The difference between platinum vulcanizing agent and platinum catalyst
Platinum vulcanizing agent is also known as platinum water, A/B two-component, it is in the presence of catalyst, hydrogen-containing silicone oil and vinyl double bond undergo hydrosilylation reaction, so as to achieve the purpose of cross-linking vulcanization, platinum vulcanization It is a two-component addition type vulcanizing agent, which has the characteristics of low vulcanization temperature and fast vulcanization speed. Compared with the traditional peroxide vulcanization system, it has the advantages of environmental protection, high efficiency and odorless.


The catalyst is mainly platinum catalyst with precious metal chloroplatinic acid as the main raw material and active component, and the catalyst is colorless, transparent or light yellow liquid. High-efficiency catalyst for simultaneous catalytic curing of liquid rubber, compound rubber (solid rubber) vulcanizing agent and polyurethane coatings and silicone silicone coatings.


1. When using platinum catalyst, the possible problems in the raw materials and the reaction system should be removed first. If the poison cannot be removed from the system, the best choice is to first coat the surface of the substrate containing the poison with hydrogen-containing silicone oil, and then vulcanize it. 2. When using platinum catalyst for the vulcanization of fluid silicone rubber, firstly pay attention to controlling the temperature of vulcanization to prevent the temperature from being too high, because in the high temperature reaction, platinum will be precipitated accidentally, or even more serious, so during the vulcanization process, Strictly control the ambient temperature.


3. During the vulcanization reaction, the catalyst should be added to the material containing unsaturated bonds, and the reactant containing Si—H should be added dropwise to the vulcanization system, or the two reactants should be fully stirred and mixed before adding platinum. catalyst.


4. It is better to have excess amount of substances containing Si-H bonds (hydrogen-containing silicone oil). Because platinum catalyst also contains catalytic dehydrogenation reaction of Si-H bond species. Causes the loss of Si-H bonds, but the ratio of the amount of Si-H bond-containing substances to the bond-containing substances is too large, resulting in a decrease in the elongation of the silicone gel and an increase in the hardness. Generally, the ratio is controlled between 1.2 and 1.4. It is better to control the ratio of silicone rubber between 1.5 and 1.8.


In the selection of chemical additives, platinum catalysts and platinum vulcanizing agents are widely used in metal catalysts and vulcanizing agents. For the theme of protecting the environment, this will definitely become an important trend in the future.