WO2019027138A1 - Resin composition for engineered stone and engineered stone formed therefrom - Google Patents

Abstract

A resin composition for engineered stone according to the present invention is characterized by comprising: a matrix resin; an inorganic aggregate; and zinc oxide which has an average particle size of approximately 0.8 to approximately 3 µm, and in which the size ratio (B/A) between a 450 to 600 nm region peak B and a 370 to 390 nm region peak A as measured by photoluminescence is approximately 0.01 to approximately 1.0. The resin composition for engineered stone has excellent weather resistance and antibacterial properties.

Description

Resin composition for engineered stone and engineered stone formed therefrom

The present invention relates to an engineered stone resin composition and engineered stone formed therefrom. More specifically, the present invention relates to a resin composition for engineered stones excellent in weatherability, antibacterial properties, and engineering stones formed therefrom.

Natural stones such as granite and marble have been used as decorative materials since ancient times because of their beautiful surface patterns. Natural stone is a material showing high-quality texture, and its demand has been greatly increased in the fields of flooring, wall, and sink top plate. However, since expensive natural stone can not meet the demand, various kinds of artificial stones are being developed.

Among such artificial stones, engineered stone (resin-reinforced natural stone) is a resin composition obtained by mixing a natural mineral and a binder resin under compression or vibration or under vacuum / vibration conditions, thereby showing the texture of natural stone. Engineered stones may be prepared to have a multicolor tone by being produced in a single color, or by blending a resin mixture with each of the pigments of different colors added thereto in a mixer, or using a chip to have a natural stone texture. In addition, engineered stones can be manufactured to exhibit various colors and textures according to mixed natural minerals, kinds of binder resins, color of pigment, stirring process, etc., and natural stone is used as a main material, , And hardness.

However, existing engineered stones have not been solved with problems such as deterioration in weatherability, and they have been used only for exterior materials very limitedly.

Therefore, there is a need for the development of a resin composition for engineered stones and engineered stones capable of improving weather resistance and the like without deteriorating mechanical properties and the like.

The background art of the present invention is disclosed in Korean Patent Publication No. 10-2011-0052425.

An object of the present invention is to provide a resin composition for engineered stones excellent in weatherability, antibacterial properties and the like.

Another object of the present invention is to provide an engineered stone formed from the resin composition for engineering stone.

The above and other objects of the present invention can be achieved by the present invention described below.

One aspect of the present invention relates to a resin composition for engineered stones. The resin composition comprises a matrix resin; Inorganic aggregate; (B / A) of the peak A in the region of 370 to 390 nm and the peak B in the region of 450 to 600 nm is about 0.01 to about 3 mu m, and the average particle size is about 0.8 to about 3 mu m. In the photoluminescence measurement, ≪ / RTI > to about < RTI ID = 0.0 > 1.0. ≪ / RTI >

In an embodiment, the resin composition comprises about 5 to about 20 weight percent of the matrix resin; About 40 to about 94 wt% of said inorganic aggregate; And from about 0.1 to about 10 weight percent of the zinc oxide.

In embodiments, the weight ratio of the matrix resin and the inorganic aggregate may be from about 1: about 5 to about 1: about 18.

In embodiments, the weight ratio of the zinc oxide and the inorganic aggregate may be from about 1: about 30 to about 1: about 500.

In a specific example, the matrix resin may include at least one of a polyester resin, an acrylic resin, an epoxy resin, and a polyurethane resin.

In an embodiment, the matrix resin may be an unsaturated polyester resin.

In an embodiment, the inorganic aggregate may be a silica-based natural mineral.

In an embodiment, the inorganic aggregate may include at least one of a silica sand, a quartz chip, and a silica powder.

In embodiments, the inorganic aggregate may comprise about 20 to about 75 weight percent silica sand, about 0.1 to about 40 weight percent quartz chip, and about 20 to about 40 weight percent silica powder.

