Melamine-formaldehyde resin (MFR) shine resin amino mai zafi mai zafi tare da tauri mai kyau, kwanciyar hankali na zafi, da kuma bayyana gaskiya. Idan aka kwatanta da urea-formaldehyde resin (UF), resin MF yana da mafi kyawun juriya na ruwa da juriya na yanayi. Sabili da haka, ana amfani dashi sosai a cikin rufin panel na waje, katako na bene na kayan ado da samfurori na veneer. Koyaya, gazawar irin su babban ɓarna, fashe mai sauƙi, da ɗan gajeren lokacin ajiya na melamine formaldehyde resin yana iyakance aikace-aikacen sa. Ana amfani da resin MF sau da yawa don shirya takarda fim mai manne da ciki. Plywood da blockboard da ke fuskantar takardan fim mai mannewa, ana kiran su gaba ɗaya allon muhalli. Masu amfani suna son su saboda juriya, rashin ruwa, da launuka iri-iri.
Koyaya, lokacin da zafi na muhalli ya canza, kayan tushe na hukumar muhalli yana da saurin kumburi ko raguwa, yana haifar da rashin daidaituwa na damuwa na ciki. Layer na saman resin MF yana da karye kuma yana da ƙarancin sassauci, kuma yana da saurin fashewa a ƙarƙashin damuwa. Saboda haka, inganta sassaucin resin MF da inganta matsalar tabarbarewa su ne mabuɗin magance matsalar fashewar guduro da inganta ingancin kayan ado. Wannan labarin yafi taƙaita ci gaban bincike kan gyare-gyaren gyare-gyare na MF resin, tare da ra'ayi don samar da jagorar ka'idar da tushen fasaha don magance matsalar guguwa na MF resin.
1. MF halaye na tsarin
MF resin wani fili ne na zobe na triazine da aka samar ta hanyar damfara na melamine da formaldehyde kuma an haɗa su ta hanyar methylene ko ether bond. Yana da barga sinadarai Properties da m tsari. Samuwar resin MF ya kasu kashi biyu: mataki na farko shine ƙarin amsawar melamine da formaldehyde. A ƙarƙashin yanayin tsaka tsaki ko alkaline, melamine yana jurewa hydroxymethylation don samar da 9 daban-daban hydroxymethylmelamines. Mataki na biyu shine amsawar tari. Melamine yana amsawa tare da melamine na methylolated, ko melamine na methylolated yana jurewa don samar da oligomers da aka haɗa ta methylene da ether bonds. A cikin yanayi tare da ƙimar pH na 7 zuwa 8, haɗin haɗin gada na methylene ya mamaye; a cikin yanayi tare da ƙimar pH sama da 9, haɗin haɗin ether zai iya samuwa.
Bayan haɗin giciye da kuma warkar da resin MF, za a iya samun suturar da ba ta dace ba wanda ke da juriya, acid da alkali. Ko da yake murfin da aka warke yana da babban taurin, kuma yana da rauni. Babban dalili shi ne cewa resin MF ya ƙunshi babban adadin zoben triazine da aka haɗa da ƙungiyoyin methylene. Zoben triazine suna da matuƙar karko a ƙarƙashin yanayin tasiri kuma suna da wahalar nakasa da ɗaukar ƙarfin tasiri. Ƙwayoyin methylene kawai zasu iya sha yawancin makamashi, haifar da haɗin gwiwar methylene don karya da kuma nuna brittleness. Rashin cikar maganin guduro na MF zai haifar da tsagewar guduro. Tunda resin resin yafi faruwa tsakanin ƙungiyoyin hydroxyl, wasu ƙungiyoyin hydroxyl waɗanda ba su shiga cikin natsuwa ba zasu kasance a cikin guduro bayan warkewa. Wadannan kungiyoyin hydroxyl suna da wasu hygroscopicity. Kamar yadda yanayin yanayin yanayi ke canzawa akai-akai, ƙungiyoyin hydroxyl na kyauta za su fuskanci hygroscopic da hawan keke kuma a hankali suna haifar da damuwa, haifar da fashe a cikin murfin guduro kuma yana tasiri sosai ga bayyanar da aikin samfurin.
