The origin of the development of polyamide

The origin of the development of polyamide

Polyamide plastic is developed on the basis of polyphthalamide fiber. It is the first thermoplastic plastic that can bear the load. It is also the variety with the largest output, the most variety and the most versatile among the five general engineering plastics. PA is a general engineering plastic with a long history and a wide range of uses. In 2000, the world engineering plastics market was allocated as PA 35%, PC 32%, POM 11%, PBT 10%, PPO 3%, PET 2%, UHMWPE 2%, high performance Engineering plastics (PPS, LCP, PEEK, PEI, PESU, PVDF, other fluoroplastics, etc.) 2%. Due to the rapid growth of PC market demand, its market share has exceeded PA

From a comprehensive consideration of performance and price, the market consumption of Pa6 and Pa66 still accounts for about 90% of the total PA, occupying a dominant position. In 2001, the consumption of PA66 in the world was 740,000 tons, slightly higher than the 680,000 tons of PA6. The consumption structure in Europe is PA6 accounting for 50%, PA66 accounting for 40%, PA11, PA12 and other homopolymerized and copolymerized PAs accounting for 10%, the consumption of PA66 in the United States exceeds other varieties, and the consumption of PA6 in Japan ranks first with 52%, and PA66 accounting for 38. %, PA11 and PA12 account for 5%, PA46 and semi-aromatic PA account for 5%. PA engineering plastics are mainly injection molded, and injection molded products account for about 90% of PA products. The molding process of PA6 and PA66 is different. PA66 basically uses injection molding, accounting for 95%, and extrusion molding only accounts for 5%; PA6 The injection molding products accounted for 70%, and the extrusion molding accounted for 30%.

Polyamide resin, the English name is polyamide, abbreviated as PA. Commonly known as nylon (Nylon), it is the variety with the largest output, the most variety and the most versatile among the five major engineering plastics. The main varieties of nylon are nylon 6 and nylon 66, occupying an absolute dominant position. Nylon 6 is polycaprolactam, while nylon 66 is polyhexamethylene adipate. Nylon 66 is l2% harder than nylon 6, followed by nylon 11. Nylon 12, nylon 610, nylon 612, in addition to nylon 1010, nylon 46, nylon 7, nylon 9, nylon 13, new varieties include nylon 6I, nylon 9T and special nylon MXD6 (barrier resin), etc., modified nylon There are many varieties, such as reinforced nylon, monomer cast nylon (MC nylon), reaction injection molding (RIM) nylon, aromatic nylon, transparent nylon, high impact (super tough) nylon, electroplated nylon, conductive nylon, flame-retardant nylon , Nylon and other polymer blends and alloys, etc., to meet different special requirements, widely used as metal, wood and other traditional material substitutes

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