A method for manufacturing powder sprayed panel furniture

Abstract

The present invention relates to the technical field of panel furniture manufacturing, and in particular to a method for manufacturing powder-sprayed panel furniture. The method for manufacturing powder-sprayed panel furniture comprises the following steps: S1. Coating heat-insulating coating on the four sides and upper and lower surfaces of an artificial board, and forming a first heat-insulating board after UV curing; S2. Attaching aluminum foil facing material to the upper and lower surfaces of the first heat-insulating board to form a second heat-insulating board; S3. Coating heat-insulating coating on the four sides of the second heat-insulating board again to form a third heat-insulating board; S4. Electrostatically spraying powder material on the third heat-insulating board after edge sealing, and obtaining powder-sprayed panel furniture after curing. Since hollow silica microbeads are added to the heat-insulating coating, it can effectively prevent external heat from being transferred to the internal artificial board during the curing process. The heat-insulating coating is applied to the surface of the artificial board to isolate the heat of infrared radiation, and aluminum foil is attached to the surface of the heat-insulating coating to reflect the infrared radiation during curing, so that the artificial board can withstand long-term high-temperature heating.

Description

Technical Field

[0001] The invention relates to the technical field of panel furniture manufacturing, and in particular to a method for manufacturing powder sprayed panel furniture. Background Art

[0002] At present, the commonly used powder coating effects used in artificial boards are sand texture and glossy surface, and the decorative effect is relatively simple. The powder curing temperature after powder spraying is 120-150℃ and the curing time is 3-4min. The existing artificial boards (such as fiberboard or particleboard) can withstand the above processing conditions. However, the boards are easily affected by moisture in a humid environment, and the edges of the boards are still prone to cracking after the high-temperature curing stage of the powder.

[0003] This makes it difficult to promote and apply some special effect powders that require higher curing temperatures or longer curing times on artificial boards, such as metal hammer effect and tortoise crack effect, because artificial boards themselves are heat-sensitive materials, and glue is easily decomposed under high temperature conditions, resulting in a decrease in internal bonding strength. Therefore, artificial boards are difficult to withstand long-term high-temperature heating. However, due to the material composition and formation principle of existing special effect powder materials, it is temporarily impossible to significantly reduce the curing temperature of powder materials or significantly shorten the curing time of powder materials. For example, the powder material with metal hammer effect has a curing condition of 20 minutes at 120-140°C or 10 minutes at 200°C, which cannot be applied to artificial boards or other wood materials. Summary of the invention

[0004] The main purpose of the present invention is to provide a method for manufacturing powder-sprayed panel furniture, aiming to improve the technical problem that existing powder-sprayed panel furniture cannot withstand a long-term high-temperature curing process.

[0005] To achieve the above object, the present invention provides a method for manufacturing powder-sprayed panel furniture, comprising the following steps:

[0006] S1. The thermal insulation coating is applied to the four sides and upper and lower surfaces of the artificial board, and the first thermal insulation board is formed after UV curing;

[0007] S2. Attaching the aluminum foil facing material to the upper and lower surfaces of the first insulation board to form a second insulation board;

[0008] S3. The thermal insulation coating is applied again on the four sides of the second thermal insulation board to form a third thermal insulation board;

[0009] S4. The powder material is electrostatically sprayed on the third insulation board after edge sealing, and after curing, the powder-coated panel furniture is obtained;

[0010] The thermal insulation coating comprises the following raw materials by weight: 50-60 parts of UV resin, 5-10 parts of UV monomer, 5-10 parts of photoinitiator, 2-6 parts of auxiliary agent and 20-35 parts of hollow silica microbeads.

[0011] Preferably, the UV resin includes at least one of bisphenol A epoxy acrylate resin, novolac epoxy acrylate resin, epoxidized oil acrylate resin, polyester acrylate resin, polyurethane acrylate resin and acrylic resin;

[0012] The UV monomer is at least one of pentaerythritol triacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, pentaerythritol tetraacrylate, ethoxylated trimethylolpropane triacrylate, and propoxylated glycerol triacrylate.

[0013] Preferably, the hollow silica microbeads have a particle size of 25-120 μm and a density of 0.15-0.65 g / cm 3 , wall thickness is 1.5-5μm.

[0014] Preferably, in step S1, at least two layers of the thermal insulation coating are sequentially coated on the four sides and the upper and lower surfaces of the artificial board, wherein the particle size of the hollow silica microbeads in the first layer of the thermal insulation coating is 56-120 μm, and the particle size of the hollow silica microbeads in the second layer of the thermal insulation coating is 45-80 μm.

[0015] Preferably, in step S4, the curing process comprises the following steps:

[0016] S41. The third insulation board sealed by electric infrared heating and electrostatic spraying is heated from 40°C to 130°C, and the curing time is 45-90s;

[0017] S42. The third heat insulation board sealed by electrostatic spraying after gas infrared heating is kept warm at 120-130°C for 10-20min;

[0018] S43. The third heat insulation board sealed after electrostatic spraying is heated with hot air and kept warm at 120-130° C. for 10-20 minutes.

[0019] Preferably, the hollow silica microbeads are pretreated as follows before use: the hollow silica microbeads are first added to a hydrofluoric acid solution for acid etching for 1-5 minutes and then dried, and then added to a sodium hydroxide solution for alkaline washing for 10-20 minutes;

[0020] Wherein, the mass concentration of the hydrofluoric acid solution is 1-3%, and the concentration of the sodium hydroxide solution is 1-3 mol / L.

[0021] Preferably, in step S1, the coating amount of the thermal insulation coating is 30-50 g / m 2 The energy of the lamp used for UV curing is UVA 450-600mJ / cm 2 , UVV 1500-1800mJ / cm 2 ;

[0022] In step S3, after the thermal insulation coating is applied again, the total coating thickness of each of the four sides of the second thermal insulation board is 0.2-0.5 mm.

[0023] Preferably, in step S4, the edge-sealed third insulation board is preheated to 70-100° C. before a curing step is performed.

[0024] Preferably, the edge sealing process comprises the following steps: attaching aluminum foil edge sealing strips to the four sides of the third insulation board.

[0025] Preferably, in step S4, the thickness of the powder material after electrostatic spraying is 120-200 μm.

[0026] Compared with the prior art, the powder sprayed panel furniture of the present invention has the following beneficial effects:

[0027] 1. The thermal insulation coating of this scheme is added with hollow silica microbeads. Since hollow silica microbeads have the characteristics of low density, high porosity and low thermal conductivity, after adding them to the thermal insulation coating as fillers, they can effectively prevent the external heat from being transferred to the internal artificial board during the curing process, thereby improving the thermal insulation performance of the coating.

[0028] 2. After the above-mentioned heat-insulating coating is applied on the surface of the artificial board to isolate the heat of infrared radiation, aluminum foil is attached to the surface of the heat-insulating coating to reflect the infrared radiation during curing, so that the artificial board can withstand long-term high-temperature heating, which does not affect the powder on the surface of the artificial board to absorb energy and react to cure, completing the high-temperature curing process after powder spraying, and can keep the temperature inside the artificial board below 100°C as much as possible to prevent the board from cracking, and achieve special decorative effects such as hammer marks and tortoise cracks on the artificial board. Under the best conditions, powder-sprayed panel furniture (artificial board) can be kept warm for 30 minutes at a high temperature of 140°C without cracking, or kept warm for 40 minutes at a high temperature of 130°C without cracking, with excellent heat insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a schematic diagram of the structure of powder-coated panel furniture in Example 1 of the present invention.

[0031] In the attached figure: 1-artificial board, 2-thermal insulation coating, 3-aluminum foil facing material, 4-aluminum foil edge banding strip.

[0032] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The present invention provides a method for manufacturing powder spray-coated panel furniture, comprising the following steps:

[0036] S1. The thermal insulation coating is applied to the four sides and upper and lower surfaces of the artificial board 1, and the first thermal insulation board is formed after UV curing;

[0037] S2. The aluminum foil facing material 3 is attached to the upper and lower surfaces of the first insulation board to form a second insulation board;

[0038] S3. The thermal insulation coating is applied again on the four sides of the second thermal insulation board to form a third thermal insulation board;

[0039] S4. The powder material is electrostatically sprayed on the third insulation board after edge sealing, and after curing, the powder-coated panel furniture is obtained;

[0040] The heat-insulating coating comprises the following raw materials by weight: 50-60 parts of UV resin, 5-10 parts of UV monomer, 5-10 parts of photoinitiator, 2-6 parts of auxiliary agent and 20-35 parts of hollow silica microbeads.

[0041] The heat-insulating coating of this solution can be applied to various fields requiring heat insulation, and is particularly suitable for use in the field of powder-coated panel furniture.

[0042] By pre-treating the surface of the board, specifically coating the surface of the artificial board 1 with the above-mentioned heat-insulating coating to isolate the heat of infrared radiation, and attaching aluminum foil on the surface of the heat-insulating coating to reflect the infrared radiation during curing, the artificial board 1 can withstand long-term high-temperature heating, which does not affect the powder on the surface of the artificial board 1 to absorb energy and react to cure, completing the high-temperature curing process after powder spraying; and can keep the temperature inside the artificial board 1 below 100°C as much as possible to prevent the board from cracking, and achieve special decorative effects such as hammer marks and tortoise cracks on the artificial board 1. In actual production, the artificial board 1 that has undergone the above-mentioned pretreatment can be heated for 30 minutes at a temperature of 120°C or even higher without cracking or bursting.

[0043] The specific steps of the powder spraying panel furniture manufacturing method are as follows: ① Rolling heat-insulating coating: Rolling heat-insulating coating on the surface of artificial board 1, and then irradiating with ultraviolet light after rolling, so that the heat-insulating coating on the surface of artificial board 1 is cured to form heat-insulating coating 2. This process mainly uses heat-insulating coating to reduce the heat transferred from the surface to the inner board, which can reduce the heat transfer by about 30-50%. Among them, artificial board 1 can be fiberboard or particleboard, preferably Sanwei high-density fiberboard or Fenglin E0 particleboard.

[0044] ② Aluminum foil: The aluminum foil facing material 3 is horizontally pasted on the artificial board 1 coated with heat insulation paint by a roller through glue to form a second heat insulation board. The thickness of the aluminum foil is 0.07-0.35mm, and the glue can be (Fule 9818VF high temperature resistant) PUR glue, and the glue coating amount is 50-80g / m 2 , melt temperature 130-150℃, feed speed 3-4m / min. The main purpose of this process is to use aluminum foil to reflect infrared radiation during the curing process, greatly reducing the conduction of infrared radiation heat to the inside of the plate, and the radiation reflectivity is about 60%-90%.

[0045] ③ Cutting: The artificial board 1 in the above step ① can be a large-sized board, on which the heat-insulating coating is coated and then the aluminum foil facing material 3 is flatly attached, and then the large-sized artificial board 1 is cut into small boards of required sizes. Of course, the artificial board 1 can also be cut into the required size first, then coated with the heat-insulating coating, and then the aluminum foil facing material 3 is flatly attached.

[0046] ④ Roll edge: Use the thermal insulation coating to roll the edge of the second thermal insulation board to obtain the third thermal insulation board. The thermal insulation coating used in this process is consistent with the ratio in process ①. It is best to control the viscosity of the thermal insulation coating at 40000-60000mPa.s (25℃) to ensure the uniformity of the thickness of the thermal insulation coating 2 after coating.

[0047] ⑤ Edge sealing: Use high temperature resistant PUR glue and aluminum foil edge sealing strip 4 to seal the third insulation board. Do not use pre-milling cutter in this process to avoid damaging the insulation coating 2. The glue coating amount is 120-220g / m 2 After edge sealing, cure for 48 hours to allow the glue to fully react and cross-link.

[0048] ⑥Electrostatic powder spraying: first spray the powder. Taking metal hammer powder as an example, the powder thickness needs to be guaranteed to be 120-200μm to achieve the desired effect. Then perform high-temperature curing and control the heating speed according to the required hammer texture size. After curing, powder-coated panel furniture is obtained.

[0049] In this solution, the thermal insulation coating is composed of the basic components of UV resin and UV monomer, and a photoinitiator is also added to transfer the energy of ultraviolet photons, quickly initiate the cross-linking polymerization of monomers and oligomers, and promote the liquid-solid conversion process of the system. Different from the existing UV coating, the thermal insulation coating of this solution is added with hollow silica microbeads. Since hollow silica microbeads have the characteristics of low density, high porosity and low thermal conductivity, after adding them as fillers to the thermal insulation coating, it can effectively prevent the external heat from being transferred to the internal artificial board 1 during the curing process, thereby improving the thermal insulation performance of the coating.

[0050] Commonly used additives in thermal insulation coatings include leveling agents, dispersants and defoamers, etc. For example, in actual production, polyacrylate leveling agents with a relative molecular mass of 6000-20000 can be used, and the addition amount is 1-2 parts; unsaturated carboxylic acid dispersants can be used, and the addition amount is 1-2 parts; polysiloxane-polyether defoamers can be used, and the addition amount is 1-2 parts.

[0051] Further, the UV resin includes at least one of bisphenol A epoxy acrylate resin, phenolic epoxy acrylate resin, epoxidized oil acrylate resin, polyester acrylate resin, polyurethane acrylate resin and acrylate resin; the UV monomer is at least one of pentaerythritol triacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, pentaerythritol tetraacrylate, ethoxylated trimethylolpropane triacrylate and propoxylated glycerol triacrylate.

[0052] Furthermore, the hollow silica microbeads have a particle size of 25-120 μm and a density of 0.15-0.65 g / cm3 , the wall thickness is 1.5-5 μm. When the parameters of the hollow silica microspheres are controlled within the above range, the thermal conductivity is 0.12-0.33 W / m·K, which can make the thermal insulation coating have excellent thermal insulation performance.

