KR102169978B1 - Film for laminating glasses and transparent laminated body - Google Patents

Abstract

The glass bonding film of the present invention and the light-transmitting laminate comprising the same are a sound insulation core layer containing a polyvinyl acetal resin and a plasticizer for a core, and a function to maintain sound insulation performance by being located on one or both sides of the sound insulation core layer. And a core portion including a holding layer, and has a more improved sound insulation property.

Description

Glass bonding film and light-transmitting laminate comprising the same {FILM FOR LAMINATING GLASSES AND TRANSPARENT LAMINATED BODY}

The present invention relates to a glass bonding film and a light-transmitting laminate comprising the same.

Plasticized polyvinyl acetal is used in the manufacture of films applied as intermediate layers in light-transmitting laminates, such as laminated glass (tempered glass, safety glass) and polymer laminate.

Laminated glass refers to a transparent laminate manufactured by placing a polyvinyl butyral sheet between two sheets of glass. Laminated glass is mainly used to provide transparent barriers in building railings, exterior materials, and automobile windshields.

The main function of laminated glass is to minimize damage or injury to objects or persons within the transparent barrier by absorbing the energy caused by hitting, while not allowing penetration through the laminated glass (impact resistance). . In addition, the interlayer sheet applied to the laminated glass may impart additional functionality to the laminated glass, such as weakening acoustic noise and reducing UV and/or IR light transmission.

In particular, there is a great demand for improved sound insulation properties for films used for glass such as automobiles and buildings. The sound insulation property can be evaluated by the amount of transmission loss according to the change in frequency. In particular, the range of 1,000 to 6,000 Hz, which belongs to the range of the loudness curve, has a high sensitivity in the human hearing, so it is a range above the sound insulation performance in other areas. The sound insulation performance is important.

Laminated glass using a conventional interlayer film has sufficient anti-scattering effect, but it is difficult to have sufficient sound insulation performance because it cannot sufficiently reduce the coincidence effect, which is a resonance effect caused by the glass plate around 2,000 Hz.

For example, Japanese Patent No. 3,335,436 discloses a laminated glass that has an interlayer interposed between a pair of glass plates and exhibits shatterproof performance and sound insulation performance. However, since the interlayer interposed between the laminated glass is specialized in sound insulation performance only at room temperature, the effect of the sound insulation performance is limited in the actual field (FIELD) where temperature changes occur in the morning/evening or by season.

Japanese Patent No. 3,224,436 Domestic registered patent No. 10-1354439

It is an object of the present invention to provide a glass bonding film having excellent sound insulation properties and a light-transmitting laminate comprising the same.

In order to achieve the above object, an aspect of the present invention is a sound insulation core layer containing a polyvinyl acetal resin and a plasticizer for a core, and a functional retention layer positioned on one or both sides of the sound insulation core layer to maintain sound insulation performance. Including a core portion comprising a; and, the functional retention layer provides a film for glass bonding containing a polyester resin.

The glass bonding film may take within 48 hours from the time of glass bonding to reaching the maximum sound insulation properties.

It may include; a skin layer positioned on one or both sides of the core part.

The function retention layer may be a stretched polyester film.

The sound insulation core layer may include 32 to 45% by weight of the plasticizer based on the total sound insulation core layer.

Another aspect of the present invention is a core portion including a sound insulation core layer containing a polyvinyl acetal resin and a plasticizer for a core, and a functional retention layer positioned on one or both surfaces of the sound insulation core layer to maintain sound insulation performance; It includes, and provides a film for glass bonding, in which the deviation between the minimum value of sound insulation properties and the maximum value of sound insulation properties measured within 30 days after glass bonding is within 0.018.

The glass bonding film may have a loss factor of 0.21 or more measured at 10°C.

The glass bonding film may have a loss coefficient of 0.19 or more measured at 30°C.

The glass bonding film may have a loss factor of 0.34 or more measured at 20°C.

The function holding layer may include a polyester layer containing a polyethylene terephthalate resin.

The function holding layer may be made of a polyester layer containing a polyethylene terephthalate resin.

The glass bonding film may have a loss factor of 0.25 or more measured at 15° C., and a loss factor of 0.26 or more measured at 25° C.

Another aspect of the present invention includes a laminate comprising two sheets of light-transmitter, and a glass bonding film positioned between the two sheets of light-transmitter.

