KR20190086223A - Curved laminated glass and manufacturing method for curved laminated glass - Google Patents

Abstract

The present invention relates to a curved laminated glass and a method for producing a curved laminated glass.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a curved laminated glass and a curved laminated glass,

The present invention relates to a curved laminated glass and a method for producing a curved laminated glass.

Glass is a material that has been applied to various living spaces due to its unique transparency. Particularly, two glass-bonded laminated glasses are used, and a curved laminated glass having a curved surface is used according to the purpose for which the glass is used. Further, in order to reduce the volume and weight of the curved laminated glass, a curved laminated glass is manufactured using thin plate glass thinner than thick plate glass and thick plate glass.

Self-weight molding, compression molding, and cold molding methods are generally used to produce curved laminated glass. The self-weight molding is performed by using a mold for fixing the rim of the glass, raising the temperature to the vicinity of the softening point of the glass to be molded and sagging the glass by the weight of the glass, . Further, the compression molding is a method in which the glass to be formed is sufficiently heated and pressed into a mold having a predetermined shape, and then the formed glass is bonded. In cold forming, another glass is placed on a concave surface of a glass molded into a curved surface, and another glass is elastically deformed using a vacuum technique to form a curved surface, and then the formed glass is bonded.

However, when the thin plate glass is formed into a curved surface by using the cold forming, the curvature radius of the curved thin plate glass to be manufactured is lower than that of the self weighting or compression molding.

Therefore, there is a need for a technique for manufacturing a curved laminated glass having a low radius of curvature without breakage by using cold forming.

The present specification is intended to provide a method of manufacturing a curved glass sheet and a curved glass sheet.

It should be understood, however, that the present invention is not limited to the above-mentioned problems and other problems which are not mentioned can be understood by those skilled in the art from the following description.

One embodiment of the present invention is a bonding layer comprising a first side having a first radius of curvature and a second side having a second radius of curvature; A curved surface plate glass provided in contact with one surface of the bonding layer; And a curved thin plate glass provided in contact with the other surface of the bonding layer and thinner than the thickness of the curved thick plate glass, wherein the first curvature radius is smaller than the second curvature radius.

Further, another embodiment of the present invention provides a method of manufacturing the curved laminated glass.

One embodiment of the present invention comprises the steps of preparing a curved plate glass; Preparing a bonding layer comprising a first side having a first radius of curvature and a second side having a second radius of curvature; Bonding one surface of the bonding layer to a concave surface of the curved plate glass; Positioning a thin plate glass plate thinner than the thickness of the curved plate glass on the other side of the bonding layer; And elastically deforming the thin plate glass to form a curved laminated glass by bonding on the other side of the bonding layer, wherein the first radius of curvature is smaller than the second radius of curvature, ≪ / RTI >

According to one embodiment of the present invention, it is possible to provide a curved laminated glass including curved thick plate glass and curved thin plate glass having different curvature radii.

The method of manufacturing a curved laminated glass according to an embodiment of the present invention can easily manufacture a curved laminated glass including curved thick plate glass and curved thin plate glass having different radius of curvature.

The method of manufacturing a curved laminated glass according to an embodiment of the present invention can produce a curved laminated glass having an excellent optical quality.

The effects of the present invention are not limited to the effects described above, and effects not mentioned can be clearly understood by those skilled in the art from the present description and the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a curved surface bonded glass according to an embodiment of the present invention. Fig.
2 is a graph showing the results of securing rigidity according to thickness ratios of a curved thick plate glass and a curved thin plate glass according to an embodiment of the present invention.
3 is a view showing a method of manufacturing a curved laminated glass according to an embodiment of the present invention.

Throughout this specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

Throughout this specification, when a member is "on " another member, it includes not only when the member is in contact with the other member, but also when there is another member between the two members.

Throughout this specification, the unit "wt%" can refer to the weight ratio of the components contained in the member to the total weight of the member.

Throughout this specification, " radius of curvature " can mean the minimum value of the radius of the arc closest to the curve along all directions at the microspot of the surface of the member molded from the plate to a curved surface of 300 mm x 300 mm And the radius of curvature can be measured by scanning and modeling the surface of the curved member using a 3D Scanner (Faro / Focus S). Thus, the radius of curvature of a member having a single curved surface or a member having a curved surface can be measured.

In the entire specification of the present application, the "modulus of elasticity" of a member is obtained by fixing both ends of a sample prepared according to JIS-K6251-1 standard, applying a force in a direction perpendicular to the thickness direction of the sample at a temperature of 24 ° C Refers to a value obtained by measuring a stress per unit area according to a strain, and a tensile strength meter (Zwick / Roell Z010 UTM) or the like can be used as a measuring instrument at this time.

The inventors of the present invention have been able to manufacture a curved laminated glass in which a curved thick plate glass having a different curvature radius and a curved thin plate glass are bonded by using a bonding layer including one surface having a first radius of curvature and another surface having a second radius of curvature As a result, a method of manufacturing a curved laminated glass and a curved laminated glass were developed.

Hereinafter, the present invention will be described in more detail.

One embodiment of the present invention is a bonding layer comprising a first side having a first radius of curvature and a second side having a second radius of curvature; A curved surface plate glass provided in contact with one surface of the bonding layer; And a curved thin plate glass provided in contact with the other surface of the bonding layer and thinner than the thickness of the curved thick plate glass, wherein the first curvature radius is smaller than the second curvature radius.

According to one embodiment of the present invention, it is possible to provide a curved laminated glass including curved thick plate glass and curved thin plate glass having different curvature radii. Specifically, it is possible to provide a curved laminated glass in which a curved thick plate glass having a different radius of curvature and a curved thin plate glass are bonded to each other via a bonding layer including one surface having a first radius of curvature and another surface having a second radius of curvature .

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a curved surface bonded glass according to an embodiment of the present invention. Fig. 1 is a plan view of a bonding layer 200 having a first radius of curvature and a curved plate glass 100 on one side A of the bonding layer 200 having a first radius of curvature, And the curved laminated glass 300 is provided on the curved laminated glass 300 in contact with the curved laminated glass 300.

