1. Tsanangudzo uye basa remuchina wekukora
Zvinowedzerwa zvinogona kuwedzera zvakanyanya kunaka kwependi dzinobva mumvura zvinonzi zvinogocha.
Zvinokora zvine basa rakakosha mukugadzirwa, kuchengetwa uye kugadzirwa kwezvipfeko.
Basa guru remuchina wekukora nderekuwedzera kusimba kwejira rekuputira kuti rienderane nezvinodiwa pamatanho akasiyana ekushandiswa. Zvisinei, kusimba kunodiwa nejira rekuputira pamatanho akasiyana kwakasiyana. Semuenzaniso:
Munguva yekuchengetera, zvinodikanwa kuti pave nekupenya kwakanyanya kudzivirira kuti pigment isagadzikane;
Munguva yekuvaka, zvinokurudzirwa kuti pendi ive ne viscosity iri pakati nepakati kuitira kuti ikwanise kukwesha zvakanaka pasina kushatisa pendi zvakanyanya;
Mushure mekuvakwa, zvinotarisirwa kuti viscosity inogona kudzokera nekukurumidza kuviscosity yakakura mushure menguva pfupi yekunonoka (maitiro ekuenzana) kudzivirira kudzika.
Kuyerera kwezvipfeko zvinobuda mumvura hakusi kweNewtonian.
Kana viscosity yependi ikadzikira nekuwedzera kwesimba rekuchekerera, inonzi pseudoplastic fluid, uye pendi yakawanda inenge iri pseudoplastic fluid.
Kana maitiro ekuyerera kwemvura yepseudoplastic akabatana nenhoroondo yayo, kureva kuti, inoenderana nenguva, inonzi mvura yethixotropic.
Pakugadzira machira ekudzivirira, tinowanzoedza nemaune kugadzira machira e-thixotropic, akadai sekuwedzera zvimwe zvinhu.
Kana thixotropy yependi yakakodzera, inogona kugadzirisa kusawirirana kwezvikamu zvakasiyana-siyana zvependi, uye kusangana nezvinodiwa zvehunyanzvi zvekusimba kwakasiyana kwependi muzvikamu zvekuchengetera, kuenzana kwekuvaka, uye kuomesa.
Zvimwe zvinogodza zvinogona kupa pendi thixotropy yakawanda, zvekuti ine viscosity yakakwira kana yakamira kana kuti ine shear rate yakaderera (sekuchengetera kana kutakurwa), kuitira kudzivirira pigment iri mupendi kuti isagadzikane. Uye kana shear rate yakanyanya (sekupfekedza), ine viscosity yakaderera, zvekuti coating yacho ine flow yakakwana uye leveling.
Thixotropy inomiririrwa ne thixotropic index TI uye inoyerwa neBrookfield viscometer.
TI=kusviba (yakayerwa pa 6r/min)/kusviba (yakayerwa pa 60r/min)
2. Mhando dzezvikukutu uye mhedzisiro yazvo pahunhu hwekuputira
(1) Mhando Panyaya yemakemikari, zvinogocha zvakakamurwa kuita mapoka maviri: zvechisikigo uye zvechisikigo.
Mhando dzezvinhu zvisina kugadzirwa dzinosanganisira bentonite, attapulgite, aluminium magnesium silicate, lithium magnesium silicate, nezvimwewo, mhando dzezvinhu zvisina kugadzirwa dzakadai semethyl cellulose, hydroxyethyl cellulose, polyacrylate, polymethacrylate, acrylic acid kana methyl Acrylic homopolymer kana copolymer uye polyurethane nezvimwewo.
Kubva pamaonero ekuti zvinokanganisa sei maitiro e rheological e coatings, thickeners dzakakamurwa kuita thixotropic thickeners uye associative thickeners. Panyaya yezvinodiwa pakushanda, huwandu hwe thickener hunofanira kunge hushoma uye mhedzisiro yekukora yakanaka; hazvisi nyore kupwanywa nema enzymes; kana tembiricha kana pH yesystem ikachinja, viscosity ye coatings haizodzikiswe zvakanyanya, uye pigment ne filler hazvizotsvedzere. ; Kugadzikana kwakanaka kwekuchengetedza; kuchengetedza mvura zvakanaka, hapana chiitiko chiri pachena chekuburitsa furo uye hapana mhedzisiro yakaipa pakushanda kwe coatings film.
①Chinokora sero
Zvinonyanya kushandiswa mukugadzira machira e cellulose zvinosanganisira methylcellulose, hydroxyethylcellulose uye hydroxypropylmethylcellulose, uye zviviri zvekupedzisira ndizvo zvinonyanya kushandiswa.
Hydroxyethyl cellulose chigadzirwa chinowanikwa nekutsiva mapoka ehydroxyl pamayuniti eglucose e natural cellulose nemapoka ehydroxyethyl. Magadzirirwo uye mamodheru ezvigadzirwa zvinonyanya kusiyaniswa zvichienderana nehuwandu hwekutsiva uye viscosity.
