Performance and processing characteristics of ABS profile

ABS profiled properties: ABS is synthesized from three chemical monomers: acrylonitrile, butadiene and styrene. Thermal and chemical stability; butadiene has toughness and impact resistance; styrene has easy processing, high smoothness and high strength.

From the morphological point of view, ABS is a non-crystalline material with high mechanical strength and good comprehensive properties of “toughness, toughness and steel”. It is an amorphous polymer. ABS is a general-purpose engineering plastic. It has a variety of varieties and a wide range of uses. It is also called “general plastic” (MBS is called transparent ABS). ABS is easy to absorb moisture and has a specific gravity of 1.05G/CM3 (ratio Water is slightly heavier), the shrinkage rate is low (0.60%), the size is stable, and it is easy to form and process.

The characteristics of ABS profiles mainly depend on the ratio of the three monomers and the molecular structure of the two phases. This allows great flexibility in product design, and hundreds of ABS materials of different qualities have been produced on the market. These different quality materials provide different characteristics, such as medium to high impact resistance, low to high finish and high temperature distortion characteristics. ABS material has super easy processing, appearance characteristics, low creep and excellent dimensional stability and high impact strength.

ABS profile material is light yellow granular or beaded opaque resin, odorless, low water absorption, and has good comprehensive physical and mechanical properties, such as excellent electrical properties, abrasion resistance, dimensional stability, chemical resistance and surface gloss, etc. And easy to process and shape. The disadvantages are weather resistance, poor heat resistance, and flammability.

 Process characteristics of ABS profile

(1). ABS has high hygroscopicity and moisture sensitivity. It must be fully dried and preheated (at least 2 hours at 80~90C) before molding, and the moisture content is controlled below 0.03%.

(2). The melt viscosity of ABS resin is less sensitive to temperature (different from other amorphous resins). Although the injection temperature of ABS is slightly higher than that of PS, it cannot have a loose heating range like PS, and it cannot be used blindly to increase its viscosity. It can be used to increase the screw speed or injection pressure to improve its fluidity. The general processing temperature is 190-235℃.

(3). The melt viscosity of ABS is medium, which is higher than that of PS, HIPS, AS, and higher injection pressure (500~1000BAR) is required.

(4). ABS material adopts medium and high speed injection speed, which has better effect. (Unless the shape is complex and thin-walled parts require a higher injection speed), the product nozzle position is prone to produce air lines.

(5). ABS molding temperature is relatively high, and its mold temperature is generally adjusted at 25-70℃. When producing larger products, the temperature of the fixed mold (front mold) is generally about 5°C higher than that of the movable mold (rear mold). (Mold temperature will affect the finish of plastic parts, lower temperature will result in lower finish)

(6). ABS should not stay in the high temperature barrel for too long (should be less than 30 minutes), otherwise it will easily decompose and turn yellow.