First, industry conditions
New building materials are produced in the traditional building materials on the basis of a new generation of building materials, mainly including the new wall materials, thermal insulation material, waterproof sealing materials and decoration materials. China's new materials is accompanied by the deepening of reform and opening-up and developed, and from 1979 to 1998, China's an important period of development of new building materials. After 20 years of development, China has basically completed its new building materials industry from scratch, from small to large development process across the country formed a new industry to become an important building material industry product category and a new growth point. The rapid development of economic construction and people's living standard continues to improve, to the development of new building materials provided a good opportunity and a broad market. In 1999 the output value of new building materials is expected to account for the proportion of total output value of building materials industry will be close to 20%. , New building materials are spread all over the country, driven by demand in the market has formed a nationwide organ-type building material distribution networks; the majority of foreign products in China has been able to produce, three-star hotel of new building materials needed to have been able to self-sufficiency in domestic; different grades, different varieties decoration material development, to improve the living conditions of urban and rural people, and change the urban landscape to provide the material guarantee. China has formed a new type of building material research, design, production, construction, distribution team of professionals.Cement Grinding Aids
1, development of new wall materials
Rapid development of new wall materials in China in 1987, production of new wall materials 18.45 billion standard bricks, by 1997 rose to 184.988 billion standard bricks, an increase of 10 times, new wall materials in the total wall materials the proportion rose from 4.58% to 25.2%.
Large variety of new wall materials, mainly including brick, block, board, such as hollow clay brick, clay brick mixed waste, non-clay brick, building blocks, aerated concrete, lightweight panel, composite panel and so on, but the number was smaller , in the decision of the wall material in the base to be still smaller than that. Only new types of material of local conditions to promote the rapid development of wall materials in order to change the irrational product mix to achieve energy-saving, protecting arable land, use of industrial waste residue, the promotion of the purpose of building technology.
After nearly 20 years, I have developed from the first into the foreign production technology and equipment, China's wall materials industry has embarked on the development of more varieties of the road, initially formed the plates of the wall material-based systems, such as concrete hollow block , paper, gypsum board, fiber cement sandwich panels, but the level of wall materials on behalf of a variety of light board, composite panels are still a very small proportion, less than the whole 1% of the total wall materials with the industrialized countries compared with 40-50 years of relatively backward. Following main features: a low grade of products, businesses small scale, backward technology and equipment, and the supporting poor. The slow development of new wall materials, one of the important reasons is the limited strength of solid clay brick is not enough, the lack of specific measures to protect the land resources in order to destroy the land cost of very low cost of manufacture of clay brick, making any kind of new wall materials in the price Can not compete. In 1994 after the implementation of the new system, for brick manufacturing enterprises is only 6% of the value-added tax levied, while the number of new wall materials, especially the lightweight panel have to pay 17% of the value-added tax, adding to the development of new wall materials, unfavorable situation. In view of this situation, the State 3 1 Bureau (Ministry of Construction, Ministry of Agriculture, Land and Resources and the State Building Materials Bureau) Wall Material Innovation Office of the positive guidance to vigorously carry out the work of wall material innovation, combined with the actual situation around, introduced a number of wall materials innovation policy, vigorously promoted the development of new wall materials.
2, thermal insulation materials
Prior to 1980, the development of insulation materials in China is very slow, a small number of thermal insulation material factory can only produce a small amount of expanded perlite, expanded vermiculite, slag wool, ultra-fine glass wool, porous calcium silicate and other products, whether from product variety, size and quality and so can not meet the needs of national construction, as compared with foreign advanced level, at least 30 years behind, for example, 1980 years ago, only three of China's production of slag wool plant capacity of less than 10000 years of peace t, only a single species scattered peace cotton, calcium silicate insulation materials, only three enterprises, annual production capacity of about 8000 cubic meters. Since the reform and opening up, China's thermal insulation materials have made great progress, has developed into a variety of relatively complete, and shape of the thermal insulation material production and technology system. In 1996 the national production of about 80 million tons, of which mineral wool about 20 million tons of glass wool of about 4 million tons, about 50000 foam beans, perlite about 600 million cubic meters (containing about 450,000 tons), other materials 60 thousand tons. Insulation materials in China, compared with the industrialized countries, the main difference is: ① thermal insulation materials in foreign countries are the biggest users of the construction industry, accounting for 80% of output. In China construction market has not yet fully open, its only 10% of output. ② the overall level of production technology and management level, is required to further improve the product quality is not stable enough. ③ inadequate investment in scientific research, applied technology and product development lags behind, especially the insulation material in the construction of the slow progress in applied technology research and development for many years, seriously insulation materials industry's healthy development. Strengthen the new type of thermal insulation materials and other design and construction of new building materials products applications work is the development of new industries a priority to build the village.Sodium Naphthalene Formaldehyde