How to choose insulating glass raw materials

2022-08-12
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How to choose the raw material of insulating glass

since the insulating glass started in China in the 1960s, its production has gone through the processes of double glass, simple double glass, manual single channel sealing, double channel sealing and composite adhesive strip insulating glass in recent years. After nearly 40 years of development, the market has gradually matured

since the beginning of insulating glass in China in the 1960s, its production has gone through the processes of double glass, simple double glass, manual single channel sealing, double channel sealing and composite adhesive strip insulating glass in recent years. After nearly 40 years of development, the market has gradually matured. With the attention paid to building energy conservation in China, the quality of insulating glass has been put on the agenda

the main factors affecting the quality of insulating glass are:

(1) the selection of raw materials

(II) manufacturing process. Here we mainly talk about the selection of raw materials for insulating glass. The quality of raw materials will directly affect the quality and service life of insulating glass

at present, there are three main types of insulating glass in China:

(I) trough aluminum single channel seal

(II) groove aluminum double seal

(III) composite sealant strip insulating glass. Trough aluminum single channel seal, due to its poor sealing performance, easy to enter moisture, resulting in glass condensation, frosting, and short service life, so this kind of insulating glass is gradually eliminated. The raw materials of the latter two kinds of insulating glass are mainly glass, aluminum strip, corner socket, butyl rubber, two-component polysulfide glue or silicone cave glue, desiccant and composite sealant strip. Here is a brief talk about the selection of these raw materials

I. selection of glass:

1. The original glass used to manufacture insulating glass can be colorless float glass, coated glass, tempered glass, laminated glass, etc. The use of ordinary flat glass should be avoided. The transparency and strength of ordinary flat glass cannot meet the requirements. The original glass pieces mentioned above must meet the requirements of the corresponding standards. After too long-term development, they can only be used after passing the inspection.

2. Different batches of glass from different manufacturers should be checked for color difference before cutting, Large color difference "The certification of materials and the technical service ability of material suppliers are also the requirements for the utilization of engineering materials. Glass is used in different projects or different building facades.

3. The cutting size of glass should be strictly implemented according to the requirements of the drawing. At the same time, the operator should pay attention to the glass surface, and there should be no obvious defects such as scratches and bubbles.

II. The selection of aluminum strips and corners

1. The thickness of aluminum strips should be between 0..35mm, thick The degree of permeability shall be uniform, and the holes shall be evenly distributed within ± 0.1% of the set value of ventilation. Aluminum strips must be anodized or decontaminated and bent. Products with good quality and high grade must be selected. Improve the utilization rate of aluminum bars

2. The size of the insertion angle should be selected and the surface should be cleaned

III. desiccant

at present, there are three types of desiccants used for insulating glass: 1. Those with good absorption capacity of volatile matter; 2. The adsorption capacity of inert gas is the lowest; 3. Ordinary molecular sieve. Users should consult the manufacturer according to their own rubber questions, and select the appropriate molecular sieve. At the same time, the molecular sieve should also have the appropriate particle size (.5mm) and hardness. In addition, the environment in which molecular sieves are used should be dry. The filled molecules should be used within 1.5 hours, and the exposed molecular sieves should be used busy to ensure the quality of insulating glass

IV. selection of sealant

1. Butyl adhesive:

butyl adhesive is the first seal of aluminum strip insulating glass. It is a kind of hot-melt adhesive with low water vapor transmission (the lowest among insulating glass adhesives) and high viscosity. It is the most effective barrier for blocking water vapor between the side of aluminum strip and glass, but it needs to be heated, pressurized, extruded and coated on both sides of aluminum strip by special machines

at present, there are many domestic butyl rubber manufacturers, but the heating temperature and pressure of the rubber produced by each company are different. Some manufacturers' butyl rubber can't even be coated by machine, which is often interrupted due to impurities. This requires users to choose high-quality products and understand its use requirements

2. Polysulfide adhesive:

polysulfide adhesive is the largest amount of insulating glass sealant at present. Polysulfide adhesive has good oil resistance, solubility resistance and sealing performance. Polysulfide adhesive should be polymerized with metal oxide as curing agent. The ratio of the two components is about 1:10. The mixing ratio and uniformity have little influence on the effect, so this adhesive can be applied by machine or by hand

selection requirements for polysulfide adhesive: clear color difference between two components; Valid for more than half a year; Strong UV resistance; It has good fluidity and curing elasticity

3. Silicone sealant

silicone sealant has structural, aging resistance and UV resistance, but its weakness is high water vapor transmission. Therefore, the cave glue is suitable for places with strong light and poor environment, such as glass curtain walls. At the same time, butyl glue must be used as the leading seal. In the past, China relied on imports for a long time. Now, the State Economic and Trade Commission has specially set up a leading group of silicone rubber to carry out safety certification for structural rubber. At present, four companies in China, including Zhengzhou Zhongyuan and Guangzhou Baiyun, have passed the certification

v. composite sealant strip

this is a composite sealing material developed by American chemists in the 1980s. The adhesive strip is a raw material of insulating glass that integrates the support framework (wavy aluminum strip), sealing (butyl rubber) and drying (desiccant). Its biggest advantages are simple operation process, less waste of raw materials, less personnel, low management cost and good operating environment. The disadvantage is that the adhesive strip absorbs moisture slowly, so special equipment is required. At present, the price of adhesive strips is relatively high due to output constraints. The selection of composite sealant strips should consider the smooth surface, the quality of aluminum strip, the content of adhesive, and the moderate viscosity

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