[0053] Furthermore, in step S1, at least two layers of the thermal insulation coating are sequentially coated on the four sides and the upper and lower surfaces of the artificial board 1, wherein the particle size of the hollow silica microbeads in the first layer of the thermal insulation coating is 56-120 μm, and the particle size of the hollow silica microbeads in the second layer of the thermal insulation coating is 45-80 μm.

[0054] In this embodiment, two layers of different thermal insulation coatings are sequentially coated on the surface of the artificial board 1. Specifically, the hollow silica microbeads in the thermal insulation coatings have different particle sizes, so that there is a certain difference in thermal conductivity between the two layers of thermal insulation coatings 2, which can further improve the thermal insulation effect. Among them, the second layer of thermal insulation coating is located on the outer layer.

[0055] Further, in step S4, the curing process includes the following steps: S41. Using electric infrared to heat the third insulation board that is sealed after electrostatic spraying, the temperature is raised from 40°C to 130°C, and the curing time is 45-90s; S42. Using gas infrared to heat the third insulation board that is sealed after electrostatic spraying, and keep it warm at 120~130°C for 10-20min; S43. Using hot air to heat the third insulation board that is sealed after electrostatic spraying, and keep it warm at 120~130°C for 10-20min.

[0056] After the powder material is electrostatically sprayed on the existing artificial board 1, it is usually cured by heating from room temperature to 120°C / 130°C by infrared radiation (such as electric infrared heating).

[0057] The preferred curing process of this scheme is specifically the steps in Table 1 below, which can further avoid cracking of the internal board. The first stage is the rapid melting stage, during which electric infrared heating is mainly performed using infrared radiation heaters and other equipment. The powder material melts rapidly during the heating process of 40-130°C. At 40-60°C, as the temperature rises, the surface of the powder coating particles begins to melt and aggregate with each other; in the temperature range of 80-100°C, the powder coating particles continue to melt and spread and level on the surface of the artificial board 1; in the temperature range of 100-130°C, the powder begins to solidify at high temperature. The second stage is the heat preservation reaction stage, at this time, the gas infrared heating method is replaced, specifically, natural gas catalyst catalytic heating infrared radiation heating (the catalyst can be a Pt-based or Pd-based catalyst). In this stage, the powder coating continues to solidify, and the viscosity of the system begins to gradually increase, forming the required special decorative effects (such as hammer marks, tortoise cracks, etc.). The third stage uses hot air heating, and continues to keep warm for 10-20 minutes at 120-130°C to deepen the hammer or crack texture on the surface of the artificial board 1, thereby obtaining the final powder-sprayed panel furniture.

[0058] Table 1 Curing process of powder-coated panel furniture

[0059]

[0060] Furthermore, the hollow silica microbeads are pretreated as follows before use: the hollow silica microbeads are first added to a hydrofluoric acid solution for acid etching for 1-5 minutes and then dried, and then added to a sodium hydroxide solution for alkaline washing for 10-20 minutes; wherein the mass concentration of the hydrofluoric acid solution is 1-3%, and the concentration of the sodium hydroxide solution is 1-3 mol / L.

[0061] After the above process, the hollow silica microbeads are corroded by acid and alkali to form uneven small grooves on the surface, which increases the roughness of the hollow silica microbeads. In the thermal insulation coating, they can be more tightly combined with other raw materials such as resin components. The polymer chain segments of the resin matrix can enter the small grooves on the surface of the hollow silica microbeads, increasing the interaction force between the interfaces of the two, thereby improving the uniformity of the thermal insulation coating on the surface of the artificial board 1. During the curing process, the surface of the artificial board 1 can be completely covered with a uniform thermal insulation coating 2, avoiding uneven thickness in certain areas, having a better thermal insulation effect, and further avoiding cracking of the internal board.

[0062] Furthermore, in step S1, the coating amount of the thermal insulation coating is 30-50 g / m 2 The energy of the lamp used for UV curing is UVA 450-600mJ / cm 2 , UVV 1500-1800mJ / cm 2In step S3, after the thermal insulation coating is applied again, the total coating thickness of each of the four sides of the second thermal insulation board is 0.2-0.5 mm. When the thermal insulation coating is rolled according to the above parameters, the thermal insulation coating on the surface of the artificial board 1 can be ensured to have a good thermal insulation effect.

[0063] Furthermore, in step S4, the third insulation board after edge sealing is preheated to 70-100°C before the curing step. Before curing, the third insulation board is preheated, specifically to 70-100°C, to reduce the temperature difference between the electrostatic spray coating and the third insulation board, which is beneficial to improve the bonding strength between the powder material and the third insulation board.

