CN107619202B - Interlayer film for laminated glass and laminated glass comprising same - Google Patents
Interlayer film for laminated glass and laminated glass comprising same Download PDFInfo
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Abstract
The invention provides an interlayer film for laminated glass and laminated glass containing the same. The intermediate film has patterns on both sides, and the patterns are composed of a plurality of approximately circular bulges. Due to the arrangement of the patterns, the intermediate film can not generate the ripple phenomenon when being used for laminated glass, so that the intermediate film has excellent processability in the cutting or laminating process, and provides good air exhaust in the pre-pressing and jointing process.
Description
The application is a divisional application of Chinese patent application CN2012101934902, and the application date of the original application is as follows: 6/13/2012, the application numbers are: 2012101934902, the name of invention creation is: an interlayer film for laminated glass and laminated glass containing the same.
Technical Field
The present invention relates to an interlayer film for laminated glass having excellent degassing properties, and a laminated glass containing the same. More particularly, to an interlayer film having an irregular circular surface and a laminated glass including the same.
Background
In general, laminated glass is obtained by sandwiching an interlayer film composed of a thermoplastic resin sheet between glass plates, pre-pressing the glass and the interlayer film while degassing air remaining between the glass and the interlayer film by a nip roll (nip roll) or by placing the glass in a rubber bag and evacuating the glass, and then heating the glass by a hot press (autoclave), and is widely used for windows of vehicles, aircrafts, buildings, and the like. When the laminated glass is impacted by external impact, because the glass is still attached to the interlayer after being damaged, the dangerous situation that the glass fragments are scattered can be avoided, and people inside and outside a vehicle or a building at the body can be prevented from being injured by the splashed glass.
The above-mentioned interlayer film is required to have excellent basic properties such as transparency, self-adhesion resistance, adhesion, weather resistance, etc., and also to have other properties such as ease of handling in the step of sandwiching glass plates, degassing property at the time of pre-press bonding, and avoidance of moire (moire) phenomenon, which are important properties required for the interlayer film; among them, the most important is degassing property in the pre-compression bonding of the interlayer film and the avoidance of the moire phenomenon of the interlayer film.
The surface roughness of the intermediate film in the known art contributes to degassing properties during the pre-press bonding of the intermediate film, since the rough surface forms tiny channels between the smooth surface of the glass and the adjacent intermediate film for air to escape when a vacuum is applied under heat during the pre-press bonding of the intermediate film; if the degassing property of the intermediate film is poor, the defects that the laminated glass finished product has bubbles or is partially not completely laminated can be caused, and the degassing property can be measured by the transmittance of the finished product obtained after pre-pressing (the greater the transmittance is, the better the degassing property of the intermediate film is); in order to meet the demand for better degassing of the intermediate film, it is often used to emboss fine concave and convex portions on both surfaces of the intermediate film in a pattern of a plurality of lattices or lines, so that air between the intermediate film and the glass can be smoothly discharged through the channels of the emboss when the intermediate film is preliminarily bonded, thereby increasing degassing. However, in the regular embossing, a moire phenomenon occurs due to interference of diffraction surfaces, and a worker is likely to suffer from a change of a glittering stripe to be dazzled when cutting or processing the interlayer film, thereby causing eye fatigue and dizziness, and lowering workability.
US patent No. US5,455,103 discloses a roughened interlayer having a regular pattern of channels formed on each side of the interlayer, the channels on each side being arranged at an angle to each other, the angle of intersection being at least 25 degrees, to increase the outgassing of the interlayer and to avoid the moire phenomenon of the interlayer film. However, if the temperature at which the degassing starts is not strictly controlled in the pre-press bonding process, the periphery of the laminated glass is sealed first during the pre-press bonding, and the air inside the laminated glass is more difficult to be discharged, so that the degassing is insufficient.
In addition, since the exhaust channels of the interlayer disclosed in the above-mentioned prior art are all stripes in a regular direction, the interlayer can only exhaust from the two ends of the exhaust channel in the regular fixed direction, so that attention must be paid to the processing direction and the forward direction of the exhaust channel of the interlayer during processing, and if the exhaust direction and the exhaust channel are not in agreement, incomplete exhaust in the process of pre-pressing the laminated glass and the interlayer is caused; therefore, the machine direction is limited and inconvenient.
In view of the above, there is still a need for an interlayer film for laminated glass having excellent outgassing property, and further development is needed.
Disclosure of Invention
The present inventors have extensively studied and found that a pattern shape provided on an interlayer film used for laminated glass has a considerable influence on degassing properties in a process of laminating and pressure-bonding glass and the interlayer film, and thus the present invention has been completed.
