PP Vs PS Disposable Portion Cups: Uas Muaj Kub Kub Resistant?

2.1 Basic Properties ntawm PP Khoom

PP (polypropylene) yog cov thermoplastic polymer tau los ntawm cov saw hlau polymerization ntawm propylene monomers. Nws cov qauv molecular txiav txim siab nws cov cua sov zoo heev. PP molecular saw muaj ib qho kev ua haujlwm tsis tu ncua, feem ntau yog isotactic lossis syndiotactic, thiab qhov kev ua haujlwm no muab cov khoom zoo crystallinity. PP molecular saw muaj methyl sab pawg, uas, txawm tias me me hauv ntim, ua lub luag haujlwm tseem ceeb hauv kev txhim kho thermal stability ntawm cov polymer.

Los ntawm cov khoom siv lub cev, PP yog ib nrab -crystalline polymer, nrog crystallinity feem ntau ntawm 50% thiab 65%. Qhov siab crystallinity no tsis tsuas yog nce qhov ntom thiab rigidity ntawm cov khoom tab sis kuj tseem txhim kho nws cov cua sov. Qhov ceev ntawm PP yog kwv yees li 0.90-0.91 g / cm³, yog ib qhov ntom ntom ntawm txhua cov yas. Cov yam ntxwv qis qis no ua rau cov khoom PP hnav thaum tuav lub zog zoo txhua yam.

Nyob rau hauv cov nqe lus ntawm thermal zog, PP exhibits zoo heev kub kuj. Nws cov ntsiab lus melting yog feem ntau ntawm 160-175 degree, sib txawv me ntsis nyob ntawm qib thiab crystallinity. Qhov tseem ceeb tshaj, PP muaj qhov kub thiab txias distortion (HDT), feem ntau ntawm 100-120 degree, thiab qee qhov kev hloov pauv tuaj yeem ncav cuag 145 degree. PP lub iav hloov pauv kub (Tg) kuj qis, kwv yees li -10℃rau -20 degree, txhais tau hais tias PP tuav zoo rigidity thiab toughness ntawm chav tsev kub.

PP kuj ua tau zoo heev nyob rau hauv cov nqe lus ntawm kev ruaj ntseg tshuaj, pom zoo ua hauj lwm rau feem ntau cov tshuaj, tshwj xeeb tshaj yog zoo heev corrosion kuj rau acids, bases, thiab ntsev. Cov tshuaj inertness no ua rau PP muaj kev nyab xeeb rau daim ntawv thov ntim khoom noj. Tsis tas li ntawd, PP cov qauv molecular tsis muaj cov pab pawg ua haujlwm raug rau thermal degradation, xws li phenolic pawg, uas ntxiv dag zog rau nws cov thermal stability.

2.2 Cov yam ntxwv tseem ceeb ntawm cov khoom siv PS

PS (polystyrene) yog ib qho thermoplastic polymer tsim los ntawm polymerization ntawm styrene monomers, thiab nws cov qauv molecular txawv ntawm cov PP. PS molecular saw muaj lub taub hau - mus rau -tail qauv, nrog ib tug saturated carbon saw raws li lub ntsiab saw thiab ib tug conjugated benzene nplhaib qauv raws li cov pab pawg neeg. Cov yam ntxwv ntawm cov qauv no muab PS molecular saw hnyav hnyav, vim tias cov qauv nruj ntawm lub nplhaib benzene thiab nws qhov loj steric hindrance txwv qhov kev sib hloov ntawm cov saw molecular.

PS yog ib tug raug amorphous polymer, feem ntau vim hais tias muaj ntawm sab phenyl pawg ua rau cov qauv molecular tsis xwm yeem, ua rau nws nyuaj rau tsim ib qho kev txiav txim crystalline qauv. Qhov ceev ntawm PS yog kwv yees li 1.04-1.06 g / cm³, me ntsis siab dua li ntawm PP, uas muaj feem xyuam rau qhov muaj benzene rings hauv nws cov qauv molecular. PS muaj cov pob tshab zoo thiab gloss, nrog lub lig

Hais txog cov khoom siv thermal, PS ua haujlwm tsis zoo. Lub iav hloov pauv kub (Tg) ntawm PS yog qhov siab, feem ntau yog nyob nruab nrab ntawm 80-105 degree, feem ntau yog vim muaj zog ntxiv ntawm cov saw hlau molecular tshwm sim los ntawm qhov muaj benzene rings. Txawm li cas los xij, polystyrene (PS) muaj qhov sib txawv ntawm qhov kub thiab txias (HDT). Lub HDT ntawm dav dav -lub hom phiaj PS (GPPS) feem ntau yog nyob nruab nrab ntawm 70-90 degree, thaum lub siab cuam tshuam PS (HIPS) qis me ntsis, ntawm 60-80℃. PS muaj qhov sib txawv ntawm qhov kub thiab txias, feem ntau ntawm 150-180 degree, thaum nws cov thermal decomposition kub tuaj yeem ncav cuag 300 degree.

