Black masterbatch used in plastic products seventeen ask?

In the plastic molding process, the black masterbatch almost everyone used for staining for anti-aging, for conductive products, many of the problems arising from the use of often haunt us. Xiao Bian now some issues of common concern were discussed, we hope to bring you a harvest.
Black masterbatch which is made of material?
Black masterbatch materials are: A carbon black; B carrier carbon black; C carbon black wetting agent; D carbon black dispersant; E other processing aids......

Black masterbatch with carbon black
According to international classification, China has more than 30 varieties. Divided into rubber and non-rubber two categories. Carbon black in rubber is mainly wear black, can effectively improve the wear resistance of rubber tires; non-rubber carbon black, really black as carbon black masterbatch was only a few. Channel black to the most widely used in plastics, mainly due to its rich source of high purity, particle size small. Among these, in turn divided into high carbon black pigment (diameter 9-17mm), carbon black pigment (diameter 18-25mm) and low pigment carbon black (particle diameter 26-37mm). Due to the different varieties of carbon black, prices vary widely. Carbon black particles due to its having a more lively, rarely primary particles exist, almost all have a certain particle size range of particles agglomeration exist.

Carbon black carrier is how is it?
The carrier material is carbon black carrier. Usually what plastic raw materials, the carrier will use what materials. Such black masterbatch manufacturing and plastic raw materials good compatibility. Such as: PS (polystyrene) plastic products, the use of black masterbatch carrier is PS. For polyethylene plastic, the carrier is polyethylene. However, generally used LDPE (high pressure polyethylene), LDPE carrying carbon black as the strongest, and good processability. Other polyethylene HDPE and LLDPE produced only low concentrations of black masterbatch. For PP (polypropylene) plastic products, can only be used as a carrier of PP and LDPE black masterbatch, but can not use HDPE and LLDPE and other plastic as the carrier of black masterbatch. Of course, we also use recycled materials as carrier of black masterbatch.

Why carbon black wetting agent need?
Carbon black proportion of about 2g / cm, due to the small particle size carbon black, performance density is very small, it is fluffy, it seems very light. To successfully processed, it must first carbon black wetting. Select the wetting agent is critical. To reduce costs, the extensive use of white oil or wax products like corporate few, will seriously affect the strength of the processed products.

Carbon black masterbatch dispersant use what?
Points and inorganic dispersant types of organic dispersant. High-grade black masterbatch organic dispersant, mainly for higher environmental requirements of plastic products, such as drip irrigation products. Low-grade black masterbatch using an inorganic dispersant, commonly used with calcium carbonate. Masterbatch packaging from judgment, only half a bag of 25 kg is definitely an inorganic dispersant; sackful of using an organic dispersant black masterbatch. Inorganic dispersant black masterbatch can greatly reduce costs, but it is deadly calcium carbonate having accelerated aging of the plastic effect.

Black masterbatch processing aids also need to do?
Of course it needs. Smooth processing necessary to select the antioxidants, internal lubricants, external lubricants, antistatic agents, and modifiers.

What are black masterbatch processing methods?
There are three types: single screw method, a twin-screw method and secret love Method. Single screw method: Banliao After materials are mixed, extruded from a single screw extruder strand pelletizing, the concentration of carbon black is generally 18-20%, backward technology, poor environmental conditions, production site, is being phased out process, do not rule out Some small start-ups processing factories still use the same method. Twin-screw method: After Banliao materials were blended by a twin screw extruder brace or water ring granulation, since a twin-screw kneading machine itself limited capacity, the concentration of carbon black masterbatch is generally 25-32%. Mixing method: Use Banliao the material mixing, kneading mixer was added, and then fed by the feeder twin screw extruder, the water ring or underwater pelletizing, the concentration of carbon black masterbatch generally in 40- 45%.

Masterbatch processing methods for performance influential?
Yes. Obviously, the mixing method improves the carrier carrying capacity of carbon black, and carbon black can be more evenly into the carrier. Mechanical kneading mixer to play advantage, the agglomerated particles broken, so that the carbon black particles aggregate size is greatly reduced, carbon black masterbatch particle size distribution and is not a substitute for the other two methods.

