Accelerate the innovation and development - to develop a new situation of PVC pressure pipe systems

Accelerate the innovation and development - to develop a new situation of PVC pressure pipe systems

1 status of China's PVC piping?? Large, low

1-1 PVC pipe systems in China's development achievements

PVC is the most widely used thermoplastic, one of the current global annual consumption of PVC in 30 million tons, of which about one-third used in pipe fittings [1]. Although there are Other plastic pipe Road competition, since the amount of PVC piping system remains the largest plastic pipe.

China PVC piping system started in the late 50's, but has been in reform and opening up a big gap and international. Began after 80 years the introduction of foreign advanced technology, and gradually establish a PVC-U piping systems a complete system. Plastics piping systems in various PVC pipe system is the first large scale production and application.

Present, China's PVC piping system applications has spread to building water supply, construction drainage, underground water supply, underground drainage, jacket tube, industrial and agricultural areas with a pipe, the amount had more than 1 million tons. China's production of PVC piping systems business is very large, which has formed a group of several million tons of annual output of more than leader, estimated that China's total production capacity of PVC piping nearly 2 million tons. China's quality control standards have been established and preliminary examination system, some leading companies products have been exported to international markets.

1-2 overall domestic PVC pipe systems still lag behind the international advanced level

China PVC piping systems should be fully affirmed the achievements, but also the gaps and problems can not be neglected.

The one hand, the proliferation of fake and shoddy products on the market, severely damaging the credibility of PVC piping system; the other hand, the level of national standards and international standards than there are gaps, insufficient investment in the development of innovation, a long performance enhance and extend the application of little progress.

China PVC piping system, although large-scale, low level is the basic situation. However, insufficient information exchange, the industry often mistakenly believe that PVC piping is PVC-U, now is the international standard product does not appear to be room for innovation and development and improvement of the industry becoming the focus of how to expand the scale and reduce costs.

Mass production of our hard polyvinyl chloride (PVC-U) pressure pipe system is the implementation of national standards for long GB/T10002-1996. The national standard is 'non-equivalent with' international standard ISO4422, but with international standards ISO4422: 1996 is a gap. First, the raw materials do not make long-term hydrostatic strength of performance - the minimum required strength (MRS) the provisions of not less than 25MPa, the required design stress the lack of sufficient basis for the lack of effective long-term life assurance. Second, the national standard does not provide requirements for the fracture toughness while reducing the requirements for impact resistance, so PVC-U pipe for cracking anti-impact performance is not enough monitoring of the risk of damage can not control, can not fully guarantee safe to use. Over the years the country for the PVC-U pressure pipe systems are generally only pay attention to the neglect of strength toughness (resistance to cracking impact resistance), together with the laying of the domestic regulatory environment often do not comply, in fact, China's PVC-U piping system at Accidents are a lot of (mostly brittle cracking, and unfortunately did not see the domestic pressure for PVC-U piping systems in a systematic investigation of the accident).

Years of research and long-term safety performance of plastic pipe, Sichuan University Professor Dong Xiaoli has repeatedly suggested to PVC-U pipe as soon as possible to make up the difference between the standard [2], the domestic PVC pipe industry has a lot of practice from the recognition of the need to reverse only pay attention to strength the expense of toughness of bias. Through the efforts of all aspects of the revised national standards have been promulgated and implemented GB/T10002-2006. The revised standard by greatly improved impact resistance requirements for strength and toughness to emphasize both, apparently will guide our PVC pipe systems in the right direction. However, mass-produced in China should be PVC-U pipe systems up to international advanced level also need hard work. (This article is about the standards, see Annex 1)

PVC pipe production system in China has basically confined to the traditional PVC PVC-U. Many companies do not understand the international trends in PVC pipe technology innovation and progress, do not know through the materials and processing technology innovation can produce than traditional PVC-U better performance, both high strength and high toughness of the pipeline system. In many users the impression that PVC pipe was broken in the fragility of a strike on the pipeline. Although in recent years, leading the production of individual enterprises and research institutions to explore new technologies, including the development of modified polyvinyl chloride PVC-M PVC pipe and biaxial orientation of PVC-O pipes, but so far no substantial market entry. Now see the completion of system development of new products into the trial phase only pipe Co., Ltd. Hebei Baoshuo the 'high impact PVC pipe (PVC-M)' water pipes and Japan produced chemical in China Qingdao PVC Acrylic Copolymer AGR pipe fittings (China has been the industry standard).

In addition, promote the use of PVC piping systems in China can not avoid the question - anti-earthquake performance. PVC pipes industry in China in the investigation has not yet come up with convincing based on the reply. Hydraulic industry in China must pay attention to the water supply pipe network to the application of PVC-U pressure pipe system, there has been concern, mainly because of its anti-seismic performance. China Water Association conference reports and papers have been cited in the urban water supply networks of earthquakes on the damage some of the survey data (such as the Kobe earthquake in PVC pipe was 1.013 damage / km, ductile iron pipe for the 0.135 Office / km) [3]. Therefore, it is not but seriously. China is earthquake-prone areas, according to GB50011-2001 "Seismic Design of Buildings," introduced by the end of 2000, 663 cities in the country, there are 582 seismic fortification requirements (the provisions of 6 degrees or more), accounting for 87.8% of the total city. Therefore, the PVC pipe industry in China must be actively anti-earthquake performance issues, take the initiative to come up with possible solutions and data. In recent years, overseas for the anti-earthquake performance of plastic piping to carry out a lot of research and development of new products and new detection methods, the area where we lag behind the international advanced level.

(In PVC-U pressure pipe systems in the field of non-country and international level also have the same gap. But this will only focus on the pressure control problem.)

2 PVC pipe systems in China's history of development opportunities

Recent changes and developments in the international situation for me

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