JPH0134543B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to an emulsion resin-based coating composition that is applied to the interior and exterior of buildings, and particularly to a quick-drying coating composition that is excellent in forming patterns using a pattern roll. BACKGROUND OF THE INVENTION In recent years, inorganic decorative boards such as hardboard, asbestos slate, and silicone boards have been widely used for the interior and exterior walls of buildings. These boards are usually painted after being used because the materials themselves lack aesthetic appeal and durability such as water resistance. In recent years, instead of the traditional method of forming walls for buildings and then painting them, these boards are painted continuously in a factory and then transported to the construction site.
It is finished as a wall. As an emulsion paint composition for indoor and outdoor use,
For example, it is described in Japanese Patent Application Laid-Open No. 56-50973.
This is a latex paint composition containing polymerized resin particles containing at least 25% vinyl acetate and a diallyl-based urea compound as a copolymerized component. It was not intended to be used in construction methods. Problems to be Solved by the Invention In manufacturing such painted building materials, there are various problems as described below. From the viewpoint of durability, the painted boards used for exterior walls are
Furthermore, from the viewpoint of forming a pattern, a thick film coating of approximately 300 to 1500 g/m ² is required. Furthermore, for continuous production within a factory, the paint must be quick-drying. In other words, productivity in the case of baking-type paints depends on the flash-off zone of the solvent that cures the paint and the length of the baking booth, but in the case of room-temperature drying paints, especially water-based paints, Securing the space necessary for drying (long conveyor line or large space) is a major problem. In order to minimize this drying area,
It is desired that paints dry as quickly as possible without impairing other properties. In addition, quick drying properties are desired from the viewpoint of ease of maintaining the shape of the pattern applied to the coating film (pattern formability). However, if the paint dries too quickly, the coating workability (suitability for roll coating, suitability for circulation of the paint within the roll coater) will decrease, and the smoothness of the coating film will also decrease, so drying performance is an important factor. From these points, we provide a paint that satisfies the required properties such as quick drying, pattern formation, roll coating suitability during painting, paint circulation suitability within the roll coater, coating film appearance, and durability. This is the object of the present invention. Means for Solving the Problems The present invention provides: A emulsion resin 7-22% by weight B1 hydroxycellulose derivative modified with an alkyl group having 2-3 carbon atoms 0.1-2% by weight B2 having 2-3 carbon atoms For use in pattern rolls with excellent pattern forming properties, containing 0.2 to 4% by weight of polyether of polyalkylene glycol, C, 50 to 80% by weight, D, and 12.7 to 22% by weight of water, and having a viscosity of 150 to 300 Ps. It is an emulsion paint composition. When carrying out the present invention, the ratio of B1 and B2 is preferably 80-3/20-97, and the ratio of fine pigments of less than 50 μm to coarse pigments of 50 μm or more is 40-60. /60 to 40 is preferable. The roll coater used as a means for applying the paint of the present invention includes roll coating methods such as a natural roll, a reverse roll, and a curtain roll. The coating material of the present invention is suitably used in natural roll and reverse roll systems. In addition, the pattern roll has a pattern consisting of uneven parts on the surface of the cylindrical roller to form a pattern, and the pattern is formed by moving the base plate or the pattern roll carrying paint with no gap between them. let Considering the releasability of the roll and coating film after pattern formation, the material for the surface of the pattern roll is preferably a polyolefin or polysiloxane material, and a method of improving the releasability by applying a mold release agent is also used. . Each part constituting the present invention will be explained in detail below. (Emulsion Resin) As the emulsion resin used in the present invention, those that dry at room temperature and are commonly used in architectural paints, such as acrylic resin, vinyl acetate-acrylic resin, and styrene-acrylic resin, can be employed. (Hydroxycellulose derivative) The hydroxycellulose derivative used in the present invention has a viscosity of 300 to 6000 cps/25 from the viewpoint of manufacturing convenience, roll coater suitability, and pattern forming properties.
℃, optimally 2400 to 3000 cps. (Polyalkylene glycol ether) The polyalkylene glycol ether in the present invention has a molecular weight of 5,000 to 5,000 from the viewpoint of viscosity stability.
30,000, optimally 10,000 to 20,000. (Pigment) Calcium bicarbonate is often used as a pigment in the present invention, but in addition to 08 heavy carbon, there are also 8
Silica sand (calcium carbonate and silica sand pigment),
For fine particles less than 50 μm (280 mesh or less), N heavy carbon or R heavy carbon, and a coloring agent (titanium with other coloring pigments) are used. A detailed explanation of the above-mentioned pigments is as follows.

【table】

[Table] (Water) Tap water is usually used as the water in the present invention, but ion-exchanged water or distilled water may also be used. Water is used as a diluent to obtain a viscosity of 150-300Ps for coating the paint. EXAMPLES Examples and comparative examples are given below to explain the present invention in detail, but the present invention is not limited to the following examples. Examples 1 to 8 and Comparative Examples 1 to 6 A mixture of various components listed in Table 1 of the latter was used for testing. The test method is as follows. (Example of Pattern Formation) A pattern was formed on a base plate using the instrument shown in FIG. The paint was supported on the base plate, and the pattern roll was placed on it. The base plate or pattern roll was moved in a state where they were in contact with each other so that there was no gap between them. The thickness of the mold is 0.2mm±0.1mm for the concave part and 5mm±1mm for the convex part.
Embossed with precision. The conveyor speed and roll speed of the base plate were both 15 m/min. In order to form a brick-like pattern as an example of enhancing the design name, Examples 1 to 4 and Comparative Examples 1 to 3 were used.
During the formulation of the composition, 0.3% by weight of Bengara and 1% by weight of titanium white were added to the composition. Since the film was thick, a pale brick color was obtained by mixing the colored pigment in this pattern. (Test and Judgment) The following characteristics required when mass-producing uneven patterns using a pattern roll were investigated. Suitability for roll coater Capable of uniformly coating the entire surface of the board using a reverse roll coater. Circulation within the roll coater Paint circulation between the paint tank and coater can be maintained (painting management). Embossed mold (pattern-forming mold) The paint extruded into the convex part of the pattern roll moves to the concave part, allowing the pattern created on the pattern roll to be formed as is. Shape retention The pattern formed during the drying process does not change. Each property was determined by the following method. Pattern Formation Properties When a pattern was applied, it was visually determined that the paint flowed smoothly in the uneven pattern forming area and that the pattern could be clearly expressed. 〇 The pattern is reproduced. △ The pattern has changed slightly. × The pattern changed significantly and became unclear. Shape Retention Property It was visually determined that the formed pattern did not flow until drying, the unevenness did not flatten, and the initial pattern was maintained. 〇 The pattern did not change and the initial pattern was maintained. × The pattern has become distorted and has changed significantly. Roll coater suitability When performing roll coater painting, the presence or absence of phenomena such as roping and scuffing that impede uniform coating of the paint film was determined visually. 〇 There was no roping or smearing, and the application was smooth. △ Roping and scuffing are observed. × Roping and smearing are significant. Roll Coater Circulation During roll coater painting, the paint flows smoothly from the paint tank to the roll and its circulation system, and it was visually determined whether paint separation occurred. 〇 Good circulation of paint. × Paint accumulates in the pipe and paint circulation is poor. The evaluation results of various performances are shown in Table 1 below.

【table】

[Table] From the test results, it can be seen that the more coarse the pigment, the worse the roll coater suitability and circulation within the roll coater, and the more fine the pigment, the worse the shape retention. Furthermore, if the hydroxycellulose derivative is too large, suitability for a roll coater and circulation within the roll coater will be poor, and conversely, if the polyalkylene glycol ether is too large, shape retention will be poor. If the viscosity is 300 cps or more, the coating and work efficiency will deteriorate, and if the viscosity is 150 cps or less, both pattern formation and shape retention will be poor. Pattern-forming properties are poor no matter where the above components are concentrated. Therefore, the balance between the above-mentioned properties, and is achieved when the ratio of coarse pigment to fine pigment is 6/
4-4/6, hydroxycellulose derivative is 0.1
~2.0 wt%, polyalkylene glycol ether from 0.2 to 4.0 wt%, and viscosity well maintained in the range of 150 cps to 300 cps. Effects of the Invention The present invention can provide a paint having a viscosity suitable for painting workability by using a vehicle containing two types of specific thickeners for an emulsion resin. Furthermore, by blending fine pigments and coarse pigments in a specific ratio, coating workability can be adjusted to an appropriate range. The paint of the present invention is a paint that has improved quick-drying properties and pattern-forming properties while maintaining conventional coating performance.

[Brief explanation of drawings]

FIG. 1 is an illustrative perspective view of the apparatus used to test the coating composition of the present invention. 1...Bedboard, 2...Paint, 3...Pattern roll.

Claims (1)

[Scope of Claims] 1 A Emulsion resin 7 to 22% by weight B1 Hydroxycellulose derivative modified with an alkyl group having 2 to 3 carbon atoms 0.1 to 2% by weight B2 Polyalkylene glycol ether having 2 to 3 carbon atoms An emulsion coating composition for pattern rolls, comprising: 0.2 to 4% by weight, C: 50 to 80% by weight, D: 12.7 to 22% by weight, and having a viscosity of 150 to 300 Ps. 2. The emulsion coating composition for patterned rolls according to claim 1, wherein the ratio of B1 to B2 is 80-3/20-97. 3. Claims 1 or 2, wherein the application material consists of a fine pigment with a diameter of less than 50 μm and a coarse pigment with a diameter of 50 μm or more, and the ratio of the fine pigment to the coarse pigment is 40-60/60-40. Emulsion coating composition for pattern rolls.