Preparation method of waterproof and whiting-resistant silicon-acrylic composite emulsion for interior wall latex coatings

A latex paint and composite emulsion technology, applied in latex paint, coating, etc., can solve the problems of difficulty in the migration of organic silicon molecular chains, limited performance improvement of composite resins, and complicated operations, and achieve good mechanical stability and storage stability. Excellent water resistance to whitening and water resistance, and the effect of simple and easy preparation process

Inactive Publication Date: 2015-07-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional emulsion polymerization process is simple, but siloxane is prone to hydrolysis and polycondensation in the water phase during polymerization, which affects the copolymerization of vinyl organosiloxane and acrylate monomers, and it is difficult to prepare silicone acrylic emulsion with high silicon content
Although the core-shell emulsion polymerization method can endow the emulsion with different properties through different core-shell layers, the operation of this method is complicated, and the process control requirements are relatively strict. When silicone is the core, its surface is embedded by polyacrylate, and the composite resin The performance improvement is limited; when silicone is the shell, the stability of the emulsion is poor, and it is easy to produce two kinds of latex particles, polyacrylate and polysiloxane, and the obtained resin is difficult to take into account the advantages of both
The molecular chains of polyorganosilane and polyacrylate in the silicone-acrylic composite emulsion prepared by interpenetrating network polymerization interpenetrate and intertwine, which can effectively solve the problem of phase separation between silicone and acrylic resin, but the process is also complicated, and the structure and shape of composite particles , the degree of interpenetration of the two, the size of the phase region, etc. are difficult to control, and due to the entanglement of the molecular chains, it is difficult to migrate the silicone molecular chains during the film-forming process of the emulsion, and it is difficult to truly achieve the unity of cost and performance

Method used

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  • Preparation method of waterproof and whiting-resistant silicon-acrylic composite emulsion for interior wall latex coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The mass fraction of raw materials consists of:

[0043] Monomer 46wt%

[0044] Of which: methyl methacrylate 46wt%

[0045] Butyl acrylate 39wt%

[0046] Styrene 5wt%

[0047] Methacrylic acid 2wt%

[0048] Tetramethyldivinyldisiloxane 3wt%

[0049] Diacetone acrylamide 0.5wt%

[0050] Adipic acid dihydrazide 0.5wt%

[0051] Hydroxybutyl acrylate 4wt%

[0052] complex emulsifier

[0053] Nonylphenol polyoxyethylene ether sulfosuccinic acid monoester disodium salt 1.6wt%

[0054] Sodium Lauryl Sulfate 0.4wt%

[0055] Initiator ammonium persulfate 1.0wt%

[0056] The rest is deionized water;

[0057]The specific preparation method is as follows: 30wt% emulsifier is uniformly dissolved in 35wt% deionized water accounting for the total amount of pre-emulsified monomers, and then poured into pre-mixed tetramethyldivinyldisiloxane, diacetone acrylamide , hydroxybutyl acrylate, methacrylic acid, 60wt% methyl methacrylate and 60wt% butyl acrylate mixture, first emu...

Embodiment 2

[0059] The mass fraction of raw materials consists of:

[0060] Monomer 48wt%

[0061] Among them: methyl methacrylate 45wt%

[0062] Butyl acrylate 38wt%

[0063] Styrene 5wt%

[0064] Methacrylic acid 2wt%

[0065] Vinyl silicone oil DY-V401 4wt%

[0066] Diacetone acrylamide 1wt%

[0067] Adipic acid dihydrazide 1wt%

[0068] Hydroxyethyl Acrylate 4wt%

[0069] complex emulsifier

[0070] Nonylphenol polyoxyethylene ether sulfosuccinic acid monoester disodium salt 2.4wt%

[0071] Sodium Lauryl Sulfate 0.6wt%

[0072] Initiator ammonium persulfate 0.8wt%

[0073] The rest is deionized water;

[0074] The specific preparation method is as follows: 35wt% composite emulsifier is uniformly dissolved in deionized water accounting for 40wt% of the total amount of pre-emulsified monomers, and then poured into pre-mixed uniform vinyl silicone oil DY-V401, diacetone acrylamide, acrylic acid hydroxyl In the mixture of ethyl ester, methacrylic acid, 65wt% methyl methacrylat...

Embodiment 3

[0076] The mass fraction of raw materials consists of:

[0077] Monomer 48wt%

[0078] Of which: methyl methacrylate 46wt%

[0079] Butyl acrylate 39wt%

[0080] Styrene 5wt%

[0081] Methacrylic acid 2wt%

[0082] Tetramethyltetravinylcyclotetrasiloxane 3wt%

[0083] Diacetone acrylamide 1wt%

[0084] Succinic acid dihydrazide 1wt%

[0085] Hydroxypropyl Acrylate 3wt%

[0086] complex emulsifier

[0087] Nonylphenol polyoxyethylene ether sulfosuccinic acid monoester disodium salt 2.4wt%

[0088] Sodium Lauryl Sulfate 0.6wt%

[0089] Initiator ammonium persulfate 1.0wt%

[0090] The rest is deionized water;

[0091] Its specific preparation method is: 35wt% of the emulsifier is uniformly dissolved in deionized water accounting for 40wt% of the total amount of pre-emulsified monomers, and then poured into pre-mixed tetramethyltetravinylcyclotetrasiloxane, diacetone propylene Amide, hydroxypropyl acrylate, 70wt% methyl methacrylate and 70wt% butyl acrylate mixture, f...

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Abstract

The invention relates to a preparation method of a waterproof and whiting-resistant silicon-acrylic composite emulsion for interior wall latex coatings. The emulsion comprises the following raw materials: monomers, emulsifiers, initiators such as ammonium persulfate and deionized water. The raw materials are orderly processed through steps of pre-emulsifying the monomer, polymerizing seed emulsion, polymerizing semi-continuous emulsion and finally filtering and discharging. According to the preparation method, vinyl organic silicon, a self-crosslinking system and assistant cross-linking agents are copolymerized with acrylic esters monomers by using pre-emulsification semi-continuous seed emulsion polymerizing method to prepare the silicon-acrylic composite emulsion. Entire preparation process is stable and convenient and is beneficial to achieving mass production. The obtained composite emulsion has the advantages of monomer conversion rate of more than 96%, average emulsion particle size of less than 100 nanometers (nm), good mechanical stability and storage stability, high hardness of film, low lowest film-forming temperature and excellent whiting resistance in water and water resistance.

Description

technical field [0001] The invention relates to a preparation method of a water-based paint, in particular to a preparation method of a water-resistant and anti-whitening silicon-acrylic composite emulsion for an interior wall latex paint. Background technique [0002] With the increasingly stringent environmental protection requirements and people's increasing attention to the quality of the living environment, the content of volatile organic compounds (VOC) has become an important inspection index in the process of interior decoration. At present, traditional solvent-based interior wall paints have been gradually replaced by latex paints in water-based paints. As a film-forming substance commonly used in latex coatings, polyacrylate emulsions have also been extensively studied and applied in recent years. Polyacrylate emulsion has a wide range of raw materials and low price. It not only has excellent weather resistance, gloss retention, adhesion and chemical resistance, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/14C08F220/18C08F212/08C08F220/06C08F230/08C08F2/30C08F2/26C09D133/12C09D5/02
Inventor 马建中吴喜元鲍艳
Owner SHAANXI UNIV OF SCI & TECH
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