Yus uas xaiv PVA 1788 uas zoo rau kev kho tshuaj rau cov ntawv

Cov ntsiab lus ntawm PVA 1788 uas qhia tias nws yuav siv los kho cov khoom

Daim ntawv ceev (88%) thiab daim ntawv tshuaj: kev puas tsuaj rau qhov pheej ywm thiab qhov yuav siv

PVA 1788’s 88% alcoholysis degree tsis hais tias nws yog qhov hydrolysis ntawm qhov sib tw—tsis txhob tso cia cov acetate groups rau kev nyab xeeb thiab cov hydroxyl groups rau kev haum los ntawm dej thiab kev nyab xeeb rau cov fibers. Qhov architecture ntawm nws yog qhov uas muaj kev nyab xeeb thiab kev yuav, uas yog qhov tseem ceeb rau kev npaj cov warp yarns thaum ua haujlwm nrog qhov meej. Nws medium viscosity (21.0–24.5 mPa·s nyob rau hauv 4% aqueous solution nyob rau hauv 20°C) hais tias nws muaj qhov polymerization degree uas yog qhov tseem ceeb rau kev nyab xeeb thiab kev yuav, uas pab tau kev nyab xeeb rau kev nyab xeeb thiab kev yuav thaum loom ua haujlwm. Rau cov cotton–polyester blends, qhov kev nyab xeeb no pab txog kev txhob tso cia cov end-breakage thiab lint shedding; cov sized yarns muaj kev txhob tso cia cov hairiness 25–30% ntau dua cov unsized yarns, uas pab tau kev ua haujlwm ntau dua. Cov film uas muaj los no tsis tuaj yeem tshuam los thaum yuav thiab abrasion—qhov tseem ceeb rau kev nyab xeeb thaum loom ua haujlwm ntau dua thiab tsis tuaj yeem tshuam los ntau dua.

Kev haum los thiab kev desizability uas muaj kev tswj hwm nyob rau hauv cov industrial washing processes

PVA 1788 yog qhov tsoo uas yuav tawm hauv dej ntws (≥20°C), thiab qhov no yog rau li cas nws muaj 88% hydrolysis thiab muaj molecular weight uas tsis loj thiab tsis kub. Qhov tsoo uas yuav tawm hauv dej ntws yog qhov tsoo uas tuaj yeem tawm hauv dej tshuaj tshuaj rau kev tshuaj tshuaj hauv kev tshuaj tshuaj, thiab yuav tawm hauv 15 feeb nyob rau hauv dej tshuaj tshuaj 40°C—tshuaj tshuaj tau 99% los ntawm kev tshuaj tshuaj, thiab tsis xav tau kev tshuaj tshuaj nrog enzyme lossis oxidative treatments. Qhov tsoo uas muaj ob qhov tswv yim: hydrophilic hydroxyl thiab hydrophobic acetate groups yog qhov tswv yim uas txheeb xyuas nws qhov ua haujlwm: acetate groups yog qhov tswv yim uas txheeb xyuas kev tawm hauv dej rau kev tshuaj tshuaj, thiab hydroxyls yog qhov tswv yim uas txheeb xyuas kev tawm hauv dej thiab kev tawm hauv dej tshuaj tshuaj. Qhov tsoo uas muaj kev tshuaj tshuaj zoo yog qhov tsoo uas txheeb xyuas kev siv dej thiab kev siv hluav tais tawm hauv 20% los ntawm kev siv starch-based systems thiab qhov no yog qhov tsoo uas txheeb xyuas kev tshuaj tshuaj thiab kev tshuaj tshuaj zoo rau kev tshuaj tshuaj thiab kev tshuaj tshuaj.

Sib npaug PVA 1788 rau Fiber Type thiab Weaving Requirements

Yog li cas PVA 1788 yog qhov zoo heev rau cotton-polyester blends thiab high-speed weaving

PVA 1788's molecular duality—hydroxyl groups for hydrogen bonding with cotton cellulose and acetate groups for affinity with polyester—enables uniform, cohesive film formation across blended yarns, a challenge for single-affinity sizing agents. In high-speed air-jet looms (≥850 rpm), its film delivers exceptional tensile strength thiab elongation, resisting disintegration under cyclic tension and abrasive forces in the weaving shed. Field data from a leading textile research institute confirms that for fabrics with up to 60% polyester content, PVA 1788 significantly suppresses sizing dust generation during beating-up, sustaining weaving efficiency above 92% (2023).