[0064] Preferably, the edge sealing process includes the following steps: the four sides of the third heat insulation board are attached with aluminum foil edge sealing strips 4. The function of the edge sealing process is: on the one hand, it can ensure the tensile strength of the edge of the third heat insulation board so that the board does not burst; on the other hand, it also has a certain heat insulation effect and can reflect infrared radiation. Usually, the aluminum foil edge sealing strip 4 is composed of aluminum foil with a thickness of 0.07-0.2mm and a paper edge sealing strip with a thickness of 0.3-0.5mm, and the aluminum foil layer is located on the outer layer.

[0065] Furthermore, in step S4, the thickness of the powder material after electrostatic spraying is 120-200 μm.

[0066] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to explain the present invention, and are not used to limit the present invention.

[0067] Comparative Example 1

[0068] The powder material is directly electrostatically sprayed on the artificial board 1, and the curing conditions are: using electric infrared heating, the temperature is raised from 40°C to 130°C within 60s, and the temperature is kept at 130°C for 20min.

[0069] Example 1

[0070] A method for manufacturing powder spray-coated panel furniture comprises the following steps:

[0071] S1. A layer of heat-insulating coating is applied on the four sides and upper and lower surfaces of the artificial board 1, and a first heat-insulating board is formed after UV curing;

[0072] S2. The aluminum foil facing material 3 is attached to the upper and lower surfaces of the first insulation board to form a second insulation board;

[0073] S3. Apply the insulation coating again on the four sides of the second insulation board to form a third insulation board;

[0074] S4. Electrostatically spraying the powder material onto the third insulation board after edge sealing, and after curing, obtaining the powder-sprayed panel furniture.

[0075] The curing conditions were the same as those in Comparative Example 1, i.e., the temperature was raised from 40° C. to 130° C. within 60 seconds, and the temperature was kept at 130° C. for 20 minutes.

[0076] The thermal insulation coating includes the following raw materials in parts by weight: 60 parts of UV resin, 8 parts of UV monomer, 6 parts of photoinitiator, 1 part of leveling agent, 1 part of dispersant, 2 parts of defoaming agent and 22 parts of hollow silica microbeads.

[0077] Example 2

[0078] A method for manufacturing powder spray-coated panel furniture comprises the following steps:

[0079] S1. A layer of heat-insulating coating is applied on the four sides and upper and lower surfaces of the artificial board 1, and a first heat-insulating board is formed after UV curing;

[0080] S2. The aluminum foil facing material 3 is attached to the upper and lower surfaces of the first insulation board to form a second insulation board;

[0081] S3. Apply the insulation coating again on the four sides of the second insulation board to form a third insulation board;

[0082] S4. Electrostatically spray the powder material onto the third heat insulation board after edge sealing, and after curing, obtain the powder sprayed board furniture. The curing conditions are the same as those in Comparative Example 1, that is, the temperature is increased from 40°C to 130°C within 60s, and the temperature is kept at 130°C for 20min.

[0083] The thermal insulation coating includes the following raw materials in parts by weight: 52 parts of UV resin, 5 parts of UV monomer, 8 parts of photoinitiator, 2 parts of leveling agent, 2 parts of dispersant, 1 part of defoaming agent and 30 parts of hollow silica microbeads.

[0084] Example 3

[0085] A method for manufacturing powder spray-coated panel furniture comprises the following steps:

[0086] S1. A layer of heat-insulating coating is applied on the four sides and upper and lower surfaces of the artificial board 1, and a first heat-insulating board is formed after UV curing;

[0087] S2. The aluminum foil facing material 3 is attached to the upper and lower surfaces of the first insulation board to form a second insulation board;

[0088] S3. Apply the insulation coating again on the four sides of the second insulation board to form a third insulation board;

[0089] S4. Electrostatically spray the powder material onto the third heat insulation board after edge sealing, and after curing, obtain the powder sprayed board furniture. The curing conditions are the same as those in Comparative Example 1, that is, the temperature is increased from 40°C to 130°C within 60s, and the temperature is kept at 130°C for 20min.

[0090] The thermal insulation coating includes the following raw materials by weight: 55 parts of UV resin, 10 parts of UV monomer, 10 parts of photoinitiator, 2 parts of leveling agent, 1 part of dispersant, 2 parts of defoaming agent and 20 parts of hollow silica microbeads.

[0091] Comparative Example 2

[0092] The preparation steps and parameters in this comparative example are the same as those in Example 1, except that hollow silica microbeads are not added to the raw materials of the thermal insulation coating.

[0093] The powder-sprayed panel furniture prepared in Examples 1-3 and Comparative Examples 1-2 were subjected to the following performance tests, and the specific test results are shown in Table 2 below.

