ʻenehana |He aha nā mea e pili ana i nā waiwai o ka Polyurethane Flexible Foam

No ke aha he nui nā ʻano o nā ʻōhua polyurethane maʻalahi a me nā noi he nui?ʻO kēia ma muli o ke ʻano o ka hana ʻana i nā mea maka, no laila ʻokoʻa nā ʻano o ka polyurethane foam maʻalahi i hana ʻia.A laila, nā mea maka i hoʻohana ʻia no ka flexible polyurethane foams He aha ka hopena o ke ʻano o ka huahana i hoʻopau ʻia?

1. Polyether polyol

Ma ke ʻano he kumu kumu nui no ka hana ʻana i ka ʻūhā polyurethane maʻalahi, hoʻopili ʻia ka polyether polyol me ka isocyanate e hana i ka urethane, ʻo ia ka hopena o ka iwi o nā huahana foam.Inā hoʻonui ʻia ka nui o ka polyether polyol, e hoʻemi ʻia ka nui o nā mea maka (isocyanate, wai a me ka catalyst, etc.), hiki ke maʻalahi i ka haki ʻana a i ʻole ka hāʻule ʻana o nā huahana polyurethane flexible foam.Inā hoʻemi ʻia ka nui o ka polyether polyol, e paʻakikī ka huahana polyurethane foam hiki ke loaʻa a hoʻemi ʻia ka elasticity, a ʻino ka manaʻo o ka lima.

2. Mea ho'ohuehue

ʻO ka mea maʻamau, hoʻohana wale ʻia ka wai (kemika foaming agent) ma ke ʻano he mea hoʻohua i ka hana ʻana i nā poloka polyurethane me ka nui o ka nui ma mua o 21g/cm3, a hoʻohana ʻia nā wahi paila haʻahaʻa e like me ka methylene chloride (MC) i nā ʻano haʻahaʻa haʻahaʻa a i ʻole ultra. - nā ʻano hana palupalu.Hana ʻia nā mea hoʻohui (nā mea puhi kino) ma ke ʻano he mea hoʻoheheʻe kōkua.

Ma keʻano he mea puhi, hoʻopili ka wai me ka isocyanate e hana i nā paʻa urea a hoʻokuʻu i ka nui o CO2 a me ka wela.He hopena hoʻonui kaulahao kēia.ʻOi aku ka nui o ka wai, ʻoi aku ka haʻahaʻa o ka nui o ka pua a ʻoi aku ka ikaika o ka paʻakikī.I ka manawa like, e liʻiliʻi a nāwaliwali nā pou cell, e hōʻemi ana i ka hiki ke hāpai, a hiki ke hāʻule a haki.Eia kekahi, hoʻonui ka hoʻohana ʻana i ka isocyanate, a piʻi ka hoʻokuʻu wela.He mea maʻalahi ke kumu i ke ahi wela.Inā ʻoi aku ka nui o ka wai ma mua o 5.0 mau ʻāpana, pono e hoʻohui ʻia kahi mea hoʻoulu kino kino e hoʻomoʻa i kahi ʻāpana o ka wela a pale i ka wela nui.Ke hoʻemi ʻia ka nui o ka wai, hoʻemi ʻia ka nui o ka catalyst, akā hoʻonui ʻia ka nui o ka polyurethane foam maʻalahi i loaʻa.

kiʻi

E hōʻemi ka mea puhi puhi kōkua i ka nui a me ka paʻakikī o ka polyurethane flexible foam.Ma muli o ka hoʻopili ʻana o ka mea hoʻoheheʻe kōkua i ka ʻāpana o ka wela wela i ka wā o ka gasification, ua lohi ka hoʻōla ʻana, no laila pono e hoʻonui i ka nui o ka catalyst;i ka manawa like, no ka hoʻomoʻa ʻana o ka gasification i kahi ʻāpana o ka wela, pale ʻia ka pilikia o ke ahi ʻana.

3. Toluene diisocyanate

ʻO ka polyurethane flexible foam e koho maʻamau i ka T80, ʻo ia hoʻi, kahi hui o ʻelua isomers o 2,4-TDI a me 2,6-TDI me ka ratio o (80±2)% a me (20±2)%.

