JPH086051B2 - Main material composition for multi-layer finish coating material containing fine bubbles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) In recent years, a building finish coating material has been widely used for beautiful clothes such as buildings and civil engineering structures. Among them, the present invention relates to a main material of a multi-layer finish coating material used for finishing makeup of buildings and the like, which aims at resource saving, weight reduction of buildings, and imparting heat insulating property, The use is, for example, in the field of construction.

(Prior Art) Conventionally, as a main material of a multi-layer finish coating material, there has been a material using cement, a synthetic resin solution, a synthetic resin emulsion, silica sol, or an alkali silicate as a binder. Further, as the pigment and extender pigment, titanium oxide, clay, zinc white, calcium carbonate, silica powder, etc. have been used. In addition, thickeners, film forming aids, defoamers, dispersants, wetting agents, preservatives, etc. were added. The main material composed of these components is produced by a conventionally known production method, and is produced by a roll mill, a ball mill, a sand mill, a dissolver, a Henschel mixer, or the like. In the conventional slurry paint, a defoaming agent is included in the formulation to adjust the weight and capacity per can.

(Problems to be Solved by the Invention) In the present invention, bubbles that would naturally enter in the past are positively taken in and utilized. The purpose is to improve workability in mechanical blowing, improve design, provide heat insulation by containing bubbles, and save raw materials for obtaining the same volume.

The background of these purposes will be described in order.When coating the main material of the multilayer coating material according to the invention of the present application, mechanical coating that uses a pressure pump together is widespread, but it causes clogging of the filter. In order to deal with this problem, the painting was improved, but there was no improvement in other methods, namely, reduction of the load on the machine and reduction of the load on the hose. This has shortened the life of the pump or hose.

Further, the specific gravity of the conventional slurry paint is about 1.6 to 2.3, and the applied amount is about 1.5 to 2.5 kg / m ^{2 on the} wall surface. Although the amount of coating may be controlled by weight, there was no idea of reducing the coating weight of a main material having the same volume by using a lighter coating material.

(Means for Solving Problems) In the present invention, the above-mentioned problems are caused by positively containing fine bubbles in the main material requiring the largest volume in the multilayer finish coating material. Is to solve. As a specific means for this, a foaming agent or / and a foaming synthetic resin emulsion and a thickening agent are mixed in the main material composition, and a composition containing fine bubbles is obtained by stirring at high speed, or foaming is performed. Agents and / or aqueous solution of foamable synthetic resin emulsion and compressed gas (air, nitrogen gas, helium gas, carbon dioxide gas, etc.) are passed through a multi-well column and mixed into the main material composition and dispersed. Can be obtained.

Further, the specific gravity of the obtained composition can be adjusted in the range of 0.3 to 1.5 mainly by the content ratio of the fine bubbles. This value is smaller than the conventional product values of 1.6 to 2.3. If the specific gravity is 1.5 or more, the mechanical effect and resource saving effect cannot be expected as compared with the conventional product, and if the specific gravity is 0.3 or less, the physical strength becomes weak and the practicality decreases. The optimum specific gravity range is between 0.6 and 1.2.

An anionic surfactant or a nonionic surfactant is used as a foaming agent, which is one of the means for containing fine bubbles. Examples thereof are coconut oil soap, sodium myristate, sodium palmitate, primary higher alcohol sodium sulfate, sorbitan monolaurate polyglycol ether, polyethylene glycol alkyl phenyl ether, polyethylene glycol alkyl ether, polyethylene glycol fatty acid ester, fatty acid. Examples include diethanol amide.

Further, the foamable synthetic resin emulsion means an acrylic resin emulsion, styrene / acrylic resin emulsion, styrene / butadiene resin emulsion, vinyl acetate synthesized in the presence of an anionic emulsifier or a nonionic emulsifier alone or in the presence of a compound.・ Acrylic resin emulsion, acrylic resin and Veova resin emulsion are available.

Further, there is a thickener as an auxiliary agent to be added in order to allow the microbubbles to exist stably in the composition for a long period of time, and examples thereof include methyl cellulose (MC), hydroxyethyl cellulose (HEC), polyethylene oxide (PEO) and the like. is there.
In addition, when the main material composition does not contain an antifoaming agent, it is possible to obtain a material having a small specific gravity at the time of stirring.