Limitations with pure synthetics or low-tension fabrics requiring lower-viscosity alternatives

PVA 1788 tsis muaj peev xwm zoo heev rau hauv cov yam tshuab uas muaj qhov ntsiab ntawm polyester lossis nylon, uas qhov ntsiab ntawm lawv yog qhov zoo thiab tsis muaj qhov ntsiab los ntawm cov dej, thiab qhov no yog qhov ua rau cov ntsiab ntawm PVA 1788 tsis tuaj yeem nyob hauv lawv—thiab yuav ua rau cov yam tshuab tsis tau txais cov ntsiab. Rau cov yam tshuab no, cov yam tshuab uas muaj qhov ntsiab ntawm dej tsis tau txais (xws li PVA uas tau txais cov dej heev thiab muaj qhov ntsiab ntawm dej zoo heev) yog qhov zoo dua. Tsis tas li ntawd, rau cov yam tshuab uas muaj qhov ntsiab ntawm dej tsis tau txais lossis cov yam tshuab uas muaj qhov ntsiab ntawm dej tsis tau txais, qhov ntsiab ntawm PVA 1788 yog qhov ntsiab ntawm dej zoo heev thiab yuav ua rau tsis tau txais cov yam tshuab hauv qhov ntsiab ntawm dej zoo heev, thiab yuav ua rau qhov ntsiab ntawm dej tsis tau txais thiab yuav ua rau cov yam tshuab tsis tau txais cov ntsiab. Rau cov yam tshuab no, cov yam tshuab uas muaj qhov ntsiab ntawm dej tsis tau txais xws li PVA 0588 yog qhov zoo dua—thiab yuav ua rau cov yam tshuab tau txais cov ntsiab zoo heev thiab tsis tau txais cov ntsiab heev heev, thiab yuav ua rau cov yam tshuab tau txais cov ntsiab zoo heev thiab tsis tau txais cov ntsiab heev heev.

PVA 1788 vs. Cov yam tshuab uas muaj peev xwm zoo heev: Yuav ua li cas kom xaiv nws rau 1799, 0588, lossis 2488

Cov kev sib piv: qhov ntsiab ntawm dej, qhov ntsiab ntawm dej, thiab qhov ntsiab ntawm dej rau cov yam tshuab PVA uas muaj peev xwm zoo heev

Ku xaiv cov PVA tshuab zoo tshaj plaws yog ua raws li kev sib tw ntawm kev ua haujlwm ntawm cov ntaub qhia, kev nyha rau ntawm cov ntaub, thiab kev ua haujlwm ntawm kev txhawb nqa—txhua yam no sib koom rau ntawm cov ntaub thiab kev npaj ntawm loom. Yog tias xaiv tsis zoo, yuav muaj kev puas tsuaj los ntawm cov ntaub uas muaj ntau lub cua lossis cov ntaub uas muaj kev puas tsuaj rau hauv kev ua haujlwm. Cov lus hauv qab no sib tw cov qhia tshaj plaws:

Qhov kev sib tw yog rau hauv qhov kev sib tw ntawm kev nyuaj thiab kev ua kom los ntawm kev sov. PVA 1799 muaj kev nyuaj zoo dua, tab sis kev sov nws yuav tsum sov ntau (ntau dua 90°C), uas yuav ua rau tsis tau sov tag nrho thiab muaj kev nyuaj nyob hauv cov ntaub. PVA 1788 muaj kev sib tw zoo: kev nyuaj zoo rau cov ntaub ntawv los ntawm kev sib npaug thiab muaj kev sov tag nrho ntau dua 95% rau kev sov hauv qhov cim sov tshwj xeeb—txhais li cas uas tseem ceeb rau kev kho ntaub raws li qhov tshwj xeeb thiab rau kev nyab xeeb ntawm kev ua haujlwm. Cov viscosity ntawm nws kuj sib txuas zoo rau kev ua ntaub ntawv hauv qhov kev ua haujlwm ntau dua, tsis muaj kev nyuaj nyob rau hauv cov ntaub ntawv uas muaj kev nyuaj ntau dua thiab tsis muaj kev nyuaj nyob rau hauv cov ntaub ntawv uas muaj kev nyuaj tsis ntau.

Kev ua kom zoo dua PVA 1788: Qhov ntau ntawm cov ntaub ntawv, qhov sov, thiab kev sib txuas

Kev siv cov qhov ntsuas tseem ceeb rau PVA 1788 yuav tsum muaj kev paub zoo txog cov qhov ntsuas, cov qhov siab, thiab cov khoom siv uas tuaj yeem sib npaug. Ib qhov ntsuas ntawm 6–10% ntawm cov khoom siv yuav tshwm sim rau kev ua haujlwm zoo tshaj plaws rau kev tsim cov ntawv thiab kev tswj hwm: cov ntawv ntau ntau (40s–60s Ne) yuav ua haujlwm zoo tshaj plaws nyob rau qhov ntsuas ntau ntau; cov ntawv ntau ntau dua (10s–20s Ne) yuav tsum muaj ntau dua 10% rau kev tswj hwm rau kev tswj hwm ntawm cov ntawv ntau ntau. Yog tias ntau dua 12%, yuav muaj kev puas tsuaj rau cov ntawv thiab yuav ua rau kev ua haujlwm ntawm cov ntawv tsis zoo thiab yuav ua rau kev tshem cov ntawv yuav tshwm sim.