According to an embodiment of the present invention, the bonding layer may be a curved bonding layer including one surface having a first radius of curvature and another surface having a second radius of curvature. 1, one surface A of the bonding layer 200 is provided on a concave surface of the curved thick plate glass 100, and the other surface B of the bonding layer 200 is formed on the curved thin plate glass Or on the convex surface of the substrate 300. That is, the first radius of curvature of one side of the bonding layer may be substantially the same as the radius of curvature of the curved plate glass. The fact that the radius of curvature is substantially the same may mean not only the case where the radii of curvature are completely equal to each other but also the degree of quality and optical properties which do not affect the radii of curvature even if a slight difference occurs in the manufacturing process. In addition, the second radius of curvature of the other surface of the bonding layer may be substantially equal to the radius of curvature of the curved thin plate glass.

The curved laminated glass according to one embodiment of the present invention may be one produced by a method of manufacturing a curved laminated glass described later. The curved plate glass, the bonding layer, and the curved thin plate glass included in the curved laminated glass may be the same as the curved plate glass, the bonding layer, or the curved thin plate glass used in the method of manufacturing the curved laminated glass described later.

According to one embodiment of the present invention, one side of the bonding layer is matched with the concave side of the curved plate glass, and the other side of the bonding layer can be matched with the convex side of the curved thin plate glass. Wherein a state in which the one surface of the bonding layer and the concave surface of the curved plate glass are matched is characterized in that a radius of curvature of the one surface of the bonding layer is substantially equal to a radius of curvature of the curved plate glass, Concave surfaces are in contact with each other, and the curved plate glass and the bonding layer form edges together at the same position. The state where the other surface of the bonding layer and the concave surface of the curved thin plate glass are matched may be the same as described above.

As one side of the bonding layer is matched with the concave side of the curved flat plate glass and the other side of the bonding layer is matched with the convex side of the curved thin plate glass, And the transmission performance of the curved glass can be improved.

Therefore, the curved surface bonded glass according to one embodiment of the present invention can have excellent optical properties.

According to an embodiment of the present invention, the first curvature radius of one side of the bonding layer may be smaller than the second radius of curvature of the other side of the bonding layer. That is, the radius of curvature of the curved thick plate glass included in the curved laminated glass may be smaller than the curvature radius of the curved thin plate glass. 1, the radius of curvature of the convex surface may be smaller than the radius of curvature of the concave surface. Since the curved surface laminated glass has a different curvature radius from the convex surface and the concave surface, the curved laminated glass can be utilized in a wide variety of fields.

According to an embodiment of the present invention, the ratio of the first radius of curvature and the second radius of curvature may be from 1: 1.2 to 1: 1.8. Specifically, the ratio of the first radius of curvature and the second radius of curvature may be from 1: 1.4 to 1: 1.6, from 1: 1.2 to 1: 1.5, or from 1: 1.6 to 1: 1.8. It is possible to provide a curved laminated glass having various curvatures by adjusting the ratio of the first radius of curvature of one side of the bonding layer and the second radius of curvature of the other side of the bonding layer to the above range. By adjusting the ratio of the first radius of curvature and the second radius of curvature to the above-mentioned range, it is possible to prevent a significant difference in the radius of curvature of the curved plate glass from the curvature radius of the curved plate glass, It is possible to prevent the mechanical properties and / or the optical quality of the curved laminated glass from deteriorating. Specifically, by adjusting the ratio of the first radius of curvature and the second radius of curvature to the above-mentioned range, it is possible to prevent the plate-like thin plate glass from being damaged in the process of elastic deformation. Further, it is possible to prevent a significant difference in the radius of curvature of the curved plate glass from the curvature radius of the curved plate glass, thereby preventing the visible distortion of the material visible through the curved glass laminate.

According to an embodiment of the present invention, the bonding layer may have a single curved surface or a double curved surface. That is, one surface and the other surface of the bonding layer may have a single curved surface or a double curved surface. Specifically, the bonding layer may be a curved surface bonding layer of a single curved surface shape formed in one axis and having a curvature only in one direction. Further, the bonding layer may be a curved surface bonding layer of a double curved surface shape formed in two axes and having curvature in multiple directions. As an example, the curved surface bonding layer in the form of a double curved surface may have a paraboloid.

The curved thick plate glass bonded to one surface of the double curved surface bonding layer may be a curved glass having a curved surface shape. For example, a plate-like thick plate glass may be formed in two axes to produce a double-curved surface plate glass having the same radius of curvature as one surface of the double-curvilinear junction layer.

In addition, the curved thin plate glass bonded to the other surface of the double-curved surface bonding layer may be a double-sided glass. As will be described later, the plate-like thin plate glass can be formed into the shape of the other surface of the bonding layer in the process of being elastically deformed. That is, the plate-like thin plate glass is elastically deformed on the other surface of the double curved surface bonding layer, so that a curved thin plate glass having a double curved surface can be formed.

Therefore, according to one embodiment of the present invention, it is possible to provide a curved laminated glass in the form of a single curved surface or a double curved surface.

According to an embodiment of the present invention, the first curvature radius of one surface of the bonding layer may be 1600 R or less. That is, the radius of curvature of the curved plate glass may be 1600 R or less. Further, the radius of curvature of the one surface of the bonding layer and the curved thick plate glass may be 800 R or more and 1200 R or less, 1000 R or more and 1400 R or less, or 1200 R or more and 1600 R or less.

In addition, the curvature radius of one surface of the double curved surface bonding layer and the double curved surface plate glass may be 1600 R or less. The radius of curvature of one surface of the birefringent surface bonding layer may be an average value of radii of curvature measured at a plurality of points spaced the same distance from the center of one surface of the double surface bonding layer. Further, the curvature radius of the double curved surface plate glass may be a value measured in the same manner as described above.

According to an embodiment of the present invention, the second radius of curvature may be 1200 R or more and 5000 R or less. That is, the radius of curvature of the curved thin plate glass may be 1200 R or more and 5000 R or less. The radius of curvature of the other surface of the bonding layer and the curved thin plate glass may be 1500 R or more and 4500 R or less, 2000 R or more and 3500 R or less, 2200 R or more and 3000 R or less, or 2500 R or more and 2700 R or less. The curvature radius range of the above-mentioned curved thin plate glass may be in the range of the radius of curvature where breakage does not occur in the elastically deformed curved thin plate glass.

