Cov nyhuv ntawm cov tshuaj antioxidants rau plaub lub zog ntawm polypropylene (PP)

Cov tshuaj antioxidant ntxiv rau cov khoom siv yas, ua kom zoo tiv thaiv lossis txo qhov nrawm ntawm cov tshuaj tiv thaiv thermal oxidation ntawm cov yas macromolecules, txhim kho qhov kub ntawm cov khoom siv yas, ncua qhov kev puas tsuaj ntawm cov khoom siv yas, cov txheej txheem laus, txuas lub neej kev pabcuam ntawm cov khoom yas, cov khoom yas los txhim kho tus nqi ntawm cov khoom siv yas ntxiv.

Cov tshuaj antioxidants yog cov khoom siv ntxiv uas siv ntau tshaj plaws hauv cov yas. Ib qho ntawm cov ntsiab lus siv dav tshaj plaws yog hais txog kev siv cov tshuaj antioxidants hauv txhua theem sib txawv ntawm cov yas polymerization thiab synthesis, granulation, khaws cia, ua tiav, thiab siv. Qhov thib ob yog cov ntsiab lus siv dav tshaj plaws, hais txog lub ntiaj teb niaj hnub no tau tshwm sim hauv ntau yam qauv molecular ntawm cov khoom siv yas, xws li polyethylene, polypropylene, styrene polymers, engineering plastics, modified plastics thiab lwm yam khoom siv, kev siv cov tshuaj antioxidants hauv feem ntau hom khoom siv yas. Peb cov khoomyas yeeb nkab extrusion kabyog tsim rau kev kub ceev extrusion ntawm HDPE, PP thiab lwm yam yeeb nkab polyolefin.

Cov tshuaj antioxidants yas uas siv ntau feem ntau muab faib ua plaub pawg raws li cov qauv molecular thiab cov txheej txheem ntawm kev ua haujlwm: hindered phenols, phosphite, thio thiab compound.

Cov yam tseem ceeb uas cuam tshuam rau cov tshuaj antioxidants ntawm cov ntaub ntawv polymeric
Qhov kev xaiv ntawm cov tshuaj antioxidant hauv cov polymers yuav tsum tau soj ntsuam thiab txheeb xyuas qhov tsim nyog, thiab vim nws yog los tshuaj xyuas nws cov kev ua tau zoo ntawm daim ntawv thov, nws yog qhov tsim nyog los tshuaj xyuas cov kev hloov pauv ntawm kev ua tau zoo ntsig txog nws ntxiv rau hauv polymer. Rau cov ntaub ntawv polymeric polypropylene, vim lawv tus kheej cov yam ntxwv, cov khoom hauv qab no feem ntau raug tshuaj xyuas.

01 Cov ntsuas yaj lossis viscosity
Qhov ntsuas yaj yog ib qho cim qhia tseem ceeb ntawm kev ua haujlwm ntawm polypropylene resin, thiab txoj kev ntsuas yaj feem ntau yog siv los ntsuas qhov ruaj khov ntawm cov khoom siv polymeric uas tiv thaiv antioxidant. Qhov hloov pauv ntawm cov ntsuas yaj ua ntej thiab tom qab ua tiav, qhov kev ruaj khov ntawm cov khoom siv yuav phem dua. Yog li ntawd, qhov kev hloov pauv ntawm cov ntsuas yaj ntawm lub tshuab antioxidant stabilizer tom qab ntau qhov extrusions raug kuaj xyuas.

02 Cov Ntawv Qhia Daj
Polypropylene nyob rau hauv cov txheej txheem, nws yooj yim rau thermal laus phenomenon, qhov ntxiv ntawm cov tshuaj antioxidant tseem ceeb inhibition ntawm polypropylene degradation tib lub sijhawm tsim cov quinone chromophores, yog li cov khoom xim daj. Yog li ntawd, polypropylene stabilized system nrog rau kev ntxiv ntawm antioxidants, tom qab ob peb extrusions nrog qhov hloov pauv ntawm cov ntsuas daj los ntsuas qhov cuam tshuam ntawm antioxidants rau polypropylene processability.

03 Lub sijhawm ua kom oxidation
Lub sijhawm oxidation induction yog lub sijhawm rau cov polymer los cuam tshuam nrog oxygen hauv chain auto-oxidation nyob rau hauv qee yam mob thiab qhia tias nws yooj yim npaum li cas rau polypropylene los cuam tshuam nrog oxygen ntawm qee qhov kub (200 ° C). Lub sijhawm oxidation induction loj dua, qhov system ua haujlwm tau zoo dua hauv kev tiv thaiv kev tsim cov free radicals ntawm qhov kub siab. Thaum cov free radicals raug tsim hauv polypropylene, oxygen raug nqus sai sai thiab cov tshuaj tiv thaiv chain auto-oxidation tshwm sim. Plaub lub tshuab antioxidant stabilization tau sim ntawm DSC nrog polypropylene hmoov tom qab thawj zaug extrusion ntawm cov pellets rau lub sijhawm oxidation induction, thiab cov txiaj ntsig tau pom hauv Rooj 3.

04 Lub sijhawm ntev kub thiab oxygen resistant laus
Lub luag haujlwm tseem ceeb ntawm cov khoom yas yog tiv thaiv kev laus los ntawm cua sov thiab oxygen, tiv thaiv kev laus los ntawm UV lossis lub teeb yog kev txhim kho ntxiv rau lub luag haujlwm tseem ceeb. Rau cov khoom yas hloov kho uas siv sab nraum zoov, kev sib xyaw ua ke ntawm cov tshuaj antioxidant tsim nyog thiab kev ntxiv cov tshuaj ntxiv rau hauv lub teeb stabilization system tuaj yeem txhim kho cov nyhuv ntawm lub teeb stabilization mus sij hawm ntev lossis cov nyhuv ntawm cov khoom.

Cov ntaub ntawv sim saum toj no qhia tau hais tias cov kab ke antioxidant sib txawv muaj cov teebmeem sib txawv rau cov ntsuas yaj lossis viscosity, cov ntsuas daj, lub sijhawm oxidation induction, thiab lub sijhawm ntev thermal oxygen laus ntawm cov khoom. Cov polymers xaiv hom kab ke antioxidant, ntxiv rau cov hom ib txwm muaj, cov khoom xav tau sib txawv, cov cwj pwm ntawm cov neeg ua haujlwm, cov chaw ntawm cov channel, thiab lwm yam yuav cuam tshuam rau tib neeg xaiv, tab sis xaiv qhov antioxidant tsim nyog tshaj plaws, tib neeg yuav tsum txuas ntxiv mus sim thiab xyaum ua ntau lawm, tab sis kuj cia siab rau cov neeg ua haujlwm tshawb fawb thiab kev tshaj lij los tsim cov tshuaj antioxidants tshiab.

Raws li cov neeg ua haujlwm hauv kev lag luam polymer, thaum ua kev tshawb fawb txog kev tsim cov tshuaj, lawv yuav tsum xaiv cov tshuaj antioxidants thiab cov tshuaj antioxidant sib xyaw ua ke los ntawm ntau qhov kev sim los tsim cov ntaub ntawv tsim nyog.

Jwell tau tsim muaj nyob rau hauv 1997, Tuam Tshoj Plastics Machinery Industry Association tus lwm thawj coj chav tsev, yas extrusion khoom, tshuaj fiber spinning tiav cov khoom siv manufacturers. Peb muaj ntau yam khoom, xws liyas recycling tshuabthiabyeeb nkab extrusion tshuab, thiab lwm yam. Yog tias koj xav tau, thov hu rau peb lub tshuab ua ntawv phaj extrusion.