JPH0986975A - Production of spacer for double-layer glass plate and double-layer glass plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a spacer for a double-layer glass plate inhibiting water invasion for a long time, excellent in prevention of dew formation by using, as a basic material of the spacer, a partially vulcanized butyl rubber, formulating other specific ingredients to rubber, kneading and molding them. SOLUTION: This spacer for a double-layer glass plate having flexibility and self tacking character is produced as follows; as the basic rubber of a spacer, a partially vulcanized butyl rubber having 30-50% of gelation is blended with a reactive organic silicon compound, kneaded, formulated with a drying agent or a moisture absorbent, kneaded and molded. The mixing ratio of the composition is preferably 15-40wt.% of a partially vulcanized butyl rubber, 0.3-0.6wt.% of a reactive organic silicon compound and 20-30wt.% of a drying agent or a moisture absorbent based on the total 100wt.% of prescribed 3 components and other additive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a spacer for double glazing and double glazing, and more specifically, it prevents moisture from entering the hollow layer of the double glazing for a long period of time and is excellent in dew condensation prevention. The purpose is to provide double glazing.

[0002]

2. Description of the Related Art Conventionally, double glazing obtained by separating a plurality of glass plates with spacers and sealing the periphery thereof has heat insulating, soundproofing and antifogging effects, and is used for construction, vehicles or various industries. Widely used as window glass for automobiles. As one type of this double glazing, there is one in which two glass plates 1 and 1'are laminated by a spacer 2 having self-adhesiveness, as illustrated in the schematic sectional view of FIG. This type of double glazing spacer 2 is flexible, self-adhesive and made of a rubber-like substance in which a desiccant substance is dispersed and mixed, and is usually a ribbon-like spacer having a rectangular cross section. A molded product is used.

In this multi-layer glass, the above-mentioned spacers are laid on the periphery of one glass plate, and then the spacers are sandwiched by another glass plate to combine the two glass plates 1, 1 '. Since it can be manufactured by directly bonding it by utilizing the self-adhesiveness of the spacer 2, it has the advantage of being able to manufacture the double glazing very easily, and is highly evaluated.

As a technique of double glazing in which a plurality of glass plates are separated and assembled by such a flexible and self-adhesive rubber spacer, Japanese Patent Publication No. 61-2050.
There is a technique for assembling double glazing described in 1.

In this type of technique, a flexible and self-adhesive rubbery spacer for assembling double glazing is designed to prevent cold flow during storage or after assembly into double glazing. There is. Moreover, these rubber spacers can be continuously laid on the periphery of the glass plate, including the corners thereof. In addition, since partially vulcanized butyl rubber is used as the base rubber of the spacer so that it has adhesiveness that can be bonded to the glass plate surface, even when the spacer is laid along the periphery of the glass plate, even at the corners. The spacer can be maintained in a bent state.

Further, the distance between the glass plates of the double glazing can be maintained at a predetermined distance, and the spacers are sufficiently bound by the adhesiveness of the spacers between the glass plates. In addition, this spacer is characterized in that the compression recovery characteristic and the poly gentac of the spacer are specified within a predetermined range so that the spacer does not become too sticky and the workability is impaired, and that the weight loss due to the heat treatment of the spacer is small. I am trying.

However, in the case of the above-mentioned prior art, the hollow layer of the double glazing can be kept in a dry state in the short term to prevent dew condensation, but in the long term, the interface between the rubber spacer and the glass plate can be prevented. When water penetrates, the adhesive force between the rubber spacer and the glass plate is significantly reduced. As a result, the spacer and the glass plate are separated from each other, and water enters the hollow layer of the double-glazing unit from the interface between the spacer and the glass plate. This moisture saturates the desiccant material and hygroscopic material in the spacer, and after several years, due to the temperature difference between the two sides of the double glazing,
There is a problem that dew condensation occurs on the glass plate surface in the double glazing and the life of the double glazing is shortened.

A method of kneading a reactive organic silicon compound into a rubber spacer is known as a method of increasing the durability of viscous adhesion between the rubber spacer having flexibility and self-adhesiveness and the glass plate. For example, US Pat. No. 37
There is a method described in the specification of No. 91910.

