Car windshields are very important to the safety of cars. When a collision occurs, the car windshield will absorb huge impact force and must be firmly bonded to the car body and cannot fly off the car body. This places high demands on the sealant between the car windshield and the car body. Polyurethane sealant has become an important product in the automotive sealing industry. According to statistics, private cars and high-end buses all use polyurethane sealant as a sealing material for automotive glass and body. So, how did polyurethane sealant become the safety key for automotive sealing?
1) Requirements for car windscreens sealant:
- High strength, tear resistance
- Weather resistance, aging resistance
- Simple construction, fast curing
- Good collapse resistance, no sagging
- Elastic sealing, short displacement time
2) Comparative test of multiple sealing materials
Common sealing materials for windshields mainly include traditional rubber strips, polysulfide sealants, silicone sealants, and polyurethane sealants. After comparing multiple factors, the results of various materials are as follows:
1. Traditional rubber strips
Poor sealing ability, easy to deform during long-term use, need frequent replacement, and relatively high cost
2. Polysulfide sealant
High viscosity, difficult to install, strong odor, no longer suitable for automotive sealing
3. Silicone sealant
Good weather resistance and durability, wide adhesion, low tensile strength, but relatively high price,
4. Polyurethane sealant
It is widely used in car body metal bonding. After curing, it provides a permanently elastic bond to fasten materials to the car’s framework. It’s water-proof, aging-resistant, flexible, and has good bonding performance.
3) Construction method of polyurethane sealant
Good construction is an important guarantee for the excellent performance of sealant. Before applying the sealant, workers needs to the adhesion test between the sealant and the substrate to ensure the bonding effect.
1. Surface cleaning: improve the adhesion between the polyurethane car windscreens sealant and the substrate.
2. Applying primer: improve the adhesion between the polyurethane sealant and the substrate.
3. Gluing and installation: Before applying the sealant, cut the nozzle into a triangular opening with a knife. The inner diameter of the glue nozzle should be determined according to the bonding design width.
4) Automotive sealant solution
TP701 Polyurethane Sealant for windshield is one component, moisture-curing, non-sag, fast cure polyurethane sealant for windshield.
- One component, moisture-curing, non-sag, fast cure polyurethane sealant for windshield.
- Excellent adhesion
- Fast cure
- Low odor
TP702 Polyurethane Sealant for windshield is one component, moisture-curing, non-sag, fast cure polyurethane sealant for windshield.
- Ahigh-performance, flexible, joint-filling one-component polyurethane window glass sealant that reacts with moisture to form a permanent elastomer.
- One-component structure
- Low volatility
- Excellent construction characteristics
- Fast curing
- Anti-aging and weathering
- The same applies to manual operations and large packaging.
TP703 Car body polyurethane sealant is a single-component PU sealant. It can be widely used in car body metal bonding. After curing, it provides a permanently elastic bond to fasten materials with the framework of car. It’s water-proof age-resistance, solf and good bonding performance.
- Neutral, no pollution and curing under normal temperature.
- Excellent durability.
- High abrasion resistance and tear strength.
- Good weathering and water resistance.
- Good slump resistance, non-sag.
- Apply directly on site, no need mix.
- Can be painted, good compatibility with paints.
- No corrosion.