Polyamide yog ib qho luv luv rau polyurethane, thiab yog cov khoom siv polymer uas muaj ntau qhov kev rov ua dua cov amino pawg hauv cov saw hlau tseem ceeb, thiab tau txais los ntawm cov tshuaj tiv thaiv ib qho isocyanate nrog polyol compound. Polyurethane rau ib leeg yog microporous elastomer ntawm roj hmab thiab yas. Nws yog microporous elastic qauv nrog qhib pores. Txoj kab uas hla ntawm lub hlwb yog {{0}}.01-0.1mm, thiab qhov dawb foaming ceev yog 0.25~0.35. (Forming ntom ntom 0.3-1) Nws feem ntau muaj 1-2mm tus kheej-skinning thiab muaj zoo resilience thiab zoo heev zog nqus.
Ua ntej, polyurethane yog cov khoom siv zoo tshaj plaws rau kev tsim cov khau khiab
1. Polyurethane ib leeg muaj cov yam ntxwv ntawm softness, warmth, roj kuj, flexing kuj thiab hnav tsis kam. Nws yog 6 npaug ntau hnav-resistant dua li roj hmab. Nws tuaj yeem kho nws qhov ntom thiab hardness nyob rau hauv ntau yam raws li qhov yuav tsum tau siv. Nws tuaj yeem ua rau ob xim (ob chav ntom ntom). Ob chav hauv qab ntawm ib leeg yog micro-foamed, hnav-resistant ua hauj lwm nto, thiab sab hauv ib leeg yog ib qho yooj yim ua npuas ncauj uas nyiam hnav.
2, lub teeb heev, lub ntiajteb txawj nqus tsuas yog 0 xwb. 15% ntawm lub ntiaj teb no cov khau tiv thaiv kev nyab xeeb (cov khau ua haujlwm) siv polyurethane (PU) ib leeg.
3, cov pwm yuav tsum tau qis dua, cov khoom tsim tau yooj yim rau kev nqis peev thiab txuag tau (cov npuas siab me me thaum foaming, tsuas yog 0.14-0.2Mpa).
4, txoj kev molding yog qhov yooj yim thiab ua tau, tsis tuaj yeem tsim cov khau nkaus xwb, tab sis kuj tseem tsim cov khau, (PU puag thiab ntau yam ntaub ntawv muaj zog adhesion) ntau yam thiab hloov pauv hloov pauv, haum rau niaj hnub kev lag luam.
Qhov thib ob, cov txheej txheem ntau lawm
1. Kev npaj ntawm PU ib qho khoom lag luam tov
Cov khoom lag luam tuaj yeem muab faib ua ob hom: hom polyester thiab hom polyether. Thaum ntxov xyoo, cov txheej txheem polypropylene glycol tau tsim, thiab feem ntau yog cov tshuab polyester. Cov txheej txheem kev npaj yog txawv vim lawv cov khoom sib txawv.
Polyester PU ib leeg npaj npaj feem ntau yog npaj los ntawm txoj kev prepolymer los yog semi-prepolymer txoj kev. Feem ntau, nws tuaj yeem ua rau ob lub ntsiab lus lossis peb lub ntsiab lus. Ntu A muaj ib nrab polyester, saw extender, ua npuas ncauj stabilizer thiab plaub hau. Soaking tus neeg saib xyuas thiab lwm yam khoom, 40e ~ 70e sib xyaw thiab zoo li qub degassing muab tau los. Nyob rau hauv tag nrho cov-dej foaming system, tus neeg sawv cev foaming yog dej, thiab tus nqi ntawm cov dej nyob rau hauv lub Cheebtsam A yuav tsum tau txiav txim, thiab cov ntsiab lus ntawm no feem ntau yog hais txog 0.4%. B tivthaiv yog lub davhlau ya nyob twg isocyanate prepolymer tau los ntawm reacting ib feem ntawm polyester polyol nrog ib qho isocyanate. Cov txheeb ze molecular loj ntawm polyester yog nyiam dua 1500 ~ 2000. Hauv isocyanate, qhov piv ntawm cov ntshiab MDI rau liquefied MDI yog 19B1. Thaum lub sij hawm cov tshuaj tiv thaiv, ib feem kaum ntawm cov inhibitor yuav tsum tau ntxiv los mus cuam tshuam qhov tshwm sim ntawm sab tshwm sim. Nws tuaj yeem khaws cia ntawm qhov kub thiab txias rau 2h ~ 3h, thiab NCO% yog tswj ntawm li 19%. C tivthaiv yog ib qho catalyst (ib qho khoom siv ob qho khoom siv tau ntxiv rau A tivthaiv). Cov txheej txheem peb-txheej txheem yog tsim rau ob-xim, qis-hardness khau kis las thiab khau khiab qis. Thaum siv, cov khoom siv A thiab C tivthaiv sib xyaw ua ke, thiab tom qab ntawd sib xyaw nrog B tivthaiv. Nws yog tus cwj pwm los ntawm qhov tsis tshua muaj viscosity thiab reactivity txo, me me hardness thiab dimensional hloov ntawm cov khoom thiab zoo molding stability. Kev npaj ntawm polyether hom kua kua yog feem ntau nqa tawm los ntawm ib tug-kauj ruam txoj kev. Cov tshuaj tivthaiv A yog tau los ntawm kev sib xyaw ua ke ntawm polyether polyol, cov saw txuas ntxiv, tus neeg sawv cev foaming, catalyst thiab ua npuas ncauj stabilizer hauv lub tov khoom; Cov tshuaj tivthaiv B yog hloov kho isocyanate lossis MDI liquefied. Polyester diol tuaj yeem cuam tshuam lub zog siab, hnav tsis kam thiab muaj zog adhesion rau sab sauv ntawm ib leeg. Polyether ib leeg kov yeej qhov tsis zoo ntawm cov dej tsis zoo thiab tsis muaj qhov kub thiab txias elasticity ntawm polyester ib leeg, thiab moldability zoo. Zoo heev tsis tshua muaj kub yooj thiab elasticity thaum tuav lub cev thiab txhua yam khoom ntawm ib leeg. Txawm li cas los xij, nyob rau hauv cov xwm txheej tsawg, cov polyester ib leeg muaj qhov tsis zoo ntawm qhov ruaj khov, thaum lub polyether ib leeg muaj qhov zoo ntawm qhov ruaj khov ntawm tib qhov ntom, tab sis muaj cov khoom siv tsis zoo, yog li hauv cov dej-ua npuas dej, nws tuaj yeem ntsuas tau. Ib txoj hauv kev sib tov ob qho cawv los txhim kho lub zog txhua yam thiab hnav tsis kam ntawm tsab xov xwm. Cov hauj lwm no tau tshaj tawm nyob rau txawv teb chaws. Piv txwv li, poly (ether 2 ester) polyol ntawm Mipolur PE2 Polidol A [2] yog ib qho sib xyaw polyol uas muaj ob qho tib si ether thiab ester, thiab kev ua tau zoo ntawm cov khoom siv ib leeg yog nruab nrab ntawm hom polyester thiab polyether hom. Cov kws tshawb fawb hauv tsev kuj tau ua qee yam haujlwm los kuaj Liu Sheng thiab lwm yam khoom siv hauv tsev ua cov khoom siv tseem ceeb los muab cov yam ntxwv ntawm polyester polyol los txhim kho, ua ke poly (ester 2 ether) ua npuas ncauj ib leeg cov khoom, uas muaj lub cev zoo thiab cov khoom siv kho tshuab. Raws li GB10508289 Performance index, tus nqi yog 10% ~ 15% qis dua li cov khoom siv polyester ntshiab PU [3].
