A crack-resistant metallic paint and a crack-resistant high-strength steel plate component, and their construction method.

Abstract

This application relates to the field of building decoration materials, and in particular to a crack-resistant metallic paint and a high-strength steel plate crack-resistant component, as well as their construction method. A crack-resistant metallic paint comprises the following raw materials in parts by weight: 300-500 parts fluorocarbon emulsion, 80-120 parts elastic emulsion, 10-40 parts active toughening agent, 90-110 parts metallic effect pigment, 30-40 parts film-forming aid, 1.5-2.5 parts dispersant, 15-20 parts thickener, and 280-350 parts water. By compounding the fluorocarbon emulsion and elastic emulsion and adding the active toughening agent, the paint film achieves an elongation at break ≥82%, a flexibility of 1mm without cracking on a shaft, and resistance to artificial aging ≥3000h without cracking, thus achieving a synergistic unity of high elasticity and high weather resistance.

Description

Technical Field

[0001] This application relates to the field of building decoration materials, and in particular to a crack-resistant metallic paint and a high-strength board crack-resistant component and its construction method. Background Technology

[0002] In the field of building exterior wall decoration, low-density (e.g., 50 kg / m³) molded polystyrene (EPS) boards are often used as decorative components to reduce costs and achieve complex shapes. To achieve a high-end metallic feel, imitation aluminum metallic paint is often applied to the surface of EPS components. The current common technical solution typically involves applying an alkali-resistant sealing primer followed by an imitation aluminum metallic paint topcoat to the EPS component substrate.

[0003] Regarding the aforementioned technologies, the applicant discovered that low-density EPS boards are soft and prone to deformation due to high thermal expansion and contraction rates, while traditional aluminum-look metallic paints, designed to achieve a high-hardness, high-gloss metallic effect, typically exhibit hard and brittle characteristics. The significant difference in deformation under varying temperature and humidity causes stress concentration at the paint film interface, leading to cracking and peeling of the paint film.

[0004] Therefore, how to fundamentally solve the cracking and peeling problems of aluminum-like metallic paint when applied to low-density EPS components has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] In order to reduce the probability of cracking and peeling when aluminum-like metallic paint is applied to low-density EPS components, this application provides a crack-resistant metallic paint, a high-strength board crack-resistant component, and its construction method.

[0006] In the first aspect, this application provides a crack-resistant metallic paint, which adopts the following technical solution:

[0007] A crack-resistant metallic paint comprises the following raw materials in parts by weight: 300-500 parts of fluorocarbon emulsion, 80-120 parts of elastic emulsion, 10-40 parts of active toughening agent, 90-110 parts of metallic effect pigment, 30-40 parts of film-forming aid, 1.5-2.5 parts of dispersant, 15-20 parts of thickener, and 280-350 parts of water.

[0008] By adopting the above technical solution, this solution forms an interpenetrating network structure by compounding fluorocarbon emulsion and elastic emulsion. Fluorocarbon provides super weather resistance, elasticity imparts flexibility, and active toughening agents are further embedded between molecular chains to increase slippage ability. This allows the paint film to maintain the weather resistance of fluorocarbon while increasing the elongation at break, thereby actively absorbing the micro-stress caused by temperature and humidity changes in the EPS substrate and preventing cracking from the source. At the same time, the metallic effect pigments can still be oriented in the elastic matrix to ensure that the metallic luster is not diminished by the introduction of flexibility, thus achieving a synergistic unity of high elasticity, high weather resistance, and high decorativeness.

[0009] The pattern of the groove is not limited to vertical grids, but can be extended to other regular geometric pattern arrays such as rhombus and honeycomb to achieve stress zoning and mechanical interlocking.

[0010] Furthermore, the weight ratio of resin solids content in the fluorocarbon emulsion to the elastic emulsion is (3-4):1.

[0011] By adopting the above technical solution, this ratio range precisely balances the glass transition temperature and crosslinking density of the coating film by adjusting the solid content ratio of fluorocarbon and elastic resin. This allows the rigid skeleton of fluorocarbon and the flexible segments of elastomer to form an optimal network structure. Under this ratio, the elongation at break of the coating film remains stable at a high level, while the artificial aging resistance time also remains at a long time. This avoids the dilemma of increased brittleness due to excessive fluorocarbon ratio or decreased weather resistance due to excessive elasticity ratio. At the same time, it ensures the compatibility of the two emulsions and avoids defects such as delamination and pinholes during construction.

[0012] Furthermore, the active toughening agent is a long-chain aliphatic compound, and its dosage accounts for 10-14% of the resin solid content.

[0013] By adopting the above technical solution, the long-chain aliphatic structure of the active toughening agent is distributed between the polymer chains during the resin curing process. By increasing the free volume and lowering the glass transition temperature, the molecular chains of the paint film can slide and dissipate energy when stretched. The dosage can be controlled within the range of 10-14% of the resin solid content to significantly improve the elongation at break. At the same time, it avoids excessive softening of the paint film, which would lead to a decrease in surface hardness and stain resistance. In particular, it enables the paint film to maintain its flexibility without cracking at low temperatures.

[0014] Furthermore, the metallic effect pigment is a non-floating aluminum powder with a particle size range of 10-60 μm.

[0015] By adopting the above technical solution, the non-floating aluminum powder surface is well compatible with the elastic paint film system after treatment. It can be evenly distributed in the paint film to form a parallel reflective layer. The particle size is controlled within the range of 10-60μm, which not only ensures sufficient hiding power and metallic luster, but also avoids the problems of insufficient hiding power due to excessively small particle size or surface roughness and reduced gloss due to excessively large particle size. At the same time, this particle size range matches the rheological properties of the elastic paint film, so it is not easy to clog the nozzle during spraying and the appearance is not damaged due to the deformation of the paint film.

[0016] Furthermore, the active toughening agent is selected from at least one of long-chain aliphatic diesters, epoxy-modified polysiloxanes, or hydroxyl-terminated polybutadiene.

[0017] By adopting the above technical solutions, the long-chain aliphatic diester molecules are flexible and have good compatibility with the acrylate system, which can effectively toughen the coating. The epoxy-modified polysiloxane can reduce the surface tension of the coating film and improve water resistance and stain resistance while toughening. The terminal hydroxyl groups of polybutadiene can react chemically with the resin system and chemically bond into the resin network. The toughening effect is long-lasting and does not migrate, avoiding the problem of performance degradation caused by the precipitation of traditional toughening agents over time. The three types can be flexibly selected or compounded according to cost and performance requirements.

[0018] Secondly, this application provides a high-strength plate crack-resistant component, which adopts the following technical solution:

[0019] A high-strength steel plate anti-cracking component comprises, from the inside out: an EPS base plate, a polymer adhesive mortar layer, a composite material liner, and a decorative coating; the decorative coating is any of the aforementioned anti-cracking metallic paint coatings; the EPS base plate has a regularly distributed array of grooves on the side near the composite material liner, and the composite material liner has a regularly distributed array of grooves on the side near the EPS base plate; the grooves on the EPS base plate and the grooves on the composite material liner are arranged in a crisscross pattern.

[0020] By adopting the above technical solution, the grooves on the EPS board and the composite material backing are arranged in a crisscross pattern. During construction, the polymer adhesive mortar is squeezed into the grooves and cured to form a "mushroom head" shaped two-way interlocking structure, which divides the continuous adhesive layer into multiple independent units. When the EPS base layer deforms due to changes in temperature and humidity, the stress is dispersed in the independent anchoring units and cannot be continuously transmitted to the topcoat layer. Combined with the active absorption of residual micro-stress by the anti-cracking metallic paint, a dual protection mechanism of "large stress blocking and micro-stress absorption" is formed, which improves the bonding strength. After 10 temperature change cycles from -30℃ to 80℃ and 6 months of outdoor exposure, the paint film remains intact without cracking.

[0021] Furthermore, the density of the EPS baseboard is 40-60 kg / m³.

