Decorative cover and manufacturing process thereof
By coating the surface of a polypropylene substrate with adhesive, special ink, and colored ink, and then laminating it with a film, the problem of poor ink adhesion in polypropylene decorative covers was solved, thus improving the aesthetics and performance of the decorative covers.
Patent Information
- Application Number
- CN202511585594.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-02-24
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the prior art, when polypropylene material is used for the decorative cover of a washing machine, the ink adhesion is poor, making it difficult to meet the aesthetic requirements, and the corrosion resistance is generally poor.
The decorative cover is prepared by coating a polypropylene substrate with adhesive, followed by coating a special ink and a color ink, and then laminating a film on it. The decorative cover is then prepared by thermoforming and in-mold injection molding. The special ink and film are used to improve adhesion, and the performance is enhanced by combining IMD technology.
It improves the aesthetics and performance of the decorative cover, especially the ink adhesion, meeting the requirements for high aesthetics and functionality.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] This invention belongs to the field of washing machine manufacturing and assembly technology, specifically relating to a decorative cover and its manufacturing process. Background Technology
[0002] Washing machines are common household appliances that use electrical energy to generate mechanical action to wash clothes. The decorative cover is an important component of the washing machine, and it has high requirements in both function and appearance.
[0003] The decorative cover is in prolonged contact with detergent and is exposed to the damp environment of a bathroom or direct sunlight on a balcony. Therefore, the mechanical properties, corrosion resistance, and aging resistance of the decorative cover are crucial and directly affect the lifespan of the washing machine. Furthermore, as people's living standards improve, their aesthetic demands for the decorative cover are also increasing.
[0004] Polypropylene (PP) is a commonly used material for washing machine decorative covers. It is low in cost, possesses excellent impact resistance, corrosion resistance, and good processability, and also has good insulation properties, meeting the electrical safety requirements of washing machines. Ink printing is a common method to improve aesthetics; however, polypropylene is characterized by low polarity, high crystallinity, and low surface energy, resulting in poor ink adhesion, making it difficult to meet the aesthetic improvement requirements of polypropylene.
[0005] Patent application CN109130062A discloses an improved injection molding process for washing machine lids, comprising the following steps: (1) raw material mixing; (2) stirring; (3) raw material pretreatment; (4) equipment pretreatment; (5) raw material plasticization; (6) mold closing; (7) raw material injection; (8) pressure holding; (9) cooling and molding; (10) mold opening; (11) removal of the molded shell; (12) mold cleaning; (13) inspection; (14) finished product warehousing; (15) crushing; (16) screening. This patent application adopts high-gloss, traceless injection molding without spraying, which avoids the problem of poor ink adhesion on the polypropylene surface, but the gloss of the washing machine lid is still generally poor, which is difficult to meet people's high aesthetic requirements. In addition, the functional indicators such as corrosion resistance of the washing machine lid are also generally poor. Summary of the Invention
[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a decorative cover and its manufacturing process, which has excellent performance and good aesthetics.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A manufacturing process for a decorative cover includes the following steps:
[0009] (1) First, apply glue evenly to the surface of polypropylene substrate I to form an glue layer;
[0010] (2) Next, a special ink is evenly coated on the surface of the adhesive layer to form the first ink layer;
[0011] (3) Then, uniformly coat the surface of the first ink layer with colored ink to form the second ink layer;
[0012] (4) Finally, a film is laminated on the surface of the second ink layer, hot-pressed, punched, the printed surface of the film is wiped with alcohol, and in-mold injection molding is performed to obtain the decorative cover.
[0013] The special ink is made by mixing the following components in parts by weight: 10 parts water-based acrylic resin, 1.2-1.5 parts microcrystalline wax, 0.2-0.3 parts N,N-dimethylaniline, 0.2-0.3 parts polystyrene nanospheres, 0.3-0.4 parts azobisisobutyronitrile, 5-6 parts pigment, 0.3-0.5 parts triethylamine, 0.8-1 part surfactant, 0.3-0.5 parts dispersant, 0.2-0.3 parts 1-butyl-3-methylimidazolium tetrafluoroborate, and 0.1-0.2 parts N-octyl-4-methylpyridine tetrafluoroborate;
[0014] The diaphragm is obtained by sequentially laminating IMD special adhesive, base ink, polyvinyl chloride sheet, adhesive, polypropylene substrate III, and skin-feel coating onto the surface of polypropylene substrate II.
[0015] Preferably, the polypropylene substrate I, polypropylene substrate II, or polypropylene substrate III, by weight, is prepared by the following method: First, 10 parts of polypropylene masterbatch are heated to 160-170°C, then 0.1-0.2 parts of antimony trioxide and 0.9-1.1 parts of styrene-butadiene rubber are added, and the mixture is kept warm and stirred for 20-30 minutes; then 0.3-0.4 parts of light calcium carbonate, 0.7-0.9 parts of phosphite, 0.3-0.4 parts of nano zinc oxide, and 0.3-0.4 parts of phthalate are added, and the mixture is kept warm and stirred for 20-30 minutes to obtain a mixture; finally, the mixture is extruded into a sheet using a twin-screw extruder, cooled, and discharged to obtain the final product.
