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Title:
CHEMICAL RESISTANT UPPER PLATE OF LABORATORY BENCH WITH DUAL UV-CURE COATING LAYER AND METHOD OF MANUFACTURING THE SAME
Document Type and Number:
WIPO Patent Application WO/2010/013874
Kind Code:
A1
Abstract:
The present invention provides a chemical resistant upper plate for a laboratory bench including a dual UV-curable coating layer, in which a coating layer is formed on a base layer using a UV-curable coating agent to prevent the upper plate from being influenced by various chemicals such as acids, alkalis, organic solvents and the like, and a method of manufacturing the same. The chemical resistant upper plate for a laboratory bench includes: a base layer; a first coating layer formed on the base layer using a primary UV-curable coating agent; and a second coating layer formed on the first coating layer using a secondary UV-curable coating agent.

Inventors:
CHAI SOO-MIN (KR)
Application Number:
PCT/KR2008/007643
Publication Date:
February 04, 2010
Filing Date:
December 24, 2008
Export Citation:
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Assignee:
YOUNWOO IND CO LTD (KR)
CHAI SOO-MIN (KR)
International Classes:
B01L9/02
Foreign References:
KR100364295B12002-12-16
JPH1043613A1998-02-17
KR20060078556A2006-07-05
KR20070068808A2007-07-02
Attorney, Agent or Firm:
CHANG, Soon-Boo et al. (371-28,Gasan-dong, Geumcheon-gu, Seoul 153-803, KR)
Download PDF:
Claims:
Claims

[1] A chemical resistant upper plate for a laboratory bench comprising a dual UV- curable coating layer, comprising: a base layer; a first coating layer formed on the base layer using a primary UV-curable coating agent; and a second coating layer formed on the first coating layer using a secondary UV- curable coating agent. [2] The chemical resistant upper plate for a laboratory bench according to claim 1, wherein the base layer includes a corner having a chamfered shape. [3] The chemical resistant upper plate for a laboratory bench according to claim 1, wherein the first coating layer and the second coating layer are integrally formed on both upper and lateral surfaces of the base layer, respectively. [4] The chemical resistant upper plate for a laboratory bench according to claim 1, wherein the primary UV-curable coating agent comprises 20 ~ 65 wt% of a urethane acrylate oligomer, 50 ~ 75 wt% of an acrylate monomer, and 1 - 8 wt% of a photoinitiator. [5] The chemical resistant upper plate for a laboratory bench according to claim 4, wherein the urethane acrylate oligomer is formed by a reaction of polyester diol, iso-holon diisocyanate and 2-hydroxyethyl acrylate, and has a molecular weight of 1500 ~ 2000. [6] The chemical resistant upper plate for a laboratory bench according to claim 4, wherein the urethane acrylate oligomer includes a bifunctional urethane acrylate oligomer. [7] The chemical resistant upper plate for a laboratory bench according to claim 4, wherein the acrylate monomer is a multifunctional monomer having a number average molecular weight of 300 ~ 500. [8] The chemical resistant upper plate for a laboratory bench according to claim 4 or

7, wherein the primary UV-curable coating agent comprises modified polysiloxane acrylate. [9] The chemical resistant upper plate for a laboratory bench according to claim 1 or

4, wherein the primary UV-curable coating agent has a viscosity of 200 ~ 400 cps at a temperature of 250C. [10] The chemical resistant upper plate for a laboratory bench according to claim 1, wherein the secondary UV-curable coating agent comprises 10 - 30 wt% of a urethane acrylate prepolymer, 30 ~ 70 wt% of methyl methacrylate, 5 - 45 wt% of trimethylolpropane triacrylate, and 1 - 8 wt% of a photoinitiator. [11] The chemical resistant upper plate for a laboratory bench according to claim 10, wherein the urethane acrylate prepolymer is formed by a reaction of a di- isocyanate compound, polyol and an acrylate compound having an hydroxy group, and the polyol has a molecular weight of 400 ~ 3000.

[12] The chemical resistant upper plate for a laboratory bench according to claim 1 or

10, wherein the secondary UV-curable coating agent has a viscosity of 2 ~ 50 cps at a temperature of 250C.

[13] The chemical resistant upper plate for a laboratory bench according to claim 1, wherein the first and second coating layers have a total thickness of 2 ~ 4 mm.

[14] A method of manufacturing a chemical resistant upper plate for a laboratory bench comprising a dual UV-curable coating layer, comprising the steps of: cutting and processing a base layer to have a shape suitable for the use and place of the laboratory bench; applying a primary UV-curable coating agent onto an upper surface or upper and lateral surfaces of the base layer to a thickness of 0.05 ~ 0.2 mm to form a first coating layer; and applying a secondary UV-curable coating agent onto the first coating layer to a thickness of 0.1 ~ 0.2 mm to form a second coating layer.

[15] The method of manufacturing a chemical resistant upper plate for a laboratory bench according to claim 14, wherein the primary UV-curable coating agent comprises 20 ~ 65 wt% of a urethane acrylate oligomer, 50 ~ 75 wt% of an acrylate monomer, and 1 - 8 wt% of a photoinitiator, and the secondary UV-curable coating agent comprises 10 - 30 wt% of a urethane acrylate prepolymer, 30 - 70 wt% of methyl methacrylate, 5 - 45 wt% of trimethylolpropane triacrylate, and 1 - 8 wt% of a photoinitiator.

[16] The method of manufacturing a chemical resistant upper plate for a laboratory bench according to claim 14, wherein the primary and secondary UV-curable curing agent are photocured at an irradiation dose of 700 - 1300 mJ for 1 - 60 seconds.

Description:
Description

CHEMICAL RESISTANT UPPER PLATE OF LABORATORY

BENCH WITH DUAL UV-CURE COATING LAYER AND

METHOD OF MANUFACTURING THE SAME

Technical Field

[1] The present invention relates to a chemical resistant upper plate for a laboratory bench comprising a dual UV-curable coating layer and a method of manufacturing the same, and, more particularly, to a chemical resistant upper plate for a laboratory bench comprising a dual UV-curable coating layer, in which a primary UV-curable coating layer and a secondary UV-curable coating layer are sequentially formed on a base layer to have excellent properties, and a method of manufacturing the same. Background Art

[2] Since an upper plate for a laboratory bench is frequently brought into contact with or exposed to chemicals having strong corrosivity or solubility, such as acids, alkalis, organic solvents and the like, it needs to be highly durable to high temperature, impact and abrasion.

[3] Conventionally, an upper plate for a laboratory bench is made of wood. The upper plate for a laboratory bench is coated thereon with a protecting agent (paint or like), is provided thereon with a synthetic resin plate such as a melamine resin plate, or is coated thereon with a resin paint. Further, the upper plate for a laboratory bench is made of a material prepared by mixing several kinds of materials, such as synthetic resin, silica sand and the like.

[4] Such an upper plate for a laboratory bench is used in various technical fields, such as chemistry, pharmacy, medicine, food, biological engineering, genetic engineering, mechanical engineering, electric engineering, electronic engineering, architecture engineering, civil engineering and the like. In particular, an upper plate fabricated by attaching a flat board of an extruded phenol resin onto plywood using bonding is chiefly used for laboratories.

[5] However, the above conventional upper plate for a laboratory bench is problematic in that it is easily deformed when subject to temperature change, and that it has low resistance to corrosion, impact and chemicals. Therefore, it is not suitable to be used for laboratories.

[6] In order to solve the above problems, an upper plate for a laboratory bench integrated with a high pressure epoxy laminate (HPE) in which core layers and an epoxy resin layer are formed on a base layer has been developed. However, in this upper plate for a laboratory bench, first and second core layers and an epoxy resin layer are respectively prepared, and then they are sequentially disposed and then heated and pressurized to form a high pressure epoxy laminate (HPE), and the high pressure epoxy laminate (HPE) adheres to the base layer, so that only the upper surface of the upper plate of a laboratory bench has chemical resistance.

[7] That is, since the conventional upper plate for a laboratory bench is provided with an additional functional panel which has chemical resistance and which adheres to the base layer, when the lateral surface of the upper plate is brought into contact with chemicals, there is a problem in that the lateral surface of the upper plate becomes discolored, and the base layer and the functional panel separate from each other, thus causing a gap therebetween.

[8] Further, the conventional upper plate for a laboratory bench is non-economical in that, when the functional panel is partially damaged, the upper plate must be entirely replaced, and thus great expenses are incurred and a lot of working time is required. In particular, a laboratory bench is generally designed such that it is properly used according to its use and place. However, since the conventional upper plate for a laboratory bench has a laminated structure, there are many problems in that it is difficult to change its design, and thus the laboratory bench cannot be fabricated and used in a manner appropriate to its intended use, and the like. Disclosure of Invention

Technical Problem

[9] Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a chemical resistant upper plate for a laboratory bench including a dual UV-curable coating layer having excellent chemical resistance, in which a coating layer is formed on a base layer using a UV-curable coating agent to prevent the upper plate from being influenced by various chemicals such as acids, alkalis, organic solvents and the like, and a method of manufacturing the same.

[10] Another object of the present invention is to provide a chemical resistant upper plate for a laboratory bench including a dual UV-curable coating layer, in which a coating layer having excellent chemical resistance is formed on a base layer using a UV- curable coating agent, and which can exhibit design effects by easily applying the coating layer to the base layer having various shapes, and a method of manufacturing the same.

[11] Another object of the present invention is to provide a chemical resistant upper plate for a laboratory bench including a dual UV-curable coating layer, in which a chemical resistant coating layer is formed on both upper and lateral surfaces of the upper plate using a UV-curable coating agent to prevent the upper plate from being damaged and deformed by chemicals, and a method of manufacturing the same. [12] Another object of the present invention is to provide a chemical resistant upper plate for a laboratory bench including a dual UV-curable coating layer, in which coating layers are dually formed using different kinds of UV-curable coating agents, and which exhibit excellent adhesion between the coating layers and a base layer and high surface hardness, and a method of manufacturing the same. [13] Another object of the present invention is to provide a chemical resistant upper plate for a laboratory bench including a dual UV-curable coating layer, in which a uniform coating layer is formed through a spray process, and which can improve workability and productivity, and a method of manufacturing the same.

Technical Solution [14] In order to accomplish the above objects, the present invention provides an upper plate for a laboratory bench, including: a base layer; a first coating layer formed on the base layer using a primary UV-curable coating agent; and a second coating layer formed on the first coating layer using a secondary UV-curable coating agent. [15] In the upper plate, the base layer may include a corner having a chamfered shape, and the first coating layer and the second coating layer may be integrally formed on both upper and lateral surfaces of the base layer, respectively. [16] The primary UV-curable coating agent may include 20 ~ 65 wt% of a urethane acrylate oligomer, 50 ~ 75 wt% of an acrylate monomer, and 1 - 8 wt% of a pho- toinitiator. [17] In this case, the urethane acrylate oligomer may be formed by a reaction of polyester diol, iso-holon diisocyanate and 2-hydroxyethyl acrylate. [18] The urethane acrylate oligomer may include a bifunctional urethane acrylate oligomer. [19] The secondary UV-curable coating agent may include 10 - 30 wt% of a urethane acrylate prepolymer, 30 - 70 wt% of methyl methacrylate, 5 - 45 wt% of trimethy- lolpropane triacrylate, and 1 - 8 wt% of a photoinitiator.

Advantageous Effects

[20] According to the present invention, a primary UV-curable coating agent having excellent adhesivity and a secondary UV-curable coating agent having excellent material properties are sequentially applied onto a base layer to form first and second coating layers, and the primary and secondary UV-curable coating agents are urethane- based coating agents, so that the adhesion between the first coating layer and the base layer is improved, the base layer is integrated with the first and second coating layers, and the first and second coating layers have excellent durability and chemical resistance. [21] Further, according to the present invention, since coating layers are dually formed on a base layer using UV-curable coating agents different from each other, the characteristics of the UV-curable coating agents are respectively exhibited, and the disadvantages of the respective UV-curable coating agents are complementary to each other, so that the coating layers entirely have excellent material properties.

[22] Further, according to the present invention, since a bifunctional urethane acrylate oligomer is used to form a coating layer, it is possible to prevent the coating layer from cracking.

[23] Further, according to the present invention, since modified polysiloxane acrylate is used to form a coating layer, the tensile strength of the coating layer can be improved.

[24] Further, since the upper plate of the present invention is provided with coating layers formed by sequentially applying and curing coating agents onto a base layer compared to a conventional upper plate having a laminate structure, the upper plate can be formed to have various shapes regardless of the shape of the base layer, and the corner of the upper plate can be curved and chamfered, thereby exhibiting various design effects. In particular, when the corner of the upper plate is curved and rounded, it is possible to prevent a chemical vessel from being damaged when the corner of the upper plate collides with the chemical vessel due to the carelessness of an experimenter, thus protecting the experimenter.

[25] Further, since the upper plate of the present invention is provided with coating layers formed by sequentially applying and curing coating agents onto a base layer, it can be widely applied to laboratory benches used for experiments, research, education and the like.

[26] Further, since the UV-curable coating agents of the present invention have viscosity sufficient to be applied onto a base layer using a bar coater, a brush, a roller or a sprayer, the workability can be improved and uniform coating layers can be formed.

[27] Further, according to the upper plate of the present invention, since UV-curable coating agents can be applied and cured on both upper and lateral surfaces of the upper plate, side damage occurring to the upper plate due to the falling of chemicals can be prevented, so that the lifespan of the upper plate can be increased, and the maintenance costs thereof can be decreased.

[28] Further, according to the upper plate of the present invention, when coating layers are partially damaged, since only the damaged portions thereof can be coated with UV- curable coating agents, the upper plate of the present invention is very economical compared to a conventional upper plate in which coating layers must be entirely replaced when they are partially damaged. Brief Description of Drawings [29] FIG. 1 is a view showing an upper plate for a laboratory bench according to an embodiment of the present invention; [30] FIG. 2 is a block diagram showing a method of manufacturing an upper plate for a laboratory bench according to an embodiment of the present invention; [31] FIG. 3 is a test result report showing the results of testing the chemical resistance of an upper plate for a laboratory bench according to an embodiment of the present invention; and [32] FIG. 4 is a test result report showing the results of testing the material properties of a laboratory bench.

[33] <Description of the elements in the drawings>

[34] 10: base layer

[35] 20: first coating layer

[36] 30: second coating layer

[37] 40: upper plate

[38] 41: upper surface

[39] 42: lateral surface

[40] 43: chamfered portion

Best Mode for Carrying out the Invention [41] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. [42] An upper plate for a laboratory bench according to an embodiment of the present invention includes: a base layer; a first coating layer formed on the base layer using a primary UV-curable coating agent; and a second coating layer formed on the first coating layer using a secondary UV-curable coating agent. [43] The base layer includes a corner having a chamfered shape. The first coating layer and the second coating layer are integrally formed on both upper and lateral surfaces of the base layer, respectively. [44] The base layer serves as a substrate of a laboratory bench. Plywood, particle board

(PB), medium-density fiberboard (MDF), high-density fiberboard (HDF) or the like may be used as the base layer. Preferably, particle board (PB) may be used as the base layer. [45] The first coating layer is formed by applying a primary UV-curable coating agent to the upper and lateral surfaces of the base layer and then curing the primary UV-curable coating agent. The primary UV-curable coating agent is applied to the upper surface or upper and lateral surfaces of the base layer to a thickness of 0.05 ~ 0.2 mm using a roller, a brush, a bar coater or a sprayer. [46] The primary UV-curable coating agent includes 20 ~ 65 wt% of a urethane acrylate oligomer, 50 ~ 75 wt% of an acrylate monomer, and 1 - 8 wt% of a photoinitiator.

[47] In this case, the urethane acrylate oligomer is formed by a reaction of polyester diol, iso-holon diisocyanate and 2-hydroxyethyl acrylate, and has a molecular weight of 1500 ~ 2000.

[48] That is, the urethane acrylate oligomer is formed by reacting polyester diol having a number average molecular weight of 1000 with iso-holon diisocyanate at 75 0 C for 10 hours to form a reaction product and then cooling the reaction product, and then adding 2-hydroxyethyl acrylate to the cooled reaction product to form a reaction mixture, and then reacting the reaction mixture at 75 ~ 85 0 C. The urethane acrylate oligomer formed in this way has a weight average molecular weight of about 1700 ~ 1800.

[49] Further, the urethane acrylate oligomer may include a bifunctional urethane acrylate oligomer.

[50] In this case, the bifunctional urethane acrylate oligomer is formed by reacting an isocyanate compound, which is obtained by reacting polyether polyol with straight- chain aliphatic or substituted diisocyanate, with an acrylate monomer having a hydroxy group.

[51] A multifunctional monomer having a number average molecular weight of 300 ~ 500 is used as the acrylate monomer. The multifunctional monomer is selected from among trimethylolpropane triacrylate (TMPTA), tripropyleneglycol diacrylate (TPGDA) and a mixture thereof.

[52] Further, in the present invention, in order to improve the tensile property of the coating layer, the primary UV-curable coating agent may further include modified polysiloxane acrylate.

