A kind of silicone acrylic emulsion and preparation method thereof

Abstract

The invention discloses a silicone-acrylic emulsion and a preparation method thereof. The silicone-acrylic emulsion is prepared from a first component and a second component, wherein the first component is prepared from the following raw materials in parts by weight: 20 to 30 parts of methyl methacrylate, 40 to 60 parts of butyl acrylate, 1 to 3 parts of acrylic acid, 0.8 to 1.2 parts of emulsifier and 50 to 60 parts of deionized water; the second component is prepared from the following raw materials in parts by weight: 30 to 50 parts of organosilicon monomer, 0.8 to 1.2 parts of dodecylbenzenesulfonic acid, 0.5 part of emulsifier and 30 to 40 parts of deionized water; the organosilicon monomer is a mixture of octamethyl cyclotetrasiloxane and triethoxyvinyl-siloxane. The silicone-acrylicemulsion is relatively higher in organic silicon content. In the method disclosed by the invention, when the first component and the second component are added dropwise, a polymerization reaction isperformed by a graduation polymerization method, so that the glass transition temperature and lowest film-forming temperature of the generated silicone-acrylic emulsion are lower.

Description

Technical field

[0001] The invention relates to the field of building materials, in particular to a silicone acrylic emulsion and a preparation method thereof. Background technique

[0002] Silicone-acrylic emulsion is a commonly used film-forming substance in the formulation of waterproof coatings. It is a water-based emulsion polymerized by the core-shell coating polymerization process by adding organic silicon monomers and acrylic monomers containing unsaturated bonds with appropriate additives. . It combines high temperature resistance, weather resistance, chemical resistance, hydrophobicity, low surface energy, and high color retention, flexibility, and adhesion of acrylic resin. It is a kind of high weather resistance, high water resistance, and pollution resistance. Emulsion for environmentally friendly architectural coatings.

[0003] Although silicone-acrylic emulsion has good application prospects, it is difficult to emulsify in water due to the extremely low surface en...

Examples

Embodiment 1

[0036] Prepare the raw materials according to the formula shown in Table 1. The emulsifier is a mixture of sodium lauryl sulfate and alkylphenol polyoxyethylene ether, the mass ratio of the two is 2:1; the organic silicon monomer is octamethylcyclotetrasiloxane The mixture of oxygen and vinyl triethoxy siloxane, the mass ratio of the two is 3:1;

[0037] Mix methyl methacrylate, butyl acrylate, acrylic acid, emulsifier and deionized water, and stir at room temperature for 30 minutes to form the first component after pre-emulsification; combine the silicone monomer, dodecylbenzene sulfonic acid, emulsifier and Mix deionized water, stir at room temperature for 30 minutes to pre-emulsify, then heat to about 55°C and keep at constant temperature for 5 hours to form the second component; add deionized water, emulsifier and sodium bicarbonate into the reactor to mix, stir and heat to 80°C At around -85°C, nitrogen gas is introduced into the reactor, and ammonium persulfate is added aft...

Embodiment 2

[0040] The difference between Example 2 and Example 1 lies in the ratio of raw materials.

Embodiment 3

[0042] The difference between Example 3 and Example 1 lies in the ratio of raw materials.

Technical field

[0001] The invention relates to the field of building materials, in particular to a silicone acrylic emulsion and a preparation method thereof. Background technique

[0002] Silicone-acrylic emulsion is a commonly used film-forming substance in the formulation of waterproof coatings. It is a water-based emulsion polymerized by the core-shell coating polymerization process by adding organic silicon monomers and acrylic monomers containing unsaturated bonds with appropriate additives. . It combines high temperature resistance, weather resistance, chemical resistance, hydrophobicity, low surface energy, and high color retention, flexibility, and adhesion of acrylic resin. It is a kind of high weather resistance, high water resistance, and pollution resistance. Emulsion for environmentally friendly architectural coatings.

[0003] Although silicone-acrylic emulsion has good application prospects, it is difficult to emulsify in water due to the extremely low surface en...

Examples

Embodiment 1

[0036] Prepare the raw materials according to the formula shown in Table 1. The emulsifier is a mixture of sodium lauryl sulfate and alkylphenol polyoxyethylene ether, the mass ratio of the two is 2:1; the organic silicon monomer is octamethylcyclotetrasiloxane The mixture of oxygen and vinyl triethoxy siloxane, the mass ratio of the two is 3:1;

[0037] Mix methyl methacrylate, butyl acrylate, acrylic acid, emulsifier and deionized water, and stir at room temperature for 30 minutes to form the first component after pre-emulsification; combine the silicone monomer, dodecylbenzene sulfonic acid, emulsifier and Mix deionized water, stir at room temperature for 30 minutes to pre-emulsify, then heat to about 55°C and keep at constant temperature for 5 hours to form the second component; add deionized water, emulsifier and sodium bicarbonate into the reactor to mix, stir and heat to 80°C At around -85°C, nitrogen gas is introduced into the reactor, and ammonium persulfate is added aft...

Embodiment 2

[0040] The difference between Example 2 and Example 1 lies in the ratio of raw materials.

Embodiment 3

[0042] The difference between Example 3 and Example 1 lies in the ratio of raw materials.

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