Preparation method of coating structure for testing and coating structure

Abstract

The invention discloses a preparation method of a coating structure for testing, which comprises the following steps: S1, scraping putty on a substrate, and waiting for the putty to be dried and cured to form a putty layer; a plurality of putty layers are arranged in sequence, and at least one of the putty layers is a tracer putty layer formed by blade coating after a tracer and putty are compounded; s2, the putty layer farthest from the base plate is coated with permeable coating, the permeable coating permeates into the putty layer and can make contact with the tracer to enable the tracer to change color, and a permeable fixing layer is formed after the permeable coating is cured; the base plate, the putty layer and the permeation fixing layer are combined to form a coating structure for testing. The invention also discloses a test coating structure prepared by the method. The test coating structure which can be used for testing and displaying is prepared by utilizing the characteristic of color change due to contact between the tracer and the permeable coating, the penetration depth of the permeable coating can be clearly displayed through the coating structure, and the penetration result is striking and easy to observe.

Description

Technical Field

[0001] The invention relates to the technical field of coating testing, and in particular to a coating structure for testing and a preparation method thereof. Background Art

[0002] As urbanization increases, more and more old buildings in cities need to be repaired and renovated. During the repair process, the first problem to be dealt with is the reinforcement of the base layers such as walls and roofs. In this regard, penetrating primers for the interior and exterior walls of buildings have a good reinforcement and stabilization effect.

[0003] There have been a lot of studies and reports on the penetration reinforcement effect of penetrating primers, and good results have been achieved in engineering applications. As for the reinforcement performance test of penetrating primers, in "Coatings Industry" 2018 (048) 005, page 6 (P52-56, 65), Guo Jing et al. published "Research on the Test Method of Reinforcement Performance of Penetrating Primers for Building Interior and Exterior Walls", which disclosed three test methods: tape peeling area method, tape peeling mass method, and bonding strength test method.

[0004] Among them, the tape peeling area method can be used to conduct a simple qualitative inspection of the reinforcement performance of the penetrating primer, and the tape peeling mass method can be used to quantitatively test the reinforcement performance of the penetrating primer. The principle of both methods is to bond the primer with tape, and judge the permeability and reinforcement of the primer based on the amount of primer and putty layer removed by the tape. Due to the limited bonding force of the tape, only the surface of the primer is often torn off during the test. It may be effective for primers with low permeability, but it is difficult to tear off for primers with strong permeability. Both methods are difficult to work.

[0005] The bonding strength test method is a laboratory test method for the reinforcement performance of penetrating primer products. It can not only examine the penetration depth of the product, but also measure the reinforcement strength of the product to the substrate. The test results can quantitatively reflect the reinforcement performance of the penetrating primer products, but it needs to be tested in the laboratory and cannot be demonstrated on a large scale.

[0006] In addition, the above three methods respectively achieve the purpose of examining the penetration reinforcement performance of the primer by recording the area, weight or force value of the damaged reinforcement layer. It is difficult to clearly show the penetration depth of the primer, nor can it show the customer the reinforcement experience of hand touch. Similarly, there are similar problems when testing the penetration reinforcement performance of the interface agent. Summary of the invention

[0007] The object of the present invention is to provide a preparation method of a test coating structure and a coating structure to achieve a clear display of the penetration depth.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A method for preparing a coating structure for testing comprises the following steps:

[0010] S1. Apply putty on the substrate and wait for the putty to dry and solidify to form a putty layer; the putty layer is sequentially provided with several layers, and at least one layer is a tracer putty layer formed by applying the tracer after compounding the tracer and the putty;

[0011] S2. Apply a penetrating paint on the putty layer farthest from the substrate, the penetrating paint penetrates into the putty layer and can contact the tracer to change color, and the penetrating paint forms a penetrating fixed layer after curing; the substrate, the putty layer and the penetrating fixed layer are combined to form a coating structure for testing.

[0012] Furthermore, the method further comprises step S3. applying elastic topcoat on the permeable fixing layer to form an elastic surface layer, and placing the handle part into the elastic surface layer before the elastic surface layer is cured.

[0013] Furthermore, the method also includes step S4. Cutting each putty layer along a direction perpendicular to the surface of the substrate to form an observation section on the side of the putty layer.

[0014] Furthermore, the tracer is iron blue powder, and the penetrating coating contains silicate.

[0015] Furthermore, the penetrating coating comprises, by mass, 450-750 parts of water, 150-300 parts of emulsion, 7.5-15 parts of film-forming aid, 2-5 parts of wetting agent, 4-6 parts of stabilizer, and 100-250 parts of silicate mixture; the silicate mixture comprises one or more of silica sol, sodium silicate solution and potassium silicate solution.

[0016] Furthermore, the putty layer is sequentially arranged in two or more layers, and includes a non-tracing putty layer formed by directly scraping the putty, and the tracer putty layer and the non-tracing putty layer are alternately arranged.

