JP2021175704A - Seal material and multiple glass using the same - Google Patents

Abstract

To provide a seal material for multiple glass having excellent fire resistance performance and a multiple glass using the same.SOLUTION: A sealing material characterized in that the sealing material that seals the peripheral edge of a multiple glass in which two or larger glass plates are disposed opposite to each other by separating through a spacer so as to form a hollow layer between them, in which the ratio of butyl rubber to the total amount of butyl rubber and crystalline polyolefin is 98 mass% or larger to 100 mass% or smaller, and the ratio of crystalline polyolefin is 0 mass% or larger and 2 mass% or smaller (including when crystalline polyolefin is not included), the ratio of the inorganic filler relative to a total 100 pts.mass of butyl rubber and crystalline polyolefin is 100 pts.mass or larger and 250 pts.mass or smaller.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sealing material and a double glazing using the same.

Conventionally, in a multilayer glass in which two or more glass plates are spaced apart from each other with a spacer alone so as to form a hollow layer between them, the spacer has a JIS A hardness of 10 at 25 ° C. The thermoplastic resin composition comprises ~ 90 thermoplastic resin compositions, and the thermoplastic resin composition contains a butyl rubber, a crystalline polyolefin, a desiccant and an inorganic filler, and is butyl based on the total amount of the butyl rubber and the crystalline polyolefin. The ratio of rubber is 50 to 98% by weight, the ratio of crystalline polyolefin is 2 to 50% by weight, and the ratio of inorganic filler to 100 parts by weight of the total of butyl rubber and crystalline polyolefin is 200 parts by weight or less. Layered glass is known (see, for example, Patent Document 1).

Further, in FIG. 4 of Patent Document 1, the hollow layer is shielded from the outside air by interposing the primary sealing material 3 between the glass plates 1a and 1b and the metal spacer 2, and those glass plates facing each other are shielded from the outside air. There is disclosed a double glazing in which a void (recess) formed by an inner surface of a peripheral edge of a glass and an outer peripheral surface of a spacer is sealed with a room temperature curing type secondary sealing material typified by a polysulfide type or a silicone type. .. Further, FIG. 5 of Patent Document 1 discloses a double glazing made by using a resin kneaded with a desiccant as a spacer 4 and sealing it with a room temperature curing type secondary sealing material.

Japanese Unexamined Patent Publication No. 10-114551

By the way, various standards are set to guarantee the quality of double glazing, but when the double glazing is configured as a fireproof double glazing for fire protection, ISO834-1 is used as a standard for durability performance in the event of a fire. : It is required to pass the fire resistance test based on 1999.

Such a fire resistance test is performed by radiating a flame toward the front surface of the double glazing with a burner for a predetermined time, and the flame does not penetrate the double glazing and the double glazing can withstand the predetermined time without collapsing. Is required. Here, whether or not the double glazing collapses depends largely on the fire protection performance of the sealing material (hereinafter, also referred to as “secondary sealing material”) that seals the peripheral edge of the double glazing.

Therefore, an object of the present invention is to provide a sealing material for double glazing having excellent fire resistance and a double glazing using the same.

In order to achieve the above object, the sealing material according to one aspect of the present invention is a double glazing in which two or more glass plates are spaced apart from each other via a spacer so as to form a hollow layer between them. It is a sealing material that seals the peripheral part of
The sealing material has a butyl rubber and an inorganic filler, and the ratio of the butyl rubber to the total amount of the butyl rubber and the crystalline polyolefin is 98% by mass or more and 100% by mass or less, and the ratio of the crystalline polyolefin is 0% by mass. It is less than 2% by mass (including the case where crystalline polyolefin is not contained).
The ratio of the inorganic filler to 100 parts by mass of the total of the butyl rubber and the crystalline polyolefin is 100 parts by mass or more and 250 parts by mass or less.

According to the present invention, it is possible to provide a sealing material for double glazing having high fire protection performance and double glazing using the same.

It is a figure which showed the secondary sealing material and the double glazing which concerns on 1st Embodiment of this invention. It is a figure which showed the example which made the double glazing which concerns on 1st Embodiment of this invention by using the glass having fire resistance and Low-E glass. It is a figure for demonstrating the method of the fire resistance test based on ISO8341: 1999. It is a figure which showed the furnace 200 shown in FIG. 3 from the front. It is a figure which showed the heating curve which conformed to ISO8341: 1999. It is a figure which showed the arrangement of the double glazing such that Low-E glass 11a of a double glazing is arranged on a heating side, and glass 10a having fire resistance is arranged on a non-heating side. It is a figure which showed the arrangement of the double glazing such that the Low-E glass 11a of the double glazing 100 is arranged on the non-heated side, and the glass 10a having fire resistance is arranged on a heated side. It is a figure which showed the secondary sealing material which concerns on 2nd Embodiment, and the double glazing to which it applied.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram showing a secondary sealing material and double glazing according to the first embodiment of the present invention. In FIG. 1, the double glazing 100 includes a first glass 10, a second glass 11, a spacer 20, a desiccant 30, a hollow layer 40, a primary sealing material 50, and a secondary sealing material 60. And.

