Txoj kev npaj ua kom zoo dua ntxiv rau calcium carbonate reinforced modified polyethylene PE

Polyethylene (PE) yog ib qho ntawm cov yas uas tau nyiam mloog tshaj plaws hauv kev tsim khoom lag luam. Nws muaj qhov zoo ntawm kev tiv taus kub qis zoo heev, tiv taus feem ntau cov kua qaub thiab alkali corrosion, ruaj khov tshuaj lom neeg zoo, pwm sai thiab ua haujlwm tau zoo. Nws yog dav siv hauv kev ntim khoom, cov ntaub ntawv tsim kho, tsheb, biology thiab lwm yam teb. Txawm li cas los xij, nws daim ntawv thov ntxiv yog txwv los ntawm nws qhov tsis zoo xws li kev tiv taus kub tsis zoo thiab cov khoom siv kho tshuab qis.

Ultrafine CaCO3 muaj qhov me me thiab qhov sib kis zoo. Nws muaj qhov zoo ntawm kev txo cov qhov hws thiab qhov khoob hauv cov yas thiab ua rau cov yas ntsws ntau dua. Nws tau sau nrog polyethylene, polystyrene, polyvinyl chloride, thiab polypropylene. Ntawm lwm cov yas, nws tuaj yeem txhim kho qhov nyuaj, qhov ntev ruaj khov thiab kev nruj ntawm cov khoom yas.

Txawm li cas los xij, ntau txoj kev tshawb fawb tau qhia tias tsuas yog siv calcium carbonate lossis lwm yam khoom siv los sau cov polymers hloov kho lossis hloov kho lwm yam khoom siv feem ntau tsis ua tiav cov txiaj ntsig zoo tshaj plaws, thiab kev txhim kho kev ua tau zoo yog qhov yooj yim heev. Kev hloov kho sib xyaw ntawm ntau yam hmoov av uas tsis yog hlau feem ntau muaj cov txiaj ntsig zoo dua thiab tuaj yeem txhim kho kev ua tau zoo ntawm cov ntaub ntawv. Tam sim no muaj ntau thiab ntau daim ntawv thov kev tshawb fawb.

Kev tshawb fawb los ntawm Yang Changyou thiab lwm tus tau qhia tias nano-CaCO3 tuaj yeem txhim kho qhov sib xws thiab thermal stability ntawm cov ntaub ntawv polyethylene composite, thiab bagasse fiber (BF) tuaj yeem txhim kho crystallinity thiab toughness ntawm cov ntaub ntawv composite. Ob qho tib si tuaj yeem txhim kho cov khoom siv kho tshuab thiab mechanics ntawm cov ntaub ntawv composite. kev ua tau zoo.

01 Kev faib tawm ntawm polyethylene PE

PE raug muab faib raws li nws cov qauv tshuaj, qhov hnyav molecular thiab txoj kev polymerization. Nws tuaj yeem muab faib ua peb pawg: polyethylene qis density (LDPE), polyethylene siab density (HDPE) thiab polyethylene qis density (LLDPE).

▷Polyethylene uas tsis ntom ntom

LDPE muaj qhov sib txawv ntawm qhov hnyav molecular, crystallinity qis, thiab rhiab rau shear thinning tus cwj pwm. Nws tuaj yeem tsim kev nyuaj siab thaum lub sijhawm molding, yog li LDPE muaj cov khoom zoo optical thiab processability. Vim tias Young's modulus ntawm thaj chaw crystalline siab dua li thaj chaw amorphous, qhov rigidity thiab tensile zog ntawm LDPE qis dua, tab sis qhov toughness thiab elongation ntawm break siab dua.
LDPE feem ntau yog siv rau hauv cov hnab yas ntim khoom, cov yeeb yaj kiab ua liaj ua teb, cov khoom txhaj tshuaj pwm, thiab lwm yam.

▷Cov polyethylene uas muaj zog heev

HDPE yeeb nkab extrusion kab muaj kev tawv, kev ruaj khov, thiab cov khoom siv kho tshuab siab, tab sis nws yooj yim rau kev laus thiab deform, thiab nws qhov nyuaj ntawm qhov chaw qis. HDPE tuaj yeem siv rau hauv cov kav dej, kev txhaj tshuaj molding, tshuab molding, nuv ntses nets, hlua, zaj duab xis ntim khoom thiab lwm yam khoom. HDPE muaj kev rwb thaiv tsev zoo thiab tuaj yeem siv ua cov ntaub qhwv rau cov xov hlau thiab cov cables, nrog rau qee cov khoom siv hauv tsev.

