Shaanxi BLOOM Tech Co., Ltd. yog ib tug ntawm cov uas paub txog manufacturers thiab lwm tus neeg ntawm stearic acid hmoov cas 57-11-4 nyob rau hauv Suav teb. Txais tos rau cov lag luam wholesale bulk zoo stearic acid hmoov cas 57-11-4 muag ntawm no los ntawm peb lub hoobkas. Kev pabcuam zoo thiab tus nqi tsim nyog muaj.
Stearic acid hmoovyog ib tug saturated ntev - chain fatty acid derived los ntawm tej yam ntuj tso tsiaj thiab nroj tsuag roj (xws li butter, xibtes roj), nthuav raws li ib tug dawb mus rau daj me ntsis, nplua crystalline hmoov los yog nplai. Nws muaj lubricity zoo heev, stability thiab hydrophobicity, ua rau nws yog ib qho tseem ceeb "tag nrho- rounder" nyob rau hauv lub teb ntawm tshuaj pleev ib ce, zaub mov thiab kev lag luam. Hauv cov khoom tu tus kheej (xws li xab npum, qab zib), nws yog ib qho tseem ceeb shaping tus neeg sawv cev thiab emulsifier, txhim khu kev ntxhib los mos thiab ruaj khov; hauv kev lag luam khoom noj (raws li E570 additive), nws ua los tiv thaiv -foaming agent thiab lubricant; nyob rau hauv kev lag luam yas thiab roj hmab, nws kuj yog ib tug npaum demolding tus neeg saib xyuas thiab lubrication pab. Lub mechanism ntawm nws qhov kev txiav txim nyob rau hauv qhov tseeb hais tias ntev carbon saw nyob rau hauv lub molecule tau zoo cais cov tshuaj, txo kev sib txhuam, thiab ib txhij hloov cov nto ntawm cov ntaub ntawv. Cov khoom no ruaj khov nyob rau hauv chav tsev kub, tab sis nws yuav tsum tau muab kaw, tiv thaiv lub teeb, thiab muab cia rau hauv qhov chaw txias, qhuav kom tsis txhob muaj caking thiab oxidation.
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Tshuaj Formula |
C18H36O2 |
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Exact Mass |
284 |
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Molecular Luj |
284 |
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m/z |
284 (100.0%), 285 (19.5%), 286 (1.8%) |
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Elemental Analysis |
C, 76.00; H, 12.76; O, 11.25 |
Basic Properties thiab Storage Conditions
Stearic acid hmoovyog ib txwm tshwm sim saturated ntev - saw fatty acid nrog cov tshuaj formula C₁₈H₃₆O₂, muaj qhov hnyav molecular ntawm 284.48 g / mol. Nws daim ntawv hmoov yog dawb los yog daj me ntsis crystalline khoom nrog ib tug me ntsis fatty tsw. Lub melting point ntawm 67 mus rau 72 degree, lub boiling point yog kwv yees li 361 degree, thiab qhov ceev yog 0.84 g / cm³.
Solubility:Me ntsis soluble hauv dej txias (ntawm 23 degree, solubility yog kwv yees li 0.1 - 1 g/100 mL), yooj yim soluble nyob rau hauv organic solvents xws li ethanol, acetone, thiab chloroform.
Cov cai cia khoom:Nws yuav tsum tau muab kaw thiab khaws cia rau hauv qhov chaw txias thiab qhuav, tsis txhob muaj qhov kub thiab txias thiab tiv nrog oxidants. Rau daim ntawv hmoov, qhov pom zoo cia kub yog 2 - 8℃los tiv thaiv caking los yog decomposition; yog tias ntev - yuav tsum tau khaws cia (xws li ntawm -20℃), lub txee lub neej tuaj yeem txuas ntxiv mus rau 3 xyoos.
Core Application Areas thiab Kev Siv
Stearic acid hmoov, vim nws cov khoom siv tshuaj lom neeg tshwj xeeb, yog siv dav hauv ntau qhov chaw lag luam. Cov hauv qab no yog cov kev siv tshwj xeeb thiab cov txheej txheem ntawm kev txiav txim:
Tshuaj pleev ib ce thiab khoom tu tus kheej
Stearic acid yog cov khoom tseem ceeb hauv cov tshuaj pleev ib ce, feem ntau yog siv los ua emulsifier, thickener thiab stabilizer.
