JP5441346B2 - Paint and painted wood - Google Patents

Description

  The present invention relates to a paint and painted wood, and more particularly to a paint having good drying characteristics using lacquer and a painted wood coated with the paint.

  In wooden buildings such as wooden houses, pillars, beams, flooring, paneling, handrails, counters, doors, furniture, etc. are often painted to protect the wood and improve the beauty. . Most of the paints used today are synthetic paints based on petroleum-based synthetic resins because of their excellent performance and ease of handling. Typical examples of such synthetic resins include lacquer resins, polyurethane resins, acrylic resins, fluororesins, polyester resins, silicone resins, acrylic silicone resins, etc., but these are resource depletion problems and global warming gases. Have environmental problems such as the release of odors.

  In recent years, there has been an increase in the momentum for active use of natural materials due to the growing awareness of environmental protection and safety of familiar substances. An example of utilizing natural materials is the development of a polylactic acid paint using corn starch as the main raw material.

  Lacquer is one of the traditional Japanese natural paints. The lacquer coating film has a plump texture and deep luster, and is excellent in water resistance, heat resistance, and wear resistance, and has been used mainly for painting crafts since ancient times. That is, most of the lacquered products are limited to traditional crafts such as lacquerware, and lacquer is painted on architectural uses such as pillars, beams, flooring, paneling, handrails, counters, doors, etc. This is rarely seen except in some local customs.

  At present, the lacquer industry, one of Japan's most traditional industries, has been devastated by a decrease in the amount of lacquer used, and there is a strong fear that the lacquer industry will not be established. In order to keep the traditional Japanese lacquer industry, it is necessary to make industrial use in fields other than traditional crafts, such as the architectural field.

One factor hindering the use of lacquer for architectural purposes is the low productivity of lacquer. Lacquer is a natural resin with a special drying mechanism that polymerizes and cures (hereinafter, synonymous with drying) by the action of enzymes and requires moisture for drying.
Ordinary lacquer does not dry unless the temperature is 20 to 30 ° C. and the humidity is 70% or more. Therefore, in the past, drying has been performed over many days in a small space called a traditional lacquer room (Muro) with a particularly high humidity. However, in order to expand the use of lacquer in industrial applications such as construction, it is required that the lacquer is dried even in such a special temperature and humidity environment. When considering the use of lacquer for architectural purposes, it is required to ensure dryness even under relatively low humidity conditions.

In addition, lacquer has a property of being easily deteriorated by ultraviolet rays, and in order to improve this property, it is necessary to introduce some ultraviolet resistance improver for improving ultraviolet resistance into the lacquer. At this time, it is not preferable to introduce the ultraviolet resistance improver into the lacquer through a harmful organic solvent that causes sick house syndrome such as toluene or xylene.
For this reason, the UV resistance improver is preferably water-based (aqueous solution or aqueous dispersion).
Moreover, since lacquer is very expensive and is also a resin with high viscosity, it must be assumed that it is diluted with water.
Therefore, the technology for ensuring the drying property of lacquer is required to exhibit its effectiveness (drying property) at a practical level even in the composition of lacquer in which water coexists.

  As a conventional method for improving the drying property of lacquer, a method of adding a silane coupling agent having a specific organic functional group that reacts with lacquer is known (see Patent Documents 1 to 3).

JP 2003-306640 A JP 2003-55558 A JP 2004-331987 A

  The technology of adding the silane coupling agent described above is not only excellent in dryness under low humidity conditions, but also has high safety and low viscosity because no harmful organic solvent is used. Workability at the time of mixing is also high because it is compatible with lacquer. In addition, if the container lid is closed and sealed after mixing, the long-term storage stability is excellent, and the physical properties of the obtained lacquer coating are equivalent to or more than those of conventional lacquer coatings. It was an excellent technology having many advantages such as.

  However, silane coupling agents are relatively expensive and may be disadvantageous in terms of cost in promoting the use of lacquer for architectural applications.

  By the way, in order to use lacquer for architectural purposes, improvement of low UV resistance, which is a drawback of lacquer, is strongly demanded. In order to improve the UV resistance of lacquer, methods of adding UV absorbers and light stabilizers are conceivable. However, these are all concerned with safety and environmental impacts. It is not preferable to add to lacquer.

