Method of preparing long carbon chain triazine ultraviolet absorber containing ether bond at low temperature

The invention provides a method of preparing a long carbon chain triazine ultraviolet absorber containing ether bond at a low temperature. The method comprises steps of reacting a compound of formulaI and a compound of formula II at 65-70 DEG C in the presence of inorganic base to obtain an intermediate compound of formula III; and reacting the intermediate and C8-14 alcohol at 25-35 DEG C in thepresence of boron trifluoride etherate to obtain a target compound IV. The method has the advantages of lowering reaction temperature remarkably, reducing dosage of catalyst, being easy to operate, being lower in production cost, and being suitable for industrial production. The formula I, formula II, formula III, formula IV are shown in the description. 本发明提供种低温法制备含有醚键的长碳链三嗪类紫外线吸收剂的方法，该方法以式I化合物和式II化合物在无机碱催化下，于65-70℃反应，得中间体式III化合物；中间体再与C醇在三氟化硼乙醚催化下，于25-35℃反应，得目标化合物IV；该方法能够大幅降低反应温度，减少催化剂用量，操作简单，生产成本可进步降低，便于工业化生产。