Kev npaj thiab cov yam ntxwv ntawm polyurethane semi-rigid ua npuas ncauj rau high-kev ua tau zoo automotive handrails.
Lub armrest nyob rau sab hauv ntawm lub tsheb yog ib qho tseem ceeb ntawm lub tsheb tavxij, uas ua lub luag haujlwm ntawm kev thawb thiab rub lub qhov rooj thiab tso caj npab ntawm tus neeg 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 khoom siv tawv tawv, tuaj yeem muab elasticity thiab tsis zoo, yog li txo kev raug mob. Polyurethane soft foam handrails tuaj yeem muab txhais tes zoo thiab zoo nkauj zoo nkauj, yog li txhim kho kev nplij siab thiab kev zoo nkauj ntawm lub cockpit. Yog li ntawd, nrog rau txoj kev loj hlob ntawm kev lag luam tsheb thiab kev txhim kho ntawm tib neeg cov kev xav tau ntawm cov khoom siv sab hauv, qhov zoo ntawm polyurethane mos ua npuas ncauj hauv tsheb tuav tau dhau los ua pom tseeb.
Muaj peb hom polyurethane soft handrails: siab resilience ua npuas ncauj, self-crusted ua npuas ncauj thiab semi-rigid ua npuas ncauj. Sab nrauv ntawm lub siab resilience handrails yog them nrog PVC (polyvinyl chloride) daim tawv nqaij, thiab sab hauv yog polyurethane siab resilience ua npuas ncauj. Kev txhawb nqa ntawm cov npuas dej yog qhov tsis muaj zog, lub zog yog qhov tsawg, thiab qhov adhesion ntawm cov npuas dej thiab cov tawv nqaij yog qhov tsis txaus. Tus kheej-skinned handrail muaj ib tug ua npuas ncauj core txheej ntawm daim tawv nqaij, tsis tshua muaj nqi, siab integration degree, thiab yog dav siv nyob rau hauv kev lag luam tsheb, tab sis nws yog ib qho nyuaj rau coj mus rau hauv tus account lub zog ntawm lub nto thiab tag nrho cov kev nplij siab. Semi-rigid armrest yog npog nrog PVC daim tawv nqaij, daim tawv nqaij muab zoo kov thiab zoo li, thiab lub sab hauv semi-rigid ua npuas ncauj muaj kev xav zoo heev, cuam tshuam tsis kam, lub zog nqus thiab aging kuj, yog li nws yog ntau thiab ntau lug siv nyob rau hauv kev siv. neeg nrog caij tsheb sab hauv.
Nyob rau hauv daim ntawv no, cov mis mos ntawm polyurethane semi-rigid ua npuas ncauj rau tsheb handrails yog tsim, thiab nws cov kev txhim kho yog kawm nyob rau hauv lub hauv paus no.
Kev sim seem
Main raw khoom
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. Modified 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 industrial. PVC hauv ob sab phlu: Changshu Ruihua.
Cov khoom siv tseem ceeb thiab cov cuab yeej siv
Sdf-400 hom high-speed tov khoom, AR3202CN hom hluav taws xob tshuav nyiaj li cas, txhuas pwm (10cm × 10cm × 1cm, 10cm × 10cm × 5cm), 101-4AB hom hluav taws xob blower qhov cub, KJ-1065 hom hluav taws xob universal nro tshuab, 501A hom super ntsuas kub.
Kev npaj cov qauv tsim thiab qauv
Lub hauv paus formulation ntawm semi-rigid polyurethane ua npuas ncauj yog qhia nyob rau hauv Table 1.
Kev npaj ntawm cov khoom siv kho tshuab kuaj qauv: cov khoom sib xyaw polyether (A cov khoom siv) tau npaj raws li cov qauv tsim, sib xyaw nrog cov hloov kho MDI hauv ib qho kev faib ua feem, nplawm nrog cov khoom siv ceev ceev (3000r / min) rau 3 ~ 5s , ces ncuav rau hauv cov pwm coj mus ua npuas ncauj, thiab qhib lub pwm nyob rau hauv ib lub sij hawm kom tau lub semi-rigid polyurethane ua npuas ncauj molded qauv.
Kev npaj ntawm cov qauv rau kev sib raug zoo kev xeem: ib txheej ntawm PVC daim tawv nqaij yog muab tso rau hauv lub qis tuag ntawm cov pwm, thiab cov polyether thiab hloov kho MDI yog sib tov nyob rau hauv feem, stirred los ntawm ib tug high-speed stirring ntaus ntawv (3 000 r / min. ) rau 3 ~ 5 s, ces nchuav rau saum npoo ntawm daim tawv nqaij, thiab cov pwm raug kaw, thiab polyurethane ua npuas ncauj nrog daim tawv nqaij yog molded nyob rau hauv ib lub sij hawm.
