JPH0734006A - Primer coating composition - Google Patents

Abstract

PURPOSE:To obtain the subject composition comprising a specific high mol.wt. acrylic resin and a vinyl chloride resin produced by copolymerizing vinyl chlo ride with vinylidene chloride in a specific solid content ratio, capable of control ling the absorbability of a substrate and of reducing the coating number of finishing coating films, and good in durability. CONSTITUTION:This primer coating composition capable of controlling the absorbability of a substrate in the coating of a finishing coating material on a porous material as a substrate, capable of reducing the coating number of finishing coating films, enhanced in curability, and capable of being used for general purposes without selecting the kind of the finishing coating material contains (A) 100 pts.wt. (as solid content) of a high mol.wt. acrylic resin obtained by copolymerizing a monomer of formula I (R<1> is H, CH3, C2H4OH) with a monomer of formula II [R<2> is C3H7, CH2CH(C2H5)C4H9] in a solid content ratio of 1:(0.3-0.6) and (B) 50-400 pts.wt. (as solid content) of a vinyl chloride resin obtained by copolymreizing vinyl chloride with vinylidene chloride in a solid content ratio of 1:(0.1-1).

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention adheres to various finishing coating materials,
The present invention relates to an undercoat material composition which markedly improves waterproofness, water impermeability, alkali sealability and solvent resistance of an inorganic base material such as concrete, mortar, PC board and ALC.

[0002]

2. Description of the Related Art Conventionally, concrete, mortar, PC
An undercoat material has been used when applying a finish coating material to an inorganic substrate such as a plate or ALC. This is because when a finish coating material is applied directly to the surface of a porous and highly absorbent base material, only the vehicle in the coating material is absorbed by the base material, which impairs the durability of the coating film. This is because the material is applied to reduce the absorption of the vehicle. Further, in the case of new concrete, it is possible to prevent the finish coating film from directly contacting the alkali of the concrete and deteriorating. Such undercoat materials include
There are various types such as urethane type, epoxy type, and acrylic type, but the purpose thereof is not only the above-mentioned sealing effect but also the adhesiveness with the coating material to be applied thereon. Here, generally, there are anchoring theory, surface chemistry theory, SP theory, diffusion theory, electrostatic theory, etc., regarding the adhesion mechanism of the coating film. The anchoring theory is that when there is a deep gap in the solid surface, the paint vehicle penetrates inside and sticks to the solid surface by rooting like a anchor. The theory of interfacial chemistry is that when the surface tensions γ of both the adhering A and B phases are equal, the interfacial tension becomes a minimum of zero and the adhering becomes maximum. The SP theory is that the maximum adhesion occurs when the solubility parameters of both A and B phases are equal. The theory of diffusion is that, in the case of adhesion between polymers, when the diffusion of molecules across the interface occurs, the adhesion does not become a planar phenomenon but a volume phenomenon having a certain depth. The electrostatic theory of is that the essence of adhesive force is due to positive and negative electric forces. These theories also apply in the case of improving the adhesion between the undercoat material and the finish coating film on it. However, the anchoring theory does not cause a problem with the finish coating film to be applied thereon after the undercoating material is dried and cured. Further, regarding the surface chemistry theory, SP theory, and diffusion theory, if there are various kinds of coating films that come on, the undercoat material must be changed each time. Especially, the coating film on the top is, for example, JIS A 6909 flexible shape, JIS A
In the case where the 6910 waterproof type and similar materials have elasticity, these adhesion mechanisms are often not as applicable as in a hard coating film, and the mechanism cannot improve the adhesion. On the other hand, polypropylene with a chlorine group introduced into the side chain is used, and the electrostatic effect of the entire coating film due to the high electronegativity of this chlorine group is used to adhere even an elastic coating film. It has become possible to improve the sex.

