Polyurethane soft foam material for curing ballast bed and preparation method thereof
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A polyurethane soft foam and ballast bed technology, applied in the field of catalysts, can solve problems such as environmental protection defects, inability to ensure ballast uniformity, prolong construction time, etc., and achieve excellent physical properties
Active Publication Date: 2016-01-13
ZHEJIANG HUAFENG SPANDEX +1
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However, during the construction process, in order to ensure the stability of the activity of the raw materials in the ballast, drying equipment was used to control the temperature of the ballast, which greatly reduced the construction efficiency and prolonged the construction time, and it was impossible to ensure the temperature stability of the ballast at different depths. unity
At the same time, during the construction process, there is a problem that the viscosity of the raw material is high and it is difficult to penetrate into the ballast
In addition, the additive catalyst selected in the formula may pollute the groundwater, which has great defects in environmental protection.
[0007] At present, whether it is polyurethane ballast glue or polyurethane soft and hard foam, the actual outdoor use environment has not been fully considered
Method used
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Embodiment 1 and 2
[0061] (1) Preparation of material A:
[0062] Stir polyether polyol and small molecule chain extender at a temperature of 60°C for 2 hours, then add foaming agent, continue stirring for 2 hours, and filter to obtain material A;
[0063] (2) Preparation of material B:
[0064] Every 30 minutes, add polyether polyol to isocyanate and mix, continue to react after adding, react at 90°C for 1 hour, filter to obtain material B;
[0065] (3) Premixing of material A and material C: mix the mixed material A and catalyst C in a separate material tank for use;
[0066] (4) Mix the mixture of material A and material C and material B uniformly through a high-pressure foaming machine to prepare a flexible polyurethane foam material.
Embodiment 3，4 and 5
[0068] (1) Preparation of material A:
[0069] Stir polyether polyol and small molecule chain extender at a temperature of 45°C for 3 hours, then add foaming agent, continue stirring for 3 hours, and filter to obtain material A;
[0070] (2) Preparation of material B:
[0071] Every 30 minutes, add polyether polyol to isocyanate and mix, continue to react after adding, react at 70°C for 3 hours, filter to obtain material B;
[0072] (3) Premixing of material A and material C: mix the mixed material A and catalyst C in a separate material tank for use;
[0073] (4) Mix the mixture of material A and material C and material B uniformly through a high-pressure foaming machine to prepare a flexible polyurethane foam material.
[0074] Comparative example 1 process condition is identical with embodiment 1, and comparative example 2 is identical with embodiment 3.
[0075] Molded sample preparation:
[0076] Adjust the temperature of material A and material B to (25±1)°C. Coat a...
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Abstract
The invention discloses a polyurethane soft foam material for curing ballast beds and a preparation method thereof. The polyurethane soft foam material is prepared from following raw materials: a material A, a material B and a catalyst material C, wherein the material A includes the following raw materials: polyether polyol, a small-molecular chain extender and a foaming agent; the material B is a pre-polymer prepared from isocyanate and polyether polyol; the material C is a catalyst and the weight ratio of the material C to the material A is 1.2-1.4:100. The catalyst is stannous ricinelaidate. In a moulded sample being not more than 350 kg/m<3> in density, the polyurethane soft foam is not less than 0.6 MPa in tensile strength, is not less than 200% in break elongation rate, is not less than 500 N/m in tear strength and is not less than 25 kPa in compression strength. The polyurethane soft foam material has excellent deformation recovery situation with compression set being not more than 10% and satisfies an aging standard, has more convenient construction advantages on the basis of activity and foam rising height of materials being casted in railway ballasts at different temperatures.
Description
technical field [0001] The invention relates to a flexible polyurethane foam material for a polyurethane solidified ballast bed and a preparation method thereof, in particular to a catalyst. Background technique [0002] In recent years, new polyurethane foam materials have been gradually applied to the curing bonding of traditional ballasted tracks. Compared with the unsaturated resin composition, polyurethane and other adhesives that have been developed for fixing ballast, the polyurethane flexible foam material not only has considerable mechanical properties, recovery ability, and bonding ability, but also has energy absorption and shock absorption. role. Therefore, polyurethane soft foam materials have broad application prospects due to their superior durability, energy absorption performance, damping performance, and high cost performance. [0003] At present, polyurethane cured ballast bed is mainly researched and applied in Germany and China. There are more than 4 ...
Claims
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