[0016] Further preferably, the stirring rate is 1000-1200 r / min; the extrusion molding conditions are: rotation speed 80-90 r / min, temperature 160-170℃, and pressure 4-5 MPa.
[0017] Preferably, the thickness of polypropylene substrate I is 2-3 mm.
[0018] Preferably, when preparing the membrane, the thickness of the polypropylene substrate II is 1-2 mm, and the coating amount of the IMD-specific adhesive is 2-3 g / m². 2 The IMD-specific adhesive is IMB-003, purchased from Shenzhen Xinshun Screen Printing Equipment Co., Ltd.; the coating amount of the base ink is 2-3 g / m².2 The base ink is the 3500 series of ten-line inks; the thickness of the polyvinyl chloride sheet is 0.18 mm; and the coating amount of the adhesive is 1.5–1.6 g / m². 2 The adhesive is a two-component polyurethane adhesive, comprising component A and component B in a mass ratio of 4:1; the thickness of the polypropylene substrate III is 0.1 mm; the skin-feel coating is obtained by uniformly applying a skin-feel coating material, and the coating amount of the skin-feel coating is 3-4 g / m². 2 .
[0019] More preferably, the skin-feel coating is obtained by uniformly mixing the following components in parts by weight: 45-55 parts of waterborne acrylic resin, 6-8 parts of trimethylolpropane triacrylate, 6-8 parts of hydroxyethyl methacrylate, 15-20 parts of polyacrylate nanospheres, 0.2-0.3 parts of silicone leveling agent, 0.2-0.3 parts of polyether defoamer, and 4-5 parts of methyl benzoate.
[0020] More preferably, the polyacrylate nanospheres are prepared by the following method: first, ammonium persulfate, 12-crown ether-4 and deionized water are mixed evenly to obtain an aqueous solution; then, the aqueous solution is mixed evenly with acrylate monomers, deoxygenated, kept at a temperature under sealed conditions, and post-treated to obtain the final product; wherein, the mass ratio of ammonium persulfate, 12-crown ether-4, deionized water and acrylate monomers is 0.03-0.04:0.3-0.4:100:0.7-0.8.
[0021] More preferably, the acrylate monomer is selected from one or more of methyl methacrylate, ethyl methacrylate, and butyl methacrylate.
[0022] A further preferred method for deoxygenation is as follows: under nitrogen purging, stir at a stirring rate of 300-400 r / min for 20-30 minutes; the heat preservation condition is: 65-75℃ for 5-7 hours; the post-treatment includes: centrifugation to collect the precipitate, washing with water, washing with anhydrous ethanol, and vacuum drying.
[0023] Further preferably, after applying the skin-feel coating, the wavelength is 395nm and the energy is 200mJ / cm. 2 LED UV curing for 2-3 seconds, followed by UV curing at a wavelength of 365nm and an energy of 400mJ / cm². 2 UV curing for 1-2 seconds.
[0024] Preferably, in the preparation of the special ink, the polystyrene nanospheres are prepared by the following method: first, ammonium persulfate, 12-crown ether-4 and deionized water are mixed evenly to obtain an aqueous solution; then, the aqueous solution is mixed evenly with styrene monomer, deoxygenated, kept at a temperature under sealed conditions, and post-treated to obtain the final product; wherein, the mass ratio of ammonium persulfate, 12-crown ether-4, deionized water and styrene monomer is 0.03~0.04:0.3~0.4:100:0.7~0.8.
[0025] A further preferred method for deoxygenation is as follows: under nitrogen purging, stir at a stirring rate of 300-400 r / min for 20-30 minutes; the heat preservation condition is: 65-75℃ for 5-7 hours; the post-treatment includes: centrifugation to collect the precipitate, washing with water, washing with anhydrous ethanol, and vacuum drying.
[0026] Preferably, in the preparation of the special ink, the surfactant is sodium dodecylbenzenesulfonate, sodium lauryl sulfate, or an alkyl sulfonate; and the dispersant is Solsperse 39000 or Solsperse 22000.
[0027] Preferably, in step (1), the amount of adhesive applied is 1.5–1.6 g / m³. 2 The adhesive is a two-component polyurethane adhesive, comprising component A and component B in a mass ratio of 4:1.
[0028] Preferably, in step (2), the coating amount of the special ink is 3.5–4 g / m². 2 .
[0029] Preferably, in step (3), the coating amount of the color ink is 2-3 g / m. 2 The color ink is a water-based UV ink, series 1710, purchased from Shenzhen Guangyi Songjing Ink Technology Co., Ltd.
[0030] Preferably, in step (4), the hot pressing molding conditions are: baking at 340℃ for 15s and molding for 15s.
[0031] A decorative cover is obtained through the aforementioned manufacturing process.
[0032] Compared with the prior art, the present invention has the following beneficial effects:
[0033] This invention provides a decorative cover and its manufacturing process, comprising the following steps: first, uniformly coating an adhesive onto the surface of a polypropylene substrate I to form an adhesive layer; then, uniformly coating a special ink onto the surface of the adhesive layer to form a first ink layer; next, uniformly coating a colored ink onto the surface of the first ink layer to form a second ink layer; finally, laminating a film onto the surface of the second ink layer, hot-pressing, punching, wiping the printed surface of the film with alcohol, and in-mold injection molding to obtain the final product. This invention uses IMD technology to manufacture the decorative cover, introducing special ink to increase the adhesion between the film and the substrate. The resulting decorative cover is suitable for washing machines, exhibiting excellent performance and aesthetic appeal.
