JPH11222574A - Aqueous emulsion-type sealer composition for architectural coating and production of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emulsion-type sealer which has a reduced odor, excellent penetration to a porous substrate such as a mortar surface, a ceramic cement- based board or the like, excellent fixing properties and good adhesion to a topcoating agent and also provide a process for producing the sealer. SOLUTION: This emulsion obtained by emulsifying and dispersing a chlorinated polyolefin is constituted of an aqueous emulsion-type sealer composition for architectural coating. The composition comprises 100 pts.wt. chlorinated polyolefin, 5-50 pts.wt. plasticizer, 3-30 pts.wt. dechlorination stabilizer, 75-250 pts.wt. monobasic carboxylic acid ester-alcohol, 6-40 pts.wt. emulsifier and 40-630 pts.wt. water. A process for producing the sealer composition are also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emulsion composition effective as a sealer for architectural coatings, particularly a sealer used for a porous substrate such as a mortar surface or a ceramic cement board, and a method for producing the same.

[0002]

2. Description of the Related Art Since chlorinated polyolefins are supplied as solids, they are usually used by dissolving them in an organic solvent in order to use them as liquid sealers. Recently, water-based organic solvents have been desired due to the problems of toxicity, danger and odor of organic solvents. However, since chlorinated polyolefin has no fluidity, a method of once dissolving in an organic solvent to impart fluidity and then emulsifying is used. An emulsifier is used for emulsification. However, when an emulsifier is used, not only does the water resistance deteriorate, but also the adhesion between the sealer layer and the overcoat layer deteriorates, so that the amount of the emulsifier must be reduced. 2-2970
No. 2 describes a chlorinated polyolefin sealer containing an organic solvent as a water-dispersed coating. This is problematic in terms of toxicity and safety because it contains a large amount of organic solvent.In addition, a large amount of organic solvent is used in conjunction with the large amount of organic solvent because the solution of organic solvent is dispersed and emulsified. Water resistance is also insufficient. JP-A-2-91140 describes an aqueous dispersion type resin composition for a sealer. In this method, an organic solvent is used in the production process and finally the solvent is recovered from the dispersion by distillation under reduced pressure. However, since the solvent cannot be completely recovered, there is a problem that a solvent odor remains. JP-A-7-300517
Discloses a chlorinated polyolefin sealer having a low odor and no flash point, using dimethyl dibasic acid as an organic solvent. However, a large amount of the organic solvent is used, and a large amount of an emulsifier is used in conjunction with the organic solvent, and the water resistance and the adhesion to the overcoat layer are insufficient. The present inventor has previously disclosed in Japanese Patent Application Laid-Open No. 9-296145 a composition in which the solvent is used in combination with a diluent that does not dissolve the chlorinated polyolefin, thereby reducing the amount of the solvent used and improving water resistance and adhesion. Was. However, even with this composition, the permeation fixation of the porous substrate was not always satisfactory.

[0003]

In order to improve the permeation and fixation to a porous substrate, it is necessary to lower the viscosity of the polymer solvent solution in the emulsion particles. For this purpose, it is necessary to increase the blending amount of the organic solvent. However, if toluene, xylene or the like, which is a normal organic solvent, is used, the penetration and fixation properties are improved, but there are problems of odor, flammability and toxicity. An object of the present invention is to use an organic solvent having a low odor and a high flash point to improve permeation fixation to a porous substrate.

[0004]

As a result of investigations to solve the problems of the prior art, monobasic carboxylic acid ester alcohol is used as a high boiling point solvent for dissolving the chlorinated polyolefin in a specific amount relative to the chlorinated polyolefin. Thus, the present inventors have found that the problem can be solved, and completed the present invention.