[0003]

However, chlorinated polypropylene uses carbon tetrachloride in its manufacturing process. This carbon tetrachloride is highly toxic, and its use has been restricted by various laws and regulations for chlorine-based organic solvents due to recent environmental protection policies, and it will be totally abolished in the future. Furthermore, when this chlorinated polypropylene is used as an undercoating material, if a solvent-based one is used as the finishing coating material to be applied on it, the solvent resistance of the chlorinated polypropylene is low, The coating film swelled to cause problems such as poor adhesion and swelling and peeling of the coating film. Therefore,
The actual situation is that the undercoat material is appropriately changed and used depending on the type of the finish coating material to be applied on top. in this way,
It shows excellent adhesion regardless of the type of finishing material to be applied on top, and in particular it adheres to elastic finishing coating material as well as waterproofing of inorganic base materials such as concrete base material and mortar,
A general-purpose undercoating material composition that remarkably improves water impermeability, alkali sealability, and solvent resistance has long been desired by the industrial world. The problem to be solved by the present invention is to produce such an undercoat material composition.

[0004]

In order to solve such a problem, the present inventors have developed a resin (hereinafter simply referred to as "vinyl chloride resin") obtained by copolymerizing vinyl chloride and vinylidene chloride instead of chlorinated polypropylene. I think that the problems of adhesion and solvent resistance can be solved by using the above-mentioned ".", And as a result of earnest research, by combining a specific high molecular weight acrylic resin and the vinyl chloride-based resin, The present invention has led to the invention of a primer coating composition. That is, (A) a high molecular weight acrylic resin having a weight average molecular weight of 150,000 to 300,000, (B) a vinyl chloride resin obtained by copolymerizing vinyl chloride and vinylidene chloride at a solid content ratio of 1: 0.1 to 1,
5 parts by weight of (B) based on 100 parts by weight of solid content
The amount is 0 to 400 parts by weight. When the weight average molecular weight of the high molecular weight acrylic resin (A) is less than 150,000, the sealing properties and solvent resistance are inferior.
When it is larger, the viscosity becomes so high that it becomes difficult to make it into a paint. The monomer composition of the high molecular weight acrylic resin (A) is not particularly limited as long as it has a viscosity that allows it to be mixed with the component (B), but is preferably a monomer represented by Chemical Formula 1 or Chemical Formula 2. The solid content ratio is 1: 0.3
Copolymerized with 0.6 is preferable.

[Chemical 1]

## STR00002 ## Next, when the solid content ratio of vinyl chloride and vinylidene chloride as the component (B) exceeds the above range, when the vinylidene chloride is less than 0.1, the adhesion is poor, and when it is more than 1, the polymerization is As a result, the molecular weight becomes low, so that the material is more sucked into the substrate and the sealing property is deteriorated. Further, the molecular weight of the component (B) is not particularly limited as long as the vinyl chloride / vinylidene chloride solid content ratio is within the above range, but it is necessary to be 20,000 or more in consideration of the problem of sealing property. Both the component (A) and the component (B) may be produced by a general method such as solution polymerization, and are not particularly limited. In addition, the organic solvent used during the polymerization also causes the resin to gel due to solvent shock when the components (A) and (B) are mixed, and the compatibility of the solvent itself used for both components is There is no particular limitation except for bad cases. Further, the component (A) may be copolymerized with styrene or the like, and the component (B) may be copolymerized with a monomer such as maleic acid or vinyl acetate.

[0005]

