RND thickener in the activity of printing disperse dyes - dyes printing thickener - silk screen printing industry, especially web

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In recent years, domestic and foreign authorities on the reactive and disperse dyes Printing Thickening agent used in a lot of research carried out, and have launched a number of products, application performance has indeed made considerable progress. However, the traditional natural paste?? Alginate compared, there was this or that problem. Recently, the British launched a joint ALCOPRINTRND synthetic colloid thickener, in these two dyes Printing Use it to make new progress, so that people on the synthesis of natural paste thickener in the printing process to replace the actual application of a new understanding. I would RND in practice the situation during a brief description.





1, sodium alginate structure, properties and applications
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Alginate chemical composition of -D-mannuronic acid homopolymer long chain. Experimental formula (c6H8O6) n, the molecular weight of about 15,000.
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The alginate and then made use of soda ash in sodium alginate, according to different raw materials, generally pale yellow brown bag or brown bag, it does not dissolve in organic Solvent , Due to the molecular structure with-COONa group, so highly hydrophilic, soluble in water to become translucent, uniform viscous colloidal solution.





Case of sodium alginate solution of metal salts and metal salts generates freezing precipitation, and produce all kinds of Yen package, so pay attention to the use of preservatives.





Case of organic solvents, sodium alginate was insoluble state, but after heating, the majority can be miscible.





Case of sodium alginate solution, strong acid, strong base to concentrate precipitation, pH range of 5.8 to 11 is more stable. Prolonged exposure to air





sodium alginate solution, will lead to decrease of viscosity. Summer in the south, due to high temperature, a phenomenon more obvious need to join a certain preservatives.





As the sodium alginate solution chemistry, physical properties, so that the factory activity in the application of disperse dyes printing process, we get a lot of convenience, but also revealed some deficiencies. There are;





1. System paste longer, generally require the original paste the next day do the next day before use.





2. In the same pattern in both large fine line there, the package deployment is not easy to master slurry.





3. Summer paste perishable, and longer storage time modulation good paste viscosity decreased significantly.


4. When the package be thickened slurry is too thin, the operation is troublesome.


5. Solid sodium alginate was about 6 ~ 8%, on the handle demanding varieties, the lack becomes more.





Second, synthetic thickener PTF, RTA's performance and application


Alginate paste for these deficiencies, domestic and foreign manufacturers have developed the platform as an alternative or partial alternative thickener sodium alginate, and have made some progress. For reactive and disperse dyes such as ALCOPRINTPTF printing. Production shows that, PTF for reactive dye printing, due to the carboxylic acid group PTF and paste in the alkali react, resulting in lower pH values, will reduce its reactivity; followed with package slurry process, the thickening agent on alkali ammonium ions will be replaced by the sodium ion, resulting in the release of ammonia, the formation of bubbles, affecting printing quality; another ammonium ion have been replaced, PTF became free of strong acids, cleaning more difficult for these situation a few years ago the British company has launched the joint gel a new thickener ALCOPRINTRTA. Instead of polypropylene with ammonium polyacrylate, basically solve the above problem, however, are talking about a few joined the RTA is very sensitive to the electrolyte. During use. When the dye added, the paste viscosity will be significantly reduced, which is difficult to promote the use of RTA.





3, synthetic thickener in printing the application ALCOPRINTRND


1. Reactive Dyes Different dye concentration on the viscosity of 6% ALCOPRINTRND. See the figure below:





Different dye concentration on the viscosity of RND


Synthetic thickener is a British joint gel RND latest varieties developed, RND's name is based on the activity of English, Disperse Dyes prefix, is suitable for use in printing activities and disperse. Synthetic thickener RND appearance light yellow, is polyacrylic acid compounds. Is anionic, has a good stability of the electrolyte. Stored longer. Colorants that have been tuned to place two weeks under normal circumstances still stable (Note: Laboratory tests) in water dispersion performance, the use of a glass rod in the beaker can be quickly stir into the paste. After the Yap Cheng Ze white crystalline paste.





It can be seen, in order to make the package RND thickener slurry, better stability. Although a small number of lower viscosity, but in terms of production is completely unacceptable, according to the same circle workshop Printing machine Zoom to the situation in 3000 ~ 4000cP viscosity between the general pattern can be printed is completely satisfied.





Printing factory workshop mixing all-phase process. Also about to urea, resist salt S, baking soda, dyes, water and stir together RND 1O ~ 15min to meet the requirements made of paste, which the dosage of RND 4.5 to 5% can meet production requirements.





, Of course, RND modulation paste can as sodium alginate as the traditional production process, first make a good backup of the original paste, use and then take the original paste pulp, but I think that. This approach seems more a process, and increase the manpower and floor space, but also artificially increase the system lay time





2. Disperse Dyes RND applied to disperse, the use of more simple, this simulation in chemical fiber fabric applications are proven. The water by adding about 45% of the RND stir for 15min the preparation of a good sound of the original paste, then add the required dye mixing about 5min, filtered after the completion of paste made of the electrolyte concentration due to disperse low viscosity change is not so great. After fixing and cleaning process can follow the same way as before. Worth mentioning is the use of RND thickener for disperse printing, the color yield can be increased by 15 ~ 30%.





IV Summary In summary, RND, compared with sodium alginate with:


1. Indian pulp deployment easy and fast;


2. Viscosity control is simple, readily available for post-thickening;


3. Printing blocks and lines chiseled face, no infiltration phenomenon;


4. Improve the color yield. Than the sodium alginate is 10 ~ 30%;


5. Longer shelf life, free from microbial erosion, especially in the southern summer, more convenient to use;





6. Feel good, better than the sodium alginate





RND and the economic benefits of an integrated assessment of sodium alginate shows that although the current price of RND in the country is still higher than the sodium alginate is about 20 ~ 30%, but the simplicity of operation and the dye color yield increase printing quality