KR20020048663A - A manufacturing method of modified alkyd resin and a wood seeling paint using the alkyd resin - Google Patents

Abstract

PURPOSE: Provided are a method for producing modified alkyd resin which can be dried in a short time and form sufficient cross linkages and thereby can effectively inhibit coating obstacles such as color blurring, curing failure, and softening of coating, being useful for coating for wood sealer, and a coating for wood sealer containing the modified alkyd resin produced thereby. CONSTITUTION: In the method, the modified alkyd resins is produced by adding 70 to 400 parts by weight of a monomer mixture comprising 40 to 70 parts by weight of vinyl monomer, 20 to 50 parts by weight of alkylacrylate monomer, 5 to 25 parts by weight of hydroxy containing monomer along with solvents and other additives to 100 parts by weight of alkyd resin and reacting the resulting mixture by a conventional addition reaction. The alkyd resin contains 20 to 40 wt% of whey and its hydroxy content is 4 to 7 wt%.

Description

A manufacturing method of modified alkyd resin and a wood seeling paint using the alkyd resin

The present invention relates to a method for preparing a fast-drying modified alkyd resin having a true anti-blocking effect, and to a wood sila paint containing a modified alkyd resin prepared by the method, and more particularly, to a styrene-modified alkyd resin composition having a hydroxyl activity. Method of preparing styrene-modified alkyd resin which effectively prevents coating disorders such as color bleeding, poor curing, and softening of coating film, since drying is fast and sufficient crosslinking is achieved by preparing paints. It is related with the coating material for wood sila containing modified alkyd resin manufactured by the manufacturing method.

General wood coating process is possessed; Eye and coloring; Transparent coating; Sanding seal coating; grinding; Midway paint; And a top coat.

At this time, the jinjin occurs in the possession process during the painting process, the color bleeding occurs during the coloring due to the jinjin, and in addition to the poor adhesion state of the coating film in the painting process after coloring, as well as the temperature rise of the coating material The flowability of the lumber in the wood is increased, thus causing the problem that the ridge is leaked to the surface through the coating film. In addition, problems such as discoloration of the coating material due to thickening of the coating and softening of the coating film and thickening of the wood gin caused by the movement of terpene oil, poor euvanicity, unsaturated polyester ester, and upaint.

Due to the above problems it is common to paint by blocking or removing the jinjin during painting. As a method of blocking the wood gin, a method of removing using a solvent, a method of removing by drying artificially, a method of extracting with alkali, a method of blocking by woodsila, etc. are used.

Among the above-mentioned methods, in particular, a method of blocking by wood silas, which is simple in processing and easy to cut off, is mainly used. As the wood sila, paints such as fibrin, acid curing amino alkyd, unsaturated polyester, polyurethane, and UV curing are used. In particular, a polyol component having an OH group and a polyisocyanate having an NCO group react to crosslink. Polyurethane-based two-component paints that form and harden are mainly used. Since the polyurethane-based paint chemically bonds with cellulose of wood, it has excellent adhesion and flexibility of the cured coating film, as well as excellent cracking resistance, and also has excellent chemical properties such as water resistance and chemical resistance and excellent gloss. Because.

However, when the polyurethane-based wood sill is coated on a lot of oil (wood, ebony, rose neck, teak, etc.), there was a problem that it is difficult to block the gin leaking from the wood.

Accordingly, the present inventors can shorten the cure time by shortening the curing time when mixing the main agent and the polyisocyanate curing agent using a fast-drying type of styrene-modified alkyd resin while researching woodsila to compensate for the above disadvantages. The present invention was completed.

Accordingly, an object of the present invention is to shorten the drying time to the maximum to increase the effect of true blocking, as well as to produce a modified alkyd resin having excellent physical properties of the coating film, and wood sila containing the modified alkyd resin prepared by the method. To provide a paint.

The present invention for achieving the above object

In the manufacturing method of the modified alkyd resin to make a modified alkyd resin by making an alkyd resin as an essential component and adding a monomer, a solvent and other additives to the alkyd resin and the monomer by a conventional method,

70 parts by weight of the vinyl monomer, 40 parts by weight to 70 parts by weight, 20 parts by weight to 50 parts by weight of the alkyl acrylate monomer, 5 parts by weight to 25 parts by weight of the hydroxyl group-containing monomer, 70 parts by weight based on 100 parts by weight of the alkyd resin. It can be achieved by providing a method for producing a modified alkyd resin, characterized in that addition to 400 parts by weight of addition reaction.

