JP3421149B2 - One-part inorganic surface conditioning coating material with excellent storage stability - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel one-component inorganic surface conditioning coating material having excellent storage stability. More specifically, it is a one-part type inorganic surface conditioning coating material, so there is no need to mix it on site, work can be done without forming lumps, good water resistance and durability, and compatibility with the base The present invention relates to a one-pack type inorganic surface-modifying coating material which is capable of forming a coating film having good properties, and which can be dried at an early stage to save the steps and the construction period and has excellent storage stability.

[0002]

2. Description of the Related Art Conventionally, in the construction of concrete structures, cast-in-place concrete (hereinafter simply referred to as "RC"), precast concrete members (hereinafter simply referred to as "PC"), cement mortar, Light-weight aerated concrete (hereinafter simply referred to as “ALC”) and the like are used, but when these are used, irregularities are likely to be formed on the surface or bubble holes are formed inside. In order to correct these, polymer cement mortar or polymer cement paste prepared by cement and resin emulsion, particularly Portland cement and acrylic resin emulsion, is used.

In addition to the above, an organic filler containing a large amount of an inorganic substance such as calcium carbonate or siliceous substance can be used in addition to the acrylic or acrylic copolymer resin emulsion without using cement.

Thus, the coating material such as the polymer cement mortar or polymer cement paste used for correcting or adjusting the surface of the concrete coated object is the same cement as the concrete material such as RC, PC, ALC as the base. Since it is used as a binder, it is generalized because it has good compatibility with the concrete material of the base and the coating material of the top coat, and also has an excellent track record in terms of durability, but in terms of workability, for example, There is a disadvantage of ~ shown in. ． At the time of use, the cement powder and the synthetic resin emulsion-based powder must be mixed at a certain ratio on site. ． If the mixing is insufficient, lumps commonly called “butsu” or “mamako” tend to be generated, which leads to deterioration in performance. ． After mixing the above raw materials, the work must be performed within a short time, usually within 1 to 2 hours.

[0005]

As described above, in the case of polymer cement mortar or paste, since it is a so-called two-component type, it is necessary to mix the raw materials on site and, if not used in a short time, it is hardened. However, it is inefficient in terms of work, but on the other hand, when the organic filler containing no cement is used, it is a one-pack type, so it is excellent in workability and workability, but water resistant. The performance tends to be inferior and the reliability in terms of performance is low.

As described above, in the case of the conventional concrete surface conditioning coating material, both the polymer cement mortar or paste and the organic filler have contradictory advantages and disadvantages, so that they are used properly according to the application and the required quality. Is.

Further, in the actual construction work, labor saving on-site work is also a demand of the times, and the development of a process-saving and construction-saving type finish coating material having both the function of the base conditioning material and the function of the finish coating material. Is desired.

Thus, the present invention is a pre-prepared one-component type inorganic surface conditioning coating material, which does not need to be prepared on site, can be worked without forming lumps, and is water resistant. An object of the present invention is to provide a surface-conditioning coating material which can form a coating film having good durability and good compatibility with a substrate, and which can be dried at an early stage to save steps and work period. It is a thing.

[0009]

Therefore, the present invention provides a Portland cement, an acrylic resin aqueous emulsion, a filler, and at least two types of cement hydrates selected from the group consisting of alcohol, ligninsulfonic acid and zinc oxide. The present invention provides a one-component inorganic surface conditioning coating material having excellent storage stability, which is prepared by mixing in advance with a reaction retardant to prepare a one-component type.

The one-pack type inorganic surface conditioning coating material having excellent storage stability of the present invention will be described in detail below.

The one-component type inorganic surface conditioning coating material excellent in storage stability of the present invention is mainly composed of portland cement, white portland cement, acrylic resin emulsion and filler as in the case of ordinary polymer cement base conditioning material. As a component, it is designed to maintain water resistance and durability.

