KR102095109B1 - Film for laminating glasses, laminated glasses comprising of the same, manudacturing method for the same - Google Patents

Abstract

The present invention relates to a film for laminated glass and a method for manufacturing the same, wherein one side of the film includes a first concave-convex shape including a plurality of convex portions and concave portions positioned between the convex portions adjacent to each other, and The other surface includes a second concavo-convex shape including a plurality of convex portions and a concave portion positioned between the convex portions adjacent to each other, and a first concave portion of the first surface concave-convex shape located within a unit area of the film The distance value between the concave portion of the second surface concavo-convex shape, which is located in parallel with the first concave portion, is the second concavo-convex portion which is located parallel to the second concave portion of the first surface concave-convex shape and the second concave portion. Provides a distance value between the third concave portions of the shape and a film for different glass bonding. The film for laminated glass does not generate a diffraction interference phenomenon even though it has a pattern on the surface, and is excellent in deaeration performance, edge sealing function, and the like.

Description

FILM FOR LAMINATING GLASSES, LAMINATED GLASSES COMPRISING OF THE SAME, MANUDACTURING METHOD FOR THE SAME

The present invention relates to a film for laminated glass, a laminated glass comprising the same, and a method for manufacturing the same, and relates to a film for laminated glass having excellent degassing performance and having little diffraction interference pattern due to embossing pattern.

Polyvinyl acetal is used as a laminated glass (safety glass) or an intermediate layer of light transmitting laminate (film for laminated glass). Laminated glass is mainly used for building windows, exterior materials, and automobile window panes, etc. It does not scatter even when damaged, and it does not allow penetration even when hitting a certain strength.It is applied to objects or persons located therein. Stability can be secured to minimize damage or injury.

The interlayer for laminated glass has a number of fines to prevent blocking of the interlayers on its surface, handling work when overlapping the glass plate and the interlayer (slip property with the glass plate), and degassing during the bonding process with the glass plate. Emboss is formed.

When the interlayer for laminated glass with embossed is used as the interlayer for laminated glass, there is a possibility that interference patterns or bubbles may occur in the laminated glass due to the effect of emboss located on both sides of the intermediate layer, and visibility may be deteriorated. have.

Domestic Patent Publication No. 10-2017-0066279, Publication date: June 14, 2017, Interlayer film for laminated glass, rolled body, manufacturing method of laminated film, interlayer film for laminated glass, and method of manufacturing rolled body Domestic Patent Publication No. 10-2017-0069176, Publication date: June 20, 2017, Interlayer film for laminated glass and laminated glass

An object of the present invention is to provide a film for laminated glass and the like having excellent degassing performance and having little diffraction interference fringe caused by an embossed pattern.

In order to achieve the above object, the film for laminated glass according to an embodiment of the present invention has a first surface irregularity shape including a plurality of convex portions on one surface of the film and concave portions positioned between the convex portions adjacent to each other. The second surface of the film includes a plurality of convex portions and a second concavo-convex shape including a concave portion located between the convex portions adjacent to each other, and located within a unit area (1 cm ² ) of the film The distance value (d1) between the first concave portion of the first concavo-convex shape and the second concave portion of the second concavo-convex shape located close to the first concave portion is the third concave portion of the first concavo-convex shape It is different from the distance value (d2) between the fourth concave portion of the second surface concavo-convex shape located close to the portion and the third concave portion.

The average depth of the concave portion included in the first concavo-convex shape may be 10% or less of the total thickness of the film.

The concave portion may have an average width of 2 to 120 μm.

The distance value between the concave portion A included in the unit area (1 cm ² ) of the one surface and the concave portion A adjacent to the concave portion B is a concave portion B of the one surface and a concave portion adjacent to the concave portion B The distance between the values may be different.

The shape of the concave portion of the first surface concavo-convex shape and the shape of the concave portion of the second surface concavo-convex shape located within the unit area (1 cm ² ) of the film may be different from each other.

The shape of the concave portion of the first surface concavo-convex shape and the shape of the concave portion of the second surface concavo-convex shape located within the unit area (1 cm ² ) of the film may be different from each other.

The first concavo-convex shape includes the convex portion and a concave portion surrounding the convex portion, and an outline of the convex portion may form a single closed curve.

The contour of the convex portion has a polygonal shape, and an angle at a vertex of the polygon may be 40 º or more and less than 180 º.

A method of manufacturing a film for laminated glass according to another embodiment of the present invention includes a plurality of non-protrusions and protrusions surrounding each of the non-protrusions and connected to each other, but the first concave-convex shape transfer device is not the same in shape. And a second concave-convex transfer device respectively applied to one surface and the other surface of the film, the one surface having a plurality of convex portions corresponding to the shape of the first concave-convex transfer device and concave portions positioned between the convex portions adjacent to each other It includes a first concavo-convex shape, and the second surface includes a second concavo-convex shape including a plurality of convex portions corresponding to the shape of the second concave-convex transfer device and concave portions positioned between the convex portions adjacent to each other. the inclusion, and the unit area of the film (1 cm ²⁾ in a position wherein the side by side location of the first recess and the first recess of the first surface irregularities second surface yo The distance value (d1) between the second concave portions of the shape is the distance between the third concave portion of the first surface concave-convex shape and the fourth concave portion of the second surface concave-convex shape located in parallel with the third concave portion And a transfer step of manufacturing a film for laminated glass different from the value (d2).

