Melamine hmoov is a vital nitrogen heterocyclic organic chemical raw material. Stable under average temperature and pressure, soluble in hot water, slightly soluble in cold water, very slightly soluble in hot ethanol, insoluble in ether, benzene and carbon tetrachloride, soluble in methanol, formaldehyde, acetic acid, hot ethylene glycol, glycerol, pyridine, etc. Low toxicity. It is generally stable, but it may decompose and release cyanide at high temperatures. It is weakly alkaline (PKB = 8) and can form melamine salt with hydrochloric acid, sulfuric acid, nitric acid, acetic acid, oxalic acid, etc.
Cov khoom siv tseem ceeb rau kev tsim cov melamine-formaldehyde resin yog siv los ua cov khoom siv tshuaj ntsuam xyuas reagent, kuj tseem siv rau hauv kev sib txuas ntawm cov organic resin, ua tus neeg sawv cev tanning thiab muab tub lim rau cov tawv nqaij. Melamine resin tuaj yeem npaj los ntawm condensation polymerization nrog formaldehyde. Nws tuaj yeem siv rau hauv kev lag luam yas thiab txheej txheej thiab tseem tuaj yeem siv los tiv thaiv -wrinkle Txawm li cas los xij vim tias nws muaj kev phom sij rau tib neeg lub cev, nws tsis tuaj yeem siv rau hauv kev ua zaub mov lossis khoom noj khoom haus ntxiv.
Hais txog kev ua haujlwm thiab kev siv, melamine muaj ntau yam kev pabcuam, thiab raws li cov khoom siv raw, nws tau dav tsim thiab muag vim nws tus nqi qis thiab zoo. Nrog urea raws li cov khoom siv raw, Qhov no kuj tau ua rau muaj kev nthuav dav loj ntawm melamine ntau lawm hauv Suav teb, ua rau muaj kev sib tw hnyav ntawm cov tuam txhab suav melamine thiab cov khoom lag luam nce nqi hauv kev lag luam. Nws yog 582 melamine resin npaj nrog formaldehyde thiab butanol ua raw khoom. Nws muaj cov txiaj ntsig zoo raws li tus neeg sawv cev theem rau cov kuab tshuaj-raws li polyurethane txheej. Nws tuaj yeem siv rau hauv kev lag luam yas thiab txheej txheej. Nws kuj tseem tuaj yeem siv los tiv thaiv folding thiab tiv thaiv -shrinkage kho tus neeg saib xyuas rau textile fabrics.
Nws yuav tsum raug sau tseg tias tom qab melamine nkag mus rau hauv tib neeg lub cev, kev hloov pauv tshuaj (hydrolysis) tshwm sim los tsim cyanuric acid. Cyanuric acid thiab melamine tsim ib tug dav network qauv thiab ua rau pob zeb. Tsuas yog thaum melamine thiab cyanuric acid muaj nyob rau hauv cov zaub mov, ib txhij, lawv puas tsim kev hem thawj rau kev noj qab haus huv ntawm cov me nyuam mos. Txawm hais tias melamine thiab cyanuric acid yuav ua rau lub raum pob zeb nyob rau hauv kev sib koom ua ke ntawm melamine thiab cyanuric acid, melamine yuav ib nrab hydrolyzed rau hauv cyanuric acid nyob rau hauv lub siab acidic ib puag ncig ntawm lub plab. Yog li ntawd, ntev npaum li casmelamine powderyog muaj, nws yog sib npaug rau cyanuric acid. Nws qhov kev puas tsuaj tseem yog los ntawm cyanuric acid, uas yog teeb meem rau tib neeg lub cev, yog li nws tsis tuaj yeem siv rau hauv kev ua zaub mov lossis khoom noj khoom haus ntxiv.