CAJ | 학술논문

利用时域核磁共振(TD NMR)技术对无固化剂的脲醛树脂在不同温度下固化过程进行了研究，实验结果表明：脲醛树脂在120℃左右时开始固化，在180℃左右时固化反应基本结束．随着温度的升高，自旋-自旋弛豫时间(T2)的总峰面积逐渐减少，当温度高于140℃时，总峰面积减少的程度较大．在30℃~140℃温度范围内，自旋-晶格弛豫时间T1(1)=0.014 ms时，随着温度的升高，峰面积先逐渐减少而后略微增加；T1(2)=327.455 ms时，随着温度的升高，峰面积逐渐减少．在30℃~180℃温度范围内，自旋-晶格弛豫时间(T1)分布的总峰面积随着温度的升高而逐渐减少．在固化过程中，随着温度的升高，脲醛树脂体系的质量逐渐减少，说明脲醛树脂胶黏剂体系发生了缩聚交联反应，同时生成了甲醛和水．
이용시역핵자공진(TD NMR)기술대무고화제적뇨철수지재불동온도하고화과정진행료연구，실험결과표명：뇨철수지재120℃좌우시개시고화，재180℃좌우시고화반응기본결속．수착온도적승고，자선-자선이예시간(T2)적총봉면적축점감소，당온도고우140℃시，총봉면적감소적정도교대．재30℃~140℃온도범위내，자선-정격이예시간T1(1)=0.014 ms시，수착온도적승고，봉면적선축점감소이후략미증가；T1(2)=327.455 ms시，수착온도적승고，봉면적축점감소．재30℃~180℃온도범위내，자선-정격이예시간(T1)분포적총봉면적수착온도적승고이축점감소．재고화과정중，수착온도적승고，뇨철수지체계적질량축점감소，설명뇨철수지효점제체계발생료축취교련반응，동시생성료갑철화수．
The curing process urea-formaldehyde resin without the use of hardeners was studied by time-domain nuclear magnetic resonance (TD NMR) at different temperatures. The results showed that urea-formaldehyde resin started curing at about 120℃and ended around 180℃. The total peak area for T2 decrease gradually with increasing temperature;and larger changes were observed when the temperature was above 140℃. At temperature range between 30 ℃ to 140 ℃, the peak areas decreased gradually and then increased slightly with increasing temperature at T1 (1)=0.014 ms;the peak areas decreased gradually with increasing temperature at T1 (2)= 327.455 ms. The total peak area for T1 decrease gradually with increasing temperature between 30℃and 180 ℃. The urea-formaldehyde resin system weight decreased gradually with increasing temperature in the solidification process, confirming that cross-linking condensation reaction may occur, giving off formaldehyde and water.