Kukula kwautomoni wa polyester wosakhutaZinthuzi zili ndi mbiri ya zaka zoposa 70. M'nthawi yochepa chonchi, zinthu zopangidwa ndi polyester resin zosakhuta zakula mofulumira pankhani yotulutsa ndi luso. Popeza zinthu zakale zopangidwa ndi polyester resin zosakhuta zakula kukhala imodzi mwa mitundu yayikulu kwambiri mumakampani opanga ma resin otenthetsera kutentha. Pakupanga ma resin osakhuta a polyester, zambiri zaukadaulo pa ma patent azinthu, magazini amalonda, mabuku aukadaulo, ndi zina zotero zimatuluka chimodzi ndi chimodzi. Pakadali pano, pali mazana a ma patent opanga zinthu chaka chilichonse, omwe amagwirizana ndi utomoni wosakhuta wa polyester. Zikuoneka kuti ukadaulo wopanga ndi kugwiritsa ntchito utomoni wosakhuta wakula kwambiri ndi chitukuko cha kupanga, ndipo pang'onopang'ono wapanga njira yakeyake yapadera komanso yokwanira yaukadaulo yopanga ndi chiphunzitso chogwiritsa ntchito. M'mbuyomu, ma resin osakhuta a polyester apereka thandizo lapadera pakugwiritsa ntchito kwa anthu onse. M'tsogolomu, idzakula m'magawo ena apadera, ndipo nthawi yomweyo, mtengo wa ma resin wamba udzachepetsedwa. Nazi zina mwa mitundu yosangalatsa komanso yodalirika ya unsaturated polyester resin, kuphatikizapo: low shrinkage resin, flame resin retardant, toughening resin, low styrene volatilization resin, corruption-resistant, gel coat resin, light curing resin Unsaturated polyester resins, unsaturated resins okhala ndi makhalidwe apadera, ndi tree fingers zogwira ntchito kwambiri zopangidwa ndi zipangizo zatsopano ndi njira zatsopano.
1. Utomoni wochepa wa shrinkage
Mtundu uwu wa utomoni ukhoza kukhala nkhani yakale chabe. Utomoni wosakwanira wa polyester umakhala ndi kuchepa kwakukulu panthawi yokonza, ndipo kuchuluka kwa kuchepa kwa voliyumu ndi 6-10%. Kuchepa kumeneku kumatha kuwononga kwambiri kapena kuswa zinthuzo, osati mu njira yopangira compression (SMC, BMC). Pofuna kuthana ndi vutoli, ma resin a thermoplastic nthawi zambiri amagwiritsidwa ntchito ngati zowonjezera zocheperako. Patent m'derali idaperekedwa kwa DuPont mu 1934, nambala ya patent US 1.945,307. Patent iyi ikufotokoza za copolymerization ya dibasic antelopelic acids ndi mankhwala a vinyl. Mwachionekere, panthawiyo, patent iyi idayambitsa ukadaulo wotsika kwambiri wa ma resin a polyester. Kuyambira pamenepo, anthu ambiri adzipereka kuphunzira machitidwe a copolymer, omwe panthawiyo ankaonedwa kuti ndi ma alloys apulasitiki. Mu 1966 ma resin a Marco otsika kwambiri adagwiritsidwa ntchito koyamba popanga ndi kupanga mafakitale.
Pambuyo pake bungwe la Plastics Industry Association linatcha mankhwalawa kuti "SMC", zomwe zikutanthauza kuti sheet molding compound, ndipo low-shrinkage premix compound yake "BMC" imatanthauza bulk molding compound. Pa mapepala a SMC, nthawi zambiri pamafunika kuti zigawo zopangidwa ndi resin zikhale ndi kulekerera bwino, kusinthasintha komanso A-grade gloss, ndipo ming'alu yaying'ono pamwamba iyenera kupewedwa, zomwe zimafuna kuti resin yofanana ikhale ndi shrinkage rate yochepa. Zachidziwikire, ma patent ambiri kuyambira pamenepo asintha ndikuwongolera ukadaulo uwu, ndipo kumvetsetsa momwe mphamvu ya shrinkage imagwirira ntchito kwakula pang'onopang'ono, ndipo zinthu zosiyanasiyana zochepetsera kapena zowonjezera zochepa zawonekera nthawi ndi nthawi. Zowonjezera zochepa zomwe zimagwiritsidwa ntchito nthawi zambiri ndi polystyrene, polymethyl methacrylate ndi zina zotero.
