Milk protein fiber is mainly made from milk. The raw materials are rich in sources, and due to the high-tech process used in the production process, it will not cause pollution to the environment. Therefore, milk protein fiber is well-known A green fiber for the 21st century.
What is milk fiber?
Milk fiber uses milk as the basic raw material. After dehydration, deoiling, defatting, separation and purification, it becomes a casein protein with a linear macromolecular structure; it is then co-produced with polyacrylonitrile using high-tech means. Mixing, cross-linking, and grafting are used to prepare the spinning solution; and then it is formed by wet spinning, solidification, drafting, drying, crimping, shaping, and 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 calculated using electronic Microscopic observation is shown in the figure below. 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 picture that the longitudinal surface of the fiber is not smooth, with irregular grooves and island-like concavities and convexes. These grooves and concavities are caused by the spinning process. During the spinning process, the surface dehydration and orientation of the fiber are formed quickly. Their presence is the main reason why the fiber has good moisture conductivity and excellent moisture absorption and release properties. It 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 and the fiber surface is rough. When used, 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, moisture-conducting, and refreshing;
3) The warmth is close to cashmere and has good warmth retention;
4) The wear resistance, pilling resistance, coloring and strength of milk velvet are better than cashmere;
5) Because milk protein contains amino acids, the skin will not 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 colors – the feel, color and surface remain unchanged after repeated washing. The affinity with dyes makes the colors extra bright and vivid.
Milk fiber – properties
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 The rate is ±4.0%; the linear density variation coefficient is ≤3.5%; the dyeing uniformity (gray card) is ≥3 to 4 levels; the moisture regain rate is 4% to 6%; the fiber antibacterial rate is ≥80%.
Green and environmentally friendly features
No formaldehyde or azo additives or raw materials are used, and the formaldehyde content of the fiber is zero; it is rich in eighteen kinds of amino acids that are beneficial to the human body, which can promote the metabolism of human cells and prevent skin aging and itching. , nourish the skin; it has natural moisturizing factors, so it can maintain the moisture content of the skin, make the skin soft and smooth, and reduce wrinkles. It has broad-spectrum antibacterial function and strong durability. The natural antibacterial function reaches more than 99%, and the antibacterial rate reaches 80%. above.
Fiber comfort
It has a cashmere-like feel. Its single filament has fine fineness and light specific gravity. Its breaking elongation, curl elasticity, and curl recovery rate are close to those of cashmere and wool. The fibers are puffy and soft, and the touch is as soft, comfortable, and smooth as cashmere. ; The fiber is white, with a silky natural luster, elegant appearance, and the fastness to sunlight and perspiration reaches level 4 to 3.
Hygroscopicity
Milk protein fiber has an irregular circular cross-section, which is full of gaps and has many grooves in the longitudinal direction. The protein molecules are distributed on the surface of the fiber and contain natural protein moisturizing factors and a large number of hydrophilic groups, which can be quickly absorbed by the human body. Sweat is quickly introduced into the air through the grooves and dispersed, keeping people’s skin dry all the time. The anti-pilling and pilling resistance reaches level 3 to 4.
Endotherm and release heat
The three-dimensional porous microporous structure of the fiber and the groove structure on the longitudinal surface determine the fiber’s characteristics of being warm in winter and cool in summer: in summer, it is made into a thin silk fabric, which can quickly absorb moisture and sweat emitted by the skin, and quickly spread to the skin. In the air, it keeps the skin dry and breathable; in winter, it is made of thick fabric, with micropores absorbing the heat emitted by the body, effectively blocking air circulation, preventing the intrusion of cold air, and keeping it light and warm.
Other features
Dyeing under normal temperature and pressure, the color is bright, soft and shiny, the dyeing rate is high, the color fastness is level 4~, the original performance of the product is still maintained after dyeing, and it has excellent safety for consumption; it is natural It has 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 the flame: curl, melt, burn; leave the flame: burn, sometimes spontaneously extinguished; odor when burning: smell of burning hair; characteristics of residue: black, basically brittle, but with very small amounts of hard lumps. Judging 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 groups such as N-H, -CH3, -C≡N, >C=O. Milk fiber is amino acids and acrylonitrile extracted from milk. It is grafted, but its infrared spectrum is different from natural protein fibers such as silk and wool, and also different from acrylic;
3) Melting point method: There is no melting point below 300℃, the same as linen, cotton and other non-melting point fibers; 4) Slice projection method: Use a Hastelloy slicer to analyze the fiber Longitudinal and cross-sectional slices were placed in a 500x projector to observe the results: there were hidden stripes in the longitudinal direction and smooth edges; the cross-section was round, like synthetic fibers.
Milk fiber-home textile application
The important raw material for the production of milk fiber is milk protein, so it contains seventeen kinds of nutritious amino acids. It also has natural and long-lasting antibacterial functions, and is widely used against Staphylococcus aureus, Candida albicans, fungi, and molds. Home textile products with a spectrum antibacterial rate of more than 80% have the effect of moisturizing the skin of the human body due to the active protein in the fiber.
It is blended and interwoven with milk protein fiber and other fibers. Home textile fabrics are fine and light in texture, breathable and smooth, with elegant and luxurious luster and bright colors.
The milk quilt made of milk protein fiber velvet as filling is docile and soft, has good thermal insulation performance and is elastic, promotes sleep, and prevents mites Antibacterial, health-promoting function, especially suitable for people with allergies.
Milk protein fiber home textiles 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.
Extended reading: https://www. china-fire-retardant.com/post/9269.html
Extended reading: https://www.alltextile.cn/product/product-15-139.html
Extended reading: https://www.alltextile.cn/product/product-11-389.html
Extended reading:https://www.alltextile.cn/product/product-83-321.html
Extended reading: https://www.china-fire-retardant.com/post/9267.html
Extended reading: https://www.alltextile.cn/product/product-12-965.html
