What can meltblown non-woven fabrics do besides masks
Melt-blown nonwovens are mainly used as composite materials, filter materials, thermal insulation materials, sanitary products, oil-absorbing materials, cleaning cloths (wipes), battery separators, etc. , environmental protection and other fields.
In foreign countries, meltblown nonwovens are mainly used as two-step SMS materials and medical and sanitary materials and covering materials. In addition, wiping and absorbing materials, filtering and barrier materials are also important for meltblown fabrics. use.
1. Medical protective equipment
Because the composite material of meltblown cloth and spunbond cloth has high hydrostatic pressure resistance, good air permeability and filtering effect, especially The material compounded with the membrane has good barrier properties, and the filtration efficiency of non-oily particles can reach more than 99%.
For example, medical protective clothing made of composite materials with a quantitative specification of 60-100g/m2 can effectively block microorganisms, particles and fluids. size of 90nm) has a good protective effect.
2. Materials for air filtration
The melt-blown composite material treated with electrostatic electret has low initial resistance, large dust holding capacity and high filtration efficiency when used for air filtration. [Under the flow rate of 32L/min, the filtration efficiency of 0.3μm particle size can reach 99.9%, and the resistance is only 117.7Pa (12mm water column)] and other characteristics, widely used in electronic manufacturing, food, beverage, chemical industry, airports, hotels Air purification treatment in other places.
Filter devices of various air conditioning equipment, medical high-performance masks, and filter bags of dust collectors can also be made of this material.
3. Materials for liquid filtering
Melt-blown nonwovens can also be used as liquid filtering materials, which can filter particles with a particle size of 0.22 to 10 μm. Such as bacteria, blood and macromolecular substances. Mainly used in the filtration of photoresist in the electronics industry, the filtration of pharmaceutical, biological and synthetic plasma products in the pharmaceutical industry, the filtration of beverages, beer and syrup in the food industry, the fine filtration of electroplating solutions, the filtration of water purification plants, tap water purification filtration, electrolysis Filtration device for hydrogen production from water, environmental wastewater filtration, etc.
PP melt-blown non-woven fabric with hydrophilic properties can be used to make battery separators for mobile phones.
4. Thermal insulation materials
Melt-blown nonwovens have the characteristics of large specific surface area, small voids (pore diameter ≤20μm), and high porosity (≥75%). For example, the specific surface area of u200bu200bmeltblown nonwoven fibers with an average diameter of 3 μm [equivalent to an average linear density of fibers of 0.0638 dtex (denier of 0.058 denier)] reaches 14617 cm2/g, while an average diameter of 15.3 μm [equivalent to the average fiber line The specific surface area of u200bu200bthe spunbonded nonwoven fiber with a density of 1.65 dtex (1.5 dtex)] is only 2883 cm2/g.
Because the thermal conductivity of air is much smaller than that of ordinary fibers, the air in the pores of the meltblown nonwoven makes the thermal conductivity smaller, and the heat loss through the fiber material of the meltblown nonwoven It is very small, and the still air layer on the surface of countless microfibers prevents the heat exchange due to the flow of air, so it has a good heat insulation and warmth effect.
Polypropylene (PP) fiber has the smallest thermal conductivity among the existing fiber materials. After special treatment [such as adding 35% of high-spec (coarse denier) PET three-dimensional crimped fiber], it is made of PP fiber. The thermal insulation performance is 1.5 times that of down and 15 times that of ordinary thermal cotton. Especially suitable for making ski suits, mountaineering suits, bedding, sleeping bags, thermal underwear, gloves and shoes. Quantitative products ranging from 65 to 200 g/m2 have been used to make thermal clothing for soldiers in cold regions.
5. Oil-absorbing material
Because PP fiber has good hydrophobicity and lipophilicity, the density is low (0.91g/cm3), the water absorption rate is low (0.01%), and the moisture regain is 0.05 %, has stable chemical properties such as insoluble in oil and acid and alkali resistance, and is a very good oil absorbing material. The oil absorption of meltblown nonwovens produced from PP raw materials is 15 to 17 times of its own weight, and its water absorption is 0.07 to 1 times of its own weight. It has the characteristics of fast oil absorption, can float on the water surface for a long time after oil absorption, and can be reused. It is the most commonly used oil absorption material at present.
6. Wiping and industrial materials
Melt-blown cloth is also an excellent wiping material, which can be used for cleaning and wiping precision instruments and equipment, and can also be used as a household wiping cloth. In order to prevent the fibers from falling off during use and affecting the use, a low-temperature hot rolling process is often used to increase the surface strength of the melt-blown cloth.
Meltblown cloth is an excellent sound insulation and cushioning material, which is widely used in the fields of construction and automobile manufacturing.
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