JPS62106966A - Alkyd resin paint composition - Google Patents

Abstract

PURPOSE:To obtain a paint compsn. which gives a coating film having excellent initial hardness and tack-freeness after drying at low temp., by blending a room temperature curing alkyd resin with a short-oil alkyd resin or an acrylic resin and an amino resin. CONSTITUTION:A paint compsn. is obtd. by blending 100pts.wt. room temperature curing alkyd resin with 10-100pts.wt. short-oil alkyd resin or acrylic resin and 10-100pts.wt. amino resin or acrylic resin and 1-50pts.wt. amino resin. As the alkyl resin, an oxidative polymn. type modified alkyd resin is generally used and alkyd resins modified with a phenolic resin, an epoxy resin, an acrylic resin or a urethane resin, etc. can also be used. As the amino resin, low- temperature crosslinking melamines such as methylolmelamine are preferred.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to the improvement of alkyd resin coating compositions, and in particular to the improvement of alkyd resin coating compositions that provide coatings with excellent tack-free properties and initial hardness after low-temperature drying. The present invention relates to a food composition.

[Prior art] Conventionally, when applying room-temperature curing alkyd paints to automobiles, buildings, electrical equipment, and their parts, etc., drying was done in consideration of slow room-temperature drying speed and ease of handling after painting. Forced drying is performed using a furnace. However, when the part is in a semi-cured state and the temperature is high, such as immediately after drying in a drying oven, the paint film may remain sticky. Conventionally, as a means to improve this non-stick property, that is, tack-free property, changes in the type of modified oil of alkyd resin and addition of metal chelate compounds (Japanese Patent Application Laid-Open No. 52-69437,
JP-A-51-8324) is known. However, even with these methods, it cannot be said that the tack-free property is necessarily improved sufficiently.

This tack-free property is due to the glass transition point of semi-cured resin < TQ
However, the crosslinking reaction is slow in room temperature drying alkyds (oxidation polymerization type), and even if you change to modification or change the type and amount of dryer, the TQ point will not increase due to sufficient crosslinking. No improvement can be expected. Also, by adding a metal chelate compound, internal curing progresses and drying becomes faster, but stickiness remains when the temperature of the part is high.

[Problems to be Solved by the Invention] The present invention overcomes the above-mentioned drawbacks, and has excellent tack-free properties and initial hardness of the coating film after low-temperature drying, and has poor water resistance, corrosion resistance, and impact resistance. An object of the present invention is to provide an alkyd resin coating composition that provides a coating film that is free from scratches.

[Means for Solving the Problems] The full-kid resin coating composition of the present invention comprises 100 parts by weight of a cold-curing alkyd resin, 10 to 100 parts by weight per ft of short oil-length alkyd resin or acrylic resin, and 1 part by weight of an amine resin.
~50 type mouth.

The above room temperature curable alkyd resin refers to an alkyd resin that can be dried and cured at room temperature. As the alkyd resin, an oxidative polymerization type air-drying oil-modified alkyd resin is usually used, which can be further modified with a phenol resin, an epoxy resin, an acrylic resin, a urethane resin, or the like.

The above amino resin refers to a resin obtained by condensing melamine, urea, benzoguanamine, etc. with formalin, and the amine resin is a methylolated melamine, which is a low-temperature crosslinking type melamine, a methylolated product of urea, or a methylolated product of penzoguanamine. Among these, low-temperature crosslinking melamine such as methylolated melamine is preferred.

However, regarding amino resins, those having a low degree of methylolation, and those having a relatively small number of methylol groups such as mixed ether types such as methylated and butylated resins do not necessarily have good low-temperature drying properties. Therefore, in order to improve low-temperature drying properties, it is preferable to have a relatively high degree of methylolation.

In this composition, the composition ratios of each component are as described above for the following reasons.

