- 期刊
木材用尿素膠之示差掃描熱分析測定
Differential Scanning Colorimetry of Urea Formaldehyde Adhesive for Wood Utilization
摘要
本試驗就法國Pressamine 233尿素膠，及國產P_2尿素膠，進行示差掃瞄熱分析試驗，採用等溫方式或溫度掃瞄方式，由熱動力學數學式，分別求出其硬化縮合反應之活化能。此技術可直接應用在合板、粒片板、中密度纖維板、家具工廠等現場生產線上之膠合工程控制，以確保產品優良品質。試驗之主要結果如下：1. DSC技術研究木材用尿素膠硬化縮合反應機構是非常方便而有用的方法。2. 阿累尼斯方程式被用來處理等溫方式之DSC熱分析圈，求得Pressamine 233尿素膠添加1%氯化鐵之硬化縮合反應活化能為95.6 K. Joules/mole；而其添加20%麵粉及1%氯化銨之硬化縮合反應活化能為91.12 K. Joules/mole。3. 季辛吉技術應用在溫度掃瞄方式之DSC熱分析圖，求得Pressamine 233尿素膠添加0.5%、1%、1.5%、2%、2.5%、3%氯化銨等不同條件之硬化縮合反應活化能，分別為99.57、80.54、78.82、78.07、84.14、85.06 K. Joules/mole。4 向法，國產粒片板尿素膠量測溫度掃瞄方式之DSC熱分析圈，其添加1%氧化銨硬化縮合反應活化能為88.28 K. Joules/mole；而其添加20%麵粉及1%氯化銨之硬化縮合反應活化能為91.75 K. Joules/mole。
關鍵字
無資料並列摘要
The curing reactions of Urea-Formaldehyde (UF) resin catalyzed were examined using differential scanning calorimetry (DSC) analysis. The DSC thermogram for UF resin catalyzed by ammonium chloride showed an exothermic peak and anendothermic peak. These activation energies of the filled and unfilled flour of UF resin were calculated from the data of DSC thermograms according to the mathematics proposed by Kissinger or Arrhenius equation. The results were as follows: 1. The result of this study indicates that the differential scanning calorimetry technique can be a valuable and convenient method for fast evaluation of tracing the curing reaction property of a resin. 2. Arrhenius' equation enables evaluation of the activation energy (E) from the date of DSC thermograms. These E values of the filled and unfilled 20% flur of Pressamine 233 UF (FRANCE) resin catalyzed 1% NH4CI were 91.12 K. Joules/mole and 95.6 K. Joules/mole. 3. Kissinger's technique also can be a valuable tool for determination the activation energy of UF resin. These E values of filled 20% flour of Pressamine 233 UF resin with 0.5%, 1%, 1.5%, 2%, 2.5%, 3% ammonium chloide catalyst were 99.57, 80.54, 78.82,78.07,84.14 and 85.06 K. Joules/mole. 4. Those activation energies of the filled and unfilled 20% flour of P2 UF (TAIWAN) resin catalyzed 1% ammonium chloride were 91.75 K. Joules/mole and 88.28K. Joules/mole.