JP3207108B2 - Aqueous universal surfacer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based universal surface coating applied to the surface of an object to be coated on various objects.
It's about facers .

[0002]

2. Description of the Related Art Heretofore, the finish of coating an object to be coated has been aimed at protecting the aesthetic appearance and the object to be coated. For this reason, in coating, the color tone, luster, pattern, physical and chemical durability of the appearance are emphasized. On the other hand, the object to be coated has a wide variety of types and surface conditions, adheres to all the objects to be coated, and has good appearance as described above and good protection of the object to be coated. Was difficult to maintain. Therefore, prior to finishing the coating on the object to be coated, a certain kind of undercoating material with excellent adhesion to the object to be coated and excellent surface smoothness of the object to be coated is applied, and the surface of such undercoating material is coated. A method of applying is considered. This method has an advantage that the coating can be finished without being affected by the type or surface condition of the object to be coated, and such an undercoat material is generally used. Such an undercoat material is called a sealer, a primer, a surfacer, or the like, and is an organic solvent solution of a one-component synthetic resin such as an acrylic resin, a vinyl chloride, or a rubber chloride, and a solvent-based two-component solution such as an epoxy resin or a urethane resin. What mainly consists of reaction hardening type resin etc. was used.

On the other hand, in recent years, for the purpose of protecting the global environment,
Efforts are being made to reduce the organic solvents that cause air pollution and odors. This trend is no exception in the paint and coating industries, and the actual situation is that the undercoat materials described above are also switching to aqueous. An aqueous synthetic resin emulsion is the basic technology of such aqueous conversion.

[0004] Such an aqueous synthetic resin emulsion is
High-molecular-weight synthetic resin particles are dispersed in an aqueous solvent by emulsion polymerization or the like.By evaporating water as a solvent, the synthetic resin particles come closer to each other, and eventually contact and fuse. It forms a film. Furthermore, glycidyl group and carboxyl group, hydrazide group and carbonyl group, as monomers of synthetic resin particles of this emulsion,
By including a monomer having a functional group that causes a cross-linking reaction such as an epoxy group and an amino group (hereinafter, referred to as a functional group monomer), the bond between the synthetic resin particles at the time of fusing is further strengthened and formed. Improving the durability of the film has also been performed.

[0005] With respect to such undercoat materials, there are various types of coating finish materials such as aqueous, solvent-based, elastic, and hard-based materials. However, due to the excellent durability and finish, solvent-based materials are still used. Currently, the ratio is high. As described above, an aqueous undercoat material, particularly a crosslinked emulsion containing a functional group monomer, forms a film by fusing and crosslinking synthetic resin particles. Depending on the paint finishing material, it is difficult to dissolve, and in the case of a new foundation of a building, the undercoating material is water-based and the coating finish is solvent-based in some cases.

[0006]

However, the conventional solvent-based and water-based undercoat materials have the following problems, respectively. In other words, in the case of an undercoat material using a solvent-based two-component reaction-curable resin or a cross-linkable emulsion, repainting when an old coating film that is dissolved by a solvent is present on the surface of the object to be coated, that is, during remodeling. If a solvent-based paint is used, the undercoat will not be dissolved by the solvent of the paint, but the solvent that has penetrated into the old coating will dissolve the old coating. A phenomenon in which the material film gets stuck and rises (hereinafter, referred to as a lifting phenomenon) has occurred. For example, as shown in FIG. 1, when the old coating is a one-component solvent type acrylic resin coating, after applying a two-component reaction curing type urethane resin coating on the surface thereof, when applying a solvent type coating finishing material, The one-component solvent-type acrylic resin coating is re-dissolved by the solvent, whereas the two-component reaction-curable urethane resin coating is difficult to dissolve in the solvent, so that it appears as a dip at the interface. .

