KR102280427B1 - Artificial marble and method for manufacturing thereof - Google Patents

Abstract

An artificial marble is provided which is a cured product of a composition comprising a resin syrup and an inorganic filler and has a specific gravity of 1.75 to 2.5 at 25°C.

Description

Artificial marble and its manufacturing method

It relates to artificial marble and a method for manufacturing the same.

Recently, artificial marble has been spotlighted as a substitute for natural marble, and it has a softness and soft texture, excellent workability, excellent weather resistance and excellent durability, and thus can be used for various purposes. Due to these properties of artificial marble, for example, it can be used for interior and exterior materials for construction such as sinks, washbasins, bathtubs, counter tops, door thresholds, furniture, dining tables, interior wall materials, etc. of various counters such as sinks, washbasins, bathtubs, and various interior sculptures.

Some of the above uses are required to be flame retardant for safety, and their importance has been further emphasized due to various fire accidents that have occurred recently. In this case, an organic flame retardant may be added to maintain the flame retardancy, but there is a problem in that substances harmful to the human body are detected in the case of the organic flame retardant.

One embodiment of the present invention provides an artificial marble that exhibits excellent flame retardancy over the entire artificial marble, and can prevent warpage and the like.

Another embodiment of the present invention provides a method for manufacturing the artificial marble.

In one embodiment of the present invention, an artificial marble is provided which is a cured product of a composition comprising a resin syrup and an inorganic filler, and has a specific gravity of 1.75 to 2.5 at 25°C.

In another embodiment of the present invention, preparing a resin syrup; preparing a composition by mixing an inorganic filler with the resin syrup; and preparing artificial marble by curing the composition, wherein the artificial marble is at 25° C. and has a specific gravity of 1.75 to 2.5.

The artificial marble exhibits excellent flame retardancy over the entire artificial marble, and can prevent warping.

Advantages and features of the present invention, and a method of achieving them will become clear with reference to the following examples. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, Only the present embodiments are provided so that the disclosure of the present invention is complete, and to completely inform those of ordinary skill in the art to which the present invention belongs, the scope of the invention, the present invention is defined by the scope of the claims will only be

In one embodiment of the present invention, an artificial marble is provided which is a cured product of a composition comprising a resin syrup and an inorganic filler, and has a specific gravity of 1.75 to 2.5 at 25°C.

Artificial marble is a cured product of a composition including resin syrup, and when burning, the resin decomposes into oligomers or monomers to release heat, and generates radicals to accelerate combustion, so flame retardant performance may be insufficient. When an organic flame retardant is added to improve flame retardancy, there is a problem in that substances harmful to the human body are detected.

The artificial marble is a cured product of a composition comprising a resin syrup and an inorganic filler, and at 25° C., by having a high specific gravity of about 1.75 to about 2.5, without including an organic flame retardant, improved flame retardancy is secured and warping is prevented excellent physical properties such as

Specifically, when the specific gravity of the artificial marble is less than the above range, there may be a problem in that the flame retardancy is significantly lowered, and when it exceeds the above range, the viscosity stability of the artificial marble composition is significantly decreased, and the surface and the back surface of the artificial marble are flame retardant. The difference is large, and there may be a problem that construction is difficult because it is too heavy.

The artificial marble is a cured product of a composition including a resin syrup and an inorganic filler, and is an acrylic resin, an unsaturated polyester-based resin, an epoxy-based resin, a polyvinyl chloride-based resin, a polystyrene-based resin, a polycarbonate-based resin, and a polyethylene terephthalate-based resin. It may include a resin syrup comprising one selected from the group consisting of a resin, a styrene-methyl methacrylate copolymer resin, and combinations thereof. For example, the composition may include an acrylic resin syrup including an acrylic resin and an acrylic monomer.

Specifically, the acrylic resin may have a weight average molecular weight of about 50,000 g/mol to about 150,000 g/mol. If the weight average molecular weight of the acrylic resin is less than the above range, the viscosity of the composition may be lowered and flowability may be excessively increased. If the weight average molecular weight of the acrylic resin is less than the above range, the viscosity of the composition may be increased, and viscosity stability may be reduced.

The melt flow rate of the acrylic resin (Melt flow rate, 230 ℃, 3,8kg) (test method ASTM D 1238) is about 0.5g/10min to about 10g/10min, or about 2.0g/10min to about 6.0g/10min can be When the melt flow index of the acrylic resin is less than the above range, when the acrylic syrup containing the acrylic resin is kneaded with an inorganic filler, the melt viscosity is high, the viscosity stability is poor, the moldability may be reduced, and when it exceeds the above range The melt viscosity may be too low and the moldability may deteriorate.

