Polyamide Nylon (Nylon), commonly known as the English name of Polyamide (PA), is on the main chain molecules containing repeated amide groups, [NHCO], thermoplastic resin. Including aliphatic PA, fat - aromatic PA PA and aromatic compounds. Aliphatic PA variety, large output, wide application, its name by the synthesis of monomer specific number of carbon atoms.

Dragon, the main varieties are nylon 6 and nylon 66, accounts for absolute dominant position, followed by nylon 11, nylon 12, nylon 610, nylon 612, as well as nylon 1010, nylon 46, nylon 7, 9 nylon, nylon, 13 varieties with nylon 6, nylon 9 t and special nylon MXD6 resin (barrier property), and so on, the number of varieties of modified nylon is various, such as reinforced nylon, monomer casting nylon (MC nylon), reaction injection molding (RIM) nylon, aromatic nylon, transparent nylon, high impact (super tough nylon, nylon, electroplating, conductive nylon flame retardant nylon, nylon and other polymer blend and alloy, etc., meet the special requirements and widely used for metal, wood and other traditional materials substitute, as various structural materials.

Nylon is one of the most important engineering plastics, production in the five common engineering plastics in the first place.

Performance:

Nylon is ductile angular translucent or milk white crystalline resin, as engineering plastics nylon molecular weight average of 1.5-30000. Nylon has high mechanical strength, high softening point, heat resistance, low friction coefficient, wear resistance, self-lubrication, shock resistance and sound absorption, oil resistant, resistant to weak acid, alkali and solvents, good electrical insulation, self-extinguishing, non-toxic, odourless, good weather resistance, dyeing sex differences. Defect is big water imbibition, affect the dimension stability and electric properties, fiber reinforced can reduce resin bibulous rate, make its can work under high temperature and high humidity. Nylon and glass fiber affinity is very good. Often used to make combs, fan rib, mesh bag, toothbrush, hook line, bagging fruit outsourcing and so on. Non-toxic, but not long-term contact with acid and alkali.

It is important to note that after adding glass fiber, nylon tensile strength can be improved about 2 times, heat-resistant ability also improved accordingly.

Nylon shrinkage rate of 1% ~ 2%.

The history of nylon:

People is no stranger to nylon, nylon products in our daily life everywhere, but so few people know its history. Nylon is one of the world's first developed a kind of synthetic fiber.

In the early 20th century, corporate gay development scientific research is also known as a magical thing. The largest industrial companies in the United States in 1926 - dupont, out of interest in the basic science, suggest the company to carry out the basic research about find new scientific fact. In 1927 the company decided to pay $1927 a year as research cost, and began to hire chemical researchers, by 1928 the dupont company established the basis of chemical research institute, who is 32 carlo geysers (Wallace Carothers, H., 1896-1937) became head of the organic chemistry of the Dr.

Carothers, the us organic chemists. Born on April 27, 1896 in wilmington in Iowa in the United States. On April 29, 1937, died in Philadelphia. After received doctorate from the university of Illinois in 1924, successively in the university and Harvard University as an organic chemistry teaching and research work. In 1928 to apply for in the United States dupont in wilmington, a study on organic chemistry laboratory. He presided over a series of polymerization method to obtain high molecular weight material research. In 1935 with adipic acid and adipic amine as raw material was prepared polymer, because both of the two components contains six carbon atoms, was known as the polymer 66. He will be after the polymer melting by needle injection pressure, stretching called fiber under tension. This kind of fiber polyamide 66, realize industrialization in 1939 entitled Nylon (Nylon), was among the first to realize industrialization of synthetic fiber varieties.

, synthesis of the dragon laid the foundation of synthetic fiber industry, the emergence of nylon textile taken on a new look. Nylon stockings are made with the fabric is transparent and filar socks than durability, dupont and 10 orders, 24, 1939 in total of seat sale nylon stockings caused a sensation, is considered a rare thing in snapping up, people have used "as fine as silk, like steel wire is strong, like spun silk beauty" words to praise the fiber, nylon fiber by May 1940 textile sales throughout the United States.

Since the second world war until 1945, nylon industry was steering system of the parachute, aircraft tire cord fabrics, uniforms and other military products. Due to the characteristics of nylon and wide range of USES, is developing rapidly after the second world war, the nylon products from stockings, clothing to carpet, fishing nets, etc., appeared in countless ways, is one of the three synthetic fiber.

Made from nylon balloon can do a lot of characteristics

1. Dupont Tactel nylon fabric soft and comfortable, and its good hygroscopicity can balance humidity difference between air and body, so as to relieve the pressure of the body, has the adjustment effect.

2. Special lightweight, easy to maintenance.

3. Machine washable, dry time three times faster than cotton, only small iron or iron free, is not easy to deformation, has significant crease resistant ability.

4. Because of the remarkable resilience, make it can be after stretching back to its original state.

Modification of nylon

Because of the characteristic of the PA strong polarity, hygroscopicity strong, dimension stability is poor, but can be modified to improve.

Glass fiber reinforced PA

Joined 30% glass fiber in PA, PA, mechanical properties, dimensional stability, heat resistance, aging resistance, resistance to fatigue strength is not increased 2.5 times. Molding process of glass fiber reinforced PA and strengthened at roughly the same, but because of the flow is strengthen the difference before, so is the appropriate increase in injection pressure and injection speed, barrel temperature increase 10 to 40 ℃. Because of the glass fiber in injection molding process will take to along the flow direction, mechanical properties and shrinkage caused by strengthening, in the direction of orientation lead to products deformed, therefore, mold design, gate location, shape, reasonable, craft can increase the temperature of the mold, the products are removed in the heat Allow it to cool down slowly in the water. In addition, the greater the proportion of adding glass fiber, its wear plasticizing of injection molding machine components, the greater the best is to use double metal screw and barrel.

• flame retardant PA

Since joined the flame retardants in PA, most of the flame retardant decomposition at high temperature, acid release, has corrosion to the metal effect, therefore, plasticizing components (screw, plastic head, aprons, the rubber gasket, flange, etc.) should be hard chromium plating processing. Process, try to control the barrel temperature not too high, the injection speed cannot too fast, in order to avoid the rubber discoloration caused by high temperature and decomposition products and mechanical performance degradation.

• transparent PA

Good tensile strength, impact strength, rigidity, abrasion resistance, chemical resistance, surface hardness, such as performance, high light transmittance, similar to optical glass, processing temperature is 300-315 ℃, processing, need to strictly control the barrel temperature, melt temperature is too high will be caused by the degradation products, temperature is too low will because of adverse effects and plasticizing products transparency. Mold temperature to get lower, high mold temperature will reduce the transparency of products by crystallization.

Weather resistance, PA

Joined the carbon black in the PA absorb ultraviolet additives, such as the self lubrication and wear of metal of PA increases greatly, forming when under the influence of material and wear parts. Therefore, the need to adopt feed ability and high resistance to wear of the screw, barrel, plastic head, aprons, gluing washer combination.