ntchito

TheChithunzi cha PVCMapangidwe ali ndi: PVC utomoni, zosintha mphamvu, stabilizer, processing modifier, filler, pigment ndi lubricant kunja.

1. PVC utomoni

Kuti mupeze pulasitiki yofulumira komanso yofananira, njira yoyimitsira iyenera kugwiritsidwa ntchito kumasula utomoni.

——Utomoni womwe umagwiritsidwa ntchito pamapaipi amalata okhala ndi mipanda iwiri uyenera kukhala ndi kulemera kwa mamolekyu abwino ndi zonyansa, kuti achepetse “diso la nsomba” mu chitoliro ndi kupewa kugwa kwa zitoliro ndi kung’ambika kwa khoma la chitoliro.

——Utomoni womwe umagwiritsidwa ntchito popanga mapaipi operekera madzi uyenera kukhala “waukhondo”, ndipo vinyl chloride yotsalira mu utomoni uyenera kukhala mkati mwa 1 mg/kg.Pofuna kuonetsetsa kuti chitoliro chikuyenda bwino komanso kuchepetsa kuchuluka kwa zolakwika, gwero la utomoni liyenera kukhala lokhazikika.

2. Stabilizer

Pakadali pano, zoziziritsa kutentha zomwe zimagwiritsidwa ntchito ku China ndi: sopo zachitsulo, zowongolera zamchere zophatikizika, zokhazikika zapadziko lapansi, ndi zokhazikika za malata.

Ma stabilizer okhala ndi zitsulo zolemera (monga Pb, Ba, Cd) amawononga thanzi la munthu, ndipo mlingo wa stabilizers pakupanga mapaipi operekera madzi ndi ochepa.Mu ndondomeko ya extrusion ya single-screw, mbiri ya kutentha kwa zinthuzo ndi yaitali kuposa momwe amapangira mapasa, ndipo kuchuluka kwa stabilizer m'mbuyomu kumawonjezeka ndi oposa 25%.Kutentha kwa mutu wa chitoliro cha corrugated chapawiri-khoma ndikokwera kwambiri, zinthuzo zimakhala pamutu kwa nthawi yayitali, ndipo kuchuluka kwa stabilizer mu chilinganizo ndi choposa cha chitoliro wamba.

3. Wodzaza

Ntchito ya fillers ndi kuchepetsa ndalama.Yesani kugwiritsa ntchito zojambulira zabwino kwambiri (zamtengo wapamwamba).Kuchuluka kwa zinthu zapaipi ndizokulirapo kuposa mbiri.Kuchuluka kwa zodzaza kumapangitsa kukana kwamphamvu kutsika komanso kukana kwa chitoliro kutsika.Choncho, mu mipope mankhwala ndi madzi mipope, kuchuluka kwa filler mu makope zosakwana 10.Kuchuluka kwa filler mu chitoliro chokhetsa ndi manja ozizira opangidwa ndi ulusi amatha kukhala ochulukirapo, ndipo kuchuluka kwa CPE kumatha kuonjezedwa kuti kusinthe kutsika kwa magwiridwe antchito.

Kwa mapaipi omwe ali ndi zofunikira zochepa pakugwira ntchito kwa chitoliro, ndi mapaipi amvula, kuchuluka kwa zodzaza kumatha kukhala kwakukulu, koma kuvala kwa mapaipi-screw extruder ndikovuta.

4. Wosintha

(1) Kusintha kosintha: mapaipi wamba angagwiritsidwe ntchito mochepera kapena ayi;mapaipi a malata ndi mapaipi amipanda yopyapyala amagwiritsidwa ntchito kwambiri.

(2) Impact modifier: mlingo wocheperako kuposa mbiri, pazifukwa ziwiri: 1. Magwiridwe, kukana kutentha kwapansi, mphamvu zamanjenje 2. Mtengo

(3) Zina zowonjezera, mitundu, ndi zina: Pamene mbiriyo imagwiritsidwa ntchito ngati anti-aging agent, titaniyamu dioxide iyenera kuwonjezeredwa.The chilinganizo cha okhwima PVC chitoliro makamaka pigment, makamaka titaniyamu woipa kapena mpweya wakuda, amene akhoza kusankhidwa malinga ndi maonekedwe amafuna chitoliro.

5. Kufananiza kwa lubricant kunja ndi stabilizer

(1) Sankhani mafuta ofananira akunja malinga ndi stabilizer

a.Organotin stabilizer.The organic malata stabilizer ali bwino ngakhale ndi PVC utomoni, ndipo ali ndi chizolowezi kwambiri kumamatira khoma zitsulo.Mafuta otsika mtengo kwambiri akunja omwe amafanana nawo ndi paraffin-based paraffin-calcium stearate system.

b.Kutsogolera mchere stabilizer.Mchere wokhazikika wa mchere umakhala wosagwirizana bwino ndi utomoni wa PVC, ndipo umangomangiriza pamwamba pa tinthu tating'ono ta PVC, zomwe zimalepheretsa kuphatikizika pakati pa PVC particles.Nthawi zambiri, mafuta akunja a lead stearate-calcium stearate amagwiritsidwa ntchito kuti agwirizane nawo.

(2) Kuchuluka kwa mafuta akunja.Ngati kusintha kuchuluka kwa mafuta akunja sikungakwaniritse zofunikira pakukonza zinthu, mutha kulingalira kuwonjezera mafuta pang'ono amkati.Pamene mphamvu toughening modifier ntchito, chifukwa mkulu kusungunuka mamasukidwe akayendedwe kukhuthala, kuthekera kumamatira pamwamba zitsulo ndi mkulu, ndipo kuchuluka kwa lubricant kunja nthawi zambiri ayenera kuwonjezedwa;Chitoliro chokhala ndi mipanda yokhuthala chimafuna mafuta ambiri akunja.Pamene kutentha kwa processing kuli kwakukulu, chizoloŵezi cha kusungunula kumamatira pamwamba pazitsulo ndipamwamba, ndipo mafuta owonjezera akunja amawonjezeredwa.

Kodi mapaipi a PVC amapangidwa bwanji?

Mapaipi a PVC amapangidwa ndi extrusion ya PVC yopangira, ndipo nthawi zambiri amatsata njira zomwezo zomwe zimagwira chitoliro cha extrusion:

• Kudyetsa zopangira ma pellets / ufa mu PVC twin screw extruder
• Kusungunuka ndi kutentha m'magawo angapo a extruder
• Kutuluka kudzera mu ufa kuti apange chitoliro
• Kuzizira kwa chitoliro chopangidwa
• Kudula mapaipi a PVC mpaka kutalika komwe mukufuna