CAJ | 학술논문

以甲基丙烯酸甲酯、丙烯酸丁酯、甲基丙烯酸、甲基丙烯酸烯丙酯为单体,乙氧基化烷基醚硫酸铵(CO-436)和壬基酚聚氧乙烯醚(NP-40)为复合乳化剂,制备了含双键的丙烯酸酯共聚物乳液;以4,4'-二环己基甲烷二异氰酸酯、聚酯二元醇、二羟甲基丙酸、甲基丙烯酸羟乙酯为原料制备了双键封端的聚氨酯丙烯酸酯乳液.将两种乳液混合涂膜,经水分挥发干燥成膜后进一步进行紫外光固化.考察了甲基丙烯酸烯丙酯单体用量、引发剂用量、乳化剂配伍对丙烯酸酯乳液聚合的影响,以及光引发剂用量和两种乳液配比对固化膜凝胶含量、吸水率和涂层硬度、柔韧性、抗冲击强度的影响.结果表明:当甲基丙烯酸烯丙酯用量在3.0%～6.0%之间时,能制得表观稳定的丙烯酸酯共聚物乳液,并有50%左右的烯丙基双键参与了分子内的交联反应,同时残留50%左右的双键;共混乳液的固化膜凝胶含量达95%以上,铅笔硬度最大达到4H,柔韧性1 mm,抗冲击强度达到45 cm.
이갑기병희산갑지、병희산정지、갑기병희산、갑기병희산희병지위단체,을양기화완기미류산안(CO-436)화임기분취양을희미(NP-40)위복합유화제,제비료함쌍건적병희산지공취물유액;이4,4'-이배기기갑완이이청산지、취지이원순、이간갑기병산、갑기병희산간을지위원료제비료쌍건봉단적취안지병희산지유액.장량충유액혼합도막,경수분휘발간조성막후진일보진행자외광고화.고찰료갑기병희산희병지단체용량、인발제용량、유화제배오대병희산지유액취합적영향,이급광인발제용량화량충유액배비대고화막응효함량、흡수솔화도층경도、유인성、항충격강도적영향.결과표명:당갑기병희산희병지용량재3.0%～6.0%지간시,능제득표관은정적병희산지공취물유액,병유50%좌우적희병기쌍건삼여료분자내적교련반응,동시잔류50%좌우적쌍건;공혼유액적고화막응효함량체95%이상,연필경도최대체도4H,유인성1 mm,항충격강도체도45 cm.
A series of polyacrylic latex materials with reactive vinyl groups have been successfully synthesized by the emulsion polymerization of acrylic monomers (methyl methacrylate, butyl acrylate, methyl acrylate and allyl methacrylate) in the presence of ammonium nonylphenyl sulphate (CO-436) and polyoxyethylene nonyl phenol e-thers (NP-40) as composite emulsifiers. A waterborne polyurethane emulsion terminated with vinyl groups was pre-pared from dieyclohexylmethylmethane-4,4'-diisocyanate, polyester diol, dimethylol propionic acid and 2-hydroxy-ethyl methacrylate. A dried coating of a mixture of the acrylic latex and polyurethane dispersion was obtained by heating and UV-curing. The effects of varying the amount of allyl methacrylate, initiator and emulsifier during acry-late polymerization, and the weight ratios of polyacrylic latex to polyurethane dispersion and photoinitiator on the cross-linking degree, water absorption and physical and mechanical properties of the coating were studied. The re-sults showed that a stable polyacrylate emulsion with reactive vinyl groups could be obtained when the content of al-lyl methacrylate ranged from 3.0% to 6.0% and approximately 50% of the reactive vinyl groups of the allylic pre-cursor remained in the latex. The gel content of the UV-cured film reached 95%, and the pencil hardness was 4H, the flexibility was 1 mm and the impact strength was 45 cm.