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Scratch-resistant and weather-resistant polyurethane (PU) bright black finishing coat

A scratch-resistant and weather-resistant polyurethane technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as loss of gloss, poor hardness, and discoloration, and achieve the effects of overcoming poor hardness, high flexibility, and high scratch resistance

Active Publication Date: 2014-04-09
上海巴德士化工新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current polyurethane bright black topcoat usually uses short-oil alkyd resin, ordinary carbon black and other materials, and the main agent is prepared by high-speed dispersion method. Under the baking environment, the paint film is formed by cross-linking. Because of the poor hardness of materials such as short-oil alkyd resin, ordinary carbon black, and ordinary TDI-TMP adducts, the furniture is easy to be scratched due to scratches during use. There are traces on the surface of the film. At the same time, due to the poor weather resistance of the materials used, it is easy to cause loss of light, discoloration, and darkening, which reduces the beautification and decoration effect of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A component

[0043] .

[0044] The preparation process of the A component is as follows: in a clean and standard container, add 20 kg of 10% 6# carbon black flour paste, 55 kg of acrylic resin, 15 kg of 60% aldehyde and ketone resin solution, 2 kg of xylene, Start the disperser, disperse evenly under medium speed stirring at 800~1000 r / min, add defoamer BYK-141 0.3 kg, leveling agent EFKA-3777 0.3 kg, leveling agent BYK-333 0.1 kg, propylene glycol methyl ether Acetate 4 kg, n-butyl acetate 3.3 kg, stirring and dispersing at a medium speed of 800-1000 r / min for 10-15 min, the viscosity is 3500 mpa.s / 25 ℃.

[0045] B component

[0046] .

[0047]The preparation process of the B component is as follows: in a clean container, sequentially add 26 kg of dehydrated n-butyl acetate and 5 kg of dehydrated xylene, start the disperser, and stir evenly at a medium speed of 500-800 r / min , add TDI adduct curing agent Desmodur L-75 44 kg, TDI trimer curing agent Desmodur IL...

Embodiment 2

[0053] The raw materials were prepared as listed in Table 1, and the three components A, B, and C were prepared respectively by the same preparation method as in Example 1.

[0054] How to use: When in use, mix the three components A, B, and C evenly in a weight ratio of 1:1:0.8, and use spraying, brushing, and showering methods for construction. Among them, component C does not participate in chemical reactions, only It plays the role of thinning construction.

[0055] Table 1:

[0056] .

Embodiment 3

[0058] The raw materials were prepared as listed in Table 2, and the three components A, B, and C were prepared respectively by the same preparation method as in Example 1.

[0059] How to use: When in use, mix the three components A, B, and C evenly at a weight ratio of 1:0.8:0.8, and use spraying, brushing, and showering methods for construction. Among them, component C does not participate in chemical reactions. It plays the role of thinning construction.

[0060] Table 2:

[0061] .

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PUM

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Abstract

The invention relates to a scratch-resistant and weather-resistant polyurethane (PU) bright black finishing coat, which is mainly prepared from three components A, B and C according to the weight ratio 1:(0.8-1):(0.6-0.8) in a mixing manner. Aiming at the technical defects that the product in the prior art is poor in hardness, poor in scratch resistance and poor in weather fastness in the application process, the materials with excellent weatherability, such as acrylic resin and 6# carbon material are adopted to react with a toluene diisocyanate (TDI) trimer curing agent with high hardness, high flexibility and high scratch resistance, so that the product has the characteristics of being high in weatherability, high in hardness, high in flexibility, high in scratch resistance and the like. Thus, the defects of poor hardness and poor scratch resistance easily generated in the product, and fading, discoloring, shading and the like of a film along with time lapse are overcome.

Description

technical field [0001] The invention relates to a scratch-resistant and weather-resistant polyurethane PU bright black finish, which belongs to the wood coating industry. Background technique [0002] In the decoration and protection of materials, polyurethane glossy black finish presents a mirror-like decorative effect with full paint film and smooth surface. It is widely used in the coating of high-end furniture and is deeply loved by people. The decorative protection effect of polyurethane glossy black finish mainly depends on the covering power, fullness, gloss and hardness of the product film, and at the same time, it also needs to take into account adhesion, flexibility, weather resistance, abrasion resistance, chemical resistance, and protection. The consideration of comprehensive properties such as light color retention. [0003] The current polyurethane bright black topcoat usually uses short-oil alkyd resin, ordinary carbon black and other materials, and the main ...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D7/12
Inventor 方学平赖晓宗刘欢
Owner 上海巴德士化工新材料有限公司
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