Further, in the case of an undercoating material composed of a one-component synthetic resin organic solvent solution, the surface of the undercoating material itself is re-dissolved particularly when a solvent-based two-component reaction-curing type coating finish is used. One application of the coating material does not cause any particular problem, but in the case of re-coating after curing of the coating material (hereinafter referred to as recoating), the undercoat material itself is in the same state as the above-mentioned old coating film. And the first coating film of the finishing material caused a lifting phenomenon. For example, as shown in FIG. 2, when the old coating is a one-component solvent type acrylic resin coating, a one-component solvent type low molecular weight chlorinated polyolefin resin sealer is applied to the surface thereof, and then a solvent-based two-component reaction curing type. Even if the urethane resin paint is applied, the one-component solvent type acrylic resin coating film and the one-component solvent type low molecular weight chlorinated polyolefin resin sealer coating only re-dissolve in the solvent, respectively, and there is no particular problem. If the two-component reaction-curable urethane resin paint is completely cured and then the solvent-based two-component reaction-curable urethane resin paint is recoated, the one-component solvent-type low molecular weight chlorinated polyolefin resin coating may be redissolved. On the other hand, since the solvent-based two-component reaction-curable urethane resin coating film is difficult to dissolve in a solvent, the urethane resin coating film appears at the interface. Furthermore, in the case of an old coating film or a coating film having an elastic finish, the adhesion was insufficient and delamination occurred. In particular, in the case of an aqueous undercoat material, since the presence of a polar group is generally low on the surface of the formed coating film, and also in a solvent-based undercoat material, a coating film formed from a synthetic resin having no polar group. In this case, this tendency was remarkable. Therefore, the problem to be solved by the present invention is to select the type of the object to be coated, the old coating film on the surface of the object to be coated, and the finish of the coating material, while being a water-based undercoating material in line with the recent environmental protection trend. In addition, it does not cause lifting even in solvent-based paint finishing materials, and acts as an undercoating material that exhibits excellent adhesion to elastic coating finishes and old coatings, as well as tones that adjust unevenness on the surface of the workpiece.
It is to obtain a universal surfacer having a regulating effect .

[0008]

In order to solve such problems, the present inventors have conceived of mixing an aqueous synthetic resin emulsion having a specific monomer composition with a specific aqueous latex containing chlorine. The present invention has been completed. That is, the present invention provides: (A) It does not contain any other monomer having an alkyl acrylate and / or alkyl methacrylate and having a functional group that causes a crosslinking reaction (hereinafter, referred to as a functional group monomer), and its glass transition temperature (hereinafter, referred to as Tg). ) Is -20 ° C to 10 ° C, and the weight average molecular weight is 300
(B) vinyl chloride, vinylidene chloride, alkyl acrylate and / or alkyl methacrylate, not containing other functional group monomers, and vinyl chloride and vinylidene chloride. Of a vinylidene chloride-based aqueous latex having a weight average molecular weight of 30,000 to 200,000 and a solid content of (B) of 5 to 40 per 100 parts by weight of the solid content of (A). It was mixed so that the weight portion, and, with respect to the total solid weight, Ri chlorine content is 2.5 to 15.0 wt% der, distribution and (C) inorganic powder
In total, the pigment volume concentration (hereinafter referred to as PVC) 15 to
Aqueous universal surface characterized by being adjusted to 60%
Sir . 2. (A) an alkyl acrylate and / or an alkyl methacrylate, a hydroxyl group-containing monomer,
Either one or both of the carboxyl group-containing monomers,
A monomer containing 5% by weight or less and having a functional group that causes a crosslinking reaction (hereinafter, referred to as a functional group monomer)
, Its glass transition temperature (hereinafter referred to as Tg) is -20 ° C to 10 ° C, and its weight average molecular weight is 3000.
Aqueous synthetic resin emulsion characterized by being not less than 00, comprising (B) vinyl chloride, vinylidene chloride, alkyl acrylate and / or alkyl methacrylate, and either or both of a hydroxyl group-containing monomer and a carboxyl group-containing monomer. , A vinylidene chloride-based aqueous latex having a ratio of vinyl chloride to vinylidene chloride of 100: 20 to 100: 180 and a weight average molecular weight of 30,000 to 200,000 containing no more than 5% by weight of other functional group monomers. , 100 parts by weight of the solid content of (A), the solid content of (B) was mixed so as to be 5 to 40 parts by weight, and the chlorine amount was 2.
5 to 15.0% by weight of the aqueous resin composition,
Mixing the powdery material and adjusting the pigment volume concentration to 15-60%
Aqueous all-purpose surfacer characterized by being adjusted . 3.
1. The hydroxyl group-containing monomer is 2-hydroxyethyl methacrylate. Water described in
An all-purpose surfacer .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The aqueous synthetic resin emulsion (A) of the present invention (hereinafter referred to as the component (A)) contains an alkyl acrylate and / or an alkyl methacrylate as a constituent monomer. Here, as the alkyl acrylate, methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n-pentyl acrylate, isoamyl acrylate, n-hexyl acrylate, 2-methylpentyl acrylate, n-octyl acrylate, 2- Ethylhexyl acrylate, n-
Decyl acrylate, n-dodecyl acrylate, n-
One or more selected from octadecyl acrylate and the like, as alkyl methacrylate, methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, n-pentyl methacrylate, isoamyl methacrylate, n-hexyl methacrylate, 2-methyl One or more selected from pentyl methacrylate, n-octyl methacrylate, 2-ethylhexyl methacrylate, n-decyl methacrylate, n-dodecyl methacrylate, n-octadecyl methacrylate and the like can be used.

