3.1 Raw material selection Cementing materials: The main inorganic gelling materials, and adding a suitable amount of polymer materials, adjust the viscosity and water retention properties.
Modifier: It is a product modified by organic germanium molecular material. It is mainly used to adjust the easy performance of the product before drying and has the function of increasing the adjustment and water retention.
Natural mineral fiber material: This type of material plays a role in cracking, bending and strengthening the overall strength of thermal insulation materials in composite thermal insulation materials. This product uses palygorskite, sepiolite, aluminum silicate fiber, mineral wool and other fiber materials, under certain conditions, has a good dispersion performance, and the suspension performance is very good, so the processing process is simple.
Expanded perlite: It is a fluffy heat-insulating material formed by heat treatment of perlite minerals. It is often used as aggregate in thermal insulation products. It has a granular granular porous structure with a bulk density of about 50-120 kg/m3 and good insulation. Performance, thermal conductivity of about 0.05WAin.k), ​​for industrial products, stable chemical properties at room temperature, good resistance to temperature and temperature performance, the disadvantage is that it is easy to absorb water.
Phenolic Foam and Waste Polyurethane Foam: We use the solid waste of the current company, mainly phenolic foam and waste polyurethane foam processing molding material left a large amount of scrap and powder, can be used after crushing. The bulk density of the board is 35-80kg/m3, and the thermal conductivity is 0.0219-0.0301W/(mk). The crushed phenolic foam has a lighter weight, non-toxic, non-flammable, non-absorbent, anti-infiltration, non-condensing oil, Anti-solvent and chemical corrosion, with good thermal insulation properties.
3.2 Thermal insulation principle We know that there are three ways of transferring heat: heat conduction, convection and radiation. The main significance of the insulation layer in the structure of building maintenance is to reduce the transfer of heat inside and outside the house. In winter, it is mainly embodied in the heat preservation performance. The heat transfer modes are mainly heat transfer and convection. In summer, heat insulation is the main function, and the heat transfer modes are mainly radiative heat transfer and heat transfer. For buildings, the way to isolate heat is essentially to use the thermal resistance of a closed gas. Under standard conditions, the thermal conductivity of air is. 22W/(nrk).
However, under normal conditions, air molecules move freely and transfer heat through collision. Therefore, in order to achieve the purpose of heat preservation, air molecules must be confined in a tiny space as much as possible. In this way, the collision chance and collision strength of air molecules will be Remarkably weakened, with the reduction of confined spaces, the molecules are less likely to move freely, but hinder the transfer of heat, thereby improving the thermal insulation performance of the material and achieving the desired thermal insulation effect.
As the composite thermal insulation material is waste phenolic foam powder, fly ash, waste polyurethane foam or expanded perlite, etc. as aggregate, it is reinforced with non-metallic minerals such as palygorskite, sepiolite, aluminum silicate fiber or mineral wool. The material, after further processing, is used in the process to further increase the closed porosity and reduce the density. After drying, the product has a porous mesh structure, so that the thermal conductivity of the thermal conductive product is further reduced, and thus has a good thermal insulation effect.
3 The selection of technical key adhesive materials, the ratio of composite heat-insulating materials, the ratio of surface materials, the control of production process parameters of composite heat-insulating materials, crack prevention and layered empty-drum control of composite heat-insulating materials and supporting cover materials.
4. Performance characteristics of composite thermal insulation materials and auxiliary materials Composite thermal insulation materials and auxiliary materials are suitable for roof, wall, boiler pipes and other thermal insulation. The formulas are basically the same, but corresponding adjustments are made to the formula for the characteristics of the use.
The insulation material adopts phenolic resin foam and urethane foam as industrial wastes, and is a kind of heat insulation composition. It is a kind of heat insulation material that combines the current environmental protection, rational use of mineral resources and waste recycling policy. With lightweight, porous, high-strength insulation material, this material has the advantages of strength, high moldability, convenient construction and so on.
Its main performance characteristics are as follows: low thermal conductivity, light weight, suitable for a variety of wall insulation, boiler pipe insulation, when used for wall insulation, occupies a small indoor space, increase the living area, and other types of Compared with the thermal insulation products, the temperature change has almost no effect on its thermal insulation performance, so the thermal insulation effect is good. The product is non-combustible and has good flame retardant properties. Even when the temperature is burning, no smoke is produced; the raw materials for production are all Non-toxic, odorless, non-polluting materials, simple production process, low investment costs; this product can be recycled, no pollution to the surrounding environment; high strength, no cracking, no hollowing, no dust pollution; this product construction process Simple, strong bonding, low overall cost, green products.
Composite insulation materials performance indicators are shown in Table 1.
Composite insulation material performance indicators Table 1 Index Name Unit Standard Index Name Unit Standard Dryness Density Tensile strength Thermal conductivity Cohesive strength Asbestos content Compressive strength Multi-combustible combustion Water ratio Composite insulation materials Surface materials Performance indicators such as Table 2 shows.
M surface materials have performance indicators Table 2 Index Name Unit Standard index Name Unit Standard Initial setting time 60 憎 Water rate Multi 80 Final setting time Operable time Bond strength Crack resistance 24 hours No change Compression strength Flexural strength 5. On the basis of domestic and international production processes and equipment, combined with the characteristics of the material itself, the production technology route has developed a process production line for producing composite thermal insulation materials. The production process flow is shown as follows.
Admixture 1, 2 raw materials 1, Weigh the raw material 4 composite insulation production process. Conclusion According to statistics, the urban and rural construction in China now has a building area of ​​40 billion m2, and the newly-added construction area is nearly 2 billion m2 per year. The high-calorie and high-cold area accounts for 70% of the total national construction, while the urban construction accounts for 50%, which means there is 15 billion m2 of urban buildings need to be energy-saving and insulation. Of this 15 billion V, medium-to-high-end buildings account for 7 billion m2, and low-end buildings reach 8 billion m2. At present, the state has incorporated building energy-saving wall insulation into mandatory regulations for construction projects, in the middle and lower reaches of the Yangtze River and in the cold and cold regions of Beibei. Several billion square meters of buildings are to be insulated in buildings, which provides a broad market for energy-saving insulation products.
The project has now completed a series of preliminary work such as laboratory research, preliminary tests and pilot production pilot tests, product testing, and a small number of project model constructions. The use of industrial waste to prepare lightweight fillers is environmentally friendly. The main raw materials waste phenolic foam and polyurethane foam are industrial wastes. They have certain value for the treatment of wastes in cities in China. At the same time, they turn waste into treasure and protect the environment. The products also provide us with a new idea for how we can rationally use resources and are in line with our resources. The major economic policies for the comprehensive utilization, development of the economy, and protection of the environment are in the right direction. The introduction of products has provided a new solution for China's thermal insulation. At the same time, the product has good compatibility with surface materials after construction, and has low product cost, short construction period, and strong market competitiveness. Compared with commonly used insulation material such as aerated concrete slag, slag, insulation mortar and other materials Enhance the insulation effect, reduce the load, improve the construction performance and other aspects have a great improvement.
The raw materials used in this product are common production materials in China, with excellent performance, convenient construction, and low price. The market prospect is good, and it can produce good economic and social benefits.
Hebei Haiao Wire Mesh Products Co., Ltd. , https://www.haiaowiremeshfencing.com