Iisealant ezimbini ze-silicone zesakhiwo zinamandla aphezulu, ziyakwazi ukuthwala imithwalo emikhulu, kwaye ziyamelana nokwaluphala, ukudinwa, kunye nokugqwala, kwaye zisebenza ngokuzinzileyo kwixesha elide elilindelekileyo. Zifanelekile kwiiglu ezimelana nokubotshelelwa kweendawo zesakhiwo. Isetyenziswa kakhulu kwi-bonding metal, ceramics, plastics, rabha, umthi kunye nezinye izinto zohlobo olufanayo okanye phakathi kweentlobo ezahlukeneyo zezinto, kwaye zinokuthatha indawo yeentlobo zoqhagamshelo zendabuko ezifana nokuwelda, ukugoba kunye nokubolisa.
I-silicone structural sealant sisixhobo esibalulekileyo esisetyenziswa kwiindonga zeglasi ezifihliweyo ngokupheleleyo okanye ezifihlwe kancinci. Ngokudibanisa iipleyiti kunye neefreyimu zesinyithi, inokumelana nemithwalo yomoya kunye nemithwalo yeglasi yobunzima bomzimba, enxulumene ngokuthe ngqo nokuqina kunye nokhuseleko lwezakhiwo zodonga lwekhethini. Elinye lamakhonkco aphambili okhuseleko lwedonga lwekhethini yeglasi.
Sisitywina solwakhiwo esine-polysiloxane ethe tye njengezinto eziphambili eziluhlaza. Ngexesha lenkqubo yokuphilisa, i-arhente yokudibanisa isabela kunye ne-polymer esisiseko ukuze yenze izinto ezithambileyo ezinesakhiwo senethiwekhi esinemilinganiselo emithathu. Ngenxa yokuba amandla e-Si-O bond kwisakhiwo se-molecular yerabha ye-silicone makhulu kakhulu kwiibhondi zekhemikhali ezifanayo (iipropati ezithile ze-Si-O zomzimba nezekhemikhali: ubude bebhondi yi-0.164±0.003nm, amandla okwahlukana kobushushu yi-460.5J/mol. Iphezulu kakhulu kune-C-O358J/mol, C-C304J/mol, Si-C318.2J/mol), xa kuthelekiswa nezinye izitywina (ezifana ne-polyurethane, i-acrylic, i-polysulfide sealant, njl.njl.), ukumelana ne-UV kunye nokumelana Amandla okuguga emoyeni anamandla, kwaye ayinakugcina iintanda kunye nokonakala kangangeminyaka engama-30 kwiindawo ezahlukeneyo zemozulu. Inokumelana ne-±50% kwi-deformation kunye ne-displacement kuluhlu olubanzi lobushushu. Nangona kunjalo, ngokwanda kokusetyenziswa kwe-silicone structural sealants, kuza kuvela iingxaki ezahlukeneyo kwizicelo ezisebenzayo, ezinje: ukuhlanganiswa kwamasuntswana kunye nokucolwa kwe-component B, ukwahlulwahlulwa kunye nokwahlulwa kwe-component B, ukucinezelwa. Ipleyiti ayinakucinezelwa okanye iglu ijikwe, isantya sokukhupha iglu yomatshini weglue sicotha, iglu yephepha lebhabhathane inamasuntswana, ixesha lokomisa umphezulu likhawuleza kakhulu okanye licotha kakhulu, iglu ibonakala ikhuba okanye ivulcanization, kwaye "iglu yentyatyambo" ivela ngexesha lenkqubo yokwenza iglue. ", i-colloid ayinakuphiliswa ngokuqhelekileyo, izandla ezinamathelayo emva kweentsuku ezimbalwa zokucocwa, ubunzima abuqhelekanga emva kokucocwa, kukho iimbobo ezifana neenaliti kumphezulu wokubophelela kunye ne-substrate, amaqamza omoya abanjwe kwi-silicone sealant, ukubophelela okungahambi kakuhle ne-substrate, ukungahambelani nezixhobo, njl.
