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Weather bar for shield segment and preparation process of weather bar

A technology for the shield segment and its preparation process, which is applied in the field of water retaining strips for the shield segment and its preparation process, and can solve the problems of losing the effect of swelling when encountering water and the inability of molecules to form cross-linking effects, etc.

Inactive Publication Date: 2020-12-11
HENGSHUI MINGGUANG ENG RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: the traditional water-swellable rubber water-stop material mainly uses the hydrophobicity of natural rubber and the water-absorbing swelling property of water-absorbing resin. The water-absorbing resin is white powder, and the main component is sodium polyacrylate, which is mixed with natural rubber. Afterwards, its molecules cannot form cross-linking, and it is in a discrete distribution state in the finished product
When encountering water during shield tunneling construction, due to the effect of osmotic pressure, it will gradually precipitate to the surface of the product, thus losing the effect of water swelling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] The embodiment of the present invention provides a shield segment water retaining strip and its preparation process, including the following raw materials in proportions by weight: 60-80 parts of polyether prepolymer, 20-30 parts of curing agent, Catalyst 0.4-0.7 part. The polyether prepolymer is prepared by copolymerizing glycerol with ethylene oxide and propylene oxide, wherein ethylene oxide accounts for ≧70%, the curing agent is isocyanate, and the catalyst Dibutyltin dilaurate.

[0019] A preparation process for a water retaining strip for a shield segment, comprising the following steps:

[0020] Step 1: The operating temperature of the polyether prepolymer is 75°C-80°C, put it in a reaction kettle not exceeding 80°C and heat it to 75°C-80°C, vacuum it until there is no bubble, and the vacuum degree is controlled at - 0.1Mpa, spare;

[0021] Step 2: Heat the curing agent component to 50°C-60°C, vacuum it until there is no bubble, and control the vacuum degree a...

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PUM

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Abstract

The invention belongs to the technical field of weather bars for shield segments, and particularly relates to a weather bar for shield segments and a preparation process of the weather bar; a novel water-swelling waterproof material replaces a traditional water-swelling rubber water-stopping material. The product comprises the main materials: polyether type prepolymer, a curing agent and a catalyst; after curing molding with a plate curing machine, the product can be cut into any size; the hydrophilicity, the hydrolysis resistance and the excellent processing performance of the polyether prepolymer are mainly utilized, and the product has characteristics of smooth and bright appearance, mirror surface state under illumination, and light reflection. The mechanism comprises that a large number of ether bonds and isocyanate bonds contained in the molecular chain are fused with water to form hydrogen bonds, enough water molecules are physically adsorbed to achieve the effect of swelling inwater, the process is reversible reaction, the molecular chain structure is not damaged after repeated soaking, no precipitate is generated after soaking, and the product has stable performance whenbeing swollen after meeting water.

Description

technical field [0001] The invention belongs to the technical field of water retaining strips for shield tunneling segments, in particular to a water retaining strip for shield tunneling segments and a preparation process thereof. Background technique [0002] Traditional water-swellable rubber water-stop materials are divided into two types: product type and putty type. The materials used are mainly natural rubber, supplemented with water-absorbing resin (expansion powder) and other fillers, and molded (or extruded) after kneading and banburying out) formed by high-temperature vulcanization. It has the advantages of simple processing and preparation technology, low manufacturing cost and high qualified rate of finished products. Its disadvantages are: the traditional water-swellable rubber water-stop material mainly uses the hydrophobicity of natural rubber and the water-absorbing swelling property of water-absorbing resin. The water-absorbing resin is white powder, and th...

Claims

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Application Information

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IPC IPC(8): C08G18/48B29C39/02B29C39/44B29C69/00
CPCC08G18/4837B29C39/02B29C39/44B29C69/00
Inventor 高石仓
Owner HENGSHUI MINGGUANG ENG RUBBER CO LTD