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Fiber-reinforced rigid polyurethane foam synthesis sleeper with high fiber content and manufacturing method of sleeper

A polyurethane rigid foam, fiber-reinforced technology, used in tracks, ballast layers, buildings, etc., can solve the problems of unstable quality, uneven impregnation of polyurethane and fibers, increased production costs, etc., to increase impregnation capacity and adhesion capacity. , The effect of product specification and performance diversification, production method and process simplification

Pending Publication Date: 2016-11-16
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the strength of FRP hollow sleepers meets the requirements, the pullout strength of the spikes is less than 3T, which is far less than the technical index requirement that the pullout strength of the spikes is greater than 6T, and cracks appear in the fatigue test
None of the above synthetic sleepers can meet the test index requirements of railway sleepers in full performance
[0008] The fiber-reinforced polyurethane hard foam synthetic sleepers in Japan and China are all made of polyether polyol and isocyanate. It can be solidified in about 3 minutes, and the selected polyether polyol has high viscosity and poor fluidity. It is difficult to solve the problem of uniform impregnation of polyurethane and fiber before polyurethane curing. Medium fiber content is low, and polyurethane and fiber are impregnated unevenly, local polyurethane content is high, cells are large, local fiber content is high, and dry yarn phenomenon occurs, resulting in low strength of the material, uneven strength and unstable quality
Moreover, due to its low fiber content and high resin content, during production, the resin foams and expands to produce a large amount of flash, which not only causes product waste, increases production costs, but also causes great damage to equipment and molds.
Not only that, but because it cannot solve the impregnation problem of polyurethane and fibers, it has not produced fiber-reinforced polyurethane foam synthetic sleepers with higher glass fiber content, nor has it produced higher-density fiber-reinforced sleepers with higher glass fiber content. Polyurethane foam composite sleeper
At present, there is no report and there is no density higher than 840kg / m in the market 3 Fiber-reinforced polyurethane foam synthetic sleepers with a fiber content higher than 60%

Method used

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  • Fiber-reinforced rigid polyurethane foam synthesis sleeper with high fiber content and manufacturing method of sleeper
  • Fiber-reinforced rigid polyurethane foam synthesis sleeper with high fiber content and manufacturing method of sleeper
  • Fiber-reinforced rigid polyurethane foam synthesis sleeper with high fiber content and manufacturing method of sleeper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076]In terms of parts by mass, the formula of the polyurethane resin and the ratio of the polyurethane resin to the reinforcing fiber are as follows: 90 parts of polyether polyol A with a hydroxyl value of 400-480 and a functionality of 1-3, a hydroxyl value of 60-160 and a functionality of 1-2 10 parts of polyether polyol B, 10 parts of flame retardant, 5 parts of hard foam stabilizer, 15 parts of coupling agent, 0.3 part of catalyst, 0.1 part of foaming agent, 0.3 part of antioxidant, 0.3 part of anti-ultraviolet agent, 120 parts of isocyanate; 430 parts of long fiber, 10 parts of chopped fiber, 5 parts of fiber mat. Among them, the reinforcing fiber content is 64%, and the production density is 1400±50Kg / m 3 Fiber-reinforced polyurethane rigid foam composite sheet specification: 260mm×50mm×3000mm. Parameter setting of crawler lamination host: running speed: 0.4m / min, temperature: 90°C / 60°C. Grind the surface of the composite board, use vinyl resin as the binder, and bon...

Embodiment 2

[0080] In terms of parts by mass, the formula of the polyurethane resin and the ratio of the polyurethane resin to the reinforcing fiber are as follows: 95 parts of polyether polyol A with a hydroxyl value of 400-480 and a functionality of 1-3, a hydroxyl value of 60-160 and a functionality of 1-2 5 parts of polyether polyol B, 10 parts of flame retardant, 3 parts of hard foam stabilizer, 5 parts of coupling agent, 0.3 parts of catalyst, 0.1 part of foaming agent, 0.3 parts of antioxidant, 0.3 parts of anti-ultraviolet agent, 110 parts of isocyanate; 410 parts of long fiber, 10 parts of chopped fiber, 0 parts of fiber mat. Among them, the reinforcing fiber content is 65%, and the production density is 1200±50Kg / m 3 Fiber-reinforced polyurethane rigid foam composite sheet specification: 240mm×50mm×3000mm. Parameter setting of crawler lamination host: running speed: 0.6m / min, temperature: 90°C / 60°C. Mechanically grind one of the composite boards to a thickness of 40mm, use fiv...

Embodiment 3

[0085] In terms of parts by mass, the formula of the polyurethane resin and the ratio of the polyurethane resin to the reinforcing fiber are as follows: 90 parts of polyether polyol A with a hydroxyl value of 400-480 and a functionality of 1-3, a hydroxyl value of 60-160 and a functionality of 1-2 5 parts of polyether polyol B, 15 parts of flame retardant, 5 parts of rigid foam stabilizer, 10 parts of coupling agent, 0.2 part of catalyst, 0.3 part of foaming agent, 0.5 part of antioxidant, 0.5 part of anti-ultraviolet agent, 115 parts of isocyanate; 520 parts of long fiber, 5 parts of chopped fiber, and 1 part of fiber mat. Among them, the reinforcing fiber content is 68.5%, and the production density is 1000±50Kg / m 3 Fiber-reinforced polyurethane rigid foam composite sheet specification: 500mm×30mm×3000mm. Parameter setting of crawler lamination host: running speed: 0.5m / min, temperature: 90°C / 70°C. The composite board of 500mm×30mm is machined into a composite board of 250...

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Abstract

The invention relates to a fiber-reinforced rigid polyurethane foam synthesis sleeper with the high fiber content and a manufacturing method of the sleeper. The sleeper is formed by bonding multiple fiber-reinforced rigid polyurethane foam synthesis boards with the high fiber content through a bonding agent, an anti-corrosive paint film is arranged on the outer surface of the sleeper, and the fiber-reinforced rigid polyurethane foam synthesis boards with the high fiber content use polyurethane resin and reinforced fibers as base materials. Various technological measures such as mixed type polyether polyol with the low hydroxyl value and the low functionality degree and a coupling agent are adopted, the problem that the polyurethane resin and the reinforced fibers are not sufficiently impregnated is solved, so that the content of the reinforced fibers is increased, a fiber-reinforced rigid polyurethane foam material product with the density higher than 840 kg / m<3> and the content of the reinforced fibers larger than 60% can be manufactured, the technological blank of the fiber-reinforced rigid polyurethane foam synthesis boards is filled up, the standards and the performance of the product of the boards are diverse, and the requirements for different technical indexes are met.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a high-fiber-content fiber-reinforced polyurethane hard foam synthetic sleeper used in the fields of heavy-duty railways, high-speed railways, railway bridges, ordinary railways, light rail subways, and ordinary plank roads. The preparation method thereof can also be extended to fields such as municipal construction, chemical industry, ships, armored vehicles, trucks and the like to be used as walkway boards. Background technique [0002] Sleepers are a kind of railway accessories and play a vital role in railway construction. In the track structure, the role of the sleeper is to bear the load, lateral force and longitudinal horizontal force transmitted from the rail, and spread it evenly on the track bed. At the same time, the sleeper also plays the role of maintaining the direction, gauge and position of the rail. Therefore, the sleeper is requi...

Claims

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Application Information

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IPC IPC(8): E01B3/44C08G18/48
CPCC08G18/4804E01B3/44C08G2110/0025C08G18/48B29C70/081B29C70/18B29K2075/00B29C70/54B29C44/322C08J9/0085B29C70/28C08G18/14C08G18/4829C08J5/041C08J5/042C08J5/043C08J5/046
Inventor 牛斌沙磊曾志斌牛嘉禾范霆高健
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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