Parizvino, kune akawanda akajairika marudzi e-single-component reactive elastic sealants pamusika, kunyanya silicone uye polyurethane sealant zvigadzirwa.Mhando dzakasiyana dze elastic sealants dzine misiyano mumapoka avo anoshanda anoshanda uye akarapa makuru cheni zvimiro.Nekuda kweizvozvo, kune zvakawanda kana zvishoma zvinogumira muzvikamu zvayo zvinoshanda neminda.Pano, isu tinosuma nzira dzekurapa dzeakawanda akajairwa chimwe-chimwe chikamu reactive elastic sealants uye kuenzanisa zvakanakira nekuipira kwemhando dzakasiyana dzeelastic sealants, kuitira kudzamisa kunzwisisa kwedu uye kuita sarudzo dzakakodzera mukushandisa zvinoshanda.
1. Common one-component reactive elastic sealant kurapa michina
Common one-component reactive elastic sealants kunyanya zvinosanganisira: silicone (SR), polyurethane (PU), silyl-terminated modified polyurethane (SPU), silyl-terminated polyether (MS),Iyo prepolymer ine akasiyana anoshanda anoshanda mapoka uye akasiyana kurapa maitiro maitiro.
1.1Kurapa nzira yesilicone elastomer sealant
Mufananidzo 1. Kurapa nzira yesilicone sealant
Kana masilicone sealants achishandiswa, iyo prepolymer inobata nekutevera huwandu hwemwando mumhepo uye yobva yaomesa kana kunyungudika pasi pechiito checatalyst.The by-products zvinhu zvidiki zvemamorekuru.Iyo nzira inoratidzwa muMufananidzo 1. Maererano nemhando dzakasiyana-siyana dzema molecular dzakabudiswa panguva yekurapa, silicone sealant inogonawo kugoverwa kuva deacidification type, deketoxime type, uye dealcoholization type.Mabhenefiti uye kuipa kweaya marudzi esilicone glue akapfupikiswa muTafura 1.
Tafura 1.Kuenzanisa kwezvakanaka uye zvisingabatsiri zvemarudzi akawanda e-silicone adhesives.
1.2 Kurapa nzira ye polyurethane elastic sealant
Imwe-chikamu polyurethane sealant (PU) imhando yepolymer ine inodzokorora urethane zvikamu (-NHCOO-) mumaketani makuru emorekuru.Nzira yekurapa ndeyokuti isocyanate inopindirana nemvura kuti igadzire isina kugadzikana yepakati carbamate, iyo inobva yakurumidza kuora kuti ibudise CO2 uye amine, uye ipapo amine inopindirana neisocyanate yakawandisa muhurongwa, uye pakupedzisira inoumba elastomer ine network network.Yayo yekurapa reaction formula ndeiyi inotevera:
Mufananidzo 1.Curing reaction mechanism ye polyurethane sealant
1.3 Kurapa nzira ye silane-modified polyurethane sealant
Mufananidzo 3. Kurapa maitiro ekugadzirisa silane-modified polyurethane sealant
Tichifunga zvimwe zvikanganiso zve polyurethane sealants, polyurethane ichangobva kugadziridzwa ne silane kugadzira adhesives, ichiita rudzi rutsva rwekuisa chisimbiso chine cheni huru ye polyurethane chimiro uye alkoxysilane end group, inonzi silane-modified polyurethane sealant (SPU).Kurapa kwekuita kwerudzi urwu rwechisimbiso kwakafanana nesilicone, kureva kuti, mapoka e-alkoxy anoita nehunyoro kuti awane hydrolysis uye polycondensation kuti aite Si-O-Si matatu-dimensional network yakagadzikana (Mufananidzo 3).Iyo network inoyambuka-inobatanidza mapoinzi uye pakati peiyo muchinjiko-yekubatanidza mapoinzi ndeye polyurethane inochinjika segment zvimiro.
1.4 Kurapa nzira ye silyl-terinated polyether sealants
silyl-terinated polyether sealant (MS) chinhu chimwe chete chinonamira chinonamira chakavakirwa pane silane shanduko.Iyo inosanganisa zvakanakira zvese zviri zviviri polyurethane uye silicone, chizvarwa chitsva cheadhesive sealant zvigadzirwa, isina PVC, silicone mafuta, isocyanate uye solvent.MS inonamira inopindirana nehunyoro huri mumhepo patembiricha yekamuri, kuitira kuti iyo silanized polymer ine -Si(OR) OR -SIR (OR) - chimiro chinoiswa hydrolyze kumagumo echeni uye yakabatanidzwa mu elastomer ine Si-O- Si network chimiro kuti uwane chisimbiso uye bonding mhedzisiro.Iyo yekurapa reaction process ndeiyi inotevera:
Mufananidzo 4. Kurapa nzira ye silyl-terinated polyether sealant
2. Kuenzanisa zvakanakira uye kuipa kwezvakajairwa single-chikamu reactive elastic sealants.
2.1 Zvakanakira uye kuipa kwesilicone sealants
⑴Zvakanakira zvesilicone sealant:
① Yakanakisa kuramba kwemamiriro ekunze, kuramba kweokisijeni, ozone kuramba uye ultraviolet kuramba;② Yakanaka yakaderera tembiricha kuchinjika.
