JP7335611B2 - Spacer member and double glazing - Google Patents

Description

The present invention relates to a spacer member and double glazing.

Double glazing is constructed by arranging a spacer member on the outer peripheral edge portion between the facing surfaces of two glass plates and sealing the outer peripheral portion of the spacer member with a sealing material. Conventionally, spacer members made of aluminum have been widely used because they are easy to mold and inexpensive.

On the other hand, in recent years, there has been a demand for multi-layer glass having various shapes and sizes. Therefore, the use of resin spacer members is increasing because they can be easily adapted to various shapes and sizes.

Double glazing is usually fixed by fitting its upper and lower portions into mounting recesses provided in a building. The spacer member made of resin is vulnerable to heat in the event of a fire, and falls off from between the facing surfaces of the two glass plates in the event of a fire, destroying the arrangement of the two glass plates in the mounting recess. As a result, a gap is created between the facing surfaces of the two glass plates that make up the double glazing and the mounting recess of the building, and flames enter through this gap, causing the fire to spread and the fire resistance to be low. have.

Therefore, Patent Document 1 discloses a multi-layer glass in which a plurality of glass plates are arranged facing each other at a predetermined interval via a spacer placed on the peripheral edge of the glass plate, wherein the spacer is an aromatic vinyl A rubbery spacer containing an isobutylene-based block copolymer (A) comprising a polymer block (a) having a compound as a constituent monomer and a polymer block (b) having isobutylene as a constituent monomer. The spacer and the glass plate are bonded via an adhesive layer, and the adhesive layer contains an isobutylene-based polymer (B) having an alkenyl group at its terminal and a compound having at least two hydrosilyl groups in the molecule. A double glazing made of an adhesive composition containing (C) has been proposed.

JP 2007-308350 A

However, the fire resistance of rubber spacers is insufficient, and a spacer member having excellent fire resistance is desired.

The present invention provides a spacer member capable of maintaining the arrangement state of two glass plates constituting double glazing despite the heat generated in the event of a fire, and generally preventing the spread of fire in the event of a fire. To provide double glazing using

The spacer member of the present invention is a spacer member that is used by being disposed between two glass plates constituting double glazing, and has a maximum strength of 20 N/mm ² or more in a normal state before combustion, and It is characterized by having a maximum strength of 5 N/mm ² or more after burning at 600° C. for 30 minutes.

A double glazing is constructed by fixing two glass plates facing each other with a predetermined gap therebetween via a spacer member. Specifically, two glass plates are disposed facing each other, and a spacer member is interposed over the entire outer periphery of the opposing surfaces of the two glass plates. The glass sheets are maintained at a predetermined interval by a spacer member to form double glazing.

Since the spacer member has a maximum strength of 20 N/mm ² or more in a normal state before combustion, the two glass plates constituting the double glazing are firmly bonded and integrated via the spacer member. It is possible to stably hold the glass sheets with a predetermined interval. Therefore, it is possible to fix the multi-layer glass having a predetermined thickness in a state in which it is arranged without gaps in the recess for mounting the multi-layer glass formed in the building. The spacer member preferably has a maximum strength of 150 N/mm ² or less in a normal state before combustion.

The normal maximum strength before combustion of the spacer member is a value measured in the following manner. First, a rectangular parallelepiped spacer member having a length of 50 mm, a width of 10 mm, and a height of 10 mm is produced at 23° C., and the spacer member is used as a test piece.

Next, two glass plates each having a square shape with a side of 10 mm and a thickness of 10 mm are prepared. Two glass plates are superimposed so that they are completely aligned when viewed from the thickness direction, and the test piece is interposed in the center between the opposing surfaces of the two glass plates to produce a laminate. In addition, the height direction of the test piece and the thickness direction of the glass plate are adjusted to match each other.

After heating the laminate to an ambient temperature of 200° C., it is left at 23° C. for 3 hours to bond and integrate the test piece and the glass plate to prepare an H-shaped test piece.

A tensile test is performed by holding a glass plate under conditions of 23 ° C. and a speed of 50 mm / min in accordance with NPO Housing Exterior Wall Technical Center Standard JTC S-0001 to measure the maximum strength of the H-shaped test piece. The maximum strength is defined as the normal maximum strength of the spacer member before combustion.

The spacer member has a maximum strength of 5 N/mm ² or more after burning at 600° C. for 30 minutes. The spacer member generates combustion residue due to heat generated during a fire, and the maximum strength of this combustion residue is 5 N/mm ² or more. The spacer member preferably has a maximum strength of 70 N/mm ² or less after burning at 600° C. for 30 minutes.

The double glazing is used by fixing the ends thereof by fitting them into mounting recesses of the building. Since the spacer member has a maximum strength of 5 N/mm ² or more after burning at 600° C. for 30 minutes, the glass plate at the end of the double glazing that is fitted in the mounting recess of the building in the event of a fire. The distance between them is maintained stably. Therefore, in the event of a fire, it is possible to prevent the formation of a gap between the mounting recess of the double glazing formed in the building and the end of the double glazing facing the mounting recess, and the gap caused by the gap is prevented. It is possible to effectively prevent the spread of fire.

Regarding the spacer member, the maximum strength after burning at 600° C. for 30 minutes refers to the value measured in the following manner. First, an H-shaped test piece is prepared in the same manner as in measuring the maximum strength of the spacer member described above.

After that, the H-type test piece was left in a constant temperature bath at 600 ° C. for 30 minutes to burn, then removed from the constant temperature bath, left in an atmosphere of 23 ° C. and a relative humidity of 50% for 3 hours. A test piece (combustion residue) is prepared.

A tensile test was performed by holding a glass plate under conditions of 23 ° C. and a speed of 50 mm / min in accordance with NPO Housing Exterior Wall Technical Center Standard JTC S-0001, H-shaped test piece after combustion (combustion residue) Measure the maximum intensity of

A spacer member containing an isobutylene-based polymer and a glass frit will be described below.

[Isobutylene polymer]
The isobutylene-based polymer may contain isobutylene as a monomer unit, but since the water vapor permeability of the spacer member can be suppressed, it preferably contains 50% by mass or more of the isobutylene unit. It is more preferably contained in an amount of 70% by mass or more, more preferably 90% by mass or more, and more preferably 100% by mass.

The isobutylene-based polymer is not particularly limited, and examples include polyisobutylene, butyl rubber, brominated butyl rubber, chlorinated butyl rubber, isobutylene-isoprene copolymer, styrene-isobutylene copolymer, and isobutylene-p-methylstyrene copolymer. , and styrene-isobutylene-styrene block copolymers. The isobutylene-based polymer may be used alone or in combination of two or more.

As the isobutylene-based polymer, polyisobutylene, butyl rubber, isobutylene-isoprene copolymer, styrene-isobutylene copolymer, and isobutylene-based block copolymer are preferable because they can suppress the moisture permeability of the spacer member. is more preferred.

When the isobutylene-based polymer is solid at room temperature (23° C.), the viscosity of the isobutylene-based polymer at 150° C. is preferably 150,000 to 1,000,000 mPa·s, more preferably 250,000 to 1,000,000 mPa·s. 450,000 to 800,000 mPa·s is more preferable. When the isobutylene-based polymer has a viscosity of 150,000 mPa·s or more at 150° C., the adhesive strength between the spacer member and the glass plate is improved, and the maximum strength of the spacer member in the normal state and of the combustion residue is improved. It is preferable that the viscosity of the isobutylene-based polymer at 150° C. is 1,000,000 mPa·s or less, since dripping during application can be prevented. The viscosity of the isobutylene-based polymer at 150° C. is a value measured using a Brookfield RVT viscometer (spindle No. 27) at a rotation speed of 10 rpm.

When the isobutylene polymer is liquid at room temperature (23°C), the viscosity of the isobutylene polymer at 23°C is preferably 10,000 to 800,000 mPa·s, more preferably 30,000 to 600,000 mPa·s. 50,000 to 400,000 mPa·s is more preferable. When the isobutylene-based polymer has a viscosity of 10,000 mPa·s or more at 23° C., the adhesion strength between the spacer member and the glass plate is improved. It is preferable that the viscosity of the isobutylene-based polymer at 23° C. is 800,000 mPa·s or less, because sagging during construction can be prevented. The viscosity of the isobutylene-based polymer at 23° C. is a value measured using a Brookfield RVT viscometer (spindle No. 27) at a rotation speed of 10 rpm.

