What should I do if PE wax is incompatible when used as a PVC lubricant?

PE wax has a very long non-polar carbon chain with a very strong polar center. In its structure, the part that is polarly compatible with the plastic plays the role of internal lubrication, and the part that is polarly incompatible with the plastic plays the role of external lubrication and demoulding.

An important application of PE wax is in PVC processing. In contrast to fatty acid lubricants, it does not adversely affect melt tension and Vicat softening points, and provides excellent anti-blocking and flow control. PE wax can be used to control melting in special processing methods.

Even in large quantities, it has good compatibility with other ingredients.

PE wax is the only known plastic lubricant that combines internal and external lubrication (release effect) while maintaining a high degree of transparency and having little to no effect on gelling. In addition, the low volatility of PE wax is extremely important for calendering and vacuum degassing.

As an internal lubricant, PE wax has good compatibility with polymers, and it plays a role in reducing the cohesion between polymer molecules inside the polymer, thereby improving the internal friction heat generation of the plastic melt and the fluidity of the melt.

The role of PE wax as an external lubricant is mainly to improve the friction between the polymer melt and the hot metal surface of the processing equipment. It is less compatible with polymers and easily migrates from the melt to the outside, so it can form a thin layer of lubrication at the interface between the plastic melt and the metal.

It is understood that some imported PE wax can solve the problem of compatibility with PVC, and has internal and external lubrication at the same time, this wax is similar to Mengdan wax but has a higher cost performance. Such as the PE wax of Euroceras in Europe, this PE wax has a very strong polar center of a long non-polar carbon chain. When used as a PVC lubricant, the part of its structure that is compatible with the plastic in polarity plays the role of internal lubrication, and the part that is incompatible with the plastic in polarity plays the role of external lubrication and demoulding.

You can try it out.

What kind of wax do you use? Don't sacrifice quality for the sake of cost, you can't get it, use imported ones.

Montan wax is too expensive, and it is good to use ope wax.

The role of PVC lubricants is to reduce the friction between the polymer and the device, as well as the internal friction between the polymer molecular chains. The former is called external lubrication, and the latter is called internal lubrication. It has external lubrication such as silicone oil, paraffin, etc., and has internal lubrication such as monoglycerides, stearyl alcohol and esters.

As for metal soaps, it's a bit of both. In addition, it should be noted that the statement of internal and external lubrication is only a habitual name for us, and there is no obvious boundary, some lubricants play different roles in different conditions, such as stearic acid, at low temperature or a small amount, it can play an internal lubricating role, but when the temperature rises or the amount increases, its external lubrication effect gradually prevails, and there is a special case of calcium stearate, which is used alone as an external lubricant, but when it is used in conjunction with hard lead and paraffin, it becomes an internal lubricant to promote plasticization.

In rigid PVC plastics, excess lubricant can lead to a decrease in strength and also affect process operations. Peeling can occur in the case of injectable products, especially in the vicinity of the gate. For injection products, the total dosage of stearic acid and paraffin is generally in parts

Extruded products generally do not exceed 1 part.

In soft product formulations, too much lubricant can cause frosting and affect the strength of the product and the high-frequency welding and printability. Too little lubricant will stick to the roller, and for blown film, too little lubricant will stick to the mold, which is easy to make the plastic coke in the mold. At the same time, in order to improve the stickiness of the blown film, it is advisable to add a small amount of monoglycerides, an internal lubricant.

In the production of PVC soft products, the amount of lubricant added is generally less than 1 part.

PE wax is used as an external slip agent, which is a non-polar or low-polar organic compound, with a melting point of 90-110, a long hydrocarbon chain, and poor compatibility with PVC. The external slip precipitates to the surface of the melt under the action of a certain temperature and pressure, and the melt forms a boundary film on the metal surface.

External lubrication!

The additives used in PVC processing make the materials and machine steel in the processing process have a certain lubricity. Abbreviated as external lubricant. Low molecular weight polyethylene. The number of servings cannot be increased. It will precipitate, resulting in a sharp decrease in the thermal stability of PVC.

It is mainly an outward slip effect, but also an internal slip effect.

