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Hydrophobic oleophobic aqueous compositions and preparation method thereof

A water-based composition, hydrophobic and oleophobic technology, applied in the direction of textiles, papermaking, fiber treatment, etc., can solve the problem of reducing the amount of fluorine-containing monomers in terms of hydrophobic and oleophobic properties, insufficient hydrophobic and oleophobic properties, and inability to fully utilize fluoropolymers Excellent performance and other issues, to achieve the effect of excellent hydrophobic and oleophobic properties and stability

Active Publication Date: 2012-02-29
JIANGXI LEE & MAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tanaka et al. (JP11269238, 1999-10-05) proposed a core-shell emulsion polymerization method, with the fluorine-containing polymer as the core and the polyester as the shell. Although a stable emulsion can be obtained, since the fluorine-containing monomers are all located in the core layer , and cannot give full play to the excellent properties of fluoropolymers
Subsequently, Park et al. (Macromolecules2002, 35 (18), 6811-6818) used core-shell polymerization to obtain an emulsion with styrene as the core and fluoroacrylate as the shell, which kept the emulsion while reducing the amount of fluorine-containing monomers. Hydrophobic and oleophobic properties; but as a practical application, its hydrophobic and oleophobic properties are still not sufficient

Method used

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  • Hydrophobic oleophobic aqueous compositions and preparation method thereof
  • Hydrophobic oleophobic aqueous compositions and preparation method thereof
  • Hydrophobic oleophobic aqueous compositions and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Core layer monomer: 9 g of methyl methacrylate, 6 g of lauryl methacrylate, 0.7 g of N-methylol acrylamide, and 0.045 g of dodecyl mercaptan.

[0040] Shell monomer: C n f 2n+1 C 2 h 4 OCOC(R)=CH 2 (the average value of n is 8) 6 g, 4 g of lauryl methacrylate, 0.3 g of N-methylol acrylamide, and 0.03 g of dodecyl mercaptan.

[0041] Emulsifier: nonylphenol polyoxyethylene ether (OP-10) 0.4g, sodium dodecylsulfonate 0.1g, sodium bicarbonate 0.05g, dissolved in 70g deionized water.

[0042] Initiator: 0.15 g of potassium persulfate.

[0043] (1) emulsify the core layer monomer and 60% emulsifier aqueous solution with a high-pressure homogenizer for 30min, then add it to the reactor for conversion, nitrogen gas 10min, be warming up to 75°C, add 0.078g of the aqueous solution of the initiator to carry out Seed polymerization reaction 1h, the monomer conversion rate is controlled at 90%;

[0044] (2) The shell monomer and 40% emulsifier aqueous solution are emulsified...

Embodiment 2

[0046] Core layer monomer: 7 g of methyl methacrylate, 8 g of lauryl methacrylate, 0.3 g of N-methylol acrylamide, and 0.03 g of dodecyl mercaptan.

[0047] Shell monomer: C n f 2n+1 C 2 h 4 OCOC(R)=CH 2 (The average value of n is 8) 7g, 3g of lauryl methacrylate, 0.2g of N-methylolacrylamide.

[0048] Emulsifier: 0.4 g of nonylphenol polyoxyethylene ether (OP-10), 0.1 g of sodium dodecylsulfonate, and 0.05 g of sodium bicarbonate, dissolved in 70 g of deionized water.

[0049] Initiator: 0.15 g of potassium persulfate.

[0050] (1) Emulsify the core layer monomer and 50% emulsifier aqueous solution with a high-pressure homogenizer for 30min, then add it to the reactor for conversion, nitrogen gas for 10min, be warming up to 75°C, add 0.09g of the initiator's aqueous solution to carry out Seed polymerization reaction 1h, the monomer conversion rate is controlled at 80%;

[0051] (2) The shell monomer and 50% emulsifier aqueous solution are emulsified with a high-pressur...

Embodiment 3

[0053] Core layer monomer: 7 g of methyl methacrylate, 8 g of lauryl methacrylate, 0.3 g of N-methylol acrylamide, and 0.03 g of dodecyl mercaptan.

[0054] Shell monomer: C n f 2n+1 C 2 h 4 OCOC(R)=CH 2 (the average value of n is 8) 8.2 g, 2 g of lauryl methacrylate, and 0.2 g of N-methylol acrylamide.

[0055] Emulsifier: nonylphenol polyoxyethylene ether (OP-10) 0.4g, sodium dodecylsulfonate 0.1g, sodium bicarbonate 0.05g, dissolved in 70g deionized water.

[0056] Initiator: 0.15 g of potassium persulfate.

[0057] (1) emulsify the core layer monomer and 58% emulsifier aqueous solution with a high-pressure homogenizer for 30min, then add it to the reactor for conversion, nitrogen flow for 10min, be warming up to 75°C, add 0.09g of the aqueous solution of the initiator to carry out Seed polymerization reaction 1h, the monomer conversion rate is controlled at 70%;

[0058] (2) The shell monomer and 42% emulsifier aqueous solution are emulsified with a high-pressure ho...

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Abstract

The invention provides a hydrophobic and oleophobic water-based composition which comprises the following components: A, a fluorine-free emulsifying agent, water and a fluorine-containing emulsifying agent, wherein, the fluorine-containing emulsifying agent is an optional component; A is a copolymer of fluorine-containing olefin monomers and fluorine-free olefin monomers, which has core-shell structure. The preparation method of the composition comprises the following steps: (1) monomers in a core layer and the emulsifying agents are emulsified for 30min and added into a reactor for transformation; nitrogen is pumped for 10 min and the temperature is raised to 55 DEG C to 75 DEG C; an aqueous solution of an initiator is added to carry out seeding polymerization for 1 hour; and (2) the monomers in the core layer and the emulsifying agents are emulsified for 30min and slowly dropped into the reactor for transformation, and the aqueous solution of the initiator is dropped simultaneously;the dropping is finished within 2 hours to 3 hours and the temperature is kept for 5 hours to obtain an acidic emulsion with the fixed content of 20 percent to 40 percent. The composition has excellent storage stability and dilution stability. After being processed by the composition, the processed object can have excellent hydrophobic and oleophobic performances and particularly be used for processing textile fibers.

Description

technical field [0001] The invention relates to a hydrophobic and oil-repellent aqueous composition and a preparation method thereof, which belong to the field of chemistry and chemical engineering. Background technique [0002] Fluorine-containing water-based composition is a kind of hydrophobic and oleophobic finishing agent with excellent comprehensive performance. After finishing, it can endow the substrate with excellent hydrophobic and oleophobic properties. It has been widely used in the field of fiber fabrics. However, in conventional emulsion polymerization, it is often necessary to add a large amount of fluorine-containing monomers to obtain an emulsion with excellent hydrophobic and oleophobic properties, usually accounting for more than 50% of the total monomer weight, which makes the cost of the final emulsion higher and is not conducive to environmental protection. On the other hand, the high usage of fluorine-containing monomer also makes it difficult to emuls...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/18C08F220/24C08F2/24D06M15/277
Inventor 杨德彬莫俊英鄢明陈新滋
Owner JIANGXI LEE & MAN CHEM