阅读说明：本技术 一种防腐蚀光伏电缆涂层及其制备方法 (Anti-corrosion photovoltaic cable coating and preparation method thereof ) 是由 王剑英 刘丹 于 2019-08-06 设计创作，主要内容包括：本发明提供了一种防腐蚀光伏电缆涂层,包括以下重量份组分：环氧树脂20-40份、CeO<Sub>2</Sub>@GO复合粉体0.02-5份、稀释剂8-20份、固化剂1.5-8份、消泡剂0.1-0.5份、流平剂0.1-0.5份。本发明通过表面接枝的方法,利用CeO<Sub>2</Sub>纳米粒子对氧化石墨烯GO进行改性,制备得到CeO<Sub>2</Sub>@GO复合粉体,使CeO<Sub>2</Sub>纳米粒子能够稳定地负载于GO表面,CeO<Sub>2</Sub>纳米粒子穿插在GO层片之间,起到阻碍GO团聚的作用,使GO在环氧树脂基体中的分散性和相容性得以改善,同时GO的存在又为CeO<Sub>2</Sub>纳米粒子提供了良好的支撑体,促进其均匀分散于环氧树脂基体中,使GO和CeO<Sub>2</Sub>均能够更好地发挥各自的抗腐蚀效果及增强作用,进一步提高涂层的防腐蚀性能,能够有效确保光伏电缆的防水性、防腐蚀性、耐候性、化学稳定性、粘附性等综合性能。(The invention provides an anti-corrosion photovoltaic cable coating which comprises the following components in parts by weight: 20-40 parts of epoxy resin and CeO 2 0.02-5 parts of @ GO composite powder, 8-20 parts of diluent, 1.5-8 parts of curing agent, 0.1-0.5 part of defoaming agent and 0.1-0.5 part of flatting agent. The invention utilizes CeO by a surface grafting method 2 Graphene oxide GO is modified by nano particles to prepare CeO 2 @ GO composite powder of CeO 2 The nano particles can be stably loaded on the surface of GO and CeO 2 The nanoparticles are inserted between GO layers to block GO agglomeration, so that the dispersity and compatibility of GO in an epoxy resin matrix are improved, and the GO is CeO 2 The nanoparticles provide good support to promote uniform dispersion in the epoxy resin matrix, resulting in GO and CeO 2 The coating can better exert respective corrosion resistance and enhancement effect, further improve the corrosion resistance of the coating, and effectively ensure the comprehensive properties of the photovoltaic cable such as waterproofness, corrosion resistance, weather resistance, chemical stability, adhesiveness and the like.)

1. The anti-corrosion photovoltaic cable coating is characterized by comprising the following components in parts by weight:

2. the anti-corrosion photovoltaic cable coating of claim 1 wherein the CeO₂The preparation method of the @ GO composite powder comprises the following steps:

a) synthesizing to obtain Graphene Oxide (GO) by adopting an improved Hummers method;

b) for nano CeO₂Surface modification treatment is carried out, and a certain amount of deionized water, ethanol and nano CeO are respectively taken₂Mixing, ultrasonically dispersing for 1h, placing in a flask for later use, taking a certain amount of ethanol, adding a silane coupling agent, adjusting the pH to 3-4 with acetic acid, stirring for 1h, adding into the flask, placing the flask in a 75 ℃ constant-temperature water bath, stirring for 4h, performing suction filtration, repeatedly washing with ethanol for multiple times, placing in a 60 ℃ vacuum drying oven, drying for 24h, and grinding to obtain the surface-modified nano CeO₂；

c) Preparation of CeO₂@ GO composite powder, nano CeO with modified surface₂Adding into DMF, ultrasonically dispersing for 30min, adding GO, ultrasonically dispersing for 30min, stirring the mixture in 105 deg.C oil bath for 4 hr, vacuum filtering, washing with ethanol for several times, drying in 60 deg.C vacuum drying oven for 24 hr, and grinding to obtain CeO₂@ GO composite powder.

3. An anti-corrosion photovoltaic cable coating according to claim 2, wherein: the silane coupling agent in the step b) is KH550, and the silane coupling agent and the nano CeO₂The mass ratio of (A) to (B) is 0.15-1: 1.

4. An anti-corrosion photovoltaic cable coating according to claim 2, wherein: the nano CeO in the step c)₂The mass ratio of the carbon to GO is 1: 3.

5. The anti-corrosion photovoltaic cable coating of claim 1, wherein: the diluent is one of acetone and ethanol.

6. The anti-corrosion photovoltaic cable coating of claim 1, wherein: the defoaming agent is an organic silicon defoaming agent.

7. The anti-corrosion photovoltaic cable coating of claim 1, wherein: the leveling agent is polyether modified organic siloxane.

8. The anti-corrosion photovoltaic cable coating of claim 1, wherein: the curing agent is one of an anhydride curing agent and an amine curing agent.

9. The method of preparing an anti-corrosion photovoltaic cable coating according to any of claims 1 to 8, comprising the steps of: weighing epoxy resin and CeO according to the mass ratio₂The @ GO composite powder and the diluent are ultrasonically dispersed for 1h after being uniformly mixed, the defoaming agent, the leveling agent and the curing agent are sequentially added under mechanical stirring, and after being uniformly stirred, the coating is brushed on the surface of a photovoltaic cable, and an anti-corrosion photovoltaic cable coating is obtained after curing.

Technical Field

The invention relates to the field of photovoltaic cable materials, in particular to an anti-corrosion photovoltaic cable coating and a preparation method thereof.

Background

Photovoltaic cables in photovoltaic systems are used as main electrical components, often under severe environmental conditions (such as high temperature, ultraviolet radiation, ozone, severe temperature changes, chemical erosion, etc.), and therefore, the photovoltaic cables must have good properties of high and low temperature resistance, ultraviolet resistance, weather resistance, ozone erosion resistance, etc. so as to ensure the service life of the photovoltaic cables and even the entire photovoltaic system. The existing photovoltaic cable is generally modified from cable materials and cable sheath materials in order to improve the weather resistance and the corrosion resistance, and less anticorrosive organic coatings are adopted, so that the anticorrosive performance of the existing photovoltaic cable is still deficient even though the coatings are used.

The epoxy resin coating is a common anticorrosive coating, has good chemical resistance, high temperature resistance, toughness and bonding capability, but has the defects of poor outdoor weather resistance, large coating film brittleness and the like, and in addition, the volatilization of a solvent in the curing process can form a plurality of micro-channels inside the coating, so that the corrosion resistance of the coating is reduced, and the modification of the coating is usually needed.

Graphene as a novel nano material has good barrier property and shielding property, and is often used as a functional filler to be applied to an anticorrosive coating. The graphene has a stable sp2 hybrid structure, so that a physical barrier layer can be formed between the coated material and the active medium to prevent diffusion and permeation, and the special lamellar structure has a good physical shielding effect on diffusion of water, oxygen and particles, so that the permeation path of a corrosive medium in the coating can be increased, and the corrosion prevention function of the coated material is achieved. The graphene also has good thermal stability and chemical stability, can keep relatively stable at a high temperature of 600 ℃ and in a corrosive environment, and ensures that the coating still has a good protective effect in an extreme environment. On the basis of keeping a two-dimensional structure of graphene, graphene oxide serving as a graphene derivative is grafted with partial oxygen-containing functional groups including hydroxyl, carboxyl, epoxy and the like, so that the activity and compatibility of the graphene oxide are remarkably enhanced. In addition, graphene and graphene oxide can be used as a filler to be added into a polymer or an alloy besides being used as an anticorrosion coating, and can be used as a reinforcing phase to improve the deficiency of the coating in the aspect of anticorrosion performance.

In the existing anticorrosive coatings, epoxy resin is used as a matrix, and graphene or graphene oxide is used as an anticorrosive additive, so that the defects of the epoxy resin are effectively overcome, a physical shielding effect and a reinforcing effect are achieved, and the anticorrosive coatings have the advantages of good anticorrosive effect, low coating thickness, high adhesive force, light paint film weight, excellent salt spray resistance and the like. However, since graphene and graphene oxide are easily agglomerated and have poor dispersibility and compatibility in an epoxy resin matrix, the use effect thereof is limited, and it is difficult to sufficiently exert the corrosion resistance and the reinforcing effect.

