Why Do You Need To Dilute Silica Gel When Making Silicone Products?

2024-03-01

Under normal circumstances, when customers use liquid mold silicone to make molds, they will not deliberately dilute the silicone. They can solidify the silicone and become a silicone mold according to normal operating techniques. But there are also special cases. Some will add a certain amount of silicone oil and other substances to dilute the silica gel. What is the purpose of doing this? Is it necessary? By the way, you can use Jinyu Machinery silicone mixing machine, or other Silicone Machines.

One of the reasons for dilution: The main components of liquid silicone are silica, silicone oil, 107 base rubber and other raw materials; however, in order to reduce production costs, many manufacturers add large amounts of silica (the cost of silica is lower, add more powder and less powder). Refueling, the overall cost decreases, but the quality also decreases), resulting in a greatly reduced fluidity of liquid silicone and a high viscosity; this kind of liquid mold silicone with high viscosity and no fluidity is inconvenient for customers to operate, and it is difficult to remove air bubbles , the finished product qualification rate is very low.

Therefore, in this case, for liquid silicone with high viscosity and poor fluidity, silicone oil, that is, a diluent, will be added to achieve the dilution effect and improve the fluidity; after adding silicone oil, the hardness of the liquid silicone will decrease accordingly. , the performance of silicone will be reduced accordingly. It is generally recommended that customers add no more than 10% of silicone oil. For every 2% of silicone oil added, the hardness of liquid silicone after curing will be reduced by 1 degree, and the tear resistance and tensile strength will also decrease. will be reduced accordingly. It can be seen that it is necessary to choose regular liquid silicone and dilute it yourself. If it is not operated properly, the consequences will be very serious.

The second reason for dilution: Liquid silicone has a shelf life, and 3-6 months is the best use period; after more than half a year, liquid silicone will slowly thicken as the water inside evaporates, so it must be used before half a year. over. If it is not used up within the specified time, you can add a little silicone oil and stir, and the fluidity will be restored with little impact on performance (unlike adding a large amount of silica, such dilution has little impact on the overall silicone performance).

The purpose of diluting liquid silica gel is to restore its fluidity and reduce viscosity; but wouldn`t it be better to choose silica gel provided by regular manufacturers, or to use up the purchased liquid silica gel within the specified time without causing dilution? ? Jinyu Precision Machinery specializes in equipment of making silicone products, silicone products and other automated Silicone Equipment. We provide you with all services related to the silicone product production line, one-stop solutions for silicone dispensing, how to choose better silicone raw materials, and the supply of molds. We will make a complete plan based on your needs.

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With more than 20 years of independent research and development, we have a senior and specialized group. Our company have set up a good reputation within the industry and become the earliest production base of PVC products making machine , Silicone Products Making Machine and other related machines all over the world.

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