Mhando dzehydroxyethyl cellulose dzakakamurwawo kuva mhando yekunyungudika kwakajairika, mhando yekupararira nekukurumidza uye mhando yekugadzikana kwehupenyu. Kana tichitarisa nzira yekushandisa, hydroxyethyl cellulose inogona kuwedzerwa pamatanho akasiyana mukugadzirwa kwekuputira. Mhando yekupararira nekukurumidza inogona kuwedzerwa zvakananga muchimiro cheupfu hwakaoma. Zvisinei, pH kukosha kwesystem isati yawedzerwa inofanira kunge iri pasi pe7, kunyanya nekuti hydroxyethyl cellulose inonyungudika zvishoma nezvishoma pa pH yakaderera, uye pane nguva yakakwana yekuti mvura ipinde mukati mezvikamu, uye ipapo pH kukosha inowedzerwa kuti inyungudike nekukurumidza. Matanho anoenderana anogonawo kushandiswa kugadzirira huwandu hwakati hweglue solution uye kuiisa mu coating system.
Hydroxypropyl methylcellulosechigadzirwa chinowanikwa nekutsiva boka rehydroxyl pachikamu cheglucose che cellulose yechisikigo neboka re methoxy, nepo chimwe chikamu chichitsiviwa neboka rehydroxypropyl. Kusimba kwayo kwakafanana nekwe hydroxyethyl cellulose. Uye inodzivirira kukuvadzwa kwe enzyme, asi kunyungudika kwayo kwemvura hakuna kunaka sekwe hydroxyethyl cellulose, uye ine dambudziko re gelling kana yapiswa. Kune hydroxypropyl methylcellulose yakagadziriswa pamusoro, inogona kuwedzerwa zvakananga mumvura kana yashandiswa. Mushure mekukurunga nekupararira, wedzera zvinhu zve alkaline zvakaita semvura yeammonia kuti ugadzirise pH kusvika 8-9, uye kurunga kusvika yanyungudika zvizere. Kune hydroxypropyl methylcellulose isina kurapwa pamusoro, inogona kunyikwa uye kuzvimba nemvura inopisa pamusoro pe 85°C isati yashandiswa, uye yozotonhodzwa kusvika patembiricha yemukamuri, yozokurunga nemvura inotonhora kana mvura yechando kuti inyungudike zvizere.
②Chinokora zvinhu zvisina organic
Rudzi urwu rwechinogodza runonyanya kushandiswa mukugadzira zvinhu zvevhu, zvakaita se bentonite, magnesium aluminium silicate clay, nezvimwewo. Runoonekwa nekuti pamusoro pekukora kwaro, rinewo simba rakanaka rekumisa, rinogona kudzivirira kunyura, uye harizokanganisi kuramba mvura kwejira. Mushure mekunge jira racho raoma uye raumbwa kuita firimu, rinoshanda sechinozadza mujira racho, nezvimwewo. Chinhu chisina kunaka ndechekuti richakanganisa zvakanyanya kuenzana kwejira racho.
③ Chinhu chinosimbisa polymer chakagadzirwa nepurasitiki
Zvishandiso zvepolymer zvakagadzirwa ne synthetic zvinonyanya kushandiswa mu acrylic ne polyurethane (zvishandiso zve associated thickeners). Zvishandiso zve acrylic zvinonyanya kushandiswa mu acrylic polymers dzine mapoka e carboxyl. Mumvura ine pH ye8-10, boka re carboxyl rinopatsanuka uye rinozvimba; kana pH yadarika 10, inonyungudika mumvura uye inorasikirwa ne thickening effect, saka thickening effect inonyanya kukanganiswa ne pH value.
Maitiro ekukora kweacrylate thickener ndeekuti zvidimbu zvayo zvinogona kunamirwa pamusoro pezvidimbu zvelatex mupendi, uye kugadzira layer yekufukidza mushure mekuputika kwealkali, izvo zvinowedzera huwandu hwezvidimbu zvelatex, zvinotadzisa kufamba kweBrownian kwezvidimbu, uye zvinowedzera viscosity yesystem yependi. ; Chechipiri, kuzvimba kwethickener kunowedzera viscosity yechikamu chemvura.
(2) Simba remuchina wekukora pahunhu hwekuputira
Mhedzisiro yerudzi rwechinotinha pahunhu hwerheological hwekuputira ndeiyi inotevera:
Kana huwandu hwechinhu chinogokora hukawedzera, kusimba kwepende kunowedzera zvakanyanya, uye kuchinja kwehusimba hwepende kunoenderana kana ichishandiswa nesimba rekunze rekuchekerera.
Nekusimba kwechinhu chinogokora, viscosity yependi inodonha nekukurumidza kana yaiswa simba rekuchekwa, zvichiratidza kusanyatsogadzirwa.
Uchishandisa chinhu chinonyungudutsa cellulose chinonyungudutswa mumvura (senge EBS451FQ), kana chakanyanya kuchekwa, viscosity ichiri yakakwira kana huwandu hwacho hwakawanda.
Uchishandisa associative polyurethane thickeners (yakadai seWT105A), kana yave yakanyanya kuchekwa, viscosity ichiri yakakwira kana huwandu hwacho hwakawanda.