PS nthuav tawm cov tshuaj lom neeg nruab nrab thiab tsis zoo rau cov kuab tshuaj organic, yooj yim o los yog yaj. Nyob rau tib lub sijhawm, PS yog nquag oxidative degradation ntawm qhov kub thiab txias, thiab cov txheej txheem kev laus yog nrawm dua nyob rau hauv ultraviolet irradiation. Cov khoom siv kho tshuab ntawm PS yog tus cwj pwm los ntawm kev ua haujlwm siab tab sis tsis zoo toughness, uas txwv tsis pub nws siv hauv cov ntawv thov uas yuav tsum muaj kev cuam tshuam.

2.3 Mechanism of Molecular Structure's Influence on Heat Resistance

Qhov sib txawv ntawm qhov kub tsis kam ntawm PP thiab PS hauv paus yog los ntawm lawv cov qauv sib txawv. Raws li ib tug semi-crystalline polymer, kev ua haujlwm tsis tu ncua ntawm PP molecular chains thiab nws cov crystallinity siab yog cov laj thawj tseem ceeb rau nws cov cua sov zoo heev. Lub xub ntiag ntawm crystalline cheeb tsam txwv tsis pub txav ntawm cov saw hlau molecular, xav tau lub zog ntau dua los rhuav tshem cov qauv no; Yog li ntawd, PP muaj qhov siab tshaj qhov melting thiab kub distortion kub.

Txawm hais tias pawg methyl sab hauv PP molecular saw nce steric hindrance, cov methyl pawg no cuam tshuam los ntawm van der Waals rog, ntxiv dag zog rau cov rog intermolecular thiab txhim kho thermal stability ntawm cov khoom. Nyob rau tib lub sijhawm, saturated carbon saw qauv ntawm PP muab cov tshuaj zoo inertness, ua rau nws tsis tshua muaj oxidation lossis degradation tshwm sim ntawm qhov kub thiab txias.

Hauv qhov sib piv, qhov tsis yog - cov qauv crystalline ntawm PS yog qhov laj thawj tseem ceeb rau nws cov cua sov tsis zoo. Txawm hais tias lub xub ntiag ntawm benzene rings nce lub rigidity ntawm molecular saw thiab iav hloov kub, cov qauv nruj no kuj ua rau cov saw hlau molecular muaj kev ntxhov siab nyob rau hauv qhov kub thiab txias, ua rau cov khoom embrittlement. Thaum cov pab pawg phenyl sab hauv PS nce rigidity ntawm cov saw hlau molecular, lawv kuj txo nws txoj kev yooj, ua rau nws yooj yim tawg thaum raug thermal stress.

Tsis tas li ntawd, benzene nplhaib qauv nyob rau hauv PS molecular saw yog nquag oxidation tshwm sim ntawm qhov kub thiab txias, tshwj xeeb tshaj yog nyob rau hauv ib qho chaw oxygen - nplua nuj, uas ua rau cov txheej txheem degradation. Kev tshawb fawb qhia tias PS tuaj yeem decompose rau hauv styrene monomers thiab lwm yam qis -molecular- hnyav sib txuas ntawm 200 degree, thiab cov khoom decomposition no yuav cuam tshuam rau tib neeg kev noj qab haus huv.

3.1 Ntev-Lub Sijhawm Kev Pabcuam Kub Kub

Hais txog qhov ntev - qhov kub thiab txias, PP thiab PS qhia qhov sib txawv tseem ceeb. Raws li ntau cov ntaub ntawv tshawb fawb, qhov ntev -lub sij hawm qhov kub ntawm cov khoom siv PP feem ntau yog -20℃txog 120 degree, thiab qee qhov kev ua tau zoo - qib PP tuaj yeem siv tau ntev dua 120℃. Qhov ntsuas kub no tso cai rau PP kom ua tau raws li cov kev xav tau ntawm cov ntawv ntim khoom noj feem ntau, suav nrog kev ntim khoom kub, cia kub kub, thiab cua sov microwave.