The film for laminated glass of the present invention and a method for manufacturing the same have almost no occurrence of diffraction interference fringes due to embossed patterns, although the film has a pattern on the surface, and has excellent degassing performance, edge sealing function, and the like.

1 is a conceptual view illustrating a part of a cross section of a film for laminated glass manufactured according to an embodiment of the present invention.
Figure 2 is a conceptual diagram illustrating in relation to the surface irregularities and cross-sections respectively located on one surface and the other surface of the film for laminated glass manufactured according to an embodiment of the present invention.
Figure 3 is a conceptual diagram illustrating some shapes of the uneven shape of the uneven shape transfer device applied in an embodiment of the present invention.
4 is a cross-sectional photograph of a three-layer film sample prepared in an embodiment of the present invention and the cross section observed with an optical microscope.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily practice. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The same reference numerals are used for similar parts throughout the specification.

As used herein, the terms "about", "substantially", and the like are used in or at a value close to that value when manufacturing and material tolerances specific to the stated meaning are presented, and the understanding of the invention To aid, accurate or absolute figures are used to prevent unconscionable abusers from unduly using the disclosed disclosure.

Throughout the present specification, the term “combination of these” included in the expression of the marki form means one or more mixtures or combinations selected from the group consisting of the elements described in the expression of the marki form, wherein the component It means to include one or more selected from the group consisting of.

Throughout this specification, the description of “A and / or B” means “A, B, or A and B”.

Throughout this specification, terms such as “first”, “second” or “A” and “B” are used to distinguish the same terms from each other, unless otherwise specified.

In the present specification, B on A means that B is directly in contact with A or B is located on A while another layer is in between, and B is placed on the surface of A. It is not limited to being interpreted.

In the present specification, a singular expression is interpreted to include a singular or plural number that is interpreted in context unless otherwise specified.

In the present specification, the polygon refers to a two-dimensional shape having three or more sides, and includes triangles, squares, pentagons, hexagons, and the like, and includes all or part of a polygonal shape such as a circle, an ellipse, etc. Also included.

The inventors of the present invention, when a pattern of a certain pattern is formed on one side and the other side of the film, an optical interference phenomenon occurs, thereby deteriorating optical properties on the film for laminated glass, and to avoid such a phenomenon, irregular spots are located on one side and the other side of the film. While research is being conducted to solve the problem that degassing performance may be deteriorated by applying the method, the convex and concave lines between the convex portions that are substantially polygonal shapes and concave lines are connected to each other by utilizing an atypical linear pattern. When the shape was applied, it was confirmed that all of the conflicting properties required for the film for laminated glass having an emboss pattern such as optical interference phenomenon and degassing performance were simultaneously satisfied, and the present invention was completed.

1 is a conceptual diagram illustrating a part of a cross section of a film for laminated glass manufactured according to an embodiment of the present invention, and FIG. 2 is a surface on one surface and the other surface of a film for laminated glass manufactured according to an embodiment of the present invention It is a conceptual diagram explaining in connection with a part of the uneven shape and a cross section, and FIG. 3 is a conceptual diagram illustrating some shapes of the uneven shape of the uneven shape transferring apparatus applied in one embodiment of the present invention. Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 3.

The film 600 for laminated glass according to an embodiment of the present invention has a first surface unevenness on one surface of the film including a plurality of convex portions 100 and concave portions 200 positioned between the convex portions adjacent to each other. The second surface of the film includes a shape 500, and the second surface of the film includes a second concavo-convex shape 500 including a plurality of convex portions 100 and concave portions 200 positioned between the convex portions adjacent to each other. .

Between the first concave portion of the first surface concavo-convex shape located within the unit area (1 cm ² ) of the film 600 and the second concave portion of the second surface concavo-convex shape located close to the first concave portion The distance value d1 is different from the distance value d2 between the third concave portion of the first concavo-convex shape and the fourth concave portion of the second surface concavo-convex shape located close to the third concave portion ( 1 and 2). When the values of d1 and d2 are different, optical distortion due to interference phenomenon does not occur, and a glass bonding film having an embossed pattern and having excellent optical properties can be provided.

Specifically, each of d1 and d2 may have a value of 2.5 mm or less, and may have a value of 0.002 to 2.2 mm. When the values of d1 and d2 are within the above range, an embossing pattern capable of simultaneously satisfying degassing performance and sealing performance may be formed.

The average depth Wh of the concave portion 200 included in the first concavo-convex shape 500 may be 10% or less of the total thickness of the film, 9% or less, and 6% or less. In addition, the average depth of the concave portion may be 0.2 to 6% of the total thickness of the film, and may be 0.5 to 4%.

When the recess 200 is formed at such a depth, a recess having excellent degassing performance may be formed. However, if the average depth of the concave portion is too large, it is preferable to form it in the above range because the pattern does not disappear depending on the bonding conditions in this bonding process, so that bubbles may be formed on the edges or some uneven shape may remain.

Specifically, the average depth Wh of the concave portion may be 80 μm or less, 70 μm or less, and 60 μm or less. In addition, the average depth Wh of the concave portion may be 3 to 55 μm, and may be 5 to 45 μm.

The depth Wh of the concave portion means a length from an imaginary surface extending from the convex portion 100 to the bottom of the concave portion.

In this case, it has a sufficient height difference, so that even in the temporary bonding process during the subsequent glass bonding process, all the surface irregularities are maintained without disappearing, and sufficient degassing performance may be obtained.

The concave portion may have an average width Wc of 2 to 120 μm, and 10 to 70 μm. The width Wc of the concave portion refers to a width of the concave portion on a virtual surface extending from the convex portion 100.

The distance value between the concave portion A and the concave portion A adjacent to the concave portion B included in an arbitrary unit area (1 cm ² ) of one surface of the film 600 for the laminated glass is the concave portion B and the The distance value between the concave portion B and the adjacent concave portion C may be different.

In addition, the distance value between the concave portion A and the concave portion A and the adjacent concave portion B included in an arbitrary unit area (1 cm ² ) of the other surface of the film 600 for laminated glass is a concave portion B of the other surface. And the distance between the concave portion B and the adjacent concave portion C may be different from each other.

The cross-sectional shape of the concave portion 200 may be generally a quadrangular shape, a semicircular shape, an inverted triangle, etc., and if the shape is concave, the shape is not particularly limited.

The shape of the concave portion of the first surface concavo-convex shape and the shape of the concave portion of the second surface concave-convex shape located in the unit area (1 cm ² ) of the film may be different (see FIG. 2).

The concave portion 200 serves as a passage through which air passes in the bonding process, and is not completely lost even after temporary bonding, and a part of the concave portion is maintained to have excellent degassing performance.

In addition, although the recess 200 is formed to have a value within a certain range as a whole, it is possible to manufacture a film for glass bonding having excellent optical properties by preventing its shape from having a regular pattern.

The surface concave-convex shape 500 includes a concave portion 200 and a plurality of convex portions 100 formed as a boundary of the concave portion.

The convex portion 100 is surrounded by the concave portion 200.

In the first convex portion 110 surrounded by the concave portion 200, a line that the first convex portion 110 and the concave portion 200 contact may form a single closed curve.

The first convex portion 110 surrounded by the concave portion 200 may have a polygonal shape with a line connecting the first convex portion 110 and a portion in contact with the concave portion 200.

The polygons may be triangular, square, pentagonal, hexagonal, heptagonal or octagonal, and they may be mixed. The polygon means that it has a substantially polygonal shape, and the concave-convex portion 200 and the first convex portion are formed by pressurizing the concavo-convex forming transfer device such as a plate (or roller) on the film to form the concave-convex shape The line that 110 touches may not necessarily be a straight line, but a part that is shown as a curved line may exist.

The angle at the vertex of the polygon may be more than 40 º and less than 180 º.

The angle at the vertex means an angle at a point where a line connecting between the convex portions 100 and the concave portions 200 adjacent to each other meet, and specifically, the angle may be 45º to 160º have.

The first convex portion 110, which is located in the surface concave-convex shape 500 and is surrounded by the concave portion 200 and does not include a concave portion therein, shares a part of the concave portion 200. It may be adjacent to each other to the seven adjacent convex portions.

In this case, the first convex portion 110 and the adjacent convex portions may have different shapes and different areas. In this way, when the first convex portion and the adjacent convex portions have different shapes and the like, polygonal sizes may be formed in irregular shapes having irregular shapes, which are not identical to each other.

The convex portion 100 may have an average area of 0.01 mm ² to 4.00 mm ² .

The average area is based on the area of the convex portion evaluated based on the unit area (1 cm ² ) of the surface concave-convex shape 500 of the laminated glass film 600.

Specifically, the average area of the convex portion 100 may be 0.05 mm ² to 4.50 mm ² , and may be 0.1 mm ² to 4.50 mm ² . More specifically, the surface concavo-convex shape 500 of the film 600 for laminated glass may be a low-area type having an average area of 0.1 mm ² to 0.5 mm ² of the convex portion 100, and an average area of more than 0.5 mm ² jungmyeon enemy may be of 0.9 mm ² or less, and the average area and this can be of more than 0.9 mm ² 1.5 mm ² or less large area, the average area of 1.5 mm ² than may be of 4.00 mm ² or less invited area.

In addition, the surface irregularities 500 may include 24 to 9,800 pieces of the convex portion 100 per unit area (1 cm ² ).

The surface concavo-convex shape 500 may have a standard deviation of the convex area located within a unit area (1 cm ² ) of 0.01 to 0.4, and may be of 0.05 to 0.35.

When the convex portion 100 is of a low area type, the standard deviation of the area of the convex portion may be 0.01 to 0.1, and when the convex portion 100 is of a medium area type, the standard deviation of the area of the convex portion may be 0.1 to 0.2. In the case where the convex portion 100 is of a large area or an extra large area, the standard deviation of the convex area may be 0.2 to 0.3.

When the standard deviation of the area of the convex portion has such a range, the convex portions 500 are positioned in an irregular pattern throughout the surface asperity shape 500, including the convex portion 100 of a relatively constant size, but the convex portion 100 is relatively even. Can be distributed.

The surface roughness (Rz) of the surface asperity shape 500 may be 30 to 70 days, 30 to 60 days, 32 to 50 days, and 35 to 45 days. In the case of having such a roughness range, a sufficient end sealing effect can be obtained together with excellent degassing performance.

The surface roughness is based on measurement by the method of DIN EN 4287: 2010-7.

The film 600 for laminated glass has a surface concave-convex shape 500 including a plurality of convex portions 100 located on at least a portion or all of the other surface and a concave portion 200 positioned between the convex portions adjacent to each other. ) May be further included.

At this time, the shape of the convex portions included in an arbitrary unit area (1 cm ² ) of one surface of the film 600 for laminated glass is located in a unit area of the other surface of the film 600 for laminated glass facing the one surface. It is characterized by being different from the shape of the convex portions.

In this way, the film 600 for laminated glass has a different shape of convex portions 100 formed on portions of the one surface and the other surface facing each other, and has no regularity, so that diffraction interference fringes do not occur and thus have excellent optical properties. Specifically, the haze value of the glass bonding film 600 may be 10% or less, and 5% or less.

In addition, the film 600 for glass bonding has excellent degassing performance by concave portions directly or indirectly connected to each other positioned between the convex portions, and at the same time has excellent end sealing performance.

The film 600 for laminated glass thus formed may be laminated between a pair of glasses 700 to form the laminated glass 900. The laminated glass 900 may be made of laminated glass by sequentially or simultaneously applying a temporary bonding process and a main bonding process.

In particular, in the temporary bonding process, the film 600 for laminated glass laminated between the glass 700 may be removed by the concave portions 200 in the surface uneven shape, which may be located in the space between the glass and the film. The diffraction interference pattern may be insignificant or not generated due to irregular surface irregularities.

The film 600 for laminated glass according to another embodiment of the present invention includes a surface concavo-convex shape 500 located on at least a part or all of one surface of a film for laminated glass. And a concave portion 200 positioned between the convex portions 100 and the convex portions adjacent to each other.

The convex portions 100 included in the unit area (1 cm ² ) may have different shapes or areas.

The convex portions 100 included in the unit area (1 cm ² ) of the surface concave-convex shape 500 may have an area in which 80% or more of the convex portions satisfy Equation 1 below.

[Equation 1]

0.4 x Sm ≤ Sni ≤ 1.6 x Sm

In Equation 1, Sni is the area of the convex portion, and Sm is the average area of the convex portions in the unit area where the convex portion is located.

Specifically, the convex portions 100 included in the unit area (1 cm ² ) of the concave-convex shape may be more than 90% of the convex portions satisfying Equation 1.

In the film 600 for glass bonding having the concave-convex shape 500 having the convex area condition, the convex parts 100 having different shapes or areas are positioned with the concave parts 200 therebetween. The overall size of the parts is maintained within a certain range, and at the same time, has a surface irregularity shape 500 having an irregular shape as a whole, and even when the surface irregularities 500 overlap, it has excellent degassing performance without generating diffraction interference fringes. You can.

The line drawn along the concave portion 200 starting at a point (starting point) at which one end of the surface concave-convex shape 500 and the concave portion 200 are in contact with the end of the surface concave-convex shape 500 The point in which the concave portion 200 is in contact may be connected to a point (end point) equal to or different from the starting point.

The convex portion 100 may be surrounded by the concave portion 200, and the description of the film for laminated glass overlapping with that described in one embodiment of the present invention is omitted.

Hereinafter, the composition and the like of the film for laminated glass will be described.

The film for laminated glass includes a first layer that is light transmissive, and the first layer may be a polyvinyl acetal layer, an ironomer layer, a polyethylene terephthalate layer, or a polyimide layer.

The polyvinyl acetal layer may include a polyvinyl acetal resin and a plasticizer, and specifically, may include 60 to 76% by weight of polyvinyl acetal resin, and 70 to 76% by weight. In this case, a relatively high tensile strength and modulus can be imparted to the polyvinyl acetal layer.

The polyvinyl acetal resin may have an acetyl group content of less than 2 mol%, and may specifically be 0.01 to 2 mol%. The polyvinyl acetal resin may have a hydroxyl group content of 30 mol% or more, specifically 30 to 50 mol%,

The polyvinyl acetal resin may be a polyvinyl acetal resin obtained by acetalizing polyvinyl alcohol having a polymerization degree of 1,600 to 3,000, and a polyvinyl acetal resin obtained by acetalizing polyvinyl alcohol having a polymerization degree of 1,700 to 2,500. Can be When such a polyvinyl acetal resin is applied, mechanical properties such as penetration resistance can be sufficiently improved.

The polyvinyl acetal resin may be a synthesis of polyvinyl alcohol and aldehyde, and the type of the aldehyde is not limited. Specifically, the aldehyde may be any one selected from the group consisting of n-butyl aldehyde, isobutyl aldehyde, n-barrel aldehyde, 2-ethyl butyl aldehyde, n-hexyl aldehyde and blend resins thereof. When the n-butyl aldehyde is applied to the aldehyde, the prepared polyvinyl acetal resin may have a refractive index characteristic with a small difference in refractive index of glass and excellent adhesion to glass.

The polyvinyl acetal layer may include the plasticizer at 24 to 40% by weight, and may include it at 24 to 30% by weight. When the plasticizer is included in such a range, it is good in that it is possible to impart appropriate bonding strength and impact resistance to the laminated film for bonding.

The plasticizer includes triethylene glycol bis 2-ethylhexanoate (3G8), tetraethylene glycol diheptanoate (4G7), triethylene glycol bis 2-ethylbutyrate (3GH), triethylene glycol bis 2-heptanoate ( 3G7), dibutoxyethoxyethyl adipate (DBEA), butyl carbitol adipate (DBEEA), dibutyl sebacate (DBS), bis 2-hexyl adipate (DHA), and combinations thereof One can be applied, specifically selected from the group consisting of triethylene glycol di-2-ethyl butylate, triethylene glycol di-2-ethylhexanoate, triethylene glycol di-n-heptanoate and combinations thereof. It may include any one, and more specifically, triethylene glycol bis 2-ethylhexanoate (3G8) may be applied.

The polyvinyl acetal resin layer may have a characteristic of 15 to 25 ℃ glass transition temperature measured by differential scanning calorimetry, specifically, may have a characteristic of 17 to 20 ℃. In this case, it may exhibit excellent sound insulation properties at room temperature.

The ionomer is a princess complex comprising an olefin repeating unit and a carboxylic acid repeating unit, and an ionic compound containing a metal ion in an acidic functional group may be applied.

Specifically, the ironomer may be an olefin-based ionomer, and more specifically, a copolymer of a repeating unit derived from an alpha olefin having 2 to 4 carbon atoms and an alpha, beta-ethylenically unsaturated carboxylic acid repeating unit having 3 to 6 carbon atoms. Can be In the ionomer, an ionic compound containing a metal ion may be applied to the side chain having the acidic functional group.

The ionomer may include the olefin-based repeating unit in 20 to 95% by weight, 20 to 90% by weight, 40 to 95% by weight, and 40 to 75% by weight can do. The carboxylic acid repeating unit may include 5 to 80% by weight, 10 to 80% by weight, 5 to 60% by weight, and 25 to 60% by weight. .

As the metal ion, a monovalent, divalent or trivalent metal ion may be applied, specifically Na ⁺ , K ⁺ , Li ⁺ , Cs ⁺ , Ag ⁺ , Hg ⁺ , Cu ⁺ , Be ^{2 +} , Mg ^{2 +} , Ca ^{2 +} , Sr ^{2 +} , Ba ^{2 +} , Cu ^{2 +} , Cd ^{2 +} , Hg ²⁺ , Pb ^{2 +} , Fe ^{2 +} , Co ^{2 +} , Ni ^{2 +} , Zn ^{2 +} , Al ^{2 +} , Sc ^{3 +} , Fe ^{3 +} , Al ^{3 +} and Yt ^{3 +} can be applied. Specifically, it is preferable to apply Mg ²⁺ , Na ⁺ and Zn ²⁺ as the metal ion.

The ionomer may be a copolymer of an ethylenic repeating unit having 2 to 4 carbon atoms and an ethylenically unsaturated carboxylic acid repeating unit having 3 to 6 carbon atoms, and contains 5 mol% or more of an acidic side chain, and the acidic side chain is the metal. It may be an ionic compound capable of binding to ions.

The polyethylene terephthalate resin may have a crystallinity of 0% to 80%, 10% to 70%, and more specifically 40% to 60%. The polyethylene terephthalate resin may be a copolymer resin, and the copolymerized polyethylene terephthalate may be a copolymer of ethylene glycol and neopentyl glycol as glycol components.

The polyimide resin is a resin prepared by imidizing a polyamic acid derivative by solution polymerization of an aromatic dianhydride and an aromatic diamine or an aromatic diisocyanate, and specifically, an aromatic acid dianhydride containing biphenyltetracarboxylic dianhydride. It may be obtained by imidizing a polyamic acid resin synthesized from an aromatic diamine containing water and para-phenylene diamine, but is not limited thereto.

The film 600 for laminated glass may have a structure in which the above-mentioned layers are stacked on each other, and specifically, may have a three-layer structure of a first layer-second layer-first layer.

The second layer may be a sound insulation layer, for example. When the sound insulating layer is a polyvinyl acetal resin layer, the polyvinyl acetal resin may include 54 to 76% by weight, may include 60 to 70% by weight, and may include 24 to 46% by weight of a plasticizer, 30 It may contain from 40 to 40% by weight.

The polyvinyl acetal resin of the sound insulating layer may have an acetyl group content of 8 mol% or more, and specifically, may be 8 to 30 mol%. In addition, the polyvinyl acetal resin of the sound insulating layer may have a hydroxyl group content of 18 mol% or less, and may be 6 to 15 wt%. In this case, the sound insulation of the film may be further improved.

The manufacturing method of the film 600 for laminated glass according to another embodiment of the present invention includes a plurality of non-protrusions 10 and protrusions 20 surrounding the non-protrusions and connected to each other. Is applied to each of the first and second surfaces of the first uneven shape transferring device 1000 and the second uneven shape transferring device 1000, the one surface corresponding to the shape of the first uneven shape transferring device It includes a first concave-convex shape 500 including a concave portion 200 positioned between the convex portions 100 and the convex portions adjacent to each other, and the other surface is the shape of the second concave-convex shape transfer device. And a second surface irregularity shape 500 including a plurality of corresponding convex portions and concave portions 200 positioned between the adjacent convex portions 100, and the unit area of the film (1 cm ² ) The first concave and concave portion of the first surface irregularities located in the The distance value (d1) between the second concave-convex second concave portion positioned parallel to the first concave portion is the third concave portion of the first surface concave-convex shape and the third concave portion parallel to the third concave portion. And a transfer step of manufacturing a film for laminated glass different from the distance value (d2) between the second concave-convex fourth recess.

The surface concavo-convex shape 500 includes a plurality of convex portions 100 and concave portions 200 positioned between the convex portions adjacent to each other on some or all of one surface of the film.

The convex portion 100 may have a shape surrounded by the concave portion 200.

Before the transfer step, a film manufacturing step of manufacturing a film for laminated glass by applying a polymer resin and a plasticizer may be further included. The contents of the polymer resin and the plasticizer overlap with the contents described above, and thus the description thereof is omitted. In addition, the film manufacturing step for laminated glass can be applied if it is a method for producing a film, for example, a coextrusion method can be applied.

The uneven shape transfer device 1000 may be in the form of a roll or a plate, and there is no limitation on the shape.

The transfer may be performed at a temperature condition of 30 to 150 ℃.

When the roll form is applied to the uneven transfer device 100, the transfer may be performed at a line pressure of 20 N / mm to 100 N / mm.

When the transfer is performed in this temperature and pressure range, a film 600 having excellent degassing performance and end sealing performance can be manufactured.

The design process of the uneven shape transfer device 1000 will be described.

A number of points corresponding to the number of convex portions to be formed is formed on a reference plane having a constant size. The points are randomly generated without a certain pattern in their position and spacing, and if the distance between neighboring points is less than a preset value, the point is deleted and if it is greater than the set value, the points are irregularly arranged. Shape the reference point (process of forming the reference point).

An outline (first outline), which is a line vertically bisecting a virtual line connecting adjacent reference points, is formed, but the outline (first outline) ends at a point where it meets an outline (second outline) formed between different reference points. (Outline drawing process).

When the outlines fill the reference plane, the protrusions 20 are formed by giving a constant thickness to the reference plane based on the outlines, and the unevenness includes an uneven shape having a plurality of non-protrusions 10 surrounded by the protrusions. A shape transfer device is manufactured (transfer device formation step).

The non-protruding portion 10 may have an average area of 0.01 mm ² to 4.00 mm ² , and the non-protruding portion 10 is a polygonal shape surrounded by the protruding portions 20 so that the first protrusions have a shape or area of each other. It is different from neighboring protrusions.

The concave-convex shape transfer device 1000 is transferred onto one surface of the film in the manner described above, and forms a film 600 for laminated glass including a convex portion 100 and a concave portion 200.

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

1) Uneven pattern design and embossed pattern manufacturing

The 810,000 points are irregularly positioned on the unit plane of 45 cm each, and a solid line is drawn perpendicular to the imaginary line connecting the points adjacent to each other, but the solid line draws up to a position in contact with any other solid line. Patterns were designed in a manner. At this time, the irregularity means that the distance of each point is not constant.

Specifically, after placing 800,000 points randomly on the unit plane, if the distance between neighboring points is less than a preset value, the point is deleted and if it is greater than the set value, the point is irregularly added. The placed reference points were generated. The dots formed in this way draw about 800,000 polygons in the manner described above, such as drawing a solid line perpendicular to the line of addition that connects the neighboring points, and the completed pattern is convex and the area of the polygon is concave. It was made of an embossed plate with a first pattern, its depth was 40 μm, and the width of the convex solid line was applied at about 50 μm. The appearance of the produced embossed plate is as shown in FIG. 1. However, the transcription was conducted after the sanding process.

The pattern is formed in the same manner as above, but the embossed plate with the second pattern and about 400,000 dots are positioned in a manner that irregularly place about 1.4 million dots on a unit plane of 45 cm each. Embossed plates having three patterns were each manufactured.

When evaluated on the basis of the embossed plate having the first pattern, the shape of the convex portion, which is a solid line surrounding the polygon, includes about 225 polygons per 1 cm of unit area (1 cm ² ), and the shape of the solid line or the intersection non-uniformity It was confirmed that it was not observed.

2) Transfer of embossed pattern to film

The pattern was transferred to both sides of a polyvinyl butyral film (manufactured by SKC) using an embossed plate having the first pattern prepared above. At this time, the transfer (LSminating) is a sample film 1 when proceeding at 90 ° C for 5 minutes, a sample film 2 when proceeding at 80 ° C for 5 minutes, and a sample film 3 when proceeding at 70 ° C for 5 minutes. The samples were prepared, and experiments were conducted below using them.

The polyvinyl butyral film is a monolayer film extruded by adding 73% by weight of polyvinylbutylal resin and 27% by weight of a plasticizer, and a film having the same composition as the above as a skin layer, and a polyvinylbutylal resin as a core layer in the center. A three-layer sound insulating film prepared by coextrusion by adding 63% by weight and 37% by weight of a plasticizer was prepared and applied to the experiment.

3) Evaluation of surface roughness

Surface roughness was measured according to DIN EN 4287: 2010-7. As a result of the measurement, it was confirmed that sample film 1 has a roughness (Rz) of 37 to 45 μm, sample film 2 of 40 to 48 μm, and sample film 3 of 34 to 40 μm.

4) Evaluation of convex area, concave width and depth

The area of the convexity was evaluated by the following method.

After photographing the surface of the prepared sample film using an optical microscope, a unit area was selected, and a drawing for area calculation was made by forming a line connecting the convex and concave portions included in the unit area (FIG. 1) Reference). In the drawing, all the areas of the convex portions were summed and evaluated, and the area values of the convex portions calculated by calculating 10 or more different portions as samples were averaged to be the convex portion values of each sample.

As a result of the measurement, the sample film 1 was evaluated to have an average area value of about 0.5 mm ² and a standard deviation of the area distribution of about 0.13, and the sample film 2 had an average area value of about 0.3 mm ² and an area distribution standard. The deviation was evaluated to be about 0.07, and the sample film 3 was evaluated to have an average area value of about 1 mm ² and a standard deviation of the area distribution of about 0.25.

The width and depth of the recess were evaluated as follows.

The cross section of the sample film was observed using an optical microscope, and the depth and width of the recess were measured. The depth and width of the concave portion within 1 cm of the cross section were measured, but after observing at 10 or more cross sections of different parts of the sample, the average value was taken as the width and depth of the concave portion. Based on the sample film 2, the width of the concave portion was observed to be 40 to 55 μm and the depth to 30 to 45 μm. In addition, it was confirmed that d1 and d2 are different from the optical microscope photograph of FIG. 4 (the photograph of FIG. 4 is a photograph of a three-layer film sample having sound insulation performance, d1 is about 0.10 mm, d2 is about 0.08 mm).

5) Evaluation of degassing performance

Degassing performance was performed by an evaluation method using a vacuum ring device.

Specifically, after placing the sample films (diameter 320 mm) between circular glass plates to prepare a laminate, a vacuum ring device was installed on the laminate to vacuum the degassing performance measuring device using a vacuum pump. .

Degassing performance was measured by changing the temperature of the laminate in a sufficiently evacuated state and checking whether the degree of vacuum was maintained. This applies the principle that the vacuum degree falls when the pattern formed on the sample film collapses, and the pressure at which the vacuum degree is maintained at 20 ° C, 30 ° C, and 40 ° C for each temperature was measured 30 seconds after each temperature was reached and the result was obtained. It is shown in Table 1 below. All of the samples showed good degassing performance.

Sample number Degassing performance (20 ℃, cm Hg) Degassing performance (30 ℃, cm Hg) Degassing performance (40 ℃, cm Hg) Sample Film 1 67 65 60 Sample Film 2 70 70 66 Sample Film 3 59 38 30

6) Edge sealing evaluation

If the edge sealing is not sufficient during the preliminary joining process, bubbles are generated at the edge portion, which may cause defects. After pre-bonding, the edge sealing quality was evaluated by the presence of bubbles on the edges and the number of bubbles generated.

Specifically, three samples were prepared by bonding the sample films between two sheets of 2.1 cm flat glass. Each of the samples was 1000 mm wide and the length of the edge slope of one sample was 4 m in total, and each of the three samples was prepared to evaluate edge sealing at a total of 12 m. For sample preparation, a method of main bonding at 110 ° C for 15 minutes after degassing using a vacuum ring at 20 ° C for 5 minutes was applied.

Evaluated with the naked eye, the number of bubbles generated within 5 mm from the edge was displayed to evaluate the degree of edge sealing, and the results were evaluated by repeating twice to evaluate the total number of bubbles.

All of the above samples were confirmed to have generated less than 30 bubbles, and thus exhibited excellent properties as a whole. In particular, in the case of Sample 2, it was evaluated that bubbles were less than 1, so that bubbles were not substantially generated.

7) Penetration resistance evaluation

The penetration resistance of laminated glass was evaluated according to KS L 2007.

Prepared in a laminated structure of film-glass for glass-laminated glass by applying 300 mm × 300 mm of 2.1 cm thick glass and the above sample films 1 to 3, respectively, and pre-bonded by vacuum to degas and edge sealing. Did. Subsequently, the specimen was fabricated by bonding at 150 ° C. for 2 hours using an autoclave. Thereafter, a 2.26 kg steel ball was dropped on the specimen, and the height (MBH) through which the specimen penetrated was measured. At this time, it was evaluated as Fail when piercing at a height of less than 4 m, and Pass when piercing at a height of 4 m or higher.

The laminated glass prepared by applying each of the sample films 1 to 3 was evaluated as a pass.

8) Impact resistance evaluation

In accordance with KS L 2007: 2008, the presence or absence of the laminated glass was evaluated for impact resistance evaluation.

The process of manufacturing and bonding the laminated structure of film-glass for glass-bonded glass by applying 2.1 cm thick glass and sample films 1 to 3, respectively, was performed in the same manner as in the penetration resistance evaluation above.

The low-temperature evaluation is when a steel ball of 227 g is stored at 20 ° C. for 4 hours, and then dropped at a height of 9 m, and when the impacted specimen is broken and the glass is scattered or the amount of glass falling from the sheet is 15 g or more, impact is applied. When the received specimen was not broken or the glass was scattered and the amount of glass falling from the sheet was less than 15 g, it was denoted as Pass.

At room temperature evaluation, after storing 227 g of steel balls at 40 ° C. for 4 hours, the specimen that was impacted at a height of 10 m is broken and the glass is scattered or the amount of glass falling from the sheet is Fail, and the specimen is impacted. If the amount of glass falling off the sheet due to this unbreakable or scattered glass was less than 15 g, it was denoted as a pass.

The laminated glass produced by applying each of the sample films 1 to 3 was evaluated as a pass in both low temperature evaluation and room temperature evaluation.

The preferred embodiments of the present invention have been described in detail above, but the scope of the present invention is not limited to this, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1000: irregular shape transfer device
10: non-protrusion 20: projection
100: convex portion 110: first convex portion
200: concave 500: surface irregularities
600: film for laminated glass, film
Wc: Width of the recess Wh: Height of the recess
d1: the distance value between the first recess and the second recess
d2: distance value between the third recess and the fourth recess

Claims (9)

One surface of the film includes a first concavo-convex shape including a plurality of convex portions and concave portions positioned between the convex portions adjacent to each other,
The other surface of the film includes a second concavo-convex shape including a plurality of convex portions and concave portions positioned between the convex portions adjacent to each other,
The distance value between the first concave portion of the first surface concavo-convex shape located within the unit area (1 cm ² ) of the film and the second concave portion of the second surface concavo-convex shape located close to the first concave portion ( d1) is different from the distance value d2 between the third concave portion of the first surface concavo-convex shape and the fourth concave portion of the second surface concavo-convex shape located close to the third concave portion,
The convex portion shape of the first surface concavo-convex shape and the convex portion shape of the second surface concavo-convex shape located within the unit area (1 cm ² ) of the film are different from each other,
The convex portions included in the unit area (1 cm ² ) of the first concavo-convex shape have an area where 80% or more of the convex portions satisfy the following Equation 1,
The outline of the convex portion of the first concavo-convex shape and the outline of the convex portion of the second surface concave-convex shape have a polygonal shape, and the polygon includes a shape selected from the group consisting of pentagonal, hexagonal, heptagonal and octagonal,
The convex portions of the first surface concavo-convex shape are adjacent to each other with adjacent convex portions sharing a part of the concave portion of the first surface concavo-convex shape,
The convex portions of the second surface concavo-convex shape are adjacent to each other with adjacent convex portions sharing a part of the concave portion of the second surface concavo-convex shape,
The convex portion and the adjacent convex portion of the first concavo-convex shape have different shapes.
The second concavo-convex convex portion and the adjacent convex portion have different shapes, the film for laminated glass:
[Equation 1]
0.4 x Sm ≤ Sni ≤ 1.6 x Sm
In Equation 1, Sni is the area of the convex portion, and Sm is the average area of the convex portions in the unit area where the convex portion is located.
According to claim 1,
The average depth of the concave portion included in the first concavo-convex shape is 10% or less of the total thickness of the film, the film for laminated glass.
According to claim 1,
The concave portion included in the first concavo-convex shape has an average width of 2 to 120 μm, a film for laminated glass.
According to claim 1,
The distance value between the concave portion A included in the unit area (1 cm ² ) of the one surface and the concave portion A adjacent to the concave portion B is a concave portion B of the one surface and a concave portion adjacent to the concave portion B Film for laminated glass, which is different from the distance value between.
According to claim 1,
A film for laminated glass having a shape of a concave portion of the first surface concavo-convex shape and a concave portion of the second surface concavo-convex shape located within a unit area (1 cm ² ) of the film.
delete delete delete A plurality of non-protrusions and protrusions that surround the non-protrusions and are connected to each other, but the first uneven shape transfer device and the second uneven shape transfer device, which are not identical in shape, are applied to one side and the other side of the film, respectively.
The one surface includes a first concavo-convex shape including a plurality of convex portions corresponding to the shape of the first concavo-convex transfer device and concave portions positioned between the convex portions adjacent to each other, and the other surface of the second concavo-convex portion And a second concavo-convex shape including a plurality of convex portions corresponding to the shape of the shape transfer device and concave portions positioned between the convex portions adjacent to each other,
The distance value between the first concave portion of the first surface concave-convex shape and the second concave portion of the second surface concave-convex portion located in parallel to the first concave portion located within the unit area (1 cm ² ) of the film ( d1) is a film for laminated glass different from the distance value (d2) between the third concave portion of the first surface concavo-convex shape and the fourth concave portion of the second surface concave-convex shape located parallel to the third concave portion It includes; a transfer step of manufacturing;
The convex portion shape of the first surface concavo-convex shape and the convex portion shape of the second surface concavo-convex shape located within the unit area (1 cm ² ) of the film are different from each other,
The convex portions included in the unit area (1 cm ² ) of the first concavo-convex shape have an area where 80% or more of the convex portions satisfy the following Equation 1,
The outline of the convex portion of the first concavo-convex shape and the outline of the convex portion of the second surface concave-convex shape have a polygonal shape, and the polygon includes a shape selected from the group consisting of pentagonal, hexagonal, heptagonal and octagonal,
The convex portions of the first surface concavo-convex shape are adjacent to each other with adjacent convex portions sharing a part of the concave portion of the first surface concavo-convex shape,
The convex portions of the second surface concavo-convex shape are adjacent to each other with adjacent convex portions sharing a part of the concave portion of the second surface concavo-convex shape,
The convex portion and the adjacent convex portion of the first concavo-convex shape have different shapes.
The second surface concave-convex convex portion and the adjacent convex portion having different shapes, the manufacturing method of the film for laminated glass:
[Equation 1]
0.4 x Sm ≤ Sni ≤ 1.6 x Sm
In Equation 1, Sni is the area of the convex portion, and Sm is the average area of the convex portions in the unit area where the convex portion is located.

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