Polyurethane sealant has three types: heating vulcanization type, hot melt type and room temperature vulcanization type. It is a kind of sealant that is widely used now. It is mainly used for bonding and sealing, mainly for construction. goods, automobile manufacturing, etc. Polyurethane sealant has many advantages, but also has certain disadvantages. The following is a detailed explanation of the advantages and disadvantages of polyurethane sealant.
What are the advantages of polyurethane sealant:
Polyurethane sealant has good elasticity and stretchability, and is wear-resistant, cold-resistant, oil-resistant, etc. Therefore, polyurethane sealants are widely used in construction, electronics, transportation, etc.
Advantages 1. Polyurethane sealant is a single-component coating with strong tensile strength, high stability, low odor, and relatively small environmental pollution. It is a new environmentally friendly material.
Advantages 2. Polyurethane sealant has high thixotropy. Even when used on an upright surface or on top, it will be very stable and will not flow, affecting the use effect.
Advantage 3. Polyurethane sealant is wear-resistant, cold-resistant, and non-corrosive to other materials, so polyurethane sealant can be used on most materials.
Advantage 4. The surface of polyurethane sealant can be painted, polished, etc., which will not affect the effect of polyurethane sealant.
Advantage 5. Polyurethane sealant has strong aging resistance, so its service life can be as long as 15 to 20 years.
Advantage 6. Polyurethane sealant can bond objects of various materials and can even be used to bond food. Therefore, polyurethane sealant is widely used.
What are the disadvantages of polyurethane sealant:
Everything is double-sided. If there are advantages, there will be disadvantages, and polyurethane sealant is no exception. Polyurethane sealant is not heat-resistant, so if it is exposed to ultraviolet rays for a long time, it will accelerate the aging of the polyurethane sealant. Even in high temperature environments, cracks and other conditions may occur.
Disadvantages 1. It is not heat-resistant and cannot be exposed to high temperature for a long time. Otherwise, it will affect the time effect and appear cracks, bubbles, etc. Long-term exposure to ultraviolet rays will also affect the life of the time.
Disadvantage 2. When using polyurethane sealant in some situations, a primer is required and cannot be applied directly.
Disadvantage 3. The water resistance of polyurethane sealant is also relatively poor, especially the alkali resistance. If it is used in an alkaline environment, it will greatly affect the use effect.
What are the uses of polyurethane sealant:
The main uses of polyurethane sealant are in civil construction and transportation: sealing of doors and windows, pasting of curtain walls, waterproofing of balconies, swimming pools and bathrooms Caulking, sealing of double-sided glass; sealing of automobile windows, bonding of automobile parts, etc.