[0034] The special ink of this invention is made by mixing the following components: water-based acrylic resin, microcrystalline wax, N,N-dimethylaniline, polystyrene nanospheres, azobisisobutyronitrile, pigment, triethylamine, surfactant, dispersant, 1-butyl-3-methylimidazolium tetrafluoroborate, and N-octyl-4-methylpyridine tetrafluoroborate. The polystyrene nanospheres and the ionic liquids (1-butyl-3-methylimidazolium tetrafluoroborate and N-octyl-4-methylpyridine tetrafluoroborate) synergistically improve adhesion to polypropylene substrates.
[0035] The diaphragm is obtained by sequentially laminating IMD-specific adhesive, base ink, PVC sheet, adhesive, polypropylene substrate III, and a skin-feel coating onto the surface of polypropylene substrate II. The skin-feel coating is formed by uniformly mixing the following components: water-based acrylic resin, trimethylolpropane triacrylate, hydroxyethyl methacrylate, polyacrylate nanospheres, silicone leveling agent, polyether defoamer, and methyl benzoate. This skin-feel coating provides more comprehensive protection and improves the performance of the decorative cover. Detailed Implementation
[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0037] The water-based acrylic resin involved in this invention was purchased from Zhongshan Langma Chemical Industry Co., Ltd.; the two-component polyurethane adhesive was purchased from Jinan Shanxing Chemical Co., Ltd.
[0038] Example 1
[0039] A manufacturing process for a decorative cover includes the following steps:
[0040] (1) First, apply glue evenly to the surface of polypropylene substrate I to form an glue layer;
[0041] (2) Next, a special ink is evenly coated on the surface of the adhesive layer to form the first ink layer;
[0042] (3) Then, uniformly coat the surface of the first ink layer with colored ink to form the second ink layer;
[0043] (4) Finally, a film is laminated on the surface of the second ink layer, hot-pressed, punched, the printed surface of the film is wiped with alcohol, and in-mold injection molding is performed to obtain the decorative cover.
[0044] The special ink is made by mixing the following components: 10 kg of water-based acrylic resin, 1.2 kg of microcrystalline wax, 0.2 kg of N,N-dimethylaniline, 0.2 kg of polystyrene nanospheres, 0.3 kg of azobisisobutyronitrile, 5 kg of pigment, 0.3 kg of triethylamine, 0.8 kg of surfactant, 0.3 kg of dispersant, 0.2 kg of 1-butyl-3-methylimidazolium tetrafluoroborate, and 0.1 kg of N-octyl-4-methylpyridine tetrafluoroborate;
[0045] The diaphragm is obtained by sequentially laminating IMD special adhesive, base ink, polyvinyl chloride sheet, adhesive, polypropylene substrate III, and skin-feel coating onto the surface of polypropylene substrate II.
[0046] The polypropylene substrate I, polypropylene substrate II, or polypropylene substrate III is prepared by the following method: First, 10 kg of polypropylene masterbatch is heated to 160°C, then 0.1 kg of antimony trioxide and 0.9 kg of styrene-butadiene rubber are added, and the mixture is kept warm and stirred for 20 minutes; then 0.3 kg of light calcium carbonate, 0.7 kg of phosphite, 0.3 kg of nano zinc oxide, and 0.3 kg of phthalate are added, and the mixture is kept warm and stirred for 20 minutes to obtain a mixture; finally, the mixture is extruded into a sheet using a twin-screw extruder, cooled, and discharged to obtain the final product.
[0047] The stirring rate was 1000 r / min; the extrusion molding conditions were: rotation speed 80 r / min, temperature 160℃, and pressure 4 MPa.
[0048] The thickness of polypropylene substrate I is 2 mm.
[0049] In preparing the membrane, the thickness of the polypropylene substrate II is 1 mm, and the coating amount of the IMD-specific adhesive is 2 g / m². 2 The IMD-specific adhesive is IMB-003, purchased from Shenzhen Xinshun Screen Printing Equipment Co., Ltd.; the coating amount of the base ink is 2g / m². 2 The base ink is the 3500 series of ten-line inks; the thickness of the polyvinyl chloride sheet is 0.18 mm; and the coating amount of the adhesive is 1.5 g / m². 2The adhesive is a two-component polyurethane adhesive, comprising component A and component B in a mass ratio of 4:1; the thickness of the polypropylene substrate III is 0.1 mm; the skin-feel coating is obtained by uniformly applying a skin-feel coating material, and the coating amount of the skin-feel coating is 3 g / m². 2 .
[0050] The skin-feel coating is obtained by uniformly mixing the following components: 45 kg of water-based acrylic resin, 6 kg of trimethylolpropane triacrylate, 6 kg of hydroxyethyl methacrylate, 15 kg of polyacrylate nanospheres, 0.2 kg of silicone leveling agent, 0.2 kg of polyether defoamer, and 4 kg of methyl benzoate.