The curvature radius of the other surface of the double curved surface bonding layer and the curved surface glass of the double curved surface may be 1200 R or more and 5000 R or less. The radius of curvature of the other surface of the double curved surface bonding layer and the curved surface glass of the double curved surface may be a value measured in the same manner as described above.

According to one embodiment of the present invention, it is possible to provide a curved laminated glass in which the convex surface of a curved thin plate glass is bonded on a concave surface of a curved thick plate glass having a relatively small radius of curvature without breakage. Specifically, the convex surface of the curved laminated glass can freely have a radius of curvature of the curved glass formed by the thermoforming method, and the concave surface of the curved laminated glass has a radius of curvature that can be elastically deformed without breakage .

Further, by controlling the radius of curvature of the curved plate glass and the radius of curvature of the curved plate glass, the curved laminated glass having various curvatures can be provided.

According to an embodiment of the present invention, soda lime glass may be used as the thick plate glass. Specifically, the glass which is commonly used as a window glass of the transportation means with the above thick plate glass can be adopted without any particular limitation. For example, in the plate glass, the composition 100 wt% per Si0 ₂ 65 wt% or more 75 wt% or less, Al ₂ O ₃ 0 wt% or more 10 wt% or less, NaO ₂ 10 wt% or more 15 wt% or less, K ₂ O 0 wt% to 5 wt%, CaO 1 wt% to 12 wt%, and MgO 0 wt% to 8 wt% may be used as the soda lime glass. Soda lime glass produced by a float method using a float bath, soda lime glass manufactured by a down draw method or a fusion method may be used as the plate glass.

According to one embodiment of the present invention, glass commonly used as a window glass of a transportation means with the above laminated glass can be adopted without any particular limitation. Specifically, as the thin plate glass, an alkali-free glass can be used.

For example, in the sheet glass, the composition 100 wt% per Si0 ₂ 46 wt% or more 62 wt% or less, Al ₂ O ₃ 15 wt% or more 29 wt% or less, MgO 3 wt% or more 14 wt% or less, CaO 7 wt Alkali-free glass formed from a composition containing not less than 16 wt% and not more than 16 wt% of SrO and not more than 0.01 wt% and not more than 5 wt% of SrO and substantially not containing an alkali metal oxide can be used.

The term substantially containing no alkali metal oxide means that the alkali metal oxide is not contained in the glass at all, or even if the alkali metal oxide is included in the glass, its content is extremely small as compared with other components, And so on. For example, the term " substantial " may mean a case where a small amount of an alkali metal element which is inevitably incorporated into glass from a refractory material in contact with the molten glass or an impurity in the glass raw material in the glass manufacturing process may be included.

According to one embodiment of the present invention, the alkali-free glass which can be used as the thin plate glass is an alkali-free glass containing less than 1% of an alkali metal (Li, Na, K, etc.) oxide expressed as percentage by mass in terms of oxide Can be used. Further, as the thin plate glass, alkali-free borosilicate glass or alkali-free aluminoborosilicate glass can be used. Further, as the thin plate glass, glass produced by the float method, glass produced by the down draw method or the fusion method can be used.

According to an embodiment of the present invention, the bonding layer is formed of a material selected from the group consisting of polyvinyl butyral, thermoplastic polyurethane, polyethylene, polypropylene, polystyrene, polyvinylidene fluoride polyvinylidene fluoride, polyvinylidene fluoride, polytetrafluoroethylene, polyethyleneterephthalate, polymethy lmethacrylate, polyacrylonitrile, polycarbonate, and acrylonitrile. butadiene styrene).

According to an embodiment of the present invention, the thickness ratio of the curved plate glass to the curved thin plate glass may be 1: 0.1 to 1: 0.5. Specifically, the thickness ratio of the curved plate glass to the curved thin plate glass may be 1: 0.15 to 1: 0.45, 1: 0.25 to 1: 0.3, 1: 0.15 to 1: 0.25, or 1: 0.3 to 1: have. By controlling the thickness ratio of the curved plate glass and the curved thin glass plate to the above-mentioned range, it is possible to effectively prevent the curved glass laminate from being broken due to the decrease in rigidity. Further, the curved laminated glass can be made lighter and thinner effectively.

2 is a graph showing the results of securing rigidity according to thickness ratios of a curved thick plate glass and a curved thin plate glass according to an embodiment of the present invention. More specifically, FIG. 2 is a view showing an analysis of a deflection amount of a center portion by applying a constant load to a central portion in a state where four corners of a curved surface bonded glass according to an embodiment of the present invention are fixed. In FIG. 2, the x-axis represents the total glass thickness and the y-axis represents the deflection of the glass, that is, the degree of warpage.

According to one embodiment of the present invention, the AR (Asymmetry ratio), which is the thickness of the curved thin plate glass / the thickness of the curved thick plate glass, can satisfy the range of 0.1 to 0.5. As the AR becomes smaller, the thickness of the curved thin plate glass becomes thinner and the thickness of the curved thick plate glass becomes thicker. Referring to FIG. 2, the thickness ratio of the curved thin plate glass to the curved thick plate glass can be adjusted to the above-mentioned range, and the degree of warping of the curved glass can be lowered to secure rigidity.

Therefore, according to one embodiment of the present invention, the thickness ratio of the curved thin plate glass and the curved thick plate glass can be adjusted to the above-mentioned range to further improve the rigidity increasing effect, the lightening effect and the thinning effect of the curved laminated glass.

According to an embodiment of the present invention, the thickness of the curved thin plate glass may be 0.3 mm or more and 1.0 mm or less. Specifically, the thickness of the curved thin plate glass may be 0.3 mm or more and 0.8 mm or less, 0.4 mm or more and 0.6 mm or less, 0.3 mm or more and 0.7 mm or less, or 0.5 mm or more and 0.8 mm or less. The curved laminated glass including the curved thin plate glass having the thickness in the above-mentioned range is excellent in impact resistance and can be effectively thinned and lightweight.

According to an embodiment of the present invention, the thickness of the curved thick plate glass may be 2 mm or more and 3 mm or less. Specifically, the thickness of the curved thick plate glass may be 2.5 mm or more and 3 mm or less. By controlling the thickness of the curved thick plate glass to the above-mentioned range, it is possible to prevent the impact resistance of the curved laminated glass from deteriorating. Further, the curved laminated glass can be made lighter and thinner effectively.

