The filled polyolefin masterbatch selection of raw and auxiliary materials

Filled polyolefin masterbatch is by the carrier resin, filler, and various additives of three parts, including packing for main ingredients, up to 90%. Filled polyolefin masterbatch is mainly used in polyethylene, polypropylene and other polyolefin plastic production. Such as: PE hollow blow molding products, polyethylene plastic injection products and PE film, polypropylene woven bags, woven cloth, packing tape, etc. General selection of olefins filler masterbatch raw and auxiliary materials, want to consider the use of good performance and low cost. （ 1) Packing is mainly used in the packing filled polyolefin masterbatch heavy calcium carbonate, the second is the talcum powder, kaolin, silicon ash powder and other inorganic filler. For any inorganic filler, particle size and size distribution is an important technical index. The narrower the usually the smaller the particle size, narrow distribution, filling the better the results. In addition, the filling effect is good or bad also related to dispersion, the smaller the particle size of disperse the harder, the higher the price also. Purity is another important technical indicators of inorganic filler, the less impurity content, purity, the higher the better. Selection of general heavy calcium carbonate, its content as much as possible, general requirements above 94%. Guarantee other indicators meet the requirements, lower prices, to help reduce the cost of masterbatch. （ 2) The use of carrier resin filled polyolefin masterbatch performance and cost mainly depends on the carrier resin, usually depending on the purpose of the masterbatch, carrier resin content is 10% ~ 20% in general. Filled polyolefin masterbatch carrier resin should be used with the filling of plastic resin with good compatibility. From this aspect, the general carrier resin had better choose the matrix resin. In addition, when choosing filled mesh material carrier, but also consider its melting point and melt fluidity, the carrier shall not be higher than melting point of the resin matrix resin. At present, there are still some enterprises are still in use LDPE ( 1 f7b) As the carrier resin, this is mainly because this type of resin of low melting point, high melt flow rate ( 7g/10min） 。 But because of polypropylene melt temperature is high ( Is higher than general polyethylene 20 ~ 40 ℃) Limits its use in polyethylene plastic and atactic polypropylene or with liquid phase synthesis of ontology of powdered polypropylene melting point does not exceed 100 ℃, so is widely used as the carrier of polyolefin filler masterbatch. With the LDPE ( 1 f7b) Carrier for polyolefin filler matrix resin, its biggest advantage is low melting point, high melt flow rate, the melt strength, but the prominent disadvantage is that the high price. If choose low cost low melt flow rate of low density polyethylene resin, such as 1 i2a 1 or 2 f2b etc, because of their low melt flow rate, generally about 2 g / 10 min, when processing, need to add more paraffin wax additives, such as to facilitate the masterbatch better dispersion polymer matrix. Usually made of polyethylene as carrier filler masterbatch, more suitable for PE plastic products, the main reason is that carrier resin is the same as the matrix resin performance, good compatibility. Used in polyethylene film filler masterbatch higher more strict to the requirement of carrier resin. Used for filler masterbatch of polypropylene products, its carrier resin had better choose polypropylene. Theoretically, atactic polypropylene is best, because of its low melting point, good melt flow, good dispersion. But specific to China's national conditions, choose liquid phase synthesis of ontology powder polypropylene more appropriate, because it is cheap, itself is powder, uniform is easily mixed with inorganic filler, even won't stratification in the feed hopper. Adopts polypropylene as the carrier, due to the poor thermal stability of polypropylene, must at the same time adding antioxidants and lubricant. In order to make the amount of resin per thousand several additives can be evenly distributed in the resin, it's best to uniform resin is mixed with various additives, proportional to the mixed with packing granules. Recycled polystyrene is widely used in synthetic leather manufacturing process, even if the carrier resin compatibility with matrix resin is not good enough, but the use as carrier resin for plastics performance impact is far smaller than the effect of filler, can bring considerable economic benefits. In with other resins as carrier and the filler masterbatch production, in order to improve the liquidity and filler masterbatch on the dispersion of the matrix resin, often to join a small amount of recycled polystyrene. Because of filler masterbatch production costs mainly depends on the carrier resin, and because of the carrier resin in the masterbatch content is less, the general filling modification of little effects on the performance of the plastic products, in order to reduce the cost of masterbatch, often choose waste polyethylene, polypropylene plastic or polyethylene polypropylene composite membrane leftover material as a carrier. （ 3) Fertilizer filled polyolefin masterbatch used fertilizer varieties mainly dispersants and surface treatment agent. Dispersant is to improve the effect of masterbatch processing of liquidity, is conducive to concentrate more evenly dispersed in the matrix resin. Commonly used dispersant are: white oil ( Liquid paraffin) , paraffin wax, phthalic acid dioctyl ester ( 防喷器) And low molecular weight polyethylene ( Polyethylene wax) And stearic acid, etc. Performance of dispersant, can choose according to the packing and the performance characteristics of the carrier resin is used. Surface treatment agent can change the surface activity, inorganic filler, the hydrophilicity of into hydrophilic benefit and carrier resin, mainly include two categories, coupling agent and stearic acid.