According to the present invention, the universal surfacer can be used even when an elastic coating film is present on the substrate itself or its surface.
To a sufficient functioning of the chromatography, the Tg
Is required to be −20 ° C. to 10 ° C., and particularly for such a purpose, it is desirable to contain 2-ethylhexyl acrylate. At this time, when Tg is lower than −20 ° C., when a hard material is used as a coating finishing material,
Cracks occur in the coating finish, and when the temperature is higher than 10 ° C., the object of the present invention is applied to an elastic object to be coated.
When using the universal surfacer resin composition, versatile
Cracks will occur in the surfacer coating. In addition, a known monomer such as styrene can be used as long as the effect of the present invention is not impaired.

Next, the component (A) in the present invention is characterized in that it does not contain a functional group monomer. Such a functional group monomer is conventionally used for improving the physical properties of a film formed from an aqueous synthetic resin emulsion. , Which has been actively used. In the present invention, it has been found that an aqueous synthetic resin emulsion containing such a functional group monomer has rather narrowed the suitability as an undercoat material. Such a functional group monomer includes a glycidyl group and a carboxyl group, a hydrazide group and a carbonyl group, an epoxy group and an amino group, a hydroxyl group and a carboxyl group, a tertiary amine-epichlorohydrin adduct that self-condenses, Weakly reactive isocyanates and amino groups,
Carboxyl group and aziridine group, self-condensing alkoxysilyl group, carboxyl group and carbodiimide group, acetoacetate group and ketimine group, ester group and amino group having hetero atom at α-position, etc., and improvement of stability of aqueous synthetic resin emulsion And the like used for this purpose.

However, since the reactivity between the carboxyl group and the hydroxyl group is not so high, it is permissible to contain either 5% by weight or less of either the hydroxyl group-containing monomer or the carboxyl group-containing monomer, or both.
Further, by containing these monomers, the sealing property of the solvent is improved. Examples of such a hydroxyl group-containing monomer include 2-hydroxyethyl acrylate, hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, and hydroxypropyl methacrylate, and examples of the carboxyl group-containing monomer include acrylic acid and methacrylic acid. Among them, 2-hydroxyethyl methacrylate is particularly preferred, since the surface of a film formed from an aqueous synthetic resin emulsion using the same can be made hydrophilic without relatively reducing water resistance.
There is an effect that the sealing property of the solvent is further improved.

The method for producing the component (A) can be carried out by emulsion polymerization or the like, which is a general method for producing an emulsion, and a film formed from the aqueous synthetic resin emulsion is formed by a solvent such as toluene. It is necessary to have a high molecular weight such that it is not easily dissolved.
Therefore, the weight average molecular weight is 300,000 or more. The weight average molecular weight in the present invention is GPC
(Gel permeation chromatograph) and converted to polystyrene.

Next, the vinylidene chloride-based aqueous latex (B) (hereinafter referred to as the component (B)) comprises vinyl chloride,
Except for using vinylidene chloride as a copolymerization monomer, the same copolymerization monomer as the component (A) described above is used, and the use of the same hydroxyl group-containing monomer and carboxyl group-containing monomer is permitted.

The method for producing the component (B) is also as follows:
As described above, it is possible to use a method such as emulsion polymerization. However, in consideration of the stability of the latex, it is preferable to perform seed polymerization in which only a copolymer monomer excluding vinyl chloride and vinylidene chloride is first polymerized as a seed polymer.

The molecular weight of the component (B) must be in the range of 30,000 to 200,000 in terms of weight average molecular weight. If the molecular weight is less than 30,000, the solvent resistance is insufficient. In particular, when a two-component reaction-curing coating material is used, the surface of the undercoat material itself is redissolved. Does not cause any particular problem, but in the case of recoating after curing of the coating material, the first coating film of the coating material causes a lifting phenomenon. When it is larger than 200,000, it is difficult to stably produce the component (B) by a general polymerization method.

