JP4999607B2 - Repair agent for lacquer coating - Google Patents

Description

  The present invention relates to a repair agent for a lacquered paint, a repair method for astringent paint, and a repaired lacquer 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 resin, polyurethane resin, acrylic resin, fluorine resin, polyester resin, silicone resin, acrylic silicone resin, etc., but these are problems of resource depletion and global warming. We have environmental problems such as gas emission problems.

  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 abrasion resistance, and has been used mainly for painting crafts since ancient times. Moreover, as a recent technique, Patent Document 1 is a lacquer-based paint obtained by kneading naturally produced lacquer or refined lacquer, and the water-in-oil emulsion having a particle size of 10 to 80 nm is high. It has been proposed as a glossy coating.

  However, the amount of lacquer used has been declining year by year, and at the same time, the number of skilled lacquer craftsmen has been declining. There is even a fear of end. In order to maintain such a current lacquer industry, it is necessary to develop applications other than traditional crafts and to develop them in other fields.

JP 2007-9023 A

As an application of lacquer other than traditional crafts, industrial use of lacquer coating in the field of building materials can be considered.
However, when considering the use of lacquer in the field of building materials, there are several issues to be solved. One of them is that maintenance is not easy. For example, it is possible that an architectural interior member painted with lacquer will be scratched by accident and the coating may be damaged, but in such a case, an ordinary person who does not have skills in lacquer can be irritated and expensive. It is extremely difficult to repair damaged parts using easy lacquer. In addition, the actual repair work needs to be harmonized between the repaired part and its peripheral part (non-damaged part), but it is also difficult to adjust the subtle color condition while grinding the periphery with sandpaper. . In other words, there are no other methods for repairing building materials coated with lacquer, except for lacquered craftsmen who visit the site. .
Thus, in order to promote the use of lacquer in the field of architectural coating, it is necessary to solve this maintenance problem. Is also beneficial.

Therefore, the objective of this invention is providing the repair agent and repair method of a lacquered thing which can repair the coating-film damage site | part of a lacquered thing safely and simply.
Another object of the present invention is to provide a repaired lacquered product in which the color of the repaired part is in harmony with the color of the other part and the repaired part is inconspicuous.

The inventors of the present invention have intensively studied to solve the above-mentioned problems. As a result, the damaged part of the lacquered product is coated with a mixture of astringency and a basic water-soluble compound or an aqueous solution thereof on the damaged part. It has been found that the color difference of the damaged part can be reduced and the time required to confirm the harmony of the color of the repaired part and the other part can be greatly shortened.
The present invention has been completed based on these findings and further studies.
It should be noted that using a synthetic resin paint that has been adjusted in advance to a lacquer tone is not suitable for the purpose of the present invention to utilize lacquer, which is a natural material.

  This invention achieves the said objective by providing the repair agent of the lacquer coating thing which consists of persimmon astringency, a basic water-soluble compound, or its aqueous solution (Hereafter, when this invention is called 1st invention, this invention is said. Say).

  In addition, the present invention provides the above-mentioned object by providing a method for repairing a lacquered product, which is characterized in that a coating of a lacquered product and a mixture of a basic water-soluble compound or an aqueous solution thereof are applied to a damaged part of the lacquered product. (Hereinafter, the second invention is referred to as this invention).

  Furthermore, this invention provides the repaired lacquered coating material obtained by repairing the coating-film damage site | part of a lacquered coating material using the repair agent in any one of Claims 1-4 ( Hereinafter, the third invention refers to this invention).

According to the repair agent and the repair method for a lacquered product of the present invention, the damaged part of the coating film of the lacquered product can be repaired safely and easily.
In the repaired lacquered article of the present invention, the repaired part color is inconspicuous with the repaired part color in harmony with the other part color.
In the present invention, it is not necessary to use dyes or pigments, particularly synthetic dyes or synthetic pigments, but the use of them is not excluded. However, when using dyes and pigments, it is preferable to use dyes and pigments made of natural materials.
In addition, as another effect of the present invention (first and second inventions), one or more of the following effects can be achieved. That is, the hue is in harmony with other parts. The color is determined in a short time unlike the astringent astringency that takes time to develop. Unlike lacquer, it cures at room temperature and humidity. Does not wear like lacquer. Cheaper than lacquer. Application is simpler than lacquer. Like lacquer, it is a natural product. Unlike synthetic resin paints, it does not contain organic solvents. Unlike synthetic resin paint, the wood grain is not painted, so the tone of the wood as well as the color tone is harmonized.

Hereinafter, the present invention will be described in detail based on preferred embodiments thereof.
The repair agent for the lacquered product according to the first aspect of the invention consists of amber astringent and a basic water-soluble compound or an aqueous solution thereof.

The basic water-solubilized product in the present invention has a function of promoting color development of the persimmon by mixing with the persimmon.
The basic water-soluble compound used in the present invention can be used without particular limitation as long as the aqueous solution shows basicity and the aqueous solution shows basicity. Examples of such basic water-soluble compounds include alkali metal hydroxides represented by sodium hydroxide and weak acid salts, alkaline earth metal hydroxides represented by calcium hydroxide, and the like. Examples include weak acid salts, amines (such as ammonia) and weak acid salts. The basic water-soluble compound is preferably a weak acid and alkali metal salt, a weak acid and alkaline earth metal salt, or a weak acid and amine salt. A basic water-soluble compound can be used individually by 1 type or in combination of 2 or more.

Although strong bases such as sodium hydroxide and weak bases such as sodium carbonate are effective in promoting color development, these bases, especially strong bases, must be added as a sufficiently dilute solution. Gelling of astringent astringent or denatured precipitate occurs. Therefore, these strong bases and weak bases with relatively strong basicity are inconvenient when you do not want to add water to the astringent fruit.
From this point of view, alkali metal salts or alkaline earth metal salts of weak acids such as sodium acetate, sodium citrate, sodium adipate, sodium salicylate, and sodium phosphate (provided that the aqueous solution is alkaline) are preferable. Further, a metal salt in which the weak acid is carboxylic acid or phosphoric acid is more preferable, and sodium acetate is particularly preferably used from the viewpoint of safety and price.

The persimmon astringent used in the present invention is obtained by fermenting a liquid material obtained by squeezing persimmon, and as the persimmon astringent, various known ones can be used without particular limitation, and Japanese Patent Application Laid-Open No. 2000-355675. Alternatively, those described in JP 2003-53707 A can also be used. Commercially available astringent astringents can also be preferably used. There are no particular restrictions on the variety of persimmon, the fermentation years of persimmon, the species of bacteria used for fermentation, the tannin content of persimmon, baume, acidity, the presence or absence of additives, and the like.
As an example of the persimmon astringent used preferably, the cultivar is Tenno koji, which has a fermentation period of half a year, a tannin content of 5%, and an acidity of 3-4. It is preferable to use the persimmon astringent so as to adjust the content ratio of tannin to 0.5 to 10% by weight, particularly 1 to 5% by weight.

  The amount of the basic water-soluble compound added to the persimmon astringency varies depending on the target persimmon astringency, the concentration, and the content, and cannot be uniformly defined. It is preferable to add 10 to 10% by weight, more preferably 0.5 to 5% by weight, and still more preferably 1 to 3% by weight. In addition, as for the addition amount of the water-soluble compound when adding as aqueous solution, it is preferable that the weight converted into the weight before melt | dissolution is in said range. Moreover, when adding a water-soluble compound as aqueous solution, it is preferable that the addition amount of this aqueous solution shall be 0.1-300 weight% with respect to the weight of persimmon.

  Moreover, the mixing ratio of a preferable basic water-soluble compound (in terms of solid content) based on the amount of tannin in persimmon astringent is 1 to 2000% by weight, more preferably 5 to 5%, based on the weight of tannin in persimmon. 1000% by weight, more preferably 10 to 600% by weight.

