Na te hanga o te kapia urea formaldehyde, he tere te tere o te whanaketanga o te umanga melamine.Ko te tuhinga rangahau i korero tuatahi i te whakahiatotanga o te kapia melamine i te tau 1933. I timata a America Cyanamide Company ki te whakaputa me te hoko i nga raima paura melamine me nga paninga me etahi atu i te tau 1939. I nga tau 1950 me 1960, i mohio a Japan ki te katoa o nga mahi ahumahi.pūhui niao melamine.I te tekau tau atu i 1960, ka timata a Haina ki te whakauru i te hangarau hanga melamine.I muri i nga tekau tau o te whakawhanaketanga, ko te kaha whakaputa o nga hua melamine inaianei ko te teitei rawa atu i te ao, neke atu i te 80 9/6 o te wahanga maakete o te ao.
Kia mohio ai tatou mo te paura melamine, me titiro tatou ki te mahi hanga paura melamine i te tuatahi.
Ko te mea matua o nga hua melamine ko te melamine molding compound, e mohiotia ana ko te melamine formaldehyde resin paura melamine paura ranei.Ko te rauemi mata matua o te paura melamine ko te kapia melamine me te tauhohenga teitei me te honohono.Ko te kapia melamine he polymer teitei-dandelion i whakahiatohia e te tauhohenga matū o te melamine me te wairewa formaldehyde wai i raro i nga tikanga tino.I te nuinga o te wa ka mahia te tauhohenga i roto i te reactor kua oti te whakakorikori, te whakamahana me te whakawera, e rua nga kaupae.
1. Ko te mahi tuatahi ko te tauhohenga taapiri.Tuatahi, tāpirihia te 37% wairewa formaldehyde wai ki te oko tauhohenga me te whakatika i te pH ki te 7-9 kia whiwhi ai i te reo kawakore, ngoikore ranei.Katahi ka tapirihia he melamine e tika ana hei hanga i te moore formaldehyde me te melamine i waenga i te 2 me te 3. I whakatikatikahia te pāmahana o te reactor kia ata whakamahana ki te 60-85 ° C. I tenei wa, ka aukatihia te formaldehyde me te melamine e te tauhohenga methylolation. , me te oligomer melamine raina kei roto i te 1 ki te 6 nga roopu methylol i hangaia.Ko te tauhohenga i runga ake nei he tauhohenga exothermic korekore.Ko te teitei o te wahanga o te formaldehyde, he ngawari ake te hanga polymethylol melamine.
2. Ko te mahi tuarua ko te tauhohenga condensation.I raro i nga ahuatanga o te pāmahana teitei, ko te melamine methylol tino tauhohenga ka whakahaehae, ka polycondensed ranei hei whakaputa i tetahi puhui kapia raina honohono kei roto he here methylene, he here dimethylene ether ranei.na roto i nga tikanga ngota ngota ranei i roto i te taiao reo waikawa.Ina he iti te nui o te roopu methylol, ko te herenga methylene te nuinga;i roto i te kapia-sorghum, ka hangaia he here dimethylene ether, ka hangaia he here methylene.Ko te nui ake o te tohe o te tauhohenga polycondensation, ka iti ake te wairewa o te wairewa melamine formaldehyde resin me te nui ake o te pokey.
I roto i te tukanga tauhohenga i runga ake nei, ko te taumaha ngota o te hua whakamutunga ka whakatauhia e nga tikanga tauhohenga motuhake, a ka tino rerekee te wairewa o te hua.Kei te watea whanuitia nga momo hua mai i nga otinga kapia ki nga totoka ngoikore me te kore e rewa me te whakauru.Ko te otinga kapia he ngoikore te pumau, kaore e pai ki te tiaki.I roto i te hanga tūturu, he maha nga wa e whakamahia ana hei tïpako me nga taonga pararopi penei i te d-cellulose, te penupenu rakau, te silica, ka taapirihia nga tae.Ka mahia hei paura totoka he paura melamine e kiia nei e te mira rehu whakamaroke poroporo.
Ko Huafu Chemicals he wheketere whakaputapaura kapia melamine.Mena kei te pirangi koe, tena koa whakapiri mai ki a maatauEmail : melamine@hfm-melamine.com
Wā tuku: Sep-20-2019