Cov Qauv & Cov Lus Cim Tseem Ceeb 2-Methyl-2,4-pentanediol qauv (condensed mis):(CH₃)₂C(OH)–CH₂–CH(OH)–CH₃. C-2 tertiary hydroxyl thiab C-4 theem nrab hydroxyl pawg yog ob qho tib si muaj rau hydrogen bonding thiab tshuaj lom neeg cov tshuaj tiv thaiv, muab MPD exceptional solvency thiab compatibility. |Vim li cas nws thiaj hu ua hexylene glycol?MPD muaj rau carbon atoms (hex{0}}) thiab ob pawg hydroxyl (-ylene glycol). Hexylene glycol yog nws cov INCI (cov tshuaj pleev ib ce) thiab cov npe lag luam, dav siv hauv kev saib xyuas tus kheej cov npe. |4-Methyl-2,4-pentanediol vs 2-Methyl-2,4-pentanediol:Cov no yog positional isomers - 4-methyl-2,4-pentanediol (CAS 2004-69-5) muaj methyl pawg ntawm C-4 vs C-2 rau MPD. Lawv yog cov sib txuas sib txawv nrog cov khoom sib txawv; Tus qauv lag luam "hexylene glycol" yog hais txog 2-methyl-2,4-pentanediol isomer (CAS 107-41-5). |R-2-methyl-2,4-pentanediol:C-4 yog lub stereocenter - kev lag luam MPD yog tsim los ua cov racemate (R/S sib tov). Tus (R)-enantiomer tuaj yeem daws tau rau cov ntawv thov tshwj xeeb chiral synthesis.

Khoom Specification	Qib Industrial Txheej / Ntxuav / Tshuaj	Qib Tshuaj pleev ib ce Kev Kho Tus Kheej / INCI Hexylene Glycol
Qhov tshwm sim	Colorless pob tshab viscous kua, tsis pom impurities thiab sediment
Purity (GC)	Ntau dua lossis sib npaug li 99.5%	Ntau dua lossis sib npaug li 99.5%
Cov ntsiab lus dej	Tsawg dua lossis sib npaug li 0.1%	Tsawg dua lossis sib npaug li 0.05%
Xim (Pt-Co)	Tsawg dua los yog sib npaug li 10	Tsawg dua los yog sib npaug li 5
Boiling Point	197-198℃(1013 hPa)
Flash Point	93℃(kaw khob)
Hnyav Hlau	-	Tsawg dua lossis sib npaug li 10 ppm
Txee lub neej	12 lub hlis ( kaw, 5-30 degree)
Ntim	200 kg hlau nruas 1000 kg IBC tote	200kg HDPE nruas 1000 kg IBC tote

MPD yog qhov ua tau zoo -cosolvent thiab coalescing agenthauv dej-raws li txheej thiab xim latex. Raws li ib tug coalescing tus neeg sawv cev, nws ib ntus plasticizes latex polymer hais thaum lub sij hawm tsim zaj duab xis, txo qhov tsawg kawg nkaus zaj duab xis -forming kub (MFFT) thiab ua kom tsis tu ncua, tawg - cov yeeb yaj duab dawb txawm nyob rau hauv qis daim ntawv thov kub - tseem ceeb heev rau architectural thiab industrial coatings siv nyob rau hauv txias - huab cua.

Nwsleveling thiab flow zogtxo cov txhuam hniav, cov menyuam stippling, thiab txiv kab ntxwv -peel defects nyob rau hauv ob qho tib si dej-raws li thiab hnyav- cov coatings ua los. Nyob rau hauv inkjet thiab luam ntawv inks, MPD ua raws li ib tug humectant thiab viscosity regulator, tiv thaiv nozzle clogging thiab number case kom qhuav nyob rau hauv lub printhead thaum tswj kev daws teeb meem. Nws qhov kub kub kub (197-198 degree) txo qis evaporation poob thaum lub sij hawm cia thiab daim ntawv thov, txo VOC emissions piv rau sai dua -evaporating cosolvents.

Hauv qab nws lub npe INCIHexylene Glycol, MPD yog cov khoom siv tshuaj pleev ib ce uas siv dav hauv EU Kev Cai Tshuaj Txhuam Hniav (EC) Tsis muaj 1223/2009 thiab US FDA cov khoom xyaw tshuaj pleev ib ce pom zoo. Hauv kev tu tawv nqaij thiab kev tu plaub hau, nws ua haujlwm ntau yam:

Hom kev siv concentration:0.5–7.5%hauv tawm - rau thiab yaug - tawm cov khoom. EU Kev Tswj Xyuas Tshuaj pleev ib ce tso cai siv hexylene glycol yam tsis muaj kev txwv ntau hauv cov dej yaug-tawm cov khoom; mus txog 3.0% nyob rau hauv so- ntawm cov khoom ntsej muag raws li kev ntsuas kev nyab xeeb. Peb cov tshuaj pleev ib ce -qib hexylene glycol (Pt-Co xim Tsawg dua lossis sib npaug li 5, cov hlau hnyav tsawg dua lossis sib npaug li 10 ppm) ua tau raws li EU thiab Tuam Tshoj GB cov khoom siv raw khoom zoo nkauj.

MPD yog qhov ua tau zoo heevcoupling tus neeg sawv cevnyob rau hauv dej-raws li industrial tu formulations. Nws ob tus cwj pwm hydrophilic / hydrophobic txuas qhov tsis sib xws ntawm cov dej thiab cov av oily, ua rau cov surfactants kom ua tiav kev ntxuav tob dua ntawm cov roj, cov roj ntxhia, thiab cov khoom seem ntawm cov hlau. Tsis zoo li glycol ethers, nws muaj qis toxicity thiab zoo ib puag ncig profile thaum tuav muaj zog coupling efficiency.

Hauvhlau ua kua(txiav roj, coolants), MPD ua hauj lwm raws li ib tug cosolvent, biostability tus neeg sawv cev, thiab antifreeze additive, txhim kho qhov qis -kub fluidity thiab khov- taw tes depression ntawm dej- raws li emulsion systems. Nws qhov kub kub ua rau txo qis evaporation poob los ntawm kev qhib cov kua dej reservoirs, ua kom cov dej ua haujlwm ntev thiab txo qhov siab tshaj - nce zaus.

MPD yog qhov nruab nrab hauv kev sib txuas ntawmplasticizers(raws li esterification diol nrog cov organic acids),tshwj xeeb surfactants(ether sulfonates, glucoside esters), thiabtshuaj tua kab formulations(raws li cosolvent rau agrochemical concentrates, txhim kho solubility ntawm cov khoom xyaw nquag). Hauv polyurethane chemistry, cov qauv diol branched qhia soft-seg yooj yooj yim thiab txo cov crystallinity hauv polyol chains. MPD lub siab kub kub thiab dej miscibility kuj ua rau nws muaj txiaj ntsigtshuaj tiv thaiv hnyav thiab tus neeg sawv cev extractionrau aqueous cov tshuaj tiv thaiv kab mob uas cov pa kuab tshuaj theem - cais.

Khoom	MPD (Hexylene Glycol) CAS Nr .: 107-41-5	Propylene Glycol CAS 57-55-6 Nr	Dipropylene Glycol CAS: 110-98-5 Nr	1,3-Butylene Glycol CAS Nr .: 107-88-0
Boiling Point	197-198 degree	188 degree	232 degree	207 degree
Flash Point	93 degree	99 degree	124 degree	121 degree
Dej tsis sib haum	Tag nrho ✓	Tag nrho ✓	Tag nrho ✓	Tag nrho ✓
Tawv tawv	Lub teeb, tsis yog -greasy ✓	Me ntsis hnyav	Zoo	Zoo
Qhov tseem ceeb tshaj	Dual solvency + coalescing + preservative boost	Tus nqi qis, GRAS xwm txheej	Siab BP, tsawg volatility	Cov qauv tshuaj pleev ib ce

⚠️ CEEB TOOM:MPD (hexylene glycol) yog acombustible kua (flash point 93 degree)thiab tawv nqaij / qhov muag khaus. GHS qeb: Flammable Liquid Qeb 4, Daim tawv nqaij Irritation qeb 2, Qhov muag Irritation qeb 2A. Nws yog qhov tsis txaus ntseeg tsawg dua li cov kuab tshuaj ua lag luam feem ntau tab sis tus qauv PPE yuav tsum tau ua.

Tus nqi ntau:Kev txiav txim siab dua lossis sib npaug rau 10 MT feem ntau qhib 8-12% luv nqi vs me nruas xaj. IBC tote tus me nyuam txo ib tug - tuj freight vs ib tug neeg 200 kg nruas los ntawm 5–8%. Ntev -cov ntawv cog lus muab khoom siv (lub hlis twg lossis ib xyoos) muab cov nqi ruaj khov txuas nrog acetone feedstock index.Thov ib tug tam sim no MPD nqe quote →

Q: Puas yog hexylene glycol zoo ib yam li 2-methyl-2,4-pentanediol?

