GB/T 14190-2017 纖維級聚酯（PET）切片試驗中乙醛測定，液化石油氣，二甲醚，甲縮醛，乙縮醛，乙醇，室內空氣，焦爐煤氣，煉廠氣，天然氣，變壓器油，多氯聯苯，植物油，增塑劑

GB/T 14190-2017 纖維級聚酯（PET）切片試驗中乙醛測定
GB/T 14190-2017 纖維級聚酯（PET）切片試驗中乙醛測定 詳細信息：

名稱：毛細管柱

固定液：聚乙二醇

規格：30m*0.32mm*0.25um

型號：PEG-20M

應用：GB/T 14190-2017 纖維級聚酯（PET）切片試驗方法

乙醛含量是聚酯（PET）切片的重要指標之一,常規固相縮聚過程通常需要較長的時間將其值降低1 ppm以下以滿足瓶用聚酯的要求。

浩瀚色譜（山東）應用技術開發有限公司通過粘度分析、頂空氣相色譜、掃描電鏡、示差量熱掃描等對脫醛后聚酯產品的聚合度、乙醛含量、微觀形貌和熱性能等進行了表征。結果表明,當周期性更新時間為1h時,超臨界C02輔助PET固相縮聚脫醛的較優工藝條件為脫醛溫度230 ℃C,C02壓力8 MPa,粒徑0.30 mm-0.45 mm。在該工藝條件下,可在較短時間內制備獲得聚合度接近150,乙醛含量低于1 ppm的聚酯聚合物。SEM分析表明,粒徑越小,超臨界CC02對PET基體的塑化和溶脹作用越強,導致PET表面變得疏松多孔,小分子醛和縮聚副產物乙二醇等越容易脫除。熱力學性能測試表明,隨著縮聚脫醛時間增加,聚酯產品結晶度逐漸增大,其主要是由超臨界CO2的塑化作用誘導聚酯結晶導致的。綜上所述,利用超臨界CO2可以有效強化PET固相縮聚脫醛過程。

GB/T 14190-2017 纖維級聚酯（PET）切片試驗中乙醛測定  測試譜圖：




GB/T 14190-2017 Determination of acetaldehyde in fiber grade polyester (PET) chip test
GB/T 14190-2017 Determination of acetaldehyde in fiber grade polyester (PET) chip test Details:

Name: capillary column

Fixative: polyethylene glycol

Specifications: 30m*0.32mm*0.25um

Model: PEG-20M

Application: GB/T 14190-2017 Fiber Grade Polyester (PET) Chip Test Method


Acetaldehyde content is one of the important indicators of polyester (PET) chips, and the conventional solid-phase polycondensation process usually takes a long time to reduce its value to below 1 ppm to meet the requirements of PET for bottles.

Haohan Chromatography (Shandong) Application Technology Development Co., Ltd. conducted viscosity analysis, headspace gas chromatography, scanning electron microscopy, differential calorimetry scanning, etc. on the polymerization degree, acetaldehyde content, microscopic morphology and thermal properties of polyester products after dealdehyde characterization. The results show that when the periodic renewal time is 1h, the optimal process conditions for supercritical CO2-assisted solid-phase polycondensation of PET for dealdehydeization are as follows: dealdehydeization temperature of 230 ℃, CO2 pressure of 8 MPa, and particle size of 0.30 mm-0.45 mm. Under this process condition, polyester polymers with a degree of polymerization close to 150 and an acetaldehyde content of less than 1 ppm can be prepared in a relatively short time. SEM analysis showed that the smaller the particle size, the stronger the plasticizing and swelling effect of supercritical CC02 on the PET matrix, resulting in a loose and porous PET surface, and the easier removal of small molecular aldehydes and polycondensation by-products such as ethylene glycol. Thermodynamic performance test showed that with the increase of polycondensation dealdehydeization time, the crystallinity of polyester products increased gradually, which was mainly caused by the plasticization of supercritical CO2 induced polyester crystallization. In summary, the use of supercritical CO2 can effectively strengthen the PET solid-phase polycondensation dealdehydeization process.

GB/T 14190-2017 Determination of acetaldehyde in fiber grade polyester (PET) chip test Test spectrum: