CN117210099A - Tunnel concrete wet surface permeation curing protective material - Google Patents

Abstract

The invention discloses a tunnel concrete wet surface permeation curing protective material, which comprises a component A and a component B; the component A consists of the following components in parts by mass: 20-30 parts of low molecular weight epoxy resin, 1-2 parts of coupling agent, 1-2 parts of defoamer, 1-2 parts of flatting agent, 5-10 parts of flexibilizer, 1-2 parts of accelerator and 40-60 parts of solvent; the component B consists of the following components in parts by mass: 10-15 parts of main curing agent, 2-5 parts of modified curing agent and 20-30 parts of solvent; wherein the mass ratio of the component A to the component B is 2-3: 1 are matched for use. The tunnel concrete wet surface permeation curing protective material can be used for permeation curing film forming on the concrete wet surface, and has certain bonding strength.

Description

Tunnel concrete wet surface permeation curing protective material

Technical Field

The invention relates to the field of tunnel engineering maintenance, in particular to a tunnel concrete wet surface permeation curing protective material.

Background

Since the new century, tunnels in China have entered a rapid development period, and the maintenance demands of tunnels are gradually increasing. The degradation corrosion of the tunnel main body structure tends to extend from the surface to the inner matrix, and under the actions of freeze thawing, dry-wet alternation, carbonization and the like, the tunnel concrete structure in the operation period is easy to generate slight defects such as micro cracks, pores, pitting surfaces, damage and the like; meanwhile, wet stains exist on the surface of part of concrete of the tunnel structure for a long time, particularly an underwater tunnel, a concrete wet basal plane is contacted with air for a long time, the development of slight diseases such as mildew, carbonization and cracking on the surface of the concrete structure can be accelerated, and then internal steel bars, calcium hydroxide, calcium silicate hydrate and the like are gradually corroded, so that the service life of the tunnel concrete is greatly reduced, the damage of the concrete structure is finally caused, the normal operation of the tunnel is influenced, the maintenance cost is increased, and the problem of visible durability cannot be ignored. Therefore, in order to prevent or delay the erosion of external factors to the concrete, the durability of the concrete is improved, the surface protection and slight damage repair of the tunnel concrete structure are required, and the service life of the tunnel concrete structure is prolonged.

At present, aiming at tunnel concrete protection and slight disease repair in an operation period, the most commonly used pre-curing means is a surface protection technology, and is an active protection measure with low cost and simple construction process for improving the durability of the concrete. However, the surface protection of the existing tunnel concrete structure adopts conventional protection materials, the conventional materials are difficult to coat on a wet concrete base surface, and in an environment with moisture or water vapor oozing slowly and continuously, the initial adhesion is difficult to resist the water vapor oozing, so that the durability of the tunnel concrete surface after protection is poor. The long-time humid environment can greatly reduce the service life of the material, and phenomena such as bulge, peeling, falling off and the like are easy to occur. This not only causes the later stage to construct extravagantly repeatedly, influences the tunnel simultaneously pleasing to the eye, can reduce concrete structure life moreover. The above factors limit the application of concrete surface protection technology in tunnel maintenance, resulting in the inability to perform effective preventive maintenance.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a tunnel concrete wet surface permeation curing protective material which can be permeation cured to form a film on the concrete wet surface and has certain bonding strength. The method not only can technically solve the problems of pre-curing durability of tunnel concrete surface protection and slight damage repair, but also can prolong the service period of protective materials, reduce repeated construction waste and the like, and has important economic and social benefits.

In order to achieve the above purpose, the technical scheme provided by the invention is as follows:

a tunnel concrete wet surface penetration curing protective material comprises a component A and a component B; the component A consists of the following components in parts by mass: 20-30 parts of low molecular weight epoxy resin, 1-2 parts of coupling agent, 1-2 parts of defoamer, 1-2 parts of flatting agent, 5-10 parts of flexibilizer, 1-2 parts of accelerator and 40-60 parts of solvent; the component B consists of the following components in parts by mass: 10-15 parts of main curing agent, 2-5 parts of modified curing agent and 20-30 parts of solvent; wherein the mass ratio of the component A to the component B is 2-3: 1, the components are matched for use; the solvent in the component A comprises a reactive diluent, a non-reactive diluent and acetone; the reactive diluent accounts for 18-22% of the total mass of the cured protective material; the main curing agent adopts curing agent T31, which accounts for 15-25% of the total mass of the cured protective material; the modified curing agent adopts a modified ketimine curing agent; the solvent in the component B is the mixture of an inactive diluent and cyclohexanone or acetone; the total amount of the inactive diluents in the component A and the component B accounts for 20 to 30 percent of the total mass of the curing protective material.