As a method of improving the UV resistance by a method that hardly affects the human body and the environment, a metal oxide (metal is zinc, titanium, cerium, iron, etc.) of ultrafine particles (average primary particle diameter is about 100 nm or less) is used. The method of highly dispersing in lacquer is mentioned. In this method, since it is technically difficult to disperse ultrafine particles in a highly viscous lacquer, it is reasonable to add a dispersion once in a solvent and mix them. The solvent to be dispersed is preferably water rather than an organic solvent from the viewpoint of influence on human body and environment. In other words, it is preferable to use an aqueous dispersion of ultrafine metal oxide to improve the UV resistance of lacquer.
However, when the silane coupling agent used in Patent Documents 1 to 3 is added to lacquer containing water by mixing an aqueous dispersion of ultrafine metal oxide, the silane coupling agent reacts with lacquer. At the same time, since it reacts with water and hydrolyzes, it has been clarified as a result of the inventor's examination that it is difficult to obtain an effect of improving the drying property in a composition containing water. In other words, it was confirmed that when water is contained in the lacquer, it is difficult to obtain the effect of ensuring and improving the drying property under low humidity conditions.

  Accordingly, an object of the present invention is to provide a paint using lacquer, which shows good drying properties even in the presence of low humidity conditions and / or water, and coated wood coated with the paint. is there.

The inventors of the present invention have intensively studied to solve the above-mentioned problems. As a result, by adding a metal chelate compound, particularly a stable metal chelate compound that is difficult to decompose in both aqueous and solvent-based systems, to the lacquer, It was found that good drying properties can be obtained even under conditions of low humidity.
The present invention has been completed based on these findings and further studies.

The present invention comprises lacquer and a metal chelate compound that is soluble in an organic solvent and is stable in water, and 5 to 100 parts by weight of water and the metal chelate compound 0. By providing a coating material characterized in that it contains 5 to 100 parts by weight or is used in a state in which the metal chelate compound is a titanium chelate having a trialkanol aminate , Ru der those that have achieved the goal.

Furthermore, the present invention is to provide a paint timber obtained by coating the wood with the above paint.

This onset bright paint, a paint with lacquer, also exhibit good drying properties in the presence of low humidity conditions and / or water.
The painted wood of the present invention can be produced inexpensively and easily, and can be preferably used for applications other than traditional crafts such as architectural applications.

Hereinafter, the present invention will be described in detail based on preferred embodiments thereof.
The paint of the present invention contains lacquer and a specific metal chelate compound.

  As the lacquer used in the present invention, those conventionally used for coating with lacquer such as raw lacquer obtained from lacquer plants and purified lacquer obtained by chrome (heat dehydration) treatment can be used without particular limitation. . The raw lacquer may be any of Japan, China, Taiwan, Indonesia, Myanmar, Vietnam, etc.

The metal chelate compound used in the present invention is preferably stable to water. Many metal chelate compounds are unstable to water and easily decompose, but by using metal chelate compounds that are stable to water, additives are added to lacquer in a state of being dissolved or dispersed in water. Even when the paint is diluted with water and used, the reaction with lacquer proceeds well and good drying properties are obtained.
The degree of stability of the metal chelate compound with respect to water is, for example, when 5% by weight, 10% by weight, or 20% by weight, or 50% by weight is dissolved in water, and the residual amount after 1 hour is measured. The residual amount relative to the initial amount is preferably 10% or more, more preferably 20% or more, and further 30% or more, 40% or more, 50% or more, 60% or more, 70% or more, 80% or more. 90% or more, 95% or more, or 99% or more is more preferable in this order.

The metal chelate compound used in the present invention is preferably soluble in an organic solvent.
Since urushiol, the main component of lacquer, is oily, using a metal chelate compound that has an affinity for organic solvents has a high affinity with the main component of lacquer and improves reactivity with lacquer. The drying property of lacquer under low humidity conditions can be improved.
Whether or not the metal chelate compound is soluble in an organic solvent can be determined, for example, by determining whether or not 1 wt% or more is soluble in the solvent using isopropyl alcohol as a solvent.
The metal chelate compound is preferably 10% by weight or more soluble in isopropyl alcohol, more preferably 30% by weight or more, more preferably 50% by weight or more, and further preferably 60% or more. 70% or more and 80% or more are preferable in this order.

