Kupanga ndi Kugwiritsa Ntchito Mapepala Omangira Mapepala

Mapepala akamaumba pawiri amatanthauza unsaturated poliyesitala utomoni monga thupi lalikulu, kuwonjezera kuchiritsa wothandizila nkhungu kumasula wothandizila, filler, otsika shrinkage wothandizira, thickener, etc. akamaumba pawiri yokutidwa ndi polyethylene (PE) filimu.Pepalali limafotokoza mwachidule momwe ma SMC amapangidwira komanso magulu.

Mapangidwe a Sheet Molding Compound

SMC imapangidwa ndi unsaturated polyester resin, crosslinking agent, initiator, filler, thickener, release agent, glass fiber, ndi polymerization inhibitor.Pakati pawo, magulu anayi oyambirira makamaka amapereka chimango cha zinthu zakuthupi ndikuwonjezera mphamvu.Magulu anayi omaliza ndi azinthu zakuchulukira kukhuthala, kukana dzimbiri, kutchinjiriza, komanso kukhazikika kwazinthuzo.

1. Unsaturated polyester resin ndi crosslinking agents ndi thupi lalikulu la SMC.Unsaturated polyester resins nthawi zambiri polycondensed kuchokera unsaturated dicarboxylic zidulo (kapena anhydrides), saturated dicarboxylic zidulo (kapena anhydrides), ndi polyols.Lili ndi zinthu zina zamakina ndi mphamvu, ndipo mphamvu yamkati imakhala yofanana.The crosslinking wothandizira makamaka styrene.Ziwirizi zitalumikizidwa, ndizo zida zazikulu zochiritsira mapulasitiki azinthu, zomwe zimagwira ntchito yolumikizira, kuthandizira, kufalikira, komanso chitetezo.

2. Woyambitsa amachititsa utomoni ndi crosslinker kuchiritsa ndi kupanga mu siteji ya phala la utomoni.Ntchito yake makamaka ndi kupanga utomoni ndi chomangira iwiri mu mtanda kulumikiza monoma monga styrene copolymerize kuti SMC akhoza olimba ndi kupangidwa mu nkhungu patsekeke.

3. Chodzazacho chimakhala choposa gawo limodzi mwa magawo atatu a mapepala opangira mapepala ndipo amatha kusintha maonekedwe a makina opangira.Nthawi zambiri imayenera kukhala ndi mphamvu yokoka yotsika, mtengo wotsika wa adsorption wamafuta, ma pores ochepera, kukana dzimbiri, komanso mtengo wotsika.Zomwe zimagwiritsidwa ntchito nthawi zambiri zimakhala CaCO3, Al(OH)3, ndi zina zotero.

4. Thickeners amapatsa SMC malo owoneka bwino, osamata.Kukonzekera kwa mapepala ndi zinthu zambiri zomangira kumafuna kukhuthala kotsika kwa utomoni kuti zithandizire kulowetsedwa kwa utomoni wagalasi ndi kudzaza ndi utomoni.Ndipo psinjika akamaumba amafuna apamwamba mamasukidwe akayendedwe.Choncho, m'pofunika kuwonjezera thickener pamaso akamaumba ndondomeko kutembenuza otsika mamasukidwe akayendedwe a galasi CHIKWANGWANI impregnation mu mkulu mamasukidwe akayendedwe kuti si zomata.

5. Wothandizira kumasulidwa amalepheretsa pepala lopangira mapepala kuti likhale logwirizana ndi nkhungu yachitsulo pamwamba.Wotulutsa amatha kuletsa unsaturated polyester resin kuti asagwirizane ndi pamwamba pa nkhungu yachitsulo panthawi ya pulasitiki yosakanikirana ndi utomoni.Makamaka mafuta azidulo amtali wautali kapena mchere woimiridwa ndi zinc stearate.Kugwiritsa ntchito mopitirira muyeso kumachepetsa mosavuta ntchito ya mankhwala.Zomwe zimagwiritsidwa ntchito nthawi zonse zimatengera 1 ~ 3% yazinthu zonse kuti zitsimikizire mtundu wa chinthucho.

