摘要:利用雙螺桿擠出機制備反射膜母粒，讓母粒與純PET直接共混、流延、拉伸制備聚對苯二甲酸乙二醇酯（PET）反射膜。通過反射率、密度及孔隙率、示差掃描量熱分析（DSC）等測試方法研究了不同拉伸溫度、不同拉伸倍率及無機粒子含量、無機粒子種類對PET反射膜的反射性能、密度及熔點和結晶溫度的影響。實驗研究表明：拉伸時最佳的溫度為105℃；最佳的拉伸倍率為6倍，拉伸倍率過高會使反射膜的反射率降低；無機粒子用量為32%（質量百分數，下同）時，PET反射膜的反射率最高，無機粒子含量低于32%時，得不到較高的反射率，高于32%時，由于粒子的凝聚使反射率下降；二氧化鈦（TiO2）做填充粒子的反射效果比硫酸鋇(BaSO4)做填充粒子的反射效果好。無機粒子的加入使得反射膜的熔點升高，結晶溫度升高。

關鍵詞：反射膜；拉伸工藝條件；聚對苯二甲酸乙二醇酯；硫酸鋇；二氧化鈦

Abstract：Using twin-screw extruder to produce reflective film masterbatches. The masterbatches were blended, cast, and tensioned with pure PET resin to produce polyethylene terephthalate (PET) reflective film. Using reflectivity text, density text, porosity text, Differential Scanning Calorimetry (DSC) to discuss the influence of different stretching temperature, different tensile rate and different inorganic particle content, different inorganic particle type to the PET reflective film in reflection, density, melting point and crystallizing temperature performance. Experimental investigation shows that: the best stretching temperature is 105℃; the best tensile rate is 6 times. High tensile rate will lead to the reducing of reflective film. When inorganic particle dosage is 32%(quality percentage, similarly hereinafter), the reflectivity of PET reflective film is the highest, when inorganic particle dosage is below 32%, the reflectivity of PET reflective film is not high, when inorganic particle dosage is more then 32%, as the particles of coherence make reflectivity decline. Using the titanium dioxide (TiO2) as the filling particles, the reflection effect is better then barite ore (BaSO4) as filling particles. The melting point and the crystallization temperature will increases, when put the inorganic particles into reflective film, 

Key words: reflective film, tensile technique conditions, polyethylene terephthalate, barite ore, titanium dioxide