April 28, 2024

Have you ever thought about the technological secrets hidden behind those seemingly ordinary sealants and adhesives? Today, let’s talk about this topic – the wonderful transformation journey of DMC, and how it has become an indispensable part of our lives. DMC, the full name is dimethylcyclosiloxane mixture. This organic compound, with its unique chemical structure and properties, plays an important role in chemical industry, medicine, pesticides and other fields. 107 rubber, a silicone rubber material with excellent properties. 107 rubber, the full name is 107 room temperature vulcanized silicone rubber, is famous for its excellent high temperature resistance, cold resistance, weather resistance and ozone resistance. This material plays an integral role in the production of sealants, adhesives and other specialty rubber products. Its wide range of applications, from aerospace to daily consumer products, reflect the importance of 107 raw rubber.

After introducing the two protagonists, how does DMC go through a series of complex chemical reactions and finally transform into silicone rubber with wide application value? This process sounds like a wonderful chemical magic show, but every step is extremely precise and full of technological charm.

1. Raw material pretreatment: Raw material pretreatment is the prelude to this show. Before polymerization, DMC raw materials need to undergo strict dehydration treatment. This step involves adding a certain amount of water to the raw material and heating it under specific temperature and vacuum conditions so that the water is converted into steam and removed. During this process, chloride ions and trifunctional impurities are also removed, ensuring efficient polymerization.

2. Catalyst selection and proportioning: Choosing the appropriate catalyst plays a decisive role in the efficiency of the polymerization reaction and the quality of the final product. Catalysts such as potassium hydroxide are usually used, and their addition amount is strictly controlled, ranging from 5 to 200 ppm in the reaction system. The type and amount of catalyst directly affect the polymerization rate and product performance.

3. Polymerization reaction environment setting: The polymerization reaction must be carried out in an anhydrous environment, the temperature is controlled between 85°C and 95°C, and the vacuum degree is maintained at -0.085MPa to -0.095MPa. Under these conditions, DMC, VMC and other additives polymerize under the action of catalysts to generate silicone rubber.

4. Neutralization and low-molecular removal: After the polymerization is completed, a neutralizing agent, such as 80%-85% phosphoric acid aqueous solution, is added in an amount of 30-200ppm of the system to neutralize the catalyst in the reaction system. Subsequently, low molecular substances are removed in the temperature range of 140°C to 190°C, and the vacuum degree is controlled at -0.095MPa to -0.1MPa to ensure the purity of the product.

5. Fine control of product characteristics: By adjusting polymerization conditions, silicone rubber with different molecular weights can be prepared to adapt to different application scenarios. At the same time, the physical properties such as plasticity, relative density, and hardness of the product need to be precisely controlled to meet specific needs.

After getting the magical silicone rubber, we can apply it to various fields! For example, it can be used to make silicone rubber products with excellent properties such as high temperature resistance, cold resistance, weather resistance, and ozone resistance. Of course, we also need to pay attention to some things during storage and use! For example, avoid prolonged exposure to sunlight, store in a cool, dry place, and seal. The above is all about how the silicone monomer DMC turns into silicone rubber! Welcome to follow our website for more interesting chemistry knowledge!