Yog -hexylene glycol yog cov npe thiab INCI rau 2-methyl-2,4-pentanediol(CAS 107-41-5). Nyob rau hauv cov khoom xyaw tshuaj pleev ib ce, nws yeej ib txwm teev raws li "Hexylene Glycol." Hauv kev lag luam kev lag luam thiab cov ntaub ntawv tshuaj lom neeg, IUPAC lub npe 2-methylpentane-2,4-diol los yog cov ntawv luv MPD yog siv. Cov npe "methyl-2,4-pentanediol," "2-metil-2,4-pentanediol" (Spanish/Portuguese spelling), thiab "2,4-pentandiol" yog cov lus tsis sib xws lossis cov lus hauv cheeb tsam rau tib lub ntsiab lus.

Q: Cov qauv (condensed formula) ntawm 2-methyl-2,4-pentanediol yog dab tsi?

Covcondensed qauv qauv2-methyl-2,4-pentanediol yog(CH₃)₂C(OH)–CH₂–CH(OH)–CH₃. Expanded: cov molecule muaj 5-carbon qaum qaum nrog ib ceg methyl ntawm C-2, muab rau nws rau carbons tag nrho. C-2 txoj hauj lwm dais ib pawg tertiary hydroxyl (–OH flanked los ntawm ob pawg methyl thiab cov saw), thaum C-4 dais ib nrab hydroxyl. Qhov no branched, asymmetric qauv tiv thaiv molecular packing, ua rau ib tug tsawg-melting (-50 degree), uas tsis muaj-viscosity kua nrog muaj zog thiab dav solvency. Cov mis mos molecular yog C₆H₁₄O₂, MW=118.17 g/mol.

Q: Qhov txawv ntawm 2-methyl-2,4-pentanediol thiab 4-methyl-2,4-pentanediol yog dab tsi?

4-Methyl-2,4-pentanediol(CAS 2004-69-5) yog ib qho chaw isomer uas cov ceg methyl nyob ntawm C-4 tsis yog C-2. Nws yog structurally txawv ntawm 2-methyl-2,4-pentanediol thiab muaj ntau yam physicochemical zog thiab kev lag luam daim ntaub ntawv. Standard coj mus muag hexylene glycol / MPD ib txwm hais txog cov2-methyl-2,4-pentanediol isomer (CAS 107-41-5). Thaum qhia txog kev txiav txim, nco ntsoov lees paub tus lej CAS 107-41-5 kom tsis txhob muaj kev ntxhov siab ntawm isomers.

Q: Puas yog hexylene glycol muaj kev nyab xeeb rau kev siv tshuaj pleev ib ce? Nws txoj cai lij choj EU yog dab tsi?

Hexylene glycol (2-methyl-2,4-pentanediol) tau pom zoo rau kev siv tshuaj pleev ib ceEU Kev Cai Tshuaj Txhuam Hniav (EC) No 1223/2009thiab tau teev nyob rau hauv CosIng database. EU's Scientific Committee on Consumer Safety (SCCS) tau soj ntsuam hexylene glycol thiab txiav txim siab tias nws muaj kev nyab xeeb rau kev siv tshuaj pleev ib ce ntawm ntau txog 7.5% nyob rau hauv so- ntawm cov khoom. Nws yog dav siv ntawm 0.5-3.0% raws li ib tug humectant, emollient, thiab preservative booster. Nws yogtsis raug cais raws li CMR (carcinogenic, mutagenic, lossis reprotoxic).thiab tsis txwv los yog txwv tsis pub nyob rau hauv EU tshuaj pleev ib ce. Peb cov tshuaj pleev ib ce - qib MPD ua tau raws li tag nrho cov qauv purity xav tau rau daim ntawv thov kev saib xyuas tus kheej.

Q: 2-methyl-2,4-pentanediol ua li cas?

MPD yog tsim los ntawm kev lag luam ntawm ob - cov txheej txheem: (1)Aldol condensation ntawm acetonelos tsim diacetone cawv (DAA): 2 CH₃COCH₃ → (CH₃)₂C(OH)CH₂COCH₃; (2)Selective catalytic hydrogenation ntawm DAAdhau ntawm tooj liab lossis npib tsib xee catalyst nyob rau hauv nruab nrab hydrogen siab los muab MPD: (CH₃)₂C(OH)CH₂COCH₃ + H₂ → (CH₃)₂C(OH)CH₂CH(OH)CH₃. Kev xaiv hydrogenation ntawm pawg ketone (tawm ntawm cov dej cawv tertiary tsis zoo) yuav tsum tau ceev faj thiab tswj xyuas tus mob. Cov khoom yog purified los ntawm multi-theem distillation mus rau ntau dua los yog sib npaug rau 99.5% purity. Cov nqi ntawm cov khoom siv raw yog li txuas nrog acetone cov nqi lag luam.