CN1821325A - Preparation method of wear-resistant and corrosion-resistant nano-composite epoxy asphalt repair coating - Google Patents

Abstract

The present invention discloses the preparation process of antiwear, anticorrosive nanometer composite epoxy asphalt repair paint. The repair paint has organic surfactant coated nanometer level functional powder in 2-15 wt% added, and the nanometer level functional powder is one or two selected from titania, silica, zinc oxide, nickel oxide, alumina, chromium oxide, manganese oxide and barium sulfate. The nanometer level powder is first dispersed in small amount of epoxy resin through ball milling, sand grinding or high speed emulsification to form slurry, and the slurry is then mixed with the main epoxy asphalt repair paint component to obtain the antiwear, anticorrosive nanometer composite epoxy asphalt repair paint. The composite epoxy asphalt repair paint is used in repairing coated film and has high anticorrosive performance and high scratch resistance.

Description

Preparation method of wear-resistant and corrosion-resistant nano-composite epoxy asphalt repair coating

technical field

The invention relates to a preparation method of an epoxy resin-based coating composition, and more specifically relates to a preparation method of an epoxy asphalt repair coating added with nano functional powder.

Background technique

The ocean is a very corrosive environment. Almost all parts of marine engineering facilities and marine ships need anti-corrosion protection. Therefore, the scope of marine anti-corrosion coatings is very wide, and they all belong to the category of heavy-duty anti-corrosion coatings, such as anti-rust Primer, hull paint, deck paint, interior cabin paint, container paint, seaport facilities and platform paint, oil tank paint, seawater cooling pipeline and offshore oil pipeline paint, etc. Zinc-rich coatings are currently one of the hot spots in marine engineering protective coatings. The earliest zinc-rich paint was invented by Australian Victov Nightingale in the 1930s, an inorganic zinc-rich paint prepared by adding an equal amount of zinc powder to water glass. After about 70 years of development, zinc-rich coatings have become more and more mature, and many types have been developed to successfully protect ships, offshore oil production platforms, docks, gates, storage tanks, pipelines, bridges, etc. In the past 20 years, the coating system of using zinc-rich primer for the primer, epoxy mica iron oxide paint for the intermediate paint, and high-performance weather-resistant paint for the topcoat has become the common anti-corrosion coating for modern large-scale steel structures at home and abroad. measure.

With the advancement of mankind to the ocean, the further upgrading and diversification of the marine economy and marine industry, people have put forward higher requirements for epoxy zinc-rich coatings, and epoxy zinc-rich coatings are also one of the current hot spots for marine engineering protective coatings. . Epoxy asphalt repair coating is a coating combined with epoxy zinc-rich primer. When the engineering components coated with paint are leaked or the paint film is damaged due to construction collisions and other reasons, the epoxy asphalt repair coating can repair these defective parts in time. Of course, people have also put forward higher requirements for epoxy asphalt repair coatings in terms of corrosion resistance and scratch resistance, such as high protection performance, low resource consumption, and environmental and ecological friendliness. At present, the development of epoxy asphalt repair coatings is no longer just focusing on the protective properties of the coatings. Researchers have been trying to improve the overall performance of epoxy asphalt repair coatings while improving their protective properties. It has been found that the key to improving the overall performance of epoxy asphalt repair coatings is to further improve the overall quality of the epoxy asphalt repair coating after film formation. High seawater corrosion resistance and scratch resistance are important features. Practice has shown that the key to improving the coating quality of epoxy asphalt repair coatings lies in the selection of high-performance epoxy asphalt repair coatings.

At present, general-purpose epoxy asphalt repair coatings are composed of fillers such as resin, zinc powder and auxiliary materials. According to the classic corrosion failure mechanism of the coating film, there are usually three forms of corrosion failure of the coating film in the corrosive medium: one is that the adhesion between the coating and the substrate is poor, and it falls off; the other is that the coating itself is exposed to acid, alkali, salt and other media Third, there are defects in the coating (such as pinholes) or poor impermeability of the coating, such as Na+, Cl- plasma can diffuse through, so that the resistance of the coating is greatly reduced and localized corrosion is caused. The surface scratch resistance of epoxy zinc-rich coating mainly depends on the microscopic and wear resistance of the coating surface. Usually, the main way to improve the seawater corrosion resistance and scratch resistance of the coating film is to use high-performance resins and high-quality fillers and auxiliary materials. However, in the traditional production areas of resins and paint fillers, foreign companies have an absolute advantage. Foreign coating companies have mastered and monopolized a large number of key technologies such as production, separation and purification of high-performance resins, pigments and fillers, while domestic companies have no advantages in this field. The development of nanotechnology provides new opportunities for domestic enterprises to upgrade the technical content of traditional industries. Nanoparticles have special effects such as surface effect, small size effect, quantum size effect, and macroscopic quantum tunneling effect. When used in coatings, the optical, magnetic, electrical, and mechanical properties of the coating can be improved or given new functions. At home and abroad, there is still a lack of relevant reports on the use of nanocomposite powder technology to improve the corrosion resistance and scratch resistance of traditional epoxy asphalt repair coatings. The present invention attempts to fill this gap.

