isicelo

I-WPC iyinhlanganisela eyenziwe kusetshenziswa amapulasitiki ancibilikayo ashisayo, okuhlanganisa i-polyethylene, i-polypropylene, i-polyvinyl chloride kanye nama-copolymers awo njengama-adhesives, kusetshenziswa impushana yokhuni njengokhuni, utshani bezitshalo zezolimo, igobolondo lesitshalo sezolimo njengezinto zokugcwalisa, ukubunjwa kwe-extrusion noma indlela yokucindezela, indlela yokubumba umjovo.I-hot melt plastic izinto zokusetshenziswa zingasetshenziswa izimboni noma imfucuza yezinto eziphilayo, i-wood powder ingasetshenziswa futhi imfucuza yokucubungula izinkuni, izinkuni ezincane nezinye izinkuni ezisezingeni eliphansi.Ngokombono wokukhiqizwa kwezinto zokusetshenziswa, imikhiqizo yepulasitiki yokhuni inciphisa futhi iqede ukungcoliswa kwemfucuza yepulasitiki, futhi iphinde iqede ukungcoliswa okubangelwa ukushiswa kwezitshalo zezolimo endaweni ezungezile.Ukukhethwa kwefomula yezinto ezibonakalayo kunqubo eyinhlanganisela kubandakanya izici ezilandelayo:

1. Amapholimeri

Amapulasitiki asetshenziswa ekucubunguleni izinhlanganisela zezinkuni-plastic kungaba amapulasitiki e-thermoset kanye ne-thermoplastics, amapulasitiki e-thermoset afana nama-epoxy resins, ama-thermoplastics afana ne-polyethylene (PE), i-polypropylene (PP) ne-polyoxyethylene (PVC).Ngenxa yokungaqini kahle kokushisa kwe-wood fiber, ama-thermoplastic kuphela anamazinga okushisa angaphansi kuka-200 ° C asetshenziswa kabanzi, ikakhulukazi i-polyethylene.Ukukhethwa kwama-polymers epulasitiki kususelwa ikakhulukazi ezicini zemvelo ze-polymer, izidingo zomkhiqizo, ukutholakala kwempahla eluhlaza, izindleko kanye nezinga lokujwayelana nayo.Okufana njengokuthi: i-polypropylene isetshenziswa kakhulu emikhiqizweni yezimoto kanye nemikhiqizo yokuphila kwansuku zonke, i-PVC isetshenziswa kakhulu ekwakheni iminyango ne-Windows, amapaneli okugandaya nokunye.Ukwengeza, izinga lokuncibilika kokuncibilika (i-MFI) lepulasitiki liphinde libe nomthelela othile ezindaweni zezinto ezihlanganisiwe, ngaphansi kwezimo ezifanayo zokucubungula, i-MFI ye-resin iphakeme, ukungenwa okuphelele kwempuphu yezinkuni kungcono, ukusatshalaliswa kwe-powder yokhuni kufana kakhulu, futhi ukungena nokusatshalaliswa kwe-powder yokhuni kuthinta izakhiwo zemishini yezinto ezihlanganisiwe, ikakhulukazi amandla omthelela.

2. Izithasiselo

Njengoba impushana yokhuni inokumuncwa okuqinile kwamanzi kanye ne-polarity eqinile, futhi ama-thermoplastics amaningi awawona ama-polar kanye ne-hydrophobic, ukuhambisana phakathi kwalokhu okubili kubi, futhi amandla okuhlanganisa esibonakalayo mancane kakhulu, futhi izithasiselo ezifanele zivame ukusetshenziselwa ukuguqula ubuso be-polymer. kanye nempushana yokhuni ukuze kuthuthukiswe ukuxhumana phakathi kwempushana yokhuni nenhlaka.Ngaphezu kwalokho, umphumela wokuhlakazeka wempushana yokhuni egcwala kakhulu ku-thermoplastics encibilikisiwe ayilungile, imvamisa isesimweni sokuhlanganisa, okwenza ukugeleza kwencibilike kube kubi, ukucubungula i-extrusion kunzima, futhi ama-ejenti okwelapha angaphezulu adinga ukwengezwa ukuze kuthuthukiswe ukugeleza ukuze kube lula. ukubunjwa kwe-extrusion.Ngesikhathi esifanayo, i-matrix yepulasitiki nayo idinga ukwengeza izithasiselo ezihlukahlukene ukuze ithuthukise ukusebenza kwayo kokucubungula kanye nokusetshenziswa komkhiqizo oqediwe, ithuthukise amandla okubopha phakathi kwempushana yokhuni kanye ne-polymer kanye nezakhiwo zemishini yezinto ezihlanganisiwe.Izithasiselo ezisetshenziswa kakhulu zifaka izigaba ezilandelayo:

