KR20210129846A - Engineered stone including quartz pretreated with silane-based coupling agent and method of preparing same - Google Patents

Abstract

The present application relates to an engineered stone including quartz pretreated with a silane-based coupling agent and a manufacturing method thereof. The present application improves bonding strength between an inorganic material and an organic material.

Description

Engineered stone containing quartz pretreated with a silane-based coupling agent and manufacturing method thereof

The present application relates to an engineered stone including quartz pretreated with a silane-based coupling agent and a manufacturing method thereof.

Artificial marble is made by mixing synthetic resins such as acrylic resins, unsaturated polyester resins, and epoxy resins, or additives such as natural stone powder, particles or chips in the form of minerals and resin chips to a base such as cement, and, if necessary, additives such as pigments. It is an artificial synthetic material that embodies the texture of natural stone by adding

Representative types of artificial marble include acrylic artificial marble, polyester-based artificial marble, epoxy-based artificial marble, melamine-based artificial marble, and engineered stone (E-Stone)-based artificial marble.

Since such artificial marble has a texture and feel close to natural stone, it is mainly applied to exterior materials such as interior floor and wall decoration, kitchen top, and bathroom sink.

In particular, E-Stone artificial marble is a plate-type artificial marble made by compacting a mixture of quartz aggregate and unsaturated polyester (UPE) resin in a vacuum-vacuum-compression process and then thermosetting. am.

At this time, in order to increase the bonding force between the quartz aggregate and the resin, a silane coupling agent is sometimes used. The silane-based coupling agent acts as a coupling agent that increases bonding strength with inorganic materials (glass, metal, sand, etc.). The mechanism of action of the silane-based coupling agent is that a methoxy group or an alkoxy group undergoes a hydration reaction to form a hydrogen bond to the inorganic aggregate in the form of silanol to have bonding strength, and then form an organic film of siloxane and react or compatibility with organic materials. Due to this good reaction, a method of increasing the interfacial bonding force between inorganic materials and organic materials is adopted.

According to an embodiment of the present application, it is an object of the present application to provide an engineered stone that is compression-molded by mixing quartz and a thermosetting resin pretreated with a silane coupling agent for improving bonding strength between an inorganic material and an organic material, and a method for manufacturing the same.

One aspect of the present application provides a method of manufacturing an engineered engineered stone.

The manufacturing method includes the steps of pre-treating quartz with a silane-based coupling agent; forming a mixture by mixing quartz and unsaturated polyester pretreated with the silane-based coupling agent; and compression molding the mixture.

In one example, the component ratio of the unsaturated polyester and quartz may be 5 to 15 parts by weight: 95 to 85 parts by weight.

In one example, the flexural strength of the engineered stone may be 65 to 90 MPa.

According to an embodiment of the present application, the reaction rate of the coupling agent can be improved because the resin penetrates in a state sufficiently combined with the aggregate through pretreatment.

According to an embodiment of the present application, it is possible to reduce the defect rate due to pin-holes.

According to an embodiment of the present application, an engineered stone having excellent mechanical properties may be provided.

1 is a flowchart for a method of manufacturing an engineered stone according to an embodiment of the present application.
Figure 2 is an image taken of the surface of the engineered stone according to Example 1 of the present application.
3 is an image of the surface of the engineered stone according to Comparative Example 1.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that the features, components, etc. described in the specification are present, and one or more other features or components may not be present or may be added. Doesn't mean there isn't.

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

In the present application, the term “nano” may mean a size of nanometers (nm), for example, may mean a size of 1 to 1,000 nm, but is not limited thereto. In addition, in the present specification, the term "nanoparticle" may mean particles having an average particle diameter of nanometers (nm), for example, may mean particles having an average particle diameter of 1 to 1,000 nm, It is not limited.

In the present application, parts by weight can be converted into a relative ratio based on one component even if the description method for determining one reference material and expressing the content of other components according to this application or the reference material is not specified, It should be construed that the composition ratio of the composition is clearly stated.

