A 10kV line spray-type fast-curing conductive paste

Abstract

The invention discloses a 10kV line spray-type fast-curing conductive paste, which is based on a conductive composite material of graphene and polymer, and is prepared into a polymer compound with special functional groups by using organic carriers such as dimethylacetamide, synthetic grease, silicone oil, ethylene glycol butyl ether, ethyl cellulose, polyimide resin, epoxy resin and graphene (particle size is 20-35 nanometers respectively). It is a conductive paste with fast curing, sprayability, strong adhesion, large diameter-thickness ratio and excellent mechanical properties. It can replace the previous power outage maintenance and fault elimination method, and quickly and efficiently handle heating defects through live long-distance spraying or close-range smearing, reduce distribution network power outages, increase supply and reduce outages, and effectively ensure the safety of live workers in heating and fault elimination.

Description

Technical Field

[0001] The invention belongs to the field of connection contact coating of electric power equipment, and in particular relates to a 10kV line spray-type fast-curing conductive paste and a preparation method thereof. Background Art

[0002] Power conductive paste is used in the field of contact coating of power equipment. The connectivity of power equipment is an important factor in the safe operation of the power grid and the key to reducing the heating failure of power equipment connection. Among them, power conductive paste is an electrical contact coating with good electrical properties. It is suitable for the coating of copper-copper, copper-aluminum, and aluminum-aluminum overlap surfaces. It can prevent the overlap surface from being corroded by the atmosphere and corrosive agents, resulting in oxidation and electrochemical corrosion, thereby stabilizing the contact resistance of the contact and reducing the heating of the connection. Since the connection points of power equipment in operation are easily affected by wind swing and electrical vibration, the connection points may become loose and the conductive paste may fall off, increasing the contact resistance and causing the connection points to heat up. Although the traditional power conductive paste under the existing technology can eliminate invisible electrical gaps, make the contact tighter, and reduce heat, it does not have conductivity when filling large electrical gaps in blocks, and cannot be filled with electricity for secondary thermal fault elimination. The traditional simple live fastening fault elimination effect is poor and has a high risk factor, resulting in an increase in power outage thermal fault elimination projects.

[0003] In order to ensure the safe operation of power grid equipment, reduce thermal failures in equipment connections, alleviate the workload of thermal fault elimination and the pressure of power outages caused by power outages, it has become an urgent problem to develop a conductive paste coating that is suitable for filling large electrical gaps in various climatic environments and has excellent conductivity, fast curing, strong adhesion and strong bonding. Therefore, technical research on the conductivity, fast curing, adhesion and bonding of power conductive pastes is particularly important.

[0004] In summary, the present invention proposes a conductive paste coating with excellent conductivity for filling large electrical gaps, fast curing, strong adhesion and strong bonding, which solves the technical problem that traditional conductive pastes do not have conductivity, fast curing, strong adhesion and strong bonding when filling large electrical gaps in blocks. Summary of the invention

[0005] The object of the present invention is to provide a 10kV line spray-type fast-curing conductive paste and a preparation method thereof. In order to solve the problems of block conductivity, fast curing, sprayability, and strong adhesion of traditional conductive pastes, the present invention studies and analyzes conductive paste materials, component combinations, and proportions, and uses dimethylacetamide, synthetic grease, silicone oil, ethylene glycol butyl ether, ethyl cellulose, polyimide resin, epoxy resin and other organic carriers and graphene (particle sizes are 20-35 nanometers respectively) to prepare a polymer compound with special functional groups. It is a conductive paste with fast curing, sprayability, strong adhesion, super large diameter-to-thickness ratio and excellent mechanical properties. It can replace the previous power outage maintenance and fault elimination method, and quickly and efficiently handle heating defects through live long-distance spraying or close-range smearing, reduce distribution network power outages, increase supply and reduce outages, and effectively ensure the safety of live workers in heating fault elimination.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A 10kV line spray-type fast-curing conductive paste, whose raw materials, measured by mass, include: 20-30 parts of acrylic resin, 5-10 parts of polyamide resin, 5-10 parts of polyimide resin, 5-10 parts of epoxy resin, 2-5 parts of dimethylacetamide, 5-8 parts of synthetic oil, 10-15 parts of silicone oil, 5-8 parts of ethylene glycol butyl ether, 2-5 parts of ethyl cellulose, 2-5 parts of graphene, 1-5 parts of inorganic pigment, 2-3 parts of dispersant, 1-2 parts of defoamer and 1-2 parts of leveling agent.

[0008] Furthermore, the synthetic grease is electrical contact grease or conductive grease.

[0009] Furthermore, the particle size of the graphene is 20-35 nm.

[0010] A method for preparing a 10kV line spray-type fast-curing conductive paste comprises the following steps:

[0011] (1) mixing acrylic resin, polyamide resin, polyimide resin and epoxy resin by a blending method to obtain a modified acrylic resin;

[0012] (2) adding a dispersant to the modified acrylic resin and stirring evenly;

[0013] (3) then adding dimethylacetamide, synthetic oil, silicone oil, ethylene glycol butyl ether, ethyl cellulose, graphene, and inorganic pigment and stirring evenly;

[0014] (4) Finally, add defoaming agent and leveling agent and stir evenly to obtain the conductive paste.

[0015] The advantages of the present invention are:

[0016] 1. Using dimethylacetamide, synthetic grease, silicone oil, ethylene glycol butyl ether, ethyl cellulose, polyimide resin, epoxy resin and other organic carriers and graphene (particle size is 20-35 nanometers), the ratio is optimized to prepare a conductive paste with excellent large electrical gap filling conductivity, rapid curing, strong adhesion and strong bonding. It can be quickly cured and bonded under high temperature conditions and quickly deal with heating defects by local filling and coating.

[0017] 2. 10kV line filling fast curing conductive paste can effectively block the corrosion of harmful substances such as acid, alkali, salt spray, etc. on metal and non-metal surfaces, achieving long-term high-quality conductive effect.

[0018] 3. The operating temperature of the conductive paste is -40℃~200℃, the contact resistance ratio is <1, and the curing time is less than 30 minutes.

[0019] 4. Compared with traditional conductive pastes, the 10kV line spray-type fast-curing conductive paste developed by the present invention can replace the previous power outage maintenance and fault elimination method. It can not only fill hot spots by applying at a close distance, but also can be sprayed at a long distance under power, thereby improving the safety of live workers in handling hot defects at connection points and ensuring the safety of workers. DETAILED DESCRIPTION

[0020] In order to make the above features and advantages of the present invention more clearly understood, the following embodiments are given for detailed description. The methods of the present invention are all conventional methods in the art unless otherwise specified.

[0021] Example 1

[0022] A 10kV line spray-type fast-curing conductive paste, whose raw materials, measured by mass, include: 25 parts of acrylic resin, 8 parts of polyamide resin, 8 parts of polyimide resin, 8 parts of epoxy resin, 3 parts of dimethylacetamide, 6 parts of synthetic grease, 13 parts of silicone oil, 7 parts of ethylene glycol butyl ether, 3 parts of ethyl cellulose, 3 parts of graphene, 2 parts of inorganic pigment, 2 parts of dispersant, 1 part of defoamer, and 1 part of leveling agent.

[0023] The synthetic grease is grease for electrical contact. The particle size of the graphene is 20-35nm.

[0024] A method for preparing a 10kV line spray-type fast-curing conductive paste comprises the following steps:

[0025] (1) mixing acrylic resin, polyamide resin, polyimide resin and epoxy resin by a blending method to obtain a modified acrylic resin;

[0026] (2) adding a dispersant to the modified acrylic resin and stirring evenly;

[0027] (3) then adding dimethylacetamide, synthetic oil, silicone oil, ethylene glycol butyl ether, ethyl cellulose, graphene, and inorganic pigment and stirring evenly;

[0028] (4) Finally, add defoaming agent and leveling agent and stir evenly to obtain the conductive paste.

[0029] Example 2

[0030] A 10kV line spray-type fast-curing conductive paste, whose raw materials, measured by mass, include: 20 parts of acrylic resin, 5 parts of polyamide resin, 5 parts of polyimide resin, 5 parts of epoxy resin, 2 parts of dimethylacetamide, 5 parts of synthetic oil, 10 parts of silicone oil, 5 parts of ethylene glycol butyl ether, 2 parts of ethyl cellulose, 2 parts of graphene, 1 part of inorganic pigment, 2 parts of dispersant, 1 part of defoamer, and 1 part of leveling agent.

[0031] The synthetic grease is conductive grease. The particle size of the graphene is 20-35 nm.