6. Ulusi wagalasi ukhoza kupititsa patsogolo kukana kwa dzimbiri ndi kutchinjiriza katundu wa SMC.Kumangirira mapepala nthawi zambiri kumasankha matiresi odulidwa agalasi ngati chowonjezera.Kugwiritsa ntchito mopitirira muyeso kumapangitsa kuti mankhwalawa akhale ovuta kwambiri, ndipo kugwiritsa ntchito mlingo wochepa kwambiri sikudzakhala ndi zotsatira zoonekeratu zolimbitsa mankhwala.Kugwiritsa ntchito pafupipafupi ndi pafupifupi 20%.Mwa njira imeneyi, mankhwala akhoza kukumana njira ziwiri za extrusion akamaumba ndi psinjika akamaumba.

7. Inhibitor imawonjezera kukhazikika kwa SMC ndikuwonjezera nthawi yosungira.Popeza initiator styrene adzakhala kuwola pang'onopang'ono, kuchititsa polymerization wa utomoni, kuwonjezera mlingo woyenera wa ufulu kwakukulu mkangaziwisi (polymerization inhibitor) akhoza kuchepetsa liwiro la kuvunda styrene ndi kutalikitsa nthawi yosungirako.Zoletsa nthawi zambiri zimakhala benzoquinones ndi polyvalent phenolic mankhwala.

Kugwiritsa Ntchito Sheet Molding Compound Products

SMC ili ndi ubwino wochita bwino kwambiri zamagetsi, kukana kwamphamvu kwa dzimbiri, kupepuka, kosavuta komanso kosinthika kamangidwe kaumisiri, ndi zina zambiri.Chifukwa chake, amagwiritsidwa ntchito kwambiri m'magawo asanu ndi atatu monga makampani amagalimoto, magalimoto apanjanji, zomangamanga, zida zamagetsi, ndi kulumikizana (Table 1).

Pakati pawo, kumayambiriro, ankagwiritsidwa ntchito makamaka ngati matabwa otetezera m'madera omanga, zipangizo zamagetsi, ndi mauthenga, ndipo lusoli ndi lokhwima.Kenako idagwiritsidwa ntchito m'mafakitale agalimoto m'malo mwa zitsulo ndi aluminiyamu aloyi zida za thupi kuti achepetse kulemera kwagalimoto.

Pansi pa kupulumutsa mphamvu kwapano ndi kuchepetsa utsi komanso kupanga magalimoto atsopano opangira mphamvu, ukadaulo wazinthu zamagalimoto ukupitilizabe kukula mpaka kupepuka komanso kwapamwamba.Mpaka pano, kugwiritsa ntchito zida za SMC kumawonedwa kulikonse m'moyo watsiku ndi tsiku.Zimawonetsedwa ndi mauthenga opanda zingwe, mpanda wamagetsi osaphulika, zipangizo zotetezera pansi, zimbudzi, ndi njanji zothamanga kwambiri.

Table 1 Ntchito zazikulu zisanu ndi zitatu ndikugawa magawo azinthu za SMC

Fotokozerani mwachidule

Unsaturated polyester resin, crosslinking agent, initiator, ndi filler mu pepala akamaumba pawiri amapereka chimango chakuthupi cha mankhwala ndi kuonjezera mphamvu kapangidwe.Thickener, chotulutsa, galasi fiber, ndi polymerization inhibitor amawonjezera kukhuthala, kukana dzimbiri, kutchinjiriza, komanso kukhazikika kwazinthuzo.Zogulitsa zoterezi zakhala zikugwiritsidwa ntchito m'magawo akuluakulu asanu ndi atatu kuphatikizapo magalimoto ndi magalimoto apamtunda.Pansi pazakale zachitetezo champhamvu, kuteteza chilengedwe, komanso kugwiritsa ntchito mphamvu pang'ono, makampani amagalimoto apereka zofunikira zapamwamba komanso zapamwamba za zida za SMC chifukwa chopepuka.Chomwe chili chofunikira kwambiri pakukula kwaukadaulo wa SMC.

Gwiritsani ntchitomakina osindikizira a hydraulickukanikiza mapepala akamaumba pawiri mankhwala.Zhengxi ndi katswirifakitale ya hydraulic press ku China, kupereka makina osindikizira apamwamba kwambiri.Lumikizanani nafe kuti mumve zambiri.