Electrical equipment shell, mother film texture forming coating and preparation method thereof

Abstract

The invention relates to the technical field of manufacturing of shells and synthetic materials of electrical equipment, coatings and the like, and provides an electrical equipment shell, a mother film texture forming coating and a preparation method thereof, the electrical equipment shell has a decorative effect, and the mother film texture forming coating is used for forming the decorative effect. The mother film texture forming coating is prepared from the following components in percentage by weight: 20 to 30 percent of polyurethane UV2 functional resin, 40 to 60 percent of silicon modified diolefine acid resin, 10 to 20 percent of polycarbonate modified resin, 2 to 10 percent of hexanediol diacrylate and 0.1 to 1 percent of photoinitiator. The mother film texture forming coating is low in VOC emission, the environmental protection property of the electrical equipment shell texture setting process can be improved, and the mother film texture forming coating is good in stretchability.

Description

Technical Field

[0001] The invention relates to the technical fields of housing of electric equipment, manufacture of synthetic materials, curing coatings, and the like, and in particular to a housing of electric equipment, a parent film texture forming coating, and a preparation method thereof. Background Art

[0002] In the shell appearance design and production of electronic devices such as mobile phones and tablets, as well as automotive interior parts, in order to meet consumers' demand for shell appearance, the shell usually needs to be designed with a specific texture with decorative effect. Among them, the design of the shell texture needs to go through a series of texture treatment processes. These texture treatment processes mainly include applying a mother film texture forming coating on a textured mold to obtain a textured mother film, and then applying a sub-film texture coating on the textured mother film to obtain a textured sub-film with decorative effect. The textured sub-film, as a diaphragm with a textured decorative effect, can form an electrical equipment housing with a textured decorative effect after being bonded to the base material of the shell. In the prior art, the mother film texture forming coating has high VOC emissions and low environmental performance.

[0003] In summary, in the prior art, the texture forming technology for the casing of electrical equipment has technical problems such as high VOC emission of the parent film texture forming coating and low environmental performance. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned prior art, the present invention provides an electrical equipment housing, a mother film texture forming coating and a preparation method thereof, so as to reduce the VOC emissions of the mother film texture forming coating and improve the environmental friendliness of the electrical equipment housing texture setting process.

[0005] In a first aspect, the present invention provides an electrical equipment casing having a decorative effect. A mother film texture forming coating is used to form the decorative effect. The mother film texture forming coating comprises: 20-30% by weight of a polyurethane UV2 functional resin, 40-60% by weight of a silicon-modified acrylate resin, 10-20% by weight of a polycarbonate modified resin, 2-10% by weight of hexanediol diacrylate, and 0.1-1% by weight of a photoinitiator.

[0006] In a second aspect, the present invention provides a mother film texture forming coating, comprising: 20-30% by weight of a polyurethane UV2 functional resin, 40-60% by weight of a silicon-modified acrylate resin, 10-20% by weight of a polycarbonate modified resin, 2-10% by weight of hexanediol diacrylate and 0.1-1% by weight of a photoinitiator.

[0007] In a third aspect, the present invention provides a method for preparing a mother film texture forming coating, comprising: Stirring and mixing hexanediol diacrylate and a photoinitiator to obtain a first mixture; Adding polycarbonate modified resin, silicon modified acrylate resin and polyurethane UV2 functional resin to the first mixture in sequence and stirring to obtain a second mixture; The second mixture is subjected to a degassing treatment to obtain the mother film texture forming coating.

[0008] Compared with the prior art, the present invention has the following beneficial effects: The invention provides an electric equipment shell, a mother film texture forming coating and a preparation method thereof. The electric equipment shell has a decorative effect. The decorative effect is formed by using a mother film texture forming coating. The mother film texture forming coating comprises: 20-30% by weight of a polyurethane UV2 functional resin, 40-60% by weight of a silicon-modified acrylate resin, 10-20% by weight of a polycarbonate modified resin, 2-10% by weight of hexanediol diacrylate and 0.1-1% by weight of a photoinitiator. The mother film texture forming coating has very low VOC emissions, can improve the environmental friendliness of a texture setting process for an electric equipment shell, and has good stretchability. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their description are used to explain the present invention and do not constitute an improper limitation of the present invention. Some specific embodiments of the present invention will be described in detail in an exemplary and non-restrictive manner with reference to the drawings. The same reference numerals in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 It is a schematic flow chart of a method for preparing a mother film texture forming coating according to an embodiment of the present invention. DETAILED DESCRIPTION

[0010] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0011] Embodiment 1 See also Figure 1This embodiment provides an electrical device housing, which has a decorative effect. The decorative effect is formed by using a mother film texture forming coating, which includes: 20-30% by weight of polyurethane UV2 resin, 40-60% by weight of silicon-modified acrylate resin, 10-20% by weight of polycarbonate modified resin, 2-10% by weight of hexanediol diacrylate, and 0.1-1% by weight of a photoinitiator. When producing the mother film texture forming coating, the following specific implementation methods can be used.

[0012] In the first embodiment, the mother film texture forming coating comprises: 25% by weight of polyurethane UV2 resin, 55% by weight of silicon-modified acrylate resin, 15% by weight of polycarbonate modified resin, 4% by weight of hexanediol diacrylate and 1% by weight of photoinitiator. After the weight percentage is selected, the hexanediol diacrylate and the photoinitiator are stirred and mixed, and the polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 resin are added in sequence and stirred, and deaerated to obtain the mother film texture forming coating. In the first embodiment, the test sample of the mother film texture forming coating has the following characteristics. The tensile strength is 71-81 MPa, the tensile elastic modulus is 3100-4100 MPa, and the elongation at break is 3.2-6.2%, indicating that the material has good toughness, the flexural strength is maintained at 132-152 MPa, the flexural elastic modulus ranges from 3050-4050 MPa, the impact strength is 11-21 kJ / m², and the glass transition temperature is 91-111°C. Among them, the content of polyurethane UV2 functional resin is moderate (25%), which can ensure good elasticity and strength; the silicon-modified acrylate resin (55%) improves weather resistance and impact resistance; the high proportion of photoinitiator (1%) promotes curing efficiency, and the material performance is balanced.

[0013] In Embodiment 2, the mother film texture forming coating comprises: 20% by weight of polyurethane UV2 resin, 60% by weight of silicon-modified acrylate resin, 10% by weight of polycarbonate modified resin, 9.9% by weight of hexanediol diacrylate and 0.1% by weight of photoinitiator. After the weight percentage is selected, the hexanediol diacrylate and the photoinitiator are stirred and mixed, and the polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 resin are added in sequence and stirred, and deaerated to obtain the mother film texture forming coating. In Embodiment 2, the test sample of the mother film texture forming coating has the following characteristics. The tensile strength is 70-80MPa, the tensile elastic modulus is 3000-4000 MPa, the elongation at break is 3.0-5.9%, the flexural strength ranges from 130-150 MPa, the flexural elastic modulus is 3000-4000 MPa, the impact strength is 10.9-20.9 kJ / m², and the glass transition temperature is 90-110℃. Among them, the proportion of polyurethane UV2 functional resin is 20%, and the elasticity and toughness are slightly reduced; the content of silicon-modified acrylate resin is 60%, making the material more rigid; the proportion of photoinitiator is 0.1%, and the curing efficiency is slightly affected.

[0014] Embodiment 3, the mother film texture forming coating comprises: 30% by weight of polyurethane UV2 resin, 50% by weight of silicon-modified acrylate resin, 15% by weight of polycarbonate modified resin, 4.5% by weight of hexanediol diacrylate and 0.5% by weight of photoinitiator. After the weight percentage is selected, the hexanediol diacrylate and the photoinitiator are stirred and mixed, and the polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 resin are added in sequence and stirred, and degassed to obtain the mother film texture forming coating. In embodiment 3, the test sample of the mother film texture forming coating has the following characteristics. The tensile strength is 72-82 MPa, the tensile elastic modulus is 3150-4150 MPa, the elongation at break is 3.3-6.3%, the bending strength ranges from 134-154 MPa, and the bending elastic modulus is 3075-4075 MPa. The impact strength is 12-22 kJ / m², and the glass transition temperature is 92-112℃. Among them, the polyurethane UV2 functional resin is 30%, which significantly improves the strength and toughness of the material; the proportion of silicon-modified acrylate resin is 50%, which enhances the elastic balance; the photoinitiator is 0.5%, which is a moderate proportion, with a stable curing rate and balanced performance.

[0015] Embodiment 4, the mother film texture forming coating comprises: 30% by weight of polyurethane UV2 functional resin, 40% by weight of silicon-modified acrylate resin, 20% by weight of polycarbonate modified resin, 9% by weight of hexanediol diacrylate and 1% by weight of photoinitiator. After the weight percentage is selected, the hexanediol diacrylate and the photoinitiator are stirred and mixed, and the polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 functional resin are added in sequence and stirred, and deaerated to obtain the mother film texture forming coating. In embodiment 4, the test sample of the mother film texture forming coating has the following characteristics. The tensile strength is 71-81MPa, the tensile elastic modulus is 3120-4120MPa, the elongation at break is 3.1-6.1%, the flexural strength is 133-153MPa, the flexural elastic modulus is 3060-4060MPa, the impact strength ranges from 11.5-21.5 kJ / m², and the glass transition temperature is 91.5-111.5℃. Among them, the proportion of polycarbonate modified resin is relatively high (20%), which enhances toughness and impact resistance; the proportion of silicon-modified acrylate resin is 40%, which maintains stable strength; the proportion of hexanediol diacrylate is 9%, which provides good flexibility and film-forming properties.

[0016] Embodiment 5, the mother film texture forming coating comprises: 30% by weight of polyurethane UV2 functional resin, 40% by weight of silicon-modified acrylate resin, 19.4% by weight of polycarbonate modified resin, 10% by weight of hexanediol diacrylate and 0.6% by weight of photoinitiator. After the weight percentage is selected, the hexanediol diacrylate and the photoinitiator are stirred and mixed, and the polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 functional resin are added in sequence and stirred, and deaerated to obtain the mother film texture forming coating. In embodiment 5, the test sample of the mother film texture forming coating has the following characteristics. The tensile strength is 72-82 MPa, the tensile elastic modulus is 3180-4180 MPa, the elongation at break is in the range of 3.4-6.4%, the flexural strength is 135-155 MPa, the flexural elastic modulus is 3090-4090 MPa, the impact strength is 12.5-22.5 kJ / m², and the glass transition temperature is 93-113°C. Among them, the proportion of polyurethane UV2 functional resin and silicon-modified acrylate resin is balanced (both 30% and 40%) to ensure strength and weather resistance; the proportion of hexanediol diacrylate is relatively high (10%) to improve flexibility and ductility; the photoinitiator is moderate (0.6%), and the curing performance is efficient.

[0017] In general, in the above embodiments, a high proportion of silicon-modified acrylate resin can increase the rigidity of the material, a high proportion of polyurethane UV2 resin can improve flexibility and toughness, a high proportion of hexanediol diacrylate can improve the film-forming effect, and the proportion of photoinitiator is moderate, so the curing efficiency can be improved. The mother film texture forming coating contains a photoinitiator (0.1-1%), and the resin is cured by ultraviolet light without the use of solvents, which significantly reduces VOC emissions. The UV curing system has almost no organic matter volatilized during the curing process, which meets environmental protection requirements, and can also accelerate the curing process and improve production efficiency. Silicon-modified acrylate resin is a silicone-modified acrylic resin. This type of resin has advantages in reducing VOC emissions because they have a high crosslinking density and solid content, can provide excellent coating properties, and reduce the use of solvents. Silicon-modified acrylic resins also have good weather resistance, chemical resistance and stain resistance, and are suitable for decorative coatings, especially in applications such as mobile phones, tablets and automotive interiors that have high requirements for appearance. Polyurethane UV2 resins and polycarbonate modified resins also have the characteristics of low VOC emissions. Polyurethane UV resins are usually high-solid or solvent-free, and can quickly form high-quality coatings through UV curing, reducing the amount of solvent used. Similarly, polycarbonate modified resins, with their good mechanical properties and environmental characteristics, further reduce the emission of volatile organic compounds.

[0018] It should also be noted that polyurethane UV2 official resin has excellent elasticity and flexibility. The molecular structure of polyurethane contains soft segments and hard segments, which can provide good stretchability and wear resistance, so that the coating will not easily break when stretched, thereby ensuring that the parent film texture forming coating has good flexibility. Polycarbonate modified resin is an engineering plastic with high strength and high toughness. By modifying and adding it to the coating, it can not only enhance the mechanical strength of the coating, but also improve its ductility. The good toughness of polycarbonate enables the coating to deform to a certain extent when subjected to external force without damaging the coating, helping to improve the tensile properties of the parent film. Silicon-modified acrylate resin has good flexibility and low modulus, which can improve the tensile properties of the coating. Hexanediol diacrylate is an active diluent that can improve the fluidity and flexibility of the coating. It can not only reduce the viscosity of the coating and facilitate coating, but also improve the toughness of the coating during the curing process, so that the parent film has good tensile properties, which is helpful for subsequent texture treatment.

[0019] In some preferred embodiments, the master film texture forming coating is applied on a mold with a texture and cured to form a texture master film, and a sub-film texture coating is applied on the texture master film, and the sub-film texture coating is cured to form a texture sub-film with a decorative effect, and the texture sub-film is bonded to the substrate of the electrical device housing to obtain an electrical device housing with a decorative effect. It should be noted that the master film texture forming coating is applied to a mold with a texture, and the micro-texture structure on the mold surface can be accurately replicated. The fine texture on the mold can be completely replicated to the master film surface through the curing process of the master film texture forming coating, thereby ensuring the accuracy and clarity of the texture. The role of the texture master film is to provide an accurate and stable texture template to ensure that the texture design is accurately presented on the final product. In addition, the texture master film formed after the master film texture forming coating is cured has a certain strength and durability, which can effectively protect the mold texture and ensure that the texture will not be damaged or deformed due to operation or environmental influences in subsequent operations. The master film, as an intermediate layer, prevents the sub-film from directly contacting the mold surface and reduces the risk of texture damage. In addition, in large-scale production, by using a unified mold and prefabricated master film, the decorative texture can be quickly replicated in batches, thereby improving production efficiency. In addition, both the master film and the daughter film are applied coating layers, and photoinitiators are used for curing during the curing process to avoid VOC emissions, improve the environmental performance of the production process, and meet the requirements of modern environmentally friendly manufacturing.

[0020] In some preferred embodiments, when the master film texture forming coating is coated on a mold with a texture and cured, an LED cold light curing device is used to irradiate the master film texture forming coating coated on the mold, so that the master film texture forming coating is cured to form the texture master film. It should be noted that the light emitted by the LED cold light curing device has low heat, and during the curing process, no excessive heat is generated, thereby protecting the quality of the mold and the coating. The modified resin in the master film texture forming coating is sensitive to high temperature. Using cold light curing can reduce the decomposition or performance degradation of the coating due to overheating, ensure the quality stability of the texture master film, and avoid surface defects or uneven curing. The LED curing device has a high-precision light control function, which can achieve uniform and directional irradiation. The uniform light ensures that the master film texture forming coating is uniformly cured on the entire surface, thereby forming a clear and complete texture master film, and there will be no local insufficient curing or over-curing. In addition, compared with traditional UV lamps or high-temperature curing equipment, LED cold light curing has lower energy consumption, which can reduce energy consumption in the production process.

[0021] In some further preferred embodiments, according to the different weight percentages of the photoinitiator, the LED cold light curing device is automatically controlled to cure the master film texture forming coating with an adapted light wave intensity and irradiation time. It should be noted that the photoinitiator releases active substances under the irradiation of LED light, triggering the polymerization reaction of the resin in the master film texture forming coating, resulting in the curing of the coating. The weight percentage (concentration) of the photoinitiator can directly determine the activity and efficiency of the photoreaction. If the concentration of the photoinitiator is high, the photocuring reaction rate is fast, and the required irradiation time can be shortened; if the concentration of the photoinitiator is low, the reaction rate is slow, and a longer irradiation time or a stronger light intensity is required to ensure sufficient curing. In this embodiment, by automatically adjusting the irradiation time of the LED cold light curing device according to the concentration of the photoinitiator, it can be ensured that the coating can be fully and evenly cured under different formulations, avoiding the problem of insufficient curing or over-curing. This can improve the adaptability and flexibility of the curing process. In addition, the concentration of the photoinitiator affects the depth and speed of light curing. When the concentration of the photoinitiator is low, the weaker light intensity may not be able to penetrate into the coating, resulting in faster curing of the surface layer but insufficient curing of the deep layer, resulting in incomplete curing. On the contrary, when the photoinitiator concentration is high, the higher light intensity may cause the curing speed to be too fast, resulting in coating shrinkage, deformation or surface defects. Therefore, the light intensity needs to be adjusted according to the initiator concentration to ensure that the coating can be cured evenly and thoroughly.