Za'a iya inganta sassaucin guduro na MF yadda ya kamata ta hanyar rage girman haɗin haɗin gwiwa na MF resin da tsawaita tsawon sarkar sa mai sassauƙa. Koyaya, rage yawan haɗin haɗin giciye yana nufin cewa tsayayyen tsarin zoben triazine a cikin guduro ya tarwatse. Sabili da haka, tsayin daka da juriya na resin MF zai shafi nau'ikan digiri daban-daban. Lokacin yin gyare-gyare mai ƙarfi, ya kamata a kula don kula da taurin resin MF kuma kada a lalata kyawawan kaddarorin sa. Zaɓin hanyar gyare-gyaren da ta dace don inganta sassaucin resin MF yana da mahimmanci ga faɗaɗa iyakar aikace-aikacen resin MF.
2. Hanyar gyare-gyare mai ƙarfi na guduro MF
Sau da yawa ana amfani da gyare-gyare mai ƙarfi don haɓaka ƙarfin ƙwararrun polymers masu alaƙa don haɓaka juriya na tasiri da juriya na gajiyar polymer ba tare da lalata tushen asali da kwanciyar hankali na polymer ba. Hanyoyin gyare-gyare masu ƙarfi da suka dace da guduro na MF ana iya raba su zuwa nau'i biyu, wato gyare-gyare na ƙarfafa ƙarfi na waje da gyare-gyaren taurin ciki. Gyaran ƙarfin ƙarfi na waje yana nufin ƙara ƙungiyoyin ƙarfafawa ga guduro na MF ta hanyar haɗawa don samar da tsari mai alaƙa tare da guduro MF don hana zoben triazine kusantar juna don cimma manufar ƙarfafawa. Hanyoyin ƙarfafa waje waɗanda aka fi amfani da su don resin MF sun haɗa da:
1) Ƙara nano-SiO2, nano-cellulose da sauran nanoparticles;
2) Yi amfani da polymers masu sassauƙa na dogon lokaci irin su polyethylene glycol copolymers don samar da hanyoyin sadarwa na polymer interpenetrating (IPNS) a cikin resin MF;
3) Yi amfani da kayan fiber kamar polyvinyl chloride don haɗa resin MF tare don haɓaka kwanciyar hankali na tsarin resin.
Canje-canjen gyare-gyare na ciki yana canza tsarin kwayoyin halittar resin MF ta hanyar shiga cikin maganin maganin resin MF, ƙaddamar da haɗin kai tsakanin zoben triazine, da rage yawan haɗin haɗin giciye don cimma sakamako mai ƙarfi. Hanyoyin taurin ciki sun haɗa da:
1) Gabatar da sassauƙan ƙwayoyin sarka na dogon lokaci tsakanin tsarin zoben triazine na resin MF don tarwatsa tsayayyen tsari;
2) Yi amfani da silicone don ƙaddamar da haɗin kai tsakanin MF resins;
3) Toshe ƙungiyar aikin hydroxyl na resin MF kuma rage girman haɗin haɗin gwiwa na guduro. Abubuwan da aka saba amfani da su na gyaran gyare-gyaren ƙarfi na ciki sun haɗa da polyvinyl barasa, polyurethane, caprolactam, da sauransu.
3. Abubuwan buƙatu na musamman don resin MF don impregnation
Akwai hanyoyi masu tauri da yawa don guduro na MF, amma ba duka ba ne suka dace da shigar da guduro MF. A toughening gyare-gyare na impregnating MF guduro dole ne daidaita da samar da yanayi na m fim takarda, don haka yana da wasu musamman bukatun. Lokacin amfani da guduro MF don impregnation, ya kamata mu ba kawai la'akari da tsaga juriya, sa juriya da sassauci bayan curing na guduro, amma kuma kula da fluidity, permeability da pre-curing digiri na modified guduro kafin curing.
