Fiber-reinforced rigid polyurethane foam composite railway sleeper with high fiber content and manufacturing method thereof
US10538615B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 14, 2017 |
| Grant date | Jan 21, 2020 |
| Priority date | — |
| Expiry date | Aug 14, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J9/0085
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A fiber-reinforced rigid polyurethane foam composite railway sleeper with high fiber content and a manufacturing method thereof. The railway sleeper is formed by bonding a plurality of fiber-reinforced rigid polyurethane foam composite boards with high fiber content by a binder, and the outer surface of the railway sleeper is provided with an anticorrosive paint film. The fiber-reinforced rigid polyurethane foam composite boards with high fiber content include a polyurethane resin as a matrix material and a fiber as a reinforcing material. The problem of insufficient impregnation of the polyurethane and the fiber is solved by using a plurality of technical means such as using a mixed polyether polyol having a low hydroxyl value and a low functionality, using a coupling agent, etc., thus a fiber-reinforced rigid polyurethane foam composite product having a density higher than 840 kg/m3 and a fiber content greater than 60% is manufactured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.