The acrylic monomer is an alkyl group-containing (meth)acrylate-based monomer, a hydroxy-containing (meth)acrylate-based monomer, a carboxyl group-containing (meth)acrylate-based monomer, a nitrogen-containing (meth)acrylate-based monomer, and combinations thereof It may include one selected from the group.

The composition may include one inorganic filler selected from the group consisting of aluminum hydroxide, magnesium hydroxide, calcium carbonate, silica, alumina, and combinations thereof to impart flame retardancy, for example, the inorganic filler may be aluminum hydroxide there is. The inorganic filler may be included in the composition to cause a dehydration reaction at a temperature of about 200° C. to about 300° C. and at the same time cause an endothermic reaction, thereby improving flame retardancy.

The composition may include about 300 parts by weight to about 1,000 parts by weight of the inorganic filler based on 100 parts by weight of the resin syrup. The composition can impart significantly improved flame retardancy by including an inorganic filler in the above range. Specifically, when the content of the inorganic filler is less than the above range, there may be a problem in that the specific gravity of the artificial marble is lowered and the flame retardancy is lowered. And, when it exceeds the above range, compatibility with the resin syrup is poor, inorganic fillers are aggregated and precipitated, and there is a problem in that the viscosity stability of the artificial marble composition is lowered, and the flame retardancy is lowered.

In addition, the inorganic filler may have a diameter of about 1 μm to about 100 μm. The inorganic filler has a diameter in the above range, does not agglomerate or precipitate, and is densely distributed between the resin syrup, increasing interaction with the resin, preventing warping, and giving excellent physical properties such as flexural strength at the same time can do.

The composition may further include one additive selected from the group consisting of a dispersant, a coupling agent, a crosslinking agent, and combinations thereof.

Specifically, the dispersant may be a compound having an alkylene repeating unit having 2 to 15 carbon atoms and a silane group at the terminal. The silane group of the dispersant can easily bond with the inorganic filler, for example aluminum hydroxide. Accordingly, it is possible to prevent the inorganic fillers from aggregating and precipitating. In addition, the alkylene repeating unit having 2 to 15 carbon atoms contained in the compound has no reactivity and does not reduce the physical properties of the artificial marble, and excellent compatibility with the resin syrup, for example, polymethyl methacrylic resin and methyl methacrylic. can represent Accordingly, the dispersant imparts excellent viscosity stability to the composition without reducing the physical properties such as flame retardancy and flexural strength of the artificial marble, and uniformly and improved flame retardancy throughout the artificial marble, which is a cured product of the composition.

More specifically, the dispersant may have an ether functional group. That is, the dispersant may be a compound having an alkylene repeating unit having 2 to 15 carbon atoms, polyether functionalized, and having a silane group at the terminal. The dispersant may be a compound having the ether functional group at the other end. Specifically, the dispersant may be a polyalkylene glycol functionalized silane compound having an alkylene repeating unit having 2 to 15 carbon atoms. For example, the dispersant may be a polyalkylene glycol functionalized alkoxysilane having an alkylene repeating unit having 2 to 15 carbon atoms. Specifically, the dispersant is polyethylene glycol alkoxysilane, polypropylene glycol alkoxysilane, polybutylene glycol alkoxysilane, polypentylene glycol alkoxy silane, polyhexylene glycol alkoxy silane, polyheptylene glycol chol alkoxy silane, polyoctylene glycol alkoxy silane, polynonylene glycol alkoxy silane, and the like.

The freezing point of the dispersant may be less than about -10°C. Specifically, it may be about -30°C to about -8°C. And, the flash point (flash point) of the dispersant may be greater than about 95 ℃. Specifically, it may be about 98 °C to about 120 °C. The dispersant has a freezing point and a flash point in the above range, thereby improving the dispersibility of the inorganic filler, further improving compatibility with the resin syrup, and imparting excellent flame retardancy without reducing the physical properties of the artificial marble. can

The dispersant may be included in an amount of about 0.5 to about 10 parts by weight based on 100 parts by weight of the inorganic filler. The composition includes the dispersant in the above range to exhibit uniform and excellent flame retardancy throughout the artificial marble, and at the same time realize excellent flexural strength of the artificial marble. Specifically, when the content of the dispersant is less than the above range, the viscosity stability of the artificial marble composition is lowered, the flame retardancy is lowered compared to the content of the inorganic filler, and the difference in total heat output between both surfaces of the artificial marble is large. can occur And, when it exceeds the above range, a problem that the flame retardancy becomes non-uniform may occur.