2. Utomoni woletsa moto
Nthawi zina zinthu zoletsa moto zimakhala zofunika kwambiri monga kupulumutsa mankhwala osokoneza bongo, ndipo zinthu zoletsa moto zimatha kupewa kapena kuchepetsa ngozi. Ku Europe, chiwerengero cha imfa za moto chatsika ndi pafupifupi 20% m'zaka khumi zapitazi chifukwa chogwiritsa ntchito zinthu zoletsa moto. Chitetezo cha zinthu zoletsa moto nachonso n'chofunika kwambiri. Ndi njira yocheperako komanso yovuta kulinganiza mtundu wa zinthu zomwe zimagwiritsidwa ntchito m'mafakitale. Pakadali pano, European Community yachita ndipo ikuchita kuwunika zoopsa pazinthu zambiri zoletsa moto zochokera ku halogen ndi halogen-phosphorus., zambiri zomwe zidzamalizidwa pakati pa 2004 ndi 2006. Pakadali pano, dziko lathu nthawi zambiri limagwiritsa ntchito ma diol okhala ndi chlorine kapena bromine kapena dibasic acid halogen m'malo mwake ngati zinthu zopangira ma resins oletsa moto. Zinthu zoletsa moto za halogen zimapanga utsi wambiri zikamayaka, ndipo zimaphatikizidwa ndi kupanga hydrogen halide yokwiyitsa kwambiri. Utsi wambiri ndi utsi woopsa womwe umapangidwa panthawi yoyaka zimayambitsa mavuto akulu kwa anthu.
Zoposa 80% za ngozi zamoto zimachitika chifukwa cha izi. Vuto lina logwiritsa ntchito zinthu zoletsa moto zochokera ku bromine kapena hydrogen ndikuti mpweya wowononga komanso wowononga chilengedwe umapangidwa ukawotchedwa, zomwe zimapangitsa kuti zinthu zamagetsi ziwonongeke. Kugwiritsa ntchito zinthu zoletsa moto zopanda chilengedwe monga alumina wosungunuka, magnesium, canopy, molybdenum compounds ndi zina zowonjezera zoletsa moto zimatha kupanga utsi wochepa komanso poizoni wochepa, ngakhale kuti zimakhala ndi zotsatira zoonekeratu zoletsa utsi. Komabe, ngati kuchuluka kwa zinthu zoletsa moto zopanda chilengedwe kuli kwakukulu kwambiri, sikuti kukhuthala kwa utomoni kudzawonjezeka kokha, komwe sikungathandize kumanga, komanso ngati kuchuluka kwa zinthu zoletsa moto zowonjezera kuwonjezeredwa ku utomoni, kudzakhudza mphamvu ya makina ndi mphamvu zamagetsi za utomoni ukatha kusungunuka.
Pakadali pano, ma patent ambiri akunja anena za ukadaulo wogwiritsa ntchito zinthu zoletsa moto zochokera ku phosphorous kuti apange ma resin oletsa moto otsika komanso utsi wochepa. Zinthu zoletsa moto zochokera ku phosphorous zimakhala ndi mphamvu yayikulu yoletsa moto. Asidi wa metaphosphoric womwe umapangidwa panthawi yoyaka ukhoza kusinthidwa kukhala polymer wokhazikika, kupanga gawo loteteza, kuphimba pamwamba pa chinthu choyaka, kupatula mpweya, kulimbikitsa kusowa madzi m'thupi ndi carbonization ya pamwamba pa utomoni, ndikupanga filimu yoteteza yokhala ndi carbon. Potero kupewa kuyaka ndipo nthawi yomweyo zinthu zoletsa moto zochokera ku phosphorous zingagwiritsidwenso ntchito limodzi ndi zinthu zoletsa moto za halogen, zomwe zimakhala ndi mphamvu yogwirizana bwino. Zachidziwikire, njira yofufuzira yamtsogolo ya utomoni woletsa moto ndi utsi wochepa, poizoni wochepa komanso mtengo wotsika. Utomoni woyenera ndi wopanda utsi, poizoni wochepa, wotsika mtengo, sukhudza utomoni, uli ndi mphamvu zakuthupi, sufunika kuwonjezera zinthu zina, ndipo ukhoza kupangidwa mwachindunji mufakitale yopanga utomoni.