2. Uhlalutyo lwemibuzo ebuzwa rhoqo lwe-Two Component Structure silicone adhesive
2.1 Inxalenye ye-B ine-particle agglomeration kunye ne-pulverization
Ukuba i-particle agglomeration kunye ne-pulverization ye-component B iyenzeka, kukho izizathu ezibini: esinye kukuba le nto yenzekile kumaleko ongaphezulu ngaphambi kokusetyenziswa, okubangelwa kukungatywinwa kakuhle kwephakheji, kwaye i-arhente yokudibanisa okanye i-agent yokudibanisa kwi-component B yi-Active compound, echaphazeleka lula kukufuma emoyeni, le batch kufuneka ibuyiselwe kumenzi. Esesibini kukuba umatshini uyacinywa ngexesha lokusetyenziswa, kwaye i-particle agglomeration kunye ne-pulverization zenzeka xa umatshini uvulwa kwakhona, nto leyo ebonisa ukuba itywina phakathi kwepleyiti yoxinzelelo yomatshini weglue kunye nezinto zerabha ayilunganga, kwaye izixhobo kufuneka ziqhagamshelwe ukusombulula ingxaki.
2.2 Isantya somatshini wokuncamathisela sicotha
Xa imveliso isetyenziswa okokuqala, isantya sokukhupha iglue yomatshini wokuncamathisela sicotha kakhulu ngexesha lenkqubo yokuncamathisela. Kukho izizathu ezintathu ezinokwenzeka: ⑴ icandelo A alinamanzi aneleyo, ⑵ ipleyiti yoxinzelelo inkulu kakhulu, kwaye ⑶ uxinzelelo lomthombo womoya alwanelanga.
Xa kufumaniseka ukuba sisizathu sokuqala okanye sesithathu, singasisombulula ngokulungisa uxinzelelo lompu weglue; xa kufumaniseka ukuba sisizathu sesibini, uku-odola ibharele ene-caliber efanayo kunokusombulula ingxaki. Ukuba isantya sokukhupha iglue siyehla ngexesha lokusetyenziswa okuqhelekileyo, kusenokwenzeka ukuba i-mixing core kunye nescreen sesihluzo zivaliwe. Nje ukuba zifunyenwe, izixhobo kufuneka zicocwe ngexesha.
2.3 Ixesha lokuphuma likhawuleza kakhulu okanye licotha kakhulu
Ixesha lokuqhekeka kwe-adhesive yolwakhiwo libhekisa kwixesha elithathwa yi-colloid ukutshintsha ukusuka kwi-paste ukuya kwi-elastic body emva kokuxuba, kwaye ngokubanzi ivavanywa rhoqo emva kwemizuzu emi-5. Kukho izinto ezintathu ezichaphazela ukoma kunye nokuphiliswa komphezulu webhurabha: (1) impembelelo yomlinganiselo wezinto ze-A kunye ne-B, njl.njl.; (2) ubushushu kunye nokufuma (impembelelo yobushushu yeyona nto iphambili); (3) ifomula yemveliso ngokwayo ayinasiphene.
Isisombululo sesizathu (1) kukulungisa umlinganiselo. Ukwandisa umlinganiselo wecandelo B kunokunciphisa ixesha lokunyanga nokwenza umaleko wokuncamathelisa ube nzima kwaye ube buthathaka; ngelixa ukunciphisa umlinganiselo wearhente yokunyanga kuya kwandisa ixesha lokunyanga, umaleko wokunamathela uya kuba thambile, ukuqina kuya kwandiswa kwaye amandla aya kwanda.
Ngokubanzi, umlinganiselo womthamo wecandelo A:B unokulungiswa phakathi (9 ~ 13:1). Ukuba umlinganiselo wecandelo B uphezulu, isantya sokusabela siya kuba khawuleza kwaye ixesha lokuqhekeka liya kuba lifutshane. Ukuba ukusabela kukhawuleza kakhulu, ixesha lokucheba nokumisa umpu liya kuchaphazeleka. Ukuba icotha kakhulu, kuya kuchaphazela ixesha lokomisa le-colloid. Ixesha lokuqhekeka ngokubanzi lihlengahlengiswa phakathi kwemizuzu engama-20 ukuya kwengama-60. Ukusebenza kwe-colloid emva kokunyibilika kolu luhlu lomlinganiselo kuyafana. Ukongeza, xa ubushushu bokwakha buphezulu kakhulu okanye buphantsi kakhulu, sinokunciphisa okanye sonyuse ngokufanelekileyo umlinganiselo wecandelo B (iarhente yokuphilisa), ukuze kufezekiswe injongo yokulungisa ixesha lokomisa lomphezulu kunye nexesha lokuphilisa le-colloid. Ukuba kukho ingxaki kwimveliso ngokwayo, imveliso kufuneka itshintshwe.
