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Foaming polyurethanes elastomer, manufacturing method thereof and pallet for railway

A technology of foaming polyurethane, manufacturing method, applied in the field of foaming polyurethane elastomer, to achieve the effects of good compression characteristics, good fatigue resistance, and low water absorption

Inactive Publication Date: 2010-11-17
NIPPON POLYURETHANE IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, even the foamed polyurethane elastomer formed by the method of Patent Document 5 using the mechanical foam foaming method is not a product that satisfies all of the above-mentioned performances (1) to (6) in a balanced manner, and there is still a need for further improvement.

Method used

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  • Foaming polyurethanes elastomer, manufacturing method thereof and pallet for railway
  • Foaming polyurethanes elastomer, manufacturing method thereof and pallet for railway
  • Foaming polyurethanes elastomer, manufacturing method thereof and pallet for railway

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] (1) Preparation of isocyanate-terminated prepolymer (A)

[0114] In a reaction vessel with a capacity of 1000 mL equipped with a stirrer, a cooling pipe, a nitrogen inlet pipe and a thermometer, add 100.0 parts by mass of MDI (containing a mixture of isomers composed of 2,2'-MDI and 2,4'-MDI Diphenylmethane diisocyanate with a content ratio of 1 mass % or less and a 4,4'-MDI content ratio of 99 mass % or more), and poly(oxytetraethylene diisocyanate) with a nominal average functional group number of 2 and a number average molecular weight of 2000 Methyl) polyol 165.9 mass parts, stirred 4 hours at 80 ℃, carried out urethanation reaction, obtained NCO content 10.0 mass %, the isocyanate group terminal prepolymer (A) of average functional group number 2.0 (hereinafter referred to as " prepolymer (A-1)").

[0115] (2) Preparation of polyol mixture

[0116] According to the formulation shown in the following Table 1, 13.64 parts by mass of polyol (B) (the EO-terminated po...

Embodiment 2～6

[0120] According to the formula shown in the following table 1, 13.64 parts by mass of polyol (B), 1,4-butanediol (C1), ethylene glycol (C2), diglycerin (C3), 9.09 parts by mass of foam stabilizer , and 0.01 parts by mass of a tin-based catalyst (DOTDL) were mixed to obtain a polyol mixture. Hereinafter, they are respectively referred to as "polyol mixture (B-2)" to "polyol mixture (B-6)".

[0121] Then, except that the polyol mixture (B-2)-(B-6) was used instead of the polyol mixture (B-1) as the polyol mixture mixed with the prepolymer (A-1), the remaining 1(3) Similarly, the foamed polyurethane elastomer of the present invention (molded product of 140 mm×180 mm×10 mm) was formed and taken out from the mold.

Embodiment 7～8

[0146] According to the formula shown in the following table 3, polyol (B), 1,4-butanediol (C1), ethylene glycol (C2), diglycerin (C3), foam stabilizer, tin catalyst (DOTDL ) are mixed to obtain a polyol mixture. These are hereinafter referred to as "polyol mixture (B-7)" and "polyol mixture (B-8)", respectively.

[0147] Then, except that the polyol mixture (B-7) and (B-8) were used instead of the polyol mixture (B-1) as the polyol mixture mixed with the prepolymer (A-1), the rest were the same as in Example 1(3) Similarly, the foamed polyurethane elastomer of the present invention (molded product of 140 mm×180 mm×10 mm) was formed and taken out from the mold.

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Abstract

The present invention provides a kind of foaming polyurethane elastomer which meets equilibrium the low spring constant of antishock and buffering performance, and has favorable compression performance, high mechanism intension, little compression permanence distortion, good fatigue resistance, low water absorption rate. The mentioned elastomer is made through the spumescence material solidify inthe forming mould, the mentioned spumescence amterial is made through the mechanism mixing of the elastomer formation compound under the atmosphere of inert gases. The raw material includes (A) NCO radicle terminal prepolymer, (B) polyols with number-average molecular weight 500~6000, and (C) chain growth agent containing 1,4-butanediol, ethylene glycol, digllycerol; the quality rate [(B) / (C)] is5 / 95~25 / 75; among the chain growth agent, the quality rate of the 1,4-butanediol is 5%~42%, the quality rate of the ethylene glycol is 30%~77%, the quality rate of the digllycerol is 17%~36%, The molrate ([NCO] / [OH]) of the elastomer formation compound is 0.80~1.20.

Description

technical field [0001] The present invention relates to a foamed polyurethane elastic body suitable for use as a constituent material of railroad backing plates and the like, and a method for producing the same. Background technique [0002] Railroad track pads are used as anti-vibration members for damping vibrations and noises generated when vehicles are running in railroad tracks (railways). [0003] The railway backing plate includes a track backing plate inserted between rails and crossties, a backing plate for crossties laid under the crossties, a vibration-proof member for a track plate laid under a slab of a slab track, and the like. [0004] The constituent materials of the railway backing plate require not only (1) a low spring constant suitable for the service conditions to exhibit good vibration-proof performance and cushioning performance, but also (2) good compression characteristics (especially small residual deformation, Low hysteresis loss), (3) high mechan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/10C08G18/48E01B9/68C08G101/00
Inventor 山田卓大森直之矢口仁史高桥浩一饭田登入山俊彦
Owner NIPPON POLYURETHANE IND CO LTD
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