Biobased PA56 is prepared from renewable resources such as corn and wheat by microbial method and then polymerized with adipic acid. Its properties are similar to those of PA6 and PA66, and it can be used in textile, engineering plastics and other fields.In terms of environmental impact, it can replace some petroleum based polyamide fiber products.

Physical properties of

The density of biological PA56 is generally 1.12 ~ 1.14 g/cm3, which has good mechanical properties. Hydrogen bonds can be formed between the chain segments of the fiber, and the fracture strength is similar to that of PA6.When the drafting multiple of biobased PA56 filament with different viscosities is 3 ~ 3.5, the fracture strength and initial modulus increase with the drafting multiple increasing.There is hydrophilic amide group in the fiber, which gives the fiber certain hygroscopicity, not easy to generate static electricity, and has soft feel.The saturated water absorption rate of bio-based PA56 is 14%, higher than PA6 and PA66, so it has better comfort in wearing and wearing.

The dyeing performance

Biobased PA56 fibers can be dyed with weak acid dyes, reactive dyes and disperse dyes with strong polarity.In its molecular structure, the number of carbon atoms on main chain segments similar to PA6, PA66, fewer but more PA66 diamine with a single carbon atom, make originally can generate hydrogen bond in the PA66 parts is the free state of hydrogen and oxygen, thereby increasing PA56 dyeing locus, and the addition of carbonyl amino of fiber and water absorption, and internal migration, make PA56 dyeability and softness.

Taking performance

Bio-based PA56 fiber has excellent physical and chemical properties, and has a broad application prospect in the field of consumption due to its softness, anti-pilling, moisture absorption and flame retardant.The asymmetric structure between molecules makes PA56 similar in softness to wool without affecting its strength and wear resistance.

The application situation

Bio-based PA56 fibers currently include filament, staple and composite fibers, among which filament includes pre-oriented filament (POY), stretch textured filament (DTY) and fully stretched filament (fdy).Bio - PA56 staple yarns have little hairiness and are smooth and soft to weave.The basic properties of PA56 are similar to those of traditional polyamides, and it can be blended with wool, cellulose fiber (cotton, viscose fiber, tiansi TM), polyacrylonitrile fiber, acetate fiber, polyester fiber, etc., which has certain application prospects in the field of consumption.PA56 has good softness and can increase yarn strength when blended with wool.

In addition, bio-based PA56 can also be used as raw materials for industrial textiles, military textiles, engineering plastics, food packaging films, etc.PA56 can be made into expanded yarn with better strength and hygroscopicity than PA6 and PA66, higher degree of pomeness and better flame retardant than PA6 and PA66, which can be used for weaving carpets.In the field of industrial use, it is mainly used as cord fabric, used as the frame fabric of rubber products such as tires, fishing net silk and cable etc.In military textile, it can be used for processing parachute, tent, sleeping bag, etc.

For more information, please pay attention to "the performance and application of bio-based chemical fiber PA56", 2019 issue 8, textile guide.