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Anionic nano wax emulsion as well as preparation method and application thereof

A technology of wax emulsion and anion, which is applied in the field of anionic nano wax emulsion and its preparation, can solve the problems of affecting the yield, affecting the quality of printing, uneven dispersion of wax, etc., achieving high yield, economical use, and avoiding environmental pollution Effect

Inactive Publication Date: 2015-02-04
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On the other hand, due to the strong hydrophobicity of the wax itself, it is not easy to disperse evenly in the water phase.
This kind of situation is likely to cause a prominent problem, that is, the dispersion of the wax is uneven or cannot be stored stably within a certain period of time after dispersion, and it is easy to form aggregations of large particles, so that the composition of the toner particles is uneven when they are aggregated, which cannot meet the requirements for brightening. and film release requirements, which affect the quality of printing; in addition, a large amount of waste powder is generated, which affects the yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment one: the preparation of nano wax emulsion

[0038] In the 500 ml reactor, add 20 grams of polyethylene wax (model is 400, melting point MP81°C), 1 gram of Pingpingjia O-20 and 2 grams of sodium dodecylbenzenesulfonate, heated to 95°C, stirred (500rpm) for 2 hours until completely mixed;

[0039] Slowly add 175 milliliters of deionized water containing 1 gram of sodium dodecylbenzenesulfonate, process it with an emulsifier (10,000 rpm) at 100° C., emulsify twice, each time for 5 minutes, and then vigorously stir (1,000 rpm) for 1 hour. Rapid cooling to room temperature prevents the wax droplets from aggregating at high temperatures, and can obtain a stable nano-wax emulsion. Its average particle diameter is 90nm and its solid content is 10wt.% as measured by the Malvern laser particle size analyzer. The prepared nano-wax After the wax emulsion is left standing for 15 days, the nano-wax emulsion will not delaminate and can exist stably, and the particle size ...

Embodiment 2

[0040] Embodiment two: the preparation of nano wax emulsion

[0041] In a 500ml reactor, add 40g of beeswax (melting point MP63°C), 1.5g of Pingpinga O-20, 2g of sodium lauryl sulfate and 0.5g of Span 80, heat to 90°C, and stir (600rpm) for 1 hour until complete well mixed;

[0042] Then slowly add 155 ml of deionized water containing 1 gram of sodium lauryl sulfate, process it with an emulsifier (20000 rpm) at 90 ° C, emulsify twice, each time for 5 minutes, and then vigorously stir (2000 rpm) for 1 hour; make it cool quickly To room temperature, to prevent wax droplets from aggregating at high temperature, a stable nano-wax emulsion can be obtained, with an average particle size of 100nm and a solid content of 20wt.% as measured by a Malvern laser particle size analyzer. After the prepared nano-wax emulsion is left to stand for 15 days, the nano-wax emulsion does not appear delamination phenomenon and can exist stably, and the particle size distribution of the nano-wax emu...

Embodiment 3

[0043] Embodiment three: the preparation of black toner

[0044] In the pressure reactor of 500 milliliters, add the prepared nano-wax emulsion (15 grams, 20wt.%) of embodiment two, resin emulsion (150 grams, 20wt.%, commercially available), carbon black water-based dispersion ( 40 grams, 15wt.%, commercially available product) and charge regulator zinc salicylate water-based dispersion (5 grams, 10wt.%, commercially available product), add 1 gram of sodium dodecylbenzenesulfonate 100 grams of deionized water, mix well;

[0045] Adjust the pH value of the system to about 1, and heat to 60°C, vigorously stir (5000rpm) for 2 hours, raise the temperature to 95°C and stir for 5 hours; cool, filter, wash, and dry to obtain toner (powder particles in a nearly spherical shape , the average particle size is 8 μm), and then add a fluidity enhancer (such as: 20nm modified silica, the product model is Degussa 202) and other external additives to obtain black toner suitable for laser p...

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PUM

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Abstract

The invention relates to a stable anionic nano wax emulsion as well as a preparation method and application thereof. The preparation process of the nano wax emulsion comprises the following steps: (1) heating wax and a surfactant until the temperature is greater than the melting point of the wax, and then stirring until the wax and the surfactant are uniformly mixed; (2) adding an aqueous solution of the surfactant into a system of the step (1), performing emulsification reaction, and continuously stirring after the reaction is ended until the system is cooled to room temperature so as to obtain the nano wax emulsion. The preparation process is safe, simple and environment-friendly; the prepared anionic nano wax emulsion can be stably stored; when the anionic nano wax emulsion is applied to a gathering and combining method, colored ink powder which is high in yield and can meet the requirement on high-quality laser printing or electrostatic copying (such as brightening and demolding) can be obtained.

Description

technical field [0001] The invention belongs to the field of wax emulsion and its preparation, and in particular relates to an anionic nano-wax emulsion and its preparation method and application. Background technique [0002] Toner (also known as toner or toner, Toner) is the main consumable for laser printing or electrostatic copying. Its basic components include resin, pigment, lubricant (wax) and charge control agent (CCA), etc., with resin as the main body (generally 70–90wt.%) chargeable powder material. [0003] The preparation method of toner includes physical method and chemical method. The toner particles prepared by chemical methods have excellent performance (regular spherical or ellipsoidal shape, uniform composition and narrow particle size distribution range), suitable for the preparation of high-quality toner, and have the advantages of low energy consumption in the production process, so they are favored by the market. of favor. The aggregation step of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08
Inventor 樊新衡李刚续守民杨联明
Owner INST OF CHEM CHINESE ACAD OF SCI
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