The weight average molecular weight of the isobutylene polymer is preferably 5,000 or more, more preferably 10,000 or more. The weight average molecular weight of the isobutylene polymer is preferably 50,000 or less, more preferably 30,000 or less. When the weight average molecular weight of the isobutylene-based polymer is within the above range, the adhesiveness between the spacer member and the glass plate is improved, and the maximum strength of the spacer member in a normal state before combustion and the maximum strength of the combustion residue are improved. .

The number average molecular weight of the isobutylene-based polymer is a value converted from polystyrene using a gel permeation chromatography (GPC) method. For example, it can be measured using the following measuring apparatus and measuring conditions.

<Measuring device>
Product name “Waters 2690” manufactured by Waters
<Measurement conditions>
Column: Shodex GPC KF800D
(4.6 mm ID250 mm) x 2 Column temperature: 40°C
Mobile phase: tetrahydrofuran (0.3 mL/min)
Sample concentration: 0.2% by mass
Detector: Product name “2414” manufactured by RI WATERS

A commercially available isobutylene polymer can be used. For example, isobutylene-based polymers are available from EXXON under the trade names of "Vistanex LM-MS", "Vistanex LM-MH", "Vistanex LM-H", "Vistanex MML-80", and "Vistanex MML-". 100", "Vistanex MML-120" and "Vistanex MML-140", trade names "Tetrax 3T", "Tetrax 4T", "Tetrax 5T" and "Tetrax 6T" from Nippon Oil Corporation, "Polybutene (HV) Himol 4H", "Polybutene (HV) Himol 5H" and "Polybutene (HV) Himol 6H", and trade names "OPPANOL B10", "OPPANOL B12", "OPPANOL B15" from BASF. , OPPANOL B50, OPPANOL B80, OPPANOL B100, OPPANOL B120, OPPANOL B150 and OPPANOL B220.

The isobutylene-based polymer may contain a hydrolyzable silyl group. When the isobutylene-based polymer contains a hydrolyzable silyl group, the elastic recovery property of the cured spacer member is improved, and the dimensional change between the glass plates is improved.

A hydrolyzable silyl group is a group in which 1 to 3 hydrolyzable groups are bonded to a silicon atom.

The hydrolyzable group of the hydrolyzable silyl group is not particularly limited. groups, alkenyloxy groups, and the like.

Among them, as the hydrolyzable silyl group, an alkoxysilyl group is preferable because the hydrolysis reaction is mild. Alkoxysilyl groups include trialkoxysilyl groups such as trimethoxysilyl group, triethoxysilyl group, triisopropoxysilyl group, and triphenoxysilyl group; propyldimethoxysilyl group, methyldimethoxysilyl group, and methyldiethoxysilyl group; and monoalkoxysilyl groups such as dimethylmethoxysilyl and dimethylethoxysilyl groups. Among them, a trialkoxysilyl group is more preferable, and a trimethoxysilyl group is particularly preferable.

The isobutylene-based polymer preferably has one or more hydrolyzable silyl groups on average per molecule, and preferably has 1.5 or more hydrolyzable silyl groups. More preferably, it has 1.8 or more hydrolyzable silyl groups. When the spacer member has one or more hydrolyzable silyl groups, the elastic recovery property of the cured product of the spacer member is improved, and the followability to the dimensional change between the glass plates is improved.

The isobutylene-based polymer preferably has an average of 3 or less hydrolyzable silyl groups in one molecule, and preferably has 2.8 or less hydrolyzable silyl groups. More preferably, it has 2.5 or less hydrolyzable silyl groups. Having 3 or less hydrolyzable silyl groups is preferable because the restoration properties of the cured product of the spacer member can be improved.

Since it is possible to provide a spacer member capable of forming a cured product having excellent rubber elasticity, the isobutylene-based polymer has a hydrolyzable silyl group at least one of both ends of its molecular chain. preferably.

The average number of hydrolyzable silyl groups per molecule in the isobutylene polymer is the concentration of hydrolyzable silyl groups in the isobutylene polymer determined by 1H-NMR, and isobutylene determined by the GPC method. It can be calculated based on the number average molecular weight of the system polymer.

