Kev npaj thiab cov yam ntxwv ntawm polyurethane semi-rigid ua npuas ncauj rau kev ua haujlwm siab automotive handrails.
Lub rooj zaum hauv lub tsheb yog ib feem tseem ceeb ntawm lub cab, uas ua lub luag haujlwm ntawm kev thawb thiab rub lub qhov rooj thiab muab tus neeg txhais tes tso rau hauv lub tsheb. Thaum muaj xwm txheej ceev, thaum lub tsheb thiab lub tes tuav sib tsoo, polyurethane mos tes tuav thiab hloov kho PP (polypropylene), ABS (polyacrylonitrile - butadiene - styrene) thiab lwm yam yas tuav, tuaj yeem muab kev ywj pheej zoo thiab buffer, yog li txo qhov raug mob. Polyurethane mos ua npuas ncauj tes tuav tuaj yeem muab kev xav zoo tes thiab qhov zoo nkauj ntawm qhov chaw, yog li txhim kho kev nplij siab thiab kev zoo nkauj ntawm lub cockpit. Yog li ntawd, nrog rau kev txhim kho ntawm kev lag luam tsheb thiab kev txhim kho ntawm cov neeg xav tau rau cov ntaub ntawv sab hauv, qhov zoo ntawm polyurethane mos ua npuas ncauj hauv tsheb tuav tau dhau los ua qhov pom tseeb ntau dua.
Muaj peb hom polyurethane mos tes tuav: ua npuas dej siab, ua npuas dej nws tus kheej thiab ua npuas dej semi-rigid. Sab nraud ntawm cov tes tuav siab yog npog nrog PVC (polyvinyl chloride) tawv nqaij, thiab sab hauv yog polyurethane ua npuas dej siab. Kev txhawb nqa ntawm cov ua npuas dej tsis muaj zog, lub zog tsis tshua muaj, thiab qhov sib txuas ntawm cov ua npuas dej thiab daim tawv nqaij tsis txaus. Cov tes tuav nws tus kheej muaj txheej tawv nqaij ua npuas dej, pheej yig, qib kev sib koom ua ke siab, thiab siv dav hauv cov tsheb lag luam, tab sis nws nyuaj rau xav txog lub zog ntawm qhov chaw thiab kev nplij siab tag nrho. Semi-rigid armrest yog npog nrog PVC tawv nqaij, daim tawv nqaij muab kev kov zoo thiab tsos, thiab sab hauv semi-rigid ua npuas dej muaj kev xav zoo heev, tiv taus kev cuam tshuam, nqus hluav taws xob thiab tiv taus kev laus, yog li nws tau siv dav dua hauv kev siv sab hauv tsheb neeg caij tsheb.
Hauv tsab ntawv no, cov mis yooj yim ntawm polyurethane semi-rigid ua npuas ncauj rau cov tsheb tuav tes tau tsim, thiab nws txoj kev txhim kho tau kawm ntawm qhov no.
Tshooj sim
Cov khoom siv tseem ceeb
Polyether polyol A (hydroxyl tus nqi 30 ~ 40 mg/g), polymer polyol B (hydroxyl tus nqi 25 ~ 30 mg/g): Wanhua Chemical Group Co., LTD. Hloov kho MDI [diphenylmethane diisocyanate, w (NCO) yog 25% ~ 30%], composite catalyst, wetting dispersant (Agent 3), antioxidant A: Wanhua Chemical (Beijing) Co., LTD., Maitou, thiab lwm yam.; Wetting dispersant (Agent 1), wetting dispersant (Agent 2): Byke Chemical. Cov ntaub ntawv raw saum toj no yog qib kev lag luam. PVC daim tawv nqaij: Changshu Ruihua.
Cov khoom siv tseem ceeb thiab cov cuab yeej siv
Sdf-400 hom tshuab sib tov ceev ceev, AR3202CN hom hluav taws xob sib npaug, pwm txhuas (10cm × 10cm × 1cm, 10cm × 10cm × 5cm), 101-4AB hom hluav taws xob blower qhov cub, KJ-1065 hom hluav taws xob universal tension tshuab, 501A hom super thermostat.