[0094] Table 2 Performance test results of powder sprayed panel furniture examples 1-3 and comparative examples 1-2 of the present invention

[0095]

[0096] Note: 100 powder-sprayed panel furniture products were prepared using the preparation steps of the above embodiment and comparative example, and the surface and edges of the finished powder-sprayed panel furniture were observed to see if cracks appeared, and the total number of products with cracks was recorded. Among them, the cracking rate at the end of production = (the number of powder-sprayed panel furniture with cracks / the total number of powder-sprayed panel furniture) × 100%, and the cracking rate after 6 months of use = (the number of powder-sprayed panel furniture with cracks / the total number of powder-sprayed panel furniture without cracks after production) × 100%.

[0097] It can be seen from the test results of comparative example 1 in Table 2 above that after directly spraying powder on the artificial board 1 and then performing long-term high-temperature curing, the artificial board 1 cannot withstand the long-term high-temperature heating environment, so all cracks appear.

[0098] By observing the powder-coated panel furniture obtained in Examples 1-3 of the present scheme, the cracking phenomenon is greatly reduced. Specifically, the cracking rate of the powder-coated panel furniture just produced can be controlled below 15%. At the same time, in order to verify whether micro-cracks that are difficult to observe with the naked eye appear inside the artificial board 1, the micro-cracks will gradually expand to form cracks visible to the naked eye under the influence of water vapor, temperature changes and other conditions during subsequent use. Therefore, the present scheme also conducted statistics on the powder-coated panel furniture after being placed under natural conditions for 6 months. According to the recorded data, even after a long period of use, the cracking rate of the powder-coated panel furniture of the present scheme can be basically controlled below 13%, and the wood-based artificial board can withstand long-term high-temperature curing conditions.

[0099] It can be seen from the test results of Comparative Example 2 that the hollow silica microbeads in the thermal insulation coating play a major role in blocking heat transfer to the inside. When there are no evenly distributed hollow silica microbeads in the coating, the thermal insulation effect of the artificial board is reduced.

[0100] Example 4

[0101] The preparation steps and parameters in this embodiment are the same as those in Embodiment 1, except that in step S1, several layers of different thermal insulation coatings are successively coated on the surface of the artificial board 1 (the total coating thickness is consistent with that in Embodiment 1), as shown in Table 3 below.

[0102] Table 3 Adjustment of thermal insulation coating of powder sprayed panel furniture in Example 4

[0103]

[0104] The powder-sprayed panel furniture prepared in Example 4 was subjected to performance testing, and the specific test results are shown in Table 4 below.

[0105] Table 4 Performance test results of Example 4 of powder-coated panel furniture of the present invention

[0106]

[0107] As shown in the test data of Table 4 above, after applying 2 or 3 layers of thermal insulation coating with different particle sizes of hollow silica microbeads on the artificial board 1 in sequence, the thermal insulation effect of the thermal insulation coating 2 can be further improved, thereby reducing the cracking of powder-sprayed panel furniture. The cracking rate of powder-sprayed panel furniture just produced can be controlled below 10%, and the cracking rate of powder-sprayed panel furniture after 6 months of storage can be controlled below 7%.

[0108] Example 5

[0109] The preparation steps and parameters in this embodiment are the same as those in Embodiment 4-2, except that the curing step is different, as shown in Table 5 below.

[0110] Table 5 Adjustment of curing steps for powder-coated panel furniture in Example 5

[0111]

[0112] Comparative Example 3

[0113] The preparation steps and parameters in this comparative example are the same as those in Example 5, except that hot air heating is used in both the heat preservation reaction and the texture formation stages.

[0114] Comparative Example 4

[0115] The preparation steps and parameters in this comparative example are the same as those in Example 5, except that infrared heating is used in both the heat preservation reaction and the texture formation stages.

[0116] Comparative Example 5

[0117] The preparation steps and parameters in this comparative example are the same as those in Example 1, except that the curing step is different, as shown in Table 6 below.

[0118] Table 6 Specific curing steps of powder sprayed panel furniture in Comparative Example 5

[0119]

[0120] The powder spray-coated panel furniture prepared in Example 5 and Comparative Examples 3-5 were subjected to performance testing, and the specific test results are shown in Table 7 below.

[0121] Table 7 Performance test results of powder spray-coated panel furniture Example 5 and Comparative Examples 3-5 of the present invention

[0122]

[0123] As shown in the test data of Table 7, since the insulation time is extended in Example 5, the powder coating sprayed on the surface of the powder-sprayed board furniture has a better cracking effect and a better decorative effect during a longer insulation time. However, since the artificial board 1 is continuously insulated at a high temperature of 130°C for 40 minutes, the cracking rate of the artificial board 1 in the powder-sprayed board furniture increases.

