Application of polyethylene wax

Polyethylene wax (PEW) is a polyolefin synthetic wax, which generally refers to homopolyethylene with a relative molecular weight of less than 10,000. In a broad sense, ethylene polymers that have poor strength and toughness and cannot be processed as a single material can be called polyethylene wax. . Polyethylene wax has high softening point, low melt viscosity, good chemical stability, and good lubricity and fluidity. As a processing aid, it is widely used in PVC pipes, films, cables and other plastic and rubber products to improve product processing performance. And at the same time improve the appearance of the finished product.

Polyethylene wax has a wide range of applications in masterbatch dispersion, plastic processing lubrication, coatings, inks, cosmetics, textiles, special wax modification, etc.

1. Masterbatch

When plastics are colored, due to the difficulty in dispersing the toner in the resin matrix, a color masterbatch with high toner concentration is generally made as a colorant. Keep the product color stable. The dispersion process of pigments can be divided into three steps: wetting, crushing, and stabilization. Due to the high melt viscosity of resin and poor compatibility with pigments, it is difficult to wet the pigments, and it is also difficult to penetrate into the pores of the pigment aggregates to break them. Polyethylene wax is widely used as color masterbatch dispersant because of its high thermal stability, low melt viscosity and good compatibility with resin melt. Molten polyethylene wax has low viscosity, good compatibility with pigments, easy to wet pigments, and can penetrate into pigment agglomerates to weaken its cohesion, making it easier to break under the action of shearing force, and at the same time quickly wet and protect The new pigment particles [17] added polyethylene wax to the color masterbatch to reduce the melt viscosity, which is beneficial to the dispersion of the pigment, and at the same time improves the fluidity and production efficiency.

2. Plastic processing

Polyethylene wax is often used as a lubricant and mold release agent in plastic processing. Adding an appropriate amount of polyethylene wax can reduce the viscosity of plastic melt and improve its processing performance. Polyvinyl chloride (PVC) is a common general-purpose plastic. The degradation temperature of PVC is close to its viscous flow temperature, and various forms of degradation are prone to occur during processing. Adding an appropriate amount of polyethylene wax in PVC processing can lubricate both inside and outside. It can reduce the friction between chains, reduce the frictional heat generation of the melt, prolong the plasticization time, improve the thermal stability of PVC, reduce the release force between the melt and the metal, and improve the processing performance of high molecular weight polyethylene (UHMWPE). The melt viscosity is large and the processing is difficult. By blending with low molecular weight polyethylene wax, the rheological properties of UHMWPE can be improved. Both the large Young's modulus and the draw ratio are significantly improved, resulting in an improved balance between processing, solid state drawing, and mechanical properties of UHMWPE. The polarity of polyethylene wax can be changed by oxidation or grafting, and the polyethylene wax can also be broadened. It has good compatibility with PET, PBT, PC, PA6 or various composite materials, improves processing fluidity, reduces mold release force, reduces material wear on production equipment and molds, and increases production efficiency. , while making the product more beautiful.

3. Coating

Polyethylene wax is widely used in the coating industry as a wear-resistant agent. In the process of coating film formation, polyethylene wax migrates to the surface of the coating, reduces the friction coefficient of the coating, improves the smoothness, anti-blocking and water resistance of the coating, and plays the role of stain resistance, abrasion resistance and scratch resistance. . Moreover, polyethylene wax can also improve the rheological properties of coatings, make pigments and solid particles (such as aluminum powder in metallic glitter paint) dispersed evenly, and prevent pigment precipitation Different types of polyethylene waxes can play different matting effects in coatings Effects, from staying glossy to completely matting. For example, adding an appropriate amount of polyethylene wax to the acrylic polyurethane coating improves the gloss and smoothness of the coating surface, and enhances the scratch resistance of the coating film. Some varieties of polyethylene wax can also be used with matting agents. The surface of the coating film produces a matting effect, which can be used for decorative coatings.

4. Ink

Polyethylene wax can change the rheology of the ink, adjust its viscosity, speed up the fixation, improve the hydrophilicity and printing performance, and significantly enhance the friction resistance of the ink. Because of the polyamide type ink that is widely used at present, it can be used to print PE film benzene-free gravure ink. As a relatively environmentally friendly ink, it is widely used in plastic packaging, but the benzene-free gravure ink has poor scratch resistance, and there are mechanical problems during use. For problems such as scratches, the abrasion resistance of benzene-free gravure ink can be improved by adding a small amount of polyethylene wax, and the viscosity and surface tension of the ink are reduced without affecting the adhesion performance of the ink.

5. Textile

Under the action of a catalyst, polar groups such as hydroxyl and carboxyl groups are introduced into polyethylene wax by oxidation, which can enhance its hydrophilicity and emulsification. application prospects. Using the synergistic effect of oxidized polyethylene wax emulsion and polyurethane to finish knitted fabrics can give the knitted fabrics excellent anti-pilling properties. At the same time, the oxidized polyethylene wax can lubricate and reduce the friction coefficient, give the fabric a soft and smooth hand, and improve its Bursting strength. Oxidized polyethylene wax emulsion is used for leather finishing, which can enhance the lubricity and durability of leather. It is suitable for the compound emulsion of polyethylene wax and palm wax for soft leather finishing. It can form a coating film on the surface of cotton fabric and give cotton fabric a super-hydrophobic effect. , improve its stain resistance, and at the same time enhance the friction resistance and durability of the fabric, and have little effect on the breathability and thermal stability of the fabric.

6. Special wax modification

Paraffin wax is widely used in food, medicine and chemical industries. The output of paraffin wax in my country is the largest, but the hardness and strength of conventional paraffin wax cannot meet the needs of special purposes. Tissue sectioning requires section paraffin with high strength and low melting point. In order to meet the market demand, the development of special wax is more and more important. Polyethylene wax has high hardness and good mechanical properties, and can be used for the modification of special waxes. For example, adding polyethylene wax to paraffin wax can reduce the penetration and improve the hardness and strength of paraffin wax. When used together with lauric acid and stearic acid, it can adjust the melting point, hardness and viscosity of paraffin wax droplets, improve surface texture and gloss, and is suitable for special waxes. development and reconciliation play an important role.

7. Other applications

Polyethylene wax can be used in the investment casting process. Compared with the traditional paraffin-stearic acid mold material, polyethylene wax has high investment strength, good thermal stability, accurate casting size and smooth surface, and the wax mold is easy to recycle, which can realize Green production. Polyethylene wax is applied to the magnetic stripe of the magnetic card, which can improve its scratch resistance, wear resistance and high temperature anti-adhesion, greatly increase the life of the card, improve the appearance and ensure the good information storage and reading ability of the magnetic card. Polyethylene wax can effectively enhance the wear resistance of water-lubricated bearings. A small amount of polyethylene wax is added to the polyurethane-based water-lubricated bearing. After friction heating, the polyethylene wax is deposited on the surface of the composite material to form a protective film with good lubricity and improve Improve the lubrication conditions of the bearing, improve the wear resistance of the material, reduce the influence of the load, and prolong the service life of the bearing.

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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