Glue adhesive for water-based polyurethane coating

Glue adhesive for water-based polyurethane coating

The drawback of the inline method is that the prepolymer is very sticky and hard to emulsify. Waterborne polyurethane adhesive foreign link "is used in glue before adding cross-linking agent, after the film-forming process or film, heating to produce chemical reaction, to form the crosslinked film.

Compared with the internal crosslinking, the properties of the emulsion are good, the disadvantages of the water-based polyurethane adhesives are the two-component system, and no single component is convenient.

Foreign available formaldehyde and melamine - formaldehyde resin, epoxy compounds as crosslinking agent, waterborne polyurethane adhesive is in commonly 120 ~ 180 ℃ under the high temperature of crosslinking reaction. Can also be n propyl organism, carbide imide, isocyanate and metal salts compound as crosslinking agent, can react at room temperature, carboxyl group can make n propyl organism open-loop crosslinking reaction.

Water-based polyurethane adhesives are more volatile and irritant, and have certain toxicity to the respiratory system, which is detrimental to the occupational health of workers.

In order to improve the washing resistance of fabric, the crosslinking resin (also known as crosslinking agent) mixed with adsorption type of antibacterial agent directly, or when use will direct adsorption type of antibacterial agent and crosslinking resin spell with the class. This kind of antibacterial agent on the one hand, can rely on direct affinity of antibacterial agent and fiber to fiber molecular combination, on the other hand, with the aid of crosslinked resin bridging role, the antibacterial substances, crosslinking agent and fiber molecular combined with covalent bond.

In order to overcome the problem of hand-feeling caused by crosslinking resin, add some auxiliary softener to improve the feeling. Antimicrobial agents of this type are generally selected from an existing medical antimicrobial agent or disinfectant. Textile antibacterial agent manufacturers main research work is selected feel good crosslinking resin could satisfy the requirement of printing and dyeing finishing technology and medical antibacterial agent or disinfectant and suitable formula.




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


Because the development of such antimicrobials is relatively simple, new models and new products are constantly appearing, and the current domestic and foreign antibacterial finishes are mostly this type. This kind of product has direct affinity with fiber molecule, have covalent bond together, reason fastness is better than direct adsorption type is much better.

Antibacterial substances with controlled release of dissolution, after finishing of fabric can slowly release antibacterial material at a certain humidity, its rate can inhibit the growth of bacteria and fungi.

But as a result of antimicrobial substances not fully implement combined with fiber molecules with covalent bonds, the less usage, dissolution is not too big, although can meet the security requirements of antibacterial textiles dissolution thing, but without too much washing number? If the pursuit of high washing times, the heavy usage, increase with the content of crosslinking agent from feeling and wet gas absorption is poor, and dissolution is bigger also, even washing many times, there will still be quite a halo method to detect the bacteriostatic circle.

Cross-linked starch was prepared in 20 ~ 50 ℃ temperature of crosslinking agent is added to the alkaline starch suspension, reaction to the required time, filtered water washing and drying, the recovery of starch, crosslinking degree of different cross-linking agent, reaction time and other factors. The dosage of crosslinking agent is 0.005 ~ 0.1% of starch quality.

Reagent starch molecules caused by the bridging between, between the molecules form the crosslinking, thus significantly increased the average relative molecular mass, crosslinking starch molecules is between the hydroxyl and crosslinking agent of multifunctional groups.

Crosslinking agent a lot of more phyletic, used for the preparation of cross-linked starch crosslinking agent with phosphorus oxychloride, epichlorohydrin, three metaphosphate, acetic acid, vinyl sulfone, double epoxy compound, formaldehyde, acetaldehyde, acrolein, etc.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

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