Single component moisture cured polyurethane sealant for windshield assembly

Polyurethane SealantThe sealant used in the automotive industry should generally have a high and long-lasting adhesive strength, and is therefore sometimes referred to as adhesive and/or structural adhesive. Some people believe that this adhesive with dual functions of bonding and sealing can be called "sealant/adhesive".

Polyurethane sealant has good physical properties and durability, strong adaptability to the adhesive material, and can have operability and curing speed suitable for automotive rapid assembly production lines. It has been widely used in the assembly and sealing of windshields, the assembly of car bodies and other components, and the sealing and bonding of collision bars, headlights, rear doors, etc. in countries with developed automotive industries, making these component joints have anti rust, waterproof, dustproof, earthquake resistant and reinforcing effects. The type of adhesive used There are single component and two-component. Some parts, such as the engine hood and luggage compartment, use two-component adhesives with bonding functions far superior to sealing. Epoxy resin adhesive belongs toStructural adhesiveThe following introduces the dominant polyurethane sealant in automobile manufacturing - single component moisture cured polyurethane sealant for windshield assembly.

In order to improve the bonding effect of the sealant, a primer is generally applied in advance on the side of the glass and window frame that comes into contact with the sealant.

1. Civil engineering and construction industry

There are single component and two-component types of polyurethane sealants used in civil engineering and construction. AB glue is easy to operate because it does not need to be mixed during use; The two-component sealant has a large degree of freedom in selecting physical properties and curing speed, but the disadvantage is that due to the high viscosity of the sealant, specialized mixing equipment is required, which is labor-intensive and time-consuming, as the two-component must be mixed evenly. In construction applications, the amount of two-component polyurethane sealant used is greater than that of single component.

2. The occasions where polyurethane sealant can be used include:
① Sealing of horizontal and vertical joints between concrete panels in the main structure of the building and filling of gaps;
② Sealing of gaps between the perimeter of residential door and window frames and concrete or brick walls;
③ Sealing of joints at building curtain walls, toilet ancillary equipment, etc;
④ Sealing and leakage prevention of roof gaps, filling of floor gaps, and laying of floor tiles;
⑤ Sealing of all joints in air conditioning and ventilation systems;
⑥ Adhesive sealing of various material pipe joints in the water supply and drainage system;
⑦ Sealing of pipeline joints and leaks in the gas supply system;
⑧ Sealing of joints between concrete panels in subways and underground tunnels;
⑨ Sealing glue for laminated glass and sealing glue for insulated window frames;
⑩ Sealing and sealing of expansion gaps in highways, bridges, airports, and other areas.