Antistatic coating for electric appliance

Abstract

The invention belongs to the technical field of electrics, and particularly relates to an antistatic coating for an electric appliance. The antistatic coating for the electric appliance comprises the following raw materials in parts by mass: 70-80 parts of a water-based acrylic emulsion, 35-45 parts of a composite antistatic filler, 1-2 parts of an inorganic filler, 2-4 parts of a coalescing agent and 20-30 parts of water, and the composite antistatic filler is composed of a composite conductive filler and an antistatic agent in a mass ratio of (2-3): 1; the composite conductive filler comprises nanoscale carbon black, graphite and zinc oxide in a mass ratio of (3-4): (3-4): 1; the antistatic agent is fatty glyceride. Static accumulation can be effectively prevented, and electrical equipment such as a distribution box and the like is protected from being damaged by static electricity; on the basis of keeping the original excellent performance of the coating, the antistatic ability of the coating is remarkably improved, and the overall stability and durability of the coating are not affected.

Description

Technical Field

[0001] The invention belongs to the field of electrical technology, and in particular relates to an antistatic coating for electrical appliances. Background Art

[0002] In the power system, the distribution box is the core equipment for power distribution and control, and its safety and stability are of vital importance. The coating on the surface of the distribution box can protect the equipment from environmental damage, improve the aesthetics and specific functionality, and has multiple performance requirements depending on the application scenario. Distribution boxes are usually installed in various environments, including factory workshops, commercial buildings, and even outdoors. The surface is susceptible to physical effects such as mechanical friction, scratches, and accidental impacts. Therefore, the coating must have good wear resistance to resist daily wear and maintain the integrity and aesthetics of the coating; fire is one of the main risks faced by electrical equipment. As the center of power distribution, once a fire occurs in the distribution box, it will spread rapidly and may cause serious consequences.

[0003] At present, in response to the above problems, wear-resistant and fire-retardant coatings have been widely used. Wear-resistant coatings use high-hardness and high-strength resin base materials and add wear-resistant fillers such as aluminum oxide and silicon carbide to improve the wear resistance of the coating; fire-retardant coatings form a flame-retardant layer to slow down the spread of flames and reduce the efficiency of heat transfer, providing valuable time for the initial extinguishing of fires. At the same time, some fire-retardant coatings are also self-extinguishing and can extinguish themselves after the fire source leaves, further improving the safety of the distribution box.

[0004] In certain environments, such as dry or dusty places, electrical equipment such as distribution boxes are prone to accumulate static electricity. Static electricity may not only cause the risk of electric shock, but may also damage the electronic components inside the equipment, affecting the normal operation of the equipment. The antistatic property of coatings is generally achieved through antistatic agents, which are added to the coating and form a conductive path in the coating to conduct the charge in time. However, these antistatic agents with conductive functions often affect other properties of the coating. For example, adding metal powder will reduce the corrosion resistance of the coating, and organic antistatic agents may cause the coating surface to become too smooth, reducing the adhesion and wear resistance of the coating. In addition, antistatic agents may also react chemically with other components in the coating, affecting the stability and durability of the coating. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an antistatic coating for electrical appliances, which can effectively prevent static electricity accumulation and protect electrical equipment such as distribution boxes from static electricity damage; on the basis of maintaining the original excellent performance of the coating, its antistatic ability is significantly improved without affecting the overall stability and durability of the coating.

[0006] The antistatic coating for electrical appliances of the present invention comprises the following raw materials in parts by weight:

[0007] 70-80 parts of water-based acrylic emulsion,

[0008] 35-45 parts of composite antistatic filler,

[0009] 1-2 parts of inorganic filler,

[0010] 2-4 parts of film-forming aid,

[0011] 20-30 parts water,

[0012] The composite antistatic filler is composed of a composite conductive filler and an antistatic agent in a mass ratio of (2-3):1; the composite conductive filler includes nano-scale carbon black, graphite and zinc oxide in a mass ratio of (3-4):(3-4):1; and the antistatic agent is fatty acid glyceride.

[0013] Preferably, the solid content of the aqueous acrylic emulsion is 33%-35%.

[0014] Preferably, the inorganic filler is one or both of silicon dioxide and aluminum oxide.

[0015] Preferably, the film-forming aid is propylene glycol.

[0016] Preferably, the preparation method of the composite filler is: nano-scale carbon black, graphite and zinc oxide are mixed with ethanol to form a suspension with a solid content of 15%-20%, ball milled with a planetary ball mill for 8-10 hours, an antistatic agent is added and ball milled for 8-10 hours, and then a silane coupling agent is added and ball milled for 10-12 hours, and the composite filler is obtained after drying.

[0017] Preferably, the silane coupling agent is one of KH-550 and KH-560.

[0018] Preferably, the added amount of the silane coupling agent is 0.5%-1.5% of the total mass of the nano-scale carbon black, graphite and zinc oxide.