The present invention relates to "1. An emulsion in which a chlorinated polyolefin is emulsified and dispersed, the composition comprising 100 parts by weight of a chlorinated polyolefin, 5 to 50 parts by weight of a plasticizer, 3 to 30 parts by weight of a dechlorination stabilizer, An aqueous emulsion type sealer composition for architectural coating, comprising: 75 to 250 parts by weight of a basic carboxylic acid ester-alcohol, 6 to 40 parts by weight of an emulsifier, and 40 to 630 parts by weight of water. , One or more selected from monobasic carboxylic esters and dibasic carboxylic esters, wherein the carboxylic ester-alcohol is selected from monobasic carboxylic esters-alcohols and dibasic carboxylic esters-alcohols 2. The aqueous emulsion type sealer composition for construction according to item 1, wherein the composition is one or more. 3. monobasic carboxylic acid ester - alcohol 2,
2. The aqueous emulsion sealer composition for construction according to item 1, which is 2,4-trimethyl-3-hydroxypentyl isobutyrate. 4. A solution obtained by dissolving and diluting 100 parts by weight of a chlorinated polyolefin, 5 to 50 parts by weight of a plasticizer, and 3 to 30 parts by weight of a dechlorinating stabilizer in 75 to 250 parts by weight of a monobasic carboxylate-alcohol, A method for producing an aqueous emulsion type sealer composition for construction, comprising adding to an aqueous solution consisting of 6 to 40 parts by weight of an emulsifier and 40 to 630 parts by weight of water and emulsifying and dispersing. About.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A sealer mainly comprising an aqueous emulsion of the present invention is prepared by first charging a chlorinated polyolefin, a plasticizer, a dechlorinating stabilizer, and a monobasic carboxylic acid ester alcohol into a container and stirring and mixing with a disperser. Form an organic solvent solution. Next, water can be produced by adding water in which an emulsifier is dissolved to this organic solvent solution, stirring and emulsifying and dispersing. Further, additives such as a filler, a thickener, and an antifoaming agent can be added to the emulsion produced by the production method. The sealer composition thus obtained is adjusted at the work site to a nonvolatile content of about 15% and applied. When the base material is porous, the chlorinated polyolefin solution in the particles permeates into the base material after application, and forms a strong sealer surface integrated with the base material.

Next, each material used in the present invention will be described. Chlorinated polyolefin The chlorinated polyolefin used in the present invention includes high-density or low-density polyethylene, crystalline or non-crystalline polypropylene, ethylene-propylene copolymer, chlorinated polyisoprene, etc. Although it may be carried out by any method, preferably, by a water medium method,
What is obtained by blowing and reacting chlorine gas under irradiation of a catalyst or ultraviolet rays is preferable. The chlorine content of the chlorinated product used in the present invention is 40 to 75% by weight.
If the chlorine content is less than 40% by weight, a coating film having sufficient physical properties cannot be formed due to poor cohesive strength of the resin. If the chlorine content is more than 75% by weight, the resin becomes too hard and cracks occur in the coating film. In any case, the performance as a sealer is not exhibited.

Plasticizer Chlorinated paraffin, phthalate ester, phosphate ester and the like can be used as the plasticizer. Among them, preferred is chlorinated paraffin having a strong affinity for chlorinated polyolefin. The amount to be used is 5 to 50 parts by weight, preferably 15 to 35 parts by weight, per 100 parts by weight of the chlorinated polyolefin. If the amount is less than 5 parts by weight, the plasticizing effect cannot be obtained. Due to plasticization, the cohesive strength of the coating film is remarkably reduced and a coating film having sufficient strength cannot be obtained.

Dechlorinating Stabilizers Stabilizing agents are used to prevent the emulsification system from becoming unstable due to desalination of chlorinated polymer compounds. Examples thereof include bisphenol A epoxy resins and bisphenol F epoxy resins. Epoxy resin or the epoxidized soybean oil,
Epoxidized linseed oil; The amount used is
If the amount is 3 to 30 parts by weight, and preferably 8 to 20 parts by weight, less than 3 parts by weight based on 100 parts by weight of the chlorinated polyolefin, the stabilizing effect cannot be obtained. The effect of plasticizing the chlorinated polyolefin is exerted and the strength of the coating film is significantly reduced.

Monobasic carboxylic acid ester alcohol The monobasic carboxylic acid ester alcohol used in the present invention acts as a solvent for the chlorinated polyolefin, and by using this, the fluidity inside the emulsion particles is improved, and This facilitates the later penetration of the chlorinated polyolefin into the inside of the substrate. The monobasic carboxylic acid ester-alcohol is an organic compound having a molecular weight of 130 to 250, and 2,2,4 trimethyl-3-hydroxypentylisobutyrate is a representative example and is preferably used. The monobasic carboxylic acid ester alcohol has a good affinity for the chlorinated polyolefin and can dissolve the chlorinated polyolefin with a small amount of use. If the molecular weight is less than 130, the fluidizing effect is large but the volatility is strong and it is difficult to handle. If the molecular weight is greater than 250, the fluidizing effect is small and the film is less likely to evaporate and remain on the coating film after forming the coating film. Preferred molecular weights are from 200 to 230. If the amount used is less than 75 parts by weight, which is 75 to 250 parts by weight with respect to 100 parts by weight of the chlorinated polyolefin, it becomes difficult to form a solution of the chlorinated polyolefin,
If the amount is more than 0 parts by weight, the drying of the sealer coating film becomes slow.

