Qee cov Additives Feem ntau siv hauv Ntoo Plastic Composites

Coupling tus neeg sawv cev: nws tuaj yeem tsim muaj zog interfacial bonding ntawm yas thiab ntoo hmoov; Nyob rau tib lub sijhawm, nws tuaj yeem txo cov dej nqus ntawm cov hmoov ntoo thiab txhim kho kev sib raug zoo thiab kev tawg ntawm cov hmoov ntoo thiab cov yas, yog li cov khoom siv ntawm cov khoom sib xyaw tau zoo tuaj. Feem ntau siv cov coupling agents mas muaj xws li isocyanate, cumene peroxide, aluminate, phthalate, silane coupling tus neeg saib xyuas, maleic anhydride hloov polypropylene (txiv neej-g-pp), ethylene acrylate (EAA). Feem ntau, qhov ntxiv ntawm tus neeg sawv cev sib txuas yog 1wt feem pua ​​~ 8wt feem pua ​​​​ntawm cov hmoov ntoo ntxiv. Piv txwv li, silane coupling tus neeg sawv cev tuaj yeem txhim kho qhov adhesion ntawm cov yas thiab ntoo hmoov, txhim kho qhov tawg ntawm cov hmoov ntoo thiab txo cov dej nqus. Txawm li cas los xij, kev kho alkaline ntawm cov hmoov ntoo tuaj yeem txhim kho qhov tawg ntawm cov hmoov ntoo, tab sis tsis tuaj yeem txhim kho cov dej nqus ntawm cov hmoov ntoo thiab nws cov adhesion nrog yas. Nws yuav tsum raug sau tseg tias tus neeg sawv cev ntawm cov txiv neej sib txuas thiab cov roj ntsha stearate yuav muaj kev sib koom ua ke, thiab thaum siv ua ke, cov khoom zoo thiab cov khoom tsim tawm yuav raug txo.

Plasticizer: rau qee cov resins nrog cov iav hloov pauv kub thiab yaj ntws viscosity, xws li tawv PVC, nws yog ib qho nyuaj rau txheej txheem thaum compounding nrog ntoo hmoov. Plasticizer feem ntau ntxiv los txhim kho nws cov kev ua tau zoo. Cov qauv molecular ntawm plasticizer muaj cov noob polar thiab non-polar. Nyob rau hauv qhov kev txiav txim ntawm high-temperature shear, nws muaj peev xwm nkag mus rau hauv lub polymer molecular saw thiab tsim ib tug uniform thiab ruaj khov system los ntawm kev sib nrig sib attraction ntawm polar noob. Qhov ntxig ntawm nws qhov ntev uas tsis yog-polar molecules tsis muaj zog rau kev sib nrig sib attraction ntawm polymer molecules, yog li ua kom yooj yim. Cov plasticizers feem ntau siv hauv cov ntoo yas sib xyaw yog dibutyl phthalate (DOS) thiab lwm yam. Piv txwv li, ntxiv plasticizer DOP rau PVC ntoo hmoov sib xyaw tuaj yeem txo qhov kev ua haujlwm kub, txo qhov decomposition thiab pa luam yeeb ntawm cov hmoov nplej, thiab txhim kho lub zog tensile ntawm cov khoom sib xyaw txo qis thiab qhov elongation ntawm kev tawg yuav nce ntxiv nrog cov ntsiab lus ntawm plasticizer DOP.

Lubricants: ntoo yas composites feem ntau yuav tsum tau ntxiv lubricants los txhim kho lub yaj fluidity thiab nto zoo ntawm cov khoom extruded. Cov roj nplua nyeem siv tau muab faib ua cov roj lubricants sab hauv thiab cov lubricants sab nraud. Kev xaiv ntawm cov roj nplaum sab hauv yog cuam tshuam nrog cov matrix resin siv. Nws muaj kev sib raug zoo nrog cov resin ntawm qhov kub thiab txias thiab muaj cov nyhuv plasticizing, txo cov cohesion zog ntawm cov molecules hauv resin thiab tsis muaj zog ntawm kev sib txhuam ntawm cov molecules, thiaj li txo cov yaj viscosity ntawm cov resin thiab txhim kho cov yaj fluidity. Lub lubricant sab nraud ua tau raws li qhov sib cuam tshuam lubrication ntawm resin thiab ntoo hmoov hauv cov txheej txheem yas molding. Nws lub luag haujlwm tseem ceeb yog los txhawb qhov zawv zawg ntawm cov khoom siv. Feem ntau lub lubricant muaj ob qho tib si sab hauv thiab sab nraud lubricating zog. Lub lubricant muaj qee yam cuam tshuam rau kev ua haujlwm ntawm lub neej tuag, chim thiab ntsia hlau, lub peev xwm ntau lawm ntawm extruder, kev siv lub zog hauv cov txheej txheem ntau lawm, cov khoom tiav ntawm cov khoom thiab qhov kub ntawm qhov kev ua tau zoo ntawm qhov profile. Cov roj nplua nyeem feem ntau yog: zinc cholate, ethylene ob fatty acid amide, polyester wax, stearic acid, lead stearate, polyethylene wax, paraffin, oxidized polyethylene wax, thiab lwm yam.

Thaum siv cov xim pleev xim rau hauv cov ntaub ntawv yas ntoo, cov tshuaj solvable hauv cov hmoov ntoo yog yooj yim rau migrate rau saum npoo ntawm cov khoom, ua rau cov khoom décolour thiab tig grey. Cov khoom sib txawv kuj tseem yuav tsim cov pob dub los yog xeb hauv qee qhov kev siv. Yog li ntawd, colorants kuj tau lug siv nyob rau hauv zus tau tej cov ntoo yas composites. Nws tuaj yeem ua rau cov khoom muaj xim zoo ib yam thiab ruaj khov, thiab decolorization qeeb.

Foaming agent: ntoo yas composite muaj ntau qhov zoo, tab sis vim yog kev sib xyaw ntawm cov resin thiab ntoo hmoov, nws cov ductility thiab kev cuam tshuam tsis kam raug txo, cov khoom yog nkig, thiab qhov ceev yog ze li ntawm 2 npaug ntau dua li cov khoom siv ntoo, uas. txwv nws txoj kev siv dav. Txawm li cas los xij, foamed ntoo yas composite tuaj yeem dhau qhov tawg thiab tiv thaiv qhov tawg ntawm qhov nthuav dav vim nws cov qauv ntawm tes zoo, yog li txhim kho qhov cuam tshuam thiab ductility ntawm cov khoom thiab txo qhov ntom ntawm cov khoom. Muaj ntau hom tshuab tshuab, thiab feem ntau muaj ob hom kev siv: endothermic blowing agent (xws li sodium bicarbonate NaHCO3) thiab exothermic blowing agent (Azodicarbonamide AC). Lawv tus cwj pwm thermal decomposition txawv thiab muaj qhov sib txawv ntawm viscoelasticity thiab foaming morphology ntawm polymer yaj. Yog li ntawd, cov tshuab tshuab tsim nyog yuav tsum raug xaiv raws li kev siv cov khoom siv.

Daim ntawv thov ntawm UV stabilizers thiab lwm yam UV stabilizers kuj txhim kho sai nrog kev txhim kho qhov zoo thiab ua haujlwm ntev ntawm cov ntoo yas sib xyaw. Nws tuaj yeem ua rau cov polymer hauv cov khoom sib xyaw tsis degrade lossis txo cov khoom siv kho tshuab. Hindered amine teeb stabilizers thiab ultraviolet absorbers feem ntau yog siv. Tsis tas li ntawd, txhawm rau kom muaj qhov zoo nkauj thiab ua haujlwm ntawm cov khoom sib xyaw, nws yog ib qho tsim nyog yuav tau ntxiv cov tshuaj fungicides. Kev xaiv cov fungicides yuav tsum xav txog qhov ntau thiab tsawg ntawm cov hmoov ntoo, fungi nyob rau hauv kev siv ib puag ncig ntawm cov khoom sib xyaw, cov ntsiab lus dej ntawm cov khoom thiab lwm yam. Piv txwv li, zinc borate tuaj yeem tiv thaiv corrosion tab sis tsis yog algae.