The film for glass bonding of the present invention and the light-transmitting laminate including the same maintain a constant sound insulation property of the core portion immediately after bonding to the glass, and can stably have excellent sound insulation properties not only at 20°C, but also at 10°C and 30°C.

1 is a conceptual diagram illustrating a light-transmitting laminate according to an embodiment of the present invention.
Figure 2 is a graph showing the change in the loss coefficient measured value over time after glass bonding of Examples and Comparative Examples prepared in the examples of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. The same reference numerals are assigned to similar parts throughout the specification.

Throughout this specification, the term "combination of these" included in the expression of the Makushi form means one or more mixtures or combinations selected from the group consisting of the constituent elements described in the expression of the Makushi form, and the constituent elements It means to include one or more selected from the group consisting of.

Throughout this specification, terms such as “first”, “second” or “A” and “B” are used to distinguish the same terms from each other. In addition, expressions in the singular include plural expressions unless the context clearly indicates otherwise.

In the present specification, the “~” system may mean including a compound corresponding to “~” or a derivative of “~” in the compound.

In the present specification, the meaning that B is located on A means that B is located directly on A or B is located on A while another layer is located between them, and B is located so as to contact the surface of A. It is limited to that and is not interpreted.

In the present specification, the singular expression is interpreted as meaning including the singular or plural, interpreted in context, unless otherwise specified.

In the present specification, the amount of hydroxyl groups was evaluated by measuring the amount of ethylene groups to which the hydroxyl groups of the polyvinyl acetal resin are bound in a method in accordance with JIS K6728.

Although the existing sound insulation film for glass bonding exhibits a certain degree of sound insulation properties, it is often specialized only at room temperature, and there is a continuing demand for a glass bonding film that provides a certain level of sound insulation properties even at low and high temperatures. In addition, the existing sound insulation film has a characteristic that the plasticizer moves in the process of bonding with glass or the like in a high temperature and high pressure environment, and thus, shows sound insulation properties only after a relatively long stabilization time has elapsed. The inventors of the present invention confirmed that this problem can be solved by applying a function retaining layer, which is a heterogeneous film together with a sound insulating core layer of the core part, while continuing research on a film that solves this problem, and completed the present invention.

1 is a conceptual diagram illustrating a light-transmitting laminate according to an embodiment of the present invention. The present invention will be described in more detail below with reference to FIG. 1.

In order to achieve the above object, the film 10 for glass bonding according to an embodiment of the present invention includes a sound insulation core layer 35 containing a polyvinyl acetal resin and a plasticizer for a core, and the sound insulation core layer 35 It includes; a core portion 30 including a function retaining layer (33, 34) positioned on one side or both sides to maintain sound insulation performance.

The core part 30 may include a first function retaining layer 33 positioned on one surface of the sound insulating core layer 35.

The core part 30 includes a first function retaining layer 33 disposed on one surface of the sound insulating core layer 35 and a second function retaining layer 34 disposed on the other surface of the sound insulating core layer 35 May include;

The function retention layers 33 and 34 serve to prevent the movement of plasticizers generated by heat or pressure. At this time, the movement of the plasticizer refers to interlayer movement of the plasticizer in the glass bonding film, such as movement between the sound insulation core layer 35 and the skin layers 21 and 22 described later.

The function holding layers 33 and 34 may contain a polyester resin.

The function retention layers 33 and 34 may include a polyester film.

The polyester film may be a stretched polyester film.

The function holding layers 33 and 34 may specifically be a polyester layer containing a polyethylene terephthalate resin.

The function holding layers 33 and 34 may have a thickness of 1 to 10% based on the entire core part 30. The thickness of the function holding layer means the sum of the thicknesses of the first function holding layer 33 and the second function holding layer 34.

The function holding layers 33 and 34 having such a very thin thickness can substantially prevent the movement of the plasticizer with a thin thickness, so that the overall thickness of the glass bonding film 10 is not increased, and the core portion ( The sound insulation properties of 30) are stably maintained, so that it can have excellent sound insulation properties.

The glass bonding film 10 may further include skin layers 21 and 22 positioned on one or both sides of the core part 30.

The glass bonding film 10 includes a first skin layer 21 located on one surface of the core part 30 and a second skin layer 22 located on the other surface of the core part 30 can do.

Specifically, the glass bonding film 10 includes a first skin layer 21-a first function retaining layer 33-a sound insulation core layer 35-a second function retaining layer 34-a second skin layer ( It may have a five-layer structure of 22).

