JPH0347111Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a wooden door in which the surface of a door base material made of heat-treated wood is coated with a urethane resin paint and a fluorine resin paint.

Structure of conventional examples and their problems Wooden doors have traditionally been used as entrance doors and interior doors, but wooden entrance doors in particular tend to warp, deform, and break joints due to the movement of the wood over time. Lack of aesthetic appeal due to deterioration of the paint became a problem, and there were virtually no entrance doors that could withstand long-term use.

Purpose of the invention The purpose of the invention is to provide a wooden door that solves these problems and whose surface is finished with a paint that has excellent durability and weather resistance and has less warping.

Design structure: This was devised to achieve the above purpose. Urethane resin paint is coated on the surface of the door base material made of heat-treated wood, and then a cold-curing urethane cross-linked fluororesin paint is overcoated. This relates to painted wooden doors.

DESCRIPTION OF EMBODIMENTS The present invention will be described below based on the drawings of one embodiment.

Figure 1 shows a door base material 1 made of heat-treated wood, which has been subjected to sealing treatment as necessary.
It is a cross-sectional view of a wooden door member 4 which has been coated with a known urethane resin paint 2 as an undercoat or intermediate coat, and then finished with a top coat of a cold-curable urethane crosslinked fluorine resin paint 3.

The heat-treated wood according to the present invention is wood that has been heat-treated in a dryer, pressure vessel, liquid tank, etc. using a heat medium such as air, steam, nonflammable gas, or oil. The method of heating with steam or oil is preferable from the viewpoint of ease of handling and cost, but heating is recommended at temperatures between 120℃ and 250℃.
The wood is treated at a temperature range of 30°F and processed into the targeted heat-treated wood.

Such heat treatment modifies the interior of the wood, improving its dimensional stability and processing it into treated wood with a low equilibrium moisture content. At the same time, this treated wood has an anti-expansion rate (value obtained by dividing the difference in expansion rate between untreated wood and treated wood by the expansion rate of untreated wood x 100) of 20% to 50.
%, and physical properties equivalent to or higher than those of known polyethylene glycol-treated wood and acetylated wood are obtained. The reason for this improvement in quality is not necessarily clear, but it is thought that heat treatment causes the decomposition of hemicellulose, which also reduces the number of hydroxyl groups in the wood, creating a crosslinked structure within the cellulose. Ru.

Heat-treated wood treated in this way can be used for example at a temperature of 40°C, a humidity of 40% and a temperature of untreated rubber wood.
The tangential expansion coefficient at 40℃ and 65% humidity is around 1% and 1.5 to 2.5%, respectively, while 0.5
% and has decreased to 1.0-1.4%. At the same time, the equilibrium moisture content is at a temperature of 40°C and a humidity of
At 40% and 65%, it was 6% and 9%, respectively, whereas in the treated material, it improved to 3.5% and 5.5%. If such heat-treated wood is used as a door base material, benefits such as less dimensional change and less warping due to moisture absorption can be enjoyed.

The urethane resin paint applied to the door base material is used for the purpose of ensuring coating properties and being able to follow the movement of the door base material to some extent.

The coating film is finished in a thickness of 100 to 300 microns by applying the two-step process of undercoating and intermediate coating, as well as by applying it multiple times.

Room-temperature-curing urethane crosslinked fluororesin paints for topcoat finishes have a content of fluoroolefin, cyclohexyl vinyl ether, alkyl vinyl ether, hydroxyalkyl vinyl ether, and other copolymerized units of 40 to 60 mol%, respectively. , 5 to 45 mol%, 5 to 45 mol%, 3 to 15 mol% and 0 to 30 mol%, with an intrinsic viscosity of 0.1 to 2.0 dl/g measured in uncured state in tetrahydrofuran at 30°C. It consists of a main component obtained by dissolving a certain composition in an organic solvent, and a curing agent component of polyvalent isocyanates consisting of non-yellowing diisocyanates such as hexamethylene diisocyanate and isophorone diisocyanate, and adducts thereof. It is a two-component paint made by adding known curing accelerating catalysts such as dibutyltin dilaurate, pigments, dispersion stabilizers, viscosity modifiers, leveling agents, anti-gelling agents, ultraviolet absorbers, etc. as necessary. , spray, roll, etc., to reduce the coating thickness.
It is a paint that provides a coating film with good physical properties when applied over 20μ, and a specific example is the product name ``Lumiflon'' manufactured by Asahi Glass Co., Ltd.

Effects of the invention When comparing the durability of this invention in an outdoor exposure test, we found that the undercoat, intermediate coat, and topcoat were all urethane resin paints, and wooden doors made of untreated wood had no paint film.
0.2 years, warping 0.2 years, paint peeling 1 year, mat loss (5%)
However, the wooden door of this invention using heat-treated wood with a urethane resin paint of 100 to 120μ for the undercoat and intermediate coat and a urethane cross-linked fluororesin paint for the top coat As can be seen from the results that the durability of outdoor exposure tests are all over 3 years after the occurrence of abnormalities, the equilibrium moisture content is low and there is little dimensional change due to the use of heat-treated wood, which prevents dimensional changes due to external conditions. are extremely rare. Therefore, problems such as the coating film being cut and parts being cracked have been solved. What's more, the surface is treated with a urethane resin paint with excellent adhesion and a surface finish with a cold-curing urethane cross-linked fluororesin paint with excellent weather resistance, which has been proven in the outdoor exposure test mentioned above. Useful as a high-quality wooden door for entrances.

[Brief explanation of the drawing]

FIG. 1 shows a structural sectional view showing one embodiment of the wooden door member 4 according to the present invention. 1...Door base material in which heat-treated wood is used,
2...Urethane resin paint, 3...Room temperature curing urethane cross-linked fluororesin paint, 4 ...Wood door member.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A urethane resin paint is applied to the surface of a door base material made of heat-treated wood, and then a cold-curing urethane cross-linked fluororesin paint is applied as a top coat. A wooden door featuring a (2) The temperature of the wooden door base material using heat-treated wood is 40℃ and humidity 40%, and the temperature is 40℃ and humidity 65%.
The wooden door according to claim 1, which has an equilibrium moisture content of 5% or less and 8% or less, respectively.