Hydroxyethylmethacrylate or HEMA is the monomer that is used to make the polymer polyhydroxyethylmethacrylate. The polymer is hydrophobic; however, when the polymer is subjected to water it will swell due to the molecule's hydrophilic pendant group. Depending on the physical and chemical structure of the polymer, it is capable of absorbing from 10 to 600% water relative to the dry weight. Because of this property, it was one of the first materials to be successfully used in the manufacture of flexible contact lenses

CAS：868-77-9
中文别名：甲基丙烯酸2-羟乙酯;甲基丙烯酸-2-羟乙酯;乙二醇单甲基丙烯酸酯;2-羟基乙基甲基丙烯酸酯;
英文别名：2-Hydroxyethyl methacrylate;2-HYDROXYETHYL METHACRYLATE (2-HEMA);2-hydroxyethyl 2-methylprop-2-enoate;ETHYLENEGLYCOL METHACRYLATE (HEMA);ethylene glycol monomethacrylate;BisoMer SR;METHACRYLIC ACID 2-HYDROXYETHYL ESTER;GE 610;ETHYLENE GLYCOL METHACRYLATE;2-HYDROXYETHL METHACRYLATE;2-Propenoic acid, 2-methyl-, 2-hydroxyethyl ester;hydroxy ethyl methacrylate;2-HYDROXYETHYLMETHACRYLATE;ethylene glycol methacrylate;HYDROXYETHYL METHACRYLATE;GMA;methanol,methyl methacrylate;
分子式：C6H10O3
分子量：130.142
精确质量：130.063
Psa：46.53
Logp：0.098

MDL号：MFCD00002863

外观与性状：无色液体
密度：1.073g/mLat 25°C(lit.)
沸点：67°C3.5mm Hg(lit.)
熔点：-12 °C
闪点：207°F
折射率：n20/D 1.453(lit.)
水溶解性：soluble
稳定性：Unstable - may polymerize in the absence of stabilizer. May be stabilized with, or contain small amounts of, diethylene glycol monomethacrylate, di(ethylene glycol)dimethacrylate, methacrylic acid. Incompatible with strong oxidizing agents, free radical in
储存条件：2-8ºC
蒸汽密度：5 (vs air)
蒸汽压：0.364mmHg at 25°C

RTECS号：OZ4725000
安全说明：S26-S36/37-S28A-S28
WGK Germany：1
危险类别码：R36/38; R43
海关编码：2916140000
危险品标志：Xi

生产方法
1.由环氧乙烷与甲基丙烯酸反应而得。在甲基丙烯酸中加入硫氰酸铁、四甲基氯化铵等及少许对苯二酚,搅拌加热至90℃,在氮气保护下,通入环氧乙烷气体反应约2h。将反应产物冷至60℃,加少量对苯二酚后减压蒸馏,收集86-89℃(0.67kPa)馏分即得成品,收率80%以上。 1.主要用于树脂及涂料的改性。与其他丙烯酸类单体共聚,可制得侧链含有活性羟基的丙烯酸树脂,可进行酯化反应和交联反应,合成不溶性树脂和提高粘接性,可用作纤维处理剂等。与三聚氰胺-甲醛(或脲醛)树脂、环氧树脂等共同反应,用于制造双组分涂料。加入高级轿车油漆中,可长期保持镜面光泽。还可用作合成纺织物的胶粘剂和医用高分子单体等。
用途
1.主要用于树脂及涂料的改性。与其他丙烯酸类单体共聚,可制得侧链含有活性羟基的丙烯酸树脂,可进行酯化反应和交联反应,合成不溶性树脂和提高粘接性,可用作纤维处理剂等。与三聚氰胺-甲醛(或脲醛)树脂、环氧树脂等共同反应,用于制造双组分涂料。加入高级轿车油漆中,可长期保持镜面光泽。还可用作合成纺织物的胶粘剂和医用高分子单体等。