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Preparation method of titanate-modified nano cerium oxide/polyurethane composite paint
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A technology of nano-cerium oxide and composite coatings, applied in the field of coatings, to achieve good corrosion resistance and aging resistance, good storage stability, and not easy to settle
Active Publication Date: 2014-02-19
STATE GRID CORP OF CHINA +2
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However, nano cerium oxide particles are small, have great surface energy and high surface activity, and are prone to agglomeration when mixed into polymers. At the same time, it has hydroxyl groups with strong hydrophilicity on the surface, which is hydrophilic and oleophobic, and is dispersed in polymers. Inhomogeneity, leading to interface defects and degradation of material properties, so the direct application effect is not good
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Embodiment 1
[0055] (1.1) Prepare raw materials according to the weight of the following components:
[0059] (1.2) First put 10kg of nano-cerium oxide powder into the high-speed disperser, then dilute it with 89.8kg of mixed solvent (water:ethanol=1:9), start the high-speed disperser, stir fully, and measure the pH value of the solution. The speed of the high-speed disperser is set at 600-1000 rpm, and the dispersion time is 20 minutes;
[0060] (1.3) Pour the mixture in step (1.2) into a three-necked flask, add 0.2kg of NDZ-102 titanate coupling agent, raise the temperature to 85°C, mix, stir and reflux for 5 hours, and test its pH value;
[0061] (1.4) Wash the pH value of the mixture prepared in step (1.3) with deionized water until it is consistent with the pH value of the mixture in step (1.2), filter the nanopowder, and wash the obtained powder wi...
Embodiment 2
[0092] (2.1) Prepare component 1. According to the weight percentage, component 1 includes the content of the following components: NDZ-102 titanate coupling agent modified nano-cerium oxide powder 2%;
[0093] Hydroxy acrylic resin 60%;
[0094] Auxiliary 5%;
[0095] Solvent 33%;
[0096] First mix NDZ-102 titanate coupling agent modified nano-cerium oxide powder, hydroxyacrylic resin, additives and solvent in a ratio of 2:60:5:33, then put it into a high-speed ball mill to achieve uniform mixing, start high-speed A ball mill. The speed of the high-speed ball mill is set at 200 rpm, and the ball milling time is 4 to 6 hours. After high-speed dispersion, component 1 of the NDZ-102 titanate coupling agent modified nano cerium oxide / polyurethane composite coating is obtained.
[0097] (2.2) Prepare component 2. According to weight percentage, component 2 includes the content of the following components:
[0098] Solvent 0~75%;
[0099] Curing agent 25~100%;
[0100] Add th...
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Abstract
The invention discloses a preparation method of a titanate-modified nano cerium oxide / polyurethane composite paint. According to the preparation method, nano cerium oxide is modified by utilizing a titanate coupling agent so as to prepare titanate-modified nano cerium oxide powder, and the titanate-modified nano cerium oxide / polyurethane composite paint is prepared by utilizing the titanate-modified nano cerium oxide powder. The preparation method comprises the following steps: (1), preparing the titanate-modified nano cerium oxide powder, wherein the nano cerium oxide powder and a mixed solvent are mixed in proportion and the titanate coupling agent is added to obtain the titanate-modified nano cerium oxide powder; (2), preparing the titanate-modified nano cerium oxide / polyurethane composite paint. According to the invention, the nano cerium oxide powder is changed to oleophilic hydrophobicity after modification from hydrophilic lipophobicity before modification, so that the stability and dispersibility of the titanate-modified nano cerium oxide powder are improved in polyurethane resin. And the corrosion resistance and ageing resistance of a titanate-modified nano cerium oxide / polyurethane composite coating obtained by adopting the preparation method disclosed by the invention are improved.
Description
technical field [0001] The invention relates to a preparation method of a titanate-modified nano cerium oxide / polyurethane composite coating, which belongs to the technical field of coatings. Background technique [0002] Polyurethane, also known as polyurethane, is a polymer compound formed by the reaction of dibasic or polyisocyanate and dibasic or polyhydroxy compound. The terminal group is a strong polar group isocyanate (containing -NCO group). Therefore, It exhibits many unique advantages: wear resistance, adhesion, low temperature resistance, thermal shock resistance, peel resistance, atmospheric resistance, etc. In the field of coatings, isocyanate can also combine with hydroxyl groups in the substrate to form strong chemical bonds and hydrogen bonds, which enhances the adhesion to the substrate, which makes it combine the advantages of coatings and is currently the fastest growing One of the types of coatings. [0003] Nano-cerium dioxide has the advantages of si...
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