Flexible unsaturated polyester resin and preparation method and application thereof

柔性不饱和聚酯树脂及其制备方法和用途

Abstract

The invention relates to a flexible unsaturated polyester resin and a preparation method and application thereof. The resin is prepared by mixing and reacting a dibasic acid or anhydride, a monobasic acid and dibastic alcohol and diluting the reaction product with a diluent and comprises the following components in percentage by weight: 17 to 24 percent of dibastic alcohol, 3 to 5 percent of monobasic acid, 39 to 53 percent of dibasic acid or anhydride and 26 to 35 percent of diluent, wherein the monobasic acid is oleinic acid; and the diluent is styrene and diallyl phthalate which accounts for 2 to 5 percent of the total weight of the diluent. The preparation method comprises the following steps: performing polycondensation reaction on the dibastic alcohol and the dibasic acid or anhydride for 8 to 12 hours at the temperature of about 200 DEG C, wherein the acid value is 40 to 50mgKOH/g, reducing the temperature, adding the oleinic acid, performing polycondensation reaction for 2 to 3 hours, after the reaction is completed, reducing the pressure and performing vacuum treatment until the acid value is 25 to 35mgKOH/g, adding an additive, cooling, and adding the diluent to obtain the flexible unsaturated polyester resin. The prepared flexible unsaturated polyester resin has high elongation at break and impact toughness and certain strength, and meets the requirements on physical properties of articles.
本发明涉及一种柔性不饱和聚酯树脂及其制备方法和用途,树脂由二元酸或酸酐、一元酸与二元醇混合反应,再由稀释剂稀释而成,按重量百分比计包括:二元醇17-24%;一元酸3-5%;二元酸或酸酐39-53%;稀释剂26-35%,一元酸为油酸,稀释剂为苯乙烯和邻苯二甲酸二烯丙脂,邻苯二甲酸二烯丙脂占总重量的2-5%。制备方法是将二元醇与二元酸或酸酐在200℃左右缩聚反应8-12小时,酸值在40-50mgKOH/g,降温加入油酸缩聚反应2-3小时,反应完全,减压真空处理,至酸值在25-35mgKOH/g,加入添加剂,冷却,加入稀释剂,制得柔性不饱和聚酯树脂。制得的柔性不饱和聚酯树脂具有很高的断裂伸长率、冲击韧性,并具有一定的强度,满足制品的物理性能需求。

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Patent Citations (2)

    Publication numberPublication dateAssigneeTitle
    CN-101565496-AOctober 28, 2009上海新天和树脂有限公司;南通天和树脂有限公司封端型不饱和聚酯树脂及其制备方法
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    CN-102389185-AMarch 28, 2012广东溢达纺织有限公司Unsaturated polyester resin button and preparation method thereof
    CN-103396540-ANovember 20, 2013南通天和树脂有限公司一种柔性不饱和聚酯树脂
    CN-103755938-AApril 30, 2014南通天和树脂有限公司, 上海新天和树脂有限公司低温环境下高延伸率不饱和聚酯树脂
    CN-104892852-ASeptember 09, 2015黄亨利Formula and production process of PET