3. Utomoni wolimbitsa
Poyerekeza ndi mitundu yoyambirira ya unsaturated polyester resin, kulimba kwa utomoni komwe kulipo kwasintha kwambiri. Komabe, chifukwa cha chitukuko cha makampani otsatira a unsaturated polyester resin, zofunikira zatsopano zikuperekedwa kuti utomoni wosaturated ugwire ntchito, makamaka pankhani ya kulimba. Kufooka kwa utomoni wosaturated pambuyo pouma kwakhala vuto lalikulu lomwe likulepheretsa kupanga utomoni wosaturated. Kaya ndi chinthu chopangidwa ndi manja chopangidwa ndi anthu kapena chinthu chopangidwa ndi mabala, kutalika kwake pakagwa kukukhala chizindikiro chofunikira chowunikira mtundu wa zinthu za utomoni.
Pakadali pano, opanga ena akunja amagwiritsa ntchito njira yowonjezera utomoni wokhuthala kuti akonze kulimba. Monga kuwonjezera polyester yokhuthala, rabara ya styrene-butadiene ndi rabara ya carboxy-terminated (suo-) styrene-butadiene, ndi zina zotero, njira iyi ndi ya njira yolimbikitsira thupi. Ingagwiritsidwenso ntchito kuyika ma polima otchinga mu unyolo waukulu wa polyester yosakhuthala, monga kapangidwe ka netiweki yolumikizirana yopangidwa ndi utomoni wokhuthala wa polyester ndi epoxy resin ndi polyurethane resin, zomwe zimathandizira kwambiri mphamvu yokoka ndi mphamvu yokoka ya utomoni. , njira yolimbikitsira iyi ndi ya njira yolimbikitsira mankhwala. Kuphatikiza kwa kulimbitsa thupi ndi kulimbitsa mankhwala kungagwiritsidwenso ntchito, monga kusakaniza polyester yosakhuthala yogwira ntchito kwambiri ndi zinthu zosagwira ntchito kwambiri kuti mukwaniritse kusinthasintha komwe mukufuna.
Pakadali pano, mapepala a SMC akhala akugwiritsidwa ntchito kwambiri mumakampani opanga magalimoto chifukwa cha kulemera kwawo kopepuka, mphamvu zawo zambiri, kukana dzimbiri, komanso kusinthasintha kwa kapangidwe kawo. Pazinthu zofunika monga mapanelo a magalimoto, zitseko zakumbuyo, ndi mapanelo akunja, kulimba bwino kumafunika, monga mapanelo akunja a magalimoto. Alonda amatha kupindika pang'ono ndikubwerera ku mawonekedwe awo oyambirira atagunda pang'ono. Kuonjezera kulimba kwa utomoni nthawi zambiri kumataya zinthu zina za utomoni, monga kuuma, mphamvu yopindika, kukana kutentha, ndi liwiro lochira panthawi yomanga. Kukonza kulimba kwa utomoni popanda kutaya zinthu zina za utomoni kwakhala nkhani yofunika kwambiri pakufufuza ndi kupanga ma resini a polyester osakhuta.
4. Utomoni wochepa wa styrene wosakhazikika
Pokonza utomoni wa polyester wosakhuta, styrene woopsa wosasunthika udzawononga kwambiri thanzi la ogwira ntchito yomanga. Nthawi yomweyo, styrene imatulutsidwa mumlengalenga, zomwe zimayambitsanso kuipitsidwa kwa mpweya. Chifukwa chake, akuluakulu ambiri amachepetsa kuchuluka kwa styrene mumlengalenga wa malo opangira zinthu. Mwachitsanzo, ku United States, mulingo wake wovomerezeka (mulingo wovomerezeka) ndi 50ppm, pomwe ku Switzerland PEL yake ndi 25ppm, kuchuluka kotereku sikophweka. Kudalira mpweya wamphamvu kumakhalanso kochepa. Nthawi yomweyo, mpweya wamphamvu udzapangitsanso kuti styrene itayike pamwamba pa chinthucho ndikusinthasintha kwa styrene yambiri mumlengalenga. Chifukwa chake, kuti mupeze njira yochepetsera kusinthasintha kwa styrene, kuchokera muzu, ndikofunikirabe kumaliza ntchito iyi mufakitale yopanga utomoni. Izi zimafuna kupanga ma resin otsika a styrene volatility (LSE) omwe saipitsa mpweya kapena kuchepetsa kuipitsa mpweya, kapena ma resin a polyester osakhuta opanda ma monomers a styrene.
