Block polymer capable of being used as white board pen ink dispersing agent and white board pen ink

Abstract

The invention discloses a block polymer capable of being used as white board pen ink dispersing agent and white board pen ink. The block polymer is prepared by a monomer A with m mole and a monomer B with n mole, and molecular weight of the block polymer is 15000-19000, wherein 60%<=m / (m+n)<=95%; the monomer A is an oil-soluble olefin monomer, and the monomer B is a water-soluble or alcohol-soluble chain segment. The white board pen ink is obtained by the following preparation method: dissolving the block polymer in organic solvent, adding pigments or oil-soluble dyes, removing the solvent, and adding water or alcohol solvent to obtain liquid A; dissolving an alcohol- / water-soluble polymer in the water / alcohol solvent, and adding auxiliaries to obtain liquid B; and pouring the liquid B into the liquid A to obtain the white board pen ink. The block polymer enables weak-polar pigments or the oil-soluble dyes to be dispersed in polar solvent stably, thereby achieving stability of the ink. The block polymer enables the pigments or the oil-soluble dyes to be wrapped in a resin system through bridging action, thereby achieving completely non-trace wiping.

Description

technical field [0001] The invention belongs to the field of functional macromolecular materials, and in particular relates to a block polymer which can be used as a dispersant for whiteboard pen ink and whiteboard pen ink. Background technique [0002] Whiteboard pen ink is a kind of color ink that uses organic solvent as ink, resin as film-forming substance, oily dye as colorant, and other additives as auxiliary components. It has the characteristics of dust-free and easy to wipe. It is matched with a special writing pen. It has writing characteristics that other inks do not have, and is easy to carry, beautiful in appearance and rich in color. It is widely used in office and academic exchanges, meetings and other occasions. Whiteboard pen ink is a new product of writing ink, which is expected to replace traditional chalk in some occasions. [0003] Japan's Oki Electric Company first developed this type of product, and subsequently, some companies in Switzerland and the U...

AI Technical Summary

Problems solved by technology

[0007] Chinese patents CN 1962772A and CN1974692A used polymer polymer dispersant when preparing whiteboard pen ink, but the name of polymer dispersant was not specified in the patent

[0010] However, on whiteboards, especially matte whiteboards with rough surfaces, since the pigments are scattered into the micropores on the surface, if the film-forming resin cannot completely wrap the pigments and easily peel off from the whiteboard, it will be difficult to achieve no trace of erasing ideal state

Moreover, the general surfactants (high and low molecular weight) currently used only make the whole system in a metastable state, which has limited improvement in ink stability, color and other properties.

In addition, the current reports do not take into account the environmental protection issues of the solvent requirements of the dispersant in the process of preparing the whiteboard pen ink. The development of a new type of high-efficiency pigment dispersant can make the pigment in the low-toxic and low-irritant environment-friendly solvent system such as alcohol and water. Achieve good dispersion, used in the preparation of whiteboard pen ink, not only make the pigment dispersed stably in the whole system, but also realize the greening of the whiteboard pen ink preparation process

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