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Curing agent to improve injection molding processing performance
by：CSSSLD
2021-02-03
There are all kinds of EP, commonly used varieties for synthesis of bisphenol A with epichlorohydrin, for linear structure, the black liquid, can be used as bonding agent.
Due to the EP macromolecular contain reactive groups, crosslinking curing add hardener.
Opening agent is mainly used for polyene of resin with low polarity, they produce membrane products, due to very easy to generate static electricity is difficult to speak.
for polyene type of resin, especially the PP, vulnerable to copper in the injection molding processing speed lead to thermal catalytic oxidation degradation. Therefore, copper may exist for some occasions. Copper resistance agent is a kind of can reduce copper catalytic degradation of resin additive. Fisheye for some not melting on the plastic film products hard points, affect the quality of the film.
the precision of the plastic products refers to the actual size or shape and plastic product designer to design the size or shape of the difference between, both difference is smaller, its products, the higher the precision. The precision of plastic products can be divided into the processing precision and the use of two kinds of precision. Plastic products of injection molding processing accuracy refers to the result of the machining process of the reason of size tolerance or deformation, this is the most important factor of decision precision plastic products.
the use of plastic products precision is said its products after processing the size tolerance or the deformation. The use of plastic precision with the raw material itself. Such as secondary crystallization, water absorption, heat expansion and creep and other factors, in addition, the relationship with the use of the environment is very big, also in high temperature, damp and external forces under the influence of environmental factors such as, can make its use precision.
the related features of plastic raw material itself is to determine the size of the molding products accuracy is the most main factor. Caused by the raw material size tolerance generally accounts for 70% of the whole size tolerance - 90%, the rest of the mold, and other causes. Plastic raw material for plastic products can affect the precision of the main performance are: shrinkage, water absorption, coefficient of thermal expansion and creep, and so on. The plastic shrinkage had the greatest influence on the dimension precision of plastic products.
plastic melt from the cylinder into the forming mold and the temperature drops rapidly, cause heat bilges cold shrink, this part for hot and cold contraction. Plastic cold heat shrinkage and temperature difference in expansion coefficient of the material and processing related to change. For crystalline plastics, because crystalline phase change caused by the contraction of the biggest, is much bigger than cold heat shrinkage, generally accounts for more than 90% of the whole shrinkage rate. Crystalline resin in the products from the molten state cooling solidification, as the macromolecular crystallization, than with the decrease of the volume contraction. Products of the higher crystallinity, crystal caused by shrinkage. In addition, the high crystallinity of materials products increase compactness, the linear expansion coefficient decreases, and the shrinkage rate reduced.
in the process of plastic processing, liquid will produce shear stress direction, forcing chain orientation, the higher the injection velocity, the stronger the molecular orientation. Forcibly stretch orientation, the flow direction was frozen when cooling down, but at the same time large molecules and restore curly trend, thus to produce contraction in orientation direction. This contraction caused by molecular orientation gradually disappear and the size of the internal stress, the greater the stress is orientation contraction. Plastic from the orientation of contraction in the of the difference of the shrinkage of the material flow direction and vertical direction, the higher the degree of orientation, shrinkage rate, the greater the difference between the average shrinkage rate is greater than the vertical direction of the flow direction of shrinkage.
more wonderful sharing: improve plastics processing performance, click directly.
or copy the link: http://www. csssld。 cn//html/2016/Info_0522/238。 HTML
nantong on plastic products factory's official website: http://www. csssld。 cn//
for polyene type of resin, especially the PP, vulnerable to copper in the injection molding processing speed lead to thermal catalytic oxidation degradation. Therefore, copper may exist for some occasions. Copper resistance agent is a kind of can reduce copper catalytic degradation of resin additive. Fisheye for some not melting on the plastic film products hard points, affect the quality of the film.
the precision of the plastic products refers to the actual size or shape and plastic product designer to design the size or shape of the difference between, both difference is smaller, its products, the higher the precision. The precision of plastic products can be divided into the processing precision and the use of two kinds of precision. Plastic products of injection molding processing accuracy refers to the result of the machining process of the reason of size tolerance or deformation, this is the most important factor of decision precision plastic products.
the use of plastic products precision is said its products after processing the size tolerance or the deformation. The use of plastic precision with the raw material itself. Such as secondary crystallization, water absorption, heat expansion and creep and other factors, in addition, the relationship with the use of the environment is very big, also in high temperature, damp and external forces under the influence of environmental factors such as, can make its use precision.
the related features of plastic raw material itself is to determine the size of the molding products accuracy is the most main factor. Caused by the raw material size tolerance generally accounts for 70% of the whole size tolerance - 90%, the rest of the mold, and other causes. Plastic raw material for plastic products can affect the precision of the main performance are: shrinkage, water absorption, coefficient of thermal expansion and creep, and so on. The plastic shrinkage had the greatest influence on the dimension precision of plastic products.
plastic melt from the cylinder into the forming mold and the temperature drops rapidly, cause heat bilges cold shrink, this part for hot and cold contraction. Plastic cold heat shrinkage and temperature difference in expansion coefficient of the material and processing related to change. For crystalline plastics, because crystalline phase change caused by the contraction of the biggest, is much bigger than cold heat shrinkage, generally accounts for more than 90% of the whole shrinkage rate. Crystalline resin in the products from the molten state cooling solidification, as the macromolecular crystallization, than with the decrease of the volume contraction. Products of the higher crystallinity, crystal caused by shrinkage. In addition, the high crystallinity of materials products increase compactness, the linear expansion coefficient decreases, and the shrinkage rate reduced.
in the process of plastic processing, liquid will produce shear stress direction, forcing chain orientation, the higher the injection velocity, the stronger the molecular orientation. Forcibly stretch orientation, the flow direction was frozen when cooling down, but at the same time large molecules and restore curly trend, thus to produce contraction in orientation direction. This contraction caused by molecular orientation gradually disappear and the size of the internal stress, the greater the stress is orientation contraction. Plastic from the orientation of contraction in the of the difference of the shrinkage of the material flow direction and vertical direction, the higher the degree of orientation, shrinkage rate, the greater the difference between the average shrinkage rate is greater than the vertical direction of the flow direction of shrinkage.
more wonderful sharing: improve plastics processing performance, click directly.
or copy the link: http://www. csssld。 cn//html/2016/Info_0522/238。 HTML
nantong on plastic products factory's official website: http://www. csssld。 cn//
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