▷Cov polyethylene uas tsis muaj zog ntau

LLDPE yog ib hom polyethylene tshiab uas tau tsim tshiab thiab tsim kho sai heev nyob rau xyoo tas los no. Nws yog ib qho copolymer ntawm ethylene thiab olefin. Piv nrog cov polyethylene qis-density, linear qis-density polyethylene muaj cov tsos zoo sib xws, qhov ci ntsa iab zoo, zoo dua qhov kub qis tsis kam, tab sis tsis pom tseeb. LLDPE tam sim no nkag mus rau hauv yuav luag txhua lub khw polyethylene ib txwm muaj, suav nrog zaj duab xis, molding, yeeb nkab thiab hlau thiab cable.

02 Kev hloov kho ntawm polyethylene PE

Cov polyethylene ib leeg muaj cov khoom siv kho tshuab xws li tsis tiv taus kev laus ntawm cua sov, tsis yooj yim tawg thaum kub tsawg, tsis muaj zog, thiab tsis cuam tshuam. Yog li ntawd, kev kho kom zoo yuav tsum tau tsom mus rau.

Tam sim no, kev hloov kho ntawm PE feem ntau suav nrog ob txoj kev hloov kho: kev hloov kho tshuaj lom neeg thiab kev hloov kho lub cev. Hauv kev hloov kho lub cev, kev hloov kho kom zoo dua yog kev sib xyaw lossis cov khoom sib xyaw ua ke uas npaj los ntawm kev ntxiv cov khoom hloov kho rau polyethylene thiab sib tov kom txhim kho qee yam khoom ntawm polyethylene lossis muab cov khoom tshiab rau polyethylene.

Tam sim no feem ntau siv cov khoom siv inorganic fillers feem ntau suav nrog calcium carbonate, quartz hmoov, ntoo hmoov fiber, mov straw / qab zib cane fiber, silica, whiskers, iav fiber, kaolin, iav hlaws dai, talc, graphite, carbon nanotubes, thiab lwm yam. Los ntawm kev ntxiv hom reinforcing filler no rau polyethylene, cov nqi tuaj yeem txo qis thiab qhov rigidity, lub zog, dimensional stability, kub resistance, magnetism, conductivity thiab lwm yam khoom ntawm cov khoom tuaj yeem txhim kho.

Tshawb nrhiav nws lub hauv paus ntsiab lus, cov khoom inorganic muaj kev tiv taus cua sov thiab lub zog siab, thiab cov khoom inorganic muaj kev cuam tshuam loj heev rau cov txheej txheem crystallization ntawm polyethylene. Raws li cov neeg sawv cev inorganic nucleating, lawv tuaj yeem cuam tshuam ncaj qha rau lub zog, kev tawv thiab kev tiv taus cua sov ntawm polyethylene resin thiab lwm yam cim tseem ceeb.

03 Calcium carbonate hloov kho

Calcium carbonate, ua ib qho khoom siv inorganic filler uas siv tau ntau yam, muaj ob qhov tsis zoo thaum siv nrog cov ntaub ntawv polymer:

Ntawm ib sab tes, qhov saum npoo yog hydrophilic thiab oleophobic, nrog polarity muaj zog, tsis zoo li hydrophobic thiab oleophilic qis polarity ntawm lub cev organic, nws nyuaj rau ua ke nrog cov polymer matrix;

Ntawm qhov tod tes, calcium carbonate muaj lub zog tsis zoo nrog cov polymers thiab tsuas yog ua lub luag haujlwm yaj. Calcium carbonate ntau dhau yuav ua rau kev ua haujlwm ntawm cov khoom siv polymer poob qis, ua rau nws nyuaj rau tsim thiab ua cov khoom.

Hauv kev siv tiag tiag, yuav tsum muaj kev sib txuas zoo ntawm calcium carbonate thiab polyethylene, thiab qhov loj ntawm calcium carbonate yuav tsum me me thiab qhov dispersibility yuav tsum zoo. Yog li ntawd, calcium carbonate yuav tsum tau hloov kho.