[0124] However, due to the special powder spraying panel furniture manufacturing method of this scheme, two layers of heat-insulating coatings with different hollow silica microbead particle sizes are sequentially coated on the artificial board 1. Even if the artificial board 1 is continuously heated for 40 minutes under high temperature conditions, the cracking rate of the powder spraying panel furniture after production can be controlled below 10%, and the cracking rate of the powder spraying panel furniture after being placed under natural conditions for 6 months can also be controlled below 9%. Moreover, after repeated experiments, it was found that when the powder spraying panel furniture of Example 5 was only kept warm for about 30 minutes under high temperature conditions of 130°C, the whole batch of powder spraying panel furniture after production could basically not crack, and the cracking rate of the powder spraying panel furniture after being placed for 6 months could also be controlled below 3%. It not only has a good hammer pattern decorative effect, but also can ensure good product quality, and the powder spraying panel furniture will not crack easily.

[0125] It can be seen from the test results of Comparative Examples 3 and 4 that the heating method in the curing process of this scheme is also very important. It is first heated to 130 degrees Celsius by electric infrared, and then kept warm under gas infrared heating conditions and hot air conditions in turn. Only in this way can the powder-coated panel furniture obtained have both good texture decorative effects and relatively low cracking rate.

[0126] It can be seen from the test results of Comparative Example 5 that when only a single layer of thermal insulation coating is coated on the surface of the artificial board 1, the thermal insulation effect is not as good as the double layer of thermal insulation coating in Example 5 (the particle sizes of the two layers of hollow silica microbeads are different). Since the artificial board 1 of Comparative Example 5 has been subjected to high-temperature heating for up to 40 minutes, the cracking rate of the powder-coated panel furniture is increased to 19%. After a period of use, the powder-coated panel furniture also has more cracks.

[0127] Example 6

[0128] The preparation steps and parameters in this embodiment are the same as those in Embodiment 1, except that the hollow silica microbeads are pretreated as follows: the hollow silica microbeads are first etched in a 2.5 mol / L hydrofluoric acid solution for 5 min and then dried, and then alkali washed in a 1% sodium hydroxide solution for 13 min.

[0129] The powder-sprayed panel furniture prepared in Example 6 was subjected to performance testing, and the specific test results are shown in Table 8 below.

[0130] Table 8 Performance test results of powder spray-coated panel furniture embodiment 6 of the present invention

[0131]

[0132] As shown in the test data of Table 8 above, after the above pretreatment, the surface roughness of the hollow silica microbeads is increased, and they are more closely combined with the other raw material components in the thermal insulation coating, so that the thermal insulation coating is more evenly distributed on the surface of the artificial board 1, ensuring that the thermal insulation coating 2 in each area of ​​the artificial board 1 has a good thermal insulation effect, reducing the cracking of powder-coated panel furniture. The cracking rate of powder-coated panel furniture that has just been produced can be controlled at about 10%, and the cracking rate of powder-coated panel furniture that has been placed for 6 months can be controlled at about 7-9%.

[0133] Example 7

[0134] A method for manufacturing powder spray-coated panel furniture comprises the following steps:

[0135] S1. Apply three layers of heat-insulating coating on the four sides and upper and lower surfaces of the artificial board 1 in sequence (the particle size of the hollow silica microbeads in the first layer is 80-110 μm, the particle size of the hollow silica microbeads in the second layer is 65-90 μm, and the particle size of the hollow silica microbeads in the third layer is 50-65 μm), and form a first heat-insulating board after UV curing;

[0136] The thermal insulation coating includes the following raw materials by weight: 52 parts of UV resin, 5 parts of UV monomer, 8 parts of photoinitiator, 2 parts of leveling agent, 2 parts of dispersant, 1 part of defoamer and 30 parts of hollow silica microbeads; the hollow silica microbeads in the thermal insulation coating are pretreated as follows: the hollow silica microbeads are first added to a hydrofluoric acid solution with a concentration of 2 mol / L for acid etching for 4 minutes and then dried, and then added to a sodium hydroxide solution with a mass concentration of 2% for alkaline washing for 16 minutes;

[0137] S2. The aluminum foil facing material 3 is attached to the upper and lower surfaces of the first insulation board to form a second insulation board;

[0138] S3. The thermal insulation coating is applied again on the four sides of the second thermal insulation board to form a third thermal insulation board;

[0139] S4. Electrostatically spraying the powder material onto the third insulation board after edge sealing, and after curing, obtaining the powder-sprayed panel furniture.

[0140] The curing conditions are shown in Table 9 below.

[0141] Table 9 Specific curing steps for powder-coated panel furniture in Example 7

[0142]

[0143] The powder-sprayed panel furniture prepared in Example 7 was subjected to performance testing, and the specific test results are shown in Table 10 below.

[0144] Table 10 Performance test results of powder spray-coated panel furniture embodiment 7 of the present invention

[0145]

[0146] It can be seen from the test results in Table 10 above that by comprehensively adjusting the raw material ratio of the thermal insulation coating, the number of thermal insulation coating layers coated on the surface of the artificial board 1 (the particle size of the hollow silica microbeads in each layer is different), the pretreatment process of the hollow silica microbeads, and the curing steps, the powder-coated panel furniture prepared will basically not crack after being kept warm at 130°C for 40 minutes, and the artificial board 1 will rarely crack after being used for a long period of time.

[0147] It was found through experiments that the curing conditions of the powder-coated panel furniture of Example 7 were adjusted to a high temperature of 140°C for 30 minutes, and the powder-coated panel furniture just produced would not crack. Moreover, after being placed for 6 months, the cracking rate of the artificial board 1 was also below 3%, which has an excellent heat-insulating effect.

[0148] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for manufacturing powder sprayed panel furniture, characterized in that: The steps include: S1. Applying a heat-insulating coating on the four sides and upper and lower surfaces of the artificial board (1), and curing it with ultraviolet light to form a first heat-insulating board; S2. Attaching the aluminum foil facing material (3) to the upper and lower surfaces of the first insulation board to form a second insulation board; S3. The thermal insulation coating is applied again on the four sides of the second thermal insulation board to form a third thermal insulation board; S4. The powder material is electrostatically sprayed on the third insulation board after edge sealing, and after curing, the powder-coated panel furniture is obtained; The thermal insulation coating comprises the following raw materials by weight: 50-60 parts of UV resin, 5-10 parts of UV monomer, 5-10 parts of photoinitiator, 2-6 parts of auxiliary agent and 20-35 parts of hollow silica microbeads; In step S1, at least two layers of the thermal insulation coating are sequentially applied to the four sides and the upper and lower surfaces of the artificial board (1), wherein the particle size of the hollow silica microbeads in the first layer of the thermal insulation coating is 56-120 μm, and the particle size of the hollow silica microbeads in the second layer of the thermal insulation coating is 45-80 μm; In step S4, the curing process includes the following steps: S41. The third insulation board sealed by electric infrared heating and electrostatic spraying is heated from 40°C to 130°C, and the curing time is 45-90s; S42. The third heat insulation board sealed by gas infrared heating and electrostatic spraying is kept warm at 120-130°C for 10-20min; S43. The third heat insulation board sealed after electrostatic spraying is heated with hot air and kept warm at 120-130° C. for 10-20 minutes.

2. A method for manufacturing powder-sprayed panel furniture according to claim 1, characterized in that: The UV resin includes at least one of bisphenol A epoxy acrylate resin, novolac epoxy acrylate resin, epoxidized oil acrylate resin, polyester acrylate resin, and polyurethane acrylate resin; The UV monomer is at least one of pentaerythritol triacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, pentaerythritol tetraacrylate, ethoxylated trimethylolpropane triacrylate, and propoxylated glycerol triacrylate.

3. The method for manufacturing powder-sprayed panel furniture according to claim 1, characterized in that: The density of the hollow silica microbeads is 0.15-0.65 g / cm 3 , wall thickness is 1.5-5μm.

4. The method for manufacturing powder-sprayed panel furniture according to claim 1, characterized in that: The hollow silica microbeads are pretreated as follows before use: the hollow silica microbeads are first added to a hydrofluoric acid solution for acid etching for 1-5 minutes and then dried, and then added to a sodium hydroxide solution for alkaline washing for 10-20 minutes; Wherein, the mass concentration of the hydrofluoric acid solution is 1-3%, and the concentration of the sodium hydroxide solution is 1-3 mol / L.

5. The method for manufacturing powder-sprayed panel furniture according to claim 1, characterized in that: In step S1, the coating amount of the thermal insulation coating is 30-50 g / m 2 The energy of the lamp used for UV curing is UVA 450-600mJ / cm 2 , UVV 1500-1800mJ / cm 2 ; In step S3, after the thermal insulation coating is applied again, the total coating thickness of each of the four sides of the second thermal insulation board is 0.2-0.5 mm.

6. The method for manufacturing powder-sprayed panel furniture according to claim 1, characterized in that: In step S4, the edge-sealed third heat insulation board is preheated to 70-100° C. and then a curing step is performed.

7. The method for manufacturing powder-sprayed panel furniture according to claim 1, characterized in that: In step S4, the edge sealing process includes the following steps: attaching aluminum foil edge sealing strips (4) to the four sides of the third insulation board.

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