[0022] By adopting the above technical solution, the density range enables the EPS board to have sufficient compressive and tensile strength to support the weight of the lining and topcoat without deforming itself. At the same time, the strength of the groove wall is sufficient to withstand the stress of the mortar anchoring structure without damage. The porous structure of the EPS board within the density range can also form a good mechanical interlock with the mortar, avoiding the problems of insufficient strength due to excessively low density or increased cost and reduced interlocking effect with mortar due to excessively high density. This achieves a balance between structural stability and material economy.

[0023] Furthermore, the composite material liner has a thickness of 4-6 mm, a bending strength of ≥15 MPa, and a water absorption rate of ≤5%.

[0024] By adopting the above technical solution, the 4-6mm thick composite material liner provides sufficient rigidity to isolate the deformation stress of the EPS base layer outside the topcoat layer. The bending strength ≥15MPa ensures that the liner itself will not crack or warp under the action of external forces such as wind pressure and temperature changes. The water absorption rate ≤5% prevents moisture from penetrating into the EPS layer and causing freeze-thaw damage and mold growth. The three factors work together to ensure that the topcoat always adheres to a stable and durable foundation, guaranteeing the long service life of the entire coating system.

[0025] Furthermore, the polymer adhesive mortar layer is a two-component system, comprising:

[0026] Component A, by weight, includes 450-500 parts water, 7-9 parts hydroxyethyl cellulose, 0.8-1.5 parts defoamer, 3-5 parts multifunctional additive, 1.5-2.5 parts bactericide, and 480-520 parts ethylene-vinyl acetate copolymer emulsion.

[0027] Component B, by weight, includes 350-450 parts cement, 550-650 parts 50-100 mesh silica sand, 0-120 parts 150-200 mesh silica sand, and 0-1.5 parts short fiber.

[0028] By adopting the above technical solution, this mortar formula provides high bonding strength and flexibility by forming an organic-inorganic composite system with ethylene-vinyl acetate copolymer emulsion and cement. Hydroxyethyl cellulose thickens and retains water to ensure that the mortar is fully filled in the groove without flowing. The gradation of 50-100 mesh and 150-200 mesh silica sand gives the mortar a suitable particle size distribution so that it can enter the bottom of the dovetail groove and fill it densely. Short fibers form a three-dimensional network in the mortar to improve crack resistance. The synergy of the components enables the mortar to completely fill the groove and form a complete interlocking structure, improving the bonding strength. Moreover, the mortar layer itself does not crack during temperature change cycles.

[0029] Thirdly, this application provides a construction method for a high-strength steel plate anti-cracking component, which adopts the following technical solution:

[0030] A construction method for a high-strength steel plate anti-cracking component includes the following steps:

[0031] S1. Substrate treatment: Apply a special interface agent to the surface of the EPS substrate board;

[0032] S2. Component composite: Apply polymer adhesive mortar to the grooved side of the composite material liner and adhere it to the grooved side of the EPS baseboard. Compress the mortar to fill all the grooves, forming a two-way interlocking mechanical anchoring structure. Level and fix it.

[0033] S3. Coating: Apply primer to the composite material lining substrate, and then spray anti-cracking metallic paint using the "thin spray multiple coats" method. The dry film thickness of each coat is ≤40μm, and the total thickness is 80-120μm. The layers must be touch dry between coats.

[0034] By adopting the above technical solutions, this construction method enhances the surface activity of EPS through S1 interface agent treatment to improve the chemical adhesion to mortar. The S2 full scraping and full squeezing operation allows the mortar to enter the bottom of the groove and remove air, ensuring the formation of a continuous, dense, two-way interlocking anchoring structure. The S3 thin spraying multi-coat process controls the thickness of each dry film to within 40μm to avoid excessive thickness in a single spray, which would lead to the accumulation of internal stress. The interlayer touch-drying ensures interlayer adhesion, so that the structural design advantages of the product can be fully realized in actual engineering, ensuring the stability and controllability of construction quality.

[0035] In summary, this application has the following beneficial effects:

[0036] 1. By compounding fluorocarbon emulsion with elastic emulsion and adding active toughening agent, the elongation at break of the paint film is ≥82%, the flexibility of a 1mm shaft bar is without cracks, and the artificial aging resistance is ≥3000h without cracking, thus achieving a synergistic unity of high elasticity and high weather resistance.

