Multi-component coating with waterproof function and production process thereof

Abstract

The invention belongs to the technical field of coatings, and discloses a waterproof multi-component coating and a production process thereof, the waterproof multi-component coating comprises the following raw materials by weight: 30-50 parts of methyl methacrylate, 20-35 parts of butyl acrylate, 15-20 parts of 2-ethylhexyl acrylate, 10-15 parts of acrylic acid, 10-20 parts of hydroxyethyl methylacrylate, 8-15 parts of a functional modified monomer, and 2-6 parts of a filler. 1-5 parts of triethylamine, 2-5 parts of an emulsifier, 30-40 parts of an initiator, 1-3 parts of sodium bicarbonate and 40-55 parts of deionized water; the prepared multi-component coating has good waterproof and anti-corrosion performance, is resistant to scrubbing and wide in application range, and can be applied to the fields of metal roof waterproofing, waterproof coiled materials or metal electronic devices and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and in particular relates to a multi-component coating with waterproof functionality and a production process thereof. Background Art

[0002] Waterborne acrylic emulsions are formed by copolymerizing vinyl-containing hydroxyethyl methacrylate, (meth)acrylate, and vinyl acetate monomers. By selecting different raw materials, initiators, emulsifiers, and production processes, waterborne acrylic emulsions with different properties and uses can be synthesized.

[0003] Conventional water-based acrylic coatings still have shortcomings in terms of water resistance, chemical resistance, and heat resistance, hindering their application in certain high-performance, demanding applications. Therefore, they are often modified to produce high-performance water-based acrylic resins, expanding their application range and fields. Modified acrylic coatings offer excellent film-forming properties, transparency, adhesion, mechanical strength, and weather resistance, making them suitable as base materials for water-based coatings. They are one of the most versatile and widely used emulsion coatings, finding widespread application in waterproof and anti-corrosion coatings, architectural coatings, and wood finishes.

[0004] Waterborne acrylic emulsions are usually modified by grafting, copolymerization, core-shell, crosslinking, and blending. Among these modification methods, functional monomer modification is widely used, easy to operate, and has significant effects.

[0005] Metal electronic components are essential components of electronic or electromechanical equipment. These components come in a wide variety of styles and are relatively small, often scattered throughout electronic devices. Most metal electronic components are susceptible to oxidation and corrosion if exposed to water during use, leading to degradation and impacting the quality and lifespan of the equipment. Therefore, metal electronic components require a coating that insulates them from water and air, ideally with water-resistant and anti-oxidative corrosion properties, to ensure long-term performance. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-component coating with waterproof functionality and a production process thereof.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A multi-component coating with waterproof functionality, comprising the following raw materials in parts by weight: 30-50 parts of methyl methacrylate, 20-35 parts of butyl acrylate, 15-20 parts of isooctyl acrylate, 10-15 parts of acrylic acid, 10-20 parts of hydroxyethyl methacrylate, 8-15 parts of functional modification monomer, 2-6 parts of filler, 1-5 parts of triethylamine, 2-5 parts of emulsifier, 30-40 parts of initiator, 1-3 parts of sodium bicarbonate, and 40-55 parts of deionized water;

[0009] The structural formula of the functional modified monomer is:

[0010]

[0011] Furthermore, the preparation method of the functional modified monomer is:

[0012] 1.5-1.6 g of 2-amino-5-(trifluoromethyl)pyridine, 0.5-0.7 g of sodium hydroxide, 5-10 ml of triethylamine and 100-150 ml of acetonitrile solvent were weighed in sequence and added to a reaction flask containing a nitrogen protection device. Nitrogen was introduced for 3-5 minutes to exclude air from the reaction flask. The temperature was raised to 80-85° C. while stirring. Then, 1.8-2.0 g of 11-chloro-1-undecene was added dropwise. After the addition was completed, the reaction was kept warm for 4-6 hours, 20-30 ml of water was added for quenching, and the mixture was naturally cooled to room temperature. The liquid was separated, the organic phase was collected, the solvent was removed by rotary evaporation, anhydrous ethanol was added for recrystallization, and the functional modified monomer was obtained after filtration and drying.

[0013] Furthermore, the filler is one of mica powder, talcum powder and shell powder.

[0014] Furthermore, the emulsifier is emulsifier SE-10 or emulsifier NP-10.

[0015] Furthermore, the initiator is a potassium persulfate aqueous solution with a mass fraction of 8-10%.