The upper limit value and the lower limit value of the thickness of the curved thin plate glass and the curved thick plate glass can be determined in consideration of the elastic absorption of the mechanical impact force applied to the curved laminated glass and the like.

According to an embodiment of the present invention, the curved glass laminate including the curved plate glass and the curved laminated glass having the thickness in the above-mentioned range is a conventional curved glass laminated with two conventional soda lime glasses having a thickness of about 2.1 mm And can have a thickness of 50% or more and 80% or less, and can have a weight of 50% or more and 80% or less. Therefore, according to one embodiment of the present invention, it is possible to provide a curved surface laminated glass which is lighter and thinner than conventional curved laminated glass.

According to an embodiment of the present invention, a compressive stress may be formed on the opposite surface of the curved thin plate glass surface adjacent to the curved thickened plate glass. The curved thin plate glass may be formed by being elastically deformed from a plate-like thin plate glass. Referring to FIG. 1, a compressive stress can be formed on the concave side of the resiliently deformed curved thin plate glass 300 inwardly from the end of the curved thin plate glass 300. The curved laminated glass including the curved thin plate glass on which the compressive stress is formed on the concave surface can be excellent in durability.

According to an embodiment of the present invention, the Vickers hardness ratio of the curved plate glass and the curved thin plate glass may be 1: 1.1 to 1: 1.3. Specifically, the Vickers hardness ratio of the curved plate glass and the curved thin plate glass may be 1: 1.12 to 1: 1.27, 1: 1.15 to 1: 1.25, or 1: 1.2 to 1: 1.23. The concave surface of the curved laminated glass including the curved thin plate glass having a hardness higher than that of the curved thickened plate glass may be excellent in abrasion resistance, scratch resistance and durability.

According to an embodiment of the present invention, the Vickers hardness of the curved thin plate glass may be 5.5 GPa or more and 7 GPa or less. Specifically, the curved thin plate glass may have Vickers hardness of 5.8 GPa or more and 6.9 GPa or less, 6.0 GPa or more and 6.7 GPa or less, or 6.2 GPa or more and 6.5 GPa or less. The curved laminated glass including the curved thin plate glass having the Vickers hardness value in the above-mentioned range can be excellent in impact resistance, abrasion resistance and durability. By using the curved thin plate glass having the Vickers hardness in the above-mentioned range, it is possible to prevent the impact resistance of the curved laminated glass from deteriorating. Further, the manufacturing cost of the curved thin plate glass can be reduced, and the production cost of the curved laminated glass can be reduced. In addition, the curved surface plate glass may have Vickers hardness of 5.2 GPa or more and 5.8 GPa or less.

The Vickers hardness of the curved thin plate glass and the curved thick plate glass can be calculated by measuring the size of the local region after pressing the glass using a Vickers indentor. Specifically, the Vickers hardness of the curved thin plate glass and the curved thick plate glass was measured under the conditions of 24 ° C. and 35 RH% of humidity in accordance with ASTM C1327-08 standard, with an indentation load of 200 gf and an indentation holding time of 20 seconds Can be measured.

According to an embodiment of the present invention, the fracture toughness ratio of the curved plate glass to the curved thin plate glass may be 1: 1.3 to 1: 1.5. Specifically, the fracture toughness ratio of the curved plate glass and the curved thin plate glass may be 1: 1.35 to 1: 1.49, 1: 1.37 to 1: 1.45, or 1: 1.39 to 1: 1.45. The curved thin plate glass has a fracture toughness in the above-described range with respect to the curved thick plate glass, and thus it is possible to effectively prevent the breaking strength of the curved laminated glass from being lowered.

According to one embodiment of the present invention, the fracture toughness value of the curved thin plate glass may be 1.0 MPa · m ^1/2 or more and 1.3 MPa · m ^1/2 or less. Specifically, the fracture toughness value of the curved thin plate glass is 1.1 MPa · m ^1/2 or more and 1.25 MPa · m ^1/2 or less, 1.15 MPa · m ^1/2 or more and 1.25 MPa · m ^1/2 or less, or 1.18 MPa m ^1/2 to 1.21 MPa · m ^1/2 or less. The curved laminated glass including the curved thin plate glass having the fracture toughness value in the above-mentioned range can be excellent in impact resistance.

Further, the fracture toughness value of the curved thick plate glass may be 0.7 MPa · m ^1/2 or more and 0.85 MPa · m ^1/2 or less. Specifically, the fracture toughness value of the curved surface plate glass may be 0.75 MPa · m ^1/2 or more and 0.83 MPa · m ^1/2 or less, or 0.77 MPa · m ^1/2 or more and 0.8 MPa · m ^1/2 or less.

The fracture toughness values of the curved thin plate glass and the curved thick plate glass are measured by indentation fracture toughness measurement, which is a method of calculating using crack length, pressure particle mark, load, etc. until the glass cracks with Vickers indenters . Specifically, the fracture toughness values of the curved thin plate glass and the curved thick plate glass can be measured by setting the indentation load to 2 Kgf in accordance with the KS L 1600: 2010 standard at a temperature of 24 ° C. and a humidity of 35 RH% .

According to an embodiment of the present invention, the elastic modulus ratio of the curved plate glass to the curved thin plate glass may be 1: 1.01 to 1: 1.2. Specifically, the modulus ratio of the curved plate glass to the curved thin plate glass is 1: 1.04 to 1: 1.17, 1: 1.06 to 1: 1.15, 1: 1.08 to 1: 1.12, or 1: 1.08 to 1: . The curved laminated glass has a modulus of elasticity in the above-described range with respect to the curved thick plate glass, and thus the curved laminated glass can have a strong structure even when it comprises a curved thin plate glass which is thinner than the curved thick plate glass.

According to an embodiment of the present invention, the modulus of elasticity of the curved thin plate glass may be 70 GPa or more and 90 GPa or less. Specifically, the curved thin plate glass may have an elastic modulus of 73 GPa or more and 87 GPa or less, 75 GPa or more and 85 GPa or less, 78 GPa or more and 80 GPa or less, 75 GPa or more and 80 GPa or less, or 80 GPa or more and 90 GPa or less . In addition, the curved plate glass may have an elastic modulus of 65 GPa or more and 75 GPa or less.

The modulus of elasticity of the curved thin plate glass and the curved thick plate glass can be measured by a three-point bending test. Specifically, the three-point bending test using a tensile strength meter (Zwick / Roell Z010 UTM) at 24 ° C and 35 RH% atmosphere can measure the elastic modulus of the curved thin plate glass and the curved plate glass have. More specifically, the width of the sample is set to 20 mm, the support span is set to 50 mm, and the displacement and the load measured through the tensile strength meter are expressed as strain and stress stress can be obtained by deriving a strain-stress (SS) curve and then calculating the elastic modulus through the slope calculated by linear fitting the SS curve.

Another embodiment of the present invention provides a method of manufacturing the curved laminated glass.

One embodiment of the present invention comprises the steps of preparing a curved plate glass; Preparing a bonding layer comprising a first side having a first radius of curvature and a second side having a second radius of curvature; Bonding one surface of the bonding layer to a concave surface of the curved plate glass; Positioning a thin plate glass plate thinner than the thickness of the curved plate glass on the other side of the bonding layer; And elastically deforming the thin plate glass to form a curved laminated glass by bonding on the other side of the bonding layer, wherein the first radius of curvature is smaller than the second radius of curvature, ≪ / RTI >

The method of manufacturing a curved laminated glass according to an embodiment of the present invention can easily manufacture a curved laminated glass including curved thick plate glass and curved thin plate glass having different radius of curvature. Specifically, a curved laminated glass including a curved thick plate glass and a curved thin plate glass having different curvature radii can be manufactured by using the bonding layer including one side and the other side having different radii of curvature.

A conventional method of manufacturing a curved laminated glass is a method of manufacturing a curved laminated glass by thermally forming a laminated glass plate and a plate-like laminated glass sequentially on a concave surface of a glass plate molded into a curved surface by thermoforming, Respectively. At this time, the thermoforming method can produce a curved thin plate glass having a relatively small radius of curvature, but the cold forming method for elastically deforming the glass without heat is to manufacture a curved thin plate glass having a relatively large radius of curvature . That is, in the case of using the cold forming method, it is not easy to manufacture a curved thin plate glass having a small radius of curvature such as a curved thin plate glass formed by a thermoforming method. Therefore, when the thin plate glass is elastically deformed on the concave surface of the curved plate glass having a small radius of curvature formed by thermoforming, as in the conventional method of manufacturing the curved laminated glass, A problem of buckling occurred. Therefore, in the conventional method of manufacturing the curved laminated glass, the thick plate glass is thermoformed to a radius of curvature (hereinafter, referred to as a limit radius of curvature) in which the thin plate glass can be elastically deformed without breakage and the thin plate glass is elastically deformed, Glass was prepared. That is, the convex surface and the curvature radius of the concave surface of the curved laminated glass to be produced have a limitation in that they have a radius of curvature of the curved glass formed by the cold forming method.

On the other hand, according to one embodiment of the present invention, by using the bonding layer including the one surface having the first radius of curvature and the other surface having the second radius of curvature, the curved surface plate having a curvature radius smaller than the critical curvature radius of the cold forming method It is possible to easily manufacture a curved laminated glass having a desired curvature without damaging the curved thin plate glass even when the plate-like laminated glass is joined to the concave side of the glass by elastic deformation. That is, the convex surface of the curved laminated glass to be manufactured may have a radius of curvature smaller than the limit curvature radius of the cold forming method.

Therefore, the method of manufacturing a curved glass sheet according to an embodiment of the present invention can produce a curved glass sheet having a smaller curvature than that of the curved glass sheet manufactured by the conventional cold forming method.

3 is a view showing a method of manufacturing a curved laminated glass according to an embodiment of the present invention. 3 is a plan view illustrating a state in which one surface A of the bonding layer 200 is brought into contact with the concave surface of the curved thick plate glass 100 and the thin plate glass 300, and then elastically deforming the thin plate glass 300 to produce a curved laminated glass.

According to one embodiment of the present invention, the step of preparing the curved plate glass can be performed by using a known method of forming curved glass into a curved plate glass in the art. For example, a curved thick plate glass can be manufactured by using the self-weight molding method or the compression molding method.

According to one embodiment of the present invention, the step of preparing the bonding layer may comprise a bonding layer including a first surface having a first radius of curvature substantially equal to a radius of curvature of the curved plate glass. The fact that the radius of curvature is substantially the same may mean not only the case where the radii of curvature are completely equal to each other but also the degree of quality and optical properties which do not affect the radii of curvature even if a slight difference occurs in the manufacturing process. That is, the radius of curvature of the curved plate glass and the radius of curvature of one surface of the bonding layer may be the same.

According to an embodiment of the present invention, the thin plate glass that is elastically deformed on the other surface of the bonding layer may be formed of a curved thin plate glass having the same shape as the other surface of the bonding layer. That is, the curved thin plate glass may have a curvature radius equal to the second curvature radius of the other surface of the bonding layer. Specifically, in the process of elastically deforming the plate-like thin plate glass, the thin plate glass is supported on the other side of the bonding layer to be elastically deformed, and the convex surface of the elastically deformed curved thin plate glass is aligned on the concave surface of the bonding layer . Thus, the plate-like thin plate glass can be formed into a curved thin plate glass having a radius of curvature equal to the second radius of curvature of the other side of the bonding layer.

According to one embodiment of the present invention, the step of preparing the bonding layer comprises the steps of forming a first side having a first radius of curvature and a second side having a second radius of curvature using a known method of imparting a curvature to a member in the art Can be produced. For example, one side of the bonding layer may be polished to have a first radius of curvature after the plate-like bonding layer is formed into a curved surface, and the other side of the bonding layer may be polished to have a second radius of curvature. Alternatively, one side and the other side of the bonding layer formed into a curved surface may be cut with a laser to produce a bonding layer including one side having a first radius of curvature and another side having a second radius of curvature.

