• TPE与TPU两种材料各自性能区别
  • 本站编辑:杭州红博新材料有限公司发布日期:2020-02-10 18:23 浏览次数:

TPE,是基于SEBS改性的。TPU,指的是热塑性聚氨酯。TPE与TPU都属于热可塑性的具有橡胶弹性的材料,硬度接近的TPE和TPU材料,特别是黑色,都具有一定柔软度和橡胶弹性,如仅靠肉眼观察,有时还是很难分清是TPE还是TPU的。但从细节入手,还是可以从多方面来分析TPE与TPU的区别和差异。

  1、硬度(范围)的差异 基于SEBS改性的TPE具有广泛可调整的硬度,其硬度范围可以在Shore A Scale 0~100范围变动,而TPU硬度范围则通常是在Shore 60A~Shore70D(目前国外出现硬度在45A左右的软性TPU,不过价格相当昂贵)。因此,可以说TPE的硬度区间是中低硬度,而TPU硬度则是中高硬度。

  2、燃烧区分 TPE燃烧,气味为特殊芳香味附带石油气味(石油味为PP组分燃烧气味),火焰先端黄,火焰根部蓝(超软硬度TPE,火焰根部为黄色)。TPU燃烧则带有一定的刺激性异味,燃烧时有兹兹的轻微爆炸声。

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  3、性能差异 TPU的弹性及弹性恢复性能(耐屈挠抗蠕变性能)优于TPE。主要是TPU的材料结构为聚合物均相结构,属于聚合物树脂类。而TPE则是多组分共混而成的多相结构聚集的合金材料。高硬度的TPE加工容易发生制品变形,而在所有硬度区间范围内,TPU均表现出优良的弹性,并且制品不易变形。

  4、触感上的差异 一些包覆成型的产品,如手柄、轮子,可能是TPE或TPU的。TPU材质的产品,手感较为粗糙,摩擦阻力强;而TPE材质产品,则手感比较细腻柔和,摩擦性能较弱。

  综上所述,TPE和TPU都属于软性材料,都具有良好的橡胶弹性。相比较而言,TPE在触感的舒适度方面更为,TPU则更多的呈现优异的弹性和强度。较低硬度的产品(如30A以下),需选用TPE,可以起到防滑缓冲减震回弹的效果。而对于较高硬度(80A以上)的要求弹性好的产品,用TPU才能胜任。TPE缩水率1.2~3%;TPU缩水率0.8~1.8%。

TPE is based on SEBS modification. TPU refers to thermoplastic polyurethane. TPE and TPU are rubber elastic materials with thermal plasticity. TPE and TPU materials with similar hardness, especially black, have certain softness and rubber elasticity. For example, it is difficult to distinguish TPE or TPU only by naked eyes. But starting from the details, we can analyze the differences between TPE and TPU from many aspects.

1. The difference of hardness (range) is based on the widely adjustable hardness of SEBS modified TPE. The hardness range of TPE can be changed from shore a scale 0 to 100, while the hardness range of TPU is usually from shore 60A to shore 70D (soft TPU with hardness of about 45A appears in foreign countries, but its price is quite expensive). Therefore, it can be said that the hardness range of TPE is medium to low hardness, while that of TPU is medium to high hardness.

2. TPE combustion is distinguished by combustion. The odor is special aromatic with petroleum odor (petroleum odor is the combustion odor of PP component), the flame tip is yellow, and the flame root is blue (super soft hardness TPE, and the flame root is yellow). TPU combustion has a certain irritating odor, and there is a slight explosion sound of zzz during combustion.

3. The elastic and elastic recovery properties of TPU are better than that of TPE. The main reason is that the material structure of TPU is polymer homogeneous structure, which belongs to polymer resin. TPE is a kind of alloy material with multi-component blending and multi-phase structure aggregation. High hardness TPE processing is prone to product deformation, and in all hardness ranges, TPU shows excellent elasticity, and the product is not easy to deformation.

4. Tactile differences some products, such as handles and wheels, may be TPE or TPU. TPU products have rough hand feel and strong friction resistance, while TPE products have delicate and soft hand feel and weak friction performance.

In conclusion, TPE and TPU are soft materials with good rubber elasticity. Compared with TPE, TPE is more excellent in tactile comfort, TPU is more excellent in elasticity and strength. For products with lower hardness (such as below 30a), TPE should be selected, which can play a role of antiskid, buffer, shock absorption and rebound. For products with high hardness (above 80A) and good elasticity, TPU is competent. The shrinkage of TPE is 1.2-3%, and that of TPU is 0.8-1.8%.


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