A low friction coefficient anti-blocking smooth coating and preparation method thereof

Abstract

The invention relates to a low-friction-coefficient antiblocking smooth coating and a preparation method thereof. The low-friction-coefficient antiblocking smooth coating contains the following components in parts by weight: 90-110 parts of styrene-acrylic emulsion, 15-25 parts of ion exchange silica sol, 10-15 parts of large-particle-size silica sol, 15-25 parts of water, 30-50 parts of ethanol, 2-4 parts of n-butyl alcohol and 0.4-0.6 part of sodium polystyrene sulfonate. The preparation method comprises the following steps: a, by taking styrene-acrylic emulsion with the pH value of 8-9 as a base material, slowly doping silica sol, stirring for 1 hour at a rotating speed of 500rpm, and uniformly mixing materials; b, then adding mixed solution of water and ethanol, slowly adding a n-butyl alcohol defoaming agent, and stirring for 20 minutes at a low speed; and c, finally adding water diluted solution of sodium polystyrene sulfonate, stirring for 10 minutes at a low speed, then filtering by virtue of a 300-mesh filter net, standing, and defoaming for later use. Therefore, the coating has multiple advantages of antistatic property, antiblocking property, good weather resistance, high printing color density, low flexibility and improved paper feeding passing rate of a printing medium, the coating is easy to process and manufacture, and batch production can be carried out.

Description

technical field [0001] The invention relates to the field of printing technology, in particular to a smooth coating with antistatic properties, good weather resistance, high printing color density, low flexibility, low coefficient of friction, anti-blocking and a preparation method thereof. Background technique [0002] Laser printing is a printing technology developed in the 1960s. Its principle is like copying. It uses laser beams to quickly "project" digital graphics or documents onto a photosensitive surface (photosensitive drum), and the position hit by the laser beam will be The phenomenon of electronic discharge occurs, and then due to electrostatic action, some fine "toner" is attracted like a magnet, and the printing effect comes out; the toner will be transferred from the photosensitive drum to the printing medium; roller, so the toner is "fixed" to the surface of the print media. [0003] With people's pursuit of color, laser printers have also developed from sin...

AI Technical Summary

Problems solved by technology

[0003] With people's pursuit of color, laser printers have also developed from single black toner printing to CMYK multi-color color printing; now some special coating technologies that can be used for color printing have appeared on the market; at the same time, in order to meet weather resistance, Due to the use requirements such as moisture resistance, the substrate of printing media has also developed from the most common paper to PET film; however, the printing adaptability of the new substrate still needs to be improved; the most prominent factor affecting the printing adaptability is mainly toner Loading capacity and paper passing rate; first of all, most laser printers on the market now use ordinary cheap copy paper, coated paper, etc. as printing media; The carrying capacity of toner is limited, and the adhesion fastness of color toner to its surface is poor, which is far from meeting the output quality requirements of color laser printers; after printing, color graphics often appear toner, color, etc. due to insufficient toner carrying capacity. adverse phenomenon; therefore, in order to achieve color printing, the toner loading capacity requirements of the coating will also be greatly increased; secondly, in order to pursue higher printing speeds, laser printing machine giants led by Fuji Xerox and Canon continue to carry out technological innovations , to increase the color output speed from 40 pages per minute of the Fuji Xerox Phaser6360 machine in 2007 to hundreds of pages per minute now; this puts forward new requirements for the paper passing rate of printing media; the paper passing rate is low The most prominent performance is: when the laser printing film is printed on a color high-speed laser printer, there is often adhesion between the films; When the transmission device of the printer enters the printing system, it will be blocked; this will seriously affect the printing production efficiency, and may damage the printer components and damage the service life of the printer; however, the existing PET film on the market is not suitable for this There has been no effective solution to the sticking problem, which has always troubled the majority of users

However, its biggest problem is that the cost is too high; moreover, the polytetrafluoroethylene aqueous dispersion is mostly milky white or yellowish liquid, which inevitably affects the performance of the product such as appearance and light transmittance.

[0014] The color high-speed laser printing film with smooth performance in the prior art has only adopted the above two or more solutions; however, it cannot fundamentally solve the problem of poor paper feeding of the medium used in color high-speed laser printers.

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