[0037] 2. By setting bidirectional crisscrossing grooves between the EPS board and the composite material liner, a "mushroom head" interlocking structure is formed, which makes the pull-out strength ≥0.65MPa, which is 219% higher than the structure without grooves, and it can withstand 10 temperature changes without cracking.

[0038] 3. The synergistic effect of the dual mechanisms of "elastic topcoat absorbing micro-stress" and "groove structure blocking large stress" enables the overall service life of components to reach 2-3 times that of traditional processes, fundamentally solving the technical problem of metal paint cracking on low-density EPS components. Attached Figure Description

[0039] Figure 1 This is a structural schematic diagram of the component used in Example 1 of this application;

[0040] Figure 2 This is a schematic diagram of the exploded structure of the component.

[0041] In the diagram, 1 is the EPS baseboard; 11 is the groove; 2 is the polymer bonding mortar layer; 3 is the composite material lining board; and 4 is the finishing coating. Detailed Implementation

[0042] The present application will be further described in detail below with reference to the embodiments.

[0043] Example of raw material and intermediate preparation

[0044] raw material

[0045] It should be noted that: in the following examples, unless otherwise specified, the conditions shall be in accordance with conventional conditions or the manufacturer's recommended conditions; and the raw materials used in the following examples, unless otherwise specified, shall be from commercially available sources.

[0046] Fluorocarbon emulsion, FM261, Wanbo New Materials, resin solids content 40%;

[0047] Elastic acrylic emulsion, 8015A, Wanhua emulsion, resin solids content 50%;

[0048] Active toughening agent (hydroxyl-terminated polybutadiene), HTPB, industrial grade;

[0049] Non-floating aluminum powder, particle size 30μm, Fujian Kuncai;

[0050] Film-forming aid, alcohol ester dodecyl, BADF Company;

[0051] Dispersant 123K, Arkema Chemicals;

[0052] Thickener (U505), polyurethane type, Wanhua;

[0053] Thickener (TT-935), alkali-swellable type, Dow Chemical;

[0054] Thickener (A801), associative type, Wanhua;

[0055] Hydroxyethyl cellulose, 7106P, Shandong Heda;

[0056] Defoamer 1827, Beijing Guzhengben;

[0057] Multifunctional additive, KNE-905, Beijing Konuon;

[0058] fungicide K15F, fungicide DMB, Lonza;

[0059] Ethylene-vinyl acetate copolymer emulsion, BJ-707, Sinopec;

[0060] Cement, PO42.5, Jidong Cement;

[0061] Short fiber, TB-203, Zibo Longen;

[0062] EPS baseboard, density 50kg / m³ 3 ;

[0063] Fiber cement board, 5mm thick;

[0064] Wetting agent, 7100, Beijing Guzhengben.

[0065] Preparation Example

[0066] A polymer adhesive mortar, the preparation method of which is as follows:

[0067] 1) Preparation of Component A

[0068] Mix 50 kg of water, 0.8 kg of hydroxyethyl cellulose, 0.1 kg of defoamer, 0.4 kg of multifunctional additive, 0.2 kg of bactericide, and 50 kg of ethylene-vinyl acetate copolymer evenly to obtain component A;

[0069] 2) Preparation of Component B

[0070] Mix 40 kg of cement, 60 kg of 50-100 mesh silica sand, 60 kg of 150-200 mesh silica sand, and 0.1 kg of short fibers evenly to obtain component B.

[0071] When using, mix component A and component B at a weight ratio of 1:4.

[0072] Example

[0073] Example 1

[0074] A crack-resistant metallic paint, the preparation method of which is as follows:

[0075] 1) Add water, dispersant, wetting agent, defoamer, ethylene glycol, and film-forming aid in sequence according to the proportions in Table 1 while stirring, and disperse at 500 rpm for 3 minutes;

[0076] 2) Add metallic effect pigments and multifunctional additives, increase the rotation speed to 800 rpm, and disperse for 8 minutes;

[0077] 3) Add fluorocarbon emulsion, elastic emulsion, and active toughening agent, and disperse at a constant speed for 5 minutes;

[0078] 4) Add thickener and bactericide in sequence, disperse for 8 minutes, and the product is ready.