The skin layers 21 and 22 and the sound insulation core layer 35 may contain a polyvinyl acetal resin and a plasticizer applied to a glass bonding film.

The function holding layers 33 and 34 may be formed of a different film other than a polyvinyl acetal resin, and specifically, a layer containing a polyester resin described above may be applied.

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

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

Among the polyvinyl acetal resins, polyvinyl acetal resins for cores are used as polyvinyl acetal resins applied to the sound insulating core layer 35. In addition, among the polyvinyl acetal resins, polyvinyl acetal resin for skin is used as a polyvinyl acetal resin applied to the skin layers 21 and 22.

The polyvinyl acetal resin for the core may be a polyvinyl acetal resin having a hydroxyl amount of 9.5 wt% or less, a polyvinyl acetal resin having 0.1 to 9.5 wt%, and a polyvinyl acetal resin having 1 to 9 wt% .

The polyvinyl acetal resin for the core may contain 3 to 15% by weight of an acetyl group.

The polyvinyl acetal resin for the core may contain an acetal group in a residual amount excluding the hydroxyl group and an acetyl group.

The polyvinyl acetal resin for skin may be a polyvinyl acetal resin having a hydroxyl amount of 18.9% by weight or more, and may be a polyvinyl acetal resin having 18.9 to 30% by weight.

The polyvinyl acetal resin for skin may contain 0.1 to 3% by weight of an acetyl group.

The polyvinyl acetal resin for skin may contain an acetal group in a residual amount excluding the hydroxyl group and an acetyl group.

The skin layers 21 and 22 and/or the sound insulation core layer 35 contain a plasticizer together with the polyvinyl acetal resin.

The plasticizer is triethylene glycol bis 2-ethylhexanoate (3G8), tetraethylene glycol diheptanoate (4G7), triethylene glycol bis 2-ethylbutyrate (3GH), triethylene glycol bis 2-heptanoate (3G7). ), dibutoxyethoxyethyl adipate (DBEA), butyl carbitol adipate (DBEEA), dibutyl sebacate (DBS), bis 2-hexyl adipate (DHA), and mixtures thereof. And, more specifically, triethylene glycol bis 2-ethylhexanoate (3G8) may be applied as the plasticizer.

The skin layers 21 and 22 may contain the plasticizer in an amount of 24 to 34% by weight, and may contain 24 to 30% by weight based on the entire skin layer.

The sound insulating core layer 35 may contain the plasticizer in an amount of 32 to 45% by weight, based on the total amount of the sound insulating core layer, and may contain 37 to 44% by weight. In addition, the sound insulation core layer 35 may contain the plasticizer in an amount of 39 to 43% by weight, 40 to 42% by weight, and 40.5 to 41.5% by weight based on the total amount of the plasticizer. can do.

The content of the plasticizer in the sound insulation core layer 35 is quite large, and even if such a relatively large amount of plasticizer is applied to the sound insulation core layer 35, it is possible to maintain excellent physical properties as a whole of the glass bonding film. It is believed that this is because the plasticizer does not migrate to the skin layer and does not reduce mechanical properties and the like as a whole. In addition, even if a relatively large amount of plasticizer is applied, it is considered to exhibit excellent sound insulation properties overall over a wide temperature range due to stable film properties.

The skin layers 21 and 22 and/or the sound insulation core layer 35 may further include an additive together with the polyvinyl acetal resin and a plasticizer.

The additive includes a metal salt compound.

The metal salt compound is applied to obtain a bonding force control effect, specifically, a metal salt of a carboxylic acid having 2 to 16 carbon atoms may be applied, and more specifically, a metal salt of a divalent metal having 2 to 12 carbon atoms, or 1 having 2 to 6 carbon atoms Metal salts of metals can be applied.

The metal ions included in the metal salt compound may be any one selected from the group consisting of sodium monovalent cation, magnesium divalent cation, and potassium monovalent cation.

The metal salt compound may be applied to the composition as it is, or dissolved in a solvent and ionized, and serves as a bonding force modifier.

Specifically, the adhesion between the film and the glass surface can be adjusted. When the metal salt compound is applied to the composition in a solution state, dispersion and movement of ions derived from the metal salt compound or the metal salt compound may be more easily performed in the prepared film or bonding layer.

The metal salt compound may be included in an amount of less than 1.0% by weight, less than 0.5% by weight, and less than 0.35% by weight based on the total amount of the molten resin. In addition, the metal salt compound may be included in an amount of 0.01 to 0.5% by weight, 0.01 to 0.35% by weight, 0.01 to 0.25% by weight, and 0.01 to 0.2% by weight based on the total molten resin. I can.

The metal salt compound may be preferably applied to the skin layers 21 and 22.

Each of the layers may further contain an additive selected from the group consisting of antioxidants, heat stabilizers, UV absorbers, UV stabilizers, IR absorbers, glass adhesion modifiers, and combinations thereof, respectively, as needed.

The antioxidant may be a hindered amine type or a hindered phenol type. Specifically, when a process temperature of 150° C. or higher is applied, it is more preferable to apply a hindered phenolic antioxidant. As the hindered phenolic antioxidant, for example, BASF's IRGANOX 1076, 1010, or the like can be used.

The thermal stabilizer may be a phosphite-based thermal stabilizer in consideration of compatibility with an antioxidant. For example, IRGAFOS 168 from BASF can be used.

As the UV absorber, Chemisorb 12, Chemisolve 79, Chemisolve 74, Chemisolve 102, BASF's Tinuvin 328, Tinuvin 329, Tinuvin 326, etc. may be used as the UV absorber. The UV stabilizer may be used, such as BASF's Tinuvin. ITO, ATO, AZO, etc. may be used as the IR absorber, and metal salts such as Mg, K, Na, etc., epoxy-based modified Si oil, or a mixture thereof may be used as the glass bonding agent, but the present invention is limited thereto. It does not become.

The glass bonding film 10 may have a thickness of 1,300 um or less, 600 to 1,100 um or less, and 650 to 900 um. The glass bonding film 10 has excellent mechanical properties such as impact resistance and penetration resistance at a relatively thin thickness, and may exhibit excellent sound insulation properties.

The thickness of the sound insulation core layer 35 may be 30 to 250 um, 70 to 200 um, and 100 to 180 um. When the sound insulating core layer 35 is formed with such a thickness, excellent sound insulating properties may be exhibited as a whole.

A film having a thickness of 1 to 500 um may be applied as the function retaining layers 33 and 34, a film of 1 to 100 um may be applied, and a film of 1 to 50 um may be applied.

A film of 1 to 20 um may be applied to the function holding layers 33 and 34, a film of 1 to 10 um may be applied, and a film of 1 to 5 um may be applied. In this case, it has the advantage of not substantially increasing the overall thickness of the film while maintaining or improving the sound insulation properties with a thinner thickness.

The glass bonding film 10 may take within 48 hours from the time of glass bonding to reaching the maximum sound insulation properties, and within 24 hours.

In general, in bonding the glass bonding film 10 with the light transmitting bodies 1 and 2 such as plate glass, pre-bonding and main bonding processes performed at a high temperature are performed. Exemplarily, the bonding process of the glass bonding film, which is a polyvinyl acetal film, and the light-transmitter, pre-bonding under reduced pressure at a temperature of about 80 to 140°C, pressurizing at a temperature of 120 to 150°C, and performing main bonding The process proceeds. This is a process for bonding by suppressing the formation of bubbles that may occur between the film and the glass (light transmitting body) during the film bonding process, fluidizing the surface of the polyvinyl butyral resin and eliminating the surface pattern.

In the case of the sound insulation film, it has a layered structure of skin layer-core layer-skin layer, and when the sound insulation film is pressed at high temperature between the light transmitting bodies in the above bonding process, interlayer movement of the plasticizer occurs, and the interlayer movement of the plasticizer The light-transmitting laminate 100 exhibits the intended sound insulation properties only after a stabilization period after bonding the silver glass. Typically, this stabilization period takes about 7 to 14 days.

In the present invention, the function retaining layers 33 and 34 are applied to the core part 30 together with the sound insulating core layer 35, thereby substantially preventing interlayer movement of the plasticizer during the glass bonding process. When applying the core portion 30 having these characteristics to the glass bonding film 10, it exhibits excellent sound insulation properties immediately after bonding, and has the advantage that a stabilization period after glass bonding is unnecessary. In addition, the content of the plasticizer may be stably maintained in the sound insulating core layer 35, may have excellent sound insulating properties over a relatively wide temperature range, and may have quite excellent sound insulating properties at room temperature.