The composition may further include a coupling agent. The coupling agent is vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3 -Glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, p-styryltrimethoxysilane, 3-(meth)acryloxypropylmethyldimethoxysilane, 3-(meth)acryloxy Propyltrimethoxysilane, 3-(meth)acryloxypropylmethyldiethoxysilane, 3-(meth)acryloxypropyl triethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltri Ethoxysilane, 3-triethoxysilyl-N-(1,3-dimethyl-butylidene)propyl amine, N-phenyl-3-aminopropyltrimethoxysilane, N-(vinylbenzyl)-2-amino Hydrochloride salt of ethyl-3-aminopropyltrimethoxysilane, 3-chloropropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, bis(triethoxysilylpropyl) It may include one selected from the group consisting of tetrasulfide, 3-isocyanate propyltriethoxysilane, and combinations thereof. For example, the coupling agent is 3-(meth)acryloxypropylmethyldimethoxysilane, 3-(meth)acryloxypropyltrimethoxysilane, 3-(meth)acryloxypropylmethyldiethoxysilane, 3-( meth)acryloxypropyl triethoxysilane. By having a (meth)acryl group, the coupling agent may further improve compatibility with the resin syrup. For example, the composition can easily form a crosslinked structure by including a resin syrup containing an acrylic resin and the coupling agent having a (meth)acrylic group. In addition, the silane group of the coupling agent may be bonded to the inorganic filler, for example, aluminum hydroxide. Accordingly, it is possible to improve the bonding between the organic resin syrup and the inorganic filler, thereby preventing the artificial marble from bending and improving the flexural strength.

The coupling agent may be included in an amount of about 0.5 to about 10 parts by weight based on 100 parts by weight of the inorganic filler. The composition includes the coupling agent in the above range to exhibit uniform and excellent flame retardancy throughout the artificial marble, and at the same time realize excellent flexural strength of the artificial marble.

And, the composition may further include a crosslinking agent as an additive. Specifically, the crosslinking agent may include one selected from the group consisting of a difunctional (meth)acrylate-based monomer, a difunctional (meth)acrylate-based oligomer, and a combination thereof, thereby improving high-temperature elongation. The bifunctionality may refer to the presence of two predetermined groups including a double bond capable of forming a bond during the curing reaction, for example, two acrylate groups.

The bifunctional (meth)acrylate-based monomer is, for example, 1,2-ethylene glycol diacrylate, 1,12-dodetandiol acrylate, 1,4-butanediol di(meth)acrylate, 1,6 -hexanediol di(meth)acrylate, neopentylglycol di(meth)acrylate, polyethylene glycol 200 di(meth)acrylate, polyethylene glycol 400 di(meth)acrylate, polyethylene glycol 600 di(meth)acrylate, Neopentylglycol adipate di(meth)acrylate, hydroxypivalic acid neopentylglycol di(meth)acrylate, dicyclopentanyl di(meth)acrylate, caprolactone Modified dicyclopentenyl di(meth)acrylate, ethylene oxide modified di(meth)acrylate, di(meth)acryloxy ethyl isocyanurate, allylated cyclohexyl di(meth)acrylate, tri Cyclodecane dimethanol (meth) acrylate, dimethylol dicyclopentane di (meth) acrylate, ethylene oxide-modified hexahydrophthalic acid di (meth) acrylate, tricyclodecane dimethanol (meth) acrylate, neopentyl glycol Modified trimethylpropane di(meth)acrylate, adamantane di(meth)acrylate, 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorine and these It may include at least one selected from the group consisting of a combination of.

The glass transition temperature of the bifunctional (meth) acrylate-based monomer may be from about -25 to about 55 ° C, or from about -10 to about 40 ° C. By having a glass transition temperature within the above range, the high temperature elongation will be sufficiently improved. can Accordingly, the artificial marble can implement an excellent surface appearance without the problem of cracks or bursts on the surface even when molded into a three-dimensional shape under high temperature conditions. When the glass transition temperature of the bifunctional (meth) acrylate-based monomer is less than the above range, the hardness is lowered to give a rubbery feeling, and when it exceeds the above range, warpage and post-deformation of the cured artificial marble may occur.