According to one embodiment of the present invention, the method of manufacturing the curved laminated glass can elastically deform the thin plate glass at a temperature of 20 ° C to 35 ° C. Therefore, the method of manufacturing the curved laminated glass can form the curved laminated glass without heating the glass, thereby reducing the manufacturing cost of the curved laminated glass. In addition, by omitting the step of slow cooling the glass, the time for producing the curved glass can be shortened.

And is not particularly limited as long as it is a method commonly used in the art as a method of elastically deforming the plate-like thin plate glass. For example, the plate-like thin plate glass can be elastically deformed at a temperature of 20 ° C to 35 ° C through a compression process using a high-temperature roller or a vacuum ring / vacuum bag process.

According to an embodiment of the present invention, compressive stress can be formed on the concave surface of the curved thin plate glass elastically deformed from the plate-like thin plate glass. Referring to FIG. 3, a compressive stress can be formed on the concave side of the elastically deformed curved thin plate glass 300 inwardly from the end of the curved thin plate glass 300. The curved laminated glass including the curved thin plate glass on which the compressive stress is formed on the concave surface can have excellent mechanical properties.

According to an embodiment of the present invention, the ratio of the first radius of curvature and the second radius of curvature may be from 1: 1.2 to 1: 1.8. That is, the ratio of the radius of curvature of the curved plate glass to that of the curved plate glass may be 1: 1.2 to 1: 1.8. The ratio of the first radius of curvature to the second radius of curvature of the bonding layer may be from 1: 1.4 to 1: 1.6, from 1: 1.2 to 1: 1.5, or from 1: 1.6 to 1: 1.8. It is possible to provide a curved laminated glass having various curvatures by adjusting the ratio of the first radius of curvature of one side of the bonding layer and the second radius of curvature of the other side of the bonding layer to the above range. By adjusting the ratio of the first radius of curvature and the second radius of curvature to the above-mentioned range, it is possible to prevent a significant difference in the radius of curvature of the curved plate glass from the curvature radius of the curved plate glass, It is possible to prevent the mechanical properties and / or the optical quality of the curved laminated glass from deteriorating. Specifically, by adjusting the ratio of the first radius of curvature and the second radius of curvature to the above-mentioned range, it is possible to prevent the plate-like thin plate glass from being damaged in the process of elastic deformation. Further, it is possible to prevent a significant difference in the radius of curvature of the curved plate glass from the curvature radius of the curved plate glass, thereby preventing the visible distortion of the material visible through the curved glass laminate.

According to an embodiment of the present invention, the bonding layer may have a single curved surface or a double curved surface. That is, one surface and the other surface of the bonding layer may have a single curved surface or a double curved surface. Specifically, the bonding layer may be a curved surface bonding layer of a single curved surface shape formed in one axis and having a curvature only in one direction. Further, the bonding layer may be a curved surface bonding layer of a double curved surface shape formed in two axes and having curvature in multiple directions. As an example, the curved surface bonding layer in the form of a double curved surface may have a paraboloid.

The curved thick plate glass bonded to one surface of the double curved surface bonding layer may be a curved glass having a curved surface shape. For example, a plate-like thick plate glass may be formed in two axes to produce a double-curved surface plate glass having the same radius of curvature as one surface of the double-curvilinear junction layer.

In addition, the curved thin plate glass bonded to the other surface of the double-curved surface bonding layer may be a double-sided glass. Concretely, the plate-like thin plate glass is elastically deformed on the other surface of the double curved surface bonding layer, so that a curved thin plate glass having a double curved surface can be formed.

Therefore, according to one embodiment of the present invention, a curved laminated glass in the form of a single curved surface or a double curved surface can be produced.

According to an embodiment of the present invention, the first curvature radius of one surface of the bonding layer may be 1600 R or less. That is, the radius of curvature of the curved plate glass may be 1600 R or less. Further, the radius of curvature of the one surface of the bonding layer and the curved thick plate glass may be 800 R or more and 1200 R or less, 1000 R or more and 1400 R or less, or 1200 R or more and 1600 R or less. In addition, the curvature radius of one surface of the double curved surface bonding layer and the double curved surface plate glass may be 1600 R or less.

According to an embodiment of the present invention, the second radius of curvature may be 1200 R or more and 5000 R or less. That is, the radius of curvature of the curved thin plate glass may be 1200 R or more and 5000 R or less. The radius of curvature of the other surface of the bonding layer and the curved thin plate glass may be 1500 R or more and 4500 R or less, 2000 R or more and 3500 R or less, 2200 R or more and 3000 R or less, or 2500 R or more and 2700 R or less. The curvature radius range of the above-mentioned curved thin plate glass may be in the range of the radius of curvature where breakage does not occur in the elastically deformed curved thin plate glass.

The curvature radius of the other surface of the double curved surface bonding layer and the curved surface glass of the double curved surface may be 1200 R or more and 5000 R or less.

According to one embodiment of the present invention, the convex surface of the curved thin plate glass can be bonded on the concave surface of the curved thick plate glass having a relatively small radius of curvature without breaking. Further, by controlling the radius of curvature of the curved plate glass and the curvature radius of the curved plate glass to the above-mentioned range, it is possible to realize a curved glass having various curvatures.

According to an embodiment of the present invention, the bonding layer may be solid at a temperature of 25 ° C or more and 140 ° C or less. The bonding layer in a solid state in the above-mentioned range can maintain a solid state at a temperature range of 20 DEG C or more and 35 DEG C or less, which is a temperature range for elastically deforming the plate-like thin plate glass. Therefore, in the process of the plate-like thin plate glass being elastically deformed, the bonding layer can effectively support the thin plate glass, and the surface quality of the curved thin plate glass to be produced can be improved. Further, as will be described later, the bonding layer can be maintained in a solid state at a temperature range of 80 deg. C or higher and 140 deg. C or lower, which is the post-treatment temperature of the curved glass sheet, and the shape of the curved glass sheet can be prevented from being deformed.

