丙烯酸树脂的基本面, UL Prospector, 罗纳德·Lewarchik, 4/2016:
丙烯酸树脂主要是基于 丙烯酸酯 和 异丁烯酸甲酯 单体提供良好的耐候性, 耐水解, 表面应用的光泽和颜色保持. 由于它们的多功能性和性能, acrylic 涂料 account for over 25% of all 涂料 和 global 销售 approaching $25 billion. Acrylic resins can be thermoplastic or thermosett 和 are used in organic solvent born, 水传播的, 粉末和辐射固化涂料
Three broad classes of liquid 涂料 utilizing 丙烯酸树脂 include 热塑性，热固性和水性. Many 丙烯酸树脂 may also include other vinyl monomers such as 苯乙烯 or 醋酸乙烯酯 主要是为了降低成本. Acrylic monomers have a lower Tg than their analogous 异丁烯酸甲酯 monomers (for example compare the Tg for n-butyl 丙烯酸酯 versus n-butyl 异丁烯酸甲酯 see Table I 和 Table II). 如表二所示, the glass transition temperature of the monomers selected for synthesis of a resin can be selected to enhance multiple properties that may include weather resistance, 抗湿性, 氧气渗透, 灵活反应, 治疗和硬度. 除了, acrylics can be functionalized with a variety of monomers to provide improved adhesion to metal, or to react for example with aminoplast or isocyanate crosslinkers.
热塑性丙烯酸聚合物 (TPA) in general have excellent properties including exterior durability. Such resins were widely used in 汽车 OEM 和 Refinish topcoats from the 50’s to the 70’s, but their use has dramatically declined due to the high molecular weight necessary to provide properties, they require a high amount of organic solvent to enable air atomized spray application. 因此，这些涂料适用于重量约20%的固体. Thermoplastic resins typically use a high level of methyl 异丁烯酸甲酯 in their 聚合物 脊梁提供卓越的硬度和外观耐久性.
热固性丙烯酸树脂(TSA) are designed with functional monomers to either react with themselves when exposed to heat or moisture, 或与交联剂形成交联膜. Thermoset resins as a group are lower molecular weight 和 thus have higher application solids. 一次交联, as a class they offer films with excellent resistance to organic solvents, moisture 和 UV light 和 do not soften appreciably when exposed to moderately high temperatures as thermoplastics do. An example of 丙烯酸单体 with functional groups that can be used to functionalize acrylic 聚合物s to provide properties such as crosslinking, self-crosslinking, 附着力或颜料润湿性的改善见表三.
Being able to functionalize an 丙烯酸树脂 with a wide range of reactive moieties provides the ability to tailor the performance of the resin backbone to provide improved adhesion over a variety of substrates, improved pigment wetting 和/or the ability to provide crosslinking or self-crosslinking. 其他丙烯酸单体也可用于传递磺酸, 或者丙烯酸树脂的磷酸功能.
Being able to functionalize an 丙烯酸树脂 with a wide range of reactive moieties provides the ability to tailor the performance of the resin backbone to provide improved adhesion over a variety of substrates, improved pigment wetting 和/or the ability to provide crosslinking or self-crosslinking. 其他 丙烯酸单体 are also available to impart sulfonic acid, 或者丙烯酸树脂的磷酸功能.
氨基甲酸酯功能丙烯酸 can also be made for example by reacting an isocyanate functional acrylic with hydroxypropyl carbamate. Many of the acrylics in the category of functionalized 丙烯酸树脂 are used in 汽车 OEM 和 refinish clearcoats to provide an excellent combination of mar resistance, 耐化学性和光稳定性.
要阅读罗恩文章的其余部分，请点击 在这里 去UL探矿公司.