Disclosure of Invention

Aiming at the technical problems, the invention aims to provide an anti-corrosion photovoltaic cable coating and a preparation method thereof.

The technical scheme adopted by the invention is as follows: an anti-corrosion photovoltaic cable coating comprises the following components in parts by weight:

further, the CeO₂The preparation method of the @ GO composite powder comprises the following steps:

a) synthesizing to obtain Graphene Oxide (GO) by adopting an improved Hummers method;

b) for nano CeO₂Surface modification treatment is carried out, and a certain amount of deionized water, ethanol and nano CeO are respectively taken₂Mixing, ultrasonically dispersing for 1h, placing in a flask for later use, taking a certain amount of ethanol, adding a silane coupling agent, adjusting the pH to 3-4 with acetic acid, stirring for 1h, adding into the flask, placing the flask in a 75 ℃ constant-temperature water bath, stirring for 4h, performing suction filtration, repeatedly washing with ethanol for multiple times, placing in a 60 ℃ vacuum drying oven, drying for 24h, and grinding to obtain the surface-modified nano CeO₂；

c) Preparation of CeO₂@ GO composite powder, nano CeO with modified surface₂Adding into DMF, ultrasonic dispersing for 30min, adding GO, continuing ultrasonic dispersing for 30min, stirring the above mixed solution in 105 deg.C oil bath for 4h, vacuum filtering, washing with ethanol repeatedly, drying in 60 deg.C vacuum drying oven for 24h, grindingGrinding to obtain CeO₂@ GO composite powder.

Further, the silane coupling agent in the step b) is KH550, and the silane coupling agent and the nano CeO₂The mass ratio of (A) to (B) is 0.15-1: 1.

Further, the nano CeO in the step c)₂The mass ratio of the carbon to GO is 1: 3.

Further, the diluent is one of acetone and ethanol.

Further, the defoaming agent is an organic silicon defoaming agent.

Further, the leveling agent is polyether modified organic siloxane.

Further, the curing agent is one of an acid anhydride curing agent and an amine curing agent.

The preparation method of the anti-corrosion photovoltaic cable coating comprises the following steps: weighing epoxy resin and CeO according to the mass ratio₂The @ GO composite powder and the diluent are ultrasonically dispersed for 1h after being uniformly mixed, the defoaming agent, the leveling agent and the curing agent are sequentially added under mechanical stirring, and after being uniformly stirred, the coating is brushed on the surface of a photovoltaic cable, and an anti-corrosion photovoltaic cable coating is obtained after curing.

Compared with the prior art, the invention has the following beneficial effects: by surface grafting, using CeO₂Graphene oxide GO modified by nano particles, namely nano CeO₂As a rare earth compound, the rare earth compound has stronger oxidation and reduction capability, excellent oxygen storage and release performance and chemical stability, and can be used as an active filler of an anticorrosive coating. The invention firstly uses silane coupling agent to couple the nanometer CeO₂Coating and modifying the surface, hydrolyzing the silane coupling agent to generate silicon hydroxyl and nano CeO₂Bonding the hydroxyl on the surface, and then treating the surface with the nano CeO₂Compounding with GO to obtain CeO₂The amino group of the silane coupling agent reacts with the carboxyl group on the surface of the graphene oxide to form an amide group so that CeO₂The nano particles can be stably loaded on the surface of GO and CeO₂The nanoparticles are inserted between GO layers to block GO agglomeration, so that GO is in epoxy resin baseThe dispersibility and compatibility in the body are improved, and the GO is CeO₂The nanoparticles provide good support to promote uniform dispersion in the epoxy resin matrix, resulting in GO and CeO₂The coating can better exert respective corrosion resistance and enhancement effect, effectively improves the corrosion resistance of the coating, and can effectively ensure the comprehensive properties of the photovoltaic cable, such as waterproofness, corrosion resistance, weather resistance, chemical stability, adhesiveness and the like by applying the coating to the surface of the photovoltaic cable, thereby prolonging the service life of the photovoltaic cable.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments.