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8 mau makahiki hana hana

He aha ka Polyvinyl Chloride (PVC), a he aha ia e hoʻohana ai?

ʻO Polyvinyl Chloride (PVC) kekahi o nā polymers thermoplastic i hoʻohana pinepine ʻia ma ka honua (ma kahi aʻe o kekahi mau plastics i hoʻohana nui ʻia e like me PET a me PP). He keʻokeʻo kūlohelohe ia a palupalu hoʻi (ma mua o nā hoʻohui o nā plasticizers) palakiko. Ua ʻoi aku ka lōʻihi o ka lōʻihi o ka PVC ma mua o ka hapanui o nā lula i synthesize mua ʻia ma 1872 a hana ʻia e BF Goodrich Company i nā makahiki 1920. I ka hoʻohālikelike ʻana, hana pinepine ʻia nā plastics maʻamau he nui a lilo i mea hiki ke kūʻai ʻia ma nā 1940s a me 1950s wale nō. Hoʻohana pinepine ʻia ia i ka ʻoihana kūkulu akā hoʻohana ʻia no nā hōʻailona, ​​nā polokalamu olakino, a me kahi fiber no nā lole.

Hana ʻia ʻo PVC i ʻelua mau ʻano laulā, ʻo ka mea mua ma ke ʻano he polymer ʻoʻoleʻa a unplasticized (RPVC a i ʻole uPVC), a ʻo ka lua ma ke ʻano he palolo palolo. ʻOi aku ka maʻalahi a maʻalahi hoʻi o ka PVC maʻalahi a maʻalahi hoʻi i ke kūlou ʻana ma mua o uPVC ma muli o ka hoʻohui o nā plasticizers e like me phthalates (eg diisononyl phthalate a i ʻole DINP). Hoʻohana pinepine ʻia ʻo Flexible PVC i ke kūkulu ʻana ma ke ʻano he insulate ma nā uea uila a i ʻole ka papa hele no nā hale, nā haukapila, nā kula, a me nā wahi ʻē aʻe kahi kahi o ka nohona steril kahi mea nui, a ma kekahi mau hihia ma ke ʻano he pani no ka lākeke.

Hoʻohana pū ʻia ʻo PVC paʻa i ke kūkulu ʻana e like me ka paipu no ka plumbing a no ka ʻaoʻao ʻana e kuhikuhi pinepine ʻia e ka huaʻōlelo "vinyl" ma United States. Hāʻawi pinepine ʻia ka paipu PVC e kāna "papa kuhikuhi" (e laʻa me ka Hōkū 40 a i ʻole Kālā 80). ʻO nā ʻokoʻa nui ma waena o nā papa kuhikuhi nā mea e like me ka mānoanoa o ka paia, ka pālāki ʻana i kaomi, a me ke kala.
ʻO kekahi o nā ʻano mea nui a ka plastic plastic e hoʻokomo i kāna kumukūʻai haʻahaʻa, ke kūpaʻa ʻana i ka hoʻohaʻahaʻa o ke kaiapuni (a me nā kemika a me nā alkalies), paakiki kiʻekiʻe, a me ka ikaika koʻikoʻi koʻikoʻi no kahi lula ma ka hihia o ka PVC ʻoʻoleʻa. Loaʻa ākea ia, hoʻohana pinepine ʻia a maʻalahi hoʻi e hoʻohana hou ʻia (hoʻokaʻawale ʻia e ka helu ʻike resin “3”).


Ka manawa o ka manawa: Feb-02-2021