JP3659909B2 - Manufacturing method for painted products - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a coated article using hybrid lacquer and / or hybrid cashew nut shell oil that can be naturally dried in a short time.
[0002]
[Prior art]
Natural lacquer forms a coating film with excellent aesthetic durability that expresses sensations such as "soft", "moist", and "deep". However, the drying is a moisture-curing coating curing material that accelerates at high humidity and does not proceed at low humidity.Since the initial drying is slow, coating defects such as “sagging” and “tamari” are likely to occur. Skill is required to manage drying because wrinkles are generated by excessive humidification. Furthermore, a curing period of one week or longer is required for complete drying.
[0003]
In this drying system, the laccase enzyme contained in natural lacquer liquor is activated in a high humidity environment, oxidizes urushiol, which is the main component, to produce oligomers, and cures through an autoxidation reaction of the urushiol side chain. In general, special drying equipment called a lacquer room is required. For this reason, development of the natural drying lacquer which has quick-drying without being influenced by humidity was desired.
[0004]
Many inventions have been proposed for the purpose of promoting the drying of natural lacquer liquids, all of which have the effect of promoting drying, but the drying speed is still unsatisfactory, and the high humidity lacquer room (Muro) Needed. For example, Japanese Patent No. 3001056 discloses a technology of a natural drying polymerization lacquer mainly composed of an auto-oxidation reaction that performs enzyme polymerization in a reaction vessel to produce a urushiol oligomer, but it takes 8 hours or more to cure. I need it.
Cashew nut shell oil, on the other hand, is widely used as an alternative to natural lacquer because it is inexpensive, but it does not cure as it is, and it is used as a curing component for paints, etc. by reacting with formaldehyde, hexamine, etc. Was. However, this oligomerization reaction not only increased the process and increased the price, but also had the problem that “it takes a long time to dry”, similar to natural lacquer.
[0005]
[Problems to be solved by the invention]
The present invention can form a high-quality lacquer (like) film at room temperature and humidity without using special equipment such as a lacquer room (room) and drying in a significantly shorter time than before. Moreover, it aims at providing the manufacturing method of the coated goods using the hybrid lacquer and / or hybrid cashew nut shell oil which do not contain a solvent.
[0006]
[Means for Solving the Problems]
As a result of diligent research, the present inventor has found that the above problem can be solved by reacting a compound having a specific chemical structure with the phenolic hydroxyl group of lacquer and cashew nut shell oil to form an organic-inorganic hybrid. The invention has been completed.
[0007]
That is, the present invention includes (A) lacquer and / or cashew nut shell oil containing a laccase enzyme, and (B) a general formula: XnSi (OR) m (wherein X is an amino group, an alkylamino group, It is a group selected from the group consisting of an aminoalkyl group, an epoxy group, an acryloxy group, a methacryloxy group and a vinyl group, R is an alkyl group, and n and m may be the same or different from each other. And a total of n and m is 4.) A room temperature quick-drying laccase enzyme obtained by mixing the compounds represented by the formula (1 ) and reacting while controlling the temperature so as not to exceed 50 ° C. A method for producing a coated product, characterized in that the hybrid lacquer and / or hybrid cashew nut shell oil is applied to the product to be coated and dried at room temperature .
[0008]
This invention is a method of manufacturing the said coated article whose (A) component is the lacquer containing a laccase enzyme .
[0009]
This onset Ming, as the component (A) is a cashew nut shell oil, process for producing the above coated product.
[0010]
Moreover, this invention is a method of manufacturing the said coated article whose (A) component is a mixture of the lacquer | lacquer containing a laccase enzyme, and cashew nut shell oil.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
The component (B) in the present invention is for modifying the phenolic hydroxyl group of lacquers and cashew nut shell oil to remarkably accelerate the curing, and is represented by the general formula: XnSi (OR) m (however, the formula Wherein X is a group selected from the group consisting of an amino group, an alkylamino group, an aminoalkyl group, an epoxy group, an acryloxy group, a methacryloxy group, and a vinyl group, R is an alkyl group, and n and m are each it is an integer of 1 to 3 may be different even in the same, the sum of n and m is Ru compound der represented by 4.). Specifically, X is an amino group, methylamino group, ethylamino group, n-propylamino group, aminomethyl group, aminoethyl group, aminopropyl group, epoxy group, acryloxy group, methacryloxy group, vinyl group, etc. Of these, an amino group, an aminomethyl group, an aminoethyl group, an aminopropyl group, an epoxy group, an acryloxy group, a methacryloxy group, or a vinyl group is preferable. Examples of R include a methyl group, an ethyl group, an n-propyl group, and an iso-propyl group, and among these, a methyl group is preferable.
This compound can be used alone or in combination of two or more. When mixed and used, hybrid lacquer and / or hybrid cashew nut shell oils having different degrees of condensation are obtained, and the water resistance is improved and the drying speed is easily adjusted.
[0012]
Preparation of a hybrid lacquer acids and / or hybrid cashew nut shell oil cold quick-drying in the present invention can be easily performed by simply mixing the components (A) and (B) components.
The lacquer in the present invention is a lacquer liquid (raw lacquer) obtained from a lacquer plant, purified lacquer obtained by subjecting fresh lacquer to “Kurome” (heat dehydration) by the method of JIS K 5950, and acetone-soluble components of fresh lacquer. Examples include urushiol, raccol or thiol obtained by concentration, alkenylcatechol obtained by chemical synthesis, or a mixture of two or more thereof. Specific examples of the alkenyl catechol include 3- (8-pentadecenyl catechol), 3- (8,11-pentadecadienyl catechol), 3-pentadecatrienyl catechol (Nagase, Miyakoshi: Paint engineering, Vol. 32, No. 11, p22-35 (1997)). In the present invention, it lacquer such are those containing a laccase enzyme in natural lacquer solution. Cashew nutshell oil is obtained from the fruits of cashew tree and contains cardanol as an active ingredient. In particular, it is preferable to use a mixture of refined lacquer obtained by treating raw lacquer with “chrome” and the other lacquer or cashew nut shell oil. Cashew nut shell oil and the lacquer can also be used as a mixture. However, when cashew nut shell oil is the main component , the viscosity and drying speed increase when component (B) is applied, When the kind is the main component, the viscosity and drying rate tend to be low.
[0013]
When component (B) is added to lacquer and cashew nut shell oil, the functional group X acts on the phenolic hydroxyl group of lacquer and cashew nut shell oil to produce a co-condensate, with heat generation. In order to increase the viscosity, the component (B) is preferably added little by little, and the temperature is preferably controlled so that the reaction system does not exceed 50 ° C., and more preferably stirred at room temperature for 1 to 3 hours.
[0014]
In the production of hybrid lacquer acids and / or hybrid cashew nut shell oil cold quick-drying in the present invention, the amount of component (B), their active ingredient (urushiol, Rakkoru, Chichioru, alkenyl catechol or cardanol 100% As) and 100 g (B) component 10-500 g, more preferably 30-300 g.
[0015]
In the present invention, the organic-inorganic hybrid lacquer and / or hybrid cashew nut shell oil obtained as described above is applied to a product to be coated and dried in a remarkably short time at room temperature. (Like) can be formed and can be used without solvent. That is, for example, even under low humidity conditions such as 20 to 25 ° C. and 40 to 50% RH (remarkably faster than a conventionally known method), the film is cured and dried within 2 hours to form a film.
[0016]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
Example 1
50 g of N-β (aminoethyl) γ-aminopropyltrimethoxysilane is added dropwise to 100 g of urushiol obtained by concentrating the acetone-soluble components of Chinese lacquer, and the liquid temperature is controlled not to exceed 50 ° C. The reaction was carried out with stirring, and a cocondensate was obtained with the end point being at room temperature. The viscosity of this reaction product was 8200 mPa · s / 20 ° C.
When this was applied to a glass plate with a 76 ± 5 μm film applicator and allowed to stand in a room at room temperature and 40 to 50% RH, it was dry to the touch in 30 minutes and cured and dried in 2 hours. The pencil hardness of the dried coating film after 24 hours was 5H, showing a light reddish brown color.
For comparison, a commercially available purified lacquer coating film tested under the same conditions was not dried even after 24 hours.
[0017]
Example 2
Co-condensation in the same manner as in Example 1 except that 100 g of N-β (aminoethyl) γ-aminopropyltrimethoxysilane was added dropwise to 100 g of 3-alkenylcatechol obtained by the cross-coupling reaction between catechol and linseed oil. I got a thing.
This reaction product had a viscosity of 7000 mPa · s / 20 ° C., and after the formation of the coating film, it was finger-dried at room temperature, 40-50% RH, 1 hour, and cured and dried in 2.5 hours. The pencil hardness of the dried coating film after 24 hours was 3H, and the gloss of the dried coating film by a 60-degree reflection gloss meter was 100%.
