CN111073481A - Preparation method of waterproof coating - Google Patents
Preparation method of waterproof coating Download PDFInfo
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- CN111073481A CN111073481A CN201911417442.5A CN201911417442A CN111073481A CN 111073481 A CN111073481 A CN 111073481A CN 201911417442 A CN201911417442 A CN 201911417442A CN 111073481 A CN111073481 A CN 111073481A
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- C—CHEMISTRY; METALLURGY
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- C09D175/02—Polyureas
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- C08G18/5021—Polyethers having heteroatoms other than oxygen having nitrogen
- C08G18/5024—Polyethers having heteroatoms other than oxygen having nitrogen containing primary and/or secondary amino groups
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- C08G18/67—Unsaturated compounds having active hydrogen
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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Abstract
The invention relates to a preparation method of a waterproof coating, and belongs to the technical field of coatings. The preparation method comprises the following steps: the preparation of modified polyurethane, the preparation of modified acrylic emulsion, the preparation of double components and the like. In the polyurea waterproof coating prepared by the invention, the polyurethane emulsion is modified by cashew nut shell oil polyalcohol, so that the crosslinking between the polyurethane emulsion and epoxy modified resin can be improved, and the adhesive force of the coating is improved. Meanwhile, the epoxy modified polypropylene emulsion used in the method can also obviously improve the corrosion resistance of the coating. The polyurea coating obtained by compounding the two components has higher adhesive force and corrosion resistance.
Description
Technical Field
The invention relates to a preparation method of a waterproof coating, and belongs to the technical field of coatings.
Background
Two-component polyurea preservatives are generally composed of two parts, usually referred to as a curative component and a main component, of an isocyanate prepolymer (also called a low molecular urethane polymer) and a hydroxyl group-containing resin. The paint has a plurality of varieties and wide application range, and can be divided into acrylic polyurethane, alkyd polyurethane, polyester polyurethane, polyether polyurethane, epoxy polyurethane and the like according to the difference of hydroxyl-containing components.
The main application directions are wood coatings, automobile repair coatings, polyurea corrosion prevention, electronic coatings, special coatings, polyurea corrosion prevention and the like. The disadvantages are that the construction process is complex, the requirement on the construction environment is high, and the paint film is easy to generate defects. The single-component polyurea preservative mainly comprises amino ester oil paint, moisture curing polyurea preservative, closed polyurea preservative and the like. The coating has a wider application range than a double-component coating, is mainly used for floor coatings, polyurea anticorrosion, pre-roll coatings and the like, and has less overall performance than the double-component coating. The bi-component polyurea anti-corrosion has the advantages of low film forming temperature, strong adhesive force, good wear resistance, high hardness, good chemical resistance and weather resistance and the like, and can be widely used as industrial protection, wood furniture and automobile coating. The water-based bi-component polyurea anticorrosion combines the high performance of bi-component solvent-based polyurea anticorrosion with the low VOC content of water-based paint, and becomes a research hotspot of the paint industry. The aqueous two-component polyurea anticorrosion material is composed of aqueous polyol containing-OH groups and low-viscosity polyisocyanate curing agent containing-NCO groups, and the performance of a coating film is mainly determined by the composition and the structure of hydroxyl resin. The single-component aqueous polyurea antiseptic is a coating which takes aqueous polyurethane resin as a base material and water as a dispersion medium. The cross-linked modified aqueous polyurea preservative has good storage stability, coating mechanical property, water resistance, solvent resistance and aging resistance, and the performance of the cross-linked modified aqueous polyurea preservative is similar to that of the traditional solvent-based polyurea preservative, so that the cross-linked modified aqueous polyurea preservative is an important development direction of the aqueous polyurea preservative.
However, the polyurea waterproof coating in the prior art has the problem of poor corrosion resistance.
Disclosure of Invention
The purpose of the invention is: the corrosion resistance of the polyurea coating is improved. In the polyurea waterproof coating prepared by the invention, the polyurethane emulsion is modified by cashew nut shell oil polyalcohol, so that the crosslinking between the polyurethane emulsion and epoxy modified resin can be improved, and the adhesive force of the coating is improved. Meanwhile, the epoxy modified polypropylene emulsion used in the method can also obviously improve the corrosion resistance of the coating.
The technical scheme is as follows:
a preparation method of a waterproof coating, wherein the waterproof coating is a polyurea coating, and comprises the following steps:
step one, preparing modified polyurethane: uniformly mixing 15-20 parts of cashew nut shell oil polyol, 15-25 parts of cis-1, 2-cyclohexane diisocyanate, 6-12 parts of organic polybasic acid and 12-15 parts of polybutadiene epoxy resin, adding 1-2 parts of organic tin catalyst, heating to 70-85 ℃, and reacting for 2-4 hours; adding 10-15 parts of organic solvent into the obtained reactant for dilution, adding 2-4 parts of chain extender and 1-3 parts of cross-linking agent, and reacting at 70-80 ℃ for 2-4 hours; cooling the obtained reactant to room temperature, adding 1-2 parts of diethylamine, adding 160-180 parts of water and 5-7 parts of emulsifier, dispersing at a high speed, and distilling under reduced pressure to remove an ester solvent to obtain a modified polyurethane emulsion;
step two, preparing the modified acrylic emulsion: dissolving 12-14 parts by weight of acrylic resin in 3-7 parts by weight of toluene, adding 15-35 parts by weight of water and 1-2 parts by weight of emulsifier, and dispersing at high speed to obtain acrylic resin emulsion; uniformly mixing 2-5 parts of polyethylene glycol, 5-7 parts of epoxy castor oil and 0.2-0.4 part of organic tin catalyst, heating to 60-75 ℃, slowly adding 3-5 parts of E51 epoxy resin, and reacting for 2-4 hours after the addition is finished to obtain a prepolymer; adding 35-45 parts of prepolymer, continuously reacting at 60-65 ℃ for 1-2 hours, cooling to room temperature, adding 60-80 parts of water, and dispersing at high speed to obtain modified epoxy resin emulsion; mixing acrylic resin and modified epoxy resin emulsion, and then dispersing at a high speed to obtain epoxy modified acrylic resin;
adding 45-70 parts of polyether polyol, 17-19 parts of modified polyurethane emulsion, 20-35 parts of epoxy modified acrylic resin and 22-30 parts of ester solvent into a reaction kettle protected by nitrogen, heating to 80-90 ℃ under stirring, performing reduced pressure dehydration and solvent mixing, adding 70-100 parts of polyisocyanate after cooling, performing heating reaction, cooling and discharging to obtain a first component;
and step four, uniformly mixing 35-50 parts of amino-terminated polyether, 10-12 parts of pigment and filler, 2-4 parts of flatting agent, 1-2 parts of anti-ultraviolet agent and 2-4 parts of antioxidant to obtain a second component.
In one embodiment, the organic polyacid is 1, 4-cyclohexanedicarboxylic acid.
In one embodiment, the organotin catalyst is dibutyltin dilaurate.
In one embodiment, the crosslinking agent is trimethylolpropane.
In one embodiment, the organic solvent is selected from one or more of acetone, methyl ethyl ketone, methyl isobutyl ketone, cycloheptanone and cyclohexanone.
In one embodiment, the emulsifier is selected from tween 80.
In one embodiment, the weight ratio between the first component and the second component is 1: 0.4-0.5.
Advantageous effects
In the polyurea waterproof coating prepared by the invention, the polyurethane emulsion is modified by cashew nut shell oil polyalcohol, so that the crosslinking between the polyurethane emulsion and epoxy modified resin can be improved, and the adhesive force of the coating is improved. Meanwhile, the epoxy modified polypropylene emulsion used in the method can also obviously improve the corrosion resistance of the coating.
The polyurea coating obtained by compounding the two components has higher adhesive force and corrosion resistance.
Detailed Description
Example 1
Step one, preparing modified polyurethane: uniformly mixing 15 parts of cashew nut shell oil polyalcohol, 15 parts of cis-1, 2-cyclohexane diisocyanate, 6 parts of 1, 4-cyclohexane dicarboxylic acid and 12 parts of polybutadiene epoxy resin, adding 1 part of dibutyltin dilaurate, heating to 70 ℃, and reacting for 2 hours; adding 10 parts of acetone into the obtained reactant for dilution, adding 2 parts of chain extender and 1 part of trimethylolpropane, and reacting at 70 ℃ for 2 hours; cooling the obtained reactant to room temperature, adding 1 part of diethylamine, then adding 160 parts of water and 805 parts of tween, dispersing at a high speed, and distilling under reduced pressure to remove an ester solvent to obtain a modified polyurethane emulsion;
step two, preparing the modified acrylic emulsion: dissolving 12 parts of acrylic resin in 3 parts of toluene in parts by weight, adding 15 parts of water and 801 parts of tween, and dispersing at a high speed to obtain acrylic resin emulsion; uniformly mixing 2 parts of polyethylene glycol, 5 parts of epoxy castor oil and 0.2 part of dibutyltin dilaurate, heating to 60 ℃, slowly adding 3 parts of E51 epoxy resin, and reacting for 2 hours after the addition is finished to obtain a prepolymer; adding 35 parts of prepolymer, continuously reacting for 1h at 65 ℃, cooling to room temperature, adding 60 parts of water, and dispersing at high speed to obtain modified epoxy resin emulsion; mixing acrylic resin and modified epoxy resin emulsion, and then dispersing at a high speed to obtain epoxy modified acrylic resin;
adding 45 parts of polyether polyol, 17 parts of modified polyurethane emulsion, 20 parts of epoxy modified acrylic resin and 22 parts of butyl acetate into a reaction kettle protected by nitrogen, heating to 80 ℃ under stirring, decompressing, dehydrating and dissolving, cooling, adding 70 parts of polyisocyanate, heating for reaction, cooling, discharging and obtaining a first component;
and step four, uniformly mixing 35 parts of amino-terminated polyether, 10 parts of pigment and filler, 2 parts of flatting agent, 1 part of uvioresistant agent and 2 parts of antioxidant to obtain a second component.
Example 2
Step one, preparing modified polyurethane: uniformly mixing 20 parts of cashew nut shell oil polyalcohol, 25 parts of cis-1, 2-cyclohexane diisocyanate, 12 parts of 1, 4-cyclohexane dicarboxylic acid and 15 parts of polybutadiene epoxy resin, adding 2 parts of dibutyltin dilaurate, heating to 85 ℃, and reacting for 4 hours; adding 15 parts of acetone into the obtained reactant for dilution, adding 4 parts of chain extender and 3 parts of trimethylolpropane, and reacting at 80 ℃ for 4 hours; after the obtained reactant is cooled to room temperature, adding 2 parts of diethylamine, then adding 180 parts of water and 807 parts of tween, dispersing at a high speed, and then distilling under reduced pressure to remove an ester solvent to obtain a modified polyurethane emulsion;
step two, preparing the modified acrylic emulsion: dissolving 14 parts of acrylic resin in 7 parts of toluene in parts by weight, adding 35 parts of water and 802 parts of tween, and dispersing at a high speed to obtain an acrylic resin emulsion; uniformly mixing 5 parts of polyethylene glycol, 7 parts of epoxy castor oil and 0.4 part of dibutyltin dilaurate, heating to 75 ℃, slowly adding 5 parts of E51 epoxy resin, and reacting for 4 hours after the addition is finished to obtain a prepolymer; adding 45 parts of prepolymer, continuously reacting for 2 hours at 60 ℃, cooling to room temperature, adding 80 parts of water, and dispersing at high speed to obtain modified epoxy resin emulsion; mixing acrylic resin and modified epoxy resin emulsion, and then dispersing at a high speed to obtain epoxy modified acrylic resin;
adding 70 parts of polyether polyol, 19 parts of modified polyurethane emulsion, 35 parts of epoxy modified acrylic resin and 30 parts of butyl acetate into a reaction kettle protected by nitrogen, heating to 90 ℃ under stirring, decompressing, dehydrating and dissolving, cooling, adding 100 parts of polyisocyanate, heating for reaction, cooling, discharging to obtain a first component;
and step four, uniformly mixing 50 parts of amino-terminated polyether, 12 parts of pigment and filler, 4 parts of flatting agent, 2 parts of uvioresistant agent and 4 parts of antioxidant to obtain a second component.
Example 3
Step one, preparing modified polyurethane: uniformly mixing 18 parts of cashew nut shell oil polyalcohol, 20 parts of cis-1, 2-cyclohexane diisocyanate, 10 parts of 1, 4-cyclohexane dicarboxylic acid and 13 parts of polybutadiene epoxy resin, adding 1 part of dibutyltin dilaurate, heating to 75 ℃, and reacting for 3 hours; adding 12 parts of acetone into the obtained reactant for dilution, adding 3 parts of chain extender and 2 parts of trimethylolpropane, and reacting at 75 ℃ for 3 hours; cooling the obtained reactant to room temperature, adding 1 part of diethylamine, then adding 170 parts of water and 806 parts of tween, dispersing at a high speed, and distilling under reduced pressure to remove the ester solvent to obtain a modified polyurethane emulsion;
step two, preparing the modified acrylic emulsion: dissolving 13 parts of acrylic resin in 5 parts of toluene in parts by weight, adding 25 parts of water and 801 parts of tween, and dispersing at a high speed to obtain acrylic resin emulsion; uniformly mixing 3 parts of polyethylene glycol, 6 parts of epoxy castor oil and 0.3 part of dibutyltin dilaurate, heating to 65 ℃, slowly adding 4 parts of E51 epoxy resin, and reacting for 3 hours after the addition is finished to obtain a prepolymer; adding 40 parts of prepolymer, continuously reacting for 2 hours at 62 ℃, cooling to room temperature, adding 70 parts of water, and dispersing at high speed to obtain modified epoxy resin emulsion; mixing acrylic resin and modified epoxy resin emulsion, and then dispersing at a high speed to obtain epoxy modified acrylic resin;
adding 60 parts of polyether polyol, 18 parts of modified polyurethane emulsion, 25 parts of epoxy modified acrylic resin and 28 parts of butyl acetate into a reaction kettle protected by nitrogen, heating to 85 ℃ under stirring, decompressing, dehydrating and dissolving, cooling, adding 90 parts of polyisocyanate, heating for reaction, cooling, discharging to obtain a first component;
and step four, uniformly mixing 45 parts of amino-terminated polyether, 11 parts of pigment and filler, 3 parts of flatting agent, 2 parts of uvioresistant agent and 3 parts of antioxidant to obtain a second component.
Comparative example 1
The differences from example 3 are: the acrylic resin is not modified by epoxy resin.
Step one, preparing modified polyurethane: uniformly mixing 18 parts of cashew nut shell oil polyalcohol, 20 parts of cis-1, 2-cyclohexane diisocyanate, 10 parts of 1, 4-cyclohexane dicarboxylic acid and 13 parts of polybutadiene epoxy resin, adding 1 part of dibutyltin dilaurate, heating to 75 ℃, and reacting for 3 hours; adding 12 parts of acetone into the obtained reactant for dilution, adding 3 parts of chain extender and 2 parts of trimethylolpropane, and reacting at 75 ℃ for 3 hours; cooling the obtained reactant to room temperature, adding 1 part of diethylamine, then adding 170 parts of water and 806 parts of tween, dispersing at a high speed, and distilling under reduced pressure to remove the ester solvent to obtain a modified polyurethane emulsion;
step two, preparing the modified acrylic emulsion: dissolving 13 parts of acrylic resin in 5 parts of toluene in parts by weight, adding 25 parts of water and 801 parts of tween, and dispersing at a high speed to obtain acrylic resin emulsion;
adding 60 parts of polyether polyol, 18 parts of modified polyurethane emulsion, 25 parts of acrylic resin emulsion and 28 parts of butyl acetate into a reaction kettle protected by nitrogen, heating to 85 ℃ under stirring, decompressing, dehydrating and dissolving, cooling, adding 90 parts of polyisocyanate, heating for reaction, cooling, discharging to obtain a first component;
and step four, uniformly mixing 45 parts of amino-terminated polyether, 11 parts of pigment and filler, 3 parts of flatting agent, 2 parts of uvioresistant agent and 3 parts of antioxidant to obtain a second component.
Characterization of coating Properties
Using a concrete slab as a substrate at a temperature of 25 ℃ and a relative air humidity of 55%, the weight ratio between the first component and the second component being 1: 0.4 to 0.5, uniformly mixing the coating, adopting spray coating construction according to the dosage of 0.25 kg/square meter, and rolling and coating once according to the same dosage after 24 hours. The performance was tested after 7 days of curing. The results of the measurements are shown in the following table.
As can be seen from the above table, after the polyurea waterproof coating provided by the invention is compounded by the waterborne polyurethane resin using the epoxy modified polyacrylic resin and the cashew nut shell oil polyol, the salt spray corrosion resistance of the polyurea waterproof coating is obviously improved; meanwhile, the anticorrosive paint also has better waterproof performance, and the water-resistant time can reach more than 600 h.
