1.The Introduction on ABS
ABS (Acrylonitrile Butadiene Styrene) is a terpolymer of acrylonitrile, butadiene and styrene, A represents acrylonitrile, B represents butadiene, and S represents styrene. Acrylonitrile has high strength, thermal stability and chemical stability; butadiene has toughness and impact resistance; styrene has easy processing, high gloss and high strength.
The engineering plastic ABS copolymerized from acrylonitrile, butadiene and styrene is a kind of non-crystalline, high-strength, high-toughness, high dimensional stability, easy to process and other characteristics of thermoplastic polymer materials, also known as ABS resin.
The appearance of ABS is opaque ivory pellets, non-toxic, odorless, low water absorption and 90% high gloss. ABS materials are available in a variety of fields, such as ivory and black. They are widely used in various fields, such as automobiles, textiles, instrumentation, electronics, and construction. They are a very versatile thermoplastic engineering plastic. ABS plastic has various excellent properties such as good impact strength, good dimensional stability, heat resistance, low temperature resistance, excellent electrical properties and wear resistance, and its chemical resistance is also very strong. It is more suitable for forming and machining. ABS has good bonding with other materials, and is easy to surface printing, coating and coating treatment, such as surface metallization, electroplating, welding, hot pressing and bonding. Plastic ABS resin is one of the most widely used and widely used polymers. It combines the various performance advantages of PB, PAN and PS, and has excellent mechanical properties such as toughness, hardness and rigid phase.
In addition, ABS resin can be blended with a variety of resins into a blend, such as PC / ABS, ABS / PVC, PA / ABS, PBT / ABS mixing can produce new properties for new applications. In 3D printing, ABS is a thermoplastic engineering plastic commonly used in FDM molding processes.
1.The Feature of ABS
The performance of ABS materials is mainly divided into the following aspects.
(1) General performance.
ABS is a kind of resin with good comprehensive performance. It has high impact strength and surface hardness in a wide temperature range. The heat distortion temperature is higher than PA, polyvinyl chloride (PVC) and dimensional stability. The flowability of ABS melt is better than that of PVC and PC, but it is worse than polyethylene (PE), PA and polystyrene (PS), and similar to polyoxymethylene (POM) and impact polystyrene (HIPS). The flow characteristics of ABS are non-Newtonian fluids, and their melt viscosity is related to processing temperature and shear rate, but is more sensitive to shear rate. ABS has excellent thixotropy and is suitable for FDM printing.
(2) Mechanical properties.
ABS has excellent mechanical properties:
First of all, its impact strength is excellent and can be used at extremely low temperatures. Even if the ABS product is destroyed, it can only be tensile damage without impact damage;
Secondly, ABS has excellent wear resistance, good dimensional stability and oil resistance, so it can be used for bearings under medium load and speed. The creep of ABS is larger than that of polysulfone (PSF) and PC, but smaller than PA and POM. In plastics, the bending strength and compressive strength of ABS are poor, and the mechanical properties are greatly affected by temperature.
(3) Thermal properties.
ABS is an amorphous polymer, so there is no obvious melting point, high melt viscosity, poor fluidity, poor weather resistance, ultraviolet light can change its color; heat distortion temperature is 70 C~107 C (about 85 C), and its After the product is annealed, the heat distortion temperature can be increased by about 10 C. ABS is sensitive to temperature and shear rate, and can exhibit certain toughness at -40C, so it can be used for a long time in the range of -40C to 85C.
(4) Electrical properties.
ABS has good electrical insulation and is hardly affected by temperature, humidity and frequency, and can be used in most environments.
(5) Environmental performance.
ABS is not affected by water, inorganic salts, alkali alcohols and hydrocarbon solvents and various acids, but is soluble in ketones, aldehydes and chlorinated hydrocarbons. It can be stress cracked by glacial acetic acid, vegetable oil, etc.
1.The application of ABS materials in 3D printing
ABS is the most commonly used thermoplastic for 3D printing, but it is not biodegradable. ABS's good strength, flexibility, machinability and high temperature resistance often make it the plastic of choice for engineers. In addition, it has excellent wear resistance and impact absorption. The biggest accuracy obstacle of most ABS parts is that the printing surface that is in direct contact with the working substrate of the 3D printer is prone to upward curling. This requires heating the working substrate (usually 50~110C) in advance to ensure that the bottom of the model is smooth, flat and clean to eliminate curling phenomenon. Studies have found that using ABS/acetone blends or using a hair spray gun can avoid curling on the printed surface. However, when printing large objects, care should be taken to warp the deformation caused by thermal stress during cooling of the 3D model.
1.Other modified ABS materials that can be used for 3D printing
In order to further improve the performance of ABS materials and make ABS materials more in line with the practical application requirements of 3D printing, people have modified the existing ABS materials, and developed ABS-ESD, ABSplus, ABSi and ABS-M30i for 3D. Printed new ABS modified material