Kev npaj cov mis mos thiab cov qauv yooj yim
Cov qauv yooj yim ntawm cov ua npuas ncauj polyurethane semi-rigid tau qhia nyob rau hauv Rooj 1.
Kev npaj cov qauv kuaj cov khoom siv kho tshuab: cov khoom sib xyaw ua ke (A khoom) tau npaj raws li cov qauv tsim, sib xyaw nrog MDI hloov kho hauv qee qhov sib piv, do nrog lub cuab yeej nplawm ceev ceev (3000r / min) rau 3 ~ 5s, tom qab ntawd nchuav rau hauv cov pwm sib xws kom ua npuas ncauj, thiab qhib cov pwm hauv ib lub sijhawm kom tau txais cov qauv polyurethane ua npuas ncauj semi-rigid.
Kev npaj cov qauv rau kev sim kev ua haujlwm sib txuas: ib txheej ntawm daim tawv nqaij PVC raug muab tso rau hauv qhov tuag qis dua ntawm cov pwm, thiab cov polyether sib xyaw ua ke thiab MDI hloov kho tau sib xyaw ua ke, do los ntawm lub cuab yeej nplawm ceev ceev (3 000 r / min) rau 3 ~ 5 s, tom qab ntawd nchuav rau hauv qhov chaw ntawm daim tawv nqaij, thiab cov pwm raug kaw, thiab cov ua npuas ncauj polyurethane nrog daim tawv nqaij raug pwm hauv ib lub sijhawm.
Kev xeem ua tau zoo
Cov khoom siv kho tshuab: 40% CLD (compressive hardness) raws li ISO-3386 tus qauv xeem; Lub zog tensile thiab elongation thaum tawg raug sim raws li ISO-1798 tus qauv; Lub zog tsim kua muag raug sim raws li ISO-8067 tus qauv. Kev ua tau zoo ntawm kev sib txuas: Lub tshuab hluav taws xob universal tension siv los tev tawv nqaij thiab ua npuas dej 180 ° raws li tus qauv ntawm OEM.
Kev ua haujlwm laus: Sim qhov poob ntawm cov khoom siv kho tshuab thiab cov khoom sib txuas tom qab 24 teev ntawm kev laus ntawm 120 ℃ raws li tus qauv kub ntawm OEM.
Cov txiaj ntsig thiab kev sib tham
Khoom siv kho tshuab
Los ntawm kev hloov pauv qhov piv ntawm polyether polyol A thiab polymer polyol B hauv cov mis yooj yim, qhov cuam tshuam ntawm cov tshuaj polyether sib txawv ntawm cov khoom siv kho tshuab ntawm cov ua npuas polyurethane semi-rigid tau tshawb nrhiav, raws li qhia hauv Rooj 2.
Los ntawm cov txiaj ntsig hauv Rooj 2, peb pom tau tias qhov piv ntawm polyether polyol A rau polymer polyol B muaj feem cuam tshuam rau cov khoom siv kho tshuab ntawm polyurethane ua npuas ncauj. Thaum qhov piv ntawm polyether polyol A rau polymer polyol B nce ntxiv, qhov ntev ntawm qhov tawg nce ntxiv, qhov nyuaj ntawm compressive txo qis rau qee qhov, thiab lub zog tensile thiab lub zog tearing hloov me ntsis. Cov saw molecular ntawm polyurethane feem ntau muaj cov ntu mos thiab ntu nyuaj, ntu mos los ntawm polyol thiab ntu nyuaj los ntawm carbamate bond. Ntawm ib sab tes, qhov hnyav molecular thiab tus nqi hydroxyl ntawm ob polyols sib txawv, ntawm qhov tod tes, polymer polyol B yog polyether polyol hloov kho los ntawm acrylonitrile thiab styrene, thiab qhov rigidity ntawm cov saw saw tau txhim kho vim muaj benzene ring, thaum polymer polyol B muaj cov khoom me me molecular, uas ua rau brittleness ntawm cov npuas ncauj. Thaum polyether polyol A yog 80 qhov thiab polymer polyol B yog 10 qhov, cov khoom siv kho tshuab ntawm cov npuas ncauj zoo dua.
Cov khoom sib txuas
Ua ib yam khoom uas muaj kev nias siab heev, lub tes tuav yuav txo qhov kev nplij siab ntawm cov khoom yog tias ua npuas ncauj thiab daim tawv nqaij tev tawm, yog li qhov kev ua tau zoo ntawm polyurethane ua npuas ncauj thiab daim tawv nqaij yog qhov yuav tsum tau ua. Raws li kev tshawb fawb saum toj no, cov tshuaj sib txawv ntawm cov khoom sib xyaw tau ntxiv los sim cov khoom sib txuas ntawm cov ua npuas ncauj thiab daim tawv nqaij. Cov txiaj ntsig tau qhia hauv Rooj 3.
Los ntawm Rooj 3, koj pom tau tias cov tshuaj sib txawv uas ua rau cov khoom ntub dej sib txawv muaj cov teebmeem pom tseeb rau lub zog tev ntawm cov ua npuas thiab daim tawv nqaij: Cov ua npuas dej tawg tom qab siv cov tshuaj ntxiv 2, uas tej zaum yuav yog vim qhib ntau dhau ntawm cov ua npuas tom qab ntxiv cov tshuaj ntxiv 2; Tom qab siv cov tshuaj ntxiv 1 thiab 3, lub zog stripping ntawm cov qauv dawb paug muaj qee qhov nce ntxiv, thiab lub zog stripping ntawm cov tshuaj ntxiv 1 yog li 17% siab dua li ntawm cov qauv dawb paug, thiab lub zog stripping ntawm cov tshuaj ntxiv 3 yog li 25% siab dua li ntawm cov qauv dawb paug. Qhov sib txawv ntawm cov tshuaj ntxiv 1 thiab cov tshuaj ntxiv 3 feem ntau yog vim qhov sib txawv ntawm qhov ntub ntawm cov khoom sib xyaw ntawm qhov chaw. Feem ntau, txhawm rau ntsuas qhov ntub ntawm cov kua ntawm cov khoom khov, lub kaum sab xis sib cuag yog qhov tseem ceeb los ntsuas qhov ntub ntawm qhov chaw. Yog li ntawd, lub kaum sab xis sib cuag ntawm cov khoom sib xyaw thiab daim tawv nqaij tom qab ntxiv ob cov tshuaj dispersants ntub dej saum toj no tau sim, thiab cov txiaj ntsig tau pom hauv Daim Duab 1.
Los ntawm Daim Duab 1, koj tuaj yeem pom tias lub kaum sab xis ntawm cov qauv dawb paug yog qhov loj tshaj plaws, uas yog 27 °, thiab lub kaum sab xis ntawm tus neeg sawv cev pabcuam 3 yog qhov me tshaj plaws, uas tsuas yog 12 °. Qhov no qhia tau hais tias kev siv cov khoom ntxiv 3 tuaj yeem txhim kho qhov ntub ntawm cov khoom sib xyaw thiab daim tawv nqaij kom ntau dua, thiab nws yooj yim dua rau kev nthuav dav ntawm qhov chaw ntawm daim tawv nqaij, yog li kev siv cov khoom ntxiv 3 muaj lub zog tev tawv loj tshaj plaws.
Cov khoom qub
Cov khoom siv tes tuav tau nias rau hauv lub tsheb, qhov zaus ntawm kev raug tshav ntuj siab, thiab kev ua haujlwm laus yog lwm qhov kev ua tau zoo tseem ceeb uas polyurethane semi-rigid handrail ua npuas ncauj yuav tsum xav txog. Yog li ntawd, kev ua haujlwm laus ntawm cov mis yooj yim tau sim thiab kev tshawb fawb txhim kho tau ua tiav, thiab cov txiaj ntsig tau pom hauv Rooj 4.