Uchishandisa ma acrylic thickeners (akadai seASE60), kunyangwe static viscosity ichikwira nekukurumidza kana huwandu hwacho hwakawanda, viscosity inoderera nekukurumidza padanho repamusoro rekuchekwa.
3. Chinosanganisa kukora
(1) nzira yekukora
Cellulose ether uye acrylic thickeners dzinokwanisa kukora mvura chete, asi hadzina simba rekukora pane zvimwe zvikamu zviri mupendi inobva mumvura, uye hadzigone kukonzera kudyidzana kwakakosha pakati pemavara ari mupendi nezvidimbu zve emulsion, saka rheology yependi haigone kugadziriswa.
Zvishandiso zvinosanganisa simbi zvinoonekwa nekuti pamusoro pekukora kuburikidza nekunyorova, zvinokorawo kuburikidza nekubatana pakati pazvo, nezvimedu zvakapararira, uye nezvimwe zvinhu zviri musystem. Kubatana uku kunosiyana pahuwandu hwekucheka kwakakwira uye kunobatanazve pahuwandu hwekucheka kwakaderera, zvichiita kuti rheology yependi igadziriswe.
Maitiro ekukora kwe associative thickener ndeekuti molecule yayo iketani ine hydrophilic linear, polymer compound ine mapoka e lipophilic kumativi ese, kureva kuti, ine mapoka e hydrophilic uye hydrophobic muchimiro, saka ine hunhu hwemamorekuru e surfactant. Mamorekuru akadaro e thickener haangogone kunyorova nekuzvimba chete kuti aite torso yemvura, asiwo kugadzira micelles kana huwandu hwemvura yayo inodarika kukosha kwakati. Micelles inogona kubatana ne polymer particles ye emulsion uye pigment particles dzakabata dispersant kuti dzigadzire network structure ine mativi matatu, uye dzakabatana uye dzakabatwa kuti dziwedzere viscosity yesystem.
Chinonyanya kukosha ndechekuti hukama uhwu huri mumamiriro ekuenzana kwesimba, uye ma micelles aya akabatana anogona kugadzirisa nzvimbo dzawo kana achinge aiswa pasi pesimba rekunze, kuitira kuti coating ive nehunhu hwekuenzana. Pamusoro pezvo, sezvo molekyuru ine ma micelles akawanda, chimiro ichi chinoderedza katsika kemamorekuru emvura kuti afambe uye nokudaro anowedzera viscosity yechikamu chemvura.
(2) Basa riri muzvipfeko
Zvizhinji zvezvinobatanidza zvinosanganisa ipolyurethanes, uye huremu hwazvo hwemamorekuru huri pakati pe103-104 orders dzehukuru, orders mbiri dzehukuru dzakaderera pane polyacrylic acid yakajairika uye cellulose thickeners dzine huremu hwemamorekuru huri pakati pe105-106. Nekuda kwehuremu hushoma hwemamorekuru, kuwedzera kwehuwandu hunoshanda mushure mekunyorova kushoma, saka viscosity curve yayo yakatsetseka kupfuura ye non-associated thickeners.
Nekuda kwehuremu hushoma hwe associative thickener, kupindirana kwayo pakati pemamorekuru muchikamu chemvura kwakaganhurirwa, saka mhedzisiro yayo yekukora pachikamu chemvura haina kukosha. Muchikamu chidiki che shear rate, kushandurwa kwehukama pakati pemamorekuru kunopfuura kuparadzwa kwehukama pakati pemamorekuru, sisitimu yese inochengetedza mamiriro ekumisikidzwa uye ekupararira, uye viscosity iri pedyo ne viscosity ye dispersion medium (mvura). Nokudaro, associative thickener inoita kuti sisitimu yependi yakagadzirwa nemvura iratidze viscosity yakaderera kana iri munzvimbo yakaderera ye shear rate.
Zvishandiso zvinosanganisa zvinowedzera simba pakati pemamorekuru nekuda kwekubatana pakati pezvikamu zviri muchikamu chakapararira. Nenzira iyi, simba rakawanda rinodiwa kuti pave nekubatana pakati pemamorekuru padanho repamusoro rekuchekwa, uye simba rekuchekwa rinodiwa kuti pave nekuchekwa kwakafanana rakakurawo, zvekuti sisitimu inoratidza mwero wepamusoro wekuchekwa padanho repamusoro rekuchekwa. Kuoneka kwekunaka. Kunaka kwakanyanya kwekuchekwa kwepamusoro uye kuderera kwekuchekwa kwakaderera kunogona kungotsiva kushomeka kwezvishandiso zvinobatanidza muhunhu hwerheological hwependi, kureva kuti, zvishandiso zviviri zvinogona kushandiswa pamwe chete kugadzirisa kuyerera kwependi yelatex. Kushanda kwakasiyana-siyana, kusangana nezvinodiwa zvakakwana zvekupekwa mufirimu gobvu uye kuyerera kwefirimu rekupekwa.
Nguva yekutumira: Kubvumbi-28-2024