PVC cov ntaub ntawv ua

Shenzhen Shenchuang Hi-tech Electronics Co., Ltd (SChitec) yog lub tuam txhab ua haujlwm siab uas tshwj xeeb hauv xov tooj accessories ntau lawm thiab muag khoom. Peb cov khoom tseem ceeb muaj xws li kev mus ncig, chargers tsheb, USB cables, fais fab nyiaj hauv tuam txhab nyiaj thiab lwm yam khoom siv digital.Tag nrho cov khoom muaj kev nyab xeeb thiab txhim khu kev qha, nrog cov cim styles.products dhau daim ntawv pov thawj xws li CE, FCC, ROHS, UL, PSE, C-Tick, thiab lwm yam. , Yog tias koj txaus siab rau, koj tuaj yeem tiv tauj ceo@schitec.com ncaj qha.

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PVC cov ntaub ntawv ua

Polyvinyl chloride plastics sib txawv hauv cov duab thiab sib txawv, thiab lawv tuaj yeem ua tiav ntau txoj hauv kev, suav nrog nias, extrusion, txhaj tshuaj, thiab txheej. Lub particle loj, fisheye, pulity ceev, purity, txawv teb chaws, thiab porosity ntawm polyvinyl chloride resin txhua tus muaj cov nyhuv ntawm cov txheej txheem; paste resin yuav tsum xav txog cov viscosity thiab gelation zog ntawm cov muab tshuaj txhuam.

Polyvinyl chloride yog ib qho amorphous polymer nrog me me shrinkage. Ua ntej cov hmoov ua tiav, nws yuav tsum tau preheated kom tshem tawm cov dej, txhim khu cov nyhuv plasticizing thiab tiv thaiv huab cua npuas. Ntxiv mus, PVC yog yooj yim decomposed, tshwj xeeb tshaj yog nyob rau hauv kev sib cuag nrog hlau thiab tooj liab ntawm kub kub (decomposition kub yog 200 degrees). Lub molding kub ntau yog me me, thiab cov khoom siv kub yuav tsum nruj me ntsis tswj. Thaum siv cov ntsia hlau hom txhaj tshuaj thiab lub taub hau ncaj nraim, lub aperture yuav tsum loj kom tiv thaiv cov ces kaum tuag los ntawm stagnation. Lub pwm casting system yuav tsum ntxhib, lub rooj vag seem yuav tsum loj, pwm yuav tsum tau txias, pwm kub yog 30-60 degrees, thiab cov khoom kub yog 160-190.

Hauv qab lub iav hloov pauv kub (Tg, 80 degree C), polyvinyl chloride nyob rau hauv lub xeev iav; ntawm Tg → viscous flow kub (Tf, txog 160 degree C), nws yog elastic heev elasticity, plasticity; ntawm Tf → thermal decomposition kub (Td) Nyob rau hauv lub viscous flow xeev, qhov siab dua qhov kub, qhov yooj yim ntws. Thaum qhov kub siab tshaj Td, PVC decomposes ib tug loj npaum li cas ntawm hydrogen chloride (HCl), thiab cov khoom poob nws cov tshuaj stability thiab lub cev muaj zog, yog li Td yog lub sab sauv txwv kub rau ua. Vim yog lub zog loj inter-molecular ntawm polyethylene, Tf yog siab heev, txawm nyob ze rau qhov decomposition kub, yog li nws yog ib qho tsim nyog yuav tau ntxiv cov yas yas kom txo Tf. Ntawm qhov tod tes, nws tseem yuav tsum tau ntxiv cov stabilizer kom nce Td ntawm PVC thiaj li yuav ua tiav.

Lub iav hloov pauv kub (Tg) tsuas yog cuam tshuam nrog cov qauv ntawm cov saw hlau molecular, thiab muaj kev sib raug zoo me me nrog qhov hnyav molecular. Lub viscous flow kub (Tf) yog qhov kub ntawm qhov macromolecule pib txav, uas cuam tshuam rau qhov hnyav molecular. Qhov loj dua qhov hnyav molecular, qhov siab dua Tf. Yog li ntawd, rau qee qhov kev ua haujlwm (xws li kev txhaj tshuaj molding), nws yog qhov tsim nyog los txo qhov hnyav molecular ntawm resin. Raws li qhov sib txawv ntawm qhov hnyav molecular, lub tsev raug tshem tawm polyvinyl chloride resin muab faib ua 1-7 qib, qhov loj dua tus lej, qhov me me ntawm qhov hnyav molecular. XJ-4 (XS-4) rau XJ-7 (XS-7) hom resins feem ntau yog siv rau hauv kev tsim cov raj tawv, tawv phaj, thiab lwm yam, lwm yam qauv nrog qis molecular hnyav thiab loj molecular hnyav, vim siab dua Tf, yuav tsum tau ntxiv ntau plasticization Tus neeg saib xyuas txo Tf thiab yog li ntawd feem ntau siv nyob rau hauv kev tsim cov khoom muag muag. Polyvinyl chloride nrog qhov nruab nrab ntawm cov txheej txheem polymerization hauv qab 1000 yog hu ua qib qis ntawm polymerization ntawm polyvinyl chloride, uas muaj cov khoom ua haujlwm zoo thiab tuaj yeem muab ntxiv nrog cov yas yas tsawg dua thaum ua, kom cov khoom tsis nrawm vim tsiv teb tsaws ntawm plasticizer. Kev laus. Tsawg-polymerization polyvinyl chloride cov khoom lag luam muaj cov pob tshab zoo thiab tau siv dav hauv cov khoom siv hauv tsev, cov khoom noj thiab cov khoom ntim tshuaj, thiab qhov chaw ntawm cov khoom plexiglass.

Polyvinyl chloride yaj yog cov kua uas tsis yog-Newtonian pseudo. Qhov siab dua tus nqi shear, qhov me dua qhov pom tseeb viscosity thiab qhov kev hloov pauv yog qhov rhiab heev. Thaum qhov kub nce, qhov viscosity tsis txo ntau. Txawm hais tias cov yas qis dua qhov decomposition kub, nws yuav ua kom sov thiab oxidize thiab degrade vim qhov kub thiab txias rau lub sijhawm ntev, uas yuav cuam tshuam rau nws cov kev ua tau zoo. Yog li ntawd, kev txhim kho lub fluidity ntawm polyvinyl chloride yaj yuav tsum tsuas yog xav txog kev nce tus nqi shear (nce lub siab). Qhov tseeb, ua kom lub zog sab nraud txhawb nqa kev txav ntawm macromolecule, uas txo Tf, thiab macromolecule tuaj yeem ntws ntawm qhov kub thiab txias.