Tag nrho cov polyurethane hu ua polyurethane, yog collectively rov urethane pawg (NHCOO) macromolecular compound muaj nyob rau hauv lub ntsiab saw. Nws yog tsim los ntawm ib tug organic diisocyanate los yog polyisocyanate compound nrog ob los yog ntau tshaj hydroxyl polyaddition. Cov nram qab no cov tshuaj tiv thaiv mis: -N = C = O + HO- → -NH-COO-, nyob rau hauv tas li ntawd mus rau lub polyurethane macromolecule carbamate, kuj muaj ether, ester, urea, biuret, allophanate, thiab lwm yam pab pawg.
(Cyanate
Description: HOC≡N (n) cyanate HN = C = O (isocyanate) muaj ib tug (zoo) cyanate thiab isocyanate ob hom. Cov dawb acid yog ib tug sib tov ntawm ob leeg, tsis sib cais qhib, tab sis nws esters yog ob cov ntaub ntawv. Cyanate yog volatile thiab corrosive kua. Muaj yog ib tug muaj zog tsis hnov tsw ntawm acetic acid. Ceev 1.14. Boiling point 23,6 ℃. Qhia zog acidity nyob rau hauv aqueous tov. Tsis ruaj tsis khov, yooj yim polymerization. Ammonia thiab carbon dioxide generated thaum lub sij hawm hydrolysis. Thaum generating carbamates thiab alcohols lub luag hauj lwm. (N) isocyanate ROC≡N yooj yim polymerization, thiab raug rau hydrolysis, twb tau nyob hauv cov ntshiab daim ntawv yooj yim. Isocyanate RN = C = O los yog O = C = NRN = C = O, feem ntau unpleasant tsw nrog ib tug kua. Cyanate cyanuric acid yuav tsum npaj kom txhij los ntawm thermal decomposition. )
Polyurethane khoom tsim mos mos, semi-yeem thiab txhav foams, elastomers, xim, adhesives, sealants, hluavtaws tawv txheej resins, Elastomeric fibers, dav siv nyob rau hauv lub tsheb manufacturing, tub yees manufacturing, tsheb thauj mus los, civil engineering kev tsim kho, khau, hluavtaws tawv, textile, machinery, petrochemical, tsuas machinery, aerospace, kev kho mob, ua liaj ua teb thiab ntau lwm teb.
Nyob ntawm seb qhov sib txawv raw cov ntaub ntawv, yuav muaj ntau hom ntawm cov khoom, feem ntau ob hom ntawm polyester thiab polyether. Polyether polyurethane yog mas polyurethane khoom npaj txhais rau polyol, ib tug polyurethane polyol uas yog npaj nkaus los ntawm polyether polyol los yog ib feem ntau ntawm muaj nyob rau hauv lub system.
Polyether polyols nyob rau hauv lub molecular qauv, ib tug ether daim ntawv cog lus cohesive zog yog tsawg tsawg, thiab yooj yim rau tig, ces nws yog ib tug zoo uas tsis muaj-kub polyurethane khoom npaj los ntawm nws cov supple ua tau zoo, zoo heev hydrolysis kuj, tab sis tsis yog raws li zoo raws li tus neeg kho tshuab thaj chaw ntawm polyester polyurethane, tab sis tsis tshua muaj viscosity cov ntaub ntawv, ib qho yooj yim thiab isocyanate tivthaiv miscible additives, zoo heev ua tau zoo.
Polyester polyols yog feem ntau xa mus rau los ntawm ib tug dicarboxylic acid nrog ib tug glycol thiab lwm yam polyester polyol los ntawm hws cov tshuaj tiv thaiv. Benefit muaj ester pab pawg neeg (hais nkwg) los yog ib tug carbonate pab pawg neeg (OCOO) polyol. Polyurethane foams yog dav siv nyob. Mos ua npuas ncauj yog tsuas yog siv rau cov rooj tog thiab tsheb ntawm ntau yam lev cov ntaub ntawv, rwb thaiv tsev ntaub ntawv; txhav ua npuas ncauj rwb thaiv tsev yog tsuas yog siv rau tsev neeg cov khoom siv, vaj tse nyob phab ntsa waterproofing tsuag ua npuas ncauj rwb thaiv tsev, cov yeeb nkab rwb thaiv tsev cov ntaub ntawv, lub tsev panels, Tub yees cov tsheb thauj khoom thiab txias cia rwb thaiv tsev thiab lwm yam ntaub ntawv; semi-txhav ua npuas ncauj siv nyob rau hauv tsheb ntsuas panels, kauj log thiab hais txog. Lub lag luam muaj ib tug ntau yam ntawm specifications rau polyurethane ua npuas ncauj ke ntawm cov ntaub ntawv (ob-tivthaiv premix), mas rau lub (txias kho) siab resilience foams, semi-txhav foams, casting thiab txau nyuaj ua npuas ncauj yas.
(Diethyl ether
1. Thaum ib tug sib tov ntawm ethanol thiab concentrated sulfuric acid twb rhuab mus 140 ℃ yuav intermolecular lub cev qhuav dej cov khoom uas muaj ether. Concentrated sulfuric acid raws li ib tug dehydrating neeg sawv cev qhov chaw uas tus catalyst.
