The common one-component silicone adhesives on the market are divided into two types: acidic silicone adhesives and neutral silicone adhesives according to their properties. Acid glass glue is mainly used for general bonding between glass and other building materials; neutral glue overcomes the characteristics of acid glue corroding metal materials and reacting with alkaline materials, so it has a wider range of applications.
1. Neutral silicone glue
Neutral silicone adhesives are divided into alcohol-type silicone adhesives and ketoxime-type silicone adhesives according to the cured products. The main cured products of alcohol-type silicone adhesives are alcohols, and the main cured products of ketoxime-type silicone adhesives are alcohols. It is butanone oxime.
(1) Ketoxime type silicone glue
Ketoxime adhesives are more suitable for industrial bonding, mainly for bonding metal materials, but ketoxime adhesives are corrosive to copper metals.
Advantages: suitable for industrial bonding
Disadvantages: Corrosive to copper metals
(2) Alcohol type silicone adhesive
Compared with ketoxime-type adhesives, alcohol-type adhesives are more environmentally friendly, have no corrosion to copper-containing metals, and have a wider bonding range. At the same time, the price is more affordable, and the deep curing is faster, and it has good adhesion to some common acrylic, wood-plastic boards, plastics and other substrates.
Advantages: environmentally friendly and affordable, wide bonding range
At the same time, the construction of alcohol-based adhesive on the surface of the substrate with too high temperature will cause foaming. Sometimes bubbles are produced when glue is applied in summer, which is because of alcohol-type silicone glue. Since the methanol contained in the alcohol-based adhesive will release gas during the curing process (methanol starts to volatilize at around 50 °C), especially in direct sunlight or high temperature, the reaction is more intense, and concrete and metal window frames are difficult to breathe in summer. If the temperature and humidity are high, the curing will be faster, and the gas released by the glue can only escape from the uncured glue layer, resulting in the appearance of bubbles of different sizes.