Kuchepetsa kuchuluka kwa ma monomers osasunthika kwakhala nkhani yomwe yapangidwa ndi makampani akunja a polyester resin osasungunuka m'zaka zaposachedwa. Pali njira zambiri zomwe zikugwiritsidwa ntchito pano: (1) njira yowonjezera zoletsa kusinthasintha kwa kutentha; (2) kupanga ma resin a polyester osasungunuka opanda ma monomers a styrene kumagwiritsa ntchito divinyl, vinylmethylbenzene, α-methyl Styrene m'malo mwa ma monomers a vinyl okhala ndi ma monomers a styrene; (3) Kupanga ma resin a polyester osasungunuka okhala ndi ma monomers otsika a styrene ndikugwiritsa ntchito ma monomers omwe ali pamwambapa ndi ma monomers a styrene pamodzi, monga kugwiritsa ntchito diallyl phthalate Kugwiritsa ntchito ma monomers a vinyl owira kwambiri monga ma esters ndi ma copolymer a acrylic okhala ndi ma monomers a styrene: (4) Njira ina yochepetsera kusinthasintha kwa kutentha kwa styrene ndikulowetsa mayunitsi ena monga dicyclopentadiene ndi zotumphukira zake mu ma polyester osasungunuka. Resin skeleton, kuti mupeze kukhuthala kochepa, ndikuchepetsa kuchuluka kwa styrene monomer.
Pofunafuna njira yothetsera vuto la kusinthasintha kwa styrene, ndikofunikira kuganizira mokwanira momwe utomoni ungagwiritsidwire ntchito pa njira zomwe zilipo kale monga kupopera pamwamba, njira yothira mafuta, njira yopangira SMC, mtengo wa zipangizo zopangira mafakitale, komanso kugwirizana ndi dongosolo la utomoni. , Resin reactivity, viscosity, mphamvu zamakina za utomoni pambuyo pa kusinthasintha, ndi zina zotero. M'dziko langa, palibe lamulo lomveka bwino loletsa kusinthasintha kwa styrene. Komabe, ndi kusintha kwa miyoyo ya anthu komanso kusintha kwa chidziwitso cha anthu pa thanzi lawo komanso kuteteza chilengedwe, ndi nkhani ya nthawi yochepa kuti malamulo oyenera afunike kudziko losakhutira ndi ogula ngati ife.
5. Utomoni wosagwira dzimbiri
Chimodzi mwa ntchito zazikulu za ma resini a polyester osadzazidwa ndi kukana dzimbiri kwa mankhwala monga organic solvents, acids, bases, ndi salts. Malinga ndi kuyambitsidwa kwa akatswiri a unsaturated resin network, ma resini omwe alipo pano sagonjetsedwa ndi dzimbiri amagawidwa m'magulu otsatirawa: (1) mtundu wa o-benzene; (2) mtundu wa iso-benzene; (3) mtundu wa p-benzene; (4) mtundu wa bisphenol A; (5) mtundu wa vinyl ester; ndi ena monga mtundu wa xylene, mtundu wa halogen-containing compound, ndi zina zotero. Pambuyo pa zaka makumi ambiri asayansi akupitiliza kufufuza, dzimbiri la resin ndi njira yolimbana ndi dzimbiri zaphunziridwa bwino. Resin imasinthidwa ndi njira zosiyanasiyana, monga kuyika mafupa a molecular omwe ndi ovuta kukana dzimbiri mu unsaturated polyester resin, kapena kugwiritsa ntchito unsaturated polyester, vinyl ester ndi isocyanate kuti apange kapangidwe ka netiweki yolumikizirana, yomwe ndi yofunika kwambiri pakukweza kukana kwa dzimbiri kwa resin. Kukana kwa dzimbiri ndi kothandiza kwambiri, ndipo resini yopangidwa ndi njira yosakaniza usin wa acid ingathandizenso kukana dzimbiri bwino.
Poyerekeza ndima resini a epoxy,Kutsika mtengo komanso kosavuta kwa ma resini a polyester osakhuta kwakhala ubwino waukulu. Malinga ndi akatswiri a unsaturated resin, kukana dzimbiri kwa unsaturated polyester resin, makamaka alkali resistance, n'kotsika kwambiri poyerekeza ndi epoxy resin. Sizingalowe m'malo mwa epoxy resin. Pakadali pano, kukwera kwa pansi kotsutsana ndi dzimbiri kwapanga mwayi ndi zovuta kwa ma resini a polyester osakhuta. Chifukwa chake, kupanga ma resini apadera otsutsana ndi dzimbiri kuli ndi mwayi waukulu.
