Dissolution Of Tremolite Fibre And Its Application Study In PP

Tremolite is a kind of fibrous silicate mineral material, and it is mainly used in ceramic industry as a fast firing energy saving materials at low temperature. But some researchs show that, mineral fiber with certain length diameter ratio has enhancement function to polymer material,it can improve the mechanical properties of polymer. This paper studies a method of dispersion to prepare tremolite fibers, then we modify its surface and fill it into polypropylene resin. Mechanical property tests show that, the tremolite fibers have enhancement effect to polypropylene resin.The releasable study of tremolite find that acid treatment, surface active agent, and the motheds of mechanical force application have significant influence on the length diameter ratio of tremolite fibers and single fiber content. Because of their osmosis and dispersant effect, Na3PO4, NNO and CTAB are beneficial to the debonding of tremolite fibers, and the NNO has the best effect. Among the breaking plants, colloid mill with wet shear force has good defiberization effect, and other dry mill with striking force and impact force are not suited to protect the crystal form of tremolite; and the dilute acid can weaken the bonding between the fibers to a certain degree, which contributes to the release of tremolite. Through the optimizing experiments of the variety of surfactant, dispersion equipment selection and releasable technology, the prepared tremolite fiber's length diameter ratio reach46.9, and the single fiber content is69%.The surface modification research of tremolite fibers show that silane coupling agent exerts good modification effect on active ratio, sedimentation volume and viscosity, and the effect is best when the usage is1.2%. Infrared and thermal analysis results show that hydroxyl group on the surface of tremolite and silanol of silane coupling agent form siloxane bonds, which indicate that there is a chemical reaction of silane coupling agent with tremolite fibers surface, and the chemical adsorption quantity of silane coupling agent is1.0%.The mechanical property research of PP filled with tremolite fibers show that the notch impact strength of un-modified tremolite/PP composite decrease slightly, but the tensile strength and bending strength increase. And the modified tremolite/PP composite in the tensile strength, notched impact strength and bending strength are improved. When the loading level of tremolite fibers is20%, compared with pure PP, tremolite/PP composite's tensile strength is increased by21.2%, notched impact strength increased by7.5%, and bending strength increased by51.4%. The mechanical property research of PP filled with tremolite and CaCO3whose sueface is modified show that at the sameloading level tremolite/PP composites's tensile strength, impact strength and bending strength are higher than those of CaCO3/PP composites.