Alkanolamines hauv Metalworking Fluids
Corrosion Inhibition, pH Control & Formulation Guide
Ib qho kev siv rau metalworking fluid formators thiab manufacturing engineers npog NBEA, BDEA, pH chemistry, corrosion mechanisms, mix-hlau systems, thiab cov tswv yim daws teeb meem.
📋 Hauv kab lus no
- Vim li cas cov dej ua haujlwm hlau xav tau alkanolamines
- Peb lub luag haujlwm: pH buffering, corrosion inhibition, emulsification
- pH buffering chemistry thiab qhov pib corrosion
- Corrosion inhibition mechanisms: NBEA vs BDEA
- Emulsion stabilization thiab xab npum tsim
- NBEA vs BDEA: taub hau- mus rau- lub taub hau kev sib piv
- Mixed{0}} hlau machining: ferrous, aluminium, thiab tooj liab alloys
- Biocide synergy thiab microbial tswj
- Siv cov qib thiab tsom kwm kev qhia kev qhia
- Sump tswj thiab saib xyuas
- Cov lus qhia daws teeb meem
- Cov lus nug uas nquag nug
1. Vim li cas cov dej ua haujlwm hlau xav tau Alkanolamines 💡
Cov kua dej ua haujlwm hlau ntsib ib puag ncig kev ua haujlwm tsis zoo. Cov txheej txheem txiav los yog sib tsoo ua kom muaj cua sov hauv zos (300-900℃ntawm lub cuab yeej / workpiece interface), cov hlau tsis tu ncua nrog lub zog saum npoo av, cov hlau zoo uas ua raws li pro- oxidant catalysts, thiab cov khoom siv tsis tu ncua ntawm oxygen- cov dej yaj uas ua rau cov aqueous corrosion. Yog tsis muaj kev tiv thaiv tshuaj lom neeg, dej -raws li cov khoom ua kom txias yuav corrode machined qhov chaw nyob rau hauv ib teev.
Alkanolamines daws cov teeb meem no los ntawm lawv cov amine dual - cawv ua haujlwm. Tsis muaj lwm chav kawm ntawm ib leeg - cov tshuaj ntxiv molecule ib txhij buffers pH, inhibits corrosion, thiab stabilizes emulsion system - uas yog vim li cas NBEA thiab BDEA muaj nyob rau hauv zoo li txhua semi- hluavtaws thiab soluble roj metalworking kua concentrate formulated thoob ntiaj teb.
⚖️
pH tsis haum
Khaws cov dej txias pH 8.5-9.5, ua kom cov hlau tsis muaj zog thiab inhibiting microbial kev loj hlob
🛡️
Corrosion Inhibition
Adsorbs rau saum npoo hlau los tsim cov yeeb yaj kiab tiv thaiv thaiv cov pa oxygen thiab dej nkag
🌊
Emulsification
Reacts nrog fatty acids nyob rau hauv -situ los tsim xab npum emulsifiers stabilizing cov roj- nyob rau hauv - dej dispersion
2. Peb Txoj Haujlwm: Lawv Sib Tham Li Cas ⚙️
Peb lub luag haujlwm ntawm alkanolamine hauv cov dej ua haujlwm hlau tsis yog ywj siab - lawv cuam tshuam thiab qee zaum sib tw. Ib koob tshuaj alkanolamine ntau dua nce pH zoo dua (zoo dua tiv thaiv corrosion thiab biocide synergy) tab sis kuj tseem tuaj yeem thawb lub coolant pH siab tshaj 9.5, uas ua rau corrosive rau txhuas. Kev nkag siab txog yuav ua li cas NBEA thiab BDEA pab sib txawv rau txhua txoj haujlwm tso cai rau cov tsim kom sib npaug ntawm qhov system kom zoo.
