纺织学报 ›› 2019, Vol. 40 ›› Issue (06): 8-13.doi: 10.13475/j.fzxb.20180703006

• 纤维材料 • 上一篇    下一篇

耐高温相变蜡/聚丙烯共混物的制备及其性能

魏海江1,2, 江力3, 张顺花1,2()   

  1. 1.浙江理工大学 材料与纺织学院、丝绸学院, 浙江 杭州 310018
    2.浙江理工大学 先进纺织材料与制备技术教育部重点实验室, 浙江 杭州 310018
    3.浙江恒澜科技有限公司, 浙江 杭州 311200
  • 收稿日期:2018-07-11 修回日期:2019-03-12 出版日期:2019-06-15 发布日期:2019-06-25
  • 通讯作者: 张顺花
  • 作者简介:魏海江(1994—),男,硕士生。主要研究方向为新纤维材料及功能性纤维材料。
  • 基金资助:
    浙江省国际科技合作双边产业联合研发项目(2019C54003)

Preperation and properties of heat-resistant phase change wax/polypropylene blends

WEI Haijiang1,2, JIANG Li3, ZHANG Shunhua1,2()   

  1. 1. Silk Institute, College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    3. Zhejiang Henglan Technology Co., Ltd., Hangzhou, Zhejiang 311200, China
  • Received:2018-07-11 Revised:2019-03-12 Online:2019-06-15 Published:2019-06-25
  • Contact: ZHANG Shunhua

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摘要：

为解决实际应用过程中石蜡起始挥发温度低的问题,采用双螺杆挤出机通过熔融共混法制备耐高温相变蜡(PC-WAX)/聚丙烯(PP)共混物,并借助差示扫描量热仪、热重分析仪与双柱毛细管流变仪对共混物的热性能与流变性能进行测试与分析。结果表明:PC-WAX质量分数为20%的共混物其起始挥发温度为225.91 ℃,相比纯PC-WAX增高,且热挥发速率减小;PC-WAX/PP共混物熔体属于剪切变稀流体,随着PC-WAX质量分数的增加,共混物熔体的剪切应力、剪切黏度与黏流活化能逐渐减小,在温度为180 ℃、剪切速率为5571.21 s-1下,PC-WAX质量分数为20%的共混物熔体剪切应力、剪切黏度与黏流活化能较纯PP分别下降了52.9%、48.6%和66.3%;共混物的结构黏度指数随温度的升高和PC-WAX质量分数的增加而减小。

关键词: 相变蜡, 聚丙烯, 挥发温度, 共混改性, 流变性能, 热性能

Abstract:

To solve low initial volatilization temperature of paraffin wax, phase change wax(PC-WAX)/ polypropylene(PP) blends were prepared by melt blending with twin-screw extruder. The thermal and rheological properties of blends were characterized by differential scanning calorimeter, thermal gravimetric analyzer and twin-bore capillary rheometer. The results demonstrate that the initial evaporation temperature of 20% mass fraction PC-WAX blends is 225.91 ℃. Compared with the initial evaporation temperature of PC-WAX, its value increases and thermal evaporation rate declines. The blends belong to the fluids of shear thinning type. As PC-WAX mass fraction increases, the shear stress, shear viscosity and viscous flow activation energy of blends will gradually decrease. At 180 ℃ and shearing rate of 5 571.21 s-1, the shear stress, shear viscosity and viscous flow activation energy of blends with 20% mass fraction PC-WAX has fallen by 52.9%, 48.6% and 66.3% respectively compared with the pure PP. Furthermore, the structure viscosity index of blends decreases with the increase of temperature and the mass fraction of PC-WAX.

Key words: phase change wax, polypropylene, volatilization temperature, blending modification, rheological property, thermal property

中图分类号: 

  • TS102.5

图1

不同质量分数PC-WAX共混物的升温与降温曲线"

表1

不同质量分数PC-WAX共混物的DSC数据"

样品
编号		 升温 降温
Tmo/
℃		 Tm/
℃		 ΔHm/
(J·g-1)		 Tco/
℃		 Tc/
℃		 ΔHc/
(J·g-1)
1# — — 0 — — 0
2# 26.83 29.67 7.05 24.50 22.00 6.95
3# 26.50 29.50 13.51 24.67 22.33 13.34
4# 26.33 29.50 19.98 25.00 22.50 19.82
5# 26.16 29.33 25.68 25.33 22.67 25.43

图2

不同质量分数PC-WAX共混物的热稳定性曲线"

图3

PC-WAX/PP共混物熔体的非牛顿指数"

图4

剪切速率对PC-WAX/PP共混物熔体流变性能的影响"

图5

温度对共混物熔体剪切黏度的影响"

表2

不同剪切速率下共混物熔体的黏流活化能"

试样
编号		 556.55 s-1 1 281.42 s-1 2 818.36 s-1 5 571.21 s-1
1# 42.22 35.61 32.93 27.44
3# 34.23 27.49 19.42 16.22
5# 28.35 20.68 15.12 9.25

图6

180 ℃下不同质量分数PC-WAX共混物的lgηα-γ·1/2曲线"

图7

4#试样在不同温度下的lgηα-γ·1/2曲线"

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