2, PU ib leeg molding txheej txheem
Lub PU ib leeg muaj ib lub hauv paus, ib lub hnab ntim polyurethane khau raj, ib qho ncaj qha insolation ntawm sab sauv, ib qho nyuaj thiab ib nrab txheej ntawm ib leeg, thiab molding ntawm tag nrho cov khau thiab ib leeg ua ke. Ib leeg, sab sauv lossis sab saud ntawm tag nrho cov-polyurethane khau boots yog ua los ntawm PU. Cov khau tag nrho-polyurethane ua los ntawm micro-porous PU elastic, khau boots yog mos, cov khau looj plab yog hnav-resistant, roj thiab tshuaj resistant, thiab tag nrho cov khau yog lub teeb thiab sov. Kev sib deev thiab kev nplij siab. PU cov khau feem ntau yog tsim los ntawm qhov tsis tshua muaj siab casting lossis siab siab casting, thiab ob peb kuj yog txhaj molded. Cov txheej txheem ntws tau qhia hauv daim duab 1. Cov khoom siv molding yog ib lub tshuab casting. Lub atmospheric siab pouring khoom rau polyester PU molding yog tsim los ntawm lub tshuab casting, ib lub nplhaib los yog lub turntable ziab qhov. Nyob rau hauv PU ib qho kev daws teeb meem, txij li cov khoom A thiab B yog cov kua thiab cov tshuaj tiv thaiv sib xyaw yog qhov hnyav, qhov tseeb metering ntawm cov cuab yeej thiab qhov sib xws ntawm kev sib xyaw ntawm cov khoom siv thaum lub sij hawm molding txheej txheem yog ob qho tseem ceeb cuam tshuam ncaj qha rau kev ua haujlwm ntawm cov khoom. cov khoom. Rau ob-xim ib leeg, nws yog molded los ntawm ob-xim casting tshuab, feem ntau siv cov pwm nrog ib tug nruab nrab phaj, thiab yog raug rau theem nrab casting thiab kub curing.
Thib peb, cov xwm txheej rau kev tsim cov PU soles
1. Ntau qhov chaw: 8m dav, 20m ntev, txog 160m2, cov khoom siv raw khoom, cov khoom tiav thiab cov khoom tiav warehouse. Vim tias cov khoom siv sib zog thiab qhov chaw loj hauv pem teb, nws tuaj yeem muab tso rau hauv pem teb sab saud (rau kev teeb tsa thiab kev txav, cov khoom siv tsis muaj av). Yog tias PU ib leeg yuav tsum tau tsim, yuav tsum muaj qhov chaw pleev xim; yog tias cov khau raug tsim, cov khoom siv thiab qhov chaw rau sewing lub sab sauv thiab shaping yuav tsum tau ntxiv.
2. Cov khoom siv: Cov khoom siv raw yuav tsum khaws cia ntawm 0.5-1 tons, A cov khoom yog 18kg ib chim, thiab B khoom yog 20kg ib chim. Txawm hais tias cov khoom siv C tsawg heev, nws tuaj yeem npaj tau txog li 10kg vim tias nws tsis yooj yim rau deteriorate. Tsis tas li ntawd, nws yog ib qho tsim nyog los npaj 50 kg ntawm kev tso tawm tus neeg sawv cev, ib lub thoob loj ntawm tus neeg saib xyuas (methylene chloride) thiab ntau cov xim pastes. (Cov ntawv sau los ntawm Ntiaj Teb Polyurethane Network)
3, lub zog yog li 50kw, yog tias cov kab ntau lawm qhov cub tsis xav tau hluav taws xob cua sov, lub zog xav tau txog 20kw.
4. Lub tshuab cua compressor 壹 lub tes tsho (gas ntim 0.6m3/min, cua siab 0.6~0.8MPa, lub zog 5.5kw) yog siv los ua lub ntsiab cua thiab tshuaj tsuag tso tawm tus neeg sawv cev.