JPS5959269A - Method for drying coating film of lacquer paint - Google Patents

Abstract

PURPOSE:To dry a coating film in a shortened time for the mass-production of coated bodies, by subjecting a coating film formed by the irradiation of paint such as refined Japanese lacquer or cashew paint with ultraviolet rays in a short time. CONSTITUTION:The coating film of lacquer paint such as refined Japanese lacquer or cashew paint comprising the reaction product of a cashew nut shell liquid with formaldehyde is subjected to ultraviolet irradiation in a short time. Hence, the drying of said coating film can be remarkably shortened without injuring the property of the coating film, so that the mass production of coated bodies can be attained.

Description

[Detailed description of the invention] The present invention relates to a method for drying a coating film of a systematic paint.

Conventionally, system paints such as Kuni $'+ (hereinafter referred to as Kanni paints), which are made using purification methods, kneading, or the reaction product of Kanny nut shell liquid and formaldehyde, have excellent coating performance1, and are highly effective for arts and crafts9. Widely used in everyday practical items.

However, since these paint systems dry slowly, dirt may adhere to them, and the paint film may sag or run during the drying process. Furthermore, if the coating film is thick, there is a risk that wrinkles may occur on the coating surface, impairing the aesthetic appearance.

The purpose of the present invention is to eliminate the conventional drawbacks, significantly shorten the drying time of the lacquer-based coating A1, and to make it possible to significantly shorten the drying time of the lacquer-based coating A1. This invention provides a method for drying a pattern of a systematic paint that can achieve high productivity, and will be described in detail below.

In order to solve all the problems that occur in the conventional drying process, the inventors of the present invention, Nagisa, et al. It has been found that the drying time of conventional coatings can be significantly shortened by using the same method.

The purification method used in the present invention is to purify the sap itself (an emulsion of water and lacquer called raw lacquer) to 7 to 8 g.
It is refined by heating it while kneading it for a long time to evaporate the moisture contained in the raw lacquer.During the heating process, 7L of dry oil such as linseed oil is mixed into the 115 lacquer to remove moisture. This includes evaporated so-called Shugo lacquer.

In other words, the horn/knee coating used in the present invention refers to the horn/knee shell liquid] (7 parts of hexamethylenetetramine, which is a combination of formaldehyde and ammonia, and a reaction catalyst per 10 parts by weight). Add a small amount, 150~]
The reaction was carried out at 60 DEG C. for about 4 hours, and a small amount of a metal salt such as naphthenic acid or octenoic acid was added thereto as a diluting solvent and a drying accelerator for the coating film to prepare a paint.

The gist of the present invention is to accelerate drying of the coating film by applying ultraviolet rays for a short period of time to the coating film formed by applying the above-mentioned purification method and a system coating such as Cunny Coating 1.

As a light source for irradiating ultraviolet rays, a commercially available mercury lamp can be used, which is practically simple.
A light source containing a large amount of
nr, but the optimum range for the present invention is 20 to 4 Q W/
,,is.

Conventional drying of oil-based paints with air begins with the paint film absorbing air oxygen without wiping.

In other words, this absorption occurs because the double bonds contained in the oil-based paint are
In the case of non-conjugation, it is added to the adjacent methylene group (-CH2-) as hydroperoquinol (-001-I'),
It is known that conjugation mainly involves direct addition to double bonds [Mihara, Iro 4g', I16, 15J (1973
)]. The dryer normally used at this time (organic 1'!2 salts of center-position metals) is a 1/dox as an accelerator for the decomposition of the above-mentioned oxygen compounds and the action of abstracting hydrogen from the notyl/n groups. It is a catalyst. (=JIn any case, the reason for this is that the induction period for atmospheric oxygen to become hydroperoginode or oxygen adduct is long) 1. oil 1
The slow drying of green paint was the main factor.

? Many studies have been conducted for a long time regarding the short induction period of JE. That is, a typical example of an effective method is a study by Dr. D., A. Berry, et al. on the influence of potential energy.

Coff1c, Dig-, 32 (NO, -122) 34
0 (J 96(1)).

This means that in the presence of a cobalt dryer, blue light can promote the absorption of osulfur by 37 times compared to dark light, and a similar fact is also reported by Funke. [:Dcut
, FarbenZ, , 21(5) 233 (196N
].

It was found that including ozonated oxygen in R. close during drying promotes the same effect, and CInd, LockinBet
, rieb, : (6(3) 234 (1968)) Furthermore, the ability to promote ozone production under ultraviolet irradiation has also been reported. [Nagakura, painting technology, 1 (+7 n, (9)
90: Pe1nt Pig, Vernis, 46
．． 155 (1970) 1 However, these tours all concern oil-based paints, and there are practical problems in terms of size, etc.
Actually, it has not been put into practical use. Furthermore, the special paints targeted by the present inventors, such as purified lacquer and Cafney paints, were completely unknown and unclear.

In other words, in the purification method, the main component kur/ol is cured and dried using air oxygen through the action of an enzyme called urushilacase.
c15H27) Cardanol string and cardol formaldehyde condensed soy sauce is hardened and dried with air oxygen in the presence of an ordinary metal dryer.

Next, the present invention will be further explained with reference to examples.

〈Example 1〉 Tosei lacquer was rolled onto a glass plate using a doctor's rail at 76
After applying μmK, immediately turn on a high-pressure mercury lamp (output: +30 Wa).
rm and the wavelength range is 2 (,1 (1 to 670 nm) below 20
cm, let it stand for 0 seconds, then let it stand in a constant temperature and humidity room with a humidity of 80% and a temperature of 20°C, and then dry to the touch for 2 hours (no fingerprints will be left even if you touch it with your fingers). ), curing and drying]
(] 11.!? It was lff1.

Comparative Example l〉 After applying the purification method in the same manner as in Example 1 and immediately leaving it at a constant temperature and humidity, it was dry to the touch in 5 hours and hardened to 2.
It was 4 hours.

<Example 2> Horn/knee black () J Tsuyu Natsu/L M l 00
Coating I) containing a black colorant in the reaction product of 1 part of hexamethylenetetramino and 7 parts of hexamethylenetetramino is applied in the same manner as in Example J, immediately irradiated with ultraviolet rays for 30 seconds with a high-pressure mercury lamp, and then It was left in a constant temperature and humidity room. Dry to the touch for 1 hour 30 minutes
The drying time was 4 hours.

Comparative Example 2 Cashew black was applied in the same manner as in Example 1, and immediately placed in a constant temperature and humidity room. Dry to the touch took 3 hours and 30 minutes, and drying took 8 hours.

<Example: 3> Cashew transparent (paint made from the reaction product of 100 parts by weight of Kanyuna Sosonoel liquid and 5 parts by weight of hexamethylenetetramine) was applied in the same manner as in the previous example, and immediately heated with a high-pressure mercury lamp for 3
The sample was irradiated with ultraviolet rays for 0 seconds, and then placed in a constant temperature and humidity chamber. It took 4 hours and 30 minutes to dry to the touch, and 9 hours to cure.

Comparative Example: 3> Cashew transparent was applied in the same manner as in Example 1, and immediately placed in a constant temperature and humidity chamber and allowed to stand. Dry to the touch was 10 hours, and dry to the touch was 15 hours.

The appearance of the coating films of Examples 1 to 3 and Comparative Examples 1 to 3 were as shown in Table 1 below.

Table 1 Note that the pencil hardness was determined by VtCl11 after being left in a constant temperature and humidity chamber for an additional 7 days.

According to the present invention, it is possible to significantly shorten the drying time of the paint film of the flow-based paint, and the film performance is comparable to that of conventional paints. You can learn more about how to dry the paint film.

In the above description, U! of one embodiment of the present invention is described. Although only abbreviations have been shown, it will be obvious that changes to the gods can be made without departing from the 81 yen increase of the present invention.

Procedural Amendment (Voluntary) October 251, 1982 1. Indication of the case 1988 Patent Application No. 169170 2. Title of the invention 3. Method for drying a coating film of flow-based paint 3. Relationship between patent applicant fl 11i 8-12-5 Nishioku, Arakawa-ku, Tokyo 1.6.A, F+,) Power/-ichi Co., Ltd. President Hideo Shimizu 4, agent 101-5 Amendment order Date (voluntary) Application, specification ('-, -, t, ・1・1
＼ , −7ε Correction details as shown in the attached sheet

Claims (1)

[Claims] It is characterized by irradiating ultraviolet rays for a short period of time to accelerate drying of lacquer-based coatings such as lacquer-based paints, which are made of the reaction product of purification and formaldehyde. Method of drying the coating film of the system paint.