selected from the group consisting of, the epoxy functional monomer may be used glycidyl methacrylate, the car The bonyl functional monomer may be any one or more monomers selected from diacetone acrylamide or acetoacetoxyrthyl metacrylate, and the methylol functional monomer is any one or more monomers selected from the group consisting of N-methylol acrylamide, N-methylol methacrylamide, and Nn-isobutoxymethyl acrylamide. Can be used.

The stabilizer is added to improve the physical and chemical stability of the acrylic emulsion resin, and the stabilizer may be any one selected from allyl alkyl sulfonate or copolymerizable sulfonate manomer.

The ethylene glycol may be added to improve fluidity and workability before curing, and to improve physical and chemical performance after curing.

In the present invention, the ethylene glycol may contain 5 to 15 parts by weight, and if the ethylene glycol is contained in an amount of less than 5 parts by weight, the effect of adding the ethylene glycol may not be sufficiently exhibited, and 15 parts by weight When included in excess, the overall physical properties of the primer layer may be deteriorated because the overall physical properties are not balanced.

The isocyanate acts as a curing agent, for example, the isocyanate is hexamethylene diisocyanate (HDI), hexamethylene diisocyanate trimer (HDT), isophorone diisocyanate (Isophorone Diisocyanate, IPDI), and cyclohexylmethane. Any one or more selected from the group consisting of diisocyanate (Cyclohexylmethanediisocyanate, H12MDI) may be used.

The phosphorus monomer may be used to improve adhesion to the rock, rock, or rock mass and to improve rust prevention. For example, the phosphorus monomer is bis[2-(methacryloxy)ethyl] phosphate (Bis[ 2-(methacyloyloxy)ethyl] phosphate, DMEP), 2-(methacryloyloxy) ethyl phosphate (2-(methacryloyloxy) ethyl phosphate, MMEP) and Tris (2-methacryloyloxy) ethyl phosphate (Tris(2-methacryloyloxy) ethyl phosphate, TMEP). Any one or more selected from the group consisting of may be used.

Hereinafter, a preferred embodiment will be described in more detail with respect to the rock bonding method using the rock bonding composition according to the present invention with reference to the accompanying drawings.

First, foreign substances can be removed by washing the surface of rocks, rocks, or rock mass.

The rock, rock or bedrock may be a rock, rock, or rock that has the risk of falling rocks or collapse or is trying to form an artificial sculpture.By washing the surface of the rock, rock or rock mass with water, adhesion of the rock bonding composition You can improve your sex.

Next, after applying the rock bonding composition to the surface of the washed rock, rock or rock mass, it may be dried to adhere the surface of the rock, rock or rock mass.

The rock bonding composition may be included in a weight ratio of 250 to 350 parts by weight of silica sand, 150 to 250 parts by weight of adhesive, 50 to 150 parts by weight of ethylene vinyl acetate (EVA) resin, and 300 to 400 parts by weight of water.

The adhesive may be prepared by including a self-emulsifying epoxy resin, an acrylic modified polyester resin, a pigment, a silica, and a curing agent, wherein the adhesive is 50 to 100 parts by weight of a self-emulsifying epoxy resin, and 20 to 40 parts by weight of an acrylic modified polyester resin. Parts by weight, 10 to 30 parts by weight of a filler, and 5 to 15 parts by weight of a curing agent may be mixed and mixed.

On the other hand, in the present invention, in order to allow the rock bonding composition to be more firmly adhered to the surface of rock, rock or rock, after washing the surface of the rock, rock or rock, a primer is applied to the surface of the rock, rock or rock mass. The primer layer can also be formed by applying the composition and drying it.

The primer composition is mixed in a weight ratio of 40 to 80 parts by weight of an acrylic emulsion resin, 5 to 15 parts by weight of ethylene glycol, 10 to 20 parts by weight of isocyanate, and 10 to 20 parts by weight of a phosphorus monomer, and then added to the mixing tank. It can be prepared by mixing.

Hereinafter, preferred embodiments of the rock bonding composition according to the technical idea of the present invention will be described in more detail with reference to the accompanying drawings.

<Example 1>

First, a stone panel processed with raw stone was prepared, and the stone panel was washed to remove foreign substances adhering to the stone panel.

Next, after applying a rock bonding composition to the washed stone panel, it was dried to bond the stone panel.

<Example 2>

First, a stone panel processed with raw stone was prepared, and the stone panel was washed to remove foreign substances adhering to the stone panel.

Next, a primer composition was applied to the washed stone panel and dried to form a primer layer.

Subsequently, a rock bonding composition was applied to the stone panel on which the primer layer was formed, and then dried to bond the stone panels.

<Comparative Example>

After preparing a stone panel adhesive (manufactured by L company), the stone panel was bonded using it.

1. Compressive strength, bending strength test

After measuring and comparing the compressive strength and bending strength of the stone panel prepared by using the rock bonding composition prepared in <Example 1> and <Example 2> and the stone panel prepared in <Comparative Example>, The compared physical properties are shown in [Table 1].

Item Example 1 Example 2 Comparative example Compressive strength (Kgf/cm ² ) 360 370 220 Bending strength (Kgf/cm ² ) 85 89 70 Heavy metal dissolution test Not detected Not detected Not detected

※ Heavy metal elution test items: Hg, Cu, Cr +α, Pb, Cd, As, CN-(mg/L)

Referring to [Table 1] above, it was confirmed that the rock bonding composition prepared according to the present invention has excellent compressive strength, bending strength, and the like compared to the conventional adhesive, and that heavy metals do not elute.