[0016] A production process for a multi-component coating with waterproof functionality comprises the following steps:

[0017] S1. Weigh 1.5-2.5 parts of an emulsifier and 20-30 parts of deionized water, mix and stir for 15-20 minutes, then add 20-35 parts of methyl methacrylate, 15-20 parts of butyl acrylate, 10-12 parts of isooctyl acrylate, 8-10 parts of acrylic acid, and 8-15 parts of hydroxyethyl methacrylate, and stir for pre-emulsification for 20-25 minutes to obtain an acrylate pre-emulsion;

[0018] S2, weigh 0.5-2.5 parts of emulsifier, 1-3 parts of sodium bicarbonate and 20-25 parts of deionized water, add them to the reaction apparatus, introduce nitrogen for 15-20 minutes, then add 10-15 parts of methyl methacrylate, 5-15 parts of butyl acrylate, 5-8 parts of isooctyl acrylate, 2-5 parts of acrylic acid, 2-5 parts of hydroxyethyl methacrylate, 8-15 parts of functional modification monomer, mix and stir evenly, heat for the first time, emulsify quickly for 10-15 minutes, heat for the second time, add 12-15 parts of initiator drop by drop, After the addition is completed, the temperature is raised for the third time, and the reaction is kept warm for 40-60 minutes. Then, the acrylate pre-emulsion prepared in step S1 and 15-20 parts of initiator are added within 2-3 hours. After the addition is completed, the reaction is continued for 40-60 minutes. 2-6 parts of filler are added, and 3-5 parts of initiator are continued to be added. The reaction is then kept warm for 40-60 minutes. After the reaction is completed, heating is stopped, and stirring is continued to cool naturally to room temperature. 1-5 parts of triethylamine are added to adjust the pH of the solution to weak alkalinity. The material is filtered to obtain a multi-component coating with waterproof functionality.

[0019] Furthermore, the temperature of the first heating is 45-50°C.

[0020] Furthermore, the temperature of the second heating is 60-65°C.

[0021] Furthermore, the temperature of the third heating is 70-75°C.

[0022] Furthermore, in step S2, the weak alkalinity is a pH of 7.5-8.0.

[0023] Beneficial effects of the present invention:

[0024] The present invention provides a multi-component coating with waterproof functionality. Components methyl methacrylate, butyl acrylate, isooctyl acrylate, acrylic acid, hydroxyethyl methacrylate and a functional modification monomer are copolymerized to obtain a modified acrylate emulsion. Compared with the prior art in which a waterproof functional additive is added separately, the functional modification monomer is linked to the acrylate emulsion by chemical bonds. The functional modification monomer of the present application has multiple hydrophobic functional groups including a long fatty chain, a trifluoromethyl group and a pyridine ring, which greatly improves the water resistance of the acrylate emulsion and avoids the compatibility problem of adding the waterproof functional additive separately. The monomer is not easy to precipitate, and the coating prepared therefrom has a lower surface energy of the coating film, thereby increasing the hydrophobicity of the coating. In addition, the iminopyridine structure contains lone pairs of electrons, which can be combined with atoms on the metal surface in the form of coordination bonds, resulting in adsorption to form a protective layer, further isolating water and air, and greatly improving the waterproof and anti-corrosion properties of the coating.

[0025] The multi-component coating prepared in this application has good waterproof and anti-corrosion properties, is washable, and has a wide range of applications. It can be used in metal roof waterproofing, waterproof membranes, or metal electronic devices and other fields.

[0026] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 is the H NMR spectrum of the functional modified monomer M;

[0029] Figure 2 As shown, a is the infrared spectrum of the coating prepared in Comparative Example 1, and b is the infrared spectrum of the coating prepared in Example 4. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] Example 1, the preparation method of the functional modified monomer is:

[0032] 1.5 g of 2-amino-5-(trifluoromethyl)pyridine, 0.6 g of sodium hydroxide, 10 ml of triethylamine, and 150 ml of acetonitrile solvent were weighed in sequence and added to a reaction flask containing a nitrogen protection device. Nitrogen was introduced for 5 minutes to exclude air from the reaction flask. The temperature was raised to 80° C. while stirring. Then, 2.0 g of 11-chloro-1-undecene was added dropwise. After the addition was completed, the reaction was kept warm for 5 hours. 25 ml of water was added for quenching, and the mixture was naturally cooled to room temperature. The liquids were separated, the organic phase was collected, the solvent was removed by rotary evaporation, anhydrous ethanol was added for recrystallization, and the functional modified monomer represented by Formula M was obtained after filtration and drying.

