Maviri Component Structural silicone sealants akakwira musimba, anokwanisa kutakura mitoro mikuru, uye anoshingirira kuchembera, kuneta, uye ngura, uye ane kuita kwakagadzikana mukati menguva inotarisirwa kurarama.Izvo zvakakodzera kune zvinonamatira zvinomira kusungirirwa kwezvikamu zvekugadzirisa.Inonyanya kushandiswa pakubatanidza simbi, ceramics, mapurasitiki, rabha, huni uye zvimwe zvinhu zvemhando imwe chete kana pakati pemhando dzakasiyana dzezvigadzirwa, uye inogona kutsiva chikamu mafomu ekubatanidza echinyakare senge welding, riveting uye bolting.
Silicone structural sealant chinhu chakakosha chinoshandiswa mune yakavanzika yakazara kana semi-yakavanzika furemu girazi reketeni madziro.Nekubatanidza mahwendefa nesimbi mapuranga, inogona kumira mitoro yemhepo uye girazi rinorema rinorema, iro rakanangana nekugara uye kuchengeteka kwekuvaka machira emadziro emadziro.Imwe yeakakosha malink egirazi keteni madziro ekuchengetedza.
Icho chisimbiso chechimiro chine mutsara polysiloxane seyakanyanya mbishi zvinhu.Munguva yekurapa, iyo crosslinking agent inobata ne base polymer kuti iite elastic material ine matatu-dimensional network structure.Nekuti iyo Si-O bond simba mu molecular structure yesilicone rabha yakakura mu common chemical bonds (Si- O chaiyo yemuviri uye makemikari zvinhu: urefu hwebhondi 0.164 ± 0.003nm, kupisa kwekuparadzanisa simba 460.5J / mol. (senge polyurethane, acrylic, polysulfide sealant, nezvimwewo), UV kuramba uye kuramba Kugona kuchembera kwemuchadenga kwakasimba, uye hakugone kuchengetedza kutsemuka uye kuparara kwemakore makumi matatu munzvimbo dzakasiyana dzemamiriro ekunze.Iyo ine ± 50% kuramba kune deformation uye kutamiswa munzvimbo yakakura yekupisa.Zvisinei, nekuwedzera kwekushandiswa kwesilicone structural sealants, matambudziko akasiyana-siyana achaonekwa mumashandisirwo anoshanda, akadai se: particle agglomeration uye pulverization yechikamu B, kupatsanurwa uye stratification yechikamu B, compression Indiro haigoni kudzvinyirirwa pasi kana glue iri. yakatenderedzwa, iyo glue inobuda kumhanya yemuchina weglue inononoka, glue pepa butterfly rine zvimedu, nguva yekuomesa pamusoro inokurumidza kana kunonoka, glue rinoita seganda kana vulcanization, uye "ruva glue" rinoonekwa panguva yeglue. kugadzira process.", iyo colloid haigone kurapwa zvakajairika, maoko anonamira mushure memazuva mashoma ekurapa, kuomarara kwacho hakuna kujairika mushure mekurapa, pane tsono-senge pores panzvimbo yekubatanidza ne substrate, mabhuru emhepo akavharirwa musilicone sealant, kusabatana kwakashata. ne substrate, kusawirirana nemidziyo, nezvimwe.
2.FAQ kuongororwa kweVaviri Chikamu Chimiro silicone adhesive
2.1 B chikamu chine particle agglomeration uye pulverization
Kana iyo particle agglomeration uye pulverization yechikamu B ichiitika, pane zvikonzero zviviri: chimwe ndechekuti chiitiko ichi chakaitika muchikamu chepamusoro chisati chashandiswa, izvo zvinokonzerwa nekusaisa chisimbiso kwepakeji, uye muchinjika-inobatanidza mumiririri kana coupling agent mu. chikamu B is Active compound, inobatwa nehunyoro mumhepo, iyi batch inofanira kudzorerwa kumugadziri.Chechipiri ndechekuti muchina unovharwa panguva yekushandiswa, uye iyo particle agglomeration uye pulverization inoitika kana muchina wabatidzwa zvakare, zvichiratidza kuti chisimbiso pakati pepureti yekumanikidza yemuchina weglue uye zvinhu zverabha hazvina kunaka, uye zvishandiso. inofanira kutaurwa kuti dambudziko rigadziriswe.
2.2 Iyo yekumhanyisa yemuchina weglue inononoka
Kana chigadzirwa chikashandiswa kekutanga, iyo glue kubuda kumhanya kwemuchina wegluing inononoka zvakanyanya panguva yegluing maitiro.Pane zvikonzero zvitatu zvinogoneka: ⑴ chikamu A chine kusanaya kwemvura, ⑵ ndiro yekumanikidza yakakura, uye ⑶ kudzvanywa kwemhepo hakuna kukwana.
Kana zvakatemwa kuti ndicho chikonzero chekutanga kana chikonzero chechitatu, tinogona kuzvigadzirisa nekugadzirisa kudzvinyirira kwepfuti yeglue;kana zvichinge zvatemwa kuti ndicho chikonzero chechipiri, kuodha dhiramu ine caliber inoenderana inogona kugadzirisa dambudziko.Kana iyo glue inoburitsa kumhanya ichidzika pasi panguva yakajairwa kushandiswa, zvinogona kunge zviri izvo zvekusanganisa musimboti uye sefa skrini zvakavharwa.Kana yangowanikwa, midziyo inoda kucheneswa nenguva.
2.3 Nguva yekudhonza inokurumidza kana kunonoka
Nguva yekupwanya yeanonamira yezvimiro inoreva nguva inotora kuti colloid ichinje kubva panamira kuenda kune elastic muviri mushure mekusanganiswa, uye kazhinji inoedzwa maminetsi mashanu ega ega.Pane zvinhu zvitatu zvinokanganisa kuomeswa uye kurapwa kwerubha pamusoro: (1) simba rechikamu cheA uye B zvikamu, nezvimwewo;(2) tembiricha uye mwando (pesvedzero tembiricha ndiyo huru);(3) fomula yechigadzirwa pachayo haina kukwana.
Mhinduro kuchikonzero (1) ndeyekugadzirisa reshiyo.Kuwedzera chikamu chechikamu B kunogona kupfupisa nguva yekurapa uye kuita kuti adhesive layer yakaoma uye ine brittle;nepo kudzikisa chikamu cheanorapa mumiririri kuchawedzera nguva yekurapa, iyo yekunamatira layer inova yakapfava, iyo kuoma kunowedzerwa uye simba richawedzerwa.kuderedza.
Kazhinji, huwandu hwehuwandu hwechikamu A:B hunogona kugadziriswa pakati pe(9–13:1).Kana chikamu chechikamu B chakakwira, kukurumidza kwekuita kuchave nekukurumidza uye nguva yekupwanya ichave ipfupi.Kana kuita kwakakurumidza, nguva yekucheka nekumisa pfuti ichakanganiswa.Kana ikanyanya kunonoka, inokanganisa nguva yekuomesa yecolloid.Nguva yekupwanya inowanzogadziriswa pakati pe20 ne60 maminetsi.Kuita kwecolloid mushure mekurapa mune iyi reshiyo renji kwakangofanana.Uye zvakare, kana tembiricha yekuvaka yakanyanyisa kana yakadzikira, tinogona kudzikisa kana kuwedzera chikamu chechikamu B (kurapa mumiririri), kuitira kuti tiwane chinangwa chekugadzirisa kuomeswa kwepasi uye kurapa nguva yecolloid.Kana pane dambudziko nechigadzirwa pachacho, chigadzirwa chinoda kuchinjwa.
2.4 "Ruva guruu" rinowanikwa mukugadzira gluing
Iyo ruva gum inogadzirwa nekuda kwekusaenzana kusanganiswa kwecolloids yeA / B zvikamu, uye inoratidzika seyenzvimbo chena streak.Zvikonzero zvikuru ndezvi: ⑴Pombi yechikamu B yemuchina weglue yakavharwa;⑵Iyo static musanganiswa haina kucheneswa kwenguva yakareba;⑶Chiyero chakasununguka uye iyo glue inobuda kumhanya haina kuenzana;Inogona kugadziriswa nekuchenesa midziyo;nokuda kwechikonzero (3), unoda kutarisa mutongi akaenzana uye kugadzirisa zvakakodzera.
2.5 Kusvuura ganda kana vulcanization yecolloid panguva yekugadzira glue
Kana iyo miviri-yakanamatira inoporeswa zvishoma panguva yekusanganiswa, glue inogadzirwa nepfuti yeglue ichaonekwa ichikanda ganda kana vulcanization.Kana pasina kukanganisa mukupora uye glue-kunze kumhanya, asi glue ichiri crusted kana vulcanized, zvingave kuti midziyo yave yakavharwa kwenguva yakareba, pfuti yeglue haina kucheneswa kana pfuti haisi. yakanyatsocheneswa, uye goko kana guruu rine vulcanized rinoda kugezwa.Kuvaka mushure mekuchenesa.
2.6 Kune mabhuru emhepo mune iyo silicone sealant
Kazhinji, iyo colloid pachayo haina mabhuru emhepo, uye mabhuru emhepo ari mucolloid anogona kunge akasanganiswa nemhepo panguva yekufambisa kana kuvaka, senge: ⑴Eleust haina kucheneswa kana mbiya yerabha yatsiviwa;⑵Midziyo inotsikirirwa pandiro mushure mekuiswa pamushini Isina kudzvanywa pasi, zvichikonzera kuzara kusina kukwana.Naizvozvo, furo rinofanirwa kubviswa zvachose risati rashandiswa, uye muchina weglue unofanirwa kushandiswa nemazvo panguva yekushandiswa kuve nechokwadi chekuisa chisimbiso uye kudzivirira mweya kupinda.
2.7 Kusina kunamatira kune substrate
Sealant haisi yeadhesive yepasirese, saka haigone kuvimbiswa kusungirirwa zvakanaka nese substrates mune inoshanda maapplication.Nekusiyana-siyana kwe substrate pamusoro pekurapa nzira uye maitiro matsva, iyo yekubatanidza kumhanya uye bonding mhedzisiro yezvisimbiso uye substrates zvakare zvakasiyana.
Kune mafomu matatu ekukuvadza kune iyo yekubatanidza interface pakati peiyo dhizaini yekunamatira uye substrate.Imwe kukuvara kwakabatana, ndiko kuti, simba rekubatana > simba rekubatana;imwe yacho kukuvara kwechisungo, ndiko kuti, cohesive force < cohesive force.Nzvimbo yekukuvara kwejunction isingasviki kana yakaenzana ne20% inokodzera, uye nzvimbo yekukuvara kwebhondi inopfuura 20% haina kukodzera;nzvimbo yekukuvara kwebhondi inopfuura 20% chinhu chisingadikanwi mumashandisirwo anoshanda.Panogona kunge paine zvikonzero zvitanhatu zvinotevera nei iyo yekumisikidza inonamira isinganamati kune substrate:
⑴ Iyo substrate pachayo yakaoma kusunga, sePP uye PE.Nekuda kwehupamhi hwemamolecular crystallinity uye kuderera kwepasi tension, havagone kuumba molecular chain diffusion uye kupindirana nezvinhu zvakawanda, saka havagone kuumba chisungo chakasimba painterface.Adhesion;
⑵ Kubatana kwechigadzirwa kwakatetepa, uye kunogona chete kushanda pane mamwe ma substrates;
⑶ nguva yekuchengetedza haina kukwana.Kazhinji, iyo miviri-yakaumbwa inonamatira inofanirwa kurapwa kwemazuva matatu, nepo imwechete-chikamu chinonamira chinofanira kuporeswa kwemazuva manomwe.Kana tembiricha uye hunyoro hwenzvimbo yekurapa zvakaderera, nguva yekurapa inofanira kuwedzerwa.
⑷ Huyero yezvikamu A uye B haina kururama.Paunenge uchishandisa zvigadzirwa zvezvikamu zviviri, mushandisi anofanirwa kunyatso kutevedzera chiyero chinodiwa nemugadziri kuti agadzirise chiyero chebase glue uye anorapa agent, zvikasadaro matambudziko anogona kuitika muchikamu chekutanga chekurapa, kana mune inotevera nhanho yekushandiswa maererano. kunamatira, kuramba mamiriro ekunze uye kusimba.mubvunzo;
⑸ Kutadza kuchenesa substrate sezvinodiwa.Sezvo guruva, tsvina uye tsvina pamusoro peiyo substrate ichadzivisa kusungirirwa, inofanira kucheneswa zvakasimba isati yashandiswa kuti ione kuti chigadziro chekugadzirisa uye substrate yakanyatsobatanidzwa.
⑹ Kutadza kushandisa primer sezvinodiwa.Iyo primer inoshandiswa ku pretreatment pamusoro peiyo aluminiyamu mbiri, iyo inogona kuvandudza kudzivirira kwemvura uye kusimba kwechisungo uku ichipfupisa nguva yekubatanidza.Naizvozvo, mumashandisirwo chaiwo einjiniya, isu tinofanirwa kushandisa primer nemazvo uye nekunyatso dzivirira degumming inokonzerwa nenzira dzisina kunaka dzekushandisa.
2.8 Kusaenderana nemidziyo
Chikonzero chekusapindirana nemidziyo ndechekuti chisimbiso chine chekuita nemuviri kana kemikari ine zvishongedzo zvinosangana, zvichikonzera njodzi dzakadai sekushanduka kwemavara ekunamira, kusanamatira kune substrate, kushatisa kwekuita kweanonamira. , uye kupfupisa hupenyu hwekunamatira kwemaitiro.
3. Mhedziso
Silicone structural adhesive ine simba rakawanda, kugadzikana kwepamusoro, kuchembera kwakanakisa, kuramba tembiricha uye zvimwe zvakanaka zvivakwa, uye inoshandiswa zvakanyanya mukubatana kwekuvaka madziro emaketeni.Zvisinei, mukushandiswa kunoshanda, nekuda kwezvikonzero zvevanhu uye matambudziko ezvinyorwa zvakasarudzwa (zvakatemerwa zvekuvaka hazvigoni kuteverwa zvakasimba), kushanda kwekunamatira kwemaitiro kunokanganiswa zvikuru, uye kunyange kuita kusashanda.Naizvozvo, bvunzo yekuenderana uye yekunamira bvunzo yegirazi, zvigadzirwa zvealuminium uye zvishongedzo zvinofanirwa kutariswa zvisati zvavakwa, uye izvo zvinodikanwa zvechinongedzo chega chega zvinofanirwa kuteedzerwa zvakanyanya panguva yekuvaka, kuitira kuti uwane mhedzisiro yekunamira kwechimiro uye kuve nechokwadi chemhando yepamusoro. chirongwa.
Nguva yekutumira: Nov-30-2022