On June 16, China plastics processing industry association professional committee of plastic pipe in the 2009 annual meeting, through the water supply in PVC pipe is prohibited in declaration of lead salt heat stabilizers, marked the our country in this area a total ban on the use of lead salt thermal stabilizers. It has been more than five years since the ministry of construction, on March 18, 2004, issued a notice concerning the use of non-lead salt heat stabilizers in the same field.

The trend is to ban lead

According to wang zhanjie, secretary general of the special committee of plastic pipes of the China plastic association, polyvinyl chloride has to be added to the heat stabilizer to form. Lead salt thermal stabilizer has great advantages in stability and cost, so it has always been the first choice for PVC processing. However, with the improvement of people's living standards and health requirements, as well as the increasing awareness of global environmental protection, lead pollution has received increasing attention and many areas have begun to implement the ban. The ban of PVC pipe products has also become a trend. The United States, Japan and other developed countries did not use lead salt heat stabilizers in the 1960s; Europe has also set a timetable for the use of lead-salt heat stabilizers: 25% in 2005, 75% in 2010 and 100% in 2015 for the use of lead-salt stabilizers. The European association of plastic, plastic Windows and doors of the association, the association of pipe fitting, metope, etc four organization self-discipline, request the member enterprises in 2015 the use of lead salt heat stabilizers, come to a complete stop. In 2002 Sweden and the Netherlands banned lead salt heat stabilizers for drinking water pipes. In December 2003, the UK banned lead salt heat stabilizers for drinking water pipes.

In the wake of the world's ban on lead, since 2003, our country has been concerned about lead and salt heat stabilizers. According to Song Shuyan, director of the China association of urban water supply and drainage pipeline equipment, Beijing has been tap water into the floor and was found to lead paint, is inferior pipe caused by excessive use of lead salt heat stabilizers. In order to ensure the safety of residents in the city, Beijing and Shanghai have led the decision to ban lead in water pipes. In a statement issued by the ministry of construction in 2004, the application and restriction on the use of technology, issued by the ministry of construction, made clear that the use of non-lead salt thermal stabilizers must be used for the use of PVC pipes. Over the past five years, the majority of PVC pipe production enterprises in China, especially the regulated enterprises have begun to use the thermal stabilizer of non-lead salts. Some enterprises use organic tin thermal stabilizers, and other enterprises use calcium or zinc or rare earth compound heat stabilizers. Polyvinyl chloride thermal stabilizer is developing in the direction of low toxicity, non-toxic, pollution-free, compound and high efficiency.

The lead has remained dead for five years

However, it is more than five years since the use of polyvinyl chloride tubes in water supply has been used to ban lead salt heat stabilizers. The area was once a dead end of lead.

& other; On the one hand, the climate was bad. Throughout the &; In 2004, the price of polyvinyl chloride resin rose sharply, approaching 10,000 yuan per ton, wang recalled. The pressure of production cost of PVC pipe enterprises is not very good, if the total ban of lead at that time, could lead to the overall decline of industry benefit, therefore the association is not clear. Pick & throughout; .

On the other hand, it was difficult to choose what to use instead of lead salt heat stabilizers. There are three alternatives: one is our own domestic rare earth heat stabilizer, but there is also lead. Is another kind of organotin heat stabilizer, but there was no domestic manufacturer production of organic tin heat stabilizer, only by an American company production, particularly worried about foreign manufacturers a card, can give a pipeline industry caused great passive. Another worry is that the formulation and lead salt organic tin system formula, the required equipment and process is different, if all use organotin instead of lead salt, it takes a lot of energy to do technical transformation, not too conforms to China's national conditions. So while the ban was advocated, it was a passive response from the industry association's point of view, and even if it was to be done, it would take a long process. And many companies are not so willing to do it. There is also a calcium and zinc complex stabilizer.

In contrast, calcium and zinc composite thermal stabilizers replace the lead salts without making big changes to the equipment, molds and process conditions, but its price is relatively high. In addition, there are no factories in China to produce calcium and zinc composite thermal stabilizers, only 3 foreign manufacturers are doing it. On the one hand, it will take time to promote the ban on lead and the transformation of industry. As a result, the ban on lead in the ministry of construction has not been well implemented.

The turnaround took place in 2006. The national standard of 1 August of that year was the official implementation of the GB/T10002.1 of PVC (PVC - U) tubing for water supply, and the first definite requirement for the use of polyvinyl chloride pipes for water supply was & ldquo; Production & rdquo of non-lead salt heat stabilizer; . According to this, the special committee of plastic pipes has consciously implemented the ban of lead in member enterprises. In view of the fact that the ban has become a voluntary action of the majority of member companies, since this year, the professional committee of the China plastic association of plastic products has launched a vigorous and comprehensive ban on lead.

Industry supervision is a problem

The current domestic plastic pipe production capacity is about 3 million tons/year, one of the dominant is PVC pipe, the total capacity above 1.5 million tons/year, and most are still in the water.

Zhan-jie wang believes that water supply PVC pipe disabled now lead salt heat stabilizers, the time is right, its mark has two things: one is the Chinese model of the plastic pipe branch at the national related department the lead after the papers, requires member units will no longer lead salt heat stabilizers for PVC water pipes, pipe fittings. This initiative has been widely echoed. More than 90% of member enterprises have voluntarily used non-lead salt heat stabilizers. The second is the impact of the financial crisis. The pipeline industry has been reshuffled. Some small businesses have withdrawn from the market, and the popularization of green pipelines has been feasible.

In an interview with fujian yitong new materials technology co., LTD., the company learned that the company had already been ahead of the lead in the use of PVC pipes. With more than 10 years of experience in the production of polyvinyl chloride pipes, they have developed the non-lead salt water for the development of polyvinyl chloride pipes. & ndash; It has good rigidity and toughness, good quality, good hydraulic performance, long service life and fast construction speed, etc., and fully conforms to the national standard. The product has good social and economic benefits and has a leading domestic product technology.

Hebei bao pegatron pipe co., LTD. Marketing Department staff also said that as early as in 2000, the company is in the industry pioneered the use of organotin heat stabilizer is the lead salt heat stabilizers in the production of green environmental protection PVC water pipe. Compared with lead-salt heat stabilizer, PVC water supply pipe with organic tin thermal stabilizer is used to improve the impact strength of the product and improve the sanitary performance of the product.

But wang has some concerns. And said to him, we have made a quality inspection on the PVC pipe, under the premise that the consent of the member unit, the member unit of product sampling, whose the unqualified product is announced, in order to achieve the purpose of self-discipline. According to the plan worked out in advance, we are in the market to buy products of related companies, led by the association, the organization and the pipe branch of industry quality supervision and inspection agencies and enterprises inspection team composed of representatives of spot check, announced the list of qualified and unqualified. But there is no legal basis for industry associations to take part in law enforcement, and it is awkward to do so. 'there was an appointment, but if the company is going to Sue you, you have to lose,' said a former official at the general administration of quality supervision, inspection and quarantine. So at present, the industry association can only advocate for the promotion of the good, while the bad is not the means.

The reporter noted that in the declaration it was specifically written that the media and users were welcome to monitor. There are also incentives to encourage mutual supervision and prosecution among peers, Mr Wang said. He pointed out that plastic pipe industry to promote the lead business, don't have to find a few typical, but in the case of facts, if you find which member companies are still in the production of PVC pipe with lead, we asked him to quit association.