In the present invention, the modified alkyd resin is prepared by first reacting an alkyd resin and a monomer mixture.

In this case, the alkyd resin may be an alkyd resin prepared by a conventional production method using fatty acids, polybasic acids or acid anhydrides, and polyhydric alcohols as main ingredients. However, in the present invention, the alkyd resin was manufactured by condensation reaction over several hours by limiting the raw material and the mixing ratio and applying the solvent circulation method at a temperature of 200 ° C to 230 ° C in order to maximize the true blocking effect. In particular, the alkyd resin having a whey of 20 wt% to 40 wt% and a hydroxyl content of 4 wt% to 7 wt% was prepared by adjusting the equivalent ratio of alcohol to acid to 1 to 1.5, followed by condensation reaction.

When the whey exceeds 40wt%, the Tg of the modified alkyd resin manufactured using the alkyd resin is lowered, resulting in a low dryness and a low film hardness.If the whey is less than 20wt%, the coating is too hard to be broken. Since there is a problem, it is desirable to have whey within the above range.

In addition, when the hydroxyl content exceeds 7wt%, there is a problem that the coating film is too hard to be broken when the modified alkyd resin prepared by using the alkyd resin is applied to the paint, and when the hydroxyl content is less than 4wt%, crosslinking is insufficient. It is preferable to have a hydroxyl content in the above range because there is a problem that the true blocking effect is lowered.

The fatty acids that can be used in the manufacture of alkyd resins include fatty acids such as linseed oil, soybean oil, tall oil, rice bran oil, dehydrated castor oil, and as saturated polybasic acids, phthalic anhydride, phthalic acid, tetrahydrophthalic anhydride, isophthalic acid, terephthalic acid, and adipic acid. What is selected from pinic acid etc. can be used, A thing selected from maleic anhydride, maleic acid, a fumaric acid etc. can be used as unsaturated dibasic acid. As the polyhydric alcohols, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butanediol, 1,6-hexanediol, neopentyl glycol, glycerin, diglycerol, monopentaerythritol, dipentaerythritol and the like are selected. Can be used.

In the synthesis of alkyd resin of the present invention, one of the fatty acids of the above-mentioned fats and oils, one or two or more of saturated polybasic acids is used in combination, and unsaturated dibasic acid is used in small amount according to the unsaturated degree of fatty acids to be used, and monobasic acid is monobasic acid for molecular weight control. A small amount of was used.

The polyhydric alcohol is used by mixing one or two or more selected, wherein when using a dihydric alcohol and trihydric or tetrahydric alcohol together it is possible to manufacture a resin having a fast drying and high hardness. In addition, it is easier to use a tin compound such as dibutyl tin oxide as a reaction catalyst to facilitate the progress of the reaction.

When the addition of the alkyd resin prepared as described above and the monomer according to the present invention to produce a modified alkyd resin according to the present invention, wherein the monomer is added to 70 parts by weight to 400 parts by weight based on 100 parts by weight of the alkyd resin. When the amount of the monomer added is less than 70 parts by weight, pigment dispersibility, coating workability, durability is good, but the drying rate of the coating film is slow, there is a problem that the barrier of the dust is reduced, when the addition amount of the monomer exceeds 400 parts by weight pot life It is shortened and hardening proceeds quickly, but there is an advantage in that the true barrier strength of the wood is improved, but there is a problem that the dry coating is harder than necessary. Therefore, it is preferable to mix an alkyd resin and a monomer in the said range, and it is especially preferable to add 100 weight part-230 weight part of monomers with respect to 100 weight part of alkyd resins.

In the present invention, a mixture of 40 to 70 parts by weight of vinyl monomer, 20 to 50 parts by weight of alkyl acrylate monomer and 5 to 25 parts by weight of hydroxyl group-containing monomer was used as the monomer.