In this composition, the room temperature curing alkyd resin 100
10 to 1 part by weight of the short oil length alkyd resin, etc.
The reason why 00 parts by weight is blended is that if it is less than 10 fflffi parts, the effect of improving tack-free properties after low-temperature drying is small.
If the amount exceeds 100 parts by weight, if the amount of amino resin blended is small, there will be a large amount of uncrosslinked parts during low temperature drying, and tack-free property will not be improved, and if the amount of amino resin blended is large, crosslinking will occur. This is because there are too many parts and the coating film becomes too hard. Therefore, the blending amount of the amino resin is
It is determined mainly by the relationship with the blending amount of the short oil length alkyd resin, etc., and is blended in 1 to 50 parts by weight per 10 to 100 parts by weight of the short oil length alkyd resin. That is, said 1
If it is less than 1 part by weight, there will be a lot of uncured parts when drying at low temperature.
This is because the tack-free property is not sufficiently improved.
When the amount exceeds 50 parts by weight, the amount of crosslinked parts becomes too large;
This is because the coating film becomes too hard. In particular, the blending amount of the amino resin is preferably 3 to 20 parts by weight based on 100 parts by weight of the short oil length alkyd resin. This is because there are few unlinked parts and an appropriate crosslinked structure. Furthermore, the blending amount of the amino resin is 100% of the short oil length alkyd resin, etc.
When the amount is about 10 parts by weight, the amount of the short oil length alkyd resin is preferably 10 to 11 parts by weight per 100 parts by weight of the room temperature curable alkyd resin. In this case, as shown in Table 1 (Example 1.2), the tack-free properties and water resistance are especially excellent after low-temperature drying.

The paint composition of this paint crude may contain not only the above-mentioned resins but also pigments, additives, solvents, and the like. Various pigments can be selected depending on the purpose and use, but examples include inorganic pigments such as carbon black, red iron, and titanium white, organic pigments such as phthalocyanine and quinacridone, and calcium carbonate, tar, clay, and carbonic acid. Extender pigments such as magnesium and barium sulfate can be used. These additives include dryers, antifoaming agents,
Leveling agents, dispersion aids, color separation inhibitors, etc. can be used. As a solvent, commonly used aromatic solvents such as toluene and xylene, alcoholic solvents such as butanol and methanol, and MEK are used.

Ketone solvents such as MrBK, ether solvents such as butyl cellosolve, and the like can be used.

[Effects of the Invention] The room temperature curable alkyd resin 11 coating composition of the present invention contains 100 parts by weight of a room temperature curable alkyd resin, 110 to 100 parts by weight of a short oil length alkyd resin or acrylic resin, and 1 to 5011 parts of an amino resin. It is characterized by containing.

In this composition, predetermined amounts of a short oil length alkyd resin, an acrylic resin, and an amino resin, which have a quick crosslinking reaction, are added to a room temperature curing alkyd resin (M polymerization type). Therefore, the present composition can be dried even at a low temperature of about 100° C. or lower, and the drying rate can be increased. Therefore, even if the composition is dried at a low temperature, the tack-free property after drying at a low temperature can be improved, and the initial hardness of the coating film is also excellent.

In addition, this composition is a room temperature curing alkyd mil! Since the composition mainly contains an alkyd resin, which is a short oil length alkyd resin, the present composition provides a coating film with excellent water resistance, corrosion resistance, and impact resistance.

[Example〕 The present invention will be explained below with reference to Examples.

Table 1 shows the compositions of the room temperature curable alkyd resin coating compositions in Examples 1 to 3 and Comparative Examples 1 to 2. Here, this coating composition is room temperature curing alkyd 11m.
In Comparative Example 2, a linseed oil-modified alkyd resin (oil length: 52%) was used, and in the other cases, tall oil-modified alkyd rMffit (oil length: 51%) was used.

Carbon black was used as the coloring pigment, cobalt naphthenate was used as the metal dryer, calcium carbonate was used as the extender pigment, and toluene was used as the solvent. Furthermore, as the metal chelate compounds blended in Comparative Example 3, ethyl acetoacetate and aluminum diisopropylate were used. The short oil length alkyd resin blended in Examples 1 to 3 was Betsucosol ET-330.
(Manufactured by Dainippon Ink and Chemicals Co., Ltd.) (Type of oil is tall oil, oil length is 33%.

), and as the methylolated melamine, Nikaratsuku M
W-12LF (manufactured by Sanwa Chemical Co., Ltd.) was used.

A test panel was prepared to evaluate the performance of the above coating composition. The conditions for making this test panel were that the panel was made of a degreased mild steel plate (SPCG-8D70X150X0.81
1) The tl1 strip 1 was prepared using the FSF L/- method, and the drying conditions were as follows: After setting for 5 minutes, drying was carried out in a hot air dryer at 90°C for 20 minutes, and the film thickness was 20 μm.