🔗 Peb -kev sib cuam tshuam
Thaum lub alkanolamine concentration nyob rau hauv lub coolant yog kom raug: (1) amine nitrogen txais protons los ntawm yaj CO₂ thiab carbonic acid nyob rau hauv lub coolant, tswj pH nyob rau hauv lub 8.5-9.5 tsis zones; (2) ib txhij, protonated amine molecules (R–NH₃⁺ lossis R₂NH₂⁺) adsorb mus rau cathodic hlau nto qhov chaw, txo cov pa oxygen txo; thiab (3) cov amine neutralizes dawb fatty acids nyob rau hauv lub concentrate los tsim xab npum surfactants ntawm cov roj - dej interface, stabilizing lub emulsion droplet loj. Tag nrho peb qhov cuam tshuam ua haujlwm ib txhij los ntawm tib lub molecule ntawm tib qhov concentration - uas yog vim li cas alkanolamines xa cov nqi tshwj xeeb - hauv - siv kev ua haujlwm zoo li ntau - cov khoom siv ntxiv.
3. pH Buffering Chemistry thiab Corrosion Threshold 🔬
Kev sib raug zoo ntawm cov dej txias pH thiab corrosion ntawm carbon steel ua raws li qhov zoo- qauv tsim: hauv qab pH 6, corrosion yog ceev thiab ceev; nruab nrab ntawm pH 6 thiab 8.5, corrosion qeeb tab sis tseem tseem ceeb; saum toj no pH 8.5, hlau passivation yuav siv sij hawm tuav thiab corrosion tus nqi poob dramatically. Lub hom phiaj kev khiav hauj lwm qhov rais rau feem ntau ferrous metalworking systems yogpH 8.8-9.3.
pH <6.0
Active corrosion tsam
Hlau yaj sai sai; microbial kev ua haujlwm siab; qhov chaw xeb hauv cov xuab moos
pH 6.0-8.5
Hloov chaw
Corrosion qeeb tab sis tsis tshem tawm; microbial kev loj hlob tseem ua tau siab dua pH 7
pH 8.5-9.5
✅ Lub hom phiaj kev khiav haujlwm
Hlau passive; microbes suppressed; aluminium tseem muaj kev nyab xeeb (hauv qab 9.5)
Alkanolamines tswj qhov pH qhov rais los ntawm buffering - tsis yog los ntawm kev nce pH ib zaug thiab tuav nws statically. Hauv kev pab cuam, lub coolant txuas ntxiv acidified los ntawm: yaj CO₂ los ntawm huab cua; carbonic thiab lwm yam organic acids los ntawm lubricant oxidation; biological acids los ntawm microbial metabolism; thiab chloride / sulfate paug los ntawm cov txheej txheem dej. Ib qho zoo alkanolamine tsis tiv thaiv tag nrho cov acidification txoj hauv kev ib txhij.
Buffer muaj peev xwm suav nrog:NBEA (pKa 10.0) muab kev tiv thaiv zoo thoob plaws pH 9.0–11.0. BDEA (pKa 8.8) buffers zoo tshaj plaws nyob rau hauv lub pH 7.8–9.8 qhov rais - uas aligns zoo dua nrog lub hom phiaj kev khiav hauj lwm ntau yam rau mixed ferrous/aluminium systems. Qhov no yog ib qho laj thawj vim li cas BDEA- muaj cov qauv tsim kom muaj pH ruaj khov dua lub neej ntev: qhov tsis sib npaug ntawm qhov sib npaug ntawm thaj tsam pH uas xav tau ntau dua li saum toj no.
4. Corrosion Inhibition Mechanisms: NBEA vs BDEA 🛡️
Ob leeg NBEA thiab BDEA inhibit corrosion, tab sis dhau los ntawm cov txheej txheem sib txawv uas muaj cov txiaj ntsig zoo rau kev tsim qauv thiab kev sib raug zoo hlau.
NBEA - pH- cov txheej txheem tseem ceeb
NBEA tus thawj amine (pKa 10.0) muaj zog buffers coolant pH mus rau qhov passive ntau yam rau hlau. Nyob rau hauv daim ntawv protonated (R–NH₃⁺), nws nqa cov nqi zoo uas electrostatically attracts nws mus rau cathodic qhov chaw ntawm cov hlau nto (uas nqa cov nqi tsis zoo tshaj thaum lub sij hawm txo cov pa oxygen ib nrab- tshwm sim). Qhov nocathodic inhibitionslows tus nqi ntawm oxygen txo, txo tag nrho cov corrosion tam sim no.