[0079] Table 1 Raw material ratio table for Examples 1-3

[0080]

[0081] The thickeners include U505 thickener, TT-935 thickener, and A801 ​​thickener in a weight ratio of 1:1:6; the bactericides include K15F bactericide and DMB bactericide in a weight ratio of 1:1; and the metallic effect pigment is non-floating aluminum powder.

[0082] Example 4

[0083] Unlike Example 3, the amount of elastic emulsion used in Example 4 is 100 kg.

[0084] Example 5

[0085] Unlike Example 2, the amount of active toughening agent used in Example 5 is 20 kg.

[0086] Example 6

[0087] Unlike Example 2, the amount of active toughening agent used in Example 6 is 28 kg.

[0088] Example 7

[0089] Unlike Example 2, the particle size of the non-floating aluminum powder in Example 7 is 80 μm.

[0090] Comparative Example

[0091] Comparative Example 1

[0092] Unlike Example 1, Comparative Example 1 used an equal amount of fluorocarbon emulsion to replace the elastic emulsion.

[0093] Comparative Example 2

[0094] Unlike Example 1, Comparative Example 2 uses an equal amount of elastic emulsion instead of fluorocarbon emulsion.

[0095] Comparative Example 3

[0096] Unlike Example 1, Comparative Example 3 does not contain an active toughening agent.

[0097] Application examples

[0098] Application Example 1

[0099] A high-strength steel plate anti-cracking component comprises, from the inside out: an EPS base board 1, a polymer adhesive mortar layer 2, a composite material liner 3, and a finishing coating 4. The EPS base board has a density of 50 kg / m³. The EPS base board 1 has a regularly distributed array of grooves 11 on the side near the composite material liner 3. The cross-section of each groove 11 is a trapezoidal or dovetail shape (i.e., a "narrowing" shape) with a narrower outer edge and a wider inner edge. The polymer adhesive mortar layer 2 is formed by curing the polymer adhesive mortar from Preparation Example 1. The composite material liner 3 is a fiber cement board with a thickness of 5 mm, a bending strength ≥15 MPa, and a water absorption rate ≤5%. The composite material liner 3 has a regularly distributed array of grooves 11 on the side near the EPS base board 1. The cross-section of each groove 11 is a trapezoidal or dovetail shape (i.e., a "narrowing" shape) with a narrower outer edge and a wider inner edge. The grooves 11 on the EPS base board 1 and the grooves 11 on the composite material liner 3 are arranged in a crisscross pattern. The finishing coating 4 is obtained by applying the anti-cracking metallic paint obtained in Example 1.

[0100] The preparation method of high-strength steel anti-cracking components is as follows:

[0101] S1. Substrate treatment: Apply a special interface agent to the surface of the EPS substrate 1 where the groove 11 is provided;

[0102] S2. Component composite: Polymer adhesive mortar prepared in Example 1 is fully scraped on one side of the composite material liner 3 with groove 11, and then pasted onto the surface of the EPS base plate 1 with groove 11. The mortar is fully squeezed to fill all grooves 11, forming a two-way interlocking mechanical anchoring structure. The surface is then leveled and fixed.

[0103] S3. Coating: Apply primer to the composite material lining plate 3 base layer, and then spray the anti-cracking metallic paint prepared in Example 1 using an airless spraying equipment. The coating is applied in 3 coats: First coat: thin spray, dry film thickness 30μm, dry for 2 hours; Second coat: thin spray, dry film thickness 35μm, dry for 2 hours; Third coat: thin spray, dry film thickness 35μm, total thickness 100μm. The layers must be touch dry between coats.

[0104] Application Example 2-7

[0105] Unlike Application Example 1, the anti-cracking metallic paints in Application Examples 2-7 are derived from Examples 2-7, respectively.

[0106] Comparative application examples

[0107] Comparative Application Examples 1-3

[0108] Unlike Application Example 1, the anti-cracking metallic paints in Comparative Application Examples 1-3 are derived from Comparative Examples 1-3.

