GB/T 14190-2017 纖維級(jí)聚酯（PET）切片試驗(yàn)中乙醛測(cè)定，液化石油氣，二甲醚，甲縮醛，乙縮醛，乙醇，室內(nèi)空氣，焦?fàn)t煤氣，煉廠氣，天然氣，變壓器油，多氯聯(lián)苯，植物油，增塑劑

GB/T 14190-2017 纖維級(jí)聚酯（PET）切片試驗(yàn)中乙醛測(cè)定
GB/T 14190-2017 纖維級(jí)聚酯（PET）切片試驗(yàn)中乙醛測(cè)定 詳細(xì)信息：

名稱：毛細(xì)管柱

固定液：聚乙二醇

規(guī)格：30m*0.32mm*0.25um

型號(hào)：PEG-20M

應(yīng)用：GB/T 14190-2017 纖維級(jí)聚酯（PET）切片試驗(yàn)方法

乙醛含量是聚酯（PET）切片的重要指標(biāo)之一,常規(guī)固相縮聚過程通常需要較長(zhǎng)的時(shí)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(yīng)用技術(shù)開發(fā)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(duì)脫醛后聚酯產(chǎn)品的聚合度、乙醛含量、微觀形貌和熱性能等進(jìn)行了表征。結(jié)果表明,當(dāng)周期性更新時(shí)間為1h時(shí),超臨界C02輔助PET固相縮聚脫醛的較優(yōu)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(shí)間內(nèi)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(duì)PET基體的塑化和溶脹作用越強(qiáng),導(dǎo)致PET表面變得疏松多孔,小分子醛和縮聚副產(chǎn)物乙二醇等越容易脫除。熱力學(xué)性能測(cè)試表明,隨著縮聚脫醛時(shí)間增加,聚酯產(chǎn)品結(jié)晶度逐漸增大,其主要是由超臨界CO2的塑化作用誘導(dǎo)聚酯結(jié)晶導(dǎo)致的。綜上所述,利用超臨界CO2可以有效強(qiáng)化PET固相縮聚脫醛過程。

GB/T 14190-2017 纖維級(jí)聚酯（PET）切片試驗(yàn)中乙醛測(cè)定  測(cè)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: