Preparation method for easily-cleaned hydrophobic membrane used on surface of automotive body
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A technology of automobile body and hydrophobic film layer, which is applied in the field of preparation of easy-to-clean hydrophobic film layer, which can solve the problems of easy damage and insufficient bonding force, and achieve the effects of reducing damage, improving bonding force, and improving durability
Active Publication Date: 2013-12-11
CHERY AUTOMOBILE CO LTD
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[0004] The present invention designs a method for preparing an easy-to-clean hydrophobic film layer on the surface of an automobile body. The technical problem it solves is that the current easy-to-clean hydrophobic film layer has insufficient binding force on the paint surface and is easily damaged
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Embodiment 1
[0020] Step 1: Preparation of hydrophobic agent
[0021] Add 3 parts of heptadecafluoroalkyltrimethoxysilane, 1 part of hydrochloric acid (37% by mass) and 2 parts of deionized water into 94 parts of ethanol, and stir at 80°C for 30 minutes to obtain solution A;
[0022] Add 2 parts of 3-aminopropyltriethoxysilane, 10 parts of vinyltriethoxysilane and 1 part of acetic acid into 87 parts of ethanol, stir at room temperature for 50 minutes, and obtain solution B.
[0023] Step 2: Preparation of hydrophobic film layer
[0024] First, clean the surface of the varnish layer with ethanol to remove dust and pollutants on the surface, and keep the surface dry. Then mix solution A and solution B evenly according to the ratio of 1:1, then wipe the mixed solution on the surface of the body paint, and finally dry it at room temperature for 4 hours.
Embodiment 2
[0026] Step 1: Preparation of hydrophobic agent
[0027] Add 5 parts of octadecyltrimethyloxysilane, 2 parts of nitric acid (10% by mass) and 3 parts of deionized water into 90 parts of ethyl acetate, and stir at 50°C for 70 minutes to obtain solution A;
[0028] Add 1 part of γ-(2,3 glycidoxy)propyltrimethoxysilane, 5 parts of γ-chloropropyltriethoxysilane and 1 part of hydrochloric acid (mass fraction 37%) to 93 parts of ethyl acetate , and stirred at room temperature for 20 min to obtain solution B.
[0029] Step 2: Preparation of hydrophobic film layer
[0030] First, clean the surface of the varnish layer with ethanol to remove dust and pollutants on the surface, and keep the surface dry. Then mix solution A2 and solution B2 evenly according to the ratio of 2:1, then wipe the mixed solution on the surface of the body paint, and finally dry it at room temperature for 24 hours.
[0031] Initial contact angle test method: test environment (23±2) ℃, RH (50±5)%, the test me...
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Abstract
The invention relates to a preparation method for an easily-cleaned hydrophobic membrane used on the surface of an automotive body. A hydrophobing agent is prepared, by weight, by the following steps: adding 1-5 parts of low surface energy matter, 0.1-2 parts of catalyst and 0.5-5 parts of deionized water in 70-95 parts of organic solvent, conducting backflow stirring for 30min-150min at the temperature of 40-100 DEG C, obtaining a mixed solution A, adding 0.5-5 parts of first coupling reagent, 1-10 parts of second coupling reagent and 0.1-2 parts of catalyst in 70-95 parts of organic solvent, stirring for 20-100min at the indoor temperature, obtaining a mixed solution B, using the organic solvent to wash the surface of a varnish layer on the surface of the automotive body, keeping the surface dry, then evenly mixing the mixed solution A with the mixed solution B according to the mass proportion of 1-2:1, coating the varnish layer of the automotive body with a mixed solution of the mixed solution A and the mixed solution B, and stewing for 4-72 hours at the normal temperature. According to the preparation method, the coupling reagents are added in the hydrophobic membrane layer, a coupling reagent middle layer can be additionally arranged between the hydrophobic membrane layer and the coating surface, the binding force of the hydrophobic membrane layer and the coating is improved, and the durability of the hydrophobic membrane layer is improved.
Description
technical field [0001] The invention relates to a material surface treatment method, in particular to a preparation method for an easy-to-clean hydrophobic film layer used on the surface of an automobile body. Background technique [0002] Automotive coatings can not only protect the body and avoid metal corrosion of the body, but also an important symbol of the aesthetics of the car. The glossiness of body paint is an important indicator for many consumers to choose a car. In order to maintain the surface gloss and cleanliness of the car paint, the car needs to be cleaned and maintained regularly. As the number of cleanings increases, the glossiness of the body paint surface will gradually decrease, and cleaning will bring a lot of sewage, many of which are difficult to decompose chemical reagents, which will cause lasting pollution to the water body. [0003] The current easy-to-clean hydrophobic film is mainly used on glass substrates, and there are few studies on easy-t...
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