用马来酸酐、环戊二烯、丙烯化合物和苯乙烯改性松香在有关文献中已有所记载。如所周知,用二烯亲和物改性松香时,由于枞酸型树脂酸共轭双键系的消失,与空气中的氧形成了氧化性能较低的产物。为了制取耐氧化的产品,本文作者研究了二氢萘(1,2—二氢萘)的改性松香。由于二氢萘没有聚合倾向,用于改性松香时可形成均一产物。含有苯环和环己烷环的二氢萘环状结构,能赋于改性松香高的耐氧性能。把脂松香装入反应器。这反应器装有机械搅拌装置、回流冷却器、滴液漏斗以及为通入二氧化碳而设置的扩散器。松香用油浴熔化加热到140℃,同时反应器通入二氧化碳。然后在搅拌条件下,由滴液漏斗加入等分子的二氢萘。升高温度到190°—200℃,在这条件下反应40小时。蒸出未反应的二氢萘以后,在真空下将产物干燥到恒量。已反 Maleic anhydride, cyclopentadiene, propylene compounds and styrene-modified rosin have been described in the literature. It is well-known that the modification of rosin with a dienophile affords a product of lower oxidation performance with the oxygen in the air due to the disappearance of the conjugated double bond of the abietic type resin acid. In order to make oxidation-resistant products, the authors studied the modified rosins of dihydronaphthalene (1,2-dihydronaphthalene). Since dihydronaphthalene does not tend to polymerize, homogeneous products can be formed when used to modify rosin. The dihydronaphthalene ring structure containing a benzene ring and a cyclohexane ring can impart high oxygen resistance to the modified rosin. Grease the rosin into the reactor. The reactor was equipped with a mechanical stirrer, a reflux condenser, a dropping funnel, and a diffuser for the introduction of carbon dioxide. Rosin was melted in an oil bath and heated to 140 ° C while the reactor was bubbled with carbon dioxide. An aliquot of dihydronaphthalene is then added from the dropping funnel under stirring. Raise the temperature to 190 ° -200 ° C and react under these conditions for 40 hours. After distilling off unreacted dihydronaphthalene, the product was dried under vacuum to a constant volume. Already