The vinyl monomer is added to improve coating properties such as gloss, water resistance, and chemical resistance, and when the additive is less than 40 parts by weight, the sufficient effect is not seen, and when the amount exceeds 70 parts by weight, the coating is more than necessary. It is preferable that the vinyl monomer is added within the above range because it is hard and brittle, and there is a problem in that the transparency of the resin is poor or the appearance of the resin decreases during storage and sedimentation and sedimentation occur.

It is preferable to use a vinyl monomer selected from styrene, vinyl toluene and the like.

In addition, the alkyl acrylate monomer is added in order to improve the weather resistance and the hardness and chemical resistance of the coating film after curing, and when the added amount is less than 20 parts by weight, the sufficient effect is not seen. It is preferable to add an alkyl acrylate monomer within the above range because the compatibility with the polyisocyanate used as is poor and the appearance is haze (Haze) problem.

As said acryl-type monomer, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) At least one compound selected from acrylates and the like can be used.

In addition, the hydroxyl group-containing alkylacryl monomer is added to increase the crosslinking density when used in combination with polyisocyanate used as a curing agent of the paint to enhance the true barrier property. When the amount is less than 5 parts by weight, curing drying of the coating film is slowed and the crosslinking density is increased. Less, there is a problem that the barrier force of the bark is lowered, if the addition amount exceeds 25 parts by weight, the crosslinking density is too high when used in combination with polyisocyanate, the melt viscosity is already high before the film is formed, there is a problem that the appearance of the film is poor and easily broken It is preferable to add a hydroxyl-containing alkylacryl monomer within the range.

As the hydroxyl group-containing monomer, at least one compound selected from 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, hydroxy butyl (meth) acrylate, and the like may be used.

In addition, in the present invention, a small amount of acrylic acids such as acrylic acid and methacrylic acid may be added in order to improve adhesive strength with other additives in the process of preparing the modified alkyd resin.

In addition to the other additives, a polymerization initiator selected from peroxide-based benzoyl peroxide, tertiary butyl peroxide, tertiary butyl perbenzoate and azo azobisbutylnitrile is added, wherein the amount of the polymerization initiator is added to the monomer. It is preferable to use 1.0 weight part-5.0 weight part with respect to the addition amount.

In addition, as a solvent, it is preferable to mix and use hydrocarbon type, such as xylene and toluene, ester type, such as butyl acetate, and ethyl acetate, and kentones, such as methyl ethyl ketone and methyl isobutyl ketone, and the addition amount is modified It is preferable to add 40 weight part-100 weight part with respect to 100 weight part of alkyd resin solid content.

As described above, a modified alkyd resin may be prepared by adding an monomer, a solvent, and other additives to the alkyd resin to further react the alkyd resin with the monomer in a conventional manner. The production method includes a total amount injection method and a monomer dropping method, but in the present invention, the alkyd resin and a part of the solvent are first introduced into the reactor, the temperature of the contents is adjusted to 130 ° C. to 150 ° C., and the monomer mixture containing the polymerization initiator is prepared. In order to increase the polymerization rate and sufficiently complete the reaction while dropping over 2 hours to 3 hours, an additional polymerization initiator was added, the reaction was maintained, and the reaction was terminated by diluting with a solvent to obtain a modified alkyd resin.

The modified alkyd resin is Tg is changed according to the composition of the monomer at the time of manufacture, the most preferable Tg range is 30 ℃ to 100 ℃ range, in particular in order to prevent the breakage of the coating easily, to improve the flexibility and to increase the anti-shock effect It is preferable to make it have a range of 60 to 90 degreeC.

In addition, in the present invention, the modified alkyd resin composition prepared according to the above production method may be applied as a polyurethane two-component coating. In this case, the polyurethane two-component paint is 30 parts by weight to 60 parts by weight of modified alkyd resin prepared by the present invention, 5 parts by weight to 10 parts by weight of curing accelerator, 0.1 parts by weight to 1 part by weight of antifoaming agent, and 30 parts by weight to 60 parts by weight of solvent. It is composed of parts by weight, the curing agent provides a paint for wood sila consisting of 50 parts by weight to 80 parts by weight of polyisocyanate and 20 to 50 parts by weight of a solvent.

Woodsila paint prepared as described above has the advantage of effectively blocking the coating disorders such as color bleeding, poor hardening and softening of the coating film caused by wood gin when the drying is fast and sufficient crosslinking.