a) I-ejenti yokuhlanganisa ingakhiqiza ukuxhumana okuqinile phakathi kwepulasitiki nokhuni lwempuphu;Ngesikhathi esifanayo, kunganciphisa ukumuncwa kwamanzi kwempushana yokhuni futhi kuthuthukise ukuhambisana nokuhlakazwa kwempuphu yezinkuni nepulasitiki, ngakho-ke izakhiwo zemishini yezinto ezihlanganisiwe zithuthukiswa kakhulu.Ama-coupling agents asetshenziswa kakhulu yilawa: isocyanate, isopropylbenzene peroxide, i-aluminate, i-phthalates, i-silane coupling agent, i-maleic anhydride modified polypropylene (MAN-g-PP), i-ethylene-acrylate (EAA).Ngokuvamile, inani elingeziwe le-ejenti yokuhlanganisa liyi-1wt% ~ 8wt% yenani elingeziwe lempushana yokhuni, njenge-ejenti yokuhlanganisa i-silane ingathuthukisa ukunamathela kwepulasitiki nempushana yokhuni, ithuthukise ukuhlakazwa kwempushana yokhuni, inciphise ukumuncwa kwamanzi, kanye ne-alkali. Ukwelashwa kwe-powder yokhuni kungathuthukisa kuphela ukuhlakazwa kwe-powder yokhuni, akukwazi ukuthuthukisa ukumuncwa kwamanzi kwe-wood powder kanye nokunamathela kwayo ngepulasitiki.Kumele kuqashelwe ukuthi i-ejenti yokuhlanganisa i-maleate kanye ne-stearate lubricant kuzoba nokusabela okunengekayo, okuzoholela ekwehleni kwekhwalithi yomkhiqizo kanye nesivuno uma kusetshenziswa ndawonye.

b) I-Plasticizer Kwamanye ama-resin ane-high glass transition temperature kanye ne-melt flow viscosity, njengokuqina kwe-PVC, kunzima ukucubungula uma kuhlanganiswe ne-wood powder, futhi ngokuvamile kuyadingeka ukwengeza i-plasticizer ukuze kuthuthukiswe ukusebenza kwayo kokucubungula.Isakhiwo samangqamuzana e-Plasticizer siqukethe izakhi zofuzo ze-polar nezingezona ze-polar, ngaphansi kwesenzo se-shear yokushisa ephezulu, ingangena ku-polymer molecular chain, ngokusebenzisa izakhi zofuzo ze-polar zidonselana ukuze zenze uhlelo olufanayo noluzinzile, kanye nokufakwa kwayo okude okungeyona i-polar. yenza buthaka ukukhangana kwama-molecule e-polymer, ukuze ukucubungula kube lula.I-Dibutyl phthalate (DOS) namanye ama-plasticizers avame ukungezwa ezinhlanganisela zezinkuni-plastiki.Isibonelo, ku-PVC wood powder composite material, ukungezwa kwe-plasticizer DOP kunganciphisa izinga lokushisa lokucubungula, ukunciphisa ukubola kanye nentuthu ye-powder yokhuni, futhi kuthuthukise amandla aqinile wezinto eziyinhlanganisela ngenkathi ukuphakama ngesikhathi sekhefu kukhuphuka ngokunyuka kwe- okuqukethwe kwe-DOP.

c) Izithambisi Izithako zokhuni-zepulasitiki zivame ukudinga ukwengeza izinto zokugcoba ukuze kuthuthukiswe ukuncibilika kanye nekhwalithi yangaphezulu yemikhiqizo ekhishiwe, kanye nezinto zokugcoba ezisetshenziswayo zihlukaniswa zibe izinto zokuthambisa zangaphakathi nezithambisi zangaphandle.Ukukhethwa kwe-lubricant yangaphakathi kuhlobene ne-matrix resin esetshenzisiwe, okumele ihambisane kahle ne-resin ekushiseni okuphezulu, futhi ikhiqize umphumela othize we-plasticizing, ukunciphisa amandla okuhlangana phakathi kwama-molecule e-resin, yenza buthaka ukungqubuzana phakathi kwama-molecule, ukuze kuncishiswe i-viscosity encibilikayo ye-resin futhi kuthuthukiswe ukuncibilika kokuncibilika.I-lubricant yangaphandle empeleni idlala indima ye-interface lubrication phakathi kwe-resin ne-wood powder ekucubunguleni ukubumba kwepulasitiki, futhi umsebenzi wayo oyinhloko ukukhuthaza ukusheleleka kwezinhlayiya ze-resin.Ngokuvamile okokugcoba kuvame ukuba nezinto zokugcoba ngaphakathi nangaphandle.Izinto zokugcoba zinomthelela othize empilweni yesevisi yesikhunta, umphongolo nesikulufu, amandla okukhiqiza we-extruder, ukusetshenziswa kwamandla enqubweni yokukhiqiza, ukuphela komkhiqizo kanye nokusebenza komthelela ophansi wephrofayili.Izithambisi ezivame ukusetshenziswa yilezi: i-zinc stearate, i-ethylene bisfatty acid amide, i-polyester wax, i-stearic acid, i-lead stearate, i-polyethylene wax, i-parafini wax, i-polyethylene oxidized wax nokunye.

