Page 44 - 理化检验-物理分册2025年第三期
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试验技术与方法 DOI:10.11973/lhjy-wl240329
PETG 悬臂梁冲击强度测定的主要影响因素
叶淋泉,曾 乐,兰孟琦
(华润化学材料科技股份有限公司,常州 213033)
摘 要:为进一步提高醇改性PET共聚酯(PETG)悬臂梁冲击强度测试的准确性,对其测试过程
中的影响因素进行分析,主要分析了标准、试验设备、试样尺寸、缺口成型工艺及其尺寸、刀片夹持
方式、人员、环境、成分种类和含量等影响因素。对各个影响因素进行测试和评估,并对10种不同的
PETG进行比较。结果表明:标准差异、缺口成型工艺及其尺寸、刀片夹持方式、成分种类和含量等对
PETG悬臂梁冲击强度的测定有较显著影响,如刀片夹持方式优化后可使PETG冲击强度测试结果的
相对标准偏差从15.90%降低至3.57%;5种1,4-环己烷二甲醇型PETG悬臂梁冲击强度基本为41~
62 J/m;而5种新戊二醇型PETG悬臂梁的冲击强度基本为85~112 J/m,两者有明显的区别。
关键词: PETG;悬臂梁冲击强度;缺口成型;夹持方式;相对标准偏差
中图分类号:TB324;TQ320.77 文献标志码:A 文章编号:1001-4012(2025)03-0032-05
The main factors affecting the determination of impact strength of PETG
cantilever beam
YE Linquan, ZENG Le, LAN Mengqi
(China Resources Chemical Innovative Materials Co., Ltd., Changzhou 213033, China)
Abstract: In order to further improve the accuracy of the impact strength test of alcohol modified PET
copolyester (PETG) cantilever beam, the influencing factors in the test process were analyzed. The influencing factors
such as standard, test equipment, spline size, notch forming process and its size, blade clamping method, personnel,
environment, component type and content were mainly analyzed. Various influencing factors were tested and
evaluated, and 10 different PETG were compared. The results show that the standard deviation, notch forming process
and its size, blade clamping method, component type and content had significant effects on the determination of impact
strength of PETG cantilever beam. For example, the relative standard deviation of PETG impact strength test results
could be reduced from 15.90% to 3.57% after the blade clamping method was optimized. The impact strength of 5 kinds
of 1,4-cyclohexanedimethanol PETG cantilever beams was basically 41-62 J/m. The impact strength of the five kinds of
PETG cantilever beams was basically 85-112 J/m, and there was a significant difference between the two.
Keywords: PETG; impact strength of cantilever beam; notch forming; clamping method; relative standard
deviation
第三单体(二元醇)改性PET共聚酯(PETG) 烷二甲醇酯(CHDM-PETG)、聚对苯二甲酸乙二醇
是一种非结晶性共聚酯,是聚合时分子链中一定量 酯-新戊二醇酯(NPG-PETG)。PETG可预防结晶
的乙二醇被 1,4-环己烷二甲醇(CHDM)、新戊二 化,进而有利于加工制造和改善透明度,可采用传统
醇(NPG)等取代后的新型共聚酯产品。最常见的
的挤出、注塑、吹塑及吸塑等加工成型方式,广泛应
PETG主要就是聚对苯二甲酸乙二醇酯-1,4-环己
用在化妆品包装、医疗器械和家用器皿等领域 [1-5] 。
PETG在这些应用场景下不可避免地存在磕碰、掉
收稿日期:2024-11-21 落等受力问题,而冲击强度测试能够有效评价塑料
基金项目:华材科技中心基础和创新研究项目(202319)
抵抗冲击的能力,判断塑料的脆性或韧性程度 ,因
[6]
作者简介:叶淋泉(1986—),男,硕士,工程师,主要从事材料分析
工作,yelinquan@foxmail.com 此冲击强度可以反映PETG材料抵抗高速冲击而致
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