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A kind of preparation method of thixotropic thickener for ternary amphoteric neutral ink

A neutral ink, thixotropic technology, applied in the direction of ink, application, household appliances, etc., can solve the problems of poor durability, easy moisture absorption of handwriting, poor coordination of polyacrylamide thickening and thixotropy, etc. Effects of fastness, good writing, good moisture resistance and durability

Active Publication Date: 2015-10-28
CREATIVE WEALTH SHAOGUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Pu Yu from East China University of Science and Technology, etc., published "The Effect of Compound Thickener on the Rheological Properties of Neutral Ink" in the "Mechanical Engineering Materials" periodical 03, 2009. For the influence of the thickener on the performance of the neutral ink, the research shows that the composite thickener has good shear-thinning non-Newtonian fluid characteristics, but the pigment particle size and writing quality of the neutral ink of the thickening system The performance is obviously affected by the preparation temperature, and xanthan gum is easy to mildew
Feng Bohong of Taiyuan University of Technology's 2012 master's thesis "Research on the Rheology and Stability Influencing Factors of Neutral Ink". Good apparent viscosity and thixotropy, the handwriting written in medium ink prepared with this thickener is easy to absorb moisture, and the durability is poor in a humid environment
.Chinese patent: CN101649138A discloses a "preparation method of a high-stability neutral ink". The neutral ink prepared by this method uses polyacrylamide as a thickener. The coordination of denaturation is poor, and the stability of the prepared neutral ink is difficult to meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 300kg of 95% ethanol to a 1000L stainless steel reaction kettle equipped with a reflux condenser, flow-controllable high-level metering mixing tank, thermometer and stirring, turn on the reflux condenser and stir, heat up to 60°C for use;

[0024] Add 140kg of vinylpyrrolidone, 30kg of acrylic acid, 30kg of DMAEMA (dimethylaminoethyl methacrylate) and 1.5kg of phthaloyl peroxide into a stainless steel high-level metering mixing tank, mix well and set aside;

[0025] Under the condition of stirring, add the mixed reactive monomer mixed with phthalyl peroxide catalyst into the reaction kettle at a constant speed for 3 hours. Since the polymerization process is an exothermic reaction, the reaction temperature of the reaction system is strictly controlled within the range of 70±5°C;

[0026] After the feeding of the mixed reactive monomer is completed, dissolve 0.5kg of phthaloyl peroxide with 3kg of ethanol, add it to the reaction system at one time, and keep it warm f...

Embodiment 2

[0029] 400 kg of methanol was added to the 1000 L stainless steel reaction kettle in Example 1, and after the temperature was raised to 63° C., under stirring conditions, the reaction temperature was controlled at 70 ± 5° C., and 100 kg of vinylpyrrolidone, 50 kg of methacrylic acid, DMAPMA (N, The mixed monomer composed of N-dimethylaminopropyl methacrylamide) 50kg and 0.75kg azobisisobutyronitrile was added within 3 hours. After the addition was completed, 0.25kg azobisisobutyronitrile was used Dissolve 2kg of methanol, add it to the reaction system at one time, and keep it warm for 1.5 hours under the condition of stirring and 70±5°C; weigh 21kg of sodium chloroacetate, add it to the reaction kettle at one time, and keep it at 70±5°C Continue to stir and keep warm for 1 hour under the same conditions; measure the pH value of the reaction product with precision pH test paper, and neutralize the pH value of the reaction product to 6.6 with 30% NaOH. Reaction finishes, and coo...

Embodiment 3

[0031] In Example 1, 200 kg of industrial water was added to the 1000L stainless steel reactor. After the temperature was raised to 65° C., 120 kg of vinylpyrrolidone, 50 kg of sodium acrylate, DMAPAA (N, N-dimethylaminopropyl methacrylamide) were prepared in 3 hours. ) 30kg and 1.00kg tert-butyl hydroperoxide mixed monomer after adding, after the addition is completed, 0.33kg tert-butyl hydroperoxide is dissolved with 2kg methanol, and added to the reaction system in one go, stirring and Under the condition of 70±5℃, keep warm for 1.5 hours; add 13.5kg of chloroethanol into the reaction kettle at one time, and continue stirring for quaternization under the condition of 70±5℃ for 1 hour; measure the pH value of the reaction product with precision pH test paper , and neutralize the pH of the reaction product to 6.5 with 20% NaOH. Reaction obtains that solid content is 52.2% ternary amphoteric neutral ink thixotropic thickener polymer 420kg.

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Abstract

The invention provides a preparation method of a thixotropic thickening agent for ternary amphoteric neutral ink. The thixotropic thickening agent for the ternary amphoteric neutral ink is prepared by polymerizing a vinyl pyrrolidone main body reactive monomer accounting for 40-70% of the total weight of a reactive body, an acrylic acid reactive monomer which accounts for 15-30% of the total weight of the reactive body and is used for providing a negative ion function and a nitrogen-containing reactive monomer which accounts for 15-30% of the total weight of the reactive body and is used for providing a positive ion function in a free radical solution polymerization manner under the action of a catalyst by taking a hydroxyl-containing micromolecule polar compound as a polymerization reaction medium and then carrying out a quaternary ammonolysis reaction on liquid resin obtained after the polymerization reaction is completed. The thixotropic thickening agent for the ternary amphoteric neutral ink has good non-Newtonian fluid thixotropy and writing property, handwriting has good moisture resistance and durability and good water solubility, and relative light transmittance of 10% polymer aqueous solution and pure water is up to 97%.

Description

technical field [0001] The invention relates to a preparation method of neutral ink used in neutral ballpoint pens, in particular to a preparation method of a thixotropic thickener for ternary amphoteric neutral ink. Background technique [0002] The neutral ball-point pen prepared by neutral ink perfusion originated in Japan and is a novel writing instrument popular in the world at present. The gel pen has the advantages of both the fountain pen and the ballpoint pen. It is comfortable to write and easy to use. Neutral ink not only has a certain consistency and viscosity, but also needs to have thixotropy and strong pseudoplasticity. On the one hand, it can protect the dispersed pigment particles and have an independent stable structure, so as to ensure that the high viscosity of the ink in the refill can prevent the pen tip from leaking. The purpose of leaking, on the other hand, when writing, it can have a lower viscosity when the ball of the nib rotates and cuts the ink...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F226/10C08F220/06C08F220/34C08F220/60C08F8/44C09D11/18
Inventor 王正平罗浪陈丽佳孙兵杨许琼娜
Owner CREATIVE WEALTH SHAOGUAN