Polyurethane coating as well as preparation method and application thereof

A polyurethane coating and isocyanate technology, applied in the direction of polyurea/polyurethane coating, coating, etc., can solve the problems of affecting the flatness of the coating film, difficult coating filling, low density, etc., to achieve good anti-slump performance, shorten production cycle, Simple preparation method

Pending Publication Date: 2022-05-10
ZHONGSHAN DOIT PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, based on the special structure of African wood, it is more difficult to fill the coating, which is a difficult problem for existing polyurethane coatings
[0006] For the finishing process of African wood mentioned above, if scraping is used, better filling performance can be obtained, but the transparency will be affected. If powder-free polyurethane coating is used, the transparency will be good, but the filling performance will be poor, and multiple sprayings are required, affecting the transparency. The environment and benefits, and African wood has deep wood grain and low density, and it is easy to generate air bubbles during spraying, which affects the flatness of the coating film
[0007] In recent years, this kind of furniture using African wood as the base material has become popular in the market to highlight the effect of wood texture. However, the use of existing coatings and techniques for the construction of African wood is prone to problems such as high oil absorption, foaming, and later shrinkage and collapse. It is difficult to balance the transparency, filling and collapse resistance of the coating film

Method used

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  • Polyurethane coating as well as preparation method and application thereof
  • Polyurethane coating as well as preparation method and application thereof
  • Polyurethane coating as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] In Example 1, component A of polyurethane coating uses high hydroxyl number alkyd resin with A3, and in Comparative Examples 1-2, high hydroxyl number alkyd resin with A1-A2 is used. The high hydroxyl number alkyd resin with A1-A3 is prepared according to the formula in Table 1:

[0082] Table 1 Formula of alkyd resin with high hydroxyl value (unit: parts by weight)

[0083] Number of alkyd resin with high hydroxyl value A1 A2 A3 phthalic anhydride 18.2 35.5 M-phthalic anhydride 36.6 20.3 neopentyl glycol 12.5 22 21.2 trimethylolpropane 13.7 20 pentaerythritol 10 15.2 Lithium hydroxide 0.1 0.1 0.1 butyl acetate 20.3 19 15.3 Reflux solvent 7.8 5.2 7.9 solid content 72％ 75％ 78％

[0084] Add polyanhydride, polyol and reflux solvent in turn according to the formula in Table 1, and introduce N. 2 Heating the gas to 130℃, adding lithium hydroxide, heating to 170℃ for reflux esterification for 2.5h,...

Embodiment 1 and comparative example 1-5

[0097] 1, preparing component A.

[0098] The difference between Example 1 and Comparative Examples 1-5 is that component A is different. Example 1 and Comparative Examples 1-5 respectively use the following raw materials in Table 3 and their proportions to prepare component A.

[0099] Table 3 Mass Ratio of Formula A in Examples 1-3 (unit: parts by weight)

[0100]

[0101]

[0102] According to Table 3, the alkyd resin with high hydroxyl value, filler powder, additives and butyl acetate prepared above are dispersed at a high speed of 1500r / min for 20 minutes until the fineness is less than 50μm, thus obtaining component A.

[0103] 2. Preparation of component B.

[0104] The raw materials of component B include:

[0105]

[0106] Add TDI-TMP polymer and TDI trimer into ethyl acetate diluent, mix well, and dilute with butyl acetate diluent to prepare component B, in which the solid content of component B is 45%, the viscosity is 13.2S (coated -4 cups), and the NCO value of ...

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Abstract

The invention belongs to the technical field of polyurethane coatings, and provides a polyurethane coating and a preparation method and application thereof.The polyurethane coating comprises a component A and a component B. The component A comprises high-hydroxyl-value alkyd resin and filling powder, the filling powder contains polyethylene micronized wax powder, and the component B comprises an isocyanate curing agent. After the polyurethane coating is formed into a film, the film has good transparency, is odorless, basically does not collapse within two weeks, has the drying time of not more than 5.2 hours and has a granular hand feeling; the polyurethane coating provided by the invention can be applied to coating of the African wood, the utilization rate of the African wood is greatly improved, and meanwhile, the requirements of most medium consumers on quality and the pursuit of high-grade solid wood effects are met.

Description

Technical field [0001] The invention relates to the technical field of polyurethane coating, in particular to a polyurethane coating and a preparation method and application thereof. technical background [0002] Solid wood furniture is the oldest and traditional furniture form in China. Paint has been used for thousands of years in China. As early as the Han Dynasty, lacquer has been applied to the exterior finishing of wooden furniture, which plays a role in protecting wood, beautifying the exterior and showing the grain of solid wood. Modern wood furniture uses coatings, referred to as wood paint for short, which not only meets the needs of general maintenance of furniture, but also has many effects, textures and colors, providing people with more personalized choices. [0003] At present, solid wood furniture is developing from practical to new, high-end and expensive. Antique furniture replaced by solid wood and new Chinese furniture are the current market darlings. A lot of...

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D7/65
CPCC09D175/06C09D7/65C08L2201/10C08L23/06
Inventor 沈金星张海星朱永钱
Owner ZHONGSHAN DOIT PAINT CO LTD
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