Calcium carbonate raug hloov kho nrog titanate coupling agent. Cov alkyl moiety hauv coupling agent yooj yim rau hydrolyze thiab sib xyaw nrog -OH ntawm qhov chaw ntawm calcium carbonate thaum lub sijhawm hloov kho, uas tuaj yeem ua rau qhov khoom ntawm calcium carbonate ua hydrophobic; Peb lub qauv tuaj yeem sib xyaw lossis sib xyaw nrog cov polymer, yog li txhim kho qhov sib xws ntawm calcium carbonate thiab polymer thiab rheology thiab dispersion stability ntawm calcium carbonate hauv lub cev, yog li txhim kho cov khoom siv kho tshuab thiab cov khoom siv kho tshuab.

Txoj cai hloov kho ntawm tus neeg sawv cev titanate coupling

04 Cov hmoov tsis muaj organic uas tau hloov kho polyethylene

Zuo Yinze et al. siv cov tshuaj titanate coupling agent (KH101) thiab silane coupling agent (KH570) los hloov CaCO3 thiab SiO2 ua cov khoom sau, thiab ua cov khoom siv binary thiab ternary PE composite nrog HDPE ua lub matrix. Kev tshawb fawb qhia tau tias: kev sib cais ntawm cov nanoparticles hloov kho hauv lub matrix tau zoo dua, qhov xwm txheej agglomeration txo qis, thiab lub zog tensile thiab lub zog cuam tshuam ntawm cov khoom siv binary nce ua ntej thiab tom qab ntawd txo qis nrog kev nce ntawm CaCO3 thiab SiO2 cov ntsiab lus. Thaum tus nqi doping ntawm SiO2 yog 7wt%, kev ua tau zoo ntawm cov khoom siv PE / SiO2 composite yog qhov zoo tshaj plaws; Thaum cov CaCO3 doping ntau npaum li cas yog 15wt%, qhov kev ua tau zoo ntawm cov khoom siv PE/CaCO3 composite yog qhov zoo tshaj plaws. Hauv cov khoom siv PE/CaCO3/SiO2 composite, thaum cov calcium carbonate thiab SiO2 doping ntau npaum li cas yog 25wt% thiab 7wt%, lub zog tensile thiab lub zog cuam tshuam notched nce ntxiv 17.6% thiab 34.5% feem, ua kom muaj kev cuam tshuam synergistic thiab ua tiav cov txiaj ntsig zoo dua. Kev ua tau zoo tag nrho.

Zhou Lin thiab lwm tus tau tsim cov khoom siv sib xyaw ua ke zoo nrog nano-calcium carbonate sib xyaw nrog SBS / HDPE. Cov kev tshawb fawb qhia tau tias: lub zog cuam tshuam, lub zog tensile, thiab elongation thaum tawg ntawm nano-calcium carbonate thiab SBS / high-density polyethylene sib xyaw nce nrog kev nce ntawm nano-calcium carbonate. Cov kev hloov pauv hauv qhov loj me txhua qhov qhia txog kev hloov pauv parabolic nrog qhov qhib downward. Txij li thaum cov khoom cuam tshuam, lub zog tensile, thiab elongation thaum tawg ntawm cov sib xyaw feem ntau hloov pauv synchronously, nws tuaj yeem xaus lus tias nano-calcium carbonate tuaj yeem ua kom tawv thiab txhawb cov sib xyaw. Kev ua tau zoo tag nrho ntawm cov sib xyaw yog qhov zoo tshaj plaws thaum qhov loj me ntawm nano-calcium carbonate ncav cuag 15% ntawm tag nrho cov pawg ntawm cov sib xyaw.

Zhang Xiaoqian thiab lwm tus tau muab cov hmoov ntoo thiab HDPE sib xyaw ua ke rau hauv cov feem sib txawv ntawm CaCO3 whiskers los npaj cov khoom siv CaCO3/HDPE/ntoo hmoov sib xyaw. Lawv txoj kev tshawb fawb qhia tau tias thaum cov khoom siv CaCO3 doping yog 7%, lub zog tensile ncav cuag qhov siab tshaj plaws ntawm 28.3MPa. Piv nrog cov khoom siv HDPE/ntoo hmoov sib xyaw (19.7MPa), nws nce ntxiv 43.7%, thaum lub zog khoov thiab cuam tshuam nce ntxiv 19.2% thiab 20.1%.