防shuicailiao中deshuixingju氨zhi防shuituliao研究

 新闻zi讯   |    2019-09-29 08:56:46   |    

shuixingju氨zhi防shuituliao是yizhong高分ziju合物弹xing防shuicailiao,防shuixing高,化xuexing质稳定,you些防shuixing能甚至已经超过传tongde溶剂xingju氨zhituliao。如德国巴斯夫公司研制de高xing能shuixingshuangzu分ju氨zhi清漆和底漆bian具you优越de综合xing能,被yongzuo车身tuliao。耐shuixing是shuixingju氨zhituliaodezhu要xing能zhiyi,但xujian顾耐化xue品xing、热稳定xing、耐蚀xing等xing能。为了提高tuliaode综合xing能,tong常要对其jin行改xing并使其功能化。

shuixingju氨zhi防shuituliao

1.danzu分shuixingju氨zhituliao

danzu分shuixingju氨zhituliao是应yong最早deshuixingju氨zhituliao,具you强度高、断lieshen长率大、耐shuixing能好等特点,并能常温干燥,对基层变形de适应能li强。you于其高分zi量ju合物不能形成良好而稳定deshui分散体,因此传tongdanzu分shuixingju氨zhituliaotong常具you絰i蚫e分zi量或交联度。

an照使yongde原liao不同,可将danzu分ju氨zhituliao分为jumixing和juzhixing两zhong。you于jumi具you较强de亲shuixing,因此jumixingju氨zhituliao成膜houde耐shuixing存在不zu,但可tong过yong蓖麻油、三元jumi等参与反应lai加以改善。shuijiede不稳定xingze影响了juzhixingju氨zhituliaode应yong。

2.shuangzu分shuixingju氨zhituliao

shuangzu分shuixingju氨zhituliaoyou含─NCO基de多异氰酸zhigu化剂和含─OH基deshuixing多元醇zu成,它de制备与溶剂xingshuangzu分ju氨zhituliao相同,tong过异氰酸gen基团和羟基生成de自交联异氰酸zhi氨基甲酸yizhi在化xue交联反应过程中gu化成网状结gou膜并形成交联结gou,其tu膜xing能zhu要you羟基树脂dezu成和结goujue定。shuangzu分shuixingju氨zhituliao具you交联密度大,附着li强,di温柔韧,硬度高,以及耐化xue品xing、耐盐wuxing、耐候xing、耐shuixing俱佳等优点,基本可取代溶剂xingshuangzu分ju氨zhituliaode应yong,现已被广泛应yong于汽车制造、jian筑施工、油气管道pu设等领域。与shuangzu分溶剂xingju氨zhituliao相bi,shuangzu分shuixingju氨zhituliao中de多元醇既要提供yong于与gu化剂交联de活xing基团,又必须与gu化剂you较好de相容xing,shi现乳化簍ou稚⒐δ埽庾钪栈嵊跋於嘁烨杷醶higu化剂在shui中de分散稳定xing,成膜过程中de扩散与交联,以及tu膜dexing能。an照ju氨zhituliaode制备方法不同,tong常将shuixing多元醇体xi分为乳液xing多元醇簍ou稚⑻鍃ing多元醇两大lei。

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