As shown in FIG. 1, in the double glazing 100, the first glass 10 and the second glass 11 are arranged to face each other, and the space between the first glass 10 and the second glass 11 facing each other by the spacer 20 is set. By definition, the hollow layer 40 is formed. Then, the primary sealing material 50 is provided between the first glass 10 and the spacer 20, and between the second glass 11 and the spacer 20, respectively. Although the primary sealing material 50 is drawn thick for easy understanding, it is actually extremely thin and has a thickness that is negligible as a whole compared to the thickness of the entire double glazing, for example, 0.1 to 1. The thickness is set within the range of about 0.8 mm, and may be set to, for example, about 0.3 mm.

Further, an adhesive may be used between the primary sealing material 50 and the first glass 10 and the second glass 11, if necessary, to form an adhesive layer.

A secondary sealing material 60 is provided on the peripheral edge of the double glazing 100 so as to cover the outer periphery of the spacer 20 and the primary sealing material 50. The secondary sealing material 60 is provided so as to fill the peripheral space between the first glass 10 and the second glass 11, and serves to seal the hollow layer 40. The desiccant 30 is provided to absorb the moisture in the hollow layer 40 and keep the hollow layer 40 in a dry state.

In the present technical field, generally, a sealing material provided on the peripheral edge of the double glazing 100 so as to surround the outer peripheral surface of the spacer 20 is often referred to as a "secondary sealing material". That is, regardless of the presence or absence of the primary sealing material, the sealing material provided at the position surrounding the outer peripheral surface of the spacer 20 is often referred to as the secondary sealing material. Therefore, in the present embodiment, the sealing material provided so as to cover the outer peripheral surface (side surface) of the spacer 20 will be referred to as a secondary sealing material regardless of the presence or absence of the primary sealing material. Further, when simply referred to as "sealing material", both the primary sealing material and the secondary sealing material are included, but the primary sealing material is between the spacer 20 and the first glass 10 and between the spacer 20 and the second. Since it is provided between the glass 11 and the glass 11, it can be distinguished by its position.

In FIG. 2, fireproof glass 10a is used as one embodiment of the first glass 10, Low-E glass 11a is used as the second glass 11, and the double glazing 100 is a fireproof double glazing. It is constructed as glass.

The Low-E glass 11a is a glass plate in which the surface on the hollow layer 40 side is coated with a low-radioactive Low-E metal film 16.

Glass 10a with fire resistance is the flame insulation of "Fire protection performance test / evaluation work method manual (published by Building Materials Testing Center, established on June 1, 2000, final change on July 13, 2020)". -Semi-flame insulation performance test A glass plate that has a flame insulation performance of 20 minutes or more by a test method based on the evaluation method, and includes wire-reinforced glass, heat-resistant plate glass, and chemically strengthened glass.

Here, the wire-reinforced glass refers to the wire-reinforced plate glass defined by JIS R3204 (wire-filled plate glass and wire-filled plate glass). The wire-reinforced glass has a metal net inside the glass plate and is configured to increase the strength of the glass. The nets are, for example, arranged in a grid pattern in the wire-reinforced glass.

The heat-resistant glass plate refers to the plate glass specified by the "heat-resistant plate glass quality standard" established by the Curtain Wall / Fire Protection Aperture Association. There are three types of heat-resistant plate glass: low-expansion fireproof glass, heat-resistant tempered glass, and heat-resistant crystallized glass.

Chemically tempered glass refers to glass whose strength is increased by forming a compressive stress layer on the surface of the glass by a chemical tempered method. Chemically tempered glass is obtained by immersing a glass plate such as soda lime silicate glass containing a Na component or a Li component in a molten salt such as potassium nitrate, and Na ions and / or Li having a small atomic diameter existing on the surface of the glass plate. It is manufactured by using a tempering technique for forming a compressive stress layer on the surface layer of a glass plate to increase the strength by replacing the ions with K ions having a large atomic diameter existing in the molten salt.

Chemically tempered glass has better visibility and design than wire-reinforced glass, and has a lower risk of thermal cracking. In addition, chemically strengthened glass has a lower risk of natural damage than heat-resistant tempered glass, and can ensure strength and fire protection performance even when thinned. Furthermore, since chemically strengthened glass can suppress warpage more than heat-resistant tempered glass, it is difficult for gaps in the sealing material to open when double glazing is used, and it is difficult for flames to leak from the periphery of double glazing in the event of a fire. And can improve fire protection performance.

The surface compressive stress value is preferably 300 MPa or more and 1000 MPa or less on at least one main surface of the main surface on which the compressive stress layer of the chemically strengthened glass is formed. When the surface compressive stress value is 300 MPa or more, the mechanical strength of the chemically strengthened glass is high. When the surface compressive stress value is 1000 MPa or less, the manufacturing cost can be reduced and the depth of the compressive stress layer can be secured.