Emulsification:Hauv cov khoom qab zib xws li cov tshuaj pleev lub cev thiab cov tshuaj nplaum txias, stearic acid reacts nrog cov hauv paus (xws li potassium hydroxide) los ua stearate (xws li potassium stearate), tsim cov roj- hauv - dej emulsified system, uas ua rau cov khoom ruaj khov hauv kev ntxhib los mos thiab yooj yim rau kev thov.
Thickening thiab stabilization: Hauv cov khoom ua kua xws li tshuaj zawv plaub hau thiab ntxuav lub cev, stearic acid yog ua ke nrog cov surfactants los ua kom cov viscosity ntawm lub cev thiab tiv thaiv stratification.
Hom formula:
Tshuaj pleev ib ce: Stearic acid 15-20% + Glycerin 5-10% + Potassium hydroxide 0.5-1% + Dej seem.
Lipstick: Stearic acid 10-15% + Beeswax 5-10% + Cog roj seem, muab hardness thiab luster.
Kev lag luam yas
Stearic acid hmoovFeem ntau yog siv los ua cov roj nplua nyeem, demolding tus neeg saib xyuas thiab cov cua sov stabilizer hauv kev ua cov yas, txhim kho kev ua haujlwm thiab kev ua haujlwm ntawm cov khoom.
Lubrication nyhuv:Nyob rau hauv kev tsim cov polyvinyl chloride (PVC) kav thiab profiles, stearic acid tuaj yeem txo cov yaj viscosity, txo cov khoom siv, thiab tiv thaiv cov khoom adhesion rau pwm.
Thermal stabilizer:Thaum ua ke nrog cov ntsev hlau xws li calcium thiab zinc, nws tsim ib qho kev sib koom ua ke stabilizing system, inhibiting decomposition ntawm PVC los tsim hydrogen chloride gas, thiab ncua lub neej kev pab cuam ntawm cov khoom.
Cov lus qhia siv:
PVC kav: Stearic acid 0.5-1.5 phr (ib puas feem ntawm kev siv resin).
Polyethylene (PE) zaj duab xis: Stearic acid 0.1-0.3 phr, txhim kho zaj duab xis qhib cov cuab yeej.
Roj hmab kev lag luam
Stearic acid yog vulcanization activator thiab softener hauv cov qauv roj hmab, uas tuaj yeem txhim kho vulcanization efficiency thiab txhim kho lub cev ntawm cov roj hmab.
Kev txhawb nqa Sulfurization:Reacts nrog zinc oxide los tsim zinc stearate, uas yog ib qho nruab nrab hauv cov txheej txheem sulfurization, ua kom cov roj hmab hla - txuas thiab ua kom lub sijhawm sulfurization luv.
Cov nyhuv softening:Hauv cov khoom siv log tsheb thiab cov khoom siv conveyor, stearic acid tuaj yeem txo cov roj hmab hardness, txhim khu elasticity, thiab tiv thaiv kev laus thiab tawg.
Hom formula:
Ntuj roj hmab log tsheb: Stearic acid 1-3 phr + Zinc oxide 3-5 phr + Sulfur 2-4 phr.
Kev tsim cov roj lubricating
Stearic acid yog cov khoom siv raw rau lithium-raws li roj, calcium{1}}raws li roj, thiab lwm yam. Los ntawm cov tshuaj tiv thaiv saponification, nws tsim cov xab npum fibrous, muab cov roj lubricating zoo dej tsis kam thiab txhua yam ruaj khov.
Saponification txheej txheem:Muab cov stearic acid nrog lithium hydroxide (los yog calcium hydroxide) ntawm qhov kub thiab txias los tsim stearic acid lithium (los yog stearic acid calcium), thiab ces sib tov thiab sib tov nrog cov roj hauv paus.
Kev ua tau zoo zoo: Lithium-based grease has high pour point (>180 degree), muaj zog dej tsis kam, thiab lwm yam, thiab yog dav siv nyob rau hauv tsheb bearings, siv machinery, thiab lwm yam teb.
Lwm daim ntawv thov kev lag luam
Hlau ua:Raws li cov khoom siv siab heev rau kev txiav cov kua dej, nws txo cov cuab yeej hnav.
Textile auxiliaries:Nyob rau hauv cov ntaub softeners, stearic acid tuaj yeem txhim kho fiber ntau xav thiab ua kom cov luster.
