Ua Kua Polyurethane: Txhaj Tshuaj Molded Ob-tivthaiv Polyurethane Thiab Lwm Yam Rau Tsev Casting, Txhaj Tshuaj Molding Khoom

2024 Tus sau: Beatrice Philips | [email protected]. Kawg hloov kho: 2024-01-18 12:13

Polyurethane yog suav tias yog cov khoom siv yav tom ntej. Nws cov yam ntxwv yog yam sib txawv uas lawv tuaj yeem hais tau tias tsis muaj qhov txwv. Nws ua haujlwm zoo ib yam nkaus hauv peb ib puag ncig uas paub thiab nyob hauv kab ciam teb thiab xwm txheej xwm txheej ceev. Cov khoom siv no tau xav tau zoo vim yog qhov tshwj xeeb ntawm kev tsim khoom, kev ua haujlwm zoo, nrog rau kev muaj.

Nws yog dab tsi?

Polyurethane (luv ua PU) yog cov polymer uas sawv tawm rau nws qhov kev ywj pheej thiab ua haujlwm ntev. Cov khoom siv polyurethane tau siv dav hauv kev lag luam vim muaj ntau yam khoom siv zog . Cov ntaub ntawv no tau maj mam hloov cov khoom siv roj hmab, vim tias lawv tuaj yeem siv tau rau hauv ib puag ncig kev txhoj puab heev, nrog rau cov khoom hnyav thiab muaj qhov kub thiab txias ua haujlwm dav, uas txawv ntawm -60 ° C txog + 110 ° C.

Ob-tivthaiv polyurethane (kua txhaj tshuaj yas) tsim nyog tau txais kev saib xyuas tshwj xeeb . Nws yog cov kab ke ntawm 2 yam zoo li cov khoom sib xyaw - cov kua ua kua thiab cov tawv tawv. Koj tsuas yog yuav tsum tau yuav 2 cov khoom sib xyaw thiab sib xyaw kom tau txais cov khoom ntim tau npaj txhij rau tsim cov ntawv matrices, stucco moldings thiab ntau ntxiv.

Cov khoom siv yog qhov xav tau zoo ntawm cov tuam txhab tsim khoom siv rau chav, hlau nplaum, cov duab thiab cov ntawv rau paving slabs.

Saib

Polyurethane muaj nyob hauv khw ntau yam:

kua

ua npuas ncauj (polystyrene, ua npuas roj hmab)

khoom (xws li pas nrig, daim hlau, ntawv, thiab lwm yam)

txau (polyuria, polyurea, polyurea)

Cov ntawv thov

Ob-tivthaiv txhaj tshuaj molding polyurethanes tau xyaum rau ntau yam kev siv, los ntawm kev siv lub zog los tsim cov hniav nyiaj hniav kub.

Cov cheeb tsam tseem ceeb tshwj xeeb ntawm kev siv rau cov khoom siv no yog raws li hauv qab no:

1. cov cuab yeej siv tub yees (txias thiab cua sov rwb thaiv tsev ntawm cov khoom siv tub yees txias thiab tub yees hauv tsev, lub tub yees, lub tsev rau khoom thiab chaw khaws khoom noj);
2. thauj cov khoom siv tub yees (txias thiab cua sov rwb thaiv tsev ntawm cov tub yees txias, tsheb tsheb isothermal);
3. kev tsim kho kom sai thiab txhim kho cov tsev thiab cov chaw tsim khoom (cov khoom cua sov rwb thaiv tsev thiab muaj peev xwm tiv taus qhov hnyav ntawm polyurethanes nruj hauv cov qauv ntawm cov vaj huam sib luag nyuaj nyuaj);
4. kev tsim kho thiab kho dua tshiab ntawm cov tsev nyob, tsev ntiag tug, tsev loj (rwb thaiv tsev ntawm cov phab ntsa sab nrauv, rwb thaiv tsev ntawm cov txheej txheem ru tsev, qhib qhov rai, qhov rooj, thiab lwm yam);
5. kev tsim vaj tsev pej xeem (rwb thaiv tsev sab nrauv thiab tiv thaiv lub ru tsev los ntawm ya raws los ntawm txoj kev siv tshuaj tsuag polyurethane nruj);
6. cov raj xa dej (cua sov rwb thaiv tsev ntawm cov raj xa dej, rwb thaiv tsev sov ntawm cov kav dej ntawm qhov kub thiab txias ib puag ncig ntawm cov tuam txhab tshuaj lom neeg los ntawm kev nchuav rau hauv qab lub thawv ntim ua ntej);
7. cov cua sov sib txuas ntawm cov nroog, cov zos thiab lwm yam (rwb thaiv tsev cua sov los ntawm kev siv cov kav dej polyurethane nruj thaum lub sijhawm teeb tsa tshiab lossis thaum kho dua tshiab siv ntau yam txuj ci thev naus laus zis: txau thiab nchuav);
8. hluav taws xob thiab xov tooj cua engineering (faib cov cua tsis kam mus rau ntau yam khoom siv hluav taws xob, tiv thaiv kev tiv thaiv dej nrog cov yam ntxwv zoo dielectric ntawm cov txheej txheem polyurethanes txhav);
9. kev lag luam tsheb (puab tsim sab hauv tsim ntawm lub tsheb raws li cov thermoplastic, ib nrab txhav, ywj, ib feem polyurethanes);
10. cov rooj tog tsim khoom (tsim cov rooj tog zaum hauv tsev siv cov roj hmab ua npuas dej (ua npuas dej polyurethane ua npuas ncauj), cov khoom zoo nkauj thiab lub cev ua los ntawm tawv tawv PU, kua roj vanish, txheej txheej, nplaum, thiab lwm yam);
11. textile kev lag luam (kev tsim cov leatherette, polyurethane ua npuas ncauj sib xyaw cov ntaub, thiab lwm yam);
12. kev lag luam aviation thiab kev tsim cov tsheb laij teb (cov khoom lag luam los ntawm kev hloov pauv polyurethane ua npuas nrog cov hluav taws kub tsis kam, ua los ntawm kev txhaj tshuaj, suab nrov thiab rwb thaiv tsev kub raws li hom tshwj xeeb ntawm PU);
13. tshuab tsim tsev lag luam (cov khoom lag luam los ntawm thermoplastic thiab tshwj xeeb hom ntawm polyurethane ua npuas ncauj).

