CN113400744B

CN113400744B - Laminated glass and method for producing laminated glass

Info

Publication number: CN113400744B
Application number: CN202110569835.9A
Authority: CN
Inventors: 宋国山; 周耀; 池科长; 陈碧珠
Original assignee: Fuyao Glass Industry Group Co Ltd
Current assignee: Fuyao Glass Industry Group Co Ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2022-11-11
Anticipated expiration: 2041-05-25
Also published as: CN113400744A

Abstract

The laminated glass comprises outer glass, a bonding layer and inner glass which are arranged in a laminated mode, wherein the bonding layer is arranged between the outer glass and the inner glass and comprises at least one modified EVA layer, and the modified EVA is an ethylene-vinyl acetate copolymer added with modified resin. According to the laminated glass provided by the invention, the bonding layer is arranged between the outer glass and the inner glass and comprises at least one modified EVA layer, and the modified EVA is the ethylene-vinyl acetate copolymer added with the modified resin, so that the bonding force between the bonding layer and the outer glass and between the bonding layer and the inner glass is improved, and the structural stability of the laminated glass is further effectively improved.

Description

Laminated glass and method for producing laminated glass

Technical Field

The invention belongs to the technical field of vehicle glass, and particularly relates to laminated glass and a manufacturing method of the laminated glass.

Background

Currently, laminated glass is widely used in various vehicles because of its superior performance compared to single-layer glass. A conventional laminated glass is composed of inner glass, outer glass, and an organic interlayer film sandwiched between the inner and outer glasses. However, in general, the material of the organic interlayer is polyvinyl butyral (PVB), and since the PVB material is a non-crosslinked material and has a low softening temperature, the PVB material may be softened or even melted when heated, and the strength, mechanical properties, and adhesion of the PVB material are greatly reduced, so that the structural stability of the laminated glass is low.

Disclosure of Invention

The invention aims to provide laminated glass and a manufacturing method of the laminated glass, which can effectively improve the adhesive force between an adhesive layer and inner and outer glass so as to ensure that the laminated glass has higher structural stability.

In order to realize the purpose of the invention, the invention provides the following technical scheme:

in a first aspect, the invention provides laminated glass, which comprises outer glass, a bonding layer and inner glass which are arranged in a laminated manner, wherein the bonding layer is arranged between the outer glass and the inner glass, the bonding layer comprises at least one modified EVA layer, and the modified EVA is an ethylene-vinyl acetate copolymer added with modified resin.

According to the laminated glass provided by the invention, the bonding layer is arranged between the outer glass and the inner glass and comprises at least one modified EVA layer, and the modified EVA is an ethylene-vinyl acetate copolymer added with modified resin, so that the bonding force between the bonding layer and the outer glass and the inner glass is improved, and the structural stability of the laminated glass is further effectively improved.

In one embodiment, the adhesive layer comprises two modified EVA layers, one of the modified EVA layers is connected to the outer glass, the other modified EVA layer is connected to the inner glass, and the adhesive layer further comprises a functional layer disposed between the two modified EVA layers. Under the structure, the existence of the two modified EVA layers can effectively realize the fixed connection between the structures of all layers in the laminated glass, thereby effectively improving the structural stability of the laminated glass. In addition, the existence of the functional layer can enable the laminated glass to have different functional characteristics so as to meet the corresponding use requirements. Simultaneously, compare with traditional standard PVB, the bonding effect of modified EVA layer and functional layer is better, and the marginal water blocking capacity of the laminated glass who forms is better moreover, and laminated glass's inside can not produce the bubble problem yet.

In one embodiment, the functional layer is a light modulation layer, and the material of the light modulation layer is selected from at least one of a polymer dispersed liquid crystal element, an electrochromic element, and a suspended particle device element. The polymer dispersed liquid crystal element is characterized in that liquid crystal is dispersed in an organic solid polymer matrix in micro-scale small droplets, the optical axis of the small droplets formed by liquid crystal molecules is in free orientation, the refractive index of the small droplets is not matched with that of the matrix, and when light passes through the matrix, the small droplets are strongly scattered by the liquid crystal molecules to form an opaque milky white state or a semitransparent state. Application of an electric field can adjust the optical axis orientation of the liquid crystal droplets, which when refractive indices match, appear transparent. The electric field is removed and the liquid crystal droplets restore the original state of astigmatism, thereby performing display. Based on this, the light modulation layer made of the polymer dispersed liquid crystal element can effectively realize the controllable adjustment of the light transmission performance. It should be noted that the dimming layer made of the electrochromic element or the suspended particle device element also has a corresponding dimming function, and details are not described here.