In an embodiment, the resin composition may further include at least one of a curing agent, a curing accelerator, a silane coupling agent, and a pigment.

In the specific example, the resin composition is prepared by measuring the initial color (L ₀ ^* , a ₀ ^* , b ₀ ^* ) using a colorimeter for a 50 mm × 90 mm × 3 mm size injection sample, (L ₁ ^* , a ₁ ^* , b ₁ ^* ) after the test was measured using a colorimeter, and then the color change (ΔE ) Can be from about 2 to about 7:

[Formula 1]

Color change (ΔE) =

In the formula 1, ΔL ^* is a difference (L ₁ ^* -L ₀ ^*) in the L ^* values before and after the test, Δa ^* is the difference between _{^{(a 1 * - a 0 *}} ) of the a ^* values before and after the test and, Δb ^* Is the difference (b ₁ ^* - b ₀ ^* ) between the values of b ^* before and after the test.

Another aspect of the present invention relates to engineered stones formed from the resin composition for Engineered Stone.

INDUSTRIAL APPLICABILITY The present invention has the effect of providing an engineered stone resin composition excellent in weatherability, antibacterial properties and the like and engineered stone formed therefrom.

Hereinafter, the present invention will be described in detail.

The resin composition for engineered stone according to the present invention comprises (A) a matrix resin; (B) inorganic aggregate; And (C) zinc oxide.

(A) Matrix resin

As the matrix resin according to one embodiment of the present invention, a matrix resin used for engineering stone (resin-reinforced natural stone) known in the art can be used without limitation. For example, an (unsaturated) polyester resin, an acrylic resin, an epoxy resin, a polyurethane resin, a combination thereof, or the like can be used. Specifically, an unsaturated polyester resin or an acrylic resin can be used.

In an embodiment, the (unsaturated) polyester resin may be prepared by condensation reaction of an alpha, beta -unsaturated dibasic acid or a mixture of the dibasic acid and a saturated dibasic acid with a polyhydric alcohol. For example, the polyester resin may be prepared by mixing the dibasic acid or the like with a polyhydric alcohol in a specific ratio (for example, alcoholic hydroxyl group mols / carboxyl group mols = about 0.8 to about 1.2) In an inert gas stream at a temperature of about 140 ° C to about 250 ° C to remove the product water while gradually raising the temperature in accordance with the progress of the reaction, but the present invention is not limited thereto.

Examples of the?,? - unsaturated dibasic acids and saturated dibasic acids include maleic anhydride, citraconic acid, fumaric acid, itaconic acid, phthalic acid, , Phthalic anhydride, isophthalic acid, terephthalic acid, succinic acid, aipic acid, sebacic acid, tetrahydrophthalic acid, and combinations thereof. And polyhydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, 1,3-butylene glycol, hydrogenated bisphenol-A, neopentyl glycol, 2,2,4-trimethyl-1,3-pentanediol, glycerin, combinations of these, and the like. The polyester resin may be a monobasic acid such as acrylic acid, propionic acid or benzoic acid; Or a polybasic acid such as trimellitic acid, tetracarboxylic acid of benzol, and the like.

In embodiments, the polyester-based resin may have a weight average molecular weight, as measured by gel permeation chromatography (GPC), of from about 1,000 to about 10,000 g / mol, such as from about 1,500 to about 4,000 g / mol. Within the above range, the resin composition for engineered stone can have excellent processability and the like.

In an embodiment, the acrylic resin is a polymer of a (meth) acrylic monomer such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl But are not limited to, polymers of monomers (blends), including but not limited to, benzyl (meth) acrylate, glycidyl (meth) acrylate, combinations thereof and the like.

In embodiments, the acrylic resin may have a weight average molecular weight, as measured by gel permeation chromatography (GPC), of from about 10,000 to about 150,000 g / mol, such as from about 30,000 to about 100,000 g / mol. Within the above range, the resin composition for engineered stone can have excellent processability and the like.