The aqueous universal surfacer of the present invention comprises an aqueous resin composition comprising the above-mentioned components (A) and (B).
But is to use the object, the mixing ratio is 100 parts by weight of the solid content of the component (A), a solids content of 5 to 40 parts by weight of component (B). At this time, it is necessary that the amount of chlorine is 2.5 to 15.0% by weight based on the total weight of the solid content. By using such an amount of chlorine, an object to be coated having elasticity, and an old coating film on the surface of the object to be coated exhibiting excellent adhesion including an elastic coating film and a coating finish material having an elastic coating. It is. When the solid content of the component (B) is less than 5 parts by weight, the effect of adhesion is insufficient because the chlorine content is less than the above range, and the solid content of the component (B) is less than 40 parts by weight. When the amount is large, the chlorine amount exceeds the upper limit and discoloration due to chlorine occurs, and even when the chlorine amount is within the specified range, the relative ratio of the component (B) having a lower molecular weight as compared with the component (A). Is increased, and as a result, the sealing property of the solvent is reduced.

Here, in the component (B), the ratio of vinyl chloride to vinylidene chloride is 100: 20 to 100: 1.
80. This is because when the vinyl chloride content is less than 100: 180, the vinylidene chloride content is relatively large, and as a result, the Tg of the component (B) is high, and the water-based all-purpose of the present invention can be applied to an elastic substrate. This is because when a surfacer is used, cracks occur in the surfacer coating film. Further, when the amount of vinyl chloride is larger than 100: 20, the amount of vinylidene chloride is relatively small, and in the component (B), the amount of chlorine per unit weight is relatively small. For the aqueous resin composition (hereinafter, "resin composition for undercoat material"
In some cases, it may be referred to as ) In order to make the amount of chlorine contained in the whole solid content 2.5 to 15.0% by weight, the amount of component (B) increases. This causes an increase in the relative ratio of the component (B) having a lower molecular weight as compared with the component (A), and as a result, the sealing property of the solvent is reduced.

The above-mentioned aqueous resin composition is further blended with an inorganic powder to adjust the PVC to 15 to 60%, whereby an aqueous universal surfacer having an effect as an undercoat material is obtained.
It can be used as a key . Such an aqueous
The active surfacer has a base adjustment effect of smoothly adjusting unevenness on the surface of the object to be coated, in addition to good adhesion and difficulty of lifting.

Examples of such inorganic powders include heavy calcium carbonate, titanium oxide, kaolin, clay, clay, china clay, diatomaceous earth, talc, barite, precipitated barium sulfate, barium carbonate, silica sand, quartz powder, Wollastonite and the like. The aqueous resin composition is made of PVC
Is suitably adjusted in the range of 15 to 60%, whereby a wide range of universal surfacers from hard to elastic can be manufactured.

Further, when such a surfacer is used, the coating of the object to be coated, the old coating film on the surface of the object to be coated, and the type of coating finishing material, which are features of the present invention, are further added. This has the effect of smoothing out irregularities and subtle undulations on the surface of objects and the like. In addition, a new pattern can be formed by appropriately selecting a coating method.

[0022]

The aqueous universal surfacer of the present invention is a high molecular weight aqueous synthetic resin emulsion containing no functional group monomer, or containing only 5% by weight or less of either a hydroxyl group-containing monomer or a carboxy group-containing monomer or both. Is mixed with a vinylidene chloride aqueous latex containing no functional group monomer, or a hydroxyl group-containing monomer, a carboxyl group-containing monomer, or only 5% by weight or less of both. Adhesion to the surface of various coating materials and excellent adhesion to the water-based elastic finishing material that is easy to peel off, and the particles of the aqueous synthetic resin emulsion and the vinylidene chloride-based aqueous latex are in an appropriate distribution state. Is difficult to dissolve itself by solvent-based paint finishing materials. Be dissolved coated article surface, it is believed to form a coating film having a follow-up property to them.

[0023]

EXAMPLES (Example 1) A resin composition for an undercoat material was produced using the raw materials shown in Table 1 and the blending shown in Table 2. Using this resin composition for undercoating materials, the following tests were performed. As shown in Table 3, lifting resistance, recoating property, adhesion with a water-based elastic overcoating material, conformability to an elastic underlayer, storage stability In all cases, good results were shown.

