Method for manufacturing polyurethane bridge support

A processing method and polyurethane technology, applied in bridges, bridge parts, bridge construction, etc., can solve the problems of poor dynamic mechanical properties, large residual deformation, poor mechanical properties, etc., and achieve low sliding friction coefficient, reduced residual deformation, The effect of improved fatigue resistance

Inactive Publication Date: 2014-08-06
CHONGQING CINWO PLASTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this compression or pressure bearing, since the iron plate is arranged in the middle of the rubber body of the compression or pressure bearing, the iron plate also greatly reduces the elastic effect of the rubber while playing a load bearing role, and the dynamic mechanical properties are poor; in addition , the aging resistance and low temperature performance of rubber materials are poor, due to the poor mechanical properties of rubber materials, the fatigue performance of compression or pressure bearing products is poor, and the residual deformation is large; and the production method of vulcanization leads to pollution and energy consumption Larger, higher cost, and often due to uneven mixing of the mixed colloids, resulting in unstable product quality

Method used

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  • Method for manufacturing polyurethane bridge support
  • Method for manufacturing polyurethane bridge support
  • Method for manufacturing polyurethane bridge support

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The processing method of the polyurethane bridge support of the present embodiment may further comprise the steps:

[0035] A, the preparation of polyurethane elastic layer specifically comprises:

[0036] a, polyol dehydration: dehydrate the polyol to make it contain 0.05% water; the polyol is polytetramethylene glycol;

[0037] b. Preparation of prepolymer: react the dehydrated polyol prepared in a with excess isocyanate to generate prepolymer A containing 15% -NCO group, the viscosity of the prepolymer is 450mPa·s; the isocyanate is toluene di isocyanate;

[0038] c. Prepare the mixture: fully stir the polyol and auxiliary agent prepared in a to obtain a uniformly mixed mixture B. The auxiliary agent includes a chain extension crosslinking agent, a catalyst and a pigment. The viscosity of the obtained mixture B at the processing temperature is 260mPa ·s; wherein the chain-extending cross-linking agent is 3,3'-dichloro-4,4'-diaminodiphenylmethane. In this step, a m...

Embodiment 2

[0045] The processing method of the polyurethane bridge support of the present embodiment may further comprise the steps:

[0046] A, the preparation of polyurethane elastic layer specifically comprises:

[0047] a, polyol dehydration: dehydrate the polyol to make it contain 0.04% water; the polyol is polytetramethylene glycol;

[0048]b. Preparation of prepolymer: react the dehydrated polyol prepared in a with excess isocyanate to generate prepolymer A containing 20% ​​-NCO groups, the viscosity of the prepolymer is 420mPa·s; the isocyanate is toluene di isocyanate;

[0049] c. Prepare the mixture: fully stir the polyol and auxiliary agent prepared in a to obtain a uniformly mixed mixture B. The auxiliary agent includes a chain extension crosslinking agent, a catalyst and a pigment. The viscosity of the obtained mixture B at the processing temperature is 250mPa ·s; wherein the chain-extending cross-linking agent is 3,3'-dichloro-4,4'-diaminodiphenylmethane. In this step, a...

Embodiment 3

[0056] The processing method of the polyurethane bridge support of the present embodiment may further comprise the steps:

[0057] A, the preparation of polyurethane elastic layer specifically comprises:

[0058] a, polyol dehydration: dehydrate the polyol to make it contain 0.03% water; the polyol is polytetramethylene glycol;

[0059] b. Preparation of prepolymer: react the dehydrated polyol prepared in a with excess isocyanate to generate prepolymer A containing -NCO group 18%, the viscosity of the prepolymer is 600mPa·s; the isocyanate is toluene di isocyanate;

[0060] c. Prepare the mixture: fully stir the polyol and auxiliary agent prepared in a to obtain a uniformly mixed mixture B. The auxiliary agent includes a chain extension crosslinking agent, a catalyst and a pigment. The viscosity of the obtained mixture B at the processing temperature is 180mPa ·s; wherein the chain-extending cross-linking agent is 3,3'-dichloro-4,4'-diaminodiphenylmethane. In this step, a m...

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Abstract

The invention discloses a method for manufacturing polyurethane bridge support. The method mainly includes dewatering polyhydric alcohol, preparing prepolymer, preparing mixture, performing mixing reaction, pouring for formation, demolding, performing post-vulcanization, and bonding. Compared with conventional rubber bridge support, the bridge support manufactured by the inventive method adopts polyurethane material, adopts large adjustable range of the polyurethane material to meet elastic deformation requirement via adjusting hardness, adopts good mechanical property of the polyurethane material to improve fatigue resistance performance, greatly reduces residual deformation quantity and has long service life; in addition, the invention performs product manufacture by adopting pouring formation method to the polyurethane material, the obtained product has stable quality, low contamination, low energy consumption and greatly saved manufacturing cost; and at the same time, the invention adopts polytetrafluoroethylene material or fills polytetrafluoroethylene material to manufacture sliding anti-wear layer, has small sliding friction coefficient, and is in favor of tightly pressing or bearing sliding between the support and box body during bearing force.

Description

technical field [0001] The invention relates to a device accessory in the field of bridges, in particular to a processing method for compression or pressure-bearing support of bridge expansion devices. Background technique [0002] The bridge expansion device is an important component of the bridge structure. It is a general term for various devices installed at the joints of the bridge deck in order to allow vehicles to pass through the bridge deck smoothly and meet the deformation needs of the bridge deck. Modular bridge expansion device refers to the support structure mainly composed of special-shaped steel or steel components and elastic components, which can be assembled into a series of products with different specifications of expansion and contraction according to needs. Its elastic components mainly include elastic parts such as pressure bearings, compression supports, shear springs, and compression control springs. In the prior art, the compression or pressure bea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C39/02B29C39/44C08G18/65C08G18/66C08G18/10E01D19/06E01D101/40
Inventor 孙立炜廖鸿鸣
Owner CHONGQING CINWO PLASTICS
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