In the present specification, the sound insulation characteristics are based on measurements measured by a loss factor, and the sound insulation characteristics described without special mention means sound insulation characteristics at 20°C.

The glass bonding film 10 may have a difference between a minimum value and a maximum value of sound insulation properties measured within 30 days after glass bonding within 0.018, within 0.015, and within 0.010. This characteristic means that there is practically no change in sound insulation properties within 30 days immediately after glass bonding, which may mean that it has stable sound insulation properties. In this case, the measurement of sound insulation characteristics is based on the measurement at daily intervals.

The glass bonding film 10 may have a loss factor of 0.21 or more, 0.22 or more, and 0.23 to 0.30, measured at 10°C. The film having such a loss factor value has excellent low-temperature sound insulation properties.

The glass bonding film 10 may have a loss factor of 0.34 or more, 0.36 or more, and 0.36 to 0.45, measured at 20°C. In addition, the glass bonding film 10 may have a loss factor value of 0.38 or more, measured at 20° C., and may be 0.40 or more. The film having such a loss factor value has excellent sound insulation properties at room temperature.

The glass bonding film 10 may have a loss factor of 0.19 or more, 0.20 or more, and 0.20 to 0.30, measured at 30°C. In addition, the glass bonding film 10 may have a loss factor value of 0.21 or more measured at 30°C. The film having such a loss factor value has excellent high-temperature sound insulation properties.

The glass bonding film 10 may have a loss factor of 0.25 or more, 0.30 or more, 0.31 or more, and 0.32 or more, measured at 15°C.

The glass bonding film 10 may have a loss coefficient of 0.26 or more, 0.30 or more, 0.31 or more, and 0.32 or more, measured at 25°C.

The glass bonding film 10 having these characteristics has excellent sound insulation properties in a relatively wide temperature range. Here, the measurement of the loss factor was evaluated based on that the thickness of the entire film was measured at a thickness of around 850 um.

A light-transmitting laminate according to another embodiment of the present invention includes two light-transmitters (1, 2), and a glass bonding film 10 as described above positioned between the two light-transmitters. Includes a sieve.

A transparent substrate may be applied to the light transmitting bodies 1 and 2, and for example, glass, plastic, or the like may be applied.

The light-transmitting laminate 100 may be used as a safety glass, such as a windshield of a vehicle or a building interior and exterior material. Since the detailed description of the glass bonding film 10 included in the light-transmitting laminate 100 is duplicated with that described above, the description thereof will be omitted.

Hereinafter, the present invention will be described in more detail through specific examples. The following examples are only examples to aid understanding of the present invention, and the scope of the present invention is not limited thereto.

1. Preparation of ingredients

1) Preparation of polyvinyl butyral resin (1)

Polyvinyl acetal resin with a degree of polymerization of 1700 and a degree of saponification of 99 mol% and n-butanal are added to the reactor, and the synthesis process of a conventional polyvinyl butyral resin is carried out to proceed with the amount of hydroxyl group 20.6 wt%, the degree of acetalization 78.2 wt%, and the amount of acetyl groups. A 1.2 wt% polyvinyl butyral resin was obtained.

2) Preparation of polyvinyl butyral resin (2)

Polyvinyl acetal resin with a degree of polymerization of 2400 and a degree of saponification of 92 mol% and n-butanal are added to the reactor, and the synthesis process of a conventional polyvinyl butyral resin is carried out to proceed with the amount of hydroxyl group 8.8 wt%, the degree of acetalization 82.2 wt%, and the amount of acetyl groups. A 9.0 wt% polyvinyl butyral resin was obtained.

3) PET film which is a heterogeneous film

A stretched PET film (manufactured by SKC, SC75, thickness 2.7 um) containing a polyester terephthalate resin was prepared.

2. Manufacture of glass bonding film

1) Preparation of the film of Examples 1 to 3

The film of Example 1 was prepared by applying the content of the plasticizer (3G8, hereinafter the same) and the resin shown in Table 1 below. Specifically, the extruded first skin layer (350 um), the sound insulation core layer (130 um), and the second skin layer (350 um) are laminated with the PET film as the first and second functional retention layers, respectively. Thus, the glass bonding film of Example 1 (about 835.4 um) was prepared.