[0109] Comparative Application Example 4

[0110] Unlike Application Example 1, neither the EPS baseboard nor the composite material liner in Application Example 4 has grooves; their surfaces are flat.

[0111] Comparative Application Example 5

[0112] Unlike Application Example 1, in Comparative Application Example 5, the grooves on both the EPS baseboard and the composite material liner are longitudinal (parallel in the same direction), rather than crisscrossed.

[0113] Performance testing

[0114] Perform performance testing using the following methods:

[0115] Elongation at break of paint film, GB / T 16777-2008, tensile speed 50 mm / min, test temperature 23±2℃;

[0116] Coating film flexibility, GB / T 1731-2020, 1mm shaft bending test;

[0117] Pull-out strength (adhesion), JG / T 287-2013, tensile bond strength with EPS baseboard;

[0118] Artificial weathering resistance, GB / T 1865-2009, xenon lamp aging test, observe the cracking of the paint film;

[0119] Metallic luster, GB / T 9754-2025, tested with a 60° gloss meter;

[0120] Water resistance, GB / T 1733-1993, immerse in water for 240 hours and observe bubbling and peeling;

[0121] Impact resistance, GB / T 1732-2020 50cm, falling ball impact test.

[0122] Table 2 Performance test results of metallic paint

[0123]

[0124] As can be seen from the table above:

[0125] Examples 1-7 all exhibited elongation at break exceeding 82%, with a 1mm flexible shaft showing no cracks and remaining crack-free after 3000 hours of artificial aging. This indicates that the blending of fluorocarbon emulsion and elastic emulsion forms an ideal interpenetrating network structure, maintaining the weather resistance of fluorocarbon while introducing the flexibility of elastomers.

[0126] Comparative Example 1 (non-elastic emulsion) had an elongation at break of only 5%, exhibiting flexibility cracking and microcracks appearing after 500 hours of aging. Comparative Example 2 (fluorocarbon-free emulsion) had an elongation at break of 94%, but microcracks appeared after only 800 hours of aging. This demonstrates that both are indispensable, and neither can simultaneously meet the requirements for flexibility and weather resistance when used alone.

[0127] Comparative Example 3 (without active toughening agent) showed an elongation at break of only 42%, indicating the presence of microcracks in the coating. Compared to Example 2 (with active toughening agent, elongation at break of 88%), the active toughening agent increased the elongation at break by 109%, demonstrating its key role in significantly enhancing the flexibility of the coating film.

[0128] Examples 2 and 4 showed elongation at break of 88% and 85% respectively, both exceeding 85%, exhibiting flexibility without cracks and remaining crack-free after 3000 hours of aging. Example 1, with an elongation at break of 82%, was still acceptable, but its aging resistance slightly decreased. Example 3, with an elongation at break of 91%, while the highest, approached the performance limit of excessively high fluorocarbon content; further increasing the fluorocarbon content would lead to a sharp decrease in flexibility. This demonstrates that limiting the resin solids content ratio to (3-4):1 ensures a balance between excellent flexibility and weather resistance while allowing for a reasonable process window in actual production, thus proving reasonable.

[0129] Example 5 (20 kg of active toughening agent, accounting for 10% of the resin solid content) showed an elongation at break of 86%, and Example 6 (28 kg of active toughening agent, accounting for 14% of the resin solid content) showed an elongation at break of 89%, both meeting the requirements for crack prevention. Compared with Comparative Example 3 (without active toughening agent, elongation at break of 42%), the improvement was 105%-112%.

[0130] Table 3 Component performance test results

[0131]

[0132] Application Example 1 shows a pull-out strength of 0.67 MPa and no cracking after 10 temperature cycles, with the failure interface located inside the EPS (indicating that the bond strength exceeds the EPS body strength). In contrast, Application Example 4 (without grooves) shows a pull-out strength of only 0.21 MPa and cracking after 3 cycles; Application Example 5 (with parallel grooves) shows a pull-out strength of 0.32 MPa and cracking after 5 cycles. This demonstrates that the "mushroom head" interlocking structure formed by the bidirectional crisscrossing grooves is beneficial for achieving high-strength bonding and stress dispersion.