Rashin ruwa mara kyau na guduro na MF zai haifar da busassun furanni a saman bangon bangon bangon bangon bangon bangon bangon bangon bango, yana samar da fararen fararen fata a saman samfurin, yana haifar da lahani. Rashin ƙarancin guduro na MF zai haifar da rashin cika ciki, yana haifar da rashin manne ko ƙasa mara daidaituwa akan saman samfurin. Inorganic nano-wear-resistant kayan iya ƙara tauri da lalacewa-resistant Properties na MF guduro, amma a lokaci guda za su ƙara danko na MF guduro da kuma rage ruwa na guduro, game da shi rinjayar da impregnation yi na MF resin. Mun gano cewa danko na MF resin yana ƙaruwa tare da karuwa a cikin adadin nano-SiO2 mai jure lalacewa (HTSi-03). Dankowar tsarin resin MF da aka gyara shine 20.9 s (25°C), kuma kusurwar lamba tsakanin resin MF da takardan ado ya karu daga 5° zuwa 30°. A lokaci guda kuma, raguwa yana raguwa, don haka resin MF ba zai iya cika ɓangarorin da ke cikin takarda na ado ba, kuma suturar lalacewa ba zai iya kare shi gaba ɗaya ba, yana haifar da raguwa a cikin juriya.
Ƙananan pre-curing digiri na MF resin zai haifar da babban canji yayin aikin veneer, yana haifar da rigar furannin saman don rinjayar aikin saman. Polyhydroxyl barasa modifiers iya yadda ya kamata ƙara da sassauci na MF resin, amma wasu hydrophilicity na polyhydroxyl modifiers ba su dace da bushewa na impregnated m film takarda, game da shi rage pre-curing digiri na MF resin. Wannan yana haifar da matsaloli kamar shayar da danshi da mannewa da takardan fim ɗin da ke ciki da kuma wahalar shiga. A lokaci guda kuma, takarda fim ɗin da aka yi da shi tare da ƙananan digiri na farko da za a yi amfani da shi zai fitar da ruwa mai yawa a lokacin aikin zafi mai zafi, yana haifar da matsaloli irin su raguwar ƙarar ƙarar maɗaukaki da raguwa na resin Layer, yana rinjayar aikin samfurin.
Sabili da haka, la'akari da ainihin matsalolin samarwa, wakilin MF resin toughening wanda aka yi amfani da shi don haɓakawa ya kamata ya yi amfani da mai gyara tare da ƙananan nauyin kwayoyin halitta, ƙananan abun ciki na hydroxyl, da haɓakawa mai girma don rage tasirin mai gyara akan ruwa da pre-curing digiri na resin MF. A lokaci guda, ana buƙatar wakili mai toughening don daidaitawa da yanayin warkewa na resin MF da aka yi amfani da shi don haɓakawa, kuma har yanzu yana kula da tasirin gyare-gyare bayan an latsa zafi.
Gyaran guduro na MF don yin ciki yana buƙatar la'akari da abubuwa da yawa a lokaci guda. Madaidaicin gyare-gyare zai haɓaka sassaucin resin MF ba tare da mummunan tasiri ga juriya na lalacewa ba, ruwa ko tsari na riga-kafi. Saboda haka, ana ba da shawarar cewa bincike na gaba game da gyare-gyaren resin MF ya kamata a gudanar da shi daga abubuwa uku masu zuwa.
1) Dangane da tsarin guduro na MF, ana iya magance matsalar raguwar guduro ta MF ta hanyar daidaita ma'aunin haɗin giciye na guduro MF.
2) Haɗa nau'ikan nau'ikan ƙarfi daban-daban, gabatar da tsarin sarkar mai sassauƙa tare da ƙungiyoyi masu aiki da yawa a cikin resin MF, da haɓaka sassaucin resin MF ta hanyar haɗin gwiwar haɗin jiki da halayen sinadaran.
3) Daga hangen nesa na sauƙaƙe tsarin samarwa da kuma adana farashi, zaɓi gyare-gyaren gyare-gyare mai mahimmanci wanda ya dace da samar da masana'antu.
Ƙarin bayani game da SINOYQX modified melamine formaldehyde resin, da fatan za a tuntuɓe mu ta imel: [email protected] , ko a yi mana magana a: +86-28-8411-1861.
Ana sake buga wasu hotuna da rubutu daga Intanet, kuma haƙƙin mallaka na ainihin marubucin ne. Idan akwai wani cin zarafi, da fatan za a tuntuɓe mu don sharewa.