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A low-viscosity non-pressure grouting type crack repair agent and its preparation method

A crack repair, low viscosity technology, applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problem that it is difficult to resist the tensile deformation of concrete structures, it is not suitable for repairing micro cracks, and the operation is not convenient, etc. problems, to achieve the effect of simple and efficient construction, low cost and extended service life

Active Publication Date: 2022-02-01
HUBEI TENGCHEN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, modified epoxy resin products and polyurethane resin products are mainly used as crack repair agents. However, due to the high viscosity of these two types of products, the filling must be completed by pressurized grouting with the help of various mechanical equipment during construction operations. Cracks, because the cracks mainly exist on the surface of the building, when it is high from the ground, high-altitude operations are required, and it is difficult and dangerous to carry and operate pressurized equipment
[0006] CN102924117A discloses a low-viscosity dynamic load structural concrete crack repair agent, which is a two-component adhesive based on bisphenol A epoxy and hydrogenated epoxy, and has the advantages of high bonding strength and high compressive strength, but the reaction time More than 60 minutes, the mixed viscosity exceeds 120cps, the construction process needs to rely on equipment for pressurized grouting, and the operation is not convenient enough
[0007] A kind of fast-curing acrylic structural adhesive disclosed by CN1198460A is a two-component structural adhesive based on vinyl polyurethane and acrylic, which has the advantages of fast curing time and high bond strength, but due to the A transition metal chelating agent needs to be added, and a substituted dihydropyridine needs to be used as a reactive diluent, and the operation and construction are cumbersome
[0008] CN106520051A discloses a high-speed rail track slab crack repair glue and its preparation method. It adopts epoxy resin modified polyurethane, and its bonding strength is less than 3.5MPa. It is difficult to resist the tensile deformation of the later concrete structure, and there is the possibility of secondary cracking. , the product has a high viscosity and cannot penetrate into fine cracks under pressure-free conditions
[0009] CN1247882A discloses a two-component polyurethane building sealant and its production process. Its two-component polyurethane is terminated with NCO, and its viscosity reaches more than 200 cps, but the high viscosity is not suitable for repairing tiny cracks

Method used

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  • A low-viscosity non-pressure grouting type crack repair agent and its preparation method
  • A low-viscosity non-pressure grouting type crack repair agent and its preparation method
  • A low-viscosity non-pressure grouting type crack repair agent and its preparation method

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preparation example Construction

[0043] The present invention also provides a preparation method of a low-viscosity pressureless grouting type crack repair agent, comprising the following steps:

[0044] In parts by weight, mix 35-45 parts of polyether monomers, 25-35 parts of plasticizers and 20-35 parts of solubilizers and mix them evenly. ~25 parts of diluent, 0.5~1 part of anti-aging agent and 0.5~1.5 parts of antifoaming agent are mixed and stirred evenly, and then discharged and packaged to obtain component B.

[0045] When in use, add component A and component B to the hose of the two-component glue gun respectively (the hose with a volume ratio of 1:1 is selected), and the volume ratio of components A and B is 1:1. The two components are mixed through a mixing tube to obtain a repairing agent. The repairing agent is injected into the crack, and the crack is repaired after the repairing agent is completely cured. The repairing agent prepared in this example takes less than or equal to 12 minutes to com...

Embodiment 1

[0054] In the low-speed stirring state with a rotation speed of 50r / min, put polyether monomers: 150 grams of difunctional polyether polyol and 250 grams of trifunctional polyether polyol into the reaction vessel, adjust the speed to 100r / min and stir for 10 minutes Finally, add plasticizer: 200 grams of dimethyl phthalate, 100 grams of butyl benzyl phthalate, stir for 5 minutes and then add solubilizer: 150 grams of dipropylene glycol, 150 grams of dipropylene glycol butyl ether, adjust the speed to Stir continuously at 300r / min for 45min until the material fully reacts and becomes clear. Pour the reacted material into a closed container as component A, and put it in a constant temperature drying box for storage.

[0055] In the low-speed stirring state with a rotation speed of 50r / min, put the curing agent: 400 grams of toluene diisocyanate and 400 grams of diphenylmethane diisocyanate into the reaction vessel, adjust the speed to 100r / min and stir for 20 minutes, then add th...

Embodiment 2

[0060] In the low-speed stirring state with a rotation speed of 50r / min, put polyether monomers: 100 grams of difunctional polyether polyol and 250 grams of trifunctional polyether polyol into the reaction vessel, adjust the speed to 100r / min and stir for 10 minutes Finally, add plasticizer: 150 grams of dimethyl phthalate, 100 grams of butyl benzyl phthalate, stir for 5 minutes and then add solubilizer: 100 grams of dipropylene glycol, 250 grams of dipropylene glycol butyl ether, adjust the speed to Stir continuously at 300r / min for 45min until the material fully reacts and becomes clear. Pour the reacted material into a closed container as component A, and put it in a constant temperature drying box for storage.

[0061] In the low-speed stirring state with a rotation speed of 50r / min, put the curing agent: 350 grams of toluene diisocyanate and 400 grams of diphenylmethane diisocyanate into the reaction vessel, adjust the speed to 100r / min and stir for 20 minutes, then add th...

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Abstract

The invention discloses a low-viscosity non-pressure grouting type crack repairing agent and a preparation method thereof, and relates to the field of concrete structure reinforcement materials. The repairing agent comprises 1 part of component A and 0.9 to 1.1 parts of component B; in parts by weight , the A component includes 35 to 45 parts of polyether monomer, 25 to 35 parts of plasticizer and 20 to 35 parts; B component includes 75 to 85 parts of curing agent, 15 to 25 parts of diluent, 0.5 to 1 Anti-aging agent and 0.5-1.5 parts of defoaming agent; the preparation method of the repairing agent comprises the following steps: mixing 35-45 parts of polyether monomer, 25-35 parts of plasticizer and 20-35 parts of solubilizer and stirring evenly , out of the packaging to get component A; mix 75-85 parts of curing agent, 15-25 parts of thinner, 0.5-1 part of anti-aging agent and 0.5-1.5 parts of defoamer and stir evenly, and get out of the package to get B component . The invention can obtain smaller viscosity, higher bonding strength and shorter reaction time, and is suitable for repairing tiny cracks.

Description

technical field [0001] The invention relates to the field of concrete structure reinforcement materials, in particular to a low-viscosity non-pressure grouting type crack repair agent and a preparation method thereof. Background technique [0002] As a high-strength, durable and economical building material, concrete is widely used in civil engineering such as pavements and buildings. However, the tensile strength of the structure formed by solidification of concrete is weak, and it is easy to crack under the action of external stress. Reinforcement and concrete not only have Approximately the same linear expansion coefficient, and have good cohesion with each other, when used together, the steel bar can provide excellent toughness and pull-out resistance, and the concrete provides good compressive strength, and the combination of the two has good resistance Stress and pressure performance have promoted the production of high-rise buildings and long-span bridges, and have be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/08C09J11/06
CPCC09J175/08C09J11/06C08L2201/08C08L83/04C08K5/00C08K5/3475C08K5/06C08K5/05C08K5/02
Inventor 徐立杨世鹏张俊文
Owner HUBEI TENGCHEN TECH CO LTD