N'ihi usoro mmepụta nke urea formaldehyde resin, mmepe nke ụlọ ọrụ melamine enwetawo usoro dị ngwa ngwa.Akwụkwọ nyocha nke mbụ kọrọ njikọ nke melamine resin na 1933. Ụlọ ọrụ America Cyanamide malitere ịmepụta na ire melamine powder laminates na coatings wdg na 1939. Na 1950s na 1960s, Japan ghọtara na mmepụta zuru ezu nke mmepụta ihe.melamine ịkpụzi ogige.N'afọ ndị 1960, China malitere iwebata teknụzụ mmepụta melamine.Mgbe ọtụtụ iri afọ nke mmepe gasịrị, ikike mmepụta nke ngwaahịa melamine bụ ugbu a kachasị elu n'ụwa, na-aza ihe karịrị 80 9/6 nke ahịa ahịa ụwa.
Iji marakwuo banyere melamine ntụ ntụ, ka anyị leba anya na usoro mmepụta nke melamine ntụ ntụ.
Isi akụrụngwa nke ngwaahịa melamine bụ melamine ịkpụzi ogige, makwaara dị ka melamine formaldehyde resin ntụ ntụ ma ọ bụ melamine ntụ ntụ.Isi akụrụngwa nke melamine ntụ ntụ bụ melamine resin na nnukwu reactivity na crosslinkability.The melamine resin bụ a elu-dandelion polymer synthesized site kemịkalụ mmeghachi omume nke melamine na aqueous formaldehyde ngwọta n'okpuru ọnọdụ siri ike.A na-emekarị mmeghachi omume na reactor nke nwere ihe na-akpali akpali, kpo oku na condensing, n'ozuzu na nzọụkwụ abụọ.
1. Nzọụkwụ mbụ bụ mmeghachi omume mgbakwunye.Nke mbụ, tinye 37% aqueous formaldehyde ngwọta na mmeghachi omume arịa ma mezie pH na 7-9 iji nweta ihe na-anọpụ iche ma ọ bụ na-adịghị ike alkaline ọkara.Mgbe ahụ gbakwunye melamine kwesịrị ekwesị iji mee ka moore formaldehyde na melamine dị n'etiti 2 na 3. A na-edozi okpomọkụ nke reactor nke mere na ọ na-eji nwayọọ nwayọọ na-ekpo ọkụ ruo 60-85 Celsius C. N'oge a, formaldehyde na melamine na-egbochi mmeghachi omume methylolation. , na melamine oligomer linear nwere 1 ruo 6 otu methylol.Mmeghachi omume n'elu bụ mmeghachi omume exothermic na-adịghị adị.Ka ọnụ ọgụgụ formaldehyde dị elu, ọ na-adị mfe ịmepụta polymethylol melamine.
2. Nzọụkwụ nke abụọ bụ mmeghachi omume condensation.N'okpuru ọnọdụ okpomọkụ dị elu, methylol melamine na-arụ ọrụ nke ukwuu na-emewanyewanye ma ọ bụ polycondensed iji mepụta njikọ resin linear nke nwere njikọ methylene ma ọ bụ dimethylene ether bond.site na intramolecular ma ọ bụ molekụla n'ime ebe etiti acidic.Mgbe ọnụ ọgụgụ nke methylol dị ntakịrị, njikọ methylene na-emekarị;N'ime resin nke sorghum, a na-emepụta njikọ dimethylene ether n'ozuzu, na njikọ methylene na-etolite.Ọnụ ọgụgụ dị ukwuu nke condensation nke mmeghachi omume polycondensation, na-ebelata mmiri solubility nke melamine formaldehyde resin ngwọta na nnukwu viscosity.
N'ime usoro mmeghachi omume dị n'elu, a na-ekpebi ịdị arọ molekụla nke ngwaahịa ikpeazụ site na ọnọdụ mmeghachi omume kpọmkwem, na mmiri solubility nke ngwaahịa na-agbanwekwa nke ukwuu.Ụdị ngwaahịa dị n'ọtụtụ ebe site na resin ngwọta na-adịghị mma soluble na-adịghị ike soluble na infusible siri ike.Ngwọta resin nwere nkwụsi ike na-adịghị mma ma ọ dịghị mma maka nchekwa.Na mmepụta n'ezie, a na-ejikarị ya eme ihe dị ka ihe na-emepụta ihe na-emepụta ihe ndị dị ka d-cellulose, osisi pulp, silica, colorants.A na-eme ya ka ọ bụrụ uzuzu siri ike nke bụ ihe a na-akpọ melamine ntụ ntụ site na igwe igwe na-ehicha bọọlụ.
Huafu Chemicals bụ ụlọ ọrụ mmepụta ihemelamine resin ntụ ntụ.Ọ bụrụ na ị nwere mmasị, biko kpọtụrụ anyịEmail : melamine@hfm-melamine.com
Oge nzipu: Sep-20-2019