1. What material is the black masterbatch composed of?
Materials composed of black masterbatch are: A. carbon black; B. Carbon black carrier; C. Carbon black wetting agent; D. Carbon black dispersant; E. Other processing AIDS.
2, please introduce the black masterbatch with carbon black.
According to the international classification, China has more than 30 varieties. It is mainly divided into two categories: rubber and non-rubber. In rubber carbon black is mainly wear-resistant carbon black, which can effectively improve the wear resistance of rubber tires; In non-rubber carbon black, there are only a few types of carbon black that can really be used as a black masterbatch. Carbon black is the most widely used in plastics, mainly due to its rich source, high purity and small particle size.
3, what is the carbon black carrier?
The carrier is the material that carries the carbon black. What raw materials are used in general plastic products, and what raw materials are used in carriers. The black masterbatch produced in this way has good compatibility with plastic raw materials. For example: PS(polystyrene) plastic products, the black masterbatch carrier used is PS.
For polyethylene plastic products, the carrier is polyethylene. However, LDPE(high pressure polyethylene) is generally used, because LDPE has the strongest carbon black bearing capacity and good processing performance. Other polyethylene HDPE and LLDPE can only produce low concentration black masterbatches. For PP(polypropylene) plastic products, only black masterbatches of PP and LDPE as carriers can be used, but black masterbatches of HDPE and LLDPE and other plastics as carriers cannot be used. Of course, there are also black masterbatches with recycled materials as carriers.
4. Why does carbon black need wetting agents?
The specific gravity of carbon black is about 2g/cm, and because the particle size of carbon black is very small, the performance density is very small, and it seems to be fluffy and light. To process smoothly, it is necessary to wet the carbon black first. The choice of wetting agent is very important. In order to reduce costs, a large number of enterprises use products such as white oil or paraffin, which will seriously affect the strength of processed products.
5. What are the dispersants used in carbon black masterbatch?
It is divided into organic dispersant and inorganic dispersant. High-grade black masterbatch uses organic dispersants, mainly used for plastic products with high environmental requirements. Low grade black masterbatch uses inorganic dispersant, usually calcium carbonate. It can be judged from the masterbatch packaging that only half a bag of 25 kg must be the use of inorganic dispersant; A bag full of black masterbatches with an organic dispersant. The use of inorganic dispersants can greatly reduce the cost of black masterbatches, but it is deadly that calcium carbonate has the effect of accelerating the aging of plastic products.
6, black masterbatch also need processing AIDS?
Of course we do. Smooth processing requires the correct selection of antioxidants, internal lubricants, external lubricants, modifiers and antistatic agents.
7, What are the processing methods of black masterbatch?
There are three: the single screw method, the twin screw method and the mixing method. Single screw method: The use of mixing machine to mix the material, by the single screw extruder pull granulation, the general carbon black concentration in 18-20%, the process is backward, the production site environmental conditions are poor, is eliminated process, does not rule out some just started small factories still use this method for processing.
Twin-screw method: The use of mixing machine to mix the material, by the twin-screw extruder strip or water ring granulating, due to the limited mixing capacity of the twin-screw machine itself, the master batch is generally 25-32% carbon black concentration. Mixing method: The mixing machine is used to mix the material, add it to the mixing machine after kneading, and then feed it into the twin-screw extruder by the feeder, cut the grain through the water ring or underwater, the master material is generally 40-45% carbon black concentration.
8. Does the processing method affect the masterbatch performance?
Yes. Obviously, the mixing method improves the carrying capacity of the carrier for carbon black, and the carbon black can enter the carrier more evenly. The agglomeration size of carbon black particles is greatly reduced by taking advantage of mechanical kneading of mixer, and the particle size and distribution of carbon black in masterbatch are uniform, which can not be replaced by other two methods.
9. In what aspects does the black masterbatch have outstanding performance?
In the dyeing of plastic products, the black masterbatch only needs 0.6%-0.8%, it will be very black, and then it will not be more black.
According to the test data, the outdoor use of products in Xinjiang region, such as the need to rely on black masterbatch anti-aging, as long as the use of high-quality black masterbatch (instead of the carrier, white oil wetting, calcium carbonate dispersion, etc.), the content of carbon black in the product reached 2-2.5%, that is: In every 100 kilograms of raw materials, there are 5-6 (weight) masterbatches containing 40% carbon black, which play a far greater role than any anti-aging products, and the product life can reach more than 10 years. That's why drip irrigation products, water delivery products, communication cable products are all black. In addition, carbon black has special contributions to the strength of products and the enhancement of electrical conductivity.
10, the actual production does not seem to use so many copies of the black masterbatch?
Right. In actual production, about 2 black masterbatches are generally used, and then anti-aging additives are added, and the synergistic effect of anti-aging and carbon black is used to prevent aging to reduce product costs. In addition, the length of outdoor use time, product life requirements, but also determine the use of black masterbatch appropriate reduction, the premise is that carbon black in the product must form a continuous phase, that is, a carbon black "film" to protect the plastic.
If the black masterbatch is added too little, the carbon black phase (that is, the part with a high concentration of small pieces) is not continuous in the product, at the boundary between the phase and the phase, the plastic molecule is the most vulnerable, is directly hit by ultraviolet light, accelerates the oxygen aging reaction, at this time, the carbon black in the product as an impurity, it is better not to add.