[0019] Preferably, the drying temperature is 80-100°C.

[0020] The preparation method of the antistatic coating for electrical appliances of the present invention comprises the following steps: mixing and stirring an aqueous acrylic emulsion and a composite antistatic filler for 1-2 hours, adding 1 / 2 of the formula amount of water, then adding an inorganic filler and a film-forming aid and stirring for 0.5-1 hour, and finally adding the remaining water in the formula amount and stirring for 1-1.5 hours to obtain the antistatic coating for electrical appliances, and spraying or brushing the coating on the surface of the electrical appliance housing and drying the coating.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention adopts high-hardness and high-strength water-based acrylic resin as the film-forming matrix, which has good wear resistance and weather resistance, and can meet the use requirements of the distribution box in different environments; nano-scale carbon black, graphite and zinc oxide are used as composite conductive fillers to form a uniform conductive network in the coating, effectively conduct static electricity, and avoid the corrosion resistance problem caused by metal powder;

[0023] 2. The present invention adds a specific type of organic antistatic agent fatty acid glyceride, which, although it cannot be dissociated into ions, has good thermal stability and processing performance and has no harmful effect on polymer materials;

[0024] 3. The composite conductive filler and antistatic agent are further homogenized by ball milling and treated with silane coupling agent, which improves the uniformity of dispersion. At the same time, the powdered material treated with silane coupling agent improves its compatibility with the film-forming matrix, which can significantly improve the antistatic performance of the coating without affecting the adhesion and wear resistance of the coating. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with embodiments.

[0026] All raw materials used in the examples are commercially available unless otherwise specified. Among them, the water-based acrylic emulsion is produced by BASF Co., Ltd. and has a solid content of 35%.

[0027] Example 1

[0028] (1) 30 g of nano-carbon black, 30 g of graphite and 10 g of zinc oxide were mixed with ethanol to form a suspension with a solid content of 15%, and after ball milling in a planetary ball mill at a ball-to-material ratio of 1:2 for 8 h, 35 g of antistatic agent fatty acid glyceride was added and ball milling was continued for 8 h, and then 0.7 g of silane coupling agent KH-550 was added and ball milling was continued for 10 h, and a composite antistatic filler was obtained after drying;

[0029] (2) 70 g of water-based acrylic emulsion and 35 g of composite antistatic filler were put into a mixing kettle and stirred for 1 h, 10 g of water was added, and then 1 g of inorganic filler silica and 2 g of film-forming aid propylene glycol were added and stirred for 0.5 h, and finally 10 g of water was added and stirred for 1 h.

[0030] Example 2

[0031] (1) 40 g of nano-scale carbon black, 40 g of graphite and 10 g of zinc oxide were mixed with ethanol to form a suspension with a solid content of 20%, and after ball milling in a planetary ball mill at a ball-to-material ratio of 1:2 for 10 h, 30 g of antistatic agent fatty acid glyceride was added and ball milling was continued for 10 h, and then 0.45 g of silane coupling agent KH-560 was added and ball milling was continued for 12 h, and a composite antistatic filler was obtained after drying;

[0032] (2) 80 g of water-based acrylic emulsion and 45 g of composite antistatic filler were put into a mixing kettle and stirred for 2 h, 15 g of water was added, and then 2 g of inorganic filler alumina and 4 g of film-forming aid propylene glycol were added and stirred for 1 h, and finally 15 g of water was added and stirred for 1.5 h.

[0033] Example 3

[0034] (1) 30 g of nano-carbon black, 40 g of graphite and 10 g of zinc oxide were mixed with ethanol to form a suspension with a solid content of 18%, and after ball milling in a planetary ball mill at a ball-to-material ratio of 1:2 for 9 h, 40 g of antistatic agent fatty acid glyceride was added and ball milling was continued for 9 h, and then 0.8 g of silane coupling agent KH-550 was added and ball milling was continued for 11 h, and a composite antistatic filler was obtained after drying;

[0035] (2) 75 g of water-based acrylic emulsion and 40 g of composite antistatic filler were put into a mixing kettle and stirred for 1 h, 12.5 g of water was added, and then 1.5 g of inorganic filler silica and 2.5 g of film-forming aid propylene glycol were added and stirred for 1 h, and finally 12.5 g of water was added and stirred for 1 h.

[0036] Example 4

[0037] (1) 40 g of nano-carbon black, 30 g of graphite and 10 g of zinc oxide were mixed with ethanol to form a suspension with a solid content of 20%, and after ball milling in a planetary ball mill at a ball-to-material ratio of 1:2 for 8 h, 40 g of antistatic agent fatty acid glyceride was added and ball milling was continued for 8 h, and then 0.64 g of silane coupling agent KH-550 was added and ball milling was continued for 10 h, and a composite antistatic filler was obtained after drying;

[0038] (2) 80 g of water-based acrylic emulsion and 35 g of composite antistatic filler were put into a mixing kettle and stirred for 1 h, 10 g of water was added, and then 2 g of inorganic filler alumina and 2 g of film-forming aid propylene glycol were added and stirred for 0.5 h, and finally 10 g of water was added and stirred for 1.5 h.