[53] The photoinitiator is one selected from among 1 -hydroxy cyclohexylphenyl ketone,

2,2-dimethoxy-2-phenyl-acetophenone, xanthone, benzaldehyde, and anthraquinone.

[54] The primary UV-curable coating agent has a viscosity of 200 ~ 400 cps at a temperature of 25 0 C, and is applied to the base layer and then cured to form the first coating layer having high adhesivity.

[55] The second coating layer is formed by applying a secondary UV-curable coating agent to the first coating layer and then curing the secondary UV-curable coating agent. The secondary UV-curable coating agent is applied to the first coating layer to a thickness of 0.1 ~ 0.2 mm using a roller, a brush, or a sprayer.

[56] The secondary UV-curable coating agent includes 10 ~ 30 wt% of a urethane acrylate prepolymer, 30 ~ 70 wt% of methyl methacrylate, 5 - 45 wt% of trimethylolpropane triacrylate, and 1 - 8 wt% of a photoinitiator.

[57] Further, the urethane acrylate prepolymer is formed by the reaction of a diisocyanate compound (isophorone diisocyanate), polyol (polyethyleneglycol) and a (meth)acrylate compound (hydroxypropyl methacrylate) having a hydroxy group. In this case, in con- sideration of the hardness of a final coating layer, the polyol may have a molecular weight of 400 ~ 3000.

[58] The methyl methacrylate serves to impart flexibility and elasticity to the final coating layer, and simultaneously serves as a diluent. When the amount of the methyl methacrylate is less than 30 wt%, the viscosity of the secondary UV-curable coating agent is excessively increased, and when the amount thereof is more than 70 wt%, the hardness of the final coating layer is decreased.

[59] Further, when the amount of the trimethylolpropane triacrylate is less than 5 wt%, the hardness of the coating layer is decreased, and when the amount thereof is more than 45 wt%, the flexibility of the coating layer is decreased.

[60] The photoinitiator is one selected from among 1 -hydroxy cyclohexylphenyl ketone,

2,2-dimethoxy-2-phenyl-acetophenone, xanthone, benzaldehyde, and anthraquinone.

[61] The primary UV-curable coating agent has a viscosity of 200 ~ 400 cps at a temperature of 25 0 C, and has a hardness of 4 ~ 8 H when it is applied and cured.

[62] Further, it is preferred that the first and second coating layers be formed such that the total thickness thereof is 0.2 ~ 0.4 mm.

[63] Hereinafter, a method of manufacturing an upper plate for a laboratory bench according to an embodiment of the present invention will be described as follows.

[64] The method of manufacturing an upper plate for a laboratory bench according to an embodiment of the present invention includes the steps of: cutting and processing a base layer to have a shape suitable for the use and place of the laboratory bench; applying a primary UV-curable coating agent onto the upper surface or upper and lateral surfaces of the base layer using a roller, a brush, a bar coater or sprayer to a thickness of 0.05 ~ 0.2 mm to form a first coating layer; and applying a secondary UV- curable coating agent onto the first coating layer using a roller, a brush, a bar coater or sprayer to a thickness of 0.1 ~ 0.2 mm to form a second coating layer.

[65] The processed base layer is purified in order to remove fine dust and alien substances therefrom.

[66] In the method, the primary UV-curable coating agent includes 20 ~ 65 wt% of a urethane acrylate oligomer, 50 ~ 75 wt% of an acrylate monomer, and 1 - 8 wt% of a photoinitiator, and the secondary UV-curable coating agent includes 10 - 30 wt% of a urethane acrylate prepolymer, 30 - 70 wt% of methyl methacrylate, 5 - 45 wt% of trimethylolpropane triacrylate, and 1 - 8 wt% of a photoinitiator.

[67] Further, in the method, a mercury lamp, a xenon lamp or the like having a wavelength of 350 - 400 nm is used as a UV irradiation source. The irradiation of UV is conducted at an irradiation dose of 700 - 1300 mJ, preferably 700 - 1000 mJ for an irradiation time of 1 - 60 seconds, preferably 10 - 30 seconds. When the irradiation dose of UV is less than 700 mJ or the irradiation time is less than 1 second, the primary and secondary UV-curable coating agents are not sufficiently cured, and thus the first and second coating layers cannot be formed. In contrast, when the irradiation dose thereof is more than 1300 mJ or the irradiation time is more than 60 seconds, the first and second coating layers are discolored or embrittled.

[68] Further, the entire surface of the base layer coated with the primary and secondary coating agents is uniformly irradiated with UV by irradiating both the upper and lateral surfaces of the base layer with UV.

[69] As described above, the upper plate for a laboratory bench of the present invention includes a first coating layer formed on a base layer using a primary UV-curable coating agent having excellent adhesivity and a second coating layer formed on the first coating layer using a secondary UV-curable coating agent having excellent surface hardness and chemical resistance, so that it has excellent adhesivity, durability and chemical resistance. Mode for the Invention

[70] Hereinafter, the present invention will be described in more detail with reference to the following Examples.

[71]

[72] Example 1

[73] A primary UV-curable coating agent having a viscosity of 350 cps was formed by mixing 30 wt% of a urethane acrylate prepolymer, 18 wt% of trimethylolpropane tri- acrylate (TMPTA), 48 wt% of tripropyleneglycol diacrylate (TPGDA) and 4 wt% of 1 -hydroxy cyclohexylphenyl ketone.

[74]

[75] Example 2

[76] A secondary UV-curable coating agent having a viscosity of 2 cps was formed by mixing 23 wt% of a urethane acrylate prepolymer, 47 wt% of methyl methacrylate, 23 wt% of trimethylolpropane triacrylate, and 7 wt% of a photoinitiator.

[77]

[78] Example 3

[79] A particle board having a thickness of 40 mm was chamfered, and then a primary

UV-curable coating agent formed in Example 1 was applied to the upper and lateral surfaces of the chamfered particle board to a thickness of 0.1 mm using a roller and then photocured to form a first coating layer. Subsequently, a secondary UV-curable coating agent formed in Example 2 was applied to the surface of the first coating layer to a thickness of 0.2 mm using a sprayer and then photocured to form a second coating layer.

[80] In this case, the first and second coating layers are formed by irradiating the primary and secondary UV-curable coating agents with UV at an iradiation dose of 700 mJ for 10 seconds at an irradiation distance of 10 cm, respectively. Further, the secondary UV-curable coating agent was left alone at room temperature for about 10 minutes after the formation of the first coating layer, and was then applied onto the first coating layer.

[81] The hardness of the test sample formed in this way was measured. As a result, the hardness thereof was 4H, which was higher than the reference hardness (IH) of a general laboratory bench. Therefore, it can be seen that the test sample has better resistance to scratching than the general laboratory bench.

[82]

[83] Example 4

[84] A test sample was formed using the same method as in Example 3, and then the chemical resistance of the test sample was tested. The test results thereof are shown in FIG. 3.

[85] FIG. 3 is a test result report showing the results of testing the chemical resistance of the test sample. In this test, each of hydrochloric acid, nitric acid, sulfuric acid, sodium hydroxide, ethyl alcohol, toluene and benzene was dropped on the test sample by two drops using a spuit and then left for about 5 hours, and then it was observed whether the test sample was discolored, corroded or swollen.

[86] As a result, it can be seen that the upper plate for a laboratory bench according to the present invention is not changed by 35% hydrochloric acid which has higher concentration than 30% hydrochloric acid used as a reference value in Korea (Korea Environment & Merchandise Testing Institute), that the upper plate is not changed by 62% nitric acid which has a 2% higher concentration than 60% nitric acid used as a reference value in Korea, that the upper plate is not changed by 98% sulfuric acid which has a 3% higher concentration than 95% sulfuric acid used as a reference value in Korea, that the upper plate is not changed by 35w/v% sodium hydroxide which has a 5w/v% higher concentration than 30w/v% sodium hydroxide used as a reference value in Korea, and that the upper plate is not changed by 99.5% ethyl alcohol, 99.5% toluene or 99.5% benzene used as a reference value in Korea. Consequently, from these results, it can be seen that the upper plate for a laboratory bench including a dual UV-curable coating layer according to the present invention has excellent chemical resistance.

[87]

[88] Example 5

[89] An upper plate for a laboratory bench was formed using the same method as in

Example 3, and then the material properties of a laboratory bench provide with the upper plate were tested. The test results thereof are shown in FIG. 4. This test was conducted by Korea Environment & Merchandise Testing Institute, and the test method thereof was based on KS G 4012. [90] FIG. 4 is a test result report showing the results of testing the material properties of the laboratory bench. From the test result report, it can be seen that the test results thereof are better than reference values thereof with respect to all test items. [91] [92] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.