Hereinafter, the present invention will be described in more detail with reference to the following examples, which are only presented to aid the understanding of the present invention, but the present invention is not limited thereto.

<Manufacture example 1>

Preparation of Alkyd Resin

170 parts by weight of soybean oil fatty acid, 30 parts by weight benzoic acid, 240 parts by weight phthalic anhydride, 60 parts by weight ethylene glycol, 140 parts by weight pentaerythritol, 30 parts by weight xylene in a four-necked flask equipped with a stirrer, a thermometer, a condenser and a water separator. After the mixture was heated to 210 ° C. and dehydrated for 3 hours, the first reaction was terminated when the acid value was 15 or less. 20 parts by weight of maleic anhydride was added thereto and reacted at 150 ° C. for 60 minutes. When the acid value was 30 or less, the reaction was terminated and 300 parts by weight of xylene was added and diluted. The whey was 29 wt% and the hydroxyl content was 4.0 wt%. Was prepared.

<Manufacture example 2>

Preparation of Alkyd Resin

170 parts by weight of soybean oil fatty acid, 30 parts by weight of benzoic acid, 230 parts by weight of phthalic anhydride, 70 parts by weight of ethylene glycol, 140 parts by weight of pentaerythritol, 0.2 parts by weight of dibutyl tin oxide, and then heated to 210 ° C. After the dehydration reaction for 3 hours, if the acid value is 15 or less, the first reaction is terminated. 20 parts by weight of maleic anhydride was added thereto and reacted at 150 ° C. for 60 minutes. When the acid value was 25 or less, the reaction was terminated. 300 parts by weight of xylene was diluted to dilute an alkyd resin solution having a whey content of 29 wt% and a hydroxyl content of 5.5 wt%. Prepared.

<Manufacture example 3>

Preparation of Alkyd Resin

90 parts by weight of soybean oil fatty acid, 30 parts by weight of benzoic acid, 230 parts by weight of phthalic anhydride, 60 parts by weight of ethylene glycol, 140 parts by weight of pentaerythritol, 0.2 parts by weight of dibutyl tin oxide, and then heated to 210 ° C. After the dehydration reaction for 3 hours, if the acid value is 12 or less, the first reaction is terminated. 20 parts by weight of maleic anhydride was added thereto and reacted at 150 ° C. for 60 minutes, and when the acid value was 25 or less, the reaction was terminated. 300 parts by weight of xylene was diluted to dilute, 18 wt% whey and an alkyd resin solution having a hydroxyl content of 6.2 wt%. Was prepared.

<Manufacture example 4>

Preparation of Alkyd Resin

250 parts by weight of soybean oil fatty acid, 20 parts by weight of benzoic acid, 180 parts by weight of phthalic anhydride, 50 parts by weight of ethylene glycol, 140 parts by weight of pentaerythritol, 0.2 parts by weight of dibutyl tin oxide, and then heated to 210 ° C. Dehydration for 3 hours to terminate the first reaction if the acid value is less than 12. 20 parts by weight of maleic anhydride was added thereto and reacted at 150 ° C. for 60 minutes. When the acid value was 25 or less, the reaction was terminated and 300 parts by weight of xylene was diluted. The alkyd resin solution having 42 wt% of whey and 5.0 wt% of hydroxyl group was used. Was prepared.

Production Example 5

Preparation of Alkyd Resin

180 parts by weight of soybean oil fatty acid, 20 parts by weight of benzoic acid, 240 parts by weight of phthalic anhydride, 70 parts by weight of ethylene glycol, 110 parts by weight of pentaerythritol, 0.2 parts by weight of dibutyl tin oxide, and then heated to 210 ° C. After the dehydration reaction for 3 hours, if the acid value is 15 or less, the first reaction is terminated. 20 parts by weight of maleic anhydride was added thereto and reacted at 150 ° C. for 60 minutes. When the acid value was 30 or less, the reaction was terminated and 300 parts by weight of xylene was added and diluted. The alkyd resin solution having 31 wt% of whey and 3.0 wt% of hydroxyl group was used. Was prepared.

