Yog li cas vaj tso nyob rau hauv PVC thiab vaj tso nyob rau hauv PVC uas tau siv lawm yuav ua rau muaj qhov "dripping" (muaj dej tsuas) rau hauv qhov ntsiag ntawm cov khoom?

Thaum kawm thiab tsim PVC cov khoom, ntau tus neeg siv khoom yuav pom qhov teeb meem uas yuav tshwm sim rau lawv: thaum tsim PVC cov khoom zoo li cov kab, lub qhob, cov ntawv pov, los yog cov ntawv pov, qhov "tso" lossis "ntawv tso" yuav tshwm sim rau hauv qab ntawm cov khoom uas tau tsim lawm. Ntau tus neeg siv khoom kuj hais tias thaum lawv siv cov khoom tshuaj tshuaj tshuaj rau tshem cov khoom tshiab ua ntej, thiab tswj cov khoom tshiab thiab cov khoom pab rau PVC raws li qhov tswj hwm, qhov hauv qab ntawm cov khoom uas tau tsim lawm yuav muaj qhov xav tias muaj qhov tshuaj tshuaj lossis qhov tshuaj tshuaj, lossis muaj qhov tshuaj tshuaj leej twg uas yuav tshwm sim, uas yuav tshwm sim rau qhov hauv qab, qhov kev xaiv, thiab qhov ua haujlwm ntawm cov khoom. Thaum qhov teeb meem no nyuaj dua, nws yuav tshwm sim rau qhov tshem cov khoom, ua rau nce qhov siab ntawm kev tsim khoom thiab tshwm sim rau qhov kev xa khoom.

Txawm li cas los xij, qhov "tso tso" no uas poob ntawm cov khoom PVC rau hauv qhov kev tsim thiab siv yog tsis tau txais rau qhov "ntsuab tso" nyob rau hauv qhov kev ua haujlwm tseem ceeb, thiab tsis yog los ntawm qhov tsis ua kom sov lawm ntawm cov khoom sib xyaw rau ntau yam. Nws yog qhov teeb meem ntawm qhov pob ntawv uas muaj nyob rau hauv kev tsim PVC, uas lub tsev kev tsim kuj hu nws ua qhov kev tshuaj tshuaj , qhov kev tshuaj tshuaj  thiab qhov kev tshuaj tshuaj ntawm pob ntawv khoom . Qhov teeb meem no tsis yog txaus rau kev tsim thiab kuj sib npog nrog qhov hom ntawm cov khoom sib xyaw, qhov kev sib npog ntawm cov khoom sib xyaw, thiab qhov xwm txheej hauv qhov kev tsim. Nws puas muaj nyob rau hauv qhov kev tsim ntawm PVC resin, tias nyob rau hauv qhov kev siv cov khoom PVC uas tau siv lawm (cov khoom uas tau siv lawm), vim tias cov khoom uas tau siv lawm muaj qhov kev sib npog ntau dua, uas yog qhov cuam tshuam rau qhov teeb meem no.

Lub tseem ceeb no yog qhov tseem ceeb uas cov neeg siv tau txais kev hlub tshuaj, xav tias nws yog qhov uas muaj kev cuam tshuam los ntawm qhov ntau ntawm cov khoom siv, thiab ces lawv tsuas xav nyob rau lub tswv yim ntawm kev ua kom sov cov khoom siv, tab sis lawv tsis pom tias muaj lwm qhov tseem ceeb uas tuaj yeem cuam tshuam, thiab ces qhov teeb meem tsis tau raws qhov tseem ceeb. Rau qhov kev pab cov neeg siv kom paub thiab raws qhov teeb meem no raws qhov tseem ceeb, kom tsis tau loss ntawm kev ua haujlwm, thiab kom zoo dua qhov khoom thiab kev ua haujlwm, peb yuav suav nrog qhov tseem ceeb ntawm "qhov tshuaj" uas muaj nyob rau hauv qhov ntawm cov khoom PVC, thiab peb yuav qhia tias qhov tseem ceeb uas cuam tshuam rau qhov teeb meem no, kom pab cov neeg siv raws qhov teeb meem no raws qhov tseem ceeb.

· Qhov teeb meem ntawm cov khoom PVC

① Cov khoom siv uas tsis tau ua kom zoo

Cov monomer uas tsis tau siv (VCM), cov oligomer los yog cov plasticizer uas tseem muaj nyob rau hauv kev tsim PVC resin yuav tshuab mus rau hauv qhov chaw ntawm cov khoom thaum kawm nyias los yog siv ntev, thiab ua cov ntws uas muaj lub zog (xws li cov dej ntws).

