In The Application Of Industrial Nylon Products, Many Users Cannot Distinguish The Difference Between Nylon 12 And Nylon 6. Today, We Will Introduce The Difference Between The Two

1. Nylon 12 (PA12)

 & nbsp;& nbsp;& nbsp;scientific name:polyamide 12, alias polylaurolactam, English name nylon 12
 & nbsp; & nbsp;function and application:pa12 has a relative density of 1.02g/cm3, which is low in nylon products; Because of its low content of amide group, its water absorption is 0.25%, which is also low in nylon. The thermal decomposition temperature of PA12 is greater than 350℃, and the long-term service temperature is 80-90℃. PA12 membrane has good air tightness, and the water vapor transmission rate is 9g/m2. PA12 is resistant to alkali, oil, ferment, inorganic diluted acid, aromatic hydrocarbon, etc. Therefore, PA12 is widely used in automotive pipeline systems, such as multi-layer fuel pipeline system, vacuum brake booster pipe, hydraulic clutch pipe, central lubrication system pipe, etc. It can also be used for inner pipe of industrial pipeline repair and industrial pipeline system contacting corrosive chemicals. PA12 has good anti noise effect. It is an ideal material for optical fiber sheath, anti termite and mouse, and also an excellent material for cable sheath. The high toughness and strength of PA12 provide higher burst pressure resistance, which can be used as medium pressure natural gas transmission pipe. Now it has been applied in the United States, Western Europe and other countries. PA12 natural gas pipe can withstand higher working pressure and temperature than polyethylene (PE) pipe. PA12 natural gas transmission pipeline can withstand pressure of 0.8 ~ 1.7mpa below 80℃, which can replace steel pipes within this range and is more competitive than polyolefin materials. PA12 is incompatible with most other plastic compounds. Even a small amount of other resin plastic contamination leads to cloudy melts and finished parts. Therefore, before starting the work, the processing machine and all other plasticizing units of the melt channel should be cleaned very carefully. The material of PA12 recycled material must be free from foreign matters and dust particles. The moisture content should be less than 0.1% by weight. A small amount of polymer or even other polyamides will cause turbidity of the corresponding formed parts except for the same PA12 grade. If immediate waste reprocessing is not possible, it is necessary that the gate or defective part should be ground and stored in a moisture-proof bag and reused after careful drying. The amount of recycled material added to the original PA12 material generally depends on some of the required properties, so the parts must be prepared for forming by testing. If the abrasives used allow the end-user's requirements and specifications, it is possible to add 25% recycled material by weight. In some cases, such as extrusion of thick wall profiles, injection molding of thick wall and high surface quality of optical elements or components, particles should be pre dried at any rate to prevent moisture streaks or uneven surfaces from forming
  & nbsp;& nbsp;typical application range:water meters and other commercial equipment, cable sleeves, mechanical cams, sliding mechanisms, bearings, etc

2.nylon 6

  & nbsp; & nbsp; & nbsp; Scientific name:polycaprolactam {[nh (cn2) 5 co] n}, English Name: polycaprolactam is called PA6
  & nbsp; & nbsp; & nbsp; Chemical and physical properties:pa6 is a translucent or not very bright milky white crystalline polymer. Burning into a yellow flame with a blue background, burning plant odor. The melting temperature is lower than PA66, and the processability is better than other PA. The product has high impact strength, good load dispersion, softness, thermoplasticity, light weight, good toughness, resistance to cyclohexanone and aromatic solvents and good durability. Working temperature 80-100℃, low temperature brittleness temperature -20 to -30℃, melting point: 215 ° C. Thermal decomposition temperature: 300℃. Density: 1.13 g/cm3. Equilibrium water absorption: 3.5%. Suitable for use under light load conditions, with good wear resistance, self lubrication and solvent resistance. It has better vibration and noise reduction capability. It can be used for insulation of mechanical instruments, instrument parts, wires and cables; Reinforced with glass fiber, it can be made into gears and pump blades. However, PA6 has high water absorption, and its saturated water absorption is about 10%, which affects its performance. Because of its large dielectric constant, it is not suitable for high frequency and low loss materials. The chemical and physical properties of PA6 are similar to ttubing of PA66, but its melting point is low and the process temperature range is wide. Its impact resistance and solubility are better than PA66, but its hygroscopicity is also higher. The elasticity is greater than PA66, the fatigue strength is hard, and the heat resistance is lower than nylon 66. As many quality characteristics of plastic parts are affected by moisture absorption, this must be fully considered when using PA6 to design products. In order to improve the mechanical properties of PA6, various modifiers are often added. Glass fiber is the most common additive, and synthetic rubbers such as EPDM and SBR are sometimes added to improve impact resistance. For products without additives, the shrinkage of PA6 is between 1% and 1.5%. The addition of glass fiber additive can reduce the shrinkage to 0.3% (but slightly higher in the direction perpendicular to the process). The shrinkage of molding and assembly is mainly affected by the crystallinity and hygroscopicity of the material. The actual shrinkage also depends on the plastic part design, wall thickness and other process parameters