Qhov ntev -lub sij hawm kub tsis kam ntawm PP yog vim nws cov crystallinity siab thiab ruaj khov molecular qauv. Nyob rau hauv qhov kub ntawm 100-120 degree, PP tuaj yeem tswj cov khoom zoo ntawm lub cev thiab tshuaj lom neeg ruaj khov yam tsis muaj deformation lossis degradation. Tshwj xeeb tshaj yog nyob rau hauv daim ntawv thov kev sib cuag zaub mov, PP yog suav hais tias yog ib qho ntawm cov khoom siv yas zoo tshaj plaws thiab tuaj yeem siv tau ntev nyob rau hauv qhov kub thiab txias yam tsis tso cov tshuaj phem.

Hauv qhov sib piv, qhov ntev -lub sij hawm kev pab cuam qhov kub thiab txias ntawm PS cov khoom yog qis dua, feem ntau yog -40℃txog 90 degree, tab sis nws raug pom zoo kom tsis pub tshaj 60-80℃hauv daim ntawv thov tiag tiag. PS tej zaum yuav pib soften thiab deform saum toj no 70 degree, thiab ntev - siv nyob rau hauv high-temperature ib puag ncig yuav ua rau ib tug tseem ceeb txo nyob rau hauv cov ntaub ntawv kev ua tau zoo. Qhov kev txwv kub no feem ntau yog vim cov qauv tsis-crystalline ntawm PS thiab tsis muaj zog intermolecular rog.

Nws yog tsim nyog sau cia tias qhov kev ua tau zoo ntawm PS sib txawv heev ntawm qhov kub thiab txias. Cov kev tshawb fawb tau pom tias tom qab 24 teev ntawm kev khaws cia ntawm 70 degree, cov khoom siv kho tshuab ntawm PS cov ntawv txheeb tau txo qis, thiab cov kab nrib pleb yuav tshwm sim thaum siv tom ntej. Ntawm 30 degree, PS cov ntawv nthuav tawm qhov kev ua tau zoo tshaj plaws, suav nrog kev ntxhov siab thiab elongation thaum so.

3.2 Luv luv -Lub Sijhawm Kub Kub Resistance Limit

Hais txog luv luv -lub sij hawm tshav kub tsis kam, PP kuj ua tau zoo dua PS. Lub sij hawm luv luv -lub sij hawm tshav kub tsis kam ntawm PP cov ntaub ntawv feem ntau yog nyob nruab nrab ntawm 130-150 degree, thiab qee qhov tshwj xeeb hloov qib tuaj yeem ncav cuag 170 degree. Qhov luv luv no -lub sij hawm tshav kub tsis kam tso cai rau PP los tiv thaiv kev kub kub xws li kub filling thiab chav kom tsis muaj menyuam.

Qhov luv luv -lub sij hawm tshav kub tsis kam ntawm PP yog tsuas yog txwv los ntawm nws cov ntsiab lus melting. Thaum qhov kub los yog siab tshaj qhov melting point ntawm PP (160-175 degree), cov khoom yuav pib soften, deform, los yog txawm yaj, poob nws cov qauv qub thiab txhua yam khoom. Txawm li cas los xij, nyob rau hauv qhov kub thiab txias hauv qab lub melting point, qhov kub tsis kam ntawm PP feem ntau tsis txo qis, thiab nws tuaj yeem ua haujlwm zoo.

Lub sij hawm luv luv -lub sij hawm tshav kub tsis kam ntawm PS cov khoom yog qhov tsawg, feem ntau ntawm 90-110℃. Thaum qhov kub siab tshaj 90 degree, PS tej zaum yuav raug deformation tseem ceeb, thiab nws yuav soften ntawm 100 degree. Qhov kub thiab txias no txwv tsis pub siv PS hauv cov ntawv thov uas yuav tsum tau ua haujlwm rau qhov kub thiab txias.

Qhov luv luv -lub sij hawm tshav kub tsis kam ntawm PS yog tsuas yog txwv los ntawm nws cov iav hloov kub thiab kub distortion kub. Thaum qhov kub nce mus txog Tg, qhov txav ntawm PS molecular chains nce, thiab cov khoom pib poob rigidity; Thaum qhov kub nce mus txog qhov kub ntawm qhov kub thiab txias, cov khoom yuav raug deformation tseem ceeb hauv kev thauj khoom.