Qhov tshwm sim:Zoo heev pH rov qab zoo tom qab dilution lossis acidification txheej xwm; muaj zog pib tiv thaiv corrosion; zoo tshaj plaws rau ferrous-tseem ceeb machining ib puag ncig
BDEA - Zaj duab xis-tseem ceeb mechanism
BDEA qhov thib ob N-H daim ntawv cog lus thiab ob pawg -OH muabpeb cov ntsiab lus adsorption thauj tog rau nkojrau molecule. Qhov no multi-point attachment tsim ib tug denser, ntau tenacious tiv thaiv monolayer nyob rau hauv cov hlau nto tshaj ib zaug xwb -point amine adsorption. Cov yeeb yaj kiab ua raws li lub cev thaiv kev tiv thaiv, thaiv ob qho tib si oxygen thiab dej nkag mus rau cov hlau nto tsis hais txog ntawm cov dej txias pH. Qhov no yogsib xyaw inhibition(anodic thiab cathodic).
Qhov tshwm sim:Superior ntev - tiv thaiv corrosion raws li pH ib txwm drifts thaum lub neej sump; zoo dua sib xyaw- hlau ua haujlwm; nyiam rau aluminium- muaj cov khoom ua haujlwm
| Corrosion xeem / qauv | NBEA-raws li formulation | BDEA-raws li kev tsim |
|---|---|---|
| ASTM D4627 cam khwb cia hlau nti kuaj (24 teev) | Pass (0 spots at pH >9.0) | Pass (0 pH rau 8.5) |
| Cov dej tawv (500 ppm CaCO₃) corrosion kuj | Moderate (xws li xab npum nag lossis daus) | Zoo dua (cov ntsiab lus ntawm xab npum qis dua, nag lossis daus tsawg) |
| Aluminium corrosion (ASTM D4627 Al nti) | Kev pheej hmoo siab dua pH 9.5 | Kev nyab xeeb rau pH 9.2 - ntau zam txim |
| Ntev -lub sij hawm pH stability (6-lub lim tiam sump simulation) | pH poob 0.8-1.2 units hauv 6 lub lis piam | pH poob 0.4–0.7 units - ruaj khov dua |
| Hlau corrosion tus nqi (polarization nkhaus, mpy) | 0.8-1.5 mpy ntawm 5% dilution | 0.4-0.9 mpy ntawm 5% dilution |
5. Emulsion Stabilization thiab xab npum tsim 🌊
Soluble roj thiab semi- hluavtaws hlau ua hauj lwm kua concentrates muaj fatty acids (oleic, linoleic, siab roj fatty acids) ua lubrication thiab emulsification precursors. Cov fatty acids no tsis yog lawv tus kheej nto - nquag ntawm nruab nrab pH - lawv yuav tsum tau neutralized los ntawm alkanolamine los ua xab npum emulsifiers hauv -situ thaum lub sij hawm dilution nrog dej.
⚗️ Hauv -situ xab npum tsim cov tshuaj tiv thaiv
RCOOH + R′NH₂ → RCOO⁻ · R′NH₃⁺ (amine carboxylate soap)
Qhov tshwm sim amine carboxylate ntsev orients ntawm cov roj - dej interface nrog nws lub taub hau carboxylate nyob rau hauv cov dej theem thiab nws fatty acid tail nyob rau hauv cov roj theem - ib tug classic xab npum emulsifier qauv. Lub amine counterion (R′NH₃⁺) pab txhawb kev ruaj khov thiab tswj kev sib tshuam.
NBEA xab npum khoom
NBEA tus thawj amine forms mono- hloov ammonium soaps. Cov no yog cov dej ntau heev -soluble thiab muab cov emulsification zoo heev - tseem ceeb thaum lub sij hawm concentrate dilution kauj ruam. Thawj amine ntsev yog hydrophilic ntau dua li lwm cov amine ntsev, muab me me emulsion droplets tab sis muaj peev xwm tsis tshua muaj kev ruaj ntseg tiv thaiv coalescence dhau sij hawm hauv cov dej tawv.