On at least one of the main surfaces on which the compressive stress layer of the chemically strengthened glass is formed, the thickness of the compressive stress layer in the plate thickness direction is preferably 20 μm or more and 50 μm or less. When the thickness of the compressive stress layer is 20 μm or more, sufficient strength against an external force can be obtained. When the thickness of the compressive stress layer in the plate thickness direction is 50 μm or less, the immersion in the molten salt may be short, and chemically strengthened glass can be easily obtained.

The thickness of the first glass 10 may be, for example, 3 mm or more and 11 mm or less, 6.8 mm, or 10 mm. The thickness of the second glass 11 may be, for example, 2.5 mm or more and 19 mm or less, 3 mm or more and 10 mm or less, or 5.0 mm. However, the thickness of the first glass 10 and the second glass 11 can be various depending on the use of the double glazing 12.

Since the secondary sealing material 60 according to the present embodiment is excellent in fireproof performance, it can be suitably used for fireproof double glazing in which fireproof glass 10a and Low-E glass 11a are combined. It can also be used for double glazing in which the glass plates of the above are opposed to each other. Therefore, the secondary sealing material 60 and the double glazing 100 using the same are not limited to the fireproof double glazing, and can be applied to ordinary double glazing.

First, before explaining the secondary sealing material 60 and the double glazing 100 using the secondary sealing material 60 according to the present embodiment, a fire protection test will be described. The fire protection test is a test for which a fire resistance test based on ISO8341: 1999 is targeted, and passing this test is an index showing the fire resistance of double glazing.

FIG. 3 is a diagram for explaining a method of fire resistance test based on ISO8341: 1999. As shown in FIG. 3, a burner 210 and a thermometer 220 are provided in the furnace 200, and the double glazing 100 to be tested is attached to the opening 201 of the furnace 200. FIG. 4 is a front view of the furnace 200 shown in FIG. In terms of flame insulation performance, in the state shown in FIGS. 3 and 4, the heating curve conforming to ISO834 (T = 345 log10 (8t + 1) + 20, T: furnace temperature (° C), t: time (minutes) )), The double glazing 100 is heated for 20 minutes.

FIG. 5 is a diagram showing a heating curve based on ISO8341: 1999. The inside of the furnace 200 is heated by the burner 210 so that the temperature inside the furnace measured by the thermometer 220 has a temperature gradient as shown in FIG. 5, and the fire resistance test of the double glazing 100 is performed.

The pass of the fire resistance test is when the double glazing 100 is endured for 20 minutes in a state where the flame does not penetrate and there is no continuous flame for 10 seconds on the non-heated side. More precisely, there is no flame eruption to the non-heated side for more than 10 seconds, no flame to continue for more than 10 seconds to the non-heated side, damage such as cracks through which the flame passes, and gaps. Passes if all of the above conditions are met. For example, if the two glasses 10 and 11 of the double glazing 100 collapse, the flame penetrates the double glazing 100, and the secondary sealing material 60 and the spacer 20 burn to cause cracks through which the flame passes. If a gap is created, flames will be generated from the four sides of the double glazing 100. Therefore, the fire resistance of the secondary sealing material 60 is the key to passing the fire resistance test. The fire resistance test is performed on both the front and back surfaces of the double glazing 100.

FIG. 6 is a diagram showing the arrangement of the double glazing 100 such that the Low-E glass 11a of the double glazing 100 is arranged on the heating side and the fireproof glass 10a is arranged on the non-heating side. In this case, since the fireproof glass 10a is on the non-heated side, even if the Low-E glass 11a collapses, the fireproof glass 10a on the non-heated side often endures and passes.

FIG. 7 is a diagram showing the arrangement of the double glazing 100 such that the Low-E glass 11a of the double glazing 100 is arranged on the non-heated side and the fireproof glass 10a is arranged on the heated side. In this case, since the Low-E metal film 16 of the Low-E glass 11a reflects heat inside the furnace 200, the heating pace of the fireproof glass 10a is faster than in the case of FIG. Then, when the inside of the secondary sealing material 60 and the spacer 20 burns and the fireproof glass 10a collapses, the Low-E glass 11a is not as fireproof as the fireproof glass 10a, so that a flame is generated. Often penetrates. That is, due to the configuration, the arrangement pattern shown in FIG. 7 tends to be rejected. In order to pass the fire protection test with the arrangement shown in FIG. 7, it is required to improve the heat resistance of the secondary sealing material 60 and prevent the fireproof glass 10a from collapsing as much as possible.

When a metal spacer, for example, a spacer made of aluminum is used for the spacer 20, even if the secondary sealing material 60 burns, the spacer 20 can often prevent the spacer 20 from collapsing. On the other hand, when the spacer 20 is made of resin or vinyl chloride, if the secondary sealing material 60 burns, the spacer 20 cannot withstand it, and the Low-E glass 11a often collapses.

Therefore, if the fire protection performance of the secondary sealing material 60 is improved, the fire protection test can be passed regardless of the material of the spacer 20.

Hereinafter, the secondary sealing material 60 capable of passing the fire resistance test based on ISO8341: 1999 and the double glazing 100 using the secondary sealing material 60 will be described in detail again with reference to FIG.

In FIG. 1, first, the spacer 20 may be either an aluminum spacer or a resin spacer.

Conventionally, double glazing using aluminum spacers has been used, but in recent years there has been an increasing need for improving the heat insulating properties around the glass, and resin spacers using vinyl chloride, etc., which have higher heat insulating properties than aluminum spacers, There is an increasing need for a desiccant-kneaded type spacer. (The dry type kneading type spacer will be described later).

As described above, when a resin spacer or a desiccant-kneaded type resin spacer is used, a decrease in fire protection performance is a problem.

That is, since aluminum itself is a non-combustible material for the aluminum spacer, the shape of the spacer itself can be maintained even after the fire resistance test.

On the other hand, since the resin spacer uses a hard resin material such as vinyl chloride, melting, decomposition, and combustion occur during the fire resistance test, and it is difficult to maintain the shape. Similarly, even in the resin kneaded type spacer, since the matrix is made of resin, melting, decomposition, and combustion occur when the fire resistance test is performed, and it is also difficult to maintain the shape.

Generally, as the secondary sealant, a silicone-based sealant, a polysulfide-based sealant, or a hot-melt butyl-based sealant is used.

Silicone sealants have high heat resistance, but their gas barrier performance is not high, so there remains concern about the life of double glazing. Polysulfide-based sealants have high gas barrier properties, but have insufficient fire protection performance, and generate acid gas during combustion. The hot melt butyl sealant has very high gas barrier performance, but its fire protection performance is insufficient.

The secondary sealing material 60 according to the present embodiment is a hot melt butyl sealant, but is a sealant with significantly improved fire protection performance. The secondary sealing material 60 according to the present embodiment is a seal that can secure fire protection performance and has high durability as a double glazing 100 even when the spacer 20 is a resin spacer or a desiccant kneaded type spacer. Make up the material. The contents will be described in detail below.

The secondary sealing material 60 according to the present embodiment contains a butyl rubber, a crystalline polyolefin, and an inorganic filler, and the ratio of the butyl rubber to the total amount of the butyl rubber and the crystalline polyolefin is 98% by mass or more and 100% by mass. % Or less, the ratio of crystalline polyolefin is 0% by mass or more and less than 2% by mass (including the case where crystalline polyolefin is not contained), and the ratio of the inorganic filler to 100 parts by mass of the total of butyl rubber and crystalline polyolefin. Is 100 parts by mass or more and 250 parts by mass or less.

The above-mentioned butyl rubber includes butyl rubber, halogenated butyl rubber, polyisobutylene, and partially vulcanized butyl. These are hot-melt butyl rubbers and can be hot-melt molded. Compared to silicone, it has the advantages of high moisture resistance and long life in normal use. There is also a sealing material made of polysulfide, but it is not suitable because it contains a sulfur component and may release toxic gas during combustion.

However, butyl rubber basically has the property of being flammable, and it is difficult to pass the fire resistance test as it is. However, in the present embodiment, the above-mentioned formulation greatly improves the fire protection performance. It is improving.

It is preferable that the butyl rubber is not crosslinked. This is because the fluidity as a secondary sealing material is improved because it is not crosslinked.

The ratio of the butyl rubber to the total amount of the butyl rubber and the crystalline polyolefin is 98% by mass or more, preferably 99% by mass or more, more preferably 99.5% by mass or more, and particularly preferably 100% by mass. Further, the ratio of the butyl rubber to the total amount of the butyl rubber and the crystalline polyolefin is 100% by mass or less, may be 99.9% by mass or less, or may be 99.8% by mass or less. , 99.5% by mass or less.

The secondary sealing material 60 according to the present embodiment contains polyisobutylene as a butyl rubber, and the proportion of polyisobutylene is preferably 5% by mass or more and 20% by mass or less. When the proportion of polyisobutylene is 5% by mass or more, the adhesion between the secondary sealing material 60 and the first glass 10 and the second glass 11 is good. The proportion of polyisobutylene is more preferably 5% by mass or more, and particularly preferably 8% by mass or more. Further, when the proportion of polyisobutylene is 20% by mass or less, the secondary sealing material 60 does not easily flow and the shape retention is good. The proportion of polyisobutylene is more preferably 15% by mass or less, and particularly preferably 12% by mass or less.

The secondary sealing material 60 according to the present embodiment may contain crystalline polyolefin together with butyl rubber, and the crystalline polyolefin is a copolymer of an olefin such as ethylene or propylene or a copolymer with other monomers. Polymers and their modified products that have crystallinity. The structure of the polymer is preferably a syndiotactic structure or an isotactic structure, but may include other structures. Ethylene and propylene are particularly preferable as the olefin.

Copolymers include copolymers of two or more types of olefins and copolymers of olefins and other monomers, and copolymers of ethylene and propylene with other monomers that do not inhibit crystallinity. Appropriate. Further, as the copolymer, a block copolymer is more suitable than an alternating copolymer or a random copolymer. Modified products include crystalline polyolefins having a functional group such as an acid anhydride group, a carboxyl group, and an epoxy group introduced therein.

Since the crystalline poreolefin is effective in maintaining the shape of the double glazing 100, it contributes to the performance improvement of the double glazing 100 rather than the fire protection performance.

In the above resin composition, the ratio of the crystalline polyolefin to the total amount of the butyl rubber and the crystalline polyolefin is 0% by mass or more and less than 2% by mass. That is, the crystalline polyolefin is not essential and may be contained as a component if necessary. The ratio of the crystalline polyolefin to the total amount of the butyl rubber and the crystalline polyolefin is preferably 1% by mass or less, more preferably 0.5% by mass or less, and particularly preferably not containing the crystalline polyolefin. Further, the ratio of the crystalline polyolefin to the total amount of the butyl rubber and the crystalline polyolefin when the crystalline polyolefin is contained may be 0.1% by mass or more, or 0.2% by mass or more. It may be 0.5% by mass or more.

The secondary sealing material 60 according to the present embodiment contains an inorganic filler. The ratio of the inorganic filler to 100 parts by mass of the total of the butyl rubber and the crystalline polyolefin is 100 parts by mass or more, preferably 150 parts by mass or more, and more preferably 180 parts by mass or more. The ratio of the inorganic filler to 100 parts by mass of the total of the butyl rubber and the crystalline polyolefin is 250 parts by mass or less, may be 230 parts by mass or less, or may be 220 parts by mass or less. Since the inorganic filler has many components that leave a residue even when burned, it contributes to improving the fire protection performance of the secondary sealing material 60. Examples of the inorganic filler include talc, calcium carbonate, silica, magnesium hydroxide, carbon black, expanded black smoke, and an adsorbent.

Talc, calcium carbonate and silica powders are used as fillers and contribute to shape retention after combustion. Since these are non-combustible materials and help maintain their shape even when burned, they are preferably blended in a fixed ratio. It is preferable to use talc or calcium carbonate rather than silica powder.

The particle size of talc is, for example, preferably 3 μm or more and 10 μm or less, more preferably 4 μm or more and 8 μm or less, and further preferably 4 μm or more and 6 μm or less at d50 of the median diameter.

Magnesium hydroxide and hydrous silica function as flame retardants, release water during combustion, and have the effect of suppressing combustion. That is, since it has the effect of cooling the combustion with water, it is useful for improving the fire protection performance.

Among carbon blacks, furnace type carbon black has an adsorption effect equivalent to that of activated carbon, and has an effect of adsorbing oxygen and combustion gas to delay combustion. Thereby, the fire protection performance of the secondary sealing material 60 can be improved. Carbon black has a very large specific surface area of nitrogen, and exerts a large trapping effect on combustion gases such as methane and carbon monoxide.

Among the carbon blacks, the hard carbon type carbon black has a relatively large surface area, and is preferable for fire prevention applications while increasing the strength of rubber. Nitrogen specific surface area of the carbon black is preferably at ^{50 m} 2 / g or more 200 meters ² / g or less, more preferably at most ^55m 2 / g or more ^{150m 2 / g, 60m 2 /} g or more 120 m ² / g The following is more preferable. The hard carbon type carbon black is more preferably the HAF type.

Expanded graphite expands during combustion and contributes to maintaining the shape of the double glazing. That is, it expands during combustion and plays a role of covering the burned-out portion of the secondary sealing material 60.

The adsorbent has the effect of adsorbing flammable gas and has the effect of delaying combustion. The flammable gas includes, for example, methane and carbon monoxide. Combustion can be suppressed by adsorbing these flammable gases. Examples of the adsorbent include zeolite powder and silica gel. It is preferable to use powder as the zeolite.

In addition, it is preferable to use a thermal decomposition accelerator as an additive. Examples of the thermal decomposition accelerator include organic sulfur compounds, and more specifically, thioethers. Thioether is a material that promotes thermal decomposition at 200-350 ° C., and plays a role of promoting thermal decomposition at low temperature and reducing combustion components at high temperature.

These inorganic filler components do not have to contain all of them, but may contain at least one or more components. However, in order to improve the fire protection performance, it is preferable that at least two of the above-mentioned inorganic filler components are contained, more preferably at least three are contained, and at least four are contained. Is even more preferable.

The adhesive may or may not be used, but when it is used, for example, a urethane-based adhesive made from a polyolefin-based polyol, a non-yellowing isocyanate, and a derivative of the non-yellowing isocyanate is used. You may. Since these adhesives are crosslinked adhesives that do not melt, they have the property of staying in place without melting even when heated, and the fire protection performance of the double glazing 100 can be enhanced.

