Formula for synthesizing crosstie and continuous forming process

A molding process and sleeper technology, applied in the direction of track, ballast layer, construction, etc., can solve the problems of inconvenient continuous operation, unstable product performance, low production efficiency, etc., achieve light weight, excellent mechanical properties, and improve production efficiency effect

Active Publication Date: 2008-12-24
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a formula and continuous molding process for synthetic sleepers. This method overcomes the long production cycle, low production efficiency, inconvenient continuous o

Method used

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  • Formula for synthesizing crosstie and continuous forming process
  • Formula for synthesizing crosstie and continuous forming process
  • Formula for synthesizing crosstie and continuous forming process

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1:

[0027] Polyurethane resin foam formulation: polyether polyol 1 (hydroxyl number 3-8, molecular weight below 1300) 90, polyether polyol 2 (hydroxyl number 2 to 3, molecular weight 2000-4000) 10, catalyst 0.01 , Hard foam silicone oil 0.5, foaming agent 0.2, flame retardant 5, antioxidant 0.1, isocyanate 200.

[0028] Continuous molding process parameters: operating speed 0.3m / min

[0029] Pouring amount 3kg / min

[0030] Total length of forming mold 20m

[0031] Forming die section 230mm×70mm

[0032] Molding temperature 80℃

[0033] According to the continuous molding process of the present invention, the properties of the synthetic sleepers prepared after setting the above parameters are shown in the following table.

[0034]

Example Embodiment

[0035] Example 2:

[0036] Polyurethane resin foam formulation: polyether polyol 1 (hydroxyl number 3-8, molecular weight below 1300) 80, polyether polyol 2 (hydroxyl number 2 to 3, molecular weight 2000-4000) 20, catalyst 0.05 , Hard foam silicone oil 2, blowing agent 0.5, flame retardant 15, antioxidant 0.3, isocyanate 160.

[0037] Continuous molding process parameters: operating speed 0.5m / min

[0038] Pouring amount 4kg / min

[0039] Total length of forming mold 20m

[0040] Forming die section 200mm×100mm

[0041] Molding temperature 80℃

[0042] According to the continuous molding process of the present invention, the properties of the synthetic sleepers prepared after setting the above parameters are shown in the following table.

[0043]

Example Embodiment

[0044] Example 3:

[0045] Polyurethane resin foam formulation: polyether polyol 1 (hydroxyl number 3-8, molecular weight below 1300) 60, polyether polyol 2 (hydroxyl number 2 to 3, molecular weight 2000-4000) 40, catalyst 0.1 , Hard foam silicone oil 3, blowing agent 1.0, flame retardant 25, antioxidant 0.5, isocyanate 115.

[0046] Continuous molding process parameters: operating speed 0.8m / min

[0047] Pouring amount 6.4kg / min

[0048] Total length of forming mold 20m

[0049] Forming die section 210mm×80mm

[0050] Molding temperature 80℃

[0051] According to the continuous molding process of the present invention, the properties of the synthetic sleepers prepared after setting the above parameters are shown in the following table.

[0052]

[0053] In the above three embodiments, after their respective polyurethane resin foam formulations and continuous molding process parameters are determined, the contin...

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PUM

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Abstract

The invention discloses a formula for a synthetic sleeper and a continuously forming process. The formula for synthesizing the sleeper takes urethane resin and continuous glass fiber as base materials, wherein the formula of the urethane resin foaming material in portion is as follows: 60 to 90 portions of polyether glycol 1(the number of hydroxyl radical are between 3 and 8, and the molecular weight is less than 1,300), 10 to 40 portions of polyether glycol 1(the number of hydroxyl radical are between 2 and 3, and the molecular weight is between 2,000 and 4,000), 0.01 to 0.10 portion of catalyst, 0.5 to 3 portions of form stabilizer, 0.2 to 1.0 portion of foaming agent, 5 to 25 portions of fire retardant, 0.1 to 0.5 portion of antiaging agent and 115 to 200 portions of isocyanate; the continuously forming process comprises five working procedures of thread guiding, resin-impregnation of a foaming machine, uniform dipping, forming and automatic cutting, and the synthetic sleeper prepared by the invention has the advantages of good comprehensive performance, light weight, stable performance, even boundary, good mechanical property and good corrosion resistant property.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a formula and a continuous molding process of a synthetic sleeper. Background technique [0002] Synthetic sleepers are made of continuous glass fiber reinforced polyurethane foam composite material, which has the characteristics of light weight, stable performance, excellent mechanical properties and good corrosion resistance. [0003] From the analysis of the idea of ​​continuous glass fiber reinforcement, it can be prepared by extrusion molding or molding. The molding process is simple and feasible, but for batch products, the workload is heavy and the efficiency is low, and continuous production cannot be realized. And The stability of the product is poor. The extrusion process has a small workload and a high yield, which is conducive to achieving uniform internal materials and stable quality. However, from the analysis of the base material, the polyu...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08K7/14B29C70/50B29C44/20B29C73/00E01B3/44
Inventor 张用兵陈韶章苏贤锋王满昌刘浪静魏红星
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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