Weather-resistant adhesives have good adhesion to most substrates, transparent products, moderate mechanical strength, and faster surface cure. Weather-resistant adhesives are widely used for sealing joints between various glass, metal, aluminum, ceramic tile, plexiglass, and coated glass. The following small series introduces the use of weatherproof glue.
The use of weatherproof adhesive
1. Glass curtain wall: Even if the connection between glass and glass is better, there will still be a little gap. It is this gap that caused the collapse of glass under the influence of external forces, causing unnecessary trouble. Then using weatherproof glue can make weatherproof seal at the junction, and the safety system is greatly improved.
2. Roof construction: The waterproofing of roofs in a building is important and equally difficult. The use of weatherproofing glue can seal the joints of the roof construction and achieve waterproof effect.
3, building materials: weather-resistant adhesive its high temperature performance is remarkable, and can maintain good elasticity at +90 °C high temperature. Therefore, it is very suitable for bonding of different building materials, and secondly it does not need any base liquid when it is used.
Weathering cracking
1. The curing mechanism of weatherproof glue is: absorbing moisture in the air, y penetrates from outside to inside and solidifies. Under the standard test conditions (temperature is 23°C±2°C, relative humidity is 50%±5%), the dry-out time of the sealant is about 40min, and curing is about 2mm on the first day, the slower it goes to the deeper layer. Within one or two days after construction, the colloidal surface only forms a thin layer (approximately 1 to 2 mm), and the ability to withstand external environmental influences does not reach 5% of the fully cured surface. If it is subjected to uneven forces (such as wind pressure, vibration), cracking may occur.
2. Insufficient thickness of glue in plastic joints or incomplete plastic injection: JGJ 102-2003 “Technical Specifications for Glass Curtain Wall Engineering†10.3.7: The construction thickness of silicone building sealant should be greater than 3.5mm, and the construction width should not be less than the construction thickness. 2 times. This year's newly revised JGJ 102 specification will increase the minimum construction thickness to 5mm. It shows that the minimum construction thickness of 3.5mm in the original specification can not meet the actual requirements, and the construction thickness of the silicone sealant directly affects the quality of the project.
3, the construction is not standardized, design glue seam 16mm, the actual measurement of the largest glue 30mm, the smallest glue seam less than 10mm, the use of foam stick models 16mm and 18mm two models. The standard requires that the foam stick size be greater than 25% of the actual glue gap width.
4, picking errors. The roof is exposed to a long period of sunshine, and the deformation of the material caused by thermal expansion and contraction is relatively large. The displacement capacity of ordinary weatherproof glue is ±25%, which cannot meet the requirements for the use of roof construction. In 2009, the China Curtain Wall Engineering Committee entrusted a group of experts to draft the “Technical Specifications for Lighting Roofsâ€, which has a clear requirement for the elongation rate of weatherable rubber.
The characteristics of weatherproof adhesive
1. Good embedment, extrusion construction, storage stability, non-toxic or low toxicity;
2. Low penetration of liquids, gases, semi-solids, and other media;
3, have enough ability to withstand the pressure, can resist telescopic movement, displacement and deformation joints;
4, in the cyclic deformation joints, to ensure its full recovery of performance and shape;
5, good weather resistance, no chalking, cracking, dissolution or excessive shrinkage, will not be excessive softening at high temperatures, low temperature brittle fracture;
6, has a certain degree of wear resistance, puncture resistance, corrosion resistance, rolling resistance, no pollution, insulation or conductive properties.
Editor's summary: With regard to the use of weatherproof adhesives and the introduction to it, I hope to be helpful to everyone. If you want to know more related information, you can pay attention to this website information.
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