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
View PDF6 Cites 18 Cited by
  • 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 a

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Example Embodiment

[0064] Example 1

[0065] (1) Dehydrate 0.2mol of fluoropolyether polyol resin with a molecular weight of 2000g / mol at 110°C and a vacuum of 0.08MPa for 1.5h, then add 0.22mol of MDI, and stir under nitrogen protection at 60°C After reacting at a constant temperature for 2 hours, an FPU prepolymer containing -NCO end groups was obtained.

[0066] (2) Add 6% of the hydrophilic chain extender dimethylolpropionic acid (DMPA) of the prepolymer to the prepolymer prepared in step (1), and react at a constant temperature at 80°C for 3h to obtain a carboxyl group The 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 with DMPA, and pass nitrogen protection , Quickly stir for 15min under normal pressure and 400rpm speed, and get salted hydrophilic FPU prepolymer after full reaction.

[0068] (4) Discharge the salted hydrophilic FPU prepolymer in step (3) in...

Example Embodiment

[0073] Example 2

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

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

Example Embodiment

[0076] Example 3

[0077] In step (1), the molecular weight of the polyether polyol resin containing fluoroalkyl groups 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℃ to 120℃ Change the constant temperature reaction at 60°C for 2h to 80°C constant temperature reaction for 1h. In step (5), the added amount of ADH chain extender is changed from 3% equivalent to emulsified FPU volume percentage to 1%. The other steps are the same as those in Example 1. the same.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Tensile strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap