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First, we need to understand what two-component silicone rubber is. Two-component vulcanized silicone rubber is a common type of vulcanized silicone rubber; its raw rubber is usually hydroxyl-terminated polydimethylsiloxane. The produced silicone rubber products are packaged into two parts: rubber and catalyst. When used, simply mix the rubber and catalyst evenly in a certain proportion. Today, we are talking about the proportion of this catalyst.

Generally, manufacturers of silicone rubber will provide product instructions, telling you the proportion of the catalyst to use. When using it, we must follow the instructions and be accurate when weighing. Avoid using inaccurate measuring tools, and definitely do not use the catalyst based on "estimation".

If the proportion of the catalyst is inaccurate, several problems will generally occur: First, the operation time and vulcanization time will be affected. For example, if too much catalyst is added, the operation time will be greatly shortened, affecting the operation and construction, and also affecting the product quality. If too little catalyst is used, vulcanization will be slow, wasting time, and even incomplete vulcanization will directly lead to product waste. Second, it will cause uneven curing.

When using silicone rubber, it is also necessary to consider the influence of environmental factors on the curing agent ratio, such as the same silicone rubber needs to consider different temperature conditions in winter and summer. Taking Jerry silicone rubber as an example, the ratio generally written in the instructions is tested at an ambient temperature of 25 degrees Celsius and a humidity of 65 degrees. In short, for example, if the catalyst ratio is 2-3% at 25 degrees, then at around 10 degrees, the curing agent ratio needs to be increased to 5%; if the ambient temperature reaches 38-45 degrees, only about 1% of the catalyst is needed. If the ambient temperature reaches minus 5 degrees, the curing agent and rubber will no longer react; if they need to continue to react, external heating is required. Humidity can also affect the proportion of the curing agent, but because the effect is small, it is only considered in places with very precise requirements.

Due to many influencing factors, we will encounter some difficulties when choosing the proportion of the curing agent. However, if we can reasonably utilize the relationship between the chemical reaction of the curing agent and the rubber and reasonably adjust the proportion of the curing agent, it can also bring some convenience to our production process. To give a simple example, when conditions do not permit vacuum treatment of the silicone rubber, we can appropriately reduce the proportion of the catalyst to slow down the reaction speed of the silicone rubber to achieve the effect of removing air bubbles. The above only briefly mentions several problems related to the curing agent ratio; many aspects have not been covered, and everyone is welcome to add to them.