BDEA xab npum khoom
BDEA's Secondary amine forms di- hloov ammonium soaps nrog ob pawg hydroxyethyl ntawm lub interface. Qhov ntau ntxiv no muab steric stabilization tiv thaiv tee dej coalescence - tshwj xeeb tshaj yog muaj txiaj ntsig zoo hauv cov dej tawv uas calcium ions nyiam txuas cov xab npum molecules thiab ua rau nag lossis daus. BDEA-raws li xab npum qhia tau zoo dua emulsion stability nyob rau hauv dav dej hardness ranges (txog 600–800 ppm CaCO₃).
6. NBEA vs BDEA: Lub taub hau- mus rau -Head Formulation Comparison 📊
| Formulation parameter | NBEA | BDEA |
|---|---|---|
| pH ntawm 5% dilution (tus qauv) | 9.0–9.5 | 8.7–9.2 |
| pH stability tshaj 6 lub lis piam kev pabcuam | 0.8-1.2 units | 0.4-0.7 units |
| Kev tiv thaiv corrosion | Zoo heev (pH{0}}dominant) | Zoo heev (zaj duab xis-dominant) |
| Aluminium corrosion kuj | Nruab nrab (pH tuaj yeem tshaj 9.5) | Tsawg (pH nyob hauv thaj tsam nyab xeeb) |
| Hard dej emulsion stability | Zoo rau 350 ppm CaCO₃ | Zoo rau 600-800 ppm CaCO₃ |
| Biocide kev sib koom ua ke (BIT / MIT) | Siab (pH siab) | Nruab nrab (pH qis me ntsis) |
| Vapor poob los ntawm cov dej kub | Nruab nrab (bp 199 degree, vp 0.3 hPa) | Tsawg heev (bp 274 degree, vp<0.01 hPa) |
| Daim tawv nqaij rhiab heev muaj peev xwm | Nruab Nrab (Skin Corr. 1B) | Lower (Irrit daim tawv nqaij. 2) |
| Hom kev siv qib hauv kev mloog zoo | 5-15% w/w hauv concentrate | 3-10% w/w hauv concentrate |
Qhov zoo tshaj plaws - muab ob qho tib si:Premium metalworking fluid concentrates feem ntau ua ke NBEA (5–10%) thiab BDEA (3–6%) es tsis yog cia siab rau ib leeg. NBEA muab pH rov qab sai thiab muaj zog pib corrosion inhibition; BDEA muab sijhawm ntev - tiv thaiv zaj duab xis thiab pH ruaj khov ntawm lub neej sump. Ib qho piv txwv hnyav yog 65:35 NBEA: BDEA - hloov kho raws li hom phiaj hlau thiab dej hardness ntau ntawm cov neeg siv khoom.
7. Mixed- Hlau Machining: Ferrous, Aluminium, thiab Copper Alloys 🔩
Niaj hnub nimno automotive thiab aerospace machining kab feem ntau ua ntau yam hlau ntawm tib lub coolant system - grey hlau cav blocks, txhuas lub tog raj kheej taub hau, tooj liab -beryllium bushings, thiab steel fasteners yuav tag nrho dhau los ntawm tib lub sump. Txhua cov hlau muaj qhov sib txawv ntawm cov tshuaj tiv thaiv corrosion thiab sib txawv pH kam rau ua, tsim kom muaj kev sib tw uas alkanolamine xaiv tuaj yeem daws lossis ua rau hnyav dua.
🔩 Grey / ductile hlau
Kev nyab xeeb pH ntau: 8.5-10.5
Hlau passivates nkag siab tshaj pH 8.5. Ob leeg NBEA thiab BDEA tau siv tau. Cov graphite zoo los ntawm cov hlau grey tuaj yeem yog pro-oxidant - BDEA txoj kev tsim zaj duab xis yog qhov tseem ceeb ntawm no los tiv thaiv galvanic coupling ntawm graphite thiab ferrite.