As the epoxy resin, a bisphenol-A type epoxy resin, a bisphenol-S type epoxy resin, a tetraphenyl ethane epoxy resin, a phenol novolak type epoxy resin, a mixture thereof and the like can be used, but the present invention is not limited thereto.

In embodiments, the matrix resin may comprise from about 5 to about 20 weight percent, such as from about 6 to about 13 weight percent, specifically from about 7 to about 10 weight percent, of 100 weight percent of the total resin composition. Within the above range, the engineered stone resin composition can be excellent in fluidity and the like, and an engineered stone excellent in workability, appearance (color, etc.) can be obtained.

(B) Inorganic aggregate

The inorganic aggregate according to one embodiment of the present invention is capable of exhibiting the appearance and texture of natural stone, and inorganic aggregate used in known engineering stone (resin-reinforced natural stone) can be used without limitation.

In an embodiment, the inorganic aggregate may include silica-based natural minerals such as silica sand, quartz chip, silica powder, combinations thereof, and the like.

In an embodiment, the inorganic aggregate comprises about 20% to about 75% by weight of the silica sand, such as about 30% to about 55% by weight of the silica sand, about 0.1% to about 40% by weight of the quartz chip, About 7 to about 20 weight percent of the silica powder and about 20 to about 40 weight percent of the silica powder, such as about 20 to about 28 weight percent. It is possible to obtain a resin composition for engineered stone capable of realizing the appearance and texture closer to natural stone in the above range.

In embodiments, the silica sand may have an average particle size as measured by a sieving method (apparatus) of about 0.1 to about 1.5 mm, such as about 0.1 to about 1.2 mm, and the quartz chip has an average particle size From about 0.5 to about 10 mm, such as from about 1.3 to about 9 mm, and the silica powder may have an average particle size of from about 5 to about 50 microns, for example from about 10 to about 45 microns. It is possible to obtain a resin composition for engineered stone which can be easily mixed with the matrix resin in the above range, can prevent the occurrence of pores when mixed with the matrix resin, and can realize appearance and texture close to natural stone.

In embodiments, the inorganic aggregate may have a Mohs hardness of greater than about 3 to about 9, such as from about 6 to about 8. Within the above range, the surface hardness, workability, crack resistance and the like of engineered stone can be excellent.

In embodiments, the inorganic aggregate may comprise from about 40 to about 94 weight percent, such as from about 75 to about 90 weight percent, specifically from about 80 to about 90 weight percent, of 100 weight percent of the total resin composition. Within the above range, the engineered stone resin composition can be excellent in fluidity and the like, and an engineered stone excellent in workability, appearance (color, etc.) can be obtained.

In an embodiment, the weight ratio (A) :( B) of the matrix resin (A) and the inorganic aggregate (B) is about 1: about 5 to about 1: about 18, About 1: about 15, specifically about 1: about 7 to about 1: about 14. It is possible to obtain an engineered stone having better processability, appearance characteristics and the like in the above range.

(C) Zinc oxide

The zinc oxide according to one embodiment of the present invention is capable of improving the weather resistance and antibacterial property of the resin composition for engineered stone and has an average particle size (D50) measured by a particle size analyzer of about 0.8 to about 3 탆, for example, (B / A) of the peak A in the region of 370 to 390 nm and the peak B in the region of 450 to 600 nm is in the range of about 0.01 to about 1.0 < RTI ID = 0.0 > , For example from about 0.1 to about 1.0, specifically from about 0.2 to about 0.8. If the size ratio (B / A) of the peak A and the peak B of the zinc oxide is less than about 0.01, the antibacterial property of the resin composition may be deteriorated. If the ratio B / A is more than about 1.0, There is a concern.

In embodiments, the zinc oxide may have a specific surface area BET of less than or equal to about 10 m ² / g, such as from about 1 to about 7 m ² / g, and a purity of greater than or equal to about 99%. Within the above range, the mechanical properties and discoloration resistance of the resin composition may be excellent. In addition, when zinc oxide having a BET surface area of more than about 10 m ² / g is applied, the intended weatherability of the present invention can not be secured.