The molecular weight of the bifunctional (meth)acrylate-based monomer may be from about 330 g/mol to about 1,500 g/mol, or from about 500 g/mol to about 1,300 g/mol. If the molecular weight of the bifunctional (meth) acrylate-based monomer is less than the above range, curing shrinkage increases, and there may be a problem that it does not stretch well even when heat is applied, and if it exceeds the above range, bubbles are generated inside the artificial marble Problems may arise.

The bifunctional (meth) acrylate-based oligomer is, for example, polymethyl (meth) acrylate oligomer, polyethyl (meth) acrylate oligomer, polypropyl (meth) acrylate oligomer, polymethyl di (meth) acrylate oligomers, polyethyldi(meth)acrylate oligomers, polydimethyl(meth)acrylate oligomers, polydiethyl(meth)acrylate oligomers, polyethylene glycol di(meth)acrylate oligomers, polyurethane oligomers, and combinations thereof. It may include at least one selected from the group.

The glass transition temperature of the bifunctional (meth) acrylate-based oligomer may be about 45 to about 105° C., or about 45 to about 90° C., and by having a glass transition temperature within the above range, high-temperature elongation can be sufficiently improved. . Accordingly, the artificial marble can implement an excellent surface appearance under high-temperature conditions. When the glass transition temperature of the bifunctional (meth)acrylate-based oligomer is less than the above range, the hardness is lowered to give a rubbery feeling, and when it exceeds the above range, warpage and post-deformation of the cured artificial marble may occur.

The weight average molecular weight of the bifunctional (meth)acrylate-based oligomer may be from about 20,000 to about 120,000 g/mol, or from about 30,000 to about 110,000 g/mol. When the weight average molecular weight of the bifunctional (meth) acrylate-based oligomer is less than the above range, the viscosity is lowered and non-uniformity occurs due to precipitation of inorganic substances, and when it exceeds the above range, the boiling phenomenon of the monomer during thermoforming occurs. Internal air bubbles are generated.

The crosslinking agent may be included in an amount of about 0.18% to about 1.7% by weight in the composition. Specifically, when using a difunctional (meth) acrylate-based monomer as the crosslinking agent, it may be included in an amount of about 0.18 wt% to about 0.7 wt% in the composition, and when using the bifunctional (meth)acrylate-based oligomer, It may be included in the composition in an amount of about 0.18% to about 1% by weight. Alternatively, when both the difunctional (meth)acrylate-based monomer and the bifunctional (meth)acrylate-based oligomer are used as the crosslinking agent, the composition may be included in an amount of about 0.36% by weight to about 1.7% by weight.

By including the bifunctional (meth) acrylate-based monomer and/or the bifunctional (meth) acrylate-based oligomer in an amount within the above range, the thermosetting reaction can be sufficiently proceeded, and in the artificial marble prepared from the composition, A migration phenomenon caused by the presence of a reactive monomer can be effectively prevented. For example, when unreacted monomers are present in the composition, over time, yellowing, etc. may occur on the surface of the artificial marble prepared from the composition, resulting in a color difference, and may deteriorate the quality of the artificial marble. there is.

The composition is an organic peroxide, including diacyl peroxide such as benzoyl peroxide and dicumyl peroxide, butylhydroperoxide, hydroperoxide such as cumylhydroperoxide, t-butyl peroxymaleic acid, t-butylhydroperoxide, t-Butyl hydroperoxybutylate, acetyl peroxide, lauroyl peroxide, azobisisobutyronitrile, azobisdimethylvaleronitrile, t-butyl peroxy neodecanoate, t-amyl peroxy 2- and one polymerization initiator selected from the group consisting of ethyl hexanoate, and combinations thereof.

The artificial marble may have an amount of change in viscosity of the composition of about 2,000 cps or less according to Equation 1 below. For example, the viscosity change amount may be from about 0 to about 2,000 cps or from about 100 cps to about 2,000 cps.

[Equation 1]

Viscosity change (ΔV, cps) = (Vf-Vi)

In Equation 1, Vi is the initial viscosity of the composition at 25°C, and Vf is the viscosity of the composition after curing at 25°C for 2 hours. At this time, the initial viscosity means the composition viscosity after the stirring is finished.