Claims (7)
1. A preparation method of a waterproof coating is characterized by comprising the following steps:
step one, preparing modified polyurethane: uniformly mixing 15-20 parts of cashew nut shell oil polyol, 15-25 parts of cis-1, 2-cyclohexane diisocyanate, 6-12 parts of organic polybasic acid and 12-15 parts of polybutadiene epoxy resin, adding 1-2 parts of organic tin catalyst, heating to 70-85 ℃, and reacting for 2-4 hours; adding 10-15 parts of organic solvent into the obtained reactant for dilution, adding 2-4 parts of chain extender and 1-3 parts of cross-linking agent, and reacting at 70-80 ℃ for 2-4 hours; cooling the obtained reactant to room temperature, adding 1-2 parts of diethylamine, adding 160-180 parts of water and 5-7 parts of emulsifier, dispersing at a high speed, and distilling under reduced pressure to remove an ester solvent to obtain a modified polyurethane emulsion;
step two, preparing the modified acrylic emulsion: dissolving 12-14 parts by weight of acrylic resin in 3-7 parts by weight of toluene, adding 15-35 parts by weight of water and 1-2 parts by weight of emulsifier, and dispersing at high speed to obtain acrylic resin emulsion; uniformly mixing 2-5 parts of polyethylene glycol, 5-7 parts of epoxy castor oil and 0.2-0.4 part of organic tin catalyst, heating to 60-75 ℃, slowly adding 3-5 parts of E51 epoxy resin, and reacting for 2-4 hours after the addition is finished to obtain a prepolymer; adding 35-45 parts of prepolymer, continuously reacting at 60-65 ℃ for 1-2 hours, cooling to room temperature, adding 60-80 parts of water, and dispersing at high speed to obtain modified epoxy resin emulsion; mixing acrylic resin and modified epoxy resin emulsion, and then dispersing at a high speed to obtain epoxy modified acrylic resin;
adding 45-70 parts of polyether polyol, 17-19 parts of modified polyurethane emulsion, 20-35 parts of epoxy modified acrylic resin and 22-30 parts of ester solvent into a reaction kettle protected by nitrogen, heating to 80-90 ℃ under stirring, performing reduced pressure dehydration and solvent mixing, adding 70-100 parts of polyisocyanate after cooling, performing heating reaction, cooling and discharging to obtain a first component;
and step four, uniformly mixing 35-50 parts of amino-terminated polyether, 10-12 parts of pigment and filler, 2-4 parts of flatting agent, 1-2 parts of anti-ultraviolet agent and 2-4 parts of antioxidant to obtain a second component.
2. The method of claim 1, wherein the organic polyacid is 1, 4-cyclohexanedicarboxylic acid.
3. The method of preparing a water resistant coating according to claim 1 wherein, in one embodiment, the organotin catalyst is dibutyltin dilaurate.
4. The method of claim 1, wherein the cross-linking agent is trimethylolpropane in one embodiment.
5. The method of claim 1, wherein the organic solvent is selected from acetone, methyl ethyl ketone, methyl isobutyl ketone, cycloheptanone, and cyclohexanone.
6. The method of claim 1, wherein the emulsifier is tween 80.
7. The method of preparing a waterproof coating material according to claim 1, wherein, in one embodiment, the weight ratio between the first component and the second component is 1: 0.4-0.5.
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| CN (1) | CN111073481A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112175452A (en) * | 2020-10-17 | 2021-01-05 | 温州国微科技有限公司 | Motorcycle brake pedal and processing technology thereof |
| CN112322162A (en) * | 2020-11-11 | 2021-02-05 | 惠州市惠阳区嘉泰涂料有限公司 | Polyurea coating and preparation method thereof |
-
2019
- 2019-12-31 CN CN201911417442.5A patent/CN111073481A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112175452A (en) * | 2020-10-17 | 2021-01-05 | 温州国微科技有限公司 | Motorcycle brake pedal and processing technology thereof |
| CN112175452B (en) * | 2020-10-17 | 2022-05-06 | 温州国微科技有限公司 | Motorcycle brake pedal and processing technology thereof |
| CN112322162A (en) * | 2020-11-11 | 2021-02-05 | 惠州市惠阳区嘉泰涂料有限公司 | Polyurea coating and preparation method thereof |
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