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Integral polyurethane foaming synthetic sleeper and preparation method thereof

A polyurethane, integrated technology, applied in the field of polyurethane composite materials, can solve the problems of high cost, poor product performance, exposed rebar, etc., and achieve the effect of fewer processes and excellent product mechanical properties.

Pending Publication Date: 2021-12-28
ZHUZHOU TIMES NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Poor product performance: bonded sleepers are prone to fatigue cracking at the bonded parts;
[0007] (2) The safety of use is not high: the bonded sleeper is prone to fatigue and cracking, and it needs to be reinforced with threaded steel in the longitudinal direction. During actual installation, it is necessary to drill holes and slots on the sleeper, which is easy to expose the threaded steel. After the rail is powered on, it is easy to Risk of electric leakage
[0008] (3) High cost: Bonded sleepers first need to produce plates, and then brush and polish the plates to a fixed thickness for plate bonding. Each plate should also be drilled and injected with adhesive, and multiple plates should be bonded with rebar. The connection is enhanced, the process is complicated and the cost is high

Method used

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  • Integral polyurethane foaming synthetic sleeper and preparation method thereof
  • Integral polyurethane foaming synthetic sleeper and preparation method thereof
  • Integral polyurethane foaming synthetic sleeper and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for preparing integral polyurethane foam synthetic sleepers, comprising the following raw materials:

[0047]1) The continuous fiber (glass fiber) is 19200Tex, and the mass ratio of continuous fiber is 50%.

[0048] 2) Polyurethane resin, the proportion is as follows: Polyether polyol component 1 (glycerol-propylene oxide polyether, average functionality 3, hydroxyl value 410mKOH / g, viscosity 320mp.s (25°C)): 100 parts , polyether polyol component 2 (sorbitol-propylene oxide polyether, average functionality 6, hydroxyl value 550mKOH / g, viscosity 1200mp.s (25°C)): 100 parts, catalyst 1 (triethylene Diamine): 6 parts, catalyst 2 (dibutyltin dilaurate): 2 parts, foaming agent water: 2 parts, foam stabilizer (organosiloxane-polyether copolymer): 2 parts, flame retardant (tris(2-chloroethyl)phosphate): 1 part, isocyanate (diphenylmethane diisocyanate, NCO content 30.4%, average functionality 2.5): 260 parts.

[0049] When foaming polyurethane resin, mix polyether ...

Embodiment 2

[0057] The specific production process of this implementation case is as follows:

[0058] a. Preheating the steel belt laminator in advance: The steel belt laminator adopts three-stage preheating, and the temperatures of the front, middle and back three stages are 45°C, 65°C, and 45°C respectively.

[0059] b. Yarn arrangement: According to the product density and product size, the continuous fiber threading arrangement is carried out. The continuous fiber used is glass fiber, the yarn type is 19200TEX, and the number of yarns is 800;

[0060] c. Pulling head traction: press the steel belt laminator against the leading head, then the laminator rotates, and the yarn is driven into the cavity of the laminating machine through the leading head. The traction speed of the laminator is 0.7m / min;

[0061] d. Glue injection: start the polyurethane glue injection machine, pour polyurethane resin on the yarn through the glue injection tube. The glue injection flow rate is controlled ...

Embodiment 3

[0070] A method for preparing integral polyurethane foam synthetic sleepers, comprising the following raw materials:

[0071] 1) The continuous fiber (glass fiber) is 19200Tex, and the mass ratio of continuous fiber is 62%.

[0072] 2) The resin ratio is as follows: Polyether polyol component 1 (glycerol-propylene oxide polyether, average functionality 3, hydroxyl value 410mKOH / g, viscosity 320mp.s (25°C)): 100 parts, poly Ether polyol component 2 (sorbitol-propylene oxide polyether, average functionality 6, hydroxyl value 550mKOH / g, viscosity 1200mp.s (25°C)): 100 parts, catalyst 1 (triethylenediamine ): 6 parts, catalyst 2 (dibutyltin dilaurate): 2 parts, foaming agent water: 1 part, foam stabilizer (organosiloxane-polyether copolymer): 2 parts, flame retardant (three (2-chloroethyl)phosphate): 1 part, isocyanate (diphenylmethane diisocyanate, NCO content 30.4%, average functionality 2.5): 250 parts.

[0073] The specific production process of this implementation case is a...

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Abstract

The invention relates to an integral polyurethane foaming synthetic sleeper and a preparation method thereof. The integral polyurethane foaming synthetic sleeper comprises polyurethane resin. The polyurethane resin comprises the following raw materials: 90-110 parts of a polyether polyol component 1, 90-110 parts of a polyether polyol component 2, 5-10 parts of a catalyst 1, 0-3 parts of a catalyst 2, 0-2 parts of a foaming agent, 1-3 parts of a foam stabilizer, 1-3 parts of a flame retardant and 200-300 parts of isocyanate. The polyether polyol component 1 is glycerol-epoxypropane polyether, the polyether polyol component 2 is sorbitol-epoxypropane polyether, the catalyst 1 is a tertiary amine catalyst with a double-heterocyclic structure, the catalyst 2 is an organic tin compound, and the isocyanate is diphenylmethane diisocyanate. According to the invention, the processing property and the performance of the product can be effectively improved, production cost is reduced, and product quality is improved.

Description

technical field [0001] The invention belongs to the technical field of polyurethane composite materials, and in particular relates to an integral polyurethane foam synthetic sleeper and a preparation method thereof. Background technique [0002] The sleepers used in railway traffic are mainly concrete sleepers and wooden sleepers. The concrete sleepers are extremely difficult to install and construct because of their heavy weight. The biggest problem facing wooden sleepers is that the supply of high-quality wood for railway sleepers continues to decline. Another growing problem is the impact on the environment and health of sleepers using chemical preservatives. The railway industry has historically used creosote to impregnate wooden sleepers. In the near future, chemical preservative sleepers may require specific treatment procedures, and wooden sleepers will gradually be abolished and replaced. [0003] Foreign research on alternative materials for wooden sleepers mainly ...

Claims

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Application Information

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IPC IPC(8): C08G18/48C08G18/24C08G18/20C08K5/521C08K7/14B29C44/02B29C70/52C08G101/00
CPCC08G18/4816C08G18/165C08G18/246C08G18/2063C08K5/521C08K7/14B29C70/521B29C44/02C08G2110/0083Y02A30/30
Inventor 杨海孙湘民王明星陈彦北李再轲刘刚卢瑞林陈增红吕文丽
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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