阅读说明：本技术 一种隧道衬砌结构防护涂料配套用环氧封闭底层材料 (Epoxy sealing bottom layer material matched with protective coating for tunnel lining structure ) 是由 王志伟 马伟斌 田四明 郭小雄 赵鹏 王子洪 安哲立 邹文浩 于 2020-04-28 设计创作，主要内容包括：本发明公开了一种高强度单组份隧道衬砌结构防护涂料配套用环氧封闭底层材料,包括组份A和组份B,所述组份A和组份B的质量比为(2.7:1)-(4:1)；所述组份A包括以下原料：环氧树脂、触变剂、润湿分散剂、150#溶剂油、滑石粉、KH550、流平剂、消泡剂；所述组份B为改性聚酰胺。本发明中采用固化剂及涂料用助剂与触变材料进行复配,制备出一种高强度单组份隧道衬砌结构防护涂料配套用环氧封闭底层材料,满足与混凝土间附着力,与聚氨酯层间附着力及剥离强度,而且具有优异的韧性和抗流挂性。(The invention discloses an epoxy sealing bottom layer material matched with a high-strength single-component tunnel lining structure protective coating, which comprises a component A and a component B, wherein the mass ratio of the component A to the component B is (2.7:1) - (4: 1); the component A comprises the following raw materials: epoxy resin, a thixotropic agent, a wetting dispersant, 150# solvent oil, talcum powder, KH550, a flatting agent and a defoaming agent; the component B is modified polyamide. According to the invention, the curing agent, the coating auxiliary agent and the thixotropic material are compounded to prepare the epoxy sealing bottom layer material matched with the high-strength single-component tunnel lining structure protective coating, so that the adhesive force between the epoxy sealing bottom layer material and concrete, the adhesive force between the epoxy sealing bottom layer material and polyurethane layer and the peeling strength are met, and the epoxy sealing bottom layer material has excellent toughness and sagging resistance.)

1. An epoxy sealing bottom layer material matched with a protective coating of a tunnel lining structure is characterized by comprising a component A and a component B, wherein the mass ratio of the component A to the component B is (2.7:1) - (4: 1);

the component A comprises the following raw materials in parts by weight:

epoxy resin: 40-60 parts

Thixotropic agent: 1-2 parts of

Wetting and dispersing agent: 0.3 to 1.0 portion

150# solvent oil: 10-30 parts of

Talc powder: 10-30 parts of

KH 550: 2-8 parts of

Leveling agent: 0.3 to 1.0 portion

Defoaming agent: 0.3-1.0 part;

the component B is modified polyamide.

2. The epoxy sealing bottom layer material matched with the protective coating for the tunnel lining structure according to claim 1, wherein the component A comprises the following raw materials in parts by weight:

epoxy resin: 50 portions of

Thixotropic agent: 1.2 parts of

Wetting and dispersing agent: 0.3 part

150# solvent oil: 15 portions of

Talc powder: 15.5 parts of

KH 550: 6 portions of

Leveling agent: 0.8 portion of

Defoaming agent: 0.8 part.

3. The epoxy closed bottom layer material matched with the protective paint for the tunnel lining structure of claim 1, wherein the modified polyamide is an epoxy curing agent Ancamide 2766.

4. The tunnel lining structure protective paint matched epoxy closed bottom layer material as claimed in claim 1 or 2, wherein the thixotropic agent is fumed silica and/or polyurea thixotropic agent.

5. The tunnel lining structure protective paint matching epoxy closed bottom layer material as claimed in claim 1 or 2, wherein the epoxy resin is E-44 epoxy resin.

6. The tunnel lining structural protective coating matching epoxy closed bottom layer material as claimed in claim 1 or 2, characterized in that said wetting dispersant is TEGO Dispers 710.

7. The epoxy sealing bottom layer material matched with the protective coating for the tunnel lining structure as claimed in claim 1 or 2, wherein the talcum powder is a mixture of 1250 meshes and 800 meshes, and the mass ratio of 1250 meshes to 800 meshes of the talcum powder is (0.8:1) - (1.2: 1).

8. The tunnel lining structure protective paint matched epoxy sealing bottom layer material as claimed in claim 1 or 2, wherein the leveling agent is any one or a mixture of BYK-378, BYK-325, BYK-306, BYK-300 and AFCONA 3236.

9. The tunnel lining structure protective paint matched epoxy sealing bottom layer material as claimed in claim 1 or 2, wherein the defoaming agent is one or a mixture of BYK-555, BYK-A560, BYK-066N, BYK-A535 and BYK-A530.

10. The tunnel lining structure protective paint matching epoxy closed bottom layer material as claimed in claim 1 or 2, wherein the preparation method of the component A comprises the following steps:

weighing the raw materials, then sequentially adding the epoxy resin, the wetting dispersant, the No. 150 solvent oil, the thixotropic agent, the talcum powder, the defoaming agent and the flatting agent into a stirring tank, setting the rotating speed at 1100-1200r/min, and stirring at a high speed for 30 min; then pouring the mixture into a three-roll grinder for grinding, wherein the grinding temperature is 40-70 ℃, when the grinding fineness is 100 mu m, adding KH550, uniformly mixing and filtering to obtain the component A.

Technical Field

The invention relates to the technical field of coating primer, in particular to an epoxy sealing primer material matched with protective coating for a tunnel lining structure.

Background

After the tunnel is operated, the lining concrete structure generates various defects or diseases due to various reasons such as geological disasters, operation years, weather conditions and the like, and some defects such as lining cracking and dropping blocks, lining back cavities, honeycomb pitted surfaces, lining construction joint dislocation and the like occur in a short time after the tunnel is built and even in the tunnel construction process. The defects of tunnel lining quality easily cause the diseases of material cracking, lining chipping, water leakage and the like, and seriously threatens the operation safety of a line. A polyurethane system coating with certain elongation and high strength is added on the surface of the tunnel lining, so that the problem of lining block falling can be well solved. The conventional epoxy primer has high hardness, poor matching property with high-strength polyurethane, low adhesive force and peel strength, low flexible epoxy strength and difficulty in meeting a high-strength polyurethane protection system.

Most of the existing epoxy primer products have the defects that the toughness and the strength are difficult to meet simultaneously, and the primer with high closed-substrate strength and better toughness is rarely reported in China about the improvement methods.

Therefore, the technical personnel in the field need to solve the problem of how to provide an epoxy sealing bottom layer material matched with a protective coating for a tunnel lining structure, which has high strength, good toughness and higher adhesive force on a concrete substrate.

Disclosure of Invention

In view of the above, the invention provides an epoxy sealing underlayer material for matching with a protective coating of a tunnel lining structure, which has high strength, single component, excellent toughness and excellent sag resistance.

In order to achieve the purpose, the invention adopts the following technical scheme: an epoxy sealing bottom layer material matched with a protective coating of a tunnel lining structure comprises a component A and a component B, wherein the mass ratio of the component A to the component B is (2.7:1) - (4: 1);

the component A comprises the following raw materials in parts by weight:

epoxy resin: 40-60 parts

Thixotropic agent: 1-2 parts of

Wetting and dispersing agent: 0.3 to 1.0 portion

150# solvent oil: 10-30 parts of

Talc powder: 10-30 parts of

KH 550: 2-8 parts of

Leveling agent: 0.3 to 1.0 portion

Defoaming agent: 0.3-1.0 part;

the component B is modified polyamide.

The invention has the beneficial effects that: according to the invention, the curing agent, the paint assistant and the thixotropic material are compounded to prepare the epoxy sealing bottom layer material matched with the high-strength single-component tunnel lining structure protective paint, so that the adhesive force between the epoxy sealing bottom layer material and concrete is met, and the epoxy sealing bottom layer material matched with the high-strength single-component tunnel lining structure protective paint has higher adhesive force and peel strength, and has excellent toughness and sagging resistance.

Preferably, the component A comprises the following raw materials in parts by weight:

epoxy resin: 50 portions of

Thixotropic agent: 1.2 parts of

Wetting and dispersing agent: 0.3 part

150# solvent oil: 15 portions of

Talc powder: 15.5 parts of

KH 550: 6 portions of

Leveling agent: 0.8 portion of

Defoaming agent: 0.8 part.

Preferably, the modified polyamide is an epoxy curing agent Ancamide 2766.

Preferably, the thixotropic agent is fumed silica and/or a polyurea thixotropic agent. The polyurea thixotropic agent is BYK 410.

More preferably, the thixotropic agent is a mixture of fumed silica and a polyurea thixotropic agent; the weight portion of the fumed silica is 0.5-1, and the weight portion of the polyurea thixotropic agent is 0.5-1.