In one embodiment, the functional layer is a thermal insulation layer, the material of the thermal insulation layer comprises polyethylene terephthalate, and at least one surface of the thermal insulation layer facing the modified EVA layer is further provided with at least one of an electrical heating coating, a thermal insulation coating, a coloring coating and an antireflection coating. Under the structure, the heat insulation layer can effectively realize the heat insulation function, so that the temperature difference of two sides of the laminated glass can be effectively controlled. The polyethylene terephthalate has excellent physical and mechanical properties in a wide temperature range, and can effectively block infrared rays and ultraviolet rays, so that a heat insulation layer made of the polyethylene terephthalate can have a corresponding heat insulation function. It can be understood that the laminated glass can have corresponding functions by coating the surface of the heat insulation layer with coatings with different functions.

In one embodiment, the functional layer is a PVB layer having a wedge structure. With the above structure, the functional layer is made of Polyvinyl Butyral (PVB) material. Moreover, because the PVB layer is of a wedge-shaped structure, perspective double images or reflection double images of Head Up Display (HUD) images can be effectively eliminated, so that the visual performance of the laminated glass is improved, and the laminated glass can effectively realize the head up display function.

In one embodiment, the functional layer is a PVB layer with added plasticizers. Under the structure, the functional layer is prepared by adding the plasticizer into the PVB, so that the functional layer has a better sound insulation function, and the sound insulation effect of the laminated glass is further improved.

In one embodiment, the functional layer is a PVB layer to which an infrared absorber and/or an ultraviolet absorber is added. Under the structure, the functional layer is made by adding the infrared absorbent and/or the ultraviolet absorbent into the PVB, so that the functional layer has the functions of heat insulation and/or ultraviolet isolation, and the laminated glass has the corresponding functions.

In one embodiment, the modified resin includes a crosslinking agent by which an ethylene-vinyl acetate copolymer having a linear structure is crosslinked to form the modified EVA having a network structure. The modified EVA layer with obviously improved strength performance, high temperature creep resistance, water resistance, sound insulation and the like is obtained by combining the crosslinking agent and the ethylene-vinyl acetate copolymer, so that the modified EVA layer can completely meet various safety performance requirements of the laminated glass.

In one embodiment, the modified resin comprises one or more of a polymerization inhibitor, an antioxidant, a light stabilizer and a silane coupling agent. The polymerization inhibitor can slow down the cross-linking reaction time in the bonding layer, and is favorable for improving the air extraction effect of the laminated glass in the vacuumizing stage; the antioxidant is beneficial to improving the oxidation resistance of the bonding layer; the light stabilizer is beneficial to improving the ultraviolet resistance of the bonding layer so as to delay aging; the silane coupling agent improves the adhesion between the adhesive layer and the glass. It is understood that when the modified resin further comprises one or more of a polymerization inhibitor, an antioxidant, a light stabilizer and a silane coupling agent, the bonding layer can have corresponding functional characteristics, so that the performance of the laminated glass is further optimized.

In one embodiment, the content of vinyl acetate in the modified EVA layer ranges from 5% to 40%. When the content of vinyl acetate in the modified EVA layer is less than 5%, the crosslinking reaction in the modified EVA layer is incomplete, so that the bonding force between the bonding layer and the inner and outer glass is weak; when the vinyl acetate content in the modified EVA layer is greater than 40%, the crosslinking reaction in the modified EVA layer is excessive, which also results in poor adhesion between the adhesive layer and the inner and outer glasses. Based on this, when the content of vinyl acetate in the modified EVA layer is more than or equal to 5% and less than or equal to 40%, the crosslinking reaction in the modified EVA layer is favorable to optimizing, thereby improving the adhesive force between the adhesive layer and the inner and outer glass, enabling the laminated glass to have higher structural stability, and preventing the problem that bubbles are generated inside the laminated glass.

In one embodiment, a weight of 200 g is hung under the modified EVA layer with the thickness of 1.52mm, the width of 30mm and the length of 150mm, and the modified EVA layer is placed in an oven at 70 ℃ and has the creep elongation of less than or equal to 5% after 10 minutes. It will be appreciated that the modified EVA layer performs better than the standard PVB layer in terms of resistance to thermal creep.

In one embodiment, the creep elongation of the modified EVA layer is less than or equal to 2%. It will be appreciated that when the creep elongation of the modified EVA layer is within the above numerical range, the laminated glass including the modified EVA layer has a higher structural stability.

In one embodiment, the modified EVA layer has a water absorption of less than or equal to 0.5% after being left in an environment with a temperature of 23 ℃ and a relative humidity of 50% for 24 hours. It will be appreciated that the modified EVA layer has a low water absorption relative to a standard PVB layer, thereby improving the edge water blocking capability of the laminated glass, requiring no edge sealing and being less prone to delamination.