Contents of the invention

The technical problem to be solved by the present invention is to provide a preparation method of wear-resistant and corrosion-resistant nano-composite epoxy asphalt repair coating.

The technical scheme adopted in the present invention: a preparation method of wear-resistant and corrosion-resistant nano-composite epoxy asphalt repair coating, comprising the following steps:

a. Take nano-scale functional powders with an average particle size of less than 100nm, and coat them with organic surfactant sodium laurate. The nano-scale functional powders are selected from titanium oxide, silicon oxide, zinc oxide, and nickel oxide , aluminum oxide, chromium oxide, manganese oxide or a mixture of two or more of them, the amount of the organic surfactant sodium laurate is 1 to 10% of the weight of the nano-scale functional powder;

b. The nano-scale functional powder coated with the organic surfactant sodium laurate is subjected to ball milling, sand milling or high-speed emulsification and dispersion treatment in a small amount of epoxy resin, so that the nano-scale functional powder is evenly dispersed in the epoxy resin, prepare a slurry;

c. fully mix the slurry prepared in step b with the epoxy asphalt repair coating body, and control the dosage of the nano-scale functional powder to be 2 to 15% of the weight of the epoxy asphalt repair coating body to obtain the product nanometer Composite epoxy bitumen repair coating.

The average particle size of the nanoscale functional powder in step a is 30-50 nm.

The dosage of the nano-scale functional powder in step c is 3-6% of the weight of the epoxy asphalt repair coating body.

Beneficial effects of the present invention: the process of the present invention is simple, and the nano-powder is efficiently dispersed in the coating, which can not only give full play to the excellent characteristics of electricity and heat after the material is nano-sized, but also effectively fill the pinholes of the coating, Significantly reduce the formation of various defects in the coating, thereby achieving the purpose of significantly improving the comprehensive performance of conventional epoxy asphalt repair coatings.

Detailed ways

The present invention is further described in detail by examples, a preparation method of wear-resistant and corrosion-resistant nano-composite epoxy asphalt repair coating, comprising the following steps: a. taking nano-scale functional powders with an average particle diameter less than 100nm, and using an organic surfactant It is coated with sodium laurate, and the nano-scale functional powder is selected from one or two of titanium oxide, silicon oxide, zinc oxide, nickel oxide, aluminum oxide, chromium oxide, manganese oxide or barium sulfate Mixture, the consumption of described organic surfactant sodium laurate is 1～10% of described nanoscale functional powder weight; b. above-mentioned nanoscale functional powder coated with organic surfactant sodium laurate in a small amount Epoxy resin is carried out dispersing treatment, makes it disperse evenly, makes slurry, and the method of dispersing can be ball mill, sand mill or high-speed emulsification etc.; c. fully mix the slurry prepared in step b with epoxy asphalt repair coating body, The dosage of the nano-scale functional powder is controlled to be 2-15% of the weight of the epoxy asphalt repair coating, and the product nano-composite epoxy asphalt repair coating is obtained. The effect is better when the average particle size of the nano-scale functional powder in step a is 30-50 nm. The effect is better when the dosage of the nano-scale functional powder in step c is 3-6% of the body weight of the epoxy asphalt repair coating.

Embodiment one

Take titanium oxide with an average particle size of 30nm, and use an organic surface treatment agent sodium laurate to coat it. The dosage is 1% of the weight of nano-powder titanium oxide. First, take a small amount of epoxy resin and add a certain amount of treated titanium oxide particles. and disperse in a sand mill to obtain a slurry; after fully mixing the slurry with the original epoxy asphalt repair coating body, a nano-composite epoxy asphalt repair coating is obtained, and the addition of titanium oxide is 2% of the coating weight. The paint was uniformly rolled on the hot-dip galvanized steel plate, and after drying at room temperature, the coating film sample A was obtained. Reserved for performance evaluation tests.