2.4 "Iglu yeentyatyambo" iyavela kwinkqubo yokuncamathisela
I-flower gum iveliswa ngenxa yokuxubana okungalinganiyo kwee-colloids zezinto ze-A/B, kwaye ibonakala njengomgca omhlophe wendawo. Izizathu eziphambili zezi: ⑴Umbhobho wecandelo B lomatshini weglu uvaliwe; ⑵Umxube oqinileyo awukacocwa ixesha elide; ⑶Isikali sikhululekile kwaye isantya sokuphuma kweglu asilingani; Ingasonjululwa ngokucoca izixhobo; ngenxa yesizathu (3), kufuneka ujonge isilawuli esilinganayo kwaye wenze uhlengahlengiso olufanelekileyo.
2.5 Ukususwa kwesikhumba okanye ukususwa kwe-colloid ngexesha lenkqubo yokwenza iglu
Xa iglu enamacandelo amabini inyangiwe kancinci ngexesha lenkqubo yokuxuba, iglu eveliswa yiglu gun iya kubonakala ngathi iyalunywa okanye iyalunywa. Xa kungekho nto ingaqhelekanga kwisantya sokucocwa kunye nokuphuma kweglu, kodwa iglu isalunywa okanye iyalunywa, kusenokwenzeka ukuba izixhobo zivaliwe ixesha elide, iglu gun ayicocwanga okanye isibhamu asicocwanga kakuhle, kwaye iglu okanye iglue elunywayo kufuneka ihlanjwe. Ukwakhiwa emva kokucoca.
2.6 Kukho amaqamza omoya kwi-silicone sealant
Ngokubanzi, i-colloid ngokwayo ayinamaqamza omoya, kwaye amaqamza omoya kwi-colloid anokuxutywa nomoya ngexesha lokuthuthwa okanye ukwakhiwa, oku kulandelayo: ⑴I-exhaust ayicocwa xa i-raber barrel itshintshwa; ⑵Izinto zicinezelwa kwipleyiti emva kokuba zifakwe kumatshini. Azicinezelwanga phantsi, nto leyo ebangela ukuba i-defoaming ingaphelelanga. Ke ngoko, i-foam kufuneka isuswe ngokupheleleyo ngaphambi kokusetyenziswa, kwaye umatshini weglue kufuneka usebenze ngokuchanekileyo ngexesha lokusetyenziswa ukuqinisekisa ukutywinwa nokuthintela umoya ukuba ungangeni.
2.7 Ukungabambeleli kakuhle kwi-substrate
I-Sealant ayisiyonto yokuncamathelisa eqhelekileyo, ngoko ke ayinakuqinisekiswa ukuba iya kubophana kakuhle nazo zonke izinto ezisetyenziswayo kwizicelo ezisebenzayo. Ngenxa yokwahlukahlukana kweendlela zonyango lomphezulu we-substrate kunye neenkqubo ezintsha, isantya sokubopha kunye nesiphumo sokubopha se-sealants kunye nezinto ezisetyenziswayo nazo zahlukile.