In one embodiment, the modified EVA layer has a water absorption of less than or equal to 0.2%. It is understood that when the water absorption of the modified EVA layer is within the above numerical range, the laminated glass including the modified EVA layer can be used in a humid environment without edge sealing treatment, and does not cause delamination problems due to water absorption.

In one embodiment, the laminated glass has an average transmission loss of at least 42dB over a range of 1600 to 3250 Hz. It can be understood that, in the common noise range, namely, in the range of 1600-3250Hz, the average value of the Sound Transmission Loss (STL) of the laminated glass provided by the application reaches at least 42dB, so that the laminated glass has a better Sound insulation effect to effectively realize the Sound insulation function.

In one embodiment, the outer glass is a bent glass sheet having a thickness of 1.6mm to 3.5mm and the inner glass is a bent glass sheet having a thickness of 0.7mm to 2.1 mm. When the outer glass and the inner glass are of the structures, the laminated glass formed by combining the outer glass, the bonding layer and the inner glass can effectively meet the use requirements of vehicles.

In a second aspect, the present invention provides a method for manufacturing a laminated glass, the method comprising: providing an outer glass and an inner glass; arranging a bonding layer between the outer glass and the inner glass, and carrying out laminating treatment, wherein the bonding layer comprises at least one modified EVA layer, and the modified EVA is an ethylene-vinyl acetate copolymer added with modified resin; and carrying out primary pressing treatment on the outer glass, the bonding layer and the inner glass which are arranged in a laminated manner.

In one embodiment, the temperature range for the preliminary pressure treatment is 70 to 115 ℃.

In one embodiment, after the outer glass, the adhesive layer, and the inner glass stacked in layers are subjected to preliminary press treatment, the outer glass, the adhesive layer, and the inner glass stacked in layers are subjected to high-pressure treatment.

In one embodiment, the temperature range during the high pressure treatment is 125 ℃ to 135 ℃.

By the method for manufacturing the laminated glass, the laminated glass provided by the invention can be manufactured, and the laminated glass can meet the requirement of low cost and has higher structural stability.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural view of a laminated glass provided by an embodiment of the present invention;

FIG. 2 is a schematic structural view of a laminated glass of another embodiment;

FIG. 3 is a schematic structural view of a laminated glass of another embodiment;

FIG. 4 is a schematic structural view of a laminated glass of another embodiment;

FIG. 5 is a schematic structural view of a laminated glass according to another embodiment;

FIG. 6 is a schematic structural view of a laminated glass according to another embodiment;

FIG. 7 is a schematic structural view of a laminated glass of another embodiment;

fig. 8 is a schematic flow chart of a method for manufacturing a laminated glass according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, belong to the protection scope of the present invention.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring first to fig. 1, an embodiment of the present invention provides a laminated glass 100, where the laminated glass 100 includes an outer glass 10, an adhesive layer 20 and an inner glass 30, the adhesive layer 20 is disposed between the outer glass 10 and the inner glass 30 to connect the outer glass 10 and the inner glass 30, and the adhesive layer 20 includes at least one modified EVA layer 21, where the modified EVA is an ethylene-vinyl acetate copolymer (EVA) added with a modified resin.

The outer glass 10 and the inner glass 30 are made of a light-transmitting material, so as to achieve the functions of light transmission and protection. The outer glass 10 and the inner glass 30 may be selected from flat glass or curved glass, and the structure of the outer glass 10 and the inner glass 30 is not particularly limited. It is understood that the sizes of the outer glass 10 and the inner glass 30 are matched to make the edges of the formed laminated glass 100 flat so as to meet the corresponding use requirements. In one specific embodiment, the outer glass is a bent glass sheet of 1.6mm to 3.5mm thickness and the inner glass is a bent glass sheet of 0.7mm to 2.1mm thickness.

Wherein, the bonding layer 20 is disposed between the outer glass 10 and the inner glass 30 to connect the outer glass 10 and the inner glass 30 to form an integral structure, thereby forming the laminated glass 100. In this embodiment, the adhesive layer 20 includes at least one modified EVA layer 21, and fig. 1 shows a case where the adhesive layer 20 includes one modified EVA layer 21. It is understood that in the conventional laminated glass, the structure between the outer glass 10 and the inner glass 30 is usually made of polyvinyl butyral (PVB) material, however, the PVB material is non-crosslinked and has a low softening temperature, and after being heated, the adhesion between the PVB material and the glass is greatly reduced, thereby resulting in poor stability of the conventional laminated glass. In this embodiment, the modified EVA is a cross-linked material, and the connection stability between the modified EVA layer 21 and the glass is relatively high, so that a relatively high adhesion force is formed between the adhesive layer 20 and the glass, and the adhesion force between the adhesive layer 20 and the outer glass 10 and the inner glass 30 can be effectively prevented from being greatly reduced due to temperature rise, thereby effectively improving the structural stability of the laminated glass 100.