Oxidized polyethylene wax has certain functional groups on the molecular chain, so its compatibility with polar resins is significantly improved, which is better than that of polyethylene wax. (1) Chemical composition: low molecular weight oxidized polyethylene containing hydroxyl and carboxyl groups (2) Properties:

White with slightly yellow powder, with good chemical stability, soluble in aromatic hydrocarbons. (3) Uses: It is widely used in water-based coatings and ink formulations to provide excellent abrasion resistance, anti-adhesion and scratch resistance.

In the plastics processing industry, the internal and external lubrication effects of PVC are relatively balanced; Adding oxidized polyethylene wax to hard, transparent, opaque PVC formulations has better lubricity than other lubricants. It is widely used in the production of PE and PVC cables, PVC profiles and pipes, and is an excellent new plastic processing lubricant. It can also be used as raw and auxiliary materials for the production of textile softener, car wax and leather softener.

Oxidized polyethylene wax is functionally a PVC lubricant and does not belong to engineering plastics.

PE wax is one of the more common external lubricants in PVC profiles. When the amount of PE wax is too small, the surface brightness is poor; When the amount of PE wax is too large, because the lubricant is added too much, a layer of separator film is formed, and there will be slippage between the mixed material and the equipment, and the material can not get the shear stress due to plasticization, and it can not be plasticized well, and the mechanical properties are reduced, and the surface gloss is not satisfactory. Therefore, a reasonable amount of lubricant is the key to ensure the performance of the profile and the brightness of the surface.

Fischer-Tropsch waxes and polyethylene waxes play a lubricating role in PVC.

Also as a PVC lubricant, Fischer-Tropsch synthetic waxes are often compared to generic polyethylene waxes (PE waxes), with the following significant differences:

1. Molecular weight. The molecular weight of Fischer-Tropsch wax is much lower than that of PE wax, and the branched chain is also less, the crystallinity is high, and it is easy to penetrate into the high-viscosity macromolecular chain, which significantly reduces the melt viscosity, has little mobility during processing, and has obvious lubrication effect in the later stage.

2. Fischer-Tropsch wax is saturated direct-linked alkane, does not contain double bonds, has strong antioxidant ability, and has good weather resistance.

3. The viscosity of Fischer-Tropsch wax is much lower than that of PE wax. Only about 10. The same lubrication effect can be achieved with a smaller amount.

Fischer-Tropsch wax is compatible with PVC and can be used as both internal and external lubricants. It can be used as a good internal lubricant to effectively control shear conditions, promote flow, control friction and melt properties, and thus improve thermal stability. At the same time, Fischer-Tropsch wax achieves the best physical and processing properties for PVC products due to its high crystallinity and high linearity structure.

Depending on the need, the Fischer-Tropsch process can synthesize alkanes of different chain lengths to change the molecular weight of the final product to form a series product.

The main characteristics of polypropylene wax: it has a higher melting point than polyethylene wax, good lubrication and dispersion effect, improves the gloss of products, and has a small melt viscosity, which is a kind of polyolefin processing aid that replaces imports.

Scope of application: It is used for steaming bag bonding to replace the controversial polyurethane type adhesive.

It can replace polyethylene wax for high-temperature spinning masterbatch manufacturing, overcome the shortcomings of polyethylene wax when spinning at high temperature, such as easy sublimation and peculiar smell, and is especially suitable for dispersion lubricants manufactured by polypropylene and tapering spinning masterbatches.

In the processing of LLDPE and HDPE export products, the use of an appropriate amount of polypropylene wax can reduce the current of the active machine by 10-20%, increase the extrusion amount and shorten the time, especially in the LLDPE blow molding process, which can greatly improve the appearance quality and transparency of the thin house, and basically eliminate the phenomenon of shark skin.

Adding an appropriate amount of the product in inks and coatings, especially plastic color inks, can improve the sharpness and abrasiveness of the ink, improve the temperature resistance, improve the transparency, and can replace the polymer polyamide resin.

Hope it helps, thank you.

It is all external lubrication, and the effect is strong and weak.

External lubrication, release agent.

PE wax is externally lubricated and demolded.

Stearic acid is used as an internal lubricating agent in rigid profiles and is coated with calcium carbonate.