The acrylic resin aqueous emulsion used as a polymer is obtained by copolymerizing monomers selected from the group consisting of methyl methacrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, acrylonitrile and styrene. An aqueous emulsion of the obtained copolymer is used. The acrylic resin aqueous emulsion has a solids concentration of 40 to 60.
% Is good. As the acrylic resin, a soft resin whose glass transition point (Tg) is set in the range of −50 ° C. to + 30 ° C., preferably −50 ° C. to 0 ° C. is used, and −20 ° C. to −40. Those at ℃ are particularly preferable.
This makes it possible to cover the cracks on the concrete surface and impart a waterproof function.

As the filler, silica sand, silica stone powder, clay, calcium carbonate, cold water sand, pumice powder, artificial lightweight material powder and the like are used. This filler is also called fine aggregate.

In the one-component type inorganic surface conditioning coating material having excellent storage stability of the present invention, the cement hydration reaction is performed on the main component composed of Portland cement, the acrylic resin aqueous emulsion, the filler and water as described above. A retarder is used, and at least two of alcohols, ligninsulfonic acid, and zinc oxide are used as the retarder. This stabilizes the mixture in water during storage,
The pot life can be extended, the mixing work of each raw material is required on the site, the planned production in the factory and the immediate use on the site can be achieved, and the coating finish without causing early curing. It is effective because it can secure the physical properties of the subsequent coating film.

As the alcohol, use of methanol, ethanol, propanol, butanol, benzyl alcohol, pentadiol monoisobutyrate, etc. can be considered. However, from the viewpoint of dry curing of the coating material and storage stability, it has a direct carbon number of 1-5. Chain or branched aliphatic alcohols such as (iso) propanol, butanol are useful. still,
These alcohols act as a cement hydration reaction retarder and have a function of promoting film formation of the emulsion resin. The amount of alcohol used is 3 to 20 parts by weight based on 100 parts by weight of cement.

Lignin sulfonic acid is 0.3 to 1.0 part by weight with respect to 100 parts by weight of cement, and zinc oxide is 3 to 10 parts by weight.
Used in parts by weight parts. In order to satisfy both the storage stability of the material and the performance after construction, it is necessary to use at least two kinds of the retarding agents together rather than using them alone.

Various additives may be added to the surface conditioning coating material of the present invention in addition to these components. For example, glycol, aliphatic hydrocarbon, or aromatic hydrocarbon can be used as the solvent or dispersant.

As the glycols, ethylene glycol is particularly preferable. Aliphatic and aromatic hydrocarbons are effective in preventing surface cracks and are effective in terms of finish quality.

A nonionic activator can be used as an additive for uniformly mixing cement and filler and improving dispersibility. For example, sorbitol ester, polyoxyethylene alkyl ether, polyoxyethylene allyl ether, etc. can be used.

In addition to these, generally used antifoaming agents or preservatives such as silicone type and fatty acid type are also usually added.

[0021]

[Examples] Examples in which various surface conditioning coating materials of the present invention were prepared by using the respective components and the performances thereof were measured are shown below. Examples 1-1 to 1-4 and Comparative Examples 1-1 to 1-4 First, the combination of cement hydration reaction retarders and those with different addition amounts were prepared in the proportions as shown in Table 1 and manufactured. When the performances such as storage stability were measured together with Comparative Examples 1-4 containing no retarder, the results shown in the evaluation results in Table 1 were obtained. The acrylic resin aqueous emulsion used had a solid concentration of 50% and a glass transition point of -40 ° C. This coating material is usually applied to a thickness of 2 mm.

[0022]

[Table 1]

As is clear from Table 1, all of the cement hydration retarders of the present invention used in combination of two or more have a storage stability of one month or more, one of which (Example 1 -1) except for all (Examples 1-2 to 1-
4) It has a storage stability of 6 months or more, and is hardened at 20 ° C. for about 6 to 8 hours after construction, and has early dry hardening property and water resistance. However, the case where only one type of cement hydration reaction retarder was used (Comparative Examples 1-1 to 1-3) was 1
It has a problem in practical use because it shows only storage stability on the order of days or is inferior in dry curing and water resistance. Thus, according to the one-component type inorganic surface conditioning coating material having excellent storage stability of the present invention, a liquid one-component inorganic surface conditioning coating material having the property of polymer cement is obtained. It was confirmed. On the other hand, the polymer cement mortar according to Comparative Example 1-4 containing no retarder was solidified one day after the preparation.

