Neoprene sealant is one of the commonly used weld sealants in automotive sealing. This sealant is a one-component solvent-based sealant made with chloroprene rubber as the main material and tert-butyl phenolic resin as the tackifier. It has good adhesion to various metal materials, coated steel plates and non-metallic materials. The cured film is water-resistant and aging-resistant, and has good sealing effect.

Neoprene sealant is usually packaged in a single component, such as a toothpaste tube or a glue gun barrel. When used, apply the sealant along the weld and then use a scraper to smooth it. It is suitable for models with a coating drying room temperature below 120°C. Or used in auto repair shops. Neoprene sealant is widely used in my country's bus manufacturing industry because it is a single component, does not require on-site mixing, can simplify the process, avoid material waste, and is relatively inexpensive. This type of chloroprene rubber sealant is used in the body welds of the Shenfei brand ordinary buses produced by Shenyang Shenfei Bus Company and in the seals between the body frame and the outer skin. The Huanghai brand buses produced by Dandong Automobile Factory also have this glue applied on the welds inside the vehicle and on the skin to achieve the sealing of the welds. The applied glue layer can solidify at room temperature after the solvent evaporates.

Because single-component chloroprene rubber sealant contains solvents, its volume shrinkage rate is relatively large after curing. If the solvent is not completely evaporated, bubbling may occur during the heating and drying process. Therefore, if chloroprene rubber sealant is used in the seams of the vehicle body's outer skin, it is required that the volume shrinkage rate after curing is low to avoid causing dents in the seal and affecting the smoothness of the appearance. In addition, there should be no flowing or bubbling during drying, and the coating should have good bonding strength. The more anti-condensation paint, the less likely the paint film will crack or peel off.

Neoprene has been around for more than 60 years. Due to its excellent performance, wide application range and relatively low price, it has always been popular. No other adhesive can completely replace it, and it still has great potential for development. Traditional solvent-based chloroprene rubber accounts for the largest proportion, with high solvent content, benzene solvents are the most used, and are the most harmful to health and the environment. With the continuous enhancement of people's environmental awareness and the improvement of national environmental protection laws and regulations, toxic and harmful solvent-based chloroprene rubber has been subject to certain restrictions. Water-based chloroprene adhesive does not use organic solvents, has no environmental pollution, health hazards and fire hazards, and represents the development direction of chloroprene adhesive. However, due to its shortcomings such as slow drying speed, low initial adhesion and easy freezing at low temperatures, its development is very slow and its application is limited. Limited field. Solvent-free chloroprene rubber has no outstanding performance and is very expensive, so it has not been developed. From a practical point of view, solvent-based chloroprene adhesive has always been in a dominant position, and it is difficult to change for quite some time, because it has unique advantages in bonding strength, drying speed, and wide range of applications. The research and development and application of water-based chloroprene rubber must be accelerated. For chloroprene sealants, since the solvent does not need to evaporate too quickly, methyl isobutyl ketone, butyl acetate, ethyl lactate, turpentine, etc. can be used instead of toluene and xylene. In short, if chloroprene rubber is to continue to develop, it must achieve environmental protection, accelerate water-based development, promote high solid content, and research high performance.