Liquid Silicone Knowledge

- May 12, 2020-

Liquid silicone introduction:

  Liquid silicone is also called liquid glue, which has the characteristics of good fluidity, fast vulcanization, safety and environmental protection, etc. It fully meets the requirements of food grade. According to the position of the functional group (ie, cross-linking point) contained in the molecular structure, the liquid silica gel with functional group is often divided into two categories: one is the remote claw type liquid rubber with the functional group at both ends of the molecular structure; the other is The active functional groups are randomly distributed in the main chain, that is, those with so-called functional groups in the molecular structure are called non-telechelic liquid rubbers.


Liquid silicone characteristics:

  Liquid silicone has excellent transparency, tear strength, resilience, yellowing resistance, thermal stability, water resistance, good breathability, heat aging resistance and weather resistance, while the viscosity is moderate, easy to operate, and the product has high transparency and can be Seeing whether the casting material in the mold has defects such as bubbles, the linear shrinkage rate is ≤0.1%, and the size of the copied product is precise.

Liquid silicone use:

  Liquid silicone rubber can be used for trademarks, products, pacifiers, medical supplies, coating, dipping and perfusion. Silicone products such as crystal mold, polyurethane, epoxy resin and other molds, injection molding processes, cake molds, etc., are widely used in the electronics industry as moisture-proof, consignment, insulation coating and potting materials for electronic components , Play a role of dust, moisture, shock and insulation protection for electronic components and assemblies. If the transparent gel is used to encapsulate the electronic components, not only can it play a role in shock and waterproof protection, but also you can see the components and use the probe to detect the failure of the component and replace it. The damaged silicone gel can be encapsulated again. repair. It can also be used to make gypsum, wax, epoxy resin, polyester resin, polyurethane resin and low melting point alloy product forming molds, used in high-frequency embossing of artificial leather, shoe surface and bottom modeling, arts and crafts manufacturing, Reproduction of ceramics, toy industry, furniture, household appliances and electronic components, molding of gypsum and cement materials, molding of wax products, manufacturing of models, molding of materials, etc.

Liquid silicone type:

  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 flow (no manual processes such as batching, rubber mixing, cutting, and trimming in the high-temperature glue process are required, only one worker can take the product), and the product accuracy is high (all manual procedures before molding) All are replaced by machines), high output (A / B glue is mixed and formed at a certain temperature for a few seconds), saving people, electricity, materials and other advantages, can produce all products produced by high temperature glue! Is the mainstream of the development of silicone rubber materials in the next few years.

  2. Mould Silicone Rubber (RTV-2): used for crafts and low alloy forming molds.

  3. Electronic Silicone Rubber (RTV-T): used for moisture-proof, insulated backlight board and heat dissipation material for electrical components.

  4. Sealant (RTV-1): Commonly known as glass glue, it is used for building sealing, waterproof engineering, aluminum bonding, electronics and lighting.

Liquid silicone packaging transportation and precautions:

  Component A 20Kg per barrel, component B 1Kg per bottle, or component B 20kg / barrel, or packaged according to user needs. Transported as non-dangerous goods.

  Liquid silicone can be stored for 6 months at room temperature. During use, water, impurities, organic tin catalysts of condensed silicone rubber, acids, alkalis, and other organic compounds containing sulfur, phosphorus, and nitrogen may affect the curing of the glue. Impurities.