The main function of rubber release agent is to prevent rubber products from adhering to the surface of the mold, and to ensure that rubber products can be smoothly released from the mold without tearing. When using rubber release agent, it should be sprayed or coated on the surface of the mold cavity to form an effective isolation layer. Release agents should have a certain degree of chemical inertness and thermal stability, and should not contain corrosive substances to avoid damaging the surface of the mold; The residual decomposition substances on the surface of the mold should not affect the glossiness of the product. Do you know? There are many methods to achieve demolding effect in the process of manufacturing rubber products. Let's take a look with the editor of Jianyi Chemical below!
1. Silicon series demolding method
Organosilicon demolding is prepared from organosiloxane as raw material, and its advantage lies in good heat resistance, which makes the surface tension of the mold moderate and easy to form a uniform isolation film. However, after demolding, a layer of oily surface will form on the surface of the product. Before proceeding to the next process, the surface of the product must be cleaned thoroughly. Commonly used products on the market include silicone rubber, emulsified silicone oil, etc.
2. Oil wax series demolding method
The main characteristics of using this method for demolding are low cost and good adhesion performance, such as paraffin, sulfonated vegetable oil, polyethylene glycol, etc. Although these can achieve demolding effect, they are not environmentally friendly and also have certain pollution to the mold.
3. Active series demolding method
It is to use the surface activity of soap water, glycerin, sodium oleate and other substances to demold the product. Although the isolation performance is good, it can also cause damage to the mold.
4. Fluorine series demolding method
Fluorine materials can significantly reduce the surface energy of solids, making them non adhesive and difficult to infiltrate, and difficult to dissolve with other substances, effectively solving the bonding problem between finished products and molds. When formulated as rubber release agents, the amount of fluorine-containing compounds is extremely small. Suitable for thermoplastic resins, thermosetting resins, and various rubber products, the surface of molded products is smooth, and the secondary processing performance remains excellent, especially suitable for demolding of fine electronic components and automotive parts.
