WO2021103661A1

WO2021103661A1 - Quick-setting waterproof spray coating for marine anticorrosion and preparation and construction method therefor

Info

Publication number: WO2021103661A1
Application number: PCT/CN2020/108871
Authority: WO
Inventors: 王荣博; 刘方浩; 严从立; 王志强; 辛海洋; 劳振兴
Original assignee: 山东北方创信防水科技集团股份有限公司
Priority date: 2019-11-27
Filing date: 2020-08-13
Publication date: 2021-06-03
Also published as: CN111040633A; CN111040633B

Abstract

A quick-setting waterproof spray coating for marine anticorrosion and a preparation and construction method therefor. The coating consists of material A and material B. The material A consists of the following components by weight percentage: 40-65% of emulsified asphalt, 27-50% of rubber latex, 8-20% of zinc oxide dispersion liquid, 5-15% of filler slurry, 0.05-3% of sodium silicate aqueous solution, 1.5-2.5% of antiaging agent, 0.03-0.08% of mould-proof bacteriostatic agent, and 0.1-0.3% of defoaming agent; the B material consists of the following components by weight percentage: 5-20% of a soluble metal salt which does not contain chloride ions, 1-5% of ethylene glycol, 0.1-0.5% of alkyl polyoxyethylene ether, and deionized water as balance. A waterproof coating film for marine anticorrosion, prepared from the coating, has good chloride iron penetration resistance and excellent waterproof and antibacterial effects, and can be used for marine construction waterproofing.

Description

Spraying quick-setting waterproof coating for marine anticorrosion, and preparation and construction methods thereof

Technical field

The invention belongs to the technical field of materials, and particularly relates to a spraying quick-setting waterproof coating for marine anticorrosion, and a preparation and construction method thereof.

Background technique

The high Cl ^- concentration in the marine environment has a corrosive effect on the building concrete and the steel bars in the concrete, which seriously affects their service life; and the high humidity in the marine environment will make the building moldy, affecting the performance and appearance of the building . Therefore, the high salinity and high humidity of the marine environment put forward higher requirements for the protective materials of buildings. Therefore, for the waterproofing of buildings in marine areas, our company has developed a corrosion-resistant chloride ion permeability and antibacterial performance. Spraying quick-setting waterproof coating for marine anti-corrosion.

Summary of the invention

In order to make up for the deficiencies of the prior art, the present invention provides a spray quick-setting waterproof coating for marine anticorrosion, and a preparation and construction method thereof.

The technical scheme adopted by the present invention is:

A spraying quick-setting waterproof coating for marine anticorrosion, which is composed of material A and material B. Material A is composed of the following components in terms of mass percentage: emulsified asphalt 40-65%, rubber emulsion 27-50%, zinc oxide dispersion 8 ～20%, filler slurry 5～15%, sodium silicate aqueous solution 0.05～3%, anti-aging agent 1.5～2.5%, anti-mildew and bacteriostatic agent 0.03～0.08%, defoaming agent 0.1～0.3%; material B is by mass percentage The meter is composed of the following components: 5-20% of soluble metal salt without chloride ion, 1-5% of ethylene glycol, 0.1-0.5% of alkyl polyoxyethylene ether, and the rest is deionized water.

Preferably, the emulsified asphalt is an anionic emulsified asphalt with a solid content of 60-63%; the emulsified asphalt is prepared by emulsifying 70# asphalt and/or 90# asphalt.

Preferably, the rubber emulsion is an anionic rubber emulsion with a solid content of 50-70%; the rubber emulsion includes one of neoprene latex, pre-crosslinked neoprene latex, styrene butadiene latex, and pre-crosslinked styrene butadiene latex. Or multiple.

Preferably, the rubber emulsion is neoprene latex or pre-crosslinked neoprene latex or neoprene latex, pre-crosslinked neoprene latex, styrene butadiene latex, and pre-crosslinked styrene butadiene latex.

