What on earth is “milk silk”!

Cow milk / fiber Milk protein fiber is mainly made of milk, with rich sources of raw materials, and due to the production process It adopts high-tech process and will not cause pol…

/ fiber

Milk protein fiber is mainly made of milk, with rich sources of raw materials, and due to the production process It adopts high-tech process and will not cause pollution to the environment. Therefore, milk protein fiber is known as the green fiber of the 21st century.

What is milk fiber?

Milk fiber uses milk as the basic raw material. After dehydration, deoiling, skimming, separation and purification, it becomes a linear large fiber. Molecular structure of milk casein; then blended, cross-linked, and grafted with polyacrylonitrile using high-tech means to prepare spinning solution; finally, wet spinning is used to form fibers, curing, drafting, drying, curling, and shaping , short fiber cutting (filament winding). It is a new type of animal protein fiber that is different from natural fibers, regenerated fibers and synthetic fibers. People also call it “milk silk” and “milk fiber”.

Morphological structure of milk fiber

The cross-section and longitudinal surface morphology of milk fiber were observed with an electron microscope as shown in the figure. The cross-section of the fiber is flat, dumbbell-shaped or waist-round. It is a special-shaped fiber and has tiny pores on the cross-section. These tiny pores have a great impact on the moisture absorption and moisture permeability of the fiber. It is observed from the figure that the longitudinal surface of the fiber is not smooth, with irregular grooves and island-like bumps. These grooves and bumps are formed due to the rapid dehydration and orientation of the fiber surface during the spinning process. Their existence��The main reason why fiber has good moisture conductivity and excellent moisture absorption and release properties also has an important impact on the gloss and stiffness of the fiber. The roughness of the fiber surface and some minor sudden changes can change the absorption, reflection, refraction and scattering of light, thereby affecting the gloss of the fiber. When the fiber surface is rough, it has a soft luster without the “aurora” phenomenon. Milk fiber has a certain curl, is slightly yellow in appearance, and feels soft to the touch.

Advantages of milk fiber

① Softness and skin-friendliness are equal to or better than cashmere;

② Breathable, good moisture conductivity, and comfortable;

③ The warmth is close to cashmere and has good warmth retention;

④ The abrasion resistance, pilling resistance, coloring and strength of milk velvet are better than cashmere; 5. Because milk protein contains amino acids, the skin will not reject it This kind of fabric is similar to a layer of human skin and has a protective effect on the skin.

Fabric advantages:

① More comfortable – excellent moisture conduction and breathability

② The material is extracted from milk and combined with high technology. Its unique function is mixed with other fibers, which not only retains the original fiber characteristics, but also improves the function and quality of the fabric.

③ Healthier and greener – weakly acidic, good affinity with skin.

④ More Multi-color – the feel, color and surface remain unchanged after multiple washes, and the affinity with dyes makes the colors extra bright and vivid.

Milk fiber-performance

Physical and chemical properties

It is different from natural fibers such as cotton, linen, silk and wool, and also different from chemical fibers such as nylon, acrylic, polyester and polypropylene. Therefore, its performance is between natural fibers and synthetic fibers. The physical and chemical index detection values ​​are as follows: dry breaking strength ≥ 2.5cn/dtex; dry breaking strength variation coefficient ≤ 14%; dry breaking elongation 16.0% ~ 25.0%; dry breaking elongation variation coefficient ≤ 12%; linear density deviation Rate ±4.0%; linear density variation coefficient ≤3.5%; dyeing uniformity (gray card) ≥3 to 4 levels; moisture regain rate 4% to 6%; fiber antibacterial rate ≥80%.

Green and environmentally friendly features

No formaldehyde azo additives or raw materials are used, and the formaldehyde content of the fiber is zero ; Rich in 18 kinds of amino acids that are beneficial to the human body, it can promote the metabolism of human cells, prevent skin aging and itching, and nourish the skin; it has natural moisturizing factors, so it can maintain the moisture content of the skin, make the skin soft and smooth, reduce wrinkles, and has a wide range of benefits. Spectrum antibacterial function, strong durability, natural antibacterial function of more than 99%, antibacterial rate of more than 80%

Fiber comfort

Has a cashmere-like feel with its monofilament fineness Thin, light in specific gravity, elongation at break, curl elasticity, and curl recovery rate are closest to those of cashmere and wool. The fiber is bulky and soft, and feels as soft, comfortable, and smooth as cashmere; the fiber is white, with a silky natural luster, and has an elegant appearance. , the fastness to sun and perspiration reaches level 4~3.

Moisture absorption and moisture conductivity

The cross-section of milk protein fiber is irregular and round. The cross-section is full of gaps and there are many grooves in the longitudinal direction. The protein molecules are distributed in the fiber. The surface contains natural protein moisturizing factors and a large number of hydrophilic groups, which can quickly absorb human sweat.�It is quickly introduced into the air and dispersed through the grooves, keeping people’s skin dry all the time, and the anti-pilling and pilling resistance reaches level 3~4.

Endotherm and release heat

The three-dimensional porous microporous structure of the fiber and the groove structure of the longitudinal surface determine that the fiber has the characteristics of being warm in winter and cool in summer: in summer, it can be made into thin silk fabrics, which can be quickly It absorbs the moisture and sweat emitted by the skin and quickly diffuses it into the air, keeping the skin dry and breathable; it is made of thick fabric in winter, and the micropores absorb the heat emitted by the body, effectively blocking air circulation, preventing the intrusion of cold air, and keeping the skin light and warm.

Other features

Dyeing at normal temperature and pressure, the color is bright, soft and shiny, the dyeing rate is high, the color fastness is level 4~, and the original performance of the product is still maintained after dyeing. It has excellent safety for consumption; it has natural antibacterial function, is more mildew-proof and moth-proof than wool and cashmere, has high strength, is durable in wear and washability, and is easy to store; it dries easily after washing, and the permanent performance of the product can be maintained after washing.

Milk fiber—detection method

① Combustion method: close to the flame: melt and curl; contact with the flame: curl, melt, burn; Leaving the flame: burning, sometimes self-extinguishing; odor when burning: burning hair; characteristics of the residue: black, basically crispy, but with very small amounts of hard lumps. From the above combustion characteristics, it is very similar to protein fibers such as silk.

② Infrared spectrum analysis: From infrared spectrum analysis, we can know that milk fiber contains N-H, -CH3, -C≡N,>C=O and other groups. Milk fiber is extracted from milk. It is made of amino acids grafted with acrylonitrile, but its infrared spectrum is different from natural protein fibers such as silk and wool, and also different from acrylic fiber.

③ Melting point method: There is no melting point below 300℃, the same Linen, cotton and other non-melting point fibers.

④ Slice projection method : Use a Hastings slicer to slice the fiber longitudinally and cross-sectionally, and place it in a 500x projector to observe the results: there are hidden stripes in the longitudinal direction and smooth edges; the cross-section is round, like a synthetic fiber.

Milk fiber —Home textile application

The important raw material for producing milk fiber is milk protein, so it contains seventeen kinds of nutritious amino acids. It also has natural and long-lasting antibacterial functions, and has a broad-spectrum antibacterial rate against Staphylococcus aureus, Candida albicans, fungi, and molds. More than 80% of home textile products have the effect of moisturizing the skin of the human body due to the active protein in the fiber.

Home textile fabrics blended and interwoven with milk protein fiber and other fibers, with fine texture Light, breathable and smooth, the fabric has an elegant and luxurious luster and bright colors.

With milk protein fiber The milk quilt made of velvet filling is docile and soft, has good thermal insulation performance and is elastic. It has the functions of promoting sleep, anti-mite and antibacterial, and beneficial to health. It is especially suitable for people with allergies.

Milk protein fiber home textiles The supplies are easy to store and do not require any special treatment except being careful not to use strong alkaline detergents when washing. Its excellent function can keep it looking like new for a long time with daily use, and it is easy to care for.

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