Energy conservation, reduction of environmental pollution, reduction of raw material consumption, and improvement of resource utilization are long-term strategic guidelines for China's economic development. Building energy efficiency, as an important part of China's energy conservation work, is an important technical and economic policy in China. Plastic doors and windows are considered to be typical energy-saving products because their energy consumption for production is much lower than that of steel and aluminum alloy doors and windows, and energy saving is 30% to 50%.
Compared with traditional steel and aluminum alloy doors and windows, plastic doors and windows have the following advantages:
1. Significant energy saving
From the viewpoint of production of profile products, the same energy consumption for producing 1 ton of steel profiles is 5 times that for PVC profiles, and the energy consumption for producing 1 ton of aluminum materials is 8 times that of PVC profiles; The thermal conductivity of PVC profiles is 0.14, while steel is 50 and aluminum is 175. In view of this, the thermal conductivity of steel is 357 times that of PVC, and the thermal conductivity of aluminum is 1250 times that of PVC. The doors and windows made of PVC profiles are much smaller than the steel and aluminum doors and windows, and the data provided by the Chinese Academy of Building Sciences provides data. The average heat transfer coefficient of double-glass plastic doors and windows is (2.3w/K) which is 70% of the average heat transfer coefficient (3.3w/m2.k) of single-layer steel aluminum windows, such as 15% of newly-built residential buildings in northern heating areas. Double-glass plastic windows replace general-purpose single-layer or double-layer steel-aluminum windows. Each heating area can save 66,000 tons of standard coal, save 33,000 tons of steel, and save 37,000 tons of standard coal for material production.
2. Water tightness, air tightness, excellent sound insulation.
Profiles for plastic windows are mostly multi-chamber hollow structures, and a small space with multiple air spaces inside has good sound insulation and heat insulation. Window frames, fans and other gaps are equipped with durable sealing strips, which are watertight and airtight.
3. Excellent corrosion resistance
Rigid PVC material is not subject to any acid, alkali, waste gas, salt gas and moisture erosion. New plastic doors and windows are suitable for rainy, humid coastal areas and salt spray and corrosive smoke.
Plastic doors and windows also have many advantages such as light weight, anti-moth-eaten, fire prevention, weather resistance, etc. Plastic doors and windows have been recognized by the public for having so many excellent properties, the country has taken measures to promote the adoption, 1995 Ministry of Construction, Ministry of Chemical Industry Five departments including the China National Light Industry Association, the National Building Materials Bureau, and the Petrochemical Corporation jointly issued the "National Ninth Five-Year Plan for the Promotion of the Use of Chemical Building Materials and the Outline of the 2010 Development Plan" and "On Promotion of the Use of Chemical Building Materials and the Limitation of Eliminating Obsolete Products." Guidelines and other guidance documents suggest that the market share of plastic doors and windows reached at least 30% by 2010. New energy-efficient buildings and existing residential energy-saving projects must use energy-saving windows and use plastic windows as their priority. The introduction of several important documents mentioned above has played a significant role in promoting the development of the plastic door and window industry. The development of plastic doors and windows has been rapid, and its application has been a promising development. By the end of 2001, there were more than 3,000 PVC profile production lines in China, plastic doors and windows. Assembly plant has more than 10,000.
With the rapid development of plastic doors and windows, large and small profile companies have launched, which has brought us new problems, because the production of PVC profiles is a variety of raw materials additives such as: heat stabilizers, lubricants, modified Agents, anti-aging agents, fillers and other powder mixed extrusion processing, most of the SMEs due to raw material preparation technology and equipment equipment is not high, did not use fully automated closed-mixing delivery device, in the preparation of raw materials Dust pollution poses a danger to the surrounding environment and the health of workers. The main hazard in this effect is the stabilizer in raw materials for PVC profiles. The longest history of stabilizers for hard PVC plastics are monomeric lead salt stabilizers, tribasic lead sulfate, and dibasic lead phosphite, which have good thermal stability, excellent weatherability, high insulation, and a wide range of sources. The price is low, many domestic manufacturers are using, but the lead salt stabilizer is a toxic substance, the body after inhalation, the metabolism in the body is accumulated, can stay in the body of various organs and tissues for a long time, have toxic effects on tissues and organs. As the lead salt stabilizers are mostly powdered inorganic salts, there is a problem of dust flying during the production and processing of plastics. If the processing equipment is not advanced enough, the sealing performance is poor, and the degree of automation in plastic processing plants is not high enough. Weighing, artificial feeding, lead salt stabilizer not only poisons the operator, but also seriously pollutes the surrounding environment. Therefore, the use of lead and salt stabilizers to produce plastic steel doors and windows in fact is more harm than good. It seems that plastic doors and windows produced with lead and salt stabilizers are energy-saving products, but they are not environmentally friendly products.
