Mineral wool and its products are light, durable, incombustible, incorruptible, and moth resistant, and are excellent thermal insulation and sound absorption materials.Cotton like staple fiber made from silicate melt, includingSlag wool、Rock wool、Glass woolandceramic fiber In China, only the first two are generally referred to.The mineral wool first obtained from the Hawaiian crater is called "Farr's hair".Those with metallurgical slag or fly ash as the main raw material are called slag wool;Those who use basalt and other rocks as the main raw materials are called "rock wool".Crush the raw materials into a certain particle size, add additives, etc. for batching, and then melt, cotton and pack them in the furnace.There are three cotton forming processes, namely, jet blowing, centrifugation and centrifugal jet blowing.Mineral wool and adhesive can be made into various mineral wool products through molding, drying, curing and other processes.
Chinese name
Mineral wool
Foreign name
mineral wool
Security description
Incombustibility
Cotton forming process
Injection method, centrifugal method and centrifugal injection method
Features
Light weight, durable, incombustible and incorruptible
When mineral wool is used to prepare raw materials, its acidity coefficient MK value (SiO in weight percentage) is usually controlledtwo+AltwoOthreeAnd MgO+CaO) is 1.2~1.6.When natural rock is used as raw material, appropriate flux shall be added;When metallurgical slag is used, appropriate acid substances are often added.Generally, the cupola with hot blast is used as the melting equipment for rock or slag, or tank furnace, electric furnace, etc.[1]
Cotton forming process
Announce
edit
There are mainly three kinds of injection method, centrifugal method and centrifugal injection method. ①Blowing method.High speed air or superheated steam under certain pressure is used to split and blow the stream of molten material into fibers.According to the relative position of the air stream and the air stream, the vertical blowing method and the horizontal blowing method can be divided. The fiber quality of the former is better than that of the latter. ②Centrifuge method.It is to use mechanical centrifugal force to throw the melt flow unit into fiber, and multi roll centrifuge is often used. ③Centrifugal injection method.The characteristics of centrifugation and injection are integrated.Mineral wool and binder can be mixed in a certain proportion or sprayed with binder during cotton forming, and then processed into various mineral wool products through molding, drying, curing and other processes.Its main varieties are plate (also divided into hard, semi hard and rigid), felt, blanket, cushion, mat, strip, rope and pipe shell, etc.Mineral wool products can be formed by dry, wet or semi dry methods according to their varieties and binders.The binder used is divided into organic matter (such assynthetic resin, starch, asphalt, etc.) and inorganic (such as water glass, bentonite, kaolin, etc.).[1]
Current situation of mineral wool production process
Announce
edit
The mineral wool production process began in the 1930s abroad. At that time, steam injection method was used to blow the melt stream flowing out of the feed outlet with high-speed air flow and draw it into fibers. The fibers were thick, with fiber diameters of more than ten microns. The content of impurities and slag balls was large, and the product quality was poor.After the 1940s, people kept improving on the production process of mineral wool, and successively developed the flat injection method, vertical injection method, disk centrifugal method, roller centrifugal method, etc.In the 1970s and 1980s, the common production process characterized by cupola melting, four roll centrifugal fiber forming and sedimentation cotton gathering was developed and matured internationally.
In China, the common law is still the leading production process equipment.In the 1980s, on the basis of improving the melting and fiber forming mechanism and the technology of collecting cotton with triangular mesh belt and replacing settling cotton with pendulum felt, the pendulum production process was developed internationally.Under the condition that the production consumption is basically the same as that of ordinary process, the pendulum process can produce high-quality products with long and fine fibers, less slag balls, high elasticity, high strength, low density and good hand feeling, and improve the layering of ordinary process mineral wool products.In China, only one rock wool company in Guangdong has adopted the pendulum production process, and its product quality is superior to that of similar domestic products.In the decade of the 1990s, the overall technical level of the production process of the pendulum method in the world has made another leap (the pendulum method that can represent the most advanced international technical level is temporarily called the advanced pendulum method, and the previous production process of the pendulum method is called the primary pendulum method).The high-quality structural cotton produced by the advanced pendulum method will give people a new concept. Its fiber is longer and thinner, the slag ball content is less, and the fiber is three-dimensional distributed, making it have the same thermal insulation effect and the samecompressive strengthUnder the requirement, the volume weight of the product is only 60% of that of the common method product, and the production process of composite plate is simplified, reducing theComposite plateProduction costs.The advanced pendulum method technology can solve the layering problem of existing ordinary mineral wool products, improve their workability and integration with other building materials, which will be easily applied to the construction industry.[1]
performance
Announce
edit
Mineral wool and its products are light, durable, incombustible, incorruptible, mildew free, and moth free. They are excellent thermal insulation and sound absorption materials.The fiber diameter of mineral wool shall not be greater than 9 microns;Slag ball content shall not exceed 10%.The unit weight of raw cotton is 50~100kg/m3, and the unit weight of products is 40~200kg/m depending on the varietythree70~500 kg/m for platethree。The thermal conductivity of mineral wool and products under normal temperature is generally 0.041~0.07 W/(m · K).Use dry methodMineral wool boardAnd felt, which can be used to make composite plates for the interior and exterior walls of buildings, as well as insulationSound insulation material。Wet and semi dry rigid plates can be used as sound absorption materials for ceiling and wall decoration of public and civil buildings.Mineral wool felt, tube and plate can be used as industrial thermal equipment and refrigeration plantinsulation material 。[2]
New applications
Announce
edit
With the attention paid by the state to the requirements of energy conservation and environmental protection, mineral wool, an insulation elder, has played a significant role in the new industry.In the building insulation in full swing, the application of mineral wool is also very popular, especially in recent yearspolystyreneFires in the foam board insulation mode occur from time to timeThermal insulation materialOur choice has always been very important.Mineral wool is used more and more in the building insulation industry because of its heat preservation effect and good non combustibility. Professor Tian Yanfeng, who has been committed to building insulation, said as early as 2000: "The application technology of non combustible insulation materials must be researched and developed in the building energy conservation industry"
There are two main types of mineral wool construction in building energy conservation, one is dry hanging, the other is pasting, and the dry hanging is mainly the glass curtain wall outside the supporting buildingStone curtain wallEtc., filling in the keelThermal insulation material。Paste, imitatePolystyrene boardFor the construction of materials, since the dead weight of mineral wool board is heavier than polystyrene board and its internal strength is slightly poor, several points need to be noted during the construction. First, galvanized mesh must be used for protection, and insulation nails must be used for fixation. For mineral wool products with large dead weight, construction procedures must be considered to avoid deformation caused by excessive dead weight.[2]