[0009]

However, in the case of the above-mentioned prior art, the reactive organosilicon compound kneaded into the rubber spacer hinders the hygroscopic performance of the desiccant substance dispersed and mixed in the rubber spacer. The compound generated by the hydrolysis of the reactive organosilicon compound enters the air layer of the double glazing, which causes the dew point temperature of the double glazing after production to be difficult to lower.

Accordingly, the object of the present invention is to provide flexibility,
In a multi-layer glass in which a plurality of glass plates are layered by a spacer using a rubber-like substance having adhesiveness as a base material, the adhesive strength of the spacer and the glass plate is high,
It has excellent anti-condensation properties shortly after manufacturing, prevents moisture from entering the hollow layer of the double-layer glass for a long time, and has excellent long-term dew condensation prevention properties. It is to provide a rubber spacer for laminated glass and double glazing.

[0011]

DISCLOSURE OF THE INVENTION The present invention is a method for producing a flexible and self-adhesive rubber spacer for double glazing, wherein a partial vulcanization having a degree of gelation of 30 to 50% is applied. Using butyl butyl rubber as the base rubber for the spacer, first mix the reactive organosilicon compound with the partially vulcanized butyl rubber,
Provided is a method for producing a rubber spacer for double glazing, which comprises kneading, then blending a desiccant substance or a hygroscopic substance, kneading and molding.

Further, the present invention provides a multi-layer glass in which a plurality of glass plates are opposed to each other through a rubber spacer having flexibility and self-adhesiveness so as to form a hollow layer. The spacer material is a partially vulcanized butyl rubber having a degree of partial vulcanization with a gelation rate of 30 to 50%, and the partially vulcanized butyl rubber has a reactive organosilicon compound, a desiccant substance or a hygroscopic substance substance, Further, there is provided a double glazing, which is characterized in that it is formed by mixing and kneading additives.

According to the present invention described above, when a plurality of glass plates are layered by a spacer having a flexible rubber-like substance as a base material, the spacer and the glass plates are adhered to each other. High adhesion durability, excellent dew condensation prevention from the time immediately after manufacturing, moisture does not enter the hollow layer of the double-glazed glass for a long time, excellent long-term dew condensation prevention, and opaque glass plate due to dew condensation There is provided a multi-layer glass that solves the above problem.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A multi-layer glass assembled by separating a plurality of glass plates by a rubber spacer having flexibility and self-adhesiveness according to the present invention is characterized by the structure of the spacer. The structure of the double glazing itself may be any conventionally known structure and is not particularly limited.

FIG. 1 is a schematic cross-sectional view showing an example of the double glazing of the present invention. As shown schematically in FIG. 1, the double glazing of the present invention comprises glass plates 1 and 1 ′ having an appropriate thickness and rubber spacers 2 having flexibility and self-adhesiveness at all ends thereof. The main structure is a structure in which a hollow layer 3 is formed between both glass plates 1 and 1 ′ by stacking them with each other.

FIG. 2 is a schematic cross-sectional view for explaining an example in which the outer periphery of the rubber spacer 2 similar to the double glazing shown in FIG. 1 is further filled with the sealing material 4. Fig. 3 is a schematic cross-sectional view illustrating a double glazing using three glass plates 1, 1 ', 1 ". Fig. 4 is a laminated glass 5 as one glass plate of the double glazing. It is a schematic sectional drawing explaining the example which used.

As described above, the structure of the double glazing of the present invention may be composed of two glass plates, or may be composed of three or more glass plates.

In the structure of these double glazings, the glass plates 1, 1 ′ and 1 ″ are usually glass plates such as windows and doors widely used for building materials, vehicles, tempered glass,
Laminated glass, glass with metal mesh, heat-absorbing glass, further heat-reflecting glass, low-emissivity glass, etc., glass plate with a thin coating of metal or other inorganic substance on the inner surface, acrylic resin plate called organic glass, It is a polycarbonate plate or the like and is not particularly limited.

The main feature of the present invention lies in the constitution of the spacer used in the constitution of the above-mentioned double glazing and the manufacturing method thereof.

