A method of painting a rock wool fiberboard, a rock wool fiberboard painted with paint

Abstract

The application provides a rock wool fiberboard paint coating method and a rock wool fiberboard coated with paint, and belongs to the technical field of rock wool fiberboards. The rock wool fiberboard is coated with a permeable UV primer layer, a filling UV primer layer, a covering UV primer layer, a midcoat, a topcoat and a transparent protective paint layer in sequence on the surface of the rock wool fiberboard, wherein the permeable UV primer layer and the filling UV primer layer have permeability and play the leveling and filling effects; the covering UV primer layer has covering property, covers the color of the rock wool fiberboard itself and prevents color difference of the board when the subsequent topcoat is coated. The midcoat can improve the adhesion of the primer and the topcoat; the topcoat can not only give the paint surface rich and bright color, but also give the paint surface good weather resistance, hardness and scratch resistance; and the transparent protective paint layer can protect the paint surface and increase the hardness and scratch resistance of the paint surface. The paint surface obtained by the application has excellent aesthetic effect, good wear resistance, scratch resistance and weather resistance.

Description

Technical Field

[0001] This invention relates to the field of rock wool fiberboard technology, and particularly to a method for applying paint to rock wool fiberboard and a rock wool fiberboard coated with paint. Background Technology

[0002] Rock wool fiberboard is an inorganic fiberboard made primarily from basalt through high-temperature melting and processing. As a new type of building decoration material, rock wool fiberboard boasts advantages such as high strength, thermal insulation, waterproofing, and fire resistance, and is increasingly favored by the public.

[0003] While rock wool fiberboard boasts the aforementioned advantages, its drawbacks as a decorative surface cannot be ignored. Rock wool fiberboard itself lacks aesthetic appeal, requiring painting before it can be used for building decoration. However, because rock wool fiberboard is made by hot-pressing rock wool fibers, its surface porosity is relatively high, making painting difficult. Furthermore, given its long-term outdoor use, existing painting processes struggle to meet its requirements for weather resistance and scratch resistance. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a method for painting the surface of rock wool fiberboard and a rock wool fiberboard with a painted surface. The painted surface obtained by the painting method provided by this invention has good scratch resistance and weather resistance, and also has excellent aesthetic effect.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] This invention provides a method for painting rock wool fiberboard, comprising the following steps:

[0007] (1) The rock wool fiberboard is sanded, coated with penetrating UV primer by roller, heated and dried under ultraviolet light in sequence to obtain a rock wool fiberboard coated with a layer of primer.

[0008] (2) A filling UV primer is rolled onto the surface of the rock wool fiberboard coated with a layer of primer and then UV cured to obtain a rock wool fiberboard coated with two layers of primer.

[0009] (3) A cover UV primer is rolled onto the surface of the rock wool fiberboard coated with two layers of primer and then UV cured to obtain a rock wool fiberboard coated with three layers of primer.

[0010] (4) The rock wool fiberboard coated with three layers of primer is sanded, coated with intermediate paint by roller and heat cured to make the paint surface semi-dry, and thus obtains a rock wool fiberboard coated with intermediate paint.

[0011] (5) Spray a topcoat onto the surface of the rock wool fiberboard coated with intermediate paint, and heat and dry it to obtain a rock wool fiberboard coated with topcoat.

[0012] (6) Spray a transparent protective paint onto the surface of the rock wool fiberboard coated with topcoat and cure it with ultraviolet light to obtain a rock wool fiberboard coated with paint.

[0013] The rock wool fiberboard is prepared by crushing rock wool fibers, adding adhesives, and hot pressing. The raw materials for preparing the rock wool fibers include basalt, iron ore slag, dolomite, and rock wool solid waste.

[0014] Preferably, in step (1), the abrasive used for sanding is 240 mesh sand;

[0015] The main components of the penetrating UV primer include polyurethane resin, acrylic resin and epoxy resin, and the mass ratio of polyurethane resin, acrylic resin and epoxy resin is 2:1:1.

[0016] The roller coating amount of the penetrating UV primer is 30-100 g / m². 2 ,

[0017] The heating temperature is 30–80°C, and the heating time is 2–6 minutes.

[0018] Preferably, in step (2), the main components of the filler UV primer include epoxy resin, and also include one of titanium dioxide, putty powder, and gypsum powder;

[0019] The roller coating amount of the filler UV primer is 20-80 g / m². 2 .

[0020] Preferably, in step (3), the opaque UV primer is white in color and its main components include epoxy resin, as well as one of titanium dioxide, putty powder, and gypsum powder.

[0021] Preferably, the opaque UV primer is applied in two roller coats, with the first roller coat leaving the opaque UV primer semi-dry and the second roller coat leaving it fully dry.

[0022] The single roller coating weight of the opaque primer is 20–80 g / m². 2 .

[0023] Preferably, in step (4), the abrasive used for sanding is 320 mesh abrasive;

[0024] The main components of the intermediate coating include epoxy resin and solvent;

[0025] The roller coating amount of the intermediate coat is 20-80 g / m². 2 ;

[0026] The thermosetting temperature is 45–50°C, and the time is 6–8 minutes.