The tack-free property and corrosion resistance of the coating film created by the above method,
Performance evaluation of water resistance and impact resistance was performed and the results were evaluated in the first stage.
Shown in the table. Here, the evaluation of tack-free property is 90℃
The test was conducted based on the stickiness immediately after removal for 0 minutes. In Table 1, ◎ means no stickiness, O means the film is soft but not sticky, O to Δ means there is some stickiness, and X means stickiness. Yes, it means. The corrosion resistance was evaluated using a salt spray tester, and O in Table 1 means 9611 indirect rust width of 3 mm or less. The water resistance test method was performed by immersion in pure water at 40°C. In Table 1, ◎ means no change, O means whitening but no blisters, Δ~O means some 7 lister generation, and X~
Δ means 1/4 or less of the occurrence of blisters, and × means the occurrence of blister foam over the entire surface. The impact resistance was evaluated using a DuPont impact tester, and O in Table 1 was 5.
00QX30cm passed, O is 50C1x20cm
Passed, and △ means passed 500ax10cm.

Table 1 shows the tack-free property when the amount of short oil length alkyd resin is 10 to 100 parts by weight and the amount of methylolated melamine is 1 to 1 C1ffi parts (Examples 1 to 3) The tack-free property was improved compared to Comparative Example 1 and Comparative Example 2 in which these were not added. Furthermore, in Examples 1 and 2, when the amounts of the short oil length alkyd resin were 10 parts by weight and 50 parts by weight, respectively, and the amounts of methylolated melamine were 111 parts and 5 parts by weight, respectively, the tack-free property was improved. is extremely good. Furthermore, when the short oil length alkyd resin is 10 to 100 parts by weight and the methylolated melamine is 1 to 10 parts by weight (Examples 1 to 3), not only tack-free properties but also water resistance and impact resistance are improved due to the short oil length. It is superior to cases in which no alkyd resin and methylolated melamine resin are blended (Comparative Examples 1 to 3), and the corrosion resistance is equivalent.

From the above, in the case of Examples 1 to 3, the amount of the short oil length alkyd resin is 10 to 100 parts by weight and the amount of methylolated melamine is 1 to 10 parts by weight per 100 parts by weight of the room temperature curing alkyd resin. In terms of weight, tack-free properties could be improved without impairing corrosion resistance, water resistance, and impact resistance.

Patent applicant Aisin Kako Co., Ltd. agent
Patent attorney Hirodo Okawa Patent attorney Akio Maruyama Procedural amendment (voluntary) 1. Indication of the case Patent Application No. 246697 filed in 1985 2. Name of the invention Alkyd resin coating composition 3. Person making the amendment Relationship to the case Patent application Aisin Kako Co., Ltd. Kodama Pill, 1141-1 Okawagahara, Iino, Fujioka-machi, Nishikamo-gun, Aichi Prefecture (Tel: 052-583-9720) 5.1+
Ii Column 6 of the detailed description of the invention in the correct subject specification, Column 6 of the contents of the amendment (1) In the 9th line of page 3 of the specification, the phrase "to denaturation" has been changed to "of denatured oil." I will correct it.

(2) On the 9th line of page 4 of the specification, delete the word ``breath'' that says ``quick-drying oil.''

(3) In the 15th line of page 4 of the specification, the phrase "condensation of F-anamine, etc. with formalin" will be corrected to "condensation of anamine, etc. with formalin."

(4) Insert r-J between "su" and "gender" in the 12th line of page 5 of Meisho M, which says "tack-free properties, etc."

(5) Delete the word "therefore" on the 18th line of page 5 of the specification.

(6) The words "end-linked bridge" on the 3rd and 8th lines of page 6 of the specification will be corrected to "uncross-linked."

(7) In the 20th line of page 7 of the specification, the word "♀" will be corrected to "fast".

(8) Delete "Acetate and J" on the 5th line of page 10 of Akira 111m.

(9) In the 18th line of page 10 of the specification, the words "dry" should be corrected to "dry."

(10) AkimaI) On page 10, line 19, correct the phrase ``Aru.'' to ``Aru.''.

Claims (5)

[Claims] (1) 100 parts by weight of room temperature curing alkyd resin, 10 to 100 parts by weight of short oil length alkyd resin or acrylic resin,
and 1 to 50 parts by weight of an amino resin. (2) Room temperature curing alkyd resin is phenolic resin,
The alkyd resin coating composition according to claim 1, which is modified with an epoxy resin, an acrylic resin, or a urethane resin. (3) The alkyd resin coating composition according to claim 1, wherein the short oil length alkyd resin is blended in an amount of 10 to 50 parts by weight based on 100 parts by weight of the room temperature curable alkyd resin. (4) The alkyd resin coating composition according to claim 1, wherein the amino resin is a methylolated melamine, which is a low-temperature crosslinking type melamine, a methylolated product of urea, or a methylolated product of benzoguanamine. (5) The alkyd resin coating composition according to claim 1, wherein the amino resin is blended in an amount of 3 to 20 parts by weight based on 100 parts by weight of the short oil length alkyd resin or acrylic resin.