The technical problem to be solved by the invention is as follows: in view of the above-described drawbacks of the prior art, an interlayer film for laminated glass and a laminated glass including the same are provided, in which the interlayer film does not exhibit a waviness phenomenon during the process of sandwiching between the glasses, thereby improving workability during the process, and is excellent in degassing property during the pre-press bonding process, thereby preventing the generation of bubbles and obtaining a high-quality laminated glass; in addition, no matter which direction the intermediate film is placed in the glass during the process of laminating the intermediate film and the glass, the degassing performance is not affected.
Accordingly, an aspect of the present invention is to provide an intermediate film for laminated glass, which is formed by embossing both surfaces of a sheet made of a thermoplastic resin such that each surface has a plurality of irregular patterns of protrusions having a substantially circular shape, wherein the maximum diameter of the circle of the protrusions on the bottom surface is 550 μm, the minimum diameter is 150 μm, the average diameter is about 150 to 500 μm, the height of the apex of the protrusions is about 30 to 100 μm, the pitch of the center points between adjacent protrusions is about 150 to 800 μm, and the shape, diameter, height of the apex of each protrusion, and pitch of the center points between adjacent protrusions may be the same or different, respectively.
According to the interlayer film for laminated glass of the present invention, if an interlayer film having rough surface and having a crack pattern on the surface thereof is used (the crack pattern is naturally generated without any embossing in the process of preparing the interlayer film), the pressed pattern does not damage the existing crack pattern, but a protrusion having a substantially circular shape is pressed on the original crack pattern, so that when the interlayer film is pre-press bonded to the glass, air between the interlayer film and the glass can be smoothly removed by the channels formed by the original crack pattern, and can be further removed by the channels of the randomly arranged press pattern, thereby increasing the degassing property of the interlayer film. In addition, because the embossing pattern is an irregular pattern, the exhaust channel formed by the irregular pattern has multi-directionality and can exhaust air from four sides, and the defect that the traditional intermediate film can exhaust air only from a fixed direction is overcome.
Furthermore, because the approximately circular bumps are formed on the intermediate film, the maximum diameter of the circle of the bumps on the bottom surface is 550 μm, the minimum diameter is 150 μm, the average diameter is between about 150 and 500 μm, the peak height of the bumps is between about 30 and 100 μm, the center point distance between every two adjacent bumps is about 150 to 800 μm, and the shape, the diameter, the peak height of each bump and the center point distance between every two adjacent bumps can be the same or different, irregular patterns are generated, and the generation of the ripple phenomenon can be avoided when the interlayer is laminated with the glass.
Therefore, the interlayer film for laminated glass provided by the invention not only has self-adhesion resistance in storage, but also improves degassing performance in a pre-bonding process for manufacturing laminated glass, thereby improving processing operability and effectively applying the interlayer film to various processing conditions.
Another aspect of the present invention provides a laminated glass having at least two sheets of glass, and an interlayer film for a laminated glass of the present invention sandwiched therebetween.
In a further aspect of the present invention, there is provided a method for preventing waviness of an intermediate film for a laminated glass having a rough surface and improving degassing properties of the intermediate film, comprising forming a plurality of irregular patterns of approximately circular protrusions on the intermediate film, wherein the maximum diameter of the circle of the bottom surface of the protrusions is 550 μm, the minimum diameter thereof is 150 μm, the average diameter thereof is about 150 to 500 μm, the height of the apex of the protrusions is about 30 to 100 μm, the distance between the center points of adjacent protrusions is about 150 to 800 μm, and the shape, diameter, height of the apex of each protrusion and the distance between the center points of adjacent protrusions may be the same or different.
Drawings
FIG. 1 is a photograph of the pattern of an embossing roll used in example 1 of the present invention.
FIG. 2 is a pattern drawing of an embossing roll used in comparative example 2 of the present invention.
FIG. 3 is a pattern diagram of an embossing roll used in comparative example 3 of the present invention.
FIG. 4 is an SEM photograph of an interlayer film in example 1 of the present invention.
FIG. 5 is an SEM photograph of an interlayer film in comparative example 1 of the present invention.
FIG. 6 is an SEM photograph of an interlayer film in comparative example 2 of the present invention.
FIG. 7 is an SEM photograph of an interlayer film in comparative example 3 of the present invention.
Detailed Description
The terms used in the present specification have their ordinary meanings in the technical field in general, in the context of the present invention and in the specification of the present invention, depending on the use of each term. Some terms are used to detail the present invention as will be discussed below. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. However, in case of conflict, the present specification, including definitions, will control.
