From the very beginning, people knew about the isolation of the house from a survival instinct. The first dwellings were some kind of primitive caves, and they used only stones and clay blocks for the necessary insulation. Later, in the era of civilization, people began to use wood, bricks and concrete for building houses. It is a long history of improving people's living conditions. Building insulation is a measure to reduce the heat emitted from the building to the outside and plays an important role in creating a suitable indoor thermal environment and saving energy. In the house, you can achieve the effect of "warm in winter and cool in summer, green and healthy, comfortable and pleasant" through thermal insulation.
So what do you know about the insulation materials used to insulate buildings? Below is a list of eight common insulation materials on the market, and the editor will explore them with you:1. Styrofoam particle rubber powder insulation compound.
Rubber Powder Insulating suspension of EPS particles is composed of organic and inorganic compounds, composed of particles of polyphenylene and other materials, so the thermal conductivity is higher than that of EPS. Since the styrofoam particle rubber powder insulation mortar is used for external wall insulation, it does not impose high requirements on the flatness of the foundation wall, which is conducive to building on foundation walls of various shapes; the construction process is relatively simple and easy to process. exploitation of recycled polymer waste As a light aggregate, benzene particles are useful for environmental protection. However, its building requirements are high, and the insulation effect is not perfect. With the constant improvement of energy saving standards in my country, in some areas it must be used in combination with other insulation materials to match the energy-saving design of the building. requirements.Secondly, rigid polyurethane foam.
Rigid polyurethane foam has attracted the attention of people with its good thermal insulation characteristics. Polyurethane has the advantages of light weight, low thermal conductivity, good temperature resistance, aging resistance, and easy to bond with other substrates. It has been widely used in Europe and the United States. As a wall insulation material, there are three main ways of existence: rigid polyurethane foam spraying, rigid polyurethane foam pouring, and rigid polyurethane foam insulation board. However, the price of polyurethane material is relatively high, and as an organic thermal insulation material, its burning class is B class, which cannot meet the Class A requirements for civil building thermal insulation materials required by Ministry of Public Security Document No. 65.Thirdly, the phenol board.
Phenolic insulation board is made of phenolic foam, the main components of which are phenol and formaldehyde. It is a rigid closed-cell foam made of phenolic resin with foaming agent, hardener and other additives. The degree of combustion of ordinary phenolic foam is B1 (B). In direct contact with a high-temperature open flame, only carburization occurs on its surface without melt dripping. However, the material is prone to oxygen, deformation, poor mortar adhesion, and easy to fall off, has high water absorption, high brittleness, and is easy to break, and the price is relatively high.Four, stone wool (mineral wool).
Mineral wool is an environmentally friendly product made from natural minerals, non-toxic and harmless. It has good fireproof performance, good heat insulation performance and good sound insulation effect. It is widely used in Europe and America. Currently, the problems that exist when using stone wool for wall insulation are low strength, high water absorption, easy shrinkage and cracking. Especially when the material absorbs water and becomes wet, its thermal insulation effect is seriously reduced, so the requirements for the construction process are relatively high.Five foam perlite insulation materials.
In inorganic thermal insulation materials, expanded pearlite particles broadly include open-cell pearlite, closed-cell pearlite, and vitreous microspheres. Due to their porous structure, they are good thermal insulation materials. the thermal conductivity is only 0.038 W (m.K), but in practice they are usually not used by themselves, but are turned into a solid surface of a certain shape by gluing inorganic gel materials. Block products or thermal insulation mortar, due to the high thermal conductivity of inorganic gel materials, thermal insulation performance expanded perlite end products drop sharply, in addition, the high water absorption of the products is also a problem that needs to be addressed for this type of material, although it is sometimes difficult for perlite. Hydrophobic or glassy treatment is used, but in the process of mixing inorganic gel materials, the foam body is inevitably damaged, which makes the hydrophobic treatment invalid and further reduces the thermal insulation performance.Six, foam cement.
The quality of foam cement is poor and its physical properties are unstable. As we all know, the water-cement ratio of concrete mixtures is an important technical indicator. When the water flow rate exceeds the water flow rate per cement hydration reaction, the greater the water flow rate, the lower the strength of the concrete. When water consumption is too high, it also causes defects such as friability and cracks in the concrete. Therefore, during the concrete mixing process, the water consumption should be controlled as much as possible, and if necessary, the method of adding a water-reducing agent should be used to ensure the quality of the concrete. Foamed cement is a type of concrete and water consumption also needs to be controlled. However, in real conditions, the water consumption of some types of foam cement cannot be effectively controlled. Once the water consumption exceeds a certain range, the cement will show obvious precipitation and segregation. Foamed cement has disadvantages such as uneven up and down density, low surface strength, cement slurry layer at the bottom. In addition, too much water will slowly evaporate during the hardening of the cement, and the gaps remaining after evaporation are connected, and not closed gaps, which adversely affects the thermal insulation effect. Therefore, excessive water consumption is extremely harmful to foam cement. However, some construction companies do not realize this. To increase its fluidity and facilitate construction, the water-cement ratio is increased, and this is called "self-leveling". This has led to the fact that the thermal conductivity, density, compressive strength and other important physical indicators of foam cement hardly meet the proper requirements.Seven, expand the vitrified microbeads.
Expanded vitrified microgranules are an inorganic glassy mineral material processed by a multi-stage silicon carbide tubular electric heating production technology. They are irregular spherical particles with a porous structure of cavities inside and a vitrified closed surface, smooth luster, stable physical and chemical properties , light weight, heat insulation, fire protection, high and low temperature resistance, anti-aging, low water absorption and other excellent performance, can replace floating fly ash pellets, vitrified pellets, expanded perlite, polyphenylene particles and many other applications of traditional lightweight aggregates . in different products. However, the water absorption rate is high, there is a certain shrinkage rate, the adhesion degree is low, and the structure is bulky.Eight, YT insulation material.
YT thermal insulation material is an inorganic active thermal insulation material, which can only be called a thermal insulation system by adding water and stirring it on the wall. System fire protection class A1, non-flammable, no need anduse anti-crack mortar, plaster mortar, mesh cloth (steel mesh) and other materials and processes, whether painting or brick finishing, to achieve heat preservation. , heat insulation and fire protection at the same time, water proof, anti-crack, wall smoothing, whitening function. It can be used for exterior wall insulation or composite insulation for interior and exterior walls. It can replace the wall plaster layer when performing internal wall insulation. The construction process is simple, ordinary masons can build after receiving the technical guidance, the construction period can be reduced by more than 50%, and the construction cost is low.
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