<Manufacture example 6>

Preparation of Alkyd Resin

170 parts by weight of soybean oil fatty acid, 30 parts by weight of benzoic acid, 220 parts by weight of phthalic anhydride, 100 parts by weight of ethylene glycol, 150 parts by weight of pentaerythritol, and 0.2 parts by weight of dibutyl tin oxide were added to the same apparatus as Preparation Example 1, and the temperature was increased to 210 ° C. After dehydration for 3 hours, if the acid value is less than 10, the first reaction is terminated. 20 parts by weight of maleic anhydride was added thereto and reacted at 150 ° C. for 60 minutes. When the acid value was 20 or less, the reaction was terminated and 300 parts by weight of xylene was diluted to dilute the whey with 28 wt% and 8.7 wt% of hydroxyl group. Was prepared.

<Example 1>

250 parts by weight of alkyd resin prepared according to Preparation Example 1, 1 part by weight of butyl peroxide, 80 parts by weight of butyl acetate, and heated to 140 ° C., 220 parts by weight of styrene, 70 parts by weight of methyl methacrylate, and 2-ethyl A mixture of 30 parts by weight of hexyl acrylate, 60 parts by weight of 2-hydroxyethyl methacrylate, 5 parts by weight of methacrylic acid, 9 parts by weight of butyl peroxide and 40 parts by weight of butyl acetate is added dropwise over 3 hours. After dropping, a mixture of 1 part by weight of butyl peroxide and 10 parts by weight of butyl acetate was added thereto. After the reaction was completed, the mixture was diluted with 250 parts by weight of xylene and toluene butyl acetate mixed solvent (mixing ratio of 30: 30: 40wt%) to prepare a resin.

400 parts by weight of the modified alkyd resin prepared above, 1 part by weight of Vik-066 (BYK-066; Vik Corporation) as an antifoaming agent, 50 parts by weight of nitrocellulose as a curing accelerator, cellulose acetate butyrate (celluulose acetate) butyrate) and 540 parts by weight of a solvent in which toluene and methyl iso-butyl ketone (hereinafter referred to as MIBK) were mixed at a ratio of 5: 5 to prepare a main ingredient.Desmodur L-75 (Desmodur L) was used as a curing agent. 500 parts by weight of Bayer Co., Ltd.) and butyl acetate were respectively added and mixed to prepare a two-component wood sila paint composed of the main material and the curing agent.

The wood sila paint thus prepared was subjected to a touch drying time, a curing drying time, a pot life, workability, a cold heat repetition test, and an anti-shock test using the following method, and the results are shown in Table 1.

-Touch and curing drying time-

According to Test Method 2511 of KS M 5000, the main material and the curing agent were mixed 1: 1 and applied to the glass plate at a thickness of 75 μm. Then, when the fingertips were lightly applied to the coating film, it was sticky, but it took until it did not get on the fingertips. The drying time is measured, and the curing time is taken until the arms are perpendicular to the coating surface and twisted at an angle of 90 degrees while pressing with the thumb to the extent that the coating is not stretched or wrinkled.

-Housework time-

About 50 g of the paint mixed with the main agent and the hardener in a plastic container was poured into the plastic container, and the time taken until the surface was hardened when the surface of the coating film was pressed with a finger was measured.

- Workability -

In accordance with Test Method 2421 of KS M 5000, wood is coated with a brush or spray and tested for good spreadability.

◎: Smooth surface when spraying and brush painting.

(Circle): It is good in spray painting, but curvature occurs on the surface due to brush marks.

(Triangle | delta): Paint particle generate | occur | produces finely at the time of spray coating, and curvature occurs at the surface by brush mark at the time of brush coating.

X: Paint particles are generated during spray painting, and curvature is severely generated due to brush marks during brush painting.

-Cold Heat Repeat Test-

According to Test Method 4.10 of KS M 5307, test specimens are prepared by painting twice on the MDF plate at intervals of 24 hours so that the thickness of the dry coating film is 40 µm and leaving it for 7 days. This specimen is placed in a thermostat maintained at -20 ± 2 ° C for 1 hour, then taken out and left for 30 minutes in a 20 ° C room. After heating for 1 hour in a thermostat maintained at 80 ± 2 ℃ and taken out and left for 30 minutes in a room at 20 ℃. After repeating this operation several times, the crack and the distortion of a coating film were evaluated by the following method.

