Cov ntsiab lus ntawm daim ntawv thov kev paub txog PVC cuam tshuam kev hloov pauv

(1) CPE

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

(2) ACR

ACR yog copolymer ntawm monomers xws li methyl methacrylate thiab acrylic ester. Nws yog qhov kev hloov pauv zoo tshaj plaws uas tsim nyob rau xyoo tas los no thiab tuaj yeem ua rau muaj zog ntawm cov khoom siv los ntawm ntau kaum lub sijhawm. ACR belongs rau cov kev hloov pauv ntawm cov tub ntxhais-plhaub qauv, muaj ib lub plhaub uas muaj methyl methacrylate ethyl acrylate polymer, thiab cov roj hmab elastomer tsim los ntawm crosslinking nrog butyl acrylate raws li cov tub ntxhais saw ntu faib rau hauv txheej txheej ntawm cov khoom. Tshwj xeeb tshaj yog tsim nyog rau kev hloov pauv ntawm PVC yas khoom siv rau sab nraum zoov, siv ACR los ua ib qho kev hloov pauv hauv PVC yas qhov rooj thiab qhov rais profiles muaj cov yam ntxwv ntawm kev ua tau zoo, du nto, zoo aging kuj, thiab siab vuam kaum lub zog piv rau lwm yam kev hloov kho. , tab sis tus nqi yog kwv yees li ib feem peb siab dua CPE.

(3) MBS

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

(4) SBS

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

(5) ABS

ABS yog ternary copolymer ntawm styrene (40% -50%), butadiene (25% -30%), thiab acrylonitrile (25% -30%), feem ntau yog siv los ua engineering plastics thiab kuj siv rau PVC cuam tshuam kev hloov kho, nrog zoo tsawg. -temperature impact modification cuam tshuam. Thaum tus nqi ntawm ABS ntxiv mus txog 50 qhov chaw, qhov cuam tshuam lub zog ntawm PVC tuaj yeem sib npaug ntawm ABS ntshiab. Tus nqi ntawm ABS ntxiv yog feem ntau 5-20 ntu. ABS muaj cov huab cua tsis zoo thiab tsis haum rau kev siv sab nraum zoov mus ntev hauv cov khoom. Nws feem ntau tsis yog siv los ua ib qho kev hloov pauv hauv kev tsim cov yas qhov rooj thiab qhov rais profiles.

(6) EVA

EVA yog copolymer ntawm ethylene thiab vinyl acetate, thiab kev taw qhia ntawm vinyl acetate hloov cov crystallinity ntawm polyethylene. Cov ntsiab lus ntawm vinyl acetate yog qhov sib txawv, thiab qhov ntsuas qhov ntsuas ntawm EVA thiab PVC yog qhov sib txawv, ua rau nws nyuaj kom tau txais cov khoom pob tshab. Yog li ntawd, EVA feem ntau siv ua ke nrog lwm yam kev cuam tshuam resistant resins. Tus nqi ntawm EVA ntxiv yog tsawg dua 10 feem.