Kufurira kweResin Kugadzikana
PVC resin chinhu chinopisa-sensitive material, uye kune zvakawanda zvakakanganisika mukugadzirwa kwayo kwema molecular, zvakadai sema bond maviri, allyl groups, residual initiator end groups, etc. Zvinoenderana nemagadzirirwo emahara radicals, kukanganisa uku kunoitwa nyore nyore nekupisa uye chiedza kugadzira mahara radicals.Pasi pechiito chemahara radicals, polyvinyl chloride inopinda dehydrochlorination uye kuderedzwa zvinoenderana neketani michina.Iyo inoenderera mberi dehydrochlorination reaction inoburitsa polyene sequence ye conjugated kaviri zvisungo pane huru cheni ye polyvinyl chloride molecule, inova chromogenic chimiro.Chero bedzi iyo nhamba ye conjugated double bonds inosvika 5 ~ 7, polyvinyl chloride inotanga kuDiscoloration, kana yadarika gumi, inoshanduka yero, iyo conjugated sequence inoramba ichireba, uye ruvara rwepolyvinyl chloride inodzika zvishoma nezvishoma, uye pakupedzisira inova brown kana. kunyange dema.Kuchengetedza kugadzikana kwePVC pakupisa tembiricha ndiyo hwaro hwese toning uye chena basa.
Mhedzisiro yekushisa
PVC mapurasitiki profiles akagadzirwa epurasitiki uye akaumbwa patembiricha ye185 ~ 195 ° C, uye nguva yekudziya ikareba semaminitsi akati wandei, izvo zvinoda ma pigment uye zvinopenya zvinoshandiswa kuve nepamusoro kupisa kugadzikana.Kune rutile titanium dioxide, chimiro chayo chekristani chiri cube, maatomu eTi uye maatomu eO akanyatsorongeka, chimiro chekristaro chakanyatsogadzikana, uye chinogona kuchengetedza kugadzikana kwechimiro uye kushanda pasi pekushisa kwekugadzirisa kwePVC profiles;Ultramarine inonzi aluminium silicate.Sulfur-ine makomisheni, kupisa kupisa zvakare kwakanaka kwazvo.Nekudaro, kune fluorescent whitening agents, marudzi akasiyana efluorescent whitening agents anewo mutsauko mukuita kwavo kupisa kupisa.
Acid effect
Iyo PVC yekugadzirisa maitiro inogara ichiperekedzwa nekuparara kwePVC mamorekuru, uye yakawanda yehydrogen chloride inogadzirwa panguva yekuora maitiro.Hydrogen chloride gasi pakupisa kwepamusoro inoparadza zvakanyanya uye ine acid.Pakati pezvinhu zvitatu zviri pamusoro apa, TiO2 ine yakanyanya acid corrosion resistance, inoteverwa nefluorescent whitening agents, uye ultramarine blue ndiyo yakaipisisa (munzvimbo ine acidic, ultramarine blue inoshanduka kubva kublue kuenda kuchena-yekubuda mabhuru makuru).Chikonzero nei ultramarine yebhuruu ichiri kushandiswa mukuumbwa kweprofile pachinzvimbo chephthalocyanine yebhuruu ine nani asidhi inodzivirira imhaka yekuti simba retinting rephthalocyanine bhuruu rakasimba zvakanyanya, iro rinenge 20 ~ 40 nguva yeultramarine yebhuruu.Iko kusanganisa kugona kwemusanganisi, iyo yekuwedzera huwandu hwe ultramarine yebhuruu mureshiyo yega yega i5 ~ 20g chete.Kana ikatsiviwa ne phthalocyanine yebhuruu, huwandu hwekuwedzera hudiki kwazvo, uye chikanganiso chekuyera chakakura kwazvo, izvo zvinozoita kuti mabheti emaprofiles aoneke.Yakakomba chromatic aberration.
The effect of adjuvants
Midziyo yekugadzira uye tekinoroji yePVC epurasitiki profiles munyika yangu inonyanya kutengwa kubva kuEurope nekuUnited States.Pachine mwero wakati wemutobvu mairi.Iyo sarufa iri muultramarine yebhuruu inogona kudyidzana nemutobvu mune inodzikamisa, zvichikonzera dema lead sulfide yakasvibiswa profiles.
Mhedzisiro yeinopenya dosage
Titanium dioxide ndiyo hwaro hwe toning uyewhiteningyewhite PVC profiles.Sezvo huwandu hwetitanium dioxide huchiwedzera, kuchena kwechigadzirwa kunowedzera.
Uye zvakare, seyakanyanya UV inodzivirira mumiriri mukugadzirwa kwezvinhu zvakadhindwa, iyo dosage yetitanium dioxide inewo zvimwe zvinodiwa.Kazhinji kutaura, kuyerwa kwetitanium dioxide kunofanirwa kusvika 4 ~ 8phr.
Ultramarine bhuruu inoshandiswa "kuvhara yero" kuzadzisa chinangwa chekuchena.Kana iyo dosi iri diki zvakanyanya, iyo yekuchena mhedzisiro haina kunaka.Kana iyo dosi yakakurisa, zviri nyore kuita kuti iyo yakadhindwa iite sebhuruu uye kuburitsa yakawanda lead sulfide, iyo inokanganisa kupenya kwepamusoro kweiyo profiled zvinhu.Nokudaro, chiyero chayo chinowanzodzorwa kuti ive inenge 0.5% yepimo yetitanium dioxide.
Fluorescent whitening agentsinogona kunyatsotora ultraviolet mwaranzi yeimwe wavelength uye kuiburitsa muchimiro chechiedza chinooneka.Nekuwedzera kwehuwandu hwe fluorescent whitening agent, kuchena kwechigadzirwa kunowedzera;asi kana iyo fluorescent whitening agent inosvika pane imwe fungidziro, kuramba uchiwedzera huwandu hakuna chinhu chakakosha pakuchena kwePVC profiles, uye dzimwe nguva inodzikira, uye huwandu hwacho hwakakura.Iko pesvedzero pakuita kwekugadzirisa uye zvemuviri uye zvemichina zvimiro zveiyo profiled zvinhu zvinofanirwa kutariswa.
Nguva yekutumira: Mar-26-2022