Soft polyurethane foam material for bulk solid consolidation
A technology of soft polyurethane and foam materials, applied in the field of polyurethane materials, can solve the problems of large compression residual strain, low compression permanent deformation, low tensile strength and bonding strength, and achieve excellent durability and excellent physical and mechanical properties Effect
Active Publication Date: 2014-09-10
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +3
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Problems solved by technology
However, the soft polyurethane foam material has low density, large compression residual strain, low tensile strength and bonding strength, so its application has been limited. At present, there is no soft polyurethane foam suitable for granular solidification. Research Report on Polyurethane Foam
Moreover, the manufacturing technology of soft polyurethane foam materials with high density, bonding strength, tear strength, rebound rate, low compression set, anti-aging performance and good flame retardancy still needs to be studied and improved.
Method used
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[0023] The implementation and beneficial effects of the present invention are described below through specific examples, but the present invention is not limited thereto.
[0024] Adjust the temperature of all raw material mixtures (polyol system) and isocyanate to (25±1)°C, respectively, except for isocyanate. Measure the amount of each raw material according to the mixing ratio described in Table 1, then add the isocyanate into the polyol system, and stir and mix with a high-speed mixer at a speed of 3000 rpm for 10 seconds. The newly mixed polyurethane slurry is injected at room temperature into a cylindrical mold with a diameter of 500mm and a height of 500mm that is open at the top and covered with a polyethylene film. After 15 minutes, take out the soft polyurethane foam from the mold, cool it to room temperature (23±2)°C, and then place it in a constant temperature and humidity curing box with a relative humidity of 50% and a temperature of (23±1)°C for 48 hours before ...
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Abstract
The inventive soft polyurethane foam material for bulk solid consolidation is prepared from polyol, isocyanate, catalyst, cross-linking agent, foaming agent, foam stabilizer, antioxidant and flame retardant by proportionally mixing and reacting. The soft polyurethane foam material is characterized in that the polyol has average functionality of 2-6 and average molecular weight of 3,000-10,000, and includes at least partially polyoxyalkylene polyol with high molecular weight of 6,000-12,000. The soft polyurethane foam material has the characteristics of high density, bonding strength, tearing strength and resilience, and low compression permanent deformation; and is suitable for soft consolidation of bulk solid such as railway ballast and graded broken stones for road.
Description
technical field [0001] The invention relates to the field of polyurethane materials, in particular to a soft polyurethane foam material used for the consolidation of granular bodies, and is especially suitable for the flexible consolidation of granular bodies such as railway track ballast and road graded gravel. Background technique [0002] With the development of science and technology and the improvement of social productivity, high speed, safety, comfort and heavy load have become the main development direction of railway and road transportation. However, the ballast track of traditional railways has problems such as ballast wear, serious pulverization, and large deformation of the ballast bed; the graded gravel of existing roads also has the same deterioration phenomenon. Under the current environmental conditions of intensive transportation and heavy load, These problems are more prominent. How to reduce the workload of maintenance and repair of existing ballast railw...
Claims
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IPC IPC(8): C08G18/76C08G18/48C08K5/06C08L75/08C08G101/00
Inventor 谢永江郑新国李书明翁智财刘竞曾志
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI