Crosslinking agent for sealing type polyurethane coating

Crosslinking agent for sealing type polyurethane coating

With toluene diisocyanate (w) and poly (propylene glycol - 400 (PPo - 4 oo) as raw material, acetone as the solvent, sodium bisulfite as sealing agent, adopt the method of external emulsification, synthesized a kind of sealing type polyurethane crosslinking agent.

The performed is studied and the influence of various factors in the process of sealing side, the results show that when n (NCO)/n (OH) is 2.4, the performed temperature (65 + 1) ℃, the reaction time of 90 min, the mass fraction of 25% sodium bisulfite, promoter of sodium sulfite and the sodium bisulfite mole fraction ratio 0.2, sealing and temperature 0 ~ 5 ℃, sealing side time is 4 omin, emulsifier AEO 9 and the ratio of the OEP - 982 for 3:2, mass fraction 4% of the sealing and product quality, high shear emulsifying 15 min, can form a stable emulsion.

The synthetic type of water-based water-based polyurethane is used for the dyeing of cotton fabric reactive dyes, which can obviously improve the color fastness of the fabric.

Polyurethane sorting can improve the performance of natural fiber fabric and synthetic fabrics, such as water repellent, anti-wrinkle, and anti-pilling. In the research and development of polyurethane, water-based polyurethane is an important development trend for the replacement of polyurethane because of its non-toxic, pollution-free and safe environment.

Enclosed is closed isocyanate waterborne polyurethane base way of preparation of waterborne polyurethane, closed isocyanate with storage stability at room temperature, and heat release after swim divorced cyanate ester base, can be fully react with fabric, paint and dye, also give the fabric performance.

Closed isocyanate is a compound produced by a group of isocyanate groups (NCO) that are not allowed to take off the seal at lower temperatures. The compound does not occur polymerization at room temperature, but at a certain temperature and other conditions, enclosed the isocyanate group in polyurethane can unlock, easily and have a OH, NH, SH and COOH groups such as polymer reaction, generate 3 d structure.




Chinese name: Diethyl toluene diamine(DETDA)

Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.

Density 1.022

Viscosity (20 ℃) ??mPa·ss290±10

Pour Point ℃-9

Boiling point of310°C

Flash Point°C161.1°C


If it is used for fiber surface treatment, after reaching deblocking temperature on the fiber surface got behind in film, the film can give fiber excellent properties, such as water repellency, abrasion resistance and flexibility.

Reactive dyes are widely used in the dyeing and printing of cellulose fibers. But under the condition of reactive dyes in alkaline hydrolysis easily and lose reactivity of fiber, and fiber molecular reaction of ester easy hydrolysis keys such as determines its defects still exist in some performance, such as the wet rubbing fastness of dark color product.

This experiment adopts the 2, 4. Xylene diisocyanate (TDI), polypropylene glycol (PPG - 400) 400, sodium bisulfite, emulsifier AEO 9 and OEP - 982, by the performed, sealing side, and three phase emulsification enclosed waterborne polyurethane was synthesized by crosslinking agent, as a reactive dye wet rubbing fastness to improve agent for the dyeing of cotton fabric, fabric color fastness has improved significantly.

Experiment materials: 2, 4 a xylene diisocyanate (TDI) (industrial), polypropylene glycol (PPG) 400 400 (industrial), acetone, sodium bisulfite and sodium sulfite (pure chemicals), toluene, n-butyl amine, bromocresol green (analysis), emulsifier AEO 9, emulsifier OEP - 982 (industrial)

Instruments: the electronic constant temperature water-bath water HHS stainless steel. 2 s, electronic temperature electric heating set of MH - 500, electric blast constant temperature drying box 1, 101 a, a circulating water type multipurpose vacuum pump SHB - IIIA, precision power electric blender JJ a 1, electronic analytical balance FA2104N, FLUKO FA25 scattered high shear emulsifying machine

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Diethyl toluene diamine(DETDA)  http://www.yaruichem.com