Which is better, spandex or milk silk? Which is better, milk silk or pure cotton?

Milk silk is a very popular clothing fabric. It is durable, washable, easy to store, suitable for close-fitting wear, and a good partner for underwear making. Milk silk is a synthesis of natural fibers and protein fibers.

Milk silk is a very soft fabric that feels a bit cool to wear, while spandex is a very stretchy fabric that is commonly used for tights, sportswear, jockstraps and shoe soles.

1. What kind of fabric is spandex?

Spandex is a polyurethane fiber. Because of its excellent elasticity, it is also called elastic fiber. It has been widely used in clothing fabrics and has the characteristics of high elasticity. Its main use is in the manufacture of tights, sportswear, jockstraps and soles. Its varieties can be divided into warp elastic fabrics, weft elastic fabrics and warp and weft bidirectional elastic fabrics according to the needs of use. At present, the fabrics of fabrics are mostly natural fibers and artificial fibers. For example, cotton is a natural fiber with good air permeability and moisture absorption properties, but poor elasticity and easy deformation. Artificial fiber, as the name suggests, is a fiber artificially synthesized according to demand, which solves some of the shortcomings of natural fibers. Spandex is a polyester fiber that is an artificial chemical synthetic fiber. Because it has very good elasticity, it is also called elastic fiber. Different proportions of spandex are generally mixed into clothing fabrics to increase elasticity and comfort, and it is widely used.

2. What kind of fabric is milk silk?

Milk silk is the material that many underwears choose now. You don't have to worry about it pricking you, and it is very comfortable. Milk silk is milk protein obtained by skimming and dehydrating liquid milk, adding softener to make milk slurry, and then spinning it into milk protein fiber through wet spinning process and scientific treatment, and further spinning it into milk silk that can be woven. No formaldehyde azo additives or raw materials are used, and the fiber formaldehyde content is zero; it is rich in 18 kinds of amino acids that are beneficial to the human body, can promote human cell metabolism, prevent skin aging and itching, and nourish the skin; it has a natural moisturizing factor, so it can maintain the moisture content of the skin, make the skin soft and smooth, reduce wrinkles, and has a broad-spectrum antibacterial function, strong durability, natural antibacterial function of more than 99%, and antibacterial rate of more than 80%.

1. Milk silk is smooth, elastic, does not deform, has poor air permeability and drainage. Cotton is breathable and perspiration-wicking, has strong water absorption, and is comfortable next to the body. However, the disadvantage of cotton is that it fades and deforms. Wearing clothes made of milk silk looks good, but it is definitely not as comfortable as cotton.

2. Cotton is more suitable for summer. Cotton has better air permeability and absorbs sweat more. Milk silk is not as breathable as cotton. Pure cotton absorbs sweat better, but milk silk is super comfortable to wear in summer and feels very smooth. I personally prefer milk silk because pure cotton feels wet after absorbing sweat.

Real milk silk fabric is not easy to pilling. Milk silk fabric has a cashmere-like feel. Its single filament is fine, its specific gravity is light, and its elongation at break, curl elasticity, and curl recovery rate are closest to cashmere and wool. The fiber is fluffy and soft, and feels soft, comfortable, and smooth like cashmere. The fiber is white, has a silky natural luster, and has an elegant appearance. Its anti-pilling fastness, anti-sunlight fastness, and anti-perspiration fastness are 4 to 3 levels, and it is very easy to dry. The cross section of milk protein fiber is irregularly circular, with gaps in the cross section and many grooves in the longitudinal direction. The protein molecules are distributed on the surface of the fiber, containing natural protein moisturizing factors and a large number of hydrophilic groups. It can quickly absorb human sweat and quickly introduce it into the air through the grooves to dissipate it, so that people's skin always remains dry. The anti-pilling and pilling properties reach 3 to 4 levels. Milk silk fabric is the most potential fiber today. In addition, it can be blended with other fabrics, so it can also produce sportswear, casual wear, shirts, and high-end ready-made clothing fabrics.

1. Combustion Identification Method

1. Close to flame: melt and curl.

2. Melting flame: curling, melting, burning.

3. Leave the flame: burn, sometimes extinguish itself.

4. Smell when burning: burning hair.

5. Residue characteristics: black, basically crisp, but with very small amounts of lumps.

2. Dissolution Identification Method

When milk protein fiber is heated at a constant temperature of 100°C for 30 minutes in a 2.5% NaOH solution, the unique phenomenon of milk protein will appear.

State: During the entire dissolution process, the fiber volume expands and gradually becomes jelly-like, and the color gradually changes from natural color to dark red, and then fades from dark red to light yellow.

Result analysis: If there is a burning smell of hair when the burning flame is just extinguished and the dissolution result is consistent with the jelly-like and unique color reaction, the sample is milk protein fiber.