[0033]

[0034] like Figure 1 Shown is the H NMR spectrum of the functional modified monomer M, and the test results are:

[0035] 1H NMR (400MHz, CDCl3): δ8.21(s,1H),7.34(d,J=8.0Hz,1H),6.78(d,J=12.0Hz,1H),5.46(t,J=8.0 Hz, 1H), 5.19 (d, J = 8.0 Hz, 2H), 4.16 (t, 1H), 3.24 (m, 2H), 2.88 (m, 2H), 2.70 (m, 2H), 2.48 (m, 12H).

[0036] Example 2, a production process of a multi-component coating with waterproof functionality is as follows:

[0037] S1. Weigh 2 parts of emulsifier and 25 parts of deionized water, mix and stir for 20 minutes, then add 25 parts of methyl methacrylate, 15 parts of butyl acrylate, 12 parts of isooctyl acrylate, 10 parts of acrylic acid, and 10 parts of hydroxyethyl methacrylate, and stir for pre-emulsification for 20 minutes to obtain an acrylate pre-emulsion;

[0038] Weigh 2 parts of emulsifier, 1.5 parts of sodium bicarbonate and 25 parts of deionized water and add them to the reaction apparatus. Nitrogen is introduced for 20 minutes. Then, 10 parts of methyl methacrylate, 10 parts of butyl acrylate, 6 parts of isooctyl acrylate, 4 parts of acrylic acid, 4 parts of hydroxyethyl methacrylate, and 8 parts of functional modified monomer are added and mixed and stirred evenly. The temperature is raised to 50°C for the first time and quickly emulsified for 10 minutes. The temperature is raised to 65°C for the second time and 12 parts of initiator are added dropwise. After the addition is complete, the temperature is raised to 70°C for the third time and the reaction is kept warm for 50 minutes. Then, the acrylate pre-emulsion prepared in step S1 and 20 parts of initiator are added within 2 hours. After the addition is complete, the reaction is continued to be kept warm for 50 minutes. 3 parts of filler are added, and 5 parts of initiator are added. Then, the reaction is kept warm for 60 minutes. After the reaction is completed, heating is stopped, stirring is continued and the solution is naturally cooled to room temperature. 3 parts of triethylamine are added to adjust the pH of the solution to 7.6. The discharge is filtered to obtain a multi-component coating with waterproof functionality.

[0039] The filler is mica powder;

[0040] The emulsifier is emulsifier SE-10;

[0041] The initiator is a 10% by mass potassium persulfate aqueous solution;

[0042] The functional modified monomer is prepared in Example 1.

[0043] Example 3, a production process of a multi-component coating with waterproof functionality is as follows:

[0044] S1. Weigh 1.5 parts of emulsifier and 20 parts of deionized water, mix and stir for 20 minutes, then add 30 parts of methyl methacrylate, 18 parts of butyl acrylate, 10 parts of isooctyl acrylate, 8 parts of acrylic acid, and 9 parts of hydroxyethyl methacrylate, and stir for pre-emulsification for 25 minutes to obtain an acrylate pre-emulsion;

[0045] Weigh 2 parts of emulsifier, 1.5 parts of sodium bicarbonate and 25 parts of deionized water and add them to the reaction apparatus, introduce nitrogen for 20 minutes, then add 12 parts of methyl methacrylate, 7 parts of butyl acrylate, 7 parts of isooctyl acrylate, 3 parts of acrylic acid, 4 parts of hydroxyethyl methacrylate, and 10 parts of functional modified monomer, mix and stir evenly, heat to 45°C for the first time, quickly emulsify for 15 minutes, heat to 60°C for the second time, add 15 parts of initiator dropwise, after the addition is complete, heat to 75°C for the third time, keep warm for 40 minutes, then add the acrylate pre-emulsion prepared in step S1 and 18 parts of initiator within 2 hours, after the addition is complete, continue to keep warm for 40 minutes, add 5 parts of filler, continue to add 5 parts of initiator, then keep warm for 40 minutes, after the reaction is completed, stop heating, continue stirring and cool naturally to room temperature, add 4 parts of triethylamine to adjust the pH of the solution to 7.7, filter the discharge, and obtain a multi-component coating with waterproof functionality.

[0046] The filler is talcum powder;

[0047] The emulsifier is emulsifier SE-10;

[0048] The initiator is an aqueous solution of potassium persulfate with a mass fraction of 8%;

[0049] The functional modified monomer is prepared in Example 1.

[0050] Example 4, a production process of a multi-component coating with waterproof functionality is as follows:

[0051] S1. Weigh 2.5 parts of emulsifier and 30 parts of deionized water, mix and stir for 15 minutes, then add 35 parts of methyl methacrylate, 15 parts of butyl acrylate, 11 parts of isooctyl acrylate, 10 parts of acrylic acid, and 15 parts of hydroxyethyl methacrylate, and stir for pre-emulsification for 25 minutes to obtain an acrylate pre-emulsion;

[0052] Weigh 2.5 parts of emulsifier, 3 parts of sodium bicarbonate and 25 parts of deionized water and add them to the reaction apparatus. Nitrogen is introduced for 20 minutes. Then, 10 parts of methyl methacrylate, 15 parts of butyl acrylate, 5 parts of isooctyl acrylate, 5 parts of acrylic acid, 5 parts of hydroxyethyl methacrylate, and 15 parts of functional modified monomer are added and mixed and stirred evenly. The temperature is raised to 50°C for the first time and quickly emulsified for 15 minutes. The temperature is raised to 60°C for the second time and 14 parts of initiator are added dropwise. After the addition is complete, the temperature is raised to 75°C for the third time and the reaction is kept warm for 60 minutes. Then, the acrylate pre-emulsion prepared in step S1 and 19 parts of initiator are added within 3 hours. After the addition is complete, the reaction is continued for 50 minutes. 6 parts of filler are added, and 5 parts of initiator are added. Then, the reaction is kept warm for 60 minutes. After the reaction is completed, heating is stopped, stirring is continued and the solution is naturally cooled to room temperature. 5 parts of triethylamine are added to adjust the pH of the solution to 7.9. The discharge is filtered to obtain a multi-component coating with waterproof functionality.

[0053] The filler is shell powder;

[0054] The emulsifier is emulsifier NP-10;

[0055] The initiator is a 10% by mass potassium persulfate aqueous solution;

[0056] The functional modified monomer is prepared in Example 1.

[0057] In Comparative Example 1, no functional modification monomer was added, and the rest was the same as in Example 4.

[0058] like Figure 2 As shown, a is the infrared spectrum of the coating prepared in Comparative Example 1, and b is the infrared spectrum of the coating prepared in Example 4; as shown in the figure, 1742 cm -1 The -C=O stretching vibration absorption peak on the ester group is 2958cm -1 and 2875cm -1 The -CH3 and -CH2- stretching vibration absorption peaks are different. The 3100-3700 cm -1 The broad peak in the range also includes the NH stretching vibration absorption peak, 3045cm -1 The peak at 1627 cm is the CH stretching vibration peak on the pyridine ring. -1 The peak at the C=N stretching vibration of the pyridine ring indicates that the functional modified monomer participates in the copolymerization reaction and exists in the acrylic emulsion coating in the form of chemical bonds.

[0059] The coatings in Examples 2-4 and Comparative Example 1 were tested for performance, and the results are shown in the following table:

[0060] The coatings in Examples 2-4 and Comparative Example 1 were sprayed onto steel plates respectively and dried at 180° C. for 15 minutes. The coating thickness was 80 μm.

[0061]

[0062]

[0063] Note: The salt spray resistance test method is to use a grid tool to scratch the surface of the sample paint film, place the sample at a 20° angle in the salt spray chamber, and observe the blistering on the surface of the sample paint film after 2000 hours.

[0064] As can be seen from the above table, the waterproof coatings prepared in Examples 2-4 have a high contact angle and good hydrophobic properties. The possible reason is that the copolymer links the functional modified monomers, in which the long fatty chains, trifluoromethyl groups and pyridine rings have low surface energy, which makes the coating have good waterproof properties; in addition, the iminopyridine structure contains lone pairs of electrons, which can be combined with the atoms on the metal surface in the form of coordination bonds, resulting in adsorption to form a protective layer, further isolating water and air, and greatly improving the waterproof and anti-corrosion properties of the coating.

