Composition for interface agent, interface agent as well as preparation method and application of interface agent

Abstract

The invention relates to the field of concrete composite structures, and discloses a composition for an interface agent, the interface agent and a preparation method and application of the interface agent. The composition contains silica sol, a block copolymer, epoxy vegetable oil, a polymer emulsion and an organic solvent in a mass ratio of 1: (0.5-2): (0.5-2): (1-3): (0.25-1), the average particle diameter of the silica sol is 10-30 nm, the solid content is 20-35 wt%, and the pH value is 7.0-11.0; the viscosity of the block copolymer at the temperature of 25 DEG C is 300 to 900 cps; and the hydrophilic-lipophilic balance value of the block copolymer is 10 to 25. The interface agent prepared from the composition for the interface agent provided by the invention has a good application prospect in the field of concrete composite structures.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete composite structures, and in particular to an interface agent composition, an interface agent, and a preparation method and application thereof. Background Art

[0002] As the core basic material for modern construction and infrastructure, concrete occupies an irreplaceable position in major projects such as bridge projects, high-speed railways, port terminals, and super high-rise buildings due to its ultra-high compressive strength, excellent durability and significant economy.

[0003] However, traditional concrete has inherent defects such as high brittleness (ultimate tensile strain is only 0.01%-0.03%) and low tensile strength (<10% of compressive strength). In special engineering scenarios such as joint post-cast strips and vibration-damping and energy-absorbing functional layers, its rigidity-dominated mechanical properties can easily cause interface delamination or fatigue cracking due to stress concentration, seriously restricting the service safety of the structure.

[0004] To address these technical bottlenecks, polymer-modified cementitious composites have achieved breakthrough optimization of material properties by introducing a flexible polymer phase. For example, polymer concrete, formed with a polyurethane prepolymer / epoxy resin as the continuous phase, can effectively absorb dynamic displacement loads at bridge expansion joints. Cement-emulsified asphalt mortar, through its interpenetrating network structure of asphalt emulsion and cement hydration products, has also been successfully applied to the infill layer of CRTS I / II slab track.

[0005] Compared to traditional new-to-old concrete interfaces, where interfacial strength is typically achieved through aggregate interlocking and cement hydration products, the interfacial bond between polymer cement-based materials and conventional concrete is much weaker. This is fundamentally due to the dual constraints of mechanical incompatibility and interfacial wetting failure. Furthermore, practical experience shows that vehicle loads and rainwater erosion can also accelerate interfacial debonding.

[0006] Although existing research has widely adopted interface agents such as silane coupling agents and polymer emulsions to improve the interface performance of new and old concrete, their technical logic is mainly based on chemical bonding theory, which makes it difficult to match the wetting properties of polymer-based cement-based materials.

[0007] In view of this, the development of wettability bidirectional matching interface agents provides an innovative path to break through the bottleneck of heterogeneous material interfaces and has significant engineering value in improving the bonding between concrete and polymer substrates. Summary of the Invention

[0008] The purpose of the present invention is to overcome the problem in the prior art that the surfaces of ordinary concrete and polymer concrete are difficult to wet.

[0009] In order to achieve the above-mentioned object, the first aspect of the present invention provides a composition for an interface agent, wherein the composition comprises a silica sol, a block copolymer, an epoxy vegetable oil, a polymer emulsion and an organic solvent in a mass ratio of 1: (0.5-2): (0.5-2): (1-3): (0.25-1);

[0010] The silica sol has an average particle diameter of 10-30 nm, a solid content of 20-35 wt%, and a pH of 7.0-11.0;

[0011] The viscosity of the block copolymer at 25° C. is 300-900 cps; and the hydrophilic-lipophilic balance value of the block copolymer is 10-25;

[0012] The polymer emulsion has a viscosity of 500-1500 cps at 25° C. and a pH of 6-9.

[0013] During the research process, the inventors of the present invention found that only by selecting a block copolymer with a viscosity of 300-900 cps at 25°C and a hydrophilic-lipophilic balance value of 10-25, combined with the other technical features of the present invention, can an interface agent with excellent performance be obtained.

[0014] The second aspect of the present invention provides a method for preparing an interface agent, which is carried out using the components of the interface agent composition described in the first aspect, comprising:

[0015] The silica sol, block copolymer, epoxy vegetable oil, polymer emulsion and organic solvent are contacted and mixed to obtain the interface agent.

[0016] The third aspect of the present invention provides an interface agent prepared by the method described in the second aspect.

[0017] The fourth aspect of the present invention provides the use of the interface agent described in the third aspect in the field of concrete composite structures.