[0027] Preferably, in step (5), the topcoat includes one or more of the following: topcoat, acrylic topcoat, and weather-resistant polyurethane topcoat;

[0028] The topcoat application rate is 80–180 g / m². 2 .

[0029] Preferably, in step (5), the heating and drying is a programmed heating and drying process, which includes the following sequential steps:

[0030] Heat at 20–60℃ for 15–30 minutes;

[0031] Heat at 40–80℃ for 1–2.5 hours;

[0032] Heat at 20–60°C for 10–30 minutes.

[0033] Preferably, in step (6), the main components of the transparent protective varnish include acrylic resin and methyl methacrylate;

[0034] The application rate of the transparent protective varnish is 10–50 g / m². 2 .

[0035] The present invention provides a rock wool fiber board with a painted surface obtained by the above method, comprising a rock wool fiber board and a painted surface coated on the surface of the rock wool fiber board;

[0036] The paint finish comprises, in sequence, a penetrating UV primer layer, a filling UV primer layer, a covering UV primer layer, a mid-coat layer, a topcoat layer, and a transparent protective paint layer.

[0037] This invention provides a method for coating rock wool fiberboard. The method involves sequentially coating the surface of the rock wool fiberboard with a penetrating UV primer layer, a filling UV primer layer, a covering UV primer layer, a mid-coat layer, a topcoat layer, and a transparent protective coating layer. The penetrating and filling UV primer layers are penetrating, providing leveling and filling effects. The covering UV primer layer provides coverage, concealing the natural color of the rock wool fiberboard and preventing color differences during subsequent topcoat application. The mid-coat layer improves the adhesion between the primer and topcoat. The topcoat layer imparts rich and vibrant colors, as well as good weather resistance, hardness, and scratch resistance. The transparent protective coating layer protects the paint surface and also increases its hardness and scratch resistance. Example results show that the coating obtained using the method described in this invention has excellent aesthetic effects and good wear resistance, scratch resistance, and weather resistance. Attached Figure Description

[0038] Figure 1The image shows a physical picture of the painted rock wool fiberboard obtained in Example 1 as an outdoor building decorative panel.

[0039] Figure 2 This is a weather resistance test report for the painted rock wool fiberboards obtained in Examples 1-3. Detailed Implementation

[0040] This invention provides a method for painting rock wool fiberboard, comprising the following steps:

[0041] (1) The rock wool fiberboard is sanded, coated with penetrating UV primer by roller, heated and dried under ultraviolet light in sequence to obtain a rock wool fiberboard coated with a layer of primer.

[0042] (2) A filling UV primer is rolled onto the surface of the rock wool fiberboard coated with a layer of primer and then UV cured to obtain a rock wool fiberboard coated with two layers of primer.

[0043] (3) A cover UV primer is rolled onto the surface of the rock wool fiberboard coated with two layers of primer and then UV cured to obtain a rock wool fiberboard coated with three layers of primer.

[0044] (4) The rock wool fiberboard coated with three layers of primer is sanded, coated with intermediate paint by roller and heat cured to make the paint surface semi-dry, and thus obtains a rock wool fiberboard coated with intermediate paint.

[0045] (5) Spray a topcoat onto the surface of the rock wool fiberboard coated with intermediate paint, and heat and dry it to obtain a rock wool fiberboard coated with topcoat.

[0046] (6) Spray a transparent protective paint onto the surface of the rock wool fiberboard coated with topcoat and cure it with ultraviolet light to obtain a rock wool fiberboard coated with paint.

[0047] The rock wool fiberboard is prepared by crushing rock wool fibers, adding adhesives, and hot pressing. The raw materials for preparing the rock wool fibers include basalt, iron ore slag, dolomite, and rock wool solid waste.

[0048] In this invention, the method for preparing the rock wool fiberboard preferably includes the following steps:

[0049] Provide rock wool fiber, wherein the raw materials for preparing the rock wool fiber include basalt, iron ore slag, dolomite, and rock wool solid waste;

[0050] The rock wool fibers are crushed, combed, and dispersed. Water, water-repellent agent, and flame retardant are added during the crushing process to obtain short rock wool fibers.

[0051] The rock wool short fibers are uniformly mixed with adhesive, evenly laid out, and pre-formed under steam conditions to obtain a pre-formed board;

[0052] The preformed board is hot-pressed to obtain rock wool fiber board;

[0053] The adhesive content in the rock wool fiberboard is 8-14% by mass.

[0054] In this invention, the preferred method for preparing the rock wool fiber is electric furnace melting, which specifically includes the following steps:

[0055] (1) Provide rock wool raw materials with the following mass percentages:

[0056]

[0057] The particle size of the rock wool raw material is 0.5–30 mm;

[0058] (2) The rock wool raw materials are mixed and melted in an electric furnace to obtain rock wool slurry;

[0059] (3) The rock wool slurry is centrifuged into fibers and collected to obtain rock wool fibers.

[0060] In this invention, the rock wool raw material used comprises 43-55% basalt, preferably 45-50%, by mass percentage. The basalt in this invention comprises SiO2, Al2O3, CaO, MgO, Fe2O3, Na2O, K2O, FeO, and TiO2. The basalt particle size in this invention is preferably 0.5-30 mm, more preferably 1-20 mm, and even more preferably 5-10 mm.