Emulsifier In the present invention, one or more of an anionic surfactant and a nonionic surfactant can be used. As anionic surfactants, sodium laurate, sodium stearate, aliphatic sodium salts such as sodium oleate, potassium laurate, potassium stearate,
Aliphatic potassium salts such as potassium oleate; aliphatic ammonium salts such as ammonium laurate, ammonium stearate, and ammonium oleate; alkylbenzene sulfonates such as nonylbenzenesulfonate and dodecylbenzenesulfonate; and higher alkyl ether sulfates. Can be As nonionic surfactants, polyoxyethylene nonyl phenyl ether, polyoxyethylene lauryl ether, polyoxyethylene glycol type nonionic surfactants such as polyoxyethylene oleyl ether, higher aliphatic amines, aliphatic amides Non-ionic surfactants that are ethylene oxide adducts, copolymers of polyoxyethylene and polyoxypropylene (eg, Pluronic, manufactured by Asahi Denka Co., Ltd.), polyhydric alcohol-type and ester-type non-ionic surfactants (For example, Leo Doll, manufactured by Kao Corporation) is used. In general, anionic surfactants have high emulsifying power and have a few problems of cloud point, but have drawbacks such as a lot of foaming and poor chemical stability of the obtained emulsion. On the other hand, nonionic surfactants generally have low foaming properties, and by using an index such as HLB,
It is easy to select one with the required properties. However, such a nonionic surfactant has a problem of a cloud point, and the emulsification and dispersion may be performed at a temperature of 80 ° C. or higher in the present invention. Therefore, the cloud point is preferably 100 ° C. or higher. The amount used is 10 chlorinated polyolefins.
It is 6 to 40 parts by weight with respect to 0 part by weight. If it is less than 6 parts by weight, the emulsification and dispersion will be poor, and if it is more than 40 parts by weight, the adhesion and water resistance will decrease.

The amount of water used is preferably from 40 to 630 parts by weight. If the amount is less than 40 parts by weight, the production of the emulsion becomes difficult due to the large amount of resin in the emulsion. Becomes defective. If desired, pigments, fillers, pigment dispersants, thickeners, wetting agents, defoaming agents, neutralizing agents, antiseptic / antifungal agents, and the like can be added. As the filler, calcium carbonate,
Talc, mica, kaolin, pyrophyllite, silica powder and the like can be used. Among them, preferred are pyrophyllite, silica powder and the like which are rich in a silica component in chemical composition. The reason is that the storage stability after blending in the emulsion is good. On the other hand, aluminum silicates (kaolins), alkaline earth metals (calcium carbonate, talc, etc.) and those containing alkali metals (mica, etc.) having less than half the silica component tend to cause aggregation of emulsion particles during storage. Need to be used with care.
In particular, those containing an alkaline earth metal and an alkali metal have a strong tendency.

[0013]

EXAMPLE 1 100 parts by weight of chlorinated polyolefin and 30 plasticizers were placed in a container.
Parts by weight, 10 parts by weight of a dechlorination stabilizer, and 100 parts by weight of 2,2,4-trimethyl-3-hydroxypentylisobutyrate are charged and sufficiently stirred by a disperser to obtain a solvent solution. Next, this solvent solution is heated, and an aqueous solution consisting of 12 parts by weight of an emulsifier and 254 parts by weight of water is added, followed by stirring and emulsification and dispersion. The resulting composition was a uniform milky white emulsion. The nonvolatile content of this emulsion was adjusted, additives such as preservatives were added, and the mixture was stirred to obtain a sealer composition.

Example 2 100 parts by weight of 2,2,4-trimethyl-3-hydroxypentylisobutyrate was changed to 150 parts by weight, and an aqueous solution consisting of 12 parts by weight of an emulsifier and 254 parts by weight of water was mixed with 16 parts by weight of an emulsifier. Example 1 was repeated except that the solution was changed to an aqueous solution consisting of 214 parts by weight of water.

Example 3 100 parts by weight of 2,2,4-trimethyl-3-hydroxypentylisobutyrate was changed to 200 parts by weight, and an aqueous solution comprising 12 parts by weight of an emulsifier and 254 parts by weight of water was replaced with 22 parts by weight of an emulsifier. Example 1 was repeated except that the aqueous solution was 178 parts by weight of water.

Comparative Example 1 100 parts by weight of 2,2,4-trimethyl-3-hydroxypentylisobutyrate was changed to 50 parts by weight, and an aqueous solution comprising 12 parts by weight of an emulsifier and 254 parts by weight of water was emulsified with an emulsifier 9
Example 1 was repeated except that the solution was changed to an aqueous solution consisting of 264 parts by weight of water and 264 parts by weight of water.