Chovala cha gel chimagwira ntchito yofunika kwambiri pazinthu zopangidwa ndi zinthu zosiyanasiyana. Sikuti chimangokongoletsa pamwamba pa zinthu zopangidwa ndi FRP, komanso chimagwira ntchito yolimbana ndi kutopa, kukalamba komanso kukana dzimbiri. Malinga ndi akatswiri ochokera ku netiweki ya unsaturated resin, njira yopangira gel coat resin ndikupanga gel coat resin yokhala ndi styrene yochepa, kuumitsa bwino mpweya komanso kukana dzimbiri mwamphamvu. Pali msika waukulu wa gel coat zomwe sizimatentha mu gel coat resin. Ngati zinthu za FRP zitamizidwa m'madzi otentha kwa nthawi yayitali, matuza adzawonekera pamwamba. Nthawi yomweyo, chifukwa cha kulowa pang'onopang'ono kwa madzi mu zinthu zopangidwa ndi zinthu zosiyanasiyana, matuza pamwamba adzakula pang'onopang'ono. Matuza sadzangokhudza mawonekedwe a gel coat pang'onopang'ono amachepetsa mphamvu ya chinthucho.
Cook Composites and Polymers Co. ya ku Kansas, USA, imagwiritsa ntchito njira zochotsera epoxy ndi glycidyl ether kuti ipange utomoni wa gel coat wokhala ndi kukhuthala kochepa komanso kukana bwino madzi ndi zosungunulira. Kuphatikiza apo, kampaniyo imagwiritsanso ntchito utomoni wa polyol-modified ndi epoxy-terminated A (flexible resin) ndi dicyclopentadiene (DCPD)-modified resin B (rigid resin), zonse ziwiri zomwe zimakhala ndi Pambuyo pophatikizana, utomoni wokhala ndi kukana madzi sungakhale ndi kukana bwino madzi kokha, komanso umakhala ndi kulimba komanso mphamvu zabwino. Zosungunulira kapena zinthu zina zochepa zamamolekyulu zimalowa mu dongosolo la zinthu za FRP kudzera mu gel coat wosanjikiza, kukhala utomoni wosagwira madzi wokhala ndi makhalidwe abwino kwambiri.
7. Kuchiritsa utomoni wa polyester wosakhwima pang'ono
Makhalidwe a unsaturated polyester resin omwe amateteza kuwala ndi moyo wautali m'miphika komanso liwiro loteteza kuwala mwachangu. Unsaturated polyester resin amatha kukwaniritsa zofunikira zochepetsera kusinthasintha kwa styrene poteteza kuwala. Chifukwa cha kupita patsogolo kwa photosensitizers ndi zida zowunikira, maziko a chitukuko cha unsaturated polyester resin omwe amateteza kuwala ayikidwa. Unsaturated polyester resin zosiyanasiyana zomwe zimateteza kuwala zapangidwa bwino ndikuyikidwa mu kupanga kwakukulu. Kapangidwe ka zinthu, magwiridwe antchito ake komanso kukana kuvala pamwamba kwawonjezeka, ndipo magwiridwe antchito opangira amawonjezekanso pogwiritsa ntchito njirayi.
8. Utomoni wotsika mtengo wokhala ndi makhalidwe apadera
Ma resin oterewa akuphatikizapo ma resin okhala ndi thovu ndi ma resin amadzi. Pakadali pano, kusowa kwa mphamvu ya matabwa kukukwera kwambiri. Palinso kusowa kwa akatswiri ogwira ntchito m'makampani opanga matabwa, ndipo antchito awa akulipidwa kwambiri. Zinthu zotere zimapangitsa kuti mapulasitiki aukadaulo alowe mumsika wamatabwa. Ma resin okhala ndi thovu losakhuta ndi ma resin okhala ndi madzi adzapangidwa ngati matabwa opangira mumakampani opanga mipando chifukwa cha mtengo wawo wotsika komanso mphamvu zawo zambiri. Kugwiritsa ntchito kudzakhala pang'onopang'ono poyamba, kenako ndikusintha kosalekeza kwa ukadaulo wopangira, kugwiritsa ntchito kumeneku kudzapangidwa mwachangu.