As the partially vulcanized butyl rubber used in the present invention, a partially vulcanized butyl rubber having a degree of partial vulcanization with a gelation rate of 30 to 50% is used. If the gelation rate of the partially vulcanized butyl rubber is less than 30%, cold flow is likely to occur in the molded spacer, the shape retention of the spacer and a constant air layer retained in the double glazing composed of the spacer. It is not preferable because it will not be performed. On the other hand, if the gelation rate of the partially vulcanized butyl rubber exceeds 50%, it is difficult to obtain a flexible spacer, and it is difficult to continuously lay the spacer around the periphery of the glass plate during the production of double glazing. It is not preferable because it becomes

Examples of these partially vulcanized butyl rubbers include, for example, Tonex butyl rubber escorant 8 and butyl rubber escorant 10. As the spacer, polyisobutylene, polybutene, halogenated butyl rubber, other various rubber components are added in order to improve flexibility and adhesiveness of the partially vulcanized butyl rubber which is a base rubber, and the desired vulcanized butyl rubber is added. It is preferred to provide flexibility and self-adhesion.

The reactive organosilicon compound used in the present invention includes, for example, the reactive organosilicon compound represented by the following general formula. R ^A in the following general formula is an alkyl group such as a methyl group or an ethyl group, a vinyl group, a γ-glycidoxypropyl group, a β-3,4-epoxycyclohexyl group,
γ-methacryloxypropyl group, γ-acryloxypropyl group, γ-aminopropyl group, N- (β-aminoethyl) -γ-aminopropyl group, γ-chloropropyl group,
γ-mercaptopropyl group and the like, a functional group mainly composed of a hydrocarbon and may contain oxygen, nitrogen, chlorine or sulfur, R ^B and R ^C are a hydrocarbon group such as a methyl group and an ethyl group. , R ^f is C _k F _{2k + 1} · C _j H
Fluorine-containing alkyl groups represented by _{2j + 1 and the} like are represented by j and k
Represents a natural number, m represents an integer of 0 to 2, and n represents an integer of 1 to 3.

(R ^A ) _n Si (R ^B ) _m (OR ^C ) _4-mn , (R ^A ) _n Si (R ^B ) _m (Cl) _4-mn , (R ^f ) _n Si (R ^B ) _m (OR ^C ) _4-mn , (R ^f ) _n Si (R ^B ) _m (Cl) _4-mn .

Specific examples of the reactive organosilicon compound include, for example, methyltrimethoxysilane, ethyltrimethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane. , Β-
(3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ
-Glycidoxypropylmethyldiethoxysilane, γ-
Methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, N- (β-aminoethyl) -γ-aminopropyltrimethoxysilane, N- (β-aminoethyl) -γ-aminopropylmethyldimethoxysilane, N- (β-aminoethyl) -γ
-Aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-chloropropyltrimethoxysilane,
γ-mercaptopropyltrimethoxysilane and the like can be mentioned.

In the present invention, first, the partially vulcanized butyl rubber is mixed with the above-mentioned reactive organosilicon compound and kneaded, and then the mixture is mixed with a desiccant substance or a hygroscopic substance and kneaded. . By setting the mixing and kneading order of the spacer constituents in this manner, the durability of the viscous adhesive force between the obtained spacer and the glass plate can be enhanced. In addition, it is possible to prevent moisture from entering the interface between the spacer and the glass plate due to the separation of the spacer and the glass plate from entering the hollow layer of the multilayer glass. As a result, in the long term, dew condensation does not occur on the glass plate surface in the double glazing, and the life of the double glazing can be extended.

In the present invention, a desiccant substance or a hygroscopic substance is dispersed or mixed uniformly or in a certain distribution in the formed spacer in order to adsorb the moisture in the hollow layer of the double-glazing unit. As the desiccant substance or the hygroscopic substance, one having a function of adsorbing water even in the base rubber is used, and examples thereof include powdery synthetic crystalline zeolite, synthetic crystalline metal aluminosilicate, and activated alumina. , Sintered silica, anhydrous calcium sulfate, silk gel and the like can be used. Above all, molecular sieve 3A,
4A, 9F, etc. are optimal.

The mixing ratio of the above components constituting the spacer of the present invention is the total of the partially vulcanized butyl rubber, the reactive organosilicon compound, the desiccant substance or the hygroscopic substance, and the additives which are the constituent components of the rubber spacer. Is 15 to 40% by weight, the reactive organosilicon compound is 0.3 to 0.6% by weight, and the desiccant or hygroscopic substance is 20 to 30% by weight. preferable.

If the proportion of the partially vulcanized butyl rubber is too low in the above blending proportion, the water vapor permeability of the rubber spacer becomes high, resulting in a faster moisture infiltration rate into the hollow layer of the double glazing, which results in a long term. It is not preferable because the dew point maintenance performance cannot be obtained and the life of the double glazing is shortened. On the other hand, if the proportion of partially vulcanized butyl rubber is too high, the water vapor permeability of the rubber spacer becomes low, and the ability of the desiccant substance in the spacer to absorb the moisture in the hollow layer of the double glazing becomes lost. It is not preferable because the dew point temperature of the double glazing is difficult to lower.

On the other hand, if the proportion of the reactive organosilicon compound is too low, the viscous adhesion durability between the rubber spacer and the glass plate will be insufficient, and the spacer and the glass plate will peel off. Moisture enters from the interface with the plate to cause dew condensation on the glass surface in the multilayer glass, which is not preferable in that the life of the multilayer glass is shortened. On the other hand, when the proportion of the reactive organosilicon compound is too high, the hygroscopic performance of the desiccant substance or the hygroscopic substance dispersed and mixed in the rubber spacer is impaired, or the compound generated by the hydrolysis reaction of the reactive organosilicon compound. However, it is not preferable because it penetrates into the hollow layer of the double glazing and the dew point temperature of the double glazing after production is difficult to decrease.

If the ratio of the desiccant substance or the hygroscopic substance is too low, the period until the desiccant substance or the hygroscopic substance is adsorbed by the moisture invading from the outside of the double glazing to be saturated is shortened. As a result, the life of the double glazing is shortened, which is not preferable. On the other hand, if the ratio of the desiccant substance or the hygroscopic substance is too high, the water vapor permeability of the rubber spacer becomes high, and the moisture penetrates into the hollow layer of the double glazing from the outside of the double glazing through the rubber spacer. This is not preferable because it tends to occur, and the shape retention of the spacer is reduced.

Further, in order to form the spacer of the present invention, in addition to the above-mentioned base material partially vulcanized butyl rubber, reactive organosilicon compound, desiccant substance or hygroscopic substance, a tackifier and a reinforcing agent. , A reinforcing filler, a non-reinforcing filler, a spacer shape-retaining agent, a flexibility control agent, a flowability improving agent, and various other components as necessary.

For example, as the tackifier, aliphatic hydrocarbon resin, aromatic hydrocarbon resin, hydrogenated alicyclic hydrocarbon resin, alicyclic hydrocarbon resin, coumarone resin, terpene resin , Rosin derivatives and the like, and reinforcing fillers such as white carbon, carbon black, ultrafine precipitated calcium carbonate, hard clay, magnesium carbonate, polyethylene, polypropylene, high styrene resin, cyclized rubber, coumarone-indene resin, Phenol-
Formaldehyde resin, modified melamine resin, petroleum resin,
Examples thereof include styrene copolymer and lignin.

As the non-reinforcing filler, calcium carbonate, kaolin clay, wax clay, talc, sericite, calcined clay, mica, bentonite, calcium silicate, pumice powder, slate powder, magnesium silicate, aluminum silicate, Diatomaceous earth, silica sand, barium sulfate, titanium oxide, reclaimed rubber, ebonite powder, shellac, wood powder, coconut powder, cork powder, cellulose powder, wood pulp,
Suitable are cotton linters, fiber powders and the like, and polybutene, polybutadiene, polyisobutylene and the like are suitable as the flexibility controlling agent.

Regarding the order of mixing and kneading the spacer constituting material, the partially vulcanized butyl rubber and the reactive organic compound are first mixed and kneaded, and the desiccant substance or the hygroscopic substance is finally mixed and kneaded. It is preferable that the moisture absorbing ability of the desiccant substance or the hygroscopic substance is not deteriorated and that the adhesive force between the rubber spacer and the glass plate is increased. The other necessary components may be blended and kneaded in any order or simultaneously. The kneading method of each component is not particularly limited, such as a method of kneading the raw material mixture using a kneader.

The spacer of the present invention can be molded into an arbitrary shape by using a general molding method such as extrusion molding using the above mixture. The forming may be carried out in advance before forming the double glazing, and at the time of manufacturing the double glazing, the mixture is directly extruded between two separated glass plates to form the double glazing. The spacers may be molded at the same time.

As the spacer for double glazing of the present invention,
A partially vulcanized butyl rubber, which is a base rubber, and a composition in which various components necessary for a spacer are added are used in a desired spacer shape. By forming the ribbon into a rectangular cross-section as a preferable shape, the molded body has a rigidity that can maintain a space as a spacer of double glazing, and can be laid on a glass plate with its corner portions bent. Can have flexibility. Further, only by laying the spacer on the glass plate surface, it is possible to have self-adhesiveness enough to bond at the interface between the glass plate surface and the spacer surface, and to make the adhesiveness permanent. Further, the airtightness of the hollow layer of the double glazing is maintained, but the water vapor permeability is sufficient for the function of the desiccant substance dispersed and mixed in the spacer.

[0037]

Next, the present invention will be described more specifically with reference to examples and comparative examples. "Parts" are parts by weight.

"Example 1" A flexible and self-adhesive rubber spacer of the present invention was prepared as follows.

First, partially vulcanized butyl rubber (manufactured by Tonex Co., Ltd., Escorant 10: gelation rate 35%) 10
0 parts and 2.8 parts of the reactive organosilicon compound (γ-glycidoxypropyltrimethoxysilane) were uniformly mixed and kneaded.

Second, polyisobutylene (manufactured by Tonex Corp., Vistanex LM-M) is added to these mixtures.
H) 120 parts, tackifier (manufactured by Tonex Corp., Escolettes 5320) 50 parts, white carbon (manufactured by Nippon Silica Co., Ltd., Nipsil VN-3) 20 parts and calcium carbonate 30 parts so as to be uniform. Mixed in.

Thirdly, 50 parts of carbon black (manufactured by Tokai Electrode Co., Ltd., HAF Seed 3) was uniformly mixed and kneaded with these mixtures.

Fourth, synthetic zeolite (Duosorb K-4A manufactured by Fuji Davison Co., Ltd.) is added to these mixtures.
100 parts were uniformly mixed to obtain a spacer-forming mixture. Using this mixture, a ribbon-shaped spacer of the present invention having a rectangular cross section with a width of 5 mm and a height of 7 mm was formed.

Example 2 A flexible and self-adhesive rubber spacer of the present invention was prepared as follows.

First, 100 parts of partially vulcanized butyl rubber (manufactured by Tonex Co., Ltd., Escorant 10) and 1.4 parts of a reactive organic silicon compound (γ-glycidoxypropyltrimethoxysilane) were made uniform. Blended and kneaded. Secondly, to these mixtures, 120 parts of polyisobutylene (manufactured by Tonex Co., Ltd., Vistanex LM-MH),
Tackifier (manufactured by Tonex Corp., Escoletz 53)
20) 50 parts, white carbon (Nippon Silica Co., Ltd.)
Manufactured by Nipsil VN-3) (20 parts) and calcium carbonate (30 parts) were uniformly mixed.

Thirdly, 50 parts of carbon black (manufactured by Tokai Electrode Co., Ltd., HAF Seed 3) was uniformly mixed and kneaded with these mixtures. Fourthly, 100 parts of synthetic zeolite (Duosorb K-4A, manufactured by Fuji Davison Co., Ltd.) was uniformly mixed and kneaded with these mixtures to obtain a spacer-forming mixture. Using this mixture, a ribbon-shaped spacer of the present invention having a rectangular cross section with a width of 5 mm and a height of 7 mm was formed.

Example 3 A flexible and self-adhesive rubber spacer of the present invention was prepared as follows.