[0032] A method for preparing a 10kV line spray-type fast-curing conductive paste comprises the following steps:

[0033] (1) mixing acrylic resin, polyamide resin, polyimide resin and epoxy resin by a blending method to obtain a modified acrylic resin;

[0034] (2) adding a dispersant to the modified acrylic resin and stirring evenly;

[0035] (3) then adding dimethylacetamide, synthetic oil, silicone oil, ethylene glycol butyl ether, ethyl cellulose, graphene, and inorganic pigment and stirring evenly;

[0036] (4) Finally, add defoaming agent and leveling agent and stir evenly to obtain the conductive paste.

[0037] Example 3

[0038] A 10kV line spray-type fast-curing conductive paste, whose raw materials, measured by mass, include: 30 parts of acrylic resin, 10 parts of polyamide resin, 10 parts of polyimide resin, 10 parts of epoxy resin, 5 parts of dimethylacetamide, 8 parts of synthetic oil, 15 parts of silicone oil, 8 parts of ethylene glycol butyl ether, 5 parts of ethyl cellulose, 5 parts of graphene, 5 parts of inorganic pigment, 3 parts of dispersant, 2 parts of defoamer, and 2 parts of leveling agent.

[0039] The synthetic grease is conductive grease. The particle size of the graphene is 20-35 nm.

[0040] A method for preparing a 10kV line spray-type fast-curing conductive paste comprises the following steps:

[0041] (1) mixing acrylic resin, polyamide resin, polyimide resin and epoxy resin by a blending method to obtain a modified acrylic resin;

[0042] (2) adding a dispersant to the modified acrylic resin and stirring evenly;

[0043] (3) then adding dimethylacetamide, synthetic oil, silicone oil, ethylene glycol butyl ether, ethyl cellulose, graphene, and inorganic pigment and stirring evenly;

[0044] (4) Finally, add defoaming agent and leveling agent and stir evenly to obtain the conductive paste.

[0045] The main technical indicators of the conductive paste prepared in Example 1 of the present invention are shown in the following table:

[0046] Test items Measured value Test Method Status in container No lumps after stirring GB / T9761-1988 Adhesion, level: ≤1 1 GB / T9286-1998 Fineness: ≤30μm 30 GB / T6753.1-1986 Non-volatile matter content, ≥80% 90 GB / T1725-2007 Surface dry (25±2)℃: ≤30min 15 GB / T1728-1989 Drying (25±4)℃: 24h 12 GB / T1728-1989 Flexibility: ≤2mm 1 GB / T1731-1993 Impact resistance, cm: 50 50 GB / T1732-1993 <![CDATA[Surface resistance 1×10 5 Ω to 1×10 9 Ω]]> <![CDATA[6.96×10 8 ]]> GJB3007A-2009 <![CDATA[Acid resistance (5% H2SO4, 72h)]]> No change GB / T9274-1988 Alkali resistance (10% NaOH, 72h) No change GB / T9274-1988

[0047] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A 10kV line spray-type fast-curing conductive paste, characterized in that: The raw materials include, by mass: 20-30 parts of acrylic resin, 5-10 parts of polyamide resin, 5-10 parts of polyimide resin, 5-10 parts of epoxy resin, 2-5 parts of dimethylacetamide, 5-8 parts of synthetic oil, 10-15 parts of silicone oil, 5-8 parts of ethylene glycol butyl ether, 2-5 parts of ethyl cellulose, 2-5 parts of graphene, 1-5 parts of inorganic pigment, 2-3 parts of dispersant, 1-2 parts of defoamer, and 1-2 parts of leveling agent; The synthetic grease is grease for electrical contact or conductive grease.

2. A 10kV line spray-on fast-curing conductive paste according to claim 1, characterized in that: The particle size of the graphene is 20-35 nm.

3. The method for preparing a 10kV line spray-type fast-curing conductive paste according to claim 1, characterized in that: The following steps are involved: (1) Mixing acrylic resin, polyamide resin, polyimide resin and epoxy resin by a blending method to obtain a modified acrylic resin; (2) Add the dispersant to the modified acrylic resin and stir evenly; (3) Then add dimethylacetamide, synthetic oil, silicone oil, ethylene glycol butyl ether, ethyl cellulose, graphene, and inorganic pigment and stir evenly; (4) Finally, add a defoaming agent and a leveling agent and stir evenly to obtain the conductive paste.