CAJ | 학술논문

为了调控粉末涂料的玻璃化转变温度和热稳定性,利用超临界流体法制备了 P (MMA-EA)-聚(甲基丙烯酸甲酯-丙烯酸乙酯)/高岭土粉末涂料.实验研究了丙烯酸乙酯单体浓度等过程因素对共聚反应的影响,并利用 GPC、FT-IR、TG、DTG、DSC 等分析方法表征了粉末涂料的性能.实验表明,随着丙烯酸乙酯(EA)单体浓度的增加,共聚物的相对分子量降低而其分子量分布变宽；当反应温度为75℃、时间为10 h、单体 MMA/EA 比值在0．6/0．4与0．7/0．3之间时,共聚物的相对分子量为(4．87~5．07)×104,且分子量分布相对较窄；随着丙烯酸乙酯含量的增加,MMA/EA 共聚物的玻璃化温度不断降低,且适宜于纸张表面干法涂布的玻璃化转变温度在60~66℃之间.随着高岭土添加量的增加,粉末涂料最大热降解温度逐渐提高,使粉末涂料既具备了良好的成膜性能,又具备了良好的热稳定性能.
위료조공분말도료적파리화전변온도화열은정성,이용초림계류체법제비료 P (MMA-EA)-취(갑기병희산갑지-병희산을지)/고령토분말도료.실험연구료병희산을지단체농도등과정인소대공취반응적영향,병이용 GPC、FT-IR、TG、DTG、DSC 등분석방법표정료분말도료적성능.실험표명,수착병희산을지(EA)단체농도적증가,공취물적상대분자량강저이기분자량분포변관；당반응온도위75℃、시간위10 h、단체 MMA/EA 비치재0．6/0．4여0．7/0．3지간시,공취물적상대분자량위(4．87~5．07)×104,차분자량분포상대교착；수착병희산을지함량적증가,MMA/EA 공취물적파리화온도불단강저,차괄의우지장표면간법도포적파리화전변온도재60~66℃지간.수착고령토첨가량적증가,분말도료최대열강해온도축점제고,사분말도료기구비료량호적성막성능,우구비료량호적열은정성능.
Particles of powder coating mingled poly(methyl methacrylate-ethyl acrylate)resin and kaolin as pig-ment were obtained in the media of supercritical carbon dioxide(sc-CO2).The effects of the EA concentration and other process factors on the copolymerization were discussed,then the powder coating was characterized by GPC,FT-IR,TG,DTG and DSC methods.The experimental results showed that the relative molecular weight of copolymer decreased and its distribution became wide with the increase of the EA monomer concentration. when the reaction temperature 75 ℃,reaction time 10 h,and the mass ratio of MMA/EA between 0.6/0.4 and 0.7/0.3,the molecular weight of copolymer can be reached to (4.87-5.07)×10 4 and its distribution was relative-ly narrow,which was suiable for dry surface treatment of paper.The glass-transition temperature (Tg)of the copolymer MMA/EA became lower when the increase of EA monomer concentration,therefore,an ideal glass-transition temperature of the powery coatings could be achieved by adjusting the mass ratio of MMA to EA,and the suitable Tgof MMA/EA was between 60 and 66 ℃.With the increase of kaolin,the maximum thermal deg-radation temperature of powder coatings increased,it made the power coating possess good film-forming prop-erty,and improve the performance of thermal-stability requirments.