Kukho iintlobo ezintathu zomonakalo kwi-bonding interface phakathi kwe-structural adhesive kunye ne-substrate. Enye yi-cohesive damage, oko kukuthi, i-cohesive force > cohesive force; enye yi-bond damage, oko kukuthi, i-cohesive force < cohesive force. Indawo yomonakalo we-junction engaphantsi okanye elingana ne-20% iyafaneleka, kwaye indawo yomonakalo we-bond edlula i-20% ayifaneleka; indawo yomonakalo we-bond edlula i-20% yinto engathandekiyo kwizicelo ezisebenzayo. Kunokubakho izizathu ezintandathu ezilandelayo zokuba i-structural adhesive inganamatheli kwi-substrate:
⑴ I-substrate ngokwayo kunzima ukuyibopha, njenge-PP kunye ne-PE. Ngenxa yokuba zi-crystallinity ephezulu ye-molecular kunye noxinzelelo oluphantsi lomphezulu, azikwazi ukwenza ukusasazeka kwe-molecular chain kunye nokuxinana nezinto ezininzi, ngoko azikwazi ukwenza i-bond eqinileyo kwi-interface. Ukunamathela;
⑵ Uluhlu lokubopha lwemveliso luncinci, kwaye lunokusebenza kuphela kwezinye izinto ezisetyenziswayo;
⑶ ixesha lokulungisa alanelanga. Ngokwesiqhelo, i-adhesive yolwakhiwo enamacandelo amabini kufuneka icocwe ubuncinane iintsuku ezi-3, ngelixa i-adhesive enecandelo elinye kufuneka icocwe iintsuku ezi-7. Ukuba ubushushu kunye nokufuma kwendawo yokucocwa kuphantsi, ixesha lokucocwa kufuneka landiswe.
⑷ Umlinganiselo wezinto u-A no-B awulunganga. Xa usebenzisa iimveliso ezinamacandelo amabini, umsebenzisi kufuneka alandele ngokungqongqo umlinganiselo ofunekayo ngumvelisi ukuze alungise umlinganiselo weglue esisiseko kunye nearhente yokulungisa, kungenjalo iingxaki zinokubakho kwinqanaba lokuqala lokulungisa, okanye kwinqanaba lokugqibela lokusetyenziswa ngokubhekiselele ekunamatheleni, ukumelana nemozulu kunye nokuqina. umbuzo;
⑸ Ukusilela ukucoca i-substrate njengoko kufuneka. Ekubeni uthuli, ukungcola kunye nokungcola okukumphezulu we-substrate kuya kuphazamisa ukubopha, kufuneka icocwe ngokungqongqo ngaphambi kokuba uyisebenzise ukuqinisekisa ukuba i-adhesive yolwakhiwo kunye ne-substrate zibotshelelwe kakuhle.
⑹ Ukungaphumeleli ukufaka i-primer njengoko kufuneka. I-primer isetyenziselwa unyango lwangaphambi kokusetyenziswa kumphezulu weprofayili ye-aluminiyam, nto leyo enokuphucula ukumelana namanzi kunye nokuqina kwe-bond ngelixa inciphisa ixesha lokubopha. Ke ngoko, kwizicelo zobunjineli, kufuneka sisebenzise i-primer ngokuchanekileyo kwaye siphephe ngokungqongqo ukukhupha i-gum okubangelwa ziindlela ezingafanelekanga zokusetyenziswa.
2.8 Ukungahambelani nezixhobo
Isizathu sokungahambelani nezixhobo kukuba isitywini sinempendulo ebonakalayo okanye yeekhemikhali xa izixhobo zidibene, nto leyo ebangela iingozi ezifana nokutshintsha kombala wento enamathelayo, ukunganamatheli kwisiseko, ukonakala kokusebenza kwento enamathelayo, kunye nobomi obufutshane bento enamathelayo.
3. Isiphelo
I-silicone structure adhesive inamandla aphezulu, izinzile kakhulu, iyakwazi ukumelana nokuguga, ikwazi ukumelana nobushushu obuphezulu kunye nezinye iimpawu ezintle, kwaye isetyenziswa kakhulu ekubopheleleni kwesakhiwo kwiindonga zekhethini. Nangona kunjalo, kwizicelo ezisebenzayo, ngenxa yezizathu zabantu kunye neengxaki zezinto ezisisiseko ezikhethiweyo (iinkcukacha zokwakha azinakulandelwa ngokungqongqo), ukusebenza kwe-structure adhesive kuchaphazeleka kakhulu, kwaye kwenziwa kube yinto engasebenziyo. Ke ngoko, uvavanyo lokuhambelana kunye novavanyo lokunamathela kweglasi, izinto ze-aluminium kunye nezixhobo kufuneka zihlolwe ngaphambi kokwakhiwa, kwaye iimfuno zekhonkco ngalinye kufuneka zilandelwe ngokungqongqo ngexesha lenkqubo yokwakha, ukuze kufezekiswe isiphumo se-structure adhesive kwaye kuqinisekiswe umgangatho weprojekthi.
Ixesha lokuthumela: Novemba-30-2022