Black Masterbatch It is made of carbon black, carrier and additives injection molding process and other parts of the production of color masterbatch. In the plastic molding process, the black masterbatch is almost everyone used for dyeing, for anti-aging, for conductive products, Black Masterbatch the use of many problems often bother us. Xiaobian will now we are concerned about some of the issues to explore, hope to bring you a harvest.
What is the composition of the black masterbatch
Composition of black masterbatch materials are: A. carbon black; B. carbon black carrier; C. carbon black wetting agent; D. carbon black dispersant; E. other processing aids.
Black masterbatch with carbon black
In accordance with international classification, China has more than 30 varieties. Mainly divided into rubber and non-rubber with two categories. Black Masterbatch In the rubber with carbon black is mainly wear-resistant carbon black, can effectively improve the wear resistance of rubber tires; in non-rubber carbon black, really can be used as black masterbatch carbon black only a few. The most widely used carbon black in the tank is mainly due to its rich source, high purity and small particle size. Among them, Black Masterbatch it is divided into high pigment carbon black (particle size 9-17mm), medium pigment carbon black (particle size 18-25mm) and low pigment carbon black (particle size 26-37mm). Due to different varieties of carbon black, the price difference is very large. Carbon black particles because of its own more active, rarely exist in the original particles, almost all of the range of particles in the presence of aggregated particles exist.
What is the carbon black carrier?
Carrier is the material carrying carbon black. What kind of raw materials are used in general plastic products, and what raw materials are used for the carrier? This made the black masterbatch and plastic raw materials compatibility is better. Such as: PS (polystyrene) plastic products, Black Masterbatch the use of black masterbatch carrier is PS. For polyethylene plastic products, the carrier is polyethylene. However, the general use of LDPE (high pressure polyethylene), because LDPE carrying carbon black the strongest, and processing performance. While other polyethylene HDPE and LLDPE can only produce low concentrations of black masterbatch. For PP (polypropylene) plastic products, only the use of PP and LDPE as the carrier of the black masterbatch, Black Masterbatch but can not use HDPE and LLDPE and other plastic as the carrier of black masterbatch. Of course, also useful to recover the material to do the carrier of the black masterbatch.
What are the dispersants used for carbon black masterbatches?
Organic dispersant and inorganic dispersant. High-grade black masterbatch using organic dispersant, mainly used for the use of environmentally friendly plastic products, Black Masterbatch such as drip irrigation products. Low-grade black masterbatch using inorganic dispersant, commonly used calcium carbonate. Can be judged from the masterbatch packaging, 25 kg only half of the bag is certainly the use of inorganic dispersant; full bag is the use of organic dispersant black masterbatch. The use of inorganic dispersants can greatly reduce the cost of black masterbatch, but very fatal is that calcium carbonate has accelerated the aging of plastic products.
Does black masterbatch also need processing auxiliaries?
Of course need. Smooth processing requires the correct selection of antioxidants, internal lubricants, external lubricants, modifiers and antistatic agents.
What are the processing methods for black masterbatch?
There are three types: single screw method, twin screw method and close love method.
Single screw method: the use of mixing machine to mix the material, by a single screw extruder pull granulation, the general carbon black concentration of 18-20%, backward technology, the production site of poor environmental conditions, is eliminated technology, Black Masterbatch do not rule out Some small factories still use this method to process.
Twin screw method: the use of mixing machine to mix the material, the twin-screw extruder pull or water ring granulation, due to the twin-screw machine itself is limited mixing capacity, masterbatch general carbon black concentration of 25-32%.
Mixing method: the use of mixing machine to mix the material, adding the mixer after kneading, and then fed by the feeder twin screw extruder, the water ring or underwater pelletizing, masterbatch general carbon black concentration in the 40- 45%.
What are the black masterbatch with outstanding performance?
In the plastic products dyeing, black masterbatch only 0.6% -0.8%, it will be extremely black, and then more will not be more black.
According to the test data show that the use of products in the Xinjiang region, such as the need to rely on black masterbatch anti-aging, as long as the use of high-quality black masterbatch (rather than back to do carrier, white oil wetting, calcium carbonate dispersion, etc.) , Carbon black products in the content of 2-2.5%, that is: every 100 kilograms of raw materials, 5-6 copies (weight) carbon black 40% of the masterbatch, the role played far more than any anti-aging products , Product life can reach more than 10 years. Black Masterbatch This is why drip products, water products, communications cable products are black. In addition, carbon black on the strength of the product increased, enhanced conductivity and other aspects have a special contribution.
The actual production did not use so many copies of the black masterbatch
That's right. The actual production of the general use of about 2 black masterbatch, and then add anti-aging additives, the use of anti-aging and carbon black synergistic anti-aging, to reduce product costs. In addition, the use of the length of time outdoors, product life requirements, but also decided to reduce the use of black masterbatch appropriate, provided that carbon black in the product must form a continuous phase, that is, carbon black "film" to protect the plastic. Such as: adding black masterbatch too little, Black Masterbatch carbon black phase (that is, the high concentration of small parts) in the product is not continuous, in the phase and phase boundaries, the most vulnerable plastic molecules, by UV direct blow to accelerate the aging reaction, At this time carbon black in the product as impurities, not as good as not. Phase and phase of the boundaries of less than 280mm, you can avoid UV light strike, the product is safe.
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