Views: 0 Author: Site Editor Publish Time: 2022-09-02 Origin: Site
1. Q: What is the max temperature of molecular sieve powder in adhesive production? A：Below 500 ℃ is ok, the molecular sieve raw powder will lose crystal water when at 550 ℃. When the temperature reduces to the indoor temperature, it will absorb water to recover. When the roasting temperature reaches 900 ℃, the crystal structure will be damaged and cannot be absorb water again.
2. Q：What is the addition of molecular sieve powder in the polyurethane adhesive ?
A：The addition of molecular sieve powder depends on the trace water that needs to be removed. The static water adsorption rate is 24% of molecular sieve powder .
3.Q: Does molecular sieve powder can be used in Polyol（POP)?
A: Yes, usually the powder used in component A of Two-component polyurethane adhesive (2K-PUR) that includes polyester polyol and polyether polyol.
4 Q: Does the molecular sieve powder will affect the viscosity of adhesive?
A: The powder does not increase viscosity.
5. Q: What is the difference between molecular sieve powder and defoamer?
A: The powder absorbs the excess water in the PU adhesive, and the defoamer is break the bubbles that doesn’t absorb water.