PMMA abu an fi sani da plexiglass, acrylic, da dai sauransu. Sunan sinadarai shine polymethyl methacrylate. PMMA abu ne mara guba da muhalli. Babban fasalin shine babban nuna gaskiya, tare da watsa haske na 92%. Wanda yake da mafi kyawun kaddarorin haske, watsawar UV shima har zuwa kashi 75%, kuma kayan PMMA shima yana da ingantaccen sinadarai da juriyar yanayi.
PMMA acrylic kayan ana amfani da su sau da yawa a matsayin acrylic zanen gado, acrylic filastik pellets, acrylic haske kwalaye, acrylic bathtubs, da dai sauransu The da ake ji kayayyakin na mota filin ne yafi m wutsiya fitilu, sigina fitilu, kayan aiki bangarori, da dai sauransu, da Pharmaceutical masana'antu (jini ajiya ajiya). kwantena), aikace-aikacen masana'antu (fayafai na bidiyo, masu rarraba haske)), maɓallan samfuran lantarki (musamman m), kayan masarufi (kofuna na sha, kayan rubutu, da sauransu).
Rashin ruwa na kayan PMMA ya fi na PS da ABS, kuma dankon narkewa ya fi damuwa da canje-canje a cikin zafin jiki. A cikin tsarin gyare-gyare, ana amfani da zafin jiki na allura musamman don canza dankowar narkewa. PMMA shine polymer amorphous tare da zafin jiki mai narkewa fiye da 160 ℃ da zafin jiki na bazuwar 270 ℃. Hanyoyin gyare-gyare na kayan PMMA sun haɗa da simintin gyare-gyare,allura gyare-gyare, machining, thermoforming, da dai sauransu.
1. Maganin robobi
PMMA yana da takamaiman shayar da ruwa, kuma adadin ruwansa shine 0.3-0.4%, kuma zafin ƙirar allura dole ne ya kasance ƙasa da 0.1%, yawanci 0.04%. Kasancewar ruwa yana sa narke ya bayyana kumfa, iskar gas, da rage bayyana gaskiya. Don haka yana buƙatar bushewa. A bushewa zafin jiki ne 80-90 ℃, da kuma lokacin ne fiye da 3 hours.
A wasu lokuta, ana iya amfani da 100% na kayan da aka sake fa'ida. Ainihin adadin ya dogara da buƙatun ingancin. Yawancin lokaci, zai iya wuce 30%. Ya kamata kayan da aka sake yin fa'ida su guje wa gurɓatawa, in ba haka ba zai shafi tsabta da kaddarorin samfurin da aka gama.
2. Zaɓin na'urar gyare-gyaren allura
PMMA ba shi da buƙatu na musamman don injunan gyare-gyaren allura. Saboda girman narkewar sa, ana buƙatar tsagi mai zurfi da babban diamita bututun ƙarfe. Idan ana buƙatar ƙarfin samfurin ya zama babba, ya kamata a yi amfani da dunƙule tare da rabo mafi girma don ƙirar ƙarancin zafin jiki. Bugu da ƙari, dole ne a adana PMMA a cikin busassun hopper.
3. Mold da ƙirar kofa
A mold-ken zafin jiki na iya zama 60 ℃-80 ℃. Diamita na sprue ya kamata ya dace da taper na ciki. Mafi kyawun kusurwa shine 5 ° zuwa 7 °. Idan kana son allurar 4mm ko fiye da samfurori, kusurwa ya kamata ya zama 7 °, kuma diamita na sprue ya kamata ya zama 8 °. Zuwa 10mm, gabaɗayan tsayin ƙofar kada ya wuce 50mm. Don samfuran da ke da kauri na bango ƙasa da 4mm, diamita mai gudu ya kamata ya zama 6-8mm, kuma samfuran da ke da kauri mai girma fiye da 4mm, diamita mai gudu ya kamata ya zama 8-12mm.
Zurfin ƙofofin diagonal, fan-dimbin ƙofofi da madaidaiciyar ƙofofin ya kamata ya zama 0.7 zuwa 0.9t (t shine kauri na bangon samfurin), kuma diamita na ƙofar allura ya zama 0.8 zuwa 2mm; don ƙananan danko, ya kamata a yi amfani da ƙananan girman. Ramin huɗa na gama-gari suna da zurfin 0.05 zuwa 0.07mm da faɗin 6mm.Rushewar gangaren yana tsakanin 30′-1° da 35′-1°30° a cikin ɓangaren rami.
4. zafin jiki na narkewa
Ana iya auna shi ta hanyar allurar iska: jere daga 210 ℃ zuwa 270 ℃, dangane da bayanin da mai siyarwar ya bayar.
5. zafin allura
Ana iya amfani da allura cikin sauri, amma don guje wa matsanancin damuwa na ciki, yakamata a yi amfani da allurar matakai da yawa, kamar jinkirin-sauri, da sauransu. Lokacin allurar sassa masu kauri, yi amfani da saurin gudu.
6. Lokacin zama
Idan zafin jiki ne 260 ℃, da zama lokaci kada ya wuce 10 minutes a mafi, kuma idan yawan zafin jiki ne 270 ℃, da zama lokaci kada ya wuce 8 minutes.
Lokacin aikawa: Mayu-25-2022
