According to the requirements of the “Eleventh Five-Year Plan†of the Chinese Coatings Industry for the Innovation of Science and Technology, the water-based coating of wood coatings in China during the “Eleventh Five-Year Plan†period should reach more than 20%; According to industry authoritative sources, in the next 5 to 8 years, wood coatings will be applied. The water-based will reach more than 50%.
Industrial policies and standards provide protection
On July 1, 2002, the state promulgated the "restrictions on the harmful substances of solvent-borne wood coatings for interior decoration materials" and the "compulsory standards for indoor air quality standards." Since 2005, the state has no longer approved new solvent-based paint production enterprises; In 2005, the state imposed mandatory product certification for solvent-based wood coating companies and promulgated the "Technical Requirements Water-based Coatings for Environmental Labeling Products" to strictly limit the VOC content. In 2006, the government's green procurement list was implemented. After this year's capacity expansion, water-based coatings will be strongly selected. . These industrial policies and standards have provided strong guarantees for the development of waterborne wood coatings. At the same time, the EU REACH regulations will be implemented soon, and China's exports of wood furniture coatings for the EU will be fully water-based.
Healthy environmental protection and energy conservation concept guide development
With the rapid development of China's economy, health and environmental protection have become the main theme of development. Water-based wood coating solvent is water, environmental effects and reduce the health hazards to construction workers. At the same time, the coating consumes large amounts of petroleum resources, such as nitrocellulose used in large-scale production of furniture. The solid content is about 30%. About 70% of the solvent is volatilized during construction, which pollutes the environment and wastes resources. Countries such as Europe and the United States have rarely used volatile wood coatings to paint furniture.
Adequate technology reserves tend to be reasonable
The waterborne wood coatings used in the market are rich in the form of the resin, and they are available in all types. They can meet the requirements for the preparation of waterborne coatings with the same properties as those of solvent-based wood coatings. Defoamers, leveling agents, and wetting agents can improve coating performance. Dyestuffs have been widely used, and the construction process of DIY and furniture industrialized waterborne wood coatings has gradually matured.
With the improvement of technology, many waterborne wood coating materials are used for localization, which reduces the production cost of waterborne wood coatings; in 2006, the prices of chemical raw materials and solvents in the international market increased sharply, which increased the cost of solvent-based coatings, virtually reducing the waterborne The price difference between solvent-based wood coatings.
Construction operability enhances market expansion
Due to the enhanced operability of the construction, some domestic decoration companies have included waterborne wood coatings as part of the promotion plan and trained the corresponding coating teams to avoid the decline in construction quality due to their lack of understanding. Some wood furniture exported to Europe also use water-based wood coatings on a large scale. Enterprises of solvent-based wood coatings originating from South China, East China and Beijing and Tianjin all have technical reserves wishing to enter this market. It can be foreseen that, with the concept of environmental protection being deeply rooted in people's minds, the cost-effectiveness of water-based wood coatings has reached the psychological needs of consumers, and the era of industrialization of waterborne wood coatings is approaching.
It is understood that in 2005 China's production of wood coatings is about 600,000 tons, the output value is not less than 12 billion yuan, and the output value of waterborne wood coatings is about 1 billion yuan, which is less than 10% of the output value of wood coatings; over 700,000 tons of wood coatings in Europe during the same period, Waterborne products exceed 80%. In 2006, the proportion of waterborne wood coatings in China was basically the same as that of the previous year.
Plastic Flowmeter is a widely used instrument in water treatment engineering, mainly used for flow detection, usually installed after the water pump, to control the water intake of each structure, currently the most widely used are electromagnetic flowmeter and ultrasonic flowmeter. In the selection of the flowmeter, the first thing to consider is the corrosiveness of the measured medium to the flow-passing parts, so as to avoid affecting the service life of the flowmeter due to the corrosion of the medium; During the design and installation process of the flowmeter, the length of the straight pipes before and after the flowmeter needs to be considered. Usually, the principle of 5D before and 3D after the flowmeter is followed. Here, D is the inner diameter of the pipe. If the length is insufficient, the measurement accuracy will be affected. When using an ultrasonic flowmeter, the distance between the first 10D and the rear 5D must be met, and the distance from the flowmeter to the water pump must be more than 30D.
When selecting the type, the flow rate of the medium in the pipeline needs to be between the maximum value and the minimum value of the selected flowmeter, and avoid approaching the maximum or minimum value, so as to avoid affecting the measurement accuracy.
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