  The basic water-soluble compound may be added in a solid state such as a powder to the persimmon astringent, or may be added as an aqueous solution. It is preferable to mix after the addition. As the mixing method, various known methods can be employed without any particular limitation, and various stirrers, mixers, and the like can be used. After adding astringency and a repair agent to the container, the container may be shaken.

The repair agent for a lacquered product according to the present invention is preferably one in which amber astringency and a water-soluble compound or an aqueous solution thereof are in a non-contact state before being used, and are mixed and used at the time of use.
As a preferable distribution (sales) form of the repair agent for the coated product of the present invention, a first container containing strawberries and a second container containing a basic water-soluble compound (which may be powder or aqueous solution) are used. Distribute (sell) as a set, or distribute (sell) a composite container having a first container that contains strawberries and a second container that contains a basic water-soluble compound (powder or aqueous solution). ).

  In the repairing method for astringent paints of the second invention, a mixture of persimmon astringent and a basic water-soluble compound or an aqueous solution thereof is applied to the damaged part of the lacquer paint. It is preferable that the repair agent for the lacquered product of the first invention is applied to the damaged part of the coating film of the lacquered product in a state in which astringent and a basic water-soluble compound or an aqueous solution thereof are mixed.

A lacquered product is obtained by applying a lacquer coating to a base material such as wood, paper, or cotton.
Examples of lacquer used for the formation of a lacquer coating film include raw lacquer obtained from lacquer plants and purified lacquer obtained by chrome (heat dehydration) treatment of raw lacquer.

  In this invention, the object which applies the mixture (repair agent) of amber astringency and a basic water-soluble compound or its aqueous solution is a part where the coating of the lacquered material is damaged. The damaged part of the paint is naturally caused by long-term use of the lacquered material, or it is caused by an accidental accident such as dropping the lacquered material or hitting another object on the lacquered material. The repairing agent in the present invention may be applied to a paint damage site where the background of the base material is exposed, or may be applied to a portion where the surface of the coating film is damaged although the base material is not exposed. Moreover, you may apply a repairing agent to the range wider than a coating damaged part. As the coating method of the repair agent, a known coating method or the like can be used without particular limitation in wood coating, and examples thereof include brush coating, roll coater, spray coater, and waste cloth.

The wood as the base material of the lacquered product may be a solid material or various wood materials. Examples of the wood material include plywood, single plate laminate (LVL), particle board, MDF, and the like. As the paper, various known papers such as Japanese paper and kraft paper can be used. Examples of building materials when the lacquered product is a building material include columns, beams, wall materials, flooring materials, paneling, handrails, counters, doors, and the like.
The repaired lacquered product of the third invention is obtained, for example, by applying a repair agent to the damaged part of the coating film of the lacquered product and then drying it. As a drying method, various known drying methods can be used without particular limitation in wood coating and the like, and examples thereof include natural drying and hot air drying.

According to the repair using the repair agent of the first invention or the repair method of the second invention, the damaged coating film of the lacquered product can be repaired safely and easily. Moreover, the harmony of the color of a repair site | part and a non-repair site | part can be confirmed at an early stage. Such an effect can be obtained by using only an additive having high safety for the human body, such as sodium acetate. Moreover, since it is not necessary to contain an organic solvent, it is difficult to cause the occurrence of an organic compound.
In addition, persimmon astringent, basic water-soluble compounds, and mixtures thereof in the present invention are limited to the extent that they do not interfere with the effects of the present invention, pH adjusters and buffering agents, alcohol that promotes drying, and inorganic that enhances coating film performance. Other additives such as a filler may be included.

  As mentioned above, although preferable embodiment of this invention (1st-3rd invention) was described, each invention is not restrict | limited to said embodiment, It can change suitably.

  Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the examples.