The true connotation of green building materials granted to plastic profiles
To make plastic doors and windows become truly environmentally friendly and energy-saving products, and to give the true meaning of "green materials" for PVC door and window plastic profiles, we must eliminate the use of toxic stabilizers and replace them with non-toxic, non-polluting stabilizers. In fact, developed countries have long recognized this point. Their advanced products generally adopt high-grade and non-toxic routes. The proportion of lead-salt heat stabilizers in PVC plastics processing has been declining year by year. Calcium zinc, organic tins and organic heat are stable. The agent grows exponentially. The United States has now banned the use of lead and salt stabilizers, mainly organic tin stabilizers. Europe plans to phase out toxic lead and salt stabilizers from 2003 to 2005. After China's accession to the WTO, foreign products will have a greater impact on our market, and our products will gradually be combined with world-class products. People's awareness of environmental protection will gradually increase the awareness of green consumption and force us to go through the product process. Take the path of non-toxic, harmless and pollution-free. It is gratifying that in recent years people in China have realized this, many PVC plastic profiles and pipe manufacturers have begun to use a composite stabilizer to replace the monomer lead salt stabilizer, composite stabilizer technology and application development has made gratifying in the past two years Achievements.
Composite technology is being promoted, the product "a pack of", the effectiveness of diversification of dosage forms is obvious. Composite thermal stabilizers are a generic term. Its greatest feature is the chemical compounding of various organic additives and stabilizers to form dust-free, easy-to-measure, high-efficiency, low-toxic or non-toxic compound stabilizers, which can greatly reduce the labor intensity and improve the ingredient environment. , To increase production efficiency and product quality, is a new generation of monomer lead salts and metal soap stabilizers. Compound stabilizers include lead salt stabilizers, calcium zinc stabilizers, and rare earth compound stabilizers. Compound lead salt production technology and product performance are close to the international advanced level, the product has granular, flake. It can solve the problem of dust pollution and measurement difficulties, but it is still a toxic stabilizer, and the high-efficiency Ca-Zn non-toxic compound stabilizer is being further developed. The composite rare-earth stabilizer is a new-style composite stabilizer with Chinese characteristics. It is a non-toxic, odorless, high-efficiency and multi-functional stabilizer. Once it was put on the market, it was well received by many domestic and foreign manufacturers. Monomer lead salt stabilizers in heat stabilizers are ideal alternatives. Is being actively promoted and applied. The rare earth composite stabilizer has the following advantages over other stabilizers:
1. Low-volume and multi-effect, with unique coupling enhancement effect, increase PVC plasticization degree, improve material flowability, and improve product mechanical properties.
2. It is non-toxic and meets the requirements of the current green environment.
3. Absorb UV performance, improve PVC products aging resistance.
4. Convenient and affordable processing, the price of 15,000 yuan / ton, while organic tin stabilizer is a good non-toxic stabilizer, but the price is expensive 45,000 yuan / ton, and the ingredients trouble (liquid).
5. It has brightening effect on PVC products and improves the apparent quality of the products.
The use of rare earth re-stabilization in the production of profile products will not only reduce dust pollution, improve the working environment, reduce the labor intensity of workers, and reduce the harm to operators' personal health, but also increase the quality of products, reduce costs and make plastic doors and windows become real In the sense of energy saving, green building materials products.