3.3 Heat Distortion Temperature (HDT) Sib piv

Thaum tshav kub kub distortion kub (HDT) yog ib qho tseem ceeb rau kev ntsuas lub peev xwm ntawm cov ntaub ntawv yas los tiv thaiv deformation nyob rau hauv tej loads, thiab nws kuj yog ib tug tseem ceeb parameter rau kev ntsuam xyuas cov tshav kub tsis kam ntawm cov ntaub ntawv. Raws li cov qauv thoob ntiaj teb ASTM D648 thiab ISO 75, HDT kev xeem feem ntau ua tau raws li ob lub ntsiab lus: 1.82MPa thiab 0.45MPa.

Raws li cov qauv ntsuas, PP thiab PS qhia qhov sib txawv tseem ceeb hauv HDT. HDT ntawm PP cov ntaub ntawv feem ntau yog 100-120℃nyob rau hauv ib tug 0.45MPa load thiab 50-60℃nyob rau hauv ib tug 1.82MPa load. Qee cov qib PP ua tau zoo, xws li Hanwha Total's HJ730 thiab HJ730L, tuaj yeem ncav cuag HDT ntawm 125 degree. Tom qab kev hloov kho los ntawm kev ntxiv 30% talc hmoov thiab lwm cov fillers, HDT ntawm PP tuaj yeem nce ntxiv mus txog 145 degree.

HDT ntawm PS cov ntaub ntawv yog qhov tsawg. General-Lub hom phiaj PS (GPPS) muaj HDT ntawm 70-90℃nyob rau hauv 0.45MPa load thiab 60-80℃nyob rau hauv 1.82MPa load. Kev cuam tshuam loj ntawm polystyrene (HIPS), vim qhov sib ntxiv ntawm cov khoom siv roj hmab, muaj qhov qis me ntsis HDT, xws li 60-80℃hauv qab 0.45 MPa load.

Qhov sib txawv hauv HDT ncaj qha qhia txog lub peev xwm ntawm ob cov ntaub ntawv los tswj kev nruj ntawm qhov kub thiab txias. Vim nws cov semi-crystalline qauv thiab muaj zog intermolecular rog, PP muaj peev xwm tswj tau zoo rigidity ntawm siab dua kub, thaum PS, vim nws tsis yog -crystalline qauv thiab kuj tsis muaj zog intermolecular rog, muaj zog deformation nyob rau hauv qis kub.

3.4 Vicat Softening Point (VST) Sib piv

Lub Vicat softening point (VST) yog lwm qhov tseem ceeb qhia txog kev tiv thaiv tshav kub, xav txog qhov kub thiab txias uas cov khoom pib soften nyob rau hauv tej yam kev mob. Kev ntsuas VST feem ntau siv cov khoom thauj ntawm 10N (A50 txoj kev) lossis 50N (B120 txoj kev), nrog rau cov cua sov ntawm 50℃/ h lossis 120℃/ h, raws li.

Vicat softening point ntawm PP cov ntaub ntawv feem ntau yog nyob nruab nrab ntawm 120-150 degree, nrog rau cov nqi tshwj xeeb nyob ntawm qhov kev xeem thiab qib khoom. Piv txwv li, PP qauv muaj Vicat softening kub ntawm 124.3℃nyob rau hauv ib tug 50N load thiab cua sov tus nqi ntawm 50℃/ h. Qee cov qib PP ua tau zoo tuaj yeem ncav cuag Vicat softening point ntawm 150℃lossis siab dua.

Vicat softening point range rau PS cov ntaub ntawv feem ntau yog 85-105 degree, nrog rau tus nqi tshwj xeeb kuj cuam tshuam los ntawm kev sim thiab hom khoom. General-purpose PS feem ntau muaj Vicat softening point ntawm 90-100 degree, thaum qee cov qib tshwj xeeb yuav txawv me ntsis.

Muaj qee qhov kev sib raug zoo ntawm VST thiab HDT; Feem ntau, VST siab dua HDT vim tias qhov muag muag feem ntau tshwm sim ua ntej tag nrho deformation. Rau tib cov khoom, qhov piv ntawm VST rau HDT feem ntau yog nruab nrab ntawm 1.1 thiab 1.3. Qhov sib txawv ntawm PP thiab PS raws li VST kuj qhia txog lawv qhov sib txawv hauv cov qauv molecular thiab thermal zog.

