Improve the flame retardancy of alkyd resins

In order to improve the flame retardancy of alkyd resins, chlorination methods are used. In the past, chlorinated alkyd resins were produced by passing dry chlorine gas through a solution of alkyd resin in carbon tetrachloride at room temperature and bubbling. After the chlorination, the alkyd resin has improved water resistance, acid resistance, alkali resistance, scratch resistance and corrosion resistance, and the antifouling property and flame retardancy of the paint are also improved. However, due to the use of carbon tetrachloride, it will cause environmental problems. Therefore, in recent years, efforts are being made to develop chlorinated alkyd resins from chlorinated polyfunctional acids and chlorinated polyfunctional alcohols such as chloracic anhydride, tetrachlorophthalic anhydride, and chlorinated cycloacetal. . The properties of the coatings prepared from phthalic anhydride, chloracaldic anhydride, chlorcycloacetal, chloracloic anhydride/chlorocycloacetal were compared.

It can be seen that the coatings prepared from chloromycetin, chlorocycloacetal, chloracic anhydride/chlorocycloacetal all have excellent flame retardancy.

Although the chlorine content of the chloracic anhydride coating and the chlorhexidine acetal coating are the same, the latter has a higher oxidation index, indicating that the flame retardant effect is better. This shows that not only the chlorine content affects the flame retardancy, but also the flame-retarding monomer groups in the resin skeleton also function. It can also be clearly seen that the alkali resistance and hardness of the latter three coatings are stronger than those of phthalic anhydride.

In summary, coatings made from chlorine-containing dibasic acids are not only suitable for flame retardancy but also suitable for water, alkali and high hardness coatings.

The chlorinated alkyd resin can be used not only alone, but also can be blended with other materials to improve performance.