| 发明名称 |
Elastomers for paper mill equipment |
| 摘要 |
Embodiments of the invention provide for paper mill equipment that can better withstand the conditions of a paper mill. Embodiments encompass paper mill equipment that incorporate a polyurethane layer having a hysteresis value of less than 70% and a permanent set of less than 30%. The polyurethane layer includes a polyurethane produced by curing a mixed composition. The mixed composition includes at least a urethane prepolymer (A) and at least a curing agent (B) having an active hydrogen group (H). The urethane prepolymer (A) has at least one terminal isocyanate group and is obtained by reacting at least a polyisocyanate compound (a) with at least a polycarbonate diol compound (b) having a number average molecular weight of at least 1500 g/mol. The curing agent (B) includes at least an amine compound. The elastomer compositions are also useful to coat the acid pickling roller in the steel industry. |
| 申请公布号 |
US9096707(B2) |
申请公布日期 |
2015.08.04 |
| 申请号 |
US201314374056 |
申请日期 |
2013.02.07 |
| 申请人 |
Dow Global Technologies LLC |
发明人 |
Singh Harpreet;Heath William H.;Singh Amarnath;Chowdhury Asfar N.;Grigoriew Marcin;Aou Kaoru |
| 分类号 |
C08G18/48;C08G18/44;C08G18/76;C08G18/10;C08G18/12;C08G18/32;C08G18/40;D21F1/00 |
主分类号 |
C08G18/48 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. An elastomeric cover for papermaking rollers or acid pickling rollers, the elastomeric cover being coated on a papermaking roller or an acid pickling roller and comprising a polyurethane layer having a hysteresis value of less than 70% and a permanent set of less than 30%;
wherein the polyurethane layer comprises a polyurethane produced by curing a mixed composition comprised of at least a urethane prepolymer (A) and at least a curing agent (B) having an active hydrogen group (H), the at least a urethane prepolymer (A) and the at least a curing agent (B) being reacted at a first isocyanate index from 85 to 120, the urethane prepolymer (A) having at least one terminal isocyanate group and is obtained by reacting at least a polyisocyanate compound (a) with polyol components that includes at least a polycarbonate diol compound (b), having a number average molecular weight of at least 1500 g/mol, the polyisocyanates compound (a) and the polyol components being reacted at a second isocyanate index between 120 and 2000, and the curing agent (B) comprising at least an amine compound. |
| 地址 |
Midland MI US |
