1. Is there any standard for sealant construction in winter?

The national and industrial standards of building silicone weather-resistant sealant, GB/T 22083-2008, JC/T 882-2001, JC/T 882-2001, JGJ102-2003 and JGJ133-2001 of the relevant standards of building curtain wall, technical specifications for glass curtain wall engineering, technical specifications for metal and stone curtain wall engineering, etc. do not clearly stipulate the construction environment of silicone weather-resistant sealant, therefore, the construction should be carried out in accordance with the recommend environmental requirements of the construction process of the silicone weather-resistant sealant manufacturer.

2. Can glue be applied when the temperature is lower than 4 degrees in winter and the relative humidity is 35%? Why?

It is not recommended that the user construction glue, because:

1. When the temperature is too low, the wettability of the glue and the surface of the substrate is reduced, and there may be fog or frost on the surface of the substrate, which affects the adhesion of the sealant and the substrate.

2. Under low temperature conditions, the curing speed of silicone sealant is slower than normal. Sealant has not been cured before the joint changes, easy to cause the surface of the sealant bulge or crack, affecting the appearance of the sealant.

If the user due to the curtain wall project to catch up with the construction period, construction in winter, the need to record the temperature of the project location, when the temperature is higher than 4 ℃, can be constructed; When the temperature is lower than 4 ℃, construction is not recommended. If the user must be under the condition of construction below 4 ℃, it is recommended to carry out a small area glue test before use, and carry out an adhesion test to confirm that the adhesion is good and the appearance is no problem before large-area use. In the process of large-area glue use, it is necessary to increase the on-site rubber tapping inspection frequency of silicone weather-resistant sealant, make quality control records, and ensure the construction quality.

3. Can silicone weather-resistant glue be injected into curtain wall construction below minus 5 degrees in winter?

According to JGJ104 "winter construction regulations of building engineering", when the outdoor daily average temperature is stable below 5 ℃ for five consecutive days, the winter construction will be entered, and when the outdoor daily average temperature is higher than 5 ℃ for five consecutive days, the winter construction will be canceled.

During the winter construction period, it is possible to encounter severe weather with a sharp drop in temperature such as strong winds, heavy snow, and cold currents at any time. Although the cold weather is short each time, the average temperature drops by about 5 ℃ ~ 10 ℃. This is the key to winter construction. The possibility of problems is the greatest. In order to ensure the quality of the project, reduce the cost, and seek reasonable economic benefits, referring to many years of winter construction experience, when the baseline temperature drops below 4 ℃ in the severe winter season, the construction will be suspended to avoid the cold current, and the construction will be carried out after the temperature rises.

4. When winter comes, the so-called dealers cannot avoid having stocks, but it is always below zero in winter in the northern region. How can they store them without freezing?

The best storage temperature of silicone sealant is: 0~27. Conditional circumstances, can be placed in the same as the structural adhesive in the constant temperature and humidity of the air conditioning room. In addition, the weather sealant construction temperature should not be lower than 4 ℃ or more than 40 ℃.

5. How to avoid the bulging of aluminum plate with weather-resistant glue in winter? Is it better to choose glue with large specific gravity and large consistency?

When the ambient temperature and humidity are low and the temperature difference between day and night is large, it is easier to bulge, especially for aluminum curtain walls. At this time, it is necessary to select an appropriate gluing time period for gluing or choose silicone glue with fast curing speed and low modulus to avoid bulging.

6. Can the external curtain wall be neutralized with silicone weather-resistant sealant in winter?

Acid silicone sealant due to corrosion of metal, coated glass, laminated glass, etc., the scope of application is small. And now on the market neutral silicone sealant is the mainstream, mainly dealcoholization type and deketoxime type two. Neutral silicone weather sealant recommend use temperature is 4-40 ℃/relative humidity is 40-80%, when the temperature is very low, it is recommended to first small area construction, to determine the bonding and curing in good condition, can large area construction.

7. It is understood that removal of oxime is faster than removal of alcohol in winter. Why is it said that removal of oxime is faster than removal of alcohol?

Both dealcoholized and deoximated silicone adhesives have different curing speeds depending on the formulation. Some alcohol-type glue may also cure faster than some oxime-type glue, but in terms of deep curing, oxime-type glue has advantages, so the winter low temperature recommend use oxime-type glue.

However, the sealant curing process will release some small molecules, alcohol-type glue release alcohol substances, less toxic, and oxime-type glue curing release of butanone oxime, the European Union considered that there is a potential risk of cancer, so in use should pay attention to ventilation, to prevent health damage to construction operators.

The above is to bring you some of the precautions for the use of silicone rubber in winter, sealant winter construction needs to be cautious, need to fully consider the impact of temperature and humidity, to extend the curing time.