The interlayer film for laminated glass of the present invention
The invention provides an intermediate film for laminated glass, which is formed by embossing two surfaces of a sheet made of thermoplastic resin, each surface is provided with a plurality of approximately circular raised irregular patterns, the maximum diameter of the circle of the bottom surface of each protrusion is 550 mu m, the minimum diameter is 150 mu m, the average diameter is between about 150 and 500 mu m, the peak height of each protrusion is between about 30 and 100 mu m, the center point distance between every two adjacent protrusions is between about 150 and 800 mu m, and the shape, the diameter, the peak height of each protrusion and the center point distance between every two adjacent protrusions can be the same or different.
The term "approximately circular protrusion" herein means a contour of the protrusion within this range as long as it does not have an acute angle, preferably approximately circular or elliptical protrusion; since the raised profiles of the present invention may be the same or different, they form a pattern of irregularities on the intermediate film.
Further, the term "circle of the bottom surface of the protrusion" herein means a profile of the bottom surface of the protrusion, which changes in level from the plane of the interlayer, and is a true circle or a non-true circle, while the approximately circular protrusion herein may be a true circle or a non-true circle, and thus the term "diameter" herein means a distance of the circle of the bottom surface of the approximately circular protrusion through the center thereof, which is called a maximum diameter when the distance is the maximum, and is called a minimum diameter when the distance is the minimum.
The "height of the apex of the protrusion" in the present invention means a distance between the apex of the approximately circular protrusion in a direction perpendicular to the intermediate film and the surface of the intermediate film. And the term "center point of the protrusion" refers to the geometric center point of the approximately circular protrusion projected on a plane.
The "average diameter" in the present invention means an average value of the maximum diameter and the minimum diameter of a circle of the bottom surfaces of all the protrusions on the intermediate film.
In a preferred embodiment of the present invention, the mean diameter of the circle of the bottom surface of the protrusion is in the range of about 150 to 500 μm, the height of the protrusion top is in the range of about 30 to 100 μm, and the center point spacing between each two adjacent protrusions is in the range of about 150 to 800 μm.
According to the invention, each side of the middle film is provided with a plurality of approximately circular bulges, the average diameter of the circle of the bottom surface of each bulge can be about 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm or 550 μm, preferably about 200 μm, 300 μm or 400 μm, and the average diameter of the circle of the bottom surface of each bulge can be the same or different; and each of the bump apex heights may be about 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, or 100 μm, and each of the bump apex heights may be the same or different; the pitch of the center points between adjacent protrusions may be between about 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 380 μm, 400 μm, 450 μm, 500 μm, 550 μm, 600 μm, 650 μm, 700 μm, 780 μm, or 800 μm, and the pitch of the center points between adjacent protrusions may be the same or different.
In a more preferred embodiment, the average diameter is about 340 μm, the height of the apex of the protrusions is about 70 μm, and the center-point spacing between adjacent protrusions is about 400 μm.
In the interlayer film for a laminated glass according to the present invention, the irregular pattern shape is formed by pressing the projections toward the portions of the interlayer film having no projections by heating or pressing in the pre-press bonding process during the processing of the laminated glass, and air can be pushed out from the portions having no projections by the pressing to sufficiently degas the laminated glass. However, the height of the peak of the bump is preferably about 30 to 100 μm, since the air trapped in the channel between the bump and the bump is not easily exhausted if the height of the peak of the bump is outside the range defined in the present invention. In addition, if the intermediate film originally has rough surface cracking lines, the embossing lines according to the invention do not damage the original cracking lines of the intermediate film, so that air between the intermediate film and the glass can be smoothly discharged from the embossing channels, and can be further discharged from the channels formed by the original cracking lines, thereby further increasing the degassing property of the intermediate film.
The term "thermoplastic resin sheet" as used herein refers to a known sheet that can be used for an intermediate film for a general laminated glass, and examples thereof include a plastic polyvinyl acetal resin sheet (e.g., polyvinyl butyral), a polyurethane resin sheet, an ethylene-vinyl acetate resin sheet, an ethylene-ethyl acrylate resin sheet, and a plastic polyvinyl chloride resin sheet. These thermoplastic resin sheets are excellent in basic performances required for an interlayer film for laminated glass, such as adhesion, weather resistance, penetration resistance, transparency, etc., and among them, a polyvinyl acetal resin sheet is preferable. In a preferred embodiment of the present invention, polyvinyl butyral is used. The preparation of the polyvinyl butyrals used in the preferred embodiment of the invention is carried out by condensation of polyvinyl alcohol having an average degree of polymerization of from about 800 to 3000, preferably from 1000 to 2500, with butyraldehyde in the presence of a catalyst, the resulting polyvinyl butyrals having a hydroxyl content of from 15 to 30% by weight, preferably from 15 to 25% by weight, most preferably from 19 to 24% by weight.
The polyvinyl butyral may be further added with a plasticizer used in a known technique, such as ethylene glycol di-2-ethylbutyrate, 1, 3-propanediol di-2-ethylbutyrate, 1, 4-butanediol di-2-ethylbutyrate, 1, 2-butanediol di-2-ethylbutyrate, diethylene glycol di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylvalerate, triethylene glycol di-2-ethylhexanoate, tetraethylene glycol di-2-ethylbutyrate, diethylene glycol didecanoate, triethylene glycol didecanoate, and the like.
The intermediate film of the present invention may contain other additives, if necessary, and the additives are not particularly limited as long as the properties of the intermediate film obtained are not adversely affected, and for example, the additives may be a heat stabilizer, an ultraviolet absorber such as benzotriazole series, an adhesion controller such as alkali metal or alkaline earth metal formate, an antioxidant, and the like.
The above additives (including plasticizer) are preferably added in an amount of 20 to 60 parts by weight, more preferably 30 to 40 parts by weight, based on 100 parts by weight of the polyvinyl butyral.
The thickness of the thermoplastic resin sheet is appropriately determined in consideration of the penetration resistance required for the laminated glass, but is not particularly limited, and an interlayer film commonly used in the known art is preferably used, and preferably 0.2 to 2 mm.
The laminated glass of the present invention
Another aspect of the present invention is to provide a laminated glass having at least two sheets of glass and an interlayer film for the laminated glass according to the present invention sandwiched therebetween.
The term "laminated glass" herein is not particularly limited as long as the interlayer film for laminated glass of the present invention is sandwiched between two glass plates, and is not limited to a three-layer structure composed of glass plate/interlayer film/glass plate, and may be a multi-layer structure composed of glass plate/interlayer film/glass plate, and the like.
The glass used in the present invention is not particularly limited, and examples thereof include inorganic glass, polycarbonate plate, and organic glass such as polymethyl methacrylate.
The method for producing the laminated glass of the present invention is not particularly limited, and a general method for producing a laminated glass may be used, and in brief, the interlayer film for a laminated glass of the present invention is sandwiched between at least two sheets of glass, and then preliminarily pressure-bonded to degas the interlayer film, and after the intermediate film is temporarily bonded, pressure-bonded in a hot press to obtain an integrated laminated glass.
The pre-press bonding is to clamp the intermediate film of the invention into a laminated body, and the laminated body passes through a press roll, and is subjected to pre-press bonding (extrusion degassing method) while degassing is performed under the conditions that the pressure is 2 to 1000kPa and the temperature is 50 to 150 ℃; or connecting the plastic bag containing the laminate to an exhaust system, and pre-pressing under vacuum suction of-40 to-75 kPa under reduced pressure and elevated temperature of 60 to 150 ℃ (reduced pressure degassing method).
The pre-pressed laminate can be subjected to final pressing by a conventional hot press or a pressing machine at a temperature of 110 to 160 ℃ and a pressure of 200 to 1500kPa to produce a laminated glass.
In the above-mentioned manufacturing method, the pressure and temperature conditions are known in the art and thus are not described in detail, but those skilled in the art can adjust the pressure and temperature conditions according to the characteristics of the intermediate film to achieve the best effect.
The present invention relates to a method for preventing the occurrence of waviness in an interlayer film for a laminated glass having a rough surface and improving the degassing property of the interlayer film
In another aspect of the present invention, there is provided a method for preventing waviness of an interlayer film for a laminated glass having a rough surface and improving outgassing of the interlayer film, comprising forming a plurality of approximately circular irregular patterns of protrusions on the interlayer film, wherein the maximum diameter of the circle of the bottom surface of the protrusions is 550 μm, the minimum diameter is 150 μm, the average diameter is in the range of about 150 to 500 μm, the height of the top point of the protrusions is in the range of about 30 to 100 μm, the distance between the center points of adjacent protrusions is about 150 to 800 μm, and the shape, diameter, height of the top point of each protrusion and the distance between the center points of adjacent protrusions may be the same or different from each other.
Because the intermediate film for the laminated glass with the rough surface is provided with a plurality of raised irregular patterns which are approximately round, the occurrence of the ripple phenomenon can be effectively inhibited; and the pattern pressing path does not damage the broken lines of the rough surface when the intermediate film has the rough surface with broken lines, so that air between the intermediate film and the glass can be smoothly discharged from the channels formed by the pattern pressing path and further discharged from the channels formed by the original broken lines, and the degassing property of the intermediate film is improved.
As a method for forming the above-mentioned emboss, an emboss roller method, a calender roller method, a profile extrusion (profile extrusion) method, etc. can be used, and among them, the emboss roller method is preferable. When the embossing roll method is used, the surface of the metal roll is subjected to sand blasting using an abrasive material such as alumina or silica, and then polished to form a desired embossing pattern on the surface of the roll (i.e., protrusions having an approximately circular shape complementary to the intermediate film of the present invention and having an average diameter of about 150 to 500 μm, a protrusion apex height of about 30 to 100 μm, a center-to-center distance between adjacent protrusions of about 150 to 800 μm, and a shape, a diameter, a protrusion apex height and a center-to-center distance between adjacent protrusions of the same or different irregular pattern indentation patterns). When the embossing roller is engaged in rolling mode, the area of the surface of the thermoplastic resin sheet is changed in a pressing mode, and therefore the irregular pattern protrusions are formed on the surface of the thermoplastic resin sheet. The embossing roll forming system may be located downstream of a die for forming a film of thermoplastic resin sheet such that the thermoplastic resin sheet formed by the die passes through a nip between two rolling rolls, one of which is an embossing roll having the embossing pattern on its surface, wherein the embossing pattern is complementary to the pattern to be formed on the intermediate layer and the other roll is a cooperating smooth-sided backing roll. After one side of the thermoplastic resin sheet is pressed by the embossing roller with the embossing pattern, the other side of the thermoplastic resin sheet is pressed in a reversed way.
Examples
The present invention will be specifically illustrated by the following examples, which should not be construed as unduly limiting the invention. Modifications and variations of the embodiments discussed herein can be made by one of ordinary skill in the art without departing from the spirit or scope of the invention, and yet still fall within the scope of the invention.
Preparation example 1 preparation of polyvinyl butyral interlayer
100 kg of polyvinyl butyral resin and 35 kg of ADK CIZER RS-107 plasticizer (available from Changjiang chemical Co., Ltd.) were fed into a high-intensity extruder mixer, the temperature was maintained in the range of 190 to 193 ℃ and after mixing the polyvinyl butyral resin with the plasticizer mixture for about 5 minutes, the extruded melt was forced to pass through a film-forming die to extrude a sheet of about 0.76 mm, and the sheet was cooled and wound to obtain a pattern-free polyvinyl butyral intermediate film having original surface patterns, which was measured for the depth of the surface patterns by a surface roughness analyzer (brand: Kosaka Laboratory Ltd., model: SURF CORDER SE1200) and had an average surface roughness of 34.7 μm.
Example 1 preparation of interlayer film A1 for laminated glass of the present invention
The polyvinyl butyral interlayer of production example 1 was cut into a square of 35cm × 35cm, and the polyvinyl butyral interlayer was heated to 65 to 75 ℃ in advance, and then, double-sided pressing was performed. The pressing conditions are that the temperature of the embossing roller is 130 ℃, and the pressure is 30kg/cm2The pattern on the embossing roller being complementary toThe intermediate film is desired to have approximately circular protrusions having a minimum diameter of 280 μm and a maximum diameter of 400 μm, and an average diameter of about 300 μm, a protrusion apex height of about 65 to 70 μm, and a center point pitch of each adjacent protrusion of about 380 to 400 μm, and the shape, diameter, protrusion apex height, and center point pitch of each adjacent protrusion may be the same or different in irregular pattern of depressions, and the pressing operation is completed by pressing with an embossing roller (as shown in fig. 1) that presses the intermediate film under the above conditions, to obtain an intermediate film a1 for laminated glass.
Example 2 preparation of interlayer film A2 for laminated glass of the present invention
Each condition was the same as that of production example 1, and only the emboss roller was replaced with emboss rollers having a pattern complementary to the approximately circular emboss to be provided in the intermediate film, the maximum diameter of which was 450 μm, the minimum diameter of which was 350 μm, and the average diameter size of which was about 400 μm, the apex height of the emboss was about 85 to 90 μm, the center-point pitch between adjacent embosses was about 780 to 800 μm, and the shape, diameter, apex height of each emboss and center-point pitch between adjacent embosses were the same or different, to press the emboss roller of the intermediate film under the above conditions, i.e., to complete the pressing operation, thereby obtaining an intermediate film A2 for laminated glass.
Example 3 preparation of interlayer film A3 for laminated glass of the present invention
Each condition was the same as that of production example 1, and only the emboss roller was replaced with a concave pattern having a pattern complementary to the approximately circular pattern to be provided on the intermediate film, a maximum diameter of 220 μm, a minimum diameter of 180 μm, an average diameter of about 200 μm, a peak height of the protrusions of about 35 to 45 μm, a center-to-center distance between adjacent protrusions of about 200 to 300 μm, and the shape, diameter, peak height of each protrusion and center-to-center distance between adjacent protrusions of the approximately circular pattern were the same or different, to press the intermediate film with the emboss roller having the above condition, thereby completing the pressing operation and obtaining an intermediate film A3 for laminated glass.
Comparative example 1 polyvinyl butyral interlayer film B1 not subjected to embossing
The polyvinyl butyral interlayer of production example 1 was cut into a square of 35cm × 35cm, and used as an interlayer film B1 for laminated glass without being subjected to an embossing process.
Comparative example 2 interlayer film B2 for laminated glass having concave line embossing
An interlayer film B2 for laminated glass was obtained by performing pressing operation under the same conditions as in example 1 except that the polyvinyl butyral interlayer film of production example 1 was used and the embossing roll was replaced with an embossing roll having a pattern of a plurality of parallel raised lines, the angle of the apex of the raised lines was 90 degrees, the height of the apex from the roll surface was 100 μm, the width was 200 μm, and the distance between the apexes of adjacent raised lines was 600 μm (as shown in fig. 2). The interlayer film B2 had parallel embossed lines, and when the appearance and light transmittance tests were performed after sandwiching glass between subsequent interlayer films, the laminated glass was processed under conditions in which the processing direction was parallel to the line embossed lines of the interlayer film.
Comparative example 3 interlayer film B3 for laminated glass having concave line embossing
The polyvinyl butyral interlayer of production example 1 was used in the same manner as in example 1, except that the pressing conditions were an embossing roll temperature of 100 ℃ and a pressure of 10kg/cm2And the embossing roll was replaced with an embossing roll having an embossed pattern of a plurality of parallel embossed lines, the embossed lines were pressed at an apex angle of 30 degrees, a height of 280 μm from the roll surface, a width of 150 μm, and a distance of 600 μm from the center point of the adjacent embossment (as shown in FIG. 3), and an interlayer film B3 for laminated glass was obtained. The interlayer film B3 had parallel embossed lines, and when the appearance and light transmittance tests were performed after sandwiching glass between subsequent interlayer films, the laminated glass was processed under conditions in which the processing direction was parallel to the line embossed lines of the interlayer film.
Comparative example 4 intermediate film B4 for producing laminated glass having irregular Pattern
Each condition was the same as example 1 except that the emboss roller was replaced with an emboss roller pattern having a pattern complementary to that of the intermediate film to have approximately circular protrusions having a maximum diameter of 110 μm and a minimum diameter of 90 μm and an average diameter of about 100 μm, a protrusion apex height of about 15 to 25 μm, a center point pitch between adjacent protrusions of about 90 to 100 μm, and the shape, diameter, protrusion apex height and center point pitch between adjacent protrusions of the approximately circular protrusions may be the same or different irregular pattern, to thereby obtain an intermediate film B4 for laminated glass by embossing the intermediate film under the above conditions, i.e., to complete the embossing operation. This intermediate film B4 was irregular in the same manner as the present invention, but the size of each projection was outside the scope of the present invention.
Comparative example 5 intermediate film B5 for producing laminated glass having irregular Pattern
Each condition was the same as example 1 except that the emboss roller was replaced with a concave pattern having a pattern complementary to the approximately circular pattern to be provided on the intermediate film, the maximum diameter of the concave pattern was 650 μm, the minimum diameter of the concave pattern was 550 μm, the average diameter was 600 μm, the peak height of the convex pattern was about 110 to 120 μm, the center-point pitch between adjacent convex patterns was about 1100 to 1200 μm, and the shape, diameter, peak height of each convex pattern and center-point pitch between adjacent convex patterns were the same or different, to thereby obtain an intermediate film B5 for laminated glass by embossing roller pressing the intermediate film under the above conditions. This intermediate film B5 was irregular in the same manner as the present invention, but the size of each projection was outside the scope of the present invention.
Comparative example 6 interlayer film B2 for laminated glass having concave line embossing
Each condition was the same as in comparative example 2, that is, the interlayer film for a laminated glass having concave line embossings obtained in comparative example 2 was used, but only when the appearance and light transmittance test was carried out after sandwiching glass between subsequent interlayer films, the laminated glass processing condition was changed so that the processing direction was perpendicular to the line emboss pattern of the interlayer film.
Comparative example 7 interlayer film B3 for laminated glass having concave line embossing
Each condition was the same as in comparative example 3, that is, the interlayer film for a laminated glass having concave line embossings obtained in comparative example 3 was used, but only when the appearance and light transmittance test was carried out after sandwiching glass between subsequent interlayer films, the laminated glass processing condition was changed so that the processing direction was perpendicular to the line emboss pattern of the interlayer film.
Only the laminated glass processing conditions were replaced with those in which the processing direction was perpendicular to the line-embossed pattern.
In the above examples and comparative examples, the physical and chemical properties and the gas release properties of the intermediate films of the examples and comparative examples of the present invention were measured by the following methods.
A. Appearance: cutting a 30cm square polyvinyl butyral intermediate film, enabling the embossed polyvinyl butyral intermediate film to be sandwiched in two pieces of automobile front windshield bent glass (purchased from forest and commercial industry reinforced safety glass, ltd., product model 2.355W front windshield glass), sealing the sandwich glass by using a vacuum strip, exhausting air, maintaining the vacuum degree below 0torr, simultaneously placing the sandwich glass in an oven, maintaining the temperature at 130 ℃ for 1.5 hours, taking out the sandwich glass, cooling to room temperature, observing the pressing state of the embossed polyvinyl butyral intermediate film and the automobile front windshield bent glass, and keeping original grains to represent that the pressing state is poor; if no original texture remains, the pressing state is good.
B. Light transmittance (gas emission property): after the laminated glass was treated in the same manner as in the above-mentioned step A, the transmittance of the laminated glass was measured with a spectrophotometer (trademark: Perkin Elmer, model: Lambda 40), and 100% transmittance was defined as no sample was placed, air was directly corrected, and after the transmittance of the air value was taken as 100%, the transmittance was classified into 9 grades, and the measured transmittance was 90 to 99% as grade 9, and the transmittance was 80 to 89% as grade 8, and so on, 0to 19% as grade 1, in other words, 1 was the worst transmittance, and 9 was the best transmittance, which was taken as the basis for judging the exhaust gas property.
C. Electron Microscope (SEM) analysis: taking the polyvinyl butyral intermediate film which finishes the pressing operation, and analyzing and observing the surface pattern pressing path and the original pattern through a high-magnification SEM (magnification factor of 50).
The interlayer films for laminated glasses obtained in examples 1 to 3 and comparative examples 1 to 7 were subjected to appearance, light transmittance and SEM analysis, and the results are shown in table 1 below.
TABLE 1
As can be seen from table 1 above, the raised embossed patterns of examples 1,2 and 3 are randomly arranged, and have the advantage of multi-directional four-sided air venting. Although the exhaust state is also good in comparative examples 2 and 3, the line embossed pattern of comparative examples 2 and 3 is one-sided fixed direction both sides exhaust, as can be seen from table 1 above, compared to comparative examples 6 and 7 using an intermediate film of the line embossed pattern of comparative examples 2 and 3, it is found that comparative example 6 and 7 have poor exhaust effect because the processing direction is perpendicular to the line embossed pattern, and therefore, during processing, the processing direction of the laminated glass must be in the same direction as the line embossed pattern of the intermediate film to allow smooth exhaust, but the processing direction is restricted, and furthermore, the regular lines thereof generate a ripple phenomenon, which makes processing difficult for the processor; therefore, the raised embossing pattern of the invention not only can reduce the processing direction error caused by mechanical or human factors, but also can overcome the problem of yield reduction; in addition, the embossing pattern of the intermediate film is randomly raised, so that the corrugation phenomenon cannot be caused; in the pre-pressing process of processing the laminated glass, under the heating or pressurizing, the convex part of the intermediate film is dispersed to the concave part, and the dispersion can fully degas the laminated glass by air pressure; as can be seen from the above table 1, the size of the protrusions, the height of each protrusion and the distance between the center points are controlled so that the air can be completely pressed out by the collapse of the protrusions during the pre-compression.
In summary, the interlayer film for laminated glass according to the present invention has approximately circular protrusions on both sides, and the protrusions have irregular sizes and form irregular patterns, so that the interlayer film does not have the moire phenomenon, has good workability in cutting or interlayer processing, and has excellent degassing performance in the pre-press bonding process.
Further, the present invention has the above-described configuration, and therefore provides an interlayer film for laminated glass which does not require strict control of the degassing start temperature in the pre-press bonding process, does not cause the phenomenon of preliminary sealing of the outer periphery, and exhibits excellent degassing properties.
Further, since the interlayer film of the present invention has the above-described structure, even when a laminated glass having a large area or a laminated glass having a large curvature is manufactured or when productivity of the laminated glass is improved, the obtained laminated glass can be sufficiently sealed with respect to degassing and the glass plate and the interlayer film, and when the laminated glass is subjected to heat and pressure in a hot press to be finally bonded, quality defects such as bubbles generated between the glass plate and the interlayer film due to intrusion of pressurized air from a defective sealing portion are improved, and the laminated glass is particularly excellent in transparency.
Therefore, the interlayer film for laminated glass according to the present invention can perform degassing and sealing well in a wide temperature range in the pre-press bonding process, and has advantages that the pre-press bonding temperature can be easily managed, and the workability of interlayer processing is significantly improved. Therefore, the interlayer film for laminated glass according to the present invention can be easily and efficiently applied to window glass of automobiles, aircrafts, buildings, and the like, because it is excellent in workability in interlayer production and can provide high-quality laminated glass free from quality defects due to the generation of bubbles even under severe conditions.
Claims (7)
1. An interlayer film for laminated glass, characterized in that: the intermediate film is formed by embossing on both sides of a sheet formed by thermoplastic resin added with plasticizer, each side has a plurality of approximately circular raised irregular patterns and the embossing arrangement mode of each side is the same, wherein the maximum diameter of the circle of the bottom surface of the raised part is 550 μm, the minimum diameter is 150 μm, the average diameter is 150 to 500 μm, the peak height of the raised part is 30 to 100 μm, the center point distance between adjacent raised parts is 150 to 800 μm, the shape, the diameter, the peak height of each raised part and the center point distance between adjacent raised parts are not completely the same, and the part is the same.
2. The interlayer film for laminated glass according to claim 1, wherein: the average diameter is 320-400 μm, the height of the top of the protrusions is 70-90 μm, and the center point distance between every two adjacent protrusions is 380-420 μm.
3. The interlayer film for laminated glass according to claim 2, wherein: the average diameter is 340 μm, the height of the top of the protrusions is 70 μm, and the center point distance between adjacent protrusions is 400 μm.
4. The interlayer film for laminated glass according to any one of claims 1 to 3, wherein: the thickness of the thermoplastic resin sheet is 0.2-2 mm.
5. The interlayer film for laminated glass according to any one of claims 1 to 3, wherein: the thermoplastic resin sheet is made of polyvinyl butyral.
6. A laminated glass having at least two sheets of glass and an interlayer film for a laminated glass according to claim 1 sandwiched therebetween.
7. A method for preventing the occurrence of waviness in an interlayer film for a laminated glass having a rough surface and improving the degassing property of the interlayer film, characterized in that: comprising using the interlayer film for laminated glass according to any one of claims 1 to 5.
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| CN201710915748.8A CN107619202B (en) | 2012-06-13 | 2012-06-13 | Interlayer film for laminated glass and laminated glass comprising same |
| CN201210193490.2A CN103482887A (en) | 2012-06-13 | 2012-06-13 | Interlayer film for laminated glass and laminated glass containing same |
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| CN109968887B (en) * | 2019-04-23 | 2024-05-24 | 佛山市高明区捷丰裕金属制品有限公司 | Novel panel embossing machine |
| CN110054422A (en) * | 2019-05-16 | 2019-07-26 | 天津南玻节能玻璃有限公司 | Air guide agent, preparation method and its exhaust liquid method |
| CN110027293B (en) * | 2019-05-16 | 2022-01-25 | 天津南玻节能玻璃有限公司 | Air-guiding agent, preparation method and liquid exhaust method thereof |
| US11426981B2 (en) * | 2019-11-29 | 2022-08-30 | Chang Chun Petrochemical Co., Ltd. | Polymer film and uses of the same |
| CN112876794B (en) * | 2019-11-29 | 2023-02-28 | 长春石油化学股份有限公司 | Polymer film and use thereof |
| CN111251694B (en) * | 2020-03-11 | 2022-01-21 | 江苏铁锚玻璃股份有限公司 | Preparation method of interlayer film and preparation method of electric heating glass |
| TWI778833B (en) * | 2021-10-18 | 2022-09-21 | 長春石油化學股份有限公司 | Polymer film and uses of the same |
| CN113880403B (en) * | 2021-10-26 | 2023-06-30 | 常州亚玛顿股份有限公司 | Embossing device for improving embossing roller concave grain calendering depth and embossed glass calendering method |
| CN116277825A (en) * | 2023-03-14 | 2023-06-23 | 中山博锐斯新材料股份有限公司 | Production method of TPU film for exhaust type laminated glass |
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