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

A polysiloxane, one-component technology, applied in coatings and other directions, can solve the problems of complicated construction of baking polysiloxane coatings, increase in coating viscosity, etc., and achieve improved storage stability and freeze-thaw stability, Improve dispersibility and compatibility, reduce effects

Pending Publication Date: 2022-07-05
SHANGHAI EXCILON NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the related technologies mentioned above, in winter when the temperature is low, the construction temperature is generally lower than 5°C, resulting in an increase in the viscosity of the coating. In order to meet the construction requirements of the baking polysiloxane coating, the coating needs to be preheated. Therefore, there is a problem of complex construction of baking polysiloxane coatings

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

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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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D133/00C09D1/00
CPCC09D183/04C09D1/00C08K2201/011C08L33/00C08K3/36
Inventor 赵杰李力锋孙鹏盛雷张亚莉潘东强陈德义
Owner SHANGHAI EXCILON NEW MATERIALS
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