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Modified resin for preparing static developing ink powder

A technology for modifying resins and toners, used in developers, electrographics, optics, etc., can solve the problems of high glass transition temperature, poor weather resistance, difficult softening point, etc., and achieve good fixability, high aging resistance, Strong anti-stick roll effect

Inactive Publication Date: 2012-05-23
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are certain defects in the characteristics of the existing styrene-acrylic resin products in the market, mainly because the styrene-acrylic resin in the market is difficult to meet the requirements of relatively low softening point and relatively high glass transition temperature for toner products, and the weather resistance is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0008] Example 1: 75 parts (by weight) of styrene-acrylic resin with a softening point of 105-110°C and a glass transition temperature of 48-50°C, 25 parts of a styrene-acrylic resin with a softening point of 150-155°C and a glass transition temperature of 70-72°C (weight ratio), 3 parts (weight ratio) of silicon dioxide powder, 120 parts (weight ratio) of magnetic powder. Put it into a high-speed mixer for dispersion and mixing, and then use a screw extruder to make the blend after dispersion and mixing to perform a mixing reaction. A modified resin mixture with a softening point of 120-125° C. and a glass transition temperature of 58-60° C. is obtained.

example 2

[0009] Example 2: 1. Get 50 parts (weight ratio) of styrene, 19 parts (weight ratio) of butyl acrylate, 3 parts (weight ratio) of benzoic acid peroxide, 1.5 parts (weight ratio) of two Vinylbenzene, 1 part (by weight ratio) of silica powder, and 5 parts (by weight ratio) of red pigment powder are placed in a mixing tank, mixed and dispersed evenly to form a compound.

[0010] 2. Stir and mix gelatin and starch with deionized water at a ratio of 1:10 to prepare release agents A and B.

[0011] 3. According to the ratio of mixture: deionized water = 1:3, add deionized water into the reaction kettle, add the above-mentioned release agents A and B while heating, and continue to heat while stirring evenly. When the temperature rises to At 80°C, keep the constant temperature for 3 hours.

[0012] 4. When continuing to stir the solution in the reaction kettle, add the above-mentioned mixture into the reaction kettle within 2.5 hours.

[0013] 5. Continue heating, raise the temperat...

example 3

[0015] Example 3: 1. Put 200 parts (weight ratio) of xylene and 10 parts (weight ratio) of silicon dioxide powder into a reactor to disperse and stir, and slowly heat up to boiling.

[0016] 2. Mix 70 parts (weight ratio) of styrene, 30 parts (weight ratio) of butyl acrylate, and 16 parts (weight ratio) of di-tert-butyl peroxide until uniform.

[0017] 3. Add the above-mentioned mixture dropwise to the boiling xylene solvent at a uniform speed for 4 hours, and then keep it under reflux temperature for 5 hours for reaction after dropping.

[0018] 4. Under the reflux state, slowly apply negative pressure, flash under reduced pressure, and gradually evaporate the xylene solvent.

[0019] 5. Release the vacuum, and release or press out the reactants from the reactor under normal pressure or under a small amount of nitrogen pressure.

[0020] 6. With 20 parts (weight ratio) reactants, 70 parts (weight ratio) styrene, 15 parts (weight ratio) butyl acrylate, 2 parts (weight ratio) ...

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Abstract

The invention discloses a modified resin for preparing static developing ink powder. The modified resin is prepared by the following steps of: adding one or more of treated silicon dioxide, magnetic powder, carbon black and pigment powder into the conventional styrene-acrylic resin for preparing the static developing ink powder in the weight ratio of (0.005-1.5):1 for modifying the conventional styrene-acrylic resin; dispersing powder into a monomer solution participating into the synthesis of the styrene-acrylic resin; and copolymerizing to form the modified resin. The modified resin can also be prepared by the following steps of: mechanically mixing the powder with a synthesized styrene-acrylic resin; and fusing and extruding to obtain the modified resin. The modified resin has the advantage that: the ink powder prepared from the modified resin has high fixing property, high roll coating resistance and high aging resistance.

Description

Technical field: [0001] The invention relates to a resin material, in particular to a modified resin material used in the production of electrostatic image toner. Background technique: [0002] With the development of office automation, especially in recent years, people's demand for colorized and high-speed office equipment continues to grow, and the demand for toner for xerographic copying and printers is huge. In order to meet the market demand, toner manufacturers at home and abroad have done a lot of work and investment in continuously improving the existing material technology, formula technology, equipment technology and production technology, and have also achieved relatively positive results. However, as the types and models of office equipment continue to expand and increase, how toner manufacturers can make good use of existing materials, equipment and related production technology conditions to produce economical and more comprehensive products that meet market r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/14C08K3/36C08K3/04C08F212/08G03G9/08
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