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Preparation method of water-expandable single-component polyurethane sealant

A polyurethane sealant, water-swellable technology, applied in polyurea/polyurethane adhesives, chemical instruments and methods, adhesives, etc., can solve the problems of slow water absorption rate, low expansion rate, slow expansion rate, etc., to achieve bonding The effect of good performance, adjustable expansion ratio and excellent expansion performance

Active Publication Date: 2012-04-11
GUANGDONG PUSTAR SEALED RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because it works by the water-absorbing groups on the molecular chain, it has the disadvantages of slow water absorption rate, slow water expansion rate and low expansion ratio.

Method used

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  • Preparation method of water-expandable single-component polyurethane sealant

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Effect test

Embodiment 1

[0058] A preparation method for water-swellable one-component polyurethane sealant, comprising the following steps:

[0059] Step 1: Preparation of water-swellable polyurethane prepolymer: 600 g of difunctional ethylene oxide and propylene oxide copolymerized diol with a molecular weight of 2000 and polyoxypropylene triol with a molecular weight of 1000 Add 30g into the reaction kettle, stir and adjust the temperature of the reaction kettle to 100°C. After mixing evenly, remove water for 2.5h under the condition of vacuum degree of 0.095Mpa, and lower the temperature to 80°C. After the temperature is constant, add to the reaction Add 181.2 g of diphenylmethane-4,4'-diisocyanate and 0.001% of dibutyltin dilaurate to the total mass of the above mixture, and react for 2.5 hours to obtain a water-swellable polyurethane prepolymer.

[0060] Step 2: Preparation of water-swellable one-component polyurethane sealant: combine 550 g of the prepared water-swellable polyurethane prepolyme...

Embodiment 2

[0062] A preparation method for water-swellable one-component polyurethane sealant, comprising the following steps:

[0063] Step 1, preparation of water-swellable polyurethane prepolymer: 500 g of polyoxyethylene polyol with a molecular weight of 2000 and 125 g of trifunctional polyoxypropylene triol with a molecular weight of 5000 are added to the reactor, stirred and adjusted for reaction The temperature of the kettle is 110°C. After mixing evenly, remove water for 2.0 hours under the condition of a vacuum of 0.097Mpa, and cool down to 65°C. After the temperature is constant, add 145.2g of diphenylmethane-4 , 4'-diisocyanate, and stannous octoate accounting for 0.002% of the total mass of the above mixture, after reacting for 3.0 hours, a water-swellable polyurethane prepolymer was obtained.

[0064] Step 2, preparation of water-swellable one-component polyurethane sealant: 300 g of the prepared water-swellable polyurethane prepolymer, 200 g of diisodecyl phthalate, 379 g o...

Embodiment 3

[0066] A preparation method for water-swellable one-component polyurethane sealant, comprising the following steps:

[0067] Step 1, preparation of water-swellable polyurethane prepolymer: 600 g of ethylene oxide and tetrahydrofuran copolymerized glycol with a molecular weight of 5000 and 120 g of trifunctional polyoxypropylene triol with a molecular weight of 3000 are added to the reactor, and stirred And adjust the temperature of the reaction kettle to 95°C. After mixing evenly, remove water for 4.5 hours under the condition of vacuum degree of 0.094Mpa, and lower the temperature to 75°C. After the temperature is constant, add 68.9g of toluene diisocyanate to the reaction kettle , and stannous octoate accounting for 0.005% of the total mass of the above mixture, after reacting for 4.5 hours, a water-swellable polyurethane prepolymer was obtained.

[0068] Step 2: Preparation of water-swellable one-component polyurethane sealant: combine 450 g of the prepared water-swellable ...

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Abstract

The invention discloses a preparation method of a water-expandable single-component polyurethane sealant, which comprises the following steps: mixing and dispersing water-expandable polyurethane prepolymer, vacuum-dried plasticizer, filler, thixotropic agent and water-absorbing resin according to the formula amount at 30-50 DEG C under the vacuum degree of not less than 0.092 MPa in a double planetary mixer or tri-roller grinder for 1-4.5 hours; in high-purity nitrogen atmosphere under atmospheric pressure, adding catalyst B, bonding accelerator and moisture remover, uniformly mixing and dispersing; removing micromolecules under the vacuum degree of not less than 0.092 MPa; and mixing for 0.3-1 hour to obtain the water-expandable single-component polyurethane sealant. Compared with the prior art, the water-expandable single-component polyurethane sealant is easy for construction, and has the characteristics of favorable bonding performance for seal interface, high water-expansion speed after moisture curing, adjustable expansion rate and the like.

Description

Technical field [0001] The present invention involves the field of polyurethane sealant technology, especially a preparation method for a polyurethane sealant in a single component of water expansion. Background technique [0002] In recent years, with the increase in investment in infrastructure construction such as subways, railways, tunnels, and highways, the waterproof problem of construction projects has been increasingly valued, because to ensure the life of the construction project, in addition to the strength of the construction concrete structure itself, protection is protected.The erosion of the construction of the building is also a very important part of engineering construction and process maintenance. [0003] In the case of water expansion materials, it is a functional material with dual effects of sealing and water expansion. It is widely used in underground construction engineering, house construction, dam construction, tunnel construction, tap water transportati...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09K3/10C08G18/48
Inventor 靳晓雨李桂妃王宇旋
Owner GUANGDONG PUSTAR SEALED RAYON CO LTD
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