[0018] The interface agent prepared by using the interface agent composition provided by the present invention can be used for bonding the interface of inorganic-organic hybrid concrete; and can also enable the bonded inorganic-organic hybrid concrete to still maintain excellent bonding properties after being soaked in water for 28 days or even 56 days. DETAILED DESCRIPTION

[0019] The endpoints of the ranges and any values disclosed herein are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0020] As mentioned above, the first aspect of the present invention provides a composition for an interface agent, which contains silica sol, block copolymer, epoxy vegetable oil, polymer emulsion and organic solvent in a mass ratio of 1: (0.5-2): (0.5-2): (1-3): (0.25-1);

[0021] The silica sol has an average particle diameter of 10-30 nm, a solid content of 20-35 wt%, and a pH of 7.0-11.0;

[0022] The viscosity of the block copolymer at 25° C. is 300-900 cps; and the hydrophilic-lipophilic balance value of the block copolymer is 10-25;

[0023] The polymer emulsion has a viscosity of 500-1500 cps at 25° C. and a pH of 6-9.

[0024] Preferably, the mass ratio of the block copolymer to the epoxidized vegetable oil is ≥ 1. The inventors of the present invention have found that, in this preferred embodiment, the obtained interface agent can enhance bonding strength and bonding durability.

[0025] According to a preferred embodiment, the block copolymer is poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol).

[0026] Preferably, the polymer emulsion is selected from at least one of styrene-butadiene emulsion, styrene acrylate emulsion and vinyl acetate-ethylene copolymer emulsion.

[0027] Preferably, the epoxidized vegetable oil is epoxidized soybean oil and / or epoxidized linseed oil.

[0028] According to another preferred embodiment, the organic solvent is selected from at least one of ethanol, propylene glycol, and butylene glycol. The inventors of the present invention have found that in this preferred embodiment, the obtained interface agent has a higher enhanced bonding strength.

[0029] As mentioned above, the second aspect of the present invention provides a method for preparing an interface agent, which is carried out using the components of the interface agent composition described in the first aspect, comprising:

[0030] The silica sol, block copolymer, epoxy vegetable oil, polymer emulsion and organic solvent are contacted and mixed to obtain the interface agent.

[0031] Preferably, the contact mixing conditions include: a temperature of 5-35° C. and a rotation speed of 500-2000 rpm.

[0032] As mentioned above, the third aspect of the present invention provides an interface agent prepared by the method described in the second aspect.

[0033] As mentioned above, the fourth aspect of the present invention provides the use of the interface agent described in the third aspect in the field of concrete composite structures.

[0034] According to a preferred embodiment, the application is carried out using a method comprising the following steps:

[0035] S1: curing the interface agent on the surface of ordinary concrete to obtain an intermediate I containing an interface layer;

[0036] S2: pouring polymer concrete on the interface layer of the intermediate I to obtain a composite concrete material.

[0037] Preferably, the curing treatment is performed by gradient curing using a high-temperature spray gun.

[0038] Preferably, after the surface of the interface layer of the intermediate I is dried, the polymer concrete is poured on the dried interface layer.

[0039] Preferably, in step S1, the thickness of the interface layer of the intermediate I is 0.1-0.5 mm, more preferably 0.1-0.2 mm.

[0040] The present invention will be described in detail below through examples. In the following examples, unless otherwise specified, the instruments, reagents, materials, etc. involved are conventional instruments, reagents, materials, etc., which can be obtained through regular commercial channels. Among them, unless otherwise specified, the reagents used are all commercially available products.

[0041] Silica sol:

[0042] Silica sol I: average particle diameter of 14.7 nm, solid content of 29.7 wt %, pH of 7.45, purchased from Guangzhou Fufei Chemical Technology Co., Ltd., brand neutral 30%.

[0043] Silica sol II: average particle diameter of 25.6 nm, solid content of 30.23 wt %, pH of 10.19, purchased from Guangzhou Fufei Chemical Technology Co., Ltd., brand alkaline 30%.

[0044] Silica sol DI: the average particle diameter is 11.78 nm, the solid content is 30.05 wt %, the pH value is 2.7, purchased from Guangzhou Fufei Chemical Technology Co., Ltd., the brand is acid 30%.

[0045] Block copolymers:

[0046] Block copolymer I: poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), having a viscosity of 375 cps at 25° C. and a hydrophilic-lipophilic balance of 18.0-23.0, was purchased from Merck Sigma under the trade number 435414.

[0047] Block copolymer II: poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), having a viscosity of 850 cps at 25°C and a hydrophilic-lipophilic balance of 12.0-18.0, was purchased from Merck Sigma under the trade number 435449.