[0065] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A multi-component coating with waterproof functionality, characterized in that: The invention comprises the following raw materials in parts by weight: 30-50 parts of methyl methacrylate, 20-35 parts of butyl acrylate, 15-20 parts of isooctyl acrylate, 10-15 parts of acrylic acid, 10-20 parts of hydroxyethyl methacrylate, 8-15 parts of functional modification monomer, 2-6 parts of filler, 1-5 parts of triethylamine, 2-5 parts of emulsifier, 30-40 parts of initiator, 1-3 parts of sodium bicarbonate, and 40-55 parts of deionized water; The structural formula of the functional modified monomer is:

2. The multi-component coating with waterproof functionality according to claim 1, characterized in that: The preparation method of the functional modified monomer is as follows: 1.5-1.6 g of 2-amino-5-(trifluoromethyl)pyridine, 0.5-0.7 g of sodium hydroxide, 5-10 ml of triethylamine and 100-150 ml of acetonitrile solvent were weighed in sequence and added to a reaction flask containing a nitrogen protection device. Nitrogen was introduced for 3-5 minutes to exclude air from the reaction flask. The temperature was raised to 80-85° C. while stirring. Then, 1.8-2.0 g of 11-chloro-1-undecene was added dropwise. After the addition was completed, the reaction was kept warm for 4-6 hours, 20-30 ml of water was added for quenching, and the mixture was naturally cooled to room temperature. The liquid was separated, the organic phase was collected, the solvent was removed by rotary evaporation, anhydrous ethanol was added for recrystallization, and the functional modified monomer was obtained after filtration and drying.

3. The multi-component coating with waterproof functionality according to claim 1, characterized in that: The filler is one of mica powder, talcum powder and shell powder.

4. The multi-component coating with waterproof functionality according to claim 1, characterized in that: The emulsifier is emulsifier SE-10 or emulsifier NP-10.

5. The multi-component coating with waterproof functionality according to claim 1, characterized in that: The initiator is a potassium persulfate aqueous solution with a mass fraction of 8-10%.

6. A process for producing a multi-component coating with waterproof functionality as claimed in claim 1, characterized in that: The following steps are involved: S1. Weigh 1.5-2.5 parts of an emulsifier and 20-30 parts of deionized water, mix and stir for 15-20 minutes, then add 20-35 parts of methyl methacrylate, 15-20 parts of butyl acrylate, 10-12 parts of isooctyl acrylate, 8-10 parts of acrylic acid, and 8-15 parts of hydroxyethyl methacrylate, and stir for pre-emulsification for 20-25 minutes to obtain an acrylate pre-emulsion; S2, weigh 0.5-2.5 parts of emulsifier, 1-3 parts of sodium bicarbonate and 20-25 parts of deionized water, add them to the reaction apparatus, introduce nitrogen for 15-20 minutes, then add 10-15 parts of methyl methacrylate, 5-15 parts of butyl acrylate, 5-8 parts of isooctyl acrylate, 2-5 parts of acrylic acid, 2-5 parts of hydroxyethyl methacrylate, 8-15 parts of functional modification monomer, mix and stir evenly, heat for the first time, emulsify quickly for 10-15 minutes, heat for the second time, add 12-15 parts of initiator drop by drop, After the addition is completed, the temperature is raised for the third time, and the reaction is kept warm for 40-60 minutes. Then, the acrylate pre-emulsion prepared in step S1 and 15-20 parts of initiator are added within 2-3 hours. After the addition is completed, the reaction is continued for 40-60 minutes. 2-6 parts of filler are added, and 3-5 parts of initiator are continued to be added. The reaction is then kept warm for 40-60 minutes. After the reaction is completed, heating is stopped, and stirring is continued to cool naturally to room temperature. 1-5 parts of triethylamine are added to adjust the pH of the solution to weak alkalinity. The material is filtered to obtain a multi-component coating with waterproof functionality.

7. The production process of a multi-component coating with waterproof functionality according to claim 6, characterized in that: The temperature of the first heating is 45-50°C.

8. The process for producing a multi-component coating with waterproof functionality according to claim 6, characterized in that: The temperature of the second heating is 60-65°C.

9. The production process of a multi-component coating with waterproof functionality according to claim 6, characterized in that: The temperature of the third heating is 70-75°C.

10. The production process of a multi-component coating with waterproof functionality according to claim 6, characterized in that: In step S2, the weak alkalinity is a pH of 7.5-8.0.

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