[0018]
Example 3
Example 1 except that 100 g of a mixture of N-β (aminoethyl) γ-aminopropyltrimethoxysilane and β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane was added dropwise to 100 g of cashew nut shell oil and reacted. In the same manner, a cocondensate was obtained.
This reaction product had a viscosity of 5500 mPa · s / 20 ° C., dried at the normal temperature, 40 to 50% RH for 2 hours, and then cured and dried for 5 hours. The pencil hardness of the dried coating film after 24 hours was 2H, showing a pale yellow color.
[0019]
Example 4
100 g of urushiol obtained by concentrating acetone-soluble components of Chinese lacquer and 100 g of cashew nut shell oil are mixed, and 50 g of N-β (aminoethyl) γ-aminopropyltrimethoxysilane is added dropwise to react. A cocondensate was obtained in the same manner as in Example 1 except that.
This reaction product had a viscosity of 5500 mPa · s / 20 ° C., and after the formation of the coating film, it was dry to the touch at room temperature, 40 to 50% RH for 1 hour, and cured and dried for 3 hours. The pencil hardness of the dried coating film after 24 hours was 3H, and the gloss of the dried coating film by a 60-degree reflection gloss meter was 100%.
[0020]
Example 5
N-β (aminoethyl) γ-aminopropyltrimethoxysilane and β- (3,4-epoxy) were added to 100 g of purified lacquer (including laccase enzyme) treated with Chinese lacquer according to the method of JIS K 5950. A cocondensate was obtained in the same manner as in Example 1 except that 60 g of a mixture with (cyclohexyl) ethyltrimethoxysilane was dropped and reacted.
The viscosity of this reaction product was 8500 mPa · s / 20 ° C. After the coating film was formed, it was dried by touch at room temperature, 40 to 50% RH for 30 minutes, and cured and dried in 2 hours. The pencil hardness of the dried coating film after 24 hours was 5H.
[0021]
Example 6
Purified lacquer (including laccase enzyme) treated with Chinese lacquer according to the method of JIS K 5950 (50 g) and 50 g cashew nut shell oil are mixed, and N-β (aminoethyl) γ-aminopropyl is mixed therein. A cocondensate was obtained in the same manner as in Example 1 except that 100 g of a mixture of trimethoxysilane and β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane was dropped.
The viscosity of this reaction product was 4000 mPa · s / 20 ° C. After the coating film was formed, it was finger-dried at room temperature, 40-50% RH, 40 minutes, and cured and dried in 3 hours. The pencil hardness of the dried coating film after 24 hours was 3H.
[0022]
【The invention's effect】
As described above, in the present invention, (A) and component (B) were mixed, stirred together with the temperature controlled to not exceed 50 ° C., hybrid organic by simple operation of Ru reacted -Inorganic hybrid lacquer and / or hybrid cashew nut shell oil can be applied to a product to be coated and dried at room temperature to produce a coated product in a remarkably short time. It is high, can form a film with no wrinkles, and has a quality equivalent to or better than a film formed from natural lacquer by a traditional method.
The hybrid lacquer acids and / or hybrid cashew nut shell oil cold quick-drying in the present invention the wood has a high adhesion to such as paper.
Therefore, special equipment such as a lacquer room (Muro) is not required, and the painting efficiency and adhesion efficiency can be remarkably improved, which means that it is possible to develop lacquer in industrial painting and adhesion fields. Have.

Claims (4)

(A) Lacquer and / or cashew nut shell oil containing laccase enzyme, and (B) General formula: XnSi (OR) m (where X is an amino group, alkylamino group, aminoalkyl group, epoxy group) A group selected from the group consisting of an acryloxy group, a methacryloxy group and a vinyl group, R is an alkyl group, and n and m are each an integer of 1 to 3 which may be the same or different, and , N and m are 4). The hybrid lacquer containing a room temperature quick-drying laccase enzyme, obtained by mixing the compounds represented by ( 4) and reacting while controlling the temperature so as not to exceed 50 ° C. and / or Alternatively, a method for producing a coated product, wherein the hybrid cashew nut shell oil is applied to the product to be coated and dried at room temperature. The method for producing a coated product according to claim 1, wherein the component (A) is a lacquer containing a laccase enzyme . The method for producing a coated product according to claim 1, wherein the component (A) is cashew nut shell oil . The method for producing a coated product according to claim 1, wherein the component (A) is a mixture of lacquer containing laccase enzyme and cashew nut shell oil.