[0051] Polyacrylate nanospheres were prepared by the following method: ammonium persulfate, 12-crown ether-4 and deionized water were mixed evenly to obtain an aqueous solution; then the aqueous solution was mixed evenly with acrylate monomers, deoxygenated, kept at a temperature under sealed conditions, and post-treated to obtain the final product; wherein the mass ratio of ammonium persulfate, 12-crown ether-4, deionized water and acrylate monomers was 0.03:0.3:100:0.7.
[0052] The acrylate monomer is methyl methacrylate.
[0053] The deoxygenation method is as follows: under nitrogen purging, stir at a stirring rate of 300 r / min for 20 minutes to remove oxygen; the heat preservation condition is: 65℃ for 5 hours; the post-treatment includes: centrifugation to collect the precipitate, washing with water, washing with anhydrous ethanol, and vacuum drying.
[0054] After applying the skin-feel coating, at a wavelength of 395nm and an energy of 200mJ / cm 2 LED UV curing for 2 seconds, followed by UV curing at a wavelength of 365nm and an energy of 400mJ / cm². 2 UV curing for 1 second.
[0055] In the preparation of the special ink, the polystyrene nanospheres are prepared by the following method: first, ammonium persulfate, 12-crown ether-4 and deionized water are mixed evenly to obtain an aqueous solution; then, the aqueous solution is mixed evenly with styrene monomer, deoxygenated, kept at a temperature under sealed conditions, and post-treated to obtain the final product; wherein, the mass ratio of ammonium persulfate, 12-crown ether-4, deionized water and styrene monomer is 0.03:0.3:100:0.7.
[0056] The deoxygenation method is as follows: under nitrogen purging, stir at a stirring rate of 300 r / min for 20 minutes to remove oxygen; the heat preservation condition is: 65℃ for 5 hours; the post-treatment includes: centrifugation to collect the precipitate, washing with water, washing with anhydrous ethanol, and vacuum drying.
[0057] In the preparation of the special ink, the surfactant is sodium dodecylbenzenesulfonate; the dispersant is Solsperse 39000.
[0058] In step (1), the amount of adhesive applied is 1.5 g / m. 2 The adhesive is a two-component polyurethane adhesive, comprising component A and component B in a mass ratio of 4:1.
[0059] In step (2), the coating amount of the special ink is 3.5 g / m². 2 .
[0060] In step (3), the coating amount of the colored ink is 2 g / m 2 The color ink is a water-based UV ink, series 1710, purchased from Shenzhen Guangyi Songjing Ink Technology Co., Ltd.
[0061] In step (4), the hot pressing molding conditions are: baking at 340℃ for 15s and mold closing for 15s.
[0062] Example 2
[0063] A manufacturing process for a decorative cover includes the following steps:
[0064] (1) First, apply glue evenly to the surface of polypropylene substrate I to form an glue layer;
[0065] (2) Next, a special ink is evenly coated on the surface of the adhesive layer to form the first ink layer;
[0066] (3) Then, uniformly coat the surface of the first ink layer with colored ink to form the second ink layer;
[0067] (4) Finally, a film is laminated on the surface of the second ink layer, hot-pressed, punched, the printed surface of the film is wiped with alcohol, and in-mold injection molding is performed to obtain the decorative cover.
[0068] The special ink is made by mixing the following components: 10 kg of water-based acrylic resin, 1.5 kg of microcrystalline wax, 0.3 kg of N,N-dimethylaniline, 0.3 kg of polystyrene nanospheres, 0.4 kg of azobisisobutyronitrile, 6 kg of pigment, 0.5 kg of triethylamine, 1 kg of surfactant, 0.5 kg of dispersant, 0.3 kg of 1-butyl-3-methylimidazolium tetrafluoroborate, and 0.2 kg of N-octyl-4-methylpyridine tetrafluoroborate.
[0069] The diaphragm is obtained by sequentially laminating IMD special adhesive, base ink, polyvinyl chloride sheet, adhesive, polypropylene substrate III, and skin-feel coating onto the surface of polypropylene substrate II.
[0070] The polypropylene substrate I, polypropylene substrate II, or polypropylene substrate III is prepared by the following method: First, 10 kg of polypropylene masterbatch is heated to 170°C, then 0.2 kg of antimony trioxide and 1.1 kg of styrene-butadiene rubber are added, and the mixture is kept warm and stirred for 30 minutes; then 0.4 kg of light calcium carbonate, 0.9 kg of phosphite, 0.4 kg of nano zinc oxide, and 0.4 kg of phthalate are added, and the mixture is kept warm and stirred for 30 minutes to obtain a mixture; finally, the mixture is extruded into a sheet using a twin-screw extruder, cooled, and discharged to obtain the final product.
[0071] The stirring rate was 1200 r / min; the extrusion molding conditions were: 90 r / min, 170℃, and 5 MPa.
[0072] The thickness of polypropylene substrate I is 3 mm.
[0073] In preparing the membrane, the thickness of the polypropylene substrate II is 2 mm, and the coating amount of the IMD-specific adhesive is 3 g / m². 2 The IMD-specific adhesive is IMB-003, purchased from Shenzhen Xinshun Screen Printing Equipment Co., Ltd.; the coating amount of the base ink is 3g / m². 2 The base ink is the 3500 series of ten-line inks; the thickness of the polyvinyl chloride sheet is 0.18 mm; and the coating amount of the adhesive is 1.6 g / m². 2 The adhesive is a two-component polyurethane adhesive, comprising component A and component B in a mass ratio of 4:1; the thickness of the polypropylene substrate III is 0.1 mm; the skin-feel coating is obtained by uniformly applying a skin-feel coating material, and the coating amount of the skin-feel coating is 4 g / m². 2 .
