蓖麻油的酯交换甲酯化反应

研究了蓖麻油的酯交换甲酯化反应 ,采用气相色谱法定量检测脂肪酸甲酯的组成 ,确定了蓖麻油中键合甘油量为 9 89% ,甲酯混合物中蓖麻醇酸甲酯质量分数为 88%。工艺优化试验结果为 :反应在室温下进行 ,甲醇用量为理论量的 3倍 ,m (甲醇钠 )∶m (蓖麻油 ) =0 4～ 0 5∶10 0 ,反应时间为 3 0min～ 40min。该优化条件下 ,所得甲酯混合物收率 98%以上 ,蓖麻油全部转化 ,其中 96%转化为甲酯 ,其余为少量的单甘酯和微量的二甘酯。

OMR的合成及与其他表面活性剂混合溶液的表面性质

用酯交换甲酯化法合成出蓖麻油酸甲酯,将分离出的蓖麻醇酸甲酯与环氧乙烷反应,得到蓖麻醇酸甲酯乙氧基化物(OMR,EO平均数为10)。OMR及其与其他表面活性剂混合溶液的表面张力曲线表明,OMR分子在气液界面上的吸附和排布比较特殊,导致它的γCMC较大,为36.78 mN/m;但较大的分子结构也使它有比较低的CMC,为4.58×10-5mol/L。OMR与AEO9的混合溶液近似于理想溶液,其表面张力和CMC介于二者之间;OMR的加入能够使SDS的CMC降低近2个数量级,但混合溶液的协同作用不强;OMR与CTAB有很强的协同作用,混合溶液的表面张力曲线出现最低点,其γCMC值最小可达28.24 mN/m,远小于OMR的36.78 mN/m和CTAB的36.62 mN/m,混合溶液的CMC最低为2.80×10-5mol/L,亦低于OMR的CMC。

日化文献摘要

【题名】N-环己基-γ-氨丙基聚二甲基硅氧烷的合成、表征与应用性能【作者】李明涛,安秋风【刊名】精细化工【年/卷/期】2006/23/4【摘要】在碱性催化剂的作用下,用八甲基环四硅氧烷(D4)

Synthesis of Phenolic Resin Blended Castor Oil Based Modified Polyol for Two Component Polyurethane Coating

Castor oil is used to synthesize phenolic resin modified polyol. Castor oil, phenolic resin were taken in the molar ratio 0.07：0.027 and diethylene glycol （DEG） was also taken in varying hydroxyl numbers to achieve chemical modification in the backbone of synthesized polyol. Physico-chemical properties like acid value, OH value and moisture content of the modified polyol were measured. The prepared phenolic resin blended polyol were reacted with 4, 4-methylene diisocyanate and 2, 4-toluene diisocyanate to formulate the two component polyurethane （PU） coatings. Prepared coating is used to study properties such as gel time, surface dry, tack free and hard surface drying times. It was found that phenolic resin and diethyleneglycol used in synthesizing castor oil based modified polyols show the significant changes in physico-chemical properties of synthesized polyols. The variation in physico-chemical properties of synthesized polyol provide the information for desirable curing of polyurethane systems.