The invention adopts low molecular weight epoxy resin, and can be permeated and cured on the wet surface of concrete to form a film by compounding with the main curing agent T31 and the modified ketimine curing agent, and has certain bonding strength. Meanwhile, the selection and the proportion of each component are screened, factors which have obvious influence on the product performance, namely active diluent and inactive diluent, are determined, and the preferable blending amount is selected to meet the construction requirement.

In some embodiments, the low molecular weight epoxy resin is one or a mixture of two of the epoxy resins E44, E51; the coupling agent adopts gamma- (2, 3) epoxy (propoxy) propyl trimethoxy silane; the defoamer adopts one or two of BYK-A530, YCK-610 and HX2013 to be mixed; the leveling agent is one or two of BYK-354, BYK-110 and YCK-2110; the toughening agent adopts an epoxy resin toughening agent WD-204; the promoter is EC-7100 or DMP-30.

The invention selects the component types which can obtain more preferable product performance, and further improves the bonding strength and penetration depth of the product coating.

In some embodiments, the accelerator in component A is preferably EC-7100, which is added in an amount of 1.5% of the total mass of the cured protective material. When the accelerator with the proportion is selected, the curing speed of the product can be effectively accelerated, and the surface drying time is shortened.

In some embodiments, as a preferred mode, the reactive diluent AGE is used as the reactive diluent in the component A, and the addition amount of the reactive diluent AGE accounts for 20% of the total mass of the cured protective material; the inactive diluents in the component A and the component B adopt the inactive diluent-dibutyl phthalate special for epoxy, and the addition amount of the inactive diluents accounts for 30 percent of the total mass of the curing protective material.

The viscosity of the epoxy resin can be further reduced and the adhesive force of the coating can be ensured by controlling the dosage of the reactive diluent; and the penetration depth of the coating is improved by controlling the dosage of the non-reactive diluent.

Further, in some embodiments, as a preferred leveling agent, BYK-354 is used, and the amount added is 1-2% of the total mass of the cured protective material. And the yield of the leveling agent is controlled, and the penetration depth of the coating is further improved.

Further, in some embodiments, as a preferable addition amount of the toughening agent accounts for 5-10% of the total mass of the cured protective material, the tensile strength and the elongation at break of the product are further improved, and the coating is not easy to break under the action of external force.

Further, in some embodiments, it is preferable that the a component and the B component are in a mass ratio of 3:1 are matched for use.

Compared with the prior art, the invention has the following advantages:

the epoxy resin with low molecular weight is adopted, has good permeability and adhesive force, is matched with the main curing agent T31 and the modified ketimine curing agent, and the polyamine dissociated by the modified ketimine curing agent when meeting moisture reacts with the epoxy resin, so that the epoxy resin is suitable for curing under the moist condition, and the phenolic amine T31 can effectively improve the heat resistance and corrosion resistance of the epoxy resin because the phenolic amine T31 contains active groups such as phenolic hydroxyl, primary amino, secondary amino and the like.

Meanwhile, silane coupling agent is matched for use, silane after coating can migrate to the interface between the coating and the concrete base surface, react with moisture on the surface of the silane, hydrolyze to generate silanol groups, form hydrogen bonds on the surface of a matrix or condense to form-Si-M (M is an inorganic surface), and meanwhile, silanol groups among molecules of the silane are mutually condensed to form a network structure.

The protective material can be permeated and solidified on the wet surface of concrete to form a film, and has certain bonding strength. The method not only can technically solve the problems of pre-curing durability of tunnel concrete surface protection and slight damage repair, but also can prolong the service period of protective materials, reduce repeated construction waste and the like, and has important economic and social benefits.

The concrete surface penetration protective material has excellent adhesive force and outstanding chemical resistance, and can be matched with various types of finish paints such as polyurethane, fluorocarbon, polysiloxane and the like.

