KR100796435B1 - Artificial marble containing styrene methylmethacrylate chip and lighting fixtures using the same - Google Patents

Abstract

The present invention relates to an artificial marble comprising a styrene-methyl methacrylate (SMMA) chip and a lighting device using the same, (a) a transparent chip containing a styrene-methyl methacrylate copolymer and an inorganic filler, and (b ) Provided is an artificial marble comprising an opaque chip containing acrylic syrup and an inorganic filler and a lighting device using the same.

According to the present invention, the opaque acrylic chip and the transparent SMMA chip are mixed to show a general artificial marble texture in a state in which no lighting effect is added, but when lighting is added, a three-dimensional effect according to light transmittance difference can be realized. In addition, it is possible to integrally mold by heat to manufacture not only two-dimensional but also three-dimensional interior lighting fixtures.

Styrene-methylmethacrylate, lighting fixtures, artificial marble

Description

Artificial marble containing styrene methylmethacrylate chip and lighting fixtures using the same

Figure 1 is a comparison of the light transmission effect of the artificial marble panel including the SMMA chip and the artificial marble panel including the UP chip according to the present invention, a photo before light transmission.

FIG. 2 compares the light transmission effect of the artificial marble panel including the SMMA chip and the artificial marble panel including the UP chip according to the present invention. FIG.

3 is a photograph comparing the thermoforming of the artificial marble panel including the SMMA chip and the artificial marble panel including the UP chip as a comparative example according to the present invention.

Figure 4 is a photograph showing the thermoforming of the artificial marble panel comprising a SMMA chip in accordance with the present invention.

5 is a photograph showing the thermoforming of the artificial marble panel including a UP chip as a comparative example.

6 is a luminaire using an artificial marble panel including an SMMA chip according to the present invention, which is a photograph before light transmission.

7 is a luminaire using an artificial marble panel including an SMMA chip according to the present invention, which is a photograph after light transmission.

The present invention relates to an artificial marble and a lighting device using the same, and more particularly, by using an opaque acrylic chip and a transparent SMMA chip, it is possible to realize a three-dimensional effect according to the light transmittance difference, and artificial marble capable of integral molding by heat. And it relates to a lighting fixture using the same.

Artificial marble is a synthetic synthetic material that combines natural stone powder and minerals with resin components (acrylic, unsaturated polyester, epoxy, etc.) and cement, and adds various pigments and additives to realize the texture of natural stone. Artificial marble, polyester-based artificial marble, etc. are mentioned.

Acrylic artificial marble and polyester artificial marble have strength and color tone peculiar to solid materials. Especially, acrylic artificial marble has excellent processability and weather resistance. Acrylic artificial marble is lighter and more non-porous than natural marble, has an elegant hue that is inferior to natural marble, excellent strength and weather resistance, and can be distinguished from natural marble because of its excellent workability comparable to wood.

On the other hand, polyester-based marble has a disadvantage in that weather resistance and heat resistance are poorer than acrylic artificial marble and are difficult to thermoform, resulting in many limitations in integral molding.However, the refractive index of the polyester-based marble is similar to that of aluminum hydroxide, which is used as a filler. By doing so, there is an advantage that natural and deep appearance can be realized like natural stone.

Such artificial marble is recently used in various applications such as various top plate materials, dressing tables, wash basins, tables, wall materials, flooring materials, furniture, interior materials, indirect lighting panels, interior accessories.

Acryl is a polymer material with high light transmittance and is used for various purposes. In addition, molding into other shapes is easy by heat. However, when it is used as artificial marble because of its low strength and difficult interior effect, it is usually used by mixing an inorganic filler (mainly aluminum hydroxide). When the inorganic filler is mixed, the light transmittance has a weakness which is remarkably decreased.

Japanese Patent Application Laid-open No. Hei 10-17350 discloses an amount of polymerization initiator and acid value suitable for an acrylic syrup having 20 to 40% by weight of a polymer portion obtained by partially copolymerizing 60 to 80% by weight of methyl methacrylate and 20 to 40% by weight of styrene. An acrylic artificial marble is disclosed, wherein an organic acid is added to 7 to 9 to heat-polymerize a mixture of 30 to 50 parts by weight of the acrylic syrup and 50 to 70 parts by weight of powdered glass frit having a refractive index of 1.47 to 1.53. The present invention relates to an acrylic artificial marble having a light transmittance better than that of the conventional one and no bubble generation.