A commercially available isobutylene polymer containing a hydrolyzable silyl group in the molecule can be used. Isobutylene polymers containing hydrolyzable silyl groups in the molecule are commercially available from Kaneka under the trade names of "Epion EP103S", "Epion EP303S" and "Epion EP505S".

[Glass frit]
The spacer member contains glass frit. Examples of the glass constituting the glass frit include phosphate glass, borate glass, bismuth oxide glass, silicate glass, sodium oxide glass, and the like. is preferred, and phosphate glass is more preferred. These glass frits are _{B2O3 , P2O5} , ZnO, SiO2, _{Bi2O3 , Al2O3 , BaO} , _CaO , _MgO , _MnO2 , _ZrO2 , _TiO2 , _CeO2 , SrO , V ₂ O ₅ , SnO ₂ , Li ₂ O, Na ₂ O, K ₂ O, CuO, Fe ₂ O ₃ and the like can be adjusted at predetermined component ratios. The glass frit may be used alone or in combination of two or more.

The softening point of the glass constituting the glass frit is preferably 350 to 650°C, more preferably 360 to 560°C, particularly preferably 370 to 540°C, most preferably 380 to 520°C. When the softening point of the glass forming the glass frit is within the above range, the spacer member has excellent maximum strength. Therefore, at the edges of the double glazing, the distance between the glass sheets is stably maintained, and in the event of a fire, the gap between the mounting recess of the double glazing in the building and the opposite edge of the double glazing is maintained. It is possible to prevent the gap from being generated and to effectively prevent the spread of fire caused by the gap. The softening point of the glass forming the glass frit is the temperature at which the viscosity of the glass becomes 107.6 dPa·s (log η=7.6).

The content of the glass frit in the spacer member is preferably 2 to 300 parts by mass, more preferably 5 to 200 parts by mass, more preferably 20 to 150 parts by mass, and 50 to 110 parts by mass with respect to 100 parts by mass of the isobutylene polymer. Parts by mass are more preferred. When the glass frit content is within the above range, the spacer member and its combustion residue have excellent maximum strength. Therefore, at the edges of the double glazing, the distance between the glass sheets is stably maintained, and in the event of a fire, the gap between the mounting recess of the double glazing in the building and the opposite edge of the double glazing is maintained. It is possible to prevent the gap from being generated and to effectively prevent the spread of fire caused by the gap.

Since the spacer member contains the glass frit, the spacer member has low moisture permeability and generally suppresses the entry of moisture into the space surrounded by the two glass plates and the spacer member. It is possible to substantially prevent condensation from occurring in the

[mineral]
The spacer member preferably contains a mineral having a Mohs hardness of 5 or more. If the spacer member contains a mineral having a Mohs hardness of 5 or more, the combustion residue of the spacer member has even better maximum strength. Therefore, at the edges of the double glazing, the distance between the glass sheets is stably maintained, and in the event of a fire, the gap between the mounting recess of the double glazing in the building and the opposite edge of the double glazing is maintained. It is possible to prevent the gap from being generated and to effectively prevent the spread of fire caused by the gap.

Examples of minerals having a Mohs hardness of 5 or more include feldspars, iron oxide, titanium oxide, silica (SiO ₂ ), quartz, α-alumina, silicon carbide, and boron carbide. α-alumina is preferred, feldspars and α-alumina are more preferred, and feldspars are particularly preferred.

The Mohs hardness of minerals is measured as follows. Ten types of standard minerals with different hardness [standard minerals with a Mohs hardness of 1 to 10 (integer)] are prepared. Rub standard minerals with low Mohs hardness on the surface of the mineral to be measured. The Mohs hardness of the standard mineral having the highest Mohs hardness among the standard minerals of which the surface of the mineral to be measured was not scratched is defined as the Mohs hardness of the mineral.

Feldspars include feldspar and quasi-feldspar, preferably quasi-feldspar. The feldspars may be used singly or in combination of two or more.

Examples of feldspar include alkali feldspar such as orthoclase, sanidine, microcline feldspar and anosclase; be done.

