The use and Disadvantages of polyurethane sealant
The use of polyurethane sealant:
Polyurethane sealant is mainly used for sealing of passenger car air conditioners, welds, trunks, etc., and sealing and low-strength bonding in ships, locomotives, construction, painting and other industries. Joint filling of passenger car interiors, locomotives, containers, cold storage, ships, etc. Ship interiors, decks, welds and pipes, building waterproofing, dust-proof joint sealing. Polyurethane sealant can also be used for flexible joints of cables (such as underground cables), potting of electronic components, and dustproof and shockproof; for bonding and sealing of heat insulation systems such as refrigerated trucks, cold storage insulation and cryogenic vessels.
Disadvantages of polyurethane sealant:
1, can not be long-term heat.
2. Light-colored formulas are susceptible to UV light aging.
3. The storage stability of single-component adhesives is greatly affected by packaging and external influences, and usually curing is slow.
4. Bubbles and cracks may occur in high temperature environments.
5, many occasions need primer.
6. At the same time, the polyurethane sealant has poor water resistance, especially the alkali-resistant water.