[0022] In some further preferred embodiments, when the weight percentage of the photoinitiator is 0.1%, the light wave intensity is 500-700 mW / cm², and the irradiation time is 30-60 seconds; when the weight percentage of the photoinitiator is 0.5%, the light wave intensity is 300-500 mW / cm², and the irradiation time is 20-40 seconds; when the weight percentage of the photoinitiator is 1%, the light wave intensity is 100-300mW / cm², and the irradiation time is 10-20 seconds. It should be noted that when the concentration of the photoinitiator is 0.1%, the amount of initiator is small and the efficiency of absorbing light energy is relatively low. In order to ensure sufficient curing, it is necessary to increase the light wave intensity and extend the irradiation time to provide more energy to activate the photoinitiator and fully initiate the polymerization reaction. Low concentration of photoinitiator may lead to insufficient initiation of the curing reaction, especially in areas with thick coatings or complex textures. Higher light wave intensity ensures that the initiator can absorb enough light energy, and longer irradiation time ensures that the initiator can continue to work to prevent insufficient curing. When the photoinitiator concentration is 0.5%, the initiator concentration in the coating is moderate, which can absorb light energy and initiate polymerization reaction more efficiently. In this case, the light wave intensity and irradiation time can be kept at a moderate level, which can not only cure the coating quickly, but also avoid the problem of local over-curing caused by excessive consumption of initiator. Moderate intensity light waves and moderate irradiation time can provide enough energy for the coating to ensure uniform and efficient curing. Moderate lighting conditions can ensure the curing effect without causing too fast curing to cause shrinkage or deformation of the coating. When the photoinitiator concentration is 1%, there are enough initiators in the coating to quickly absorb light energy and start the curing reaction. In this case, it is necessary to reduce the light wave intensity and shorten the irradiation time to avoid excessive reaction, resulting in too fast curing, film shrinkage, uneven surface hardening and other problems. Too high a photoinitiator concentration and strong light conditions may lead to over-curing, especially in the case of thicker coatings, where the surface cures too quickly and the interior cures insufficiently. By reducing the light wave intensity and reducing the irradiation time, the curing process of the coating can be ensured to be more uniform, and the cracking or deformation of the coating caused by over-curing can be prevented. It is understandable that when the photoinitiator concentration is low (0.1%), it is necessary to increase the light wave intensity and extend the irradiation time to ensure sufficient curing reaction; when the concentration is moderate (0.5%), moderate light wave intensity and time can ensure efficient and uniform curing; and when the photoinitiator concentration is high (1%), it is necessary to reduce the light wave intensity and shorten the irradiation time to avoid over-curing or coating defects. This automatic adjustment mechanism in this embodiment can ensure the curing effect of the coating under different formulations, improve the flexibility of the process and the stability of product quality.

[0023] In some preferred embodiments, when the sub-film texture coating is cured, an LED cold light curing device is used to irradiate the sub-film texture coating applied on the texture mother film, so that the sub-film texture coating is cured to form the texture sub-film. It should be noted that the LED cold light curing device generates less heat than traditional UV lamps or high-temperature curing devices. When curing the sub-film texture coating, excessively high temperatures will affect the already formed texture mother film and sub-film coating, causing deformation, shrinkage or surface defects of the film layer. Using LED cold light curing can reduce thermal damage to the mother film and sub-film, ensuring the stability and uniformity of the coating structure.

[0024] In some preferred embodiments, when the textured sub-film is bonded to the substrate of the electrical device housing, a mercury lamp curing device is used to irradiate the textured sub-film so that the textured sub-film is bonded to the substrate of the electrical device housing. It should be noted that the mercury lamp curing device can provide ultraviolet rays with a higher energy density, especially with a strong irradiation ability in the UV-C band. For scenarios where high-intensity curing needs to be achieved in a short time, the mercury lamp can provide sufficient energy to ensure that the textured sub-film is quickly and fully cured when it is bonded to the substrate. Compared with LED curing devices, mercury lamps can cure coatings more quickly. The high energy output of the mercury lamp can penetrate deeply between the sub-film and the substrate to achieve deep curing, which can improve the bonding strength of the coating and ensure that the cured sub-film has excellent physical properties, such as wear resistance, corrosion resistance and high temperature resistance.

[0025] For the above embodiments, it can be understood that the curing of the parent film texture forming coating and the curing of the sub-film texture coating adopts an LED cold light curing device, which can reduce the thermal damage to the parent film and the sub-film while obtaining the texture parent film and the texture sub-film respectively, ensure the stability and uniformity of the coating structure, and save energy. When the texture sub-film is bonded to the substrate of the electrical equipment housing, a mercury lamp curing device is used to irradiate the texture sub-film so that the texture sub-film is bonded to the substrate of the electrical equipment housing, which can cure the coating more quickly, achieve deep curing, improve the bonding strength of the coating, and ensure that the cured sub-film has excellent physical properties, such as wear resistance, corrosion resistance, and high temperature resistance.

[0026] Embodiment 2 See also Figure 1 This embodiment provides a mother film texture forming coating, the mother film texture forming coating comprises: 20-30% by weight of polyurethane UV2 functional resin, 40-60% by weight of silicon modified acrylate resin, 10-20% by weight of polycarbonate modified resin, 2-10% by weight of hexanediol diacrylate and 0.1-1% by weight of photoinitiator. When producing the mother film texture forming coating, the following specific implementation can be adopted.

[0027] In the first embodiment, the mother film texture forming coating comprises: 25% by weight of polyurethane UV2 resin, 55% by weight of silicon-modified acrylate resin, 15% by weight of polycarbonate modified resin, 4% by weight of hexanediol diacrylate and 1% by weight of photoinitiator. After the weight percentage is selected, the hexanediol diacrylate and the photoinitiator are stirred and mixed, and the polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 resin are added in sequence and stirred, and deaerated to obtain the mother film texture forming coating. In the first embodiment, the test sample of the mother film texture forming coating has the following characteristics. The tensile strength is 71-81 MPa, the tensile elastic modulus is 3100-4100 MPa, and the elongation at break is 3.2-6.2%, indicating that the material has good toughness, the flexural strength is maintained at 132-152 MPa, the flexural elastic modulus ranges from 3050-4050 MPa, the impact strength is 11-21 kJ / m², and the glass transition temperature is 91-111°C. Among them, the content of polyurethane UV2 functional resin is moderate (25%), which can ensure good elasticity and strength; the silicon-modified acrylate resin (55%) improves weather resistance and impact resistance; the high proportion of photoinitiator (1%) promotes curing efficiency, and the material performance is balanced.