(Test method) Lifting resistance test A one-component solvent type acrylic resin enamel "SK Acrylic Color" is mounted on a flexible board of 300 x 300 x 6 mm.
(Manufactured by SK Chemical Co., Ltd.) was applied by brush at a coating amount of 200 g / m2. Thereafter, it was dried and cured at room temperature for 5 hours, further brush-coated at a coating amount of 200 g / m2, and dried and cured at room temperature for 7 days. The resin composition for an undercoat material of Example 1 was applied to the coated surface of the coated plate thus prepared in an amount of 100 g /
After brush-coating at m2, the film was dried and cured at room temperature for 1 hour, further brush-coated at a coating amount of 100 g / m2, and dried and cured at room temperature for 24 hours. The test specimen thus prepared was coated with a solvent-based two-part reaction-curable urethane resin enamel “Urethane Color” (manufactured by SK Chemical Co., Ltd.) at an application amount of 150 g / m 2.
2 and dried and cured at room temperature for 2 hours, further brush-coated at a coating amount of 150 g / m2, cured at room temperature for 24 hours, and then visually observed the coated surface of the test specimen. At this time, evaluation was made as x when lifting occurred, and as ○ when lifting did not occur.

In the recoating property test, in which the evaluation was "good" in the lifting resistance test, after curing for one month, the solvent-based reaction-curable urethane resin enamel "Urethane Color" (manufactured by SK Chemical Co., Ltd.) Was brush-coated at a coating amount of 150 g / m 2, dried and cured at room temperature for 24 hours, and then the coated surface of the test specimen was visually observed. At this time, evaluation was made as x when lifting occurred, and as ○ when lifting did not occur.

Adhesion test with water-based elastic top coat A 300 × 300 × 6 mm flexible board was brush-coated with the resin composition for undercoat material of Example 1 at a coating amount of 100 g / m 2, and dried and cured at room temperature for 1 hour. Further, it was brush-coated at a coating amount of 100 g / m2 and dried and cured at room temperature for 24 hours. Then, an elastic acrylic resin emulsion-based waterproof exterior thin coating material "Elastic Topless Soft" (manufactured by SK Chemical Co., Ltd.) was applied to the undercoat material coating surface of the coated plate with a wool roller at an application amount of 800 g / m2. 24 at room temperature
Cured for hours. The test specimen prepared in this manner was heated at 50 ° C.
After being immersed in warm water for 24 hours, the surface was lifted and scratched with a fingernail, and it was visually observed whether or not the coating film of the coating material on the surface was peeled off. Grading was performed.

Follow-up test on elastic substrate The two 300 × 140 × 6 mm flexible boards are placed on the surface of a 300 × 300 × 6 mm flexible board at intervals of 20 mm, and then the 20 mm wide grooves are formed. Was filled with a one-component moisture-curable urethane-based caulking material "SK Elastic Coke" (manufactured by SK Chemicals Co., Ltd.), and the surface was squeezed with a spatula so as to be smooth, followed by drying and curing at room temperature for one day. Thereafter, the resin composition for the undercoating material of Example 1 was brush-coated on the entire surface including the surface of the flexible board and the caulking material at a coating amount of 100 g / m2, and after drying and curing at room temperature for 1 hour, the coating amount was further increased to 100 g / m2.
It was brush-coated with m2 and dried and cured at room temperature for 24 hours. The test specimen thus produced was subjected to a repeated heating / cooling test based on JIS A 6909 6.11, and the presence or absence of peeling, cracking, or swelling of the coating film was confirmed.

Storage stability test 500 ml of the resin composition for undercoating material of Example 1 was placed in a 700 ml cup,
After a lapse of 4 hours, the sample was visually inspected for any abnormality such as gelation.

[0029]

(Comparative Example 1) A resin composition for an undercoating material was produced using the raw materials shown in Table 1 with the composition shown in Table 2, and the same test as in Example 1 was carried out. Synthetic resin emulsion 2 is a functional group monomer (acrylamide)
As shown in Table 3, it was inferior in the lifting resistance, and because the chlorine group content was 0%, the adhesion to the water-based elastic overcoat and the adhesion to the elastic base were inferior.

(Comparative Example 2) A resin composition for an undercoating material was manufactured using the raw materials shown in Table 1 with the composition shown in Table 2, and the same test as in Example 1 was carried out. As shown in FIG. 3, although there was no problem in the lifting resistance and the recoating property, it was found that the coating film became hard and cracks occurred on the surface of the elastic base.

