增韧环氧树脂、多元醇分子量及有机硅改性聚氨酯的制备及对复合涂层防护性能的研究  

Preparation of toughened epoxy resin,polyol molecular weight and silicone modified polyurethane and study on protective properties of composite coating

作　　者：杨志 张翼[2] 杨慧敏[2] YANG Zhi;ZHANG Yi;YANG Hui-min(Shanxi Academy of Building Sciences Group Co.,Ltd.,Taiyuan 030001,China;Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]山西省建筑科学研究院集团有限公司,山西太原030001 [2]太原理工大学,山西太原030024

出　　处：《现代化工》2025年第4期180-189,共10页Modern Chemical Industry

基　　金：2021山西省重点研发计划(202102110401019)。

摘　　要：传统涂层因材料单一、综合防护性能较差,将聚醚胺D230、D400、D2000以不同比例固化E51来改善其韧性,作为环氧树脂底层。通过PTMG650与PTMG2000混合来调控聚氨酯微相分离结构,再将有机硅引入改进聚氨酯的力学、防水等性能,将其作为中间层。二者与聚脲外层制备出一种具有优良耐磨、防腐、抗冲击的复合涂层。结果表明,m(D230)∶m(D2000)=2∶1固化的E51涂层的附着力为1级,伸长率有较明显提升,抗冲击强度达100 cm。m(PTMG2000)∶m(PTMG6500)=1∶2制备的聚氨酯综合性能最佳,将羟基硅氧烷(PDMS)引入聚氨酯中发现,PU/Si-10%拉伸强度为34.07 MPa,伸长率从318.78%增加到343.74%,50%热分解温度较PU-650从363.26℃提升至417.97℃,静态水接触较PU-2000从80.23°升至100.02°,吸水率从2.28%降到1.132%。复合涂层附着力可达1级,远高于ISO 2409—2007要求的3级,冲击强度可达100 cm,远高于GB/T 1732—2020的要求。经过有机硅改性后,阻抗从6.647×10^(7)Ω·cm^(2)升至7.212×10^(7)Ω·cm^(2),30 min磨损量从8.17 mg降低到7.54 mg,防护性能优良。The traditional coating has poor comprehensive protection performance due to its single material.Polyether amine D230,D400 and D2000 in different proportions are used to cure E51 epoxy resin to improve its toughness,which is then used as the epoxy resin bottom layer.The micro-phase separation structure of polyurethane prepared is regulated through adjusting the mixing ratio of PTMG650 and PTMG2000,and then silicone is added to improve the mechanical and waterproof properties of polyurethane,which is used as the intermediate layer.The epoxy resin bottom layer,the modified polyurethane intermediate layer and a polyurea outer layer together are prepared into a composite coating with excellent wear-resistance,corrosion-resistance,impact-resistance and other properties.Results show that the E51 cured with a m(D230∶D2000)of 2∶1 has a grade 1 of adhesion,its elongation rate is significantly higher than that of E51 cured with other ratios,and its impact strength reaches 100 cm.Polyurethane prepared with a m(PTMG2000∶PTMG6500)of 1∶2 exhibits the optimal comprehensive performance.As para-hydroxysiloxane(PDMS)is added into polyurethane,it is found that the tensile strength of PU/Si-10%is 34.07 MPa,and the elongation rate increases from 318.78%to 343.74%.The 50%thermal decomposition temperature of PU/Si-10%is 417.97℃,compared to the 363.26℃of PU-650;The static water contact reaches 100.02°,compared to the 80.23°of PU-2000,and the water absorption rate decreases from 2.28%to 1.132%.The adhesion of the composite coating can reach grade 1,which is much higher than the level 3 standard required by ISO 2409—2007,and the impact strength can reach 100 cm,which is much higher than the requirements of GB/T 1732—2020.After being modified with silicone,the impedance increases from 6.647×10^(7)to 7.212×10^(7)Ω.cm^(2),and the wear loss in 30 min decreases from 8.17 to 7.54 mg.It is verified that the composite coating prepared has excellent protection performance.

关 键 词：复合防护涂层 增韧环氧树脂 有机硅 改性聚氨酯 

分 类 号：TQ633.9[化学工程—精细化工]