The full name of polyurethane foaming agent is one-component polyurethane foam caulking agent, commonly known as foaming agent, styrofoam, and PU caulking agent.
A cross-bonded product of urethane foam technology. So how do we judge the quality of polyurethane foaming agent in daily life?
Do you know the performance of polyurethane foaming agent?
1. Performance description of polyurethane foaming agent
General surface drying time is about 10 minutes (at room temperature 20°C), and Drying time varies with ambient temperature and humidity, generally
Under normal circumstances, the dry time in summer is about 4-6 hours, and it takes 24 hours or more to dry in winter when it is around zero. under normal conditions of use
Under the environment (and when there is a covering layer on its surface), it is estimated that its service life is not less than ten years, and it can be cured in the temperature range of -10°C to 80°C
The foams all maintain good elasticity and cohesive force. The cured foam has the functions of caulking, bonding and sealing. Another flame retardant polyurethane
Ester blowing agent can achieve B and C class flame retardancy
.
Second, the method of judging the quality of polyurethane foaming agent
1. If it is a gun-type polyurethane foaming agent, you can see the effect of the gun. When foaming, the sprayed foam should be smooth, not too thin or too thin
Thick, too thin, the foam will not be big, and it will collapse, too thick, the foam will dry out, and the foam will shrink easily;
2. Put the polyurethane foaming agent on the newspaper, make a layer, and the second Check to see if the two ends of this layer of foam are warped, if warped, it means the foam is closed
If the two ends are not lifted, the foam is good;
3. Cut the foam and see the cells. The cells are uniform and fine, which is a good foam. If the cells are very
4. Look at the foam surface of the polyurethane foaming agent. The surface of good foam is grooved, smooth but not very bright; the surface of poor foam is flat.
Whole, wrinkled;
5. Look at the foaming size of the polyurethane foaming agent. Good foams are full and round; poor foams are small and collapsed;
6. Press the foam with your hands, if the foam is elastic, it is a good foam; the poor foam has no elasticity;
7. Look at the adhesiveness of the polyurethane foaming agent, good foam has strong adhesive force, Poor ones have poor adhesion.
