Kawm txog Polyethylene Powder Coatings for Battery Boxes

Abstract

Muaj rau hom tshuaj polyethylene hmoov rau cov thawv roj teeb los ntawm kev sib xyaw ua ke ntawm polyethylene nrog cov yam ntxwv sib txawv. Los ntawm kev sim cov dej ntws, cov khoom siv kho tshuab, thiab kev tiv thaiv acid ntawm cov zaj duab xis txheej ntawm cov tshuaj polyethylene hmoov txheej tau los ntawm cov txheej txheem sib xyaw sib txawv, cov mis ntawm polyethylene hmoov txheej nrog kev ua tau zoo tshaj plaws tau raug tshuaj xyuas. Cov tshuaj polyethylene hmoov txheej uas tau npaj tseg tuaj yeem ua tau raws li qhov xav tau ntawm cov thawv roj teeb, thiab tib lub sijhawm muaj cov khoom siv kho tshuab zoo heev thiab kev tiv thaiv tshuaj lom neeg, uas tuaj yeem txhim kho lub neej ua haujlwm ntawm cov thawv roj teeb.

keywords

Roj teeb lub thawv; Polyethylene; Kev sib xyaw; Hmoov txheej
Kev faib tawm Code: TQ637.82
Cov Ntaub Ntawv Code: A

1 Introduction

Nrog rau cov kev cai nruj zuj zus ntxiv rau kev tiv thaiv ib puag ncig, tswj cov pa pa tawm thiab txo cov pa phem tau dhau los ua qhov tseem ceeb ntawm kev tiv thaiv ib puag ncig [1].

Cov tsheb roj tsheb feem ntau siv cov fossil fuels los ua lub zog siv hluav taws xob, thiab lawv qhov teeb meem loj tshaj plaws yog qhov emission ntawm cov pa roj ntau ntau, uas ua rau ib puag ncig hnyav. Piv txwv li, lub zog tshiab tsheb uas siv cov roj teeb cia li lub zog traction tsis tsim cov pa tawm thiab ua rau tsis muaj kuab paug rau huab cua, yog li lawv tau nyiam los ntawm kev ua lag luam [2].

Thaum lub sij hawm kev pab cuam lub neej ntawm industrial roj teeb thawv, lawv eroded los ntawm roj teeb acid, uas accelerates lub corrosion thiab tsis ua hauj lwm ntawm lub thawv. Yog li ntawd, kev tiv thaiv corrosion ntawm lub thawv roj teeb yeej ib txwm yog ib qho kev tshawb fawb kub. Lub thawv roj teeb muaj feem ntau yog ua los ntawm cov hlau, uas nws tus kheej tsis muaj kev tiv thaiv corrosion zoo [3].

Yog li ntawd, tsuas yog los ntawm kev kho qhov chaw ntawm cov phab ntsa sab hauv thiab sab nrauv ntawm lub thawv tuaj yeem txhim kho lawv cov kev tiv thaiv corrosion zoo. Ib qho kev siv tshuab kev kho mob feem ntau yog siv txheej txheej los tiv thaiv corrosion ntawm lub thawv nto, thiab cov txheej yuav tsum tsis yog tsuas yog tiv taus cov kua qaub yaig tab sis kuj ua raws li cov substrate.

Cov txheej txheej hmoov polyethylene feem ntau muaj cov polyethylene resin, cov khoom ntxiv, cov khoom sau, cov xim, thiab lwm yam. Lawv yog cov txheej txheej hmoov thermoplastic uas tiv taus tshuaj lom neeg zoo heev thiab siv nyiaj tsawg.

Xav txog cov kev cai tiv thaiv corrosion ntawm lub thawv roj teeb, nrog rau cov kev xav tau ntawm cov tsos thiab cov nqi, polyethylene hmoov txheej yog ib qho kev lag luam uas muaj peev xwm tiv thaiv corrosion txheej. Txawm li cas los xij, muaj qhov tsis sib xws ntawm cov khoom siv kho tshuab thiab fluidity ntawm polyethylene. Polyethylene hmoov txheej feem ntau nyuaj kom muaj ob qho tib si zoo heev thiab cov khoom siv kho tshuab, yog li lawv yuav tsum tau hloov kho kom tau raws li cov txheej txheem txheej txheem ntawm cov thawv roj teeb. Hauv txoj kev tshawb no, los ntawm kev sib xyaw hloov pauv ntawm polyethylene nrog cov khoom sib txawv, polyethylene hmoov txheej rau lub thawv roj teeb tau tsim. Cov txheej no muaj cov khoom siv zoo heev, tshuaj lom neeg tsis kam, siab adhesion, thiab zoo nto leveling.

2 Tshooj Kev sim

2.1 Kev sim cov khoom siv raw thiab cov cuab yeej

2.1.1 Cov Khoom Siv Raw

• Polyethylene (PE-A, PE-B, PE-C): Sinopec;
• Polyethylene (PE-D): Dow Tshuaj;
• Polyethylene (PE-E): Prime Polymer Co., Ltd., Nyiv;
• Polyethylene nplaum (MAH-g-PE): Qauv SZ-07, Huangshan Beno Technology;
• Antioxidant: Qauv K7001, Luan JIENT;
• Lub teeb stabilizer: Qauv UV531, BASF;
• Polyethylene wax flow agent: Shanghai Additive Factory;
• Nucleating tus neeg sawv cev: Qauv Hyperform HPN-20E, Milliken Chemical, Tebchaws USA;
• Pigment carbon dub: Qauv R600R, Cabot.

2.1.2 Seev

• Twin-ntsia hlau extruder: Qauv T-35, Nanjing Rub Tshuab, Ltd.;
• Phaj vulcanizing tshuab: Model XLB-D, Huzhou Shyn Machinery Co., Ltd.;
• Environmental stress cracking tester: Model NYK-06, ChengdeTesting Equipment Co., Ltd.;
• Universal xeem tshuab rau yas: Model WDS-3, Boyi InstruEquipment Co., Ltd.

2.2 Cov txheej txheem sim

2.2.1 Kev npaj cov hmoov txheej

Cov ntaub ntawv nyoos tau raug ntsuas raws li cov qauv hauv Table 1 thiab ntxiv rau lub tshuab tov rau kev sib xyaw ua haujlwm siab. Tom qab ntawd cov khoom sib tov tau muab tso rau hauv ib lub ntxaib-ntsia hlau extruder rau yaj extrusion granulation ntawm 160 ° C. Cov granules tau muab tso rau hauv ib lub zeb kom crushed rau hauv hmoov, ua raws li kev faib thiab sieving.

Table 1 Formula ntawm Polyethylene Powder Txheej

2.2.2 Kev npaj cov txheej txheem

Ib txoj kev siv lub txaj fluidized dipping los npaj cov hmoov polyethylene coatings rau ntawm qhov chaw ntawm cov thawv roj teeb. Ua ntej, qhov chaw ntawm lub thawv roj teeb tau raug xuab zeb, tom qab ntawd cua sov rau 250-350 ° C hauv qhov cub. Tom qab ntawd, cov hmoov polyethylene coating tau siv los ntawm kev siv lub txaj fluidized dipping, thiab plasticization tau ua tiav siv cov cua sov seem ntawm cov khoom ua haujlwm lossis los ntawm kev muab tso rau hauv qhov cub.

2.2.3 Kev Npaj Cov Qauv rau Kev Ntsuas Kev Ua Haujlwm

Cov qauv rau kev sim cov khoom siv ntawm polyethylene hmoov tau npaj los ntawm compression molding.

2.3 Kev Ntsuas Kev Ua Haujlwm

• Lub yaj ntws tus nqi (MFR) ntawm polyethylene hmoov txheej raug kuaj raws li GB / T 3682-2018;
• Ib puag ncig kev ntxhov siab tawg (ESC) kev ua tau zoo ntawm polyethylene hmoov txheej raug kuaj raws li GB / T 1842-2008;
• Cov khoom tensile ntawm polyethylene hmoov txheej raug kuaj raws li GB / T 1040.2-2018;
• Cov kua qaub tiv thaiv ntawm polyethylene hmoov txheej tau sim siv 30% (cov feem ntau) sulfuric acid tov raws li GB / T 11547-2008;
• Cov adhesion ntawm polyethylene hmoov txheej raug kuaj raws li GB / T 9286-2008.

Cov kev qhia tseem ceeb ntawm polyethylene hmoov txheej rau lub thawv roj teeb tau qhia hauv Table 2.

Table 2 Main Performance Indicators of Polyethylene Coatings for Battery Boxes

3 Cov txiaj ntsig thiab kev sib tham

3.1 Kev Ntsuam Xyuas Kev Ua Haujlwm ntawm Polyethylene

Kev tshuaj xyuas qhov kev ua tau zoo ntawm ntau hom polyethylene yog qhov yuav tsum tau ua ua ntej rau kev tsim cov qauv ntawm cov khoom sib xyaw polyethylene hmoov txheej. Hauv txoj kev tshawb no, 5 ntau hom polyethylene raug xaiv los ua cov khoom siv raw rau cov hmoov txheej, thiab lawv cov khoom raug kuaj raws li cov qauv tsim nyog. Cov txiaj ntsig tau pom nyob rau hauv Table 3.

Raws li tuaj yeem pom los ntawm Table 3, PE-A thiab PE-B muaj cov dej ntws zoo heev, yog li lawv tuaj yeem ua tau raws li qhov yuav tsum tau ua rau qhov siab ntawm txheej txheej. Txawm li cas los xij, qhov nyuaj ntawm PE-A thiab PE-B yog qhov tsis zoo. Lub elongation ntawm kev tawg ntawm PE-A tsuas yog 100%, thiab nws cov kev ntxhov siab tawg lub sij hawm tsuas yog 1 h, yog li nws tsis tuaj yeem ua tau raws li cov khoom siv ntawm cov khoom siv roj teeb txheej. PE-C yog linear low-density polyethylene nrog rau qhov nruab nrab yaj ntws, uas tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm cov txheej txheem zoo tib yam, tab sis nws cov tawv tawv kuj tsis zoo. Ob leeg PE-D thiab PE-E yog metallocene linear low-density polyethylene, thiab ob qho tib si muaj zog thiab tensile zog. Qhov sib txawv yog tias PE-E muaj qhov ntsuas qis qis qis, uas tsis tuaj yeem ua tau raws li qhov xav tau ntawm txheej txheej txheej.

Table 3 Cov Khoom Ntawm Ntau Hom Polyethylene

3.2 Kev xaiv thiab ua kom zoo ntawm Polyethylene

Lub melt flow rate (MFR) ntawm polyethylene yog ib qho taw qhia qhia txog qhov fluidity ntawm polyethylene nyob rau hauv lub kub-melt lub xeev, thiab nws mus rau ib tug tej yam sawv cev rau lub leveling nyhuv ntawm polyethylene txheej. Feem ntau, qhov siab dua MFR tus nqi, qhov zoo dua cov txheej txheem txheej txheej. Txawm li cas los xij, qhov siab dua tus nqi MFR, qhov qis dua qhov txheeb ze molecular loj ntawm polyethylene feem ntau yog, thiab qhov phem dua nws cov khoom siv kho tshuab. Yog li ntawd, nws yog ib qho nyuaj rau ua tau raws li qhov yuav tsum tau muaj ntawm ob qho tib si fluidity thiab mechanical zog tib lub sij hawm, uas kuj tau txheeb xyuas los ntawm cov txiaj ntsig kev ntsuam xyuas pom nyob rau hauv Table 3. Yog hais tias polyethylene nrog cov khoom sib txawv yog tov thiab siv ua ke los ua kom cov sib tov muaj ob qho tib si zoo heev fluidity thiab mechanical zog, theoretically, polyethylene hmoov coatings nrog cov khoom ua tau raws li qhov yuav tsum tau ua.

