The role of silicone curing agent
Speaking of curing agents, I believe that many industries are indispensable to use, and they are necessary for the hardening of raw materials. Curing agents, also known as hardeners, curing agents or stabilizers, are a class of substances or mixtures that promote or control the curing reaction. The resin is cured through chemical reactions such as condensation, ring closure, addition, or catalysis, which causes an irreversible change in the thermosetting resin. Curing is accomplished by the addition of a curing (crosslinking) agent. Curing agent is an indispensable additive, no matter whether it is for adhesives, coatings, or castables, the curing agent must be added, otherwise the epoxy resin cannot be cured. The type of curing agent has a great influence on the mechanical properties, heat resistance, water resistance, and corrosion resistance of the cured product.
The former popular silicone trademark LOGO and embossed trademark are mainly based on silica gel. These products are made of two-component liquid silicone, and a certain proportion of curing agent is added to produce a cross-linking reaction and solidify into an elastic solid. material. The amount of curing agent directly affects the curing time and the hardness of the cured silicone. If the curing agent is added too little for a long time, it will not be cured. Adding too much curing agent will affect the hardness, tensile force and tear strength of the silicone. Generally when the embossed product is produced, the curing agent is added in a ratio of 10:1. Keep in mind that it must be stirred evenly and then hot pressed through the laminator, usually heated between 160-200, about 10-20 seconds to cure. After the embossed silica gel has added the curing agent, it will slowly cross-link and cure within 5-6 hours. If silicone is not used up, it will cause waste. Therefore, according to the amount of silica gel to add curing agent to avoid unnecessary waste.
website： jinyumachine.en.alibaba.com
No comments:
Post a Comment