Examples of quasi-feldspar include nepheline such as calcilite and cancrinite, nepheline syenite, leucite, and soda. Examples include sodalite, auin, lazurite, nosean, and melilite, with nepheline syenite being preferred. Nepheline syenite is sometimes described as syenite.

The mineral has an average particle size of 0.01 to 100 μm, preferably 0.1 to 50 μm, more preferably 1 to 25 μm, particularly preferably 2 to 15 μm, particularly preferably 3 to 10 μm. When the average particle size of the mineral is 0.01 μm or more, the combustion residue of the spacer member has even better maximum strength. Therefore, at the edges of the double glazing, the distance between the glass sheets is stably maintained, and in the event of a fire, the gap between the mounting recess of the double glazing in the building and the opposite edge of the double glazing is maintained. It is possible to prevent the gap from being generated and to effectively prevent the spread of fire caused by the gap. When the average particle size of the mineral is 100 μm or less, the mineral can be uniformly dispersed in the spacer member, and the combustion residue of the spacer member has even better maximum strength. Therefore, at the edges of the double glazing, the distance between the glass sheets is stably maintained, and in the event of a fire, the gap between the mounting recess of the double glazing in the building and the opposite edge of the double glazing is maintained. It is possible to prevent the gap from being generated and to effectively prevent the spread of fire caused by the gap.

The average particle size of minerals is a value measured by image analysis using a transmission electron microscope. Specifically, a 100-fold enlarged photograph of minerals is taken using a transmission electron microscope, 50 arbitrary minerals are extracted, the diameter of each mineral is measured, and the arithmetic mean of the diameter of each mineral Let the value be the average particle size of the mineral. The diameter of a mineral refers to the diameter of the smallest perfect circle that can surround the mineral.

The mineral content in the spacer member is preferably 1 to 800 parts by mass, preferably 30 to 600 parts by mass, more preferably 35 to 450 parts by mass, and 40 to 300 parts by mass with respect to 100 parts by mass of the isobutylene polymer. is more preferable, 45 to 200 parts by mass is more preferable, and 46 to 150 parts by mass is particularly preferable. When the mineral content is within the above range, the combustion residue of the spacer member has even better maximum strength. Therefore, at the edges of the double glazing, the distance between the glass sheets is stably maintained, and in the event of a fire, the gap between the mounting recess of the double glazing in the building and the opposite edge of the double glazing is maintained. It is possible to prevent the gap from being generated and to effectively prevent the spread of fire caused by the gap.

In the spacer member, the ratio of the mineral content to the glass frit content (mineral content/glass frit content) is preferably 1 to 20, more preferably 2 to 15, and 2.5 to 12. is more preferred, 3 to 10 is particularly preferred, and 3.5 to 7 is most preferred. When the ratio of the mineral content to the glass frit content (mineral content/glass frit content) is within the above range, the combustion residue of the spacer member has even better maximum strength. Therefore, at the edges of the double glazing, the distance between the glass sheets is stably maintained, and in the event of a fire, the gap between the mounting recess of the double glazing in the building and the opposite edge of the double glazing is maintained. It is possible to prevent the gap from being generated and to effectively prevent the spread of fire caused by the gap.

[Additive]
The spacer member contains an inorganic filler, a moisture absorbent (e.g., zeolite, etc.), an antioxidant, an ultraviolet absorber, a light stabilizer, a pigment, a surfactant, a flame retardant, and a silane coupling agent, as long as the physical properties of the spacer member are not impaired. , an antiblocking agent, an antistatic agent, a coloring agent, an antibacterial agent, a lubricant, and the like.

The inorganic filler is not particularly limited, and examples thereof include calcium carbonate (e.g., colloidal calcium carbonate, ground calcium carbonate, light calcium carbonate, etc.), magnesium carbonate, calcium oxide, hydrous silicic acid, anhydrous silicic acid, and finely divided silica. , calcium silicate, titanium dioxide, clay, talc, carbon black, and glass balloons. Calcium carbonate is preferred, and heavy calcium carbonate is more preferred. The inorganic fillers may be used alone or in combination of two or more.

The average particle size of calcium carbonate is preferably 0.01 to 10 μm, more preferably 0.1 to 7 μm. With calcium carbonate having such an average particle size, the spacer member has improved adhesiveness between the spacer member and the glass plate, and further has maximum strength in the normal state before combustion of the spacer member and reduction of combustion residue. Increases maximum strength. The average particle size of calcium carbonate refers to a value obtained by averaging 10 particles measured on a scale by SEM observation.

