A modified polyurea coating

A polyurea and coating technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of nanoparticle dispersion, unreached lifting range, dispersion, etc.

Active Publication Date: 2021-04-02
浙江中科应化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The mechanical properties of polyurea coating materials can be improved to a certain extent by doping nano-powder materials, but there is still a key problem in the current nano-modification, that is, the aggregation of nanoparticles themselves and the dispersion in the matrix.
The ultra-small volume and large specific surface area of ​​nanoparticles are the key to improving the performance of matrix materials, but it is also based on this feature that nanoparticles cannot be dispersed in nanometers in the matrix
Therefore, although the current nanoparticle filling modification of polyurea coating can improve the performance of the material to a certain extent, the improvement is far from the upper limit of the nano-modification technology, because the dispersion

Method used

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  • A modified polyurea coating
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  • A modified polyurea coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 1g of nano-silica particles, add them to 50ml of oxalic acid aqueous solution with a mass concentration of 20%, and heat and stir in a water bath at 60°C for 6 hours; after standing to precipitate, silica nanoparticles rich in hydroxyl groups on the surface are obtained. Wash it repeatedly with saturated sodium bicarbonate solution to neutrality, then add 50ml of methoxydimethylbutylaminosilane acetone solution with a concentration of 0.02g / ml, stir for 1h, and then add dropwise 0.02g of Dibutyltin laurate, react at room temperature for 2 hours, and distill off acetone under reduced pressure to obtain silane-modified silica nanoparticles with amino groups.

[0044] From the results of infrared analysis, it can be seen that 1648, 3450cm -1 The location appeared - NH 2 Vibration peak, 470cm -1 Si-O vibration peaks appear at the position, 800, 1260cm -1 position appears -Si(CH 3 ) 2 - Vibration peaks.

[0045] Through acid-base titration measurement, the surfac...

Embodiment 2

[0049] Weigh 1g of nano-zinc oxide particles, add it to 50ml of 30% hydrofluoric acid aqueous solution, heat and stir in a water bath at 60°C for 6 hours; after static precipitation, zinc oxide nanoparticles rich in hydroxyl groups on the surface are obtained. Wash it repeatedly with sodium bicarbonate solution to neutrality, then add 50ml of acetone solution of methoxydimethylhexylaminosilane with a concentration of 0.01g / ml, stir for 1h, and then add dropwise 0.02g of Dibutyltin laurate, react at room temperature for 2 hours, and distill off acetone under reduced pressure to obtain silane-modified nano-zinc oxide particles with amino groups.

[0050] After calculation, the areal density of the nano-zinc oxide particles modified with silane-terminated amino groups obtained in Example 2 is 14 nmol / cm 2 .

[0051] Weighed 0.5 g of silane-modified nano-zinc oxide particles with amino groups and 55 g of isocyanate IPDI (isophorone diisocyanate) and mixed them evenly to obtain a ...

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Abstract

The invention provides a modified polyurea coating. The modified polyurea coating contains a component A and a component B, wherein the component A is an amine-terminated silane-modified spherical nano-particle; and the component B is a diisocyanate compound. Compared with the prior art, the amine-terminated silane-modified spherical nano-particle is taken as the component A, and the liquidation of the nano-particle is realized by controlling the length of a amine-terminated silane grafting chain and the density of a grafted surface, so that the single uniform dispersion of the nano-particlescan be guaranteed when the component A and the component B are mixed, and meanwhile, a coating layer formed after the curing of the modified polyurea coating has ultrahigh strength, hardness and durability.

Description

technical field [0001] The invention belongs to the technical field of polyurea coatings, in particular to a modified polyurea coating. Background technique [0002] Polyurea is developed on the basis of polyurethane, a class of compounds with urea groups (-NH-C(=O)-NH-) in the chemical structure produced by the reaction of amino compounds and isocyanates. Due to the high reactivity of the active hydrogen in the terminal amino group and isocyanate, the reaction rate is fast, so the curing speed of polyurea is significantly faster than that of polyurethane, and its curing process is very little affected by moisture. Walking solidification can be achieved in the middle, and it is almost not affected by the surrounding environment. In addition, polyurea materials also have good mechanical, anti-corrosion and heat-resistant properties. When used as a coating, polyurea materials have good performance both in the construction process and in the use process, and have been widely ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/02C09D7/62
Inventor 邓鹏飏柳美华尹园郑春柏魏巍张依帆
Owner 浙江中科应化科技有限公司
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