小蕊 asked in 科學化學 · 1 decade ago

如何區分塑膠原料HPET、LPET?

塑膠原料分很多種,請問PE及PET如何區分?

PET又分為HPET、LPET要如何區分

Update:

我修正是HDPE及LDPE,那一種原料比較貴?

Update 2:

那一種的透光性會比較好?

2 Answers

Rating
  • ike
    Lv 5
    1 decade ago
    Favorite Answer

    我試著找出HPET、LPET這兩個差別,各位可以參考一下。

    第一篇一開始就給予PET分級了,就是分出HPET、LPET。

    1.Poly(ethylene terephthalate), or PET, is a thermoplastic polyester resin.

    Such resins may be classified as low-viscosity or high-viscosity resins.

    Low-viscosity PET typically has an intrinsic viscosity of less than 0.75,

    while high-viscosity PET typically has an intrinsic viscosity of 0.9 or higher.

    Low-viscosity resins, which are sometimes referred to as "staple" PET (when used in textileapplications), are used in a wide variety of products, such as apparel fiber, bottles, and photographic film.

    High-viscosity resins, sometimes referred to as "industrial" or "heavy denier" PET, are used in tire cord, seat belts, and the like.

    資料源自下列網址:

    http://www.epa.gov/ttn/chief/ap42/ch06/final/c06s0...

    2.另外尚有這一篇論文也可以當參考範例,看起來也是照者intrinsic viscosity(極限黏度)定義走。

    Two grades of PET were used in this study. One is a bottle-grade (Eastman 9921W), with an intrinsic viscosity, I.V., equal to 0.81 dl /g, a weight-average molecular weight, [M.sub.w], equal to 56,250 Da and a number-average molecular weight, [M.sub.n], equal to 26,000 Da. It will be referred to as "HPET" in the following. The other is an amorphous fiber grade, with an I.V. equal to 0.651 dl/g, and [M.sub.w] and [M.sub.n] respectively equal to 42,300 Da and 18,100 Da. It will be referred to as "LPET" in the following.

    資料源自下列網址:

    http://findarticles.com/p/articles/mi_hb3367/is_2_...

    3.危機百科對於PET的分級也是以intrinsic viscosity(極限黏度)當作分級的主軸。

    它又分的更細,四級如下:

    Fiber grade

    0.40 – 0.70 dℓ/g Textile

    0.72 – 0.98 dℓ/g Technical, tire cord

    Film grade

    0.60 – 0.70 dℓ/g PET film (biaxially oriented)

    0.70 – 1.00 dℓ/g Sheet grade for thermoforming

    Bottle grade

    0.70 – 0.78 dℓ/g Water bottles (flat)

    0.78 – 0.85 dℓ/g Carbonated soft drink grade

    Monofilament1.00 – 2.00 dℓ/g

    http://en.wikipedia.org/wiki/Polyethylene_terephth...

  • 下雪
    Lv 7
    1 decade ago

    有LPET??還是真的有

    我知道有HDPE和LDPE,差異就在聚合的側鏈數目不相同,造成透光性及性質差異。

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