Liquid Silicone Rubber is compared to solid high-temperature vulcanized silicone rubber. It is a liquid rubber with good fluidity, fast vulcanization, safer and environmentally friendly, and can fully meet food-grade requirements.

Overview of liquid silica gel

According to the position of the functional groups (i.e. cross-linking points) contained in the molecular structure, liquid rubber with functional groups is often divided into two categories: one is functional groups Those at both ends of the molecular structure are called telechelic liquid rubber; the other type has active functional groups randomly distributed in the main chain, that is, those with functional groups within the molecular structure are called non-telechelic liquid rubber. Of course, there are also those with both intermediate functional groups and terminal functional groups. The current focus is on research on telechelic liquid rubber. For liquid rubber, chain extenders or cross-linking agents with appropriate functional groups should be selected based on the reactive functional groups they contain.

Liquid silicone rubber can be used for coating, dipping and pouring. For example, hydroxyl-terminated polymethylsiloxane with a viscosity of 0.07~50 Pa·s/25°C uses methylvinyl bispyrrolidone silane as the chain extender and organic peroxides, such as dibenzoyl peroxide, 25-dimethyl-5-di-tert-butylperoxyhexane is used as the vulcanizing agent. This rubber has good fluidity and low viscosity. During the vulcanization process, a chain growth reaction occurs simultaneously, so a high molecular weight elastomer can be obtained. Has good physical and mechanical properties. The chain extender methylvinyl bispyrrolidone silane can be obtained by reacting pyrrolidone and methylvinyldichlorosilane in the presence of triethylamine. The product is easily hydrolyzed, so it needs to be stored in a dry and airtight container. The pyrrolidone of this compound The hydroxyl group can react slowly with the terminal hydroxyl groups in polydimethylsiloxane at room temperature, and the reaction rate accelerates as the temperature increases. Theoretically, this reaction can proceed continuously until infinite molecular weight is obtained. The vinyl group in methylvinylpyrrolidone silane can also be used as an activation point for the vulcanization reaction, which can promote the cross-linking of polydimethylsiloxane to generate high molecular weight elastomers. Since the pyrrolidone group and the hydroxyl group react very slowly at room temperature, the compound after adding each component and mixing has a longer pot life. The viscosity of the compound remains basically unchanged within 1 hour, but it still maintains good fluidity. Can be injected into tiny pores. The mixed rubber can be vulcanized into an elastomer by heating it at 150°C for 10 minutes.

1. Injection molding liquid silicone rubber (LSR): the full name is injection molding liquid silicone rubber, and the vulcanization equipment is an injection molding machine. The injection molding machine has a very simple process (no manual processes such as ingredients, mixing, cutting, and placement of materials in the high-temperature glue process are required, only one worker is required to take the product), and the product is highly accurate (all manual procedures before molding are required) All replaced by machines), high output (A/B glue is mixed at a certain temperature and formed in a few seconds), saves manpower, saves electricity, saves materials and many other advantages, it can produce all products produced with high-temperature glue! It will be the mainstream development of silicone rubber materials in the next few years.

2. Mold silicone rubber: used for crafts and low alloy forming molds. (RTV-2)

3. Electronic silicone rubber: used for moisture-proof, insulating backlight panels and heat dissipation materials for electrical components. (RTV-T)

4. Sealant (RTV-1): commonly known as glass glue, used for building sealing, waterproofing projects, aluminum bonding, electronics and lighting, etc.

Uses of liquid silicone

Liquid silicone rubber can be used for trademarks, products, pacifiers, medical supplies, coating, dipping and perfusion, etc. It is used in molding molds for crystal glue, polyurethane, epoxy resin, etc., injection molding processes, cake molds and other silicone products. It is widely used in the electronics industry for moisture-proof, smuggling, insulating coating and potting of electronic components. Materials that protect electronic components and assemblies from dust, moisture, shock and insulation. If you use transparent gel to encapsulate electronic components, it can not only provide shockproof and waterproof protection, but you can also see the components and use probes to detect component failures and replace them. The damaged silicone gel can be encapsulated again. repair. It can also be used to make product molding molds for materials such as gypsum, wax, epoxy resin, polyester resin, polyurethane resin and low-melting point alloys, and is used in high-frequency embossing of artificial leather, upper and sole modeling of shoes, and manufacturing of arts and crafts. Ceramics, toy industry, furniture, household appliances and electronic components industry reproduction, as well as the molding of plaster and cement materials, the molding of wax products, the manufacturing of models, the molding of materials, etc.

If necessary, you can contact Haiyue Silicone. They have been focusing on liquid silicone for 16 years and are trustworthy!