In an embodiment of the present invention, the zinc oxide has a peak position 2θ value in the range of 35 to 37 ° in X-ray diffraction (XRD) analysis, and the measured FWHM value (Full of diffraction peak the crystallite size value calculated by applying Scherrer's equation (equation 2) based on the width at half maximum may be about 1,000 to about 2,000 A, for example, about 1,200 to about 1,800 A. Within the above range, the resin composition may be excellent in initial color, weather resistance (discoloration resistance), antimicrobial property, mechanical property balance thereof and the like.

[Formula 2]

Microcrystalline size (D) =

In the formula 2, K is a shape factor,? Is an X-ray wavelength,? Is an FWHM value (degree) of an X-ray diffraction peak,? Is a peak position value (peak position degree).

In embodiments, the zinc oxide may be prepared by melting zinc in the form of a metal and then heating to about 850 to about 1000 캜, such as about 900 to about 950 캜, And then heating at about 400 to about 900 DEG C, for example, about 500 to about 800 DEG C for about 30 to about 150 minutes, for example, about 60 to about 120 minutes.

In embodiments, the zinc oxide may comprise from about 0.1 to about 10 weight percent, for example, from about 0.3 to about 5 weight percent, specifically from about 0.5 to about 2 weight percent, of 100 weight percent of the total resin composition. In the above range, the weatherability and antimicrobial property for engineering stone can be excellent.

In an embodiment, the weight ratio (C) :( B) of the zinc oxide (C) and the inorganic aggregate (B) is about 1: about 30 to about 1: about 500, About 1: about 300, specifically about 1: about 40 to about 1: about 200. It is possible to obtain engineered stones having better weatherability, antibacterial properties, processability, appearance, balance of physical properties, and the like in the above range.

The resin composition for engineered stones according to one embodiment of the present invention may further include additives including a curing agent, a curing accelerator, a silane coupling agent, a pigment, a mineral, and combinations thereof.

As the additive, additives known in the resin composition for engineering stone (resin-based natural reinforcing stone composition) can be used without limitation. For example, the curing agent may be t-butyl peroxy benzoate (TBPB), methyl ethyl ketone peroxide (MEKPO) or a combination thereof. As the pigment, a reddish brown pigment such as iron oxide, a yellow pigment such as iron hydroxide, a green pigment such as chromium oxide, an azure blue pigment such as sodium aluminosilicate, a white pigment such as titanium oxide, Pigments, black pigments such as carbon black, azo pigments, phthalocyanine pigments, etc., and pearl can be further added and used, but the present invention is not limited thereto.

The mineral may be talc (talc), gypsum, calcite, combinations thereof and the like, preferably talc, which can improve the crack resistance of engineered stones.

In embodiments, the mineral has a Mohs hardness of from about 1 to about 3 and an average particle size as measured by a particle size analyzer of from about 1 to about 50 microns, such as from about 5 to about 45 microns. In the above range, the surface hardness and crack resistance of engineered stone can be excellent.

When the additive is used, it is not particularly limited as long as it does not deteriorate the physical properties of the present invention. For example, about 0.1 to about 30 parts by weight may be included per 100 parts by weight of the matrix resin.

In the resin composition for engineered stone according to one embodiment of the present invention, the initial color (L ₀ ^* , a ₀ ^* , b ₀ ^* ) is measured using a colorimeter for a 50 mm × 90 mm × 3 mm size injection sample , The injection specimen was subjected to weather resistance test for 3,000 hours in accordance with SAE J 1960 and the color (L ₁ ^* , a ₁ ^* , b ₁ ^* ) after the test was measured using a colorimeter, The calculated color change ([Delta] E) may be from about 2 to about 7, for example from about 2 to about 5. [ The weatherability of engineered stone can be excellent in the above range.

