Introduction to the application areas of XPS extruded plastic panels

I. Analysis of the development situation

  China's new building materials industry was developed along with the deepening of reform and opening up, and the period from 1979 to 1998 was an important historical period for the development of new building materials in China. After 20 years of development, China's new building materials industry has basically completed the development process from scratch and from small to large, forming an emerging industry in the country, becoming an important product category and a new economic growth point in the building materials industry. The rapid development of economic construction and the continuous improvement of people's living standards have provided good opportunities and a broad market for the development of new building materials.

  It is expected that in 1999 the output value of new building materials will account for nearly 20 percent of the total output value of the building materials industry. At present, the country's new building materials enterprises are scattered all over the country, driven by market demand, has formed a nationwide circulation network of organ newspaper-type building materials; most foreign products China has been able to produce, the new building materials required for three-star hotels domestic has been able to self-supply; different grades, different colour varieties of decorative materials The development of decorative materials of different grades and colours has provided material guarantee for improving the living conditions of people in China's cities and rural areas and changing the appearance of cities. China has formed a new building materials research, design, education, production, construction, circulation of professional teams.

  1, the development of new wall materials

  The development of new wall materials in China is fast, in 1987 the output of new wall materials was 18.45 billion standard bricks, to 1997 grew to 184.988 billion standard bricks, an increase of 10 times, new wall materials in the total proportion of wall materials from 4.58 to 25.2.

  New wall materials are more varieties, mainly including bricks, blocks and boards, such as clay hollow bricks, clay bricks mixed with waste, non-clay bricks, building blocks, aerated concrete, lightweight panels, composite panels, etc., but the number is small, in the stronghold of the decision of the wall materials than it is still small. Only to promote the rapid development of various new body materials in accordance with local conditions, in order to change the unreasonable product structure of wall materials, to achieve energy saving, protection of arable land, the use of industrial waste, to promote the purpose of building technology.

  After nearly 20 years from my research and development of the first into foreign production technology and equipment, China's wall materials industry has begun to embark on the road of multi-species development, the initial formation of a block board-based wall materials system, such as concrete hollow blocks, paper-faced gypsum board, fiber cement sandwich panels, etc., but on behalf of the modern level of wall materials, a variety of light panels, composite panels still account for a small proportion, less than the total volume of wall materials 1, compared with developed industrial countries, relatively 40-50 years behind. Mainly in: low grade products, small-scale enterprises, backward technology and equipment, supporting capacity is poor. One of the important reasons for the slow development of new wall materials is the insufficient restriction on solid clay bricks, the lack of specific measures to protect land resources, the cost of manufacturing clay bricks at the expense of destroying land is extremely low, making any kind of new wall materials can not compete with it in terms of price.

  After the implementation of the new tax system in 1994, only 6 of VAT was levied on clay brick manufacturers, while many new wall materials, especially lightweight panels, had to pay 17 of VAT, exacerbating the unfavourable situation for the development of new wall materials. In response to this situation, the wall material innovation office of the three national ministries and one bureau (Ministry of Construction, Ministry of Agriculture, Ministry of Land and Resources and National Building Materials Bureau) has actively guided all places to vigorously carry out wall material innovation work, combined with the actual situation in each place, and introduced a number of wall reform policies, which has strongly promoted the development of new wall materials.

  2、Insulation materials

  Before 1980, the development of China's insulation materials was very slow, and the few insulation material factories could only produce a small amount of expanded perlite, expanded vermiculite, slag wool, ultra-fine glass wool, microporous calcium silicate and other products, whether from product varieties, specifications or quality, etc. could not meet the needs of national construction, compared with the advanced level abroad, at least 30 years behind, for example, before 1980, the China's slag cotton only 3 production plants, the annual peace capacity of less than 10,000 tons, only peace varieties of a single loose cotton, calcium silicate insulation materials also only 3 enterprises, annual output of about 8000 cubic meters. Since the reform and opening up, China's insulation materials have made great progress, has developed into a relatively complete variety, the initial scale of the production and technology system of insulation materials. 1996 national production of about 800,000 tons, of which about 200,000 tons of mineral rock wool, glass wool about 40,000 tons, foam about 50,000 beans, expanded perlite about 6 million cubic meters (containing about 450,000 tons), 60,000 tons of other materials.

  China's insulation materials compared with industrial developed countries is the main gap: ① insulation materials in foreign countries is the largest user of the construction industry, accounting for about 80. and in China's construction industry market has not been completely opened, its application only accounts for the production of 10. ② the overall level of production process and management level needs to be further improved, product quality is not stable enough. ③ insufficient investment in scientific research, application technology research and product development lags behind, especially the insulation materials in the building application technology research and development for many years of slow progress, seriously affect the healthy development of the insulation materials industry. Strengthen the new insulation materials and other new building materials products design and construction application of work, is the development of new construction village industry of the urgent need.

  From the above situation can be seen, China's insulation material industry after 30 years of efforts, especially after nearly 20 years of high-speed development, many products from nothing to have, from a single to diversified, quality from low to high, has formed to take expanded perlite, mineral wool, glass wool, foam, refractory fiber, calcium silicate insulation products and other major varieties of more complete industry, technology, production equipment level has also had a greater Improve some products have reached the 90s international advanced level. But because China's insulation materials industry is not late, the overall technology and equipment level is low, the application of technology in the field of construction to be improved, to a large extent, the impact of the promotion and application of insulation materials. In recent years, the insulation material industry duplication construction phenomenon is serious, all over the country, hundreds of production lines put into operation in a few years, but not much investment in the development of application areas, resulting in the current low investment efficiency, the supply is greater than the demand situation.

  3, waterproof sealing materials

  Waterproof materials are important functional materials needed for the construction industry and other related industries, is an important part of the building materials industry. With the rapid development of China's national economy, not only industrial buildings and civil construction against materials put forward a variety of high-quality requirements, in bridges, tunnels, national defense, agricultural water conservancy and transportation industries and fields also need high-quality waterproof sealing materials.

  Since the reform and opening up, China's construction of waterproof materials to obtain faster development. Waterproofing materials have gotten rid of the backward situation under the unity of the paper tyre linoleum, currently has a variety of products including asphalt linoleum (including modified asphalt linoleum), synthetic polymer waterproofing rolls, architectural waterproofing coatings, sealing materials, plugging and rigid waterproofing materials, etc. Five categories of products. 1995 new waterproofing rolls production of 42 million square meters, about 5.5 of the production of waterproofing rolls. Product specifications, grade matching, technology and equipment development has taken shape in the waterproofing materials industry system, foreign varieties we basically have.

  According to nine building materials, China's waterproofing materials and advanced foreign countries compared to the following major problems: First, the product structure is unreasonable, the current production and use of new waterproof sealing materials are very small, the paper tire linoleum still accounts for waterproofing membrane 95; Second, the quality of the product is generally low, false Chang products flood the market; Third, the design and construction application technology needs to be improved building leakage is still quite serious. Waterproof materials industry is in urgent need of adjusting the structure, standardize the market.