Cov khoom ntawm 2-tivthaiv PU ua rau nws siv tau los tsim cov kua roj vanish, xim tsev, nplaum . Cov xim thiab cov kua roj vanish thiab cov nplaum tau ruaj khov rau qhov cuam tshuam rau huab cua, tuav nruj thiab ntev.

Cov kua ua kua 2-tivthaiv polyurethane kuj tseem xav tau kev tsim cov pwm rau kev nrum, piv txwv li, rau kev ua los ntawm cov qhob, polyester resins, siv quav ciab, gypsum, thiab ntxiv rau.

Polyurethanes kuj tseem siv hauv tshuaj - lawv tau siv los ua cov hniav cuav tshem tau . Ib qho ntxiv, koj tuaj yeem tsim txhua yam ntawm cov hniav nyiaj hniav kub los ntawm PU.

Txawm tias tus kheej kheej qib tuaj yeem ua los ntawm cov khoom siv no - xws li hauv pem teb yog qhov tshwj xeeb los ntawm kev hnav tsis kam thiab ntseeg tau.

Hauv qee thaj chaw, cov khoom tsim los ntawm PU yog qhov zoo tshaj hauv ntau tus yam ntxwv txawm tias yog hlau.

Nyob rau tib lub sijhawm, qhov yooj yim ntawm kev tsim cov khoom no ua rau nws muaj peev xwm los tsim ob qho khoom me me uas hnyav tsis ntau tshaj li ib gram thiab hnyav li ntawm 500 kg lossis ntau dua.

Hauv tag nrho, 4 cov lus qhia ntawm kev siv 2-tivthaiv PU sib xyaw tuaj yeem ua qhov txawv:

• cov khoom muaj zog thiab nruj, qhov twg PU hloov cov hlau thiab lwm yam hlau;
• cov khoom lag luam ywj pheej - siab yas ntawm polymers thiab lawv qhov yooj yim xav tau ntawm no;
• cov khoom tiv taus kev ua phem - kev ruaj ntseg siab ntawm PU rau cov tshuaj txhoj puab heev lossis cuam tshuam rau kev cuam tshuam;
• cov khoom uas nqus cov khoom siv dag zog los ntawm siab viscosity.

Qhov tseeb, kev qhia ua ke feem ntau siv, vim tias muaj cov khoom muaj txiaj ntsig xav tau los ntawm ntau cov khoom lag luam ib zaug.

Yuav siv li cas?

Polyurethane elastomer belongs rau qeb ntawm cov ntaub ntawv uas tuaj yeem ua tiav yam tsis muaj kev siv zog ntau. Polyurethanes tsis muaj qhov zoo ib yam, thiab qhov no tau siv ntau hauv ntau thaj chaw ntawm kev lag luam hauv tebchaws. Yog li, qee qhov teeb meem tuaj yeem ua tau ywj pheej, qhov thib ob - nruj thiab ib nrab nruj. Kev ua cov polyurethanes tau ua tiav siv cov txheej txheem no.

