UCWAX 108A is polyethylene wax. It can delay plastication, control surface precipitation, and improve demoulding performance during the processing of PVC products. It can improve the fluidity and lubricity of plastics, as well as the dispersibility of pigments and fillers. It can achieve moderate external lubricity and improve glossiness.
Its main characteristics are as follows:
• Improve the glossiness of the surface of rigid PVC • Delay plastication of PVC products
• Improve the dispersion of plastic fillers and pigments • Improve demoulding performance
Typical applications: masterbatches, suitable for rigid PVC products, such as profiles, pipes, pipe fittings, louvers, wood - plastic composites, pellets, etc.
Supplementary on Molecular Structure and Performance
Details of Molecular Structure
In the polyethylene wax structure of UCWAX 108A, besides the moderate molecular weight being helpful for its function in the PVC system, the degree of branching of its molecular chains may also affect its performance. Although the overall structure is relatively linear, there may be a small number of short branches. These short branches can increase the intermolecular spacing to a certain extent, making it have better dispersibility in PVC and avoiding the influence on the interaction with PVC molecular chains due to overly close molecular packing.
Supplementary on Crystallization Behavior
In terms of crystallization, besides the high crystallinity being able to achieve moderate external lubricity and improve glossiness, the growth mode of its crystallization is also important. UCWAX 108A may have a relatively uniform crystallization growth pattern, which helps to form a continuous and uniform crystalline layer on the surface of PVC products, thereby more effectively improving glossiness and achieving stable external lubrication effects.
II. Supplementary on the Role in PVC Processing
Supplementary on Delaying Plastication
During the process of delaying plastication, the interaction points between UCWAX 108A and PVC molecular chains may be somewhat selective. It may be more likely to adsorb on certain active sites of PVC molecular chains, such as the ends of branches or segments with poor local regularity, thus precisely hindering the rapid and orderly arrangement of molecular chains in these parts and achieving more precise regulation of the plastication process.
Supplementary on Surface Precipitation Control
From a microscopic perspective, the molecular diffusion behavior of UCWAX 108A in the PVC system plays a key role in surface precipitation control. Its diffusion coefficient in PVC is within a suitable range. It can evenly diffuse throughout the system with the flow of PVC molecules during the processing process, and will not rapidly migrate to the surface during the use process due to too fast a diffusion speed. This stable diffusion behavior is closely related to its molecular structure and the interaction force between it and PVC molecules.
III. Supplementary Roles in Different Typical Applications
Supplementary Role in Masterbatches
In masterbatches, in addition to improving the dispersibility of pigments and fillers, UCWAX 108A may also have a positive impact on the stability of pigments. It can form a thin protective film around pigment particles, preventing pigment agglomeration or chemical reactions during storage and use, thereby ensuring the color consistency and stability of masterbatches.
Supplementary Role in Profiles
For PVC profiles, the moderate external lubricity of UCWAX 108A not only helps the profiles to be smoothly demoulded from the mould, but also can reduce friction during subsequent processing such as cutting and assembling of the profiles. In terms of improving glossiness, it can make the surface of the profiles smoother, which has a certain improvement on the self - cleaning performance of the profiles when used outdoors, reducing the adhesion of dust and dirt.
Supplementary Role in Pipes and Pipe Fittings
In the production of pipes and pipe fittings, in addition to helping to fill the mould, the improved fluidity of UCWAX 108A can also reduce the torque of the screw during the extrusion process of pipes, reducing the wear of equipment. In terms of improving physical properties, its improvement on the dispersion of fillers and pigments can make the stress distribution more uniform when pipes and pipe fittings bear pressure, improving their pressure - bearing performance.
Supplementary Role in Louvers, Wood - Plastic Composites and Pellets
In the production of louvers, in addition to the lubricity being helpful for the opening and closing operations, UCWAX 108A may also affect the color durability of louvers. In wood - plastic products, it can enhance the binding force between different phases inside the wood - plastic materials, improving the overall strength of the wood - plastic products. In pellet production, its improvement on the rheological properties of pellets may make pellets have a wider adaptability in different molding processes (such as injection molding, extrusion, etc.).
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