Ke kiʻekiʻe loa ka index isocyanate, e paʻa ka ʻili no ka manawa lōʻihi, e hoʻonui ka modulus compressive o ke kino o ka pahu, e paʻakikī ke ʻano o ka ʻoihana, e piʻi ka cell paʻa, e emi ka rebound rate, a i kekahi manawa. e pohā ka huahana.

Inā haʻahaʻa loa ka helu isocyanate, e hoʻemi ʻia ka ikaika mechanical a me ke kūpaʻa ʻana o ka ʻūhā, i mea e maʻa ai ka ʻūhā i nā māwae maikaʻi, e hoʻopiʻi i ka pilikia o ka maikaʻi ʻole o ke kaʻina hana ʻana;Eia kekahi, inā he haʻahaʻa loa ka index isocyanate, e hoʻolilo ʻo ia i ka hoʻonohonoho hoʻoemi o ka polyurethane foam i ʻoi aku ka nui, a ʻo ka ʻili o ka huʻa e ʻike i ka pulu.

4. Hoʻomaka

1. Tertiary amine catalyst: A33 (triethylenediamine solution me ka hapa nui o 33%) ke hoʻohana mau ʻia, a ʻo kāna hana ʻo ia ka hoʻoikaika ʻana i ka hopena o ka isocyanate a me ka wai, hoʻoponopono i ka mānoanoa o ka huʻa a me ka wehe ʻana o ka pahu, etc. ., ka mea nui no ka paipai ʻana i ka huʻihuʻi.

Inā ʻoi aku ka nui o ka nui o ka amine catalyst, e hoʻokaʻawale ia i nā huahana polyurethane foam, a aia nā pores a i ʻole nā ​​pua i loko o ka huʻa;inā he liʻiliʻi loa ka nui o ka amine catalyst, ʻo ka hopena polyurethane foam e emi iho, pani ʻia nā pūnaewele, a e hoʻomāmā i ka lalo o ka huahana.

2. Organometallic catalyst: Hoʻohana maʻamau ʻo T-9 ma ke ʻano he organotin octoate catalyst;ʻO T-9 kahi mea hoʻoheheʻe gel me ka hana catalytic kiʻekiʻe, a ʻo kāna hana nui ka hoʻolaha ʻana i ka hopena gel, ʻo ia hoʻi, ka hopena hope.

Inā hoʻonui ʻia ka nui o ka organotin catalyst, hiki ke loaʻa i kahi pahu polyurethane open-cell maikaʻi.ʻO ka hoʻonui hou ʻana i ka nui o ka organotin catalyst e ʻoi aku ka paʻa o ka huʻa, ka hopena i ka emi ʻana a me nā pūnaewele pani.

ʻO ka hoʻemi ʻana i ka nui o ka amine catalyst a i ʻole ka hoʻonui ʻana i ka nui o ka organotin catalyst hiki ke hoʻonui i ka ikaika o ka pā kiʻiʻoniʻoni polymer bubble ke hana ʻia ka nui o ke kinoea, a laila e hōʻemi i ke ʻano o ka hollowing a i ʻole ka haki ʻana.

ʻO ka polyurethane foam he hale hāmama a pani pani ʻia paha e hilinaʻi nui ʻia i ke kaulike ʻana o ka wikiwiki o ka hopena gel a me ka wikiwiki hoʻonui kinoea i ka wā o ka hoʻokumu ʻana o ka polyurethane foam.Hiki ke hoʻokō ʻia kēia kaulike ma ka hoʻoponopono ʻana i ke ʻano a me ka nui o ka tertiary amine catalyst catalysis a me ka foam stabilization a me nā mea kōkua ʻē aʻe i ka hoʻokumu ʻana.

Hōʻike: Ua haʻi ʻia ka ʻatikala maihttps://mp.weixin.qq.com/s/JYKOaDmRNAXZEr1mO5rrPQ (ka loulou i hoʻopili ʻia).No ka kamaʻilio a me ke aʻo ʻana, mai hana i nā kumu pāʻoihana ʻē aʻe, ʻaʻole ia e hōʻike i nā manaʻo a me nā manaʻo o ka hui, inā pono ʻoe e paʻi hou, e ʻoluʻolu e kelepona i ka mea kākau kumu, inā he hewa, e ʻoluʻolu e kelepona koke iā mākou e hana i ka hana holoi.