1. Extrusion - ib txoj hauv kev rau kev tsim cov khoom lag luam polymer, uas cov khoom yaj, uas tau txais qhov kev npaj tsim nyog, raug nias los ntawm cov cuab yeej tshwj xeeb - tshuab ntxhua khaub ncaws.
2. Casting - ntawm no cov yaj yaj tau txhaj rau hauv cov txheej txheem casting los ntawm kev siab thiab txias. Ua li no, polyurethane moldings tau ua.
3. Nias - thev naus laus zis rau kev tsim khoom ntawm cov yas thermosetting. Hauv qhov no, cov khoom siv tau hloov pauv mus rau hauv lub xeev ua kua. Tom qab ntawd qhov hnyav tau nchuav rau hauv cov pwm thiab los ntawm kev siv lub siab lawv ua rau nws tuab dua. Cov khoom no, thaum ua kom txias, maj mam tau txais cov yam ntxwv ntawm lub zog muaj zog, piv txwv li, lub nqaj polyurethane.
4. Txoj kev sau ntawm cov cuab yeej txheem.

Tsis tas li, polyurethane blanks tau ua haujlwm ntawm kev xa cov cuab yeej. Ib feem yog tsim los ntawm kev ua haujlwm ntawm kev sib hloov ua haujlwm nrog ntau yam txiav.

Los ntawm cov kev daws teeb meem no, nws muaj peev xwm tsim cov ntawv txhawb ntxiv, laminated, cov khoom ntxeem tau. Thiab qhov no yog ntau yam thaiv, tsim cov duab, yas zaj duab xis, phaj, fiber ntau thiab lwm yam. PU tuaj yeem yog lub hauv paus rau cov khoom lag luam xim thiab pob tshab.

Tsim cov polyurethane matrices ntawm koj tus kheej

Muaj zog thiab ywj pheej PU yog cov khoom siv nrov ntawm cov neeg ua haujlwm hauv zej zog, los ntawm cov qauv uas tau tsim los rau ntau yam khoom lag luam: cov pob zeb zoo nkauj, cov vuas pua pua, pob zeb paving, pob zeb ci thiab lwm yam khoom lag luam. Kev txhaj tshuaj molding PU yog cov khoom tseem ceeb vim nws cov yam ntxwv tshwj xeeb thiab muaj.

Qhov tshwj xeeb ntawm cov khoom siv

Kev tsim cov txheej txheem polyurethane hauv tsev cuam tshuam nrog kev siv kua 2-kev sib xyaw ua ke ntawm ntau hom, thiab PU twg los siv nyob ntawm lub hom phiaj ntawm kev pov:

• los tsim matrices rau cov khoom hnyav (piv txwv li, khoom ua si);
• los tsim cov pob zeb tiav, cov vuas;
• rau cov ntawv rau cov khoom hnyav hnyav.

Kev cob qhia

Ua ntej pib ua haujlwm, koj yuav tsum tau yuav polyurethane rau kev ua kom tiav daim ntawv kawm tiav. Cov txheej txheem ob-feem muag raug muag hauv 2 lub thoob thiab yuav tsum muaj kua thiab kua thaum qhib.

Koj kuj yuav tsum tau yuav:

• keeb kwm ntawm cov khoom lag luam los ntawm qhov uas yuav muab tso tawm;
• txiav MDF lossis laminated chipboard thiab tus kheej tapping screws rau kev ua haujlwm;
• tshwj xeeb lubricating anti-adhesive sib tov;
• lub taub ntim huv rau sib xyaw cov khoom xyaw;
• sib xyaw ua ke (hluav taws xob txuas txuas, tov khoom);
• silicone raws sealant.

Tom qab ntawd cov ntawv ua ke tau sib sau ua ke - ib lub npov nyob rau hauv cov duab ntawm lub duab plaub uas muaj qhov loj txaus kom haum raws li cov qauv xav tau.

Cov kab nrib pleb yuav tsum tau muab ntim nrog lub foob.

Ua daim ntawv

Thawj cov qauv raug tso rau hauv qab ntawm daim ntawv ua haujlwm ntawm qhov deb ntawm tsawg kawg 1 cm ntawm lawv tus kheej. Txhawm rau tiv thaiv cov qauv los ntawm kev plam, ua tib zoo kho lawv nrog lub foob. Ncaj nraim ua ntej casting, thav duab tau teeb tsa rau qib tsev.

Sab hauv, cov ntawv ua haujlwm thiab cov qauv tau npog nrog cov tshuaj tiv thaiv sib xyaw, thiab thaum nws nqus tau, cov khoom ua haujlwm tau ua. Cov khoom sib xyaw tau nchuav rau hauv lub khob huv hauv qhov xav tau sib piv (raws li cov khoom siv nyiam) thiab sib tov sib xyaw kom txog thaum muaj cov homogeneous loj.

Txhawm rau tsim cov pwm, polyurethane tau nchuav ua tib zoo tso rau hauv ib qho, tso cai rau cov khoom kom tshem tawm huab cua ntau dhau los ntawm nws tus kheej . Cov qauv yuav tsum tau npog nrog cov polymerization loj los ntawm 2-2.5 centimeters.

Tom qab 24 teev, cov khoom tiav raug tshem tawm thiab siv rau lawv lub hom phiaj.