✈️Aluminium alloys
Kev nyab xeeb pH ntau: 6.5-9.2
Aluminium yog amphoteric - nws corrodes ob qho tib si hauv acid thiab muaj zog alkali. Tshaj pH 9.5, txhuas yaj sai sai (pitting, staining, dawb powdery deposits). Qhov no txwv tsis pub pH sab sauv thiab ua rau BDEA qis pKa thiab pH qab nthab qhov kev xaiv zoo tshaj plaws rau txhuas- muaj cov tshuab. Sodium silicate los yog azole inhibitors feem ntau yog co-formulated los muab txhuas-kev tiv thaiv tshwj xeeb.
⚡ tooj liab thiab tooj dag
Kev nyab xeeb pH ntau: 7.0-9.5
Copper alloys raug cuam tshuam rau corrosion nyob rau hauv alkaline daws thiab nyob rau hauv lub xub ntiag ntawm yaj oxygen. Alkanolamines ib leeg muab kev tiv thaiv tsis txaus rau tooj liab - benzotriazole (BTA) lossis tolyltriazole (TTA) ntawm 0.1–0.5% yuav tsum yog co-formulated raws li tooj liab- tshwj xeeb inhibitors. BDEA yog qhov zoo dua li cov alkanolamine tivthaiv vim nws qis pKa tswj pH hauv qab qhov pib qhov twg tooj liab oxidation nrawm dua pH 9.5.
| Hlau system | Lub hom phiaj pH | Pom zoo alkanolamine | Co-cov tshuaj tiv thaiv xav tau |
|---|---|---|---|
| Grey hlau nkaus xwb | 8.8–9.5 | NBEA thawj | Tsis muaj qhov tseem ceeb |
| Hlau + aluminium (automotive) | 8.8–9.2 | BDEA thawj + NBEA theem nrab | Silicate 0.3-0.8% |
| Hlau + tooj liab / tooj dag | 8.5–9.0 | BDEA thawj | BTA/TTA 0.1-0.3% |
| Titanium + hlau (Aerospace) | 8.5–9.0 | BDEA | Tsawg chloride dej; Tsis muaj halide inhibitors |
| Tag nrho cov hlau sib xyaw (Fe + Al + Cu) | 8.7–9.1 | BDEA 60% + NBEA 40% sib tov | BTA / TTA + Na silicate |
8. Biocide Synergy thiab Microbial Control 🦠
Microbial contamination - kab mob thiab fungi proliferating nyob rau hauv lub coolant sump - yog ib qho ntawm cov ua rau hlau ua hauj lwm kua dej tsis ua hauj lwm. Cov kab mob cov kab mob siab tshaj 10⁵ CFU/mL ua rau muaj kev txhim kho corrosion (microbially influenced corrosion, MIC), pH kev nyuaj siab, ntxhiab tsw, thiab kev noj qab haus huv txaus ntshai rau cov neeg ua haujlwm tshuab. Alkanolamines pab txhawb microbial tswj los ntawm ob lub tswv yim.
🦠 Cov tshuaj tiv thaiv kab mob ncaj qha
Ntawm pH saum toj no 9.0, daim ntawv uncharged (dawb puag) daim ntawv ntawm alkanolamine predominates. Pub dawb hauv paus amines yog daim nyias nyias - nquag - lawv muab faib rau hauv cov kab mob cell membrane, cuam tshuam cov membrane kev ncaj ncees thiab ua rau cov cell tuag. NBEA, nrog nws cov pKa siab dua thiab ntau dua ntawm cov hauv paus dawb ntawm kev ua haujlwm pH, qhia tau hais tias muaj zog ncaj qha tshuaj tua kab mob ntau dua li BDEA ntawm qhov hnyav sib npaug. Ntawm pH 9.2, kwv yees li 60% ntawm NBEA yog nyob rau hauv daim ntawv pub dawb, piv rau 80% rau BDEA - tab sis NBEA cov kev ua haujlwm hauv cov ntaub so ntswg ntau dua li kev them nyiaj.
