阅读说明：本技术 一种抗菌耐磨粮食机械的油漆喷涂方法 (Paint spraying method of antibacterial wear-resistant grain machinery ) 是由 申慧君 于 2019-09-25 设计创作，主要内容包括：本发明公开了一种抗菌耐磨粮食机械的油漆喷涂方法,将一水合柠檬酸溶解到去离子水-乙醇溶液中,滴加到纳米氧化锌悬浮液中,在油浴中磁力搅拌,用乙醇洗涤、离心、真空干燥得表面改性纳米氧化锌；将聚醚砜加入到N,N-二甲基乙酰胺中,磁力搅拌溶解得聚醚砜溶液；将短切碳纤维加入到N,N-二甲基乙酰胺中,机械搅拌后,倒入聚醚砜溶液机械搅拌,倒入乙醇中抽滤、用无水乙醇洗涤,干燥得聚醚砜包覆的碳纤维；将硅烷改性的纳米二氧化钛、所得表面改性纳米氧化锌和聚醚砜包覆的碳纤维加入纯水中,超声分散均匀后,加入到水性氟碳涂料中,搅拌均匀后超声,得到抗菌耐磨油漆；将所得抗菌耐磨油漆均匀喷涂到粮食机械表面,静置后,热风吹干。(The invention discloses a paint spraying method of an antibacterial wear-resistant grain machine, which comprises the steps of dissolving citric acid monohydrate into a deionized water-ethanol solution, dropwise adding into a nano zinc oxide suspension, magnetically stirring in an oil bath, washing with ethanol, centrifuging, and drying in vacuum to obtain surface-modified nano zinc oxide; adding the polyether sulfone into N, N-dimethylacetamide, and dissolving by magnetic stirring to obtain a polyether sulfone solution; adding the chopped carbon fibers into N, N-dimethylacetamide, mechanically stirring, pouring a polyether sulfone solution, mechanically stirring, pouring into ethanol, performing suction filtration, washing with absolute ethanol, and drying to obtain polyether sulfone-coated carbon fibers; adding silane-modified nano titanium dioxide, the obtained surface-modified nano zinc oxide and the carbon fiber coated by polyether sulfone into pure water, ultrasonically dispersing uniformly, adding into the water-based fluorocarbon coating, stirring uniformly, and ultrasonically treating to obtain the antibacterial wear-resistant paint; and uniformly spraying the obtained antibacterial wear-resistant paint on the surface of a grain machine, standing, and drying by hot air.)

1. The paint spraying method of the antibacterial wear-resistant grain machinery is characterized by comprising the following steps of:

surface-modified nano zinc oxide:

adding 1-2 parts of amino functionalized nano zinc oxide 1:100 into deionized water-ethanol solution, and performing ultrasonic treatment to obtain nano zinc oxide suspension; dissolving 0.3-0.6 part of citric acid monohydrate into 200 parts of deionized water-ethanol solution of 100-200 parts, adjusting the pH to 7-8 by using sodium hydroxide solution, dropwise adding into the nano zinc oxide suspension, magnetically stirring for 2-3h in an oil bath at 35-40 ℃, washing for 3-5 times by using ethanol, centrifuging for 15-20min, and vacuum drying at 60-65 ℃ to obtain surface modified nano zinc oxide;

(2) surface treatment of carbon fibers:

adding 0.05-0.1 part of polyether sulfone into 1.4-2.8 parts of N, N-dimethylacetamide, and dissolving by magnetic stirring to obtain a polyether sulfone solution; adding 1-2 parts of chopped carbon fibers into 47-94 parts of N, N-dimethylacetamide, mechanically stirring, pouring a polyether sulfone solution, mechanically stirring for 1-2 hours, pouring into ethanol, performing suction filtration, washing with absolute ethanol for 3-5 times, and drying at 80-85 ℃ to obtain polyether sulfone-coated carbon fibers;

(3) the paint spraying method comprises the following steps:

adding 2-3 parts of silane-modified nano titanium dioxide, the surface-modified nano zinc oxide obtained in the step (1) and the carbon fiber coated by the polyether sulfone obtained in the step (2) into 400-500 parts of pure water, performing ultrasonic treatment for 10-20min to uniformly disperse the mixture, adding the mixture into 60-70 parts of aqueous fluorocarbon coating, and performing ultrasonic treatment for 10-20min after uniform stirring to obtain the antibacterial wear-resistant paint;

uniformly spraying the obtained antibacterial wear-resistant paint on the surface of a grain machine at the pressure of 1-2MPa, standing for 20-30min, and drying by hot air.