Engineered stone is a plate-shaped artificial manufactured by molding a composition in which quartz aggregate and a thermosetting resin (eg, unsaturated polyester resin) is mixed through compression molding (eg, vacuum-vibration-compression process) and then heat-setting. It is marble.

Conventionally, in order to manufacture an engineered stone, a coupling agent is first mixed with a resin in the form of an additive, and then the resin mixed with the coupling agent and quartz aggregate, etc. are mixed. However, according to this method, it is difficult to form a siloxane film by reacting with the interface of the quartz because the methoxy or alkoxy groups of the silane are not sufficiently hydrated. In addition, in the manufacturing process of engineered stone with low flowability of the mixture due to the low resin content of 7 to 15% by weight, even if this method is used, it is not sufficiently combined with the quartz aggregate.

In addition, in order to suppress the occurrence of pinholes during manufacturing, it is necessary to remove air bubbles present in the material mixture (composition of engineered stone), that is, defoaming. An example of a defoaming method for the composition of engineered stone is as follows.

One way is to lower the viscosity of the composition. Specifically, by increasing the content of the solvent used together with the resin (eg, unsaturated polyester resin) component, the viscosity of the resin blended when forming the composition of the engineered stone is lowered. However, if the method is used, changes to process conditions may be required because the viscosity of the resin changes from the step of mixing the composition, and in particular, a pattern different from the expected engineered stone pattern may be formed, and the physical properties of the engineered stone are also reduced. can be

Another defoaming method is heating and maintaining a constant temperature state for the composition of the engineered stone. When the temperature of the composition increases, the viscosity of the resin blended in the composition decreases, and air bubbles can be removed. However, the defoaming effect is insignificant when the heating state as described above is maintained, that is, when a constant temperature condition is not formed after heating. Since it is difficult to form a constant temperature condition in the manufacturing process of engineered stone, it is necessary to improve the defoaming method through heating.

Accordingly, the present applicant intends to provide an engineered stone and a manufacturing method thereof as described below in order to solve these problems.

Hereinafter, the polymer composition of the present application, an engineered stone including the same, and a manufacturing method thereof will be described in detail with reference to the accompanying drawings. However, the accompanying drawings are exemplary, and the scope of the polymer composition of the present application, an engineered stone including the same, and a manufacturing method thereof are not limited by the accompanying drawings.

1 is a flowchart for a method of manufacturing an engineered stone according to an embodiment of the present application.

As shown in Figure 1, the manufacturing method includes the steps of pre-treating quartz with a silane-based coupling agent (S10); Mixing the pre-treated quartz and unsaturated polyester with the silane-based coupling agent, forming a mixture (S20); and compression molding the mixture (S30).

This method is different from processes using thermoplastic resins. Unlike acrylic artificial marble manufactured through a continuous process as a raw material with flowability, thermosetting resin accounts for about 10% of the mass of the engineered stone according to the present application.

In particular, a mixture of pretreated quartz and thermosetting resin has no fluidity like a liquid. Therefore, it is differentiated from artificial marble manufactured through a continuous process with flowability using a thermoplastic resin.

In addition, packing is required by removing voids inside and on the surface through a special process called VCV (vacuum/compression/vibration).

Therefore, packing is required by removing voids inside and on the surface through a special process called VCV (vacuum/compression/vibration).

In addition, when manufacturing engineered stone, the bonding force at the interface of the filler becomes an important problem in productivity as well as physical properties of the product due to the nature of the process. have.

Hereinafter, the manufacturing method of the present application will be described in more detail for each step.

First, the quartz is pretreated with a silane-based coupling agent (S10).

The range of average diameters of quartz is very wide. That is, nano-sized fumed silica can be used, and even thick chips up to 4.0mm can be used.

In the present application, the filler may represent the appearance and texture of natural stone, and inorganic aggregates used in known engineered stones (resin-based reinforced natural stones) may be used. In a specific embodiment, the aggregate is a silica-based natural mineral, for example, silica, specifically crystalline silica, Quartz, fumed silica, and fused silica in an amorphous state. It also includes all types of silica-based glass (Glass) or waste glass processed by pulverizing. The form of silica and glass may be a powder with a size of 100 µm or less, sand of 100 µm or more, or a chip form of several mm in size, and the filler included in the present application may include a combination thereof, etc. . In the present application, it is preferable to use quartz.

In the present application, a coupling agent (eg, a silane-based coupling agent) may be used to increase the bonding force between the quartz and the thermosetting resin. In particular, compared to the conventional method of mixing the resin and the coupling agent first and then mixing the filler again, the coupling agent and the filler are mixed with the resin by first modifying the surface of the filler with the coupling agent of the filler and the resin. As the resin penetrates in a sufficiently bonded state, the reactivity of the coupling agent can be greatly improved, and through this, the mechanical properties of the engineered stone can also be improved.

In addition, heterogeneous patterning is used to improve the commercial properties of engineered stones, and pretreatment is performed using a coupling agent to improve bonding strength, thereby greatly reducing pinhole formation. Through this, it is possible to solve the problem of a non-uniform mixture frequently occurring in the patterning process.

The silane-based coupling agent combines a reactive group with an inorganic material (eg, a methoxy group, an ethoxy group) and a reactive group with an organic material (eg, a vinyl group, an epoxy group, an amino group, a methacryl group, a mercapto group). include Due to the structure having two different reactive groups, the silane-based coupling agent is used to increase the bonding strength between the inorganic material and the organic material with poor usability.

Therefore, using these characteristics, it is widely used in a wide range of fields such as processing of glass fibers, synthetic resins, paints, adhesives, and various inorganic additives. A widely used silane-based coupling agent has an R-Si(OR') ₃ structure, and the left side of Si is a functional group, usually denoted by R, and the right side is denoted by a hydrolyzable group, OR'.

The silane-based coupling agent is a methoxy group or alkoxy group through hydration reaction to form a hydrogen bond with the inorganic aggregate in the form of silanol, and then form an organic film of siloxane and react with the organic material to combine the inorganic material and the organic material. , it is possible to improve the interfacial bonding force between inorganic materials and organic materials due to the good compatibility of the reactor.

In the process of pre-treating quartz with a silane-based coupling agent, dry coating and wet coating may be applied.

As an example, 25 parts by weight of a silane-based coupling agent is mixed with 100 parts by weight of an alcohol-based solvent to prepare a first mixture. A second mixture is prepared by stirring the first mixture at 200 to 500 rpm for 4 to 10 hours. Then, based on 100 parts by weight of quartz, the second mixture is mixed so that 0.1 to 2 parts by weight of the silane-based coupling agent can be mixed to prepare a third mixture. To improve fluidity, 90 to 110 parts by weight of the first mixture is mixed to prepare a fourth mixture. However, the content of the coupling agent is determined in proportion to the total surface area of the quartz co-material. Then, the fourth mixture is ball milled at 25 to 50° C. for 4 to 8 hours to prepare a fifth mixture. Then, the fifth mixture is dried at 35 to 70° C. for 8 to 12 hours to recover the sixth mixture. As described above, the sixth mixture is quartz whose surface has been modified with a silane-based coupling agent.

Then, by mixing quartz and unsaturated polyester pretreated with the silane-based coupling agent, a mixture is formed (S20).

Here, the component ratio of the unsaturated polyester and quartz may be 5 to 15 parts by weight: 95 to 85 parts by weight. Specifically, the component ratio of the unsaturated polyester and quartz in the composition is 6 to 14 parts by weight: 94 to 86 parts by weight, 7 to 13 parts by weight: 93 to 87 parts by weight, 8 to 12 parts by weight: 92 to 88 parts by weight Parts, 9 to 10 parts by weight: It may be 91 to 99 parts by weight. The composition may control the viscosity of the unsaturated polyester according to the temperature of the quartz aggregate by including the unsaturated polyester and quartz in the above weight ratio.

As used herein, the term “thermosetting resin” refers to a resin that can be cured through the application of appropriate heat or an aging process. For example, the type of the thermosetting resin is one selected from the group consisting of an epoxy resin, an unsaturated polyester resin, a polyvinyl chloride resin, a polystyrene resin, a polycarbonate resin, a polyethylene terephthalate resin, and a styrene-methyl methacrylate copolymer resin. Although the above can be used, it is preferable to use an unsaturated polyester resin.

The unsaturated polyester resin is a binder resin, and may be a resin mixture including an unsaturated polyester polymer and a vinyl monomer. In the present specification, the unsaturated polyester resin may refer to a resin mixture in which an unsaturated polyester polymer and a vinyl-based monomer are mixed. In addition, in the present specification, the unsaturated polyester polymer may mean an unsaturated polyester polymer compound having a weight average molecular weight of at least 3000 or more or 3000 or more.

In one example, the unsaturated polyester resin may be composed of 60 wt% to 75 wt% of an unsaturated polyester polymer and 25 wt% to 40 wt% of a vinylic monomer. Specifically, the lower limit of the content of the unsaturated polyester polymer in the unsaturated polyester resin is 61% by weight or more, 62% by weight or more, 63% by weight or more, 64% by weight or more, 65% by weight or more, 66% by weight or more, 67 weight % or greater or 68 weight % or greater. In addition, the upper limit of the content of the unsaturated polyester polymer in the unsaturated polyester resin may be 74% by weight or less, 73% by weight or less, 72% by weight or less, 71% by weight or less, 70% by weight or less, or 69% by weight or less. In addition, the lower limit of the content of the vinyl-based monomer in the unsaturated polyester resin is 26 wt% or more, 27 wt% or more, 28 wt% or more, 29 wt% or more, 30 wt% or more, 31 wt% or more, 32 wt% or more, 33 wt% or more, or 34 wt% or more. In addition, the upper limit of the content of the vinyl-based monomer in the unsaturated polyester resin may be 39 wt% or less, 38 wt% or less, 37 wt% or less, or 36 wt% or less. The unsaturated polyester resin may be a viscous solution in which the unsaturated polyester polymer is typically diluted in the vinyl-based monomer. Therefore, by satisfying the content of the vinyl-based monomer in the above-mentioned range, it is possible to suppress the occurrence of pinholes in artificial marble by lowering the viscosity of the unsaturated polyester resin in the composition.

The type of the unsaturated polyester polymer is not particularly limited. For example, a saturated or unsaturated dibasic acid as the unsaturated polyester polymer; And an unsaturated polyester polymer prepared through a condensation reaction of a polyhydric alcohol may be used. Examples of the saturated or unsaturated dibasic acid include ortho-phthalic acid, isophthalic acid, maleic anhydride, citraconic acid, fumaric acid, itaconic acid, phthalic acid, phthalic anhydride, terephthalic acid, succinic acid, adipic acid, sebacic acid or tetrahydrophthalic acid. Can be used. In addition, as the polyhydric alcohol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, 1,3-butylene glycol, hydrogenated bisphenol A, trimethylol propane monoaryl Ethers, neopentyl glycol, 2,2,4-trimethyl-1,3-pentadiol and/or glycerin may be used. In addition, if necessary, a monobasic acid such as acrylic acid, propionic acid or benzoic acid in the unsaturated polyester polymer; Alternatively, a polybasic acid such as trimellitic acid or tetracarboxylic acid of benzol may be further used.

As the kind of the vinyl-based monomer, an alkyl acrylate monomer or an aromatic vinyl-based monomer may be used. Preferably, in consideration of the reactivity with the unsaturated polyester polymer as the vinyl-based monomer, an aromatic vinyl-based monomer may be used.

Specifically, as the aromatic vinyl-based monomer, styrene, α-methylstyrene, p-methylstyrene, vinyl toluene, alkyl styrene substituted with an alkyl group having 1 to 3 carbon atoms, or styrene substituted with halogen may be used.

The composition may further include various additives. In one example, the composition may further include at least one selected from the group consisting of a UV reflector, a UV absorber, and a light stabilizer.

In one example, the additive may be included in an amount of 0.1 parts by weight to 30 parts by weight based on 100 parts by weight of the unsaturated polyester resin in the composition. In the present specification, parts by weight means a ratio of the weight of another material based on the weight of one material.

Specifically, the lower limit of the content of the additive included in the composition is 0.3 parts by weight or more, 0.5 parts by weight or more, 1 part by weight or more, 2 parts by weight or more, 3 parts by weight or more, 4 parts by weight or more, relative to 100 parts by weight of the unsaturated polyester resin. It may be at least 5 parts by weight or at least 5 parts by weight. In addition, the upper limit of the content of the additive included in the composition is 25 parts by weight or less, 20 parts by weight or less, 20 parts by weight or less, 15 parts by weight or less, 10 parts by weight or less, 5 parts by weight relative to 100 parts by weight of the unsaturated polyester resin. parts by weight or less, 3 parts by weight or less, or 1 part by weight or less. As the additive is further included in the composition in an amount in the above-described range, the above-described kinds of additives may perform their respective functions.

The ultraviolet reflector blocks light in the ultraviolet region by reflecting at least some of the light incident from the outside in the ultraviolet region on the surface of the artificial marble to prevent the light in the ultraviolet region from coming into contact with the unsaturated polyester resin. A substance that has properties. The light in the ultraviolet region may generally refer to light having a wavelength range of 400 nm or less.

The kind of the ultraviolet reflector is not particularly limited. For example, the ultraviolet reflector may include at least one selected from the group consisting _{of silicon dioxide (SiO 2} ), zirconia (ZrO ₂ ), titanium dioxide (TiO ₂ ), and alumina (Al ₂ O _{3 ).}

The ultraviolet absorber selectively absorbs at least some of the light incident from the outside in the ultraviolet region and changes it in the form of heat to prevent deterioration of the unsaturated polyester resin by the light in the ultraviolet region, thereby reducing the light in the ultraviolet region. It means a material with blocking properties.

The kind of the said ultraviolet absorber is not specifically limited. For example, the ultraviolet absorber is one selected from the group consisting of cyanoacrylate-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, malonic acid-based ultraviolet absorbers, oxanilide-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, and triazine-based ultraviolet absorbers. may include more than one.

The light stabilizer removes radicals generated by light incident from the outside to prevent photooxidation of the unsaturated polyester resin by radicals, and thus means a material having a property of blocking the light.

The type of the light stabilizer is not particularly limited. For example, the light stabilizer may include a hindered amine light stabilizer (HLAS) light stabilizer. The hindered amine-based light stabilizer may include an N-OR (alkoxy group) type, N-H (hydrogen atom) type, or N-R (alkyl group) type.

For example, the N-OR type hindered amine light stabilizer includes a NOR type hindered amine light stabilizer system (Tinuvin PA123, manufactured by BASF), a NOR type hindered amine light stabilizer system (Tinuvin®). XT850FF, manufactured by BASF), a weathering stabilizer system based on a NOR-type hindered amine light stabilizer system (Tinuvin 855FF, manufactured by BASF), 4-butylamino-2,2,6 peroxidized ,6-Tetramethylpiperidine with 2,4,6-trichloro-1,3,5-triazine and cyclohexane, N,N'-ethane-1,2-diylbis(1,3-propanediamine ) (Flamestab NOR116FF, manufactured by BASF) or bis(1-undecanoxy-2,2,6,6-tetramethylpiperidin-4-yl)carbonate (LA-81, ADEKA (manufactured by ADEKA) may be included.