Black masterbatch has outstanding performance in what areas?
Plastic products dyeing, black masterbatch only 0.6% -0.8%, will be very odd black, and then more and more will not be black. According to experimental data, in the Xinjiang region for outdoor use products, such as the need to rely on black masterbatch aging, as long as the use of high-quality black masterbatch (rather than back to the material as a carrier, the kind Baiyou Run wet, calcium carbonate dispersion, etc.) carbon black content in the product to reach 2-2.5%, that is: every 100 kg of raw material, 5-6 parts (by weight) containing 40% carbon black masterbatch, the role played by far more than any anti-aging products product life can reach more than 10 years. That is why drip irrigation products, water products, communications cable products are black. In addition, the carbon black products of increased strength, conductivity enhancing other aspects of special contribution.

The actual production does not seem to use so many parts of the black masterbatch?
Yes. The actual production of about 2 parts of general use black masterbatch, and then add anti-aging agent, the use of carbon black, anti-aging and anti-aging synergy, to reduce product costs. Further, the length of time in the outdoors, may require product life, but also determines the amount of black masterbatch appropriately reduced, provided that the carbon black products must form a continuous phase, i.e. carbon black "film" protective plastic. Such as adding little black masterbatch, carbon black-phase (ie, a high concentration of small piece portions) discontinuity in the article, in the phase to phase boundaries, the most vulnerable of plastic molecules by ultraviolet direct hit, accelerated aging reaction with oxygen, this when carbon black products as impurities, not as without. Phase boundary phase is less than 280mm, UV light can escape combat, products are safe.

How to judge from the appearance of black masterbatch quality?
Good quality black masterbatch luster and softness and hardness. Oil too light, indicating that put too much oil, shiny dark legend is back to the carrier material or calcium carbonate excess. Good quality black masterbatch biting, soft but crisp. Description is too soft organic dispersant too soft and loose low concentration of carbon black containing calcium carbonate described more brittle described carbon black content is too high, or the carrier material is back.

After using a small black masterbatch product surface pockmarked face is how is it?
If Pock is small sharp projections described dispersion masterbatch products processing equipment capacity is limited, carbon black masterbatch agglomerated particles can not be uniformly cut, you should use a lower concentration of black masterbatch; or excessive carbonate masterbatch calcium and too much white oil, blankets screw and twin screw extruder, extrusion under high pressure to form a small stiff block, unable to disperse. If Ma face is sunken, the masterbatch is caused by volatile small molecules described more white oil.

Black masterbatch containing calcium carbonate can use?
To the whole. First, if the black masterbatch fineness 1000 mesh calcium carbonate content of less than 10%, no outdoor exposure requirements for products, is a good choice, low prices. Product appearance of shiny, uniform dispersion of carbon black processing, blackness is not affected, the product of the intensity was less affected. If calcium carbonate is less than 1000 mesh fineness, luster may appear bleak, rough surface, product strength. If the object of the 1000 amount of calcium carbonate exceeds 10%, the product surface matte gray hair, black is not enough, the article strength. Secondly, in any anti-aging requirements for outdoor use products containing calcium carbonate are bad, depending on the product life choose whether to use. Finally, the use of this type of black masterbatch need willing to use high shear-capable device.

Choose a high carbon black content of black masterbatch to reduce costs it?
High carbon black content, the more difficult the dispersion means, shearing equipment capacity requirements increase, the need with large aspect ratio, with mixing section, abrasion resistant screw, depending on equipment availability. Good effect of mixing equipment, the use of high concentrations of carbon black masterbatch, the corresponding amount is less, of course, money. For a limited mixing capabilities of the device, the use of high concentrations of carbon black masterbatch dispersion is uneven, pitting prominent, resulting in a higher rejection rate, worth the candle. Perhaps when the production of carbon black content of 40% of the masterbatch is not normal, instead of 35%, the effect is very good.

Black masterbatch to add anti-aging agent is how is it?
This black masterbatch processing related to store and use. China's production of plastics with carbon black, both highly pigmented, low pigment or dye, there is a higher oxygen-element problems. Relevant data reported up to 3-8%. This directly affects the masterbatch processing and storage process, the oxide support of aging, aging of this event, will lead directly to future use of the masterbatch product, premature aging, the induction period oxidation test proved this point. To prevent and mitigate this phenomenon, take appropriate amount of anti-aging agent, it is the best choice to ensure the quality of black masterbatch.

Such as the use of carbon black rubber with abrasion resistant black masterbatch, what is wrong?
This masterbatch, wear is the first one, there are some anti-aging effects, poor dyeing power, the price is very cheap. The main thing is enough to wear your device.
Yujie Conclusion
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