KR20160105105A - Alkyd Resin Composition for Natural Drying Upper Coating Paint and Manufacture Method of The Same - Google Patents

Abstract

The present invention provides an alkyd resin composition for a natural drying-type top coating paint, which has excellent drying film state, can reduce production cost, and can stabilize product price. In addition, the alkyd resin composition for a natural drying-type top coating paint comprises: 15 to 25 wt% of waste cooking soybean oil; 13 to 23 wt% of polybasic acid; 15 to 22 wt% of polyhydric alcohol; 30 to 45 wt% of an organic solvent; and 0.05 to 0.5 wt% of a catalyst.

Description

Technical Field [0001] The present invention relates to an alkyd resin composition for natural drying top paints,

The present invention relates to an alkyd resin composition for a natural-drying type topcoat paint and a method for producing the same, and more particularly, to an alkyd resin composition for a natural-drying topcoat paint which is excellent in dry film condition, And a manufacturing method thereof.

Generally, a paint is a generic name of a fluid material that is coated on the surface of a solid material to form a solid film to protect and beautifulize the surface of the object.

As a constituent component of the paint, various additives such as a vehicle as a main component of a coating film as a main component of the paint, an additive to be added to a main part in a small amount to improve various properties such as dispersion, drying and curing of the paint, And solvents that are used to make the paint element easier to paint.

The paint becomes a transparent paint when the pigment is not added, and becomes the coloring paint when the pigment is added.

The above-mentioned paints can be classified into natural resin paints, synthetic resin paints, water-based paints and other paints according to the main components.

The synthetic resin paints have the largest number of kinds in the paints, and new synthetic paints continue to emerge as the synthetic resin chemistry advances.

One of widely used synthetic resin paints is alkyd resin paints.

Patent Publication No. 0576137 and No. 1405350 disclose techniques for an alkyd resin composition and an alkyd resin paint.

As disclosed in the aforementioned Japanese Patent No. 0576137 and Japanese Patent Publication No. 1405350, soybean fatty acid, glycerin, phthalic anhydride, pentaerythritol and the like are used as the composition of the alkyd resin.

However, since the price of soybean fatty acid, phthalic acid anhydride, pentaerythritol, etc. is gradually increasing, the conventional alkyd resin composition or alkyd resin paint has a problem that the manufacturing cost is difficult to lower and the product price becomes unstable due to unstable price of raw materials .

Therefore, there is a need for research and development of an alkyd resin which can reduce the manufacturing cost and enable production and supply of the product at a stable price.

It is an object of the present invention to provide a natural vegetable oil which can reduce the manufacturing cost and stabilize the price by using waste soybean oil as one of constituent elements of the alkyd resin, And an object of the present invention is to provide an alkyd resin composition for a top coat paint and a method for producing the same.

The alkyd resin composition for natural-drying top paints proposed by the present invention comprises soybean oil for waste, polybasic acid, polyhydric alcohol, organic solvent and catalyst.

About 15 to 25% by weight of the waste edible soybean oil is used.

When the waste soybean oil is used in an excessively large amount, the dried coating film of the paint becomes a soft type and the scratch resistance of the dry film becomes poor. When the amount is too small, it is difficult to reduce the cost.

The polybasic acid is used in an amount of about 13 to 23% by weight.

As the polybasic acid, phthalic anhydride, maleic anhydride, benzoic acid and the like are used.

12 to 22 wt% of phthalic anhydride, 0.05 to 0.3 wt% of maleic anhydride, and 0.3 to 1 wt% of benzoic acid are used, respectively.

In the above, maleic anhydride or benzoic acid may not be used.

The polyhydric alcohol is used in an amount of about 15 to 22% by weight.

The polyhydric alcohol uses glycerin.

The glycerin is used in an amount of about 15 to 22% by weight.

The organic solvent is used in an amount of about 30 to 45% by weight.

As the organic solvent, xylene is used.

The catalyst is used in an amount of about 0.05 to 0.5% by weight.

As the catalyst, caustic soda is used.

The present invention also provides a process for producing alkyd resin for natural-drying type paints, comprising the steps of: a first reaction at a temperature of 245 to 255 ° C by mixing wasted soybean oil, polyhydric alcohol and a catalyst; Adding a polybasic acid and then conducting a second reaction at 210 to 240 ° C; and adding an organic solvent to the product produced by the second reaction and diluting the product.

About 15 to 30% by weight of the waste soybean oil is used.

In the first reaction step, about 15 to 22% by weight of glycerin is used as the polyhydric alcohol, and about 0.05 to 0.5% by weight of caustic soda is used as the catalyst.

In the second reaction step, 12 to 22% by weight of phthalic anhydride, 0.05 to 0.3% by weight of maleic anhydride, and 0.3 to 1% by weight of benzoic acid are used as the polybasic acid.

In the diluting step, about 30 to 45% by weight of xylene is used as the organic solvent.

The diluting step dilutes the organic solvent at approximately 120 to 140 ° C.

According to the alkyd resin composition for a natural drying type top coating paint of the present invention and the preparation method thereof, since the waste edible soybean oil is used as a constituent, it is possible to replace the entire amount of soybean fatty acid and a portion of glycerin, It is possible to increase the usability of the waste cooking oil and to stabilize the supply price of the product.

Next, preferred embodiments of the alkyd resin composition for a naturally dried top coat paint according to the present invention will be described in detail with reference to the drawings.

In the following description, the same reference numerals are used for the same technical elements, and detailed descriptions for avoiding redundant description are omitted.

The embodiments described below are intended to illustrate the preferred embodiments of the present invention in an effective manner and should not be construed to limit the scope of the present invention.

[Example 1]

19.9% by weight of waste edible soybean oil, 18.1% by weight of glycerin and 0.3% by weight of caustic soda were placed in a four-necked flask and the temperature was gradually raised to 250 ° C. After 30 minutes, it was confirmed by the methanol test that the mixture became monoglyceride, , 25% by weight of phthalic anhydride, 0.2% by weight of maleic anhydride, and 0.6% by weight of benzoic acid were slowly added to the reaction mixture to raise the temperature to 230 ° C. and the diluted viscosity of xylene was 50% In the following, 35.7% by weight of xylene was added and diluted to obtain an alkyd resin of Example 1 of the present invention.

The test results of the non-volatile fraction of 60.2, the acid value of 6.5 and the viscosity of Z5- were obtained as a result of the test of the alkyd resin of Example 1 of the present invention produced by the above reaction according to the paint test method (KSM5000).

[Example 2]

22.8% by weight of waste edible soybean oil, 17.6% by weight of glycerin and 0.1% by weight of caustic soda were placed in a four-necked flask, and the temperature was gradually raised to 250 ° C. After 30 minutes, it was confirmed by the methanol test to be monoglyceride, , 22.7% by weight of phthalic anhydride, 0.2% by weight of maleic anhydride and 0.6% by weight of benzoic acid were gradually added and reacted to 230 ° C, and the dilution viscosity of xylene was 50% In the following, 35.7% by weight of xylene was added and diluted to obtain an alkyd resin of Example 2 of the present invention.

The alkyd resin of Example 2 of the present invention prepared by the above reaction was tested according to the coating test method (KSM5000). As a result, test results of nonvolatile content of 60.1, acid value of 6.8, and viscosity of Z4 + were obtained.

[Comparative Example 1]

The flask was charged with 19% by weight of soybean fatty acid, 17.2% by weight of glycerin, 0.2% by weight of maleic anhydride, 25.4% by weight of phthalic anhydride and 0.6% by weight of benzoic acid, slowly raising the temperature to 210.degree. The mixture was cooled until the viscosity became Z3 +, and 37.6 wt% of xylene was added at 140 DEG C or lower and diluted to obtain an alkyd resin of Comparative Example 1 of the present invention.

Then, the alkyd resin of Comparative Example 1 of the present invention prepared by the above reaction was tested according to the coating test method (KSM5000), and the test results of nonvolatile content of 60.5, acid value of 6.8, and viscosity of Z5- were obtained.

In order to investigate the coating properties after the paints were prepared using the alkyd resins obtained in the respective Examples and Comparative Examples, the alkyd resins obtained from the Examples and Comparative Examples were used to prepare the alkyd resin paints as shown in Table 1 below Respectively.

Raw material name Amount of blending The resins of the Examples and Comparative Examples 435 White pigment 147 Blue pigment 0.4 Dispersant 0.4 Defoamer 10 Nitrocellulose 240 Leveling agent One solvent 166.2 Sum 1000

In order to investigate the characteristics of the paints shown in Table 1, coatings using an alkyd resin prepared in the test steel were coated at a thickness of 20 to 60 microns, and dried at room temperature to obtain a test coat.

The properties of the irradiated coating films are shown in Table 2 below, and the respective properties in Table 2 were measured by the following methods.

1. The appearance of the dried coating film was determined by comprehensively determining the observation results of the surface of the completely dried coating film, leveling property, color separation, pinhole, creta ring and the like.

2. The viscosity was measured with a KU viscometer at 25 ° C.

3. Set-to-touch was measured at 20 ° C. When the fingertip was lightly put on, it was judged that it was tacky if there was stickiness but the paint did not stick to fingertips.

4. Dry-Hard is measured at 20 ° C, and the test plate is held between the thumb and the cuff. The coating is placed close to the thumb, press hard (not twisted), peel it off, and gently rub it with a soft cloth. At this time, if there was no fingerprints on the coated film, it was assumed that it was solidified.

Test Items  Specification (KSM5000)  Example 1  Example 2  Comparative Example 1 Dry film appearance  Good  Good  Good Viscosity (KU) 85 ± 1  85.2 85.4 84.3 Dry touch Within 10 minutes  9 minutes 9 minutes 10 seconds 8 minutes 50 seconds Solidification drying in 1 hour  55 minutes 52 minutes 51 minutes

As can be seen from the above Table 2, all of Examples 1 and 2 and Comparative Example 1 satisfied the dry film condition, and the viscosity, touch dry time, and solidification dry time satisfied the specification (KSM5000).

Claims (3)

An alkyd resin composition for a naturally dried top coat paint comprising 15 to 25% by weight of waste edible soybean oil, 13 to 23% by weight of a polybasic acid, 15 to 22% by weight of a polyhydric alcohol, 30 to 45% by weight of an organic solvent and 0.05 to 0.5% . The method according to claim 1,
As the polybasic acid, phthalic anhydride, maleic anhydride and benzoic acid are used,
As the polyhydric alcohol, glycerin is used,
As the organic solvent, xylene was used,
The alkyd resin composition for a natural-drying topcoat using caustic soda as the catalyst. A step of subjecting the soybean oil, the polyhydric alcohol and the catalyst to a first reaction at a temperature of 230 to 260 ° C,
Adding a polybasic acid and a polyhydric alcohol to the product produced by the first reaction and then carrying out a second reaction at 120 to 180 ° C,
And adding an organic solvent to the product produced by the secondary reaction and diluting the organic solvent.