Table 4 Txawv Blending Schemes

 Nws tuaj yeem pom los ntawm Table 3 tias ob qho tib si PE-A thiab PE-B muaj cov dej ntws siab, tab sis PE-B muaj qhov hnyav dua, yog li PE-B tuaj yeem siv los ua cov khoom siv matrix los txhim kho fluidity ntawm qhov sib tov; PE-D thiab PE-E muaj cov khoom siv zoo thiab tuaj yeem siv los ua cov ntaub ntawv matrix los txhim kho cov khoom siv sib xyaw ntawm cov khoom sib xyaw. Txawm li cas los xij, PE-E muaj qhov qis qis qis, yog li nws tsis haum raws li cov khoom siv matrix. Rau polyethylene nrog ib tug loj nruab nrab cov txheeb ze molecular mass, xws li PE-E, cov saw entanglement ceev yog siab thiab tus nqi ntws yog tsawg. Txawm li cas los xij, thaum nws raug rau cov khoom siv sab nraud, nws cov txheej txheem tawm los yog feem ntau yog shear deformation, thiab pom tseeb molecular ntws tsis yooj yim tshwm sim, yog li nws muaj zog thiab toughness [6]. Yog li ntawd, PE-B thiab PE-D tau muab sib xyaw rau hauv qhov sib txawv los npaj cov khoom sib xyaw hloov pauv polyethylene. Nyob rau tib lub sijhawm, txhawm rau txhim kho lub zog sib txuas ntawm polyethylene hmoov txheej thiab roj teeb lub thawv substrate, yuav tsum tau ntxiv qhov tsim nyog ntawm polyethylene nplaum (MAH-g-PE) ntxiv. Polyethylene nplaum yog ib daim ntawv uas npaj los ntawm grafting maleic anhydride rau polyethylene. Hauv kev xaus, 6 cov txheej txheem sib xyaw sib txawv tau tsim, raws li qhia hauv Table 4.

3.3 Kev Ntsuam Xyuas Kev Ua Haujlwm ntawm Polyethylene Powder Coatings

Raws li daim duab 1, raws li kev sib xyaw ua ke hauv Table 4, cov khoom siv raw tau muab sib xyaw, extruded, thiab crushed los npaj polyethylene hmoov txheej. Lub yaj ntws tus nqi, tensile zog, kev nyuaj siab tawg tsis kam, thiab acid kuj ntawm hmoov txheej raug kuaj raws li lub teb chaws tus qauv. Cov txiaj ntsig tau pom nyob rau hauv Table 5.

Table 5 Kev Ntsuas Kev Ua Haujlwm ntawm Cov Txheej Txheem Sib Txawv Sib Txawv

Raws li tau pom los ntawm Table 5, cov yaj ntws ntawm qhov sib tov txo qis nrog qhov nce ntawm qhov sib npaug ntawm PE-D. Qhov no feem ntau yog vim hais tias thaum PE-B (nrog qis tus txheeb ze molecular mass) yog tov nrog PE-D (nrog siab txheeb ze molecular loj) thiab yaj-extruded los ntawm ib tug extruder, ntev molecular chains qhwv lub luv luv molecular chains, uas ua rau ib tug ceev ceev ntawm cov melt flow rate. Yog li ntawd, qhov sib ntxiv ntawm polyethylene nrog cov fluidity tsawg muaj kev cuam tshuam zoo rau lub fluidity ntawm qhov sib tov, thiab kev txiav txim siab tshwj xeeb yuav tsum tau muab rau nws cov nyiaj ntxiv thaum tsim cov qauv ntawm cov khoom sib xyaw polyethylene hmoov txheej. Los ntawm lwm qhov kev xav, qhov fluidity ntawm PE-D (polyethylene nrog fluidity tsawg) kuj tuaj yeem txhim kho tau zoo tom qab sib xyaw nrog PE-B (polyethylene nrog fluidity siab). Qhov no yog vim hais tias polyethylene nrog luv luv molecular chains yuav densely ntxig rau hauv polyethylene nrog ntev molecular chains, ua rau nws tsim ib txheej txheej, li no tsis muaj zog cov molecular saw entanglement. Flow modifiers rau high-relative molecular mass polyethylene feem ntau siv txoj cai no los txhim kho fluidity ntawm polyethylene [7].

