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The raw and auxiliary materials of plastic packed Masterbatch

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The raw and auxiliary materials of plastic packed Masterbatch

Date:2018-03-08 Author: Click:

Polyolefin filling material is composed of three parts, carrier resin, filler and various auxiliaries, in which the filler is the main component, up to 90%. Polyolefin filled masterbatch is mainly used in polyolefin plastics such as polyethylene, polypropylene and other polyolefin plastics. Such as polyethylene hollow blow molding products, polyethylene injection products and polyethylene film, polypropylene woven bags, woven fabric and packaging belt. When the raw and auxiliary materials filled with olefin fill materials are generally chosen, it is necessary to take into account their good performance and low cost.

filler

The main filler used in polyolefin filled masterbatch is heavy calcium carbonate, followed by inorganic filler such as talcum powder, kaolin, wollastonite powder and so on. It is an important technical index for any inorganic filler, particle size and particle size distribution. The smaller the particle size is, the narrower the distribution is, the better the filling effect is. In addition, the filling effect is also related to the dispersion, the smaller the particle size is, the more difficult the dispersion is, the higher the price is. Purity is another important technical index of inorganic filler, the less the impurity content, the better the purity. When the heavy calcium carbonate is generally chosen, its content and whiteness are as high as possible, and the general requirement is above 94%. In order to reduce the cost of the masterbatch, the price should be low after the other indexes are guaranteed.

Carrier resin

The performance and cost of polyolefin filled masterbatch mainly depend on the carrier resin, and the general content of the carrier resin is 10%~20% according to the different uses of the masterbatch. The carrier resin used for the polyolefin filled matrix should have good compatibility with the filled plastic matrix resin. In this regard, the general carrier resin is the best choice of matrix resin. In addition, the melting point and melt fluidity of the filled matrix should also be considered, and the melting point of the carrier resin must not be higher than the matrix resin. At present, some enterprises still use LDPE (1F7B) as the carrier resin, which is mainly due to the low melting point and high melt flow rate (7g/10min) of this brand. But due to high melting temperature of polypropylene (than ordinary polyethylene high 20~40 C) limits its use in polyethylene plastic, and atactic polypropylene or polypropylene powder synthesized by liquid phase bulk melting point does not exceed 100 degrees, so it is widely used as a carrier for polyolefin filling masterbatch.

Using LDPE (1F7B) as carrier material for polyolefin filling, its biggest advantages are low melting point, high melt flow rate and strong melt strength, but the outstanding drawback is high price. If the choice of low density polyethylene melt flow rate and low cost low, such as 1I2A-1 or 2F2B, because of their low melt flow rate, generally about 2g/10min, in the process, need to add more wax and additives, in order to better dispersed in the matrix resin masterbatch. Generally, the filling master batch made of polyethylene is more suitable for polyethylene plastic products. The main reason is that the performance of the carrier resin and the matrix resin is the same, and the compatibility is good. The filling masterbatch used in polyethylene film is more demanding for the carrier resin.

The plastic filling material used in polypropylene products, its carrier resin is the best choice of polypropylene. In theory, random polypropylene is the best because of its low melting point, good melt fluidity and good dispersibility.  However, it is more suitable for our country to choose powdered polypropylene synthesized by liquid-phase bulk polymerization, because its price is low, itself is powdery, and it is easy to mix evenly with inorganic fillers. Even in the hopper, it will not be layered. As the polypropylene is used as the carrier, the antioxidant and lubricant must be added at the same time because of the poor thermal stability of the polypropylene. In order to make the assistant that only a thousandth of the total resin can be evenly distributed in the resin, it is best to mix the resin with various auxiliaries first, and then mix it with the filler in a certain proportion.

In order to use universality, polypropylene and polyethylene with similar melt index can be used as carrier resin in a certain proportion, so that the combination of master batch and polyethylene can improve some properties, and polypropylene can improve the elongation.

Recycled polystyrene is widely used in synthetic leather manufacturing process. Even if the compatibility between carrier resin and matrix resin is not good enough, the influence of carrier resin on the properties of plastic products is far less than that of fillers, which can bring considerable economic benefits. When using other resins as carriers to make filling master batch, a small amount of recycled polystyrene is often added to improve the processing fluidity and the dispersion in the matrix resin.

Due to the cost of production of filling masterbatch mainly depends on the carrier resin, with less content of carrier resin in Masterbatch, plastic products generally filled with modified performance impact, in order to reduce the cost of scrap often used masterbatch, plastic waste polyethylene and polypropylene or polyethylene polypropylene film as a carrier.

Auxiliary

The main auxiliaries used in polyolefin filled masterbatch are dispersant and surface treatment agent. The effect of dispersant is to improve the processing fluidity of the masterbatch, which is beneficial to the more uniform dispersion of the masterbatch in the matrix resin. The commonly used dispersants are: white oil (Liquid Paraffin), paraffin, two formic acid and two octyl phthalate (BOP), low molecular weight polyethylene (PE wax and stearic acid). The main properties of the commonly used dispersants can be used according to the performance characteristics of the filler and the carrier resin. Surface treatment agent can change the surface activity of inorganic filler and transform it from hydrophilic to lipophilic, which is beneficial for mixing with carrier resin. There are mainly two kinds of coupling agents and stearic acid. In order to disperse products better and brighter, they can add EBS, flow modifier and so on.


Plastic filled masterbatch

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