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Non-fluoro hydrophobic aqueous-based polyurethane resin dispersion

a technology of hydrophobic aqueous and resin, which is applied in the field of non-fluoro hydrophobic aqueous pu dispersion, can solve the problems of inability to maintain long-term efficacy of resin products having flour content, material already reaching its limitation of water-repellent fabric, and affecting the ecological environment of earth, so as to improve washing resistance and solvent resistance, and increase cross-linking density

Inactive Publication Date: 2015-10-01
TAMKANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution achieves long-lasting hydrophobic efficacy with improved washing durability and solvent resistance, maintaining 85% of original water-repellent properties after 50 wash cycles and reducing environmental harm, aligning with energy-saving and carbon reduction goals.

Problems solved by technology

However, these materials already reach its limitation of water-repellent fabric in the aspect of resistance.
This situation is expected to cause an impact to environment, especially the accumulation in alive organism, and further may cause the defects for considering the damage of ecological environment of earth.
Hence, the processed products of resin having flour-content cannot maintain long-term efficacy of water repellent, and this is a problem which the fabric for treating water repellent needs to be dealt with.
Regarding the cleaning in aspect of customers, it requires specific professional method to clean it and that would be another inconvenience.
1. The bad hand-feel: Using the coating of water repellent having acrylic resin fluoro or PTFE attached film on the surface of fiber causes the stiff feeling when touching the fabric.
2. The poor washing durability: After the process of water-repellent coating, the known water-repellent fabric is only covered by the water repellent on its surface, instead of polymeric inter-penetrating networks (IPN) anchoring in fabric and forming between fabric yarns. Hence, after multiple times of use, it is easy to damage the fabric due to rubbing and washing, further to decrease the water-repellent function. The fabric has the durability decrease.
3. Poor Breathability: The processes material, such as water repellent, is covered on the surface of fabric by the coverage method. Due to overdose of resin coating on, the excess amount of resin plugs the fabric and decreases the original air permeability of fabric. The fabric has the defect on breathability.
4. The cost of protecting environment is too high: In the known knowledge, no matter using the method of coating or attached film, it requires a fluoro-containing polymer that can cause pollution loading, bio-toxicity and the accumulation in alive organism to environment. The fabric has the defect that cause damage to ecology of earth.

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
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  • Non-fluoro hydrophobic aqueous-based polyurethane resin dispersion
  • Non-fluoro hydrophobic aqueous-based polyurethane resin dispersion
  • Non-fluoro hydrophobic aqueous-based polyurethane resin dispersion

Examples

Experimental program
Comparison scheme
Effect test

example 1

The Preparation of Isocyanate Terminated Polyurethane (PU) Prepolymer

[0066]Taking 13.4 g of 2,2′-bis(hydroxymethyl) propionic acid (DMPA) and 200 g of polytetramethylene ether glycol (PTMEG-2000) separately and placing them into four-necked reaction tank, and heating to 140° C. to melt DMPA and stirring it with mechanical agitation evenly. Wait for the temperature drop to 80° C., adding 0.1%(w / w) catalyst (T-12) and 66.6 g of isophorone diisocyanate (IPDI) and keep reaction temperature below 86° C. with stirring until the reaction is completed (NCO % below the calculated value). After the reaction is completed, processing NCO titration to analyze the degree of reaction, as long as it reaches NCO % is less than 3% and remains at that value for one hour. Further using FT-IR to determine the presence of the NCO peak (near 2267 cm−1) in order to make sure that if the reaction is completed.

example 2

Preparing Aliphatic Long Chain Carbon-Carbon Bond Containing PU Oligomer

[0067]Using isocyanate functional groups having selective diisocyantes (polyisocyantes, IPDI)), triol (glycerol or trimethylolpropane, TMP) and long chain fatty alcohol compounds (fatty alcohol or higher alcohol), by using an excess amount of isocyanates (IPDI), and then adding minor catalyst, dibutyltin dilaurate (DBTDL) to accelerate the reaction being completed. It results in the formation of NCO-terminated aliphatic long chain carbon-carbon bond containing PU oligomer.

example 3

The Preparation of “Single-Component Aliphatic Long Chain Carbon-Carbon Bond Containing Aqueous PU Dispersion”

[0068]Selecting polyether polyol (e.g., PPG or PTMEG), polyisocyanate (IPDI) materials, or diol compounds containing hydrophilic functional groups as internal emulsifier (for instance, dimethylol propanic acid, DMPA) and fatty alcohols (aliphatic long chain carbon-carbon bond alcohol compounds). A long chain carbon-carbon bond containing PU prepolymer having isocyanate as terminal group (with fatty alcohols involved in the reaction). Determine the amount of NCO to confirm that the reaction is completed, and adding triethylamine to neutralize and adding deionized water with a chain extender (such as diethyleneamine) to process the steps of chain extension and dispersion, and the self-emulsified aliphatic-containing aqueous PU dispersions is obtained. In this aqueous PU dispersion, adding proper quantity latent cross-linking agent (TMPTA-AZ or CX100) and maintain the pH value ...

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Abstract

The present invention provides a cross-linking non-fluoro hydrophobic aqueous polyurethane dispersion, which is produced by selecting a compound comprising alcohols, amines, acids, saturated or unsaturated (double-bonded or epoxidized) aliphatic long chain carbon-carbon groups or polydimethylsiloxane comprising alcohol groups, amines, oxosilane to be reacted with IPDI to obtain a PU prepolymer; adding a compound having tertiary amines to neutralize the carboxylic acid of PU prepolymer and adding water to disperse the PU prepolymer; and adding a ambient temperature cross-linking agent to obtain a cross-linking hydrophobic aqueous PU dispersion of the present invention. The hydrophobic aqueous-based PU resin has no fluorine which is friendly to the environment, and may further self cross-links on its applications on fabric, paper, wood, glass and metal surfaces, respectively on drying at ambient temperature which is energy saving process. Its cross-linking reaction of this hydrophobic PU system that will achieve a long-lasting water repellent surface treatment.

Description

BACKGROUND[0001]The present invention relates to aqueous polyurethane (PU) dispersion, and its production method and use, especially a non-fluoro, hydrophobic aqueous PU dispersion, and its production method and use.[0002]Nowadays, the public places importance on outdoor activities, sports and work out. Regarding the dressing while doing exercise, the requirements for a functional dress are light, convenient and comfortable. Hence, this kind of functional dressing becomes the main business of the development. Generally, an outdoor dressing for user to feel comfortable usually requires a water-repellent surface, i.e. its materials have hydrophobic properties, and a property for releasing the moisture from human body at the same time, i.e. the fabric having a breathable function (moisture permeation and sweat release). This kind of product is needed in the current market.[0003]The fabric having a function of moisture permeation and sweat release, which has been sold in market, uses th...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D175/08
CPCC09D175/08C09D175/04C08G18/4854C08G18/61C08G18/6692C08G18/755C08G18/003C08G18/0823C08G18/34C08K5/053C08K5/17C08K5/3412C08G18/12C08G18/3228C08G18/2825C08G18/281D06M15/564D06M15/568
Inventor CHEN, KAN-NANHWANG, JING-ZHONGWU, REI-XINLU, MEI-TINGCAI, WAN-CHUNCHEN, CHUNG-YINCHEN, CHIA-HSIN
Owner TAMKANG UNIVERSITY