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Tus Qauv Txheej Txheem Ntawm Kev Kho Cov Lus Qhia Thib, Hardness, Thiab Gloss Ntawm PE, PP, PVC Cov Khoom

Sijhawm: 2021-06-15 Ntaus: 54

Qhov ntom, hardness, thiab gloss ntawm cov yas tuaj yeem txo lossis nce los ntawm cov txheej txheem tsim nyog los txo lossis ua kom cov yas thawj zaug txheeb ze ntom ntom, ua kom cov tawv tawv los yog ua rau kom yooj, thiab hloov cov gloss kom tau raws li qhov xav tau ntawm kev siv sib txawv.

1. Yuav ua li cas txo qhov ntom ntawm cov yas?
Kev txo cov yas ntom ntom yog hais txog kev txo qis cov yas thawj zaug txheeb ze los ntawm cov txheej txheem tsim nyog kom tau raws li cov kev xav tau sib txawv. Muaj peb txoj hauv kev los txo cov plastics 'density: foaming modification, ntxiv lightweight fillers, thiab blending light resins.

1. Kev hloov pauv ua npuas dej
Kev ua npuas ncauj molding ntawm cov khoom yas yog qhov zoo tshaj plaws los txo nws qhov ntom. Ob txoj kev hloov kho ntawm kev ntxiv cov khoom hnyav ntxiv thiab sib xyaw lub teeb resins tuaj yeem txo qhov ntom me ntsis, thiab qhov txo qis feem ntau tsuas yog kwv yees li 50%. Cov txheeb ze qis tshaj plaws tuaj yeem ncav cuag li 0.5. Lub thickness ntawm cov khoom ua npuas ncauj tuaj yeem sib txawv, thiab cov txheeb ze ntom ntom tuaj yeem tau qis li 10-3. Tam sim no, peb cov khoom niaj hnub PVC ua npuas ncauj muaj xws li PVC ua npuas ncauj board, PVC ua npuas ncauj khau ib leeg, PVC ua npuas ncauj raj, PVC ua npuas ncauj profile, PVC ntoo yas ua npuas ncauj khoom (txav lub qhov rooj vaj huam sib luag, qhov rooj kab, phab ntsa vaj huam sib luag, thiab lwm yam), PVC plaub hau Soak pem teb. mats thiab lwm yam.
2. Ntxiv lub teeb muab tub lim
Xws li PE, PP, CPE, ABS, MBS, xws li ntoo hmoov, hollow iav hlaws, thiab lwm yam.; xws li lub microstructure ntawm microbead fillers, txoj kev no ua rau kom qhov ntom ntom me me. Feem ntau, qhov qis tshaj qhov txheeb ze tuaj yeem txo mus txog 0.4-0.5. Cov txheeb ze ntawm cov muab tub lim yog feem ntau siab dua li ntawm cov yas, thiab tsuas muaj cov nram qab no ntawm cov khoom ntim nrog cov txheeb ze tsawg dua li cov yas. Qhov zoo tshaj plaws yog calcined av nplaum, uas muaj ib tug me me lub ntiajteb txawj nqus tshaj calcium hmoov. Tus nqi tsis txawv npaum li cas ntawm lub teeb calcium, thiab cov roj nqus cov nqi sib npaug ntawm cov hmoov calcium.

1) Beads
● Cov txheeb ze ntom ntom ntawm iav hollow microspheres (floating hlaws) yog 0.4-0.7, feem ntau yog siv rau thermosetting resins;
● Cov txheeb ze ntom ntom ntawm phenolic microbeads yog 0.1.

2) Organic fillers
● Cov txheeb ze ntom ntom ntawm cork hmoov yog 0.5, thiab pom tseeb viscosity yog 0.05-0.06;
● Cov txheeb ze ntawm cov plua plav fiber ntau thiab paj rwb plua plav yog 0.2-0.3;
● Txiv hmab txiv ntoo husk cov qoob loo xws li nplej straw hmoov, txiv laum huab xeeb hmoov, thiab txiv maj phaub husk hmoov.
● Xws li cov khoom siv yas, cov kua roj hauv lub cev thiab lwm yam, qhov ceev ntawm cov ntshiab polyvinyl chloride yog 1.4g / cm3, thiab plasticized polyvinyl chloride (muaj kwv yees li 40% plasticizer) yog 1.19 ~ 1.35;

3. Kev sib xyaw ntawm cov khoom siv hnyav
Ntxiv cov yas uas tsis tshua muaj siab, xws li PE, PP, CPE, ABS, MBS; kuj tseem muaj ib hom kev sib xyaw ua ke: ntoo hmoov, uas yog cov fiber ntau ntawm cov ntoo, uas yog lub teeb heev. Tab sis muaj qee qhov kev txwv, raws li koj siv ntau txoj kev.

2. Yuav ua li cas thiaj li ua kom cov yas ntom ntom?
Nce cov yas ntom ntom yog txoj hauv kev kom nce cov txheeb ze ntawm cov khoom lag luam qub, feem ntau yog los ntawm kev ntxiv cov khoom siv hnyav thiab cov khoom hnyav sib xyaw.

1. Ntxiv hnyav muab tub lim
● Hlau hmoov
● Heavy ntxhia muab tub lim
2. Sib tov hnyav resin
Txoj kev no muaj kev txhim kho me me thiab feem ntau tuaj yeem ncav cuag li 50% ntawm qhov siab tshaj plaws. Nws yog qhov tsim nyog rau qee lub teeb resins xws li PE, PP, PS, EVA, PA1010, thiab PPO, thiab lwm yam. Heavy resins feem ntau ntxiv yog PTFE, FEP, PPS, thiab POM, thiab lwm yam.

3. Yuav ua li cas hloov lub hardness ntawm yas?
1. Lub tswv yim thiab sawv cev ntawm hardness
Hardness yog hais txog cov khoom muaj peev xwm tiv taus lwm yam khoom nyuaj dua rau hauv nws qhov chaw.
Lub hardness tus nqi yog ib tug conditional quantitative reflection uas characterizes lub hardness ntawm cov khoom. Nws tsis yog ib qho ntshiab thiab meej lub cev kom muaj nuj nqis. Qhov loj ntawm tus nqi hardness tsis tsuas yog nyob ntawm cov khoom nws tus kheej tab sis kuj nyob ntawm qhov kev sim thiab kev ntsuas. Nrog cov kev ntsuas sib txawv hardness, tus nqi hardness ntsuas rau tib cov khoom tsis zoo ib yam. Yog li ntawd, los sib piv cov hardness ntawm cov ntaub ntawv, tib txoj kev ntsuas tus nqi hardness yuav tsum tau siv rau kev sib piv.

Muaj ntau txoj hauv kev uas feem ntau siv los qhia txog hardness:
● Ntug hardness
● Rockwell hardness
● Mohs hardness

2. Kev sib xyaw ua ke txhim kho cov tawv tawv ntawm cov yas
Cov txheej txheem kev txhim kho cov yas sib xyaw yog muab cov tawv tawv tawv nrog cov tawv tawv qis kom nws cov tawv tawv tag nrho. Cov txheej txheem sib xyaw ua ke yog PS, PMMA, ABS, thiab MF, thiab lwm yam. Cov resins uas yuav tsum tau hloov kho yog PE, PA, PTFE, thiab PP.
3. Kev sib xyaw ua ke los txhim kho cov tawv tawv ntawm cov yas
Cov txheej txheem ntawm cov yas compounding los txhim kho hardness yog muab ib txheej ntawm high-hardness resin rau low-hardness yas khoom 'qhov chaw. Txoj kev no tsuas yog tsim nyog rau cov khoom siv extruding, xws li daim hlau, nplooj ntawv, zaj duab xis, thiab cov kav dej. Feem ntau siv cov resins yog PS, PMMA, ABS, thiab MF.
4. Txhim kho qhov tawv tawv ntawm cov yas
Txoj kev no tsuas yog kev txhim kho cov khoom yas sab nraud hardness, thaum lub hardness sab hauv ntawm cov khoom tseem tsis hloov. Qhov no yog tus nqi qis hardness txhim kho txoj kev.
Txoj kev hloov kho no tsuas yog siv rau vaj tse, cov khoom siv kho kom zoo nkauj, cov khoom siv kho qhov muag, thiab cov khoom siv niaj hnub. Txoj kev hloov kho no suav nrog peb txoj kev qhia meej: txheej, plating, thiab kho qhov chaw.

4.Yuav ua li cas los txhim kho qhov yooj yim ntawm cov yas?
Intuitively hais lus, yas qhov hloov tau hais txog qhov muag ntawm cov khoom yas. Ntawd yog, qhov softer cov khoom yas, qhov zoo dua nws yooj. Hauv polymer physics, qhov yooj yim txhais tau tias yog cov cuab yeej ntawm cov saw hlau polymer uas tuaj yeem hloov pauv lawv qhov sib xws. Kev hloov pauv ntawm cov yas yog nyob ntawm cov qauv saw molecular ntawm nws cov polymer.

1. Ntxiv cov yas yas
Plasticizer yog hais txog ib chav kawm ntawm cov khoom uas tuaj yeem txhim kho plasticity ntawm polymers. Nws tsuas yog siv rau PVC cob. Tus nqi ntawm cov yas yas hauv PVC tuaj yeem suav txog ntau dua 98% ntawm tag nrho cov nyiaj yas yas. Ntxiv rau PVC, cov yas yas kuj tseem siv rau hauv cov khoom siv polymer xws li PVDC, CPE, SBS, polyvinyl acetate, nitrocellulose, PA, ABS, thiab PVA.
2. Lub luag haujlwm tseem ceeb ntawm plasticizers yog raws li hauv qab no:
● Txo cov melting kub thiab yaj viscosity ntawm cov polymer, yog li txo nws cov molding ua kub.
● Ua cov khoom polymer uas muaj softness, elasticity, thiab tsis kub-resistant.

3.Cov txheej txheem tshwj xeeb ntawm kev ua ntawm cov yas yas yog raws li hauv qab no:
● Volume nyhuv
● Tiv thaiv cov nyhuv

5. Txhim kho cov yas gloss
Muaj ob txoj hauv kev los txhim kho cov gloss ntawm cov yas. Ib qho yog txhawm rau txhim kho qhov gloss ntawm cov khoom yas, uas hu ua kev hloov kho brightening; lwm qhov yog txo cov khoom yas 'gloss nto, hu ua matting modification.
Brightening ntawm plastics txhais tau tias txhim kho qhov gloss nto los yog tiav ntawm cov khoom yas. Dhau li ntawm qhov tsim nyog xaiv ntawm cov khoom siv raw, cov txheej txheem tshwj xeeb suav nrog ntxiv txoj kev ci ntsa iab, sib xyaw txoj kev ci ntsa iab, cov qauv tswj kev ci ntsa iab, cov khoom siv molding smoothness tswj, ob txoj kev ua haujlwm ci ntsa iab, thiab txheej txheej ci ntsa iab, thiab lwm yam.

Cov hauv qab no feem ntau qhia txog txoj kev ci ntsa iab ntawm cov yas:
1. Kev xaiv cov khoom siv yas
Kev xaiv tsim nyog ntawm cov khoom siv yas yog qhov tseem ceeb tshaj plaws los txhim kho qhov chaw tiav ntawm cov khoom yas. Yog tias cov khoom siv raw raug xaiv zoo, nws yooj yim los txhim kho lub gloss; txwv tsis pub, nws yog qhov nyuaj dua.
Cov khoom siv yas tuaj yeem faib ua ob pawg: resins thiab additives.
2. Kev xaiv ntawm resin
Cov yam ntxwv ntawm cov resin muaj qhov cuam tshuam loj dua rau qhov gloss ntawm cov khoom yas, thiab nws yog txoj hauv kev zoo tshaj plaws los tswj cov gloss ntawm cov khoom yas. Nws txoj kev cuam tshuam ntawm qhov gloss ntawm cov khoom yas cuam tshuam feem ntau yog nyob ntawm cov hauv qab no:

1) Ntau hom resin
Lub gloss ntawm cov khoom muaj feem xyuam ntawm ntau hom resin sib txawv heev. Nws feem ntau txiav txim siab tias qhov ci ntawm cov khoom siv hauv qab no zoo dua: melamine resin, ABS, PP, HIPS, PE, POM, PMMA, thiab PPO, thiab lwm yam, ntawm cov melamine resin thiab ABS ob hom gloss yog feem ntau. zoo heev.
Rau tib cov resin, cov txheej txheem synthesis sib txawv, thiab cov gloss ntawm cov resin sib thooj rau cov khoom kuj tseem ntxiv. Piv txwv li:
● Rau PP, lub glossiness ntawm ntau hom synthesized los ntawm lwm yam polymerization txoj kev yog raws li nram no: PP-R> homopolymer PP> thaiv copolymer PP.
● Rau PE, qhov ci ntawm peb hom sib txawv yog raws li hauv qab no: LDPE> LLDPE> HDPE
● Rau PVC, emulsion PVC resin muaj ib tug ntau dua luster dua suspension PVC resin.
● Rau PS resin, qhov ci ntsa iab ntawm kev cuam tshuam siab polystyrene (HIPS) yog ntau dua li ntawm cov hom phiaj dav dav polystyrene (GPPS)

2) Cov yam ntxwv ntawm cov resin
Cov yam ntxwv tshwj xeeb yog txawv, thiab gloss kuj yog lwm yam. Ntawm cov yam ntxwv ntawm cov resin, cov yam ntxwv uas cuam tshuam rau lub ci.
● Feem ntau, qhov ntau dua qhov melt flow rate (MFR), qhov ntau dua qhov ci ntawm cov khoom muaj feem xyuam.
● Kev cuam tshuam ntawm qhov hnyav molecular yog feem ntau cuam tshuam nrog qhov dav ntawm molecular hnyav faib. Qhov dav ntawm qhov hnyav molecular faib, qhov qis dua qhov gloss ntawm cov khoom muaj feem xyuam. Qhov no yog vim qhov kev faib tawm molecular hnyav yog qhov dav, thiab qhov tsis sib xws ntawm cov khoom tau nce.
● Kev cuam tshuam ntawm kev nqus dej Cov resin nrog cov dej nqus dej siab muaj qhov cuam tshuam loj dua rau nws cov khoom muaj feem xyuam 'gloss. Piv txwv li, PA, PI, PSF, thiab PC nrog ester pawg (-COOR) thiab galantamine pawg (-CONH2) nyob rau hauv lub molecule, yog tias nws tsis qhuav los yog qhuav tsis tiav, dej ripples, npuas, thiab nyiaj nyob ntawm tej yuav raug tsim nyob rau hauv lub molecule. qhov saum npoo ntawm cov khoom. , markings, blemishes, thiab lwm yam., kom lub nto gloss yog ho txo.

3. Xaiv cov khoom siv ntxiv
Ntawm tag nrho cov yas additives, fillers muaj qhov cuam tshuam loj tshaj plaws ntawm gloss, ua raws li cov yas yas, stabilizers, thiab nplaim hluav taws, tab sis cov nyhuv me me. Kev cuam tshuam ntawm fillers ntawm gloss tuaj yeem faib ua cov hauv qab no:

1) Hom muab tub lim
Cov fillers sib txawv muaj qhov sib txawv ntawm gloss. Tsuas yog cov iav microbeads, yuav luag tag nrho cov fillers yuav txo qhov ci ntawm cov khoom ntim, tab sis qhov poob yog ntxiv.
Kev cuam tshuam ntawm ntau cov khoom siv rau ntawm qhov ci ntawm cov khoom ntim yog raws li hauv qab no: hlau ntsev> iav fiber ntau
2) Cov duab ntawm qhov muab tub lim
Cov duab microscopic sib txawv ntawm cov khoom muab tub lim muaj lwm yam cuam tshuam rau lub gloss ntawm cov khoom ntim. Qhov kev txiav txim ntawm qhov loj ntawm qhov cuam tshuam yog spherical
3) Qhov luaj li cas ntawm cov muab tub lim
Qhov me me ntawm qhov muab tub lim qhov loj me, qhov me me qhov txo qis hauv cov khoom muab tub lim lub gloss. Tsis tas li ntawd, qhov muab tub lim particle loj qhov dav dav sib txawv, thiab cov nyhuv ntawm qhov ci ntawm cov khoom ntim kuj txawv. Txoj cai tswjfwm yog qhov ua tiav ntau dua qhov muab tub lim particle loj faib, qhov qis dua qhov gloss ntawm cov khoom siv. Qhov no feem ntau yog vim qhov tseem ceeb ntawm qhov muab tub lim qhov loj ntawm qhov ntau, qhov ntau qhov tsis sib xws ntawm cov khoom ntim khoom, qhov ntau dua qhov teeb meem teeb pom kev tuaj yeem ua rau muaj kev cuam tshuam.
4) Sau tus nqi ntawm cov muab tub lim
Lub filling ntawm cov muab tub lim nce thiab qhov chaw gloss ntawm cov khoom ntim qis. Kev siv CaCO3 tau txais kev pabcuam PP raws li piv txwv, thaum CaCO3 sau tus nqi yog 5%, cov khoom xa tawm ntawm qhov gloss yog 50%. Thaum lub CaCO3 sau tus nqi yog 15%, lub gloss ntawm lub filling poob mus rau 32%.