I kēia manawa, nui nā ʻano maʻamau o nā mea hoʻopaʻa elastic reactive hoʻokahi ma ka mākeke, ʻoi aku ka nui o nā huahana silicone a me polyurethane sealant.He ʻokoʻa nā ʻano mea hoʻopaʻa elastic i kā lākou pūʻulu hana ikaika a hoʻōla i nā hale kaulahao nui.ʻO ka hopena, aia nā palena a ʻoi aʻe a liʻiliʻi paha i kāna mau ʻāpana a me nā kahua pili.Ma ʻaneʻi, hoʻolauna mākou i nā ʻano hana hoʻōla o kekahi mau mea maʻamau hoʻokahi mea hoʻohālikelike elastic sealants a hoʻohālikelike i nā pono a me nā hemahema o nā ʻano mea hoʻopaʻa elastic like ʻole, i mea e hoʻonui ai i ko mākou ʻike a hana i nā koho kūpono i nā noi kūpono.
1. Mea maʻamau hoʻokahi-hui reactive elastic sealant ho'ōla
ʻO nā mea hoʻopaʻa elastic reactive maʻamau hoʻokahi: silicone (SR), polyurethane (PU), silyl-terminated modified polyurethane (SPU), silyl-terminated polyether (MS), ʻO ka prepolymer he mau pūʻulu hana hana like ʻole a me nā ʻano hana hoʻōla ʻokoʻa.
1.1ʻO ka hoʻomaʻamaʻa ʻana o ka silicone elastomer sealant
Kiʻi 1. ʻO ka hana hoʻōla o ka silikon sealant
Ke hoʻohana ʻia nā mea hoʻopaʻa silicone, hana ka prepolymer me ka nui o ka wai ma ka lewa a laila paʻa a vulcanize ma lalo o ka hana a kahi catalyst.He mau mea molekala liʻiliʻi nā huahana.Hōʻike ʻia ke ʻano hana ma ka Figure 1. E like me nā mea molekala liʻiliʻi like ʻole i hoʻokuʻu ʻia i ka wā o ka hoʻōla ʻana, hiki ke hoʻokaʻawale ʻia ka sealant silicone i ke ʻano deacidification, ʻano deketoxime, a me ke ʻano dealcoholization.Ua hōʻuluʻulu ʻia nā mea maikaʻi a me nā pōʻino o kēia mau ʻano kelu silicone ma ka Papa 1.
Papa 1. Hoʻohālikelike i nā pono a me nā pōʻino o kekahi mau ʻano o ka silicone adhesives
1.2 ʻO ka hoʻōla ʻana o ka polyurethane elastic sealant
ʻO ka mea hoʻokahi polyurethane sealant (PU) he ʻano polymer i loaʻa nā ʻāpana urethane hou (-NHCOO-) i ke kaulahao nui o ka mole.ʻO ka hana hoʻōla ʻo ia ka isocyanate e hana me ka wai e hana i kahi carbamate waena paʻa ʻole, a laila e hoʻoheheʻe koke i ka CO2 a me ka amine, a laila hana ka amine me ka isocyanate nui i loko o ka ʻōnaehana, a hoʻokumu i kahi elastomer me kahi ʻōnaehana pūnaewele.Penei kona kumu ho'ōla ho'ōla:
Kiʻi 1. ʻO ka hoʻomaʻamaʻa ʻana i ke ʻano o ka polyurethane sealant
I ka nānā ʻana i kekahi mau hemahema o ka polyurethane sealants, ua hoʻololi hou ʻia ka polyurethane e ka silane e hoʻomākaukau i nā mea hoʻopili, e hana ana i kahi ʻano mea hoʻopili sila hou me kahi kaulahao nui o ka hale polyurethane a me kahi hui hope alkoxysilane, i kapa ʻia ʻo silane-modified polyurethane sealant (SPU).ʻO ka ho'ōla ho'ōla o kēia ʻano mea hoʻopaʻa ua like ia me ka silicone, ʻo ia hoʻi, ʻo nā pūʻulu alkoxy e hana me ka makū e hana i ka hydrolysis a me ka polycondensation e hoʻokumu i kahi ʻano pūnaewele paʻa Si-O-Si ʻekolu-dimensional (Figure 3).ʻO nā ʻāpana hoʻopili pūnaewele a ma waena o nā wahi hoʻopili keʻa he polyurethane flexible section structures.
1.4 ʻO ka hoʻōla ʻana o nā mea hoʻopaʻa polyether i hoʻopau ʻia
silyl-terminated polyether sealant (MS) he mea hoʻokahi elastic adhesive e pili ana i ka hoʻololi silane.Hoʻohui ia i nā mea maikaʻi o ka polyurethane a me ke silicone, he hanauna hou ia o nā huahana sealant adhesive, manuahi ʻole o PVC, ʻaila silicone, isocyanate a me ka solvent.Hoʻopili ʻo MS adhesive me ka wai ma ka lewa ma ka lumi wela, no laila ua hydrolyzed ka polymer silanized me -Si(OR) OR -SIR (OR)- ma ka hope kaulahao a hoʻopili ʻia i loko o kahi elastomer me Si-O- ʻO ka hoʻolālā pūnaewele e hoʻokō i ka hopena sila a me ka hoʻopaʻa ʻana.Penei ke kaʻina hana ho'ōla.
