Kuumbwa uye Kushandiswa kweSheet Molding Compound

Sheet molding compound inoreva unsaturated polyester resin semuviri mukuru, kuwedzera kurapa, mold release agent, filler, low shrinkage agent, thickener, etc. Molding compound yakavharwa ne polyethylene (PE) firimu.Iri bepa rinonyanya kutsanangura muchidimbu kuumbwa uye kupatsanura mashandisirwo eSMC.

Sheet inoumbwa yakanyorwa's composition

SMC inoumbwa neunsaturated polyester resin, crosslinking agent, initiator, filler, thickener, release agent, glass fiber, uye polymerization inhibitor.Iwo mana ekupedzisira mapoka ari kunyanya kune ekuwedzera viscosity, corrosion resistance, insulation, uye kugadzikana kwechigadzirwa.

1. Unsaturated polyester resin uye crosslinking agents ndiwo muviri mukuru we SMC.Unsaturated polyester resins inowanzoitwa polycondensed kubva kune unsaturated dicarboxylic acids (kana anhydrides), saturated dicarboxylic acids (kana anhydrides), uye polyols.Iine mamwe maitiro emagetsi uye simba, uye simba remukati rakafanana.Iyo crosslinking agent inonyanya kuve styrene.Pashure pokunge vaviri vacho vari kuyambuka, ndezvekunyora kwepasi rekuporesa kwechigadzirwa, icho chinotamba chinzvimbo chekubatana, kutsigirwa, kutenderwa, uye kudzivirira.

2. Iyo initiator inokonzeresa kuti resin uye crosslinker irape uye igadzire mune resin paste nhanho.Basa rayo rinonyanya kuita resin uye chisungo chechipiri mumuchinjikwa-kubatanidza monoma yakadai se styrene copolymerize kuitira kuti SMC inogona kusimba uye kuumbwa mumhango ye mold.

3. Iyo yekuzadza inotora zvinopfuura chikamu chimwe muzvitatu chepepa rekugadzira pepa uye inogona kugadzirisa viscosity yemuumbi wekuumba.Iyo inowanzoda kuve nehunhu hwekudzika kwakananga giravhiti, yakaderera mafuta adsorption kukosha, mashoma pores, corrosion resistance, uye mutengo wakaderera.Izvo zvinowanzo shandiswa zvekuzadza zvikamu zvinonyanya CaCO3, Al(OH)3, zvichingodaro.

4. Makobvu anopa SMC yakakwirira-viscosity, isina-namira pfuma.Kugadzirira kweshizha uye yakawanda yekuumba makomisheni kunoda yakaderera viscosity yeresin kuti ifambise kupindira kwegirazi fiber uye kuzadza neresin.Uye compression molding inoda yakakwira viscosity.Naizvozvo, zvinodikanwa kuti uwedzere thickkener isati yabatanidza maitiro ekuumba kushandura viscosity yakaderera yegirazi fiber kusakwana mune yakakwira viscosity isina kunamira.

5. Iyo yekuburitswa Agent inodzivirira iyo pepa inoumbwa yakanyorwa kubva kune yakafarirwa neiyo simbi mold pamusoro.Iyo yekuburitsa mumiririri inogona kudzivirira iyo isina unsaturated polyester resin kubva pakubatana nepamusoro pesimbi mold panguva yepurasitiki process yemusanganiswa weresin.Kunyanya-refu-cheni mafuta asidhi kana munyu anomiririrwa zinc stearate.Kushandisa zvakanyanya kuchaderedza nyore nyore kushanda kwechigadzirwa.Iko kushandiswa kwese kunotora 1 ~ 3% yechigadzirwa chakazara kuti ive nechokwadi chemhando yechigadzirwa.