(Comparative Example 3) A resin composition for an undercoat material was produced using the raw materials shown in Table 1 in the composition shown in Table 2, and a test was conducted in the same manner as in Example 1. Since the vinylidene-based aqueous latex 2 contained a functional group monomer (acrylamide), it was found that the lifting resistance was poor as shown in Table 3, and that the coating film became hard and cracks occurred on the surface of the elastic base.

(Comparative Example 4) A resin composition for an undercoating material was produced using the raw materials shown in Table 1 with the composition shown in Table 2, and the same test as in Example 1 was carried out. Since the synthetic resin emulsion 2 and the vinylidene chloride aqueous latex 2 contained a functional group monomer (acrylamide), it was found that the lifting resistance was poor as shown in Table 3.

(Comparative Example 5) A resin composition for an undercoating material was produced using the raw materials shown in Table 1 with the composition shown in Table 2, and the same test as in Example 1 was carried out. Since the molecular weight of the vinylidene-based aqueous latex 3 is low, the solvent resistance is poor as a whole, and the first coating of the solvent-based two-pack reaction-curable urethane resin enamel does not cause any problem, but the recoating (recoating) after a long time has passed. In this case, it was found that the undercoat material coating itself was dissolved by the solvent, and the first solvent-based two-pack reaction-curable urethane resin coating film was lifted.

(Comparative Example 6) A resin composition for an undercoating material was produced using the raw materials shown in Table 1 with the composition shown in Table 2, and the same test as in Example 1 was carried out. Since the vinylidene chloride / vinylidene chloride ratio of the vinylidene-based aqueous latex 4 is out of the desirable range of the present invention and the amount of vinylidene chloride is small, the vinylidene chloride-based aqueous latex 4
The amount of chlorine in the aqueous synthetic resin emulsion 1 is much larger than the molecular weight of the aqueous synthetic resin emulsion 1 by increasing the amount of chlorine (%) relative to the total solid content within the range specified in the present invention. As a result of mixing,
As a whole, the solvent resistance is inferior, and as shown in Table 3, the first coating of the solvent-based two-pack reaction-curable urethane resin enamel does not cause any problem, but the solvent is not repainted after a long time. As a result, it was found that the undercoat material coating itself was dissolved, and the first solvent-based two-pack reaction-curable urethane resin enamel coating was lifted.

Comparative Example 7 A resin composition for an undercoat material was produced using the raw materials shown in Table 1 with the composition shown in Table 2, and a test was conducted in the same manner as in Example 1. Since the vinylidene chloride / vinylidene chloride ratio of the vinylidene-based aqueous latex 5 is out of the desirable range of the present invention, and the vinylidene chloride is large, the vinylidene chloride-based aqueous latex 5 is not stable, and as shown in Table 3, the storage stability as a whole is low. It turned out to be missing.

Example 4 160 parts by weight of a calcium carbonate powder having an average particle size of 3 μm was mixed and kneaded with the resin composition for an undercoating material of Example 1 to produce a white paste-like surfacer. This surfacer is 300x
JIS A 6909 on a 300 x 6 mm flexible board
Architectural finishing coating material Multilayer finishing coating material E, "Lenalac" (manufactured by SK Chemicals Co., Ltd.) was coated with an undercoating material of 150 g / m.
2. Blowing a ball at 1.5 kg / m 2 of the main material, and applying 350 g of a one-component solvent type acrylic resin enamel “SK Acrylic Color” (manufactured by SK Chemical Co., Ltd.) as a top coat
/ M2 was spray-coated at a coating amount of 1 kg / m2 so as to cover the balls so as to hide the balls, to form a smooth surface, and then dried and cured at room temperature for 24 hours. The test specimen prepared in this manner was spray-coated with a solvent-based two-part reaction-curable urethane resin enamel "Urethane Color" (manufactured by SK Chemical Co., Ltd.) at a coating amount of 150 g / m2, and dried and cured at room temperature for 2 hours. The coating was spray-coated at a coating amount of 150 g / m @ 2 and cured at room temperature for 24 hours. Thereafter, the coating surface of the test specimen was visually observed, but no problem such as lifting occurred and the coating was finished with a smooth coating surface. Furthermore, this test specimen was tested based on JIS A 6909 6.11 repetition test of heating and cooling, and peeling, cracking, blistering, discoloration and decrease in gloss of the coating film were not observed, and the coating film had excellent coating performance. It was confirmed that.

