The difference and application of “stearic acid, PE wax and paraffin wax” in PVC products

Stearic acid

Stearic acid, namely octadecanoic acid, is produced by the hydrolysis of oil and is mainly used to produce stearate. The melting point is 69.6°C, and it is a main component of animal and vegetable oils.
Appearance: The pure product is a white waxy crystal with slight luster.
Melting point: 71.5-72℃69.6℃
Boiling point: 232°C (2.0kPa)
Flash point: 220.6°C
Spontaneous ignition point: 444.3°C
Stability: 360°C decomposition (other information says 376.1°C )
Toxicity: Non-toxic
Dissolution: Insoluble in water (at 20°C, only 0.00029g is dissolved in 100ml of water). Slightly soluble in cold ethanol. Soluble in acetone, benzene, ether, chloroform, carbon tetrachloride, sulfur dioxide, chloroform, hot ethanol, toluene, amyl acetate, etc.
Others: Slowly volatilize at 90-100°C. It has the chemical generality of general organic carboxylic acids.
Stearic acid is widely used in the manufacture of PVC plastic pipes, plates, profiles and films. It is a PVC heat stabilizer with good lubricity and good light and heat stabilization. In plastic PVC pipes, stearic acid helps to prevent “scorch” during processing. It is an effective heat stabilizer added in PVC film processing, and can prevent the finished film from being exposed to sulfide. Discoloration.

PE wax

PE wax is polyethylene wax (PE-WAX), an ultra-low molecular weight polyethylene.
Polyethylene wax is generally divided into four types: oligomer wax, cracking wax, polymer wax and blending wax. The domestic production is generally oligomer wax Waxes, other cracking waxes, polymeric waxes and blending waxes are mainly produced abroad. The theoretical analysis of the performance of polymeric waxes is better than cracking waxes. The specific use depends on the compatibility of the products. Generally, it is mainly used to improve the fluidity of polyolefin plastics, improve the dispersion of fillers and additives, and is also used as an internal lubricant for rubber and plastic materials.
Main features:
Low viscosity, softening High point, good hardness and other properties, non-toxic, good thermal stability, low volatility at high temperature, dispersibility to pigments, excellent external lubricity, and strong internal lubricity, which can improve the efficiency of plastic processing Production efficiency, good moisture resistance at room temperature, strong chemical resistance, excellent electrical properties, and can improve the appearance of finished products.

Scope of application:
Because of its very Excellent external lubrication and strong internal lubrication, good compatibility with polyethylene, polyvinyl chloride, polypropylene and other resins, can be used as a lubricant in extrusion, calendering, and injection processing. It can improve processing efficiency, prevent and overcome the bonding of films, pipes, and sheets, improve the smoothness and gloss of finished products, and improve the appearance of finished products.
As a thick color masterbatch dispersant for a variety of thermoplastic resins and a lubricating dispersant for filling masterbatches and degradation masterbatches, it can improve HDPE, Processability, surface gloss, lubricity and thermal stability of PP and PVC.
Used as a lubricant for cable insulation materials, it can enhance the diffusion of fillers, increase the extrusion molding rate, increase the flow rate of the mold, and release the mold convenient.
Good light resistance and chemical properties, can be used as a carrier of pigments, can improve the abrasion resistance of paints and inks, and improve the dispersion of pigments and fillers , prevent the pigment from sinking to the bottom, and can be used as a flatting agent for paints and inks.
It can be added to various paraffins to improve its performance. Excellent electrical insulator properties, added to insulating oil, paraffin or microcrystalline paraffin to increase its softening temperature, viscosity and insulation performance. It can be used for cable insulation, moisture-proof coating for capacitors and transformer windings.
It can be widely used in the manufacture of color masterbatch, granulation, plastic steel, PVC pipe, hot melt adhesive, rubber, shoe polish, leather brightener, Cable insulation materials, floor wax, plastic profiles, ink, injection molding and other products.

paraffin

Paraffin wax is a kind of strange wax extracted from petroleum, shale oil or other asphalt mineral oil, which is white or light yellow Translucent, with a fairly obvious crystalline structure.

English name: paraffinwax

Paraffin wax is a kind of mineral wax and a kind of petroleum wax; it is a lubricating oil fraction obtained from crude oil distillation through solvent refining, solvent dewaxing or The flaky or needle-shaped crystals obtained by freezing and crystallizing wax, dewaxing by pressing to obtain wax paste, and then deoiling with solvents and refining, are also called crystalline wax. The main quality indicators are melting point and oil content, the former means temperature resistance, and the latter means purity.

Mainly used as components and packaging materials for food and other commodities (such as wax paper, crayons, candles, carbon paper), coating materials for baking containers, raw materials for cosmetics, It is used for fruit preservation, improving rubber aging resistance and flexibility, electrical component insulation, precision casting, etc. It can also be used for oxidation to generate synthetic fatty acids.
Classification and use

Liquid paraffin, commonly known as white oil, is a colorless and transparent liquid, which can be used as a transparent internal lubricant for PVC, and the dosage is about 0.5 parts.

Solid paraffin, also known as natural paraffin, is a white solid and can be used as an external lubricant for PVC.

Microcrystalline paraffin, also known as high melting point paraffin, has a white or light yellow solid appearance and is called microcrystalline paraffin because of its fine crystals. Lubricating effect and thermal stability are better than other paraffins. The amount used in PVC is small, generally 0.1~0.2 parts.

Chlorinated paraffin, good compatibility with PVC, poor transparency, good effect when used with other lubricants. It is advisable to use less than 0.3.