Kev xeem ua haujlwm
Cov khoom siv tshuab: 40% CLD (compressive hardness) raws li ISO-3386 tus qauv xeem; Tensile lub zog thiab elongation ntawm kev tawg raug kuaj raws li ISO-1798 tus qauv; Tear lub zog raug kuaj raws li ISO-8067 tus qauv. Bonding kev ua tau zoo: Lub tshuab hluav taws xob universal nro yog siv los tev daim tawv nqaij thiab ua npuas ncauj 180 ° raws li tus qauv ntawm OEM.
Kev laus kev ua haujlwm: Ntsuas qhov poob ntawm cov khoom siv 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
Cov cuab yeej cuab tam
Los ntawm kev hloov qhov piv ntawm polyether polyol A thiab polymer polyol B nyob rau hauv cov qauv qauv, qhov kev cuam tshuam ntawm polyether ntau npaum li cas ntawm cov khoom siv ntawm semi-rigid polyurethane ua npuas ncauj tau tshawb pom, raws li qhia hauv Table 2.
Nws tuaj yeem pom los ntawm cov txiaj ntsig hauv Table 2 tias qhov piv ntawm polyether polyol A rau polymer polyol B muaj qhov cuam tshuam loj rau cov khoom siv ntawm polyurethane ua npuas ncauj. Thaum qhov sib piv ntawm polyether polyol A rau polymer polyol B nce, qhov elongation ntawm tawg nce, compressive hardness txo mus rau ib qho twg, thiab lub zog tensile thiab tearing zog hloov me ntsis. Cov saw molecular ntawm polyurethane feem ntau muaj cov ntu mos thiab ntu tawv, ntu mos ntawm polyol thiab ntu ntu ntawm carbamate daim ntawv cog lus. Ntawm qhov tod tes, qhov txheeb ze molecular hnyav thiab hydroxyl tus nqi ntawm ob polyols sib txawv, ntawm qhov tod tes, cov polymer polyol B yog polyether polyol hloov los ntawm acrylonitrile thiab styrene, thiab rigidity ntawm cov saw ntu yog txhim kho vim yog muaj nyob ntawm benzene nplhaib, thaum lub polymer polyol B muaj cov khoom me me molecular, uas ua rau kom lub brittleness ntawm npuas. Thaum polyether polyol A yog 80 qhov chaw thiab polymer polyol B yog 10 qhov chaw, cov khoom siv txhua yam ntawm cov npuas dej zoo dua.
Bonding khoom
Raws li cov khoom lag luam nrog cov xovxwm siab, lub tes tuav yuav txo qhov kev nplij siab ntawm qhov chaw yog tias ua npuas ncauj thiab daim tawv nqaij tev, yog li kev sib koom ua ke ntawm polyurethane ua npuas ncauj thiab tawv nqaij yuav tsum tau ua. Raws li kev tshawb fawb saum toj no, sib txawv wetting dispersants tau ntxiv los kuaj cov khoom adhesion ntawm cov npuas dej thiab daim tawv nqaij. Cov txiaj ntsig tau pom nyob rau hauv Table 3.
Nws tuaj yeem pom los ntawm Table 3 tias cov khoom ntub dej sib txawv muaj qhov cuam tshuam zoo rau lub tev tawm ntawm cov npuas dej thiab daim tawv nqaij: Ua npuas ncauj tawg tshwm sim tom qab siv cov tshuaj ntxiv 2, uas yuav tshwm sim los ntawm kev qhib ntau dhau ntawm cov npuas dej tom qab ntxiv cov tshuaj ntxiv. 2; Tom qab siv cov khoom ntxiv 1 thiab 3, lub zog stripping ntawm cov qauv dawb paug muaj qhov nce ntxiv, thiab lub zog stripping ntawm cov khoom ntxiv 1 yog li 17% siab dua li ntawm cov qauv dawb paug, thiab lub zog stripping ntawm cov khoom ntxiv 3 yog li ntawm 25% siab dua li ntawm cov qauv dawb paug. Qhov sib txawv ntawm additive 1 thiab additive 3 feem ntau yog tshwm sim los ntawm qhov sib txawv ntawm lub wettability ntawm cov khoom sib xyaw ntawm qhov chaw. Feem ntau, txhawm rau ntsuas qhov ntub dej ntawm cov kua ntawm cov khoom, qhov kev sib cuag lub kaum yog qhov tseem ceeb rau kev ntsuas qhov ntub dej ntawm qhov chaw. Yog li ntawd, qhov kev sib cuag ntawm lub kaum sab xis ntawm cov khoom sib xyaw thiab cov tawv nqaij tom qab ntxiv cov saum toj no ob qhov kev sib cais ntawm cov dej ntub dej tau sim, thiab cov txiaj ntsig tau pom hauv daim duab 1.