As a stable metal chelate compound against and water soluble in an organic solvent, in the present invention, use of a specific chelate compound metal is titanium down. That is, a titanium chelate having a trialkanol aminate is used. In particular, it is preferable to use titanium diisopropoxybistriethanolamate. Examples of the alkanol include methanol, ethanol, propanol, isopropanol, butanol and the like.
As the titanium diisopropoxybistriethanolaminate, a commercially available product can be used, and for example, trade name “Orgatechs TC-400” manufactured by Matsumoto Fine Chemical Co., Ltd. can be used. As the metal chelate compound, a compound synthesized in a liquid phase in an alcohol solution and sold as such an alcohol solution can be used.

  The amount of the metal chelate compound added to the lacquer is preferably 0.5 to 100 parts by weight, more preferably 5 to 50 parts by weight, based on 100 parts by weight of the resin component of the lacquer. Preferably it is 10-30 weight part.

The lacquer and the metal chelate compound can be sold as a mixture of the lacquer and the metal chelate compound filled in a sealable container.
Moreover, the 1st container which accommodated the 1st agent containing the lacquer and the 2nd container which accommodated the 2nd agent containing the metal chelate compound are sold as a set, or the 1st agent containing the lacquer is accommodated. Selling a composite container having a first container and a second container containing a second agent containing a metal chelate compound, such as selling a composite container without mixing the lacquer and the metal chelate compound, and using the mixture in use This is also preferable from the viewpoint of enabling the paint of the present invention to be used or stored for a long period of time.

The 1st agent containing lacquer may contain only raw lacquer or only black eye lacquer (refined lacquer), and may be a mixture of various additives. The second agent containing the metal chelate compound may be one in which the metal chelate compound is dissolved in a solvent such as alcohol. In addition, various additives may be mixed therewith.
As the additive to be mixed with the first agent or the second agent, various known materials can be used. For example, ultrafine particles (average primary particle diameter is about 100 nm or less) metal oxide (metal is zinc, titanium, And ultraviolet resistance improvers made of cerium, iron, etc.). The additive composed of ultrafine particles is preferably mixed with lacquer while being dissolved or dispersed in water.

The paint of the present invention can be used, for example, under conditions containing 5 to 100 parts by weight of water with respect to 100 parts by weight of lacquer resin, and under conditions containing 10 to 50 parts by weight of water. Can also be used, or can be used under conditions containing 20 parts by weight of water.
For example, one example of the paint of the present invention is a paint containing 5 to 100 parts by weight of water and 0.5 to 100 parts by weight of a metal chelate compound with respect to 100 parts by weight of a lacquer resin.
Moreover, the other Example of the coating material of this invention has the 1st agent containing a lacquer and the 2nd agent containing a metal chelate compound, and 5-100 weight part of water with respect to 100 weight part of resin components of a lacquer. And 0.5 to 100 parts by weight of the metal chelate compound. Water may be contained in either the first agent or the second agent, and may be contained in both the first agent and the second agent. Furthermore, it has the 3rd agent containing additives, such as the ultrafine particle mentioned above separately from the 1st agent and the 2nd agent, and the 3rd agent may contain water.

The painted wood of the present invention is obtained by painting wood with the paint of the present invention.
The wood may be various kinds of wooden materials in addition to the solid materials. Examples of the wood material include plywood, single plate laminate (LVL), particle board, MDF, and the like. As the coating method, various known methods can be used without particular limitation in wood coating, and a known coating method or the like can be used without particular limitation in wood coating, for example, brush coating, roll coater, spraying Examples include coaters. Moreover, you may paint only a part of wood, for example, only one side of a board | plate material, or only a part of the one side.
Drying of the wood after painting may be performed under high humidity conditions, but can also be performed under low humidity conditions. The humidity condition during drying may be 55% or less relative humidity, 50% or less relative humidity, and 45% or less relative humidity. Temperature conditions can be 0-50 degreeC or 10-40 degreeC, for example.
Painted wood can be used for various applications, and for example, it can be preferably used for building materials. Examples of cases where it is used as a building material include columns, beams, wall materials, floor materials, siding panels, handrails, counters, doors, and the like.

  As mentioned above, although preferred embodiment of this invention was described, each invention is not restrict | limited to said embodiment, It can change suitably.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited at all by this Example.

Example 1
Assuming that a water-based additive is added to 100 parts by weight of a commercially available lacquer (obtained from Tajima Urushi lacquer store, trade name “Shikurome lacquer”), 20 parts by weight of water is added, Mixing sufficiently, a water-containing lacquer resin composition (hereinafter referred to as a water-containing lacquer resin composition) was obtained.
To the obtained water-containing lacquer resin composition, 10 parts by weight or 20 parts by weight of titanium diisopropoxybistriethanolaminate (trade name “Orgatechs TC-400” with respect to 100 parts by weight of resin in the composition. , 80 wt% concentration, solvent isopropyl alcohol, manufactured by Matsumoto Fine Chemical Co., Ltd.) and mixed well to obtain the paint of Example 1 (two types).

(Comparative Example 1)
The water-containing lacquer resin composition prepared in Example 1 was used as a control.
(Comparative Example 2)
To the water-containing lacquer resin composition prepared in Example 1, 10 parts by weight or 20 parts by weight of a silane coupling agent (trade name “KBM-603”, Shin-Etsu Chemical Co., Ltd. with respect to 100 parts by weight of the resin in the composition. Kogyo Co., Ltd.) was added and mixed well to obtain a paint of Comparative Example 2 (two types).

(Comparative Example 3)
To the water-containing lacquer resin composition prepared in Example 1, 10 parts by weight or 20 parts by weight of titanium diisopropoxybisacetylacetonate (trade name “OrgaTix TC” with respect to 100 parts by weight of the resin in the composition. −100 ”(manufactured by Matsumoto Fine Chemical Co., Ltd.) was added and mixed well to obtain a paint of Comparative Example 3 (two types).
Titanium diisopropoxybisacetylacetonate is a solvent-based compound, which is stable to solvents and slightly unstable to water.

(Comparative Example 4)
To the water-containing lacquer resin composition prepared in Example 1, 10 parts by weight or 20 parts by weight of titanium lactate (trade name “Orgatechs TC-315”, Matsumoto Fine Chemical, based on 100 parts by weight of the resin in the composition. Co., Ltd.) were added and mixed thoroughly to obtain a paint of Comparative Example 4 (two types).
Titanium lactate is an aqueous compound that is stable in water and insoluble in solvents.

[Evaluation of dryness]
The paints obtained in Examples and Comparative Examples were applied on a glass plate to a thickness of 0.02 inches using a bar coater, and left to dry in a constant temperature and humidity chamber. The drying conditions were 20 ° C.-50% and 20 ° C.-40% as conditions more severe than room temperature and normal humidity (low humidity conditions). Evaluation of the drying property touched the surface of the lacquer coating film with a finger over time, and judged that it was dried at the time when the lacquer was not attached to the finger and the lacquer coating film was not sticky.
The results when dried at 20 ° C.-50% are shown in Table 1, and the results when dried at 20 ° C.-40% are shown in Table 2. In Tables 1 and 2, “dried in 6 to 24 hours” indicates that it was not dried at the time point after 6 hours but was dried at the time point after 24 hours.

  From the results shown in Table 1 and Table 2, the paint (lacquer resin composition) of Example 1 is a composition containing water as compared with Comparative Examples 1 to 4, and has excellent drying properties even under low humidity conditions. You can see that.

Claims (2)

It has lacquer and a metal chelate compound that is soluble in organic solvents and stable in water ,
For 100 parts by weight of lacquer resin, 5 to 100 parts by weight of water and 0.5 to 100 parts by weight of the metal chelate compound are included or used.
The paint characterized in that the metal chelate compound is a titanium chelate having a trialkanol aminate . Painted wood obtained by painting wood with the paint according to claim 1 .