Fabrication Of Water-based Adhesives For The Interfacial Adhesion Between Polypropylene Nonwoven Fabrics And Inorganic Materials

In this thesis, the two water-based chlorinated polypropylene adhesives via the dissolution dispersion and the mechanical ball-milling dispersion approaches for the bindings between polypropylene fabrics and inorganic materials were developed. The effects of the dosaging of emulsifier, emulsification temperature and emulsification time, the ball-milling auxiliary, and the milling time on the latex particle size, viscosity, peel strength, the storage and the freezing-thawing stabilities were investigated. The effects of film-forming temperature and film-forming time, doses of mixed monomers on peel strength of composite material and the effect of different on the peel strength were also carefully studied.The latex particle morphology, the rheological behaviour and peel strength of the water-based adhesives were investigated with scanning electron microscope, MASTERSIZE2000Laser particle size analyzer, AR2000shear rheometer and HD034N peel strength tester. The grafting of acrylic monomers onto the chlorinated polypropylenes were testified with Infrared resonance spectra and Thermogravimetry. The main findings and conclusions are as follows:First of all, the chlorinated polypropylene emulsion adhesive was manufactured successfully with the anionic and non-ionic surfactants as mixed emulsifiers. The optimal process conditions are that, the mass ratio of chlorinated polypropylene:emulsifier=100:6, emulsification temperature60℃and time3h.Secondly, the dose of emulsifier is the major dominant factors which influenced the emulsion viscosity and the latex particle size. As the increasing of content, the adhesive viscosity was increased with increase of emulsifier dose, and vice verse for the latex particle size. The peel strength of the adhesion between polypropylene fabrics and inorganic materials can be maximized when the particle size and the viscosity of the adhesive are counter-balanced.Thirdly, the disperse stability of the emulsion adhesive was poor, when only acrylic acid was used to be grafted on the chlorinated polypropylene, while the stability was improved if the mixture of acrylics were used. The maximal peel strength was obtained at the grafting yield of30%with the acrylic mixture on the chlorinated polypropylene.Fourthly, the average particle size at40μm can be achieved with the nonionic surfactant and ester plasticizer as the milling auxiliary, and the milling time12h.Fifthly, the film-forming temperature and time showed a decisive influence on the peel strength. The increase of film-forming temperature led to an increase of peel strength for the predetermined time. The peel strength was usually reached constant after3-day treatment.Sixthly, as we can see from the destructional form of composite material, when we choose polypropylene nonwoven fabrics as base material, the major destruction mode was cohesive failure of polypropylene nonwoven itself for the polypropylene-inorganic material binding system while the cohesive failure and debonding of adhesive layer often happened for the polypropylene monofilament cloth--inorganic material binding system. In comparison with polypropylene monofilament cloth, the poor tensile strength accounts for the cohesive failure of polypropylene nonwoven fabric.Finally, although the peel strength and the destruction mode of the water-based adhesives and the solvent-based adhesives were slightly different, the water-based adhesive can surely replace the some solvent-based adhesives on the market for the binding between polypropylene fabrics and inorganic material.The feature and innovation of the thesis are included in the following aspects:Fist of all, the chlorinated polypropylene emulsion adhesive was firstly prepared by the dissolution dispersion method to be applied for the adhesion between polypropylene fabrics and inorganic materials.Secondly, n-butyl acetate solvent, no harm for people health, was used to dissolve the chlorinated polypropylene, and the solvent was further removed via vacuum distillation, and the content of volatile organic compounds was minimized.Thirdly, the mechanical ball-milling was firstly applied to manufacture the water-based chlorinated polypropylene adhesive for the adhesion between polypropylene fabrics and inorganic materials.