First, 100 parts of partially vulcanized butyl rubber (Escorant 10 manufactured by Tonex Co., Ltd.) and 1.4 parts of a reactive organic silicon compound (γ-glycidoxypropyltrimethoxysilane) were made uniform. Blended and kneaded. Secondly, to these mixtures, 120 parts of polyisobutylene (manufactured by Tonex Co., Ltd., Vistanex LM-MH),
Tackifier (manufactured by Tonex Corp., Escoletz 53)
20) 50 parts and 20 parts of white carbon (Nippsil VN-3, manufactured by Nippon Silica Co., Ltd.) were blended and kneaded so as to be uniform.

Thirdly, 50 parts of carbon black (HAF Seed 3 manufactured by Tokai Electrode Co., Ltd.) was uniformly mixed with these mixtures. Fourthly, 130 parts of synthetic zeolite (Duosorb K-4A manufactured by Fuji Davison Co., Ltd.) was uniformly mixed and kneaded with these mixtures to obtain a spacer-forming mixture. Using this mixture, a ribbon-shaped spacer of the present invention having a rectangular cross section with a width of 5 mm and a height of 7 mm was formed.

Comparative Example 1 A spacer of Comparative Example was formed in the same manner as in Example 1 except that the time of mixing the reactive organosilicon compound was changed to the time of mixing calcium carbonate or carbon black.

Comparative Example 2 A spacer was formed in the same manner as in Example 1 except that the reactive organic silicon compound was not mixed.

"Evaluation" The adhesive strength of the rubber spacers of Examples 1 and 2 with the glass plate was evaluated as follows.

The ribbon-shaped spacers of Examples 1 and 2 were sandwiched between two glass plates of 50 mm × 50 mm × 8 mm to produce an H-shaped sample. In addition, H type samples were similarly manufactured for the spacers of Comparative Examples 1 and 2. After curing these samples at 23 ° C. for 4 days, a tensile test was performed. The spacers of Example 1 and Example 2 both had a tensile strength of 3.4 kg / cm ² and maintained a high viscous adhesive force with the glass plate. In contrast, the spacer of Comparative Example 1 and Comparative Example 2, tensile each strength 2.3 kg / cm ² and 2.6 kg / cm ²
The adhesive strength with the glass plate was lower than that of the spacers of Examples 1 and 2.

The durability of the viscous adhesive strength of the rubber spacers of Examples 1 to 3 with the glass plate was evaluated as follows.

The ribbon-shaped spacers of Examples 1 to 3 were replaced by 5
An H-shaped sample was manufactured by sandwiching it between two glass plates of 0 mm × 50 mm × 8 mm. Further, for the spacer of Comparative Example 2, an H-shaped sample was similarly manufactured. These samples were aged at 23 ° C for 4 days and then placed in warm water at 60 ° C for 2 days.
After dipping for a week and leaving it for 1 day, a tensile test was performed. Each of the spacers of Examples 1 to 3 has a tensile strength of 3.1 kg.
/ Cm ² , 3.0 kg / cm ² and 1.9 kg / cm
^{It was 2} , and the adhesive strength was maintained. On the other hand, the spacer of Comparative Example 2 was peeled from the glass plate while being immersed in warm water of 60 ° C. for 2 weeks, and the adhesive strength with the glass plate was reduced.

The multi-layer glass of the present invention shown in the schematic cross-sectional view of FIG. 1 was produced by forming two transparent glass plates 1 and 1 ′ through the spacer of Example 1 into multiple layers. With respect to the spacers of Examples 2 and 3, double glazings were prepared using the spacers.

Regarding the double-glazing obtained above, the dew point temperature drop performance after the production of the double-glazing produced by double-layering two transparent glass plates through the spacer of Comparative Example 1 It was compared with the dew point temperature drop performance. When the dew point temperature was measured one week after the production, the double glazings of Examples 1 to 3 had dew point temperatures of −42 ° C., −45 ° C. and −
41 ° C., and their dew point temperature has dropped sufficiently,
While the dew condensation prevention effect was exhibited, the dew-point temperature of the double-glazing made of the spacer of Comparative Example 1 was -25 ° C, and the dew-point temperature did not drop sufficiently, so that the dew-condensation prevention effect was unsatisfactory. It was enough.