In addition, as the NH-type hindered amine-based light stabilizer, NH-type hindered amine-based light stabilizer system (N30, manufactured by Clariant), Tetrakis (1,2,2,6,6-pentamethyl-4-) piperidyl) butane-1,2,3,4-butane tetracarboxylate (Adecastab LA-57, manufactured by ADEKA), bis(2,2,6,6,-tetramethyl-4 -piperidyl)sebacate (TINUVIN 770DF, manufactured by BASF), N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)-N,N '-Diformylhexamethylenediamine (UVINUL4050FF, manufactured by BASF), dibutylamine·1,3,5-triazine·N,N′-bis(2,2,6,6-tetramethyl-4 -Piperidyl)-1,6-hexamethylenediamine and N-(2,2,6,6-tetramethyl-4-piperidyl)butylamine polycondensate (Chimassorb 2020FDL, BASF) manufactured by BASF), poly[{6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl}{(2,2,6,6- tetramethyl-4-piperidyl)imino}hexamethylene {(2,2,6,6-tetramethyl-4-piperidyl)imino}] (Cimasorb 944FDL, manufactured by BASF) or olefin (C20-C24)/maleic anhydride/4-amino-2,2,6,6-tetramethylpiperidine copolymer (UVINUL5050H, manufactured by BASF) and the like.

Further, as the NR-type hindered amine stabilizer, bis(1,2,2,6,6-pentamethyl-4-piperidyl)[[3,5-bis(1,1-dimethylethyl)-4 -Hydroxyphenyl]methyl]butylmalonate (Tinuvin 144, manufactured by BASF), bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate and methyl 1,2 , 2,6,6-pentamethyl-4-piperidyl sebacate mixture (Tinuvin 765, manufactured by BASF), succinic acid and dimethyl-1-(2-hydroxyethyl)-4-hydroxy-2 ,2,6,6-tetramethylpiperidine polycondensate (Tinuvin 622SF, manufactured by BASF), N,N'-bis(3-aminopropyl)ethylenediamine-2,4-bis[N-butyl -N-(1,2,2,6,6-pentamethyl-4-piperidyl)amino]-6-chloro-1,3,5-triazine condensate (SABOSTABUV119, manufactured by SABO Srl), tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl)1,2,3,4-butanetetracarboxylate (Adecastab LA-52, manufactured by Adecas), 1,2, 2,6,6-pentamethyl-4-piperidyl/tridecyl 1,2,3,4 butane tetracarboxylate (Adecastab LA-62, manufactured by Adecas), 1,2,3,4- Butanetetracarboxylic acid, 1,2,2,6,6-pentamethyl-4-piperidinol and 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8 , 10-tetraoxaspiro [5,5] mixed ester of undecane (Adecastab LA-63, manufactured by Adecas), tetrakis (2,2,6,6-tetramethyl-4-piperidyl)-1 ,2,3,4-butanetetracarboxylate, 1,2,3,4-butanetetracarboxylic acid, 1,2,2,6,6-pentamethyl-4-piperidinol, and tridecyl alcohol a condensate of the family (Adecastab LA-63P, manufactured by Adecas) or 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate, and the like.

The above-mentioned hindered amine-based light stabilizer may be used alone or as a mixture of two or more thereof.

And the mixture is compression-molded (S30).

The molding may be vacuum-vibration-compression molding. Specifically, the vacuum-vibration-compression molding may be performed at a vacuum degree of 1 mbar to 20 mbar, under vibration conditions of 2000 rpm to 5000 rpm for 1 minute to 5 minutes. Specifically, the degree of vacuum may be 5 mbar to 18 mbar or 10 mbar to 15 mbar. Specifically, the vibration speed may be 2500 rpm to 4500 rpm or 3000 rpm to 4000 rpm. Specifically, the vacuum-vibration-compression molding may be performed for 2 minutes to 4 minutes. By performing vacuum-vibration-compression under the above-described conditions, a slab compressed into a flat plate can be manufactured.