Also in the case of Example 2 and Example 3, the application amount of the plasticizer was varied while applying the same other conditions such as the thickness of each layer, and the glass bonding films of Example 2 and Example 3 were prepared in the amounts shown in Table 1 below. I did.

2) Comparative Example Film Preparation

By applying the content of the plasticizer and the resin shown in Table 1 below, a three-layered film (a total of 800 um thickness of 340-120-340) was prepared by co-extrusion, and the following physical properties were tested with the comparative example film. The PET film as a functional retention layer was not applied to the film of the comparative example.

Skin layer resin Skin layer plasticizer content (% by weight) Sound insulation core layer resin Sound insulation core layer plasticizer
Content (% by weight) Functional layer Example 1 Susie (1) 27 Susie (2) 41 apply Example 2 Susie (1) 27 Susie (2) 40 apply Example 3 Susie (1) 27 Susie (2) 42 apply Comparative example Susie (1) 27 Susie (2) 37 Unapplied

3. Evaluation of sound insulation performance of glass bonding film

Each of the films of Example and Comparative Example was cut into a size of 30 cm in length and 2.5 cm in width, and sandwiched between two transparent float glasses of 30 cm in length, 2.5 cm in width, and 2.1 T (mm, hereinafter the same) in thickness. A light-transmitting laminate was obtained. This laminate was put in a rubber bag and degassed at a vacuum degree of 2.6 KPa for 20 minutes, then transferred into an oven while degassed, and further held at 90 DEG C for 30 minutes, and the laminate was pre-pressed by a vacuum press. The laminated body preliminarily pressed under conditions of a temperature of 140° C. and a pressure of 1.2 MPa in an autoclave was pressed for 20 minutes to obtain a laminated glass used for sound insulation measurement.

The laminated glass is vibrated by a vibration generator for a dumping test, and the resulting vibration characteristics are amplified with a mechanical impedance measuring device, and the vibration spectrum is analyzed with an FFT spectrum analyzer, and L/F (loss factor) over time after glass bonding. ) Values are obtained and shown in Table 2 below and Fig. 2 attached thereto. The measurement was carried out at the same time every day, and the L/F value at 20° C. was expressed over the passage of time per day.

Measure
Viewpoint Right after joining 1 day 2 days 3 days 4 days 5 days 6 days 7 days 8 days Example 1 0.41 0.41 0.41 0.41 0.41 0.41 0.41 0.41 0.41 Example 2 0.34 0.34 0.34 0.34 0.34 0.34 0.34 0.34 0.34 Example 3 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 Comparative example 0.24 0.26 0.28 0.3 0.31 0.33 0.34 0.35 0.35 Measure
Viewpoint 9th 10 days 11th 12 days 13th 14 days Maximum reach period Maximum/minimum deviation - Example 1 0.41 0.41 0.41 0.41 0.41 0.41 0 0 - Example 2 0.34 0.34 0.34 0.34 0.34 0.34 0 0 - Example 3 0.37 0.37 0.37 0.37 0.37 0.37 0 0 - Comparative example 0.35 0.35 0.34 0.33 0.33 0.33 7 0.02 -

Referring to the experimental results of Table 2 and FIG. 2, in the case of the embodiments to which the core part of the present invention is applied, excellent sound insulation properties are shown immediately after glass bonding, regardless of the amount of plasticizer applied to the sound insulation core layer is large or small. It was confirmed that there was no change. However, in the case of the comparative example that did not apply the functional retention layer of the present invention, it was confirmed that it showed a considerably low sound insulation property immediately after glass bonding, then gradually increased, and the highest value was shown around 7-11 days.

In addition, after 14 days when the L/F value of the comparative example was stabilized, the L/F values of each of the samples of Comparative Examples and Examples were measured in units of 5 degrees at 10 to 30°C, and are shown in Table 3 below.

L/F@ 10℃ 15℃ 20℃ 25℃ 30℃ Example 1 0.23 0.33 0.41 0.33 0.21 Example 2 0.21 0.27 0.34 0.33 0.24 Example 3 0.24 0.32 0.37 0.28 0.19 Comparative example 0.22 0.31 0.34 0.3 0.21

Referring to the results of Table 3, the glass bonding film of the example has excellent sound insulation properties at 20°C, which is a criterion for evaluation of physical properties, compared to the glass bonding film of the comparative example, and is equal or excellent overall at 10 to 30°C. Showed the results. In particular, Example 1 shows equal or superior results at 10, 20, and 30° C. compared to Comparative Examples, and this is evaluated as a result of improving both low-temperature sound insulation properties and high-temperature sound insulation properties that are difficult to improve at the same time. .