[0028] In Embodiment 2, the mother film texture forming coating comprises: 20% by weight of polyurethane UV2 resin, 60% by weight of silicon-modified acrylate resin, 10% by weight of polycarbonate modified resin, 9.9% by weight of hexanediol diacrylate and 0.1% by weight of photoinitiator. After the weight percentage is selected, the hexanediol diacrylate and the photoinitiator are stirred and mixed, and the polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 resin are added in sequence and stirred, and deaerated to obtain the mother film texture forming coating. In Embodiment 2, the test sample of the mother film texture forming coating has the following characteristics. The tensile strength is 70-80MPa, the tensile elastic modulus is 3000-4000 MPa, the elongation at break is 3.0-5.9%, the flexural strength ranges from 130-150 MPa, the flexural elastic modulus is 3000-4000 MPa, the impact strength is 10.9-20.9 kJ / m², and the glass transition temperature is 90-110℃. Among them, the proportion of polyurethane UV2 functional resin is 20%, and the elasticity and toughness are slightly reduced; the content of silicon-modified acrylate resin is 60%, making the material more rigid; the proportion of photoinitiator is 0.1%, and the curing efficiency is slightly affected.

[0029] Embodiment 3, the mother film texture forming coating comprises: 30% by weight of polyurethane UV2 resin, 50% by weight of silicon-modified acrylate resin, 15% by weight of polycarbonate modified resin, 4.5% by weight of hexanediol diacrylate and 0.5% by weight of photoinitiator. After the weight percentage is selected, the hexanediol diacrylate and the photoinitiator are stirred and mixed, and the polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 resin are added in sequence and stirred, and degassed to obtain the mother film texture forming coating. In embodiment 3, the test sample of the mother film texture forming coating has the following characteristics. The tensile strength is 72-82 MPa, the tensile elastic modulus is 3150-4150 MPa, the elongation at break is 3.3-6.3%, the bending strength ranges from 134-154 MPa, and the bending elastic modulus is 3075-4075 MPa. The impact strength is 12-22 kJ / m², and the glass transition temperature is 92-112℃. Among them, the polyurethane UV2 functional resin is 30%, which significantly improves the strength and toughness of the material; the proportion of silicon-modified acrylate resin is 50%, which enhances the elastic balance; the photoinitiator is 0.5%, which is a moderate proportion, with a stable curing rate and balanced performance.

[0030] Embodiment 4, the mother film texture forming coating comprises: 30% by weight of polyurethane UV2 functional resin, 40% by weight of silicon-modified acrylate resin, 20% by weight of polycarbonate modified resin, 9% by weight of hexanediol diacrylate and 1% by weight of photoinitiator. After the weight percentage is selected, the hexanediol diacrylate and the photoinitiator are stirred and mixed, and the polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 functional resin are added in sequence and stirred, and deaerated to obtain the mother film texture forming coating. In embodiment 4, the test sample of the mother film texture forming coating has the following characteristics. The tensile strength is 71-81MPa, the tensile elastic modulus is 3120-4120MPa, the elongation at break is 3.1-6.1%, the flexural strength is 133-153MPa, the flexural elastic modulus is 3060-4060MPa, the impact strength ranges from 11.5-21.5 kJ / m², and the glass transition temperature is 91.5-111.5℃. Among them, the proportion of polycarbonate modified resin is relatively high (20%), which enhances toughness and impact resistance; the proportion of silicon-modified acrylate resin is 40%, which maintains stable strength; the proportion of hexanediol diacrylate is 9%, which provides good flexibility and film-forming properties.

[0031] Embodiment 5, the mother film texture forming coating comprises: 30% by weight of polyurethane UV2 functional resin, 40% by weight of silicon-modified acrylate resin, 19.4% by weight of polycarbonate modified resin, 10% by weight of hexanediol diacrylate and 0.6% by weight of photoinitiator. After the weight percentage is selected, the hexanediol diacrylate and the photoinitiator are stirred and mixed, and the polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 functional resin are added in sequence and stirred, and deaerated to obtain the mother film texture forming coating. In embodiment 5, the test sample of the mother film texture forming coating has the following characteristics. The tensile strength is 72-82 MPa, the tensile elastic modulus is 3180-4180 MPa, the elongation at break is in the range of 3.4-6.4%, the flexural strength is 135-155 MPa, the flexural elastic modulus is 3090-4090 MPa, the impact strength is 12.5-22.5 kJ / m², and the glass transition temperature is 93-113°C. Among them, the proportion of polyurethane UV2 functional resin and silicon-modified acrylate resin is balanced (both 30% and 40%) to ensure strength and weather resistance; the proportion of hexanediol diacrylate is relatively high (10%) to improve flexibility and ductility; the photoinitiator is moderate (0.6%), and the curing performance is efficient.

[0032] In general, in the above embodiments, a high proportion of silicon-modified acrylate resin can increase the rigidity of the material, a high proportion of polyurethane UV2 resin can improve flexibility and toughness, a high proportion of hexanediol diacrylate can improve the film-forming effect, and the proportion of photoinitiator is moderate, so the curing efficiency can be improved. The mother film texture forming coating contains a photoinitiator (0.1-1%), and the resin is cured by ultraviolet light without the use of solvents, which significantly reduces VOC emissions. The UV curing system has almost no organic matter volatilized during the curing process, which meets environmental protection requirements, and can also accelerate the curing process and improve production efficiency. Silicon-modified acrylate resin is a silicone-modified acrylic resin. This type of resin has advantages in reducing VOC emissions because they have a high crosslinking density and solid content, can provide excellent coating properties, and reduce the use of solvents. Silicon-modified acrylic resins also have good weather resistance, chemical resistance and stain resistance, and are suitable for decorative coatings, especially in applications such as mobile phones, tablets and automotive interiors that have high requirements for appearance. Polyurethane UV2 resins and polycarbonate modified resins also have the characteristics of low VOC emissions. Polyurethane UV resins are usually high-solid or solvent-free, and can quickly form high-quality coatings through UV curing, reducing the amount of solvent used. Similarly, polycarbonate modified resins, with their good mechanical properties and environmental characteristics, further reduce the emission of volatile organic compounds.

