聚乙二醇改性热塑性环氧树脂及其可纺性

doi:10.13475/j.fzxb.20220806106

摘要/Abstract

摘要：

为拓宽热塑性环氧树脂在纺织材料领域的应用,以聚合-热压工艺制备了热塑性环氧树脂膜,进一步利用熔融分散工艺将聚乙二醇(PEG)分散至热塑性环氧树脂中制备环氧树脂/PEG粒料,并通过熔融-牵伸工艺制备环氧树脂/PEG长丝。探讨了环氧树脂/PEG的可纺性,分析了环氧树脂膜和环氧树脂/PEG长丝的力学与动态力学性能。结果表明:所制备的环氧树脂膜屈服应力为64.6 MPa,玻璃化转变温度可达100.2 ℃;PEG的加入使环氧树脂/PEG粒料的挤出力显著降低,当PEG质量分数为5%时,相比于纯环氧树脂挤出力降低了870 N;PEG对热塑性环氧树脂的纺丝温度具有调控作用,当PEG质量分数为7.5%时,相比于纯环氧树脂粒料,环氧树脂/PEG粒料的纺丝温度降低了30 ℃;经PEG改性后的环氧树脂长丝具有更小的直径和更优异的力学性能,相比于纯环氧树脂长丝,PEG质量分数为7.5%的环氧树脂/PEG长丝直径降低了50 μm,PEG质量分数为2.5%的环氧树脂/PEG长丝的断裂应变与断裂应力分别增加了60%和20 MPa。

关键词: 环氧树脂, 聚乙二醇, 热塑性, 可纺性, 熔融分散, 熔融-牵伸工艺, 环氧树脂长丝

Abstract:

Objective Thermoplastic epoxy resin has excellent mechanical properties and can be melted and reprocessed, but its melting processing temperature is relatively high which needs to be reduced. In order to develop thermoplastic epoxy resin as textile material and to reveal its potential application in the engineering field, on the basis of studying its mechanical and thermodynamic properties, the spinning temperature of thermoplastic epoxy resin needs to be regulated by melting dispersion polyethylene glycol (PEG).
Method Thermoplastic epoxy resin film was prepared by polymerizing-hot pressing process. The pellets of thermoplastic epoxy resin/PEG were further developed by the process of PEG melt-dispersion, and the epoxy resin/PEG filament was prepared by the process of melt-drawing. The mechanical and thermodynamic properties of thermoplastic epoxy resin film were analyzed. The influence of PEG on the spinnability of thermoplastic epoxy resin was discussed, and the mechanical and thermodynamic properties of PEG modified epoxy resin/PEG filament were analyzed.
Results The yield stress of the thermoplastic epoxy resin film is found to reach 64.6 MPa and the breaking strain 117.4%. The storage modulus of thermoplastic epoxy resin film at 25 ℃ is found as high as 2 296 MPa, and the glass transition temperatures 100.2 ℃. PEG significantly reduces the extrusion force of epoxy resin/PEG pellets. Compared with pure epoxy resin pellets, the extrusion force of epoxy resin/PEG pellets with 5% PEG content is reduced by 870 N at 300 ℃. The spinning temperature of pure thermoplastic epoxy resin pellets is as high as 300 ℃, and the extrusion force is about 1.92 kN at this spinning temperature. With the increase of PEG content, the extrusion force of epoxy resin/PEG pellets can reach about 1.9 kN during the spinning of pure epoxy resin pellets at lower temperature. Epoxy resin/PEG pellets with different PEG content can be spun into epoxy resin/PEG filament by melt-drawing process at the mixing temperature of 290 ℃ (PEG content: 2.5%), 280 ℃ (PEG content: 5%) and 270 ℃ (PEG content: 7.5%), respectively. Compared with pure epoxy resin pellets, the spinning temperature of epoxy resin/PEG pellets with 7.5% PEG content decreased by 30 ℃. PEG also improves the drawing effect of thermoplastic epoxy resin in spinning. In terms of diameter, the diameter of the epoxy resin/PEG filament with 7.5% PEG content is 50 μm lower than that of the pure epoxy resin filament. Compared with pure epoxy resin filament, the mechanical properties of thermoplastic epoxy resin/PEG filament are significantly improved; the breaking strain and breaking stress of the epoxy resin/PEG filament with 2.5% PEG content were increased by 60% and 20 MPa, respectively. PEG reduces the glass transition temperature of epoxy resin/PEG filament. Compared with pure epoxy resin filament, the glass transition temperature of epoxy resin/PEG filament with 7.5% PEG content is reduced by 20.9 ℃.
Conclusion Thermoplastic epoxy resin film developed in this research has high mechanical properties and thermal stability. The thermoplastic epoxy resin has the advantages of melting and reprocessing. At the same spinning temperature, the PEG-dispersed thermoplastic epoxy resin pellets have a lower extrusion force, so the spinning temperature can be controlled by the modification of PEG. The melt-dispersion process provides a new method for modification of thermoplastic epoxy resin by PEG. High spinnability of thermoplastic epoxy resin/PEG system was achieved by adjusting the spinning temperature of thermoplastic epoxy resin. The melt-dispersed PEG can significantly improve the spinnability of the thermoplastic epoxy resin, and the developed thermoplastic epoxy resin/PEG filament has higher mechanical properties.

Key words: epoxy resin, polyethylene glycol, thermoplastic, spinnability, melt-dispersion, melt-drawing technology, epoxy resin filament

中图分类号:

TQ342

胡宝继, 张巧玲, 王旭. 聚乙二醇改性热塑性环氧树脂及其可纺性[J]. 纺织学报, 2023, 44(02): 63-68.

HU Baoji, ZHANG Qiaoling, WANG Xu. Polyethylene glycol modified thermoplastic epoxy resin and its spinnability[J]. Journal of Textile Research, 2023, 44(02): 63-68.

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试样名称	纺丝温度/℃	挤出力/kN	平均直径/mm
PEG0	300	1.92	0.25
PEG2.5	290	1.90	0.23
PEG5	280	1.88	0.22
PEG7.5	270	1.85	0.20

试样名称	弹性模量/MPa	屈服应变/%	屈服应力/MPa	断裂应变/%	断裂应力/MPa
PEG0长丝	2 258	4.6	68	200	76
PEG2.5长丝	1 495	5.6	65	260	96
PEG5长丝	1 524	6.0	73	212	89
PEG7.5长丝	2 116	5.7	69	230	78

试样名称	T_g/℃	不同温度下的储存模量/MPa
试样名称	T_g/℃	25 ℃	T_g
PEG0长丝	102.7	2 690	45
PEG2.5长丝	95.7	2 732	40
PEG5长丝	87.1	2 801	43
PEG7.5长丝	81.8	2 755	43

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