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Water swelling polyurethane elastomer sealing product material and preparation method

A water-swellable, elastic body technology, applied in chemical instruments and methods, and other chemical processes, can solve the problems of reduced expansion ratio, low cross-linking density of carrier rubber, loss, etc., and achieve stable water resistance and excellent mechanical properties , the effect of low quality loss

Active Publication Date: 2009-10-28
NORTHWEST RUBBER & PLASTIC RES & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of material is prone to the following problems due to its structural characteristics: 1. The water-swellable elastomer filled with water-absorbing materials. churn in body network
After long-term or repeated immersion in water, there may be a continuous loss of quality and a decrease in expansion ratio
2. Water-swellable elastomers filled with water-absorbent materials generally have a low cross-linking density to meet the expansion requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] formula:

[0033] (A) Hydrophilic polyether polymer polyol

[0034] Propylene oxide, ethylene oxide copolyether 100 parts

[0035] (B) Polyisocyanate

[0036] Toluene diisocyanate (TDI) 18.5 parts

[0037] (C) Chain extension cross-linking agent

[0038] 1.4 butanediol 2.1 parts

[0039] 4 parts of dichlorodiaminodiphenylmethane (MOCA)

[0040] Dimethylthiotoluenediamine (DMTDA) 2 parts

[0041] Its preparation method:

[0042] For dehydration of 10kg polyether polymer polyol, vacuum dehydration is carried out at a temperature of 110-120°C until the water content is less than 0.5‰. When cooling to 70°C, add 1.85kg of toluene diisocyanate, control the reaction temperature between 80-85°C, and react for 2 hours under stirring to obtain a prepolymer; take 1000g of the prepolymer at a temperature of 100°C with Chain-extending cross-linking agent butanediol 21g, dichlorodiaminodiphenylmethane 40g, dimethylthiotoluenediamine 20g are mixed by manual pouring method, stirr...

Embodiment 2

[0044] formula:

[0045] (A) Hydrophilic polyether polymer polyol

[0046] Tetrahydrofuran, ethylene oxide copolyether 100 parts

[0047] (B) Polyisocyanate

[0048] 29 parts of diphenylmethane diisocyanate (MDI)

[0049] (C) Chain extension cross-linking agent

[0050] 1.4 butanediol 6 parts

[0051] Trimethylolpropane 1.1 parts

[0052] Its preparation method:

[0053] For the dehydration of 200kg polyether polymer polyol, under the temperature condition of 120-130°C, carry out vacuum dehydration for 1 hour until the water content is less than 0.5‰. When cooling to 60°C, add 58kg of diphenylmethane diisocyanate, control the reaction temperature between 75-80°C, and react under stirring for 2 hours to prepare a prepolymer. Take the prepolymer and transfer it to the prepolymer storage tank of the polyurethane elastomer pouring machine, set the temperature at 100°C; mix 1.4 butanediol and trimethylolpropane in a ratio of 6:1.1 in the crosslinking agent storage tank of th...

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Abstract

The invention relates to a water swelling polyurethane elastomer sealing product material and a preparation method. The material is prepared from the following three components (A), (B) and (C) through polymerization reaction of two steps, the elastomer material has water swelling property, and a main chain structure of material molecules absorbs water, wherein the (A) is hydrophilic polyether type polymer1polyol; the (B) is polyisocyanates; and the (C) is low-molecular polyol and amino chain-extended crosslinker. The molar ratio of the (B) to the (A) in an isocyanate end capping reaction is 1.3 to 2.8; and the molar ratio of a product of the isocyanate end capping reaction of the (A) and the (B) to the (C) in a chain-extended crosslinking reaction is 0.75 to 1.05. In the preparation method for the material, the reaction of the two steps is a reaction process of liquid polymerization, and the production of a product is an elastomer casting-molding process. The material has the characteristics of small mass variation rate and stable physical performance after the material absorbs the water repeatedly to swell, and permanent compression deformation and small stress relaxation.

Description

1. Technical field [0001] The invention relates to a polyurethane water-swellable elastomer sealing product material and a preparation method. Specifically, it is a water-swellable elastic body water-swellable sealing material and product and its preparation method. Its main application is the waterproof sealing of water-swellable elastic body in underground engineering. A particularly prominent application case is the shield in the tunnel construction of the shield method Watertight sealing of the water-swellable elastomeric material of the structural segment. 2. Background technology [0002] Water-swellable elastomer is an elastomer material that not only has the rebound performance of general rubber but also has the characteristic of water-absorbing volume expansion after contact with water. Water-swellable elastomers are divided into two types according to their water-absorbing structure: the first type is filler water-absorbing type, which is made by adding water-abso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/10C08G18/76C08G18/48B29C39/02
Inventor 郑健敏杨红都
Owner NORTHWEST RUBBER & PLASTIC RES & DESIGN INST CO LTD
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