[0061] The rock wool raw material used in this invention comprises 25-44% iron ore slag, preferably 30-40%, and more preferably 35%, by mass percentage. In this invention, the iron ore slag is preferably sourced from a steel plant, and its main components include SiO2, Al2O3, MgO, CaO, Fe2O3, and TiO2. In this invention, the particle size of the iron ore slag is preferably 0.5-30 mm, more preferably 1-20 mm, and even more preferably 5-10 mm. In this invention, the role of the iron ore slag is to alter the fiber composition, lower the melting point, and improve the strength of the rock wool fibers.

[0062] The rock wool raw material used in this invention comprises 5-10% dolomite, preferably 6-8%, by mass percentage. In this invention, the dolomite comprises SiO2, CaO, and MgO. In this invention, the particle size of the dolomite is preferably 0.5-30 mm, more preferably 1-20 mm, and even more preferably 5-10 mm. In this invention, the dolomite serves to reduce melt viscosity, making the fluid flow more easily and facilitating fiber formation.

[0063] The rock wool raw material used in this invention comprises 4-13% rock wool solid waste, preferably 10%, by weight percentage. In this invention, the source of the rock wool solid waste is preferably scraps from the production of rock wool boards, or waste residue and waste cotton generated during the production process. This invention does not have special requirements for the production method; rock wool waste from the production line of this invention or waste from a conventional rock wool board production line can be used. In this invention, the particle size of the rock wool solid waste is preferably 0.5-30 mm, more preferably 1-20 mm, and even more preferably 5-10 mm.

[0064] This invention involves mixing and melting the rock wool raw materials in an electric furnace to obtain a rock wool slurry. In this invention, the mixing process preferably includes the following steps:

[0065] The rock wool raw material is metered and dried, and then fed into the feed hopper of the electric furnace by vibration mixing.

[0066] This invention uses electrodes in an electric furnace to heat and melt rock wool raw materials. In this invention, the melting temperature in the electric furnace is preferably 1600–1700°C, more preferably 1650°C. This invention does not have special requirements for the melting method in the electric furnace, as long as the rock wool raw materials are completely melted into magma.

[0067] This invention centrifuges and collects the rock wool slurry to obtain rock wool fibers. Preferably, the rock wool slurry is introduced into a centrifuge via a flow channel for centrifugal fiber formation. In this invention, the centrifuge is preferably a four-roller centrifuge. The centrifugation rate is preferably 5800–7600 rpm. This invention does not have special requirements for the collection operation.

[0068] In this invention, the diameter of the rock wool fibers obtained after centrifugation and fiber collection is preferably 4-7 μm, more preferably 5-6 μm.

[0069] Alternatively, the rock wool fiber can be prepared by a cupola combustion method, preferably including the following steps:

[0070] ① Provide rock wool raw materials with the following percentage content:

[0071] Basalt 40-47%, grain size 8-16cm;

[0072] Iron ore slag: 0-14%, particle size: 3-8cm;

[0073] Dolomite 5-11%, with a particle size of 4-8 cm;

[0074] Rock wool solid waste blocks account for 20-30%, and the rock wool solid waste blocks are obtained by pressing rock wool solid waste and silicate cement, with a particle size of 8-16cm.

[0075] Coke content: 13-16%, particle size: 8-16 cm;

[0076] ② The rock wool raw material is sent to a cupola furnace for forced-air combustion to obtain rock wool slurry;

[0077] ③ The rock wool slurry is centrifuged and collected to obtain rock wool fibers.

[0078] In this invention, the rock wool raw material used comprises 40-47% basalt, preferably 42-45%, by mass percentage. The basalt in this invention comprises SiO2, Al2O3, CaO, MgO, Fe2O3, Na2O, K2O, FeO, and TiO2. The basalt particle size in this invention is preferably 8-16 cm, more preferably 10-14 cm.

[0079] The rock wool raw material used in this invention comprises 0-14% iron ore slag, preferably 5-10%, by mass percentage. In this invention, the iron ore slag is preferably sourced from a steel plant, and its main components include SiO2, Al2O3, MgO, CaO, Fe2O3, and TiO2. In this invention, the particle size of the iron ore slag is preferably 3-8 cm, more preferably 5-7 cm. In this invention, the role of the iron ore slag is to alter the fiber composition, lower the melting point, and improve the strength of the rock wool fibers.

[0080] The rock wool raw material used in this invention comprises 5-11% dolomite, preferably 7-10%, by mass percentage. In this invention, the dolomite comprises SiO2, CaO, and MgO. In this invention, the particle size of the dolomite is preferably 4-8 cm, more preferably 5-6 cm. In this invention, the dolomite serves to reduce the melt viscosity, making the fluid flow more easily and facilitating fiber formation.

[0081] The rock wool raw material used in this invention comprises 20-30% rock wool solid waste blocks, preferably 25%, by weight percentage. In this invention, the rock wool solid waste blocks are obtained by pressing rock wool solid waste with silicate cement. The silicate cement in the rock wool solid waste blocks preferably comprises 10-18% by weight, more preferably 15%, and the rock wool solid waste preferably comprises 85% by weight. In this invention, the diameter of the rock wool solid waste blocks is preferably 8-16 cm, more preferably 10-14 cm.

[0082] In this invention, the preferred source of the rock wool solid waste is the scrap material from the production of rock wool boards, or waste residue and waste cotton generated during the production process. This invention does not impose any special requirements on the production method; either the rock wool waste from the production line of this invention or the waste from a conventional rock wool board production line can be used.

[0083] The rock wool raw material used in this invention comprises 13-16% coke, preferably 14-15%, by weight percentage. In this invention, the diameter of the coke is preferably 8-16 cm, more preferably 10-14 cm. In this invention, the coke serves as a combustion aid.

[0084] This invention feeds the rock wool raw material into a cupola furnace for forced-air combustion to obtain rock wool slurry. This invention does not have special requirements for the temperature of the forced-air blast; either cold or hot air can be used. In this invention, during the forced-air blasting process, oxygen is preferably injected into the cupola furnace to promote the partial combustion of the raw material.

[0085] In this invention, the preferred temperature for the forced-air combustion is 1500–1600°C, more preferably 1550°C. This invention does not have specific requirements for the forced-air combustion time; it is sufficient to allow the rock wool raw material to transform into magma.

[0086] This invention involves centrifuging and collecting the rock wool slurry to obtain rock wool fibers. The centrifugation and collection methods are the same as described above and will not be repeated here. In this invention, the diameter of the rock wool fibers obtained after centrifugation and collection is preferably 4–7 μm, more preferably 5–6 μm.

[0087] After obtaining the rock wool fiber, the present invention crushes, combs, and disperses the rock wool fiber. During the crushing process, water, water-repellent agent, and flame retardant are added to obtain rock wool fiber short fibers.

[0088] In this invention, during the crushing process, the amount of water added is preferably 3 to 10% of the rock wool fiber mass, more preferably 4%.

[0089] In this invention, the water-repellent agent is preferably an organosilicon water-repellent agent. As a specific embodiment of this invention, the organosilicon water-repellent agent is manufactured by Shanghai Mufa Industrial Co., Ltd., and its model is C245. In this invention, the mass of the water-repellent agent is preferably 0.3-8% of the rock wool fiber mass, more preferably 0.5-5%, and even more preferably 1-2%. In this invention, the water-repellent agent imparts good waterproof performance to the rock wool fiberboard.

[0090] In this invention, the flame retardant is preferably 1-8% of the rock wool fiber mass, more preferably 2-5%, and even more preferably 3%. In this invention, the flame retardant preferably includes a liquid flame retardant and / or a powdered flame retardant. In this invention, the liquid flame retardant is preferably a phosphate ester flame retardant, and the powdered flame retardant preferably includes one or more of magnesium hydroxide, aluminum hydroxide, and red phosphorus. In this invention, the particle size of the powdered flame retardant is preferably 1-20 μm, more preferably 5-15 μm.

[0091] This invention does not impose any special requirements on the specific pulverization method; any pulverization method well-known to those skilled in the art can be used. In this invention, the length of the rock wool fiber short fibers is preferably 250–4500 μm, more preferably 250–1500 μm.

[0092] After obtaining the rock wool fiber short fibers, the rock wool fiber short fibers are uniformly mixed with an adhesive, evenly laid out, and pre-formed under steam conditions to obtain a pre-formed board. In this invention, the mass of the adhesive is 8-14% of the mass of the rock wool fiber board, preferably 11-12.5%.

[0093] In this invention, the adhesive preferably comprises a water-based adhesive and / or a solid adhesive. In this invention, the water-based adhesive preferably comprises a water-based phenolic resin adhesive or an MDI adhesive. In this invention, the solid content of the water-based adhesive is preferably 40-55%. When using a water-based adhesive, the amount of water-based adhesive used is such that the mass percentage of the adhesive in the rock wool fiberboard is 8-14%.

[0094] In this invention, the solid adhesive is preferably a powdered phenolic resin adhesive. In this invention, the adhesive is commercially available.

[0095] In this invention, the preforming method is preferably compression molding; the present invention preheats the preformed board with steam, which can reduce the temperature difference between the core layer and the surface layer of the preformed board, so as to facilitate the subsequent hot pressing and avoid the situation of incomplete curing of the core layer adhesive, thereby improving the strength of the rock wool fiber board.

[0096] In this invention, the core layer temperature of the preformed plate is preferably 60-110°C, and more preferably 80-100°C.

[0097] After obtaining the preformed board, the present invention performs hot pressing on the preformed board to obtain rock wool fiber board. Preferably, the hot pressing is performed in a hot oil thermal press. In the present invention, the hot pressing temperature is preferably 220–270°C, more preferably 240–260°C; the pressure is preferably 2–7 N / mm². 2 More preferably 4-6 N / mm 2 Further preferably 5N / mm 2 In this invention, the heat-pressing and pressure-holding time is preferably 270–400 s, more preferably 270–380 s. Under these conditions, the hot pressing ensures the adhesive is fully cured, thus improving the strength of the rock wool fiberboard.