🔬 Biocide potentiation (kev sib koom ua ke)
Cov biocides tseem ceeb siv nyob rau hauv cov khoom siv hlau niaj hnub no (BIT - benzisothiazolinone; MIT -} methylisothiazolinone; OIT - octylisothiazolinone; IPBC -} iodopropynyl butylcarbamate) muaj txiaj ntsig zoo dua li hauv qab no.5 ntawm pH. NBEA qhov muaj zog pH nce siab dua muab biocide potentiation zoo dua. Ib qho kev ua kom zoo ntawm qhov pH 9.0 yuav tsum tsuas yog 50-60% ntawm cov tshuaj biocide xav tau nyob rau hauv tib lub coolant ntawm pH 7.5 kom ua tau raws li qhov sib npaug microbial tswj - lub ntsiab lus txuag nqi.
9. Siv Cov Qib thiab Cov Ntsiab Lus Qhia Kev Qhia ⚗️
| Hom kua dej | NBEA hauv concentrate | BDEA hauv concentrate | Ua hauj lwm dilution |
|---|---|---|---|
| Soluble roj (Hom 1) | 8–15% | 4–8% | 3-10% concentration hauv dej |
| Semi-synthetic (Hom 2) | 6–12% | 3–7% | 3-8% concentration hauv dej |
| Synthetic (Hom 3) | 10–20% | 5–10% | 2-6% concentration hauv dej |
| Heavy-cov dej sib tsoo | 5–10% | 5–10% | 5-10% concentration hauv dej |
| xeb- tiv thaiv txheej | 3–8% | 5–12% | Siv undiluted los yog 1: 1 nrog dej |
Formulation sequence note:Thaum muab cov concentrates, ntxiv alkanolamines ua ntej fatty acids ua ntej -protonate cov amine ua ntej tsim xab npum. Ntxiv fatty acid ua ntej tuaj yeem ua rau cov nag lossis daus hauv cheeb tsam hauv qhov tsis sib xyaw ntawm cov batch. Cov kab ke kom raug rau ib nrab - cov khoom siv hluavtaws feem ntau yog: dej → txuas cov kuab tshuaj → alkanolamine → fatty acid → ntxhia roj → emulsifiers → additives (biocide, corrosion inhibitors, defoamer).
10. Sump Management and Monitoring 🔍
Thaum lub coolant nyob rau hauv kev pab cuam, tswj alkanolamine-raws li pH buffering yuav tsum tau saib xyuas. Cov kev ntsuas hauv qab no yuav tsum tau kuaj xyuas raws li lub sijhawm tsis tu ncua.
📅 Kev tshuaj xyuas txhua hnub
- pH- refractometer lossis pH meter; lub hom phiaj 8.8–9.2
- Nco ntsoov- refractometer nyeem (Brix) vs dilution daim ntawv
- Kev tshuaj xyuas qhov muag- xim, tsw, tramp roj txheej, ua npuas ncauj
📅 Kev tshuaj xyuas txhua lub lim tiam
- Microbial suav- dipslide kab lis kev cai (lub hom phiaj<10⁵ CFU/mL)
- Kev coj ua- nce conductivity qhia tias ntsev tsim - nce los yog paug
- Nitrite theem(yog siv) - khaws cia nyob rau hauv specification rau corrosion/biocide tshuav nyiaj li cas
- Tramp roj- skim yog tias pom txheej dhau 2-3 hli
📅 Kev tshuaj xyuas txhua hli
- Chloride thiab sulfate- nce chlorides ua kom corrosion;<200 ppm Cl⁻ target
- Tag nrho hardness- qhia rau saum-txoj kev kho dej
- Amine reserve- alkalinity titration los xyuas kom meej tias tsis muaj peev xwm seem
- Corrosion daim coupon- tshem tawm thiab hnyav txhua hli rau kev tsom xam
🔄 Kev ua kom raug
- pH qis dua 8.5→ ntxiv cov concentrated alkanolamine (NBEA pom zoo rau pH ceev rov qab) los yog ua kom - nce concentrate
- Cov kab mob siab heev→ poob siab - koob tshuaj biocide; kuaj pH; skim tramp roj
- Emulsion tsis ruaj khov→ xyuas dej hardness thiab chloride; ntxiv emulsion booster yog tias xav tau