Japanese Patent Application Laid-Open No. 10-298377 discloses a polymerizable syrup (P) composed of a monomer mixture (i) containing a polyfunctional methacrylate and an aromatic vinyl compound and an aromatic vinyl polymer (ii), and having a bulk density of 0.1 to 0.9. 70-35 weight% of resin composition (A) and 30-65 weight% of aluminum hydroxide containing polymer powder (Q) which are in the range of g / ml, and the oil absorption amount with respect to amani oil is in the range of 10-200 ml / 100g. A polymerizable composition comprising the present invention is disclosed, and the present invention relates to a polymerizable composition which is excellent in transparency and other various properties of a molded article obtained by polymerization and curing, and is particularly useful in the shape of natural stone artificial marble.

The present invention has a three-dimensional effect when a light is mixed by using a conventional acrylic chip that does not transmit light by containing inorganic material and an inorganic material that has excellent light transmittance of UP level and also can be thermally molded using SMMA (Styrene Methylmethacrylate) chip. It is to provide artificial marble that can be implemented.

Another object of the present invention to provide a lighting fixture using the artificial marble.

The present invention to achieve the above object, (a) a transparent chip containing a styrene-methyl methacrylate copolymer and an inorganic filler; And (b) provides an artificial marble comprising an opaque chip containing an acrylic resin syrup and an inorganic filler.

In the artificial marble of the present invention, the distinction between the transparent chip and the opaque chip can be distinguished by the naked eye, and specifically, by the total light transmittance (transparency). That is, the total light transmittance of the transparent chip is 40 to 60%, and the total light transmittance of the opaque chip is about 10 to 30%. The total light transmittance is measured with a Hazemeter after curing the chip raw material composition into a flat plate having a thickness of 2 mm.

The transparent chip used in the present invention is 100 parts by weight of a styrene-methyl methacrylate resin solution comprising a styrene-methyl methacrylate copolymer and styrene, methyl methacrylate or a mixture thereof; And 100 to 200 parts by weight of an inorganic filler.

The styrene-methyl methacrylate resin solution is 10 to 50 parts by weight of styrene-methyl methacrylate copolymer; And 50 to 90 parts by weight of styrene, methyl methacrylate or a mixture thereof, and particularly preferably 10 to 70 parts by weight of styrene.

The inorganic filler is at least one selected from aluminum hydroxide, magnesium hydroxide, calcium aluminate, the particle size is preferably 5 to 100 ㎛, the inorganic filler is a silane coupling agent, titanate coupling agent or stearic acid It is preferable that the surface treatment.

In addition, the present invention is to prepare a transparent chip by (a) preparing a flat plate containing a styrene-methyl methacrylate copolymer and an inorganic filler; (b) preparing an opaque chip by preparing a plate containing acrylic resin syrup and an inorganic filler and then grinding the plate; And (c) applying the transparent chip and the opaque chip as an artificial marble raw material.

In addition, the present invention (a) a transparent chip containing a styrene-methyl methacrylate copolymer and an inorganic filler; And (b) an artificial marble comprising an opaque chip containing an acrylic resin syrup and an inorganic filler.

When the artificial marble of the present invention is applied to a luminaire, the artificial marble can be cut to a predetermined size and then thermoformed in a predesigned form or used as a sheet, and in particular, it can be used as a front panel of the luminaire. .

The artificial marble of the present invention is a mixture of opaque acrylic chip and transparent SMMA chip shows the texture of the general artificial marble in the state that the lighting effect is not added, but when the lighting is added, the three-dimensional effect according to the light transmittance difference can be realized. In particular, due to the thermoplastic properties, it is possible to integrally mold by heat, thereby manufacturing interior lighting equipment not only in two dimensions but also in three dimensions.

Hereinafter, the manufacturing process of the artificial marble and the lighting fixture using the same according to the present invention will be described in detail.

First, a transparent chip containing a styrene-methyl methacrylate copolymer and an inorganic filler is prepared.

The transparent chip used in the present invention is 100 parts by weight of a styrene-methyl methacrylate resin solution comprising a styrene-methyl methacrylate copolymer and styrene, methyl methacrylate or a mixture thereof; And an inorganic filler 100 to 200 parts by weight, preferably 0.5 to 10 parts by weight of a crosslinkable monomer, 0.1 to 5 parts by weight of a polymerization initiator, and 0.1 to 5 parts by weight of a chain transfer agent, and an antifoaming agent, a coupling agent, a pigment or a dye. Additives such as UV absorbers, flame retardants, mold release agents, polymerization inhibitors, heat stabilizers, antioxidants and the like may be added.

In the present invention, the styrene-methyl methacrylate resin solution is prepared by dissolving a styrene-methyl methacrylate copolymer in styrene, methyl methacrylate or a mixture thereof at 40 to 60 ° C, wherein the styrene-methylmethacrylate The content of the copolymer in 100 parts by weight of the rate resin solution is 10 to 50 parts by weight, the content of the styrene, methyl methacrylate or a mixture thereof is preferably 50 to 90 parts by weight. When the content of the copolymer is less than 10 parts by weight, there is a problem in that it is not effective to achieve the purpose of improving the reaction rate and preventing the volatilization of the monomer, etc., when the content is more than 50 parts by weight, the undissolved seas are easily present and the dissolution time increases. The viscosity is excessively high, which is not preferable.

Styrene-methyl methacrylate copolymer is prepared by a general polymerization method of styrene monomer and methyl methacrylate monomer under a polymerization catalyst, and the copolymer has the same level of gloss, transparency and surface hardness as compared to methyl methacrylate homopolymer. And it has a low water absorption and maintains excellent weather resistance and has an improved workability. The content of styrene in 100 parts by weight of the styrene-methylmethacrylate copolymer of the present invention is preferably 20 to 80 parts by weight.

The total content of styrene in 100 parts by weight of the styrene-methylmethacrylate resin solution of the present invention is preferably 10 to 70 parts by weight. If the content of the styrene is less than 10 parts by weight, there is a problem that the effect of improving transparency is not large, and when it is more than 70 parts by weight, the heat deformation temperature is lowered and the weather resistance is worsened, and the degree is unsaturated. It is not preferable because there is a problem of polyester-based artificial marble level.

Inorganic fillers used in the present invention are preferably selected from the group consisting of aluminum hydroxide, magnesium hydroxide, calcium aluminate, or a mixture of two or more thereof, and a refractive index of 1.57 to 1.62. Because the difference in refractive index between the filler (for example, aluminum hydroxide is 1.57 to 1.60) when the conventional methacrylate (refractive index 1.49) and only the polymer is used is large, the transparency is reduced, but in the present invention methyl methacrylate This is because the transparency of the polymer can be improved by reducing the difference in refractive index by using a styrene-methyl methacrylate copolymer obtained by copolymerizing a styrene monomer having a high refractive index with a monomer (refractive index 1.59).

The inorganic filler preferably has a surface treated with a silane coupling agent, titanate coupling agent or stearic acid for dispersibility with the resin solution, improvement of mechanical strength of the product, and prevention of precipitation.

A preferred amount of the inorganic filler is 100 to 200 parts by weight based on 100 parts by weight of the styrene-methylmethacrylate resin solution. If the content is less than 100 parts by weight, the flame retardancy of the artificial marble is weakened, the color tone is lost, the strength thereof is greatly reduced, and the texture thereof is decreased. If the content is more than 200 parts by weight, the viscosity is increased and the curing speed is delayed. It leads to degradation of the properties and mechanical properties of artificial marble.

In addition, the particle size of the inorganic filler is preferably 5 to 100 ㎛, when the particle size is smaller than 5 ㎛ light transmission performance of artificial marble is lowered, when larger than 100 ㎛ the physical properties of artificial marble is lowered There is a problem.

The crosslinkable monomer (crosslinking agent) used in the present invention is a polyfunctional acrylic monomer containing an intramolecular double bond, and is ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene Single or a mixture of two or more selected from glycol dimethacrylate, 1,6-hexanediol dimethacrylate, polybutylene glycol dimethacrylate, trimethylolpropane trimethacrylate and neopentylglycol dimethacrylate Among these, ethylene glycol dimethacrylate is particularly preferable. The content of the crosslinkable monomer is preferably 0.5 to 10 parts by weight based on 100 parts by weight of the styrene-methylmethacrylate resin solution. When the content is less than 0.5 parts by weight, there is a problem that the thermal properties and strength of the polymer is significantly lowered, and when the content is more than 10 parts by weight, there is a problem that cracks easily occur due to excessive heat generation during polymerization.

