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A kind of water-based polyurethane topcoat with excellent recoating performance and preparation method thereof

A water-based polyurethane, performance technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of high price of silicone leveling agent, high price of polyurethane topcoat, affecting the adhesion between layers, etc., to improve leveling Sex and surface decoration, the effect of reducing the Bernard vortex phenomenon, avoiding the ills of orange peel

Active Publication Date: 2019-11-22
优美特(北京)环境材料科技股份公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the surface of the polyurethane topcoat film whose surface state is adjusted by adding a silicone leveling agent is recoated with a polyurethane topcoat, the silicone leveling agent will gather on the surface of the paint film, which affects the interlayer while reducing the surface tension. Adhesion, decreased recoat performance
In addition, the price of silicone leveling agent is relatively high, and the current market price is often above 200 yuan / kg. Adding silicone leveling agent to each coating also causes the price of polyurethane topcoat to be high

Method used

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  • A kind of water-based polyurethane topcoat with excellent recoating performance and preparation method thereof
  • A kind of water-based polyurethane topcoat with excellent recoating performance and preparation method thereof
  • A kind of water-based polyurethane topcoat with excellent recoating performance and preparation method thereof

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Embodiment 1

[0025] (1) According to the formula in Table 1, prepare the main ingredient through the following steps:

[0026] a. Add raw material 1, at a speed of 500r / min, add raw materials 2-7 in sequence, and stir for 5 minutes;

[0027] b. Increase the rotational speed to 800r / min, add raw material 8 into the solution of step (a), continue to stir for 20min until uniformly dispersed, and then grind until the fineness is ≤10μm;

[0028] c. At 800r / min, add raw materials 9-12 in turn, stir for 20 minutes, filter, and use after standing for 24 hours; the percentage content of RCAS leveling agent is 0%, 0.1%, 0.3%, 0.5%, 0.7 %, 0.9%, 1.1%.

[0029] Table 1 Main agent formula of two-component water-based polyurethane topcoat

[0030]

[0031] (2) According to the formula in Table 2, prepare a curing agent: at a speed of 800r / min, add raw materials 1 and 2 in Table 2, stir until uniformly dispersed, and obtain a curing agent.

[0032] Table 2 Two-component water-based polyurethane top...

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Abstract

The invention belongs to the technical field of paint preparation and particularly relates to waterborne polyurethane finish paint with excellent recoating performance and a preparation method. The waterborne polyurethane finish paint is mainly prepared from organic bentonite, a defoaming agent, a dispersing agent, a PH regulator, an alcohol-ether solvent, rutile titanium dioxide, hydroxyl resin,an RCAS leveling agent and a thickening agent, and a curing agent is prepared from an alcohol-ether cosolvent and isocyanate prepolymers; the raw materials are mixed in sequence and dispersed uniformly, and PH of a host is regulated to 8.5-9.5 by the PH regulator. When the waterborne polyurethane finish paint is applied to multiple coating, all that is required is to add the RCAS leveling agent tocoated first finish paint, no leveling agents are added to the second finish paint or the third or more finish paint, leveling property of multiple coatings can be improved simultaneously without affecting adhesion force among finish paint layers, and the recoating performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, in particular to a water-based polyurethane topcoat with excellent recoating performance and a preparation method. Background technique [0002] Polyurethane coatings have become one of the most important decorative finishes due to their advantages such as good fullness, good weather resistance, and high gloss. However, the volatilization of the solvent in the paint on the surface of the paint film will cause differences in temperature, surface tension, solvent concentration and density in the paint film. In order to balance this thermodynamic imbalance, flows appear in the paint film. A vortex is formed in the membrane, namely a Bernard vortex. Surface tension is higher at the edges of the vortex than at the center, and paint flows from areas of low surface tension to areas of high surface tension. This creates an imbalance in the paint film during the drying process, resulting in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D7/47C09D7/61C09D7/65
CPCC08K2003/2241C08L2205/025C08L2205/035C09D175/04C08L75/04C08L83/12C08L83/04C08K3/22C08K3/346
Inventor 张建森王瑞涛姜兆华张小宸
Owner 优美特(北京)环境材料科技股份公司
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