Moreover, calcium carbonate is preferably surface-treated with a fatty acid, a fatty acid ester, or the like. Calcium carbonate that has been surface treated with fatty acids, fatty acid esters, etc., can be evenly dispersed in the spacer member and the spacer member has a better maximum strength.

Examples of the ultraviolet absorber include benzotriazole-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, and the like, and benzotriazole-based ultraviolet absorbers are preferred. The content of the ultraviolet absorber in the spacer member is preferably 0.1 to 20 parts by mass, more preferably 0.1 to 10 parts by mass, based on 100 parts by mass of the isobutylene polymer.

Examples of antioxidants include hindered phenol-based antioxidants, monophenol-based antioxidants, bisphenol-based antioxidants, and polyphenol-based antioxidants, with hindered phenol-based antioxidants being preferred. be done. The content of the antioxidant in the spacer member is preferably 0.1 to 20 parts by mass, more preferably 0.3 to 10 parts by mass, per 100 parts by mass of the isobutylene polymer.

[Light stabilizer]
The spacer member preferably contains a hindered amine light stabilizer. A hindered amine light stabilizer can provide a spacer member capable of maintaining excellent maximum strength for a longer period of time.

Hindered amine light stabilizers include, for example, a mixture of bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and methyl 1,2,2,6,6-pentamethyl-4-piperidyl sebacate , bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, dibutylamine/1,3,5-triazine/N,N'-bis(2,2,6,6-tetramethyl-4 - polycondensation product of piperidyl-1,6-hexamethylenediamine and N-(2,2,6,6-tetramethyl-4-piperidyl)butylamine, poly[{6-(1,1,3,3- tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl}{(2,2,6,6-tetramethyl-4-piperidyl)imino}hexamethylene {(2,2,6,6 -tetramethyl-4-piperidyl)imino}], polycondensates of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol, and the like.

Preferred examples of the hindered amine light stabilizer include NOR type hindered amine light stabilizers. According to the NOR-type hindered amine light stabilizer, it is possible to provide a spacer member in which the decrease in maximum strength over time is suppressed.

A NOR-type hindered amine light stabilizer has a NOR structure in which an alkyl group (R) is bonded via an oxygen atom (O) to a nitrogen atom (N) contained in a piperidine ring skeleton. The number of carbon atoms in the alkyl group in the NOR structure is preferably 1-20, more preferably 1-18, and particularly preferably 18. Alkyl groups include straight-chain alkyl groups, branched-chain alkyl groups, and cyclic alkyl groups (saturated alicyclic hydrocarbon groups).

Linear alkyl groups include, for example, methyl group, ethyl group, n-propyl group, n-butyl group, n-pentyl group, n-hexyl group, n-octyl group, n-nonyl group and n-decyl. and the like. Branched chain alkyl groups include, for example, isopropyl, isobutyl, sec-butyl, tert-butyl and the like. Cyclic alkyl groups (saturated alicyclic hydrocarbon groups) include, for example, a cyclopentyl group, a cyclohexyl group, and a cyclooctyl group. Further, hydrogen atoms constituting the alkyl group may be substituted with halogen atoms (eg, fluorine atom, chlorine atom, bromine atom, etc.) or hydroxyl groups.

Examples of the NOR-type hindered amine light stabilizer include hindered amine light stabilizers represented by the following formula (I).

When using a NOR-type hindered amine light stabilizer, it is preferable to use a combination of the NOR-type hindered amine light stabilizer and a benzotriazole-based ultraviolet absorber or triazine-based ultraviolet absorber. As a result, it is possible to provide a spacer member in which a decrease in maximum strength over time is suppressed to a greater extent.

The content of the hindered amine light stabilizer in the spacer member is preferably 0.01 to 20 parts by mass, more preferably 0.1 to 10 parts by mass, based on 100 parts by mass of the isobutylene polymer.

The spacer member can be produced by mixing an isobutylene-based polymer, glass frit, minerals and additives that are contained as necessary, in a state where the isobutylene-based polymer is molten, by a general-purpose method. .