[0098] In this invention, the organic content of the rock wool fiberboard is 8-14 wt%, preferably 11-12.5 wt%.

[0099] In this invention, the thickness of the rock wool fiberboard is preferably 3mm to 2.5cm, more preferably 5mm to 2cm, and even more preferably 6mm to 1.5cm. In this invention, the density of the rock wool fiberboard is preferably 150 to 1400 kg / m³. 3 Specifically, the rock wool fiberboard is divided into low-density board, medium-density board, and high-density board, and the density of the low-density board is preferably 150-300 kg / m³. 3 The density of the medium-density fiberboard is preferably >300 kg / m³. 3 And ≤1100kg / m 3 The density of the high-density board is preferably >1100 kg / m³. 3 .

[0100] The rock wool fiberboard provided by this invention has high strength and good fire resistance, water resistance, weather resistance, and breathability. The parameters of the rock wool fiberboard in this invention are as follows:

[0101] ①Static bending strength ≥25MPa;

[0102] ② Elastic modulus ≥ 4000 MPa;

[0103] ③Fire resistance rating: A2, in accordance with standard EN 13501-1;

[0104] ④ Water vapor permeability (23℃, 85% humidity) ≤ 3.5, refer to standard EN 12572;

[0105] ⑤ Coefficient of thermal expansion ≤ 11.5 × 10 -3 mm / m·K, referencing standard EN 438: 2clause 17;

[0106] ⑥ The moisture expansion coefficient (after 4 days) is ≤0.302mm / m, referring to standard EN 438: 2clause 17;

[0107] ⑦ Thermal conductivity ≤ 0.4 mm / m·K, refer to standard EN 10456.

[0108] The primer, intermediate coat, topcoat, and protective varnish used in this invention are all commercially available.

[0109] This invention involves sequentially sanding, roller-coating with a penetrating UV primer, heating, and UV drying of rock wool fiberboard to obtain a rock wool fiberboard coated with a primer layer. In this invention, the sanding material is preferably sandpaper, and the sandpaper is preferably 320 mesh.

[0110] In this invention, the main components of the penetrating UV primer preferably include polyurethane resin, acrylic resin, and epoxy resin, and the mass ratio of polyurethane resin, acrylic resin, and epoxy resin is preferably 2:1:1. As a specific embodiment of this invention, the penetrating UV primer is purchased from Guangzhou Longzhu Chemical Co., Ltd., and its model is UV-438.

[0111] In this invention, the roller coating amount of the penetrating UV primer is preferably 30-100 g / m². 2 More preferably 60g / m 2 In this invention, the heating temperature is preferably 30–80°C, more preferably 50–60°C; the heating time is preferably 2–6 minutes, more preferably 3–4 minutes. During the heating process, the penetrating UV primer undergoes self-leveling and self-penetration.

[0112] In this invention, the ultraviolet drying time is preferably 2 to 4 seconds.

[0113] After obtaining the rock wool fiberboard coated with a primer layer, the present invention roll-coates a filling UV primer onto the surface of the rock wool fiberboard coated with a primer layer, and performs UV curing to obtain a rock wool fiberboard coated with a second primer layer. In the present invention, the main component of the filling UV primer preferably includes epoxy resin, and also includes one of titanium dioxide, putty powder, and gypsum powder. As a specific embodiment of the present invention, the filling UV primer is purchased from Guangzhou Longzhu Chemical Co., Ltd., and the model is UV-5420.

[0114] In this invention, the roller coating amount of the filler UV primer is preferably 20-80 g / m². 2 More preferably 40g / m 2 In this invention, the UV curing time is preferably 2 to 3 seconds.

[0115] After obtaining the rock wool fiberboard coated with two layers of primer, the present invention roll-coates a masking UV primer onto the surface of the rock wool fiberboard coated with two layers of primer, and then performs UV curing to obtain a rock wool fiberboard coated with three layers of primer. In the present invention, the masking UV primer is preferably white in color, and its main components include preferably epoxy resin, and also include one of titanium dioxide, putty powder, and gypsum powder. As a specific embodiment of the present invention, the masking UV primer is purchased from Guangzhou Longzhu Chemical Co., Ltd., and its model number is 5422.

[0116] In this invention, the opaque UV primer is applied in two roller coats. The first roller coat leaves the opaque UV primer semi-dry, and the second roller coat leaves it fully dry. The preferred amount of opaque primer applied per roller coat is 20–80 g / m³. 2 More preferably 40g / m2 .

[0117] In this invention, the UV curing time is preferably 2 to 3 seconds.

[0118] After obtaining the rock wool fiberboard coated with three layers of primer, the present invention performs sanding, roller coating of intermediate paint, and heat curing on the rock wool fiberboard coated with three layers of primer, until the paint surface is semi-dry, thus obtaining a rock wool fiberboard coated with intermediate paint. In the present invention, sanding is preferably performed using sandpaper, and the preferred sandpaper grit size is 320 mesh.

[0119] In this invention, the color of the intermediate coat is preferably the same as or similar to the color of the topcoat. In this invention, the main components of the intermediate coat include epoxy resin and solvent. As a specific embodiment of this invention, the intermediate coat is purchased from Guke Coatings Group Co., Ltd., model K61000; or from Three Trees Coatings Co., Ltd., model SFD100.

[0120] In this invention, the roller coating amount of the intermediate coating is preferably 20-80 g / m². 2 More preferably 30-40 g / m 2 The preferred temperature for heat curing is 45–50°C, and the time is 6–8 minutes. Under these conditions, the paint surface is partially dry, reducing the need for a sanding process. If the paint surface is to be completely dry, an additional sanding process must be added after the intermediate coat, followed by the application of the topcoat and protective varnish.

[0121] After obtaining a rock wool fiberboard coated with a mid-coat, the present invention sprays a topcoat onto the surface of the rock wool fiberboard coated with the mid-coat, and then heats and dries it to obtain a rock wool fiberboard coated with a topcoat. In the present invention, the topcoat preferably includes one or more of a topcoat, an acrylic topcoat, and a weather-resistant polyurethane topcoat, and the spraying amount of the topcoat is preferably 80-180 g / m³. 2 More preferably 100g / m 2 .

[0122] As a specific embodiment of the present invention, the topcoat is purchased from Guke Coatings Group Co., Ltd., model number K60000; or from Three Trees Coatings Co., Ltd., model number SSF200.

[0123] In this invention, the heating and drying is preferably programmed heating and drying, which preferably includes sequential processes:

[0124] Heat at 20–60°C for 15–30 min, more preferably at 30–40°C for 20 min;

[0125] Heating at 40–80°C for 1–2.5 h, more preferably heating at 50–60°C for 1.5 h;

[0126] Heat at 20–60°C for 10–30 min, more preferably at 30–40°C for 20 min.

[0127] After obtaining a rock wool fiberboard coated with a topcoat, the present invention sprays a transparent protective varnish onto the surface of the coated rock wool fiberboard and performs ultraviolet curing to obtain a rock wool fiberboard with a painted surface. In the present invention, the main components of the transparent protective varnish include acrylic resin and methyl methacrylate; as a specific embodiment of the present invention, the transparent protective varnish is purchased from Guke Coatings Group Co., Ltd., model SK01; or from Three Trees Coatings Co., Ltd., model SJM-118F.

[0128] In this invention, the preferred coating amount of the transparent protective varnish is 10–50 g / m². 2 More preferably 30g / m 2 In this invention, the UV curing time is preferably 2 to 3 seconds.

[0129] The present invention provides a rock wool fiberboard with a painted surface obtained by the above method, comprising a rock wool fiberboard and a painted surface coated on the surface of the rock wool fiberboard; the painted surface comprises a penetrating primer layer, a filling UV primer layer, a covering UV primer layer, a mid-coat layer, a topcoat layer and a transparent protective paint layer stacked in sequence.

[0130] The following detailed description, in conjunction with embodiments, illustrates a method for applying paint to a rock wool fiberboard and a rock wool fiberboard coated with paint, but these descriptions should not be construed as limiting the scope of protection of this invention.

[0131] Example 1

[0132] A method for applying paint to rock wool fiberboard, comprising the following steps:

[0133] (1) Sand the rock wool fiberboard sequentially with 240-mesh sandpaper, then roll-coat a penetrating UV primer (manufacturer: Guangzhou Longzhu Chemical Co., Ltd., model: UV-438) at a coating rate of 60 g / m². 2 Heating at 50-60℃ for 3-4 minutes and then UV drying yields a rock wool fiberboard coated with a primer layer.

[0134] (2) A filling UV primer (manufacturer: Guangzhou Longzhu Chemical Co., Ltd., model: UV-5420) was roller-coated onto the surface of the rock wool fiberboard coated with a layer of primer, with a coating amount of 40 g / m². 2 After UV curing for 2-3 seconds, a rock wool fiberboard coated with two layers of primer is obtained.

[0135] (3) Apply a white, opaque UV primer (manufacturer: Guangzhou Longzhu Chemical Co., Ltd., model: 5422) to the surface of the rock wool fiberboard coated with two layers of primer by roller coating. Apply two coats, the first coat being semi-dry and the second coat being fully dry. The amount of each coat is 40 g / m². 2 UV curing is performed to obtain rock wool fiberboard coated with three layers of primer;

[0136] (4) Sand the rock wool fiberboard coated with three layers of primer using 320-mesh sandpaper, then roll-coat a mid-coat (manufacturer: SKSHU Paint Co., Ltd., model: SFD100) with a color similar to the topcoat, at a coating weight of 30g / m². 2 Heat at 45-50℃ for 6 minutes to make the paint surface semi-dry, and obtain rock wool fiberboard coated with intermediate paint.

[0137] (5) Spray fluorocarbon topcoat (manufacturer: Three Trees Coatings Co., Ltd., model: SSF200) onto the surface of the rock wool fiberboard coated with intermediate paint, with a spraying amount of 100g / m². 2 The material is then heated and dried. The drying process involves heating at 30-40℃ for 20 minutes, heating at 50-60℃ for 1.5 hours, and heating at 30-40℃ for 20 minutes to obtain rock wool fiberboard coated with fluorocarbon topcoat.