Nws kuj tseem tuaj yeem pom los ntawm Table 5 tias lub zog tensile thiab elongation ntawm kev tawg ntawm cov khoom sib xyaw polyethylene hmoov txheej maj mam nce nrog qhov nce ntxiv ntawm PE-D, qhia tias kev sib raug zoo ntawm ob hom polyethylene yog qhov zoo. Qhov no feem ntau yog vim qhov enthalpy thiab entropy qhov tseem ceeb ntawm PE-B thiab PE-D zoo sib xws, yog li tsis muaj kev hloov pauv hauv lub zog dawb ntawm kev sib xyaw, thiab kev sib raug zoo ntawm ob hom polyethylene yog siab. Piv nrog Scheme 1, Scheme 6 muaj qhov nce ntxiv ntawm lub zog, qhov elongation ntawm kev tawg yog nce 2 zaug, thiab cov txheej txheej tawv tau zoo dua. Txawm hais tias cov txheej txheej muaj zog thiab tawv tawv tau txhim kho zoo nrog qhov nce ntawm qhov sib ntxiv ntawm PE-D, qhov kev txhim kho yog qis dua li qhov txo qis ntawm cov yaj ntws. Qhov no yog vim hais tias kev koom ua ke ntawm PE-B txo cov molecular saw entanglement ceev ntawm PE-D, ua rau cov saw molecular txaus yuav tshwm sim thaum lub sij hawm ncab, thaum cov nyhuv shearing tsis muaj zog.

Rau cov txheej txheem polyethylene siv rau saum npoo ntawm lub thawv roj teeb, kev ntxhov siab tso tawm los ntawm kev nyiam ntawm cov qauv sab hauv kom stabilize thiab kev ntxhov siab concentration tsim nyob rau hauv kaum cheeb tsam yuav ua rau txheej txheej tawg. Yog li ntawd, kev nyuaj siab cracking kuj yog ib qho tseem ceeb qauv los ntsuas lub neej kev pab cuam ntawm txheej. Nws tuaj yeem pom los ntawm qhov kev ntsuam xyuas ib puag ncig kev ntxhov siab hauv Table 5 tias qhov kev ntxhov siab tawg tsis kam ntawm polyethylene hmoov txheej yog zoo ib yam nrog nws cov toughness, uas yog, ntau dua cov txheej toughness, qhov zoo dua qhov kev ntxhov siab tawg. PE-D tuaj yeem txhim kho qhov kev ntxhov siab tawg ua haujlwm ntawm cov khoom sib xyaw polyethylene hmoov txheej.

Polyethylene hmoov txheej rau lub thawv roj teeb yog txuas ntxiv corroded los ntawm roj teeb acid, yog li nws yuav tsum muaj kev ua haujlwm zoo los tiv thaiv corrosion. Nws tuaj yeem pom los ntawm kev ntsuas cov kua qaub nyob hauv Table 5 tias tom qab cov tshuaj polyethylene hmoov txheej npaj los ntawm Scheme 1 yog raus hauv cov kua qaub, tsis muaj npuas lossis tawg, tab sis qhov mob hnyav tshwm sim, thiab cov txheej txheej adhesion tsuas yog 5; piv nrog Scheme 1, txheej txheej npaj los ntawm Scheme 2 muaj qhov o me me tom qab raug corroded los ntawm cov kua qaub, thiab cov adhesion mus txog qib 3; Cov txheej txheej polyethylene npaj los ntawm lwm cov tswv yim tsis muaj qhov pom tseeb corrosion tshwm sim, thiab cov txheej txheem adhesion tuaj yeem ncav cuag qib 1. Metallocene PE-D nws tus kheej muaj cov tshuaj tiv thaiv zoo heev, yog li nrog qhov sib ntxiv ntawm nws cov nyiaj ntxiv, kev tiv thaiv corrosion ntawm cov txheej yog maj mam txhim kho.