4. Evaluation of mechanical performance of glass bonding film

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

A 2.1 T-thick glass of 300 mm × 300 mm and each of the examples and films was prepared in a laminated structure of glass-film-glass, and pre-bonded with vacuum to degas and edge sealing. Thereafter, specimens were prepared by bonding them at 150° C. for 2 hours using an autoclave. Thereafter, a 2.26 kg steel ball was dropped onto the specimen, and the height (MBH) through which the specimen penetrated was measured. At this time, if it penetrates at a height of less than 4 m, it is evaluated as fail, and if it is penetrated at a height of 4 m or more, it is evaluated as pass.

All samples of Examples 1 to 3 and Comparative Examples were evaluated as pass.

Based on KS L 2007:2008, the evaluation of the absence or absence of missing polyvinyl acetal film-bonded laminated glass (impact resistance evaluation) was conducted. Specifically, the process of manufacturing and bonding each of the 2.1 T-thick glass and film in a laminated structure of glass-film-glass was carried out in the same manner as the penetration resistance evaluation above.

Low-temperature evaluation was conducted by dropping a 227 g steel ball at a height of 9 m after storage at -20 °C for 4 hours, and the impacted specimen is broken and the glass is scattered or the amount of glass falling from the sheet is 15 g or more. If the received specimen is not broken or the amount of glass falling from the sheet due to scattering of glass is less than 15 g, it is marked as pass.

Room temperature evaluation is to fail when the 227 g steel ball is stored at 40°C for 4 hours, and the shocked specimen at a height of 10 m is broken and the glass is scattered or the amount of glass falling from the sheet is 15 g or more. When the amount of glass falling from the sheet due to unbreakable or scattering was less than 15 g, it was marked as pass.

All samples of Examples 1 to 3 and Comparative Examples were evaluated as pass in low temperature evaluation and room temperature evaluation.

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

100: light-transmitting laminate
1, 2: light transmitter, glass
10: glass bonding film
21, 22: skin layer
30: core part
35: sound insulation core layer
32, 34: functional retention layer

Claims (11)

Includes; a core portion including a sound insulation core layer containing a polyvinyl acetal resin and a plasticizer for the core, and a functional retention layer positioned on one or both surfaces of the sound insulation core layer to maintain sound insulation performance, and
The function holding layer contains a polyester resin,
The thickness of the functional retention layer is 1 to 10 um,
The loss factor value measured at 10°C is 0.21 or more, and the loss factor value measured at 30°C is 0.19 or more.
The method of claim 1,
The glass bonding film is a glass bonding film that takes within 48 hours from the time of glass bonding to reaching the maximum sound insulation properties.
The method of claim 1,
Containing, a glass bonding film that is located on one side or both sides of the core part.
The method of claim 1,
The functional retention layer is a stretched polyester film, a film for glass bonding.
The method of claim 1,
The sound insulating core layer comprises 32 to 45% by weight of the plasticizer based on the entire sound insulating core layer, glass bonding film.
Includes; a core portion including a sound insulation core layer containing a polyvinyl acetal resin and a plasticizer for the core, and a functional retention layer positioned on one or both surfaces of the sound insulation core layer to maintain sound insulation performance, and
The deviation between the minimum sound insulation property value and the maximum sound insulation property value measured within 30 days after glass bonding is within 0.018,
The thickness of the functional retention layer is 1 to 10 um,
A film for glass bonding, having a loss factor of 0.21 or more measured at 10°C and a loss factor of 0.19 or more measured at 30°C.
delete The method of claim 6,
The glass bonding film has a loss coefficient value of 0.34 or more measured at 20° C., a glass bonding film.
The method of claim 6,
The functional retention layer is a polyester layer containing a polyethylene terephthalate resin, a film for glass bonding.
The method of claim 6,
The glass bonding film has a loss factor value of 0.25 or more measured at 15° C., and a loss coefficient value of 0.26 or more measured at 25° C., a film for glass bonding.
It includes a laminate comprising two sheets of light transmitting body, a glass bonding film positioned between the two sheets of light transmitting body, wherein the glass bonding film is according to claim 1 or 6, light transmitting laminate sieve.

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