JPH0891881A - Multiple glass - Google Patents

Abstract

PURPOSE: To provide a method for producing a multiple glass high in productivity, free from cracking, peeling and a deviation, etc., of a multiple glass plates by using a specified hot-melt sealant as a sealing material at a space retaining part of two sheets of glass plates facing to each other. CONSTITUTION: For example, zeolite 3A is filled as a drying agent in a hollow part of a hollow square cylindrical aluminum-made spacer 1 having 5.5mm square, and a small amount of butyl rubber 3 for the primary seal of a multiple glass is intervened at upper and lower of this spacer 1, and two sheets of glass plate 4 and 4' are laminated at there area to obtain an intermediate body A. An outer peripheral part of the intermediate body A is sealed with a hot-melt butyl based sealant 5 for the secondary seal having >=0.5kgf/cm<2> max. tensile stress at 60 deg.C test temp. and <=35kgf/cm<2> at -20 deg.C by a tensile adhesion test specified to JIS A5758 by using a hot-melt applicator to obtain a multiple glass B having a hot-melt butyl based sealant 5 for the secondary seal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to double glazing.

[0002]

2. Description of the Related Art In the conventional double-glazing, two glass plates are made to face each other through a metal (mainly aluminum) spacer or a resin spacer, and a peripheral portion thereof is coated with a reactive adhesive or sealant. By bonding, practical strength such as shape retention and glass interval retention is exhibited. As a sealant for the outer peripheral portion, a polysulfide-based or silicone-based two-component mixed sealant is mainly used. In the actual assembly and production of double glazing,
After curing, it takes a considerable time to develop practical strength, and there are various problems such as a long delivery time and poor handling when uncured.

In recent years, in order to solve these problems, hot-melt adhesives which can exhibit initial physical properties immediately after cooling have been studied, and gradually started to be used. However, the adhesive has a strong temperature dependence of the adhesive properties, and especially at low temperatures, it lacks elasticity due to embrittlement or hardness increase, and at high temperatures it lacks material strength due to softening, etc. , When the temperature is high, peeling of the glass plate due to the stress caused by the internal pressure rise in the air layer, the deviation of the laminated glass plate, and at the time of low temperature, the crack and peeling of the glass plate due to the stress caused by the decrease of the internal pressure of the air layer , The deviation of the double-layered glass plate occurs, and the life of the double-layer glass using them is shorter than that of the double-layer glass using the above-mentioned curable sealant, which is insufficient as an actual product. there were.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the various problems mentioned in the above-mentioned prior art and to provide a double glazing which enables a manufacturing method with high productivity.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems.
A maximum tensile stress of 0.5 kgf / cm ² or more when the tensile adhesion test defined by A 5758 (using a glass plate as an adherend) is performed at a test temperature of 60 ° C., and the test is -20 Maximum tensile stress is 35kg when performed at ℃
The present invention provides a double glazing characterized by using a hot melt type sealant of f / cm ² or less as a sealing material for a space holding portion between two glass plates facing each other.

The double glazing to which the present invention is applied includes
Not only the one using a metal spacer as the space keeping means for the two glass plates, but also one using a resin spacer is included. As the sealant of the present invention, that is, an adhesive, among the hot-melt type sealants, those having a moisture-proof property are desirable, and butyl rubber type hot-melt type sealants are particularly desirable.

[0007]

EXAMPLES Examples and comparative examples of the present invention will be described below, but the present invention is not limited thereto.

[Example 1] As shown in FIG.
Zeolite 3A as a desiccant 2 is filled in the hollow portion of a square square aluminum spacer 1 of m square shape, and a small amount of butyl rubber 3 for double-layer glass primary sealing is placed above and below the spacer 1 to form two glass sheets. Plates 4, 4 (350 mm
× 500 mm, thickness 3 mm) were laminated on the top and bottom to obtain an intermediate A. Next, the outer peripheral portion of the intermediate A is
A maximum tensile stress is 1.0 kgf / when the tensile adhesion test specified by A 5758 is performed at a test temperature of 60 ° C.
cm, maximum tensile stress is 30k when performed at -20 ° C
The hot-melt butyl sealant A for secondary sealing having a gf / cm ² was sealed using a hot-melt applicator to obtain a double glazing A having a hot-melt sealant 5 for secondary sealing as shown in FIG. . The present multilayer glass A had practical strength after cooling the hot melt butyl-based sealant immediately after being laminated, and after 2 hours, the dew point of its air layer portion was -60 ° C or lower. Also, 6
The dew point of the air layer was −60 ° C. or lower even after 200 days of storage in a thermo-hygrostat at 0 ° C. and 95% relative humidity. Further, when a cold heat repeating test specified in JIS R 3109 III was conducted on the present double glazing A, the dew point of the air layer thereof was −60 ° C. after the test.

[Example 2] An intermediate A was prepared in the same manner as in Example 1, and then the outer peripheral portion of the intermediate A was subjected to a tensile adhesion test specified by JIS A 5758 at a test temperature of 60 ° C. maximum tensile strength is 0.5 kgf / cm ^2, the maximum tensile stress the seal to hot melt system for a secondary seal with a hot-melt butyl-based sealant B was 35 kgf / cm ² in the case of performing at -20 ° C. A multi-layer glass B having the sealant 5 as shown in FIG. 2 was obtained. The present multilayer glass B had practical strength after cooling the hot-melt butyl-based sealant immediately after being laminated, and after 2 hours, the dew point of the air layer portion thereof was −60 ° C. or lower. Also, 60 ℃,
The dew point of the air layer was −60 ° C. or lower even after being stored for 200 days in a thermo-hygrostat having a relative humidity of 95%. Further, when the double glazing B was subjected to a cold heat repeating test defined in JIS R 3209 III, the dew point of the air layer thereof was maintained at -60 ° C after the test.

Example 3 30 parts of polyisobutylene, 20 parts of partially vulcanized butyl rubber, 10 parts of tackifier, 20 parts of inorganic additive, 20 parts of desiccant consisting of powdered zeolite 3A were mixed with a roll kneader. Kneading at 140 ° C, then
A resin spacer 6 containing a desiccant having a rectangular shape of 6 mm square was prepared by using an extruder dedicated to rubber. Next, using this resin spacer 6 and the hot melt type sealant B used in Example 2, a resin spacer type double glazing C having a cross section as shown in FIG. 3 was prepared. The present multilayer glass C had practical strength after cooling the hot melt butyl-based sealant immediately after being laminated, and after 1 day, the dew point of the air layer portion thereof was −35 ° C. or lower. Also, 60 ° C, 9
The dew point of the air layer was −60 ° C. or lower even after 200 days of storage in a thermo-hygrostat having a relative humidity of 5%. Furthermore, 20 after creation
After a lapse of days, the double-layer glass C having an air layer dew point of −60 ° C. was subjected to a cold heat repeated test specified in JIS R 3209 III, and the dew point of the air layer was − The temperature was maintained at 60 ° C.

[Comparative Example 1] An intermediate A was prepared in the same manner as in Example 1, and then the outer peripheral portion of the intermediate A was subjected to a tensile adhesion test specified by JIS A 5758 at a test temperature of 60 ° C. Sealing was performed using the hot-melt butyl adhesive D having a maximum tensile strength of 0.4 kgf / cm ² and a maximum tensile stress of 40 kgf / cm ² when performed at −20 ° C.,
Multi-layer glass D was obtained. The present multilayer glass D had practical strength after cooling the sealant immediately after being laminated, and after 2 hours, the dew point of the air layer portion thereof was −60 ° C. or lower. However, after storage for 60 days in a thermo-hygrostat at 60 ° C. and 95% relative humidity, dew point of the air layer was room temperature or higher, and dew condensation occurred inside. Further, when the adhesive portion was observed, peeling was observed at the glass plate-sealant interface.
Furthermore, JIS R 3209 is used for the present double glazing D.
When the repeated heat and cold test specified in Class III was conducted,
It was impossible to continue the test because glass breakage occurred during cooling to -20 ° C.

[Comparative Example 2] An intermediate A was prepared in the same manner as in Example 1, and then the outer peripheral portion of the intermediate A was subjected to a tensile adhesion test specified by JIS A 5758 at a test temperature of 60 ° C. The maximum tensile strength is 8.0 kgh / cm ² , and the maximum tensile stress is 11 kgf when the same test is performed at -20 ° C.
/ Cm ² was used to seal, and a double-layer glass E was obtained. This double glazing E is a multi-layered glass 1
The sealant did not exhibit practical strength until the day after, and it was necessary to stand still for at least one day after sealing. Also, 60 ℃, 95%
The dew point of the air layer was −60 ° C. or lower even after 200 days of storage in a thermo-hygrostat having a relative humidity.

[0013]

According to the present invention, it is possible to shorten the assembling and manufacturing process of double glazing by using a specific hot-melt type sealant which takes a short time to develop the practical strength of the sealant, and to improve the productivity. At the same time, the durability of the double-glazing can be secured at the same time.

[Brief description of drawings]

FIG. 1 is an intermediate A of double glazing according to an embodiment of the present invention.
Partial cross section of

FIG. 2 is a partial cross-sectional view of a sealing portion of double glazing according to an embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of a sealing portion of double glazing according to an embodiment of the present invention.

[Explanation of symbols]

1: Aluminum spacer 2: Desiccant 3: Adhesive for primary sealing for double glazing 4: Glass plate 5: Hot melt type sealant for secondary sealing for double glazing 6: Resin spacer containing desiccant

Claims (1)

[Claims] 1. A maximum tensile stress of 0.5 kgf / cm ² or more when a tensile adhesion test specified by JIS A 5758 is conducted at a test temperature of 60 ° C., and the test is conducted at -20 ° C. Maximum tensile stress is 35kgf / c
A double glazing, characterized in that a hot-melt sealant having a m ² or less is used as a sealing material for a space holding portion between two opposing glass plates.