He aha nā kumu o ka melemele ʻana o ka plastik PVC?

He aha nā kumu o ka melemele ʻana o ka plastik PVC?

ʻO ka melemele o nā plastics e pili ana i ke kaulahao o ke kaulahao polymer molecular chain e haki ana ma lalo o ke kiʻekiʻe kiʻekiʻe, oxidizing environment, a i ʻole ma lalo o ka hana o ka ultraviolet, infrared, a me nā microorganisms, e hoʻoulu ai i ka wehe radical manuahi.

ʻO ka melemele maʻamau o nā plastics ka nui o kēia mau mea:

1. ʻO ka hoʻoheheʻe Ultraviolet

ʻO ka mālamalama i hoʻomālamalama ʻia e ka lā i ka papa o waho he spectrum mau me ka nalu o 0.7-3000nm, ʻo ia ka 300-400nm ultraviolet radiation ke kumu nui o ka polymer degradation. A ʻo ka ikehu o nā kiʻi kiʻi ma ka laulā ultraviolet o 290-400nm he 300-419kJ/E, ʻoi aku ka kiʻekiʻe ma mua o ka ikehu paʻa o kekahi mau mea paʻa kemika maʻamau i nā polymers.

2. Ka mana o ka mea hoʻopaʻa wela

Loaʻa nā hopena like ʻole o nā stabilizers wela i ka paʻa māmā o PVC.

Hiki i nā pūhui Ba/Cd a me organotin carboxylate (e like me maleic anhydride ester organotin stabilizers) ke hāʻawi i kekahi degere o ka paʻa o UV i nā kiʻi PVC i hoʻohana ʻia ma waho, ʻoiai nā pūhui organotin i loko o ka sulfur (e like me ka sulfur Alcohol organic tin stabilizers) hāʻawi i ka paʻa māmā. ʻOi aku ka kiʻekiʻe o ka paʻa māmā o ka mea hoʻopaʻa paʻakai di-salt ma mua o ka paʻakai paʻakai tri-paʻakai.

3. Ka hopena o ka ʻōnaehana antioxidant

I kēia manawa, ʻo nā stabilizer i hoʻohana ʻia e nā mea hana profile PVC ka mea nui i nā stabilizers composite. Ma kahi o ka hui nui e hoʻokūpaʻa i ka hoʻohaʻahaʻa ʻana o PVC, hoʻokomo pū lākou i nā ʻōnaehana lubricating, nā ʻōnaehana antioxidant a me nā ʻōnaehana hoʻomaha.

Hiki i ka ʻōnaehana antioxidant ke komo i nā phenolic stabilizers a me phosphite co-stabilizers. Loaʻa paha i kēia mau pūhui nā mea haumia ʻeleʻele maʻalahi, a he mea hou aʻe, hiki ke loaʻa i nā hopena discoloration ma lalo o ka hana o ka māmā, oxygen, a me ka wai.