2. Adhesion strength test

After measuring and comparing the adhesive strength of the stone panel prepared using the rock bonding composition prepared in <Example 1> and <Example 2> and the stone panel prepared in <Comparative Example>, compared physical properties Is shown in [Table 2].

① Tester

The testing machine is a tensile testing machine in which the capacity of the testing machine is 15 to 85% of the breaking load, and the tensile speed can be adjusted by 3 mm/min.

② Adhesive strength

For the adhesive strength, a stone panel is installed in a tester using a jig, a tensile test is performed at a tensile speed of 3mm/min, and the maximum load until breaking is measured, and the broken state is recorded.

③ How to find the adhesive strength

The adhesive strength is calculated according to the following equation.

F(Adhesion strength)(N/cm ³ ) = (P: Maximum load (N))/(A: Area of stone panel (cm ³ ))

The adhesive strength is expressed as the average value of 5 stone panel specimens.

Item Example 1 Example 2 Comparative example Adhesive strength (N/cm ³ ) 230 240 125

Referring to [Table 2], it was confirmed that the adhesion strength of the rock bonding compositions prepared according to Examples 1 and 2 was excellent.

In the above, a preferred embodiment of the present invention has been described, but those of ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. I will be able to. Therefore, it should be understood that the exemplary embodiment described above is illustrative in all respects and is not limiting.

Claims (4)

delete delete delete Washing the surface of rocks, rocks or rock mass to remove foreign substances,
After applying a primer composition to the surface of the washed rock, rock or rock mass, drying it to form a primer layer,
After applying the rock bonding composition to the surface of the primer layer on the surface of the washed rock, rock or rock mass, dry it to adhere the surface of the rock, rock or rock mass,
The primer composition is mixed in a weight ratio of 40 to 80 parts by weight of an acrylic emulsion resin, 5 to 15 parts by weight of ethylene glycol, 10 to 20 parts by weight of isocyanate, and 10 to 20 parts by weight of a phosphorus monomer, and then added to the mixing tank. Manufactured by
The acrylic emulsion resin is prepared including a monomer composition, a crosslinkable monomer, and a stabilizer, but the acrylic emulsion resin is prepared including 4 to 8 parts by weight of the crosslinkable monomer and 0.1 to 0.5 parts by weight of a stabilizer based on 100 parts by weight of the monomer composition. In the monomer composition, any one or more monomers selected from the group consisting of alkenyl aromatic monomer, acrylonitrile, vinyl acetate, and vinyl versatate are used, and the The crosslinkable monomer is at least one selected from the group consisting of a hydroxy functional monomer, an amino functional monomer, an epoxy functional monomer, a carbonyl functional monomer, and a methylol functional monomer. Is used, and the stabilizer is any one selected from allyl alkyl sulfonate or copolymerizable sulfonate manomer, and the isocyanate is hexamethylene diisocyanate (HDI), hexamethylene diisocyanate At least one selected from the group consisting of trimer (HDT), isophorone diisocyanate (IPDI) and cyclohexylmethane diisocyanate (H12MDI) is used, and the phosphorus monomer is bis[2-(meta Krilloxy) ethyl] phosphate (Bis[2-(methacyloyloxy)ethyl] phosphate), 2-(methacryloyloxy) ethyl phosphate (2-(methacryloyloxy) ethyl phosphate) and tris 2-(methacryloyloxy) ethyl phosphate (Tris (2-methacryloyloxy)ethyl phosphate) selected from the group consisting of Any one or more is used,
The rock bonding composition is included in a weight ratio of 250 to 350 parts by weight of silica sand, 150 to 250 parts by weight of adhesive, 50 to 150 parts by weight of ethylene vinyl acetate resin, and 300 to 400 parts by weight of water,
The adhesive is prepared by blending in a weight ratio of 50 to 100 parts by weight of a self-emulsifying epoxy resin, 20 to 40 parts by weight of an acrylic modified polyester resin, 10 to 30 parts by weight of a filler, and 5 to 15 parts by weight of a curing agent, but the self-emulsifying type As for the epoxy resin, a self-emulsifying modified epoxy resin having an epoxy equivalent of 200 to 230 g/eq is used, and the acrylic modified polyester resin is an anhydride of a polyhydric alcohol containing 80 to 90% by weight of a diol and 10 to 20% by weight of a triol. Condensation polymerization with a polybasic acid containing 40-50% by weight and 50-60% by weight of an aliphatic acid has a hydroxyl value of 45-65mgKOH/g, an acid value of 3mgKOH/g or less, a glass transition temperature of 5-20℃, and a weight average molecular weight (Mw ) To prepare a polyester resin of 2,500 to 3,500, and graft 50 to 60% by weight of the polyester resin and 40 to 50% by weight of an acrylic monomer to obtain a weight average molecular weight (Mw) of 5,000 to 7,000, and a hydroxyl value of 50 Acrylic modified polyester resin with ~60mgKOH/g, acid value of 3mgKOH/g or less, and glass transition temperature in the range of 10-20°C is used, and as the filler, perlite, vermiculite, barite , Talc, diatomaceous earth, graphite, silica, and calcium carbonate. Any one or more selected from the group consisting of is used, the average particle diameter is 1 to 30㎛, the curing agent is a curing agent resin and a curing accelerator Is used by mixing, but the curing agent resin is a modified aliphatic polyamine, the curing accelerator is 2,4,6-tridimethylaminomethyl phenol is used, the curing agent resin and the curing accelerator are each curing agent resin 10 to Rock bonding method, characterized in that the mixture is used in a weight ratio of 20 parts by weight and 3 to 8 parts by weight of a hardening accelerator.

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