3.5 Kev hloov ntawm lub cev muaj zog ntawm qhov kub thiab txias

Nyob rau hauv siab - qhov kub thiab txias, ob qho tib si PP thiab PS tau hloov pauv hauv lawv lub cev, tab sis qib thiab daim ntawv ntawm cov kev hloov pauv no txawv heev. PP nthuav tawm cov kev hloov me me hauv kev ua haujlwm ntawm qhov kub thiab txias, feem ntau tshwm sim raws li kev maj mam txo qis hauv cov qauv thiab lub zog, tsis muaj kev ua haujlwm sai sai.

Cov kev tshawb fawb qhia tau hais tias qhov kev hloov pauv ntawm cov khoom siv kho tshuab ntawm PP ntawm qhov kub thiab txias yog ze rau nws cov crystallinity. Raws li qhov kub thiab txias, cov cheeb tsam crystalline ntawm PP maj mam muag, ua rau txo qis hauv cov qauv thiab lub zog, tab sis qhov kev hloov pauv no yog ib qho txheej txheem maj mam. Hauv qab 100 degree, qhov kev hloov pauv ntawm PP feem ntau tsis tseem ceeb; Thaum qhov kub siab tshaj 120 degree, qhov kev ua tau zoo degradation nrawm, tab sis cov khoom tseem tuaj yeem tswj tau qee yam khoom siv tau.

Kev hloov pauv ntawm PS ntawm qhov kub thiab txias yog qhov ua tau zoo dua. Thaum qhov kub thiab txias mus txog nws qhov kub hloov pauv iav, qhov hloov pauv ntawm PS poob qis, thiab cov khoom hloov pauv los ntawm lub xeev nruj mus rau lub xeev hloov tau. Qhov kev hloov pauv no sai sai thiab feem ntau tshwm sim nyob rau hauv qhov kub me me, ua rau muaj kev hloov pauv tseem ceeb.

Cov kub kub kuj tseem cuam tshuam rau thermal expansion zog ntawm ob qho khoom siv. Lub thermal expansion coefficient ntawm PP feem ntau yog nyob rau hauv thaj tsam ntawm 5-10 × 10⁻⁵ / degree, thaum lub thermal expansion coefficient ntawm PS yog me ntsis siab dua, kwv yees li 6-8 × 10⁻⁵ / degree. Qhov sib txawv no yuav tsum tau xav txog thaum tsimpov tseg feem khob, tshwj xeeb tshaj yog thaum lawv yuav tsum tau siv nrog rau lwm yam ntaub ntawv.

Tsis tas li ntawd, qhov kub thiab txias kuj cuam tshuam rau thermal conductivity ntawm cov ntaub ntawv. Cov kev tshawb fawb tau pom tias qee cov yas, xws li polystyrene, qhia tau zoo thermal conductivity ntawm qhov kub thiab txias, tab sis nws tseem tsis txaus kom ua tau raws li cov kev xav tau ntawm siab - kev ua haujlwm thermal tswj kev siv. Hauv qhov sib piv, cov thermal conductivity ntawm PP hloov tsawg dua ntawm qhov kub thiab txias, tswj cov thermal rwb thaiv tsev zoo..

4.1 Cov kev sib tw ntawm qhov ntsuas kub siv tiag tiag

Cov khob ntim pov tseg tau ntsib ntau yam teeb meem kub hauv kev siv tiag tiag, uas tso cov kev xav tau tshwj xeeb ntawm cov khoom siv hluav taws xob. Ua ntej yog cov txheej txheem kub filling; ntau hom kua ntses muaj qhov sib txawv ntawm qhov kub thiab txias. Raws li kev lag luam cov ntaub ntawv, qhov ntsuas kub rau cov txiv lws suav ntshiab yog feem ntau ntawm 85-92 degree, txiv hmab txiv ntoo jam yog 80-88 degree, chili sauce yog 85-90 degree, taum paste yog 85-90 degree, thaum soy sauce muaj ib tug kuj qis filling kub ntawm 75-80 degree.Cov kub filling kub ncaj qha cuam tshuam cov kev xav tau ntawm cov cua sov ntawm cov khoom siv pov tseg. Vim nws qhov kub tsis kam, cov khoom PP tuaj yeem tiv taus qhov kub thiab txias yam tsis muaj deformation lossis kev ua haujlwm degradation. Cov kev tshawb fawb pom tau tias PP cov khob ntim pov tseg tuaj yeem tiv taus qhov kub siab tshaj 100 degree, ua tau raws li cov kev xav tau ntawm cov khoom kub. PS cov ntaub ntawv, txawm li cas los xij, tuaj yeem muag thiab deform thaum raug rau qhov kub siab tshaj 80 degree.

