Kev piav qhia luv luv ntawm kev siv cov kev paub txog PVC impact modifiers

(1) CPE

Chlorinated polyethylene (CPE) yog cov khoom hmoov uas tau los ntawm kev chlorination ntawm HDPE hauv cov dej. Nrog rau qhov nce ntawm chlorination degree, thawj crystalline HDPE maj mam dhau los ua amorphous elastomer. CPE siv ua tus neeg sawv cev toughening feem ntau muaj cov ntsiab lus chlorine ntawm 25-45%. CPE muaj ntau qhov chaw thiab tus nqi qis. Ntxiv rau nws cov nyhuv toughening, nws kuj muaj kev tiv thaiv txias, tiv thaiv huab cua, tiv thaiv hluav taws, thiab tiv thaiv tshuaj lom neeg. Tam sim no, CPE yog tus hloov pauv tseem ceeb hauv Suav teb, tshwj xeeb tshaj yog hauv kev tsim cov kav dej PVC thiab cov profile, thiab feem ntau cov Hoobkas siv CPE. Tus nqi ntxiv feem ntau yog 5-15 feem. CPE tuaj yeem siv ua ke nrog lwm cov neeg sawv cev toughening, xws li roj hmab thiab EVA, kom ua tiav cov txiaj ntsig zoo dua, tab sis cov roj hmab ntxiv tsis tiv taus kev laus.

(2) ACR

ACR yog ib qho copolymer ntawm monomers xws li methyl methacrylate thiab acrylic ester. Nws yog qhov zoo tshaj plaws impact modifier tsim nyob rau hauv xyoo tas los no thiab tuaj yeem ua rau lub zog cuam tshuam ntawm cov ntaub ntawv los ntawm ntau kaum npaug. ACR yog ib qho impact modifier ntawm lub plhaub-core qauv, muaj ib lub plhaub ua los ntawm methyl methacrylate ethyl acrylate polymer, thiab ib lub roj hmab elastomer tsim los ntawm kev sib txuas nrog butyl acrylate ua lub plawv saw ntu faib rau hauv txheej sab hauv ntawm cov khoom me me. Tshwj xeeb tshaj yog haum rau kev hloov kho qhov cuam tshuam ntawm PVC yas khoom rau kev siv sab nraum zoov, siv ACR ua impact modifier hauv PVC yas qhov rooj thiab qhov rai profiles muaj cov yam ntxwv ntawm kev ua tau zoo, du nto, zoo laus tsis kam, thiab siab vuam ces kaum piv rau lwm cov modifiers, tab sis tus nqi yog li ib feem peb siab dua CPE.

(3) MBS

MBS yog ib qho copolymer ntawm peb lub monomers: methyl methacrylate, butadiene, thiab styrene. Qhov solubility parameter ntawm MBS yog nruab nrab ntawm 94 thiab 9.5, uas ze rau qhov solubility parameter ntawm PVC. Yog li ntawd, nws muaj kev sib raug zoo nrog PVC. Nws qhov tshwj xeeb tshaj plaws yog tias tom qab ntxiv PVC, nws tuaj yeem ua rau cov khoom pob tshab. Feem ntau, ntxiv 10-17 qhov rau PVC tuaj yeem ua rau nws lub zog cuam tshuam los ntawm 6-15 zaug. Txawm li cas los xij, thaum qhov ntau ntawm MBS ntxiv ntau dua 30 qhov, lub zog cuam tshuam ntawm PVC yeej txo qis. MBS nws tus kheej muaj kev ua tau zoo cuam tshuam, pob tshab zoo, thiab kev xa mus ntau dua 90%. Thaum txhim kho kev ua tau zoo cuam tshuam, nws muaj me ntsis cuam tshuam rau lwm yam khoom ntawm cov resin, xws li lub zog tensile thiab elongation thaum tawg. MBS kim heev thiab feem ntau siv ua ke nrog lwm cov kev hloov pauv cuam tshuam xws li EAV, CPE, SBS, thiab lwm yam. MBS muaj kev tiv thaiv cua sov tsis zoo thiab tiv thaiv huab cua, ua rau nws tsis haum rau kev siv sab nraum zoov ntev. Feem ntau nws tsis yog siv los ua qhov hloov pauv hauv kev tsim cov qhov rooj yas thiab cov qhov rai profile.

(4) SBS

SBS yog ib qho ternary block copolymer ntawm styrene, butadiene, thiab styrene, tseem hu ua thermoplastic styrene butadiene roj hmab. Nws yog ib feem ntawm thermoplastic elastomers thiab nws cov qauv tuaj yeem muab faib ua ob hom: lub hnub qub zoo li thiab kab. Qhov piv ntawm styrene rau butadiene hauv SBS yog feem ntau 30/70, 40/60, 28/72, thiab 48/52. Feem ntau siv ua tus hloov pauv rau HDPE, PP, thiab PS, nrog rau qhov ntau ntawm 5-15 qhov. Lub luag haujlwm tseem ceeb ntawm SBS yog los txhim kho nws qhov kev tiv thaiv kev cuam tshuam qis-kub. SBS muaj kev tiv thaiv huab cua tsis zoo thiab tsis haum rau cov khoom siv sab nraum zoov ntev.

(5) ABS

ABS yog ib qho ternary copolymer ntawm styrene (40% -50%), butadiene (25% -30%), thiab acrylonitrile (25% -30%), feem ntau yog siv ua cov yas engineering thiab kuj siv rau kev hloov kho qhov cuam tshuam PVC, nrog rau kev hloov kho qhov cuam tshuam zoo hauv qhov kub qis. Thaum qhov ntau ntawm ABS ntxiv mus txog 50 qhov, lub zog cuam tshuam ntawm PVC tuaj yeem sib npaug rau ABS ntshiab. Qhov ntau ntawm ABS ntxiv yog feem ntau 5-20 qhov. ABS muaj kev tiv thaiv huab cua tsis zoo thiab tsis haum rau kev siv sab nraum zoov ntev hauv cov khoom. Feem ntau nws tsis siv ua tus hloov kho qhov cuam tshuam hauv kev tsim cov qhov rooj yas thiab qhov rai profile.

(6) EVA

EVA yog ib qho copolymer ntawm ethylene thiab vinyl acetate, thiab kev qhia txog vinyl acetate hloov pauv qhov crystallinity ntawm polyethylene. Cov ntsiab lus ntawm vinyl acetate yog qhov sib txawv heev, thiab qhov refractive index ntawm EVA thiab PVC yog qhov sib txawv, ua rau nws nyuaj rau tau txais cov khoom pob tshab. Yog li ntawd, EVA feem ntau siv ua ke nrog lwm cov resins tiv taus kev cuam tshuam. Tus nqi ntawm EVA ntxiv yog tsawg dua 10 qhov.