Cov tshuaj nplaum uas ua los ntawm dej tsis yaj hauv dej, tab sis muaj qee yam khoom ua kom tawv (tsis muaj cov ionic lossis molecular saw ntev txog li 2 ~ 3 theem, thaj chaw loj) ntawm cov organic additives. Nws yog ib chav kawm ntawm cov tshuaj nplaum uas ua los ntawm dej , feem ntau siv rau hauv cov txheej txheej, yas, roj hmab, xim thiab lwm yam txheej txheej organic, cov nplaum thiab lwm yam lag luam. Cov tshuaj nplaum yog ib chav kawm ntawm cov organic compounds hydrogenated los ua ib qho emulsion ntawm ester pawg (saib Appendix A), cov tshuaj nplaum feem ntau yog tsim los ntawm stearic acid (ester), hydroxyl (tshwj xeeb tshaj yog ester pawg), hydrogen bonding, hydroxyl, carboxyl, thiab amide pawg. Hydrogen bonding ntawm cov pawg ester muab cov tshuaj nplaum rau cov dej-nqus lossis o. Yog li ntawd, cov tshuaj nplaum tuaj yeem kov yeej cov xim, cov nplaum vim qhov kub siab nthuav dav ntawm cov txheej nplaum wrinkled, tawg lossis tev tawm thiab lwm yam tsis zoo. Nws muaj kev tiv thaiv kev laus zoo heev, tiv thaiv acid thiab alkali, thiab cov khoom siv kho tshuab zoo, tiv taus huab cua, tiv taus kub thiab tiv taus txias.
- Txheej txheem cej luam
Raws li nws cov qauv, stiffener tuaj yeem muab faib ua ob pawg: roj-soluble thiab dej-soluble. Roj-soluble stiffener feem ntau yog siv rau hauv txheej, yas thiab roj hmab thiab lwm yam organic coatings los tiv thaiv cov khoom los ntawm blistering, rupture, tev thiab lwm yam tsis xws luag vim kub expansion. Dej-soluble stiffener muaj cov nyhuv softening ntawm cov roj thiab dej tov, uas yuav tsis ua rau cov xim tawg, tab sis cov xim sib tov tsis tuaj yeem ua rau tag nrho los yog ua rau nws turbid thiab lwm yam tsis xws luag. Vim lub hardening nyhuv tsis tsim los ntawm cov khoom (xws li acrylic acid hom los yog sulfonate ester hom) los yog tsis tsim by-products, yog li txhim kho cov dispersibility ntawm hardener thiab ua rau kom lub hardening muaj peev xwm ho txhim kho nws tshav kub tsis kam, weathering, txias tsis kam thiab tsis kub kev kawm. Nyob rau tib lub sijhawm tuaj yeem txo cov kuab tshuaj hauv cov txheej txheem thiab txuas ntxiv cov dej-raws li stiffener nyob rau hauv cov txheej txheem ziab lub sij hawm yuav tsum tau txo cov nqi tsim khoom.
- II. Cov qauv tshuaj lom neeg yooj yim
Stiffeners feem ntau yog tsim los ntawm acetate esters, fatty acid esters, hydroxy acid esters lossis alkyl lipids. Feem ntau ntawm cov stiffener muaj cov dej nqus dej, yog li cov kuab tshuaj organic tuaj yeem cuam tshuam zoo rau hauv emulsion thiab txo cov viscosity ntawm stiffener system, nws kuj tuaj yeem siv los ua stabilizer lossis emulsifier. Stiffener kuj muaj cov khoom tshwj xeeb ntawm hom, xws li: hnyav-raws li stiffener siv hauv plastics, roj hmab, coatings, adhesives thiab lwm yam lag luam. Solvent-based stiffeners yog siv nyob rau hauv cov xim thiab coatings nrog zoo stiffening nyhuv. Cov kua dej yog siv hauv kev lag luam khoom noj kom muaj kev ua tau zoo. Insoluble hauv dej, soluble hauv cov kuab tshuaj organic xws li acrylates, tuaj yeem ua ke nrog feem ntau cov kuab tshuaj organic. Nws tuaj yeem tsim hydrogen bonding nrog acid thiab alkali, muaj zog chelating zog rau anhydride thiab lwm yam ionic zog, thiab tuaj yeem ua polymerized nrog ntau hom polymers. Nws muaj cov huab cua tsis zoo, siab tawv thiab corrosion kuj.
III. Kev siv cov stiffener
Mixing: stiffener nyob rau hauv qhov sib tov yuav tshwm sim ntau aggregation, nyob rau hauv lub mixing thiab stirring txheej txheem los tsim cov phenomenon ntawm npuas, thiab ntau dhau lawm. Nws yuav ua rau tsim cov emulsion zaj duab xis rau saum npoo ntawm cov xim thiab ua rau cov nyhuv stiffening tsis zoo thiab lwm yam teeb meem. Yog li ntawd, kev saib xyuas yuav tsum tau them rau qhov ntau npaum ntawm hardener, tus nqi yuav tsum tsim nyog, thiab cov sib tov yuav tsum tsis txhob tuab heev, thiaj li tsis mus disperse unevenly ua rau blistering, cuam tshuam rau kev siv ntawm cov nyhuv.
Low-speed mixing: low-speed mixing equipment yog siv los hydrate lub stiffener thiab tsim cov dej sib tov sib xws. Cov txheej txheem muaj cov nram qab no: ua ntej ntxiv ib tug tsawg concentration ntawm stearic acid (ester), hydroxyl, hydrogen bonding thiab hydroxyl, thiab ces tov nrog stearic acid los yog ester pawg los tsim ib tug stiffener; los yog ob qho tib si nrog cov stiffener sib tov tom qab ntxiv cov dej kom raug kom nws denatured los ntawm cua sov.
Hom tshuaj yaj: hom tshuaj stiffener no yog raws li carboxyl (lossis hydroxyl) ua ib chav kawm ntawm cov organic compounds lossis polymers, yaj hauv dej thiab tsim cov qauv copolymer (feem ntau yog ester-based). Los yog nws cov polymerization kom tau txais cov saw hlau molecular ntev dua, thaj chaw loj dua, viscosity siab dua thiab muaj cov khoom zoo dispersion thiab qee qib ntawm adhesion hauv cov dej txheej system (feem ntau nyob ntawm qhov ntau ntawm cov resin system hauv stiffener) ntawm cov polymer rau cov qauv crosslinked ntawm cov khoom. Stiffener yog cov kua emulsion, uas yog absorbed ntawm chav tsev kub thiab undergoes ib tug series ntawm cov tshuaj tiv thaiv los tsim ib tug network qauv. Stiffeners feem ntau muaj me me ntawm cov ntsev, carboxylic acids (piv txwv li, hydroxylamine, phosphate esters, lossis disodium sulfonate), lossis me me ntawm cov hlau ions ua additives. Nws daim ntawv thov ntau yam yog dav heev, suav nrog cov dej-raws li coatings , yas zaj duab xis, adhesives thiab polymers uas muaj stiffener kuj tseem siv tau ua cov khoom siv rau coatings lossis yas khoom.
- Dej-raws li los yog roj-raws li: muaj feem xyuam rau txhua hom txheej txheej, feem ntau cov khoom nruab nrab;
- uas tsis yog dej soluble: tuaj yeem yaj hauv dej thiab maj mam dispersed hauv emulsion uniformly dispersed;
- Kev sib xyaw ua ke: emulsion kua tuaj yeem ntxiv rau cov khoom siv nrog ntau yam organic nplaum thiab nplawm kom zoo (muaj cov organic fillers) rau kev sib xyaw; ntxiv qhov tsim nyog tus nqi ntawm stiffener yuav ua rau lub stiffener nrog ib tug tej yam hardness los txhim kho nws txhua yam khoom thiab aging kuj;
- Water-based stiffening txheej.
- IV. Daim ntawv thov ntawm tus neeg sawv cev stiffening hauv cov organic coatings, plastics, roj hmab thiab lwm yam lag luam
Kev siv cov tshuaj stiffeners hauv cov txheej txheej dej yog los hloov cov polyesters tsis muaj roj, copolymer emulsions, thiab lwm yam, uas tuaj yeem txhim kho kev ua tau zoo ntawm cov resins hluavtaws. Cov polymer stiffened tsis yog tsuas yog muaj qhov nyuaj zoo xwb, tab sis kuj muaj kev tiv thaiv dej zoo thiab kev tiv thaiv kev laus. Thaum siv, tus neeg sawv cev stiffening tuaj yeem diluted rau hauv cov tshuaj nrog qhov concentration ntawm 20-40%, thiab tom qab ntawd ntxiv rau hauv lub lauj kaub tshuaj rau cov tshuaj emulsification, thiab tom qab ntxiv cov tshuaj dilution tsim nyog, tuaj yeem tau txais cov emulsion stiffening siab. Thaum cov emulsion muaj ntau dua li qee qhov feem pua ntawm cov organic solvents, polymerization thiab decomposition yuav tshwm sim, uas yuav tsis tsuas yog txo qhov kev ua tau zoo ntawm cov resin tab sis kuj ua rau cov khoom siv lossis cov khoom laus. Yog li ntawd, ntxiv cov neeg sawv cev stiffening tsim nyog rau hauv cov txheej txheem tsim khoom thiab polymer tuaj yeem txhim kho nws cov txiaj ntsig siv thiab ua rau cov khoom muaj kev ywj pheej zoo dua thiab tiv thaiv kub siab.
- V. Ceev faj
- Tus neeg sawv cev stiffening yuav decompose rau hauv cov polar tshuaj nyob rau hauv qhov kub thiab txias thiab high humidity tej yam kev mob, yog li nws yuav tsum tau muab kaw thiab khaws cia kom tsis txhob to thiab paug ntawm cov khoom.
- Qhov chaw cia yuav tsum tau ventilated thiab qhuav, ua kom chav tsev qhuav.
- Zam kev tiv thaiv tshav ntuj.
- Ntxiv thiab siv maj mam thaum thov.
- Tsis txhob sib tov los yog dilute cov khoom nrog dej, los yog sib tov nrog lwm cov tshuaj tua kab mob, muab tub lim, pigments, fillers los yog pigments thaum siv.
- Nws yog nruj me ntsis txwv tsis pub sib tov nrog txhuas, mercury thiab lwm yam hnyav hlau additives.
Xav paub ntxiv txog SINOYQX hloov kho melamine formaldehyde resin, thov hu rau peb ntawm email: [email protected] , lossis hu rau peb ntawm: + 86-28-8411-1861.
Qee cov duab thiab cov ntawv luam tawm los ntawm Is Taws Nem, thiab cov ntawv pov thawj yog los ntawm tus sau thawj. Yog tias muaj kev ua txhaum cai, thov hu rau peb kom tshem tawm.