Research On The Performance,Process And Application Of Composite Fibers Of Nometallic Minerals And Plant

This paper describes the field of advanced materials science,which is a cross technology subject combining non-metallic mining industry and papermaking industry. Seek for the special fiber raw material with the sufficient sources,cheap price,good paper property and less environment pollution to develop the paper raw material supplying and the choice by multiple strategies.The study on their application in functional papers to push sustainable development of China's P&P industry etc.is of great significance.The study is a key to success of the new nonmetallic mineral/plant-composite fibers.Starting from a study on the physicochemical characteristics of the nonmetallic mineral fibers of the wollastonite,sepiolite,fibrous brucite etc.and facing to the systemic experiment research on the dispersion,purification,dissociation,modification and the preparation of mineral/plant-composite fibers,the paper production process and their performance test,that results showed are the main research results:1.The physicochemical characteristics of the wollastonite,sepiolite,fibrous brucite and plant fibers have been studied systematically.The chemical and the mineralogical compositions,surface electricity,morphological features and the crystal structure of the mineral fibers were studied in detail,which provides theoretical direction for the fiber composite materials.2.The modification of the wollastonite and the dispersion,purification,dissociation of the fibrous sepiolite,fibrous brucite have been studied systematically,which lays the foundation for the fiber composite materials.(1)The CPAM is used to modify the wollastonite.The surface potential of the wollastonite decreased.the strength combined with plant fibers and mineral fibers has increased.(2)It can be seen after the mechanical agitation and method by ultrasonic using the dispersing agent of sodium hexametaphosphate(SHMP) the fibrous sepiolite will disperse completely.(3)It can be seen by the soaking treatment of OT and by the mechanical agitation the fibrous brucite will disperse completely.3.The paper production process test have been made systematically by the mineral/plant-composite fibers.The compound modification test of composite minerals(modified wollastonite/fibrousbrucite,modified wollastonite/sepiolite,fibrous brucite/sepiolite) and plant fibers initiates both at home and abroad.It achieves better effect in the practical application.(1) The addition of mineral fibers(wollastonite,sepiolite,fibrous brucite) to the paper makes the disk performance better than the general common packings calcium carbonate,talc.The experimental results show that is not the general common packings,the mineral fibers react on the fiber's effective.(2)The wollastonite,especially the modified wollastonite doping obviously improves the performance of the disk samples when contained 30%(wollastonite)～40%(modified wollastonite).It achieves better effect in the modified wollastonite.Therefore the modified fibrous of the wollastonite play an important role in bonding strength of composite fiber and in the performance of the disk.(3)The different composite mineral fibers of sepiolite/modified wollastonite,fibrous brucite/wollastonite,fibrous brucite/modified wollastonite and fibrous brucite/sepiolite (1:1 ratio),were obviously better than that of single mineral fiber in compound of plant fiber to the disk performance.The reason of improvement the disk performance is due to the synergism of the mineral fibers when contained 30%～40%.(4)SEM images show that the distribution of the mineral fibers in the disk samples is even.The development of network structure of the mineral/plant-composite fibers is advatageous to replace partial plant short fiber.4.The pilot-test result on a 200mm fourdrinier paper machine showed that a good comprehensive properties can be obtained under the suitable condition of the composite fibers.Modified wollastonite content up to 8%compared with talcum powder,a good comprehensive properties can be obtained is advatageous to cut down corresponding rates of the plant fibers usage.The process has better economic and environmental benefits.Modified wollastonite mixed sepiolite or fibrous brucite at appropriate proportion into the paper production process,it keeps its quite good physical properties.Besides,the ash content rose.5.On the basis of above,this essay also discusses the modification mechanism of wollastonite,the dispersion and dissociationand mechanism of sepiolite,fibrous brucite and the functionary interracial mechanism of the composite fibers.