pvp stationery industry applications

With the rapid development of modern science and technology, the continuous improvement of people’s living standards and the rapid development of computer technology, the requirements for all kinds of office paper, printer ribbon, ink, ink and other office supplies are also getting higher and higher. The paper should be white and flat, the ink, ink, etc., requires strong adhesion and non-penetration, thin and not wrinkly, uniform texture and smooth surface, in short, it is necessary to have satisfactory hardness, coating, peeling strength and finish. The ink requires fluent writing, clear and uniform lines, should not precipitate, should not fall off, should not fade, do not block the pen. The requirements for printing ink and coating with magnetic powder ink are higher, because sometimes it is necessary to print plastic products and maintain long-term color proofing, such as ID card production, film copying and so on. In all these office supplies, PVP with different molecular weights showed superior performance.

Application of PVP in ink and ink:

PVP has good bonding properties, can be used as a binder, used in ink, ink can make writing and printing handwriting firmly attached to the paper and should not fall off and fade. In addition, PVP has a good dispersion and stability effect on inorganic pigments and organic pigments dispersions, and can be used for ink and ink to obtain a uniform dispersion system, which is not suitable for precipitation, does not block pens and various nozzles, and the depth of writing is uniform. Moreover, PVP is non-volatile, and its role and function are long-lasting, especially if the printing or printing equipment stops running for a long time, it will not block the nozzle, and it has smooth and repeated spray writing performance. The PVP used for inks and inks is generally PVP K-12 to PVP K-30 products with lower molecular weight.

Ballpoint pen ink, adding PVP K-30 to the ink plays a role in protecting colloids, thickening and viscosity, making the writing fluent, no overflow, no fading, but also reduce the wear of the ball and extend its service life.
Application of PVP in paper and other office supplies:

In the paper industry, PVP is used to improve the strength of paper, solubilizing dyes and disperse pigments, and is an important auxiliary in the deinking of waste paper, rag decomposition, beating and coloring. When used as a coating, it can improve the gloss, printability and grease resistance of the paper, especially when the surface of the printing paper is coated with a transparent coating containing PVP, which will make the printing ink dry quickly on the paper, the transparent layer has good ink absorption, insoluble in water, has good coagulability, and high-speed imaging because of transparency, especially suitable for multi-color ink printing.

The transparent paper used for drawing is required to have considerable transparency. Since the drawing is often made with pencil, the transparent paper is required to have good adhesion stability to lead powder. The matrix of this paper is transparent cellulose film, which forms transparent crosslinked cellulose sulfate resin with PVP as the main component on the cellulose film. The content of PVP in it is 1% to 10%, forming a transparent skin film of 2-10 microns, which is coated on the matrix cellulose film. On the one hand, the role of PVP in this skin film is to make the skin film and the matrix cellulose film firmly stick together, and at the same time, it also has good adhesion stability for the pigment used in drawing. On the other hand, PVP forms a film with excellent transparent performance, which can make small pigment particles transparent through the skin film and extend the storage time of the drawing, even if there is wear and tear will not affect the integrity of the painted pattern.

Usually used in the use of glue will encounter a lot of inconvenience, only solid paste is solid at room temperature, can be directly wiped and used to overcome the inconvenience of liquid glue or viscous paste, solid paste is usually composed of three different functional substances, namely excipients, solvents and bonding agent resin, the most common bonding agent when polyethylene pyrrolidone (PVP), Using different PVP with molecular weight between 40,000-90 000(K30) and 10 million-13 000 000(K90), adjusting the ratio between excipient, PVP and solvent, rod solid pastes with different hardness can be made. Other water-soluble or water-dispersed polymers such as polyvinyl alcohol, polyacrylamide, polyacrylamide copolymers, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, degradable water-soluble starch, ethoxylated starch, polyvinyl acetate, polyethylenether, polyvinyl chloride, etc. can be used as paste bonding agents. These polymers are not as good as PVP as the adhesive components of pastes (especially solid pastes). As the production cost of PVP decreases, more and more solid glue stick factories use PVP.