Polymer Coupling Agents – Intralayer Adhesives Based on Polyethylene and Polypropylene Treated with Maleic Anhydride and Acrylic Acid

Application:

These polymers are used in three-layer coating systems of oil and gas pipes.


Certified ByTrust

Product Introduction:

In polymer mixtures, especially when the base polymer has a low polarity (especially in polyethylene and polypropylene mixtures), the dispersion of components with higher polarity such as fillers or some polar additives will be associated with problems. In such cases, components that have both polar and non-polar components in their molecular structure should be used. The most common compounds used for such applications are polyethylene treated with maleic anhydride and polypropylene treated with maleic anhydride.

Maleinated or grafted polyolefins with acrylic acid or a combination of both (grafted with acrylic acid and maleic anhydride) have a non-polar main chain on the one hand, and on the other hand, the maleic anhydride groups grafted on them have high polarity, which provides this dual behavior.

Technical Specifications:

This product is continuously produced by reactive extrusion method. The main reactive components in this process are polyethylene, maleic anhydride and/ or acrylic acid and peroxide compounds that produce radicals. In this process, the base polymer along with fillers, carbon black and additives are introduced from the entrance at the beginning of the extrusion process. In this section, dispersion and preparation of a uniform polymer mixture is achieved. In the middle part, a solution of peroxide and solvent components along with maleic anhydride and/or acrylic acid are injected into the extruder. Peroxide is broken at high temperature inside the extruder and creates free radicals. By separating a hydrogen from the polymer chain, this free radical creates a free radical on it, which then attacks the double bond in the maleic anhydride structure and reacts with it. It is in this order that the connection of maleic anhydride to the polymer chain occurs. The degree of maleation or grafting with acrylic acid, changes in molecular mass, molecular mass distribution, the amount of maleic anhydride and/or acrylic acid remaining in the final mixture, etc. are all things that will affect the quality of the final product. One of the most important features of this product is Mellat Flow Index (MFI). Since in the process of maleation, the molecular mass of the polymer chains itself changes (generally, polyethylene increases and polypropylene decreases), MFI is considered as a determining characteristic for the final product. The MFI of the examined product based on the ISO1133 standard test method (with a weight of 2.16 kg and a temperature of 190 ºC) is generally in a wide range of GR/10MIN8/0-15. Crystallization temperature is another important feature of this product because when used as a TIE LAYER, it must have a crystallisation temperature close to that of the covering polyethylene layer in order to create a more effective bond between them. The measurement of this temperature is done using the ISO 3146 standard test method and is generally in the range of 100-120 ºC.

Advantages:

High quality production on a large scale

Company

Type

This product is a final B2B customer product.

SKU: 13051 Category: 
Product Categories
My Cart
Categories