摘要
通过反应性阻燃剂DOPO(9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物)和二乙醇胺对邻甲基酚醛环氧树脂进行接枝改性,然后用冰乙酸中和后制备得到阻燃环氧树脂乳液。研究反应温度、反应时间和催化剂用量等因素对DOPO接枝环氧树脂反应的影响;考察二乙醇胺用量、中和度等因素对环氧树脂水性化结果的影响;通过燃烧法、LOI值和热重表征制备得到阻燃环氧树脂乳液固化物的阻燃性能。结果表明,在催化剂三苯基磷用量为环氧树脂2.0%(wt),150℃条件下反应4 h为DOPO接枝改性的最优条件。二乙醇胺改性环氧树脂水性化开环率为25.0%,中和度为95.0%时,可以得到稳定性能优良的阻燃水性环氧树脂乳液。当树脂磷元素质量含量为3.0%时,其固化物LOI值可以达到39.2,700℃残碳率达到30.0%(wt),具有优良的阻燃性能。
A waterborne flame-retardant epoxy emulsion was prepared by modifying o-cresol Formaldehydeepoxy resin with a reactive flame retardant agent DOPO （9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide）and diethanolamine. The effect of factors such as reaction temperature, reaction time and catalyst dosage on themodify xcaction were studied. The ring-opening rate and neutralization degree of the epoxy were optimized.The flame-retardant ability of the cured phosphorous-containing epoxy resin was test by UL-94, LOI and TGAmethods. The results show that DOPO can be grafted onto the epoxy resin when a catalyst （triphenylphosphine）weight percentage of 2.0% of epoxy resin is used and the reaction temperature is set as 150℃ for 4 h. Stableepoxy emulsion can be obtained when the ring-opening rate of diethanolamine is 25.0% and the neutralizationdegree is 95.0%. When phosphorus content of the epoxy resin is 3.0%（wt）, the LOI value of the resin can reachto 39.2 and pass the UL-94 test. The 700℃ char remaining result is 30.0%（wt）, which indicates that thephosphorus modified resin has excellent flame retardant property.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2014年第2期325-329,共5页
Journal of Chemical Engineering of Chinese Universities
关键词
阻燃
环氧树脂
水性
磷改性
flame retardant
epoxy resin
waterborne
phosphorous-containing