[Formula 1]

Color change (ΔE) =

In the formula 1, ΔL ^* is a difference (L ₁ ^* -L ₀ ^*) in the L ^* values before and after the test, Δa ^* is the difference between _{^{(a 1 * - a 0 *}} ) of the a ^* values before and after the test and, Δb ^* Is the difference (b ₁ ^* - b ₀ ^* ) between the values of b ^* before and after the test.

The engineered stone according to the present invention is formed from the resin composition for engineered stone. For example, the resin composition may be prepared (molded) according to a known engineering stone manufacturing method using the resin composition. Specifically, the respective components of the resin composition may be mixed (agitated), compression molded and cured under vibration or vacuum / vibration conditions, and then, if necessary, surface polished. Since such a process is well known, a detailed description thereof will be omitted.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

Example

Hereinafter, specifications of each component used in Examples and Comparative Examples are as follows.

(A) Matrix resin

An unsaturated polyester resin having a weight average molecular weight of 2,500 g / mol (manufacturer: Aekyung Chemical Co., Ltd., product name: ATM100) was used.

(B) Inorganic aggregate

(B1) silica sand (manufactured by Microman, average particle size: 0.6 mm) was used.

(B2) quartz chip (manufacturer: 21st century silica, average particle size: 4 mm) was used.

(B3) silica powder (manufacturer: 21st century silica, average particle diameter: 10 mu m) was used.

(C) Zinc oxide

(C1) After dissolving zinc in the form of metal, it was heated to 900 DEG C and vaporized. Then, oxygen gas was introduced and cooled to room temperature (25 DEG C) to obtain a primary intermediate. Next, zinc oxide prepared by cooling the primary intermediate at 700 DEG C for 90 minutes and then cooled to room temperature (25 DEG C) was used.

(C2) zinc oxide (manufacturer: Ristec Biz, product name: RZ-950) was used.

(C3) zinc oxide (manufacturer: Wako pure chemical, product name: 264-00365) was used.

The ratio of the peak A in the region of 370 to 390 nm and the peak B of the region of 450 to 600 nm in the range of 370 to 390 nm in the measurement of the average particle size, the BET surface area, the purity, and the photo luminescence of the zinc oxide (C1, B / A) and the crystallite size were measured and are shown in Table 1 below.

	(C1)	(C2)	(C3)
Average particle size (占 퐉)	1.2	1.1	1.3
BET surface area (m 2 / g)	4	15	5
Purity (%)	99	97	99
PL size ratio (B / A)	0.28	9.8	0.0016
The crystallite size (A)	1,417	503	1,870

How to measure property

(1) Average particle size (unit: 占 퐉): The average particle size (volume average) was measured using a particle size analyzer (Beckman Coulter Laser Diffraction Particle Size Analyzer LS I3 320 instrument).

(2) BET surface area (unit: m ² / g): The BET surface area was measured with a BET analyzer (Micromeritics Surface Area and Porosity Analyzer ASAP 2020 instrument) using a nitrogen gas adsorption method.

(3) Purity (unit:%): Purity was measured using TGA thermal analysis at a temperature of 800 ° C.

(4) PL size ratio (B / A): Spectra emitted from a He-Cd laser (KIMMON company, 30 mW) at a wavelength of 325 nm at room temperature was irradiated to the sample according to a photoluminescence , And the temperature of the CCD detector was maintained at -70 ° C. (B / A) of the peak A in the 370 to 390 nm region and the peak B in the 450 to 600 nm region was measured. The injection specimen was subjected to PL analysis by injecting a laser into the specimen without any additional treatment. The zinc oxide powder was placed in a pelletizer having a diameter of 6 mm and pressed to form a flat specimen. Respectively.

(5) Crystallite size (unit: Å): A high resolution X-ray diffractometer (manufacturer: X'pert, device name: PRO-MRD) position 2θ value is in the range of 35 to 37 ° and is applied to the Scherrer's equation based on the measured FWHM value (full width at half maximum of the diffraction peak). In this case, both the powder shape and the injection specimen can be measured. For the more accurate analysis, the injection specimen was subjected to heat treatment at 600 ° C. and air for 2 hours to remove the polymer resin, and then XRD analysis was carried out.

[Formula 2]

Microcrystalline size (D) =

In the formula 2, K is a shape factor,? Is an X-ray wavelength,? Is an FWHM value (degree) of an X-ray diffraction peak,? Is a peak position value (peak position degree).

Example  1 to 3 and Comparative Example  1 to 3

(A) a matrix resin, (B) an inorganic aggregate and (C) zinc oxide were mixed according to the composition and content of the following Table 2, and 100 parts by weight of a curing agent (t-butylperoxybenzoate 1 part by weight of a silane coupling agent (trade name: Gudam, product name: WD-70) and 2 parts by weight of a curing accelerator (TBPB manufactured by Centaial Inc.), 0.2 parts by weight of a curing accelerator (6% cobalt-octoate, And 5 parts by weight of a pigment (TiO ₂ , manufactured by WASIN PIGMENT, product name: HUNTSMAN TR92) were added and mixed to obtain a resin composition for Engineered Stone. Next, the resin composition was put into a mold having a size of 300 mm x 300 mm x 100 mm, and the mold was vibrated for 2 minutes by up-and-down vibration at a motor speed of 3,600 rpm, and a pressure of 2 to 3 bar, , And the resin was cured at 90 DEG C for 1 hour to prepare an engineered stone. The weatherability and antimicrobial activity of the engineered stone thus produced were evaluated and are shown in Table 2 below.

Property evaluation method

(L ₀ ^* , a ₀ ^* , b ₀ ^* ) was measured using a colorimeter for an injection sample of 50 mm × 90 mm × 3 mm in size, The injection specimen was subjected to weather resistance test for 3,000 hours in accordance with SAE J 1960 and the color (L ₁ ^* , a ₁ ^* , b ₁ ^* ) after the test was measured using a colorimeter, The change (? E) was calculated.

[Formula 1]

Color change (ΔE) =

In the formula 1, ΔL * is a difference (L ₁ ^* -L ₀ ^*) in the L ^* values before and after the test, Δa ^* is the difference between ^{_{(a 1 * - a 0 *}} ) of the a ^* values before and after the test and, Δb ^* Is the difference (b ₁ ^* - b ₀ ^* ) between the values of b ^* before and after the test.

(2) Antibacterial activity value: Staphylococcus aureus and E. coli were inoculated on a 5 cm x 5 cm specimen according to JIS Z 2801 antibacterial evaluation method, and cultured at 35 ° C and RH 90% for 24 hours. Respectively.

[Formula 3]

Antibacterial activity = log (M1 / M2)

In the above formula (3), M1 is the number of bacteria after 24 hours of incubation for the blank specimen, and M2 is the number of bacteria after 24 hours of incubation for the resin composition specimen.

(3) Flexural strength (unit: MPa): Measured by applying ASTM D790-07E1 method.

(4) Evaluation of scratch resistance: The surface of a specimen was polished for 3 minutes with a grinding stone of # 50 to # 2500 standard using a grinder (manufacturer: Sung Chang Machinery Co., Ltd.), and whether scratches were generated on the surface of the specimen Respectively. If more than one scratch occurs, it is indicated as inappropriate, if not, scratches do not occur.

		Example			Comparative Example
		One	2	3	One	2	3
(A) (% by weight)		10	10	10	10	10	10
(B) (% by weight)	(B1)	50	50	50	50	50	50
	(B2)	13	13	13	13	13	13
	(B3)	26.5	26	25	26	26	26
(C) (% by weight)	(C1)	0.5	One	2	-	-	-
	(C2)	-	-	-	One	-	-
	(C3)	-	-	-	-	One	-
Color change (ΔE)		3.2	2.5	2.4	8.5	9.1	9.0
The antibacterial activity value (E. coli)		5.7	6.3	6.3	6.3	6.3	0.3
Antibacterial activity value (Staphylococcus aureus)		4.6	4.6	4.6	4.6	4.6	0.2
Flexural Strength (MPa)		86	85	84	67	84	86
Scratch resistance		fitness	fitness	fitness	fitness	incongruity	fitness

From the above results, it can be seen that the engineered stone resin composition and engineered stone of the present invention (Examples 1 to 3) are excellent in weather resistance, antibacterial property, flexural strength, scratch resistance and the like.