d) I-Colorant Ekusetshenzisweni kwezinto ezihlanganisiwe zezinkuni-plastic, into exazululekayo kumpushana wokhuni kulula ukuthuthela ebusweni bomkhiqizo, ukuze umkhiqizo ukhishwe umbala, futhi ekugcineni ube grey, imikhiqizo ehlukene endaweni ethile yokusetshenziswa, kodwa iphinde ikhiqize amabala amnyama noma amabala okugqwala.Ngakho-ke, ama-colorants nawo asetshenziswa kabanzi ekukhiqizeni izinto ezihlanganisiwe zezinkuni-plastiki.Ingenza umkhiqizo ube nombala ofanayo nozinzile, futhi i-decolorization ihamba kancane.

e) I-ejenti enegwebu ehlanganisiwe yezinkuni-plastic inezinzuzo eziningi, kodwa ngenxa yenhlanganisela ye-resin kanye nempushana yokhuni, i-ductility yayo kanye nokumelana nomthelela kuyancishiswa, impahla iyaphuka, futhi ukuminyana kukhulu cishe izikhathi ezi-2 kunokhuni lwendabuko. imikhiqizo, ekhawulela ukusetshenziswa kwayo okubanzi.Ngenxa yesakhiwo esihle se-bubble, i-foamed wood-plastic composite ingadlula ithiphu lokuqhekeka futhi ivimbele ngempumelelo ukwanda kokuqhekeka, ngaleyo ndlela ithuthukise kakhulu ukumelana komthelela kanye ne-ductility yezinto, futhi inciphise kakhulu ukuminyana komkhiqizo.Kunezinhlobo eziningi zezinto ezifuthayo, futhi ikakhulukazi zimbili ezivame ukusetshenziswa: ama-endothermic blowing agents (njenge-sodium bicarbonate NaHCO3) nama-exothermic blowing agents (azodibonamide AC), ukuziphatha kwawo kokubola okushisayo kwehlukile, futhi anemiphumela ehlukile ku-viscoelasticity kanye ifomu le-polymer elicwebezelayo, ngakho-ke i-ejenti efuthayo efanele kufanele ikhethwe ngokuvumelana nezidingo zokusetshenziswa kwemikhiqizo.

f) Ukusetshenziswa kwezinzinzisi ze-UV nezinye iziqinisi ze-UV nakho sekuthuthuke ngokushesha ngokuthuthukiswa kwezidingo zabantu zekhwalithi nokuqina kwezinhlanganisela zokhuni-zepulasitiki.Ingenza i-polymer ezintweni eziyinhlanganisela ingalulazi noma izakhiwo zemishini zehle.Okuvame ukusetshenziswa ama-blocked amine light stabilizer nama-absorber ultraviolet.Ngaphezu kwalokho, ukuze wenze izinto ezihlanganisiwe zingakwazi ukugcina ukubukeka okuhle nokusebenza okuphelele, ngokuvamile kuyadingeka ukwengeza ama-antibacterial agents, futhi ukukhethwa kwama-antibacterial agents kufanele kucabangele uhlobo lwempuphu yezinkuni, inani lokwengeza, amabhaktheriya imvelo yokusetshenziswa kwempahla eyinhlanganisela, okuqukethwe kwamanzi omkhiqizo nezinye izici.I-Zinc borate, isibonelo, iyalondoloza kodwa hhayi ulwelwe.

Ukukhiqizwa nokusetshenziswa kwezinto ezihlanganisiwe zokhuni-plastiki ngeke kukhiphe izinto eziguquguqukayo eziyingozi empilweni yomuntu endaweni ezungezile, futhi imikhiqizo yezinkuni-plastiki ngokwayo ingaphinda isetshenziswe futhi isetshenziswe kabusha, ngakho-ke imikhiqizo yezinkuni-plastiki iwuhlobo olusha lokuvikelwa kwemvelo okuluhlaza. imikhiqizo, engaba ukuzihlanza kwemvelo futhi ibe nethuba elibanzi lokuthuthuka