阅读说明：本技术 一种高架桥氟碳底漆及其制备方法 (Viaduct fluorocarbon primer and preparation method thereof ) 是由 孟奎 于 2019-09-29 设计创作，主要内容包括：本发明公开了一种高架桥氟碳底漆及其制备方法,涉及涂料技术领域。其技术要点是：一种高架桥氟碳底漆,包括如下重量份数的组分：改性聚丙烯酸酯乳液：55-65份；颜料：5-25份；增稠剂：0.5-1份；分散剂：0.2-0.8份；消泡剂：0.2-1份；去离子水：15-20份,采用本发明配方制得的氟碳底漆具有具有机械性能好、防腐蚀性强的特点。(The invention discloses a high-level bridge fluorocarbon primer and a preparation method thereof, and relates to the technical field of coatings. The technical key points are as follows: an elevated bridge fluorocarbon primer comprises the following components in parts by weight: modified polyacrylate emulsion: 55-65 parts; pigment: 5-25 parts; thickening agent: 0.5-1 part; dispersing agent: 0.2-0.8 part; defoaming agent: 0.2-1 part; deionized water: 15-20 parts of fluorocarbon primer prepared by the formula has the characteristics of good mechanical property and strong corrosion resistance.)

1. The elevated bridge fluorocarbon primer is characterized by comprising the following components in parts by weight:

modified polyacrylate emulsion: 55-65 parts;

pigment: 5-25 parts;

thickening agent: 0.5-1 part;

dispersing agent: 0.2-0.8 part;

defoaming agent: 0.2-1 part;

deionized water: 15-20 parts.

2. The viaduct fluorocarbon primer according to claim 1, wherein the modified polyacrylate emulsion comprises the following components in parts by weight:

perfluoroalkyl acrylate: 60-80 parts;

octadecyl methacrylate: 20-30 parts of a solvent;

hydroxypropyl acrylate: 10-20 parts;

chlorine substituent modifier: 2.5-3.5 parts;

ammonium persulfate: 1-1.5 parts;

emulsion: 55-60 parts.

3. The elevated bridge fluorocarbon primer according to claim 2, wherein the modified polyacrylate emulsion is obtained by the following preparation steps: adding 1/4-1/2 perfluoroalkyl acrylate, octadecyl methacrylate, hydroxypropyl acrylate and chlorine substituent modifier into the emulsion, heating to 75-85 deg.C, adding ammonium persulfate, and reacting for 0.5 h; adding the rest perfluoroalkyl acrylate, octadecyl methacrylate, hydroxypropyl acrylate and chlorine substituent modifier, reacting for 3-4h, and cooling to room temperature to obtain modified polyacrylate emulsion.

4. An elevated bridge fluorocarbon primer according to claim 2, wherein the chlorine substituent modifier is selected from p-chloromethyl styrene and/or 4-chlorostyrene.

5. The elevated bridge fluorocarbon primer according to claim 2, wherein the emulsion comprises the following components in parts by weight:

deionized water: 55-60 parts;

fatty alcohol polyoxyethylene ether: 0.1-0.3 part;

sodium perfluorononanyloxybenzene sulfonate: 0.1 to 0.3 portion.

6. The overpass fluorocarbon primer of claim 5, wherein the emulsion is obtained by the following preparation steps:

sequentially adding fatty alcohol-polyoxyethylene ether and sodium perfluorononanyloxybenzene sulfonate into deionized water, heating to 70-80 ℃, and reacting for 20-30min to obtain the product.

7. The fluorocarbon primer for viaducts of claim 1, wherein the modified polyacrylate emulsion has a solid content of 44-46% and a pH of 7-8.

8. The viaduct fluorocarbon primer as set forth in claim 1, further comprising 15-20 parts by weight of nano titanium dioxide.

9. The preparation method of the fluorocarbon primer for viaducts as claimed in any one of claims 1 to 8, comprising the steps of:

step one, sequentially adding pigment, dispersant and deionized water into a grinding machine for grinding, and then stirring at a high speed of 1000r/min for 20-30min at 800-;

and step two, adding the modified polyacrylate emulsion, the thickening agent and the defoaming agent into the paint slurry in sequence, and stirring for 10-30min at the rotating speed of 700-.

10. The preparation method of the fluorocarbon primer for viaducts as claimed in claim 9, wherein the fineness of the size is controlled to 20-40 μm.

Technical Field

The invention relates to the technical field of coatings, in particular to a high-level bridge fluorocarbon primer and a preparation method thereof.

Background

The construction and development of urban viaducts are very rapid, and along with the continuous improvement of requirements of social public on urban environment and landscape, the importance of the waterborne anticorrosive coating on the surfaces of various bridges is increasingly shown.

The bridge concrete structure has a plurality of micro channels or holes, and is easily corroded by acid rain, low-temperature freeze thawing, snow-melting agent, mould and algae organisms, so that the durability of the concrete is lost. Some substances enter the concrete and react with the concrete to expand the concrete structure, so that the concrete structure is forced to crack. Corrosion factors (i.e., moisture, oxygen, chloride ions, etc.) permeate into the concrete, causing corrosion of the reinforcing steel bars, further resulting in deterioration of the concrete.

Therefore, a new solution is needed to solve the above problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the fluorocarbon primer for the viaduct, which has the advantages of good mechanical property and strong corrosion resistance.

In order to achieve the first purpose, the invention provides the following technical scheme:

an elevated bridge fluorocarbon primer comprises the following components in parts by weight:

modified polyacrylate emulsion: 55-65 parts;

pigment: 5-25 parts;

thickening agent: 0.5-1 part;

dispersing agent: 0.2-0.8 part;

defoaming agent: 0.2-1 part;

deionized water: 15-20 parts.

By adopting the technical scheme, the fluorocarbon coating has ultra-long weather resistance, the service life of the fluorocarbon coating can reach more than 20 years when the fluorocarbon coating is applied to an overhead bridge, a large amount of manpower, material resources and financial resources required by cleaning and recoating are saved, and the organic fluorine polymer has chemical properties incomparable with hydrocarbon polymers, high chemical resistance, high heat resistance, high surface activity, high hydrophobicity and high oleophobicity. The paint based on organic fluorine resin and modified paint can absorb organic fluorine completely or partially, and has outstanding cold resistance, corrosion resistance, water and oil repellency and chemical stability.

Further preferably, the modified polyacrylate emulsion comprises the following components in parts by weight:

perfluoroalkyl acrylate: 60-80 parts;

octadecyl methacrylate: 20-30 parts of a solvent;

hydroxypropyl acrylate: 10-20 parts;

chlorine substituent modifier: 2.5-3.5 parts;

ammonium persulfate: 1-1.5 parts;

emulsion: 55-60 parts.

By adopting the technical scheme, the fluorine-containing methacrylate and ethylene monomers are used as reaction monomers, homopolymerization or copolymerization is carried out under the action of initiator ammonium persulfate to prepare a polymer, namely the fluorine-containing acrylate polymer, wherein a molecular chain of the polymer has perfluoro or partial fluoroalkyl chain segments. When the fluorine-containing acrylate polymer is formed into a film, fluorine-containing groups extend to the air to form a layer of film, the surface tension of the layer of organic fluorine film is very low and is less than that of water, so that the hydrophobic performance is shown, and in addition, the fluorine-containing acrylate polymer emulsion also has excellent performances such as chemical resistance, environmental friendliness and the like.

Further preferably, the modified polyacrylate emulsion is obtained by the following preparation steps: adding 1/4-1/2 perfluoroalkyl acrylate, octadecyl methacrylate, hydroxypropyl acrylate and chlorine substituent modifier into the emulsion, heating to 75-85 deg.C, adding ammonium persulfate, and reacting for 0.5 h; adding the rest perfluoroalkyl acrylate, octadecyl methacrylate, hydroxypropyl acrylate and chlorine substituent modifier, reacting for 3-4h, and cooling to room temperature to obtain modified polyacrylate emulsion.

By adopting the technical scheme, the conversion rate of the modified acrylic ester is greatly improved and can reach more than 95% by strictly controlling the dosage of each substance, the reaction temperature and the reaction time.

More preferably, the chlorine substituent modifier is selected from p-chloromethyl styrene and/or 4-chlorostyrene.

By adopting the technical scheme, the chlorine substituent modifier is used as a functional monomer, chlorine atoms can be introduced into a molecular chain of the fluorine-containing polymer, the polarity of the polymer is improved, the compatibility of the polymer with other substances is improved, the free energy of the surface of the fluorine-containing polymer is changed in a chemical combination mode, the bonding strength between the fluorine-containing polymer and other interfaces is improved, and the adhesion, hardness, water resistance, alkali resistance, acid resistance and other properties of the coating are obviously improved.

Further preferably, the emulsion comprises the following components in parts by weight:

deionized water: 55-60 parts;

fatty alcohol polyoxyethylene ether: 0.1-0.3 part;

sodium perfluorononanyloxybenzene sulfonate: 0.1 to 0.3 portion.

By adopting the technical scheme, the fluorine-containing acrylate is difficult to be compatible with water, the density of the perfluoroalkyl acrylate is higher than that of the common acrylate, the emulsion is prepared by adding the surfactant into water, so that the polymerization reaction can be normally carried out, and the fatty alcohol-polyoxyethylene ether and the perfluorinated nonoxybenzene sodium sulfonate are compounded and used in the modified polyacrylate emulsion, so that the solid content and the stability of the modified polyacrylate emulsion can be greatly improved.

Further preferably, the emulsion is obtained by the following preparation steps:

sequentially adding fatty alcohol-polyoxyethylene ether and sodium perfluorononanyloxybenzene sulfonate into deionized water, heating to 70-80 ℃, and reacting for 20-30min to obtain the product.

By adopting the technical scheme and the mode, the emulsion is prepared firstly, and the polymerization environment of the fluorine-containing acrylate is provided, so that the conversion rate of the polymer is greatly improved.

More preferably, the solid content of the modified polyacrylate emulsion is 44-46%, and the pH value of the modified polyacrylate emulsion is 7-8.

By adopting the technical scheme, the manufacturing cost of the modified polyacrylate emulsion is increased due to the high solid content, the viscosity of the product is difficult to control, the modified polyacrylate emulsion with the solid content of 44-46% has good adhesive force and wear resistance, and the viscosity is more convenient to control; in addition, the pH value of the modified polyacrylate emulsion is controlled to be 7-8, and when the modified polyacrylate emulsion is mixed with other auxiliary agents for use, the dispersing effect of the pigment can be improved.

Further preferably, the nano titanium dioxide also comprises 15 to 20 parts by weight of nano titanium dioxide.

By adopting the technical scheme, the organic matter and the inorganic matter are combined by adding the nano titanium dioxide, gradient separation can be generated in the film forming process, and the surface roughness is increased, so that the combination of the fluorocarbon primer and the finish paint is more compact, and the addition of the nano titanium dioxide is beneficial to improving the physical and mechanical properties of the hydrophobic coating film, thereby improving the overall application effect of the fluorocarbon primer.

The second purpose of the invention is to provide a preparation method of the high-level bridge fluorocarbon primer, and the high-level bridge fluorocarbon primer prepared by the method has the characteristics of good mechanical property and strong corrosion resistance.

In order to achieve the second purpose, the invention provides the following technical scheme:

a preparation method of a high-level bridge fluorocarbon primer comprises the following steps:

step one, sequentially adding pigment, dispersant and deionized water into a grinding machine, and stirring at a high speed of 1000r/min for 20-30min at 800-;

and step two, adding the modified polyacrylate emulsion, the thickening agent and the defoaming agent into the paint slurry in sequence, and stirring for 10-30min at the rotating speed of 700-.

More preferably, the fineness of the mill base is controlled to be 20-40 μm.

By adopting the technical scheme, the paint paste with the fineness within the range of 20-40 mu m has better dispersity and stable emulsion, and can be quickly and uniformly dispersed and mixed with the pigment after the modified polyacrylate emulsion is added, so that the stirring time is greatly shortened.

In summary, compared with the prior art, the invention has the following beneficial effects:

(1) the paint based on the organic fluorine resin and modified by the organic fluorine resin completely or partially absorbs the super-long characteristic of the organic fluorine, and has outstanding cold resistance, corrosion resistance, water and oil repellency and chemical stability;

(2) fluorine-containing methacrylate and ethylene monomers are used as reaction monomers, homopolymerization or copolymerization is carried out under the action of initiator ammonium persulfate to prepare a polymer, namely the fluorine-containing acrylate polymer, a molecular chain of the polymer has perfluoro or partial fluoroalkyl chain segment, and the polymer has excellent performances such as chemical resistance, environmental friendliness and the like;

(3) the invention also provides a complex emulsion which uses two surfactants of fatty alcohol-polyoxyethylene ether and sodium perfluorononanoyloxy benzene sulfonate, so that the solid content and the stability of the modified polyacrylate emulsion are greatly improved.

Drawings

FIG. 1 is a process flow diagram in example 1 of the present invention.

Detailed Description

The invention is described in detail below with reference to the figures and examples. It is to be noted that those not indicated for specific conditions, carried out under the conventional conditions or conditions recommended by the manufacturer, and those not indicated for the reagents or equipment, are conventional products which can be obtained by commercially purchasing them.

Wherein the pigment is selected from copper chromium black; the thickening agent is selected from the commercially available DS-T150; the dispersant is selected from commercially available DH-5038; the defoaming agent is selected from commercial TCB-1.