Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (06): 8-13.doi: 10.13475/j.fzxb.20180703006

• Fiber Materials • Previous Articles     Next Articles

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 E-mail:zshhzj@163.com

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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

CLC Number: 

  • TS102.5

Fig.1

Heating (a) and cooling (b) curves of blends with different PC-WAX mass fractions"

Tab.1

DSC dates of blends with different PC-WAX mass fractions"

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

Fig.2

TG curve of blends with different mass fractions of PC-WAX"

Fig.3

Non-Newtonian index of PC-WAX /PP blends"

Fig.4

Effect of shear rate on rheological properties of PC-WAX/PP blends. (a) Shear stress; (b) Shear viscosity"

Fig.5

Effect of temperature on shear viscosity of blends"

Tab.2

Viscous flow activation energy of blends at different shear rates $\ \ \ \ \ \ \ $ kJ/mol"

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

Fig.6

lgηα-γ·1/2 curves of blends with different quality fraction of PC-WAX at 180 ℃"

Fig.7

lgηα-γ·1/2 curves of 4# sample at different temperatures"

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