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Room-temperature self-crosslinked aqueous polyurethane-polyacrylate containing fluoroalkyl groups in lateral chains and preparation method thereof

A water-based polyurethane and polyacrylate technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of unstable coating performance, unfavorable large-area construction, etc., to facilitate construction, shorten construction period, and widen the scope of application Effect

Inactive Publication Date: 2010-08-04
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal circumstances, water-based fluorine-containing polyurethane-polyacrylate can be cured at room temperature to form a film (~7 days). Environmental factors such as climate and air humidity greatly affect the quality of the coating film, making the film performance unstable
This is obviously not conducive to its large-scale construction

Method used

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  • Room-temperature self-crosslinked aqueous polyurethane-polyacrylate containing fluoroalkyl groups in lateral chains and preparation method thereof
  • Room-temperature self-crosslinked aqueous polyurethane-polyacrylate containing fluoroalkyl groups in lateral chains and preparation method thereof
  • Room-temperature self-crosslinked aqueous polyurethane-polyacrylate containing fluoroalkyl groups in lateral chains and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (1) Dehydrate 0.2mol of fluorine-containing polyether polyol resin with a molecular weight of 2000g / mol at 110°C for 1.5h under a vacuum of 0.08MPa, then add 0.22mol of MDI, stir under nitrogen protection, and place at 60°C React at constant temperature for 2 hours to obtain the FPU prepolymer containing -NCO end group.

[0066] (2) Add 6% hydrophilic chain extender dimethylolpropionic acid (DMPA) to the prepolymer of the prepared step (1), and react at a constant temperature of 80°C for 3h to obtain carboxyl group-containing Hydrophilic FPU prepolymer.

[0067] (3) Cool the carboxyl-containing hydrophilic FPU prepolymer obtained in step (2) to 40°C, add triethylamine (TEA) to the reactor in an equimolar ratio to DMPA, and pass it into the reactor for nitrogen protection , stirred rapidly at normal pressure and 400rpm for 15 minutes, and obtained a salt-forming hydrophilic FPU prepolymer after fully reacting.

[0068] (4) Discharge the hydrophilic FPU prepolymer forme...

Embodiment 2

[0074] In step (1), the molecular weight of the polyether polyol resin containing fluoroalkyl is changed from 2000g / mol to 1000g / mol, the dehydration treatment time is changed from 1.5h to 2h, and the MDI of 0.22mol is changed to 0.30mol HMDI, other steps are all identical with embodiment 1.

[0075] The solid content of the aqueous polyurethane emulsion containing fluoroalkyl groups in the side chain is 31%, the contact angle of the film-former to water is 107°, the tensile strength is 17.3MPa, and the elongation at break is 100%.

Embodiment 3

[0077] In step (1), the molecular weight of the polyether polyol resin containing fluoroalkyl is changed from 2000g / mol to 10000g / mol, the dehydration treatment time is changed from 1.5h to 1h, and the treatment temperature is changed from 110°C to 120°C , change the constant temperature reaction 2h at 60°C to 80°C constant temperature reaction 1h, in step (5), the ADH chain extender addition is changed from 3% to 1% by volume equivalent to the emulsified FPU, and other steps are all the same as in Example 1 same.

[0078] The solid content of the aqueous polyurethane emulsion containing fluoroalkyl groups in the side chain is 26%, the contact angle of the film-former to water is 79°, the tensile strength is 11.5MPa, and the elongation at break is 300%.

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Abstract

The invention discloses a room-temperature self-crosslinked aqueous polyurethane-polyacrylate containing fluoroalkyl groups in lateral chains and a preparation method thereof. The preparation method comprises following steps: vacuum-dehydrating polyether glycol containing fluorine, and reacting with polyisocyanate to obtain FPU prepolymer containing -NCO end groups; chain-extending with dimethylolpropionic acid to obtain FPU prepolymer containing carboxyl groups; neutralizing with triethylamine to obtain hydrophilic FPU prepolymer, adding water, stirring, and dispersing at high speed to obtain an emulsion; adding a water solution containing a chain extender ADH to obtain chain-extended FPU; orderly adding diacetone acrylamide and vinyl monomer, and initiating by stirring to obtain the PUA copolymerized emulsion; and finally, uniformly mixing the chain-extended FPU with the PUA copolymerized emulsion, coating the mixture on a teflon plate, and drying and crosslinking at room temperature to form the film. The invention can be widely used for surface protection for plastics, rubber, leather, fabrics, ceramics, glass, high-rise building external walls, solar batteries and other materials and devices.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a room-temperature self-crosslinking type water-based polyurethane-polyacrylate (SC-FPUA) containing a fluoroalkyl group in a side chain and a preparation method thereof. Background technique [0002] Compared with solvent-based polyurethane resins, general water-based polyurethane resins have disadvantages such as long film-forming time, low gloss, water resistance, poor performance of solvents and chemical corrosion products, and low hardness. In order to overcome its application defects, it needs to be modified. The main way is to realize its hydrophilic modification by forming a stable cross-linked structure and polymerizing with acrylate resin. Water-based polyurethane-polyacrylate (PUA) resin contains both urethane and acrylate in its molecular structure, and its cured film-forming material has both high scratch resistance, abrasion resistance, flexibi...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08L33/12C08L33/10C08J5/18C08J3/24C08G18/66C08G18/50C08F220/14C08F220/58C08F220/18C09D175/08
Inventor 张英强贾润萍黄茂松徐家跃
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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