[0138] (6) A transparent protective varnish (manufacturer: SKSHU Paint Co., Ltd., model: SJM-118F) is sprayed onto the surface of the rock wool fiberboard coated with fluorocarbon topcoat, with a coating amount of 30g / m². 2 After UV curing for 2-3 seconds, a rock wool fiberboard with a painted surface is obtained.

[0139] The resulting painted rock wool fiberboard, used as an outdoor building decorative panel, is shown in the following image. Figure 1 As shown.

[0140] Example 2

[0141] A method for applying paint to rock wool fiberboard, comprising the following steps:

[0142] (1) Sand the rock wool fiberboard sequentially with 240-mesh sandpaper, then roll-coat a penetrating UV primer (manufacturer: Guangzhou Longzhu Chemical Co., Ltd., model: UV-438) at a coating rate of 40 g / m². 2 Heating at 50-60℃ for 3-4 minutes and then UV drying yields a rock wool fiberboard coated with a primer layer.

[0143] (2) A filling UV primer (manufacturer: Guangzhou Longzhu Chemical Co., Ltd., model: UV-5420) was roller-coated onto the surface of the rock wool fiberboard coated with a layer of primer, with a coating amount of 20 g / m².2 After UV curing for 2-3 seconds, a rock wool fiberboard coated with two layers of primer is obtained.

[0144] (3) Apply a white, opaque UV primer (manufacturer: Guangzhou Longzhu Chemical Co., Ltd., model: 5422) to the surface of the rock wool fiberboard coated with two layers of primer by roller coating. Apply two coats, the first coat being semi-dry and the second coat being fully dry. The amount of each coat is 40 g / m². 2 UV curing is performed to obtain rock wool fiberboard coated with three layers of primer;

[0145] (4) Sand the rock wool fiberboard coated with three layers of primer using 320-mesh sandpaper, then roll-coat a mid-coat (manufacturer: SKSHU Paint Co., Ltd., model: SFD100) with a color similar to the topcoat, at a coating weight of 40g / m². 2 Heat at 45-50℃ for 8 minutes to make the paint surface semi-dry, and obtain rock wool fiberboard coated with intermediate paint.

[0146] (5) Spray fluorocarbon topcoat (manufacturer: Three Trees Coatings Co., Ltd., model: SSF200) onto the surface of the rock wool fiberboard coated with intermediate paint, with a spraying amount of 80g / m². 2 The material is then heated and dried. The drying process involves heating at 30-40℃ for 20 minutes, heating at 50-60℃ for 1.5 hours, and heating at 30-40℃ for 20 minutes to obtain rock wool fiberboard coated with fluorocarbon topcoat.

[0147] (6) A transparent protective varnish (manufacturer: SKSHU Paint Co., Ltd., model: SJM-118F) is sprayed onto the surface of the rock wool fiberboard coated with fluorocarbon topcoat, with a coating amount of 10g / m². 2 After UV curing for 2-3 seconds, a rock wool fiberboard with a painted surface is obtained.

[0148] Example 3

[0149] A method for applying paint to rock wool fiberboard, comprising the following steps:

[0150] (1) Sand the rock wool fiberboard sequentially with 240-mesh sandpaper, then roll-coat a penetrating UV primer (manufacturer: Guangzhou Longzhu Chemical Co., Ltd., model: UV-438) at a coating rate of 80 g / m². 2 Heating at 50-60℃ for 3-4 minutes and then UV drying yields a rock wool fiberboard coated with a primer layer.

[0151] (2) A filling UV primer (manufacturer: Guangzhou Longzhu Chemical Co., Ltd., model: UV-5420) was roller-coated onto the surface of the rock wool fiberboard coated with a layer of primer, with a coating amount of 60 g / m². 2After UV curing for 2-3 seconds, a rock wool fiberboard coated with two layers of primer is obtained.

[0152] (3) Apply a white, opaque UV primer (manufacturer: Guangzhou Longzhu Chemical Co., Ltd., model: 5422) to the surface of the rock wool fiberboard coated with two layers of primer by roller coating. Apply two coats, the first coat being semi-dry and the second coat being fully dry. The amount of each coat is 40 g / m². 2 UV curing is performed to obtain rock wool fiberboard coated with three layers of primer;

[0153] (4) Sand the rock wool fiberboard coated with three layers of primer using 320-mesh sandpaper, then roll-coat the intermediate coat (manufacturer: SKSHU Paint Co., Ltd., model: SFD100) with the same color as the topcoat, at a coating weight of 60g / m². 2 Heat at 45-50℃ for 7 minutes to make the paint surface semi-dry, and obtain rock wool fiberboard coated with intermediate paint.

[0154] (5) Spray fluorocarbon topcoat (manufacturer: Three Trees Paint Co., Ltd., model: SSF200) onto the surface of the rock wool fiberboard coated with intermediate paint, with a spraying amount of 140g / m². 2 The material is then heated and dried. The drying process involves heating at 30-40℃ for 20 minutes, heating at 50-60℃ for 1.5 hours, and heating at 30-40℃ for 20 minutes to obtain rock wool fiberboard coated with fluorocarbon topcoat.