Wherein, the modified EVA is prepared by adding modified resin into ethylene-vinyl acetate copolymer. It is to be understood that the kind of the modified resin may be various so long as the corresponding modification function can be achieved, and the kind of the modified resin is not specifically limited herein. In one embodiment, the modified resin comprises a cross-linking agent, and the ethylene-vinyl acetate copolymer with a linear structure is cross-linked by the cross-linking agent to form the modified EVA with a net structure, so that the strength, high-temperature creep resistance, water resistance, sound insulation and the like of the modified EVA are obviously improved, and the modified EVA can completely meet various safety performance requirements of the laminated glass for vehicles.

In one embodiment, the modified resin further comprises one or more of a polymerization inhibitor, an antioxidant, a light stabilizer and a silane coupling agent. The polymerization inhibitor can slow down the crosslinking reaction time in the modified EVA, and is beneficial to improving the air extraction effect of the laminated glass in the vacuumizing stage; the antioxidant is beneficial to improving the oxidation resistance of the modified EVA; the light stabilizer is beneficial to improving the ultraviolet resistance of the modified EVA so as to delay aging; the silane coupling agent improves the binding force between the modified EVA and the glass. It is understood that when the modified resin further comprises one or more of a polymerization inhibitor, an antioxidant, a light stabilizer and a silane coupling agent, the modified EVA layer 21 can have corresponding functional characteristics, so that the overall performance of the laminated glass 100 can be further optimized.

The crosslinking reaction in the modified EVA layer 21 is affected by the content of vinyl acetate. In one embodiment, the amount of vinyl acetate in the modified EVA layer 21 ranges from 5% to 40%. It is understood that when the content of vinyl acetate in the modified EVA layer 21 is less than 5%, the crosslinking reaction within the modified EVA layer 21 is incomplete, resulting in weak adhesive force between the adhesive layer 20 and the outer and

inner glasses

10 and 30; when the content of the vinyl acetate in the modified EVA layer 21 is greater than 40%, the crosslinking reaction in the modified EVA layer 21 is excessive, which also results in weak adhesion between the adhesive layer 20 and the outer and

inner glasses

10 and 30. Based on this, when the content of vinyl acetate in the modified EVA layer 21 is greater than or equal to 5% and less than or equal to 40%, it is favorable to optimizing the crosslinking reaction degree in the modified EVA layer 21, thereby improving the adhesive force between the adhesive layer 20 and the outer glass 10 and the inner glass 30, making the laminated glass 100 have higher structural stability, and preventing the bubble generation problem inside the laminated glass 100.

According to the laminated glass 100 provided by the embodiment of the invention, the bonding layer 20 is arranged between the outer glass 10 and the inner glass 30, the bonding layer 20 comprises at least one modified EVA layer 21, and the modified EVA is an ethylene-vinyl acetate copolymer added with modified resin, so that the bonding force between the bonding layer and the outer glass 10 and the inner glass 30 is improved, and the structural stability of the laminated glass 100 is effectively improved.

It can be understood that through a series of performance tests, the modified EVA layer 21 has various performance advantages compared with a standard PVB layer, so that the laminated glass 100 provided by the embodiment of the present invention also has a strong edge water blocking capability, and does not generate the phenomena of debonding, delamination, and regeneration of bubbles, and compared with the conventional laminated glass, the laminated glass 100 provided by the embodiment of the present invention has a good sound insulation performance and structural stability.

In one example, a weight of 200 g is hung under the modified EVA layer 21 having a thickness of 1.52mm, a width of 30mm and a length of 150mm, and the modified EVA layer 21 is placed in an oven at 70 ℃ and has a creep elongation of 5% or less after 10 minutes. It will be appreciated that the modified EVA layer 21 has better thermal creep resistance than the standard PVB layer.

In one embodiment, the modified EVA layer 21 has a creep elongation of less than or equal to 2%. It is understood that when the creep elongation of the modified EVA layer 21 is within the above numerical range, the laminated glass 100 including the modified EVA layer 21 has high structural stability.

In one embodiment, the water absorption of the modified EVA layer 21 is less than or equal to 0.5% after the modified EVA layer 21 is left in an environment with a temperature of 23 ℃ and a relative humidity of 50% for 24 hours. It will be appreciated that the modified EVA layer 21 has a low water absorption relative to a standard PVB layer, thereby improving the edge water blocking capability of the laminated glass 100, requiring no edge sealing, and being less prone to delamination.

