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What are the production methods of polyethylene wax?

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Polyethylene wax is an intermediate polymer of ethylene, which is neither the hard block of polyethylene nor the gaseous state of ethylene, but the waxy state. Hepai Chemical pointed out that it is widely used and has quite successful application cases in many industries.

What are the production methods of polyethylene wax?

 polyethylene waxIt is an intermediate polymer of ethylene, neither the hard block of polyethylene nor the gaseous state of ethylene, but the wax state. Hepai Chemical pointed out that it is widely used and has quite successful application cases in many industries.


The main features of polyethylene wax are: good hardness, high softening point, low viscosity, non-toxic, good thermal stability, low volatility at high temperature, strong internal lubrication and good external lubrication for pigment dispersion, which can improve the production efficiency of plastic processing, good moisture resistance at room temperature, strong chemical resistance, excellent electrical performance, and can improve the appearance of the finished product.

At present, there are three main methods for the production of polyethylene wax: one is polyethylene wax synthesized by ethylene monomer oligomerization, such as free radical oligomerization; the second is polyethylene wax prepared by polymer degradation; the third is the by-products in the process of polyethylene synthesis, such as polyethylene wax obtained by separation of by-products in high-pressure polyethylene synthesis.

1. Ethylene polymerization. The method of producing polyethylene wax by ethylene polymerization: polymerization with free radical catalyst at high temperature and high pressure; polymerization with Ziegler catalyst at low pressure; polymerization with metal catalyst.

2, polyethylene cracking method. Polymerization production of polyethylene wax molecular weight distribution is narrow, the relative molecular mass can be artificially controlled, but must be in large capital investment in large-scale equipment. Domestic manufacturers generally use the thermal cracking method of high molecular weight polyethylene, which can be used as a raw material for polyethylene resin or polyethylene waste plastics. The former produces high-grade products, while the latter produces low-grade products. High molecular weight polyethylene can be thermally cracked into low molecular weight polyethylene wax under the condition of isolation from air, and the structure-related properties of the polyethylene wax thus prepared are affected by the cracking raw material. The cracking processing method is divided into the cracking kettle method and the extrusion method: the cracking kettle method is an intermittent processing method, which is suitable for manufacturers with small production capacity and low output. Extrusion is a continuous production method, which is suitable for enterprises with high capacity and large output. Polyethylene wax can be prepared by recycling polyethylene pyrolysis liquid, which has simple process, abundant and cheap raw materials and low operating cost.

3. Purification of polyethylene by-products.polyethylene waxThe product may be recovered from a mixture of low molecular weight components and solvent which is obtained as a by-product in the polymerization of ethylene to produce polyethylene. After removing the solvent and initiator from the by-products of the polyethylene plant, the molecular weight distribution of the product is still very wide, which limits its application field and needs to be further purified by solvent separation. Such a by-product polyethylene wax generally contains molecules having a relative molecular weight of about 1000, and therefore has lower physical properties such as mechanical strength and heat resistance than polyethylene wax products produced by ethylene polymerization.

  polyethylene waxAn important application in PVC processing, compared with fatty acid lubricants, it has no adverse effect on melt tension and Vicat softening temperature, and provides excellent anti-clogging and flow control effects. Polyethylene wax can be used to control melting in special processing methods, and even if the addition amount is large, it can be well compatible with other ingredients.

Key words:

Polyethylene wax