In the present invention, a polymerization initiator is used to effect polymerization and curing of the styrene-methylmethacrylate resin composition. The polymerization initiator is an organic peroxide, benzoyl peroxide, diacyl peroxide such as dicumyl peroxide, butylhydro peroxide, hydroperoxide such as cumylhydro peroxide, t-butyl peroxy maleic acid, t-butylhydro peroxide , Acetyl peroxide, lauroyl peroxide, azobisisobutyronitrile, azobisdimethylvaleronitrile alone or a mixture of two or more thereof. In addition, a mixture of peroxides and sulfonic acids of amines or mixtures of peroxides and cobalt compounds can be used to allow polymerization and curing to be carried out at room temperature. The content of the polymerization initiator is preferably 0.1 to 5 parts by weight based on 100 parts by weight of the styrene-methylmethacrylate resin solution, and is generally used together with the polymerization accelerator. When the content is less than 0.1 parts by weight, there is a problem that the curing speed is slow and sufficient curing does not occur. When the content is more than 5 parts by weight, the curing speed is delayed and partial uncuring may occur.

In the present invention, a chain transfer agent (radical carrier) used to control molecular weight is used, and the chain transfer agent is selected from a normal dodecyl mercaptan, a tertiary dodecyl mercaptan, benzyl mercaptan, and a trimethylbenzyl mercaptan. Mercaptan compounds are preferred. The content of the chain transfer agent is preferably 0.1 to 5 parts by weight based on 100 parts by weight of the styrene-methyl methacrylate resin solution. When the content is less than 0.1 parts by weight, there is no problem. There is a problem that the curing speed is significantly reduced and complete curing is not achieved.

In addition, the resin composition may be a silicone-based or non-silicone-based antifoaming agent as an additive component of commonly known artificial marble; Silane-based, acid-based or titanate-based coupling agents mainly composed of trimethoxysilane; Organic or inorganic pigments or dyes; Phenyl salicylate type, benzophenone type, benzotriazole type, nickel induction type or radical scavenger type ultraviolet absorber; Halogen-based, phosphorus- or inorganic metal-based flame retardants; Stearic acid type or silicone type release agent; Catechol-based or hydroquinone-based polymerization inhibitors; And one or more additives selected from phenolic, amine, quinone, sulfur or phosphorus antioxidants and heat stabilizers.

To prepare a transparent chip, first, a styrene-methyl methacrylate copolymer is added to a solvent of styrene, methyl methacrylate or a mixture thereof, and dissolved at 40 to 60 ° C. to prepare a styrene-methyl methacrylate resin solution. An inorganic filler, a crosslinkable monomer, a polymerization initiator, a chain transfer agent and other additives are added thereto and stirred well to prepare a resin composition.

At this time, in preparing the styrene-methyl methacrylate resin solution, dissolving the copolymer with only part of styrene, methyl methacrylate or a mixture thereof to prepare a syrup, and then adjusting the viscosity and styrene content in the syrup The remainder can be mixed and produced for the purpose.

Thereafter, the resin composition is defoamed and continuously fed to the movable steel belt. Preferred molding method in the present invention is a continuous casting molding method, the liquid resin mixture is supplied to the movable steel belt, the curing proceeds while the mixed liquid resin composition is continuously moved in accordance with the drive of the belt. As another curing method, the mixed slurry may be poured into a mold and placed in a hot air oven to cure.

At this time, the curing conditions are preferably carried out for 30 minutes to 2 hours at a temperature of 20 to 150 ℃. If the curing temperature is lower than 20 ℃, there is a problem that is difficult to cure, if the curing temperature is higher than 150 ℃ excessive volatilization of the monomer during polymerization and the problem of deformation and cracking of the polymer occurs, which is not preferable, the curing If the time is shorter than 30 minutes, excessive energy supply is required to cure, so the same problem may occur as if it is heated to 150 ° C. or more, and if it is longer than 2 hours, the inorganic filler and the particle pulverization are precipitated and productivity is increased. It is not preferable because there is a problem falling.

Next, the cured plate is put into a grinder and then pulverized to a predetermined size to prepare a transparent chip. In this case, the pulverizer uses a conventional stone grinding mill (hammer mill or cutter mill), and the particle size of the transparent chip is suitably in the range of 0.1 to 10 mm, preferably 2.0 to 6.0 mm. The transparent chip is manufactured in various sizes within the above range, and screened by size using a mesh net, and then used in combination for each size in the manufacture of artificial marble.

Next, to prepare an opaque chip containing an acrylic resin syrup and an inorganic filler. The opaque chip is the same as the composition of the transparent chip except for the base resin syrup, and the manufacturing method is the same. The acrylic resin syrup used for the opaque chip is composed of an acrylic resin monomer and / or an acrylic polymer, and is usually composed of a mixture of an acrylic monomer and a polymer.

As the polymerizable monomer of the acrylic resin syrup used in the present invention, an acrylic monomer is preferable. Specifically, the acrylic resin syrup is a methacrylate monomer selected from methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, benzyl methacrylate and glycidyl methacrylate alone or It is also a mixture of two or more kinds, and a mixture of a polymer in which a methacrylate monomer and a portion thereof are polymerized may be used. Of these, methyl methacrylate is particularly preferred. The content of the polymer in the syrup is preferably 10 to 50% by weight.

Next, the artificial marble plate is manufactured by applying the SMMA transparent chip and the acrylic opaque chip prepared above to the artificial marble raw material. At this time, the composition of the raw material is composed of an acrylic resin such as base resin syrup, inorganic filler, crosslinking agent, polymerization initiator, SMMA transparent chip and acrylic opaque chip, and the amount of SMMA transparent chip and acrylic opaque chip is added to 100 parts by weight of the base resin syrup. About 0.1-50 weight part each is suitable. In addition, artificial marble can be manufactured using only SMMA transparent chips and acrylic opaque chips.

Next, the artificial marble is cut to a predetermined size and then thermoformed into a predesigned form, or used as a sheet, and used as a front panel of a lighting fixture.

1 and 2 compare the light transmission effect of the artificial marble panel including the SMMA chip and the artificial marble panel including the UP chip as a comparative example, respectively, before and after the light transmission. What is dark in the figure is a transparent chip.

As can be seen in the drawings, the artificial marble panel using the SMMA chip according to the present invention showed an excellent light transmittance and a three-dimensional effect according to the equivalent than the artificial marble panel using the UP chip.

3 is a photograph comparing the thermoforming of the artificial marble panel including the SMMA chip and the artificial marble panel including the UP chip according to the present invention, the left side is a panel using the SMMA chip and the right side is Panel using UP chip.

Figure 4 is a photograph showing the thermoforming of the artificial marble panel including the SMMA chip according to the present invention, the bending process by the thermoforming was possible without any damage in accordance with the use of the SMMA chip having a thermoplastic characteristic.

5 is a photograph showing the thermoforming of the artificial marble panel including the UP chip as a comparative example, the damage of the panel due to the thermoforming (crack on the left side) occurred according to the use of the UP chip having the thermosetting characteristics.

6 and 7 are luminaires using artificial marble panels comprising SMMA chips according to the present invention, respectively, before and after light transmission. As can be seen in the drawings, the opaque acrylic chip and the transparent SMMA chip is mixed according to the present invention in the state that the lighting effect is not added to show the general artificial marble texture (FIG. 6), but when the lighting is added, it is opaque Three-dimensional effect according to the light transmittance difference between the acrylic chip and the transparent SMMA chip can be implemented (FIG. 7).

Hereinafter, the present invention will be described in detail with reference to Examples, but the scope of the present invention is not limited thereto.

EXAMPLE

1. Manufacturing of transparent chips

Styrene-methyl prepared by dissolving 25 parts by weight of MS 600 (styrene content 40 wt%, Shinil Iron Chemical, Japan) with a styrene-methylmethacrylate (SMMA) copolymer in a mixture of 45 parts by weight of methyl methacrylate and 30 parts by weight of styrene. 180 parts by weight of aluminum hydroxide, 3 parts by weight of diethylene glycol dimethacrylate, 1 part by weight of benzoyl peroxide (BPO), 0.1 part by weight of normaldodecyl mercaptan, and an antifoaming agent BYK 555 ( BYK-Chemie, Germany) 0.5 parts by weight, a resin composition by mixing 1 part by weight of BYK 900 (BYK-Chemie, Germany) as a coupling agent and 0.5 parts by weight of Hisorp-P (LG chemical) as a UV stabilizer (absorption). After preparing, casting was carried out while supplying to the continuous steel belt to prepare a flat plate of thickness 14mm, and then cured, and then put the cured plate into a mill and milled to prepare a transparent chip having a particle size of 0.1 to 10mm.