On the other hand, in the case of Comparative Example 1 in which zinc oxide (C2) having a size ratio (B / A) of peaks A and B of greater than 1.0 (9.8) was measured during photoluminescence measurement of zinc oxide, weatherability, And in Comparative Example 2 using zinc oxide (C3) having a size ratio (B / A) of less than 0.01 (0.0016), the weather resistance, scratch resistance and the like are reduced. Further, in Comparative Example 3 in which zinc oxide was not used, it was found that the weather resistance and antibacterial property were lowered.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (12)

1. Matrix resin;

   Inorganic aggregate; And

   (B / A) of the peak A in the region of 370 to 390 nm and the peak B in the region of 450 to 600 nm is in the range of about 0.01 to about 3 mu m, and the average particle size is in the range of about 0.8 to about 3 mu m. In the photoluminescence measurement, Wherein the resin composition contains zinc oxide of about 1.0.
2. The resin composition for engineered stone according to claim 1, wherein the resin composition comprises about 5 to about 20% by weight of the matrix resin; About 40 to about 94 wt% of said inorganic aggregate; And about 0.1 to about 10% by weight of the zinc oxide.
3. The resin composition for engineered stone according to claim 1, wherein the weight ratio of the matrix resin and the inorganic aggregate is about 1: about 5: about 1: about 18.
4. The resin composition for engineered stone according to claim 1, wherein the weight ratio of the zinc oxide and the inorganic aggregate is about 1: about 30 to about 1: 500.
5. The resin composition for engineered stones according to claim 1, wherein the matrix resin comprises at least one of a polyester resin, an acrylic resin, an epoxy resin, and a polyurethane resin.
6. The resin composition for engineered stones according to claim 1, wherein the matrix resin is an unsaturated polyester resin.
7. The resin composition for engineered stone according to claim 1, wherein the inorganic aggregate is a silica-based natural mineral.
8. The resin composition for engineered stone according to claim 1, wherein the inorganic aggregate comprises at least one of silica sand, quartz chips and silica powder.
9. The engineered stone resin composition according to claim 8, wherein the inorganic aggregate comprises about 20 to about 75 wt% of a silica sand, about 0.1 to about 40 wt% of a quartz chip, and about 20 to about 40 wt% Composition.
10. The resin composition for engineered stones according to claim 1, wherein the resin composition further comprises at least one of a curing agent, a curing accelerator, a silane coupling agent and a pigment.
11. The injection molding method as claimed in claim 1, wherein the resin composition has a colorimetric system for measuring an initial color (L ₀ ^* , a ₀ ^* , b ₀ ^* ) of an injection sample having a size of 50 mm × 90 mm × 3 mm, (L ₁ ^* , a ₁ ^* , b ₁ ^* ) after the test using a colorimeter, and then the color change calculated according to the following formula (1) was measured according to SAE J 1960 for 3,000 hours, (? E) of from about 2 to about 7.

    [Formula 1]

    Color change (ΔE) =

    

    In the formula 1, ΔL ^* is a difference (L ₁ ^* -L ₀ ^*) in the L ^* values before and after the test, Δa ^* is the difference between _{^{(a 1 * - a 0 *}} ) of the a ^* values before and after the test and, Δb ^* Is the difference (b ₁ ^* - b ₀ ^* ) between the values of b ^* before and after the test.
12. 11. An engineered stone formed from the resin composition for engineered stone according to any one of claims 1 to 11.