JPS60103054A - Composite panel having good heat insulation - Google Patents

Abstract

PURPOSE:To improve thermal insulation properties and reliability with a double- layered glass panel spread with a resin film via a spacer so as to divide internal air by using the spacer of which the ratio between the coefft. of thermal expansion and the modulus of elasticity is a specific value or below. CONSTITUTION:A plastic film 3 is held and spread by means of a spacer 2 in double-layered glass so as to divide the internal air layer in parallel with the glass 1 to constituted a double-layered glass panel. The intended thermal insulating double-layered glass panel is manufactured by using the spacer consisting of the material of which the coefft. of thermal expansion and the modulus of elasticity is the numerical value expressed by the equation or below. The preferable material of the spacer is exemplified by iron and the alloy thereof (e.g.; stainless steel). The breakage of the glass, etc. arise less with the resulted double- layered glass panel even if said panel is subjected repeatedly to a heat cycle from -40 deg.C to +70 deg.C and a high temp. difference of -40 deg.C on one side and 70 deg.C on the other side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an energy-saving insulating double glazing for architectural or refrigeration showcases. More details regarding layered glass.

3. Traditionally used for architectural windows and refrigeration. - The insulation of the case glass has been modified to reduce energy loss, prevent dew condensation, and improve livability by using double-glazed glass with 6 to 20 mm of air inside and I/4. In order to save energy for cooling, a solar control film coated with a thin film of goldfish and its oxide and attached to glass with an adhesive to reflect heat rays is used.

However, the insulation properties of this method are not practically sufficient, especially when used for window glass in cold 1θ regions or frozen housing cases, resulting in dew condensation, impeding visibility, and causing undesirable damage such as scratches on houses. Produces no wool.

The standard value for insulation of glass windows financed by Japan Housing Finance Corporation in cold regions such as Hokkaido and Tohoku is heat 1°↓flow coefficient 2KCa.
1)~'hr/C or less, but current double-glazed glass has an extremely high oxygen flow rate of E+, 4. @l (There have been various studies to combine plastic window frames with good heat insulation properties, but it is still difficult to achieve this standard.)

In addition, to overcome these drawbacks, triple-glazed glass with two layers of air inside is used in some cases, but it increases the thickness and weight significantly, making it difficult to open and close the window. Author:
This not only obstructs the window frame, but also complicates the window frame and its construction method and system, making it extremely economically expensive. In addition, in order to improve the drawback of glazing, a method of attaching a transparent plastic film with a surface coated to reflect infrared rays to the inside of the double-glazed glass using an adhesive adhesive is being considered; It is extremely difficult to apply without bubbles, and since it is directly adhered to the glass, it causes heat cracking of the glass. In addition, a method is being considered in which a plastic film is suspended in the middle of the double-glazed glass so that the air layer is divided into layers parallel to the glass surface, but this method involves repeated heating from a low temperature of -40℃ to a high temperature of +70℃. Under heat cycles and high temperature differences of -40°C on one side and 70°C on the other, subtle environmental factors such as stress caused by differences in expansion coefficients and elastic modulus between various materials and stress generated during panel manufacturing occur. Due to the internal stress and relaxation that change depending on the condition, undesirable defects such as a decrease in aesthetic appearance due to glass breakage and sagging of the film, a decrease in airtightness, and a decrease in durability and reliability in the case of long-term use occur.

We have developed double-glazed glass with a plastic film suspended in the middle, making it easy to open and close the window. Hereinafter, the double-glazed glass of the present invention will be referred to as a heat insulating plate, and 4 glass.

The plastic film used in the present invention may be formed by extrusion molding, calendar molding, solution casting molding, or by stretching a raw material formed by any of these processing methods. may be polyvinyl chloride, polyolenoino, polymethyl methacrylate, polyethylene terephthalate-1, polyvinyl acetate, polythamide, polysulfone, polyacetal, etc., and those with transparency and resistance (1) are preferable. Also, the heat ray reflection of metals and their compounds on the surface of plastic f:;i
, 'Those coated with IIA have good insulation properties,
It is more preferable to use a film that transmits visible light and reflects infrared rays. In that case, a glass window with excellent heat insulation properties and a comfortable bright field of vision can be obtained, further enhancing the effects of the present invention. Vacuum deposition, cathode sputtering, plasma spraying, vapor phase plating, and electrochemical plating can be used to form thin films of such metals and their compounds, and the types of metals and their compounds are A], Au,
Ari, Cu, Ni, ■n203, TiO2, 5n02,
A 20-5ooA thin film such as B12O3 is used.

A sealant for double-glazed glass is required to have cold resistance, heat resistance, weather resistance, and gas barrier properties, and butyl rubber, silicone rubber, and polysulfide rubber can be suitably used in the present invention.

As the glass that can be used in the present invention, generally commercially available architectural window glasses can be used, and they may be colored or provided with a reflective layer on the surface.

As a method of suspending the plastic film used in the present invention, two spacers (2) are used as shown in Figure 1.
A constant tension is applied to both ends of the film (3) between them, and the film (3) is held in a taut state, and the glass (1) is placed on both sides, sealed with a silicone sealant (4), and cured and fixed. Further, in the structure of the present invention, as shown in FIG. 2, if the film has two or more layers, a heat insulating double glazing glass with better heat insulation properties can be obtained.

As is generally known, the spacer used in the present invention preferably has a hollow shape so that a desiccant powder such as silica gel can be filled inside, and is preferable not only for preventing fog formation in the case of 1"<11. It has a remarkable effect on improving the durability of the film, and is particularly desirable in maintaining heat ray reflective ability in a heat reflective film.

As a spacer particle that brings about a remarkable effect in the present invention, aluminum, which is extremely commonly used without any problem in the production of general O, 1ψ glass, is fatal in the insulating double glazing of the structure of the present invention. It was found that this resulted in a major defect, and an intensive investigation was carried out.

As a result, the ratio of linear expansion coefficient to elastic modulus was 20XlO-12 (
(is/mtnlG,) or a spacer made of a material with 9 layers or less -40°C ~ -70°C
Under the harsh conditions of repeated heat cycles of The spacer material has good durability, reliability, light weight, and has the most significant effect on the present invention. As mentioned above, the spacer material has a coefficient of linear expansion and a coefficient of elasticity of <20XI.
O-12((mrn/'mrn/"C)/'(kg/'
mm) J or less, preferably ], o X ] 0'
2((mydvcJ/'(kg/mm) 11 or less.

The most preferable such material is iron and its alloys, such as carbon steel and stainless steel.

Iron and its alloys are more preferably electroplated or chemically plated if necessary for corrosion prevention and aesthetics.

Further, as a secondary effect, by using an iron or iron alloy spacer in the present invention, the heat transmission coefficient is improved by 0 to 20% compared to using an aluminum spacer.

The present invention will be explained below with reference to Examples.

Examples 1 to 4 and Comparative Example 1.2 Saka glass with a thickness of 3 mm and 900 m+nX900 mtπ,
Using a 12 m+l thick silica gel desiccant spacer and a 5 ott thick polyester film coated to reflect most of the infrared light with a visible light transmittance of 85%, The polyester film was sandwiched and fixed between the spacers under tension, and the silicone adhesive was sealed tightly with J [J] and cured to produce a heat-insulating double-layered glass.

After the assembled panel is left for 3 days, the temperature will rise between -4n℃ and +6℃.
0°C cold/heat cyclic test and ~4 on both sides of the insulating double glazing
The incidence of defects such as glass breakage, panel deformation, and film sagging in an environment with a temperature difference of 0°C to 60°C was measured. The results are shown in Table 1.

The aluminum and glass fiber-reinforced Twiron spacers, which have a high linear expansion coefficient/elastic modulus ratio, had a significantly high defect rate.

The heat transmission coefficient and the outside air temperature at which dew condensation starts on the inner surface at 60% humidity and 20° C. on the inner surface were measured again. The results are shown in Table 1.

As a result, it can be seen that the heat insulating multilayer panel of the present invention has an extremely excellent heat insulating effect and is highly reliable.

Comparative Examples 3 and 4 Two-layer glass and three-layer glass with aluminum spacers were prepared, and window opening/closing operability, heat transmission coefficient, failure rate, and outside temperature at the onset of dew condensation were measured in the same manner as in Example 1. The results are shown in Table 1.

Note that the glass used was 3 mm thick, and the spacer gap was 12+++ m.

[Brief explanation of drawings]

Figure 1, ? Figure 1fJ2 is a sectional view of the composite panel of the present invention. In the figure, 1 is a glass plate, 2 is a spacer, 3 is a plastic film, 4 is a noble agent, and 5 is a desiccant. Patent applicant Mitsui Toatsu Chemical Co., Ltd.

Claims (1)

[Claims] ]) A double-glazed glass panel with good thermal insulation properties, in which a spacer holds a plastic film stretched so as to divide an internal air layer parallel to the glass inside the double-glazed glass. The ratio of modulus and elastic modulus is 20X10-12J (mm to 8/(kq/'mm)
:) Insulating double-glazed glass characterized by being made of the following materials: