The Research On Both Surface Modification Of Needle Shape Wollastonite Particle And Effect On Performance Of Modified Needle Shape Wollastonite Particle Filled ABS Resin

Wollastonite is a kind of new industrial mineral. Comparing with other mineral, wollastonite shows a lot of advantages such as innocuous, resistance to chemical attack, low oil absorbency, low price, needle-like shape. It is widely used for succedaneum of glass fiber, asbestos and talc powder as filler in rubber, plastic material and paper industrial. The consistency between inorganic filler and polymer material is not good and the dispersion of inorganic filler in polymer material is very bad. So we need to modify the surface of wollastonite powder to increase the consistency and the dispersion of wollastonite powder in inorganic material.To gain the fine modification effect, the existing means of surface modification need to heat, to mechanical stir and to intermix the powder and the modifier. The means of heating is transferring the heat by heat-conducting oil or by the air current of interlayer with the conditional heat producer such as resistance wire, coal, fuel oil and fuel gas. This heat transfer process for powder and modifier is a surface to inner process while the heating speed couldn't be too quick to overly increase the temperature gradient. So the heating efficiency is very low. Beside, the traditional means of heating can't heat the appointed ingredients of mixed powder and there are few optional devices for surface modification while all of them are of low efficiency.The wollastonite powder metioned in this article is prepared by FJM200 fluidize bed supersonic-jet mill. By optimizing the main parameter such as specification of air spout, pressure of comminution, delivery rate and speed of grading wheel, we gained the superfine wollastonite needle of slenderness ratio at 12, whose medium diameter is 3.85μm. By calculation of group sampling, the average slenderness and the isometric diameter are fitted into a new parameter to more reasonablyattribute the geometry feature of superfine wallostonite needle powder. By testing the activation grade, infiltration grade, contact angle, and infrared absorption spectroscopy of modified powder, this thesis determined the efficient coupling agent NDZ-201 and the corresponding technology condition. This thesis has compared the effect of the microwave irradiation assistant modification with the traditional oil bath modification by testing the tensile-strength and impact-strength of the two kinds of complex materials which are made by separately filling the powder modified by above two different methods into ABS resin. . Finally it has researched and theoretically analyzed the microscopic pattern ,structure and mechanics of this two kinds material's interface.Experiments shows that fluidized bed supersonic jet mill has advantage in preparation of high slenderness ratio needle-like wollastonite powder. Titanate coupler agent NDZ-201 shows good effect upon surface modification in wollastonite superfine powder. The reasonable and economical addition dose is lml/lOOg. In the same condition the microwave irradiation modified powder filled ABS resin shows better mechanic property than that is prepared by traditional method. So the microwave irradiation modification is surely a effective assistant method.