Impact-resistant and corrosion-resistant isocyanate / silicate coating and preparation method thereof

Abstract

The invention discloses an impact-resistant and corrosion-resistant isocyanate / silicate coating and a preparation method thereof. The coating is prepared from the following components in parts by weight: 30 to 90 parts of isocyanate resin, 10 to 50 parts of silicate, 0.5 to 1 part of silane coupling agent, 0.5 to 1 part of organic ester, 0.5 to 1 part of defoaming agent, 0.5 to 1 part of thickening agent, 0.5 to 1 part of dispersing agent, 15 to 40 parts of pigment filler and 5 to 10 parts of solvent. The isocyanate / silicate coating with both acid corrosion resistance and impact resistance is prepared by a one-step preparation method. The modified silicate and the isocyanate resin react to form a high-solid-content three-dimensional network structure, and the dense three-dimensional network structure hinders permeation of a corrosive medium, so that the impact resistance, corrosion resistance and other properties of the isocyanate resin are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of impact-resistant and corrosion-resistant coatings, and in particular to an impact-resistant and corrosion-resistant isocyanate / silicate coating and a preparation method thereof. Background Art

[0002] In the fields of petrochemicals, electric power, shipbuilding, aerospace, etc., serious metal corrosion problems are prevalent. In response to different corrosive environments, some corrosion-resistant materials can be used, such as high-nickel alloy materials such as incoloy800, incoloy600, incoloy718, incoloy800H, or organic coatings with anti-corrosion properties. Among them, applying organic coatings is an economical, efficient and simple means of protection. Isocyanate organic resins are widely used in the field of material protection due to their excellent corrosion resistance, chemical resistance, strong adhesion and plasticity. In order to improve the corrosion resistance of the coating, modifying the isocyanate resin and increasing the content of corrosion-resistant media in the coating is an effective means. The increase of corrosion-resistant media will directly prolong the path and time for the corrosive media to enter the substrate. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the present invention provides an impact-resistant and corrosion-resistant isocyanate / silicate coating and a preparation method thereof.

[0004] According to a first aspect of the present invention, the present invention discloses an impact-resistant and corrosion-resistant isocyanate / silicate coating comprising the following components in parts by weight:

[0005] 30-90 parts of isocyanate organic resin, 10-50 parts of silicate, 0.5-1.8 parts of modifier, 0.5-1 part of organic ester, 0.5-1 part of defoamer, 0.5-1 part of thickener, 0.5-1 part of film-forming aid, 0.5-1 part of leveling agent, 0.5-1 part of dispersant, 15-40 parts of pigment and filler, and 5-10 parts of solvent.

[0006] The silicate of the present invention needs to be chemically modified by covalent bonds. The silicate has carboxyl groups and hydroxyl groups, which can be grafted onto the isocyanate organic resin by covalent bond modification.

[0007] The modifier of the present invention needs to be hydrolyzed.

[0008] The modifier, deionized water and anhydrous ethanol are mixed in a ratio of 1:3:6 to prepare a hydrolysis solution.

[0009] During the hydrolysis process of the modifier described in the present invention, the mixture is mixed by adding the mixture in batches. First, deionized water and anhydrous ethanol are mixed at a stirring speed of 800 rpm. During the mixing process, the silane coupling agent is slowly added dropwise, the pH of the solution is adjusted, and stirring is continued for 4 hours.

[0010] In the modification process of the present invention, the modifier is added to the silicate solution in a dropwise manner at a dropwise addition rate of 0.4-0.6 g / min, and the mixture is mixed and stirred at a rotation speed of 800 rpm for 20 minutes.

[0011] The silicate of the present invention can be selected from sodium silicate and potassium silicate.

[0012] The pigment filler of the present invention can be one of titanium dioxide, carbon black, iron oxide, phthalocyanine blue, organic yellow and organic red.

[0013] The auxiliary agent of the present invention is added dropwise, and the speed of addition is controlled at 0.4-0.8 g / min.

[0014] During the mixing process of the silicate-modified isocyanate organic resin of the present invention, the stirring speed is controlled to be 700-800 rpm and the stirring time is 20-30 minutes.

[0015] The present invention comprises:

[0016] Under normal temperature and pressure, the hydrolyzed modifier is added to the silicate solution in a specific ratio and mixed to obtain solution A.

[0017] The component A solution and the isocyanate organic resin are uniformly mixed in a certain mass ratio, and organic ester, defoamer, dispersant, thickener and pigment filler are added to the mixed solution while drying at room temperature and pressure.

[0018] In the present invention, a more functionalized resin is formed by grafting the chemically modified silicate onto the isocyanate organic resin. DETAILED DESCRIPTION

[0019] The following describes various embodiments of the present invention. For clarity, many practical details are included in the following description. However, it should be understood that these practical details are not intended to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not essential.

[0020] The invention will be further described below in conjunction with specific implementations.

[0021] Example 1

[0022] Under normal temperature and pressure drying conditions, an inorganic silicate is covalently modified using a modifier. 0.5 parts of the modifier and 30 parts of the silicate are mixed evenly to obtain a modified silicate solution for use. 50 parts of an isocyanate resin and 0.5 parts of an organic ester are added, and 5 parts of a solvent are stirred evenly to obtain a mixed solution of the isocyanate and organic ester. Subsequently, 0.5 parts each of a foaming agent, a thickener, a film-forming aid, a leveling agent, and a dispersant are removed, and 5, 10, 5, 10, and 30 parts of the modified silicate solution of a pigment and filler, titanium dioxide, carbon black, iron oxide, and phthalocyanine blue are added, respectively. Mechanical stirring is performed at 800 rpm for 30 minutes to prepare an impact-resistant and corrosion-resistant isocyanate / silicate coating.

[0023] Table 1 Main performance parameters of impact-resistant and corrosion-resistant isocyanate / silicate coating of Example 1

[0024] Coating hardness 3-4H impact resistance 85kg*cm Salt spray resistance 1000h Adhesion 15-20MPa Bending resistance 0mm Friction and wear resistance 0.17g

[0025] Example 2

[0026] Under normal temperature and pressure drying conditions, an inorganic silicate is covalently modified using a modifier. One part of the modifier and 40 parts of the silicate are mixed evenly to obtain a modified silicate solution for use. 50 parts of an isocyanate resin and 0.5 parts of an organic ester are added to 5 parts of a solvent and stirred evenly to obtain a mixed solution of the isocyanate and organic ester. Subsequently, 0.5 parts each of a foaming agent, a thickener, a film-forming aid, a leveling agent, and a dispersant are removed, and 5, 10, 5, 10, and 40 parts of the modified silicate solution are added to the pigment and filler, titanium dioxide, carbon black, iron oxide, and phthalocyanine blue, respectively. Mechanical stirring is performed at 800 rpm for 30 minutes to produce an impact-resistant and corrosion-resistant isocyanate / silicate coating.

[0027] Table 2 Main performance parameters of impact-resistant and corrosion-resistant isocyanate / silicate coating of Example 2

[0028] Coating hardness 3-4H impact resistance 100kg*cm Salt spray resistance 1000h Adhesion 10-15MPa Bending resistance 0mm Friction and wear resistance 0.22g

[0029] In order to illustrate the role of silicate in isocyanate resin impact-resistant and corrosion-resistant coatings, the present invention made a group of coatings without silicate for comparison and tested their main properties. The examples and test results are as follows:

[0030] Comparative Example 1

[0031] Under normal temperature and pressure drying conditions, 50 parts of isocyanate resin, 0.5 parts each of defoamer, thickener, film-forming aid, leveling agent, and dispersant, and 5, 10, 5, and 10 parts of pigment and filler titanium dioxide, carbon black, iron oxide, and phthalocyanine blue were taken, and mechanically stirred at 800 rpm for 30 minutes to prepare an isocyanate coating.