Los ntawm kev ntsuas kev ua tau zoo ntawm polyethylene hmoov txheej nrog cov qauv sib txawv uas tau tsim los saum toj no, cov txiaj ntsig tau pom tias polyethylene hmoov txheej npaj los ntawm Scheme 3 thiab Scheme 4 tsis tsuas yog muaj cov dej ntws zoo xwb, tab sis kuj muaj cov khoom siv zoo heev thiab kev ua haujlwm tiv thaiv corrosion, uas tuaj yeem ua tau raws li cov kev xav tau ntawm cov hmoov txheej rau cov thawv roj teeb. Feem ntau, qhov siab dua qhov dej ntws ntawm polyethylene hmoov txheej, qhov zoo dua qhov kev ua tau zoo thiab qhov smoother ntawm txheej txheej. Thaum cov dej ntws ntawm cov khoom siv feem ntau siv polyethylene hmoov txheej yog siab dua 10 g / (10 min), nws tuaj yeem ua tau raws li qhov yuav tsum tau ua kom siab dua. Txawm li cas los xij, cov dej ntws ntawm Scheme 5 thiab Scheme 6 yog qis dua 10 g / (10 min), yog li lawv tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua. Txawm hais tias Scheme 1 muaj qhov sib txawv ntawm cov dej ntws zoo heev, nws lub zog thiab lub zog tsis zoo, thiab nws ua tsis tau cov kua qaub tiv thaiv; Scheme 2 tsis muaj kev txhim kho hauv cov cuab yeej cuab tam, thiab qhov adhesion txo qis tom qab cov kua qaub immersion, yog li nws tuaj yeem siv rau cov xwm txheej uas yuav tsum tau muaj txheej txheej siab, tab sis cov khoom siv tsis tshua muaj thiab cov kev xav tau los tiv thaiv corrosion.

4 Xaus

Hauv txoj kev tshawb no, los ntawm kev sib xyaw thiab siv polyethylene nrog cov khoom sib txawv, kev sib xyaw sib txawv hloov kho polyethylene hmoov txheej txheej txheem tau tsim, thiab kev ua tau zoo ntawm cov txheej txheem sib txawv tau sim. Cov txiaj ntsig tau pom tias polyethylene hmoov txheej tsim raws li Scheme 3 thiab Scheme 4 tuaj yeem ua tsis tau tsuas yog ua tau raws li qhov yuav tsum tau ua ntawm cov txheej txheem ntawm lub roj teeb lub thawv tiv thaiv txheej, tab sis kuj muaj cov khoom siv zoo thiab kev tiv thaiv corrosion. Cov txiaj ntsig kev tshawb fawb tau ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv kev tiv thaiv corrosion ntawm lub thawv roj teeb, thiab cov tswv yim kev tshawb fawb muaj cov lus qhia tseem ceeb rau kev hloov kho cov qauv ntawm polyethylene hmoov txheej.

References

[1] Ji Y. Cov hmoov txheej hauv tsev lag luam loj hlob sai [J]. Cov Ntaub Ntawv Kev Lag Luam Hauv Tsev, 2003(10): 17.

[2] Li Z R. Kev tsom xam luv luv ntawm qhov xwm txheej thiab kev tawm tsam ntawm kev txhim kho lub zog tshiab [J]. Automobile World, 2020(4): 1.

[3] Lu J Q. Anti-corrosion technology ntawm industrial roj teeb thawv [J]. Shipbuilding Technology, 2001(4): 27-28.

[4] Yu GL, Wang ZH, Wang XK, et al. Cov kev tshawb fawb tshiab kawg ntawm cov txheej txheem tshiab [J]. Txheej thiab Tiv Thaiv, 2019, 40(10): 49-52.

[5] Liu CQ, Cai YM. Kev tshawb fawb ntawm cov khoom zoo polyethylene hmoov txheej [J]. Txheej Technology, 1993(2): 4-7.

[6] Liao HY, Tao G. Polymer Materials Science thiab Engineering, 2013, 29(7): 72-75, 79.

[7] Wang WS, Chen YJ, et al. Kev tshawb nrhiav kev nce qib hauv kev hloov pauv hloov pauv ntawm ultra-high molecular hnyav polyethylene cab kuj [J]. Engineering Plastics Application, 2014(10): 113-117.

Lwm yam Posts:

Thermoplastic Powder rau lub thawv roj teeb