[0155] (6) Spray a transparent protective varnish (manufacturer: SKSHU Paint Co., Ltd., model: SJM-118F) onto the surface of the rock wool fiberboard coated with fluorocarbon topcoat, with a coating amount of 50g / m². 2 After UV curing for 2-3 seconds, a rock wool fiberboard with a painted surface is obtained.

[0156] Performance testing

[0157] Weather resistance tests were conducted on the painted rock wool fiberboards obtained in Examples 1-3. The test methods and results are as follows: Figure 2 As shown.

[0158] It can be seen that the rock wool fiberboard with paint coating obtained by the present invention does not blister, peel, crack, chalk, discolor, or lose gloss for 600 hours, and has good weather resistance.

[0159] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for applying paint to rock wool fiberboard, comprising the following steps: (1) The rock wool fiberboard is sanded, coated with a penetrating UV primer, heated and dried under ultraviolet light in sequence to obtain a rock wool fiberboard coated with a layer of primer; the main components of the penetrating UV primer include polyurethane resin, acrylic resin and epoxy resin, and the mass ratio of polyurethane resin, acrylic resin and epoxy resin is 2:1:

1. (2) A filling UV primer is rolled onto the surface of the rock wool fiberboard coated with a layer of primer and then cured with UV to obtain a rock wool fiberboard coated with two layers of primer. (3) A coverable UV primer is rolled onto the surface of the rock wool fiberboard coated with two layers of primer and then cured with UV to obtain a rock wool fiberboard coated with three layers of primer. (4) Sanding, roller coating of intermediate paint and heat curing are performed on the rock wool fiberboard coated with three layers of primer to make the paint surface semi-dry, so as to obtain a rock wool fiberboard coated with intermediate paint. The main components of the intermediate coat include epoxy resin and solvent; the roller coating amount of the intermediate coat is 20~80g / m². 2 The thermosetting temperature is 45~50℃, and the time is 6~8 minutes. (5) A topcoat is sprayed onto the surface of the rock wool fiberboard coated with intermediate paint, and then heated and dried to obtain a rock wool fiberboard coated with topcoat; the topcoat includes one or more of fluorocarbon topcoat, acrylic topcoat, and weather-resistant polyurethane topcoat; the spraying amount of the topcoat is 80~180g / m 2 ; (6) A transparent protective varnish is sprayed onto the surface of the rock wool fiberboard coated with topcoat and then cured under ultraviolet light to obtain a rock wool fiberboard with a painted surface; the main components of the transparent protective varnish include acrylic resin and methyl methacrylate; the spraying amount of the transparent protective varnish is 10~50g / m². 2 ; The method for preparing the rock wool fiberboard includes the following steps: Provide rock wool fiber, wherein the raw materials for preparing the rock wool fiber include basalt, iron ore slag, dolomite, and rock wool solid waste; The rock wool fibers are crushed, combed, and dispersed. Water, water-repellent agent, and flame retardant are added during the crushing process to obtain short rock wool fibers. The rock wool short fibers are uniformly mixed with adhesive, evenly laid out, and pre-formed under steam conditions to obtain a pre-formed board; The preformed board is hot-pressed to obtain rock wool fiber board; The adhesive content in the rock wool fiberboard is 8-14% by mass. The core layer temperature of the preformed plate is 80~110℃.

2. The method according to claim 1, characterized in that, In step (1), the abrasive used for sanding is 240 mesh sand; The roller coating amount of the penetrating UV primer is 30~100g / m². 2 ; The heating temperature is 30~80℃, and the time is 2~6 minutes.

3. The method according to claim 1, characterized in that, In step (2), the main components of the filler UV primer include epoxy resin, and also include one of titanium dioxide, putty powder, and gypsum powder. The roller coating amount of the filler UV primer is 20~80g / m². 2 .

4. The method according to claim 1, characterized in that, In step (3), the opaque UV primer is white in color and its main components include epoxy resin, as well as one of titanium dioxide, putty powder, and gypsum powder.

5. The method according to claim 1 or 4, characterized in that, The opaque UV primer is applied in two roller coats. The first roller coat leaves the opaque UV primer semi-dry, and the second roller coat leaves it fully dry. The single-coat weight of the opaque UV primer is 20~80 g / m². 2 .

6. The method according to claim 1, characterized in that, In step (4), the sanding material used is 320 mesh sand.

7. The method according to claim 1, characterized in that, In step (5), the heating and drying is a programmed heating and drying process, which includes the following steps performed sequentially: Heat at 20~60℃ for 15~30 minutes; Heat at 40~80℃ for 1~2.5 hours; Heat at 20~60℃ for 10~30 minutes.

8. A rock wool fiberboard coated with paint obtained by the method of any one of claims 1 to 7, comprising a rock wool fiberboard and a paint coating on the surface of the rock wool fiberboard; The paint surface consists of a penetrating UV primer layer, a filling UV primer layer, a covering UV primer layer, a mid-coat layer, a topcoat layer, and a transparent protective paint layer, layered sequentially.

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