[0032] Table 3 Main performance parameters of comparative example 1 inorganic water-based high temperature corrosion resistant silicone resin coating

[0033]

[0034]

[0035] A comparison of the key performance parameters of the two corrosion-resistant isocyanate resin coatings above shows that the modified isocyanate / silicate corrosion-resistant coating exhibits superior hardness, impact resistance, salt spray resistance, friction and wear resistance, and significant advantages in bending resistance compared to pure isocyanate resin coatings. This demonstrates that the added silicate has played a role in improving all aspects of the coating's performance.

[0036] The impact-resistant and corrosion-resistant modified isocyanate / silicate resin coating prepared by the present invention forms a coating on the surface of a substrate. The silicate filler in the coating significantly improves the coating's wear resistance, corrosion resistance, impact resistance, and bending resistance. The modified silicate reacts with the isocyanate resin to form a high-solids three-dimensional network structure. This dense structure hinders the penetration of corrosive media, thereby enhancing the isocyanate resin's impact resistance and corrosion resistance.

Claims

1. An impact-resistant and corrosion-resistant isocyanate / silicate coating, characterized in that: The composition comprises the following components in parts by weight: 30-90 parts of isocyanate organic resin, 10-50 parts of silicate, 0.5-1.8 parts of modifier, 0.5-1 part of organic ester, 0.5-1 part of defoamer, 0.5-1 part of thickener, 0.5-1 part of film-forming aid, 0.5-1 part of leveling agent, 0.5-1 part of dispersant, 15-40 parts of pigment and filler, and 5-10 parts of solvent.

2. An impact-resistant and corrosion-resistant isocyanate / silicate coating, characterized in that: The silicate needs to be chemically modified by covalent bonds. As an inorganic substance, silicate has carboxyl groups and hydroxyl groups, which can be grafted onto the isocyanate organic resin by covalent bond modification.

3. An impact-resistant and corrosion-resistant isocyanate / silicate coating, characterized in that: The modifier needs to be hydrolyzed.

4. An impact-resistant and corrosion-resistant isocyanate / silicate coating, characterized in that: The hydrolysis solution is prepared by mixing the modifier, deionized water and anhydrous ethanol in a ratio of 1:3:

6.

5. An impact-resistant and corrosion-resistant isocyanate / silicate coating, characterized in that: During the hydrolysis of the modifier, the mixture was mixed by adding the solution in batches. First, deionized water and anhydrous ethanol were mixed at a stirring speed of 800 rpm. During the mixing process, the silane coupling agent was slowly added dropwise, the pH of the solution was adjusted, and stirring was continued for 4 hours.

6. An impact-resistant and corrosion-resistant isocyanate / silicate coating, characterized in that: During the modification process, the modifier was added to the silicate solution in a dropwise manner at a rate of 0.4-0.6 g / min, and the mixture was stirred at a speed of 800 rpm for 20 minutes.

7. An impact-resistant and corrosion-resistant isocyanate / silicate coating, characterized in that: The silicate can be selected from sodium silicate and potassium silicate.

8. An impact-resistant and corrosion-resistant isocyanate / silicate coating, characterized in that: The pigment or filler may be one of titanium dioxide, carbon black, iron oxide, phthalocyanine blue, organic yellow and organic red.

9. An impact-resistant and corrosion-resistant isocyanate / silicate coating, characterized in that: The addition of the additives was carried out by dropwise addition, and the dropwise addition rate was controlled at 0.4-0.8 g / min.

10. An impact-resistant and corrosion-resistant isocyanate / silicate coating, characterized in that: During the mixing process of the silicate-modified isocyanate organic resin, the stirring speed is controlled to be 700-800 rpm and the stirring time is 20-30 minutes.

11. A method for preparing an impact-resistant and corrosion-resistant isocyanate / silicate coating, characterized in that: include: Under normal temperature and pressure, the hydrolyzed modifier is added to the silicate solution in a specific ratio and mixed to obtain solution A. The component A solution and the isocyanate organic resin are uniformly mixed in a certain mass ratio, and organic ester, defoamer, dispersant, thickener and pigment filler are added to the mixed solution while drying at room temperature and pressure.

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