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Apr 20, 2023
Chemical method of organic silicon modified alkyd resin
Organic silicon modified alkyd mainly adopts chemical methods, and there are generally three processes: the first is to add silicon intermediates, alcohols, and acids together into a reactor for one-step reaction; The second method is to first react the silicon intermediate with an alcohol, and then add an acid to react; The third type is formed by the reaction of alcohol and acid to form alkyd intermediates containing tibial groups, and then reacting with silicon intermediates. Actually, the third process is more commonly used. There are several commonly used synthesis reactions.
(1) Starting from the intermediate of silicon oxide (or silicon oxide) containing Si OMe bonds and the intermediate of alkyd resin containing C OH bonds, obtained through dealcoholization reaction
(2) Starting from the intermediate of silicon (or silicon oxide) containing Si-OH bonds and the intermediate of alkyd resin containing C-OH bonds, obtained through dehydration reaction
(3) Cool reaction between alkyd resin (or polyol) containing light groups and silicon oxide (or silicon oxide) containing silicon groups
(4) Functional silica gel (or silica gel) condenses with excess polyols and then reacts with polybasic and fatty acids
(5) Alkyd modified silicone resin is obtained by one-step reaction of the intermediate of silicon oxide calcination with polyols, polybasic acids, and fatty acids.
The physical method is the earliest modification method used, which involves directly adding organic silicone resin to the alkyd resin reaction at the end point and cold mixing it with medium to low oil alkyd resins. Organic silicone resin may be connected with alkyd resin through covalent bond under high temperature, but it is also possible that most organic silicone resins are only miscible with alkyd resin. In order to improve the miscibility of organic silicone resin, organic silicone resin often contains some long-chain compounds. Through such simple mixing, the outdoor weather resistance of alkyd resin is greatly improved. Generally speaking, using high phenyl silicone resin with good compatibility and alkyd resin with medium to low oil content for cold mixing has better thermoplastic properties, faster air drying speed, and better solubility than using high methyl content. Nevertheless, the modification effect is still poor, so it has now been phased out.