CAJ | 학술논문

以N-甲基二乙醇胺(MDEA)为扩链剂制备了水性聚氨酯(PU)乳液,并用其与苯乙烯(St)、丙烯酸丁酯(BA)和丙烯酸羟乙酯混合单体制备了PU/苯丙(PUA)复合乳液,用傅里叶变换红外光谱表征了复合乳液的结构,考察了PU及复合乳液性能的影响因素,并研究了复合乳液的表面施胶性能.结果表明,在-NCO/-OH(摩尔比)为1.7～1.9、MDEA质量分数为10%、中和度为100%的条件下,合成了平均粒径为75 nm左右的水性PU;当反应温度为80 ℃时,PUA复合乳液呈乳白色且无凝胶产生;当BA∶ St(质量比)为1.5～2.0∶ 1.0时,PUA复合乳液的抗水性较好;当BA质量分数由30%增加到40%时,PUA复合乳液的粒径增大,粒径分布变宽;在室温下用质量分数为0.2%的PUA复合乳液对原纸进行表面施胶时,纸张的施胶度达到33%;在105 ℃下,仅需很短的熟化时间下机纸张的施胶度可达95%.
이N-갑기이을순알(MDEA)위확련제제비료수성취안지(PU)유액,병용기여분을희(St)、병희산정지(BA)화병희산간을지혼합단체제비료PU/분병(PUA)복합유액,용부리협변환홍외광보표정료복합유액적결구,고찰료PU급복합유액성능적영향인소,병연구료복합유액적표면시효성능.결과표명,재-NCO/-OH(마이비)위1.7～1.9、MDEA질량분수위10%、중화도위100%적조건하,합성료평균립경위75 nm좌우적수성PU;당반응온도위80 ℃시,PUA복합유액정유백색차무응효산생;당BA∶ St(질량비)위1.5～2.0∶ 1.0시,PUA복합유액적항수성교호;당BA질량분수유30%증가도40%시,PUA복합유액적립경증대,립경분포변관;재실온하용질량분수위0.2%적PUA복합유액대원지진행표면시효시,지장적시효도체도33%;재105 ℃하,부수흔단적숙화시간하궤지장적시효도가체95%.
Hydrophilic polyurethane(PU) was synthesized with N-methyldiethanolamine(MDEA) as chain exdtender, and PU/styrene-acrylate (PUA) emulsion was prepared with styrene and butyl acrylate as monomers and PU as seed emulsifier. The structure of PUA emulsion was characterized by Fourier transform infrared spectroscopy. Effect factors on the properties of PU and PUA emulsions were investigated, and the performance of surface sizing of PUA was researched as well. The results showed that the average size of PU was 75 nm at -NCO/-OH(mole ratio) from 1.7 to 1.9, mass fraction of MDEA of 10% and neutral degree of 100%. PUA emulsion was milky white and no gel produced at reaction temperature of 80 ℃. The PUA emulsion had good water resistance at BA/St(mass distribution widened when mass fraction of BA increased from 30% to 40%. The sizing degree of base paper reached 33% at mass fraction of PUA of 0.2% and room temperature, and the sizing degree reached 95% after the paper was aged at 105 ℃ for a short time.