Embodiment two

Take titanium oxide with an average particle size of 30nm, and use organic surface treatment agent sodium laurate to coat it. The dosage is 3% of the weight of nano-powder titanium oxide. First, take a small amount of epoxy resin and add a certain amount of treated titanium oxide particles. and disperse in a sand mill to obtain a slurry; after fully mixing the slurry with the original epoxy asphalt repair paint body, a nano-composite epoxy asphalt repair paint is obtained, and the addition of titanium oxide is 3% of the weight of the paint. The paint was uniformly rolled on the hot-dip galvanized steel plate, and after drying at room temperature, the coating film sample B was obtained. Reserved for performance evaluation tests.

Embodiment Three

Take titanium oxide with an average particle size of 20nm, and use organic surface treatment agent sodium laurate to coat it. The dosage is 3% of the weight of nano-powder titanium oxide. First, take a small amount of epoxy resin and add a certain amount of treated titanium oxide particles. and disperse in a sand mill to obtain a slurry; after fully mixing the slurry with the original epoxy asphalt repair coating body, a nano-composite epoxy asphalt repair coating is obtained, and the addition of titanium oxide is 4% of the coating weight. The paint was uniformly rolled on the hot-dip galvanized steel plate, and after drying at room temperature, the coating film sample C was obtained. Reserved for performance evaluation tests.

Embodiment Four

Take silicon oxide with an average particle size of 50nm, and use organic surface treatment agent sodium laurate for coating treatment. The dosage is 10% of the weight of nano-powder silicon oxide. First, take a small amount of epoxy resin and add a certain amount of treated titanium oxide particles. and dispersing in a sand mill to obtain a slurry; after fully mixing the slurry with the original epoxy asphalt repair coating body, a nano-composite epoxy asphalt repair coating is obtained, and the addition of silicon oxide is 15% of the coating weight. The coating was uniformly rolled on the hot-dip galvanized steel sheet, and after drying at room temperature, the coating film sample D was obtained. Reserved for performance evaluation tests.

The salt spray test was carried out on the nanocomposite epoxy asphalt repair coating boards prepared in Examples 1-4, and the properties of the epoxy asphalt repair coating boards were compared with those of conventional epoxy asphalt repair coating boards, as shown in Table 1.

Table 1 Evaluation of salt spray and scratch resistance of epoxy asphalt repair coating Evaluation Index No. Corrosion resistance (salt spray test) Scratch Epoxy asphalt repair coating board A 1500 hours 0 Epoxy asphalt repair coating board B 1500 hours 0 Epoxy asphalt repair coating board C 1500 hours 0 Epoxy asphalt repair coating board D 1000 hours 0 Conventional epoxy asphalt repair coating board 500 hours 2

It can be seen from the test results that the corrosion resistance and scratch resistance of the epoxy asphalt repair coating film modified by nanomaterials have been significantly improved.

The above content is only a basic description of the concept of the present invention, and any equivalent transformation made according to the technical solution of the present invention shall fall within the scope of protection of the present invention.

Claims (3)

1. A preparation method of wear-resistant and corrosion-resistant nano-composite epoxy asphalt repair coating, comprising the following steps: a. Take nano-scale functional powders with an average particle size of less than 100nm, and coat them with organic surfactant sodium laurate. The nano-scale functional powders are selected from titanium oxide, silicon oxide, zinc oxide, and nickel oxide , aluminum oxide, chromium oxide, manganese oxide or a mixture of two or more of them, the amount of the organic surfactant sodium laurate is 1 to 10% of the weight of the nano-scale functional powder; b. The nano-scale functional powder coated with the organic surfactant sodium laurate is subjected to ball milling, sand milling or high-speed emulsification and dispersion treatment in a small amount of epoxy resin, so that the nano-scale functional powder is evenly dispersed in the epoxy resin, prepare a slurry; c. fully mix the slurry prepared in step b with the epoxy asphalt repair coating body, and control the dosage of the nano-scale functional powder to be 2 to 15% of the weight of the epoxy asphalt repair coating body to obtain the product nanometer Composite epoxy bitumen repair coating. 2. The preparation method of a wear-resistant and corrosion-resistant nano-composite epoxy asphalt repair coating according to claim 1, characterized in that: the average particle size of the nano-scale functional powder in step a is 30-50 nm. 3. according to the preparation method of a kind of wear-resistant and corrosion-resistant nano-composite epoxy asphalt repair coating according to claim 1, it is characterized in that: the consumption of nano-scale functional powder described in the step c is the described epoxy asphalt repair coating body 3-6% of the weight.