The initial insulation material was mainly organic materials such as polyphenylene plates. However, organic materials were found to have poor flame resistance. Now the polyphenyl board already has the fireproof effect of Class B2 and B1, and more fireproof and waterproof insulation materials have been launched one after another. It can be seen that the trend of large heat preservation materials is not only towards the direction of more thermal insulation, but also the other Aspects of the factors.
1. Paying more attention to moisture-proof and waterproof performance is an important development direction of thermal insulating materials. The water absorption of the material is an important factor that should be considered when selecting the insulation material. The thermal conductivity of water at room temperature is 23.1 times that of air. Insulation material not only greatly reduces its thermal insulation after absorbing water, but also accelerates the corrosion of metal, which is very harmful. The void structure of the insulation material is divided into several types: connected, closed, and semi-closed. Except for a small number of organic foams, the majority of the voids are closed. The other insulation materials, regardless of the void structure, are water-absorptive, and they are connected with gaps. The capillary penetration of water absorption, so the overall water absorption is high.
At present, most of the insulation and heat insulation materials in China do not drown and have a high water absorption rate. As a result, the waterproof requirements of the outer sheath are very strict, and the cost of the outer sheath is increased. At present, the organosilicon hydrophobizing agent in the modifier is a kind of efficient hydrophobing agent for insulation materials. Its hydrophobic mechanism is the use of organic silicon compounds, and has strong chemical affinity with inorganic silicate materials. To effectively change the surface properties of silicate materials to achieve water repellency. It has good stability, low cost, simple construction process and so on.
2. The use of new nanotechnology thermal insulation materials is also a major research direction. At present, several new types of insulation materials have emerged (such as nanohole insulation materials, asbestos substitutes for composite insulation materials, etc.). Nanoporous insulation materials: With the continuous development of nanotechnology, nanomaterials are increasingly favored by people. Nanoporous silica insulation is a new application of nanotechnology in the field of thermal insulation materials, and most of the pore size in the constituent materials should be on the nanoscale. According to molecular motion and collision theory, the heat transfer of gas is mainly through the higher-speed molecules on the high-temperature side, and the low-speed molecules on the low-temperature side collide with each other to transfer energy.
Since the degree of freedom of nitrogen and oxygen, the main constituents of the air, is about 70 nm, the pore size of the silica particles in the nanoporous siliceous insulation material is smaller than this critical size, and the interior of the material eliminates convection. The heat conduction of the gas molecules is cut off, so that a lower thermal conductivity than non-convection air can be obtained. Development and application of asbestos substitutes: Glass wool is a kind of artificial mineral fiber. Its product has small bulk density, low thermal conductivity, good thermal insulation and sound absorption performance, and corrosion resistance, no mildew, no fear of insects, heat resistance , Frost resistance, shock resistance and good chemical stability. When applied, the construction is convenient and the price is cheap. It is a new type of industrial insulation material. In recent years, the production of glass wool and its products has been a leap forward with the development of socialist construction in our country. The quality of products has been continuously improved and the variety has been increasing. (There are glass wool felts, splicing felts, quilted felts, tube shells and cotton boards, etc. Such as) has been widely applied to petroleum, chemical industry, transportation, vehicle and ship manufacturing, machinery manufacturing, industrial construction and so on.
3, inorganic insulation materials (such as composite silicate insulation materials, etc.) should focus on reducing energy consumption in the production process, limiting the emission of dust and fibers, reducing the amount of binder. Organic insulation materials (such as polystyrene foam insulation, polyurethane foam, etc.) should focus on finding more suitable foaming agents to replace F11; improving the flame retardancy of materials and reducing the production costs of materials.
4. Develop multi-functional composite insulation materials to improve the product's thermal insulation efficiency and expand the product's application surface.
Currently used insulation materials have various degrees of defects in their application: calcium silicate is susceptible to the presence of corrosive calcium oxide in the presence of moisture, and it is difficult to use in low temperature environments because it retains moisture for a long time; Fiber easily absorbs moisture and is not suitable for low temperature environments. It is also not suitable for temperatures above 540°C. Mineral wool also has water absorption properties and should not be used in low temperature environments. It can only be used in high temperature environments where moisture does not exist; polyurethane foam and polyphenylene Ethylene foam should not be used at high temperatures, and it is flammable, shrinks, and produces poisonous gas. Because foam glass is sensitive to thermal shock, it should not be used under conditions of rapid temperature changes. Therefore, in order to overcome the shortage of thermal insulation materials, various countries have developed lightweight materials. Multifunctional composite insulation material.
As a company producing insulation materials, we must grasp the direction of the market and study products that are more in line with market demand in order to obtain the driving force for sustainable development.
1. Paying more attention to moisture-proof and waterproof performance is an important development direction of thermal insulating materials. The water absorption of the material is an important factor that should be considered when selecting the insulation material. The thermal conductivity of water at room temperature is 23.1 times that of air. Insulation material not only greatly reduces its thermal insulation after absorbing water, but also accelerates the corrosion of metal, which is very harmful. The void structure of the insulation material is divided into several types: connected, closed, and semi-closed. Except for a small number of organic foams, the majority of the voids are closed. The other insulation materials, regardless of the void structure, are water-absorptive, and they are connected with gaps. The capillary penetration of water absorption, so the overall water absorption is high.
At present, most of the insulation and heat insulation materials in China do not drown and have a high water absorption rate. As a result, the waterproof requirements of the outer sheath are very strict, and the cost of the outer sheath is increased. At present, the organosilicon hydrophobizing agent in the modifier is a kind of efficient hydrophobing agent for insulation materials. Its hydrophobic mechanism is the use of organic silicon compounds, and has strong chemical affinity with inorganic silicate materials. To effectively change the surface properties of silicate materials to achieve water repellency. It has good stability, low cost, simple construction process and so on.
2. The use of new nanotechnology thermal insulation materials is also a major research direction. At present, several new types of insulation materials have emerged (such as nanohole insulation materials, asbestos substitutes for composite insulation materials, etc.). Nanoporous insulation materials: With the continuous development of nanotechnology, nanomaterials are increasingly favored by people. Nanoporous silica insulation is a new application of nanotechnology in the field of thermal insulation materials, and most of the pore size in the constituent materials should be on the nanoscale. According to molecular motion and collision theory, the heat transfer of gas is mainly through the higher-speed molecules on the high-temperature side, and the low-speed molecules on the low-temperature side collide with each other to transfer energy.
Since the degree of freedom of nitrogen and oxygen, the main constituents of the air, is about 70 nm, the pore size of the silica particles in the nanoporous siliceous insulation material is smaller than this critical size, and the interior of the material eliminates convection. The heat conduction of the gas molecules is cut off, so that a lower thermal conductivity than non-convection air can be obtained. Development and application of asbestos substitutes: Glass wool is a kind of artificial mineral fiber. Its product has small bulk density, low thermal conductivity, good thermal insulation and sound absorption performance, and corrosion resistance, no mildew, no fear of insects, heat resistance , Frost resistance, shock resistance and good chemical stability. When applied, the construction is convenient and the price is cheap. It is a new type of industrial insulation material. In recent years, the production of glass wool and its products has been a leap forward with the development of socialist construction in our country. The quality of products has been continuously improved and the variety has been increasing. (There are glass wool felts, splicing felts, quilted felts, tube shells and cotton boards, etc. Such as) has been widely applied to petroleum, chemical industry, transportation, vehicle and ship manufacturing, machinery manufacturing, industrial construction and so on.
3, inorganic insulation materials (such as composite silicate insulation materials, etc.) should focus on reducing energy consumption in the production process, limiting the emission of dust and fibers, reducing the amount of binder. Organic insulation materials (such as polystyrene foam insulation, polyurethane foam, etc.) should focus on finding more suitable foaming agents to replace F11; improving the flame retardancy of materials and reducing the production costs of materials.
4. Develop multi-functional composite insulation materials to improve the product's thermal insulation efficiency and expand the product's application surface.
Currently used insulation materials have various degrees of defects in their application: calcium silicate is susceptible to the presence of corrosive calcium oxide in the presence of moisture, and it is difficult to use in low temperature environments because it retains moisture for a long time; Fiber easily absorbs moisture and is not suitable for low temperature environments. It is also not suitable for temperatures above 540°C. Mineral wool also has water absorption properties and should not be used in low temperature environments. It can only be used in high temperature environments where moisture does not exist; polyurethane foam and polyphenylene Ethylene foam should not be used at high temperatures, and it is flammable, shrinks, and produces poisonous gas. Because foam glass is sensitive to thermal shock, it should not be used under conditions of rapid temperature changes. Therefore, in order to overcome the shortage of thermal insulation materials, various countries have developed lightweight materials. Multifunctional composite insulation material.
As a company producing insulation materials, we must grasp the direction of the market and study products that are more in line with market demand in order to obtain the driving force for sustainable development.
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