A strong reinforcing interfacial agent for loose substrates and a method for preparing the same

Abstract

The present application relates to the technical field of interface agent, in particular to a kind of strong reinforcing interface agent for loose substrate and its preparation method, according to weight parts, its preparation raw material at least includes high molecular emulsion 180-250 parts, film forming auxiliary agent 5-15 parts, functional auxiliary agent 0.5-5 parts, fungicide 0.01-2 parts, water 150-220 parts, by optimizing interface agent formula system, the interface agent material provided can penetrate to the wall ground of obvious sand drop, especially loose substrate, the inside of old house wall to the loose base layer is thoroughly reinforced, has obviously improved bonding strength, water resistance, heat resistance and alkali resistance, satisfies the practical use demand of above-mentioned field.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of interface agents, in particular to a strong reinforcing interface agent for loose substrates and a preparation method thereof. BACKGROUND

[0002] With the saturation of land use rate, more and more old buildings are facing reconstruction and renovation maintenance, and the old wall renovation usually needs to be reinforced by using an interface agent first, because the dust on the old wall will cause the paint to fall off. The common interface agents on the market are divided into dry powder type and emulsion type. The dry powder type interface agent is composed of inorganic cementitious materials such as cement, fillers, and polymer powder, etc. into a powder, which is used by mixing with water in a certain proportion. The emulsion type interface agent is mainly composed of chemical polymer materials, and other fillers are added, such as the Chinese patent application (authorized publication number CN115011191B) discloses an interface treatment coating, a preparation method thereof and a building coating application, which effectively uses the interface treatment coating for building coating by using chemical and physical adhesion. The Chinese patent application (authorized publication number CN116836625B) is designed to solve the problems existing in the treatment of concrete surface, and the hydrophobicity and service life of concrete are improved by introducing a silane coupling agent. However, it cannot penetrate the loose base layer inside the obviously sanding wall ground, especially the loose base, and the bonding strength, water resistance, heat resistance and alkali resistance need to be further improved, which cannot meet the actual use requirements in the above fields. SUMMARY

[0003] In order to solve the above problems, the present application provides a strong reinforcing interface agent for loose substrates, which can penetrate the loose base layer inside the obviously sanding wall ground, especially the loose base, and completely reinforce the loose base layer inside the old house wall body by optimizing the interface agent formula system, has obviously improved bonding strength, water resistance, heat resistance and alkali resistance, and meets the actual use requirements in the above fields.

[0004] In one aspect, the present application provides a strong reinforcing interface agent for loose substrates, which is prepared from at least 180-250 parts by weight of a high molecular emulsion, 5-15 parts by weight of a film-forming aid, 0.5-5 parts by weight of a functional aid, 0.01-2 parts by weight of a bactericide, and 150-220 parts by weight of water.

[0005] As a preferred technical solution, the preparation raw materials of the strong reinforcing interface agent for loose substrates are composed of 220-240 parts by weight of a high molecular emulsion, 8-12 parts by weight of a film-forming aid, 1-2 parts by weight of a functional aid, 0.5-1 part by weight of a bactericide, and 155-175 parts by weight of water.

[0006] As a preferred technical solution, the particle size of the high polymer emulsion is 0.01-0.5 μm, preferably 0.05-0.2 μm.

[0007] As a preferred technical solution, the viscosity (Brookfield viscometer, 25℃, No. 3 rotor, 12 r / min) of the high polymer emulsion is 500-5000 mPa·s.

[0008] As a preferred technical solution, the high polymer emulsion is selected from at least one of styrene-acrylic emulsion, pure acrylic emulsion, and polyurethane emulsion.

[0009] Preferably, the high polymer emulsion is a styrene-acrylic emulsion, the particle size of the styrene-acrylic emulsion is 0.1-0.2 μm, and the viscosity (Brookfield viscometer, 25℃, No. 3 rotor, 12 r / min) is 500-3000 mPa·s.