⑵Kuipa kwesilicone sealant:
①Kushongedzwa kwakashata uye haigone kupendwa;②Simba rekubvarura rakaderera;③Kusakwana mafuta kuramba;④Isingadziviriki;⑤Adhesive layer inoburitsa zviri nyore leachate ine mafuta inosvibisa kongiri, dombo uye mamwe akasununguka substrates.
2.2 Zvakanakira uye Zvakaipa zvePolyurethane Sealants
⑴Zvakanakira zve polyurethane sealant:
① Kunamatira kwakanaka kune akasiyana ma substrates;② Yakanakisa yakaderera-yekushisa kuchinjika;③ Yakanaka elasticity uye yakanakisa kudzoreredza zvivakwa, inokodzera majoini ane simba;④ Yakakwirira mechani simba, yakanakisa kupfeka kuramba, mafuta kuramba uye Biological kuchembera kuramba;⑤ Mazhinji-chikamu chimwe-chinoporesa polyurethane sealants hachina kunyungudika uye haana kusvibiswa kune substrate uye nharaunda;⑥ Pamusoro pechisimbiso chinogona kupendwa uye nyore kushandisa.
⑵Zvakashata zve polyurethane sealant:
① Kana uchirapa munzvimbo yepamusoro-yekushisa uye yakakwirira-munyoro pane imwe nguva inokurumidza kukurumidza, mabhuru anogadzirwa nyore nyore, anokanganisa kushanda kwechisimbiso;② Pakusunga uye kuisa chisimbiso zvikamu zveasina porous substrates (segirazi, simbi, nezvimwewo), primer inowanzodiwa;③ Yakadzika Rudzi fomura inotapukirwa nekuchembera kweUV, uye kugadzikana kweglue kunokanganiswa zvakanyanya nekurongedza uye nekunze mamiriro;④ Kupisa kupisa uye kuramba kuchembera hakuna kukwana.
2.3 Zvakanakira uye kuipa kwe silane-yakagadziridzwa polyurethane sealants
⑴Zvakanakira silane yakagadziridzwa polyurethane sealant:
① Kurapa hakuburitse mabhuru;② Iine yakanaka kuchinjika, hydrolysis kuramba uye makemikari kuramba kugadzikana;③ Yakanakisa kuramba kwemamiriro ekunze, kupisa kupisa, kuramba kuchembera, kugadzikana kwekuchengetedza chigadzirwa;④ Wide kuchinjika kune substrates, kana kubatanidza Kazhinji, hapana primer inodiwa;⑤Pamusoro panogona kupendwa.
⑵Zvakashata zve silane yakagadziridzwa polyurethane sealant:
① Kupikisa kweUV hakuna kunaka senge silicone sealant;② Kuramba kubvarura kwakashata zvishoma kupfuura iyo ye polyurethane sealant.
2.4 Zvakanakira uye zvakaipira zve silyl-yakamiswa polyether sealants
⑴Zvakanakira zve silyl-terminated polyether sealant:
① Iyo ine yakanakisa yekubatanidza zvivakwa kune akawanda substrates uye inogona kuwana primer-yemahara activation bonding;② Iine zvirinani kupisa kupisa uye UV kuchembera kuramba kupfuura yakajairwa polyurethane;③ Inogona kupendwa pamusoro payo.
⑵Zvakashata zve silyl-terminated polyether sealant:
① Kuramba kwemamiriro ekunze hakuna kunaka senge silicone silicone, uye kuputika kunoonekwa pamusoro mushure mekukwegura;② Kunamatira kugirazi kwakashata.
Kuburikidza nesumo iri pamusoro, isu tine nzwisiso yekutanga yekurapa maitiro emhando dzinowanzoshandiswa dze single-component reactive elastic sealants, uye nekuenzanisa zvakanakira nekuipira kwavo, tinogona kuwana kunzwisisa kwese kwechigadzirwa chimwe nechimwe.Mukushanda kwekushanda, chisimbiso chinogona kusarudzwa maererano nemamiriro chaiwo ekushandiswa kwechikamu chekubatanidza kuti uwane chisimbiso chakanaka kana kusungirirwa kwechikamu chekushanda.
Nguva yekutumira: Nov-15-2023