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What kind of plastic is pa? What is the nature

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PA is polyamide, with higher wear resistance than all other fibers, 10 times higher than cotton and 20 times higher than wool

there are many kinds of PA, including PA6, PA66, pall, PA12, PA46, PA610, pa612, PA1010, as well as many new varieties of semi aromatic nylon PA6T and special nylon developed in recent years

nylon-6 plastic products can use metal sodium and sodium hydroxide as the main catalyst and n-acetylcaprolactam as the cocatalyst δ- Caprolactam is directly prepared by negative ion ring opening polymerization in the model, which is called cast nylon. This method is convenient for manufacturing large plastic parts

Application of PA:

because polyamide has non-toxic, light weight, excellent mechanical strength, wear resistance and good corrosion resistance, it is widely used to replace copper and other metals to manufacture bearings, gears, pump blades and other parts in machinery, chemical industry, instrument, automobile and other industries. Polyamide has high strength after melt spinning. It is mainly used as synthetic fiber and can be used as medical suture

in civil use, it can be blended or pure spun into various medical and knitwear. Nylon filament is mostly used in knitting and silk industry, such as weaving single silk stockings, elastic silk stockings and other wear-resistant nylon stockings, nylon gauze, mosquito nets, nylon lace, elastic nylon coat, all kinds of nylon silk or interwoven silk products. Nylon staple fiber is mostly used to mix with wool or other chemical fiber wool products to make all kinds of wear-resistant clothing materials

reference to the above: Baidu Encyclopedia PA

concept of plastic raw materials 1 The main component of plastic raw material is resin. 2 plastic raw material: it is a material with high molecular synthetic resin (polymer) as the main component and infiltrated into various auxiliary materials or additives. It has plasticity and fluidity under specific temperature and pressure, and can be molded into a certain shape and remain unchanged under certain conditions. 3 Polymer: refers to the pure material or polymeric material produced by the polymerization process Both natural resin and synthetic resin belong to polymer, which is referred to as polymer for short Plastic has good insulation to electricity, heat and sound: excellent electrical insulation, arc resistance, thermal insulation, sound insulation, sound absorption, vibration absorption and noise elimination Most of the plastic raw materials are extracted from some oils. The most familiar part of PC material is extracted from oil. PC material has a smell of gasoline when burning; ABS is extracted from coal. When ABS is burned out, it will be in the form of soot; POM is extracted from natural gas. When POM is burned, it will have a very smelly gas smell. The characteristics of general plastic raw materials A. plastic raw materials expand when heated, and the linear expansion coefficient is much larger than that of metal; b. The rigidity of general plastic raw materials is one order of magnitude lower than that of metal; c. The mechanical properties of plastic raw materials will decrease significantly under long-term heating; d. General plastic raw materials will have permanent deformation under long-term stress at room temperature and stress lower than its yield strength; e. Plastic materials are very sensitive to notch damage; f. The mechanical properties of plastic raw materials are usually much lower than those of metals, but the specific strength and specific modulus of some composites are higher than those of metals. If the product design is reasonable, it will give full play to its advantages; g. Generally, the mechanical properties of reinforced plastic raw materials are different; h. Some plastic materials will absorb moisture and cause changes in size and properties; i. Some plastics are flammable; j. At present, the fatigue data of plastic raw materials are very few, which should be considered according to the use requirements Classification of plastic raw materials according to the molecular structure of synthetic resin, plastic raw materials mainly include thermoplastic and thermosetting plastics: for thermoplastic plastics, it refers to plastics that still have plasticity after repeated heating: it mainly includes PE /PP /PVC /PS /ABS /PMMA /POM /PC /PA and other common raw materials Thermosetting plastics mainly refer to the plastics made of synthetic resin hardened by heating, such as some phenolic plastics and amino plastics, which are not commonly used According to the application scope, it mainly includes general plastics such as PE /PP /PVC /PS and engineering plastics such as ABS /POM /PC /PA In addition, there are some special plastics, such as high temperature, high humidity and corrosion resistance, and other plastics modified for special purposes Material utilization and color treatment 1 Most of the plastic raw materials can be recycled, but because the reused plastic (nozzle material) is more brittle than ordinary raw materials, it can only be mixed with new materials (raw materials), and the maximum proportion can not exceed 25%, which should be based on the standard required by customers Various types of plastic materials are subject to different injection pressure due to different melting points. They must not be confused in production. 2 Because plastic products should match with the color, plastic raw materials can be divided into: granulated materials, toner materials, color seed materials, and the recent addition of liquid to color in plastic raw materials The raw material for granulation is that the pigment has been mixed into the raw material, and each plastic material has been colored, so the color of the product is stable and uniform Toner material and color seed material are used by mixing color seed or toner with raw materials, which has low cost and does not need to store a large number of colored raw materials However, the color is unstable and it is difficult to control the unity in production

PA plastic (nylon, polyamide), English Name: polyamide. According to the Guangdong PA modified plastic manufacturer, PA plastic was the first resin developed for fiber by an American company, which realized industrialization in 1939. In the 1950s, injection molding products were developed and produced to replace metals and meet the requirements of lightweight and cost reduction of downstream industrial products
PA plastic has good comprehensive properties, including mechanical properties, heat resistance, wear resistance, chemical resistance and self lubrication. It has low friction coefficient, certain flame retardancy and is easy to process. It is suitable for filling and strengthening modification with glass fiber and other fillers, improving performance and expanding application range
there are many kinds of PA plastics, including PA6, PA66, pall, PAL2, PA46, PA610, pa612, pal010, as well as many new varieties of semi aromatic nylon PA6T and special nylon developed in recent years
PA plastic is a general engineering plastic with a long history and wide applications. In 2000, the world engineering plastic market was allocated as pa35%, PC32%, pom11%, pbt1o%, ppo3%, pet2%, uhmwpe2%, and 2% of high-performance engineering plastics (PPS polyamide, LCP, peek, Pei, PESU, PVDF, other fluorine-containing plastics, etc.).

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