The JIS A hardness of the secondary sealing material at 25 ° C. is preferably 50 or more and 90 or less. This is a performance required for a normal double glazing 100 rather than a fire protection performance, and is preferably a hardness of 50 or more in order to maintain the shape of the double glazing 100. Further, in order to prevent the glass 10 and 11 of the double glazing 100 from breaking, the hardness is preferably 90 or less. Further, the JIS A hardness of the secondary sealing material 60 at 25 ° C. is preferably 55 to 90.

According to the first embodiment, the fire protection performance can be improved by blending an inorganic filler that improves the fire protection performance while using the butyl sealant as the base material, and the fire protection test based on ISO8341: 1999 can be passed. The secondary sealing material 60 and the double glazing 100 can be formed.

Specifically, when the mass of the secondary sealing material at room temperature is A, the temperature is raised from room temperature at a rate of 10 ° C./min in an air atmosphere, and the mass at 500 ° C. is B. The ratio B / A can be 40% or more. The ratio of the mass B to the mass A is the residual ratio of the secondary sealing material 60 at 500 ° C. when the temperature of the secondary sealing material 60 is raised at a rate of 10 ° C./min and gradually melts and loses its shape. Can be thought of. According to the secondary sealing material 60 according to the present embodiment, the residual ratio can be 40% or more, and the fire protection performance can be improved.

[Second Embodiment]
FIG. 8 is a diagram showing a secondary sealing material and double glazing according to the second embodiment.

The double glazing 101 in the second embodiment is different from the double glazing 100 in the first embodiment in that it includes a desiccant kneading type spacer 21 instead of the spacer 20. Other than that, it is the same as the double glazing 100 in the first embodiment, and since the first glass 10 and the second glass 11 have the same configuration as that in the first embodiment, they have the same reference numerals. It is attached. The material of the secondary sealing material 61 is the same as that of the second sealing material 60 according to the first embodiment, but only the shape is different because the shape of the resin spacer 21 is different from that of the spacer 20. ing.

The desiccant kneading type spacer 21 is a spacer configured as a desiccant kneading type spacer which is widely used recently, and has a configuration in which the desiccant 30 is kneaded into the spacer. Since the desiccant-kneaded type spacer is also configured as a resin spacer, its fire protection performance is lower than that of a metal spacer.

As for such a desiccant kneading type spacer 21, the secondary sealing material 60 according to the present embodiment is applied, the glass 10a having fire resistance is used as the first glass 10, and the low is used as the second glass 11. By using the −E glass 11a and using the double glazing 100 as the fireproof double glazing, it is possible to construct the double glazing 101 that can pass the fireproof test based on ISO8341: 1999.

As described above, the secondary sealing material 60 according to the present embodiment can be applied to various spacers 20, 21 and double glazing 100, 101.

[Example]
Hereinafter, an example in which the double glazing 100 is constructed by using the secondary sealing material 60 according to the first embodiment and a fire protection test based on ISO8341: 1999 is performed will be described.

For the components described below, the reference numerals used in the first embodiment will be used in the same manner for easy understanding.

In this embodiment, a meshed glass having a thickness of 6.8 mm is used as the first glass 10, a Low-E glass having a thickness of 5 mm is used as the second glass 11, and the thickness of the hollow layer 40 is 12 mm. bottom. The width of the first glass 10 and the second glass 11 was 900 mm, and the height was 2000 mm.

As the spacer 20, TGI (registered trademark) -Spacer M (manufactured by TECHNOFORM), which is a non-metal and is made of a mixture of plastic and stainless steel, was used. The height of the spacer 20 was 6.85 mm.

As the primary sealing material 50, SM-488 manufactured by Yokohama Rubber Co., Ltd., which is made of a heat-flexible polyisobutylene-based sealing material, was used. The thickness of the primary sealing material 50 was 0.3 mm on one side.

As shown in Table 1, the secondary sealing material 60 was constructed by changing the ratios of the butyl rubber, the crystalline poreolefin and the inorganic filler, and further changing the components contained in the inorganic filler.

Butyl 365 manufactured by JSR Corporation was used as the butyl rubber. Opanol B15 manufactured by BASF was used as the polyisobrene. As polyethylene, LJ902 manufactured by Nippon Polyethylene Co., Ltd. was used. As the talc, FH104A manufactured by Fuji Tarc Co., Ltd. was used. As calcium carbonate, Whiten SB Red manufactured by Shiraishi Calcium Co., Ltd. was used. Magnesium N manufactured by Konoshima Chemical Co., Ltd. was used as magnesium hydroxide. As carbon black, Tokai Carbon Co., Ltd. Seest 3 was used. As the expanded graphite, 955025L manufactured by Ito Graphite Industry Co., Ltd. was used. As an adsorbent, Molecular Sieve 4A powder manufactured by Union Showa Co., Ltd. was used. As the tackifier, TRez HA125 manufactured by JXTG was used.

The double glazing 100 was constructed under such conditions, and a fire resistance test based on ISO8341: 1999 was performed. The fire resistance test was carried out with the same contents as described in FIGS. 3 to 7.