6. Girazi fibers inogona kukwidziridza kusadzivirirwa kwecorrosion uye insulation zvimiro zveSMC.Sheet molding compound inowanzosarudza yakachekwa girazi fiber mats sechinhu chekusimbisa.Kushandisa zvakanyanya kuchaita kuti chigadzirwa chive nyore, uye kushandiswa kwechidimbu chiduku hakuzove nekusimbisa kwakajeka kwechigadzirwa.Iyo yakawanda inoshandiswa ndeye 20%.Nenzira iyi, chigadzirwa chinogona kuzosangana panguva imwe chete yekuwedzera kuumbwa uye kumanikidza kuumba.

7. Inhibitor inowedzera kugadzikana kweSMC uye inowedzera nguva yekuchengetedza.Sezvo iyo initiator styrene ichizoora zvishoma nezvishoma, zvichikonzera polymerization yeresin, kuwedzera huwandu hwakakodzera hwemahara radical scavenger (polymerization inhibitor) inogona kudzikisa kukurumidza kwekuora kwe styrene uye kurebesa nguva yayo yekuchengetedza.Inhibitors inowanzova benzoquinones uye polyvalent phenolic compounds.

Kushandiswa kweshizha kuumbwa zvigadzirwa

SMC ine mabhenefiti ekuita kwakanakisa kwemagetsi, yakasimba corrosion resistance, lightweight, easy and flexible engineering design, etc. Michina yayo inofananidzwa nezvimwe zvinhu zvesimbi.Naizvozvo, inoshandiswa zvakanyanya muminda masere seindasitiri yemotokari, mota dzechitima, kuvaka, magetsi emagetsi, uye kutaurirana (tafura 1).

Pakati pavo, mukutanga, yainyanya kushandiswa muchimiro chekudzivirira mapuranga muminda yekuvaka, midziyo yemagetsi, uye kutaurirana, uye tekinoroji yakakura.Yakazoshandiswa muindasitiri yemotokari kutsiva chikamu chesimbi nealuminium alloy zvinhu zvemuviri kuderedza huremu hwemotokari.

Pasi pemashure ekuchengetedza simba razvino uye kuderedzwa kwekuburitsa uye kuvandudzwa kwemotokari nyowani dzesimba, tekinoroji yezvigadzirwa zvemotokari inoramba ichikura yakananga kuremerwa uye yemhando yepamusoro.Kusvika ikozvino, kushandiswa kwezvinhu zveSMC zvinogona kuonekwa kwese kwese muhupenyu hwezuva nezuva.Inotaridzwa mukutaurirana kusina waya, kuputika-kuvharwa kwemagetsi ekuvhara, zvinhu zvekudzivirira pasi, dzimba dzekugezera, uye nzvimbo dzenjanji dzinomhanya.

Tafura 1 Masere makuru ekushandisa uye kupatsanura minda yeSMC zvinhu

Pfupisa

Iyo isina kusimbiswa polyester resin, crosslinking mumiririri, anotanga, uye filler mune iyo sheet inoumbwa companded inoisa chimiro chechigadzirwa uye kuwedzera simba rerudzi.Thickener, osunungurwa mumiririri, girazi fiber, uye polmerization inhibitor inowedzera viscosity, Corrosion kuramba, insulation, uye kugadzikana kwechimiro kune chigadzirwa.Zvigadzirwa zvakadaro zvakaiswa muminda masere makuru kusanganisira iyo mota indasitiri uye mota dzechitima.Pasi pemamiriro azvino ekuchengetedza simba, kuchengetedza kwezvakatipoteredza, uye kushomeka kwesimba rekushandisa, iyo indasitiri yemotokari yakaisa mberi uye yepamusoro zvinodiwa zveSMC zvinhu nekuda kwehuremu hwazvo zvinodiwa.Ndeipi iyo huru kutyaira simba rekusimudzira kweSMC tekinoroji.

Shandisa iyocomposite hydraulic press muchinakudzvanya sheething kuumbwa zvigadzirwa zvezvigadzirwa.Zhengxi inyanzvihydraulic press fekitori muChina, kupa michina yemhando yepamusoro.Bata isu kuti tiwane ruzivo.