More preferably, the fumed silica is 0.7 part by weight, the polyurea thixotropic agent is BYK410, and the BYK410 is 0.7 part by weight.

The invention adopts a compound system of polyurea and fumed silica to control the once film-forming thickness and the leveling property of the film-forming. Polyurea belongs to an organic rheology modifier, a network structure is formed through the interaction of intermolecular hydrogen bonds, so that the polyurea has certain thixotropy, the intermolecular hydrogen bonds are damaged when the polyurea is subjected to physical shearing force, the viscosity is reduced, the intermolecular hydrogen bonds of the polyurea interact again after the shearing is stopped, so that the viscosity is increased and decreased, and the epoxy primer has fluidity and leveling property due to the slow speed of viscosity recovery, so that the out-of-control sagging of a vertical surface cannot be caused; the fumed silica belongs to an inorganic rheological modifier, thixotropy is generated mainly by depending on a hydrogen bond structure, the hydrogen bond is destroyed under the shearing force, the viscosity is reduced, the hydrogen bond structure is formed again after the shearing force is eliminated, the viscosity is recovered, good anti-sagging performance is provided, the hydrogen bond effect in the fumed silica can be weakened when the temperature is increased, and the viscosity is reduced. The two materials are compounded to provide good anti-sagging performance, and meanwhile, the application performance is improved. Therefore, the fumed silica accounts for 0.7 part by weight, the polyurea has the best effect when the polyurea accounts for 0.7 part by weight, and finally the product can reach the thickness of 100-300 microns of a one-time coating film.

Preferably, the epoxy resin is an E-44 epoxy resin.

Preferably, the wetting dispersant is TEGO Dispers 710.

Through a large number of dispersant screening tests, the invention finally determines that the TEGO Dispers710 is used as a dispersing auxiliary agent, and the application of the dispersing auxiliary agent improves the dispersing efficiency of the product, effectively reduces the viscosity of the product and increases the fluidity of the product.

Preferably, the talcum powder is a mixture of 1250 meshes and 800 meshes, and the mass ratio of the talcum powder of 1250 meshes to 800 meshes is (0.8:1) - (1.2: 1).

More preferably, the 1250-mesh part by weight of the talcum powder is 8.3 parts, and the 800-mesh part by weight of the talcum powder is 7.2 parts.

The invention adopts the talcum powder as a 1250-mesh and 800-mesh compound system to improve the strength of the epoxy primer so as to meet the requirements of high drawing strength and peeling strength. The 1250-mesh talcum powder has large specific surface area, large contact area with epoxy resin and good compatibility, forms a sea-island structure in the resin to increase the mechanical property of the system, can also increase certain strength by 800-mesh talcum powder, and meets the requirements of improving the mechanical strength of the primer and the construction property by compounding the 1250-mesh talcum powder and the 800-mesh talcum powder.

Preferably, the leveling agent is any one or a mixture of BYK-378, BYK-325, BYK-306, BYK-300 and AFCONA 3236.

The leveling agent can improve the permeability of the coating liquid, reduce the possibility of generating spots and stains during brushing, increase the coverage and ensure that the formed film is uniform and natural.

Preferably, the defoaming agent is any one or a mixture of BYK-555, BYK-A560, BYK-066N, BYK-A535 and BYK-A530.

Preferably, the preparation method of the component A comprises the following steps:

weighing the raw materials, sequentially adding the epoxy resin, the wetting dispersant, the talcum powder, the thixotropic agent, the antifoaming agent and the flatting agent into a stirring tank, setting the rotating speed at 1100-1200r/min, stirring at a high speed for 30min, pouring into a three-roll grinding machine for grinding, setting the grinding temperature at 40-50 ℃, adding KH550 when the grinding fineness reaches 100 mu m, uniformly mixing, and filtering to obtain the component A.

The invention also provides a preparation method of the epoxy sealing bottom layer material matched with the protective coating for the tunnel lining structure, which comprises the following steps: and uniformly mixing the component A and the component B to obtain the epoxy sealing bottom layer material.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention discloses an epoxy sealing bottom layer material matched with a protective coating of a tunnel lining structure, which meets the adhesive force between the epoxy sealing bottom layer material and concrete, has higher adhesive force and peel strength when matched with the protective coating of the tunnel lining structure, and has excellent toughness and sagging resistance.