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Study on Modified Superfine Ground Calcium Carbonate in PVC

Author: DengZhengRong
Tutor: LiuChangWei
School: Beijing University of Chemical Technology
Course: Materials Science
Keywords: PVC Calcium carbonate Stearic acid Aluminum acetate Composite modified
CLC: TQ325.3
Type: Master's thesis
Year: 2009
Downloads: 138
Quote: 0
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Abstract


Studied the different modifying agents and modification process for superfine heavy CaCO 3 surface modification , superfine heavy CaCO 3 with PVC matrix interfacial bonding , Add the number of copies of different quality superfine heavy CaCO 3 of PVC composite mechanical properties , with a scanning electron microscope (SEM) observations of CaCO 3 / PVC composites microstructure and fracture surface . This paper uses stearic acid and aluminum acetate two kinds of modifiers , respectively, of different mesh heavy calcium carbonate were dry, wet and composite modified . Focuses on the complex modified 5000 mesh calcium carbonate filler content and mechanical properties, physical properties of the relationship . Through dry stearate modified heavy calcium carbonate, calcium carbonate content and materials investigated the relationship between the mechanical properties . With increasing the amount of calcium carbonate filler , the tensile strength and notched impact strength of a single peak ; 2500 mesh , 4000 mesh and 5000 , respectively, aim to improve the tensile strength of 14.7 %, 16.3 % and 24.5% ; single notched impact strength were increased by 172% , 240% and 271% . After heavy calcium aluminum acetate wet modification after 2500 mesh , 4000 mesh and 5000 , respectively, aim to improve the tensile strength of 14.9 %, 15.5% and 26.5% ; single notched impact strength were increased by 178% , 248% and 287% . 5000 mesh calcium carbonate modified by the composite , its mechanical properties of composites and aluminum hard ester -modified acid-modified greatly improved . Tensile strength than pure PVC increased by 38.4% , single- notched impact strength than pure PVC increased 364.5% . Copies filled PVC high calcium carbonate when ( 50 parts ) , the tensile strength than pure PVC increased by 11.8 %, single notched impact strength also increased by 198% . Composite modified calcium carbonate with high mesh modification is effective and can play a toughening of the composite role . 5000 mesh CaCO 3 / PVC composite volume resistivity with the increase of calcium carbonate , in favor of insulating material ; 5000 mesh CaCO 3 / PVC composite material has an average linear expansion coefficient increases with increasing the content of calcium is reduced , the dimensional stability of the polymer which is very favorable .

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > PVC and plastic
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