Polyacrylate/nano SiO2 hybrid emulsion with high coating film hardness and tolerance and preparation method for polyacrylate/nano SiO2 hybrid emulsion and application of polyacrylate/nano SiO2 hybrid emulsion

A technology of polyacrylate emulsion and polyacrylate, applied in the direction of coating, can solve the problems of poor storage stability, high production cost, poor coating film performance, etc., to improve transparency and gloss, and improve storage stability , the effect of simple preparation process

Inactive Publication Date: 2016-03-02
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common problems in the preparation of organic / inorganic nano-hybrid emulsions are: the content of inorganic components in the hybrid system is low, and it is easy to agglomerate, resulting in poor storage stability, and the compatibility between organic components and inorganic components is not good. Good results in poor coating performance, high production costs, difficulties in industrialization, etc.
There is no better way to increase the content of inorganic silicon in the hybrid system to prepare a hybrid emulsion with good stability, high hardness of the coating film and excellent chemical resistance

Method used

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  • Polyacrylate/nano SiO2 hybrid emulsion with high coating film hardness and tolerance and preparation method for polyacrylate/nano SiO2 hybrid emulsion and application of polyacrylate/nano SiO2 hybrid emulsion
  • Polyacrylate/nano SiO2 hybrid emulsion with high coating film hardness and tolerance and preparation method for polyacrylate/nano SiO2 hybrid emulsion and application of polyacrylate/nano SiO2 hybrid emulsion
  • Polyacrylate/nano SiO2 hybrid emulsion with high coating film hardness and tolerance and preparation method for polyacrylate/nano SiO2 hybrid emulsion and application of polyacrylate/nano SiO2 hybrid emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of vinyl siloxane modified polyacrylate emulsion:

[0039] formula:

[0040] Table 1a

[0041]

[0042]

[0043] Preparation method: firstly mix vinyl siloxane and all acrylate monomers uniformly according to the formula to prepare acrylate monomer mixture; add emulsifier into a 500mL four-necked flask equipped with a thermometer, condenser tube, stirring paddle and constant pressure funnel (anionic emulsifier SDS and nonionic emulsifier OP‐10, NaHCO 3 And appropriate amount of deionized water, heat up to 75-80 ° C, then add 10% initiator potassium persulfate (KPS), after 20 minutes of heat preservation, start to drop 10% acrylate monomers (MMA, EA and MAA) to prepare seed emulsion , after the system is in the blue phase and stabilizes for 30 minutes, continue to drop the remaining aqueous solution of the acrylate monomer and the initiator (first made into a 10% aqueous solution), after the addition is completed, heat up to 82-85°C for 1 hour, co...

Embodiment 2

[0057] (1) Preparation of vinyl siloxane modified polyacrylate emulsion:

[0058] formula:

[0059] Table 2a

[0060]

[0061] Preparation method: firstly mix vinyl siloxane and all acrylate monomers uniformly according to the formula to prepare acrylate monomer mixture; add emulsifier into a 500mL four-necked flask equipped with a thermometer, condenser tube, stirring paddle and constant pressure funnel , NaHCO 3 Add appropriate amount of deionized water, heat up to 75-80°C, then add 20% initiator, after 10 minutes of heat preservation, start to drop 5% acrylate monomer to prepare seed emulsion, wait until the system is in blue phase and stabilize for 10 minutes, continue to drop The remaining acrylate monomer and the aqueous solution of the initiator (prepared as a 10% aqueous solution), after the dropwise addition is completed, the temperature is raised to 82-85° C. and kept for 1 hour, and the temperature is lowered and filtered out.

[0062] Emulsion properties: ave...

Embodiment 3

[0072] (1) Preparation of vinyl siloxane modified polyacrylate emulsion:

[0073] formula:

[0074] Table 3a

[0075]

[0076]

[0077] Preparation method: firstly mix vinyl siloxane and all acrylate monomers uniformly according to the formula to prepare acrylate monomer mixture; add emulsifier into a 500mL four-neck flask equipped with a thermometer, condenser tube, stirring paddle and constant pressure funnel , NaHCO 3 and an appropriate amount of deionized water, heat up to 75-80°C, then add 30% initiator, after 30 minutes of heat preservation, start to add 15% acrylate monomer mixture dropwise to prepare seed emulsion, wait for the system to become blue phase and stabilize for 20 minutes, continue to drop Add the remaining acrylate monomer mixture and the aqueous solution of the initiator (prepared into a 10% aqueous solution first), after the dropwise addition, raise the temperature to 82-85°C and keep it warm for 1 hour, then cool down and filter out.

[0078] E...

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Abstract

The present invention discloses a polyacrylate/nano SiO2 hybrid emulsion with high coating film hardness and tolerance and a preparation method for the polyacrylate/nano SiO2 hybrid emulsion and an application of the polyacrylate/nano SiO2 hybrid emulsion. The preparation method comprises: by virtue of a semi-continuous seed emulsion polymerization process, firstly preparing a vinyl silicone modified polyacrylate emulsion; and then blending the emulsion with a silica sol, cosolvent and other auxiliaries to prepare the polyacrylate/nano SiO2 hybrid emulsion with a high silicon content. Concentration with the cosolvent can enable siloxy on organic polymer chains and silicon hydroxyl of the silica sol to perform a sol-gel reaction when a film is formed, and self-assembly on the coating film surface occurs to generate a compact glassy coating film, thereby improving the hardness, chemical resistance and thermal resistance of the coating film. The PAE/SiO2 hybrid emulsion provided by the present invention has the characteristics of good storage stability, high silicon content of the coating film, high hardness of the coating film and excellent chemical resistance.

Description

technical field [0001] The invention relates to a polyacrylate hybrid emulsion, in particular to a polyacrylate / nanometer SiO with high film hardness and tolerance 2 A hybrid emulsion and a preparation method thereof, the hybrid emulsion is used for water-based wood coatings. Background technique [0002] Polyacrylate has excellent properties such as transparency, color retention, weather resistance, and corrosion resistance. Using it as a film-forming material to prepare water-based coatings has good weather resistance, pollution resistance, acid and alkali resistance, and is widely used. Used in the coating of buildings, wood and metal. Compared with solvent-based polyacrylate coatings, water-based acrylic coatings have serious deficiencies in terms of hardness, scratch resistance, and chemical medium resistance, and they need to be modified to improve performance and expand application fields. Modification includes the use of internal cross-linking modification, which w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/18C08F220/06C08F230/08C08F222/02C08F222/06C08F220/32C08F2/26C08F2/30C09D133/12C09D133/08C09D7/12
Inventor 瞿金清王彩朱延安
Owner SOUTH CHINA UNIV OF TECH
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