体积脉动注塑rPE⁃HD/rPET混杂体系结构性能演变

doi:10.19491/j.issn.1001-9278.2024.08.001

中国塑料 ›› 2024, Vol. 38 ›› Issue (8): 1-7.DOI: 10.19491/j.issn.1001-9278.2024.08.001

• 材料与性能 •

体积脉动注塑rPE⁃HD/rPET混杂体系结构性能演变

梁济峰, 瞿金平()

华南理工大学机械与汽车工程学院，聚合物新型成型装备国家工程研究中心，聚合物成型加工工程教育部重点实验室，广东省高分子先进制造技术及装备重点实验室，广州 510640

收稿日期:2024-05-20 出版日期:2024-08-26 发布日期:2024-08-19
通讯作者: 瞿金平（1957—），男，院士，从事聚合物成型理论与装备等研究，jpqu@scut.edu.cn
E-mail:jpqu@scut.edu.cn

Structure and property evolutions of rPE⁃HD/rPET blending system via volume⁃pulsatile injection molding

LIANG Jifeng, QU Jinping()

National Engineering Research Center of Novel Equipment for Polymer Processing，Key Laboratory of Polymer Processing Engineering of Ministry of Education，Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing，School of Mechanical and Automotive Engineering，South China University of Technology，Guangzhou 510640，China

Received:2024-05-20 Online:2024-08-26 Published:2024-08-19
Contact: QU Jinping E-mail:jpqu@scut.edu.cn

摘要/Abstract

摘要：

以常见的废弃塑料制品组分高密度聚乙烯（PE⁃HD）、聚对苯二甲酸乙二醇酯（PET）为实验材料，设置两者的混杂比例为9/1、8/2和7/3，利用螺杆挤出机多次重复熔融再生，并利用体积脉动注塑成型工艺制备增强增韧的混杂塑料回收制品，实现多次回收制品力学性能的显著提高。分析了不同注塑工艺对样品微观结构的影响机理，证明了体积脉动注塑成型引入的脉动应力场能有效提高不相容组分间的相容性，诱导掺杂相原位成纤和材料结晶形态的改变，构建互联杂化串晶结构。力学测试结果表明，在PE⁃HD和PET的混杂比例为9/1时，体积脉动注射成型制备的混杂回收材料屈服强度和冲击韧性达38.7 MPa和165 kJ/m²，与稳态注射相比有54.8 %和3 675.7 %的提升。混杂比例为7/3时，样品的屈服强度和冲击韧性为31.0 MPa和11.6 kJ/m²，与稳态注射相比仍有14.8 %和216.1 %的提升。

关键词: 体积脉动注塑成型, 物理回收, 高密度聚乙烯, 增强增韧, 脉动应力场

Abstract:

In this study， high⁃density polyethylene （PE⁃HD） and polyethylene terephthalate （PET） as two common components of plastic wastes were employed as experimental materials. The mass ratios of PE⁃HD to PET were set to be 9/1， 8/2 and 7/3. A screw extruder was used to repeat the melt regeneration， and the volume⁃pulsatile injection molding method was used to prepare the reinforced/toughened hybrid recycled materials. The mechanical properties of the multi⁃recycled materials were significantly improved. The influence of injection molding method on the microstructure of the injection⁃molded samples was analyzed. The results indicated that the pulsatile stress field introduced by volume⁃pulsatile injection molding could improve the compatibility of the incompatible two phases effectively and induce the formation of in⁃situ submicron⁃fibril of the minor phase and the change of crystal morphology. This contributes to the formation of interlinked hybrid shish⁃kebab structure. Mechanical test results indicated that when the PE⁃HD/PET mass ratio was set to be 9/1， the hybrid recycled material prepared by volume⁃pulsatile injection molding exhibited yield strength and impact toughness of 38.7 MPa and 165 kJ/m²， which were 54.8 % and 3 675.7 % higher than those of conventional injection molded material. When the PE⁃HD/PET mass ratio was 7/3， the yield strength and impact toughness of the hybrid recycled material were 31.0 MPa and 11.6 kJ/m²， respectively， increased by 14.8 % and 216.1 % compared to those of conventional injection⁃molded material.

Key words: volume?pulsatile injection molding, physical recycling, high?density polyethylene, reinforcement and toughening, pulsatile stress field

中图分类号:

TQ320.6

梁济峰, 瞿金平. 体积脉动注塑rPE⁃HD/rPET混杂体系结构性能演变[J]. 中国塑料, 2024, 38(8): 1-7.

LIANG Jifeng, QU Jinping. Structure and property evolutions of rPE⁃HD/rPET blending system via volume⁃pulsatile injection molding[J]. China Plastics, 2024, 38(8): 1-7.

图/表 10

材料	不同加热段的温度设定/℃									螺杆转速/r·min^-1
材料	1	2	3	4	5	6	7	8	9	螺杆转速/r·min^-1
PE⁃HD	140	160	190	200	210	220	220	220	200	200
PET	240	250	260	260	265	265	265	255	245	150
PE⁃HD/PET	230	250	260	260	265	265	265	255	245	150

表1 挤出工艺参数

Tab.1 Parameters of the extrusion process

图1 样品的力学性能

Fig.1 Mechanical properties of the samples

图2 rPE⁃HD/rPET混杂回收样品的微观形态

Fig.2 Micromorphology of the rPE⁃HD/rPET mixed recycled samples

图3 rPE⁃HD/rPET混杂回收样品的结晶形态

Fig.3 Crystal morphologies of the rPE⁃HD/rPET mixed recycled samples

图4 rPE⁃HD/rPET混杂回收样品的冲击裂纹

Fig.4 Impact⁃fractured cracks of the rPE⁃HD/rPET mixed recycled samples

图5 rPE⁃HD/rPET混杂回收样品的冲击断面形态

Fig.5 Impact⁃fractured morphologies of the rPE⁃HD/rPET mixed recycled samples

图6 rPE⁃HD/rPET混杂回收样品的DSC曲线

Fig.6 DSC curves of the rPE⁃HD/rPET mixed recycled samples

样品	熔点/℃	结晶度/%
V91	126.7	60.52
V82	124.9	59.22
V73	123.6	60.02
C91	124.3	59.76
C82	123.0	58.19
C73	123.2	56.12

表2 样品熔点和结晶度

Tab.2 Melting points and crystallinities of the samples

图7 rPE⁃HD/rPET混杂回收样品的2D⁃WAXD测试结果

Fig.7 2D⁃WAXD results of the rPE⁃HD/rPET mixed recycled samples

图8 rPE⁃HD/rPET混杂回收样品的2D⁃SAXS测试结果

Fig.8 2D⁃SAXS results of the rPE⁃HD/rPET mixed recycled samples

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体积脉动注塑rPE⁃HD/rPET混杂体系结构性能演变

Structure and property evolutions of rPE⁃HD/rPET blending system via volume⁃pulsatile injection molding

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