Production method of polyethylene wax

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

1. Ethylene polymerization method

There are three main methods for producing polyethylene wax by ethylene polymerization. One is polymerization under high temperature and high pressure with free radical catalyst; the second is polymerization under low pressure with Ziegler catalyst; the third is polymerization with metallocene catalyst.

2. Polyethylene cracking method

The molecular weight distribution of the polyethylene wax produced by the polymerization method is narrow, and the relative molecular weight can be controlled artificially, but it is carried out on a large device, and the capital investment is large. Domestic manufacturers generally use the thermal cracking method of high molecular weight polyethylene to produce. The raw material used in this method can be polyethylene resin or polyethylene waste plastic. The former has high product grade, while the latter has low product grade . High molecular weight polyethylene can be thermally cracked into low molecular weight polyethylene wax in the absence of air, and the structure-related properties (such as crystallinity, density, hardness and melting point) of the polyethylene wax prepared in this way are affected by the cracking raw materials. The cracking processing method is divided into cracking kettle method and extrusion method. The cracking kettle method is a batch processing method, which is suitable for manufacturers with low production volume and small production capacity; the extrusion method is a continuous production method, which is suitable for enterprises with large production volume and high production capacity.

Polyethylene wax can be prepared by recycling polyethylene lysate. The raw material source of this technology is very rich and cheap, the process is relatively simple, and the operation cost is low.

3. Purification of polyethylene by-products

Polyethylene wax products can be recovered from the mixture of low molecular weight components and solvents obtained by the polymerization of ethylene to produce polyethylene. After the solvent and initiator are removed from the by-product 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. This by-product polyethylene wax product usually contains molecules with a relative molecular mass of about 1000, so its physical properties such as mechanical strength and heat resistance are lower than those of polyethylene wax products produced by ethylene polymerization.

4. Modification of polyethylene wax

Polyethylene wax is a non-polar molecule. If polar groups can be added to the molecule, the application field will be greatly expanded. These functionalized polyethylene waxes can be produced by copolymerization of ethylene and oxygen-containing monomers, or by chemical methods such as oxidation and grafting of polyethylene wax to introduce carboxyl groups, and then further through chemical reactions such as esterification, amidation, and saponification. Modified, these functionalized polyethylene waxes can meet the requirements of different applications.

Jiangmen Shengpeng Chemical Industry Co., Ltd. specializes in the production of various chemical raw materials: coating matting agent, thixotropic thickener, special silica for glass glue, special silica for mixing rubber, DMC, dimethyl silicone oil, 107 room temperature vulcanization Silicone rubber, hydroxy silicone oil, hydrogen-containing silicone oil, vinyl silicone oil, methyl capping agent, zinc stearate, calcium stearate, magnesium stearate and other products, all product indicators meet or exceed national standards. The products are widely used in PU, NC, PE paint and other wood coatings, automotive coatings, marine coatings, powder coatings, textiles, cosmetics, rubber products and other fields. The product quality is guaranteed, and the SGS test results meet the EU ROHS directive standard. We sincerely hope to achieve more extensive cooperation with domestic and foreign customers, and we are willing to work together with you to create a better future!

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