The Preparation And Application Studies Of Modified PP/HDPE Spunbonded Nonwovens And 3D Stereoscopic Embossed Hot-air PP/HDPE Nonwovens

Firstly, the PP/HDPE modified, spunbonded nonwovens with different surface density were prepared by adding ethylene-octene block copolymers (OBC), titanium dioxide, antioxidants into polypropylene (PP) and high-density polyethylene (HDPE) raw materials while the melting extrusion, composite spinning, and hot-rolled reinforcement techniques were applied. The structure, morphology, breaking strength, elongation at break, bending resistance, suction rate, liquid holdup, diffusion characteristics and pH value were studied by means of a set of test. The results showed that compared to the normal fibers the new PP/HDPE modified, spunbonded nonwovens have a fiber morphology of PP/HDPE sheath-core type, increased surface density and thickness, improved uniformity, increased longitudinal and transverse rupture strength, reduced elongation value at break, improved bending resistance, increased suction rate and liquid holdup value, reduced loss amounts, decreased liquid diffusion area and diffusion time, reduced fecal losses, and similar pH value.Secondly,3D stereoscopic embossed PP/HDPE nonwovens were prepared by adding ethylene-octene block copolymers (OBC), titanium dioxide, antioxidants into polypropylene(PP) and high-density polyethylene (HDPE) raw materials while melt extrusion, composite spinning into the net, hot-air through bonding, hot-rolled reinforcement and 3D stereoscopic calendaring techniques were applied. The structure, morphology, breaking strength, elongation at break, bending resistance, the suction rate, liquid holdup, diffusion properties and pH value were studied by means of a set of test. The results showed that the 3D stereoscopic embossed PP/HDPE nonwoven presents a "oval" embossed structure, fiber fleeciness at embossed, high porosity, indented dense structure, strong three-dimensional sense. Compared to the plain hot-air PP/HDPE nonwovens, its longitudinal breaking strength improved 6.0%; transverse breaking strength improved 13.0%; elongation at break and bending resistance decreased; contact angle increased 5.1°; its mean suction ratio, liquid holdup, loss amounts and planar diffusion properties were significantly improved.Thirdly, the three kinds of diapers samples were made by using the self-made modified PP/HDPE spunbonded nonwovens with different surface density as topsheet. A set of charactors of the dipers such as liquid glide length of diapers, topsheet run-off, rewet, diffusion length, diffusion rate, pH value and microorganisms affection, etc. was studied. The results showed that with the increasing of the amount of saline the liquid glide length, planar diffusion properties, topsheet run-off and rewet of the diapers samples increased. When the saline fluid volume is 200 mL, the 3# sample diaper has a glide length of 200 mm, a topsheet run-off of 7.42 mL, a rewet of 0.986 g, a pH value of 6.88, and its microbial indicators conform to the requirements of GB 15979-2002 standard.Lastly, diaper sample was made by using 3D stereoscopic embossed PP/HDPE nonwovens as topsheet. The liquid glide length, topsheet run-off, rewet, diffusion length, diffusion rate, pH value and microorganisms affection of the diper samples were studied. The results showed that with increasing of the amount of saline, the liquid glide length, planar diffusion properties, topsheet run-off and rewet of the diaper samples increased. When the saline fluid volume is 200 ml, the 2# diaper has a glide length of 184 mm, a topsheet run-off of 0.08 mL, a rewet of 4.452 g, a liquid diffusion length of 278.0 mm. Compared to the diapers using plain hot-air PP/HDPE nonwovens as topsheet, its liquid glide length and topsheet run-off decreased, diffusion rate and rewet increased, pH value and microbial indicators conformed to the requirements and it presented an excellent overall performance.