[0010] As a preferred technical solution, the film-forming aid is selected from at least one of dibutyl phthalate, dipropylene glycol n-butyl ether, 2,2,4-trimethyl-1.3 pentanediol monoisobutyrate, and tripropylene glycol n-butyl ether, preferably 2,2,4-trimethyl-1.3 pentanediol monoisobutyrate.

[0011] Preferably, the solid content of the styrene-acrylic emulsion is 40-50 wt%, and the mass ratio of the styrene-acrylic emulsion to 2,2,4-trimethyl-1.3 pentanediol monoisobutyrate is (22-24):1.

[0012] As a preferred technical solution, the functional aid is selected from at least one of wetting agent, dispersant, surfactant, antioxidant, and waterproof agent.

[0013] Preferably, the wetting agent is an anionic wetting agent selected from at least one of alkyl sulfate, sulfonate, fatty acid or fatty acid ester sulfate, carboxylic acid soap, and phosphate ester, preferably sodium diisooctyl sulfosuccinate.

[0014] Preferably, the active ingredient of the bactericide is selected from at least one of chloromethyl isothiazolinone, methyl isothiazolinone, benzisothiazolinone, methyl isothiazolinone, formaldehyde condensate, and formaldehyde. Preferably, the bactericide is Defros D29 from Hofmann, which effectively inhibits the growth of bacteria and fungi of the interface agent during production or storage without affecting the stability of the product.

[0015] The present application controls the particle size of the high molecular emulsion to be 0.05-0.2 μm, the viscosity (Brookfield viscometer, 25℃, No. 3 rotor, 12 r / min) to be 500-5000 mPa·s, and matches the anionic wetting agent, so that the interface agent material provided has deep penetration ability, good sand consolidation effect and effect, and after being brushed on the base layer, secondary reaction forms a reinforced layer with good sealing property and excellent water resistance, effectively improving the hardness of the base layer. The inventor analyzes the reason as follows: under the action of the anionic wetting agent, especially when the anionic weting agent is sodium diisooctyl sulfonate, the high molecular emulsion with the above-mentioned particle size of 0.05-0.2 μm and viscosity of 500-5000 mPa·s expands and penetrates into the loose base layer and firmly combines with the base layer to form a dense whole, effectively reinforcing and forming a hydrophobic protective layer at the same time, and the larger the particle size and the viscosity of the high molecular emulsion, the more difficult the penetration of the interface agent into the loose base material.

[0016] Further, in the process of formula optimization, it is found that the matching of the high molecular emulsion and the film forming aid directly affects the density and the minimum film forming temperature of the subsequent film forming, and in the present application, the phenylpropylene emulsion is matched with 2,2,4-trimethyl-1.3 pentanediol monoisobutyrate to form a film, and the addition amount of the phenylpropylene emulsion and 2,2,4-trimethyl-1.3 pentanediol monoisobutyrate in the interface agent is further controlled, so as to effectively reduce the film forming temperature while ensuring the density of the subsequent film forming, the strengthened strength is not affected by thermal expansion and cold shrinkage and temperature change, and is alkali resistant, and the permeability can be further improved. The inventor analyzes the reason as follows: under the above-mentioned addition amount, the stability of 2,2,4-trimethyl-1.3 pentanediol monoisobutyrate in the phenylpropylene emulsion system is relatively high, and can be adsorbed by the polymer latex particles, on the one hand, the polymer latex particles with smaller particle size can more easily penetrate into the pores and cracks inside the loose base layer, and on the other hand, the polymer latex particles complete fusion and coalescence to form a complete and continuous dense paint film during the drying process of the paint film, so as to ensure that the strength of the paint film is not affected by thermal expansion and cold shrinkage and temperature change, and is alkali resistant, and the addition of other film forming aids cannot effectively improve the permeability of the interface agent or may cause the emulsion to flocculate, and the addition amount of the phenylpropylene emulsion and 2,2,4-trimethyl-1.3 pentanediol monoisobutyrate is too low to reduce the overall performance of the subsequent paint film.

