The European Commission wants to recommend that D4 be included in the United Nations Convention on Persistent Organic Pollutants (POPs). The core issue is that D4 has long-range transport (LRT).
In early March 2016, the European Commission Risk Assessment Group (Rac) and Socio-Economic Analysis Group (Seac) supported the recommendation to include D4 and D5 in REACH . ECHA found that D4 and D5 are persistent, bioaccumulative, toxic, and highly persistent and bioaccumulative in the environment, and meet the conditions for inclusion in Appendix XIII of REACH.
The European Commission proposed D4 certification to fulfill the Annex D standard of the Stockholm Convention. At the November 22-23 meeting, most members agreed that the D4 has long-distance mobility, based on its characteristics and measured data from remote areas.
Once included in the list, it means that the sale or circulation of D4 as a commodity will be hit hard. In addition, the content of the above ring bodies in the silicone rubber polymer system will also be strictly limited. Cost and legal issues will not only severely hit the upstream intermediate companies, but also cause serious consequences to the downstream professional silicone companies that mainly focus on the deep processing of intermediates. Heavy blow. The impact on some industries that use rings as direct applications, such as daily chemicals, may be fundamental. This account will continue to pay attention to the development of the situation and send back reports one after another.
About D4
Octamethylcyclotetrasiloxane (D4), colorless transparent or milky white liquid, flammable, no odor, is a kind of dimethyldichloride The compound obtained by separation and distillation based on the product obtained by hydrolysis and synthesis of silane is an important intermediate in the silicone industry.
The main uses include the preparation of silicone polymers such as methyl silicone oil, insulation and moisture-proofing of radio parts, surface deactivators for gas chromatography glass capillary columns, etc. The primary form of dimethylcyclosiloxane is mainly used for ring-opening polymerization to produce silicone oil, silicone rubber and silicone resin with different degrees of polymerization. These polymers are further processed into products that are widely used in various fields such as construction, electronics, textiles, automobiles, personal care, food, mechanical processing, etc., and there are also a small number of direct applications.
About POPs
Persistent Organic Pollutants (POPs) refer to chemicals that persist in the environment, have a long half-life, and can pass through the food web Organic chemicals that accumulate and cause adverse effects on human health and the environment.
POPs can migrate over long distances through various environmental media (atmosphere, water, organisms, etc.) and exist in the environment for a long time. They have long-term residual properties, bioaccumulation, semi-volatility and high toxicity, and are seriously harmful to human health and the environment. Natural or synthetic organic pollutants.
(Jiangxi New Materials Co., Ltd.)
About SiIn order to add �To manage chemicals and reduce the harm caused by chemicals, especially toxic and hazardous chemicals, the international community has reached a series of multilateral environmental agreements, among which the Stockholm Convention involves relevant provisions on persistent organic pollutants. The international community adopted this Convention in 2001 as a global effort to protect human health and the environment from the hazards of persistent organic pollutants (POPs). The Convention entered into force in 2004 and currently has 124 member states, including China, but currently does not include the United States.