2. The paint spraying method of the antibacterial wear-resistant grain machinery as claimed in claim 1, wherein the amino functionalization of the nano zinc oxide powder in the step (1):

dissolving 0.5-1 part of nano zinc oxide powder in 19-38 parts of N, N-dimethylformamide, performing ultrasonic dispersion, adding 0.095-0.19 part of silane coupling agent KH550, reacting for 20-30min, centrifuging, washing, and vacuum drying to obtain amino-functionalized nano zinc oxide;

the volume ratio of the deionized water to the ethanol is 8:2, and the concentration of the sodium hydroxide solution is 2-4 mol/L.

3. The paint spraying method of the antibacterial wear-resistant grain machinery as claimed in claim 1, wherein in the step (3), the surface modification of the nano titanium dioxide: adding absolute ethyl alcohol into 5-10 parts of nano titanium dioxide, carrying out ultrasonic treatment for 1-2h, then dropwise adding 0.15-0.3 part of silane coupling agent KH570, dropwise adding 25% ammonia water to adjust the pH value to 8-9, introducing nitrogen, heating and stirring at 60-65 ℃ for reaction for 1-2h, centrifuging, sequentially washing with ethyl alcohol and water for 3-5 times, and drying to obtain the silane modified nano titanium dioxide.

4. The paint spraying method of antibacterial wear-resistant grain machinery as claimed in claim 1, wherein the paint spraying in step (3) is 0.2-0.3mm in thickness and the spraying time is 10-20 min.

Technical Field

The invention belongs to the field of paint spraying, and particularly relates to a paint spraying method of an antibacterial wear-resistant grain machine.

Background

The wear is taken as a common failure mode of metal materials, so that the service life of metal parts is shortened, simultaneously, the waste of resources and energy is caused, and the immeasurable national economic loss is brought, therefore, the improvement of the wear resistance of the metal materials has important significance, and the research of the frictional wear performance of grain machinery is mainly used. Mechanical paint, also known as mechanical coating, is a coating coated on the surface of machinery and various machine parts, and is mainly applied to the surface decoration protection of machine tools, equipment, automobiles, hardware, glass fiber reinforced plastics and the like.

The nano zinc oxide is an effective sterilization material, shows better reinforcing property to polymers, and modifies the surface of the nano zinc oxide by adopting a silane coupling agent KH550 and citric acid monohydrate in order to prepare an antibacterial composite material with uniform nano particle dispersion and high stability.

It is known that nanoparticles belong to the group of rigid particles, and it is far from sufficient to improve the tribological wear properties of composite materials with a single nanoparticle to achieve the desired effect. With the change of application environment and the requirement of external conditions, the requirement on the wear resistance of the material is higher and higher. Therefore, it is necessary to add other reinforcing materials to the pure resin to synergistically modify the materials together with the nanoparticles, so that the friction coefficient and the wear rate of the materials are lower. With the development and progress of society and industry, the requirements on friction materials are higher and higher, and the single high polymer material cannot completely meet the requirements of demanders on the wear resistance of the materials.

The carbon fiber is one of widely used reinforcing materials, has high heat resistance, mechanical strength, abrasion resistance and the like, and is subjected to surface coating treatment by a physical method in order to improve the interaction between the carbon fiber and a paint interface, and the silane coupling agent KH570 is also selected to treat the nano titanium dioxide to obtain the modified nano particles. Therefore, the carbon fiber and the titanium dioxide are doped to reduce the friction coefficient and the wear rate of the paint, so that the paint has more excellent wear resistance, and the application range of the paint in the friction field is widened.

