Transparent treating agent for coating aqueous wooden ware and preparation method thereof

Abstract

The invention relates to the technical field of coatings, in particular to a transparent treating agent for coating an aqueous wooden ware. The transparent treating agent comprises substances of propylene glycol methyl ether, ethanol, nitro-cotton, methyl etherified melamine resin and the like; and the substances are added through different sequences and are matched with different stirring speedsand times to finally prepare the transparent treating agent. The transparent treating agent has the advantages of high wetting property, high drying speed and simple preparation process, is used as asealing primer during coating of the aqueous coating on the wooden ware; and thus, the defect caused by conduit expansion of the wooden ware due to water absorption is avoided, MDF (Medium Density Fiberboard) expansion deformation probably caused by water infiltration is avoided, and an attached thin veneer is difficult to strip off.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a water-based transparent treatment agent for wood coating and a preparation method thereof. Background technique [0002] Volatile organic compounds (VOC) released from coatings, especially aromatic hydrocarbons and formaldehyde, have a serious impact on human health. With the enhancement of environmental awareness, people pay more and more attention to the control of VOC emissions, and many countries have formulated corresponding control standards. Due to the strict control of VOC, the research and development direction of paint has become more and more clear, that is, to seek green paint with continuously reduced VOC until it reaches zero. Green paint refers to the paint that does not cause harm to the ecological environment and does not have a negative impact on human health, also known as "environmentally friendly paint". The development direction of green coatings includ...

AI Technical Summary

Problems solved by technology

[0004] (1) Water-based coatings have high requirements on the cleanliness of the construction process and the surface of the material. Due to the high surface tension of water, dirt is easy to cause shrinkage cavities in the coating film

(2) The dispersion stability of water-based paint against strong mechanical force is poor. When the flow rate in the pipeline changes sharply, the dispersed particles are compressed into solid particles, causing pitting in the coating film; the shape of the pipeline is required to be good, and the pipe wall is free from defects.

(3) Water-based coatings are very corrosive to coating equipment, so anti-corrosion linings or stainless steel materials are required, and the cost of equipment is high; water-based coatings corrode pipelines, dissolve metals, cause dispersed particles to precipitate, and cause pitting on the coating film, which is also Stainless steel pipe is required

(4) Baking-type water-based coatings have strict requirements on the construction environment conditions (temperature, humidity), which increases the investment in temperature and humidity control equipment, and also increases energy consumption

(5) The latent heat of evaporation of water-based coating water is large, and the baking energy consumption is large

Cathodic electrophoretic coatings need to be baked at 180°C; while latex coatings take a long time to dry completely

(6) Organic co-solvents with high boiling points of water-based coatings will produce a lot of oily smoke during baking, and after condensation, they will drip on the surface of the coating film to affect the appearance

(7) The water-based coating has the problem of poor water resistance, which makes the stability of the coating and bath solution poor, and the water resistance of the coating film is poor

[0005] Especially in the water-based paint used for wood, since the water-based paint contains moisture, not only the wood will cause defects due to the expansion of the pipe due to water absorption, but also the direct coating of water-based paint on the medium density fiberboard (MDF) or the thin veneer on the MDF board, Then apply water-based paint, the expansion and deformation of the MDF board will be caused by the penetration of water

The thin veneer on the top is easy to fall off

In addition, due to the high surface tension of water, the wettability of wood to wood is poor, so the volatilization rate of water is slow. When spraying water-based paint in a high-humidity environment, water is not easy to volatilize after penetrating into wood, resulting in slow drying.

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