Yog li cas los txiav txim ntawm no: Xaiv PVC resin uas muaj purity siab (tswv yim li suspension resin, uas muaj VCM hauv qab < 1ppm)

② Qhov tsis zoo ntawm kev ua kom sov

PVC yog qhov tseem ceeb rau kev puas tsuaj thaum ua haujlwm, thiab tsis tau HCL gas. Yog tias tsis ntxiv heat stabilizers zoo (tswv yim li lead salt stabilizers lossis calcium-zinc stabilizers), cov khoom puas tsuaj yuav raug rau nrog dej thiab ua rau muaj cov droplets acid.

Yog li cas los txiav txim ntawm no:  Zoo siab dua lub thawj ntxiv heat stabilizer lossis sau cov stabilizer uas muaj peev xwm zoo dua.

· Qhov tseem ceeb ntawm cov khoom siv uas tau ua dua

① Cov khoom siv uas tsis zoo thiab cov khoom siv uas tau ua kom sov

Cov khoom uas tau rov qab mus ua dua muaj cov khoom siv uas tsis zoo (tswv yim li cov plasticizers uas nyuaj lawm), cov khoom siv (calcium carbonate), lossis cov khoom tsis zoo (cov dej muag, cov dej tsis zoo, thiab lwm yam), uas yuav raug rov qab mus ua dua thiab muaj peev xwm tshem tawm.

Yog li cas los txiav txim ntawm no:  Tshem tawm cov khoom uas tau rov qab mus ua dua zoo heev thiab ntxiv cov khoom uas tshem tawm (tswv yim li activated carbon) los tshem tawm cov khoom tsis zoo.

② Qhov tshuaj ntawm cov khoom siv

Kev ua haujlwm ntau yam yog ua rau PVC molecular chains txhais, ua rau muaj ntau dua cov khoom uas muaj molecular weight tsawg thiab ua rau kev tshuav ntawm cov khoom ntau dua.

Yog li cas los txiav txim ntawm no: Tsim lub tshuab ntawm cov khoom uas tau rov qab los siv thiab ntxiv cov khoom uas pab ua kom zoo dua (los ntawm CPE) nyob rau hauv lub sijhawm tom qab.

· Qhov tseem ceeb ntawm cov khoom siv thiab kev ua haujlwm

① Qhov ntau ntawm cov khoom siv thiab qhov tshuaj

Cov phthalate plasticizers (los ntawm DOP) yog qhov tseem ceeb rau kev tshuav, tias nyob rau hauv qhov chaw uas muaj txoj kev ntau thiab ntau dej, uas muaj kev pom zoo li "khoob dej" nyob rau saum pob.

Yog li cas los txiav txim ntawm no:  Rov qab mus siv cov plasticizers uas muaj molecular weight siab lossis cov plasticizers uas muaj polyester.

②Kev tsis sib npaug ntawm lub lubricant

Lub lubricant ntau heev (los ntawm PE wax) yuav tshuav, ua rau muaj cov nplooj tsiaj lossis cov dej droplets.

Yog li cas los txiav txim ntawm no: Txhim kho lub lubrication system (cov xwm txheej ntawm internal thiab external lubrication), los ntawm kev sib npaug oxidized polyethylene wax (OPE wax).

③Thawj yam uas tsis raug ntawm kev txuas tshuab

Thaum cov dej ntawm kev txuas tshuab li cas dua 190℃, PVC yuav plooj ntau dua, thiab cov lus uas plooj yuav cuam tshuam rau hauv qhov chaw thiab nyob rau hauv qhov chaw.

Yog li cas los txiav txim ntawm no:  Tswj cov dej ntawm kev txuas tshuab / kev txuas tshuab (160-180℃), thiab siv cov lus uas plooj rau hauv dej sov (los ntawm NC foaming agents).

·Cov yam tshwj xeeb ntawm lub vaj tsev

①Kev cuam tshuam ntawm cov dej ntawm lub vaj tsev

Cov khoom PVC yuav daws dej rau hauv qhov muaj dej, thiab cov khoom sib xyaw (xyuas li CaCO3) yuav tshuav dej tom qab daws dej.

Yog li cas los txiav txim ntawm no:  Ntxiv cov khoom tshuav dej lossis kho qhov ntsiab.

②Kev cuam tshuam ntawm kev txuas tshuab thiab dej

Thaum cov khoom nyob rau hauv qhov ceev ntau thiab ceev sov (xyuas li qhov kho cov khoom rau hauv qhov sov), qhov dej tshuav rau hauv qhov ntsiab yuav raug ua li qhov "tshuav dej".

Yog li cas los txiav txim ntawm no: Tshem tawm qhov tsis zoo ntawm kev txuas ntaub ntawv los yog siv cov lus qhia tias tsis muaj qhov tshuab hauv kev txuas.

Los ntawm kev saib xyuas PVC resin, cov ntaub ntawv uas tau siv dua, cov lus qhia thiab cov qhov chaw uas muaj kev nyab xeeb, qhov phooj ywg "dripping" ntawm cov khoom PVC yuav tau tshem tawm ntau.