Ma resini a polyester osakhuthala amatha kupangidwa ndi thovu kuti apange ma resini opangidwa ndi thovu omwe angagwiritsidwe ntchito ngati makoma, zogawa bafa zomwe zapangidwa kale, ndi zina zambiri. Kulimba ndi mphamvu ya pulasitiki yopangidwa ndi thovu yokhala ndi unsaturated polyester resin ngati matrix ndikwabwino kuposa ya PS yopangidwa ndi thovu; ndikosavuta kuikonza kuposa PVC yopangidwa ndi thovu; mtengo wake ndi wotsika kuposa wa pulasitiki ya polyurethane yopangidwa ndi thovu, ndipo kuwonjezera zinthu zoletsa moto kungapangitsenso kuti ikhale yoletsa moto komanso yoletsa ukalamba. Ngakhale ukadaulo wogwiritsira ntchito utomoni wapangidwa mokwanira, kugwiritsa ntchito utomoni wa polyester wosakhuthala wopangidwa ndi thovu m'mipando sikunayang'aniridwe kwambiri. Pambuyo pofufuza, opanga ena a resini ali ndi chidwi chachikulu chopanga mtundu watsopanowu wazinthu. Mavuto ena akuluakulu (kupukuta khungu, kapangidwe ka uchi, ubale wa nthawi yopangira thovu ndi gel, kuwongolera ma curve a exothermic sanathetsedwe kwathunthu asanapangidwe malonda. Mpaka yankho litapezeka, utomoni uwu ukhoza kugwiritsidwa ntchito kokha chifukwa cha mtengo wake wotsika Mumakampani opanga mipando. Mavutowa akathetsedwa, utomoni uwu udzagwiritsidwa ntchito kwambiri m'malo monga zinthu zoletsa moto wa thovu m'malo mongogwiritsa ntchito ndalama zake.
Ma resini a polyester osadzazidwa okhala ndi madzi akhoza kugawidwa m'mitundu iwiri: mtundu wosungunuka m'madzi ndi mtundu wa emulsion. Kale m'ma 1960 kunja, pakhala pali ma patent ndi malipoti a mabuku m'derali. Resini yokhala ndi madzi ndi yowonjezera madzi ngati chodzaza cha unsaturated polyester resin ku resini isanayambe resini, ndipo kuchuluka kwa madzi kumatha kufika 50%. Resini yotereyi imatchedwa WEP resin. Resini ili ndi makhalidwe otsika mtengo, kulemera kopepuka pambuyo pouma, kuchedwa kwa moto wabwino komanso kuchepa pang'ono. Kupanga ndi kufufuza kwa unsaturated wokhala ndi madzi m'dziko langa kunayamba m'ma 1980, ndipo kwakhala nthawi yayitali. Ponena za kugwiritsa ntchito, yagwiritsidwa ntchito ngati chothandizira chomangirira. Unsaturated polyester resin wamadzi ndi mtundu watsopano wa UPR. Ukadaulo mu labotale ukukulirakulira, koma pali kafukufuku wochepa pakugwiritsa ntchito. Mavuto omwe akufunika kuthetsedwa kwambiri ndi kukhazikika kwa emulsion, mavuto ena pakukonza ndi kupanga, komanso vuto la kuvomerezedwa ndi makasitomala. Kawirikawiri, utomoni wa polyester wosakhuta wa matani 10,000 ukhoza kupanga matani pafupifupi 600 a madzi otayira chaka chilichonse. Ngati kuchepa komwe kumachitika popanga utomoni wa polyester wosakhuta kumagwiritsidwa ntchito popanga utomoni wokhala ndi madzi, kumachepetsa mtengo wa utomoni ndikuthetsa vuto loteteza chilengedwe popanga.
Timagwira ntchito ndi zinthu zotsatirazi za utomoni: unsaturated polyester resin;utomoni wa viniluutomoni wa gel coat; utomoni wa epoxy.
Timapangansofiberglass direct roving,mphasa za fiberglass, maukonde a fiberglass, ndinsalu yoluka ya fiberglass.
Lumikizanani nafe :
Nambala ya foni: +8615823184699
Nambala ya foni: +8602367853804
Email:marketing@frp-cqdj.com
Nthawi yotumizira: Juni-08-2022