The results of Examples and Comparative Examples are shown in Table 1.

表１に示されるように、実施例１〜５のうち、実施例１〜４は結晶性ポレオレフィンを含まず、ブチル系ゴム、無機フィラー及び添加剤のみを含む組成となっている。実施例５は、結晶性ポレオレフィンを０．５質量％含んでいる。

As shown in Table 1, of Examples 1 to 5, Examples 1 to 4 do not contain crystalline poreolefin, and have a composition containing only butyl rubber, an inorganic filler, and an additive. Example 5 contains 0.5% by mass of crystalline poreolefin.

Further, in all of Examples 1 to 5, the ratio of the inorganic filler to 100% by mass of the total of the butyl rubber and the crystalline poreolefin is 100% by mass or more. Further, in Examples 1 to 5, the proportion of butyl rubber is 20% by mass and the proportion of polyisobutylene is 10% by mass among the butyl rubbers. As described above, the crystalline polyolefin does not contain Examples 1 to 4, but only Example 5 contains 0.5% by mass of polyethylene.

Regarding the inorganic filler, in Example 1, talc, which is a non-combustible material, is 30% by mass, carbon black, which functions as an adsorbent (activated carbon) for oxygen and combustion gas, is 10% by mass, and zeolite 4A, which functions as an adsorbent for combustible gas. 20% by mass. Further, as an additive, a tackifier is contained in an amount of 10% by mass.

In Example 2, the composition of the inorganic filler is such that the talc of Example 1 is reduced from 30% by mass to 20% by mass, and 10% by mass of expanded graphite is added accordingly.

In Example 3, based on Example 1, calcium carbonate was added instead of talc as a non-combustible material to make 10% by mass, and 20% by mass of magnesium hydroxide functioning as a flame retardant that releases water during combustion was added. The composition is as follows.

In Example 4, the composition of the components is the same as that of Example 1, but the composition ratio is changed by using 25% by mass of talc, 25% by mass of carbon black, and 10% by mass of the adsorbent.

In Example 5, based on Example 1, the amount of polyethylene added as crystalline poreolefin by 0.5% by mass was subtracted from the talc to obtain 29.5% by mass, carbon black was 20% by mass, and the adsorbent. Is 15% by mass and the adsorption-imparting agent is 5% by mass, and the mass composition thereof is also changed.

On the other hand, as a comparative example, as Comparative Example 1, in the example of using the existing hot melt butyl sealant, the ratio of the inorganic filler to 100 parts by mass of the total of the butyl rubber and the crystalline poreolefin is 33 parts by mass. The composition is different from that of Examples 1 to 5, which is 100 parts by mass or more.

Comparative Example 2 has a composition similar to that of Examples described in WO 2018/199177. The ratio of the butyl rubber to the total amount of the butyl rubber and the crystalline poreolefin was 89.8% by mass, which was less than 98%, which was smaller than that of Examples 1 to 5. Further, the ratio of the inorganic filler to 100 parts by mass of the total of the butyl rubber and the crystalline poreolefin is 84 parts by mass, which is significantly smaller than 100 parts by mass or more of Examples 1 to 5.

Comparative Examples 3 and 4 have the same composition as those of Composition Examples 9 and 12 in Table 1 of Patent Document 1, and the ratio of the inorganic filler to 100 parts by mass of the total of the butyl rubber and the crystalline poreolefin is 91% by mass. The value is significantly smaller than 100 parts by mass or more of Examples 1 to 5.

Examples 1 to 5 and Comparative Examples 1 to 4 were configured with such a composition, and fire resistance tests were conducted on Examples 1 to 5 and Comparative Examples 1 and 2, and Examples 1 to 5 passed the test. Comparative Examples 1 to 4 failed.

The 500 ° C. combustion residue was evaluated as a finer evaluation index than passing or failing the test. The 500 ° C. combustion residue is heated from room temperature to 900 ° C. at a heating rate of 10 ° C./min in an air atmosphere using a thermogravimetric measuring device (thermogravimetric measuring device Q50 manufactured by TA Instruments) at 500 ° C. The amount of residue of was determined. Examples 1 to 5 were all around 60%, but Comparative Examples 1 to 4 were all less than 40%, which were 25% and 30%, respectively, which were less than half of the residues of Examples 1 to 5. rice field.

From these results, it is shown that the ratio of the inorganic filler has a great influence on the fire resistance performance of the secondary sealing material, and by setting this to 100 parts by mass or more, the fire resistance performance of the butyl rubber sealant can be significantly improved. Was done.

Considering Examples 1 to 5, Example 5 has the highest ratio at 63%, followed by Example 1 at 60%, followed by Example 2 at 59%, Example 4 at 58%, and Example 2 at 55%. It became.

Although it is a hypothesis, from the result of Example 5, the fire resistance performance may be higher when a small amount of crystalline polyolefin is contained, and from the result of Example 2, flame retardancy due to water generation of magnesium hydroxide is obtained. It is conceivable that increasing the amount of talc, which is a non-combustible material, may be more effective in improving the fire resistance than the sexual effect.