The initial setting time of the protective material prepared by the method is not more than 12 hours, the penetration depth of the protective material on the wet surface of the concrete is more than 2mm, and the protective material is not less than 4MPa after the adhesive force of the wet surface of the concrete is 28 days.

Drawings

FIG. 1 is a schematic illustration of the preparation of the A, B component of the invention and sample block coating;

FIG. 2 is a graph showing the comparative effect of accelerator on the dry time of a product coating film;

FIG. 3 is a graph showing the effect of reactive diluent amount on coating adhesion;

FIG. 4 is a graph showing the effect of the amount of curing agent T31 on the adhesion of the coating;

fig. 5 is a schematic diagram of spline preparation and testing.

Detailed Description

The invention will now be described in detail with reference to the accompanying drawings and specific examples.

Example 1

Preparation of tunnel concrete wet surface permeation curing protective material

The preparation of the A component and the B component is carried out according to the proportion of the following table:

table 1A component proportions

The curing agent and solvent were weighed according to the formulation of Table 2.

Table 2B component proportions

The component A is prepared by weighing epoxy resin, coupling agent, leveling agent, defoamer, toughening agent, accelerator and solvent according to the formula of the table 1. Epoxy resin was added to the solvent mixture and mixed with constant stirring until completely dissolved, the solution was clear and transparent. Adding the coupling agent, the defoaming agent, the leveling agent, the toughening agent and the accelerator into the mixed solution in the previous step, and fully stirring and uniformly mixing again. The stirring speed is 1200r/min; stirring time is not less than 30min.

The component B is prepared by weighing a main curing agent phenolic amine curing agent T31 and a modified ketimine curing agent according to the formula of the table 2, adding the main curing agent phenolic amine curing agent T31 and the modified ketimine curing agent into a solvent, continuously stirring and mixing until the main curing agent phenolic amine curing agent T31 and the modified ketimine curing agent are completely dissolved, and obtaining a clear and transparent solution.

When in use, the component A and the component B are mixed according to the mass ratio of 2-3:1, and the components are fully and uniformly mixed when in use.

Example 2

Component proportion screening example

1. Experimental raw materials and apparatus

Experimental raw materials:

and (3) a component A: epoxy resin E44, solvent (active diluent AGE, non-active diluent dibutyl phthalate special for epoxy, acetone), auxiliary agent (silane coupling agent KH560, defoamer BYK-A530, flatting agent BYK-354, flexibilizer WD-204, accelerator EC-7100) and the like.

And the component B comprises the following components: modified ketimine curing agent DA-134, phenolic amine curing agent T-31, solvent (dibutyl phthalate which is a special inactive diluent for acetone and epoxy).

The concrete test block is prepared according to the specification in standard of plain concrete mechanical property experiment method standard GB50081, and the test block size is 100mm multiplied by 100mm.

Experimental facilities: digital display constant temperature magnetic stirrer, digital display pull-open method adhesion tester BGD500, universal tester WAW-1000D, etc.

2. Preparation of protective Material

The protective material was prepared and the product performance was tested using the method of example 1.

2.1 Performance index

The conventional concrete protective material can be constructed under the concrete drying condition (the water content of the concrete surface is required to be lower than 6%), the water content of a concrete wet basal plane is higher, and in order to ensure the moisture curing effect, the technical target of the design protective material is as follows: curing the concrete in a water saturated state (the surface is not required to be provided with floating water), and the initial setting time is not more than 12 hours.

The penetration depth is not definitely regulated in the current industry standard, but plays an important role in ensuring that the material can be well adhered to the concrete surface, the bonding strength and durability of the protective material are affected, the penetration depth requirement of relevant landmarks and group marks on the penetration crystalline waterproof material is more than 2mm, the adhesive force with the concrete base layer is better enhanced for ensuring that the material has a longer service life, and meanwhile, a certain enhancement effect is generated on the concrete base layer.

The bonding strength of the industry standard on the wet base surface of the epoxy resin waterproof coating is required to be more than 2.5MPa, and the better bonding strength can resist or bear the increase of the water pressure in the concrete and can also better inhibit foaming, peeling, falling and the like of the material after protection. The design protective material has the adhesive force of not lower than 4MPa after 28 days of the wet surface of the concrete.

2.2 coating preparation

Selecting a concrete test block meeting the requirements, removing a surface floating layer and oil stains, and then soaking in water for not less than 48 hours. Taking out the concrete test block, and wiping surface floating water for standby.

The preparation method of example 1 was followed by mixing the A and B components according to A: b=3: 1, and uniformly stirring to prepare the permeable curing protective material. The prepared material was uniformly brushed on the surface of the test block with a brush, and uniformly brushed once again at 15 minutes intervals, ensuring uniform coating thickness distribution, and forming a thin coating film, as shown in fig. 1. And finally, placing the sample test block into a constant temperature and humidity box for maintenance, and detecting the related performance.

3. Selection of the Components

3.1 epoxy resin

The epoxy resin has good adhesive force and outstanding chemical resistance, can be matched with different curing agents to obtain the paint with different performance requirements, and has good suitability with various types of finish paints such as polyurethane, fluorocarbon, polysiloxane and the like. The epoxy resin with medium and low molecular weight has lower viscosity and is easier to penetrate into microcracks on the surface of the concrete.

3.2 curing Agents

In a humid environment, curing of epoxy resins requires special curing agents. Ketimine is a condensation polymer prepared by the reaction of ketone and poly-primary amine, the reaction is reversible, when the ketimine encounters moisture or water, the poly-amine and the corresponding ketone are dissociated, and the poly-amine can react with epoxy resin for curing in a humid environment. The phenolic amine T31 can be used as a curing agent of epoxy resin in a low-temperature and humid environment, and the epoxy resin is cured and then the heat resistance and corrosion resistance of the epoxy resin are improved because the phenolic amine T31 contains active groups such as phenolic hydroxyl groups, primary amino groups, secondary amino groups and the like.

3.3 auxiliary agent

When a small amount of silane coupling solvent is added into the anti-paint, the silane can migrate to the interface between the paint and the concrete base surface after finishing coating, react with water on the surface of the paint, hydrolyze to generate silanol groups, form hydrogen bonds on the surface of a matrix or condense to form-Si-M (M is an inorganic surface), and meanwhile, the silanol groups among the molecules of the silane are mutually condensed to form a network structure.

4. Influence of the proportion of each component on the performance of the product

4.1 influencing factors of the curing time

The drying process after coating is actually the curing reaction process of the material, and the whole process can be influenced by factors such as temperature, accelerator and the like. Under the condition that other conditions are unchanged (the mass ratio of the component A to the component B is 3:1, the mixing amounts of the low molecular weight epoxy resin, the coupling agent, the defoaming agent, the leveling agent, the toughening agent, the acetone, the special epoxy non-reactive diluent and the reactive diluent are respectively 25 parts, 1 part, 10 parts, 15 parts and 25 parts, the mixing amounts of the modified ketimine curing agent DA-134, the phenolic amine curing agent T-31 and the solvent in the component B are respectively 2.5 parts, 15 parts and 25 parts), 1.5% of the accelerator and no accelerator are added to the protective material for performance comparison, and the influence of the temperature and the accelerator on the surface dryness of the material after the material is coated with the wet base concrete test block is observed, and the result is shown in figure 2.

As can be seen from fig. 2, the curing reaction speed increases with increasing ambient temperature and the film surface drying time decreases with the other conditions. When 1.5w% of accelerator is added, the curing speed at the same temperature is increased, and the surface drying time is shortened. Therefore, both the temperature and the accelerator will promote curing thereof, shortening the curing time.

4.2 influencing factors of adhesion

The addition of the reactive diluent can dilute the epoxy resin, reduce the viscosity of the epoxy resin, be favorable for improving the fluidity of the components and promote the crosslinking curing reaction of the epoxy resin. Under other conditions, the mass ratio of the component A to the component B is 3:1, the mixing amount of the low molecular weight epoxy resin, the coupling agent, the defoaming agent, the leveling agent, the toughening agent and the solvent in the component A is 25 parts, 1 part, 10 parts and 50 parts respectively, the mixing amount of the accelerator is 1.5 percent, and the mixing amount of the modified ketimine curing agent DA-134, the phenolic amine curing agent T-31 and the solvent in the component B is 2.5 parts, 15 parts and 25 parts respectively, wherein the total amount of the solvent in the component A is unchanged, and the mixing amount ratio of the reactive diluent in the protective material is only changed, so that the influence on the coating adhesive force is studied by controlling the using amount of the reactive diluent. The results are shown in FIG. 3.

As can be seen from fig. 3, under other conditions, the adhesion of the coating tends to increase and then decrease with increasing amounts of reactive diluent. The reactive diluent can reduce the viscosity of the epoxy resin, improve the fluidity of the epoxy resin and promote the cross-linking curing reaction of the epoxy resin, but the curing reaction is affected along with the continuous increase of the dosage of the reactive diluent. Therefore, the optimal mixing amount of the reactive diluent designed by the formula of the invention is about 20% by comprehensively considering the reduction of the viscosity of the epoxy resin and the guarantee of the adhesive force of the coating.

In addition to the amount of reactive diluent, the amount of curing agent also has a relatively pronounced effect on the adhesion of the coating. The relationship between the curing agent T31 and the adhesive strength of the coating is studied by changing the amount of the curing agent T31 under the condition that other conditions are not changed.

As can be seen from fig. 4, under the condition that other conditions are unchanged (the mass ratio of the component a/B is 3:1, the mixing amounts of the low molecular weight epoxy resin, the coupling agent, the defoamer, the leveling agent, the toughening agent and the solvent in the component a are 25 parts, 1 part, 10 parts and 50 parts, respectively, the mixing amount of the accelerator in the protective material is 1.5%, wherein the mixing amount of the reactive diluent in the component a in the protective material is 20%, and the mixing amounts of the modified ketimine curing agent DA-134 and the solvent in the component B are 2.5 parts and 25 parts, respectively, wherein the mixing amount of the curing agent T31 is variable), the adhesive strength between the coating and the concrete surface layer increases with the increasing mixing amount of the curing agent T31. When the mixing amount of the curing agent T31 is more than 15%, the bonding strength of the coating layer basically tends to be stable. As the amount of the curing agent T31 added continues to increase, the adhesive strength of the coating layer slightly decreases. The optimum blending amount of the curing agent T31 is 15-25%.

4.3 influencing factors of penetration depth

The penetration depth is one of the important indexes for combining the penetration protective material and the concrete, and the deeper the penetration depth of the coating is, the stronger the combining force between the coating and the concrete is. There is no clear requirement in the industry for penetration depth by relevant standards, so no standard test method characterizes the penetration depth of the coating. The coloring agent is thus introduced into the mixed components before the application, so that the protective material has a pronounced color.

The invention discovers that the use amount of the non-reactive diluent and the use amount of the flatting agent BYK-354 have great influence on the penetration depth of the protective material. The concentration of the epoxy resin is influenced by the mixing amount of the diluent, and the lower the concentration is, the lower the viscosity is, and the higher the penetrating power is. In addition, the addition of the leveling agent improves the fluidity and the dispersibility of the mixed solution, and finally, the permeability of the mixed solution can be improved. As can be seen from Table 3, the amounts of the other components were fixed (the mass ratio of the A/B component was 3:1, the amounts of the low molecular weight epoxy resin, the coupling agent, the defoamer, the leveling agent, the toughening agent, the acetone and the reactive diluent in the A component were 25 parts, 1 part, 10 parts and 25 parts, respectively, and the amounts of the modified ketimine curing agent DA-134, the phenolic amine curing agent T-31 and the acetone in the B component were 2.5 parts, 15 parts and 10 parts, respectively, wherein the amount of the non-reactive diluent was a variable), respectively, and the penetration depth of the coating was gradually increased with the increase of the amount of the non-reactive diluent. Other conditions were unchanged, and the penetration depth of the coating was about 1mm at 10% and 15% of the non-reactive diluent blend without leveling agent. The penetration depth of the coating was about 1.5mm at 20% and 25% of the non-reactive diluent. At a non-reactive diluent loading of 30%, the penetration depth of the coating was about 1.7mm. As can be seen from Table 4, the other conditions were unchanged, the amount of the fixed inactive diluent was 30%, and the amount of the leveling agent was gradually increased from 0 to 1.5%, with a consequent increase in the penetration depth of the coating from 1.7mm to 2.3mm. Obviously, the penetration depth of the coating can be properly improved by adding the leveling agent, and the penetration depth of the coating is stable along with the continuous increase of the leveling agent. Therefore, the optimal blending amount of the leveling agent is between 1% and 2%.

TABLE 3 Effect of non-reactive diluents on penetration depth

TABLE 4 Effect of adjuvants on penetration depth

4.4 influence factors of mechanical Properties

In addition to the aforementioned curing time, adhesion and penetration depth, the mechanical properties of the concrete protective material itself are also important factors in considering whether the material properties are superior. Wherein the main mechanical properties are tensile strength and elongation at break after curing.

Under the condition that other conditions are unchanged (the mass ratio of the component A to the component B is 3:1, the mixing amount of the low molecular weight epoxy resin, the coupling agent, the defoaming agent, the leveling agent and the solvent in the component A is 25 parts, 1 part and 50 parts respectively, the mixing amount of the accelerator is 1.5 percent, and the mixing amounts of the modified ketimine curing agent DA-134, the phenolic amine curing agent T-31 and the solvent in the component B are 2.5 parts, 15 parts and 25 parts respectively. The mixing amount of the toughening agent is variable), three groups of experiments are respectively set to be group I, group II and group III. The formulation of group I was not added with toughener, the formulation of group II was added with 5% epoxy toughener, the formulation of group III was added with 10% epoxy toughener, and 250mm x 10mm x 2mm dumbbell test bars were prepared as required, 5 for each group of effective bars, and tested after 7 days of curing in the mold, as shown in FIG. 5. The test equipment was tested by a universal tester, and the results are shown in Table 5.

TABLE 5 tensile Strength and elongation at break of materials

As can be seen from Table 5, in group I without toughening agent, the average tensile strength was 2.42MPa and the elongation at break was 4.564%; in group II, 5% of toughening agent is added into the formula, the average tensile strength is 4.18MPa, and the elongation at break is 7.574%; in group III, 10% of toughening agent is added into the formula, the average tensile strength is 5.16MPa, and the elongation at break is 10.722%. Thus, in the absence of the toughening agent, the material is insufficient in flexibility and brittle failure is likely to occur. With the addition of the toughening agent, the flexibility of the coating is enhanced, the tensile strength and the elongation at break are obviously improved, and the coating is not easy to break under the action of external force.

5. Construction method

The product studied herein has been tried in tunnel concrete wet surface repair engineering, the construction of which should follow the following steps:

(1) And (3) polishing the pollutants such as water stains, floating ash, cement slag, release agent and the like on the surface of the base layer by using a grinding wheel. The surface contaminated by the oil stain is scrubbed with a corresponding solvent (such as xylene) to ensure the coating adhesion. The bowl-shaped diamond grinding disc is used for leveling the template trace and the staggered platform, and the higher part of the staggered platform should be kept as low as possible (but the steel bar is not needed to be punched out) so as to form a smooth transition area.

(2) Preparing a penetration curing material according to the product requirement, uniformly brushing the penetration curing material on the surface of the clean concrete base material, and fully ensuring the curing time according to the curing requirement; when in coating, the sealing paint is ensured to be fully coated on all surfaces to be coated. After the coating operation is completed, self-inspection is carried out, and the paint film should form a uniform and complete continuous film. And (3) carrying out recoating operation on the parts of the paint film with defects affecting the protection quality, such as missing coating, cracks, bubbles and the like.

(3) For defect parts such as pits and cracks on a concrete base surface, the concrete base surface is cleaned, then is coated with a permeable moisture curing protective material, after curing, an epoxy system mortar is used for repairing cracks on the concrete surface, and when the cracks influence the performance of the concrete structure, a reinforcing method is used for treating the concrete structure, such as basalt fiber cloth pasting, and the like. When the epoxy mortar is used for construction, the coating is required to be uniform in color and luster, and phenomena such as sagging, missing coating and air bubbles cannot be caused.

After the permeation and repair are finished, the outermost layer is sprayed with weather-resistant surface paint (such as fluorocarbon finish paint) to carry out dust-proof and anti-aging protection on the protective structure, so that the attractive effect and ultraviolet and aging resistance of the protective structure are improved, and the external corrosion environment is further isolated.

Example 3

The invention relates to a tunnel concrete wet surface permeation curing protective material, which is prepared by the following steps:

the preparation method of the component A comprises the following steps: 25 parts of epoxy resin (E44) is weighed and placed in a container, 25 parts of active epoxy diluent (AGE) is weighed respectively, 15 parts of inactive diluent special for epoxy and 10 parts of acetone are mixed with the epoxy resin, and the mixture is continuously stirred until the mixture is completely dissolved, and the solution is clear and transparent. Then 1 part of coupling agent KH-560,1 parts of defoamer BYK-A530 and 1 part of flatting agent BYK-354, 10 parts of epoxy toughening agent WD-204 and 2 parts of accelerator EC-7100 are added into the prepared solution, and the mixture is continuously stirred and fully mixed. The stirring speed is 1200r/min; stirring time is not less than 30min.

The preparation method of the component B comprises the following steps: 15 parts of a main curing agent phenolic amine curing agent (T31) and 2.5 parts of modified ketimine (DA-134) are respectively weighed and placed in a container, 15 parts of an inactive diluent special for epoxy and 10 parts of acetone are respectively weighed and fully mixed with the curing agent, and the mixture is stirred until the curing agent is completely dissolved.

When in use, the component A and the component B are mixed according to the mass ratio of 3:1, and the components are fully and uniformly mixed when in use.

Performance testing was performed as in example 2, test results: the surface drying time of the coating is not more than 4 hours, the average adhesive force of the coating is 6.5MPa, the penetration depth is about 2mm, the average tensile strength of the material is 5.16MPa, and the average elongation at break is 10.72%.

Claims (7)

1. The tunnel concrete wet surface penetration curing protective material is characterized by comprising a component A and a component B; the component A consists of the following components in parts by mass: 20-30 parts of low molecular weight epoxy resin, 1-2 parts of coupling agent, 1-2 parts of defoamer, 1-2 parts of flatting agent, 5-10 parts of flexibilizer, 1-2 parts of accelerator and 40-60 parts of solvent; the component B consists of the following components in parts by mass: 10-15 parts of main curing agent, 2-5 parts of modified curing agent and 20-30 parts of solvent; the mass ratio of the component A to the component B is 2-3: 1, the components are matched for use; the solvent in the component A comprises a reactive diluent, a non-reactive diluent and acetone; the reactive diluent accounts for 18-22% of the total mass of the cured protective material; an inactive diluent; the main curing agent adopts a curing agent T31, and accounts for 15-25% of the total mass of the cured protective material; the modified curing agent adopts a modified ketimine curing agent; the solvent in the component B is a mixture of an inactive diluent and cyclohexanone or acetone; the total amount of the inactive diluents in the component A and the component B accounts for 20 to 30 percent of the total mass of the curing protective material.

2. The tunnel concrete wet surface penetration cure protective material according to claim 1, wherein the low molecular weight epoxy resin is one or two of epoxy resins E44, E51; the coupling agent adopts gamma- (2, 3) epoxy (propoxy) propyl trimethoxy silane; the defoaming agent is one or two of BYK-A530, YCK-610 and HX 2013; the leveling agent is one or two of BYK-354, BYK-110 and YCK-2110; the toughening agent adopts an epoxy resin toughening agent WD-204; the promoter is EC-7100 or DMP-30.

3. The tunnel concrete wet surface penetration curing protective material according to claim 2, wherein the accelerator in the A component adopts EC-7100, and the addition amount of the accelerator accounts for 1.5% of the total mass of the curing protective material.

4. The tunnel concrete wet surface penetration curing protective material according to claim 3, wherein the reactive diluent in the component A adopts reactive diluent AGE, and the addition amount of the reactive diluent AGE accounts for 20% of the total mass of the curing protective material; the inactive diluent in the component A and the inactive diluent in the component B adopt dibutyl phthalate, and the addition amount of the inactive diluent accounts for 30 percent of the total mass of the curing protective material.

5. The tunnel concrete wet surface penetration curing protective material according to claim 4, wherein the leveling agent adopts BYK-354, and the addition amount of the leveling agent accounts for 1-2% of the total mass of the curing protective material.

6. The tunnel concrete wet surface penetration curing protective material according to claim 5, wherein the addition amount of the toughening agent is 5-10% of the total mass of the curing protective material.

7. The tunnel concrete wet surface penetration curing protective material according to any one of claims 1 to 6, wherein the a component and the B component are in a mass ratio of 3:1 are matched for use.