MaAmines mukugadzirwa kwePolyurethane uye Basa reCatalysts

Polyurethane ipolymer inoshandiswa zvakasiyana-siyana mukushandiswa kwakasiyana-siyana, kubva pamafuro nependi kusvika kuma elastomers neadhesives. Kugadzirwa kwepolyurethane kunosanganisira maitiro akaomarara emakemikari pakati pema polyol ne isocyanates, uye ma catalysts anoita basa rakakosha mukufambisa maitiro aya zvinobudirira. Pakati pemhando dzakasiyana dze catalysts dzinoshandiswa, ma catalysts akavakirwa pa amine anonyanya kukosha nekuda kwekukwanisa kwawo kukurumidzisa maitiro uye kudzora hunhu hwechigadzirwa chekupedzisira.

MaAmines mukugadzirwa kwePolyurethane

MaAmines imakemikari eorganic anobva kuammonia uye anozivikanwa nekuvapo kweboka rimwe kana akawanda ealkyl kana aryl akabatana neatomu renitrogen. Panyaya yekugadzira polyurethane, maamine catalysts anoshandiswa kubatsira zvese reaction yeurethane (polyol neisocyanate) uye urea (mvura neisocyanate). Macatalysts aya anogona kupatsanurwa zvakanyanya mu tertiary amines uye amine-based polyols.

1. MaAmine eTertiary: Aya ndiwo maamine catalysts anonyanya kushandiswa mu polyurethane formulations. Mienzaniso inosanganisira triethylenediamine (TEDA), dimethylcyclohexylamine (DMCHA), uye bis(dimethylaminoethyl) ether (BDMAEE). Makemikari aya anowedzera reaction rates, anovandudza kuumbwa kwefuro, uye anopesvedzera chimiro chemasero emafuro e polyurethane.

2. MaPolyol Akavakirwa paAmine: Aya maPolyol anoshanda seamine anoshanda sepolyol uye secatalyst. Anonyanya kubatsira mukugadzira masisitimu efoam anochinjika uko kunodiwa kuti reactivity iwedzere.

 Chinogadzirisa

, kana kuti 1,4-diazabicyclo[2.2.2]octane, chinhu chinozivikanwa zvikuru che tertiary amine catalyst muindasitiri ye polyurethane. Inoshanda zvikuru mukukurudzira maitiro e gelling (urethane formation) uye blowing (carbon dioxide formation). Maumbirwo akasiyana e carbon dioxide anoibvumira kukurudzira maitiro akaenzana, ichivimbisa hunhu hwakanaka hwefuro senge density, saizi yemasero, uye simba remuchina.

15uye T

1. 15: Iyi i catalyst inoshanda zvikuru inobva kuamine yakagadzirirwa kushandiswa mukushandiswa kwe polyurethane foam. Inopa basa rakanaka kwazvo re catalytic, ichikurudzira kukurumidza kuita reaction uye kuvandudzwa kwehunhu hwe foam. 15 inonyanya kushanda mumaitiro e foam anochinjika uye akaomarara, ichipa hunhu hwakavandudzwa hwekugadzirisa uye kushanda kwepamusoro kwekugadzirwa kwekupedzisira.

2. T: Iyi catalyst ndeimwe mhando yemhuri, yakagadzirirwa kushandiswa kwepolyurethane. T inozivikanwa nekushanda kwayo kwakasimba kwe catalytic uye kugona kwayo kupa mashandiro akasimba uye akavimbika mumhando dzakasiyana dze foam. Inoshandiswa zvakanyanya muhurongwa hwe foam hunochinjika uye hwakasimba, zvichipa kutonga kwakawedzerwa pamusoro pehunhu hwe foam.

 Mhedziso

MaAmine, kunyanya maamine echitatu akadai se , anoita basa rakakosha mukugadzirwa kwepolyurethane. MaCatalysts akadai se15 neT akakosha pakuzadzisa mwero wekuita zvinodiwa uye hunhu hwefuro, zvichivimbisa zvigadzirwa zvepolyurethane zvemhando yepamusoro. Nekunzwisisa nekushandisa maCatalysts aya zvinobudirira, vagadziri vanogona kugadzirisa maitiro avo ekugadzira uye kuwedzera mashandiro ekushandisa kwavo polyurethane.