Quasi-MDI Ester asosidagi poliuretan prepolimerlari quyma elastomer uchun

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%, prepolimer esa past darajadagi erkin izosiyanatlarga ega tizimlarni nazarda tutadi (<12%). Overall, over 400 million pounds a year of prepolymer is used commercially for many applications where the advantages of prepolymers can be realized.

Ushbu Quasi-MDI ester asosidagi Poliuretan prepolimerlari uchta A/B/C komponentidan iborat. Komponent A - bu izotsinat bilan yakunlangan Quasi-MDI poliester prepolimeri, B komponenti - poliester poliol, C komponenti - 1,4BDO.

Uning kvazi prepolimer tizimlari pastroq yopishqoqlikdagi prepolimerlar va davolash vositalarini, ishlov berish uchun pastroq material haroratini, bir xil tizimga ega ko'p qattiqlikdagi elastomerlarni, shuningdek, atrof-muhit va sog'liqni saqlashni yaxshilashni taklif qilish orqali an'anaviy to'liq prepolimerlarga nisbatan ma'lum afzalliklarni ta'minlashi mumkin.

Asosiy afzallik - bu ishlab chiqarish samaradorligini oshirishga imkon beradigan qisqa vaqt ichida.

• Zo'r mexanik xususiyatlar
• Sozlanishi mumkin bo'lgan reaktivlik, ya'ni katalizatorni tanlash va aralashma nisbati
• Juda katta qismlarni quyish uchun javob beradi
• Normativ cheklovlarga duch kelishi mumkin bo'lgan tizimlarga munosib alternativalar
• Kattaroq barqarorlik uchun energiya sarfini kamaytirish

Kvazi-MDI ester asosidagi tizimlar uglevodorodlar, moylar va erituvchilar kabi kimyoviy moddalarga mukammal qarshilik bilan yuqori aşınma va yirtiqqa chidamlilikni ta'minlaydi. Ushbu tizimlar ekranlar, qirg'ichlar, PIGlar, beton pichoqlar, choyshablar va tebranish idishlari kabi ilovalar uchun ideal tanlovdir.

Ushbu Quasi MDI POLYESTER tizimi odatda 200 kg / temir barabanga qadoqlanadi

Issiq teglar: quyma elastomer uchun kvazi-mdi ester asosidagi poliuretan prepolimerlari, Xitoy quyma elastomer uchun kvazi-mdi ester asosidagi poliuretan prepolimerlari ishlab chiqaruvchilar, etkazib beruvchilar, zavod