- Corrosion ntawm qhov chaw→ nce concentration 1-2 refractometer units; tshawb xyuas cov neeg phem chloride qhov chaw
11. Cov lus qhia daws teeb meem 🛠️
| Cov tsos mob | Zoo li ua rau | Kho qhov kev txiav txim |
|---|---|---|
| pH poob sai (1+ units/lub lim tiam) | Kev tsim cov microbial acid; siab CO₂ los ntawm huab cua compressed; txheej txheem dej sulfate | Kab lis kev cai; koob tshuaj biocide poob siab; tshawb xyuas huab cua agitation qhov chaw; siv deionized saum- dej; ntxiv NBEA rau pH sai sai |
| Grey staining ntawm aluminium qhov chaw | pH too high (>9.5); aluminium yaj; los yog galvanic coupling nrog ferrous chips | Hloov NBEA rau BDEA kom qis pH qab nthab; ntxiv sodium silicate inhibitor (0.3-0.5%); nruab nti conveyor kom tshem tawm cov nplua sai dua |
| Emulsion splitting / tramp roj tsub zuj zuj | Cov dej nag los ntawm calcium soaps; siab tramp roj ingress tshaj emulsifier muaj peev xwm; kub kub | Ntsuas dej hardness; Hloov ntawm NBEA xab npum mus rau BDEA xab npum (nyuaj dej siab dua); ntxiv emulsion booster; nruab coalescer |
| Muaj zog amine tsw ntawm lub tshuab | NBEA concentration ntau dhau (siab vapor siab); coolant kub siab heev; Qhov cua tsis txaus | Txo NBEA hauv kev tsim; ib nrab hloov nrog BDEA (ntau qis vapor siab); xyuas qhov kub thiab txias; txhim kho LEV ntawm lub tshuab |
| xeb ntawm cov hlau qhov chaw txawm tias pH 9.0+ | Cov kab mob chloride siab; galvanic corrosion ntawm cov hlau tsis sib xws; tsis txaus zaj duab xis inhibitor | Test chloride (>200 ppm muaj kev pheej hmoo siab); txheeb xyuas qhov chaw muaj kab mob (cov kua dej ntws tawm, dej kais dej); nce BDEA rau kev tiv thaiv zaj duab xis; ntxiv carboxylate corrosion inhibitor |
| Cov neeg ua haujlwm ntawm daim tawv nqaij irritation tsis txaus siab | tawv nqaij rhiab heev los ntawm thawj amine ntawm siab concentration; pH siab dhau ntawm daim tawv nqaij | Saib xyuas qib NBEA; xav txog kev hloov ib nrab nrog BDEA (Skin Irrit. 2 vs Corr. 1B); tswj kev siv hnab looj tes; paub meej tias dilution yog lawm (dhau -kev sib xyaw ua ke yog ib qho ua rau) |
12. Cov lus nug uas nquag nug ❓
🔗 Cov nplooj ntawv ntsig txog cov khoom lag luam
N-Butylethanolamine (NBEA)
CAS 111-75-1 · Primary amine · bp 199℃· pKa 10.0
Primary alkanolamine rau pH buffering, corrosion inhibition, thiab emulsion tsim nyob rau hauv metalworking kua
N-Butyldiethanolamine (BDEA)
CAS 102-79-4 · Secondary amine · bp 274℃· pKa 8.8
Zaj duab xis- tsim cov tshuaj tiv thaiv corrosion; ntev -lub sij hawm pH stability; nyiam rau kev sib xyaw- hlau thiab txhuas- muaj cov tshuab
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Tham nrog Sinolook Chemical
Peb muab NBEA thiab BDEA rau metalworking kua formulation nyob rau hauv nruas, IBC, thiab bulk kom muaj nuj nqis nrog SGS{0}} ntawv pov thawj CoA, REACH ua raws li cov ntaub ntawv, thiab tag nrho cov kev pab cuam. Qauv thov txais tos.
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