[0048] Block copolymer DI: poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), with a viscosity of 475 cps at 25° C. and a hydrophilic-lipophilic balance value of 1.0-7.0, purchased from Merck Sigma, brand 435430.

[0049] Epoxidized vegetable oil:

[0050] Epoxidized vegetable oil I: Epoxidized soybean oil, purchased from Henan Tianfu Chemical Co., Ltd.

[0051] Epoxidized vegetable oil II: Epoxidized linseed oil, purchased from Henan Tianfu Chemical Co., Ltd.

[0052] Polymer emulsion:

[0053] Polymer emulsion I: Styrene butadiene latex, with a viscosity of 1000-1200 cps at 25° C. and a pH of 6-7, purchased from Yoshida Company, with the brand name being Styrene butadiene latex 106#.

[0054] Polymer emulsion II: styrene acrylate emulsion, with a viscosity of 600 cps at 25° C. and a pH of 8-9, purchased from Shandong Yousuo Chemical Technology Co., Ltd., with the brand name BS-104.

[0055] Polymer emulsion DI: silicone acrylic emulsion, with a viscosity of 2000 cps at 25°C and a pH of 9-10, purchased from Shandong Yousuo Chemical Technology Co., Ltd., brand BF-400B.

[0056] Organic solvent: 1,2-propylene glycol, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0057] Ordinary concrete: size is 100mm*100mm*400mm, reference standard GB / T 16777, using cement with strength grade 42.5, the mass ratio of cement: medium sand: water: water reducer is 1:2:0.3:0.006; curing in water at (20±3)℃ for up to 28 days.

[0058] Polymer concrete: polyurethane concrete. The proportion of the polyurethane concrete can be found in the literature: Yuan Qiang et al. Temperature response and mechanism of mechanical properties of polyurethane concrete [J]. Journal of Southeast University (Natural Science Edition), 2024, 54(06): 1346-1353.

[0059] Different raw material formulations are used in the following examples of the present invention. The amounts of raw materials used are all parts by weight unless otherwise specified, and each part by weight represents 10 g.

[0060] Example 1

[0061] This example is used to illustrate how to prepare an interface agent by referring to the formula in Table 1 and following the method described below:

[0062] The silica sol, block copolymer, epoxy vegetable oil, polymer emulsion and organic solvent are contacted and mixed to obtain the interface agent;

[0063] Contact mixing: temperature is 25°C, rotation speed is 1000 rpm.

[0064] Example 2

[0065] This embodiment is carried out in a similar manner to that of embodiment 1, except that the formulation is different, as shown in Table 1. The unlisted parts are the same as those of embodiment 1, to prepare an interface agent.

[0066] Example 3

[0067] This embodiment is carried out in a similar manner to that of embodiment 1, except that the formulation is different, as shown in Table 1. The unlisted parts are the same as those of embodiment 1, to prepare an interface agent.

[0068] Example 4

[0069] This example is carried out using a method similar to that of Example 1, except that the mass ratio of the block copolymer and the epoxy vegetable oil is adjusted from 2:1 in Example 1 to 1:2 while keeping the total amount of the block copolymer and the epoxy vegetable oil unchanged. The unlisted parts are the same as those of Example 1 to prepare an interface agent.

[0070] Comparative Example 1

[0071] This comparative example was carried out in a similar manner to Example 1, except that the amount of polymer emulsion I used in this comparative example was 10 parts by weight, the amount of organic solvent used was 20 parts by weight, and the unlisted parts were the same as in Example 1 to prepare an interface agent.

[0072] Comparative Example 2

[0073] This comparative example was carried out using a method similar to that of Example 1, except that silica sol I in Example 1 was replaced by silica sol DI in this comparative example, and the unlisted parts were the same as those of Example 1 to prepare an interface agent.

[0074] Comparative Example 3

[0075] This comparative example was carried out using a method similar to that of Example 1, except that the block copolymer I in Example 1 was replaced by block copolymer DI in this comparative example, and the unlisted parts were the same as those of Example 1 to prepare an interface agent.

[0076] Comparative Example 4

[0077] This comparative example was carried out using a method similar to that of Example 1, except that the polymer emulsion I in Example 1 was replaced by polymer emulsion DI in this comparative example, and the unlisted parts were the same as those of Example 1 to prepare an interface agent.

[0078] Table 1

[0079] Example 1 Example 2 Example 3 Silica Sol type Silica Sol I Silica Sol II Same as Example 1 Dosage / weight 20 15 Same as Example 1 Block copolymers type Block copolymer I Block copolymer II Same as Example 1 Dosage / weight 20 10 Same as Example 1 Epoxidized vegetable oil type Epoxidized vegetable oil I Same as Example 1 Epoxidized vegetable oil II Dosage / weight 10 Same as Example 1 Same as Example 1 polymer emulsion type Polymer Emulsion I Same as Example 1 Polymer Emulsion II Dosage / weight 20 30 Same as Example 1 organic solvents Dosage / weight 5 10 Same as Example 1

[0080] Test Example 1

[0081] The interface agents prepared in the above examples were respectively applied to prepare composite concrete materials in order to evaluate the performance of the interface agents. Specifically:

[0082] S1: Cut a 100mm×100mm×400mm ordinary concrete specimen cured for 28 days along the center of the long side using a machine tool and wait for the cut surface to dry;

[0083] S2: Curing the interface agent obtained in each of the above examples on the surface of ordinary concrete (the cut surface described in step S1) (using a high-temperature spray gun to trigger gradient curing of the interface agent) to obtain an intermediate I containing an interface layer (the thickness of the interface layer is about 0.15 mm);

[0084] S3: placing the intermediate I containing the interface layer into one side of a 100 mm × 100 mm × 400 mm mold. After the surface of the interface layer of the intermediate I is dried, pouring polyurethane concrete on the dried interface layer to fill the entire mold to obtain a composite concrete material.

[0085] The flexural strength test was performed according to the test method in the literature (Z. Xie, et al., Molecular design of epoxy resin and the driving forces in adhesion with cementitious materials, Applied Surface Science 689 (2025) 162498). The specific process is as follows:

[0086] Seven days after the polyurethane concrete was poured, the specimen was cut to obtain cut specimen A. The interface agent was ensured to be in the center of specimen A and the size of specimen A was 40 mm * 40 mm * 160 mm. The cut specimen A was subjected to a bond flexural strength test at a loading speed of 50 N / s (each group of tests was performed three times, and the average of the three strength results was taken). The specific results are shown in Table 2.

[0087] In addition, to test the bonding durability of each interface agent, a 40mm*40mm*160mm cut sample A was placed in water for 28 days and 56 days and then subjected to flexural strength tests. The specific results are shown in Table 2.

[0088] Table 2

[0089]

[0090] The above results show that the interface agent prepared using the interface agent composition provided by the present invention has excellent bonding properties (flexural strength ≥7.2 MPa at a loading speed of 50 N / s), and is very suitable for bonding the interface of inorganic-organic hybrid concrete; and can also enable the bonded inorganic-organic hybrid concrete to still maintain excellent bonding after being soaked in water for 28 days (≥6.8 MPa) or even 56 days (≥6.0 MPa).

[0091] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A composition for an interface agent, characterized in that The composition contains silica sol, block copolymer, epoxy vegetable oil, polymer emulsion and organic solvent in a mass ratio of 1:(0.5-2):(0.5-2):(1-3):(0.25-1); The silica sol has an average particle diameter of 10-30 nm, a solid content of 20-35 wt%, and a pH of 7.0-11.0; The viscosity of the block copolymer at 25° C. is 300-900 cps; and the hydrophilic-lipophilic balance value of the block copolymer is 10-25; The polymer emulsion has a viscosity of 500-1500 cps at 25° C. and a pH of 6-9.

2. The composition according to claim 1, characterized in that The mass ratio of the block copolymer to the epoxidized vegetable oil is ≥1.

3. The composition according to claim 1 or 2, characterized in that The block copolymer is poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol); And / or, the polymer emulsion is selected from at least one of styrene-butadiene emulsion, styrene acrylate emulsion and vinyl acetate-ethylene copolymer emulsion.

4. The composition according to any one of claims 1 to 3, characterized in that The epoxidized vegetable oil is epoxidized soybean oil and / or epoxidized linseed oil.

5. The composition according to any one of claims 1 to 4, characterized in that The organic solvent is selected from at least one of ethanol, propylene glycol and butylene glycol.

6. A method for preparing an interface agent, characterized in that: The method is carried out using the components of the interface agent composition according to any one of claims 1 to 5, and comprises: The silica sol, block copolymer, epoxy vegetable oil, polymer emulsion and organic solvent are contacted and mixed to obtain the interface agent.

7. The method according to claim 6, characterized in that The contact mixing conditions include: temperature of 5-35° C. and rotation speed of 500-2000 rpm.

8. The interface agent prepared by the method according to claim 6 or 7.

9. Use of the interface agent according to claim 8 in the field of concrete composite structures.

10. The use according to claim 9, characterized in that The application is performed using a method comprising the following steps: S1: curing the interface agent on the surface of ordinary concrete to obtain an intermediate I containing an interface layer; S2: pouring polymer concrete on the interface layer of the intermediate I to obtain a composite concrete material.

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