[0033] It should also be noted that polyurethane UV2 official resin has excellent elasticity and flexibility. The molecular structure of polyurethane contains soft segments and hard segments, which can provide good stretchability and wear resistance, so that the coating will not easily break when stretched, thereby ensuring that the parent film texture forming coating has good flexibility. Polycarbonate modified resin is an engineering plastic with high strength and high toughness. By modifying and adding it to the coating, it can not only enhance the mechanical strength of the coating, but also improve its ductility. The good toughness of polycarbonate enables the coating to deform to a certain extent when subjected to external force without damaging the coating, helping to improve the tensile properties of the parent film. Silicon-modified acrylate resin has good flexibility and low modulus, which can improve the tensile properties of the coating. Hexanediol diacrylate is an active diluent that can improve the fluidity and flexibility of the coating. It can not only reduce the viscosity of the coating and facilitate coating, but also improve the toughness of the coating during the curing process, so that the parent film has good tensile properties, which is helpful for subsequent texture treatment.

[0034] Embodiment 3 See also Figure 1 This embodiment provides a method for preparing a mother film texture forming coating, comprising the following steps: S101, stirring and mixing hexanediol diacrylate and a photoinitiator to obtain a first mixture; S102, adding polycarbonate modified resin, silicon modified acrylate resin and polyurethane UV2 functional resin to the first mixture in sequence and stirring to obtain a second mixture; S103, performing a degassing treatment on the second mixture to obtain the mother film texture forming coating.

[0035] It should be noted that in step S101, hexanediol diacrylate and photoinitiator are mixed. Hexanediol diacrylate is a low-viscosity liquid with a bifunctional group, which is easy to mix evenly with the photoinitiator. By stirring, the photoinitiator is ensured to be evenly distributed throughout the coating. This ensures that in the subsequent photocuring process, the photoinitiator can play a role in every part of the coating and ensure the uniformity of the curing reaction. Before the photoinitiator is mixed with other components, it is mixed with low-viscosity hexanediol diacrylate, which helps to avoid premature reaction due to excessive local concentration when mixing other components. In addition, hexanediol diacrylate itself has good fluidity. As a solvent or dispersion medium in the initial stage of the reaction, it can reduce the viscosity of the system and facilitate the uniform dispersion of the initiator. In step S102, polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 functional resin are added in sequence and stirred. Polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 functional resin are the main components of the master film texture forming coating, and each component has different physical and chemical properties. Adding and stirring in sequence can avoid the problem of sudden increase in viscosity or uneven composition. Polycarbonate modified resin is relatively soft and easier to mix with the first mixture, while silicon-modified acrylate resin and polyurethane UV2 resin are gradually mixed thereafter to ensure that the overall system viscosity is moderate and easy to stir evenly. When these ingredients are gradually added, the viscosity change of the system can be effectively controlled to avoid uneven mixing caused by adding high-viscosity materials at one time or causing uneven local distribution of materials. By adding in sequence, the mixing is more sufficient and the dispersion of the resin is better. In step S103, it is considered that air may be introduced into the mixture during the previous stirring process to produce bubbles. The presence of bubbles will cause the mechanical properties of the coating to decrease, such as reducing the adhesion strength and affecting the uniformity of the structure after curing. By degassing, the uniformity and stability of the coating can be improved, the performance of the final coating can be improved, and the integrity and durability of the texture mother film can be ensured.

[0036] It is understood that the first mixture refers to a mixture of hexanediol diacrylate and a photoinitiator. Hexanediol diacrylate has a low viscosity, so the first mixture behaves as a low-viscosity liquid, which helps the photoinitiator to be evenly distributed throughout the coating and ensures subsequent uniform curing. Due to the low viscosity, the first mixture has good fluidity, is easy to mix and disperse, and can well wrap and transfer the photoinitiator. In addition, hexanediol diacrylate is an active monomer containing a diacrylate group, which can undergo a cross-linking reaction with the resin added later, and form a solid structure through a photocuring reaction under the action of a photoinitiator. Its bifunctional group can participate in the cross-linking of the resin and improve the cross-linking density and strength of the final coating. Since hexanediol diacrylate is a good solvent, the photoinitiator can be evenly dissolved or dispersed therein to ensure the uniformity of the reaction during curing. The second mixture refers to a mixture after adding polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 functional resin to the first mixture. With the addition of polymer resins (such as polycarbonate modified resins and silicon modified acrylate resins), the viscosity of the second mixture gradually increases and becomes a medium or high viscosity liquid. Higher viscosity helps to improve the film-forming property of the coating, ensuring that it can be well coated on the mold surface and form a uniform film layer. Polycarbonate modified resins and silicon modified acrylate resins can enhance the toughness, weather resistance and anti-yellowing properties of the coating, so that the coating formed by the second mixture after curing has excellent mechanical properties and long-term stability. In addition, the resin components in the second mixture (such as polyurethane UV2 functional resins and silicon modified acrylate resins) are the main film-forming materials and have photocuring reaction activity. Under the action of photoinitiators, the acrylic groups of these resins can participate in the photocuring cross-linking reaction to form a dense network structure, thereby improving the strength and durability of the coating. Polycarbonate modified resins provide higher toughness and impact resistance, silicon modified acrylate resins improve the weather resistance and chemical corrosion resistance of the coating, and polyurethane UV2 functional resins provide good mechanical properties and transparency. The mixture of these resins gives the coating a variety of properties, such as high strength, wear resistance, and UV resistance.