[Manufacture of lacquered sample plates]
Each of the cedar and cypress materials was coated with a mixture of commercially available raw lacquer and turpentine oil at a ratio of 1: 1 (weight ratio), and then wiped off with a waste cloth. These samples were housed in a thermostatic bath and cured under conditions of 25 ° C. and 85% relative humidity.
Next, the raw lacquer was directly applied to these samples with a waste cloth without dilution, and the excess lacquer solution was sufficiently wiped off with another waste cloth. These samples were accommodated again in a thermostatic bath and cured under conditions of 25 ° C. and a relative humidity of 85% to obtain a lacquered product (lacquered sample plate) used in the test described below.
In addition, a vinyl tape was affixed to a part of the surface of the material in advance so that the lacquer liquid was not coated on the part. After the lacquer was dried, the vinyl tape was peeled off, and the part where the lacquer was not attached was regarded as a damaged part of the coating film of the lacquered product, and in the next repair test, a repair agent was applied to this part.

[Evaluation Test 1]
The following tests were performed using a commercially available strawberry shibu (made by Tomiyama Co., Ltd., liquid).
The commercially available strawberry astringent was a liquid containing about 5% by weight of tannin, and in the following examples, it was used as a strawberry astringent liquid without dilution.
0 g, 1.5 g or 3 g of sodium acetate (solid) was added to 100 g of persimmon astringent liquid, and stirred until they were sufficiently mixed. The obtained liquid mixture was made into repair liquid 1,2,3 in order with little addition amount of sodium acetate. The repair liquid 1 is a persimmon astringent itself to which nothing has been added.
Next, the repair liquids 1, 2, and 3 were applied to the portion of the lacquered sample plate (cedar and cypress) that was assumed to be a damaged portion of the coating film and allowed to dry naturally. This coating and drying operation was repeated three times to obtain a repaired sample plate (repair sample plate) corresponding to each repair solution.

About each repair sample board, the color was measured using the color difference meter (CR-200 by Minolta). The color was evaluated by lightness (L ^* ) and saturation (a ^* ).
FIG. 1 and FIG. 2 show colors (L ^* , a ^* ) when 72 hours have elapsed after the completion of the application of the repair agent. FIG. 1 shows the result of the repair sample plate using the cedar material, and FIG. 2 shows the result of the repair sample plate using the cypress material.

In FIG. 1 and FIG. 2, “Comparative Example 1” is the result of applying and drying the repair solution 1 (sodium acetate addition amount 0% by weight), and “Example 1” is the repair solution 2 (sodium acetate). (Example 2) is a result when the repair solution 3 (addition amount of sodium acetate 3% by weight) is applied and dried.
Moreover, in FIG.1 and FIG.2, "(circle) lacquer coating part" is a measurement result of the part (non-coating film damage site | part) which formed the lacquer coating film in a lacquer coating sample board, "□ repair agent 1-3 times. “Coating” is the measurement result of the repaired part when the repairing agent is applied three times repeatedly to the coating film damaged part of the lacquered sample plate as described above. In addition, “◇ repair agent 1-1 coating” and “△ repair agent 1-2 coating” changed the number of times of applying the repair agent to the coating film damaged part of the lacquer coating sample board once and twice. It is a measurement result in the case.

As is clear from the results shown in FIG. 1 and FIG. 2, when the repair was performed only with astringency (Comparative Example 1), there was a large difference in color, particularly lightness L, between the repaired part and the part that was not repaired. It can be seen that the color of the part and the part not repaired are not in harmony.
On the other hand, when repaired according to the present invention (Example 1 and Example 2), the colors of the repaired part and the part that has not been repaired are similar, and the repaired part and the part that has not been repaired are in harmony. You can see that Further, when repaired according to the present invention, the repaired portion of the grain is not painted, and in this respect also, the harmony with the non-repaired portion (non-damaged portion) is excellent. In addition, in addition to the time when 72 hours passed after completion of the application of the repair agent, the color of the repair site of the repair sample plate of Example 1 and Example 2 was also measured when 168 hours passed after the completion of the application of the repair agent. However, the value is almost the same as the value after 72 hours, and it can be seen that the color change has already been almost completed at the time point after 72 hours.

