高强度酚醛树脂覆膜砂的研究

Study on the high strength phenolic resin coated sand

以环氧大豆油(ESO)为原料合成了一种含羧基和不饱和乙烯基的大豆油基功能性活性单体(MA-AESO)。采用不同交联聚合工艺,由MA-AESO制备得到4种聚合物,对其进行了力学性能测试,动态机械热分析和热重分析。结果表明,与单交联体系相比,双重交联体系的共聚物均具有刚性材料的特征,其拉伸强度均显著提高,断裂伸长率有所下降,其中热引发双重交联聚合物具有最高的拉伸强度11.65 MPa和最高的邵氏硬度63 HD。双重交联共聚物具有相对较高的储能模量和玻璃化转变温度,而光引发聚乙烯基酯单交联聚合物具有最低的储能模量和最低的玻璃化转变温度。四种交联聚合物均具有良好的热稳定性,且两种双重交联聚合物材料的初始分解温度均在360℃以上。本研究可为高刚性和高交联密度油脂基材料的制备提供新的研究思路。

The effects of high-molecular-weight polyether polyols,dibutyl phthalate,and tricresol phosphate on the properties of phenolic resin-coated sand were studied by tests of mechanical properties and heat resistance and infrared spectrum. The results showed that the high molecular weight polyether polyols could not only improve the tensile strength and flexural strength of the coated sand,but also improve the heat resistance of the coated sand. The overall performance of phenolic coated sand with polyether polyol wa obviously better than that of systems with phthalate and phosphate ester additives.