Do You Know the Role of High-density Oxidized Polyethylene Wax OA9 in the Pultrusion Process?
As a type of high-performance additive, high-density oxidized polyethylene wax has common application scenarios including: rigid PVC products industry, coating industry, textile industry, papermaking industry, etc. In fact, high-density oxidized polyethylene wax has a wide range of applications, and its application fields are constantly expanding, with many new areas being continuously developed.
As the saying goes, "Different trades are as separate as mountains." When it comes to the pultrusion process of carbon fiber-reinforced epoxy resin composites, those outside the industry can only rely on search engines to learn about it. Baidu states: "This process refers to the process of pulling continuous carbon fibers impregnated with epoxy resin through a heated die to form profiles with a predetermined cross-section. The procedure involves: impregnating carbon fiber reinforcement materials with resin; after preforming, the carbon fibers enter a heated mold for further impregnation, curing of the matrix resin, and shaping of the composite material; and cutting the profiles to the required length. In this process, there are two methods for impregnating carbon fibers with epoxy resin: one is the resin bath impregnation method, in which the reinforcement material is impregnated by passing through a resin tank before entering the mold, and this method is usually adopted; the other is the injection impregnation method."
The raw materials involved in the pultrusion process of carbon fiber-reinforced epoxy resin composites include epoxy resin, carbon fiber, anhydride-based fibers, accelerators, and mold release agents. Among these, epoxy resin serves as the matrix material, carbon fiber as the reinforcement material, and high-density oxidized polyethylene wax OA9 as the mold release agent. Yes, this is the key point I want to emphasize.
In the pultrusion process of carbon fiber-reinforced epoxy resin composites, the resin system and mold release agent are mixed uniformly at a mass ratio of 100:1 and injected into the resin bath of the pultrusion equipment. The pultrusion mold adopts a three-stage gradient temperature heating method with a temperature range of 120-160°C and a pultrusion speed of 0.3-0.6 m/min to prepare pultruded carbon fiber unidirectional composites. Some composites undergo post-curing at below 200°C for 1 hour.
In this process, high-density oxidized polyethylene wax OA9 plays a role in improving resin flow, increasing pultrusion line speed, enhancing product surface quality, and does not affect subsequent processing of the products.
