Iplastiki yePVC yenziwe ngerhasi yeacetylene kunye nehydrogen chloride, emva koko yenziwe ipolymerized.Ekuqaleni kwe-1950, yaveliswa yindlela ye-acetylene carbide, kwaye ekupheleni kweminyaka yee-1950, yajika kwindlela ye-ethylene oxidation enezixhobo ezaneleyo kunye neendleko eziphantsi;Okwangoku, ngaphezu kwe-80% yee-resin ze-PVC emhlabeni ziveliswa ngale ndlela.Nangona kunjalo, emva kwe-2003, ngenxa yokunyuka kwexabiso leoli, ixabiso le-acetylene carbide indlela yayimalunga ne-10% ephantsi kunendlela ye-ethylene oxidation, ngoko ke inkqubo ye-PVC yajika kwindlela ye-acetylene carbide.
Iplastiki yePVC ipholymerized ngulwelo vinyl chloride monoma (VCM) ngokunqunyanyiswa, lotion, isambuku okanye inkqubo isisombululo.Inkqubo yokunqunyanyiswa kwepolymerization ibe yeyona ndlela iphambili yokuvelisa i-PVC resin kunye nenkqubo yokuvelisa evuthiweyo, ukusebenza okulula, ixabiso eliphantsi lemveliso, iintlobo ezininzi zeemveliso kunye noluhlu olubanzi lwesicelo.Ibalelwa malunga ne-90% yezityalo zePVC zehlabathi (ihomopolymer ikwabalelwa malunga ne-90% yemveliso yePVC yehlabathi).Eyesibini yindlela yokuthambisa, esetyenziselwa ukuvelisa intlama yePVC.I-polymerization reaction iqalwa ngama-radicals asimahla, kwaye iqondo lobushushu lokusabela lidla ngokuba yi-40~70oc.Ubushushu bokusabela kunye nokuxinana komqalisi kunempembelelo enkulu kwireyithi yepolymerization kunye nokuhanjiswa kobunzima bemolekyuli yePVC resin.
Songa ukhetho lweresiphi
Ifomula yeprofayile yeplastiki yePVC ikakhulu yenziwe ngentlaka yePVC kunye nezongezelelo, ezahlulahlulwe zibe: ukuzinzisa ubushushu, isithambisi, isilungisi sokulungisa, isilungisi sempembelelo, isihluzi, iarhente yokulwa nokuguga, umbala, njl. ukuqonda ukusebenza kwePVC resin kunye nezongezo ezahlukeneyo.
1. I-resin iya kuba yi-pvc-sc5 resin okanye i-pvc-sg4 resin, oko kukuthi, i-PVC resin ene-polymerization degree ye-1200-1000.
2. Inkqubo yokuzinza kwe-thermal kufuneka yongezwe.Khetha ngokweemfuno zangempela zemveliso, kwaye ubeke ingqalelo kwisiphumo se-synergistic kunye nesiphumo esichasayo phakathi kwezinzisi zobushushu.
3. Isilungisi sempembelelo kufuneka songezwe.I-CPE kunye ne-ACR izilungisi zempembelelo zinokukhethwa.Ngokwamanye amacandelo kwifomula kunye namandla eplastiki ye-extruder, inani elongezelelweyo liyi-8-12.I-CPE inexabiso eliphantsi kunye noluhlu olubanzi lwemithombo;I-ACR inokumelana nokuguga okuphezulu kunye namandla eefayili.
4. Yongeza inani elifanelekileyo kwisistim yokuthambisa.Inkqubo yokuthambisa inokunciphisa umthwalo womatshini wokulungisa kwaye wenze imveliso igudiswe, kodwa ukugqithisa kuya kubangela ukuba amandla e-weld fillet ehle.
5. Ukongeza i-process modifier inokuphucula umgangatho weplastiki kunye nokuphucula ukubonakala kweemveliso.Ngokubanzi, i-ACR processing modifier yongezwa kwisixa se-1-2 yamacandelo.
6. Ukongeza i-filler kunokunciphisa iindleko kunye nokwandisa ukuqina kweprofayili, kodwa kunempembelelo enkulu kumandla obushushu obuphantsi.Ukukhanya okusebenzayo kwe-calcium carbonate ene-fineness ephezulu kufuneka yongezwe, kunye nenani elongezelelweyo le-5-15.
7. Umlinganiselo othile we-titanium dioxide kufuneka wongezwe kwi-shield ultraviolet imitha.I-Titanium dioxide kufuneka ibe luhlobo lwe-rutile, kunye nenani elongezelelweyo le-4-6.Ukuba kuyimfuneko, i-ultraviolet absorbers UV-531, uv327, njl.
8. Ukongeza i-blue and fluorescent brightener kwisixa esifanelekileyo kunokuphucula kakhulu umbala weprofayili.
9. Ifomyula kufuneka yenziwe ibe lula kangangoko, kwaye izongezo zolwelo mazingadityaniswa kangangoko kunokwenzeka.Ngokweemfuno zenkqubo yokuxuba (jonga ingxaki yokuxuba), ifomyula kufuneka ihlulwe kwizinto eziphathekayo I, izinto ze-II kunye nezinto ze-III kwiibhetshi ngokulandelelana kokutya, kwaye zipakishwe ngokulandelanayo.
Ipolymerization yokumiswa egotyiweyo
Ukumiswa kwepolymerization kugcina amathontsi olwelo lomzimba omnye enqunyanyisiwe emanzini ngokuqhubeka nokushukuma, kwaye ukusabela kwepolymerization kuqhutywa kumathontsi amancinci e-monomer.Ngokwesiqhelo, ukunqunyanyiswa kwepolymerization yipolymerization ephakathi.
Kwiminyaka yakutshanje, iinkampani ziye zaqhubeka nokufunda kwaye ziphucula ifomula, i-polymerizer, iindidi zemveliso kunye nomgangatho wenkqubo yokunqunyanyiswa kwepolymerization ye-PVC resin, kwaye yaphuhlisa itekhnoloji yenkqubo eneempawu zabo.Okwangoku, inkampani ye-Geon (inkampani yangaphambili ye-BF Goodrich) iteknoloji, iteknoloji yenkampani ye-shinyue eJapan kunye ne-EVC inkampani ye-teknoloji yaseYurophu isetyenziswa ngokubanzi.Ubuchwephesha bezi nkampani zintathu bubalelwa malunga ne-21% yomthamo omtsha wePVC wehlabathi wokuvelisa intlaka ukusukela ngo-1990.
Ixesha lokuposa: Jul-15-2022