[0017] Furthermore, the putty used for scraping the non-tracing putty layer includes, by mass, 10-20 parts of acrylic resin, 200-220 parts of water, 10-15 parts of hydrophobic dispersant, 3-4 parts of cellulose ether, 1-2 parts of defoaming agent, 1-3 parts of film-forming aid, and 700-730 parts of heavy calcium powder.

[0018] After the tracer is compounded with the putty, the tracer comprises, by mass, 10-20 parts of acrylic resin, 200-220 parts of water, 10-15 parts of hydrophobic dispersant, 3-4 parts of cellulose ether, 1-2 parts of defoaming agent, 1-3 parts of film-forming aid, 300-500 parts of tracer, and 230-430 parts of heavy calcium powder.

[0019] Furthermore, the pores inside the putty layer are larger than the particle size of the solid components in the penetrating coating, and the particle size of the solid components in the penetrating coating is 0.4 μm-1 μm.

[0020] A test coating structure is prepared by the test coating structure preparation method.

[0021] Furthermore, an elastic surface layer and a handle are provided on the permeable fixed layer. The handle includes a pull ring and a reinforcing matrix. The reinforcing matrix is ​​buried in the elastic surface layer and is in a hollow disc shape. The pull ring is fixedly connected to the reinforcing matrix and is located outside the elastic surface layer.

[0022] The present invention has the following beneficial effects:

[0023] 1. The present invention provides a method for preparing a test coating structure and a test coating structure prepared by the method. The present invention utilizes the contact color change characteristic between a tracer and a penetrating coating to prepare a test coating structure, through which the penetration depth of the penetrating coating can be clearly displayed, so that the penetration result is intuitive, eye-catching, and can be directly observed by the naked eye.

[0024] 2. The coating structure for the test is provided with a handle that can be pulled by hand, which is not only convenient for destroying and tearing off the coating structure for testing, but also enables intuitive experience of the reinforcement performance of the penetrating coating.

[0025] 3. The test coating structure can also be used as a display device to demonstrate the penetrating coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the coating structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the handle structure of the present invention.

[0028] Figure 3 for Figure 2 Schematic diagram of the AA section structure.

[0029] Explanation of the main component symbols: 1. Base plate; 2. Putty layer; 21. Tracer putty layer; 22. Non-tracer putty layer; 23. Observation section; 3. Penetration fixing layer; 4. Elastic surface layer; 5. Handle; 51. Pull ring; 52. Reinforced matrix; 521. Ring matrix; 522. Reinforcement rib; 523. Hollow part. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Embodiment 1

[0032] The present invention discloses a method for preparing a coating structure for testing, comprising the following steps:

[0033] S1. Apply putty on the substrate 1 and wait for the putty to dry and solidify to form a putty layer 2. The putty layer 2 is arranged in several layers in sequence, and each layer of putty needs to be dried for 1-2 hours at 40-60°C to solidify the putty, and the dried and solidified putty forms a putty layer 2. After the putty layer 2 is formed by sandpaper polishing and its thickness is controlled, the next layer of putty can be applied on the putty layer 2 to make the next layer of putty layer 2. Among the putty layers 2, at least one layer is a tracer putty layer 21 formed by compounding the tracer and putty and applying it.

[0034] The substrate 1 can be a matrix such as a cement board, a tile, a thermal insulation composite board, etc., and the tracer can be iron blue powder. In addition, when the putty layer 2 is set in two or more layers, in addition to the tracer putty layer 21, the putty layer 2 also includes a non-tracer putty layer 22 formed by directly scraping the conventional putty. The non-tracer putty layer 22 and the tracer putty layer 21 are alternately scraped and formed. After contacting with the penetrating paint, the boundary between the two is obvious, which can clearly show the number of layers infiltrated by the penetrating paint.

[0035] Preferably, the putty used when applying the non-tracing putty layer 22 is latex putty, which includes 10-20 parts of acrylic resin, 200-220 parts of water, 10-15 parts of hydrophobic dispersant, 3-4 parts of cellulose ether, 1-2 parts of defoaming agent, 1-3 parts of film-forming aid, and 700-730 parts of heavy calcium powder by mass.

[0036] When scraping the tracer putty layer 21, a compound putty of a tracer and a latex putty is selected. After the tracer and the latex putty are compounded, the mixture includes 10-20 parts of acrylic resin, 200-220 parts of water, 10-15 parts of hydrophobic dispersant, 3-4 parts of cellulose ether, 1-2 parts of defoaming agent, 1-3 parts of film-forming aid, 300-500 parts of tracer, and 230-430 parts of heavy calcium powder.