In one embodiment, the water absorption of the modified EVA layer 21 is less than or equal to 0.2%. It is understood that when the water absorption of the modified EVA layer 21 is within the above numerical range, the laminated glass 100 including the modified EVA layer 21 can be used in a humid environment without edge sealing treatment, and does not cause delamination problems due to water absorption.

In one embodiment, the laminated glass 100 has an average transmission loss of at least 42dB in the 1600-3250Hz range. It can be understood that, in the common noise range, i.e. in the range of 1600-3250Hz, the average value of Sound Transmission Loss (STL) of the laminated glass 100 provided by the present application is at least 42dB, so that the laminated glass 100 has a better Sound insulation effect to effectively realize the Sound insulation function.

Referring to table 1, table 1 compares the performance test results of the modified EVA and the standard PVB.

Creep elongation: preparing a modified EVA sample piece and a standard PVB sample piece with the thickness of 1.52mm, the width of 30mm and the length of 150mm, respectively hanging a weight of 200 g below the sample pieces, simultaneously placing the sample pieces in a 70 ℃ oven, measuring the heated lengths of L2 and L3 after 10 minutes, and calculating the creep elongation of the modified EVA sample piece and the standard PVB sample piece according to the (L2-150)/150 and the (L2-150)/150;

water absorption: preparing a modified EVA sample and a standard PVB sample with the same specification, placing the samples for 24 hours in an environment with the temperature of 23 ℃ and the relative humidity of 50%, and measuring and calculating the water absorption rate by using a spectrophotometer;

average transmission loss: preparing a modified EVA interlayer sample piece and a standard PVB interlayer sample piece, and measuring the average sound transmission loss STL in the range of 1600-3250Hz according to the standard ISO 16940;

modified EVA intermediate layer sample: 3.0mm of outer glass/0.76 mm of modified EVA layer/3.0 mm of inner glass;

standard PVB interlayer sample: 3.0mm outer glass/0.76 mm standard PVB ply/3.0 mm inner glass.

TABLE 1 comparison of Performance test results for modified EVA and Standard PVB

Performance of	Modified EVA	Standard PVB
			Creep elongation	1.3％	137％
Water absorption rate	0.12％	0.89％
			Average sound transmission loss of laminated glass in 1600-3250Hz range	43dB	37dB

As can be seen from table 1, the performances of the modified EVA and the standard PVB are tested under the same performance test conditions, and the comparison according to the results shows that the creep elongation and the water absorption of the modified EVA are both smaller than those of the standard PVB, so that the laminated glass 100 provided by the embodiment of the present invention has stronger structural stability and edge water blocking capability, and does not generate the phenomena of debonding, delamination and bubble regeneration, compared with the conventional laminated glass. In addition, within the range of 1600-3250Hz, the average sound transmission loss of the laminated glass 100 provided by the embodiment of the invention is greater than that of the traditional laminated glass, so that the laminated glass 100 provided by the embodiment of the invention has a better sound insulation effect, and the corresponding sound insulation function is effectively realized.

Referring to fig. 2, in an embodiment, the adhesive layer 20 includes two modified EVA layers 21, one of the modified EVA layers 21 is connected to the outer glass 10, and the other modified EVA layer 21 is connected to the inner glass 30, and the adhesive layer 20 further includes a functional layer 22, and the functional layer 22 is disposed between the two modified EVA layers 21. Because the functional layer 22 is weaker in bonding force with the outer glass 10 and the inner glass 30, the modified EVA layers 21 are respectively arranged on the two sides of the functional layer 22, so that the fixed connection among the structures of the layers in the laminated glass 100 can be effectively realized, and the structural stability of the laminated glass 100 is improved. In addition, the existence of the functional layer 22 can enable the laminated glass 100 to have different functional characteristics so as to meet the corresponding use requirements. Meanwhile, compared with the traditional standard PVB, the bonding effect of the modified EVA layer 21 and the functional layer 22 is better, the edge water-blocking capability of the formed laminated glass 100 is better, and the problem of bubbles in the laminated glass 100 is solved.