[0074] The skin-feel coating is obtained by uniformly mixing the following components: 55 kg of water-based acrylic resin, 8 kg of trimethylolpropane triacrylate, 8 kg of hydroxyethyl methacrylate, 20 kg of polyacrylate nanospheres, 0.3 kg of silicone leveling agent, 0.3 kg of polyether defoamer, and 5 kg of methyl benzoate.
[0075] Polyacrylate nanospheres were prepared by the following method: ammonium persulfate, 12-crown ether-4 and deionized water were mixed evenly to obtain an aqueous solution; then the aqueous solution was mixed evenly with acrylate monomers, deoxygenated, kept at a temperature under sealed conditions, and post-treated to obtain the final product; wherein the mass ratio of ammonium persulfate, 12-crown ether-4, deionized water and acrylate monomers was 0.04: 0.4: 100: 0.8.
[0076] The acrylate monomer is ethyl methacrylate.
[0077] The deoxygenation method is as follows: under nitrogen purging, stir at a stirring rate of 400 r / min for 30 minutes to remove oxygen; the heat preservation condition is: 75℃ for 7 hours; the post-treatment includes: centrifugation to collect the precipitate, washing with water, washing with anhydrous ethanol, and vacuum drying.
[0078] After applying the skin-feel coating, at a wavelength of 395nm and an energy of 200mJ / cm 2 LED UV curing for 3 seconds, followed by UV curing at a wavelength of 365nm and an energy of 400mJ / cm². 2 UV curing for 2 seconds.
[0079] In the preparation of the special ink, the polystyrene nanospheres are prepared by the following method: first, ammonium persulfate, 12-crown ether-4 and deionized water are mixed evenly to obtain an aqueous solution; then, the aqueous solution is mixed evenly with styrene monomer, deoxygenated, kept at a temperature under sealed conditions, and post-treated to obtain the final product; wherein, the mass ratio of ammonium persulfate, 12-crown ether-4, deionized water and styrene monomer is 0.04:0.4:100:0.8.
[0080] The deoxygenation method is as follows: under nitrogen purging, stir at a stirring rate of 400 r / min for 30 minutes to remove oxygen; the heat preservation condition is: 75℃ for 7 hours; the post-treatment includes: centrifugation to collect the precipitate, washing with water, washing with anhydrous ethanol, and vacuum drying.
[0081] In the preparation of the special ink, the surfactant is sodium lauryl sulfate; the dispersant is Solsperse 22000.
[0082] In step (1), the amount of adhesive applied is 1.6 g / m. 2 The adhesive is a two-component polyurethane adhesive, comprising component A and component B in a mass ratio of 4:1.
[0083] In step (2), the coating amount of the special ink is 4 g / m². 2 .
[0084] In step (3), the coating amount of the colored ink is 3 g / m 2 The color ink is a water-based UV ink, series 1710, purchased from Shenzhen Guangyi Songjing Ink Technology Co., Ltd.
[0085] In step (4), the hot pressing molding conditions are: baking at 340℃ for 15s and mold closing for 15s.
[0086] Example 3
[0087] A manufacturing process for a decorative cover includes the following steps:
[0088] (1) First, apply glue evenly to the surface of polypropylene substrate I to form an glue layer;
[0089] (2) Next, a special ink is evenly coated on the surface of the adhesive layer to form the first ink layer;
[0090] (3) Then, uniformly coat the surface of the first ink layer with colored ink to form the second ink layer;
[0091] (4) Finally, a film is laminated on the surface of the second ink layer, hot-pressed, punched, the printed surface of the film is wiped with alcohol, and in-mold injection molding is performed to obtain the decorative cover.
[0092] The special ink is made by mixing the following components: 10 kg of water-based acrylic resin, 1.3 kg of microcrystalline wax, 0.25 kg of N,N-dimethylaniline, 0.25 kg of polystyrene nanospheres, 0.35 kg of azobisisobutyronitrile, 5.5 kg of pigment, 0.4 kg of triethylamine, 0.9 kg of surfactant, 0.4 kg of dispersant, 0.25 kg of 1-butyl-3-methylimidazolium tetrafluoroborate, and 0.15 kg of N-octyl-4-methylpyridine tetrafluoroborate.
[0093] The diaphragm is obtained by sequentially laminating IMD special adhesive, base ink, polyvinyl chloride sheet, adhesive, polypropylene substrate III, and skin-feel coating onto the surface of polypropylene substrate II.
[0094] The polypropylene substrate I, polypropylene substrate II, or polypropylene substrate III is prepared by the following method: First, 10 kg of polypropylene masterbatch is heated to 165°C, then 0.15 kg of antimony trioxide and 1 kg of styrene-butadiene rubber are added, and the mixture is kept warm and stirred for 25 minutes; then 0.35 kg of light calcium carbonate, 0.8 kg of phosphite, 0.35 kg of nano zinc oxide, and 0.35 kg of phthalate are added, and the mixture is kept warm and stirred for 25 minutes to obtain a mixture; finally, the mixture is extruded into a sheet using a twin-screw extruder, cooled, and discharged to obtain the final product.