【Example】

(Example 1) Elasticity was obtained with respect to an undercoat material composition in which a xylene solution of a polymer acrylic resin having a molecular weight and a monomer composition shown in Table 1 and an ethyl acetate-toluene solution of a vinyl chloride resin were compounded at the ratios shown. An adhesion test with a coating material, a water permeability test, an alkali sealability test, and a blistering property test were conducted by the following methods. The results are shown in Table 3. (Test method) (1) Adhesion test with elastic coating material Various priming materials were applied to a mortar plate so that the film thickness would be 0.125 μm, and the elastic coating material was dried for 24 hours under standard conditions. JIS K 5400 8 was used, which was applied to a film thickness of 0.125 μm, dried for 72 hours in a standard state, immersed in warm water at 50 ° C. for 16 hours, and then dried for 24 hours in a standard state. 5.5.2 Perform the test according to the cross-cut tape method. The evaluation method was 0 to 10 points in the cross-cut tape test. (2) Water Permeability Test According to JIS K 5400 8.16 water permeability test method, a test body was prepared and tested so that the coating amount of the resin solid content was 20 g / m ² . In the evaluation method, the amount of water permeation after 24 hours was expressed in ml. (3) Alkali sealability test The deionized water used for the water permeability test is mixed with a phenolphthalein solution so as to be 0.01 wt%, and the presence or absence of alkali elution is confirmed. As for the evaluation method, those in which phenolphthalein was discolored were evaluated as having alkali elution, and those in which there was no discoloration were evaluated as no alkali elution. (4) Blistering test A test piece similar to that used in the "Adhesion test with elastic coating material" was immersed in warm water at 50 ° C for 72 hours and visually checked for blister at the interface between the undercoat material and the elastic coating material. Check for the presence. (Examples 2 to 4) Examples 1 to 4 were prepared with respect to the undercoat material composition in which the polymer acrylic resin xylene solution having the molecular weight and the monomer composition shown in Table 1 and the vinyl chloride resin ethyl acetate-toluene solution were blended in the ratios shown. The test was conducted in the same manner as 1.
The results are shown in Table 3. (Comparative Examples 1 and 2) Tests were performed in the same manner as in Example 1 except that the ratio of the high molecular weight acrylic and the vinyl chloride resin was changed as shown in Table 2. The results are shown in Table 3. In Comparative Example 1 in which the ratio of the vinyl chloride resin is higher than the specified range of the present invention, the sealing property was inferior. On the contrary, in Comparative Example 2 in which the ratio of the high molecular weight acrylic was higher than the specified range of the present invention, the adhesion was inferior. Comparative Examples 3 to 4 Tests were performed in the same manner as in Example 4 except that the weight average molecular weight of the high molecular weight acrylic was changed as shown in Table 2. The results are shown in Table 3. In Comparative Example 3 in which the average molecular weight of the high molecular weight acrylic was lower than the specified range of the present invention, the sealing property was inferior. On the other hand, in Comparative Example 4 in which the average molecular weight is higher than the specified range of the present invention, the viscosity of the high molecular weight acrylic resin solution was very high, and a large amount of a solvent for dilution was required, which made it difficult to form a coating material. (Comparative Examples 5 to 6) Tests were performed in the same manner as in Example 1 except that the monomer composition of the vinyl chloride resin was changed as shown in Table 2.
The results are shown in Table 3. In Comparative Example 5 in which the proportion of vinyl chloride in the vinyl chloride resin was higher than the specified range of the present invention, the result was that the adhesion was poor. In Comparative Example 6 in which the ratio of vinylidene chloride in the vinyl chloride resin was higher than the specified range of the present invention, the degree of polymerization was lowered and the sealing property was deteriorated. (Comparative Examples 7 to 8) A test was conducted using a vinyl chloride resin or a high molecular weight acrylic resin alone. The results are shown in Table 3. Comparative Example 7 in which the vinyl chloride resin alone was inferior in sealing property, and Comparative Example 8 in which only the high molecular weight acrylic resin was inferior in adhesion property.

[Table 1]

[Table 2]

[Table 3]

Claims (2)

[Claims] 1. A weight average molecular weight of (A) is 150,000 to 3
A high molecular weight acrylic resin of 00000, (B) vinyl chloride and vinylidene chloride are copolymerized at a solid content ratio of 1: 0.1 to 1 to obtain a vinyl chloride resin, and (B) is based on 100 parts by weight of the solid content of (A). 50 to 400 parts by weight in terms of solid content is added to the undercoat material composition. 2. A high molecular weight acrylic resin (A) comprises a monomer represented by Chemical Formula 1 or Chemical Formula 2, and a solid content ratio of 1: 0.3 to.
The undercoat material composition according to claim 1, wherein the undercoat material composition is a copolymer of 0.6. [Chemical 1] [Chemical 2]