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Characteristics and selection principles of polypropylene wax


Release time:

2022-04-25

Polypropylene wax is a chemical substance produced by cracking method, which is widely used in high-tech fields, such as paper coating toner, film condensation, etc., as well as pigment dispersants, lubricants, release agents for various synthetic resin molding, ink and coating modifiers, fabric treatment aids, etc.

Characteristics and selection principles of polypropylene wax

 polypropylene waxIt is a chemical substance produced by cracking method, which is widely used in high-tech fields, such as paper coating toner, film condensation, etc., as well as pigment dispersants, lubricants, release agents for various synthetic resin molding, ink and coating modifiers, fabric processing aids, etc.

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Practice has proved that low viscosity polypropylene wax has more advantages as a dispersing aid. They can quickly and effectively wet (coat) the pigment surface and the inside of the aggregate, thereby weakening the strong adhesion inside the aggregate. Therefore, the aggregates are easily dispersed with weak shear. Once the aggregates are dispersed, the wax will cover the free surfaces of the new pigment particles and stabilize the dispersion. According to the capillary effect, it is easy to understand that the polyethylene wax with low viscosity can reach the surface of the pigment primary particles where the high viscosity polymer is difficult to stay within a certain period of time, so polyethylene wax and polypropylene wax are the preferred pigment dispersion aids.

However, in the application of polypropylene spinning, the applicability of polypropylene wax is limited. For normal fine denier filaments and high quality fibers, polypropylene waxes are generally preferred over polyethylene waxes, especially for soft wool-like fine denier and BCF filaments suitable for flooring and textile apparel. Due to the incompatibility of polypropylene and polyethylene, it is difficult to form a uniform mixture in the microscopic sense, which will lead to phase separation. Secondly, since the melting point of polyethylene wax is significantly lower than that of polypropylene or polypropylene wax, it is difficult to handle the different melting characteristics of these two polymers. The inhomogeneity of the product and improper rheology may cause the spinning process to interrupt the head, and due to these side effects, the physical textile properties of the fiber deteriorate. At this time, polypropylene wax with low viscosity is used, because it has low viscosity and good wettability, and can wet the pigment in a short time.

 polypropylene waxThe compatibility with polypropylene resin in the micro and macro aspects is very good, and the mechanical properties are little affected. There are two kinds of polypropylene wax polymerized by metallocene catalysis technology: one is homopolypropylene wax, the raw material is propylene; the other is copolymerized polypropylene wax, with propylene and ethylene as raw materials. Generally, the melting point of polypropylene wax is high, between 140-160 degrees, the molecular weight is between thousands and tens of thousands, the corresponding viscosity is between tens and thousands, the crystallinity is high, and the hardness is high. The melting point of polypropylene wax is usually between 80 and 110 degrees, the viscosity is in the hundreds to thousands or even tens of thousands, and the corresponding molecular weight is in the thousands to tens of thousands. Due to the addition of ethylene comonomer to copolymer polypropylene, the regular arrangement of propylene molecules is disrupted, so the crystallinity of copolymer polypropylene is low, so the melting point is also low.

From the dispersion theory, in the pigment wetting stage, the low viscosity wax wetting occurs faster and the wetting efficiency is higher. However, in the extrusion granulation stage, we also hope that the wax has a certain viscosity, can transfer the shear force between the pigment and the resin melt, so that the wet pigment is evenly distributed in the resin melt. At this time, it can be considered to use a low melting point polypropylene wax in combination with a high viscosity polypropylene wax to achieve better dispersibility. By compounding a low-viscosity PP wax and a high-viscosity PP wax, the dispersibility of the toner can be significantly improved.


Key words:

Polypropylene wax