[0039] Comparative Example 1

[0040] (1) 30 g of nano-carbon black, 30 g of graphite and 10 g of zinc oxide were mixed with ethanol to form a suspension with a solid content of 15%, and the mixture was ball-milled in a planetary ball mill at a ball-to-material ratio of 1:2 for 8 h, and then 35 g of an antistatic agent, fatty acid glyceride, was added and ball-milled for another 8 h, and a composite antistatic filler was obtained after drying;

[0041] (2) 70 g of water-based acrylic emulsion and 35 g of composite antistatic filler were put into a mixing kettle and stirred for 1 h, 10 g of water was added, and then 1 g of inorganic filler silica and 2 g of film-forming aid propylene glycol were added and stirred for 0.5 h, and finally 10 g of water was added and stirred for 1 h.

[0042] Comparative Example 2

[0043] (1) 30 g of nano-carbon black, 30 g of graphite and 10 g of zinc oxide were mixed with ethanol to form a suspension with a solid content of 15%, and the mixture was ball-milled in a planetary ball mill at a ball-to-material ratio of 1:2 for 8 h, and then 0.7 g of silane coupling agent KH-550 was added and ball-milled for 10 h. After drying, a composite antistatic filler was obtained;

[0044] (2) 70 g of water-based acrylic emulsion and 23.4 g of composite antistatic filler were put into a mixing kettle and stirred for 1 h, 10 g of water was added, and then 1 g of inorganic filler silica and 2 g of film-forming aid propylene glycol were added and stirred for 0.5 h, and finally 10 g of water was added and stirred for 1 h.

[0045] Comparative Example 3

[0046] 70g of water-based acrylic emulsion and 11.59g of antistatic agent fatty acid glyceride were put into a mixing kettle and stirred for 1h, 10g of water was added, and then 1g of inorganic filler silica and 2g of film-forming aid propylene glycol were added and stirred for 0.5h, and finally 10g of water was added and stirred for 1h.

[0047] Performance Testing

[0048] The coatings obtained in Examples 1-4 and Comparative Examples 1-3 were sprayed on ZL101 aluminum alloy sheets and dried at 100° C. The thickness of the obtained coatings was 80-110 μm. The specific performance test results are shown in Table 1 below.

[0049] Table 1 Performance test table of Examples 1-4 and Comparative Examples 1-3

[0050]

[0051] By comparing the examples with the comparative examples, it can be seen that the addition of silane coupling agent can significantly improve the compatibility with the film-forming substrate, thereby improving the overall mechanical properties and antistatic properties, while the addition of antistatic agent and composite conductive filler further improves the antistatic properties of the coating.

Claims

1. An antistatic coating for electrical appliances, characterized in that: Including the following raw materials by mass: 70-80 parts of water-based acrylic emulsion, 35-45 parts of composite antistatic filler, 1-2 parts of inorganic filler, 2-4 parts of film-forming aid, 20-30 parts water, The composite antistatic filler is composed of a composite conductive filler and an antistatic agent in a mass ratio of (2-3):1; the composite conductive filler includes nano-scale carbon black, graphite and zinc oxide in a mass ratio of (3-4):(3-4):1; and the antistatic agent is fatty acid glyceride.

2. The antistatic coating for electrical appliances according to claim 1, characterized in that: The solid content of water-based acrylic emulsion is 33%-35%.

3. The antistatic coating for electrical appliances according to claim 1, characterized in that: The inorganic filler is one or both of silicon dioxide and aluminum oxide.

4. The antistatic coating for electrical appliances according to claim 1, characterized in that: The film-forming aid is propylene glycol.

5. The antistatic coating for electrical appliances according to claim 1, characterized in that: The preparation method of the composite filler is as follows: nano-scale carbon black, graphite and zinc oxide are mixed with ethanol to form a suspension with a solid content of 15%-20%, ball milled with a planetary ball mill for 8-10 hours, an antistatic agent is added and ball milled for 8-10 hours, and then a silane coupling agent is added and ball milled for 10-12 hours, and the composite filler is obtained after drying.

6. The antistatic coating for electrical appliances according to claim 5, characterized in that: The silane coupling agent is one of KH-550 and KH-560.

7. The antistatic coating for electrical appliances according to claim 5, characterized in that: The added amount of the silane coupling agent is 0.5%-1.5% of the total mass of the nano-scale carbon black, graphite and zinc oxide.

8. The antistatic coating for electrical appliances according to claim 5, characterized in that: The drying temperature is 80-100℃.

Images