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Red color paste applied to rollerball pen and rollerball pen ink
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A gel pen and red technology, applied in the field of red colorants, can solve the problems of poor thermal stability, easy delamination and precipitation of ink, and achieve the effect of good thermal stability and stable system.
Inactive Publication Date: 2018-12-21
TAIYUAN UNIV OF TECH
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[0005] At present, the organic red pigments of color lakes, such as PR.48, PR.57, etc., are easier to be sanded, but the thermal stability of the ink prepared with this color paste is relatively poor; the sanding color paste of other organic red pigments is easy to grind. Separation, precipitation, especially with strong electron-withdrawing functional groups at the end of the molecule, such as -NO 2 ,-CONH 2 , -COR, etc.
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[0050] The present invention also provides the preparation method of the above-mentioned red color paste suitable for gel pen and water-based pen ink preparation, comprising the following steps:
[0051] (1) Dissolve hyperdispersant, wetting agent, defoamer, and solvent in deionized water first, add pigment to make it fully wet, and disperse at high speed for half an hour.
[0052] (2) Add resin and preservative to the above mixture, adjust pH agent, and stir evenly.
[0053] (3) Transfer the mixture in the above step (2) to a sand mill for circular sand milling for 2-4 hours (0.3-0.6 mm zirconia beads, 70% filling rate, 2500 r / min speed).
[0054] (4) The discharge is filtered to obtain red color paste.
[0055] (5) Performance testing: measure the particle size of the red pulp with a particle size analyzer, and measure the viscosity with a viscometer. Place the red pulp in a constant temperature and humidity box (temperature 50°C, humidity 60%) and measure its particle size a...
Embodiment 1
[0063] Implement a kind of preparation method that is applicable to the preparation of the red color paste of gel pen and water-based pen ink preparation, comprise the following steps successively:
[0064] (1) Dissolve 3% hyperdispersant, 0.5% wetting agent, 0.5% defoamer, and solvent in deionized water, add 20% pigment PR.170 to make it fully wet, and disperse for half an hour with high-speed shearing.
[0065] (2) Add 16% resin, 0.2% preservative, and 1% PH agent to the above mixture, and stir evenly.
[0066] (3) Transfer the mixture in the above step (2) to a sand mill for circular sand milling for 3 hours (0.3-0.6 mm zirconia beads, 70% filling rate, 2500 r / min speed).
[0067] (4) The discharge is filtered to obtain red color paste.
[0068] (5) Test the performance of the prepared red paste: the particle size of the red paste is D50 66nm, D100 190nm, and the viscosity is 83cps; after being placed in a constant temperature and humidity box for 3 months, the particle si...
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Abstract
The invention discloses red color paste applied to a rollerball pen and rollerball pen ink. The red color paste is prepared from an organic red pigment, resin, a hyperdispersant, a wetting agent, a defoaming agent, a preservative, a pH regulator, a water-soluble organic solvent and deionized water, wherein the particle sizes of pigment particles are D50 smaller than or equal to 80 nm and D100 smaller than or equal to 250 nm. The red color paste has the advantages of stable system, no agglomeration, no precipitation and layering, good thermal stability, long-term storage and suitability for preparing following-up rollerball pens and rollerball pen ink.
Description
technical field [0001] The invention relates to a red color paste for ballpoint pen ink, in particular to a red color paste for gel pen and water-based pen ink preparation. Background technique [0002] Ink is divided into pigment ink and dye ink according to the color material. The pen made of dye ink is smooth, but it is not resistant to water, light, easy to fade, and cannot be stored for a long time; and pigment ink, due to the nature of the pigment itself, so It is water-resistant, light-resistant, non-fading, and the writing lines are preserved for a long time. [0003] The key to formulating pigment-based inks with good stability is the preparation of color paste with good performance. The preparation process of color paste is mainly to disperse and stabilize the pigment particles. Smooth, long-term storage of color paste will not cause quality problems such as delamination and precipitation. [0004] Compared with carbon black, the original particle size of red org...
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