A double glazing can be manufactured using a spacer member. If the spacer member is solid in its normal state, it is made into a paste that can be deformed by heating. When the spacer member is liquid under normal conditions, it may be heated as necessary for viscosity adjustment. After that, a spacer member is applied or arranged on the outer peripheral edge of one of the two glass plates using a known means such as a hot-melt coater. In addition, it is preferable to apply the spacer member in the form of a bead on the glass plate.

Thereafter, the other glass plate is overlaid on the coating surface of the spacer member on one glass plate to produce a laminate.

When the spacer member is heated to form a paste, the laminate is pressed in the direction in which the glass plates are laminated while being heated as necessary, and then the laminate is cooled to solidify the spacer member. A double glazing can be manufactured by bonding and integrating the spacer member and the glass plate. When the spacer member is curable, the spacer member may be cured during cooling of the laminate or before and after cooling.

When the spacer member is in a liquid state in a normal state, the spacer member is solidified by curing, and the double glazing can be manufactured by bonding the spacer member and the glass plate together.

Since the spacer member contains an isobutylene-based polymer, it exhibits excellent adhesiveness even to a glass plate having a smooth surface with extremely few irregularities, and the two glass plates are attached via the spacer member. strongly integrated. Furthermore, since the spacer member has an excellent maximum strength at room temperature, it can stably hold the two glass sheets with a predetermined gap therebetween, and the double glazing can be installed in a building. It can be stably arranged and fixed over a long period of time without creating a gap between the mounting recess and the mounting recess.

In addition, since the spacer member has low moisture permeability, it is possible to effectively suppress the ingress of moisture into the space surrounded by the two glass plates and the spacer member, thereby preventing unforeseen problems such as condensation on the double glazing. situation can be prevented from occurring.

In addition, since the spacer member maintains the maximum strength of the combustion residue that is excellent even after combustion, the two glass plates in the part where the spacer member is interposed will not be damaged during and after the combustion of the fire. are stably arranged with a predetermined interval, and there is no gap between the recess for mounting the double glazing in the building and the double glazing facing it, and the double glazing It is possible to substantially prevent the spread of fire caused by the mounting recess.

Moreover, since the spacer member contains glass frit, the glass frit is melted by the heat generated in the event of a fire, thereby further strengthening the adhesion between the spacer member and the glass plate. Therefore, even after a fire, the two glass plates are stably arranged with a predetermined gap, and the gap between the mounting recess of the double glazing in the building and the double glazing facing it is sufficient. Therefore, it is possible to prevent the spread of fire caused by the mounting recess of the multi-layer glass.

The spacer member of the present invention has excellent adhesion to glass plates both before and after burning, and has excellent maximum strength. It can be stably fixed. Therefore, the multi-layered glass constructed using the spacer member reliably maintains the state in which the two glass sheets have a predetermined gap despite the heat generated by the fire. Therefore, even in the event of a fire, there will be no gap between the recessed portion for installing the double glazing in the building and the opposing double glazing, and the Spread of fire can be largely prevented.

EXAMPLES The present invention will be described in more detail below using examples, but the present invention is not limited to these.

The following raw materials were used in the production of the spacer members of Examples and Comparative Examples.

[Isobutylene polymer]
- Polyisobutylene A (viscosity at 150 ° C.: 700000 mPa s, trade name "OPPANOL B15N" manufactured by BASF, weight average molecular weight: 85000, no hydrolyzable silyl group, solid at 23 ° C.)
- Polyisobutylene B (viscosity at 150 ° C.: 250000 mPa s, trade name "OPPANOL B13N" manufactured by BASF, weight average molecular weight: 65000, no hydrolyzable silyl group, solid at 23 ° C.)
・Polyisobutylene C (viscosity at 23° C.: 160000 mPa s, product name “Epion EP303S” manufactured by Kaneka, weight average molecular weight: 10000, hydrolyzable silyl group having a trimethoxysilyl group, hydrolyzable silyl group 1 Average number in molecule: 1, liquid at 23°C)

[Glass frit]
-Glass frit A (phosphate glass, "VY0144" manufactured _by Nihon Frit Co., Ltd., main components: _P2O5 , _Al2O3 and _R2O , R is an alkali metal atom, softening _point : 404°C)
-Glass frit B (boric acid glass, "CY0086" manufactured by Nihon Frit Co., Ltd., main components: _B2O3 , _ZnO and RO, R is an alkaline earth metal atom, softening point: 569 ° C.)

