PC has excellent mechanical properties, heat resistance, good dimensional stability and electrical insulation properties, and has the characteristics of non-toxic and low water absorption, can be used within a wide temperature range, but the PC's melt viscosity is large , Flowability, chemical resistance and wear resistance are poor, these defects to some extent limit its application. PBT is a semi-crystalline material, its crystallization rate is fast, the melt fluidity is good, and it has good solvent corrosion resistance, but its heat resistance is poor, high temperature rigidity is insufficient, and it is sensitive to notch and shows brittleness.
The PC/PBT alloy material prepared by utilizing the technology of blending modification and making full use of the advantages of both materials has been widely used in the market, such as automobile luggage support base, automobile bumper, automobile traction cover plate, and safety. Helmets , body guards, safety toe caps and medical instrument connectors and more.
In recent years, with the advancement of technology and the demand for special product functions, the application of PC/PBT alloy materials has also become diversified in the molding method of the products. In addition to the common injection molding methods, the dimensional stability and material cost savings are taken. Gas-assisted molding methods are also increasingly valued by the industry, a typical application is the car door handle.
Gas-assisted molding products (such as outer door handles) are often very demanding on materials, such as material viscosity, processability, thermal stability, mechanical strength, chemical corrosion resistance and so on. The above-mentioned demanding requirements have made it difficult for ordinary PC/PBT materials to advance in gas-assisted molding applications. Once considered, problems such as pitting, yellowing, shrinkage, and failure of strength tests often occur.
Jia Yi Rong TMSAG-005 is an epoxy polymer anti-hydrolysis agent, for the gas-assisted molding process in the PC / PBT excessive transesterification, hydrolysis phenomenon, to provide effective protection and improve the thermal stability of the material, ensure material processing safety.
The gas-assisted molding cycle is several times that of the ordinary injection molding cycle. We simulated the actual processing temperature of the material and conducted an enhanced thermal aging test to evaluate the thermal stability of the material: the PC/PBT material was stuck in the injection molding machine for different time. board.
As can be seen from the figure, the PC/PBT alloy without SAG-005 added retained a large amount of silver on the surface after 10 minutes of residence time, while the SAG-005-added post-material exhibited excellent thermal stability.
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