The artificial marble is a thermosetting product of the composition, and by having a low viscosity change in the above range, it exhibits a uniform flame retardancy over the entire artificial marble, prevents bending, and at the same time can exhibit excellent flexural strength and elongation. Specifically, when the amount of change in viscosity exceeds the above range, the difference between the total amount of heat emitted from the surface and the back surface of the artificial marble increases, so it is difficult to secure flame retardancy, and there may be a problem in that the artificial marble is warped.

The artificial marble may have a difference (ΔTHR) in the total amount of heat emitted from both surfaces of the artificial marble by Equation 2 below from about 0 to about 1.

[Equation 2]

Δ THR(MJ/㎡) = ┃T1 - T2┃

In Equation 2, the T1 means the total amount of heat emitted from one surface of the artificial marble, and the T2 means the total amount of heat emitted from the other surface (the back side) facing the one surface.

The artificial marble is a thermosetting product of the composition, and despite including a high content of the inorganic filler, has a change in viscosity within the above range, and may exhibit uniform flame retardancy as described above throughout the artificial marble. Specifically, when the difference (ΔTHR) in the total amount of emitted heat exceeds the above range, there may be problems such as deviations in mechanical properties due to different distributions of organic and inorganic materials on both surfaces.

In addition, the artificial marble may have a total amount of heat emitted for 5 minutes by a cone calorimeter according to ISO 5660-1 of about 8 MJ/m 2 or less. Specifically, it may be about 0 MJ/m 2 to about 8 MJ/m 2 . For example, it can be from about 0 MJ/m2 to about 5 MJ/m2. The total amount of heat emitted refers to the total amount of heat emitted from both surfaces of the artificial marble, that is, one surface and the other. That is, each of both surfaces of the artificial marble satisfies the total amount of heat released in the above range, and can exhibit excellent flame retardancy.

Another embodiment of the present invention comprises the steps of preparing a resin syrup; preparing a composition by mixing an inorganic filler with the resin syrup; and preparing artificial marble by curing the composition, wherein the artificial marble has a specific gravity of about 1.75 to about 2.5 at 25°C.

The above-mentioned artificial marble can be manufactured by the manufacturing method of the artificial marble. That is, despite including a high content of inorganic fillers, excellent viscosity stability is exhibited, and artificial marble, which is a cured product thereof, may exhibit uniform flame retardancy throughout.

The step of preparing the resin syrup may be mixing Susi and a monomer. For example, it may be a mixture of an acrylic resin and an acrylic monomer. The acrylic resin syrup may have a viscosity of about 500 to about 3,000 cps or about 800 to about 2,000 cps at 25°C. If the viscosity of the acrylic resin syrup is less than the above range, curing properties and shrinkage may be reduced, and if it exceeds the above range, handling of the syrup may be difficult.

And, including the step of preparing a composition by including an inorganic filler in the resin syrup. The composition may be prepared by stirring the resin syrup with an inorganic filler and the like at about 20° C. to about 40° C. for about 30 to 60 minutes. At this time, the viscosity of the composition may be about 1,000 to about 10,000 cps, or about 2,000 to about 9,000 cps. If the viscosity of the composition is less than the above range, the thickness of the artificial marble may become non-uniform, and if it exceeds the above range, bubble marks remain on the artificial marble and the artificial marble is exposed to contamination or has an unappealing appearance. can

And, the manufacturing method of the artificial marble comprises the step of preparing the artificial marble by curing the composition. The artificial marble may be manufactured by thermosetting at about 75°C to about 95°C, or about 80°C to about 90°C. When the curing temperature is less than the above range, the content of the residual monomer that has not been cured may increase, resulting in yellowing and deterioration of the quality of the artificial marble. And, when the curing temperature exceeds the above range, there may be problems such as boiling during the production of the plate material. The artificial marble may be cured for about 20 minutes to about 60 minutes.

Hereinafter, specific embodiments of the present invention are presented. However, the examples described below are only for specifically illustrating or explaining the present invention, and the present invention is not limited thereto.

<Examples and Comparative Examples>

Example 1

28 wt% of polymethyl methacrylate (LG Chem, IH830) and 72 wt% of methyl methacrylate were stirred at 60 °C for 30 minutes to prepare an acrylic resin syrup (25 °C, viscosity 1000 cps). And, 75 parts by weight of aluminum hydroxide to 23 parts by weight of the acrylic resin syrup, 1 part by weight of polyethylene glycol alkoxysilane having a freezing point of less than about -10°C and a flash point of greater than about 95°C, 3-(meth)acryloxypropyltri A composition comprising 1 part by weight of methoxysilane and 1 part by weight of polyethylene glycol di(meth)acrylate oligomer having a glass transition temperature of 45°C-55°C and a weight average molecular weight of 53,000, and stirred at 30°C for 40 minutes ( Viscosity 5000 cps, 25 ℃) was prepared. Thereafter, the composition was put into a mold, and then cured at 80° C. for 30 minutes to prepare artificial marble.

Example 2

17 parts by weight of the acrylic resin syrup, 80 parts by weight of aluminum hydroxide, 1 part by weight of polyethylene glycol alkoxysilane, 1 part by weight of 3-(meth)acryloxypropyltrimethoxysilane, and a glass transition temperature of 45°C-55°C and 53,000 Artificial marble was prepared in the same manner as in Example 1, except that the composition was prepared including 1 part by weight of polyethylene glycol di(meth)acrylate oligomer having a weight average molecular weight of .

Example 3

10 parts by weight of the acrylic resin syrup, 87 parts by weight of aluminum hydroxide, 1 part by weight of polyethylene glycol alkoxysilane, 1 part by weight of 3-(meth)acryloxypropyltrimethoxysilane, and a glass transition temperature of 45°C-55°C and 53,000 Artificial marble was prepared in the same manner as in Example 1, except that the composition was prepared including 1 part by weight of polyethylene glycol di(meth)acrylate oligomer having a weight average molecular weight of .

Comparative Example 1

Artificial marble was prepared in the same manner as in Example 1, except that the composition was prepared without a dispersant and a coupling agent, including 61 parts by weight of aluminum hydroxide in 38 parts by weight of the acrylic resin syrup.

Comparative Example 2

Artificial marble was prepared in the same manner as in Example 1, except that the composition was prepared by including 90 parts by weight of aluminum hydroxide, 1 part by weight of a polyacrylate dispersant, and 1 part by weight of a titanate-based coupling agent in 8 parts by weight of the acrylic resin syrup. prepared.

<Evaluation>

Experimental Example 1: Viscosity Stability

The amount of change in viscosity of the compositions prepared in Examples and Comparative Examples was measured according to Equation 1 below.

[Equation 1]

Viscosity change (ΔV, cps) = (Vf-Vi)

In Equation 1, Vi is the initial viscosity of the composition at 25°C, and Vf is the viscosity of the composition after 2 hours at 25°C. At this time, the initial viscosity means the composition viscosity after the stirring is finished.

At this time, when the viscosity change was 2,000 cps or less, "OK" was indicated, and when it exceeded 2,000 cps, it was indicated as "NG".

Experimental Example 2: Specific gravity of artificial marble

The specific gravity of the artificial marbles of Examples and Comparative Examples was measured at 25° C. using a hydrometer, and the results are shown in Table 1 below.

Experimental Example 3: Flame Retardant

Each of the artificial marbles prepared in Examples and Comparative Examples was prepared as a specimen having a size of 100 mm (L) Х 100 mm (W) Х 12 mm (T) using a CNC engraver (TinyCNC-6012).

Then, using a cone calorimeter measuring device (Festek International) according to the measurement conditions of KS F ISO 5660-1, 50 kW radiant heat was applied to the specimen for 5 minutes, and the total amount of heat released (THR) was measured. Specifically, the total amount of heat released from each of the surfaces of the specimen was measured, and the difference (ΔTHR) was obtained by the following Equation 2, and the results are shown in Table 1 below.

[Equation 2]

Δ THR(MJ/㎡) = ┃T1 - T2┃

In Equation 2, T1 is the total amount of heat emitted from one surface (surface) of the artificial marble, and T2 is the total amount of heat emitted from the other surface (rear surface) facing the one surface.

importance Viscosity Stability Cone Calorimeter (MJ/㎡) surface back side Example 1 1.85 O.K. 4.3 4.7 Example 2 1.90 O.K. 0.8 0.3 Example 3 2.10 O.K. 0.0 0.0 Comparative Example 1 1.70 O.K. 20.8 20.5 Comparative Example 2 2.60 N.G. - -

As shown in Table 1, it can be seen that the artificial marble of Comparative Example 1, which has a low specific gravity, has a low flame retardancy because the total amount of heat emitted is too high. And, in Comparative Example 2, the specific gravity is too high, the viscosity stability is remarkably deteriorated, the artificial marble is not properly formed, and the total amount of heat released cannot be measured. On the other hand, it can be seen that the composition prepared in Examples exhibits excellent viscosity stability, has a specific gravity within the above range, and exhibits uniform flame retardancy over the entire artificial marble.