[0095] The stirring rate was 1100 r / min; the extrusion molding conditions were: 90 r / min, 165℃, and 4 MPa.
[0096] The thickness of polypropylene substrate I is 2.5 mm.
[0097] In preparing the membrane, the thickness of the polypropylene substrate II is 1.5 mm, and the coating amount of the IMD-specific adhesive is 2.5 g / m². 2 The IMD-specific adhesive is IMB-003, purchased from Shenzhen Xinshun Screen Printing Equipment Co., Ltd.; the coating amount of the base ink is 2.5 g / m². 2 The base ink is the 3500 series of ten-line inks; the thickness of the polyvinyl chloride sheet is 0.18 mm; and the coating amount of the adhesive is 1.5 g / m². 2The adhesive is a two-component polyurethane adhesive, comprising component A and component B in a mass ratio of 4:1; the thickness of the polypropylene substrate III is 0.1 mm; the skin-feel coating is obtained by uniformly applying a skin-feel coating material, and the coating amount is 3.5 g / m². 2 .
[0098] The skin-feel coating is obtained by uniformly mixing the following components: 50 kg of water-based acrylic resin, 7 kg of trimethylolpropane triacrylate, 7 kg of hydroxyethyl methacrylate, 18 kg of polyacrylate nanospheres, 0.25 kg of silicone leveling agent, 0.25 kg of polyether defoamer, and 4.5 kg of methyl benzoate.
[0099] Polyacrylate nanospheres were prepared by the following method: ammonium persulfate, 12-crown ether-4 and deionized water were mixed evenly to obtain an aqueous solution; then the aqueous solution was mixed evenly with acrylate monomers, deoxygenated, kept at a temperature under sealed conditions, and post-treated to obtain the final product; wherein the mass ratio of ammonium persulfate, 12-crown ether-4, deionized water and acrylate monomers was 0.035:0.35:100:0.75.
[0100] The acrylate monomer is butyl methacrylate.
[0101] The deoxygenation method is as follows: under nitrogen purging, stir at a stirring rate of 400 r / min for 25 minutes to remove oxygen; the heat preservation condition is: heat preservation at 70℃ for 6 hours; the post-treatment includes: centrifugation to collect the precipitate, washing with water, washing with anhydrous ethanol, and vacuum drying.
[0102] After applying the skin-feel coating, at a wavelength of 395nm and an energy of 200mJ / cm 2 LED UV curing for 2 seconds, followed by UV curing at a wavelength of 365nm and an energy of 400mJ / cm². 2 UV curing for 1 second.
[0103] In the preparation of the special ink, the polystyrene nanospheres are prepared by the following method: first, ammonium persulfate, 12-crown ether-4 and deionized water are mixed evenly to obtain an aqueous solution; then, the aqueous solution is mixed evenly with styrene monomer, deoxygenated, kept at a temperature under sealed conditions, and post-treated to obtain the final product; wherein, the mass ratio of ammonium persulfate, 12-crown ether-4, deionized water and styrene monomer is 0.035:0.35:100:0.75.
[0104] The deoxygenation method is as follows: under nitrogen purging, stir at a stirring rate of 400 r / min for 25 minutes to remove oxygen; the heat preservation condition is: heat preservation at 70℃ for 6 hours; the post-treatment includes: centrifugation to collect the precipitate, washing with water, washing with anhydrous ethanol, and vacuum drying.
[0105] In the preparation of the special ink, the surfactant is an alkyl sulfonate; the dispersant is Solsperse 39000.
[0106] In step (1), the amount of adhesive applied is 1.6 g / m. 2 The adhesive is a two-component polyurethane adhesive, comprising component A and component B in a mass ratio of 4:1.
[0107] In step (2), the coating amount of the special ink is 3.5 g / m². 2 .
[0108] In step (3), the coating amount of the color ink is 2.5 g / m. 2 The color ink is a water-based UV ink, series 1710, purchased from Shenzhen Guangyi Songjing Ink Technology Co., Ltd.
[0109] In step (4), the hot pressing molding conditions are: baking at 340℃ for 15s and mold closing for 15s.
[0110] Comparative Example 1
[0111] Polystyrene nanospheres are omitted when preparing special inks;
[0112] The rest is the same as in Example 1.
[0113] Comparative Example 2
[0114] 1-Butyl-3-methylimidazolium tetrafluoroborate is omitted when preparing special inks;
[0115] The rest is the same as in Example 1.
[0116] Comparative Example 3
[0117] When preparing special inks, N-octyl-4-methylpyridine tetrafluoroborate is omitted;
[0118] The rest is the same as in Example 1.
[0119] Comparative Example 4
[0120] A manufacturing process for a decorative cover includes the following steps:
[0121] (1) First, apply glue evenly to the surface of polypropylene substrate I to form an glue layer;
[0122] (2) Next, evenly coat the surface of the adhesive layer with colored ink to form an ink layer;
[0123] (3) Finally, a film is laminated on the surface of the ink layer, hot-pressed, punched, the printed surface of the film is wiped with alcohol, and in-mold injection molding is performed to obtain the decorative cover.