[0017] In another aspect, the present application provides a preparation method of a strong reinforcing interface agent for loose base material, which at least comprises the following steps: mixing high molecular emulsion, film forming aid and functional aid by weight parts, and then adding water and bactericide to obtain the interface agent.

[0018] Advantages

[0019] 1. The present application provides a strong interface agent for reinforcing loose substrates, by optimizing the interface agent formula system, the interface agent material provided can penetrate into the obviously sanding wall floor, especially the loose base, the inside of the old house wall to thoroughly reinforce the loose base layer, has obviously improved bonding strength, water resistance, heat resistance and alkali resistance, meets the actual use requirements in the above-mentioned fields.

[0020] 2. The present application controls the particle size of the high molecular emulsion to be 0.05-0.2μm, the viscosity (Brookfield viscometer, 25℃, No.3 rotor, 12r / min) is 500-5000mPa·s, and cooperates with an anionic wetting agent, so that the interface agent material provided has deep penetration ability, good sand fixation effect and effect, and after being applied to the base layer, secondary reaction forms a reinforced layer with good sealing property, excellent water resistance, and effectively improves the hardness of the base layer.

[0021] 3. The present application further controls the addition amount of the styrene-acrylic emulsion and 2,2,4-trimethyl-1.3 pentanediol monoisobutyrate in the interface agent by using the styrene-acrylic emulsion to cooperate with 2,2,4-trimethyl-1.3 pentanediol monoisobutyrate to form a film, effectively reduces the film forming temperature while ensuring the density of the subsequent film forming, the reinforced strength is not affected by thermal expansion and cold shrinkage and temperature change, and is resistant to alkali return, and can further improve the permeability.

[0022] 4. In the present application, by introducing the bactericide Defros D29, the growth of bacteria and fungi in the interface agent during production or storage is effectively inhibited without affecting the stability of the product.

[0023] 5. The interface agent provided by the present application has low cost, simple preparation method, good compatibility between raw materials, and high product stability. DETAILED DESCRIPTION

[0024] Example 1

[0025] Example 1 of the present application provides a strong interface agent for reinforcing loose substrates, according to weight parts, the preparation raw materials include high molecular emulsion 220 parts, film forming aid 10 parts, functional aid 1 part, bactericide 1 part, and water 175 parts.

[0026] The high molecular emulsion is a styrene-acrylic emulsion, the particle size of the styrene-acrylic emulsion is 0.1-0.2μm, the viscosity (Brookfield viscometer, 25℃, No.3 rotor, 12r / min) is 500-3000mPa·s, the model is FS-6607, and the source is Bade Fu.

[0027] The film forming aid is 2,2,4-trimethyl-1.3 pentanediol monoisobutyrate (Texanol, Eastman).

[0028] The solid content of the styrene-acrylic emulsion is 45±1wt%.

[0029] The functional auxiliary agent is a wetting agent, and the wetting agent is an anionic wetting agent, specifically sodium dioctyl sulfosuccinate (GEROPON CYA / X, Solvay).

[0030] The bactericide is Defros D29, which is from Hoffmann.

[0031] The embodiment 1 of the present application further provides a preparation method of the interface agent for reinforcing the loose substrate, comprising the following steps: mixing a polymer emulsion, a film-forming auxiliary agent and a functional auxiliary agent by weight parts, and then adding water and a bactericide to obtain the interface agent.

[0032] Embodiment 2

[0033] The embodiment 2 of the present application provides an interface agent for reinforcing the loose substrate and a preparation method thereof, and the specific implementation manner is the same as that of the embodiment 1, except that the preparation raw materials include 240 parts of the polymer emulsion, 10 parts of the film-forming auxiliary agent, 1 part of the functional auxiliary agent, 1 part of the bactericide and 155 parts of water by weight.

[0034] Embodiment 3

[0035] The embodiment 3 of the present application provides an interface agent for reinforcing the loose substrate and a preparation method thereof, and the specific implementation manner is the same as that of the embodiment 1, except that the preparation raw materials include 200 parts of the polymer emulsion, 10 parts of the film-forming auxiliary agent, 1 part of the functional auxiliary agent, 1 part of the bactericide and 195 parts of water by weight.

[0036] Embodiment 4

[0037] The embodiment 4 of the present application provides an interface agent for reinforcing the loose substrate and a preparation method thereof, and the specific implementation manner is the same as that of the embodiment 1, except that the preparation raw materials include 210 parts of the polymer emulsion, 10 parts of the film-forming auxiliary agent, 1 part of the functional auxiliary agent, 1 part of the bactericide and 185 parts of water by weight.

[0038] Performance test method

[0039] 1. The 42.5 cement and the standard sand are mixed into a powder at a mass ratio of 1:1, and the interface agent provided by the embodiment is prepared into a test sample at a mass ratio of 1:4.3 with the powder to perform the following performance test.

[0040] (1) Tensile bonding strength (without treatment), MPa, tested according to the standard JC / T 907-2018-I for concrete interface treatment agent, and the results are shown in Table 1.

[0041] (2) Tensile bond strength (after water immersion treatment), MPa, tested according to the standard of concrete interface treatment agent JC / T907-2018-I type, the results are shown in Table 1.

[0042] (3) Tensile bond strength (after heat resistance treatment), MPa, tested according to the standard of concrete interface treatment agent JC / T907-2018-I type, the results are shown in Table 1.

[0043] (4) Tensile bond strength (after alkali resistance treatment), MPa, tested according to the standard of concrete interface treatment agent JC / T907-2018-I type, the results are shown in Table 1.

[0044] 2, Penetration depth: the interface agent provided by the example is coated on the surface of the loose substrate (concrete ALC plate) with the same mass, 3 parallel coatings are coated, and after coating, 5 minutes are waited, the loose substrate plate is cut, the penetration depth is measured, the average value is taken, and the results are shown in Table 1.

[0045] Table 1

[0046]

[0047]

Claims

1. A highly effective reinforcing interface agent for porous substrates, characterized in that, The raw materials for its preparation, by weight, include at least 180-250 parts of polymer emulsion, 5-15 parts of film-forming aid, 0.5-5 parts of functional aid, 0.01-2 parts of bactericide, and 150-220 parts of water. The particle size of the polymer emulsion is 0.01-0.5 μm; The viscosity of the polymer emulsion at 25°C is 500-5000 mPa·s; The film-forming aid is 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate; The polymer emulsion is a styrene-acrylic emulsion with a solid content of 40-50 wt% and a mass ratio of styrene-acrylic emulsion to 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate of (22-24):

1.

2. The interface agent for strongly reinforcing porous substrates according to claim 1, characterized in that, The functional additive is selected from at least one of wetting agents, dispersants, surfactants, antioxidants, and waterproofing agents.

3. The interface agent for strongly reinforcing porous substrates according to claim 2, characterized in that, The wetting agent is an anionic wetting agent, selected from at least one of alkyl sulfates, sulfonates, fatty acid or fatty acid ester sulfates, carboxylic acid soaps, and phosphate esters.

4. The interface agent for strongly reinforcing porous substrates according to claim 3, characterized in that, The active ingredient of the bactericide is selected from at least one of chloromethylisothiazolinone, methylisothiazolinone, benzisothiazolinone, methylisothiazolinone, formaldehyde condensate, and formaldehyde.

5. A method for preparing a strong reinforcing interface agent for porous substrates according to any one of claims 1-4, characterized in that, It includes at least the following steps: mixing the polymer emulsion, film-forming aid, and functional aid by weight, then adding water and bactericide to mix.

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