Material types of external wall thermal insulation materials

We call the material that controls the heat flow out of the room insulation material, which is also commonly used in buildings, so that the indoor temperature can be effectively maintained, for example, it can be warmer in winter. Therefore, it is also very important for us to choose thermal insulation materials. Of course, the better the quality of the material, the better the insulation effect, but there are many kinds of insulation materials, so which one is better? Next, Bian Xiao will introduce us to the types of thermal insulation materials.

1, mineral wool, rock wool and their products

Mineral wool is a cotton-like thermal insulation material made from industrial waste residue by melting, blowing or centrifugation. Rock wool is made of natural rocks such as basalt, diabase and amphibole.

Characteristics of mineral wool: mineral wool and its products are a kind of high-quality thermal insulation material, which has been produced and applied for more than 100 years. It has the advantages of light weight, heat preservation, heat insulation, sound absorption, good chemical stability, incombustibility, corrosion resistance, rich raw materials and low cost.

Main uses of mineral wool: its products are mainly used for heat insulation and sound absorption of walls, roofs and ceilings of dry buildings, and can also be made into waterproof felt and pipe sleeves.

2, glass wool and products

Glass wool is a fibrous material made of glass raw materials or broken glass after melting, including short cotton and superfine cotton.

Characteristics of glass wool: it can maintain good heat insulation performance at high temperature and low temperature; Has good elastic restoring force; It has good sound absorption performance and good sound absorption effect on all kinds of sound waves and noises; Good chemical stability, no aging phenomenon, long-term use performance unchanged, product thickness, density, shape can be processed according to user requirements.

Main uses: short cotton is mainly made into glass wool felt and rolled felt, which is used for building heat insulation and sound insulation, ventilation and air conditioning equipment. Ultra-fine cotton is mainly made of glass wool board and glass wool pipe sleeves. It can be used for thermal insulation of large recording studios, cold storage, warehouses, ships, aviation, tunnels and building construction projects, and can also be used for thermal insulation of heating, water supply, electric power and other equipment and pipelines.

3, aluminum silicate cotton and products

The diameter of aluminum silicate cotton is 3~5? M aluminum silicate fiber, also known as refractory fiber, is an inorganic material made of high-quality flint clay, high-purity alumina, silica and zircon sand. Which is polymerized and fiberized by melt blowing or spinning in a resistance furnace. It is a new high-quality thermal insulation material recognized at home and abroad.

Features: light weight, high temperature resistance, low heat capacity, low thermal conductivity, excellent thermal stability, excellent tensile strength and excellent chemical stability.

Main uses: widely used in high-temperature insulation and sealing of industrial furnaces in electric power, petroleum, metallurgy, building materials, machinery, chemical industry, ceramics and other industrial departments, as well as as as filtering and sound-absorbing materials.

4. Asbestos and its products

Asbestos, also known as "asbestos", is a commercial term, which refers to silicate mineral products with high tensile strength, high flexibility, chemical and thermal corrosion resistance, electrical insulation and spinnability. It is the general name of natural fibrous silicate minerals.

Features: high fire resistance, good electrical insulation and heat insulation. It is an important fireproof, heat-insulating and heat-insulating material.

Main uses: mainly used for dry mechanical transmission, braking, heat preservation, fire prevention, heat insulation, corrosion prevention, sound insulation, insulation and so on. Among them, automobile, chemical industry, electrical equipment, construction and other manufacturing departments are more important.

5. Inorganic microporous materials

(1) Diatomite: Diatomite is composed of amorphous SIO2 _ 2, containing a small amount of fe2o3, CaO, MgO, al2o3 and organic impurities.

Features: Diatomite is usually light yellow or light gray, soft, porous and light, with porosity of 50%~80%, so it has good heat insulation performance. The chemical composition of diatomite is water-containing amorphous silica, and the maximum service temperature can reach 900℃.

Main uses: it is often used as heat preservation material, filter material, filler, grinding material, water glass raw material, decoloring agent and catalyst carrier in industry.

(2) Calcium silicate and its products: Calcium silicate thermal insulation material is a new thermal insulation material made of 65% silica (quartz sand powder, diatomite, etc.). ), 35% without calcium oxide (hydrated lime and carbide slag can also be used. ) and 5% reinforced fiber (such as asbestos, glass fiber, etc. ) is the main raw material, which is made by stirring, heating, gelling, molding, autoclaving and drying.

Features: low apparent density, high flexural strength, low thermal conductivity, high service temperature, good water resistance, strong fire resistance, no corrosion, durable, and its products are easy to process and install.

Main uses: widely used in heat pipes, equipment and kiln insulation materials in dry metallurgy, electric power, chemical industry and other industries. , used as fire-proof covering materials for internal and external walls and flat roofs of buildings, and fire-proof insulation materials for warehouse walls and aisles of various ships.

What I have introduced to you above are some related problems about the types of thermal insulation materials, and you should know something about these materials. There are many kinds of insulation materials, and we know that the insulation effect of each kind of insulation material is different, so we can know more about the various properties of insulation materials when purchasing, which can help us to purchase insulation materials. Some of the types we introduced to you above can also be used as a reference when purchasing.