Qhov thib ob, muaj qhov cub microwave cua sov scenario. Nrog rau qhov muaj koob meej ntawm cov khoom noj khoom haus thiab khoom noj ceev, ntau thiab ntau lub khob pov tseg yuav tsum tau microwaveable. PP cov khoom yog tib yam khoom yas uas tuaj yeem ua rau microwaved zoo, nrog rau qhov kub thiab txias ntawm -20℃txog 120 degree, ua tau raws li qhov xav tau ntawm microwave cua sov. PS cov ntaub ntawv, vim nws cov cua sov tsis zoo, tsis haum rau microwave cua sov, vim nws tuaj yeem ua rau lub thawv deformation lossis txawm tso tawm cov khoom tsis zoo.

Thib peb, muaj - qhov kub thiab txias cia txias txias. Hauv qee qhov xwm txheej, cov khob ntim khoom pov tseg yuav tsum tau muab khaws cia rau hauv qhov chaw siab - qhov kub thiab txias, xws li sab hauv lub tsheb thaum caij tsheb npav caij ntuj sov, qhov kub tuaj yeem ncav cuag 50-60 degree, lossis siab dua. PP cov ntaub ntawv tswj kev ua haujlwm ruaj khov ntawm qhov kub thiab txias, thaum PS cov khoom yuav pib muaj kev hloov pauv kev ua haujlwm siab tshaj 60 degree.

4.2 Kub Filling Applicability Analysis

Kub filling yog ib kauj ruam tseem ceeb hauv kev tsim cov ntses, yuav tsum tau nruj me ntsis rau cov cua sov, thermal stability, thiab qhov ntev ntawm cov khoom ntim. Thaum lub sij hawm kub filling txheej txheem, cov ntses feem ntau yog ntim ntawm qhov kub ntawm 75-95 degree, ces kaw thiab txias. Cov txheej txheem no yuav tsum tau ntim cov khoom ntim kom tiv taus qhov kub thiab txias, tswj cov duab ruaj khov, thiab tsis hnov ​​​​tsw tshuaj nrog cov ntsiab lus.

PP cov ntaub ntawv ua tau zoo heev nyob rau hauv kub - sau ntawv. Nws cov cua kub tsis kam tso cai rau PP ntim kom tiv taus qhov kub siab tshaj 90℃yam tsis muaj deformation. Nyob rau tib lub sijhawm, PP muaj cov coefficient qis ntawm thermal expansion, tswj kev ruaj ntseg zoo thaum lub sij hawm hloov kub. Cov kev tshawb fawb pom tau tias PP tswj kev ua tau zoo ntawm kev sib khi zoo thaum lub sij hawm kub filling thiab tsis xau vim thermal expansion thiab contraction.

PS cov ntaub ntawv muaj kev txwv tseem ceeb hauv cov ntawv kub - sau ntawv. Vim nws tsis zoo cua sov ua hauj lwm, PS ntim yuav deform thaum raug mus filling kub siab tshaj 80 degree, cuam tshuam cov khoom zoo li thiab sealing kev ua tau zoo. Tshwj xeeb tshaj yog thaum sau qhov kub siab tshaj 85 degree, PS ntim yuav muaj kev cuam tshuam loj heev lossis txawm tias tawg. Yog li ntawd, cov khoom siv PS feem ntau tsis pom zoo rau cov khoom siv ntses uas xav tau cov khoom kub.

Ntxiv nrog rau qhov yuav tsum tau ua kom sov ncaj qha, cov txheej txheem kub filling kuj xav tau cov ntaub ntawv nrog cov tshuaj lom neeg zoo. Cov kua ntses feem ntau muaj cov kua qaub, ntsev, roj, thiab lwm yam khoom, uas tuaj yeem cuam tshuam nrog cov khoom ntim ntawm qhov kub thiab txias. Vim nws txoj kev ruaj ntseg zoo heev, cov khoom PP tuaj yeem tiv taus qhov yaig ntawm cov khoom no. PS cov ntaub ntawv, txawm li cas los xij, tuaj yeem o lossis degrade thaum raug rau qee yam tshuaj, cuam tshuam rau cov khoom zoo.

4.3 Microwave Heating Applicability Analysis

Microwave cua sov yog ib txoj hauv kev tseem ceeb hauv kev ua zaub mov niaj hnub thiab kev noj haus, ua kom muaj kev tshwj xeeb rau cov khoom ntim khoom raws li kev tiv thaiv tshav kub thiab qhov pom ntawm microwave. PP cov ntaub ntawv ua tau zoo heev nyob rau hauv daim ntawv thov cua sov microwave thiab tam sim no tsuas yog dav paub txog microwave- cov khoom yas zoo.

