Polyurethane-acrylic ester composite emulsion and preparation method thereof

An acrylate and composite emulsion technology, applied in the direction of coating, can solve the problems of low chemical corrosion resistance, chemical resistance, solvent and water resistance on the surface of the paint film, and achieve improved application performance and wide application range. Effect

Inactive Publication Date: 2008-04-23
HONG KONG PRODUCTIVITY COUNCIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the quality of the above-mentioned emulsion has been improved somewhat, the chemical corrosion resistance of the paint film surface of the previous polyurethane-acrylate composite emulsion is not high, especially the ability to resist chemicals, solvents and water cannot meet people's needs

Method used

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  • Polyurethane-acrylic ester composite emulsion and preparation method thereof
  • Polyurethane-acrylic ester composite emulsion and preparation method thereof
  • Polyurethane-acrylic ester composite emulsion and preparation method thereof

Examples

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preparation example Construction

[0025] In the preparation step of the present invention, if necessary in the process of preparing the water-soluble polyurethane seed emulsion, acetone or ketone vacuum distillation is used to obtain the final water-soluble polyurethane seed emulsion.

[0026] Polyols or diols are used in the reaction, and the amount is in excess of the ideal ratio of organic diisocyanate to form a polyurethane prepolymer with isocyanate end groups. The suitable dosage ratio is 1:1.1 to 1:6, preferably 1:1.5 to 1:4, and the best ratio is 1:1.5 to 1:3. Polyol or diol and diisocyanate should provide suitable Anionic dispersion into prepolymers. Before the aqueous emulsion is formed after adding the monomer and forming the prepolymer, there is at least one relatively unreactive side chain carboxyl ion group in the solution, which is used to neutralize the ion salt later. The ionic salt contains active hydrogen bonds and a tertiary amine group.

[0027] A mixture of carboxyl-containing water-dis...

Embodiment 1

20.0

[0045] in the first reaction vessel

[0046] The reaction vessel was dried under nitrogen for 1 hour. Add polycaprolactone diol (PCL) (molecular weight: 2000, HMDI (molecular weight: 262.35)) in the reaction vessel, add after adding dibutyltin dilaurate (DBTL, molecular weight: 631.56), organic tin acts as a catalyst to catalyze the reaction of isocyanate-hydroxyl. The reaction mixture was stirred continuously for 30 minutes at 94°C. The percentage of NCO groups measured by adding NMP (molecular weight 99.13) by titration was 11.6%. When the NCO group content was determined, NMP (molecular weight 99.13) was added, and then DMPA (molecular weight 99.13) was added. 134.13), the reaction mixture was maintained at 94° C. for 2.5 hours. The reaction mixture was cooled to 25° C. and BA (7) was added, followed by hexanediol diacrylate (9), followed by styrene (8). When the prepolymerized monomers were cooled to 25°C, triethylamine (TEA) was added with stirring.

...

Embodiment 2

60.0

[0052] in the first reaction vessel

[0053] The reaction vessel was dried under nitrogen for 15 minutes. Add polycaprolactone diol (PCL) (1) to the reaction vessel, and add HMDI after adding an organotin catalyst (dibutyltin dilaurate, 3). The organotin acts as a catalyst to catalyze the reaction of isocyanate-hydroxyl. The reaction mixture was continuously stirred at 94°C for 30 minutes. Add NMP (4). DMPA (5) was added immediately after NMP (6), and the reaction mixture was maintained at 94°C for 2.5 hours. When the prepolymerized monomers were cooled to 25°C, triethylamine TEA (10) was added with stirring.

[0054] in the second reaction vessel

[0055] Water was added under the condition of bubbling nitrogen and maintaining 25°C. (Obtained in step 1?) The reaction mixture was cooled to 25°C and BA (7) was added followed by hexanediol diacrylate (9) followed by styrene (8). AIBN (14) was slowly added to NMP (13) in a down funnel and mixed for 5 minut...

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Abstract

The present invention provides one kind of polyurethane-acrylate composite emulsion and its preparation process. The preparation process includes preparing water soluble polyurethane seed emulsion, and adding methacrylate and cross-linking agent to the seed emulsion to prepare interpenetrating polymer network polyurethane-acrylate composite emulsion. The polyurethane-acrylate composite emulsion contains solid material in 20-60 wt%, and has particle diameter of 10-100 nm. The preparation process is simple, and the prepared polyurethane-acrylate composite emulsion has high quality, especially excellent water resistance, heat resistance, chemical resistance and wear resistance, and wide application range.

Description

technical field [0001] The invention belongs to the field of paint preparation, and more specifically relates to a polyurethane-acrylate composite emulsion and a preparation method thereof. technical background [0002] In recent years, the improvement and development of high-performance polyurethane-acrylate emulsions has become a hot topic in the coatings industry. More than 95% of all exterior finishes on wood are clearcoated. The use and subsequent volatilization of volatile organic compounds (VOCs) has become increasingly an issue over the past 20 years from an air pollution, health and safety perspective. VOCs are thought to contribute to problems such as the ozone hole, smog formation and global warming. Some volatile organic compounds can even cause harm to human health, such as carcinogenesis or organ-nervous system syndromes, such as memory impairment. Therefore, there is a need for a well-dissolved or water-soluble paint as an alternative. [0003] In order to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C09D151/08
Inventor 杨利坚陈敏强林子聪许晓峰
Owner HONG KONG PRODUCTIVITY COUNCIL
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