  Sodium acetate itself is a transparent crystal, and its aqueous solution is also colorless and transparent. Moreover, wood is not discolored only by applying an aqueous solution of sodium acetate only to wood. Therefore, the difference between the example and the comparative example is the result of sodium acetate acting on the persimmon.

[Evaluation Test 2]
Using cedar materials, a lacquered product (lacquered sample plate) used in the test was obtained in the same manner as described above. Moreover, while applying the following repair liquid 4-7 to the coating-film damaged part of this lacquer coating sample board, the frequency | count of application | coating of a repair agent was each made twice. Otherwise, the evaluation test was performed in the same manner as in the evaluation test 1.
Repair liquid 4: Amber astringent only Repair liquid 5: A mixture of amber astringent and ammonium acetate (neutral water-soluble compound) Repair liquid 6: A mixed liquid of amber astringent and sodium acetate Repair liquid 7: A mixed liquid of amber astringent and sodium carbonate Repair liquid 8: Mixed liquid of persimmon astringent and sodium hydroxide In repair liquids 5 to 8, the amount of sodium acetate, ammonium acetate, sodium carbonate and sodium hydroxide added was 1.5% by weight, respectively, relative to the weight of persimmon .

FIG. 3 shows the result of the evaluation test 2. As shown in FIG. 3, when sodium acetate (repair solution 6), sodium carbonate (repair solution 7), or sodium hydroxide (repair solution 8) was used as the basic water-soluble compound, it was repaired only with astringency. Compared to the case (Repair Solution 4), the difference in color between the repaired part and the non-repaired part (non-damaged part) is small, and the colors of the repaired part and the non-repaired part are in harmony. Was. On the other hand, when repairing only with astringency (repair solution 4) and using a neutral water-soluble compound (repair solution 5), the color (lightness L ^* and Saturation a ^* ) is greatly different, and the color is not harmonized between the repaired part and the non-repaired part. In addition, when repairing with the repair agents 6-8, the grain of the repaired part was not painted, and the tone of the grain was in harmony with the repaired part and the part that was not repaired.

FIG. 1 is a graph showing colors (lightness L ^* and saturation a ^* ) of a repaired part and a non-repaired part (lacquered part) after repairing a lacquered cedar material, (a) is a comparative example, b) and (c) are examples. FIG. 2 is a graph showing colors (lightness L ^* and saturation a ^* ) of a repaired part and a non-repaired part (lacquered part) after repairing a lacquered cypress material, (a) is a comparative example, b) and (c) are examples. FIG. 3: is a graph which shows the color (lightness L ^* and chroma a ^* ) of the repair site | part after repairing a lacquered cedar material, and a non-repair site | part (lacquer coating part).

Claims (6)

  A repair agent for lacquered products, consisting of persimmon astringent and a basic water-soluble compound or an aqueous solution thereof.   The water-soluble compound is at least one selected from the group consisting of a salt of a weak acid and an alkali metal, a salt of a weak acid and an alkaline earth metal, and a salt of a weak acid and an amine. Repair agent for lacquered products.   The repair agent for lacquered objects according to claim 2, wherein the water-soluble compound is sodium acetate.   The repair of the lacquered paint according to any one of claims 1 to 3, wherein, before use, the strawberry astringent and the water-soluble compound or an aqueous solution thereof are in a non-contact state and are mixed and used at the time of use. Agent.   A method of repairing a lacquered product, characterized in that a mixture of amber astringent and a basic water-soluble compound or an aqueous solution thereof is applied to the damaged part of the lacquered product.   A repaired lacquered product obtained by repairing a coating film damaged portion of a lacquered product using the repair agent according to claim 1.

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