Referring to fig. 3, in an embodiment, the functional layer 22 is a light modulation layer 221, and the material of the light modulation layer 221 is selected from at least one of a polymer dispersed liquid crystal device, an electrochromic device, or a suspended particle device. The light adjusting layer 221 is used to control how much light passes through to achieve controllable adjustment of the light transmission properties of the laminated glass 100. The polymer dispersed liquid crystal is prepared by dispersing liquid crystal in a micro-meter small droplet in an organic solid polymer matrix, wherein the optical axis of the small droplet formed by liquid crystal molecules is in free orientation, the refractive index of the small droplet is not matched with that of the matrix, and when light passes through the matrix, the small droplet is scattered strongly to form an opaque milky white state or a semitransparent state. Application of an electric field can adjust the optical axis orientation of the liquid crystal droplets, which when refractive indices match, appear transparent. The electric field is removed and the liquid crystal droplets restore the original state of astigmatism, thereby performing display. Based on this, the light adjusting layer 221 made of polymer dispersed liquid crystal can effectively realize controllable adjustment of light transmission performance. It should be noted that the dimming layer made of the electrochromic element or the suspended particle device element also has a corresponding dimming function, and details are not described herein.

Referring to fig. 4, in an embodiment, the functional layer 22 is a thermal insulation layer 222, and a material of the thermal insulation layer 222 includes polyethylene terephthalate. It will be appreciated that the presence of the thermal insulation layer 222 effectively provides thermal insulation and thus effective control of the temperature differential across the laminated glass 100. The material of the thermal insulation layer 222 may be various, as long as the thermal insulation layer can satisfy the corresponding thermal insulation function, and the material of the thermal insulation layer 222 is not specifically limited herein. In a specific embodiment, the material of the thermal insulation layer 222 includes polyethylene terephthalate (PET). The polyethylene terephthalate has excellent physical and mechanical properties in a wide temperature range, and can effectively block infrared rays and ultraviolet rays, so that the heat insulation layer 222 made of the polyethylene terephthalate can have a corresponding heat insulation function, and the laminated glass 100 has excellent physical and mechanical properties and heat insulation performance.

In one embodiment, at least one surface of the thermal insulation layer 222 facing the modified EVA layer is further provided with at least one of an electrical heating coating (not shown), a thermal insulation coating (not shown), a colored coating (not shown), and an antireflection coating (not shown). It is understood that the laminated glass 100 can be provided with corresponding functions by coating the surface of the thermal insulation layer 222 with coatings with different functions. For example, an electrical heating coating is provided on the surface of the thermal insulation layer 222, that is, the temperature of the laminated glass 100 can be adjusted by current control to meet the corresponding use requirement; illustratively, the surface of the thermal insulation layer 222 is provided with a thermal insulation coating, and the presence of the thermal insulation coating can further improve the thermal insulation performance of the laminated glass 100; illustratively, the surface of the thermal insulation layer 222 is provided with a colored coating, the presence of which can change the color of the laminated glass 100 to beautify the laminated glass 100; illustratively, the surface of the thermal insulation layer 222 is provided with an anti-reflection coating, and the presence of the anti-reflection coating can reduce the reflection effect of the laminated glass 100 to avoid light pollution. It should be noted that the surface of the thermal insulation layer 222 may be coated with multiple coatings at the same time, so that the laminated glass 100 has multiple functions at the same time. It should be noted that the surface of the thermal insulation layer 222 may also be provided with other various coatings, including but not limited to the above, and the type of coating is not specifically limited herein.

Referring to fig. 5, in one embodiment, the functional layer 22 is a PVB layer 223 having a wedge-shaped structure. With the above structure, the functional layer 22 is made of Polyvinyl Butyral (PVB) material.

It can be understood that due to the specific structure of the PVB layer 223 having the wedge-shaped structure, a perspective ghost or a reflection ghost of a Head Up Display (HUD) image can be effectively eliminated to improve the visual performance of the laminated glass 100, so that the laminated glass 100 can effectively implement a head up display function. Also, the range of the wedge angle θ of the PVB ply 223 having a wedge structure should be suitably large so as to be effectively applicable to a plurality of kinds of vehicles when the laminated glass 100 is used as a window of a vehicle. In a particular embodiment, the angle θ of the wedge of PVB layer 223 having a wedge-shaped structure can range from 0.01mard to 0.5mard. Within the range of the wedge angle θ described above, the laminated glass 100 in the present embodiment can be applied to various vehicles such as passenger cars, sports cars, racing cars, and the like.

Referring to fig. 6, in one embodiment, the functional layer 22 is a PVB layer 224 with a plasticizer added. It can be understood that the functional layer 22 is made by adding a plasticizer to the PVB, so that the functional layer 22 has a better sound insulation function, thereby further improving the sound insulation effect of the laminated glass 100. In this embodiment, the PVB layer 224 added with a plasticizer includes a first layer 2241, a second layer 2242 and a third layer 2243 which are stacked, the second layer 2242 is disposed between the first layer 2241 and the third layer 2243, wherein the first layer 2241 and the third layer 2243 are made of PVB but do not include a plasticizer, and the second layer 2242 is made of PVB added with a plasticizer. It can be understood that second layer 2242 is made through the PVB that adds the plasticizer, can further improve the syllable-dividing effect of second layer 2242, however, its and modified EVA layer 21 between the cohesive force can descend by a wide margin, consequently, set up first layer 2241 and third layer 2243 respectively in the both sides of second layer 2242, can effectively realize the fixed connection between each layer structure in laminated glass 100, thereby when further improving laminated glass 100's syllable-dividing effect, laminated glass 100's structural stability has been guaranteed.