Los ntawm kev sib piv cov ntaub ntawv hauv Rooj 4, nws tuaj yeem pom tias cov khoom siv kho tshuab thiab cov khoom sib txuas ntawm cov mis yooj yim tau txo qis tom qab kev laus thermal ntawm 120 ℃: tom qab laus rau 12 teev, qhov poob ntawm ntau yam khoom tshwj tsis yog qhov ceev (tib yam hauv qab no) yog 13% ~ 16%; Qhov kev poob ntawm 24 teev laus yog 23% ~ 26%. Nws tau qhia tias cov khoom siv laus cua sov ntawm cov mis yooj yim tsis zoo, thiab cov khoom siv laus cua sov ntawm cov mis thawj tuaj yeem txhim kho tau zoo los ntawm kev ntxiv A chav kawm ntawm antioxidant A rau cov mis. Nyob rau hauv tib qho kev sim tom qab ntxiv antioxidant A, qhov poob ntawm ntau yam khoom tom qab 12 teev yog 7% ~ 8%, thiab qhov poob ntawm ntau yam khoom tom qab 24 teev yog 13% ~ 16%. Qhov txo qis ntawm cov khoom siv kho tshuab yog feem ntau vim yog cov tshuaj sib xyaw ua ke uas tshwm sim los ntawm kev tawg ntawm cov tshuaj sib txuas thiab cov dawb radicals thaum lub sijhawm laus thermal, ua rau muaj kev hloov pauv tseem ceeb hauv cov qauv lossis cov khoom ntawm cov khoom qub. Ntawm ib sab tes, qhov kev poob qis hauv kev ua haujlwm sib txuas yog vim qhov kev poob qis ntawm cov khoom siv kho tshuab ntawm cov ua npuas ncauj nws tus kheej, ntawm qhov tod tes, vim tias daim tawv nqaij PVC muaj ntau cov yas, thiab cov yas hloov mus rau qhov chaw thaum lub sijhawm thermal oxygen laus. Kev ntxiv cov antioxidants tuaj yeem txhim kho nws cov khoom thermal laus, feem ntau vim tias cov antioxidants tuaj yeem tshem tawm cov dawb radicals tshiab, ncua lossis txwv tsis pub cov txheej txheem oxidation ntawm cov polymer, yog li kom tswj tau cov khoom qub ntawm cov polymer.
Kev ua tau zoo tag nrho
Raws li cov txiaj ntsig saum toj no, cov mis zoo tshaj plaws tau tsim thiab nws cov khoom sib txawv tau raug soj ntsuam. Kev ua tau zoo ntawm cov mis tau muab piv rau cov polyurethane ua npuas ncauj siab rov qab los ntawm tes. Cov txiaj ntsig tau qhia nyob rau hauv Rooj 5.
Raws li pom los ntawm Rooj 5, kev ua tau zoo ntawm cov mis ua npuas polyurethane semi-rigid zoo tshaj plaws muaj qee qhov zoo dua li cov mis yooj yim thiab dav dav, thiab nws muaj txiaj ntsig zoo dua, thiab nws tsim nyog dua rau kev siv cov tes tuav ua haujlwm siab.
Xaus lus
Kev kho qhov ntau ntawm polyether thiab xaiv cov tshuaj dispersant thiab antioxidant uas tsim nyog tuaj yeem muab cov khoom siv kho tshuab zoo rau cov ua npuas polyurethane semi-rigid, cov khoom siv kub zoo heev thiab lwm yam. Raws li kev ua tau zoo ntawm cov ua npuas, cov khoom ua npuas polyurethane semi-rigid no tuaj yeem siv rau cov khoom siv buffer hauv tsheb xws li cov tes tuav thiab cov rooj ntsuas.
Lub sijhawm tshaj tawm: Lub Xya Hli-25-2024