Comparative Analysis of Various Building Insulation Materials


Release time:

2015-07-21

Author:

New Earth Group

Source:

Comparative Analysis of Various Building Insulation Materials

The use of good insulation technology and materials in construction and industry can often achieve twice the result with half the effort. Statistics show that every ton of mineral wool insulation products, industrial equipment and pipeline insulation, the use of good insulation measures and materials, can significantly reduce production energy consumption and cost, improve the environment, and have better economic benefits. Such as: industrial equipment and piping engineering, good insulation conditions, can reduce the heat loss of about 95%, usually used for insulation materials investment in a year or so can be recovered by saving energy. The development of building insulation materials has been many years of history, a wide variety of major energy-saving insulation materials are compared as follows:
Mineral wool and mineral wool products is a high-quality insulation material, has more than 100 years of production and application history.
In 1840, Britain first discovered that melted slag was blown to form fibers and produce slag wool. In 1880, Germany and Britain began to produce slag wool, which was used and produced in other countries one after another. Large-scale production and application began in the 1930 s. From 1960 to 1980, mineral wool developed most rapidly in all countries in the world. Since 1980, the international output of mineral cotton products has been at a relatively stable stage, the main reason is that the development of other insulation materials such as glass wool and foam plastics is accelerating, and the development speed of developed countries is slowing down. In recent years, the annual output of mineral cotton products in the world is about 8 million tons, and mineral wool is the most widely used in buildings. For example, the United Kingdom accounts for 85%, Germany accounts for 70%, Japan accounts for 92%, and the United States accounts for more than 90%.

In the early 1980 s, Beijing introduced Sweden's 16300-ton production line, and my country's thermal insulation materials have taken a big step forward in the direction of large-scale, better performance, and more complete varieties and specifications. Subsequently, Harbin, Taiyuan, Hohhot, Qiqihar, Urumqi, Dongguan, Yinchuan, Xining, Shanghai and Beijing were successively imported from Sweden, Japan, Australia, Italy, Britain and Poland, and China built a production line in Nanjing. There are 80 production capacity of 3000 tons/year, about 180 production enterprises and 550000 tons of design capacity.

Rock wool production technology: the uniformity of rock wool produced by small factories is poor; The imported equipment automatically adjusts the speed and thickness of cotton cloth, produces more cotton, and the rotating speed of the driving wheel is fast. There is a proportional relationship. Therefore, the bulk density of rock wool in large factories is uniform and the content of slag balls is less.
Glass wool and products after rock wool, a light weight, good thermal insulation performance of thermal insulation materials. Japan produced 205000 tons in 1990, the United States produced 1.925 million tons in 1985 and France produced 115000 tons in 1984. Before the 1980 s, there were only a few small ultra-fine glass wool factories in my country, with a single variety and poor quality. In the mid -1980 s, Shanghai and Beijing introduced Japan-East spinning technology and equipment and used centrifugal blowing to produce products: plates, felts, shells, decorative ceilings, etc.
Features: light weight, generally 10-96kg/m3, felt below 20kg/m3, medium hard board 24-48kg/m3, and hard board 48-96kg/m3, of which 48kg/m3 can be used as ceiling, softening point is about 500°C, heat preservation is 300°C, and the dosage in the United States is large, k = 0.9.
Calcium silicate thermal insulation products were successfully developed in the 1970 s, with high compressive strength, small thermal conductivity, convenient construction, can be used repeatedly, and is widely used in power systems.
At the end of 1994, there were nearly 50 production enterprises in the country, with a total design production capacity of nearly 300000 square meters. At present, only more than 30 enterprises can maintain normal production, with an annual output of about 150000 square meters. Its application has been impacted by mineral wool, coupled with high prices, weak publicity, and poor sales in recent years, which has restricted production.
Application: high temperature resistance, relatively low price, the biggest defect is that it is easy to crack after thermal expansion, and the weld is misaligned; there is space, hot air comes out, and cold air goes in. Although the temperature of the outer protection surface is not high, the heat loss is large.
Aluminosilicate fiber Aluminosilicate fiber, also known as refractory fiber, is mainly used as kiln insulation material. It was successfully developed in China in 1971. At present, there are about 200 production enterprises, with a total production capacity of more than 40000 tons per year and an annual output of nearly 20000 tons. There are many varieties, mainly ordinary aluminum silicate fiber, high purity aluminum silicate fiber, high aluminum fiber and aluminum fiber and a small amount of products, are medium and low-grade products; polycrystalline mullite fiber, polycrystalline alumina fiber and polycrystalline zirconia fiber and other high-grade products.
Most of the domestic production is generally small workshop-style, and then four production lines have been introduced from the United States. The technology is advanced, with instant spinning and dry needle felt, stable quality and temperature resistance of 800-1250°C.
Features: The acidity derivative is more than 2.0, high temperature resistance, and the general chemical pipeline 1000 is more than °C, so this material must be used. The dissolution temperature is around 2000°C.
Foamed plastic is based on synthetic resin, with numerous small holes inside the plastic products, it has a low thermal conductivity, processing molding and other advantages, in the construction has just begun to use. Mainly used in the packaging industry (such as refrigerators), underground buried pipeline insulation, cold storage. The main products are polystyrene foam and polyurethane foam.

Key words: