The full name of nylon 66 is polyhexamethylene adipamide yarn, which is polymerized from adipic acid and hexamethylene diamine. Due to the difference of monomer raw materials, the hydrogen bond arrangement regularity of nylon 66 is better than that of nylon 6 yarn, giving it a strong dense polymer structure. It has good comprehensive properties, such as high mechanical strength, good rigidity, impact resistance, oil resistance, chemical resistance, wear resistance and self lubrication, especially better hardness, rigidity, heat resistance and creep performance.