Causes and solutions for brittleness or cracking of thermal insulation glue

Note: This article was written by Shanghai Weigu Chemical Products Co., Ltd. Copying without permission is strictly prohibited!

The thermal insulation glue of broken bridge aluminum profiles becomes brittle or cracked, mainly due to the following reasons:

1. Cause1:Actual measurementB glue /A glue is higher than the theoretical range, that is, the isocyanate component is excessive.

Solution: Before each shift of glue injection, test whether the glue proportion is in line with the normal proportion range of the manufacturer’s glue. If not, check whether it is a problem with the synchronous pulley, or whether the maintenance equipment pipeline is blocked.

2. Causes 2: Low-temperature process (below18℃), insufficient preheating.

Solution: Temperature control, control the temperature of the environment and materials to reach 20℃ or above, preheat before going to work, and turn on the air conditioning and equipment heating and circulation functions in the workshop in advance.

3. Causes3:Inject glue and cut the bridge first. Some workshops are very small and do not have enough space for a cooling bed to place the glued profiles. Some people are accustomed to placing the profiles that are glued later on the upper floor and move them to cut the bridge first. This creates a situation where glue is injected first and then cut. bridge. However, there are problems with this process and it is not allowed in the industry. The profile that is first injected with glue must be cut first.

Solution:Increase the interval between cutting and bridging, and perform bridging after more than 30 minutes, or the hardness reaches above 65D. Or improve the layout of the workshop and improve the situation where the bridge is cut after the glue is injected.

4. Causes4:Warehousing, that is, the problem of handling and stacking. It is also related to the temperature. When the temperature is too low and the hardness does not meet the requirements, the bridge must be transported and stacked after cutting. This has a lot to do with the maintenance interval.

Solution: After the profile is packaged, it must be maintained at least in the warehouse8 hours or more than 12 hours, it is recommended to maintain between 12 and 24 hours. If the profiles are filled with glue in the morning and shipped in the afternoon in a low-temperature environment in winter, the glue will easily become brittle or crack.

5. Causes5:The mixing is uneven and the colloid cracks. Because some manufacturers’ equipment uses a hydraulic system to control the mixing speed, if the mixing speed is not displayed on the equipment, and if the pressure valve is manually operated by mistake, the mixing speed will be much slower and the glue will be unevenly mixed. The light is relatively dark and people do not observe the surface of the colloid. At this time, the colloid has cracks, and it will definitely crack after being shipped from the factory.

Solution: Increase the appearance of quality inspection. If there is quality inspection for every batch and the quality inspection department performs frequent inspections, this problem will not occur.

Shanghai Weigu adheres to advanced European technology and has decades of production experience and technology accumulation. European technology and imported equipment ensure the consistent and stable quality of the company’s productse. Weigu aluminum profile insulation glueis Two-component polyurethane elastomer materialAs a thermal insulation material, polyurethane can provide excellent thermal insulation solutions for buildings. The various properties of aluminum profile insulation glue products fully meet the requirements of the existing national standards. Weigu aluminum profile thermal insulation glue is waterproof and moisture-proof, green and environmentally friendly, UV resistance, good heat insulation and energy saving effect, good earthquake resistance, excellent mechanical properties, high production efficiency, saving the amount of aluminum used in door, window and curtain wall aluminum profiles and other excellent characteristics.