[0037] Among them, the acrylic resin preferably uses RS-9966A styrene-acrylic copolymer acrylic resin of Badfu Group Co., Ltd., the hydrophobic dispersant uses Dow Chemical 731A hydrophobic sodium salt dispersant, the cellulose ether uses HBR250 hydroxyethyl cellulose ether of Ashland (China) Investment Co., Ltd., the defoamer uses NXZ mineral oil defoamer of BASF China Co., Ltd., the film-forming aid uses dodecanol ester of Runtai New Materials Co., Ltd., the heavy calcium powder uses 325 mesh heavy calcium powder of Guangdong Fujian Building Materials (Jiaoling) Refining Co., Ltd., and the iron blue powder uses LA09-03 iron blue of Guangzhou Meidan Titanium White Pigment Co., Ltd. Compared with the conventional putty layer, the present invention makes improvements in the amount of acrylic resin and hydrophobic dispersant, and selects powders with appropriate coarseness and fineness, which is easier to penetrate.

[0038] S2. Apply penetrating paint on the putty layer 2 farthest from the substrate 1, that is, apply the primer, interface agent, etc. to be tested and displayed. The penetrating paint is applied in 3-5 layers, with an interval of 2-5 minutes between each layer. The total consumption during the application is 0.8-1kg / m 2 .

[0039] When the penetrating paint is applied, it can penetrate into the putty layer 2 and contact the tracer in the tracer putty layer 21, and the contact with the tracer causes the contacted tracer to change color. According to the color change of the tracer putty layer 21, the penetration depth of the applied penetrating paint can be clearly displayed. After the penetrating paint is cured, a penetration fixing layer 3 is formed, which is combined with the substrate 1 and the putty layer 2 to form a basic test coating structure.

[0040] Specifically, when iron blue powder is used as the tracer, the penetrating paint uses a paint containing silicate, which can ionize hydroxide ions and penetrate the iron blue powder (blue) in the contact tracer putty layer 21 to react and generate iron hydroxide to appear yellow-brown, clearly showing the penetration depth.

[0041] In this embodiment, the penetrating coating uses an interface agent containing silicate, and the penetrating coating includes 450-750 parts of water, 150-300 parts of emulsion, 7.5-15 parts of film-forming aid, 2-5 parts of wetting agent, 4-6 parts of stabilizer, and 100-250 parts of silicate mixture by weight. The silicate mixture can be one or more of silica sol, sodium silicate solution and potassium silicate solution.

[0042] The emulsion uses Acronal 7536 styrene / acrylate polymer emulsion from BASF China Ltd., the silicate mixture uses SLK-R131 from Jiangxi Silike New Materials Co., Ltd., the wetting agent uses wetting dispersant TAD 60 from Guangzhou Tuoxin Chemical Technology Co., Ltd., the film-forming aid uses dodecanol ester from Runtai New Materials Co., Ltd., and the stabilizer uses WJ-100 from Foshan Shunde Heye Chemical Co., Ltd.

[0043] In order to give full play to the penetration and curing effects of the penetrating paint, in the putty layer 2, coarser powder and less emulsion are used as film-forming substances to form a loose and porous coating. After forming, the pores inside the putty layer 2 should be larger than the particle size of the solid components in the penetrating paint. In the penetrating paint, the particle size of the solid components in the penetrating paint is between 0.4-1μm.

[0044] S3. Apply elastic topcoat on the penetration fixing layer 3 to form an elastic surface layer 4, and partially place the handle 5 into the elastic surface layer 4 before the elastic surface layer 4 is cured. The handle 5 can be firmly set in the elastic surface layer 4, and at the same time, the coating structure has the function of being directly tearable and the handle 5 is not easy to fall out when the coating structure is peeled off.

[0045] The handle 5 can be made of metal, with an elastic modulus of 68-200 and a Poisson's ratio of 0.3-0.34. The elastic topcoat is K50000 exterior acrylic elastic topcoat produced by GUC Energy Saving Technology Co., Ltd., with a tensile strength of 2.0MPa-3.0MPa and an elongation at break of 200%-450%.

[0046] S4. Cutting each layer of the putty layer 2 and the elastic surface layer 4 along a direction perpendicular to the surface of the substrate 1 can form an observation section 23 on the side of the putty layer 2, which can clearly show the penetration situation without tearing it off.

[0047] Embodiment 2

[0048] On the basis of the above-mentioned embodiment 1, Figure 1-3 As shown, the present invention also discloses a test coating structure, which is prepared by the test coating structure preparation method, and includes a substrate 1, a putty layer 2, and a penetration fixing layer 3. The prepared test coating structure can clearly show the penetration depth and number of penetration layers of the penetration type coating, and can not only be used for testing, but also as a display sample, so that customers can intuitively see the penetration performance of the coating.

[0049] The penetration fixing layer 3 of the test coating structure is also provided with an elastic surface layer 4 and a handle 5, and the handle 5 includes a pull ring 51 and a reinforcing matrix 52. Among them, the reinforcing matrix 52 is buried in the elastic surface layer 4 and is in a hollow disc shape, and the pull ring 51 is vertically fixedly connected to the reinforcing matrix 52 and is located outside the elastic surface layer 4. As one of the cases, the reinforcing matrix 52 is in a disc shape as a whole, including 3-5 inner and outer circular ring substrates 521 and a plurality of radially arranged reinforcing ribs 522, each reinforcing rib 522 is fixedly connected to each circular ring substrate 521, and a plurality of hollow parts 523 for the elastic coating to enter and exit are formed between the circular ring substrate 521 and the reinforcing rib 522. The reinforcing matrix 52 can increase the force-bearing surface and strengthen the connection strength with the elastic surface layer 4 and the putty layer 2. The pull ring 51 can be used to facilitate users to tear and destroy the coating structure by hand, thereby measuring the permeability and fixity of the penetrating coating, and can also provide people with a tactile reinforcement experience.

[0050] The test coating structure provided by the invention was evaluated, and multiple groups of controls were set up, as follows:

[0051]

[0052] The evaluation items include color rendering performance, displayability and reinforcement experience. The evaluation scores range from poor to good, with five levels of 1 point to 5 points. The evaluation results are as follows:

[0053]

[0054] It can be seen that the test coating structure provided by the present invention has excellent color rendering properties, can clearly show the penetration performance of the penetrating coating, and is easy to tear off, which can not only provide a good reinforcement experience, but also facilitate testing.

[0055] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A method for preparing a coating structure for testing, characterized in that: The following steps are involved: S1. Apply putty on the substrate and wait for the putty to dry and solidify to form a putty layer; the putty layer is sequentially provided with several layers, and at least one layer is a tracer putty layer formed by applying the tracer after compounding the tracer and the putty; S2. Apply a penetrating paint on the putty layer farthest from the substrate, the penetrating paint penetrates into the putty layer and can contact the tracer to change color, and the penetrating paint forms a penetrating fixed layer after curing; the substrate, the putty layer and the penetrating fixed layer are combined to form a coating structure for testing.

2. The method for preparing a test coating structure according to claim 1, characterized in that: The following steps are also included: S3. Applying an elastic topcoat on the permeable fixed layer to form an elastic surface layer, and placing the handle portion into the elastic surface layer before the elastic surface layer is cured.

3. The method for preparing a test coating structure according to claim 1, characterized in that: The following steps are also included: S4. Cut each putty layer along a direction perpendicular to the substrate surface to form an observation section on the side of the putty layer.

4. The method for preparing a test coating structure according to claim 1, characterized in that: The tracer is iron blue powder, and the penetrating paint contains silicate.

5. The method for preparing a test coating structure according to claim 4, characterized in that: The penetrating coating comprises 450-750 parts of water, 150-300 parts of emulsion, 7.5-15 parts of film-forming aid, 2-5 parts of wetting agent, 4-6 parts of stabilizer and 100-250 parts of silicate mixture by mass; the silicate mixture comprises one or more of silica sol, sodium silicate solution and potassium silicate solution.

6. The method for preparing a test coating structure according to claim 1, characterized in that: The putty layers are arranged in two or more layers in sequence, and include a non-tracing putty layer formed by directly scraping the putty, and the tracing putty layer and the non-tracing putty layer are arranged alternately.

7. The method for preparing a test coating structure according to claim 6, characterized in that: The putty used when scraping the non-tracing putty layer includes, by mass, 10-20 parts of acrylic resin, 200-220 parts of water, 10-15 parts of hydrophobic dispersant, 3-4 parts of cellulose ether, 1-2 parts of defoaming agent, 1-3 parts of film-forming aid, and 700-730 parts of heavy calcium powder; After the tracer is compounded with the putty, the tracer comprises, by mass, 10-20 parts of acrylic resin, 200-220 parts of water, 10-15 parts of hydrophobic dispersant, 3-4 parts of cellulose ether, 1-2 parts of defoaming agent, 1-3 parts of film-forming aid, 300-500 parts of tracer, and 230-430 parts of heavy calcium powder.

8. The method for preparing a test coating structure according to claim 1, characterized in that: The pores inside the putty layer are larger than the particle size of the solid components in the penetrating coating, and the particle size of the solid components in the penetrating coating is 0.4 μm-1 μm.

9. A test coating structure, prepared by the test coating structure preparation method according to any one of claims 1 to 8.

10. A test coating structure as claimed in claim 9, characterized in that: An elastic surface layer and a handle are arranged on the permeable fixed layer. The handle comprises a pull ring and a reinforcing matrix. The reinforcing matrix is ​​buried in the elastic surface layer and is in a hollow disc shape. The pull ring is fixedly connected to the reinforcing matrix and is located outside the elastic surface layer.

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