水性聚酯树脂涂层制备及耐水解性研究
Preparation and hydrolysis resistance of waterborne polyester resin coatings
为改善水性聚酯树脂涂层耐水解性能,扩大其在卷材涂料中的应用,以三羟甲基丙烷和新戊二醇为多元醇,己二酸、邻苯二甲酸酐等为多元酸,引入马来酸酐、衣康酸、脱水蓖麻油酸为接枝交联剂,首先通过溶液聚合法合成不饱和聚酯树脂预聚体,之后采用成盐法引入丙烯酸等单体进行共聚,制备得到水性聚酯树脂。将其与氨基树脂经高温固化处理得到水性聚酯树脂涂层。实验系统探究了三羟甲基丙烷、己二酸用量,接枝交联剂种类及用量,以及树脂与氨基树脂固化比例对涂层耐水解性影响。结果表明,当三羟甲基丙烷用量为16.7%、己二酸用量为18.09%、接枝交联剂脱水蓖麻油酸用量为7.46%、水性聚酯树脂与氨基树脂的固化比例为3∶1时,水性聚酯树脂涂层耐水解性最优,其中耐水性优异(25℃、336 h)。
In order to improve the hydrolysis resistance of waterborne polyester resin coatings and expand their application in coil coatings,trihydroxymethylpropane and neopentylene glycol are used as polyols,adipic acid,phthalic anhydride,etc.are polyacids,and maleic anhydride,itaconic acid,and dehydrated castor oil fatty acid are introduced as grafting crosslinkers.Initially,an unsaturated polyester resin prepolymer was synthesized via solution polymerization.Subsequently,acrylic acid and other monomers were incorporated through a salt-forming method for copolymerization,yielding a waterborne polyester resin.The resin was then thermally cured with an amino resin at elevated temperatures to produce a waterborne polyester coating.This study systematically investigated the effects of trimethylolpropane content,adipic acid dosage,type and amount of grafting crosslinkers,and the curing ratio between polyester resin and amino resin on the hydrolysis resistance of the coatings.The results showed that when the dosage of trihydroxymethylpropane was 16.7%,the dosage of adipic acid was 18.09%,the dosage of grafted crosslinker dehydrated ricinoleic acid was 7.46%,and the curing ratio of water-based polyester resin to amino resin was 3∶1,the hydrolysis resistance of waterborne polyester resin coating was the best,and the water resistance was excellent (25℃,336 h).
水性聚酯树脂 / 交联 / 脱水蓖麻油酸 / 耐水解性 / 氨基树脂
waterborne polyester resin / crosslinking / dehydrated castor oil acid / hydrolysis resistance / amino resin
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