Preparation of super-hydrophobic coating with nanocrystalline cellulose/silicon dioxide composite template process

A super-hydrophobic coating and nanocrystal technology, applied in the direction of coating, can solve the problems of poor water resistance and mechanical properties, and achieve the effect of ensuring the wear resistance of the coating film, wide source, and enhancing the hydrophobic performance.

Active Publication Date: 2016-06-15
广东新红阳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention proposes a method for preparing a superhydrophobic coating with a cellulose nanocrystal / silicon dioxide composite template method. Sulfuric acid hydrolysis of cellulose nanocrystals, uniform mixing of toluene solution and cellulose nanocrystals-ethanol solution to obtain a silica solution, hydrophobic modification of the silica surface by stearic acid, and stearic acid-modified cellulose nanocrystal / silica composite

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] The method for preparing superhydrophobic coating with cellulose nanocrystal / silicon dioxide compound, comprises the steps:

[0029] One, take microcrystalline cellulose as raw material sulfuric acid hydrolysis method to prepare cellulose nano crystal solution, concrete material dosage ratio is MCC:H 2 SO 4 =1: 8.5g / ml, react in a constant temperature water bath at 40°C for 50min until completely hydrolyzed. 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 80% power for 2h. Obtain cellulose nanocrystal solution (NCC); Two, dialysis removes H on the surface of cellulose + and SO 2 4 - , then the mass concentration of 95% ethanol is mixed into the cellulose nanocrystal suspension, and under the condition of 100MPa, the 95% ethanol containing the acid-treated cellulose nanocrystal is passed through a high-pressure homogenizer 3 times to obtain the cellulos...

Embodiment 2

[0032] The method for preparing superhydrophobic coating with cellulose nanocrystal / silicon dioxide compound, comprises the steps:

[0033] One, take microcrystalline cellulose as raw material sulfuric acid hydrolysis method to prepare cellulose nano crystal solution, concrete material dosage ratio is MCC:H 2 SO 4 =1: 8.8g / ml, react in a constant temperature water bath at 40°C for 60min until completely hydrolyzed. 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 80% power for 2.5h. Obtain cellulose nanocrystal solution (NCC); Two, dialysis removes H on the surface of cellulose + and SO 2 4 - , then the mass concentration of 95% ethanol is mixed into the cellulose nanocrystal suspension, and under the condition of 100MPa, the 95% ethanol containing the cellulose nanocrystal after the acid treatment is passed through a high-pressure homogenizer 3 times to obtai...

Embodiment 3

[0036] The method for preparing superhydrophobic coating with cellulose nanocrystal / silicon dioxide compound, comprises the steps:

[0037] One, take microcrystalline cellulose as raw material sulfuric acid hydrolysis method to prepare cellulose nano crystal solution, concrete material dosage ratio is MCC:H 2 SO 4 =1: 9.1g / ml, react in a constant temperature water bath at 40°C for 70min until completely hydrolyzed. 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 80% power for 3h. Obtain cellulose nanocrystal solution (NCC); Two, dialysis removes H on the surface of cellulose + and SO 2 4 - , then the mass concentration of 95% ethanol is mixed into the cellulose nanocrystal suspension, and under the condition of 100MPa, the 95% ethanol containing the cellulose nanocrystal after the acid treatment is passed through a high-pressure homogenizer 3 times to obtain ...

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Abstract

The invention discloses a method for preparing a super-hydrophobic coating with a nanocrystalline cellulose/silicon dioxide (NCC/SiO2) composite template process. The method comprises the following steps: (1) treating microcrystalline cellulose (MCC) with 56% sulfuric acid; (2) performing centrifugal washing; (3) replacing water in an NCC suspension solution with ethanol; (4) grinding for later use; and (5) freezing a sample to subzero 30 DEG C and performing vacuum freeze-drying. The method has the advantages that stearic acid is taken as a modifier and can produce a dehydration reaction with surface -OH of SiO2/NCC, and stearic acid further introduces hydrophobic -CH3 groups, so that the surface energy of SiO2/NCC is reduced; and an NCC and SiO2 compound has not only the properties of a biopolymer material but also the properties of an inorganic material such as weather resistance, hardness and the like, can be used for modifying indoor and outdoor coatings, and can play a role in aspects of building floor cleaning, furniture pollution prevention and the like.

Description

technical field [0001] The invention relates to a method for preparing a superhydrophobic coating by using a composite template method of cellulose nanocrystals and silicon dioxide, and belongs to the technical field of coating and modification thereof. Background technique [0002] Compared with traditional organic coatings, water-based coatings are healthy and low-pollution, and cellulose nanocrystals come from a wide range of sources, have super strength and flexibility, and are biodegradable. They are in line with the current green development trend and have broad potential. Application prospect. At present, there are superhydrophobic preparation methods using organosilicon or silicon dioxide as templates. For example, HulyaBudunoglu et al. used methyltriethoxysilane as raw material at room temperature, and through hydrolysis, polycondensation, aging and other processes, prepared contact angle The superhydrophobic silicone airgel film with a temperature of 179.9°, good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D101/00C09D7/12C08B15/02
CPCC08B15/02C08K3/36C08K9/04C09D7/62C09D101/00
Inventor 吴燕惠小雨王晓棠廖晓梅王玲赵雅莹
Owner 广东新红阳科技有限公司
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