The manufacturing method of the engineered stone may further include the step of hardening. The curing may be performed after the molding. The curing may be accomplished by applying heat to the slab manufactured in the compression molding step. Specifically, in the curing step, the engineered stone can be manufactured by applying heat to the slab manufactured in the compression molding step to harden it.

In one example, the curing may be performed at a higher temperature than the heating. For example, the curing may be performed in an oven at 100° C. to 150° C. for 30 minutes to 1 hour and 30 minutes. Specifically, the temperature may be 110 °C to 140 °C or 120 °C to 130 °C. In addition, the curing time may be 40 minutes to 1 hour 20 minutes or 50 minutes to 1 hour 10 minutes. Engineered stone can be manufactured by curing the slab under the conditions described above.

The flexural strength of the engineered stone manufactured by the above-described manufacturing method is superior to the flexural strength of the engineered stone manufactured by the conventional general method. Specifically, the flexural strength of the engineered stone manufactured by the conventional method is generally 60 MPa or less. In contrast, the flexural strength of the engineered stone manufactured by the manufacturing method according to the present application is 65 to 90 MPa. In addition, a method of measuring the flexural strength of the engineered stone will be described in the following experimental examples.

Hereinafter, the present application will be described in more detail through experimental examples.

[Experimental example]

[Example 1]

5000 g of a mixture of 90 parts by weight of quartz particles pretreated with 1 part by weight of a silane-based coupling agent and 10 parts by weight of an unsaturated polyester resin was minced through a vacuum-compression-vibration process, and then cured at 120° C. for 40 minutes in Example 1 of engineered stones were manufactured.

An SEM image of the surface of the engineered stone according to Example 1 is shown in FIG. 2 .

[Comparative Example 1]

After mixing 8 parts by weight of an unsaturated polyester resin and 2 parts by weight of a silane-based coupling agent, a mixture of 5000 g of which 90 parts by weight of quartz particles are further mixed is minced through a vacuum-compression-vibration process, and then cured at 120° C. for 40 minutes Comparative Example 1 of engineered stones were manufactured.

An SEM image of the surface of the engineered stone according to Comparative Example 1 is shown in FIG. 3 .

[evaluation]

In order to measure the flexural strength with respect to Example 1 and Comparative Example 1, samples (150 mm) of Example 1 and Comparative Example 1 were prepared.

An experiment was performed using a three-point bending system using a universal testing machine (UTM). Specifically, each sample was placed on two points separated by a certain distance, and a load was applied to the center at a rate of 0.1 mm/sec. When adding , the strength at the time of failure was measured. The results are shown in Table 1 below.

Example 1 Comparative Example 1 Flexural strength (MPa) 73.39 59.22

As shown in Table 1, it was confirmed that the flexural strength of Example 1 in which quartz was pretreated with a silane-based coupling agent and mixed with an unsaturated polyester resin was superior to that of Comparative Example 1 according to the conventional method.

Although the above has been described with reference to the preferred embodiments of the present application, those skilled in the art will make various modifications and changes to the present application within the scope without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that you can.

Claims (3)

pre-treating quartz with a silane-based coupling agent;
forming a mixture by mixing quartz and unsaturated polyester pretreated with the silane-based coupling agent; and
A method of manufacturing an engineered stone comprising the step of compression molding the mixture.
The method of claim 1,
The component ratio of the unsaturated polyester and quartz is 5 to 15 parts by weight: 95 to 85 parts by weight of the method for producing an engineered stone.
The method of claim 1,
The flexural strength of the engineered stone is 65 to 90 MPa.

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