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Different blending ratio of plastic alloy

by:CSSSLD     2021-01-23
In the injection molding processing temperature is 245 ℃, great influence on mixing time of polyolefin-g-mah/barrier property, when mixing time is 3 min, polyolefin-g-mah/transmittance of several kinds of nonpolar solvent is very low and shows good barrier property, and the mixing time lengthened to 5 min, the significant increase in solvent transmittance, barrier property of blend is reduced. The characteristics of HDPE/PA6 is a good barrier property, low hygroscopicity, good low temperature toughness.

due to poor material mixing plasticization, especially bad for PA6 and compatibilizer, the reaction between the two phase interface binding force is not strong, it's also worth pointing out is for different PA6, HDPE blend system of the extrusion temperature is different. Melt in the blending system of two phase flow, the dispersed phase spherical particles needs to be appropriate shear, can be draw texturing. Shear force is too small, not enough to make the PA6 dispersed droplet orientation, deformation, stretching, shearing; Shear force is too large, and can make the dispersed phase droplet break into tiny droplets evenly and PA6 were granular distribution.

at 230 ℃, the viscosity of the HDPE is less than the PA6 viscosity, viscosity ratio > 1, two components HDPE continuous phase disperses PA6. Shearing action makes the possibility of PA6 dispersed droplets is small, and the trend of the stretching strip increase, so the PA6 in HDPE matrix distribution is layered structure. Some people think that the bigger the difference in viscosity between, the longer the flow distance, interface shape change is more significant, when the temperature higher than 242 ℃ < 1, the PA6 melt are more likely to be pulled, broken into small size scattered drops in HDPE.

the formation of the layered structure of the layer thickness has certain requirements, the layer thickness is associated with the drawing of the dispersed phase size and forming stage, the particle size of the dispersed phase in 0. 5 - It is advisable to 50. Particle size of the dispersed phase size is completely determined by the shear force size, luo gan rotational speed is low, the shear force is small, many scholars study shows that the screw speed in 30 or so, can obtain good layer structure.

melt extrusion temperature on the influence of shape and structure of alloy. Extrusion problems at 230 ℃, PA6 dispersed phase shows clear layer, dispersed in continuous phase, HDPE PA6 phase zone size is large, or more layers, and layer thickness to 5 - 20. When the temperature is 240 ℃, the PA6 is droplet distribution in HDPE matrix. According to polymer layered flow principle of minimum energy dissipation, high roughness surrounded by low viscosity component composition the skin-core structure of smaller than the energy of the flat interface needs.

HDPE/PA6 alloy, PA6 content increased, the tensile strength of the alloy increase, but the impact strength decreased, the change of the elongation decrease with PA6 content rise before. Elongation at break is the mechanical properties of the interface is very sensitive. Due to compatibility agent must have, the less content of PA6, as compatilizer full reaction, phase interface reaction is strong. High elongation at break, when continue to increase in the amount of PA6, two-phase q didn't have enough solubilizer, phase interface binding force, results in the decrease of elongation at break.

, the greater the difference in relative viscosity between two phase interface morphology change, the greater the visible different forms of injection molding processing temperature of alloy is put in bigger difference. When determining the temperature of the blending extrusion, rheological properties of each composition were analyzed, and different relative molecular mass of the rheological properties of HDPE and PA6 were different. Temperature effect on HDPE and PA6 melt viscosity are different. PA6 viscosity with temperature rise rapidly falling, and HDPE viscosity decreasing speed is very slow, at 242 ℃, the viscosity of polymer are the same.

blending body length of stay in the screw will affect the HDPE - The morphology of PA6 alloy structure. Incompatible blending system of particles, fibers, the layered structure, the morphology of continuous phase structure, the inherent relation between the viscosity ratio, composition and mixing time is determined by the combined effect of. Material under the condition of different blending the residence time of influence on the shape and structure of alloy is not necessarily the same, but in a certain range, the change is not very big.

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