[0124] The diaphragm is obtained by sequentially laminating IMD special adhesive, base ink, polyvinyl chloride sheet, adhesive, polypropylene substrate III, and skin-feel coating onto the surface of polypropylene substrate II.
[0125] The polypropylene substrate I, polypropylene substrate II, or polypropylene substrate III is prepared by the following method: First, 10 kg of polypropylene masterbatch is heated to 160°C, then 0.1 kg of antimony trioxide and 0.9 kg of styrene-butadiene rubber are added, and the mixture is kept warm and stirred for 20 minutes; then 0.3 kg of light calcium carbonate, 0.7 kg of phosphite, 0.3 kg of nano zinc oxide, and 0.3 kg of phthalate are added, and the mixture is kept warm and stirred for 20 minutes to obtain a mixture; finally, the mixture is extruded into a sheet using a twin-screw extruder, cooled, and discharged to obtain the final product.
[0126] The stirring rate was 1000 r / min; the extrusion molding conditions were: rotation speed 80 r / min, temperature 160℃, and pressure 4 MPa.
[0127] The thickness of polypropylene substrate I is 2 mm.
[0128] In preparing the membrane, the thickness of the polypropylene substrate II is 1 mm, and the coating amount of the IMD-specific adhesive is 2 g / m². 2 The IMD-specific adhesive is IMB-003, purchased from Shenzhen Xinshun Screen Printing Equipment Co., Ltd.; the coating amount of the base ink is 2g / m². 2 The base ink is the 3500 series of ten-line inks; the thickness of the polyvinyl chloride sheet is 0.18 mm; and the coating amount of the adhesive is 1.5 g / m². 2 The adhesive is a two-component polyurethane adhesive, comprising component A and component B in a mass ratio of 4:1; the thickness of the polypropylene substrate III is 0.1 mm; the skin-feel coating is obtained by uniformly applying a skin-feel coating material, and the coating amount of the skin-feel coating is 3 g / m². 2 .
[0129] The skin-feel coating is obtained by uniformly mixing the following components: 45 kg of water-based acrylic resin, 6 kg of trimethylolpropane triacrylate, 6 kg of hydroxyethyl methacrylate, 15 kg of polyacrylate nanospheres, 0.2 kg of silicone leveling agent, 0.2 kg of polyether defoamer, and 4 kg of methyl benzoate.
[0130] Polyacrylate nanospheres were prepared by the following method: ammonium persulfate, 12-crown ether-4 and deionized water were mixed evenly to obtain an aqueous solution; then the aqueous solution was mixed evenly with acrylate monomers, deoxygenated, kept at a temperature under sealed conditions, and post-treated to obtain the final product; wherein the mass ratio of ammonium persulfate, 12-crown ether-4, deionized water and acrylate monomers was 0.03:0.3:100:0.7.
[0131] The acrylate monomer is methyl methacrylate.
[0132] The deoxygenation method is as follows: under nitrogen purging, stir at a stirring rate of 300 r / min for 20 minutes to remove oxygen; the heat preservation condition is: 65℃ for 5 hours; the post-treatment includes: centrifugation to collect the precipitate, washing with water, washing with anhydrous ethanol, and vacuum drying.
[0133] After applying the skin-feel coating, at a wavelength of 395nm and an energy of 200mJ / cm 2 LED UV curing for 2 seconds, followed by UV curing at a wavelength of 365nm and an energy of 400mJ / cm². 2 UV curing for 1 second.
[0134] In step (1), the amount of adhesive applied is 1.5 g / m. 2 The adhesive is a two-component polyurethane adhesive, comprising component A and component B in a mass ratio of 4:1.
[0135] In step (2), the coating amount of the colored ink is 2 g / m 2 The color ink is a water-based UV ink, series 1710, purchased from Shenzhen Guangyi Songjing Ink Technology Co., Ltd.
[0136] In step (3), the hot pressing molding conditions are: baking at 340℃ for 15s and mold closing for 15s.
[0137] Comparative Example 5
[0138] When preparing the membrane, the skin-feel coating omits polyacrylate nanospheres;
[0139] The rest is the same as in Example 1.
[0140] Test case
[0141] The performance of the decorative covers obtained in Examples 1-3 and Comparative Examples 1-5 was tested, specifically including:
[0142] 1. Modulus of fracture: The modulus of fracture that the decorative cover can withstand is tested using a modulus of fracture measuring instrument.
[0143] 2. Washability and abrasion resistance: 500g load + rubbing with wet wipe (laundry detergent solution, mass concentration 0.5%), wiping frequency 40 times / minute, cycle 500 times, visually observe the changes in the decorative cover.
[0144] 3. Gloss loss rate after damp heat aging: 60℃, 95%RH, 240h.
[0145] The test results are shown in Table 1.
[0146] Table 1. Performance Test of Decorative Cover
[0147] As shown in Table 1, the decorative covers obtained in Examples 1 to 3 have a high modulus of rupture, good washability and abrasion resistance, and are resistant to damp heat aging. They can be used for a long time in the washing machine environment and have excellent performance.