If the viscosity of the obtained composition is adjusted to 10 ps to 1000 ps according to a simple viscometer manufactured by Rion Co., fine bubbles can exist stably.

Besides, it is also possible to use together a dispersant and a wetting agent used in a usual coating composition. Therefore, the types of multi-layer finish coating materials obtained by using this invention are JIS A
According to the classification of 6910, multi-layer coating material Si, multi-layer coating material E, multi-layer coating material R
There is E etc.

(Operation) The microbubbles contained in the composition of the present invention have an action of reducing the amount of raw materials used and reducing the friction between the coating material and the machine contact portion during coating using a machine.

In addition, air bubbles do not disappear in the process of drying and curing, and a heat insulating layer can be formed separately from the continuous layer and the discontinuous layer.

(Example) Example 1; In the case of a multi-layer coating material Si As the composition of the composition, 20 parts by weight of colloidal silica was used.
Parts, acrylic synthetic resin emulsion 10 parts, foaming agent (polyoxyethylene alkylallyl ether) 1 part, thickener (MC) 0.5 part, hydrophilic solvent 1.5 parts, other additives (wetting agent, dispersant, preservative) 2 parts of the agent, antifungal agent, etc.) were first stirred under normal pressure to obtain a main material of the multi-layer coating material Si according to the present invention containing fine bubbles and having a specific gravity of 0.8. Using this composition as a main material, an acrylic synthetic resin emulsion primer was applied as the undercoat and a synthetic resin enamel was applied as the overcoat on a flexible board. The coating film performance is shown in Table 1.

Example 2; In the case of the multi-layer coating material E First, 5 parts of a foamable synthetic resin emulsion (styrene / acrylic type), 5 parts of water, in order to prepare a dispersion liquid of fine bubbles.
Foaming agent (polyoxyethylene alkyl ether), thickener (HEC) 0.3 parts, hydrophilic solvent 2 parts, other additives 1.2
Parts, stir under normal pressure to make microbubbles dispersed, and then knead 18 parts of styrene-acrylic synthetic resin emulsion as the main bond and 68 parts of extender pigment (calcium carbonate) to uniformly form microbubbles. A multi-layer coating material E according to the present invention having a specific gravity of 1.0 was obtained. This main material was combined with the undercoat and topcoat of Example 2 and coated on a flexible board. The performance test results for the coated plate of Example 2 are also shown in Table 1.

Example 3; In the case of multi-layer coating material RE First, 5 parts of water, a foaming material (polyoxyethylene lauryl ether), a thickener (HEC) 0.5 part, and other components were prepared in order to prepare a dispersion liquid of fine bubbles. 1.5 parts of an additive and 1.5 parts of a hydrophilic solvent were prepared and stirred under normal pressure to obtain a state in which fine bubbles were dispersed. Next, 25 parts of the epoxy resin emulsion and 60 parts of an extender pigment (calcium carbonate, silica powder) are uniformly kneaded, and the multi-layer coating material R according to the present invention having a specific gravity of 1.0 that uniformly contains fine bubbles.
Got E. This base material, an acrylic resin solution type undercoat, and a urethane resin enamel overcoat were applied on a flexible board. The results of testing the coated plate are shown in Table 1.

Example 4; Multi-layer main material E stretched type First, in order to prepare a dispersion liquid of fine bubbles, 5 parts of water, 0.5 part of a foaming agent (polyoxyethylene lauryl ether),
1 part of a thickener (HEC and MC) and 1.5 parts of other additives were stirred under normal pressure to obtain a state of dispersion of fine bubbles. Next, 40 parts of the acrylic synthetic resin emulsion and 52 parts of the extender pigment (calcium carbonate) were uniformly kneaded, and the multi-layer coating material E stretchable main material referred to in the present invention having a specific gravity of 0.8 containing uniformly fine bubbles was obtained. Obtained. This base material, a vinyl chloride resin solution type base coat and a urethane resin enamel were used as top coats and coated on a flexible board. The test results of the coated plate are shown in Table 1.

Comparative Example 1: In the case of multi-layer coating material Si As the composition of the composition, 20 parts of colloidal silica, 10 parts of acrylic synthetic resin emulsion, 5 parts of water, 0.3 defoaming agent
Parts, thickener 0.5 parts, and various additives 1.2 parts were stirred by a dissolver, and then extender pigment (calcium carbonate) 63 parts was uniformly kneaded to obtain a main material of a normal multi-layer coating material Si. This base material was coated on a flexible board using the undercoat and topcoat used in Example 1, and the coating film performance is shown in Table 1.