Kev lag luam ntawv:Raws li tus neeg sawv cev sizing, nws txhim kho cov dej tsis kam ntawm daim ntawv.
Kev ua haujlwm nyab xeeb thiab ceev faj
Kev tiv thaiv tus kheej
Thaum lub sijhawm ua haujlwm, hnav lub ntsej muag plua plav (xws li N95), tsom iav, thiab hnab looj tes kom tsis txhob nqus cov hmoov los yog tawv nqaij.
Kev ruaj ntseg cia
Khaws kom deb ntawm qhov hluav taws kub thiab cov oxidants kom tiv thaiv kom tsis txhob muaj plua plav thiab qhov kev pheej hmoo ntawm kev tawg (txawm hais tias qhov kev pheej hmoo tawg ntawm cov plua plav stearic acid yog qhov tsawg, tseem yuav tsum tau ceev faj).
Kev pov tseg pov tseg
Cov khib nyiab yuav tsum tau ua raws li cov cai tswj kev siv tshuaj lom neeg kom tsis txhob muaj kuab paug ib puag ncig.
Stearic acid hmoovnthuav tawm thermal stability zoo heev. Nws cov ntsiab lus melting ntau yog 56-72 degree, thiab nws qhov kub kub yog siab li 232℃(ntawm 2.0 kPa siab) lossis 360-376℃(ntawm qhov kub siab decomposition). Cov yam ntxwv no ua rau nws muaj kev ruaj ntseg ntawm cov txheej txheem hauv qhov chaw ua haujlwm kub (xws li cov khoom siv yas thiab roj hmab vulcanization), thiab nws tsis tshua muaj kev puas tsuaj vim cua sov, yog li tsis cuam tshuam rau cov khoom zoo. Piv txwv li, nyob rau hauv kev tsim cov polyvinyl chloride (PVC) kav, stearic acid yog siv los ua ib lub tshav kub stabilizer, uas tuaj yeem tiv taus qhov kub thiab txias (feem ntau yog 160-200 degree) yam tsis muaj qhov tseem ceeb decomposition, zoo inhibiting thermal degradation ntawm cov khoom.
Thermal stability mechanism
Lub thermal stability ntawm stearic acid stems los ntawm nws cov qauv molecular:
Cov yam ntxwv ntawm ntev - chains saturated fatty acids: Cov saw hlau saturated carbon (tsis muaj ob daim ntawv cog lus) ntawm octadecanoic acid (C₁₈H₃₆O₂) txo qhov kev pheej hmoo ntawm oxidation thiab tawg ntawm qhov kub thiab txias, thiab lub zog intermolecular muaj zog, yuav tsum muaj kev cuam tshuam ntau dua ntawm cov qauv siv lead ua.
Hlau ntsev tsim: Stearic acid reacts nrog hlau ions (xws li calcium, zinc) los tsim cov hlau soaps (xws li calcium stearate, zinc stearate), thiab cov ntsev no ntxiv txhim kho thermal stability. Piv txwv li, calcium stearate hauv PVC qeeb decomposition los ntawm absorbing hydrogen chloride (HCl), thiab nws lub sij hawm ntev - thermal stability yog superior rau cov ntshiab stearic acid.
Synergistic nyhuv: Thaum ua ke nrog cov additives xws li epoxides thiab phosphite esters, stearic acid tuaj yeem tsim kom muaj kev sib koom ua ke ruaj khov, txhim kho qhov kub ntawm cov khoom.
Decomposition yam ntxwv thiab tej yam kev mob
Stearic acid tau decomposition nyob rau hauv cov xwm txheej tshwj xeeb, thiab txoj hauv kev tseem ceeb suav nrog:
High -kub decomposition:
Thaum lub siab ib txwm muaj: Thaum qhov kub siab tshaj 360 degree, stearic acid decomposes rau hauv stearic acid vapor thiab zinc oxide (yog tias nws yog coexisting nrog hlau oxides), los yog generates qis-molecular- hnyav hydrocarbons (xws li C₁₆H₃₄, C₂H₄).
Txo - ib puag ncig siab: Ntawm 250-255℃thiab 0.53-0.93 kPa cov xwm txheej, stearic acid tuaj yeem ua kom huv los ntawm kev faib ua feem. Lub sijhawm no, qhov decomposition by-products tsawg dua, thiab cov txheej txheem tseem ceeb yog lub cev evaporation.
