He aha nā ʻano o ka Polyvinyl Chloride (PVC)?

ʻO kekahi o nā waiwai koʻikoʻi o ka Polyvinyl Chloride (PVC) penei:

1. Ka nui o ka paʻa:He mānoanoa loa ka PVC i hoʻohālikelike ʻia me ka hapa nui o nā plastics (ʻo ke kaumaha kikoʻī a puni 1.4)
2. Hoʻokele waiwai:Loaʻa maʻalahi ka PVC a he makepono hoʻi.
3. Paʻakikī:He kūlana maikaʻi ko PVC paʻa no ka paʻakikī a me ke kūpaʻa.
4. Ikaika:Loaʻa i ka PVC paʻa ka ikaika tensile maikaʻi loa.

He mea "thermoplastic" (ʻaʻole like me ka "thermoset") ka Polyvinyl Chloride, e pili ana i ke ʻano o ka pane ʻana o ka plastic i ka wela. Lilo nā mea thermoplastic i wai ma ko lākou wahi heheʻe (kahi pae no PVC ma waena o 100 degere Celsius haʻahaʻa loa a me nā waiwai kiʻekiʻe e like me 260 degere Celsius ma muli o nā mea hoʻohui). ʻO kahi ʻano pono nui e pili ana i nā thermoplastics, hiki ke hoʻomehana ʻia i ko lākou wahi heheʻe, hoʻomaʻalili ʻia, a hoʻomehana hou ʻia me ka ʻole o ka hōʻino nui ʻana. Ma kahi o ke kuni ʻana, ʻae nā thermoplastics e like me ka polypropylene liquefy iā lākou e hoʻoheheʻe maʻalahi ʻia a laila hana hou ʻia. I ka hoʻohālikelike ʻana, hiki ke hoʻomehana ʻia nā plastics thermoset i hoʻokahi manawa wale nō (ma ke ʻano maʻamau i ka wā o ke kaʻina hana hoʻoheheʻe injection). ʻO ka hoʻomehana mua ʻana ke kumu o ka hoʻonohonoho ʻana o nā mea thermoset (like me ka epoxy 2-ʻāpana), e hopena ana i kahi loli kemika ʻaʻole hiki ke hoʻohuli ʻia. Inā ʻoe e hoʻāʻo e hoʻomehana i kahi plastic thermoset i kahi mahana kiʻekiʻe i ka lua o ka manawa, e puhi wale ia. ʻO kēia ʻano e hoʻolilo i nā mea thermoset i mau moho maikaʻi ʻole no ka hana hou ʻana.

Hāʻawi ʻo PVC i nā ʻano hana like ʻole a me nā pono ma waena o nā ʻoihana he nui i kona ʻano paʻa a me ke ʻano maʻalahi. ʻO ka mea kūikawā, loaʻa iā Rigid PVC kahi density kiʻekiʻe no ka plastic, e hana ana iā ia i mea paʻakikī loa a ikaika loa. Loaʻa koke nō hoʻi a hoʻokele waiwai, ʻo ia hoʻi, me nā ʻano lōʻihi o ka hapa nui o nā plastics, e lilo ia i koho maʻalahi no nā hana ʻoihana he nui e like me ke kūkulu ʻana.

He ʻano paʻa loa ko PVC a he māmā hoʻi, e lilo ia i mea hoihoi no ke kūkulu ʻana, ka paipu ʻana, a me nā hana ʻoihana ʻē aʻe. Eia kekahi, ʻo kona nui o ka chlorine e pale aku ai i ke ahi, ʻo ia kekahi kumu i kaulana ai ma nā ʻoihana like ʻole.