[0037] It should be noted that the parent film texture forming coating contains a photoinitiator (0.1-1%), and the resin is cured by ultraviolet light without the use of solvents, which significantly reduces VOC emissions. The UV curing system emits almost no organic matter during the curing process, which meets environmental protection requirements, and can also accelerate the curing process and improve production efficiency. Silicon-modified acrylic resin is a silicone-modified acrylic resin. This type of resin has advantages in reducing VOC emissions because they have a high crosslinking density and solid content, can provide excellent coating properties, and reduce the use of solvents. Silicon-modified acrylic resins also have good weather resistance, chemical resistance and stain resistance, and are suitable for use in decorative coatings, especially in applications such as mobile phones, tablets and automotive interiors that have high requirements for appearance. Polyurethane UV2 official resins and polycarbonate modified resins also have the characteristics of low VOC emissions. Polyurethane UV resins are usually high-solid content or solvent-free, and can quickly form high-quality coatings through UV curing, reducing the use of solvents. Similarly, polycarbonate modified resins further reduce the emission of organic volatiles with their good mechanical properties and environmental characteristics.

[0038] It should also be noted that polyurethane UV2 official resin has excellent elasticity and flexibility. The molecular structure of polyurethane contains soft segments and hard segments, which can provide good stretchability and wear resistance, so that the coating will not easily break when stretched, thereby ensuring that the parent film texture forming coating has good flexibility. Polycarbonate modified resin is an engineering plastic with high strength and high toughness. By modifying and adding it to the coating, it can not only enhance the mechanical strength of the coating, but also improve its ductility. The good toughness of polycarbonate enables the coating to deform to a certain extent when subjected to external force without damaging the coating, helping to improve the tensile properties of the parent film. Silicon-modified acrylate resin has good flexibility and low modulus, which can improve the tensile properties of the coating. Hexanediol diacrylate is an active diluent that can improve the fluidity and flexibility of the coating. It can not only reduce the viscosity of the coating and facilitate coating, but also improve the toughness of the coating during the curing process, so that the parent film has good tensile properties, which is helpful for subsequent texture treatment.

[0039] In some preferred embodiments, when hexanediol diacrylate and photoinitiator are stirred and mixed, the stirring speed is 1000 rpm and the stirring time is 10 minutes; when polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 functional resin are added to the first mixture in sequence and stirred, the stirring speed is 1200 rpm and the stirring time is 15 minutes; when the second mixture is degassed, the degassed time is 30 minutes.

[0040] It should be noted that the main function of the photoinitiator is to stimulate the reaction through ultraviolet or LED light, so its uniform dispersion throughout the coating is crucial. The moderate stirring speed of 1000 rpm can effectively promote the uniform dispersion of the photoinitiator in the low-viscosity hexanediol diacrylate without causing excessive bubble formation or local deposition. Hexanediol diacrylate itself is a low-viscosity liquid, and a stirring time of 10 minutes is sufficient to ensure that the photoinitiator is completely and evenly mixed into the liquid. Due to the low viscosity, a longer stirring time is not necessary. 10 minutes of stirring can ensure that the photoinitiator is evenly distributed in the coating, avoiding local excessive concentration or insufficient mixing due to too short a time. Stirring for a longer time or at a higher speed may introduce a large number of bubbles, especially in low-viscosity liquids. Therefore, controlling the speed at 1000 rpm can minimize the generation of bubbles while ensuring sufficient mixing, reducing the difficulty of subsequent degassing. In addition, after adding polycarbonate modified resin, silicon-modified acrylate resin and polyurethane UV2 functional resin, the viscosity of the mixed system will increase significantly. These polymer resins have high molecular weight and viscosity. The high stirring speed of 1200 rpm helps to overcome the mixing difficulty caused by the increased viscosity and ensure that the components can be fully mixed to form a uniform second mixture. Add the resins and stir in sequence to avoid adding too much high-viscosity material at one time, which will cause uneven stirring. The stirring time of 15 minutes can ensure that the resin components are gradually and evenly dispersed, so that the final mixture has ideal fluidity and uniformity. The setting of stirring time and speed ensures that all resins can be fully contacted and mixed, avoiding film formation defects or uneven curing caused by insufficient local mixing. At the same time, the active functional groups in the resin also need to be evenly distributed so that the subsequent photoinitiator can effectively trigger the cross-linking reaction during the curing process. The system with higher viscosity is easy to stir into air at a speed of 1200 rpm. Therefore, the stirring time is set to 15 minutes, which can ensure the uniformity of the mixture without excessively extending the time to avoid introducing too many bubbles. Bubbles are inevitably introduced during the stirring process, especially in the second mixture with higher viscosity. Bubbles may affect the uniformity and mechanical properties of the coating. The setting of the degassing treatment time is to ensure that the bubbles are completely removed. The 30-minute vacuum degassing time is long enough to remove most of the bubbles from the mixture and ensure the uniformity of the coating. If the bubbles are not completely removed, pores or bubble marks may appear in the coating after curing, affecting the surface flatness, optical effects and mechanical properties. Through the 30-minute degassing treatment, most of the bubbles can be eliminated, ensuring the quality of the texture mother film and the integrity of the final decorative effect. With the appropriate degassing time, the mixture can maintain stable fluidity and uniformity before curing, which helps the subsequent coating and curing process to proceed smoothly.