Kiʻi 4. ʻO ka hana hoʻōla ʻana o ka silyl-terminated polyether sealant
2. Hoʻohālikelike i nā pono a me nā hemahema o nā mea hoʻopaʻa elastic reactive maʻamau.
2.1 ʻO nā mea maikaʻi a me nā pōʻino o ka silicone sealants
⑴Pono o ka silicone sealant:
① Kūleʻa maikaʻi i ka wā, ka pale ʻana o ka oxygen, ka pale ozone a me ka pale ultraviolet;② Maikaʻi ka haʻahaʻa haʻahaʻa haʻahaʻa.
⑵Nā hemahema o ka silicone sealant:
① ʻAʻole hiki ke pena ʻia ka hoʻonani hou ʻana;②Ka ikaika haʻahaʻa haʻahaʻa;③ ʻAʻole lawa ka pale ʻana i ka aila;④ʻAʻole kū i ka puncture;⑤Hoʻohua maʻalahi ka papa hoʻopili i ka leachate ʻaila e hoʻohaumia ai i ke kaʻa, pōhaku a me nā substrate ʻē aʻe.
2.2 Nā Pono a me nā pōʻino o nā Polyurethane Sealants
⑴Pono o ka polyurethane sealant:
① Hoʻopili maikaʻi i nā ʻano substrate;② Maikaʻi haʻahaʻa haʻahaʻa;③ ʻO ka elasticity maikaʻi a me nā waiwai hoʻihoʻi maikaʻi loa, kūpono no nā hui ikaika;④ ʻO ka ikaika mechanical kiʻekiʻe, ke kūpaʻa maikaʻi loa, ke kū'ē i kaʻaila a me ke kū'ēʻana o ke ola kino;⑤ ʻO ka hapa nui o nā mea hoʻoheheʻe polyurethane e hoʻomaʻemaʻe i ka wai hoʻokahi, ʻaʻohe solvent a ʻaʻohe haumia i ka substrate a me ke kaiapuni;⑥ Hiki ke pena ʻia ka ʻili o ka sealant a maʻalahi ke hoʻohana.
⑵Nā hemahema o ka polyurethane sealant:
① I ka wā e ho'ōla ai i loko o kahi wela wela a me ka haʻahaʻa haʻahaʻa i kahi wikiwiki wikiwiki, hiki ke hana maʻalahi nā ʻōpala, e pili ana i ka hana o ka sealant;② I ka wā e hoʻopaʻa ai a hoʻopaʻa ʻia nā ʻāpana o nā substrates porous ʻole (e like me ke aniani, metala, a me nā mea ʻē aʻe), pono ke kumu mua;③ Paʻu ʻO ke ʻano kala e maʻalahi i ka ʻelemakule UV, a ʻo ka paʻa o ka mālama ʻana o ke kāpili e hoʻopilikia nui ʻia e ka ʻeke a me nā kūlana o waho;④ ʻAʻole lawa ka pale wela a me ka ʻelemakule.
2.3 ʻO nā pono a me nā pōʻino o nā silane-modified polyurethane sealants
⑴ ʻO nā pono o ka silane i hoʻololi ʻia polyurethane sealant:
① ʻAʻole hoʻopuka ka hoʻōla ʻana i nā ʻōhū;② Loaʻa ka hoʻololi maikaʻi, ke kūpaʻa hydrolysis a me ke kūpaʻa kūpaʻa kino;③ Kūleʻa maikaʻi i ka wā, pale wela, kūpaʻa ʻelemakule, kūpaʻa mālama huahana;④ Hiki ke hoʻololi i nā substrates, i ka wā e hoʻopaʻa ai ʻO ka maʻamau, ʻaʻohe mea e koi ʻia;⑤ Hiki ke pena ʻia ka ʻili.
⑵Nā hemahema o ka silane i hoʻololi ʻia polyurethane sealant:
① ʻAʻole maikaʻi ka pale ʻana o UV e like me ka silicone sealant;② ʻOi aku ka ʻino o ka waimaka ma mua o ka polyurethane sealant.
2.4 ʻO nā pono a me nā pōʻino o nā mea hoʻopaʻa polyether i hoʻopau ʻia
⑴ ʻO nā pono o ka sealant polyether i hoʻopau ʻia i ka silyl:
① Loaʻa iā ia nā waiwai hoʻopaʻa maikaʻi i ka hapa nui o nā substrates a hiki ke hoʻokō i ka hoʻopaʻa ʻana i ka primer-free activation;② ʻOi aku ka maikaʻi o ka pale ʻana i ka wela a me ka pale ʻana o UV ma mua o ka polyurethane maʻamau;③ Hiki ke pena ʻia ma kona ʻili.
⑵Nā hemahema o ka polyether sealant i hoʻopau ʻia i ka silyl:
① ʻAʻole maikaʻi ka pale ʻana i ka wā e like me ke silicone silicone, a ʻike ʻia nā māwae ma ka ʻili ma hope o ka ʻelemakule;② ʻAʻole maikaʻi ka pili ʻana i ke aniani.
Ma o ka hoʻolauna ʻana ma luna nei, ua loaʻa iā mākou kahi ʻike mua o nā mīkini hoʻōla o nā ʻano mea maʻamau o nā mea hoʻopaʻa elastic reactive hoʻokahi, a ma ka hoʻohālikelike ʻana i kā lākou mau pono a me nā hemahema, hiki iā mākou ke hoʻokō i ka ʻike holoʻokoʻa o kēlā me kēia huahana.Ma nā hana kūpono, hiki ke kohoʻia ka sealant e like me nā kūlana noi maoli o ka'āpana hoʻopaʻa no ka hoʻokōʻana i ka sila maikaʻi a iʻole ka hoʻopaʻaʻana o ka māhele noi.
Ka manawa hoʻouna: Nov-15-2023