Excellent Properties and Applications of Liquid Silicone rubber

Liquid silica gel has excellent transparency, tear resistance, resilience, yellowing resistance, thermal stability, water resistance, good breathability, heat aging resistance, and weather resistance, as well as moderate viscosity, good fluidity, convenient operation, and high transparency of products
Latest Application and Development of Liquid Silicone Rubber

In recent years, the liquid rubber injection molding method (LIMS), that is, the injection molding of liquid silicone rubber, has been widely popularized and promoted. Recently, this method has the advantages of being able to perform short-term automatic molding and composite molding with plastics. The following will introduce the latest trends in liquid silicone rubber injection molding and the materials suitable for this molding method.

1. Liquid Injection Molding of Silicone Rubber
The liquid silicone rubber injection molding method, which started in the 1970s, has gradually become popular. Today, as a molding method for silicone rubber, it has been recognized. First, the commonly used LIMS method is described.

To explain LIMS (Liquid Silicone Rubber Injection Molding) in one sentence is to use a pump to transport the added solidified liquid silicone rubber into an injection molding machine and solidify it in a mold. From the differences in the process flow and curing reaction of these two methods, the advantages of LIMS are as follows:
(1) Labor saving: The processes of material transportation, metering, mixing, and injection are continuously automated to reduce power consumption.
(2) Can improve production efficiency: seek to shorten the molding cycle through rapid solidification.
(3) Can improve product quality: no reaction by-products generated, no impurities mixed.
(4) Suitable for composite molding: Due to the good fluidity of the material, low molding pressure, and wide curing temperature range, it is possible to perform composite molding in addition to molding the insert.

2. Latest technological developments in LIMS
Currently, it is not only transitioning from a pure mixing type with the above advantages to a LIMS method, but also actively developing in the following two directions recently.
(1) Fully automatic molding: no flash, no runner, automatic demolding
Regarding the fully automated molding process, people have conducted research from various aspects such as injection molding machines, molds, materials, and so on. It not only saves manpower in process operations, but also reduces material costs because it does not produce useless solidified products. From the perspective of environmental protection, this method has also received considerable attention. For the molding of micro products such as automotive frame oil seals, the molding cycle (from injection to the next injection) is required to be within 10 seconds, which can be completed in a very short time.
(2) Composite molding: clip insert molding, binary molding
Because the crosslinking reaction takes the form of addition curing, it can be formed at relatively low temperatures. Due to the absence of by-products such as peroxide decomposition residues in the crosslinking reaction, there is no need to undergo secondary vulcanization in principle. Therefore, it can be integrally molded with resin, and the binary molding that integrates the sealing part and the skeleton part by applying a primer material for inlay molding has also begun to become popular.

Silicone rubber has excellent properties (heat resistance, plug resistance, weather resistance, electrical insulation, flame retardancy, etc.). Due to these properties, it is possible to integrate environmentally friendly molding based on fully automatic molding with metal and organic resins. In addition, the material itself is transparent and has colorability, so its application range covers many fields, such as buttons (for computers, mobile phones, etc.), pacifiers for milk bottles, rubber rollers (for copiers, printers, etc.), pipe joint seals, oil seals, and other automotive accessories, video tube anode caps, diving supplies, and so on.

3. Materials for automatic molding without adhesive edges/flow channels
In recent years, in the injection molding of liquid silicone rubber, a method called non adhesive edge and non runner molding has become popular. This is a molding method that does not produce useless solidified products and does not require secondary processing, that is, a molding method that does not have a material injection port, a flow path (even if there is one, it does not solidify), and does not generate waste adhesive edges. In order to implement this molding method, the structure of the model and the smoothness of the parting surface, as well as the metering and discharge accuracy of the injection machine, must meet the requirements. Even in terms of materials, it must be difficult to generate waste adhesive edges.

Latest Application and Development of Liquid Silicone Rubber
In recent years, the liquid rubber injection molding method (LIMS), that is, the injection molding of liquid silicone rubber, has been widely popularized and promoted. Recently, this method has become a popular molding method in the industry due to its advantages of being able to perform short-term automatic molding and composite molding with plastics. The following will introduce the latest trends in liquid silicone rubber injection molding and the materials suitable for this molding method.

1. Liquid Injection Molding of Silicone Rubber
The liquid silicone rubber injection molding method, which started in the 1970s, has gradually become popular. Today, as a molding method for silicone rubber, it has been recognized. First, the commonly used LIMS method is described.
To explain LIMS (Liquid Silicone Rubber Injection Molding) in one sentence is to use a pump to transport the added solidified liquid silicone rubber into an injection molding machine and solidify it in a mold. From the differences in the process flow and curing reaction of the two methods, the advantages of LIMS are as follows:
(1) Labor saving: The processes of material transportation, metering, mixing, and injection are continuously automated to reduce power consumption.
(2) Can improve production efficiency: seek to shorten the molding cycle through rapid solidification.
(3) Can improve product quality: no reaction by-products generated, no impurities mixed.
(4) Suitable for composite molding: Due to the good fluidity of the material, low molding pressure, and wide curing temperature range, it is possible to perform composite molding in addition to molding the insert.

2. Latest technological developments in LIMS
Currently, it is not only transitioning from a pure mixing type with the above advantages to a LIMS method, but also actively developing in the following two directions recently.
(1) Fully automatic molding: no flash, no runner, automatic demolding
Regarding the fully automated molding process, people have conducted research from various aspects such as injection molding machines, molds, materials, and so on. It not only saves manpower in process operations, but also reduces material costs because it does not produce useless solidified products. From the perspective of environmental protection, this method has also received considerable attention. For the molding of micro products such as automotive frame oil seals, the molding cycle (from injection to the next injection) is required to be within 10 seconds, which can be completed in a very short time.
(2) Composite molding: clip insert molding, binary molding
Because the crosslinking reaction takes the form of addition curing, it can be formed at relatively low temperatures. Due to the absence of by-products such as peroxide decomposition residues in the crosslinking reaction, there is no need to undergo secondary vulcanization in principle. Therefore, it can be integrally molded with resin, and the binary molding that integrates the sealing part and the skeleton part by applying a primer material for inlay molding has also begun to become popular.

Silicone rubber has excellent properties (heat resistance, plug resistance, weather resistance, electrical insulation, flame retardancy, etc.). Due to these properties, it is possible to integrate environmentally friendly molding based on fully automatic molding with metal and organic resins. In addition, the material itself is transparent and has colorability, so its application range covers many fields, such as buttons (for computers, mobile phones, etc.), pacifiers for milk bottles, rubber rollers (for copiers, printers, etc.), pipe joint seals, oil seals, and other automotive accessories, video tube anode caps, diving supplies, and so on.

3. Materials for automatic molding without adhesive edges/flow channels
In recent years, in the injection molding of liquid silicone rubber, a method called non adhesive edge and non runner molding has become popular. This is a molding method that does not produce useless solidified products and does not require secondary processing, that is, a molding method that does not have a material injection port, a flow path (even if there is one, it does not solidify), and does not generate waste adhesive edges. In order to implement this molding method, the structure of the model and the smoothness of the parting surface, as well as the metering and discharge accuracy of the injection machine, must meet the requirements. Even in terms of materials, it must be difficult to generate waste adhesive edges. As shown in Figure 2 (omitted), after the rubber entering the mold cavity fills the mold cavity, due to excessive rubber or due to factors such as thermal expansion of silicone rubber, the rubber flows into the parting surface, and after solidification, it becomes a waste rubber edge. If the parting surface is designed to be narrower, it is difficult to generate waste adhesive edges, but at the same time, it is also difficult to exhaust air, which becomes the cause of bubbles in the finished product.

Compared to previously used materials, the curing curve of this material is in a sharp transition state (the time from the beginning of curing to the end of curing is very short). By selecting the appropriate injection conditions for this type of material, that is, before the material fills the mold cavity, curing has not yet begun, and the material has good fluidity. When the material fills the mold cavity, curing immediately ends. Even if there is residual pressure, the material will not flow to the parting surface, preventing the formation of waste adhesive edges.

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