With respect to the double glazing of the present invention obtained above, the effect of preventing dew condensation is compared with that of the double glazing prepared by making two transparent glass plates into a multi-layer through the spacer of Comparative Example 2. did. When the dew point temperature was measured after exposure for 210 days in a hot and humid environment at a temperature of 60 ° C. and a humidity of 95%,
The double glazings of Examples 1 to 3 all have a dew point temperature of -35.
The temperature was not higher than 0 ° C, and the effect of preventing dew condensation was maintained, whereas the dew point temperature of the double-glazing made of the spacer of Comparative Example 2 in which the reactive organosilicon compound was not mixed was 9 ° C, and dew condensation occurred. It was easier.

When the appearance was observed, the double glazings of Examples 1 to 3 showed that the spacer and the glass plate were adhered over the entire circumference, whereas the reactive organic silicon compound of Comparative Example 2 was used. In the double glazing made with spacers that were not mixed, a part where the spacer and the glass plate are peeled off is seen, the adhesive force between the spacer and the glass plate is reduced, and the water content from the interface between the spacer and the glass plate is reduced. It was found that water easily penetrates, and therefore moisture easily enters the hollow layer of the double-glazing, and the life of the double-glazing is short.

[0059]

INDUSTRIAL APPLICABILITY According to the present invention, the adhesive strength between the spacer of the double glazing glass and the glass plate and the durability thereof are high, and the dew condensation prevention property is excellent immediately after the production, and the hollow layer of the double glazing Provided is a double-layer glass that does not allow moisture to penetrate into the glass for a long time, has an excellent property of preventing dew condensation for a long time, and solves the problem of opacity of a glass plate due to dew condensation.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of double glazing in the present invention.

FIG. 2 is a schematic cross-sectional view showing an example of double glazing in the present invention.

FIG. 3 is a schematic cross-sectional view showing an example of double glazing in the present invention.

FIG. 4 is a schematic cross-sectional view showing an example of double glazing in the present invention.

[Explanation of symbols]

 1, 1 ', 1 ": Glass plate 2, 2': Flexible and self-adhesive rubber spacer 3, 3 ': Hollow layer 4, 4': Sealing material 5: Laminated glass

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C08L 23/22 KFP C08L 23/22 KFP

Claims (4)

[Claims] 1. A method for producing a rubber spacer for double glazing which is flexible and self-adhesive, and has a gelation rate of 30 to 5
Using a partially vulcanized butyl rubber having a degree of partial vulcanization of 0% as a base rubber of a spacer, first, a reactive organosilicon compound is mixed with the partially vulcanized butyl rubber and kneaded, and then a desiccant substance or a hygroscopic substance is mixed, A method for producing a rubber spacer for double glazing, which comprises kneading and molding. 2. When the total of the partially vulcanized butyl rubber, the reactive organosilicon compound, the desiccant substance or the hygroscopic substance and the additive which are the constituent components of the rubber spacer is 100% by weight, the butyl rubber is 15% by weight. The method for manufacturing a spacer according to claim 1, wherein the content of the reactive organic silicon compound is 0.3 to 0.6% by weight, and the content of the desiccant material or the moisture absorbent material is 20 to 30% by weight. 3. A double-glazing unit comprising a plurality of glass plates arranged opposite to each other via a rubber spacer having flexibility and self-adhesiveness at the peripheral edge of the glass plates so as to form a hollow layer, The rubber spacer has a gelation rate of 30 to 50%.
Partially vulcanized butyl rubber having a degree of partial vulcanization is used as the base rubber of the spacer, and the partially vulcanized butyl rubber is compounded and kneaded with a reactive organosilicon compound, a desiccant substance or a moisture absorbent substance, and an additive. Double glazing characterized by 4. If the total of the partially vulcanized butyl rubber, the reactive organosilicon compound, the desiccant substance or the moisture absorbent substance, and the additives which are the constituents of the rubber spacer is 100% by weight, the butyl rubber is 15% by weight. 4. The double glazing according to claim 3, wherein the content of the reactive organic silicon compound is 0.3 to 0.6% by weight, and the content of the desiccant substance or the hygroscopic substance is 20 to 30% by weight.