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Water-borne non-ionic polyurethane antistatic coating and preparation method and application thereof

A non-ionic polyurethane, anti-static technology, used in polyurea/polyurethane coatings, coatings, conductive coatings, etc., can solve the problem that cannot meet the physical properties and triboelectric charging properties of water-based polyurethane, and cannot meet the requirements of printers and other electrophotographic equipment. and other problems, to achieve the effect of flexible and variable addition amount, good triboelectric charging performance, and adjustable triboelectric charging amount

Active Publication Date: 2015-07-08
SHENZHEN LEPUTAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technologies provided in the above materials cannot meet the good physical properties and triboelectric properties required in the field of water-based polyurethane, so that they cannot meet the requirements of printers and other electrophotographic equipment.

Method used

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  • Water-borne non-ionic polyurethane antistatic coating and preparation method and application thereof
  • Water-borne non-ionic polyurethane antistatic coating and preparation method and application thereof
  • Water-borne non-ionic polyurethane antistatic coating and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0046] See figure 1 The present invention provides a method for preparing the above-mentioned water-based non-ionic polyurethane antistatic coating, which includes the following steps:

[0047] (1) Preparation of water-based non-ionic polyurethane emulsion:

[0048] Add 20-40% isocyanate and 50-70% polyol to the reaction kettle in sequence, and stir and react at 80-100°C for 1-3 hours to obtain isocyanate prepolymer;

[0049] The obtained isocyanate prepolymer is cooled to 45-55°C, and then 5-15% non-ionic hydrophilic chain extender, 5-15% small molecule chain extender and the total amount of the above mixture are 30-100% low Chain extension with boiling point solvent to obtain polyurethane solution;

[0050] After high-speed shearing, it is emulsified in water (concentration 1%) containing a salt-forming agent, and the low-boiling point solvent is removed in a vacuum to obtain an aqueous non-ionic polyurethane emulsion.

[0051] (2) Preparation of water-based non-ionic polyurethane an...

Embodiment 1

[0059] (1) Preparation of water-based non-ionic polyurethane emulsion:

[0060] Add 23.0g of toluene diisocyanate and 67.5g of water-soluble polyoxyethylene glycol 2000 into the reaction kettle successively, stir and react at 80-100℃ for 1-3 hours to obtain isocyanate prepolymer; lower the temperature to about 45℃, Add 3.7g diethylene glycol, 5.8g triethanolamine and appropriate amount of acetone for chain extension to obtain polyurethane solution; emulsify in water containing salt-forming agent through high-speed shearing, remove low-boiling solvent in vacuum, and finally obtain water-based Ionic polyurethane emulsion.

[0061] (2) Preparation of water-based non-ionic polyurethane antistatic liquid:

[0062] In the water-based non-ionic polyurethane emulsion obtained in step (1), 10wt% conductive carbon black, 5wt% water-based quaternary ammonium salt antistatic agent, 1wt‰ wetting agent BYK 344, 1wt‰ are added at a lower stirring speed Leveling agent TEGO410 is a water-based non-...

Embodiment 2

[0067] (1) Preparation of water-based non-ionic polyurethane emulsion:

[0068] Add 35.0g of isophorone diisocyanate and 57.2g of water-soluble polyoxyethylene glycol 1000 to the reaction kettle successively, stir and react at 80-100℃ for 1-3 hours to obtain isocyanate prepolymer; lower the temperature to about At 50℃, add 4.8g diethylene glycol, 3.0g triethanolamine and appropriate amount of acetone for chain extension to obtain polyurethane solution; high-speed shear emulsification in water containing salt-forming agent, vacuum removal of low-boiling solvent, and finally Water-based non-ionic polyurethane emulsion.

[0069] Steps (2) and (3) are the same as in Example 1, and the specific test data are shown in Table 1.

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Abstract

The invention provides a water-borne non-ionic polyurethane antistatic coating. The water-borne non-ionic antistatic polyurethane coating is prepared from the following components in weight percent (wt%): 50-95wt% of water-borne non-ionic polyurethane emulsion, 3.5-30 wt% of conductive carbon black, 0.5-10wt% of water-borne antistatic agent and 1-10wt% of additives. A preparation method of the water-borne non-ionic polyurethane antistatic coating comprises the following steps: adding isocyanate and a polyol into a reactor in sequence, stirring to make the isocyanate and the polyol react to generate an isocyanate prepolymer, adding a non-ionic hydrophilic chain extender and a low-boiling-point solvent to extend chains to obtain polyurethane solution, emulsifying under the action of high-speed shear force, removing the low-boiling-point solvent in vacuum to obtain water-borne non-ionic polyurethane emulsion, adding the conductive carbon black, the water-borne antistatic agent and the additives, stirring and mixing at a low speed to obtain water-borne non-ionic polyurethane antistatic solution, spraying the water-borne non-ionic polyurethane antistatic solution onto the surface of a product needing to the coated, and baking. The water-borne non-ionic polyurethane antistatic coating prepared by adopting the preparation method has excellent performances, can be stored stably, can be adjusted in the electric quantity and the spraying amount flexibly and can be applied to printers and other electronic photographic equipment.

Description

【Technical Field】 [0001] The invention relates to the field of materials for printers, in particular to an aqueous polyurethane coating which can be triboelectrically developed with toner and a preparation method thereof, and is applied to electrophotographic and printer developing rollers. 【Background technique】 [0002] Water-based polyurethane is non-toxic and non-polluting, and its hardness, gloss, adhesion and other properties are equivalent to solvent-based polyurethane. Therefore, the research and development of water-based polyurethane has received widespread attention from all over the world. At present, among waterborne polyurethanes, there are more researches on carboxylic anionic polyurethane emulsions than nonionic polyurethane emulsions. [0003] In the printer electrophotographic system, the process of developing and printing is completed by relying on constant friction and electrification between the developing roller and toner. The printing quality of the printer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D7/12C09D5/24C08G18/10G03G15/08
Inventor 孙变张永威孟鸿李绍昌周宏辉羊辉
Owner SHENZHEN LEPUTAI TECH CO LTD
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