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Preparation method and application of barrier hydrophobic paper-based paint

A coating and paper-based technology, applied in the field of preparation of barrier hydrophobic paper coatings, can solve the problems of environmental pollution, complex operation process, toxic and harmful organic solvents, etc. Effect

Active Publication Date: 2019-04-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN201810193953.2 reports a method for surface hydrophobic modification of nanofibril cellulose, which uses alkenyl succinic anhydride or alkyl ketene dimer to replace some of the hydrophilic groups such as hydroxyl and carboxyl in nanocellulose group, grafted on the surface of nanocellulose, so as to achieve the purpose of changing the surface energy of nanofibers, making it change from superhydrophilic to hydrophobic, and the maximum contact angle reaches 118°, but toxic and harmful organic solvents are used in the operation process , will cause pollution to the environment
Patent CN201710000299.4 reports a preparation method of hydrophobically modified nanocellulose, which uses acrylamide to react with nanocellulose, and reacts with hydrophobic compounds in an organic solvent system to obtain hydrophobically modified carboxyethyl fiber It can be applied to paper-based packaging, but toxic and harmful organic solvents are used in the operation process, which will cause environmental pollution
Patent CN201710734678.6 reports a method for modifying nanocellulose crystals by chemically bonding KH560. This method uses the ring-opening of the epoxy group of KH560 to react with the hydroxyl groups on the surface of nanocellulose, so that KH560 is chemically bonded to nanocellulose. The surface of cellulose crystals can be used to obtain hydrophobically modified samples, but the operation process is extremely complicated, the reaction conditions are harsh, and it is difficult to control

Method used

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  • Preparation method and application of barrier hydrophobic paper-based paint

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Embodiment 1

[0048] see figure 1 , the preparation method of a kind of barrier hydrophobic paper-based coating provided by the invention, it comprises the following steps:

[0049] (1) Preparation of modified nanocellulose:

[0050] (1.1) Prepare the raw materials of following components according to weight percentage:

[0051] Nanocellulose fibers: 5-40%

[0052] n-Hexyltrimethoxysilane: 20-60%

[0053] Alcohol solvent: 15-30%

[0054] Water: 10-25%;

[0055] (1.2) Preparation of hydrolyzate: first stir the alcohol solvent and water at high speed, when heated to a certain temperature, add n-hexyltrimethoxysilane, condense and reflux, react at constant temperature, the speed of high-speed stirring is 800-1500 rpm, heat The temperature is 30-80°C, and the constant temperature reaction time is 2-5 hours to obtain a hydrolyzate;

[0056] (1.3) Preparation of modified nanocellulose: After step (1.2) is completed, add nanocellulose fibers dropwise to the above solution, then start the mag...

Embodiment 2

[0088] Present embodiment is substantially the same as embodiment 1, and the weight percent of its concrete component is:

[0089] Modified Nanocellulose: 16.7%

[0090] Water-based acrylate emulsion: 83.3%;

[0091] The modified nanocellulose described therein comprises the following components by weight percentage:

[0092] Nanocellulose fibers: 16%

[0093] n-Hexyltrimethoxysilane: 48%

[0094] Alcohol solvent: 15%

[0095] Water: 21%;

[0096] The finished product of the barrier hydrophobic paper-based coating includes the following components in weight percent: 2.7% of nanocellulose fibers, 8.0% of n-hexyltrimethoxysilane, 2.5% of isopropanol, 3.5% of water, and 83.3% of pure acrylic emulsion.

[0097] The specific steps are: first stir 2.5% isopropanol and 3.5% water at a high speed, and when heated to a certain temperature, add 8.0% n-hexyltrimethoxysilane, condense and reflux, and keep the temperature constant For the reaction, the rotating speed of the high-spee...

Embodiment 3

[0106] The method and product provided in this embodiment are basically the same as those in Examples 1 and 2, the difference being that the weight percent of its components is:

[0107] Modified Nanocellulose: 9.1%

[0108] Water-based acrylate emulsion: 90.9%;

[0109] The modified nanocellulose described therein comprises the following components by weight percentage:

[0110] Nanocellulose fibers: 10%

[0111] n-Hexyltrimethoxysilane: 40%

[0112] Alcohol solvent: 26%

[0113] Water: 24%;

[0114] The finished product of the barrier hydrophobic paper-based coating includes the following components in weight percent: 1.5% of nanocellulose fiber, 4.3% of n-hexyltrimethoxysilane, 1.4% of isopropanol, 1.9% of water, and 90.9% of pure acrylic emulsion.

[0115] The specific steps are: first stir 1.4% isopropanol and 1.9% water at high speed in parts by mass, and then add 4.3% n-hexyltrimethoxysilane in parts by mass when heated to a certain temperature, condense and reflux, ...

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Abstract

The invention provides a preparation method of barrier hydrophobic paper-based paint. The preparation method comprises the following steps of (1) preparation of modified nanocellulose, wherein hexyltrimethoxysilane is hydrolyzed, an alcohols solvent is prepared, and nanocellulose fiber is added after stirring; (2) preparation of the barrier hydrophobic paper-based paint, wherein the modified nanocellulose is added into an aqueous acrylate emulsion for mechanical blending. The invention discloses the barrier hydrophobic paper-based paint by implementing the method. The barrier hydrophobic paper-based paint comprises the modified nanocellulose and the aqueous acrylate emulsion. The invention also discloses an application method of the paint. The method has the advantages that the environmental protection is achieved, the manufacturing process is simple, the cost is low, and the efficiency is high. The paint has excellent hydrophobic and air-blocking properties, and expands the application of food wrap paper in food packaging. In addition, the application method is simple and convenient, and the application range is wide.

Description

technical field [0001] The invention belongs to the technical field of water-based coatings, in particular to a preparation method and application of a barrier hydrophobic paper coating. Background technique [0002] Among the four major packaging materials of paper, plastic, glass, and metal, paper packaging materials are biodegradable and the most environmentally friendly, and their consumption accounts for 50% of the total consumption of packaging materials. However, the paper itself is loose and porous and does not have barrier properties, which requires post-processing of the paper to make it have barrier properties. Generally, the methods for obtaining barrier properties of paper include dipping processing, composite technology and barrier coating. The first two methods are more difficult for paper recycling, so the current development trend is to use barrier coatings for coating. Barrier coatings usually include extrusion coating, wax coating, and water-based polymer...

Claims

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Application Information

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IPC IPC(8): D21H19/14D21H19/34D21H19/20D21H19/16D21H21/16D21H21/14
CPCD21H19/14D21H19/16D21H19/20D21H19/34D21H21/14D21H21/16
Inventor 施利毅杭建忠
Owner SHANGHAI UNIV
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