Preferably, the solid content of the zinc oxide dispersion is 50-60%; in terms of mass percentage, the zinc oxide dispersion is composed of the following components: 50-60% zinc oxide, 0.5-1.5% sodium bentonite, Sodium hydroxide 0.2~0.4%, sodium methylene dinaphthalene sulfonate 0.3~1.2%, silicone defoamer 0.3~0.5%, the rest is deionized water; the purity of zinc oxide is greater than 99.5%, and the particle size is 2-20 microns.

Preferably, the solid content of the filler slurry is 50-80%; in terms of mass percentage, the filler slurry is composed of the following components: filler 50-80%, sodium bentonite 0.5-1.5%, sodium hydroxide 0.25- 0.35%, polyacrylate ammonium salt dispersant 1.0-2.0%, alkyl polyoxyethylene ether 0.3-1.0%, organosilicon defoamer 0.3-0.5%, and the rest is deionized water.

Preferably, the filler of the filler slurry includes one or more of calcium carbonate, wollastonite, talc, kaolin and mica powder, and the particle size of the filler is between 1250 mesh and 3000 mesh.

Preferably, the sodium silicate content of the sodium silicate aqueous solution is 35%.

Preferably, the antioxidant is a non-polluting phenolic antioxidant 2246.

Preferably, the anti-mildew and antibacterial agent is a mildew-proof and algae-proof zinc pyrithione suspension, and the content of the zinc pyrithione in the zinc pyrithione suspension is 50%.

Preferably, the defoamer is a silicone defoamer.

Preferably, the soluble metal salt free of chloride ions includes divalent and trivalent soluble metal salts free of chloride ions.

Preferably, the soluble metal salt free of chloride ions includes one or more of calcium nitrate, calcium acetate, barium nitrate, barium acetate, and aluminum nitrate.

A preparation method of the above-mentioned spraying quick-setting waterproof coating for marine anti-corrosion, including the following steps:

Step 1): Preparation of zinc oxide dispersion: Under low-speed stirring (300-500r/min), sodium hydroxide is added to deionized water to adjust the pH of the system to between 11-13, and then sodium-based bentonite is added at high-speed (2000-2000r/min). 3000r/min) disperse to uniformity; add dispersant, 1/2 defoamer and zinc oxide under low-speed stirring (500r/min), high-speed (2000-3000r/min) dispersion for 30-40 minutes, and finally add the remaining defoamer;

Step 2): Preparation of filler slurry: Under low-speed stirring (300-500r/min), add sodium hydroxide to the deionized water to adjust the pH of the system to between 11-13, and then add sodium bentonite at high speed (2000-3000r/min) ) Disperse to uniformity; then add dispersant, wetting agent, 1/2 defoamer, filler, anti-aging agent, anti-mildew and bacteriostatic agent under low-speed (500r/min) stirring, and high-speed (2000～3000r/min) dispersion for 30 ~40min, add the remaining 1/2 defoamer at the end; among them, adding anti-aging agent and anti-mold anti-bacterial agent in this step can effectively improve the dispersion effect of anti-aging agent and anti-mold anti-bacterial agent;

Step 3): Preparation of material A: stir the rubber latex and emulsified asphalt at a speed of 500-800r/min, and then add zinc oxide dispersion, filler slurry, sodium silicate aqueous solution, and defoamer in sequence, and stir evenly;

Step 4): Preparation of material B: dissolve the soluble metal salt without chloride ions in deionized water, stir until completely dissolved, and then add ethylene glycol and alkyl polyoxyethylene ether and stir evenly.

A construction method of the above-mentioned spraying quick-setting waterproof coating for marine anti-corrosion is as follows:

After cleaning the base surface, use the above A material to make the primer; then spray A and B materials at the same time, and spray the two fan-shaped atomized surfaces crosswise to form a film quickly; curing and drying.

Preferably, the spraying thickness during the bottoming process of the A material is 0.2 mm; and the spraying thickness during the spraying of the A and B materials is 1.5 to 2.0 mm.

Compared with the prior art, the present invention has the following beneficial effects:

In the present invention, by adding zinc oxide crosslinking agent, sodium silicate, anti-mold and antibacterial agent to material A of the system, and selecting soluble metal salt without chloride ion as coagulant for material B, a chlorine-resistant marine anti-corrosion is prepared. Ion penetration, antibacterial spraying quick-setting rubber asphalt waterproof coating. Among them, the soluble metal salt containing no chloride ion is used as a physical coagulant to make the rubber asphalt mixed emulsion quickly set into a film, which is quick and convenient in construction and does not sag; zinc oxide is used as a chemical crosslinking agent to crosslink with the neoprene latex component, increasing The chemical cross-linking point of the coating film improves the compactness of the coating film, enhances the resistance to chloride ion permeability, water resistance and mechanical properties; sodium silicate component is used as a base surface treatment agent. After the A material is primed, the sodium silicate component Asphalt rubber and other components will infiltrate into the concrete pores at the same time. Sodium silicate can react with cement to block the pores. The asphalt rubber component and the sprayed quick-setting film ensure good interlayer adhesion; bacteriostatic agents can achieve bacteriostasis effect.

In the present invention, neoprene latex, or pre-crosslinked neoprene latex, or neoprene latex, pre-crosslinked neoprene latex, styrene butadiene latex, and pre-crosslinked styrene butadiene latex are used in combination; that is, it must be ensured in the latex formula There are neoprene latex, whether it is uncrosslinked or pre-crosslinked, it can ensure that the latex and zinc oxide are chemically crosslinked, while neoprene latex, pre-crosslinked neoprene latex and styrene butadiene latex, pre-crosslinked butadiene When styrene latex is compounded and used, styrene butadiene latex can improve the low temperature resistance of the coating film. In the prior art CN107043598A, polyisocyanate is used to crosslink the rubber component, and nano-zinc oxide is used for activation. In addition to crosslinking with the rubber component, the polyisocyanate also crosslinks with the organic ammoniums, acids and alcohols in the C component. The essence of its rapid setting is that the polyisocyanate crosslinks with the organic ammoniums, acids and alcohols in the C component. United. However, organic ammoniums, acids, and alcohols are generally low-molecular-weight organic substances, which pollute the environment.

In addition, the zinc oxide used in the present invention is ordinary paint-grade zinc oxide with a smaller particle size, which has a cross-linking effect. It is different from nano-zinc oxide. Ordinary zinc oxide does not have the function of sterilization and mildew resistance. Anti-aging agent, anti-mildew and bacteriostatic agent are added to realize the function of sterilization and anti-mildew of the application.

In addition, the combination of alkyl polyoxyethylene ether and soluble salt without chloride ion is selected in material B of this application, and the addition of alkyl polyoxyethylene ether reduces the rapid setting speed to a certain extent. From the test of rapid setting time experiment It is not easy to observe, because both are instantaneous quick-setting, but it can be seen from the water-out time of the coating film after spraying that the time for the sprayed film without alkyl polyoxyethylene ether to form small water droplets is about 10-15s , The spraying film with alkyl polyoxyethylene ether added the water out time to 25～30s, the water out will be slower, and the water out period will be longer; although the water out is slightly slower, it will not affect the construction and will not cause sagging problems. Ethylene glycol has a higher boiling point of 197.3℃, which has a certain evaporation rate, but it is slower than water, which reduces the drying speed; the combination of alkyl polyoxyethylene ether and ethylene glycol helps to solve the problem of excessive drying of the coating film. Problems such as blistering and cracking of the coating film will soon be caused.

Detailed ways

The following examples illustrate the spraying quick-setting waterproof coating for marine anti-corrosion and its preparation and construction methods.

Since the preparation process and construction methods of zinc oxide dispersion, filler slurry, material A and material B in several implementation cases are the same, this part is only described in detail in implementation case 1, and will not be repeated in other implementation cases.