2. Manufacturing of opaque chips

180 parts by weight of aluminum hydroxide, 3 parts by weight of diethylene glycol dimethacrylate, benzoyl per 100 parts by weight of methyl methacrylate syrup consisting of a mixture of 30% by weight of polymethyl methacrylate and 70% by weight of methyl methacrylate 1 part by weight of oxide (BPO), 0.1 part by weight of normaldodecyl mercaptan, 0.5 part by weight of BYK 555 (BYK-Chemie, Germany) as an antifoaming agent, 1 part by weight of BYK 900 (BYK-Chemie, Germany) as a coupling agent, and After mixing 0.5 parts by weight of Hisorp-P (LG Chemistry) as a UV stabilizer (absorption agent) to prepare a resin composition, and casting it while supplying to a continuous steel belt to prepare a 14 mm thick flat plate to cure, and then cured After the pulverizer was added to the crusher to prepare an opaque chip having a particle size of 0.1 to 10 mm.

3. Artificial Marble Manufacturing

100 parts by weight of methyl methacrylate syrup consisting of a mixture of 28% by weight of polymethyl methacrylate and 72% by weight of methyl methacrylate, 160 parts by weight of aluminum hydroxide, 0.2 parts by weight of t-butyl peroxy neodecanoate, 0.3 parts by weight of t-amyl peroxy 2-ethyl hexanoate, 3 parts by weight of ethylene glycol dimethacrylate, 0.2 parts by weight of normaldodecyl mercaptan, 0.2 part by weight of BYK 555 (BYK-Chemie, Germany) as an antifoaming agent, 0.75 parts by weight of BYK 900 (BYK-Chemie Co., Germany) as a coupling agent, 0.2 parts by weight of Hisorp-P (LG Chemistry) as a UV stabilizer (absorption), 20 parts by weight of transparent chips, 20 parts by weight of opaque chips After preparing the artificial marble slurry by molding and hardening in a continuous molding steel belt to produce a 14 mm thick plate, and then polished the top surface 1 mm, the bottom surface 2 mm thickness artificial marble of natural stone texture was made. .

4. Manufacture of lighting fixtures

Using the artificial marble prepared above as a front panel to produce a lighting fixture as shown in Figs.

Comparative Example 1

Except for the use of methyl methacrylate syrup consisting of a mixture of 25% by weight of polymethyl methacrylate (PMMA) and 75% by weight of methyl methacrylate instead of styrene-methyl methacrylate resin syrup in the preparation of the transparent chip. Artificial marble was prepared in the same manner as in Example.

Comparative Example 2

Unsaturated poly consisting of a mixture of 14.3 wt% methyl methacrylate and 85.7 wt% unsaturated polyester (UP) resin (M-900, Sewon Hwa, Korea) instead of styrene-methyl methacrylate resin syrup in the manufacture of transparent chips An artificial marble was prepared in the same manner as in Example, except that the ester resin syrup was used.

[Test Example]

For the artificial marble prepared in Examples and Comparative Examples, the transparency, heat discoloration, weather resistance, and heat deformation temperature of the transparent chip were measured by the following evaluation method, and the results were compared with Table 1 below.

1.Transparency (%)

Transparency was measured using a haze meter (Haze meter, Murakami Color Research Laboratory, Japan) of 2 mm thick cured product. The higher the measurement, the more transparent.

2. Heat discoloration (△ E)

After leaving the artificial marble specimen at 170 ° C. for 1 hour, ΔE was measured using a color difference meter. The smaller the color difference, the better the heat discoloration resistance.

3. Weather resistance (△ E)

After the accelerated weathering test was performed using a QUV tester according to ASTM G-53, ΔE was measured using a colorimeter. The smaller the color difference, the better the weather resistance.

4. Heat deflection temperature (℃)

It was measured according to ASTM D 648. The higher the temperature, the better the thermal deformation.

polymer transparency(%) Heat discoloration (△ E) Weather resistance (△ E) Heat deflection temperature (℃) Example SMMA 45 0.67 2.5 102 Comparative Example 1 PMMA 18 0.17 1.8 106 Comparative Example 2 UP 48 4.68 7.3 94

According to Table 1, the SMMA chip of the embodiment shows the same level of transparency as the UP chip of Comparative Example 2, in harmony with the acrylic opaque chip in the artificial marble was implemented a three-dimensional effect according to the difference in the mutual transmittance. However, in Comparative Example 1, the transparency of the PMMA chip was not distinguished from the opaque chip. In Comparative Example 2, although the transparency of the UP chip was excellent, cracks occurred as shown in FIG. 5 due to thermosetting properties. Heat discoloration and weather resistance also decreased significantly.

The artificial marble of the present invention is a mixture of opaque acrylic chip and transparent SMMA chip shows the texture of the general artificial marble in the state that the lighting effect is not added, but when the lighting is added, the three-dimensional effect according to the light transmittance difference can be realized. In particular, due to the thermoplastic properties, it is possible to integrally mold by heat, thereby manufacturing interior lighting equipment not only in two dimensions but also in three dimensions.

Claims (11)

(a) a transparent chip containing a styrene-methyl methacrylate copolymer and an inorganic filler; And (b) an opaque chip containing acrylic resin syrup and an inorganic filler, The total light transmittance of the transparent chip is 40 to 60%, the total light transmittance of the opaque chip is 10 to 30%, The transparent chip is 100 parts by weight of a styrene-methyl methacrylate resin solution comprising a styrene-methyl methacrylate copolymer and styrene, methyl methacrylate or a mixture thereof; And including an inorganic filler 100 to 200 parts by weight, The styrene-methyl methacrylate resin solution is 10 to 50 parts by weight of styrene-methyl methacrylate copolymer; And 50 to 90 parts by weight of styrene, methyl methacrylate or a mixture thereof, The styrene-methyl methacrylate resin solution is artificial marble, characterized in that it contains 10 to 70 parts by weight of styrene. delete delete delete delete The artificial marble according to claim 1, wherein the inorganic filler is at least one selected from aluminum hydroxide, magnesium hydroxide and calcium aluminate. The artificial marble according to claim 1, wherein the inorganic filler has a particle size of 5 to 100 µm. (a) preparing a flat plate containing a styrene-methyl methacrylate copolymer and an inorganic filler and then grinding the flat plate to prepare a transparent chip; (b) preparing an opaque chip by preparing a plate containing acrylic resin syrup and an inorganic filler and then grinding the plate; And (c) applying the transparent chip and the opaque chip as an artificial marble raw material, The total light transmittance of the transparent chip is 40 to 60%, the total light transmittance of the opaque chip is 10 to 30%, The transparent chip is 100 parts by weight of a styrene-methyl methacrylate resin solution comprising a styrene-methyl methacrylate copolymer and styrene, methyl methacrylate or a mixture thereof; And including an inorganic filler 100 to 200 parts by weight, The styrene-methyl methacrylate resin solution is 10 to 50 parts by weight of styrene-methyl methacrylate copolymer; And 50 to 90 parts by weight of styrene, methyl methacrylate or a mixture thereof, The styrene-methyl methacrylate resin solution is a method for producing artificial marble, characterized in that it contains 10 to 70 parts by weight of styrene. (a) a transparent chip containing a styrene-methyl methacrylate copolymer and an inorganic filler; And (b) an artificial marble comprising an opaque chip containing acrylic resin syrup and an inorganic filler, The total light transmittance of the transparent chip is 40 to 60%, the total light transmittance of the opaque chip is 10 to 30%, The transparent chip is 100 parts by weight of a styrene-methyl methacrylate resin solution comprising a styrene-methyl methacrylate copolymer and styrene, methyl methacrylate or a mixture thereof; And including an inorganic filler 100 to 200 parts by weight, The styrene-methyl methacrylate resin solution is 10 to 50 parts by weight of styrene-methyl methacrylate copolymer; And 50 to 90 parts by weight of styrene, methyl methacrylate or a mixture thereof, The styrene-methyl methacrylate resin solution contains 10 to 70 parts by weight of styrene. delete 10. The luminaire of claim 9, wherein said artificial marble is used as a front panel.

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