According to one embodiment of the present invention, it is possible to manufacture a curved laminated glass having excellent optical quality by using a bonding layer having a solid phase in the temperature range described above. In the course of providing the bonding layer on the concave surface of the curved thick plate glass, foreign matter may flow between the curved thick plate glass and the bonding layer. Further, in the process of providing the plate-like thin plate glass on the concave surface of the bonding layer, foreign matter may flow between the bonding layer and the plate-like plate glass. However, during the process of elastically deforming the plate-like thin plate glass by putting the plate-like thin plate glass, the joining layer and the curved plate glass into the vacuum space and making the inside of the vacuum space into a vacuum state, the gap between the curved plate glass and the bonding layer, And the foreign matter remaining between the bonding layer and the bonding layer can be discharged to the outside of the curved bonding glass.

On the other hand, in the case of using a liquid bonding layer, the foreign matter introduced into the bonding layer of the liquid phase can not be discharged to the outside during the process of elastically deforming the thin plate glass. During the process of elastically deforming the plate- May occur. Further, when a liquid bonding layer is used, there is a problem that it is not easy to elastically deform the thin plate glass. That is, when a liquid bonding layer is used, it is difficult to elastically deform the thin plate glass, and the optical quality of the curved bonded glass to be manufactured may deteriorate.

Therefore, according to one embodiment of the present invention, by using the solid-phase bonding layer, it is possible to manufacture a curved glass laminate having excellent optical quality.

According to an embodiment of the present invention, the modulus of elasticity of the bonding layer may be 10 MPa or more and 3000 MPa or less. Specifically, in accordance with JIS-K6251-1, the elastic modulus of the bonding layer measured at 24 占 폚 and 35 RH% atmosphere may be 10 MPa or more and 3000 MPa or less. The elastic modulus of the bonding layer is preferably 50 MPa or more and 2500 MPa or less, 100 MPa or more and 2000 MPa or less, 500 MPa or more and 1500 MPa or less, 700 MPa or more and 1000 MPa or less, 10 MPa or more and 500 MPa or less, 600 MPa or more and 2000 MPa or less , 2200 MPa or more and 3000 MPa or less. The bonding layer having an elastic modulus in the above-mentioned range can effectively support the thin plate glass in the process of elastically deforming the plate-like thin plate glass, and cracks and buckling are generated on the surface of the thin plate glass to be produced Can be suppressed. On the other hand, when a liquid bonding layer is used, the liquid bonding layer can not effectively support the thin plate glass which is elastically deformed, so that the curved thin plate glass to be produced is broken, cracks or buckling occurs on the surface of the curved thin plate glass .

Therefore, according to one embodiment of the present invention, a curved laminated glass including a curved thin plate glass having excellent surface quality can be manufactured by using the bonding layer having the elastic modulus in the above-mentioned range.

According to one embodiment of the present invention, any material used as a bonding layer in the art can be used without limitation as long as the bonding layer satisfies the above-described physical properties. For example, the bonding layer may be formed of a material selected from the group consisting of polyvinyl butyral, thermoplastic polyurethane, polyethylene, polypropylene, polystyrene, polyvinylidenefluoride, At least one of polytetrafluoroethylene, polyethyleneterephthalate, polymethy lmethacrylate, polyacrylonitrile, polycarbonate, and acrylonitrile butadiene styrene is used as the filler, . ≪ / RTI >

According to an embodiment of the present invention, the method further comprises the step of post-treating the curved laminated glass at a temperature of 80 ° C or more and 140 ° C or less and a pressure atmosphere of 5 bar to 20 bar . By subjecting the manufactured curved laminated glass to the post-treatment in the above-described atmosphere, the bonding layer can be made rigid by removing the plasticizer and other substances contained in the bonding layer. Further, it is possible to improve the bonding force between the curved thick plate glass and the bonding layer, and between the bonding layer and the curved thin plate glass.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to examples. However, the embodiments according to the present invention can be modified into various other forms, and the scope of the present invention is not construed as being limited to the embodiments described below. Embodiments of the present disclosure are provided to enable those skilled in the art to more fully understand the present invention.

Example  One

Glass 100 wt% Si0 ₂ 61 wt% _{sugar, Al 2 O 3 16 wt%} , MgO 3 wt%, CaO 8 wt% comprising the following, and SrO 0.05 wt% and a non-alkali glass having a thickness of 0.5 mm thin sheet of glass , 72 wt% of SiO ₂ , 0.15 wt% of Al ₂ O ₃ , 14 wt% of Na ₂ O, 0.03 wt% of K ₂ O, 9 wt% of CaO and 4 wt% of MgO per 100 wt% of glass Soda lime glass having a thickness of 2.0 mm was prepared as a plate glass. The elasticity modulus of the alkali-free glass was 78 GPa, the Vickers hardness was 6.3 GPa, and the fracture toughness was 1.20 MPa · m ^1/2 . The elastic modulus of the soda lime glass was 72 GPa, Vickers hardness was 5.6 GPa, fracture toughness was 0.85 Lt; ² > A solid polyvinyl butyral (EASTMAN) film was prepared as a bonding layer. The elastic modulus of the bonding layer measured at 24 ° C and 35 RH% atmosphere was 505 Mpa.

First, the thick plate glass was heated at 600 DEG C for 60 seconds and molded into a curved surface using its own weight to prepare a curved thick plate glass. The radius of curvature of the curved plate glass was about 1000 R. Thereafter, the bonding layer was formed into a curved surface, and one side and the other side of the bonding layer were polished to produce a curved side bonding layer having a curvature radius of about 1000 R on one side and a curvature radius of about 1300 R on the other side.

Thereafter, the convex side of the bonding layer was bonded on the concave side of the curved plate glass within the vacuum space, and the thin plate glass was placed adjacent to the concave side of the bonding layer. Thereafter, the vacuum cavity was sealed, and the glass plate was press-bonded with a vacuum ring at about 20 DEG C and 0.4 torr to elastically deform the thin plate glass to produce a curved laminated glass having curved thin plate glass bonded on the other side of the bonding layer. Then, the curved laminated glass was taken out from the vacuum chamber, placed in an autoclave, and treated at 130 ° C and 10 bar to finally produce a curved laminated glass.

It was confirmed that the prepared curved laminated glass has a curvature radius of about 1000 R on the convex surface and a curvature radius of about 1300 R on the concave surface. In addition, it was confirmed that cracks and buckling were not generated in the curved thin plate glass included in the manufactured curved laminated glass, and that there was no lifting and bubbling between the curved thin plate glass and the bonding layer and between the curved thick plate glass and the bonding layer Respectively.