[0038]

[Table 1]

[0039]

[Table 2]

[0040]

[Table 3]

[0041]

The water-based universal surfacer of the present invention can be used for repainting in the case where an old coating film which can be dissolved by a solvent is present on the surface of an object to be coated, such as a conventional solvent-based or aqueous-based undercoating material. Even when a solvent-based coating material is used, the lifting phenomenon does not occur , and the lifting phenomenon does not occur even in the recoating when a solvent-based two-component reaction-curing coating material is used , and Coating
It has a base adjustment effect of smoothly adjusting unevenness on the surface of an object .
Furthermore, even in the case where the old coating film or the coating material having a coating finish has elasticity, adhesion is sufficient and delamination does not occur. Therefore, regardless of the type of coating material, the old coating film on the surface of the coating material, and the finish of the coating material, the water-based all-purpose undercoat material that can be used for all purposes is provided.
It is a surfacer .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a lifting phenomenon of a solvent-based two-part reaction-curable urethane resin paint on a one-part solvent-type acrylic resin coating film by a solvent-type coating finish material.

FIG. 2 is a cross-sectional view showing a lifting phenomenon when a low-molecular-weight chlorinated polyolefin is recoated with a solvent-based two-component reaction-curable urethane resin paint on a one-component solvent-type acrylic resin coating film.

[Explanation of symbols]

a Substrate b One-component solvent-type acrylic resin coating (old coating) c Solvent-based two-component reaction-curable urethane resin coating d d Solvent-type coating finishing material e Lifting phenomenon f Resolved by solvent g One-component solvent-type low molecular weight chlorinated polyolefin resin sealer coating h Solvent-based two-component reaction-curable urethane resin coating

Claims (3)

(57) [Claims] (1) It does not contain (A) an alkyl acrylate and / or an alkyl methacrylate and other monomers having a functional group which causes a cross-linking reaction (hereinafter referred to as “functional monomer”), and has a glass transition temperature ( Less than,
It is called Tg. ) Is -20 ° C to 10 ° C, and the weight average molecular weight is 300,000 or more. An aqueous synthetic resin emulsion comprising: (B) vinyl chloride, vinylidene chloride, alkyl acrylate and / or alkyl methacrylate; A vinylidene chloride-based aqueous latex containing no functional group monomer, a ratio of vinyl chloride to vinylidene chloride of 100: 20 to 100: 180, and a weight average molecular weight of 30,000 to 200,000 was added to 100 parts by weight of the solid content of (A). On the other hand, (B) was mixed so that the solid content was 5 to 40 parts by weight, and the amount of chlorine was 2.5 to 15.0% by weight based on the total weight of the solid content. Ah is, by blending (C) inorganic powder, a pigment volume concentration (hereinafter
Below, it is called PVC. ) It is noted that it was adjusted to 15-60%.
Aqueous all-purpose surfacer to mark . 2. A (A) containing an alkyl acrylate and / or an alkyl methacrylate, containing not more than 5% by weight of either or both of a hydroxyl group-containing monomer and a carboxyl group-containing monomer, and causing other crosslinking reaction. It does not contain a monomer having a functional group (hereinafter, referred to as a functional group monomer), and has a glass transition temperature (hereinafter, referred to as T).
g. ) Is -20 ° C to 10 ° C, and the weight average molecular weight is 3
An aqueous synthetic resin emulsion characterized by being not less than 00000, comprising (B) vinyl chloride, vinylidene chloride, alkyl acrylate and / or alkyl methacrylate, and either or both of a hydroxyl group-containing monomer and a carboxyl group-containing monomer. , A vinylidene chloride-based aqueous latex having a ratio of vinyl chloride to vinylidene chloride of 100: 20 to 100: 180 and a weight average molecular weight of 30,000 to 200,000 containing no more than 5% by weight of other functional group monomers. The solid content of (B) is mixed with 5 to 40 parts by weight with respect to 100 parts by weight of the solid content of (A), and the amount of chlorine is 2.5 to the total solid weight. (C) an inorganic powder is blended with an aqueous resin composition of about 15.0% by weight ,
The pigment volume concentration is adjusted to 15 to 60%.
Water-based universal surfacer . 3. The method according to claim 2, wherein the hydroxyl group-containing monomer is 2
The aqueous universal surfacer according to claim 2, which is -hydroxyethyl methacrylate.