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The processing and application of pom
by：CSSSLD
2021-01-23
Than strength and stiffness of POM and metal is very close to, its products more than 80% used to replace copper, zinc, aluminum and other non-ferrous metal manufacturing various parts and components, are widely used in automobile industry, machinery manufacturing, precision instruments, agriculture and daily products, etc.
Mainly in the automotive industry instead of copper production car axle shaft, planetary gear, engine fuel system pipeline, etc.
Injection molding processing factory POM non-toxic health and can be used for artificial heart membrane, pacemaker and artificial limb, etc. , in addition, POM can extrusion sheet, rod and tube and other products.
the weatherability of POM is not ideal, the atmospheric environment and sun exposure can make the molecular chain of degradation, the table of flour, crisp color change. POM used in outdoor, need to add appropriate uv absorber or antioxidants, in order to improve the weatherability of him. POM with excellent electric properties, the relative dielectric constant is almost not influenced by temperature and humidity, but its weather resistance is poor, so it's performance is better than other engineering plastics.
in general, forming good dimension stability of POM products, the less affected by temperature and humidity. But if the products using the environment temperature is higher, but heat treatment was carried out on the products, in order to improve the dimension stability of the products. POM crystallization ability, fast solidification rate, solid surface hardness and rigidity, small friction coefficient, quick demoulding. But improper control has contributed to molding difficult, product surface appear fold, marking, welding scar, etc. , thus forming, should increase the speed of mold filling, control the mold temperature above 80 ℃.
POM is thermoplastic, can undertake injection molding, extrusion, blow molding, pressing forming, etc. The most widely in injection molding applications. Extrusion molding is used in the production of the material, such as sheet, rod, made by mechanical processing of the final product. No matter use which kinds of processing methods, all need to pay attention to molding process properties of POM. POM high crystallinity, melting temperature range narrow, with obvious melting point. Its melting point the rheological behavior of non-newtonian model, the melt viscosity are sensitive to shear rate.
POM thermal stability is poor, the processing temperature should not be greater than 250 ℃, if the temperature is too high, heating time is long, will cause material decomposition, strong pungent formaldehyde gas escape, further oxidized to discoloring the products produce formate and bubbles. So when processing POM products, under the condition of guarantee the sufficient plasticizing should try to reduce the temperature, shorten the retention period of material at high temperature. POM bibulous rate is low, the general is 0. 2% - 0. 25%, thus forming not dry before treatment.
all polyformaldehyde organic solvent resistance performance is very outstanding, under 70 ℃ has not yet found effective solvent, after the temperature greater than 70 ℃, can effectively by some aldehydes, amide, dissolved. All polyformaldehyde only ability weak base, acetal copolymer resistant to strong alkaline detergent, but they are not resistant to strong acid and strong oxidant; POM is lower than the PA, ABS, water imbibition in 0. 2% - 0. About 25%. Even in the humid environment can still keep good dimensional stability.
for forming large thin-walled products and injection molding processing products require a higher surface quality or resin adsorption of water on the surface, drying drying temperature control in the 90 - must be conducted Around 100 ℃, for about 5 h. POM high crystallinity, molding shrinkage ratio is bigger, which is about 1. 8% - 3. 5%, so the processing POM products should be appropriately extended when the holding time, prevent shrinkage, to ensure the stability of the product size and shape.
more excellent articles: polycarbonate shaping, click directly.
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changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
the weatherability of POM is not ideal, the atmospheric environment and sun exposure can make the molecular chain of degradation, the table of flour, crisp color change. POM used in outdoor, need to add appropriate uv absorber or antioxidants, in order to improve the weatherability of him. POM with excellent electric properties, the relative dielectric constant is almost not influenced by temperature and humidity, but its weather resistance is poor, so it's performance is better than other engineering plastics.
in general, forming good dimension stability of POM products, the less affected by temperature and humidity. But if the products using the environment temperature is higher, but heat treatment was carried out on the products, in order to improve the dimension stability of the products. POM crystallization ability, fast solidification rate, solid surface hardness and rigidity, small friction coefficient, quick demoulding. But improper control has contributed to molding difficult, product surface appear fold, marking, welding scar, etc. , thus forming, should increase the speed of mold filling, control the mold temperature above 80 ℃.
POM is thermoplastic, can undertake injection molding, extrusion, blow molding, pressing forming, etc. The most widely in injection molding applications. Extrusion molding is used in the production of the material, such as sheet, rod, made by mechanical processing of the final product. No matter use which kinds of processing methods, all need to pay attention to molding process properties of POM. POM high crystallinity, melting temperature range narrow, with obvious melting point. Its melting point the rheological behavior of non-newtonian model, the melt viscosity are sensitive to shear rate.
POM thermal stability is poor, the processing temperature should not be greater than 250 ℃, if the temperature is too high, heating time is long, will cause material decomposition, strong pungent formaldehyde gas escape, further oxidized to discoloring the products produce formate and bubbles. So when processing POM products, under the condition of guarantee the sufficient plasticizing should try to reduce the temperature, shorten the retention period of material at high temperature. POM bibulous rate is low, the general is 0. 2% - 0. 25%, thus forming not dry before treatment.
all polyformaldehyde organic solvent resistance performance is very outstanding, under 70 ℃ has not yet found effective solvent, after the temperature greater than 70 ℃, can effectively by some aldehydes, amide, dissolved. All polyformaldehyde only ability weak base, acetal copolymer resistant to strong alkaline detergent, but they are not resistant to strong acid and strong oxidant; POM is lower than the PA, ABS, water imbibition in 0. 2% - 0. About 25%. Even in the humid environment can still keep good dimensional stability.
for forming large thin-walled products and injection molding processing products require a higher surface quality or resin adsorption of water on the surface, drying drying temperature control in the 90 - must be conducted Around 100 ℃, for about 5 h. POM high crystallinity, molding shrinkage ratio is bigger, which is about 1. 8% - 3. 5%, so the processing POM products should be appropriately extended when the holding time, prevent shrinkage, to ensure the stability of the product size and shape.
more excellent articles: polycarbonate shaping, click directly.
http://www。 csssld。 cn//html/2017/Info_1019/703。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
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