Kev tswj hwm cov qhov siab kuj yog ib qho tseem ceeb li cas. Kev tswj hwm cov qhov siab yuav tsum muaj kev tswj hwm rau cov dej uas muaj qhov siab ntawm 80–90°C thiab muaj kev tswj hwm rau cov dej rau 30–60 feeb—thiab tsis txhob muaj cov khoom siv uas tsis tau siv rau kev tswj hwm rau cov ntawv thiab yuav ua rau cov ntawv tsis zoo. Thaum cov khoom siv tau siv lawm, yuav tsum tswj hwm cov dej rau qhov siab ntawm 60–70°C rau kev tswj hwm rau cov ntawv thiab kev tswj hwm rau cov ntawv thiab tsis txhob muaj kev puas tsuaj rau cov khoom siv. Yog tias cov dej yuav tshem qhov siab ntau dua, yuav muaj kev tswj hwm rau cov ntawv thiab yuav ua rau cov ntawv tsis zoo rau kev ua haujlwm.

PVA 1788 yog li ntau tshiab thiab siv tau zoo rau cov khoom sib tw: nws yog qhov sib tw zoo rau starches uas muaj oxygen, carboxymethyl cellulose (CMC), thiab acrylic binders—ua rau cov khoom sib tw hauv qhov tshwm sim no yuav ua tau zoo thiab tsis muaj txiaj ntsig loj. Thov 0.5–1% ntawm non-ionic wax emulsion yuav pab txo kev cuam tshuam thiab kev cuam tshuam ntawm qhov ceev; qhov stability rau pH 5–7 yog qhov tseem ceeb, yog li ntawd tsis txhob siv cov khoom uas muaj acid loj lossis alkalis los tsis txhob polymer hydrolysis. Rau cov systems uas muaj kev cuam tshuam loj, ib qho defoamer uas tsis muaj silicone yuav pab txo kev cuam tshuam ntawm aj thiab tsis txhob kev cuam tshuam rau kev siv sizing. Ib qho mill trial los ntawm ib qho textile research center tshwj xeeb tau qhia tias ib qho blend ntawm 8% PVA 1788 / 4% modified starch / 0.8% lubricant tau pab txo kev ua haujlwm ntawm weaving los ntawm 18% vim tias yog siv starch puav leej xwb rau kev sizing hauv qhov tsiab zoo ib yam (2023).

FAQ

Lub ciaj ciaj 1: Puas yog PVA 1788 yog qhov zoo rau cotton-polyester blends?

Tswv yim: Lub molecular structure ntawm PVA 1788 muaj hydroxyl groups uas pab koom nrog cotton thiab acetate groups uas pab koom nrog polyester, ua rau muaj ib qho film uas zoo thiab sib koom rau cov yarns uas muaj ob yam.

Lub ciaj ciaj 2: Puas yog qhov twg ua rau PVA 1788 yog qhov siv tau zoo rau cold water?

A: Nws 88% hydrolysis degree thiab li cas thiab nws moderate molecular weight txhais tias nws yuav tsum tau los ua kom zoo, thiab nws txhais tias nws yuav tsum tau los ua kom tsis muaj residue thaum ua haujlwm ntawm industrial washing.

Q3: Puas PVA 1788 tuaj yeem siv rau 100% synthetic yarns?

A: PVA 1788 tsis muaj effect rau synthetic filament yarns vim nws tsis muaj adhesion properties zoo heev; cov grades uas muaj hydrolyzed heev yuav zoo dua rau cov no.

Q4: Yuav ua li cas kom paub qhov concentration zoo tshaj plaws ntawm PVA 1788?

A: Qhov concentration 6–10% solids yog qhov recommended, thiab cov finer yarns yuav tsum tau qhov concentration ntau dua, thiab cov coarser yarns yuav tsum tau qhov concentration ntau dua thaum muaj high loom tension.

Q5: PVA 1788 sib piv rau lwm cov PVA grades li cas?

A: Thaum sib piv rau lwm cov alternatives li PVA 1799 lossis 0588, PVA 1788 muaj qhov balance ntawm adhesion, flexibility, thiab desizing efficiency rau high-speed weaving thiab blended fibers.