Water-based single-component baking type polysiloxane coating and preparation method thereof

Abstract

The invention relates to the technical field of coatings, in particular to a water-based single-component baking type polysiloxane coating and a preparation method thereof. The water-based single-component baking type polysiloxane coating consists of 5 to 13 percent of hydroxy acrylic resin, 25 to 50 percent of polysiloxane prepolymer, 1 to 3 percent of filler, 5 to 10 percent of deionized water, 1 to 6 percent of solvent, 13 to 31 percent of functional additive and 0 to 10 percent of cross-linking agent. The polysiloxane prepolymer is prepared from the following components in percentage by weight: 20 to 60 percent of nano silicon dioxide sol, 20 to 60 percent of alkoxy silane and 10 to 30 percent of silane end-capping reagent. According to the water-based single-component baking type polysiloxane coating disclosed by the invention, the hydroxyl acrylic resin and the polysiloxane prepolymer are compounded, so that the freeze-thaw stability and the storage stability of the coating can be improved, and the construction convenience of the baking type polysiloxane coating can be improved.

Description

technical field

[0001] The present application relates to the technical field of coatings, and more particularly, to a water-based one-component baking polysiloxane coating and a preparation method thereof. Background technique

[0002] Metal sheet curtain wall is a decorative structure of building exterior wall composed of metal sheet panels and supporting structure system. In the metal sheet curtain wall, the commonly used metal sheets are aluminum veneer, aluminum-plastic composite panel and aluminum honeycomb panel. In order to improve the decorative and durable properties of the metal sheet curtain wall, various coatings, such as solvent-based fluorocarbon coatings, powder coatings and baking polysiloxane coatings, are applied to the metal sheets. Among them, since the baking type polysiloxane coating is a coating with water as the solvent or dispersing medium, its VOC content is low and the environmental protection performance is high, so the baking type polysiloxane ...

Examples

preparation example 1

[0058] A polysiloxane prepolymer, each component and its weight are shown in Table 1, and prepared by the following preparation steps:

[0059] The nano-silica sol was added dropwise to the alkoxysilane at 50 °C, and after stirring and mixing for 2 hours at 600 r / min, the silane end-capping agent was added, and the polysilane was stirred and mixed at 200 r / min for 0.3 hours to obtain a polysilane pre-polymer. aggregates.

[0060] Nano silica sol, the average particle size is 10nm, the pH value is 8-11, and the silica content is 30%.

[0061] After testing, the molecular weight of the polysiloxane prepolymer was 150,000.

preparation example 2

[0063] A polysiloxane prepolymer, each component and its weight are shown in Table 1, and prepared by the following preparation steps:

[0064] The silane end-capping agent was added to the alkoxysilane, and after stirring and mixing for 0.3 h at 50° C. and 200 r / min, the nano-silica sol was added dropwise, and the polysilane prepolymer was obtained by stirring and mixing for 2 h.

[0065] After testing, the molecular weight of the polysiloxane prepolymer was 100,000.

preparation example 3-5

[0067] A polysiloxane prepolymer differs from Preparation Example 2 in that the components and their weights are shown in Table 1.

[0068] Components and their weights (kg) in Table 1 Preparation Examples 1-5

[0069]

[0070]

technical field

[0001] The present application relates to the technical field of coatings, and more particularly, to a water-based one-component baking polysiloxane coating and a preparation method thereof. Background technique

[0002] Metal sheet curtain wall is a decorative structure of building exterior wall composed of metal sheet panels and supporting structure system. In the metal sheet curtain wall, the commonly used metal sheets are aluminum veneer, aluminum-plastic composite panel and aluminum honeycomb panel. In order to improve the decorative and durable properties of the metal sheet curtain wall, various coatings, such as solvent-based fluorocarbon coatings, powder coatings and baking polysiloxane coatings, are applied to the metal sheets. Among them, since the baking type polysiloxane coating is a coating with water as the solvent or dispersing medium, its VOC content is low and the environmental protection performance is high, so the baking type polysiloxane ...

Examples

preparation example 1

[0058] A polysiloxane prepolymer, each component and its weight are shown in Table 1, and prepared by the following preparation steps:

[0059] The nano-silica sol was added dropwise to the alkoxysilane at 50 °C, and after stirring and mixing for 2 hours at 600 r / min, the silane end-capping agent was added, and the polysilane was stirred and mixed at 200 r / min for 0.3 hours to obtain a polysilane pre-polymer. aggregates.

[0060] Nano silica sol, the average particle size is 10nm, the pH value is 8-11, and the silica content is 30%.

[0061] After testing, the molecular weight of the polysiloxane prepolymer was 150,000.

preparation example 2

[0063] A polysiloxane prepolymer, each component and its weight are shown in Table 1, and prepared by the following preparation steps:

[0064] The silane end-capping agent was added to the alkoxysilane, and after stirring and mixing for 0.3 h at 50° C. and 200 r / min, the nano-silica sol was added dropwise, and the polysilane prepolymer was obtained by stirring and mixing for 2 h.

[0065] After testing, the molecular weight of the polysiloxane prepolymer was 100,000.

preparation example 3-5

[0067] A polysiloxane prepolymer differs from Preparation Example 2 in that the components and their weights are shown in Table 1.

[0068] Components and their weights (kg) in Table 1 Preparation Examples 1-5

[0069]

[0070]

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