Effect of titanium tailings on mechanical properties of polypropylene materials

doi:10.19491/j.issn.1001-9278.2024.03.005

Abstract

Abstract:

In this paper， a series of polypropylene （PP）⁃based composites were prepared through melt blending using titanium removal tailings as an inorganic filler and KH⁃570 （γ⁃methylacryloxy propyl trimethoxysilane） as a coupling agent. The properties of the composites were characterized by using universal testing machine， scanning electron microscope， and differential scanning calorimeter （DSC）， and the influencing factors were analyzed. The results indicated that the tensile strength of the composites was inversely proportional to the addition amount of titanium tailings. The tensile strength of the composites was effectively improved by washing titanium tailings. The modified slag has better dispersibility in the matrix， the composite samples prepared by using the modified slag exhibited higher tensile strength than the unmodified sample. Meanwhile， their lipophilicity was enhanced， but their hydrophilicity was deteriorated. After screening and grading， the titanium tailings exhibited a more uniform particle⁃size distribution， and the composites presented higher tensile strength than the unscreened system at titanium tailing loadings of 10 and 30 wt%.

Key words: titanium tailings removal, modification, washing, particle size, mechanical property

CLC Number:

TQ325.1⁺4

CHEN Chisheng, YANG Shuai, ZHANG Jianjun, GUO Qitai, CAI Yuan, MA Sude. Effect of titanium tailings on mechanical properties of polypropylene materials[J]. China Plastics, 2024, 38(3): 26-30.

Figures/Tables 13

成分	含量/%
FeO	1.63
SiO₂	27.75
Al₂O₃	15.14
CaO	26.86
MgO	8.01
MgCl₂	3.17
CaCl₂	0.98
FeCl₃	1.09
TiC	3.14
TiO₂	4.15
C	4.7
S	0.52
V	0.06
TTi	5.3
TFe	1.6
Cl^⁃	4

Tab.1. Typical chemical composition of titanium tailings

Fig.1. Spline standard for the tensile test

Fig.2. Influence of addition amount of titanium tailings on the tensile strength

Fig.3. Particle size distribution of titanium tailings before and after washing

Fig.4. Influence of washing process on the tensile strength of titanium tailings composite system

Fig.5. Schematic diagram of the action mechanism of silane coupling agent KH⁃570

Fig.6. Influence of modification technology on the tensile strength of titanium tailings composite

Fig.7. Particle size distribution of titanium tailings before and after screening

Fig.8. Influence of screening treatment on the tensile strength of titanium tailings composite

Fig.9. Surface contact angle test of the composite materials before and after modification

样品	接触角/°
聚丙烯/提钛尾渣复合材料	73.35
聚丙烯/KH⁃570提钛尾渣复合材料	90.46

Tab.2. Relationship between composite material sample and contact angle

Fig.10. Scanning electron microscopy of composite sections with different addition methods

Fig.11. TG curves of the composites with different addition methods

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