Chiitiko chekudonha kweviscosity panguva yekuchengetedza pendi idambudziko rinowanzoitika, kunyanya mushure mekuchengetedza kwenguva refu, viscosity yepende inoderera zvakanyanya, inokanganisa kushanda kwekuvaka uye kunaka kwechigadzirwa. Kudzikira kweviscosity kunoenderana nezvakawanda zvinhu, senge tembiricha, humidity, solvent volatilization, polymer degradation, nezvimwewo, asi kudyidzana neiyo thickener cellulose ether inonyanya kukosha.
1. Basa rekutanga re cellulose ether
Cellulose ether ndiyo yakajairika thickener inoshandiswa zvakanyanya mumvura-based pendi. Mabasa avo makuru anosanganisira:
Kukora mhedzisiro: Cellulose ether inogona kuumba yakazvimba matatu-dimensional network dhizaini nekutora mvura, nekudaro ichiwedzera viscosity yehurongwa nekuvandudza thixotropy nekuvaka mashandiro epende.
Suspension stabilization effect: Cellulose ether inogona kudzivirira zvinobudirira sedimentation yezvikamu zvakasimba zvakadai se pigment uye fillers mupende uye kuchengetedza kufanana kwepende.
Firimu-yekugadzira pfuma: Cellulose ether inogona zvakare kukanganisa firimu-kugadzira pfuma yependi, ichiita iyo yekupfeka kuve nekumwe kuoma uye kusimba.
Kune marudzi akawanda e-cellulose ethers, kusanganisira methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl methyl cellulose (HPMC), nezvimwewo. Zvinhu izvi zvine solubility yakasiyana, kukwanisa kukora uye kuramba kwekuchengetedza mukuputira.
2. Zvikonzero zvikuru zvekudzikisa viscosity
Panguva yekuchengetera machira, kuderedzwa kweviscosity kunonyanya kukonzerwa nezvikonzero zvinotevera:
(1) Kuderedzwa kwe cellulose ethers
Iko kukora mhedzisiro ye cellulose ethers mumajasi kunoenderana nehukuru hwehuremu hwemamorekuru uye kutendeseka kwemaitiro avo mamorekuru. Panguva yekuchengetedza, zvinhu zvakadai sekushisa, acidity uye alkalinity, uye microorganisms zvinogona kukonzera kuora kwe cellulose ethers. Semuenzaniso, panguva yekuchengetedza kwenguva refu, iyo acidic kana alkaline zvikamu mukuputira zvinogona hydrolyze ma molecular cheni ye cellulose ether, kuderedza uremu hwayo hwemamorekuru, uye nokudaro kushaya simba kwayo kukora, zvichikonzera kuderera kwe viscosity.
(2) Solvent volatilization uye kutama kwehunyoro
Solvent volatilization kana kutama kwemwando mujasi kunogona kukanganisa kunyungudika kwe cellulose ether. Panguva yekuchengetedza, chikamu chemvura chinogona kubuda kana kutamira kune pamusoro pekuputira, zvichiita kuti kugoverwa kwemvura mukuputira kusaenzana, nokudaro kukanganisa dhigirii yekuzvimba ye cellulose ether uye kukonzera kuderera kweviscosity munzvimbo dzemunharaunda.
(3) Microbial attack
Kukura kwehutachiona hunogona kuitika mukuputira kana kusingachengetwe zvisina kunaka kana izvo zvinodzivirira zvikasashanda. Microorganisms inogona kuora cellulose ethers uye mamwe organic thickeners, ichideredza kukora kwadzo uye kuita kuti viscosity yejasi iderere. Mvura-based coatings, kunyanya, inzvimbo yakanaka yekukura kwehutachiona nekuti ine huwandu hwemvura.
(4) Kukura kwekushisa kwepamusoro
Pasi pemamiriro ekuchengetedza tembiricha yepamusoro, chimiro chemuviri kana chemakemikari ye cellulose ether molecular chain inogona kuchinja. Semuyenzaniso, cellulose ethers anowanzoita oxidation kana pyrolysis pane tembiricha yepamusoro, zvichikonzera kupera simba kwekukora. Kupisa kwakanyanya kunomhanyisa kunyungudika kwesolvent uye kubuda kwemvura, zvichiwedzera kukanganisa kugadzikana kwe viscosity.
3. Nzira dzekuvandudza kugadzikana kwekuchengetedza kwekuputira
Kuti uderedze kuderera kwe viscosity panguva yekuchengetedza uye kuwedzera hupenyu hwekuchengetedza hwekuputira, matanho anotevera anogona kutorwa:
(1) Kusarudza yakakodzera cellulose ether
Mhando dzakasiyana dze cellulose ethers dzine maitiro akasiyana maererano nekuchengetedza kugadzikana. Cellulose ethers ine huremu hwemamorekuru hwepamusoro kazhinji dzine mhedzisiro iri nani yekukora, asi kugadzikana kwayo kwekuchengetedza kune kushomeka, nepo cellulose ether ine yakaderera molecular huremu inogona kuve nani kuchengetedza kushanda. Naizvozvo, kana uchigadzira fomula, cellulose ether ine yakanaka kuchengetedza kugadzikana inofanirwa kusarudzwa, kana cellulose ethers inofanirwa kusanganiswa nemamwe makobvu kuti ivandudze kusaga kwavo.
(2) Dzora pH yekuputira
Iyo acidity uye alkalinity yeiyo coating system ine simba rakakosha pakugadzikana kwe cellulose ethers. Mukugadzira dhizaini, iyo pH kukosha kwejasi kunofanirwa kudzorwa kudzivirira yakanyanyisa acidic kana alkaline nharaunda kuderedza kuderedzwa kweselulosi ethers. Panguva imwecheteyo, kuwedzera huwandu hwakakodzera hwepH inogadzirisa kana buffer inogona kubatsira kudzikamisa iyo pH yehurongwa.
(3) Wedzera kushandiswa kwezvinochengetedza
Kuti udzivise kudengenyeka kwehutachiona, huwandu hwakakodzera hwekuchengetedza hunofanira kuwedzerwa pakuputira. Zvichengetedzo zvinogona kutadzisa kukura kwezvipembenene, nokudaro zvichidzivirira organic zvinhu zvakaita se cellulose ether kubva pakuora uye kuchengetedza kugadzikana kwejasi. Kuchengetedza kwakakodzera kunofanira kusarudzwa maererano nekugadzirisa kwekuputira uye nzvimbo yekuchengetedza, uye kushanda kwavo kunofanira kuongororwa nguva dzose.
(4) Dzora nzvimbo yekuchengetedza
Iyo tembiricha yekuchengetera uye humidity yejasi inobata zvakananga pakugadzikana kwe viscosity. Iyo yekuputira inofanirwa kuchengetwa munzvimbo yakaoma uye inotonhorera, kudzivirira kupisa kwakanyanya uye yakakwirira humidity mamiriro ekudzikisa solvent volatilization uye cellulose ether degradation. Mukuwedzera, kurongedza kwakanyatsovharwa kunogona kuderedza kutama uye kubuda kwemvura uye kunonoka kuderera kwe viscosity.
4. Zvimwe zvinhu zvinokanganisa viscosity
Mukuwedzera kune cellulose ethers, zvimwe zvikamu muhurongwa hwekuputira zvinogona kukanganisawo shanduko yeviscosity. Semuenzaniso, rudzi uye kusungirirwa kwemavara, chiyero chekuputika kwezvinonyungudutsa, uye kuwirirana kwezvimwe zvinyoro kana zvinoparadzanisa zvinogona kukanganisa kugadzikana kweviscosity yejasi. Naizvozvo, iyo yakazara dhizaini yekupfekedza fomula uye kudyidzana pakati pezvikamu zvakare mapoinzi akakosha anofanirwa kutariswa.
Kuderera kwe viscosity panguva yekuchengetwa kwejasi kunoenderana zvakanyanya nezvinhu zvakadai sekuderedzwa kwe cellulose ethers, solvent volatilization, uye kufamba kwemvura. Kuti uvandudze kugadzikana kwekuchengetedza kwekuputira, mhando dzakakodzera dze cellulose ether dzinofanirwa kusarudzwa, iyo pH yekupfekedza inofanira kudzorwa, matanho ekurwisa-corrosion anofanirwa kusimbiswa, uye nzvimbo yekuchengetedza inofanira kuvandudzwa. Kuburikidza neyakajeka dhizaini dhizaini uye yakanaka yekuchengetedza manejimendi, dambudziko reviscosity kuderera panguva yekuchengetera coating rinogona kudzikiswa zvinobudirira, uye kuita kwechigadzirwa uye kukwikwidza kwemusika kunogona kuvandudzwa.
Nguva yekutumira: Sep-27-2024