[0148] In Comparative Example 1, polystyrene nanospheres were omitted during the preparation of the special ink. In Comparative Example 2, 1-butyl-3-methylimidazolium tetrafluoroborate was omitted during the preparation of the special ink. In Comparative Example 3, N-octyl-4-methylpyridine tetrafluoroborate was omitted during the preparation of the special ink. In Comparative Example 4, the special ink was omitted. In Comparative Example 5, polyacrylate nanospheres were omitted during the preparation of the film. These omissions directly affected the adhesion to the substrate surface, resulting in a significant deterioration in the modulus of rupture, scrub resistance, and resistance to damp heat aging.
[0149] The present invention has been illustrated through the above embodiments, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of individual raw materials in the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.
Claims
1. A manufacturing process for a decorative cover, characterized in that, Includes the following steps: (1) First, apply glue evenly to the surface of polypropylene substrate I to form an glue layer; (2) Next, a special ink is evenly coated on the surface of the adhesive layer to form the first ink layer; (3) Then, uniformly coat the surface of the first ink layer with colored ink to form the second ink layer; (4) Finally, a film is laminated on the surface of the second ink layer, hot-pressed, punched, the printed surface of the film is wiped with alcohol, and in-mold injection molding is performed to obtain the decorative cover. The special ink is made by mixing the following components in parts by weight: 10 parts water-based acrylic resin, 1.2-1.5 parts microcrystalline wax, 0.2-0.3 parts N,N-dimethylaniline, 0.2-0.3 parts polystyrene nanospheres, 0.3-0.4 parts azobisisobutyronitrile, 5-6 parts pigment, 0.3-0.5 parts triethylamine, 0.8-1 part surfactant, 0.3-0.5 parts dispersant, 0.2-0.3 parts 1-butyl-3-methylimidazolium tetrafluoroborate, and 0.1-0.2 parts N-octyl-4-methylpyridine tetrafluoroborate; The diaphragm is obtained by sequentially laminating IMD special adhesive, base ink, polyvinyl chloride sheet, adhesive, polypropylene substrate III, and skin-feel coating onto the surface of polypropylene substrate II.
2. The manufacturing process according to claim 1, characterized in that, By weight, the polypropylene substrate I, polypropylene substrate II, or polypropylene substrate III is prepared by the following method: First, 10 parts of polypropylene masterbatch are heated to 160-170°C, then 0.1-0.2 parts of antimony trioxide and 0.9-1.1 parts of styrene-butadiene rubber are added, and the mixture is kept warm and stirred for 20-30 minutes; then 0.3-0.4 parts of light calcium carbonate, 0.7-0.9 parts of phosphite, 0.3-0.4 parts of nano zinc oxide, and 0.3-0.4 parts of phthalate are added, and the mixture is kept warm and stirred for 20-30 minutes to obtain a mixture; finally, the mixture is extruded into a sheet using a twin-screw extruder, cooled, and discharged to obtain the final product.
3. The manufacturing process according to claim 1, characterized in that, The thickness of polypropylene substrate I is 2-3 mm.
4. The manufacturing process according to claim 1, characterized in that, When preparing the membrane, the thickness of the polypropylene substrate II is 1-2 mm, and the coating amount of the IMD-specific adhesive is 2-3 g / m. 2 The coating amount of the base ink is 2-3 g / m³. 2 The base ink is the 3500 series of ten-line inks; the thickness of the polyvinyl chloride sheet is 0.18 mm; and the coating amount of the adhesive is 1.5–1.6 g / m². 2 The adhesive is a two-component polyurethane adhesive, comprising component A and component B in a mass ratio of 4:1; the thickness of the polypropylene substrate III is 0.1 mm; the skin-feel coating is obtained by uniformly applying a skin-feel coating material, and the coating amount of the skin-feel coating is 3-4 g / m². 2 .
5. The manufacturing process according to claim 1, characterized in that, In the preparation of the special ink, the polystyrene nanospheres are prepared by the following method: first, ammonium persulfate, 12-crown ether-4 and deionized water are mixed evenly to obtain an aqueous solution; then, the aqueous solution is mixed evenly with styrene monomer, deoxygenated, kept at a temperature under sealed conditions, and post-treated to obtain the final product; wherein, the mass ratio of ammonium persulfate, 12-crown ether-4, deionized water and styrene monomer is 0.03~0.04:0.3~0.4:100:0.7~0.
8.
6. The manufacturing process according to claim 1, characterized in that, In the preparation of special inks, the surfactant is sodium dodecylbenzenesulfonate, sodium lauryl sulfate, or alkyl sulfonate; the dispersant is Solsperse 39000 or Solsperse 22000.
7. The manufacturing process according to claim 1, characterized in that, In step (1), the amount of adhesive applied is 1.5–1.6 g / m². 2 The adhesive is a two-component polyurethane adhesive, comprising component A and component B in a mass ratio of 4:
1.
8. The manufacturing process according to claim 1, characterized in that, In step (2), the coating amount of the special ink is 3.5–4 g / m². 2 .
9. The manufacturing process according to claim 1, characterized in that, In step (3), the coating amount of the colored ink is 2-3 g / m². 2 ; In step (4), the hot pressing molding conditions are: baking at 340℃ for 15s and mold closing for 15s.
10. A decorative cover, characterized in that, It is obtained by the manufacturing process described in any one of claims 1 to 9.
Citation Information
Patent Citations
Improved washing machine cover plate injection molding process
CN109130062A