Kev siv lub microwave cua sov ntawm cov khoom siv PP feem ntau yog ua raws li cov yam ntxwv hauv qab no: Ua ntej, PP muaj qhov zoo ntawm microwave pob tshab, tso cai rau microwaves nkag mus thiab cua sov cov ntsiab lus smoothly; thib ob, PP nws tus kheej tsis tsim kom muaj cua sov thaum lub sij hawm microwave cua sov, tsis txhob muaj kev pheej hmoo ntawm lub thawv overheating; thib peb, qhov kub tsis kam ntawm PP tso cai rau nws tiv taus qhov kub thiab txias uas tuaj yeem ncav cuag lub sijhawm cua sov microwave, feem ntau siab dua 120 degree.

Hauv kev siv tswv yim, qee cov ntsiab lus siv yuav tsum tau muab sau tseg thaum microwaving PP cov khob ntim pov tseg. Nws raug nquahu kom qhib lub hau los yog tawm lub qhov cua thaum lub sij hawm cua sov kom tsis txhob muaj siab sab hauv los ntawm kev ua rau lub thawv tawg. Nyob rau tib lub sijhawm, lub sijhawm ntev siab - cua sov yuav tsum zam; Feem ntau, lub sijhawm cua sov yuav tsum tsis pub tshaj 3 feeb, thiab qhov kub yuav tsum tsis pub tshaj 120 degree.

Hauv qhov sib piv, cov khoom siv PS tsis haum rau microwave cua sov. Vim nws cov kev txwv tsis pub muaj cua sov, PS cov thawv ntim tau yooj yim deformation thaum lub sij hawm microwave cua sov, tshwj xeeb tshaj yog thaum kub siab tshaj 70 degree, qhov tseem ceeb softening yuav tshwm sim. Qhov tseem ceeb tshaj, PS tuaj yeem tso cov khoom tsis zoo ntawm qhov kub thiab txias, suav nrog styrene monomers, uas yuav cuam tshuam rau tib neeg kev noj qab haus huv.

Cov kev tshawb fawb tau pom tias PS ntim tsis tau tsuas yog ua rau lub cev deformation thaum lub sij hawm microwave cua sov tab sis kuj yuav raug hloov tshuaj, ua rau cov khoom degradation thiab tso tawm cov khoom tsis zoo. Yog li ntawd, txhawm rau ua kom muaj kev nyab xeeb ntawm cov zaub mov, PS cov khob ntim pov tseg yuav tsum tsis txhob siv rau microwave cua sov.

4.4 Siab -Tsuas Cia Cov Cuab Yeej

Cov khoom ua kua ntses tuaj yeem ntsib ntau yam siab - qhov kub thiab txias thaum lub sijhawm tsim khoom, kev thauj mus los, thiab kev cia khoom, uas ua rau lub sijhawm ntev - ntsuas qhov ntsuas kub ntawm cov khoom ntim. Nyob rau hauv siab - qhov kub ntawm lub caij ntuj sov ib puag ncig, qhov kub hauv lub tsheb thauj khoom tuaj yeem ncav cuag 50-60 degree, thiab lub tsev khaws khoom kub tuaj yeem ncav cuag 40-50℃. Cov ntsuas kub no yog qhov ntsuas hnyav rau kev ua haujlwm ruaj khov ntawm cov khoom ntim khoom.

PP cov khoom ua haujlwm ruaj khov nyob rau hauv siab - qhov kub thiab txias cia. Nws cov cua sov ua haujlwm siab thiab zoo thermal stability tso cai rau PP ntim khaws cia rau lub sijhawm ntev hauv ib puag ncig ntawm 50-60℃yam tsis muaj kev hloov pauv tseem ceeb. Cov kev tshawb fawb tau pom tias PP tuav cov khoom zoo, tshuaj lom neeg ruaj khov, thiab zoo li zoo thaum lub sij hawm kub cia.

PS cov ntaub ntawv ua haujlwm tsis zoo nyob rau hauv siab - qhov chaw cia khoom kub. Nyob rau hauv ib puag ncig saum 40 degree, PS ntim yuav pib muaj kev hloov pauv kev ua haujlwm, suav nrog kev hloov pauv, qhov daj daj, thiab cov khoom siv tsis zoo. Tshwj xeeb tshaj yog nyob rau hauv ib puag ncig saum toj 50 degree, qhov kev ua tau zoo ntawm PS ntim nrawm nrawm, uas tuaj yeem cuam tshuam cov khoom siv tau thiab zoo li zoo.

High - qhov kub thiab txias cia kuj tseem tuaj yeem cuam tshuam cov tshuaj lom neeg ruaj khov ntawm cov khoom. Nyob rau hauv qhov kub siab - ib puag ncig kub, cov khoom siv ntxiv hauv cov ntaub ntawv yas, xws li cov khoom ruaj khov, cov tshuaj tua kab mob antioxidant, thiab cov yas yas, tuaj yeem ua tsis tiav los yog tsiv teb tsaws, ua rau txo qis hauv cov khoom siv. Vim nws txoj kev ruaj ntseg zoo heev thiab siv cov khoom siv tsawg dua, PP muaj teeb meem tsawg dua hauv qhov no. Txawm li cas los xij, vim yog cov yam ntxwv ntawm nws cov qauv molecular, PS yog ntau duae mus rau oxidative degradation ntawm qhov kub thiab txias thiab yuav tsum tau ntxiv cov stabilizers ntau dua, uas tej zaum yuav tsiv teb tsaws los yog poob ntawm qhov kub thiab txias.

4.5 Kev sib piv ntawm Chemical Stability

Raws li cov khoom noj khoom haus, cov kua ntses feem ntau muaj ntau yam tshuaj lom neeg, nrog rau cov organic acids, ntsev, txuj lom, thiab roj. Cov khoom no tuaj yeem cuam tshuam nrog cov khoom ntim ntawm qhov kub sib txawv. Yog li ntawd, kev ruaj ntseg tshuaj ntawm cov khoom ntim yog ib qho tseem ceeb hauv kev ua kom cov khoom zoo thiab kev nyab xeeb. PP (polypropylene) cov ntaub ntawv nthuav tawm cov tshuaj lom neeg ruaj khov, tshwj xeeb tshaj yog nws cov tshuaj tiv thaiv zoo rau cov kua qaub, cov hauv paus, thiab ntsev. Cov kev tshawb fawb pom tau tias PP tuaj yeem tiv thaiv kev yaig ntawm cov khoom xyaw ntses feem ntau, suav nrog acetic acid, citric acid, ntsev, thiab kua ntses. Cov tshuaj inertness no feem ntau tshwm sim los ntawm PP lub saturated carbon saw qauv thiab tsis yog -polar yam ntxwv, ua rau nws tsis tshua muaj kev cuam tshuam nrog polar tshuaj.

Hauv kev siv cov tswv yim, PP ntim tuaj yeem khaws cov kua ntses uas muaj ntau yam seasonings rau ncua sij hawm yam tsis muaj kev hloov pauv kev ua haujlwm lossis kev txav chaw. PP cov ntaub ntawv qhia tau zoo heev, tshwj xeeb tshaj yog rau cov kua ntses uas muaj acidic Cheebtsam xws li ketchup thiab chili sauce. Qhov no ua rau PP cov khoom siv rau ntim cov kua qaub acidic.

PS (polystyrene) cov khoom yog qhov tsis muaj zog ntawm cov tshuaj lom neeg ruaj khov, tshwj xeeb tshaj yog nws tsis zoo rau cov kuab tshuaj organic thiab qee yam tshuaj. PS yog o yooj yim los ntawm cov khoom oily thiab tuaj yeem hloov pauv kev ua haujlwm thaum sib cuag nrog cov roj- muaj cov kua ntses. Tib lub sijhawm, PS yuav muaj kev ntxhov siab tawg thaum raug rau qee yam tshuaj, cuam tshuam rau kev ncaj ncees ntawm lub thawv.

Nws yog ib qho tseem ceeb tshwj xeeb uas PS yuav muaj kev cuam tshuam kev tsiv teb tsaws thaum sib cuag nrog qee cov khoom xyaw ntses. Cov kev tshawb fawb pom tau tias thaum PS ntim cov kua ntses uas muaj cov txuj lom lossis cov kuab tshuaj organic, cov tshuaj tsw qab yuav txav mus rau hauv lub thawv, cuam tshuam rau cov khoom qab zib. Ib txhij, qee cov khoom hauv PS kuj tuaj yeem txav mus rau hauv cov zaub mov, cuam tshuam rau kev nyab xeeb ntawm zaub mov.