Quasi-MDI Ester-raws li Polyurethane Prepolymers Rau Cast Elastomer

In principle, a prepolymer could be formed by reacting diisocyanates with an excess of polyol to produce a polyol functional prepolymer with urethane functionality at its center, but this is not practiced commercially and the term "prepolymer" is always used to refer to polyols terminated with isocyanate functionality. The excess isocyanate is required to prevent molecular weight growth caused by opportunistic chain extension of unreacted polyol reacting with the isocyanate-terminated prepolymer. In practice, chain extension always occurs but can be limited by increasing the ratio of isocyanate to hydroxyl functionality. A true "prepolymer" in this regard would then distill the excess isocyanate from the product. In the case where the excess isocyanate is left in the product, this is referred to as a "quasi-prepolymer". In practice, quasi-prepolymer refers to systems with relatively high levels of free isocyanate (>12%), thaum prepolymer hais txog cov tshuab uas muaj qib qis ntawm isocyanates dawb (<12%). Overall, over 400 million pounds a year of prepolymer is used commercially for many applications where the advantages of prepolymers can be realized.

Qhov no Quasi-MDI ester-based Polyurethane prepolymer muaj peb yam A / B / C. Cheebtsam A yog Quasi-MDI polyester prepolymer uas xaus nrog isocynate, Cheebtsam B yog polyester polyol, Cheebtsam C yog 1,4BDO.

Nws cov txheej txheem quasi prepolymer tuaj yeem muab qee yam zoo dua li cov pa puv puv prepolymer los ntawm kev muab qis dua viscosity prepolymers thiab curatives, qis cov khoom siv kub rau kev ua, ntau hardness elastomers nrog tib lub cev, nrog rau kev saib xyuas zoo ib puag ncig thiab kev noj qab haus huv.

Lub ntsiab kom zoo dua yog nyob rau hauv ib tug luv luv demoulding lub sij hawm, enabling nce productivity.

• Cov khoom siv kho tshuab zoo heev
• Kho reactivity, piv txwv li xaiv cov catalyst thiab sib tov piv
• Haum rau casting qhov loj heev
• Muaj lwm txoj hauv kev rau cov kab ke uas yuav ntsib cov kev txwv
• Txo kev siv hluav taws xob kom ruaj khov dua

Quasi-MDI ester-based systems muab kev ua kom zoo dua thiab ua kua muag nrog kev ua haujlwm zoo rau cov tshuaj xws li hydrocarbons, roj thiab cov kuab tshuaj. Cov tshuab no yog qhov kev xaiv zoo tshaj plaws rau kev siv xws li cov ntxaij vab tshaus, scrapers, PIGs, pob zeb, cov nplooj ntawv thiab cov tais vibratory.

Qhov Quasi MDI POLYESTER System Feem ntau ntim hauv 200kg / hlau nruas

Cim npe nrov: Tuam Tshoj quasi-mdi ester-based polyurethane prepolymer rau cam khwb cia elastomer, Tuam Tshoj quasi-mdi ester-raws li polyurethane prepolymers rau cam khwb cia elastomer manufacturers, lwm tus neeg, Hoobkas