With the development of the automotive industry, the application of single-component room temperature moisture-curing polyurethane adhesives in the automotive sector is becoming increasingly widespread. Besides excellent bonding strength and impact strength, single-component room temperature moisture-curing polyurethane adhesives also possess characteristics such as aging resistance, low-temperature resistance, fatigue resistance, water resistance, and oil resistance, with low-temperature resistance and oil resistance being particularly outstanding. Furthermore, they are easy to use, have high bonding strength, and good build-up properties, making them the most ideal adhesive and sealing material for bonding structures used in the assembly of vehicle windows and body panels.

In automotive production, the use of adhesive structures in the assembly of vehicle windows and body panels not only simplifies construction and enhances sealing, reduces vibration, but also improves the overall rigidity of the vehicle body. More than 95% of foreign automakers use direct bonding processes for vehicle windows using polyurethane as the adhesive. In my country's automobile production, the main manufacturers using this process for window glass assembly include Audi, Hongqi, Jetta, A4, Buick, Santana 2000, Passat, Honda, Xiali, Fukang, Cherokee, and luxury buses produced by Ankai, Tianjin Yilisha, Xiwo, and King Long. Minivans produced by Hafei and Jilin Light Industry also use this process. For other body parts such as body panels, luggage compartment panels, and front and rear panels, the use of polyurethane as an adhesive is primarily found in luxury buses.

▶ Physical properties of automotive glass sealant

▶ Product construction method:

(1) Shake the unopened glass/finish base glue for more than 5 minutes.

(2) Clean the area to be coated with glass cleaner on the car window glass, and let it dry for more than 5 minutes; clean the area to be coated on the car window frame with a clean fabric.

(3) Apply the glass/finish base glue evenly on the desired coating surface of the car window frame and glass using a brush or a paintbrush. The coating thickness should be 8 to 20 μm, and let it dry for more than 5 minutes.

(4) Use a screwdriver or other tools to pierce the nozzle of the glue cylinder. Cut the plastic nozzle into the shape shown in Figure I, and tighten it on the nozzle of the glue cylinder. Pull up the pull ring of the bottom cover of the glue cylinder, remove the bottom cover, and install it into the caulking gun.

(5) If using a mechanical hand for caulking, insert the 200L glue barrel into the caulking machine and the mechanical hand's glue outlet according to the instructions in the barrel, cut the plastic nozzle into the required shape, and adjust the mechanical hand's trajectory.

(6) Use the caulking gun or mechanical hand to apply the glass glue to the coated area on the car window frame or glass. The shape cross-section of the rubber strip is triangular, or the rubber strip can be made cylindrical according to the construction process requirements.

(7) After coating the glass, the car window glass should be assembled immediately. The assembly should be completed no later than 15 minutes onto the car window frame, adjust the gap, and try to avoid moving the position. Then, fix the glass with pressure-sensitive adhesive tape or other fixtures.

(8) The coated and bonded workpieces generally reach a certain strength after 8 to 12 hours. Before this, it is strictly prohibited to apply other deformation forces to the workpieces.

(9) Pressure-sensitive adhesive tape or fixtures can generally be removed after 24 hours of bonding.

(10) The construction environment temperature should be above 24°C, and the relative humidity of the air should be between 55% and 80% RH.

▶ Applications on the car:

1. Bonding and sealing of the windshield and side window glass

Modern cars are moving at higher and higher speeds, and the area of each single window glass has increased, and air conditioning is commonly installed. Therefore, the requirements for the safety and sealing performance of the window glass have been increasing day by day. By using TOCOCOLL F500 for direct bonding of the window glass, the safety of the car has been improved, the safety of the passengers has been guaranteed, and the passengers have been protected from being injured due to loose window glass assembly when the car brakes suddenly or crashes at high speed. At the same time, this assembly process makes the window glass and the body of the car become an integral whole, greatly strengthening the rigidity of the body, increasing the bonding force between the glass and the body, and improving the sealing effect of the window.

2. Bonding of the front and rear steel panels

The front and rear steel panels of the bus are made of fiberglass material. This not only improves the corrosion resistance of the body but also reduces the weight of the body. Using TOGOCOLL F500 for direct bonding reduces vibration and noise, ensures sealing, and can evenly distribute stress, maintaining a smooth and flat appearance, and not damaging the structure of the fiberglass. Moreover, it makes the front and rear panels become an integral part of the body, enhancing the rigidity of the body.

3. Bonding of the body panels

When assembling the body (side panels) using welding, riveting, etc., mechanical locking methods, there will be many pits (welding points) caused by welding or protrusions (rivets) caused by riveting on the surface of the body panels. Repairing them is time-consuming and labor-intensive. Especially when using coated steel plates, the welding point damages the coating structure, reducing the corrosion resistance of the body panels. However, using TOGOCOLL F500 for direct bonding of the body panels makes the construction simple, with a wide range of materials (such as painted thin steel plates, galvanized plates, thin aluminum plates, etc.) not only reduces the weight of the body, reduces vibration and noise, improves the sealing effect, but also makes the appearance of the body panels smoother, flat, and more beautiful. At the same time, TOGOCOLL F500 after curing has certain elasticity, high bonding strength, excellent anti-twisting performance, and by bonding, the body panels are integrated with the body, enhancing the body rigidity and improving the safety of the bus in high-speed driving.

4. Bonding of luggage compartment panels and door panels

Luggage compartment panels and door panels are bonded using the direct bonding process of TOGOCOLL F500, ensuring the sealing of the body, reducing vibration and noise, and improving the overall rigidity.

5. Bonding of the roof cover

The roof cover and body panels belong to the outer skin of the body (side panels), and the effect of bonding with TOGOCOLL F500 is basically the same as that of the body panels. For example, if the roof cover is made of fiberglass material, it can also be bonded with TOGOCOLL F500. This will further reduce the weight of the body, enhance the corrosion resistance, improve the sealing effect, and increase the beauty of the body panels.

6. Bonding of interior components

The bonding of interior components mainly uses products such as TOGOCOLL D500 or TOGOCOLL F500, which can be used for the floor, luggage compartment. Bonding of the roof and front and rear panel interiors, etc.

7. Sealing of welds and seams

The quality of welds and seams directly affects the sealing and rust resistance of the body. Using TOGOCOLL D500 or TOGOCOLL F500 for direct bonding can not only seal and prevent leakage, enhance the rust resistance of the body, increase the service life of the body, postpone the scrap time, but also fill in the welds and seams, increasing the beauty of the body.

8. Bonding of painted metal parts and plastic parts

For some parts that are not suitable for welding or riveting, the direct bonding process of TOGOCOLL D500 or TOGOCOLL F500 can be used. This is both beautiful and simple.

▶ Transportation and Storage:

This product should be protected from direct sunlight and rain during transportation. Handle with care during transport and loading/unloading to avoid violent collisions that could deform or damage the packaging, affecting the product's storage and performance.

This product should be stored in a dry, well-ventilated warehouse. The shelf life is nine months from the date of production. After the shelf life, a retest should be conducted according to these regulations. If the retest results are satisfactory, the product can still be used. This product is non-toxic, non-flammable, and non-hazardous.

▶ Application Scenarios:

Suitable for sealing and waterproofing automotive windshields, sunroofs, rearview mirrors, etc.