ASA engineering plastic is a copolymer of butyl acrylate-styrene-acrylonitrile. The mechanical properties of ASA plastic are similar to those of ABS plastic, but ASA plastic uses acrylic rubber without unsaturated double bonds, which improves the material's anti-aging and weather resistance compared to ABS plastic, and can be used as outdoor structural materials. ASA plastic can be divided into general grade, extrusion grade and heat-resistant grade.

Introduction

Its structure is as follows: Specific gravity: 1.05 g/cm3 Molding shrinkage: 0.4-0.7% Molding temperature: 170-230¡æ Drying conditions: 80-90¡æ 2 hours Detailed description of ASA plastic raw materials Specific gravity: 1.05 g/cm3 Molding shrinkage: 0.4-0.7% Molding temperature: 170-230¡æ Drying conditions: 80-90¡æ 2 hours

Detailed description of ASA plastic raw materials

Source of ASA plastic raw materials Plastic raw materials usually come from petrochemicals based on petroleum or natural gas, and are a type of polymer resin obtained through polymerization. Plastic definition: A polymer compound with synthetic resin as the main component. High molecular weight: molecular weight > 10000; medium molecular weight: 1000¡Ümolecular weight¡Ü10000; low molecular weight: molecular weight < 1000; three forms of plastic: glass state; high elastic state; viscous flow state; rather than solid, liquid and gaseous state, it is impossible for it to have liquid and gaseous state (it will decompose before reaching that temperature);

Types and introduction of plastic molding of ASA plastic raw materials: 1. Injection molding (injection molding), 2. Compression molding, 3. Extrusion molding, 4. Extrusion molding, 5. Blow molding, vacuum molding, casting molding, foaming molding, injection principle: Using the thermoplasticity of plastic, the plastic raw material is first dissolved by the screw rotation friction heat and the material tube electric heating to make it into a fluid state, and then injected into the designed mold cavity by injection pressure, and taken out after cooling to form various shapes of molded products. Injection molding: process: process: 1 raw material drying, 2 heating, 3 material storage, 4 plasticization, 5 injection into the mold, 6 cooling, 7 demolding, 8 product. Basic process of plastic injection molding: 1 pressurized dynamic mold filling, 2 injection and pressure holding, 3 solidification and cooling, 4 loosening and retreat, 5 mold closing, 6 mold opening, 7 ejection.

ASA plastic raw material plastic molding machine conditions:? Five major elements of molding conditions 1 pressure injection pressure: control the filling of molten glue. Holding pressure: control the molten glue to not flow back after filling. Back pressure: control the melting of resin. Clamping pressure: control the mold from being opened, 2 speed storage speed (MRP value): control the melting of resin. Injection speed: control the filling of resin. Holding pressure speed: control the resin return during cooling. Opening and closing mold speed: control the movement of the mold. 3 Temperature pipe temperature: control the melting of plastic. Original drying temperature: control the water content of the original. Mold temperature: control the crystallinity and cooling of the molten glue. 4 Time injection time: control the filling of the molten glue. Cooling time: control the solidification of the molten glue. Opening and closing mold time: control the movement of the mold. Intermediate time: control the pause after opening the mold. 5 Position injection stroke: control the filling of the molten glue. Opening and closing mold stroke: control the mold stroke. Robot stroke: control the gripping head.

Classification of plastic of ASA plastic raw materials 1. According to plasticizing properties: thermoplastic and thermosetting plastic Thermoplastic: After the plastic is heated and softened, it can continue to be heated and softened. Thermosetting plastic: After the plastic is heated and softened, it cannot be heated and softened (Bakelite). 2. According to the purpose: general plastic and engineering plastic General plastic: have the common properties of plastic and can be widely used in production. Four general-purpose plastic: PP, PE, PS, PVC Engineering plastic: have special mechanical properties and can be used as engineering materials. ABS, PC, PMMA, POM, PA, PPS, PBT, PET, LCP. 3. According to crystallization: crystalline plastic raw materials and non-crystalline plastic Crystalline plastic: molecular chains are arranged in an orderly manner (PE, PP, POM, PA, PPS); non-crystalline plastic: molecular chains are arranged in a disordered manner (PS, ABS, PC, PMMA).

The application of ASA plastic raw materials ranges from tiny gears and screws to household appliances, telephones, cleaning tools, and even cars, computers, medical equipment, etc. The application of plastic in life is endless. I think plastic are warm to people. Using the soft and bright characteristics of plastic to cover, the cold light emitted by the machine can be covered, so that humans can get along with the machine easily. Therefore, plastic have become an indispensable thing in daily life. As a bridge between humans and high technology, plastic have endless potential to be developed. Here I will discuss with you the common knowledge about plastic products from the following aspects.

Formulation process

ASA resin is mainly produced by blending technology, and the main raw materials are ASA powder and AS resin as well as colorants, antioxidants, internal and external lubricants, etc.

The main equipment is a twin-screw extruder, and other supporting equipment includes high-speed batching machine, automatic weighing feeder, cooling granulator, automatic packaging machine, quality inspection equipment (melt index meter, universal testing machine, etc.). When the production reaches a certain scale, a finished product silo is also required.

ASA firewall

ASA, Cisco ASA 5500 Series Adaptive Security Appliances

(Cisco ASA 5500 Series Adaptive Security Appliances) is a security product of Cisco.

As an upgraded product of PIX, ASA is a security product that integrates firewall, intrusion detection (IDS), and VPN concentrator.

Field Functions

Electronic Field

ASA (Analog Signature Analysis) refers to providing a safe, low-power scanning drive voltage signal to each pin of a component in order to generate an impedance characteristic diagram and display it on a CRT, and it can be stored for comparison. All tests are performed in a static state (without power), so the components will not be damaged. It can not only quickly scan and store the V/I curve graphs of each pin of various ICs, but also is effective for various discrete components such as resistors and capacitors.

Industrial Field

Modified resin (ASA) is a ternary polymer composed of acrylonitrile, styrene, and acrylic rubber that was successfully developed in the 1970s and is an impact-modified resin.

ASA is a ternary polymer composed of acrylonitrile, styrene, and acrylic rubber that was successfully developed in the 1970s and is an impact-modified resin.

ASA is a major product of GE Plastic, a subsidiary of General Electric (GE) in the United States. In August 2002, it was introduced as a co-extrusion raw material to the Chinese PVC color co-extrusion profile market under the registered trademark of Geloy.

ASA plastic raw materials

ASA advantages

1. ASA has good mechanical and physical properties

ASA has a similar structure to ABS, consisting of acrylonitrile and butadiene rubber, and retains the excellent mechanical and physical properties of ABS as an engineering plastic.

2. ASA has strong weather resistance

If a polymer contains double bonds, the double bonds are easily opened by ultraviolet rays in sunlight with high energy intensity, which causes the aging resistance of the polymer to decrease. ASA replaces the butadiene rubber containing unsaturated double bonds in ABS with acrylic rubber without unsaturated double bonds. Therefore, it can not only resist degradation, aging and fading caused by ultraviolet radiation, but also has a strong guarantee for decomposition or discoloration caused by high temperature during oxidation processing in the atmosphere, thereby greatly improving the material's anti-aging and weather resistance. According to the test results, the anti-aging performance of ASA is more than 10 times that of ABS.

3. ASA has relatively good high temperature resistance

4. ASA is an antistatic material that can reduce dust accumulation on the surface

Application fields of ASA

Automotive field: After a long period of wind erosion, ASA will not gradually turn gray like the specially treated anti-aging ABS (many microscopic cracks and cavitation on the surface caused by wind erosion or water flow). Typical applications of ASA are exterior mirrors, radiator grilles, tailgates, lampshades and other external parts that are exposed to harsh conditions such as sunlight, rain, and strong winds. It has gradually extended to motorcycle panels, camping cars, small boat hulls, surfboards and other fields.

Gardening field: ASA has been proven to be particularly suitable for gardening irrigation equipment and lawn mower housings.

Electronic and electrical fields: It is preferentially used for housings of durable equipment, such as sewing machines, telephones, kitchen equipment, satellite antennas and other all-weather housings.

Construction field: ASA/PVC blends are used for roof siding and window materials. In this regard, foreign countries have more than 10 years of practical application experience.

In the United States, due to the good surface quality and long-lasting color stability of ASA, it has been widely used in high-end bathrooms and sanitary products, hot and cold water exchangers, etc., which shows that ASA is also resistant to corrosion by detergents and disinfectants.

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