Method for preparing superhydrophobic coating by nano-crystalline cellulose template method

A nano-cellulose and super-hydrophobic coating technology, applied in the direction of cellulose coatings, coatings, etc., can solve the problems of poor water resistance and mechanical properties, achieve low surface energy, enhance hydrophobic properties, and guarantee the wear resistance of the coating film Effect

Active Publication Date: 2015-12-16
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention proposes a method for preparing a superhydrophobic coating by using the nanocellulose template method. Nano-TiO with controllable particle size ...

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  • Method for preparing superhydrophobic coating by nano-crystalline cellulose template method

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Embodiment 1

[0029] A method for preparing a superhydrophobic coating with a nanocellulose template method, comprising the steps of:

[0030] One, take microcrystalline cellulose as raw material sulfuric acid hydrolysis method to prepare nanocellulose solution, specific material dosage ratio is MCC:H 2 SO 4 =1: 8.45g / ml, react in a constant temperature water bath at 40°C for 95min. Add volume ratio to H 2 SO 4 :H 2 O=1:2.5 deionized water terminates the acid hydrolysis reaction. The sample was centrifuged at 6000r / m for 5min, the supernatant was poured off, the centrifugation was repeated 3 times, and ultrasonic treatment was performed at 70% power for 20min. Get nanocellulose solution (NCC); 2. Press V (TiCl 4 ):V(NCC)=1:10 will TiCl 4 Slowly drop into the nanocellulose solution, and stir mechanically at 70°C for 4 hours; 3. Add stearic acid dissolved in ethanol (according to adding TiCl 4 8% by mass), distilled water: absolute ethanol: stearic acid = 50: 4.5: 0.8, stirred at 70°C...

Embodiment 2

[0033] A method for preparing a superhydrophobic coating with a nanocellulose template method, comprising the steps of:

[0034] One, take microcrystalline cellulose as raw material sulfuric acid hydrolysis method to prepare nanocellulose solution, specific material dosage ratio is MCC:H2 SO 4 =1: 8.74g / ml, react in a constant temperature water bath at 40°C for 100min. Add volume ratio to H 2 SO 4 :H 2 O=1:2.8 deionized water terminates the acid hydrolysis reaction. The sample was centrifuged at 6000r / m for 5min, the supernatant was poured off, the centrifugation was repeated 3 times, and ultrasonic treatment was performed at 70% power for 25min. Get nanocellulose solution (NCC); 2. Press V (TiCl 4 ):V(NCC)=1:10 will TiCl 4 Slowly drop into the nanocellulose solution, and stir mechanically at 70°C for 4 hours; 3. Add stearic acid dissolved in ethanol (according to adding TiCl 4 Mass 8.2%), distilled water: absolute ethanol: stearic acid=50:6:1.5, stirred at 70°C for 2h,...

Embodiment 3

[0037] A method for preparing a superhydrophobic coating with a nanocellulose template method, comprising the steps of:

[0038] One, take microcrystalline cellulose as raw material sulfuric acid hydrolysis method to prepare nanocellulose solution, specific material dosage ratio is MCC:H 2 SO 4 =1: 9.3g / ml, react in a constant temperature water bath at 40°C for 98min. Add volume ratio to H 2 SO 4 :H 2 O=1:3.2 deionized water terminates the acid hydrolysis reaction. The sample was centrifuged at 6000r / m for 5min, the supernatant was poured off, the centrifugation was repeated 4 times, and ultrasonic treatment was performed at 70% power for 28min. Get nanocellulose solution (NCC); 2. Press V (TiCl 4 ):V(NCC)=1:10 will TiCl 4 Slowly drop into the nanocellulose solution, and stir mechanically at 70°C for 4 hours; 3. Add stearic acid dissolved in ethanol (according to adding TiCl 4 8.2% by mass), distilled water: absolute ethanol: stearic acid = 50: 6.5: 0.7, stirred at 70°...

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Abstract

The invention provides a method for preparing a superhydrophobic coating by a nano-crystalline cellulose template method. Nano TiO2 with controllable particle diameter is generated on the surface of nano-crystalline cellulose in situ, the surface of nano TiO2 is subjected to hydrophobic modification through stearic acid, absolute ethyl alcohol is a solvent, and sodium dodecyl benzene sulfonate is a dispersant. TiO2 and PDMS (polydimethylsiloxane) which are modified by taking nano-crystalline cellulose (NCC) as the template are compounded and co-blended mechanically, and heat treatment is performed to obtain the superhydrophobic coating. The method has the advantages that as stearic acid serves as the modifier, and hydrophobic-CH3 group is introduced, the surface energy of TiO2/NCC is reduced; polydimethylsiloxane and TiO2/NCC are compounded, so that the adhesive force of the coating is improved, a micro/nano coarse structure is formed by interaction between TiO2/NCC and inorganic nano particles, and accordingly, the shortcoming of poor adhesion of TiO2/NCC is made up. The method is simple, the prepared coating can be widely added into various coatings to enhance the hydrophobicity, and the wearing resistance of a coating film can be guaranteed to a certain extent.

Description

technical field [0001] The invention relates to a method for preparing a superhydrophobic coating by using a nanocellulose template method, and belongs to the technical field of coating and modification thereof. Background technique [0002] Compared with traditional organic coatings, water-based coatings are healthier and less polluting. It is in line with the long-term road of green development and has broad application prospects. However, there are shortcomings such as poor water resistance and mechanical properties, and the invention of a new type of superhydrophobic coating can overcome this shortcoming. Patent CN104448960A discloses a kind of stearic acid treatment of TiO 2 / ZnO composite particle obtains the method for superhydrophobic coating, ZnO, TiO 2 , ethanol, sodium dodecylsulfonate and deionized water were evenly mixed, and after magnetic stirring at room temperature for 30 minutes, TiO 2 / ZnO composite particles; then put the stearic acid in anhydrous eth...

Claims

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Application Information

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IPC IPC(8): C09D101/02C09D183/04C09D7/12
Inventor 吴燕于成宁王晓棠惠小雨朱文凯曹坤丽
Owner NANJING FORESTRY UNIV
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