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Hydrophobic slurry as well as preparation method and application thereof

A hydrophobic and slurry technology, which is applied in the direction of paper coating, water-repellent agent addition, pigmented coating, etc., can solve the problems of unfavorable environmental protection, harsh preparation conditions, non-biodegradable, etc., achieve excellent hydrophobic performance, easy preparation, The effect of simple method

Active Publication Date: 2020-04-28
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the current research on water-based coatings mostly uses modified resins (epoxy-modified alkyd resins, methyl etherified amino resins, acrylic resins, water-based polyurethanes, etc.), whose composition is complex, and the steps in the synthesis engineering are cumbersome and the conditions It is harsh, consumes a lot of energy, and most of them are not biodegradable. In addition, organic solvents, various pigments and a large number of additives (defoamers, leveling agents, wetting agents, dispersants, etc.) are mostly used in the preparation, The cost is high, and it is not conducive to environmental protection
In addition, in the prior art, there is also a plan to prepare cellulose-based hydrophobic coatings by hydrophobically modifying cellulose. However, in the process of modifying cellulose, a large amount of organic reagents are required, and the preparation conditions are harsh. Not only pollutes the environment and is harmful to the human body

Method used

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  • Hydrophobic slurry as well as preparation method and application thereof
  • Hydrophobic slurry as well as preparation method and application thereof
  • Hydrophobic slurry as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] This embodiment provides a kind of hydrophobic slurry, which is specifically prepared by the following steps:

[0064] Add 3g (dry weight) nanocellulose (particle size 1-50nm; aspect ratio 100-200) into 200g deionized water, stir and disperse at room temperature 25°C, then add 0.2g sodium lauryl sulfate, and then carry out Stir at high speed at 4500 rpm for 8 minutes, then add 4 g of stearic acid, heat to 85 degrees Celsius, and then carry out stirring and emulsification. The rotation speed of stirring and emulsification is 10,000 rpm, and the emulsification time is 10 minutes. The particle size is 1.18 microns, and the PDI is 0.91. After 20 days at 25°C, there is no obvious change in appearance, the particle size is 1.21 microns, and the PDI is 0.94. It can be seen that the emulsion particles in the hydrophobic slurry prepared in this example are small and stable Good sex.

[0065] After freeze-drying the hydrophobic slurry prepared above, carry out electron microscop...

Embodiment 2

[0071] This embodiment provides a hydrophobic pulp and hydrophobic paper, which are prepared in the same way as in Embodiment 1, except that hydroxyethyl cellulose (DP of 180) is used instead of nanocellulose.

[0072] The prepared Pickering-type hydrophobic slurry is a milky white uniform liquid, in which the particle size of the milk particles is 1.26 microns, and the PDI is 0.86. After 20 days at 25°C, the appearance is milky white liquid but there is layering at the bottom. After shaking and mixing evenly , the emulsion was restored to its original state, the particle size was 1.53 microns, and the PDI was 0.98.

Embodiment 3

[0074] This embodiment provides a kind of hydrophobic slurry and hydrophobic paper, and its preparation method is the same as that of Example 1, the only difference is that the solid particles used in this embodiment are 1g of nanocellulose and 2g of microcrystalline cellulose (DP for 220).

[0075] The prepared Pickering-type hydrophobic slurry is a milky white uniform liquid, in which the particle size of the milk particles is 0.98 microns, and the PDI is 0.86. After 20 days at 25°C, there is no obvious change in appearance, the particle size is 1.07 microns, and the PDI is 0.90.

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Abstract

The invention relates to the technical field of high polymer materials, and particularly discloses hydrophobic slurry as well as a preparation method and application thereof, wherein the hydrophobic slurry is Pickering type hydrophobic slurry, the hydrophobic slurry comprises solid particles, water and a solid hydrophobic substance, and the solid hydrophobic substance is embedded in the solid particles in a particle form. Through a Pickering emulsion type particle emulsifying technology, the solid hydrophobic substance particles are embedded in solid particles to form spherical particles, milkwhite hydrophobic slurry with uniform and stable properties is prepared, and high hydrophobicity and water resistance can be provided for a to-be-applied base material. The invention also provides the preparation method of the hydrophobic slurry, and the method is simple and convenient, and is beneficial to industrial production. The invention also provides hydrophobic paper which comprises the hydrophobic slurry, is simple and convenient to prepare and has good hydrophobic performance.

Description

technical field [0001] The invention relates to the field of polymer materials. Specifically, it relates to a hydrophobic slurry and its preparation method and application. Background technique [0002] Hydrophobicity is an important surface property of materials. Providing hydrophobic properties to solid materials in different ways can enable them to have new additional functions and obtain wider applications. There are many ways to provide hydrophobicity to the surface of the material, one of which is to coat a layer of hydrophobic coating on the surface of the material to make the material have hydrophobicity. Hydrophobic coatings can be divided into two categories: organic systems and water systems. Water-based hydrophobic coatings are more and more environmentally friendly because they do not contain organic solvents and are therefore more and more used. [0003] At present, the current research on water-based coatings mostly uses modified resins (epoxy-modified alkyd...

Claims

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Application Information

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IPC IPC(8): D21H19/52D21H19/46D21H19/62D21H19/64D21H21/16
CPCD21H19/52D21H19/46D21H19/62D21H19/64D21H21/16
Inventor 吴敏黄勇李金培刘金凤陈茜
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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