Oxidation decomposition:
When exposed to high temperature (>200 degree) thiab oxygen rau lub sijhawm ntev, stearic acid tuaj yeem raug oxidation cov tshuaj tiv thaiv, tsim cov peroxides, aldehydes lossis carboxylic acids, ua rau cov khoom tawg lossis kev ua haujlwm tsis zoo. Piv txwv li, nyob rau hauv cov txheej txheem roj hmab vulcanization, yog tias qhov kub thiab txias tsis tswj kom zoo, cov khoom oxidation ntawm stearic acid tuaj yeem ua rau roj hmab aging.
Acid{0}}base catalytic decomposition:
Thaum ntsib cov acids muaj zog (xws li hydrochloric acid, sulfuric acid), stearic acid decomposes sai sai rau hauv fatty acids thiab hlau ntsev (xws li stearic acid zinc + HCl → stearic acid + ZnCl₂).
Nyob rau hauv ib qho kev mob alkaline (xws li sodium hydroxide tov), stearic acid dhau saponification cov tshuaj tiv thaiv, tsim stearic acid sodium thiab glycerol.
Kev siv hauv thermal tswj hauv kev xyaum
Kev lag luam yas: Stearic acid yog siv los ua lubricant thiab kub stabilizer. Cov txheej txheem kub yuav tsum tau tswj nruj me ntsis. Piv txwv li, nyob rau hauv PVC extrusion molding, qhov kub thiab txias yuav tsum tau tswj ntawm 160-180℃kom tsis txhob muaj ntau decomposition ntawm stearic acid; Yog tias ua ke nrog cov hmoov txhuas ntsev stabilizers, cov cua sov kuj tuaj yeem ua rau siab dua 200 degree.
Kev lag luam roj hmab: Stearic acid yog siv los ua tus neeg muag khoom thaum lub sij hawm vulcanization. Lub vulcanization kub yuav tsum tau tswj nyob rau hauv kev sib koom tes nrog sulfur thiab accelerators (feem ntau 140-}160 degree), tiv thaiv kom txhob ntxov decomposition ntawm stearic acid thiab tiv thaiv tsis txaus roj hmab cross-linking.
Kev tiv thaiv kev nyab xeeb: Thaum cov plua plav stearic acid nce mus txog qee qhov concentration hauv huab cua, nws tuaj yeem tawg thaum sib cuag nrog hluav taws (txawm tias qhov kev pheej hmoo tsawg, qhov cua thiab kev tiv thaiv plua plav tseem tsim nyog). Cov khoom decomposition (xws li stearic acid vapor) yuav tsum tau sau los ntawm cov khoom siv hauv zos kom tsis txhob muaj kev phom sij rau kev nqus pa.
FAQ
1. Nws yog dab tsi?
Lub ntuj saturated fatty acid muab rho tawm los ntawm cov tsiaj thiab cov nroj tsuag roj (xws li butter, xibtes roj), uas yog ib tug dawb, nplua hmoov los yog daim ntawv -zoo li cov khoom nyob rau hauv chav tsev kub.
2. Lub hom phiaj tseem ceeb yog dab tsi?
Daim ntawv thov tseem ceeb yog ua lub roj nplua nyeem, emulsifier thiab stabilizer. Nws yog dav siv hauv kev tsim cov xab npum, tshuaj pleev ib ce (kom nce viscosity), khoom noj khoom haus (anti-tus neeg sawv cev E570), plastics thiab roj hmab (kev pab cuam demolding).
3. Yuav ua li cas kom ruaj ntseg?
Muab kaw, khaws cia rau hauv qhov chaw txias thiab qhuav, tsis txhob tshav ntuj ncaj qha. Ua tib zoo saib xyuas cov dej noo tiv thaiv kom tsis txhob clumping.
4. Kev Tiv Thaiv Kev Nyab Xeeb?
Nws yog feem ntau suav hais tias muaj kev nyab xeeb, tab sis cov hmoov nplej siab tuaj yeem ua rau mob me ntsis rau lub qhov muag thiab ua pa. Nws raug nquahu kom hnav lub ntsej muag plua plav thiab tsom iav thaum ua haujlwm kom tsis txhob nqus cov plua plav.
Cim npe nrov: Stearic acid hmoov cas 57-11-4, lwm tus neeg, manufacturers, hoobkas, lag luam wholesale, yuav, nqe, tej, kev muag khoom