Disclosure of Invention

The invention aims to solve the existing problems and provides a paint spraying method of an antibacterial wear-resistant grain machine, and the grain machine sprayed according to the method has excellent antibacterial and bacteriostatic properties and friction and wear resistance.

The invention is realized by the following technical scheme:

a paint spraying method of an antibacterial wear-resistant grain machine comprises the following steps of:

(1) surface-modified nano zinc oxide:

adding 1-2 parts of amino functionalized nano zinc oxide 1:100 into deionized water-ethanol solution, and performing ultrasonic treatment to obtain nano zinc oxide suspension; dissolving 0.3-0.6 part of citric acid monohydrate into 200 parts of deionized water-ethanol solution of 100-200 parts, adjusting the pH to 7-8 by using sodium hydroxide solution, dropwise adding into the nano zinc oxide suspension, magnetically stirring for 2-3h in an oil bath at 35-40 ℃, washing for 3-5 times by using ethanol, centrifuging for 15-20min, and vacuum drying at 60-65 ℃ to obtain surface modified nano zinc oxide;

the modified nano zinc oxide surface is modified by using citric acid monohydrate as a modifier, wherein the citric acid monohydrate is a natural organic acid with three carboxyl structures, can be subjected to esterification reaction with hydroxyl on the surface of the nano zinc oxide to generate ester bonds, a citric acid monohydrate molecular layer exists on the surface of the modified nano zinc oxide, and the functional groups of the two functional groups interact with each other, so that the agglomeration phenomenon among the surface-modified nano zinc oxide particles is obviously improved, the dispersion effect is good, the modified nano zinc oxide can be stably dispersed in a medium for a long time, and the surface-modified nano zinc oxide has an antibacterial ring and has a better antibacterial effect;

(2) surface treatment of carbon fibers:

adding 0.05-0.1 part of polyether sulfone into 1.4-2.8 parts of N, N-dimethylacetamide, and dissolving by magnetic stirring to obtain a polyether sulfone solution; adding 1-2 parts of chopped carbon fibers into 47-94 parts of N, N-dimethylacetamide, mechanically stirring, pouring a polyether sulfone solution, mechanically stirring for 1-2 hours, pouring into ethanol, performing suction filtration, washing with absolute ethanol for 3-5 times, and drying at 80-85 ℃ to obtain polyether sulfone-coated carbon fibers;

the carbon fiber is coated by the polyether sulfone through a physical method, the coated carbon fiber can be uniformly dispersed in the paint, the dispersion degree of the carbon fiber in the paint is favorably improved, the interfacial cohesiveness of the carbon fiber and the paint can be improved, the thermal stability of the paint is favorably improved due to the addition of the carbon fiber, the wear resistance of the paint is improved due to the proper addition of the carbon fiber, and the friction coefficient and the wear rate of the paint are reduced;

(3) the paint spraying method comprises the following steps:

adding 2-3 parts of silane-modified nano titanium dioxide, the surface-modified nano zinc oxide obtained in the step (1) and the carbon fiber coated by the polyether sulfone obtained in the step (2) into 400-500 parts of pure water, performing ultrasonic treatment for 10-20min to uniformly disperse the mixture, adding the mixture into 60-70 parts of aqueous fluorocarbon coating, and performing ultrasonic treatment for 10-20min after uniform stirring to obtain the antibacterial wear-resistant paint;

uniformly spraying the obtained antibacterial wear-resistant paint on the surface of a grain machine at the pressure of 1-2MPa, standing for 20-30min, and drying by hot air;

the antibacterial wear-resistant paint is prepared by taking water-based fluorocarbon coating, surface-modified nano zinc oxide, polyether sulfone-coated carbon fiber and silane-modified nano titanium dioxide as raw materials, and can endow grain machinery with excellent antibacterial performance and wear resistance;

further, amino functionalization of the nano zinc oxide powder in the step (1): dissolving 0.5-1 part of nano zinc oxide powder in 19-38 parts of N, N-dimethylformamide, performing ultrasonic dispersion, adding 0.095-0.19 part of silane coupling agent KH550, reacting for 20-30min, centrifuging, washing, and vacuum drying to obtain amino-functionalized nano zinc oxide;

the volume ratio of the deionized water to the ethanol is 8:2, and the concentration of the sodium hydroxide solution is 2-4 mol/L.

