Preface
The prefabricated building is assembled by prefabricated components on the construction site. There are a large number of assembling joints between the components. When the joints encounter earthquakes, wind pressure, etc., it is easy to cause inter-story displacement changes. Under the influence of temperature and humidity , Thermal expansion and contraction, the components are prone to expansion and contraction. This requires the sealant, which is the first line of defense for joint waterproofing, to be able to cope with the deformation of the main structure caused by layer-to-layer displacement, construction errors, and temperature differences.Pustar prefabricated building special sealant series products have reliable bonding performance, excellent sealing and waterproof performance and excellent weather resistance and durability, and their mechanical properties are excellent, low modulus, strong displacement resistance, and can effectively alleviate joints. Stretching stress caused by dimensional changes.
Three major properties
(1) Adhesion
- Cohesive destruction design
In the tensile test, the adhesive with strong bonding performance has a strong bond between the adhesive and the substrate. Excessive tension will only cause the cohesive failure of the adhesive; the bonding interface between the adhesive and the stone is damaged, which proves the adhesive strength of the adhesive to the substrate itself. not enough.
- On-site effect of concrete adhesion
The special sealant for Pustar prefabricated construction has good adhesion, and the interface is not pulled out; the whole strip of poor PC sealant is pulled out, and the adhesion fails.
- Water-immersion bonding
The national standard adhesive glue requirements meet the 4-day waterproof test; pustar prefabricated building sealant still meets the requirements after being immersed in water for 30 days, which can effectively improve the long-term adhesion and extend the waterproof period.
(2) Weather resistance
The retention rate of elongation at break after QUV aging for 3000h reaches the same level as international advanced productsThe elongation at break of the special sealant QUV aging 3000h for Presaida prefabricated building reaches the same level as the international advanced product; the xenon lamp accelerates aging for 4000h without cracking.
(3) Persistence
Pustar products have passed the JC/T 485 9030 weather resistance test: 30% displacement, 2 high and low temperature cycles (90℃x168h, -10℃x24h), then 30% displacement stretch, compression, and cycle 2000 times.9030 weather resistance test.
According to Japanese experience, the sealant generally begins to age in 20-30 years, because the application environment of each project is different, as long as the water resistance is confirmed to be good, you can continue to use it. If the performance is greatly degraded, it needs to be replaced and repaired.