In one embodiment, the hardness of the second layer 2242 is less than the hardness of the modified EVA layer 21. It can be understood that when the hardness of second layer 2242 is less, when the sound wave is propagating to second layer 2242, second layer 2242 can take place slight elastic deformation under the influence of sound wave to play certain cushioning effect to the sound wave, thereby effectively improve syllable-dividing effect. And when the hardness of the second layer 2242 is less than that of the modified EVA layer 21, the sound insulation effect of the second layer 2242 can satisfy the corresponding use requirements.

Referring to fig. 7, in one embodiment, the functional layer 22 can also be a PVB layer 225 added with an infrared absorber and/or an ultraviolet absorber. Accordingly, the PVB layer 225 added with the infrared and/or ultraviolet absorbers includes a fourth layer 2251, a fifth layer 2252, and a sixth layer 2253, and the fifth layer 2252 is disposed between the fourth layer 2251 and the sixth layer 2253, wherein the fifth layer 2251 and the sixth layer 2253 are made of PVB, but do not include the infrared and ultraviolet absorbers, and the fifth layer 2252 is made of PVB added with the infrared and/or ultraviolet absorbers. With the above structure, the functional layer 22 has a function of insulating heat and/or ultraviolet rays, and the laminated glass 100 has a corresponding function.

Referring to fig. 8, an embodiment of the present invention provides a method for manufacturing a laminated glass, including the following steps:

s1, providing outer glass and inner glass.

And S2, arranging a bonding layer between the outer glass and the inner glass, and carrying out laminating treatment, wherein the bonding layer comprises at least one modified EVA layer, and the modified EVA is an ethylene-vinyl acetate copolymer added with modified resin.

And S3, carrying out primary pressing treatment on the outer glass, the bonding layer and the inner glass which are arranged in a laminated mode.

The laminated glass provided by the invention can be manufactured by the manufacturing method of the laminated glass provided by the invention, and the laminated glass can meet the low-cost requirement and has higher structural stability.

In one embodiment, the temperature range during the preliminary pressing is 70 ℃ to 115 ℃. It should be noted that, when the temperature for performing the preliminary pressing treatment is too low, the crosslinking reaction in the modified EVA layer does not occur, so that the adhesive property between the adhesive layer and the outer glass and the inner glass is not good, which may result in an increase in the defective rate of the laminated glass; when the temperature of carrying out the primary pressure processing was too high, modified EVA layer spilled glue easily, influenced the primary pressure treatment effect, when the defective rate that leads to laminated glass increased, still further increased the cost of manufacture. Based on this, the temperature during the initial pressing treatment should be in the range of 70 ℃ to 115 ℃ so as to effectively reduce the fraction defective of the laminated glass and reduce the manufacturing cost to a certain extent. It should be noted that, because the material of the bonding layer includes the ethylene-vinyl acetate copolymer added with the modified resin, in the manufacturing method provided in this embodiment, the modified EVA layer generates a certain degree of crosslinking reaction during the preliminary pressing treatment, and the laminated glass after the preliminary pressing treatment can be directly used as the laminated glass for a vehicle without high pressure treatment.

According to the automobile glass production needs, laminated glass still need carry out initial pressure processing and high-pressure treatment after closing the piece and handling, and initial pressure is handled and is gone on at the initial pressure production line usually, and high-pressure treatment goes on usually in the autoclave, and the traditional laminated glass who adopts standard PVB still must be through high-pressure treatment after handling through initial pressure and just can regard as automobile laminated glass to use, and the laminated glass who adopts the modified EVA layer in this application can not need further high-pressure treatment in some embodiments to the cost of manufacture has effectively been reduced.

In one embodiment, after step S3, the following steps are further performed:

and S4, carrying out high-pressure treatment on the outer glass, the bonding layer and the inner glass which are arranged in a laminated manner. It will be appreciated that for certain applications, high pressure processing is required to produce laminated glass meeting higher requirements.

In one embodiment, the temperature range during the high pressure treatment is 125 ℃ to 135 ℃. When the temperature for the high-pressure treatment is too low or too high, the yield of the laminated glass is also increased. Based on this, the temperature during the high pressure treatment should be in the range of 125 ℃ to 135 ℃ to effectively reduce the fraction defective of the laminated glass. In addition, because the material of the bonding layer comprises the ethylene-vinyl acetate copolymer added with the modified resin, the modified EVA layer generates a higher degree of crosslinking reaction, and the laminated glass with higher structural stability is obtained.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The laminated glass is characterized by comprising outer glass, a bonding layer and inner glass which are arranged in a laminated mode, wherein the bonding layer is arranged between the outer glass and the inner glass and comprises at least one modified EVA layer, and the modified EVA is an ethylene-vinyl acetate copolymer added with modified resin; wherein the content range of the vinyl acetate in the modified EVA layer is 5-40%; the modified resin comprises a cross-linking agent, and the ethylene-vinyl acetate copolymer with a linear structure is cross-linked by the cross-linking agent to form the modified EVA with a net structure; and after the modified EVA layer is placed in an environment with the temperature of 23 ℃ and the relative humidity of 50% for 24 hours, the water absorption rate of the modified EVA layer is less than or equal to 0.5%.

2. The laminated glass according to claim 1, wherein said adhesive layer comprises two of said modified EVA layers, one of said modified EVA layers being attached to said outer glass and the other of said modified EVA layers being attached to said inner glass, said adhesive layer further comprising a functional layer disposed between said two modified EVA layers.

3. The laminated glass according to claim 2, wherein the functional layer is a light modulation layer, and a material of the light modulation layer is selected from at least one of a polymer dispersed liquid crystal element, an electrochromic element, and a suspended particle device element.

4. The laminated glass according to claim 2, wherein the functional layer is a thermal insulation layer made of polyethylene terephthalate, and at least one surface of the thermal insulation layer facing the modified EVA layer is further provided with at least one of an electric heating coating, a thermal insulation coating, a coloring coating and an antireflection coating.

5. The laminated glass according to claim 2, wherein the functional layer is a PVB layer having a wedge structure.

6. The laminated glass according to claim 2, wherein the functional layer is a PVB layer added with a plasticizer.

7. The laminated glass according to claim 2, wherein the functional layer is a PVB layer to which an infrared absorber and/or an ultraviolet absorber is added.

8. The laminated glass according to any one of claims 1 to 7, wherein the modified resin further comprises one or more of a polymerization inhibitor, an antioxidant, a light stabilizer, and a silane coupling agent.

9. The laminated glass according to claim 1, wherein a weight of 200 g is hung below the modified EVA layer with the thickness of 1.52mm, the width of 30mm and the length of 150mm, and the modified EVA layer is placed in an oven at 70 ℃ and has the creep elongation of less than or equal to 5% after 10 minutes.

10. The laminated glass according to claim 9, wherein the creep elongation of the modified EVA layer is less than or equal to 2%.

11. The laminated glass according to claim 1, wherein the water absorption of the modified EVA layer is less than or equal to 0.2%.

12. The laminated glass according to claim 1, wherein the laminated glass has an average transmission loss of at least 42dB over a range of 1600Hz to 3250 Hz.

13. The laminated glass according to claim 1, wherein the outer glass is a bent glass sheet of 1.6mm to 3.5mm thickness and the inner glass is a bent glass sheet of 0.7mm to 2.1mm thickness.

14. A method for manufacturing laminated glass is characterized by comprising the following steps:

providing an outer glass and an inner glass;

arranging a bonding layer between the outer glass and the inner glass, and carrying out laminating treatment, wherein the bonding layer comprises at least one modified EVA layer, the modified EVA is an ethylene-vinyl acetate copolymer added with modified resin, the content range of vinyl acetate in the modified EVA layer is 5% -40%, the modified resin comprises a cross-linking agent, the ethylene-vinyl acetate copolymer with a linear structure is cross-linked by the cross-linking agent to form the modified EVA with a net structure, and the water absorption of the modified EVA layer is less than or equal to 0.5% after the modified EVA layer is placed in an environment with the temperature of 23 ℃ and the relative humidity of 50% for 24 hours;

and carrying out primary pressing treatment on the outer glass, the bonding layer and the inner glass which are arranged in a laminated manner.

15. The method of claim 14, wherein the temperature range during the preliminary pressing is 70 ℃ to 115 ℃.

16. The manufacturing method according to claim 14, wherein after the outer glass, the adhesive layer, and the inner glass stacked in layers are subjected to preliminary press processing, the outer glass, the adhesive layer, and the inner glass stacked in layers are subjected to high-pressure processing.

17. The method of claim 16, wherein the temperature range for the high-pressure treatment is 125 ℃ to 135 ℃.