Claims (14)

It is a cured product of a composition comprising a resin syrup and an inorganic filler,
It comprises 300 parts by weight to 1,000 parts by weight of the inorganic filler relative to 100 parts by weight of the resin syrup,
The inorganic filler is aluminum hydroxide,
at 25°C, the specific gravity is 1.75 to 2.5,
The total amount of heat released for 5 minutes by the cone calorimeter according to ISO 5660-1 is 8MJ/m2 or less,
Artificial marble in which the difference (ΔTHR) of the total amount of heat emitted from both surfaces of the artificial marble (ΔTHR) is 0 to 1 according to Equation 2 below:

[Equation 2]
Δ THR(MJ/㎡) = ┃T1 - T2┃
In Equation 2, T1 is the total amount of heat emitted from one surface of the artificial marble, and T2 is the total amount of heat emitted from the other surface facing the one surface.
According to claim 1,
The resin syrup is an acrylic resin, an unsaturated polyester-based resin, an epoxy-based resin, a polyvinyl chloride-based resin, a polystyrene-based resin, a polycarbonate-based resin, a polyethylene terephthalate-based resin, a styrene-methyl methacrylate copolymer resin, and combinations thereof comprising one selected from the group consisting of
artificial marble.
delete delete delete delete delete delete According to claim 1,
According to the following formula 1, the viscosity change amount of the composition is 2,000cps or less
Artificial Marble:

[Equation 1]
Viscosity change (ΔV, cps) = (Vf-Vi)
In Equation 1, Vi is the initial viscosity of the composition at 25°C, and Vf is the viscosity of the composition after curing at 25°C for 2 hours.
delete delete preparing a resin syrup;
preparing a composition by mixing an inorganic filler with the resin syrup; and
Including; curing the composition to prepare artificial marble;
The resin syrup has a viscosity of 1,000 to 2,000 cps at 25 ℃,
It comprises 300 parts by weight to 1,000 parts by weight of the inorganic filler relative to 100 parts by weight of the resin syrup,
The inorganic filler is aluminum hydroxide,
The composition further comprises an additive comprising a dispersing agent, a coupling agent and a crosslinking agent,
The crosslinking agent includes a bifunctional (meth)acrylate-based oligomer having a glass transition temperature of 45°C to 105°C,
The additive is included in an amount of 0.5 to 10 parts by weight based on 100 parts by weight of the inorganic filler,
The total amount of heat released for 5 minutes by the cone calorimeter according to ISO 5660-1 is 8MJ/m2 or less,
The difference (ΔTHR) of the total amount of heat emitted from both surfaces of the artificial marble according to the following formula 2 is 0 to 1,
The artificial marble has a specific gravity of 1.75 to 2.5 at 25 ℃
Manufacturing method of artificial marble:

[Equation 2]
Δ THR(MJ/㎡) = ┃T1 - T2┃
In Equation 2, T1 is the total amount of heat emitted from one surface of the artificial marble, and T2 is the total amount of heat emitted from the other surface facing the one surface.

13. The method of claim 12,
The dispersant is a compound having an alkylene repeating unit having 2 to 15 carbon atoms and having a silane group at the terminal.
A method for manufacturing artificial marble.
13. The method of claim 12,
The coupling agent is vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3 -Glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, p-styryltrimethoxysilane, 3-(meth)acryloxypropylmethyldimethoxysilane, 3-(meth)acryloxy Propyltrimethoxysilane, 3-(meth)acryloxypropylmethyldiethoxysilane, 3-(meth)acryloxypropyl triethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltri Ethoxysilane, 3-triethoxysilyl-N-(1,3-dimethyl-butylidene)propyl amine, N-phenyl-3-aminopropyltrimethoxysilane, N-(vinylbenzyl)-2-amino Hydrochloride salt of ethyl-3-aminopropyltrimethoxysilane, 3-chloropropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, bis(triethoxysilylpropyl) comprising one selected from the group consisting of tetrasulfide, 3-isocyanate propyltriethoxysilane, and combinations thereof
A method for manufacturing artificial marble.