Comparative Example 2 100 parts by weight of 2,2,4-trimethyl-3-hydroxypentylisobutyrate was changed to 300 parts by weight, and an aqueous solution comprising 12 parts by weight of an emulsifier and 254 parts by weight of water was replaced with 30 parts by weight of an emulsifier. Comparative Example 1 was carried out in the same manner as in Comparative Example 1, except that the aqueous solution was changed to an aqueous solution comprising 210 parts by weight of water.

Comparative Example 3 An aqueous solution consisting of 12 parts by weight of an emulsifier and 254 parts by weight of water was used instead of 100 parts by weight of 2,2,4-trimethyl-3-hydroxypentylisobutyrate. Example 1 was repeated except that the solution was changed to an aqueous solution consisting of 333 parts by weight of water and 333 parts by weight of water.

Evaluation 1. Emulsifying dispersibility The obtained sealer composition is spread on a glass plate, and it is visually confirmed whether the composition is uniformly dispersed. Uniform ……… ○ Almost uniform …… △ Non-uniform ……… × 2. Odor Almost odorless …… ○ Unpleasant ………… ×

3. Flash point Measured with a setter-closed flash point measuring device. 4. Drying property A commercially available slate plate having a thickness of 5 mm is brush-coated with 60 to 80 g / m ² of the sealer composition diluted twice with water, and dried at room temperature for one day. I do. Without tack …… ○ With tack …… ×

5. Permeation fixability Sealer composition 100-140 diluted twice with water on a calcium silicate plate having a density of 0.8, which is a porous substrate.
g / m ² was brush-coated, dried at room temperature for 1 day, and forcibly peeled off with a cellophane tape for evaluation. No peeling ……… ○ Substrate peeling below the fixed surface layer part ……… ○ Sealer surface / substrate interface peeling ……… × 6. Adhesion to elastic paint Base material: Slate board JIS A 69
Apply a 10-layer single-layer elastic paint to a thickness of 1 mm, and
After drying for 2 days, the adhesion in normal condition and after immersion in water for 7 days is 2
After the mm-th cross cut, the sheet was forcibly peeled off with a cellophane tape and evaluated. Base material: calcium silicate plate of density 0.8 (porous base material) A calcium silicate plate of density 0.8 is brush-coated with 100 to 140 g / m ² of the sealer composition diluted twice with water,
After drying at room temperature for 1 day, apply a single-layer elastic paint of JIS A 6910 standard to a thickness of 1 mm, dry at room temperature for 7 days, and forcibly peel off the adhesiveness under normal conditions and after 7 days immersion with a cellophane tape after 12 mm cross-cut. Was evaluated. The peeling condition is as follows: K: peeling of the surface layer of the base material K / S: peeling of the interface between the base material and the sealer coating S / P: peeling of the interface between the sealer coating and the elastic paint P: surface of the elastic paint K and P good K / S and S / P failure. Table 1 shows the evaluation results.

[0022]

[Table 1]

[0023]

EFFECTS OF THE INVENTION The present invention has excellent effects of being excellent in permeability and adhesion to a mortar surface or a porous substrate such as ceramic cement board, excellent in adhesion to an overcoat material, and low in odor.

Claims (4)

[Claims] 1. An emulsion in which a chlorinated polyolefin is emulsified and dispersed, wherein the composition is 100 parts by weight of a chlorinated polyolefin, 5 to 50 parts by weight of a plasticizer, 3 to 30 parts by weight of a dechlorination stabilizer, and a monobasic carboxylic acid ester. -An aqueous emulsion type sealer composition for architectural coating, comprising: 75 to 250 parts by weight of an alcohol, 6 to 40 parts by weight of an emulsifier, and 40 to 630 parts by weight of water. 2. The carboxylic acid ester is one or more selected from a monobasic carboxylic acid ester and a dibasic carboxylic acid ester, and the carboxylic acid ester-alcohol is combined with a monobasic carboxylic acid ester-alcohol. The aqueous emulsion type sealer composition for building according to claim 1, which is one or more selected from basic carboxylic acid ester-alcohol. 3. The aqueous emulsion sealer composition for architectural use according to claim 1, wherein the monobasic carboxylic acid ester-alcohol is 2,2,4-trimethyl-3-hydroxypentylisobutyrate. 4. Dissolve and dilute 100 parts by weight of a chlorinated polyolefin, 5 to 50 parts by weight of a plasticizer, and 3 to 30 parts by weight of a dechlorination stabilizer in 75 to 250 parts by weight of a monobasic carboxylate-alcohol. A method for producing an aqueous emulsion-type sealer composition for construction, comprising adding the obtained solution to an aqueous solution comprising 6 to 40 parts by weight of an emulsifier and 40 to 630 parts by weight of water and emulsifying and dispersing.