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Preparation method of enamel surface coatings with hydrophobic effect
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A technology of surface coating and enamel, which is applied in the field of preparation of enamel surface coating, to achieve strong hydrophobic effect, long effective time of hydrophobicity, excellent chemical stability and protective effect
Inactive Publication Date: 2011-04-27
DONGHUA UNIV
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Problems solved by technology
So far, there is no report about using the sol-gel process to coat the modified silica sol on the enamel plate to prepare the enamel coating with hydrophobic effect.
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Embodiment 1
[0026] (1) Wash the ordinary enamel plate with deionized water for 30 minutes, and place it in an oven at 80°C to dry;
[0027] (2) Preparation of the sol, Si(OC 2 h 5 ) 4 , C 2 h 5 OH, H 2 O, HCl, and DMF were mixed, stirred with a magnetic stirrer at room temperature for 1 hour, and then slowly added dimethylchlorosilane (DMCS) prepared to modify the surface of the sol. The volume fraction of DMCS was controlled to be 2.5%, and the pH value was 1.5;
[0028] (3) The sol formed after hydrolysis is aged at room temperature for 9 days, and before complete gelation, the solution viscosity reaches the optimum film coating time;
[0029] (4) Using the dip coating method, the enamel substrate in step (1) is immersed in the sol, and after one minute, it is pulled vertically at a speed of 0.5cm / s, so that the DMCS-modified silica colloidal solution is evenly coated Cover the surface of the enamel substrate, then keep it warm at 60°C for 20 hours, and cool slowly to make an ena...
Embodiment 2
[0032] (1) Wash the ordinary enamel plate with deionized water for 30 minutes, and place it in an oven at 80°C to dry;
[0033] (2) Preparation of sol, the Si(OC with a molar ratio of 2:4:4:0.3:2 2 h 5 ) 4 , C 2 h 5 OH, H 2 O, HCl, and DMF were mixed, and after stirring with a magnetic stirrer at room temperature for 1 hour, slowly added trimethylchlorosilane (TMCS) prepared to modify the surface of the sol, controlling the volume fraction of DMCS to be 5%, and the pH value to be 3;
[0034] (3) The sol formed after hydrolysis is aged at room temperature for 10 days, and before complete gelation, the solution viscosity reaches the optimum film coating time;
[0035] (4) Dip the enamel substrate in step (1) into the sol by dipping, and pull it vertically at a speed of 0.5cm / s after one minute, so that the TMCS-modified silica colloidal solution is evenly coated Cover the surface of the enamel substrate, then keep it warm at 80°C for 10 hours, and cool slowly to make an e...
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Abstract
The invention relates to a method for preparing an enamel surface coating with hydrophobic effect. The method includes the following steps of: (1) cleaning an enamel substrate by using deionized water and drying the enamel substrate in a drier; (2) preparing sol by mixing Si(OC2H5)4, C2H5OH, H2O, HCl and DMF with the mol ratio of 1 to 2.5:2 to 5:3 to 8:0.1 to 0.4:1 to 4, stirring the mixture for 1-2h at the room temperature, and adding a hydrophobing agent to obtain the pH value ranging from 1 to 4; (3) seasoning the sol at the room temperature for 8-12 days; and (4) adopting a dip coating method to dip the enamel substrate in the step (1) in the sol and to vertically lift and pull the enamel substrate, and keeping the temperature of the enamel substrate at the temperature ranging from 60 DEG C to 200 DEG C for 5-20h, and obtaining the enamel surface coating after cooling. The material of the enamel surface coating with the hydrophobic effect has high combination strength, the contact angle can reach 140 degrees, the hydrophobic effect is good and can be kept for long time, the preparation method is simply and conveniently operated, and the production cost is low.
Description
technical field [0001] The invention belongs to the field of preparation of enamel surface coatings, in particular to a preparation method of enamel surface coatings with hydrophobic effect. Background technique [0002] Steel plate enamel has been widely used in the interior and exterior decoration of buildings, subway stations, underground tunnels, enamel water heaters and enamel containers, etc. Enamel with hydrophobic effect can not only protect and decorate, but also because of its excellent The hydrophobic effect can also play a cleaning role. Especially for the enamel used on the floor, the hydrophobic effect can make the water accumulated on the floor remove dust and harmful substances in time, which is conducive to environmental cleaning and environmental protection. [0003] The hydrophobicity of the coating is directly related to the surface roughness of the coating and the chemical properties of the coating itself. At present, the research on hydrophobic materi...
Claims
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