[0133] Compared to Application Example 1 (without an elastic coating), which had a pull-out strength of 0.28 MPa but cracked after only 4 temperature changes, Application Example 3 (without an active toughening agent) had a pull-out strength of 0.42 MPa and cracked after 6 temperature changes. Application Example 1, however, withstood 10 temperature changes without cracking, demonstrating that the dual mechanisms of "elastic topcoat absorbing micro-stress" and "groove structure blocking large stress" are indispensable and work synergistically to achieve optimal temperature resistance.

[0134] Application Example 1 shows a pull-out strength of 0.67 MPa, which is 219% higher than Comparative Application Example 4 (without grooves), 109% higher than Comparative Application Example 5 (parallel grooves), and 139% higher than Comparative Application Example 1 (without elastic paint film). This demonstrates that the technical solution of this application significantly improves adhesion, and the failure interface occurs within the EPS, indicating that the bonding strength exceeds the strength of the EPS body.

[0135] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A crack-resistant metallic paint, characterized by, The fluorocarbon emulsion, the elastic emulsion, the active toughening agent, the metal effect pigment, the film forming aid, the dispersing agent, the thickening agent and water are mixed to form the paint.

2. The anti-cracking metallic paint according to claim 1, characterized in that, The weight ratio of the resin solid content in the fluorocarbon emulsion and the elastic emulsion is (3-4):

1.

3. The anti-cracking metallic paint according to claim 1, characterized in that, The active toughening agent is a long-chain aliphatic compound, and the amount of the active toughening agent accounts for 10-14% of the resin solid content.

4. The anti-cracking metallic paint according to claim 1, characterized in that, The metal effect pigment is non-floating aluminum powder, and the particle size range is 10-60 μm.

5. The anti-cracking metallic paint according to claim 1, wherein The active toughening agent is at least one selected from long-chain aliphatic dibasic acid ester, epoxy-modified polysiloxane or hydroxyl-terminated polybutadiene.

6. A high-strength sheet anti-cracking member characterized by comprising: From inside to outside, the composite material lining board and the finishing coating layer are sequentially arranged, the finishing coating layer is the anti-cracking metallic paint coating layer of any one of claims 1-5, the EPS base plate is provided with a regular groove array on the side close to the composite material lining board, and the composite material lining board is provided with a regular groove array on the side close to the EPS base plate.

7. The high-strength sheet anti-cracking member according to claim 6, characterized by The bulk density of the EPS base plate is 40-60 kg / m3.

8. The high-strength sheet anti-cracking member according to claim 7, characterized by The thickness of the composite material lining board is 4-6 mm, the bending strength is greater than or equal to 15 MPa, and the water absorption rate is less than or equal to 5%.

9. The high-strength sheet anti-cracking member according to claim 6, characterized by The polymer adhesive mortar of the polymer adhesive mortar layer is a two-component system, and includes: A component, including water 450-500 parts, hydroxyethyl cellulose 7-9 parts, defoaming agent 0.8-1.5 parts, multifunctional additive 3-5 parts, bactericide 1.5-2.5 parts, and ethylene-vinyl acetate copolymer emulsion 480-520 parts by weight of the A component; B component, including cement 350-450 parts, 50-100 mesh silica sand 550-650 parts, 150-200 mesh silica sand 0-120 parts, and short fibers 0-1.5 parts by weight of the B component.

10. A method of constructing a high-strength-plate anti-cracking member according to any one of claims 6 to 9, characterized by, The method includes the following steps: S1. Base layer treatment: brushing a special interface agent on the surface of the EPS base plate; S2. Component compounding: fully scraping the polymer adhesive mortar on the side of the composite material lining board provided with grooves, and pasting the composite material lining board on the surface of the side of the EPS base plate provided with grooves, fully extruding the mortar to fill all the grooves, forming a bidirectional interlocking mechanical anchoring structure, leveling and fixing; S3. Paint layer coating: brushing a primer on the base layer of the composite material lining board, and then spraying the anti-cracking metallic paint in the "thin spraying and multiple spraying" mode, the dry film thickness of each pass is less than or equal to 40 μm, the total thickness is 80-120 μm, and the interlayer needs to be dry and transparent.

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