[mineral]
・ Feldspar (nepheline cyanite, average particle size: 5 μm, trade name “Nesper” manufactured by Shiraishi Calcium Co., Ltd., Mohs hardness: 6)

[Filling material]
・ Heavy calcium carbonate (trade name “P-30” manufactured by Shiraishi Calcium Co., Ltd., average particle size: 5 μm)

[Moisture absorbent]
・ Zeolite (trade name “Zeoram A-3” manufactured by Tosoh Corporation)

[Antioxidant]
・ Hindered phenol antioxidant (product name “Irganox 1010” manufactured by BASF Japan)

(Examples 1 to 6 and Comparative Examples 1 to 5)
Polyisobutylene, glass frit, feldspar, ground calcium carbonate, zeolite and hindered phenolic antioxidant were blended in the amounts shown in Table 1 using a kneader at 150°C for 60 minutes until uniform. A spacer member was produced by mixing.

(Example 7)
Polyisobutylene, glass frit, feldspar, ground calcium carbonate, zeolite and hindered phenolic antioxidant were blended in the amounts shown in Table 1 using a kneader at 23°C for 60 minutes until uniform. A spacer member was produced by mixing.

For the spacer members of Examples 1 to 6 and Comparative Examples 1 to 5, the spacer members were heated to 150° C. to be liquefied, and then filled into a polyethylene mold so that air bubbles would not enter. After that, the spacer member was aged for 7 days in an atmosphere of 23° C. and 50% relative humidity to prepare a flat rectangular test piece having a thickness of 3 mm.

Regarding the spacer member of Example 7, the spacer member was held at 23° C. and filled in the mold. After that, the spacer member was aged for 7 days in an atmosphere of 23° C. and 50% relative humidity to harden the spacer member and prepare a flat rectangular test piece having a thickness of 3 mm.

A No. 3 dumbbell was punched out from a test piece obtained according to JIS K6251. A pair of straight lines parallel to each other was drawn on the surface of a No. 3 dumbbell. The distance L ₀ between the pair of marked lines was mm. Next, the No. 3 dumbbell was extended so that the distance L ₀ between the marked lines was doubled. The No. 3 dumbbell was held at 23° C. for 24 hours while maintaining this stretched state. After that, the stretching force was removed from the No. 3 dumbbell and the No. 3 dumbbell was left at 23° C. for 1 hour. A distance L ₁ between a pair of marked lines drawn on the surface of the No. 3 dumbbell was measured. The restorability (%) was calculated based on the following formula.
Restorability (%) = 100 - 100 x (L ₁ - L ₀ )/L ₀

The maximum strength of the obtained spacer member in the normal state before combustion and the maximum strength after 30 minutes of combustion at 600° C. (maximum strength of combustion residue) were measured in the manner described above.

The moisture permeability of the obtained spacer member was measured according to JIS Z 0208 moisture permeability test for moisture-proof materials (cup method), and the results are shown in Table 1.

Claims (5)

A spacer member that is used by being arranged between two glass plates constituting double glazing, having a maximum strength of 20 N/mm ² or more in a normal state before burning, and after burning at 600°C for 30 minutes. A spacer member characterized by having a maximum strength of 5 N/mm ² or more and containing an isobutylene-based polymer and glass frit. 2. The spacer member according to claim 1, wherein the isobutylene polymer contains a hydrolyzable silyl group. 3. The spacer member according to claim 2, wherein the spacer member contains a mineral having a Mohs hardness of 5 or more. 4. The spacer member according to claim 3, wherein the mineral having a Mohs hardness of 5 or more includes feldspars. two opposing glass plates;
and a spacer member disposed between the opposing surfaces of the glass plates,
The spacer member has a maximum strength of 20 N/mm ² or more in a normal state before burning and a maximum strength of 5 N/mm ² or more after burning at 600° C. for 30 minutes, and contains an isobutylene-based polymer and glass frit. A multi-layered glass characterized by: