As the largest and most important variety of engineering plastics, nylon has strong vitality, mainly because it has been modified To achieve high performance, followed by automotive, electrical, communications, electronics, machinery and other industries to meet high performance requirements. product. The development of related industries has become more and more intense, which has promoted the development of high-performance engineering plastics. The future development trend of modified nylon is as follows.

1 The market's demand for high-strength and high-rigidity nylon is increasing. New reinforcing materials such as inorganic whisker reinforcement and carbon fiber reinforced PA will become important varieties, mainly used in automobile engine parts, mechanical parts and aerospace equipment parts.

2 Nylon alloying will become the mainstream of the development of modified engineering plastics. Nylon alloying is an important way to realize the high performance of nylon, and it is also the main method to manufacture special nylon materials and improve the performance of nylon. The blending of other polymers improves the water absorption of nylon, improves the dimensional stability of the product, as well as low temperature brittleness, heat resistance and abrasion resistance. Therefore, it is suitable for different requirements of vehicle types.

The manufacturing technology and application of 3 nano nylon will be developed rapidly. The advantage of nano nylon is that its thermal properties, mechanical properties, flame retardancy and barrier properties are higher than pure nylon, and its manufacturing cost is comparable to ordinary nylon. Therefore, it is very competitive.

4 The number of flame-retardant nylon used in electronics, electrical appliances and electrical appliances is increasing, and green flame-retardant nylon has attracted more and more attention from the market.

5 Antistatic, conductive nylon and magnetic nylon will become the materials of choice for electronic equipment, mining machinery, and textile machinery.

6 The research and application of processing aids will promote the process of functionalization and high performance of modified nylon.

7 The application of comprehensive technology and the refinement of products are the driving force for its industrial development. Polyamide fiber has a C9-NH group in the macromolecular chain. The commonly used aliphatic polyester amines are mainly polyamide 6 and "polyamide 66". Our trade names are nylon 6 and nylon 66. Nylon fibers are mainly composed of filaments, and a small amount of short fibers are mainly used for blending with cotton. , Wool or other chemical fibers. Nylon filament yarns are used in a large number of texturing processes to produce elastic yarns as raw materials for weaving or knitting. Nylon fibers are usually spun by melt spinning.

The strength of nylon 6 and nylon 66 fibers is 4~5.3cN/dtex, the strength of high-strength polyester is 7.9cN/dtex or more, the elongation rate is 18%~45%, and the elasticity under 10% elongation rate The response rate is more than 90%. According to the measurement, the abrasion resistance of nylon fiber is 20 times that of cotton fiber, 20 times that of wool, and 50 times that of viscose. Anti-fatigue is the first of all types of fibers.

It is widely used in the processing of civilian socks and other blended products to improve the abrasion fastness of the fabric. However, the modulus of nylon fiber is low, and its anti-wrinkle performance is not as good as polyester, which limits the application of nylon in the field of clothing. The life of nylon cord is three times that of viscose fiber, and the impact absorption energy is large. Therefore, the tires can drive on harsh roads. However, due to the large elongation of the nylon cord, when the car is stopped, the tire deformation is flat, and the car jumps at the beginning of the start. Big. Therefore, it can only be used for truck tires and should not be used as tire cords for passenger cars.

The surface of nylon fiber is flat, and the friction coefficient of fiber without oiling agent is very high. The storage of nylon oil agent is prone to failure, and the oil agent needs to be added again in the textile processing process. The moisture absorption of nylon fiber is higher than that of polyester. The moisture regain of nylon 6 and nylon 66 under standard conditions is 4.5%, second only to vinylon in synthetic fibers. It has good dyeing performance and can be dyed with acid dyes, disperse dyes and other dyes.