Example  2

The same thick plate glass and thin plate glass as in Example 1 were prepared. Thereafter, a curved plate glass having a curvature radius of about 1000 R was produced in the same manner as in Example 1. Thereafter, a thermoplastic polyurethane film (EASTMAN) having an elastic modulus of 505 Mpa was prepared as a bonding layer, the bonding layer was formed into a curved surface, and one side and the other side of the bonding layer were polished so that the curvature radius of one side was about 1000 R, A bonded layer of a curved surface having a radius of curvature of about 1400 R was prepared.

Thereafter, a curved laminated glass was produced in the same manner as in Example 1 above. It was confirmed that the prepared curved laminated glass has a curvature radius of about 1000 R on the convex surface and a curvature radius of about 1400 R on the concave surface. In addition, it was confirmed that cracks and buckling were not generated in the curved thin plate glass included in the manufactured curved laminated glass, and that there was no lifting and bubbling between the curved thin plate glass and the bonding layer and between the curved thick plate glass and the bonding layer Respectively.

Comparative Example  One

The same thick plate glass and thin plate glass as in Example 1 were prepared. Thereafter, a curved plate glass having a curvature radius of about 1000 R was produced in the same manner as in Example 1. Thereafter, a thermoplastic polyurethane film (EASTMAN) having an elastic modulus of 505 Mpa was prepared as a bonding layer, and a bonding layer of a curved surface having a radius of curvature of about 1000 R on one side and the other side was prepared.

Thereafter, the thin plate glass was elastically deformed on the other surface of the bonding layer in the same manner as in Example 1 above. It was found that the peeling occurred between the elastically deformed thin plate glass and the bonding layer and that a large number of breakages occurred in the elastically deformed thin plate glass.

Comparative Example  2

The same thick plate glass and thin plate glass as in Example 1 were prepared. Thereafter, a curved plate glass having a curvature radius of about 1000 R was produced in the same manner as in Example 1. Thereafter, a thermoplastic polyurethane film (EASTMAN) having an elastic modulus of 505 Mpa was prepared as a bonding layer, the bonding layer was formed into a curved surface, and one side and the other side of the bonding layer were polished so that the curvature radius of one side was about 1000 R, A bonding layer of a curved surface having a radius of curvature of about 1900 R was prepared.

Thereafter, the thin plate glass was elastically deformed on the other surface of the bonding layer in the same manner as in Example 1 above. It was confirmed that cracks and buckling were not generated in the curved thin plate glass included in the manufactured curved laminated glass. However, when the curved laminated glass was observed through the curved laminated glass, it was confirmed that the shape of the object was visually greatly distorted.

Comparative Example  3

The same thick plate glass and thin plate glass as in Example 1 were prepared. Thereafter, a curved plate glass having a curvature radius of about 1000 R was produced in the same manner as in Example 1. Then, a liquid pressure sensitive adhesive (UVLAM, Kalentec) was applied on the concave side of the curved thick plate glass.

Thereafter, laminated glass was laminated on a liquid adhesive in a vacuum chamber, the vacuum chamber was sealed, and the laminate was compressed by a vacuum ring at about 20 ° C and 0.4 torr. However, it was confirmed that the laminated glass was not elastically deformed.

Accordingly, the method of manufacturing a curved thin plate glass according to an embodiment of the present invention can easily bond a curved thin plate glass having a different radius of curvature to a curved plate glass. In addition, the mechanical properties and / or optical properties of the curved thin plate glass to be produced can be excellent.

100: Plate glass
200: bonding layer
300: Sheet glass

Claims (16)

A bonding layer including a first side having a first radius of curvature and a second side having a second radius of curvature;
A curved surface plate glass provided in contact with one surface of the bonding layer; And
And a curved thin plate glass provided in contact with the other surface of the bonding layer and thinner than the thickness of the curved thick plate glass,
Wherein the first radius of curvature is smaller than the second radius of curvature. The method according to claim 1,
Wherein the ratio of the first radius of curvature to the second radius of curvature is from 1: 1.2 to 1: 1.8. The method according to claim 1,
Wherein the second radius of curvature is 1200 R or more and 5000 R or less. The method according to claim 1,
Wherein the bonding layer has a curved surface or a curved surface. The method according to claim 1,
Wherein one side of the bonding layer is matched with the concave side of the curved plate glass and the other side of the bonding layer is matched with the convex side of the curved thin plate glass. The method according to claim 1,
And a compressive stress is formed on the opposite side of the curved thin plate glass surface adjacent to the curved thickened plate glass. The method according to claim 1,
Wherein the thickness ratio of the curved thick plate glass to the curved thin plate glass is 1: 0.1 to 1: 0.5. The method according to claim 1,
Wherein the thickness of the curved thin plate glass is 0.3 mm or more and 1.0 mm or less. Preparing a curved plate glass;
Preparing a bonding layer comprising a first side having a first radius of curvature and a second side having a second radius of curvature;
Bonding one surface of the bonding layer to a concave surface of the curved plate glass;
Positioning a thin plate glass plate thinner than the thickness of the curved plate glass on the other side of the bonding layer; And
And elastically deforming the laminated glass to bond the laminated glass on the other side of the bonding layer to produce a curved laminated glass,
Wherein the first radius of curvature is smaller than the second radius of curvature. The method of claim 9,
Wherein the ratio of the first radius of curvature to the second radius of curvature is from 1: 1.2 to 1: 1.8. The method of claim 9,
Wherein the second radius of curvature is 1200 R or more and 5000 R or less. The method of claim 9,
Wherein the bonding layer has a curved surface or a curved surface. The method of claim 9,
Wherein the elastic modulus of the bonding layer is not less than 10 MPa and not more than 3000 MPa. The method of claim 9,
Wherein the bonding layer is solid at a temperature of 25 占 폚 or more and 140 占 폚 or less. The method of claim 9,
Wherein said thin plate glass is elastically deformed at a temperature of 20 DEG C or more and 35 DEG C or less. The method of claim 9,
Further comprising a step of post-treating the curved laminated glass at a temperature of 80 ° C or more and 140 ° C or less and a pressure atmosphere of 5 bar or more and 20 bar or less.

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