- D4 (Octamethylcyclotrasiloxane) D4

- D5 (Dekamethylcyclopntasiacane) D5

- D6 (Dodecamethylcyclohexexasiloxane) D6

Kuletsa kwa D4 ndi D5 pazinthu zosamalira payekha:

Octamethylcyclotrasiloxane (D4) ndi dekamethylcyclosiloxane (D5) adawonjezeredwaFikirani mndandanda wa Annex XVII(Lowani 70) ndiCommissity (EU) 2018/35poyamba10 Jan 2018. D4 ndi D5 sadzaikidwa pamsika muzosambitsa zodzikongoletsera zokhala ndi zophatikizira zofanana kapena zazikulu kuposa0.1%kulemera kwa mankhwalawa, pambuyo31 Januware 2020.

Chifukwa chiyani d4 ndi d5 oletsedwa?

D4 ndi D5 ndi cyclosiloxanes makamaka ngati monomers a kupanga Sicone. Amagwiritsanso ntchito mwachindunji pazinthu zosamalira pandekha. D4 yadziwika ngatiwolimbikira, bioictumiritsa ndi poizoni (PBT) ndi chinthu chopitilira muyeso (vpvb). D5 yadziwika ngati VPVB.

Chifukwa cha nkhawa zomwe D4 ndi D5 zitha kukhala ndi kuthekera kuti mudziunjikeKuwunika (seac) kuvomerezedwa ndi malingaliro a UK kuti aletse D4 ndi D5 pakutsuka paumwini pa June 2016 chifukwa amatha kutsika kukhetsa ndikulowa nyanja, mitsinje, ndi nyanja zam'madzi.

Kugwiritsa Ntchito Kugwiritsa Ntchito D4 ndi D5 mu zinthu zina?

Pakadali pano D4 ndi D5 sangolekeredwa mu zinthu zina. ECHA ikugwira ntchito pazowonjezera zowonjezera kuti muchepetse D4 ndi D5 muSiyani pazinthu zachinsinsindi zinaZogulitsa / Zopangira(monga kuyeretsa kouma, mafinya ndi zopukutira, kuchapa ndi kuyeretsa zinthu). Pempholo lidzaperekedwa kuti livomerezedweEpulo 2018. Makampani awonetsa zotsutsa zazikulu za chowonjezera ichi.

MuMarichi 2018, Echa wapanganso kuwonjezera D4 ndi D5 mpaka SVHC.

Kunena:

• Commissity (EU) 2018/35
• Komiti yoyeserera (VEV) ikuvomereza lingaliro kuti aletse d4 ndi d5 kugwiritsa ntchito
• Kusamba Zodzikongoletsera
• Zolinga za kuletsa kwa D4 ndi D5 muzogulitsa zina
• Zoletsa ku Europe

Kodi silika ndi chiyani?

Silicones ndi zinthu zapadera zomwe zimagwiritsidwa ntchito pamagulu mazana omwe amagwiritsa ntchito mwapadera. Amagwiritsidwa ntchito ngati zomatira, amalimbikira, ndipo ali ndi makina abwino kwambiri a makina / owoneka bwino / matenthedwe omwe ali ndi zida zambiri. Amagwiritsidwa ntchito, mwachitsanzo, m'magulu azachipatala, mphamvu zosinthika ndi mphamvu zopulumutsa, komanso matekinolokinoloje a digito, zomanga ndi mayendedwe.

Kodi D4, D5 ndi D6 ndipo amagwiritsidwa ntchito kuti?

Octamethylclotrasiloxane (D4), Denamethylcyccyclopntasiacane (D5) ndi ma dodecamethylcycloanes chisamaliro.

D4, D5 ndi D6 nthawi zambiri amagwiritsidwa ntchito kwambiri monga mankhwala apakatikati, kutanthauza kuti zinthuzo zimagwiritsidwa ntchito pazopanga koma zimangokhala zodetsa zambiri pamapeto.

Kodi SVHC ikutanthauza chiyani?

Svhc imayimira "Cholinga chachikulu kwambiri".

Ndani adapanga chisankho cha SVHC?

Kusankha kwa D4, D5, D5, D5 Monga Svhc adapangidwa ndi Komiti ya ECA yamadzi (MSC), yomwe imapangidwa ndi akatswiri osankhidwa ndi Echa maboma a EU ndi Echa.

Mamembala a MSC adafunsidwa kuti awunikenso za ukadaulo woperekedwa ndi GEMMARY ya D4 ndi D5, komanso ndemanga za D6, komanso ndemanga zomwe zidalandiridwa panthawi yonse.

Chiyambire cha akatswiriwa ndikuwunika ndikutsimikizira kuti sayansi ikuwonetsa malingaliro a SVC, osayesa zomwe zingachitike.

Chifukwa chiyani D4, D5 ndi D6 yolembedwa ngati SVHC?

Kutengera njira zomwe zimagwiritsidwa ntchito, D4 imakwaniritsa njira zolimbikitsira, zinthu zowopsa komanso zowopsa, ndipo DBVB yamphamvu kwambiri.

Kuphatikiza apo, D5 ndi D6 amadziwika kuti PBT akakhala ndi zoposa 0.1% D4.

Izi zidapangitsa kuti kusankhidwa ndi membala wa EU kumndandanda wa SVHC. Komabe, timakhulupirira njira sizimalola kuti umboni wonse wa asayansi uziganizidwe.