Further, in the step (3), the surface modification of the nano titanium dioxide is as follows: adding absolute ethyl alcohol into 5-10 parts of nano titanium dioxide, carrying out ultrasonic treatment for 1-2h, then dropwise adding 0.15-0.3 part of silane coupling agent KH570, dropwise adding 25% ammonia water to adjust the pH value to 8-9, introducing nitrogen, heating and stirring at 60-65 ℃ for reaction for 1-2h, centrifuging, sequentially washing with ethyl alcohol and water for 3-5 times, and drying to obtain the silane modified nano titanium dioxide.

Further, the thickness of the paint spraying in the step (3) is 0.2-0.3mm, and the spraying time is 10-20 min.

Compared with the prior art, the invention has the following advantages:

(1) the silane coupling agent KH550 is used for carrying out surface modification on the nano zinc oxide powder, the molecular structure of the nano zinc oxide powder has both organic groups and inorganic structures, organic active functional groups can react with polymer molecules to generate covalent bonds, and hydrolyzed groups can also carry out condensation reaction with hydroxyl on the surface of an inorganic substance or with oxides to form stable silicon-oxygen bonds, so that amino-functionalized nano zinc oxide with uniform size and good dispersibility is obtained, the surface energy of the nano zinc oxide is reduced, the agglomeration of the nano zinc oxide can be effectively prevented, and the antibacterial performance of the nano zinc oxide is improved;

the modified nano zinc oxide surface is modified by using citric acid monohydrate as a modifier, the citric acid monohydrate is a natural organic acid with three carboxyl structures, and can be subjected to esterification reaction with hydroxyl on the nano zinc oxide surface to generate ester bonds, a citric acid monohydrate molecular layer exists on the modified nano zinc oxide surface, and the functional groups of the two functional groups interact with each other, so that the agglomeration phenomenon among the surface-modified nano zinc oxide particles is obviously improved, the dispersion effect is good, the modified nano zinc oxide can be stably dispersed in a medium for a long time, and the surface-modified nano zinc oxide has an antibacterial ring and has a better antibacterial effect.

(2) The carbon fiber is coated by the polyether sulfone through a physical method, the coated carbon fiber can be uniformly dispersed in the paint, the dispersion degree of the carbon fiber in the paint is favorably improved, the interface cohesiveness of the carbon fiber and the paint can be improved, the thermal stability of the paint is favorably improved due to the addition of the carbon fiber, the wear resistance of the paint is improved due to the proper addition of the carbon fiber, and the friction coefficient and the wear rate of the paint are reduced.

(3) The antibacterial wear-resistant paint is prepared by taking water-based fluorocarbon coating, surface-modified nano zinc oxide, polyether sulfone-coated carbon fiber and silane-modified nano titanium dioxide as raw materials, and can endow grain machinery with excellent antibacterial performance and wear resistance;

the nano titanium dioxide is subjected to surface treatment and modification by a coupling agent grafting means, the agglomeration degree of the silane-modified nano titanium dioxide is reduced, the dispersion degree in paint and the interaction of a grain mechanical interface are improved after the surface treatment, the wear resistance is improved, the friction factor and the wear rate are both reduced, the high-temperature thermal stability is better, and the application range and the use condition of the modified material in the field of friction materials are further widened;

the carbon fiber coated by the polyether sulfone and the silane modified nano titanium dioxide have a good synergistic effect, in the friction process, titanium dioxide particles falling off along with friction can be enriched around the carbon fiber, the effect of temporarily fixing the carbon fiber is achieved between a sample and a steel disc matching pair, further damage of the carbon fiber is reduced, the carbon fiber is not prone to being turned over and pulled out from paint, the interface debonding degree is reduced, in addition, the nano particles can serve as rolling bodies between two matching surfaces, a certain degree of rolling rather than relative sliding is achieved between the two matching surfaces, and then the shearing stress, the friction factor and the contact temperature of the friction surfaces are reduced.

Detailed Description