Polyurethane, a supplier of engineering thermoplastics, developed a Improves metal-plastic bonding performance in composite parts for the automotive and electrical/electronic industries , without the need for pre-processing of metal plugs.
Metal - plastic direct bonding metal is a typical insert molding process in the conventional process, the metal insert and the plastic by injection molding techniques molten plastic into the metal insert has been appropriately surface-treated and firmly joined These metal-plastic composites combine the properties of metals (high stiffness, electrical conductivity) and engineering plastics (low density, electrical insulation). However, due to many unfavorable factors in this method (metal parts, resin materials, mold structures, Effects of injection molding conditions, etc.), difficult to obtain a stable bond, but Polyplastics has made progress in joint stability with its QUICK-10 technology.
The QUICK-10 process utilizes rapid heating and cooling of metal inserts to achieve direct metal-plastic bonding , It only through the injection molding process, and does not require special surface treatment of the metal. However, the plastic used must have interface affinity, surface transferability (flowability) and low shrinkage to achieve good bonding. To this end, Polyplastics has developed suitable polyphenylene sulfide (PPS) and polybutylene terephthalate (PBT) grade plastics.
A key component of the QUICK-10 process is an affinity-improving additive that enables high compatibility of the metal-plastic interface and enhances the maximum adsorption to the metal surface. The metal adsorption capacity of Polyplastics is 1135 MF1 for PPS and 940 Ma for PBT. Additional metal adsorption ratings, 1150 MF1 and 930 Ma, provide additional functionality.
Polyplastics pointed out that the mold temperature has a great influence on bonding. The company has designed the best molding conditions to obtain good surface transferability and low mold shrinkage, and its linear expansion rate is close to the linear expansion of the metal. rate.