Nws tuaj yeem pom los ntawm daim duab 1 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 3 yog qhov tsawg tshaj plaws, uas tsuas yog 12 °. Qhov no qhia tau hais tias kev siv cov additive 3 tuaj yeem txhim kho cov wettability ntawm cov khoom sib xyaw thiab cov tawv nqaij kom ntau dua, thiab nws yooj yim dua rau kev sib kis ntawm daim tawv nqaij, yog li kev siv cov additive 3 muaj lub zog loj tshaj plaws.
Cov cuab yeej laus
Cov khoom siv tes tuav tau nias rau hauv lub tsheb, qhov zaus ntawm lub hnub ci raug siab, thiab kev laus kev ua haujlwm yog lwm qhov kev ua haujlwm tseem ceeb uas polyurethane semi-rigid handrail ua npuas ncauj yuav tsum xav txog. Yog li ntawd, kev laus kev ua tau zoo ntawm cov qauv yooj yim tau sim thiab kev txhim kho kev kawm tau ua tiav, thiab cov txiaj ntsig tau pom nyob rau hauv Table 4.
Los ntawm kev sib piv cov ntaub ntawv hauv Table 4, nws tuaj yeem pom tias cov khoom siv kho tshuab thiab cov khoom sib txuas ntawm cov qauv yooj yim tau txo qis tom qab thermal aging ntawm 120 ℃: tom qab kev laus rau 12h, qhov poob ntawm ntau yam khoom tshwj tsis yog qhov ntom ntom (ib yam hauv qab no) yog 13% ~ 16%; Kev ua haujlwm poob ntawm 24h laus yog 23% ~ 26%. Nws tau qhia tias cov khoom siv hluav taws xob kub ntawm cov qauv yooj yim tsis zoo, thiab cov khoom siv hluav taws xob kub ntawm cov qauv qub tuaj yeem ua kom pom tseeb los ntawm kev ntxiv A chav kawm ntawm antioxidant A rau cov mis. Nyob rau hauv tib txoj kev sim tom qab sib ntxiv ntawm antioxidant A, qhov poob ntawm ntau yam khoom tom qab 12h yog 7% ~ 8%, thiab poob ntawm ntau yam khoom tom qab 24h yog 13% ~ 16%. Kev txo qis ntawm cov khoom siv kho tshuab feem ntau yog vim muaj cov kev sib txuas ntawm cov saw hlau tshwm sim los ntawm cov tshuaj lom neeg tawg thiab cov dawb radicals thaum lub sij hawm thermal aging, uas ua rau muaj kev hloov pauv hauv cov qauv lossis cov khoom ntawm cov khoom qub. Ntawm qhov tod tes, qhov kev poob qis hauv kev sib koom ua ke yog vim qhov poob ntawm cov khoom siv ua npuas ncauj nws tus kheej, ntawm qhov tod tes, vim tias PVC daim tawv nqaij muaj ntau cov plasticizers, thiab cov plasticizer tsiv mus rau saum npoo thaum txheej txheem. ntawm thermal oxygen aging. Qhov sib ntxiv ntawm cov tshuaj antioxidants tuaj yeem txhim kho nws cov thermal aging, feem ntau vim tias antioxidants tuaj yeem tshem tawm cov dawb radicals tshiab, ncua lossis inhibit cov txheej txheem oxidation ntawm cov polymer, thiaj li tswj cov khoom qub ntawm cov polymer.
Kev ua tau zoo
Raws li cov txiaj ntsig saum toj no, cov qauv zoo tshaj plaws tau tsim thiab nws cov khoom sib txawv tau raug soj ntsuam. Qhov kev ua tau zoo ntawm cov mis tau muab piv nrog cov dav dav polyurethane siab rebound handrail ua npuas ncauj. Cov txiaj ntsig tau pom nyob rau hauv Table 5.
Raws li tau pom los ntawm Table 5, qhov kev ua tau zoo ntawm qhov zoo tshaj plaws semi-rigid polyurethane foam mis muaj qee qhov zoo ntawm cov qauv yooj yim thiab dav, thiab nws siv tau ntau dua, thiab nws yog qhov tsim nyog rau daim ntawv thov kev ua haujlwm siab.
Xaus
Kho tus nqi ntawm polyether thiab xaiv qhov tsim nyog wetting dispersant thiab antioxidant tuaj yeem muab cov semi-rigid polyurethane ua npuas ncauj zoo txhua yam khoom, zoo heev thaum tshav kub kub laus zog thiab lwm yam. Raws li kev ua tau zoo ntawm cov npuas dej, qhov kev ua tau zoo ntawm cov khoom siv polyurethane semi-rigid npuas no tuaj yeem siv rau cov khoom siv hauv tsheb xws li tes tuav thiab cov rooj ntsuas.
Post lub sij hawm: Lub Xya hli ntuj-25-2024