Erasable gel ink and preparation method thereof

Abstract

The invention provides an erasable gel ink which consists of the components as follows: (a) 5-40 parts by weight of temperature sensitive dye; (b) 0.5-5 parts by weight of wetting and dispersing agent; (c) 0.1-8 parts by weight of thickening agent; (d) 0.1-5 parts by weight of adhesion promoter; and (e) 5-30 parts by weight of moisture lubricant; (f) 0.05-0.5 parts by weights of antiseptic anti-mildew agent; (g) 15-85 parts by weight of water. Total weight of the components (a)-(g) accounts for 98-100% of the entire compound weight. The invention also provides a preparation method of the gel ink and a product employing the gel ink of the invention.

Description

technical field [0001] The invention relates to an ink and a preparation method thereof, in particular to an erasable neutral ink and a preparation method thereof. Background technique [0002] Neutral ink is widely used for permanent document preservation because of its smooth and smooth writing feel, no ink bleeding or ink leakage; writing resistance to light, water, temperature and chemical stability (acid resistance, alkali resistance, strong oxidant resistance, bleaching agent, etc.). Be accepted by people. However, it is inevitable that mistakes will occur when writing, and correction fluid must be used for writing. However, it is inconvenient to use correction fluid products and the toxicity of correction fluid has gradually attracted people's attention. [0003] The current erasable inks are as follows: [0004] The first is to wrap dyes or pigments with polymer rubber substances to volatilize the solvent, and the rubber substances form a film attached to the writi...

AI Technical Summary

Problems solved by technology

[0004] The first is to wrap dyes or pigments with polymer rubber substances to volatilize the solvent, and the rubber substances form a film attached to the writing interface, and the oil-soluble ballpoint pen erasable ink that can be wiped off with a rubber, because of the use of volatile organic solvents, Production and use are unsafe and environmentally friendly

[0005] The second is magic neutral ink. The erasability of this ink is based on the principle of acid-base color development-fading, so there are usually two pens, one is used for writing color development, and the other is used for correction. , the color will fade away, this kind of ink is inconvenient to use, and it needs to be equipped with two pens, and it is often impossible to use the same color developing pen to write again in the place where the erased characters are erased

However, it is difficult to apply temperature-sensitive pigments encapsulated in microcapsules to neutral ink systems

The reason is that when the temperature-sensitive pigment is applied to the neutral ink system, the following problems will be brought about: the wettability of many wrapping materials in the neutral ink is very poor, and it is difficult to uniformly wet and disperse it stably, making the ink's The shelf life is very short, and there are often serious quality problems such as failure to write when starting a pen, or ink layering after a long period of storage, causing clogging of the nib and failure to write.

[0007] In addition, because the temperature-sensitive pigments used in the pen-making field are usually encapsulated in microcapsules on the outside, the particle size is about ten times larger than that of ordinary pigments, which makes the ink more likely to delaminate and cause poor writing

There are also more powerful grinding and dispersing to achieve the purpose of uniform dispersion, but because these temperature-sensitive pigments basically adopt microcapsule encapsulation technology, strong grinding and dispersing can easily break the outer shell material of the microcapsules and make the temperature-sensitive pigments wrapped inside At the same time, because some larger particles in the temperature-sensitive pigment particles cannot penetrate into the paper fiber pores, it is easy to be wiped off accidentally when writing

[0008] To sum up, the existing erasable gel pens on the market (without temperature-sensitive pigments) all need to be erased with an eraser or similar tools. An additional eraser is required

And when erasing with an eraser, if the force is improper, the writing interface (in most cases, paper) will be scratched and affect the readability and appearance of the whole operation or document; A miscellaneous waste of confetti that is unclean and unsightly

Therefore, there is a lack of a novel erasable neutral ink in this area, which has excellent performances such as erasing without an eraser, erasing clean writing, leaving no waste, and not damaging paper.

However, the temperature-sensitive pigments in the prior art are usually used in solvent-based systems, which are difficult to apply to neutral ink systems