| 摘要: | 高強力聚酯纖維常被使用在橡膠補強材料，但聚酯纖維在加熱過程中超過到Tg點時產生熱收縮，此時給予張力使纖維受外力影響而拉伸，分子鏈由折疊型態漸漸伸直，形成結晶區其分子鏈呈現順向，以平衡收縮過度。聚酯表面具疏水性，因此在界面處理上該如何使其與橡膠黏結為一重點。
本研究是以聚酯原紗為原料，製作出不同撚度搭配的合股索，經施加不同張力下及六段熱處理後，探討不同撚度搭配與施加張力的大小，對於撚縮率、熱縮率與拉伸強力之影響。並利用兩段式浸漬，以遠紅外線預熱處理及添加異氰酸鹽化合物1-8%，探討其對黏結強力之影響。
由實驗結果得知，撚縮率均隨著撚度提高而上升。熱縮率會隨著撚度提高而下降，當樣本在125℃、150℃與175℃的溫度製程下，依撚度大小對應施加1-1.5kg張力，熱縮率可維持在0%，至於超過200℃以上的溫度製程則必須施加超過1.5kg的張力來降低熱縮率。以本實驗在第一次合股為2，第二次合股為1，在0kg張力下行熱處理後，有最高拉伸強力64.26kgf，而在第一次合股為4，第二次合股為3，在0.5kg、1kg與1.5kg張力下行熱處理後，分別有最高拉伸強力67.53kgf、65.08kgf與65.61kgf。二段浸漬後，添加2%異氰酸化合物經遠紅外線照射處理及未處理之合股索產生較高上藥率，其RFL上藥率達17.57%及17.44%。在異氰酸化合物濃度2%時，其黏結強力23.48kgf，提升17.40%；未處理之異氰酸化合物濃度2%，黏結強力22.88kgf，提升14.40%。
The high-strength polyester fiber are often used in rubber reinforcement materials, but there has a phenomenon when polyester heating over the glass transition temperature Tg, the molecular chain would change from folded to stretched, the molecular chain become crystallization and forward. At the same, it slide by force then stretch. In this situation if we give tension to let the fiber not to stretch or compress to much. Polyester fiber surface has hydrophobic so how to treatment the interface become a key point.
In this study, we use different tension and temperature to get the best elongation and shrinkage of the ply yarns. Under those conditions to use different pre-dealing by adding 1-8% isocyanate compounds, and dipping in RFL. Then after hot pressed rubber become ply yarns has better bonding strength. By increase the ply yarns absorb the RFL, and using fiber surface analysis, heat shrink, elongation, tensile fracture strength analysis to prove in different temperature, tensile has different effect. Ply yarns and rubber’s layer stripping strength.
We used the polyester filament to produce a variety of filament fold yarnswith the different of twist number. By using the tensile, through the six-level heat treatment system. We analysis the properties on strength, twist shrinkage, heat shrinkage of polyester ply yarn. It is found the twist shrinkage increase by twist number, but the heat shrinkage decrease. According with the twist level, the rate of heat shrinkage keep in 0% to applied 1-1.5kg force at the 125℃, 150℃, 175℃. The best to applied more than 1.5kg force at the 200℃, 225℃, 250℃.In 0kg force, the best tensile strength is 64.26kgf in 2 of twist number in first twisting and 1 of twist number in second twisting. In 0.5kg, 1kg, 1.5kg force, the best tensile strength are 67.53kgf, 65.08kgf, 65.61kgf in 4 of twist number in first twisting and 3 of twist number in second twisting.Pre-dipping, add 2% isocyanate compounds by far-infrared radiation treated and untreated joint stock index results in a higher rate on the drug, and its rate of 17.57% on the drug RFL and 17.44%. Bonding strength in the isocyanate compound concentration of 2%, the bond strength 23.48kgf, improved 17.40%; untreated isocyanate compound concentration of 2%, bond strength 22.88kgf, improved 14.40%. |