Implementation case 1:

Spraying quick-setting waterproof coating for marine anticorrosion is composed of materials A and B; among them, material A is composed of the following components: 70# emulsified asphalt 50Kg, neoprene latex 30kg, zinc oxide dispersion 8Kg, filler slurry 13Kg, sodium silicate aqueous solution 1Kg, anti-aging agent 22462Kg, anti-mold and antibacterial agent zinc pyrithione 0.05Kg, organic silicon defoamer 0.2Kg;

Material B consists of the following components: 11Kg of calcium nitrate, 1Kg of ethylene glycol, 0.2Kg of alkyl polyoxyethylene ether, and 87.8Kg of deionized water.

In the first embodiment, the zinc oxide dispersion liquid is composed of the following components: zinc oxide 50Kg, sodium bentonite 0.5Kg, sodium hydroxide 0.03Kg, sodium methylene dinaphthalene sulfonate 0.7Kg, and silicone defoamer 0.4Kg , Deionized water 48.37Kg.

In the first embodiment, the filler slurry is composed of the following components: wollastonite 30Kg, kaolin 40Kg, sodium bentonite 1.0Kg, sodium hydroxide 0.02Kg, polyacrylate ammonium salt 1.5Kg, alkyl polyoxyethylene ether 0.7Kg, Organic silicon defoamer 0.4kg, deionized water 26.88kg.

2. Preparation method

Preparation of zinc oxide dispersion

Under low-speed stirring (300-500r/min), add sodium hydroxide to the deionized water to adjust the pH of the system to between 11-13, then add sodium bentonite, and disperse at high speed (2000-3000r/min) until uniform; low-speed stirring ( Add dispersant, 1/2 defoamer and zinc oxide under 500r/min), disperse at high speed (2000～3000r/min) for 30-40min, and finally add the remaining defoamer.

Preparation of filler slurry

Under low-speed stirring (300-500r/min), add sodium hydroxide to the deionized water to adjust the pH of the system to between 11-13, and then add sodium-based bentonite to disperse at high speed (2000-3000r/min) until uniform; then low-speed (500r/min) /min) Add dispersant, wetting agent, 1/2 defoamer, filler, anti-aging agent 2246, anti-mildew and anti-bacterial agent zinc pyrithione under stirring, and disperse at high speed (2000～3000r/min) for 30～40min, and finally Add the remaining 1/2 defoamer.

Preparation of material A

Stir the chloroprene latex and emulsified asphalt at a speed of 500-800r/min, and then add zinc oxide dispersion, filler slurry, sodium silicate aqueous solution, and defoamer in sequence, and stir evenly.

Preparation of B material

Dissolve calcium nitrate, ethylene glycol, and alkyl polyoxyethylene ether in deionized water, and stir until completely dissolved.

3. Construction method

After the base surface is cleaned, use the above-mentioned material A to make the primer, and spray the thickness of 0.2mm; then spray A and B materials at the same time, and spray the two fan-shaped atomized surfaces crosswise to form a film with a spray thickness of 1.5-2.0mm. It can be cured and dried.

Implementation case two:

In the second embodiment, material A is composed of the following components: 90# emulsified asphalt 40Kg, neoprene latex 30kg, pre-crosslinked styrene butadiene latex 20kg, zinc oxide dispersion 12Kg, filler slurry 5Kg, sodium silicate aqueous solution 2Kg, anti-aging 2246 1.5Kg, anti-mold and antibacterial agent zinc pyrithione 0.07Kg, organic silicon defoamer 0.2Kg;

Material B consists of the following components: 13Kg of calcium acetate, 3Kg of ethylene glycol, 0.3Kg of alkyl polyoxyethylene ether, and 83.7Kg of deionized water.

In the second embodiment, the zinc oxide dispersion is composed of the following components: zinc oxide 60Kg, sodium bentonite 1.2Kg, sodium hydroxide 0.04Kg, sodium methylene dinaphthalene sulfonate 1.2Kg, and silicone defoamer 0.4Kg , Deionized water 37.16Kg.

In the second embodiment, the filler slurry is composed of the following components: calcium carbonate 73g, kaolin 5Kg, sodium bentonite 0.5Kg, sodium hydroxide 0.03Kg, acrylic ammonium salt 2.0Kg, alkyl polyoxyethylene ether 1.0Kg, silicone Antifoaming agent 0.5kg, deionized water 17.97Kg.

Implementation case three:

In the third embodiment, material A is composed of the following components: 90# emulsified asphalt 50Kg, pre-crosslinked neoprene latex 25kg, styrene butadiene latex 10kg, zinc oxide dispersion 8Kg, filler slurry 12Kg, sodium silicate aqueous solution 1.5Kg, Anti-aging agent 2246 2Kg, anti-mildew and antibacterial agent zinc pyrithione 0.05Kg, silicone defoamer 0.15Kg;

Material B consists of the following components: barium nitrate 10Kg, aluminum nitrate 5Kg, ethylene glycol 4.5Kg, alkyl polyoxyethylene ether 0.5Kg, and deionized water 80Kg.

In the third embodiment, the zinc oxide dispersion is composed of the following components: zinc oxide 55Kg, sodium bentonite 1.0Kg, sodium hydroxide 0.03Kg, sodium methylene dinaphthyl sulfonate 1.0Kg, and silicone defoamer 0.3Kg , 42.67Kg of deionized water.

In the third example, the filler slurry is composed of the following components: 60g calcium carbonate, 10Kg mica powder, 1.0Kg sodium bentonite, 0.03Kg sodium hydroxide, 1.8Kg ammonium acrylate, 0.9Kg alkyl polyoxyethylene ether, organic 0.4kg of silicon defoamer and 25.87kg of deionized water.

Implementation case four:

In the fourth embodiment, material A is composed of the following components: 90# emulsified asphalt 40Kg, pre-crosslinked neoprene latex 25kg, pre-crosslinked styrene butadiene latex 15kg, zinc oxide dispersion 8Kg, filler slurry 8Kg, sodium silicate aqueous solution 3Kg, anti-aging agent 2246 2Kg, anti-mold and antibacterial agent zinc pyrithione 0.05Kg, organic silicon defoamer 0.2Kg;

Material B consists of the following components: calcium acetate 7Kg, barium acetate 5Kg, ethylene glycol 2.9Kg, alkyl polyoxyethylene ether 0.1Kg, and deionized water 85Kg.

In the fourth embodiment, the zinc oxide dispersion is composed of the following components: zinc oxide 50Kg, sodium bentonite 0.5Kg, sodium hydroxide 0.03Kg, sodium methylene dinaphthalene sulfonate 0.7Kg, and silicone defoamer 0.4Kg , Deionized water 48.37Kg.

In the fourth embodiment, the filler slurry is composed of the following components: 60g calcium carbonate, 10Kg mica powder, 1.0Kg sodium bentonite, 0.03Kg sodium hydroxide, 1.8Kg ammonium acrylate, 0.9Kg alkyl polyoxyethylene ether, organic 0.4kg of silicon defoamer and 25.87kg of deionized water.

Claims

A spraying quick-setting waterproof coating for marine anti-corrosion, which is characterized in that it is composed of material A and material B, and material A is composed of the following components in terms of mass percentage: emulsified asphalt 40-65%, rubber emulsion 27-50%, oxidation Zinc dispersion 8-20%, filler slurry 5-15%, sodium silicate aqueous solution 0.05-3%, anti-aging agent 1.5-2.5%, anti-mold and bacteriostatic agent 0.03-0.08%, defoaming agent 0.1-0.3%; B The material is composed of the following components in terms of mass percentage: 5-20% of soluble metal salt without chloride ion, 1-5% of ethylene glycol, 0.1-0.5% of alkyl polyoxyethylene ether, and the rest is deionized water.
The spraying quick-setting waterproof coating for marine anti-corrosion according to claim 1, characterized in that: the rubber emulsion is an anionic rubber emulsion with a solid content of 50 to 70%; the rubber emulsion includes neoprene latex, pre-crosslinked One or more of neoprene latex, styrene-butadiene latex, and pre-crosslinked styrene-butadiene latex.
The spraying quick-setting waterproof coating for marine anticorrosion according to claim 1, wherein the solid content of the zinc oxide dispersion is 50-60%; in terms of mass percentage, the zinc oxide dispersion is composed of the following components Composition: 50-60% zinc oxide, 0.5-1.5% sodium bentonite, 0.2-0.4% sodium hydroxide, 0.3-1.2% sodium methylene naphthalene sulfonate, 0.3-0.5% silicone defoamer, and the rest Deionized water.
The spraying quick-setting waterproof coating for marine anticorrosion according to claim 1, characterized in that: the solid content of the filler slurry is 50-80%; in terms of mass percentage, the filler slurry is composed of the following components: filler 50 ～80%, sodium bentonite 0.5～1.5%, sodium hydroxide 0.25～0.35%, polyacrylate ammonium salt dispersant 1.0～2.0%, alkyl polyoxyethylene ether 0.3～1.0%, silicone defoamer 0.3～0.5% , The rest is deionized water.
The spraying quick-setting waterproof coating for marine anticorrosion according to claim 1, wherein the filler of the filler slurry includes one or more of calcium carbonate, wollastonite, talc, kaolin and mica powder.
The spray quick-setting waterproof coating for marine anticorrosion according to claim 1, wherein the anti-mildew and antibacterial agent is a zinc pyrithione suspension, and the content of zinc pyrithione in the zinc pyrithione suspension is Is 50%.
The spray quick-setting waterproof coating for marine anticorrosion according to claim 1, wherein the soluble metal salt free of chloride ions includes divalent and trivalent soluble metal salts free of chloride ions.
A method for preparing the spray quick-setting waterproof coating for marine anti-corrosion according to claim 1, characterized in that it comprises the following steps:

Step 1): Preparation of zinc oxide dispersion: Under low-speed stirring, add sodium hydroxide to the deionized water to adjust the pH of the system to between 11-13, then add sodium bentonite, and disperse at high speed until uniform; then add and disperse under low-speed stirring Anti-foaming agent, 1/2 defoaming agent and zinc oxide, disperse at high speed, and finally adding the remaining defoaming agent;

Step 2): Preparation of filler slurry: Under low-speed stirring, add sodium hydroxide to the deionized water to adjust the pH of the system to between 11-13, and then add sodium-based bentonite to disperse at high speed until uniform; then add dispersant and moisturizer under low-speed stirring Wetting agent, 1/2 defoaming agent, filler, anti-aging agent, anti-mold and bacteriostatic agent, high-speed dispersion, and finally adding the remaining 1/2 defoaming agent;

Step 3): Preparation of material A: stir the rubber latex and emulsified asphalt uniformly, then add zinc oxide dispersion, filler slurry, sodium silicate aqueous solution, and defoamer in sequence, and stir evenly;

Step 4): Preparation of material B: dissolve the soluble metal salt without chloride ions in deionized water, stir until completely dissolved, and then add ethylene glycol and alkyl polyoxyethylene ether and stir evenly.
A construction method of spraying quick-setting waterproof coating for marine anti-corrosion according to claim 1, characterized in that:

After cleaning the base surface, use the above A material to make the primer; then spray A and B materials at the same time, spray the two fan-shaped atomized surfaces crosswise, quickly solidify into a film, and cure and dry.
The construction method of spraying quick-setting waterproof coating for marine anti-corrosion according to claim 9, characterized in that: the spraying thickness during the bottoming process of A material is 0.2mm; and the spraying thickness during the spraying of A and B materials is 1.5~ 2.0mm.