◎: Cracks or warping of the coating film occur after more than 6 repeated tests.

(Circle): The crack or distortion of a coating film appears at the time of 4 or more times and less than 6 times.

(Triangle | delta): The crack and the distortion of a coating film appear at the time of 2 or more times and less than 4 times.

X: Cracking and distortion of a coating film appear in one repeated test.

-True barrier test-

Paint the wood with ebony mixed with the main agent and hardener 1: 1 so that the thickness of the dry coating film is 40㎛ and dry it completely. Then, paint the colorant on the wood to see if the color is adhering to the wood when the colorant is adsorbed on the wood. Check it.

(Double-circle): Color bleeding did not generate | occur | produce throughout the coating film.

(Circle): Color bleeding phenomenon generate | occur | produced in less than 10% of the coating-film whole area.

(Triangle | delta): A color bleeding phenomenon generate | occur | produced in 10 to 30% of the whole film area.

X: The color bleeding phenomenon generate | occur | produced in 30% or more of the coating-film whole area.

<Example 2>

A styrene-modified alkyd resin was prepared in the same manner as in Example 1 except that the alkyd resin prepared according to Preparation Example 2 was used to prepare the modified alkyd resin, followed by preparing a two-component paint. Using the paint thus prepared, the same method as in Example 1 was carried out in the same manner as in Example 1, and the drying time, curing drying time, pot life, workability, cold heat repeat test, and true cut test were shown in Table 1 below.

<Examples 3 to 8>

When the modified alkyd resin was prepared, except that 2-hydroxyethyl methacrylate was added as a vinyl monomer styrene, an acryl-based methyl methacrylate, 2-ethylhexyl acrylate, and a hydroxyl group-containing monomer in the ratio shown in Table 1 below. Then, styrene-modified alkyd resin was prepared in the same manner as in Example 1, and then a two-part paint was prepared. Using the paint thus prepared, the same method as in Example 1 was carried out in the same manner as in Example 1, and the drying time, curing drying time, pot life, workability, cold heat repeat test, and true cut test were shown in Table 1 below.

Comparative Example 1

A styrene-modified alkyd resin was prepared in the same manner as in Example 1 except that the alkyd resin prepared according to Preparation Example 3 was used to prepare the modified alkyd resin, followed by preparing a two-component paint. Using the paint thus prepared, the same method as in Example 1 was carried out in the same manner as in Example 1, and the drying time, curing drying time, pot life, workability, cold heat repeat test, and true cut test were shown in Table 1 below.

Comparative Example 2

A styrene-modified alkyd resin was prepared in the same manner as in Example 1 except that the alkyd resin prepared according to Preparation Example 4 was used to prepare the modified alkyd resin, followed by preparing a two-component paint. Using the paint thus prepared, the same method as in Example 1 was carried out in the same manner as in Example 1, and the drying time, curing drying time, pot life, workability, cold heat repeat test, and true cut test were shown in Table 1 below.

Comparative Example 3

A styrene-modified alkyd resin was prepared in the same manner as in Example 1 except that the alkyd resin prepared according to Preparation Example 5 was used to prepare the modified alkyd resin. Using the paint thus prepared, the same method as in Example 1 was carried out in the same manner as in Example 1, and the drying time, curing drying time, pot life, workability, cold heat repeat test, and true cut test were shown in Table 1 below.

<Comparative Example 4>

A styrene-modified alkyd resin was prepared in the same manner as in Example 1 except that the alkyd resin prepared according to Preparation Example 6 was used to prepare the modified alkyd resin, and then a two-component coating material was prepared. Using the paint thus prepared, the same method as in Example 1 was carried out in the same manner as in Example 1, and the drying time, curing drying time, pot life, workability, cold heat repetition test and true cut test were shown in Table 1.

division Styrene addition amount (part by weight) MMA addition amount (part by weight) 2-EHA addition amount (weight part) 2-HEMA addition amount (part by weight) Dry touch time (minutes) Curing drying time (hours) Pot life (hours) Workability Cold heat repeat test True Blocking Test Example 1 220 70 30 60 8 0.8 2.5 ◎ ◎ ◎ Example 2 220 70 30 60 8 0.8 2.5 ◎ ◎ ◎ Example 3 50 70 30 60 12 1.2 3 × △ ○ Example 4 400 70 30 60 6 0.8 2 ○ × △ Example 5 220 20 30 60 9 One 2.5 ○ △ ○ Example 6 220 270 30 60 6 0.8 2 × △ ○ Example 7 220 70 30 5 12 1.3 3.5 ◎ ◎ × Example 8 220 70 30 150 8 0.8 2 × × ◎ Comparative Example 1 220 70 30 60 6 0.8 2 △ △ ◎ Comparative Example 2 220 70 30 60 15 1.5 3.5 ◎ ◎ × Comparative Example 3 220 70 30 60 8 0.8 2.5 ○ ○ × Comparative Example 4 220 70 30 60 12 1.2 3.5 ○ × ○

As shown in Table 1, in the case of Examples 1 and 2 in which the amount of the whey and the hydroxyl group and the amount of the monomer were added within the scope of the present invention, the drying time, curing drying time and pot life were good, in particular, workability, It can be seen that the cold heat repetition test and the true blocking test show very good results.

However, in the case of Comparative Example 1 in which whey was less than the scope of the present invention, the dry touch time, the hardening dry time and the pot life were good, but showed poor results in workability and cold heat repetition test. In addition, in the case of Comparative Example 2 in which the whey exceeds the scope of the present invention, the touch drying time, the curing drying time, and the pot life were long, and also showed poor results in the true blocking test.

In addition, Comparative Example 3 in which the hydroxyl content was less than the scope of the present invention showed poor results in the true blocking test, and Comparative Example 4 in which the hydroxyl content was more than the scope of the present invention showed poor results in the cold heat repetition test. Indicated.

Similarly, in Examples 3 to 8 in which the amount of the monomer was added outside the scope of the present invention, it can be seen that the physical properties thereof were lower than those of Examples 1 to 2 performed in the preferred range of the present invention.

As described above, the present invention is a useful invention for providing a modified alkyd resin composition having excellent physical properties of a coating film and a wood sila paint containing the same, as well as enhancing the effect of true blocking by shortening the drying time to the maximum. Particularly, the paint composition for wood sila according to the present invention uses styrene-modified alkyd resin with hydroxyl activity, and thus, drying occurs quickly and sufficiently crosslinking, resulting in color bleeding, poor curing, and softening of the coating film caused by wood coating. It is useful in the production of paint barrier coatings for true-blocking wood sealers because it effectively blocks barriers.

Claims (4)

In the manufacturing method of the modified alkyd resin to make a modified alkyd resin by making an alkyd resin as an essential component and adding a monomer, a solvent and other additives to the alkyd resin and the monomer by a conventional method, 70 parts by weight of the vinyl monomer, 40 parts by weight to 70 parts by weight, 20 parts by weight to 50 parts by weight of the alkyl acrylate monomer, 5 parts by weight to 25 parts by weight of the hydroxyl group-containing monomer, 70 parts by weight based on 100 parts by weight of the alkyd resin. A method for producing a modified alkyd resin, characterized in that addition to 400 parts by weight of addition reaction. The method of claim 1, wherein the alkyd resin has a whey of 20 wt% to 40 wt% and a hydroxyl content of 4 wt% to 7 wt%. The vinyl monomer is selected from styrene, vinyl toluene and the like, and the acrylic monomer is methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl ( At least one compound selected from metha) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, and the like is used, and as the hydroxyl group-containing monomer, 2-hydroxyethyl (meth) acrylate, 2- A method for producing a modified alkyd resin, characterized in that at least one compound selected from hydroxypropyl (meth) acrylate, hydroxy butyl (meth) acrylate, and the like is used. In the paint for polyurethane two-component wood silas composed of a main ingredient having a modified alkyd resin as a main component and a curing agent having a polyisocyanate as its main component, the main ingredient is 30 parts by weight of a modified alkyd resin prepared by the method of claim 1. To 60 parts by weight, 5 parts to 10 parts by weight of a curing accelerator, 0.1 parts to 1 part by weight of antifoaming agent, 30 parts to 60 parts by weight of solvent, and a curing agent of 50 parts by weight to 80 parts by weight of polyisocyanate and 20 parts by weight of solvent. Woodsila paint, characterized in that consisting of 50 parts by weight.