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Strengthen the polyformaldehyde
by：CSSSLD
2021-02-03
Effect produced by the speed of the screw is to improve the speed, increase the shearing action of screw mixing effect, on the other hand, increasing the screw rotation speed can decrease the retention period of material, but the screw rotation speed nor too high, otherwise may cause temperature rise caused by friction heat increase screws.
Therefore the setting principle of screw rotation speed is guaranteed POM plasticizing completely under the condition of appropriately increasing the screw rotation speed, to ensure the quality of injection molding processing products.
glass fiber content on the properties of POM. Glass fiber content increases, the glass fiber reinforced POM improved the tensile strength, elongation at break decreased. When the glass fiber content in more than 5%, glass fiber reinforced the elongation at break of POM fell sharply, after glass fiber content in 10% glass fiber reinforced the elongation at break of POM changed little. Due to the high crystallization and nonpolar, POM and glass fiber adhesion is poor, so the addition of glass fiber can't raise the impact strength of POM.
glass fiber types and processing. For POM enhanced glass fiber can be a long fiber, can also be a staple, but it must be non-alkali glass fiber. Because the POM is nonpolar polymer, think in terms of glass fiber stick relay, glass fiber surface treatment agent should add some polar components, good heat resistance. The surfactant used in high temperature does not cause POM degradation reaction, also can form good combination.
screw combination and the screw rotation speed. For easy decomposition of the polymer blend extrusion, the principle of screw combination is to ensure that provide a certain amount of shearing action and mixing effect, and to avoid local overheating, especially of glass fiber reinforced POM blending extrusion, glass fiber and screw, glass fiber and screw friction between simplified can produce a lot of heat. To avoid local high temperature cause the decomposition of POM, the screw on the combination of the kneading elements, should press scattered combination, the principle of uniform shear, will more than kneading elements combination, reduce friction heat concentration, can be appropriate to reduce the amount of the kneading elements again, to reduce the residence time of material in the screw, avoid POM thermal oxidative cracking.
blending temperature on the influence of the injection molding processing products. The disadvantage of decomposition, because POM high temperature in the process of blending, screw extruder temperature setting is the important factors that affect product quality. Blending temperature low, poor to package effect of glass fiber, glass fiber caused by the leakage, high temperature is the cause of POM decomposition. So on melt blending temperature setting should be in place to ensure that the POM is decomposed into principle, control near the temperature of the melting point is advisable.
glass fiber and POM blend, can significantly improve the tensile strength of the POM, full strength and thermal deformation temperature. Like to join in POM 25% glass fiber, the tensile strength of the POM 1 times, 127 - 147 mpa, close to the level of glass fiber reinforced PA6 homopolymerization POM thermal deformation temperature from 136 ℃ to 170 ℃, copolymerization POM increased from 110 ℃ to 163 ℃. The preparation of glass fiber reinforced POM. Preparation process of glass fiber reinforced POM and other modified engineering plastics, don't need special equipment, but as a result of POM high temperature decomposition this characteristic, the production process of different controlling factors.
more excellent articles: the application of modified polyester, click directly.
http://www。 csssld。 cn//html/2016/Info_1108/396。 HTML
nantong on suye's official website: http://www. csssld。 cn//
glass fiber content on the properties of POM. Glass fiber content increases, the glass fiber reinforced POM improved the tensile strength, elongation at break decreased. When the glass fiber content in more than 5%, glass fiber reinforced the elongation at break of POM fell sharply, after glass fiber content in 10% glass fiber reinforced the elongation at break of POM changed little. Due to the high crystallization and nonpolar, POM and glass fiber adhesion is poor, so the addition of glass fiber can't raise the impact strength of POM.
glass fiber types and processing. For POM enhanced glass fiber can be a long fiber, can also be a staple, but it must be non-alkali glass fiber. Because the POM is nonpolar polymer, think in terms of glass fiber stick relay, glass fiber surface treatment agent should add some polar components, good heat resistance. The surfactant used in high temperature does not cause POM degradation reaction, also can form good combination.
screw combination and the screw rotation speed. For easy decomposition of the polymer blend extrusion, the principle of screw combination is to ensure that provide a certain amount of shearing action and mixing effect, and to avoid local overheating, especially of glass fiber reinforced POM blending extrusion, glass fiber and screw, glass fiber and screw friction between simplified can produce a lot of heat. To avoid local high temperature cause the decomposition of POM, the screw on the combination of the kneading elements, should press scattered combination, the principle of uniform shear, will more than kneading elements combination, reduce friction heat concentration, can be appropriate to reduce the amount of the kneading elements again, to reduce the residence time of material in the screw, avoid POM thermal oxidative cracking.
blending temperature on the influence of the injection molding processing products. The disadvantage of decomposition, because POM high temperature in the process of blending, screw extruder temperature setting is the important factors that affect product quality. Blending temperature low, poor to package effect of glass fiber, glass fiber caused by the leakage, high temperature is the cause of POM decomposition. So on melt blending temperature setting should be in place to ensure that the POM is decomposed into principle, control near the temperature of the melting point is advisable.
glass fiber and POM blend, can significantly improve the tensile strength of the POM, full strength and thermal deformation temperature. Like to join in POM 25% glass fiber, the tensile strength of the POM 1 times, 127 - 147 mpa, close to the level of glass fiber reinforced PA6 homopolymerization POM thermal deformation temperature from 136 ℃ to 170 ℃, copolymerization POM increased from 110 ℃ to 163 ℃. The preparation of glass fiber reinforced POM. Preparation process of glass fiber reinforced POM and other modified engineering plastics, don't need special equipment, but as a result of POM high temperature decomposition this characteristic, the production process of different controlling factors.
more excellent articles: the application of modified polyester, click directly.
http://www。 csssld。 cn//html/2016/Info_1108/396。 HTML
nantong on suye's official website: http://www. csssld。 cn//
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