2. kab zauv: 2 CH3-CH2-OH - tshwmsim thiab feeb meej H2SO4 → ntawm 140 ℃ CH3-CH2-O-CH2-CH3 + H2O)
Polyurethane elastomer
Polyurethane elastomer yog ib tug polyurethane puas khoom siv ntawm ib tug ntau yam, vim hais tias ntawm nws cov qauv nrog mos mos thiab nyuaj ob theem, yuav tsum tau tsim rau impart molecular khoom muaj ib tug siab zog, toughness, hnav kuj, roj kuj, zoo heev zoo, ob leeg nrog roj hmab muaj siab elasticity thiab rigidity ntawm yas, hu ua "hnav-resistant roj hmab."
Polyurethane elastomer tau tam sim no siv tib lub general roj hmab mastication, nws, tua molding txheej txheem (xa MPU); kuj yuav ua los ntawm cov kua roj hmab, ntiab molding los yog txau, casting, centrifugal molding (xa mus rau CPU); kuj yuav npaj mus rau hauv pellets, thiab, zoo li zoo tib yam yas, txhaj tshuaj, extrusion, calendering, tshuab molding thiab lwm yam dab (ntawm CPU). Moulding los yog txhaj molded qhov chaw, nyob rau hauv ib yam ntau yam ntawm hardness, tab sis kuj muaj peev xwm yuav txiav, sib tsoo, drilling thiab lwm yam machining. Ua ntawm ntau haiv neeg, cov polyurethane elastomer dav heev applicability, daim ntaub ntawv txuas ntxiv mus rau loj hlob.
Roj kuj, ozone kuj, laus kuj, tawg kuj, tsis muaj kub, pob tshab suab zoo, muaj zog adhesion, yav tom ntej biocompatibility thiab cov ntshav compatibility. Cov zoo yog cov polyurethane elastomer lug siv nyob rau hauv cov tub rog, aerospace, acoustics, ib thiab lwm yam yog vim li cas.
Lub ntsiab kom zoo dua ntawm polyurethane elastomer:
1, qhov kev kawm ntawm cov adjustable ntau yam. Ib tug xov tooj ntawm lub cev thiab cov neeg kho tshuab kawm ntawv yuav tau tom los ntawm kev xaiv ntawm raw cov ntaub ntawv thiab formulations, nyob rau hauv ib yam ntau yam, kom tau raws li qhov sib txawv uas yuav tsum tau rau cov khoom ua tau zoo. Xws li hardness, yog feem ntau ib qho tseem ceeb qhia ntawm cov khoom tus neeg siv, ob leeg ua los ntawm polyurethane elastomer Ntug dej A hardness ntawm 20 los yog li mos mos printing chais, tab sis kuj ua tau ntau tshaj 70 Ntug dej D hardness ntawm hard roj hmab cov menyuam dov, qhov no yog ib tug general Elastomeric cov ntaub ntawv uas yooj yim ua. Polyurethane elastomer yog ib tug ncov qaumteb qabteb polymer khoom tsim los ntawm cov ntau theem thiab nyuaj theem muaj li ntawm saj zawg zog saw, nrog rau kev txhim kho thiab kev nce ntawm cov ncov qaumteb qabteb pab pawg neeg density nyuaj ya kev faib ua feem ntawm elastomer thawj lub dag lub zog thiab hardness yuav tau nce raws li.
2, superior coj kuj. Tshwj xeeb qhov chaw uas muaj dej, roj ntxoov nruab nrab uas twb muaj lawm ua hauj lwm tej yam kev mob, lub coj kuj yog feem ntau ob peb lub sij hawm mus rau ob peb lub sij hawm lub dog dig roj hmab cov ntaub ntawv. Nws yog xim hlau ntaub ntawv xws li steel, txawm hais tias nyuaj heev, tiam sis tsis tas hnav, xws li loj twj tso kua mis irrigation cheeb tsam ntawm lub daj dej, lub overcurrent tiv thaiv Cheebtsam thiab hlau qhov ncauj nplhaib nplhaib tom qab ib tug ntau ntawm cov txo yaig, tsis noj pua pua ntawm cov sij hawm mus rau mob hnyav hnav to, thaum lub sij hawm siv polyurethane elastomer coated lub qhov ncauj nplhaib thiab ntiv nplhaib kev tiv thaiv yog lub lag luam nruam 1800 mus rau hauv ib tug me me tsis tau hnav. Lwm tus, xws li mov milling siv roj hmab cov menyuam hulling tshuab, vibrating sab cib screen Thee npaj thiab khiav lub chaw ntau pob tso mam li pawv, dynamic roj cov ntsaws ruaj ruaj siv forklift crane elevator log thiab log menyuam skates, tej yam li ntawd yog tseem polyurethane elastomer Nws los nyob rau hauv. Nyob rau hauv no siv taw tes yog yuav tsum tau los txhim kho lub coefficient ntawm tsis sib haum xeeb ntawm cov uas tsis muaj-hardness polyurethane elastomer neeg, los txhim kho hnav kuj nyob rau hauv load tau cov kabmob, koj muaj peev xwm ntxiv ib tug me me npaum li cas ntawm txhuas disulfide, graphite los yog silicone cov roj nyob rau hauv xws li ib tug polyurethane elastomer, thiab lwm yam roj nplua nyeem.
Post lub sij hawm: Nov-24-2018