Caaga polyurethane (PU)
* Polyurethane (PU) waa soo gaabinta polyurethane, polyisocyanate iyo polyhydroxy polymer polymerization, waxay ku jirtaa silsiladda ugu weyn ee polymers oo ka kooban qaybo badan oo silsilad urethane ah oo soo noqnoqda (-NHCOO-) ee xeryahooda polymer.
* Alaabooyinka balaastiigga ah ee PU ee la habeeyay
Polyurethane, oo sidoo kale loo yaqaan polyurethane iyo polyurethane, waa nooc ka mid ah macromolecules oo ka kooban unugyo sifooyin urethane ah oo ku jira silsiladda ugu weyn. Maaddada polymer ee noocan oo kale ah waxay leedahay labadaba balaastigga caagga ah iyo xoogga iyo waxqabadka farsamaynta ee caagga ah, waxayna leedahay qiimo codsi oo muhiim ah toddobada qaybood ee waaweyn ee caagadaha, caag, xumbo, fiber, dahaarka, dhejiska iyo polymers functional. Warshadaha waxa si weyn loogu isticmaalaa taayirrada xawaarahoodu yar yahay, gaasaska, dermooyinka baabuurta iyo goobo kale. Nolol maalmeedka, polyurethane waxaa loo isticmaalaa in lagu sameeyo noocyo kala duwan oo xumbo ah iyo isbuunyo caag ah.
Maxaad ku samayn kartaa PU Plastic?
Elastomers Polyurethane waa nooc ka mid ah maaddooyinka leh caag iyo caag labadaba, oo leh awood cufan oo wanaagsan, xoogga jeexjeexa, caabbinta saameynta, caabbinta abrasion, caabbinta cimilada, caabbinta hydrolysis, caabbinta saliidda iyo faa'iidooyinka kale.
Inta badan loo isticmaalo sida qalab dhismeed (sida tuubooyinka, gaasaska, suumanka, rollers, gears, tuubooyinka, iwm), dahaarka, kabaha kabaha iyo taayirada adag. Tusaale ahaan, sida saxan shaandho macdaneed, waxay leedahay qaylo hoose, xajin sare iyo xirashada caabbinta marka loo eego saxan shaandho dhaqameed. Intaa waxaa dheer, polyurethane waxay leedahay biocompatibility aad u fiican, sida walxaha biomedical, waxaa loo isticmaali karaa qalabka wadnaha, xididdada dhiigga ee macmalka ah, lafo macmal ah, iwm.
Kuwa soo socda waa qaar ka mid ah codsiyada polyurethane (PU)
- Gaadiidka
- Dhismaha
- Mashiinada
- Qalabka elegtarooniga ah
- Alaabta guriga
- Habaynta cuntada
- Dharka iyo dharka
- Maqaarka synthetic
- Daabacaadda
- Warshadaha kiimikada
- Ciyaaraha
- Daryeelka caafimaadka
Sifooyinka Polyurethane (PU)
* Xumbada Polyurethane waxay u qaybsantaa 2 nooc: xumbo adag iyo xumbo dabacsan, oo leh barti aad u fiican, dherer, xoog cadaadis iyo dabacsanaan, iyo sidoo kale xasilloonida kiimikada wanaagsan. Intaa waxaa dheer, xumbada poliurethane waxay leedahay habsocod heer sare ah, adhesion, dahaarka iyo waxyaabo kale, oo ka tirsan waxqabadka wanaagsan ee alaabta barkinta.
Elastomer Polyurethane sababtoo ah qaab-dhismeedkiisu wuxuu leeyahay qaybo silsilado ah oo jilicsan, adag 2, sidaas darteed silsiladda molecular waxaa loo qaabeyn karaa si ay u siiso walxaha xoogga sare, adkaanta wanaagsan, xirashada, saliidda u adkaysta iyo sifooyin kale oo aad u fiican, oo loo yaqaan " xirashada u adkaysta caag" polyurethane isla mar ahaantaana leh barti sare ee caagga iyo qallafsanaanta caaga ah.
* Walxaha poliurethane waxay leeyihiin polarity xoog leh, taas oo ka dhigaysa inay awood u yeeshaan inay si adag ugu xidhmaan alaabooyinka intooda badan waxaana loo isticmaali karaa koollo ahaan goobta isku xidhka.
* Xabagta polyurethane waxaa inta badan loo isticmaalaa baakadaha, dhismaha, alwaaxyada, baabuurta, iyo warshadaha kabaha.
Sidee loo sameeyaa maadada Polyurethane (PU)?
Sababtoo ah hydrophobicity xooggan ee polyurethane, hab cusub oo isku dhafan waa in loo adeegsadaa si loo diyaariyo emulsion PU, habka isku dhafka ah ee polyurethane ee biyaha ka dhasha inta badan waa sida soo socota: PU pre-polymer; ② dhexdhexaad ah ka dib pre-polymer ku emulsified biyo si ay u sameeyaan kala firdhiso.
Hababka diyaarinta emulsion polyurethane waxay leeyihiin laba qaybood oo waaweyn: Habka emulsification dibadda iyo habka emulsification gudaha.
1. Habka emulsification-ka dibadda waa habka ku-meel-gaarka ah ee qasabka ah ee joogitaanka emulsifier, xiirid sare.
2. Habka is-emulsification waxaa lagu sameeyaa iyadoo la soo bandhigayo kooxaha hydrophilic qalfoofka molecular ee polyurethane.
Kooxaha Hydrophilic waxaa lagu soo dhex geliyaa qalfoofka molecular PU iyadoo la adeegsanayo silsilad balaadhinta monomers hydrophilic, kuwaas oo ka kooban kooxaha milixda sameeya iyo reagents-samaynta cusbada.
Polyurethane (PU) dib u warshadaynta caaga ah
- Polyurethane (PU) Dib-u-warshadaynta caaga ah waxa loo kala saari karaa dib u warshadayn jireed iyo kiimiko.Dib-u-warshadaynta jireed waxay siisay hab wax ku ool ah oo dhaqaale dib-u-warshadaynta ee xumbo adag ee polyurethane iyo isku-dhafka. Xajmiga alaabada xumbada poliurethane ee asalka ah ayaa marka hore la dhimay heer lagu hagaajin karo hababka labaad. Walxaha qashinka dib loo warshadeeyay, ama wax-ka-goynta hab-socodka wax-soo-saarka, ayaa hoos loo dhigay qaabab faa'iido leh sida flakes, granules ama budo.Dib-u-warshadaynta kiimikadu waa habka loo jebiyo xumbo polyurethane oo laga dhigo alaabta ceeriin ee polyurethane ama walxo kale oo kiimiko ah iyadoo la isticmaalayo alkolysis, amineysis, hydrolysis ama pyrolysis. Xumbada poliurethane waxay leedahay urethane iyo urea bonds. Habka alkolysis, aminolysis iyo alkali hydrolysis, urethane iyo urea bonds ee molecule polyurethane waa la jebiyey oo kala jajabay polyols, polyamines aromatic, carbon dioxide iyo wixii la mid ah.
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