Urethane acrylate grouting material capable of repeatedly re-expanding when meeting water and preparation method thereof
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A technology of polyurethane acrylate and grouting material is applied in the field of chemical grouting for plugging and waterproofing, which can solve the problems of poor strength and environmental adaptability.
Inactive Publication Date: 2010-08-11
GUANGZHOU CHEM GROUTING CO LTD CAS
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Problems solved by technology
[0004] The technical problem to be solved in the present invention is to provide a polyurethane acrylate grouting material that can repeatedly expand with water and its preparation method in view of the existing water-swellable water-blocking materials with poor strength and environmental adaptability.
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Embodiment 1
[0045] Preparation of Polyurethane Prepolymer
[0046] Add 100 parts of hydrophilic active polyether polyols into a four-necked flask equipped with a thermometer and a stirrer, dehydrate at a temperature of 120°C and a pressure of -0.098MPa for 2 to 3 hours until no bubbles come out, and then cool down to 50°C, nitrogen protection, add 2 drops of dibutyltin dilaurate and 4 drops of tartaric acid, stir evenly, add 27 parts of TDI dropwise, dropwise for 20 minutes, and keep at this temperature for 30 minutes, then raise the temperature to 80°C, keep About 3 hours, use the dibutylamine method to measure the isocyanate content, stop the reaction when it reaches the theoretical content, cool down to 45°C, add 15 parts of acetone to reduce the viscosity, stir evenly, discharge, and seal the package.
[0047] Preparation of polyurethane acrylate
[0048] Add 100 parts of the above-prepared polyurethane prepolymer into a four-necked flask equipped with a thermometer and a stirrer, ra...
Embodiment 3
[0054] Preparation of Polyurethane Prepolymer
[0055] Add 80 parts of hydrophilic active polyether polyols, 10 parts of polyethylene glycol 1000, and 10 parts of N330 into a four-necked flask equipped with a thermometer and a stirrer at a temperature of 120 °C and a pressure of -0.098 MPa for 2 to 3 Hours, until no bubbles come out, cool down to 50°C, pass through nitrogen protection, stir evenly, add 33 parts of TDI dropwise, finish adding dropwise in 20 minutes, and keep at this temperature for 30 minutes, then raise the temperature to 80°C, keep for about 3 hours , use the dibutylamine method to measure the isocyanate content, stop the reaction when it reaches the theoretical content, cool down to 45°C, stir evenly, discharge the material, and seal the package.
[0056] Preparation of polyurethane acrylate
[0057] Add 100 parts of the above-prepared polyurethane prepolymer into a four-necked flask equipped with a thermometer and a stirrer, heat up to 50°C, add a small am...
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Abstract
The invention discloses a urethane acrylate grouting material capable of repeatedly re-expanding when meeting water and a preparation method thereof. The preparation method comprises the following steps of: using diisocyanate and hydrophilic polyether binary alcohol or trihydric alcohol as polyalcohol raw materials to synthesize a polyurethane pre-polymer; performing a reaction on the polyurethane pre-polymer and an alkenyl compound with active hydrogen for end capping; and adding water, an accelerator, cross-linking agents and the like to prepare a component A of a double-component urethane acrylate grouting material capable of re-expanding when meeting water, wherein a component B matched with the component A consists of initiator aqueous solution. In order to further enhance the water meeting expandability of a system, other hydrophilic co-monomers can also be added into the component A. The prepared composite grouting material has certain elasticity and water meeting expandability, the water meeting free swelling ratio which can be adjusted to between 100 percent and 400 percent, a repeated water absorption expansion effect and fewer influences caused by the ion concentration and the pH value, and can solve the problems of repeated leakages in water blocking and preventing projects under various conditions.
Description
technical field [0001] The invention relates to the field of chemical grouting for plugging and waterproofing, in particular to a polyurethane acrylate grouting material that can reexpand upon repeated contact with water and a preparation method thereof. Background technique [0002] Currently used for plugging and waterproofing of underground projects, tunnels, dams, oil fields, etc., most of them use chemical grouting materials such as single-component water-soluble polyurethane, acrylate, and acrylic. The reason why these materials have the effect of blocking water is that they have a certain function of water absorption and swelling. After these slurries are solidified in the cracks, when in contact with water, three kinds of interactions will be formed: one is that water molecules form hydrogen bonds with atoms with strong electronegativity in polymers, such as N and O; The interaction of hydrophilic groups (such as the formation of ion pressure); the third is the inte...
Claims
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