Comparative Example 2: In the case of the multi-layer coating material E As the composition of the composition, 5 parts of water, 0.2 part of a defoaming agent and a thickening agent were used.
Stir 0.3 parts and 1.5 parts of various additives with a dissolver, and then use styrene acrylic synthetic resin emulsion as a binder.
23 parts and extender pigment (calcium carbonate) 68 parts were kneaded to obtain a normal multilayer coating material E as a main material. This main material and the undercoat and topcoat used in Example 2 were applied on a flexible board,
The coating film performance is shown in Table 1.

Comparative Example 3: In the case of the multi-layer coating material E stretch type As the composition of the composition, 5 parts of water, 0.5 part of a defoaming agent, 1 part of a thickening agent, and 1.5 parts of other additives were stirred with a dissolver, and then a binder. As acrylic synthetic resin emulsion 40 parts,
52 parts of extender pigment (calcium carbonate) was uniformly stirred to obtain an ordinary multi-layer coating material E stretch type main material. This main material and Example 4
We paint on flexible board using undercoat, topcoat,
The coating film performance is shown in Table 1.

Incidentally, as a method of performance test, in adhesion, undercoat coating on a flexible board, the main material of the multilayer finish coating material is applied with a thickness of 1 mm using an applicator, and finally the top coating is applied,
It was cured under standard conditions for 1 week. After that, a 10 mm square cross cut was inserted and cellophane tape was attached, and it was quickly peeled off to check the remaining amount of the coating film. Judging by the approximate amount, 4/4 was ○, 2/4 was △, and 1/4 was ×.

In terms of water resistance, a test plate was prepared based on the usual specifications and also cured for 1 week. After that, the state of the coating film after immersing in normal temperature water for 10 days was observed, and the presence or absence of swelling, peeling, or the like was evaluated in three grades of ◯>Δ> ×.

For frost resistance, make a test plate as if it were water resistant,
After curing, 18 hours in 20 ℃ water ・ 3 hours in -20 ℃ atmosphere ・
A cycle of 3 hours in an atmosphere of 50 ° C. was repeated 10 cycles, and the presence or absence of swelling or peeling of the coating film was checked and evaluated in three grades of ○>△> ×.

With respect to mechanical pumpability, the main materials obtained in the examples and comparative examples were evaluated by a squeeze-type pumping pump by the size of the load of the pump when the transporting amount was constant when pumping 50 m. ○ in the evaluation becomes a 10 kg / cm ² less than the load, △ is the load of the 10~15kg~cm ^2, × it is 15 kg / cm ²
It represents the case of the load over.

Moreover, in coating workability other than coating film performance, Examples 1 to 4
According to the coating material of No. 3, as compared with Comparative Examples 1 to 3, the load on the motor during pumping under mechanical blowing was small, the pumping efficiency was good, and the working efficiency was improved.

(Effects of the Invention) According to the composition containing microbubbles of the present invention, the weight of the coating material required to obtain the same design can be reduced, and the load on the machine at the time of coating can be reduced, and at the same time, coating can be performed. The burden on workers can be reduced. In this way, the respective effects can be exerted on the raw material side, the machine side, and the person doing the painting work.

Continuation of the front page (56) Reference JP 62-39674 (JP, A) JP 58-199759 (JP, A) JP 60-127375 (JP, A) JP 50-67327 (JP , A) JP-B-49-20609 (JP, B1) JP-B-55-20510 (JP, B2)

Claims (3)

[Claims] 1. A foaming agent or / and a foaming synthetic resin emulsion and a thickening agent are mixed in the main material of a multi-layer finish coating material mainly used for finishing a building, and micro bubbles are formed by mechanical means. A main material composition for a multi-layer finish coating material containing micro-bubbles, characterized in that it is positively contained so that its specific gravity falls within the range of 0.3 to 1.5. 2. The main material composition for a multi-layer finish coating material according to claim 1, wherein the main material of the multi-layer finish coating material does not contain an antifoaming agent. 3. A multi-layer finish containing microbubbles according to claim 1, wherein a simple substance or a composite gas of air, nitrogen gas, helium gas and carbon dioxide gas is used as a gas component forming bubbles. Main material composition for coating materials.