In particular, regarding the effects of polyethylene and talc, which are crystalline poreolefins, even when comparing the 500 ° C. combustion residues of Comparative Examples 1 and 2, Comparative Example 2 containing polyethylene and talc was 5 more than Comparative Example 1. Since it is% higher, it may have a higher effect than other ingredients.

As described above, according to the secondary sealing material according to the present embodiment, even when a resin spacer and a desiccant-kneaded type resin spacer are used for the double glazing, the fire resistance performance of the double glazing is improved. , A large amount of residue can be left even if the flame is radiated, and the fire resistance test based on ISO8341: 1999 can be passed.

Moreover, the JIS A hardness at 25 ° C. was measured. The JIS A hardness was measured in accordance with JIS K7215, and the value immediately after pressurization was measured using a type A hardness tester (GS-619RG manufactured by Teclock Co., Ltd.).

Although the preferred embodiments and examples of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments and examples, and can be applied to the above-mentioned examples without departing from the scope of the present invention. Various modifications and substitutions can be made.

For example, in the case of using chemically strengthened glass instead of wire-reinforced glass in the multilayer glass of Examples 1 to 5, low-expansion fireproof glass certified as heat-resistant plate glass by the Building Opening Association, heat-resistant. Similarly, when tempered glass or heat-resistant crystallized glass is used, the fire resistance test can be passed.

10 First glass 10a Fireproof glass 11 Second glass 11a Low-E glass 20, 21 Spacer 30 Drying agent 40 Hollow layer 50 Primary sealing material 60 Secondary sealing material 100, 101 Double glazing

Claims (13)

A sealing material in which two or more glass plates are separated from each other via a spacer so as to form a hollow layer between them, and seal the peripheral edge of the double glazing arranged so as to face each other.
The sealing material has a butyl rubber and an inorganic filler, and the ratio of the butyl rubber to the total amount of the butyl rubber and the crystalline polyolefin is 98% by mass or more and 100% by mass or less, and the ratio of the crystalline polyolefin is 0. It is equal to or more than 2% by mass and less than 2% by mass (including the case where crystalline polyolefin is not contained).
The ratio of the inorganic filler to 100 parts by mass of the total of the butyl rubber and the crystalline polyolefin is 100 parts by mass or more and 250 parts by mass or less.
Sealing material. The first glass and the second glass are used as a secondary sealing material for the double glazing in which they are arranged to face each other, the double glazing is attached to the opening of the furnace, and the peripheral portion of the double glazing is the sealing material. Sealed with, the burner is placed facing the first glass, and the heating curve conforming to ISO8341: 1999 (T = 345 log10 (8t + 1) + 20, T: furnace temperature (° C.), When the double glazing was heated for 20 minutes according to (t: time (minutes)) and a fire resistance test based on ISO8341: 1999 was carried out.
The sealing material according to claim 1, wherein when the fire resistance test is carried out, the flame from the burner does not penetrate the double glazing and the state where there is no continuous flame for 10 seconds is maintained for 20 minutes. The first glass is a glass having fire resistance and is
The sealing material according to claim 2, wherein the second glass is Low-E glass. The fireproof glass is wire-reinforced glass, and the thickness of the wire-reinforced glass is 6.8 mm.
The thickness of the Low-E glass is 5 mm, and the thickness is 5 mm.
The thickness of the hollow layer is 12 mm.
The sealing material according to claim 3, wherein the wire-reinforced glass and the second glass have a width of 900 mm and a height of 2000 mm. Claimed that the ratio B / A of the mass A of the sealing material at room temperature to the mass B when the temperature is raised from room temperature at a rate of 10 ° C./min to 500 ° C. in an air atmosphere is 40% or more. Item 2. The sealing material according to any one of Items 1 to 4. The sealing material according to any one of claims 1 to 5, wherein the butyl rubber is not crosslinked. The butyl rubber contains polyisobutylene and contains
The sealing material according to any one of claims 1 to 6, wherein the sealing material has a polyisobutylene ratio of 5% by mass or more and 20% by mass or less. The sealing material according to any one of claims 1 to 7, wherein the inorganic filler contains an adsorbent. The sealing material according to any one of claims 1 to 8, wherein the inorganic filler contains carbon black. The sealing material according to any one of claims 1 to 9, wherein the JIS A hardness at 25 ° C. is 55 to 90. Two glass plates placed facing each other,
A spacer provided between the two glass plates and defining the distance between the two glass plates,
A double glazing having the sealing material according to any one of claims 1 to 10, which surrounds the outer periphery of the spacer and seals the space formed by the spacer and the two glass plates. The double glazing according to claim 11, wherein one of the two glass plates is fireproof glass and the other is Low-E glass. The double glazing according to claim 11 or 12, further comprising a second sealing material having a composition different from that of the sealing material between the spacer and the two glass plates.

Images