Alkyl Modified Siloxane
is a silicone compound with high water resistance, good heat stability and excellent electrical insulation. It is mainly used as a fire retardant, lubricant and moisture-proof agent in the production of rubber, plastic and fiber reinforced materials, and also as an additive for coatings. This product can be dissolved in water to form emulsions, and the perfect dilution ratio has to be determined through trials. It can be mixed with ordinary high temperature die casting silicones to reduce carbon decomposition, improve demoulding effects and maintain the brightness of workpieces.
The term alkoxy is defined as any divalent organic group having 1 to 12 carbon atoms, and preferably 3 to 8 carbon atoms. The alkoxy groups can be straight or branched chains, and may contain one or more carbon-carbon double bonds (e.g. oleyl). The hydroxyl groups can be substituted with one or more alkyl group, and the alkoxy groups can be optionally ethoxylated.
When a non-alkyl modified silicone is exposed to air, it undergoes a phase separation into a solid wax at room temperature and a fluid at higher temperatures, depending on the molecular parameters such as the chain length of the alkyl group, the number of alkyl groups other than methyl, the polymer backbone molecular weight and the presence or absence of the Si-O bond. The formation of alkoxy groups at the ends of oligomers results in a strong hydrogen bond with the Si-O bond, which reduces the thermal decomposition rate. The hydroxyl groups further react with the siloxane bridges to form crosslinking structures in a silicone oligomer.
The alkyl group of the silicone is also able to enhance the compatibility of the silicone with hydrocarbon oils, which translates to a lower pour point and a greater consistency in liquid form. In addition, the long alkyl chains improve plastic on plastic lubrication and allow for easy processing during molding.
The polyether-modified siloxane of the present invention is superior in its solubility and affinity for many organic solvents compared to the conventional alkyl-modified silicon dioxides used in the prior art, and it is particularly useful in a wide range of applications.