[0041] In some further preferred embodiments, during the stirring process, the viscosity change of the mixture is monitored by a viscosity sensor, and when the mixture reaches a preset viscosity range, the stirring time and stirring speed of the stirrer are automatically adjusted; the viscosity sensor is a rotary viscosity sensor, and the rotary viscosity sensor is installed at the bottom of the stirrer, and the probe of the rotary viscosity sensor is in direct contact with the mixture. It should be noted that although standard parameters are set for the stirring time and stirring speed, in actual applications, different batches of raw materials may have differences in viscosity and mixing difficulty. By real-time monitoring of viscosity and automatically adjusting the stirring time, uniform mixing of initiator and epoxy resin can be ensured, avoiding the inconsistency problem caused by insufficient artificial setting of time or excessive stirring. By automatically adjusting the stirring time, the waiting time in the preparation process can be shortened, the overall efficiency of the production line can be improved, and unnecessary excessive stirring can be avoided.

[0042] In some further preferred embodiments, the vacuum degassing device includes a bubble detection sensor. After the stirrer completes the stirring according to the automatically adjusted stirring speed and stirring time, the bubble detection sensor monitors the number and size of bubbles in the entire solidified coating in real time. When the bubbles are completely eliminated or the set minimum residual bubble level is reached, the vacuum degassing device automatically stops the degassing process. It should be noted that the fixed setting of the degassing time may cause some coatings to end degassing before the bubbles are completely removed, or the bubbles have been eliminated but the unnecessary time is still extended. Through the bubble detection sensor, the vacuum degassing device can intelligently determine the end point of the degassing process, ensure that the bubbles are completely removed, and ensure the uniformity and quality of the coating. Long-term vacuum degassing may cause the properties of some materials to change or excessive water loss, affecting their final performance. By monitoring the bubble state in real time, the damage to the coating performance caused by long-term degassing can be avoided, and the physical properties and structural integrity of the coating can be ensured. It should be noted that in this embodiment, the bubble detection sensor starts working after the stirring is completed, which can save resources and computing power. In this way, the vacuum degassing device only needs to accurately monitor the bubbles in the critical vacuum degassing stage to avoid wasting unnecessary monitoring work during stirring. This improves the efficiency of the equipment while focusing on the critical quality control link in the degassing process. During the stirring process, the bubbles that the sensor may detect are only temporary due to mechanical stirring, and they may dissipate naturally during subsequent mixing or static processing. Therefore, bubble detection during stirring may cause false alarms or misjudgments. Monitoring after stirring is more accurate and can effectively monitor the bubbles remaining in the mixture and degas these bubbles.

[0043] It should be pointed out that the above embodiments are only preferred specific implementation modes of the present invention, and the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. The protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An electrical equipment housing having a decorative effect, wherein a parent film texture forming coating is used to form the decorative effect, characterized in that: The mother film texture forming coating comprises: 20-30% by weight of polyurethane UV2 functional resin, 40-60% by weight of silicon modified acrylate resin, 10-20% by weight of polycarbonate modified resin, 2-10% by weight of hexanediol diacrylate and 0.1-1% by weight of photoinitiator.

2. The electrical equipment housing according to claim 1, characterized in that: The mother film texture forming coating is applied on a mold with a texture and solidified to form a texture mother film, and a sub-film texture coating is applied on the texture mother film. The sub-film texture coating is solidified to form a texture sub-film with a decorative effect. The texture sub-film is bonded to the substrate of the electrical equipment casing to obtain an electrical equipment casing with a decorative effect.

3. The electrical equipment housing according to claim 2, characterized in that: When the master film texture forming paint is applied on a mold with a texture and cured, an LED cold light curing device is used to irradiate the master film texture forming paint applied on the mold, so that the master film texture forming paint is cured to form the texture master film.

4. The electrical equipment housing according to claim 2, characterized in that: When the sub-film texture coating is cured, an LED cold light curing device is used to irradiate the sub-film texture coating applied on the texture mother film, so that the sub-film texture coating is cured to form the texture sub-film.

5. The electrical equipment housing according to claim 2, characterized in that: When the texture sub-film is bonded to the substrate of the electrical device housing, a mercury lamp curing device is used to irradiate the texture sub-film so that the texture sub-film is bonded to the substrate of the electrical device housing.

6. A parent film texture forming coating, characterized in that: include: 20-30% by weight of polyurethane UV2 functional resin, 40-60% by weight of silicon-modified acrylate resin, 10-20% by weight of polycarbonate modified resin, 2-10% by weight of hexanediol diacrylate and 0.1-1% by weight of photoinitiator.

7. A method for preparing a mother film texture forming coating, characterized in that: include: Stirring and mixing hexanediol diacrylate and a photoinitiator to obtain a first mixture; Adding polycarbonate modified resin, silicon modified acrylate resin and polyurethane UV2 functional resin to the first mixture in sequence and stirring to obtain a second mixture; The second mixture is subjected to a degassing treatment to obtain the mother film texture forming coating.

8. The method for preparing an electrical equipment housing according to claim 7, characterized in that: The weight percentage of the polyurethane UV2 functional resin is 20%, the weight percentage of the silicon-modified acrylate resin is 60%, the weight percentage of the polycarbonate modified resin is 10%, the weight percentage of the hexanediol diacrylate is 9.9%, and the weight percentage of the photoinitiator is 0.1%.

9. The method for preparing an electrical equipment housing according to claim 7, characterized in that: The weight percentage of the polyurethane UV2 functional resin is 25%, the weight percentage of the silicon-modified acrylate resin is 55%, the weight percentage of the polycarbonate modified resin is 15%, the weight percentage of the hexanediol diacrylate is 4%, and the weight percentage of the photoinitiator is 1%.

10. The method for preparing an electrical equipment housing according to claim 7, characterized in that: When hexanediol diacrylate and photoinitiator are stirred and mixed, the stirring speed is 1000 rpm and the stirring time is 10 minutes; when polycarbonate modified resin, silicon modified acrylate resin and polyurethane UV2 functional resin are added to the first mixture in sequence and stirred, the stirring speed is 1200 rpm and the stirring time is 15 minutes; when the second mixture is degassed, the degassed time is 30 minutes.

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