Examples 2-1 to 2-6 and Comparative Example 2-1 Next, the same amount of cement hydration reaction retarder was contained, but the ratio of cement to filler (hereinafter, simply "C / G"). A coating material having a composition as shown in Table 2 different from that of Example 1-1 was prepared, and the same performance as in Example 1-1 was measured to obtain the results shown in the evaluation results of Table 2. Here, as the filler, a silicic acid filler such as silica sand or a calcium carbonate filler is used. Comparative Example 2-1 is a two-component type commercially available cement filler containing no retarder.

[0025]

[Table 2]

As is clear from Table 2, C / G is 1
No. 1 (Example 2-1) had a tendency to slightly crack during finishing, but had good curability and adhesive strength, and the filler was required to be equal to or more than the cement, that is, about 1/1 or more. It was found to be. Those having a ratio C / G of 1/3 (Examples 2-2, 2-4, 2-5, 2-6) all have good performance and strength, and have a ratio of 1/5 ( In Example 2-3), the strength value is lower than that of a general polymer cement-based undercoating coating material, and although it has a small function as a polymer cement, there is no problem in dry hardening or cracking, and therefore, it is preferably up to about 1/5. I understood.

Thus, from the comprehensive evaluation of workability, curability, dry cracking, water resistance, and adhesive strength, C / G is 1/1 to 1/1.
The range of 1/5 is preferable, and the range of 1/2 to 1/3 is particularly desirable. The commercially available undercoating material used as Comparative Example 2-1 has no problem in the performance of the coating layer, but it must be compounded on site because of the two agents, and the pot life after compounding is about 1 hour. There was a difficulty in construction work, such as only one.

Examples 3-1 to 3-4 and Comparative Examples 3-1 to 3-1
3-2 Next, the cement / polymer ratio (hereinafter simply “C /
(Abbreviated as “P”) was prepared and coating materials having the compositions shown in Table 3 were prepared, and the results of measuring the performance thereof are shown in the evaluation results of Table 3. Further, as a comparative example 3-1, a commercially available cement filler,
As Comparative Example 3-2, a similar test was conducted using a one-pack type commercially available organic filler, and the evaluation results are shown in Table 3.

[0029]

[Table 3]

As for the polymer, coating materials having various C / P ratios were prepared by using an acrylic resin aqueous emulsion having a concentration of 50%. When the C / P ratio is 0.5 (Example 3-1), a slight tendency of cracking is observed in the durability test, but there is no problem in use, and the C / P ratio is 2 (Example 3-2). 5
In the case of (Example 3-3), all show good performance,
When the C / P ratio is 10 (Example 3-4), the effect of cement is somewhat insufficient, and although water resistance and strength are slightly reduced, there is no problem in actual use. Thus, the C / P ratio is 1 / 0.5 to 1/10, especially 1/2 to 1
A range of / 5 is preferred.

The polymer cement-based commercially available cement filler used in Comparative Example 3-1 has problems in workability, water absorption, water permeability, and the like, and the one-component organic filler in Comparative Example 3-2 has water resistance. It is clear that there are many problems in terms of performance such as insufficient properties, insufficient adhesive strength after low temperature and water resistance tests, and cracking.

[0032]

As is clear from the above description, the one-component type inorganic surface conditioning coating material of the present invention excellent in storage stability is
A Portland cement, an acrylic resin aqueous emulsion, a filler, and at least two kinds of cement hydration reaction retarders selected from the group consisting of alcohol, ligninsulfonic acid and zinc oxide were mixed in advance to prepare a one-pack type. Therefore, it has a storage stability of 6 months or more after production in the factory, and it can be used immediately without the need for compounding work on site, so it does not cause the formation of lumps and can be used at an early stage. A material which was dried and cured and was as excellent as the conventional two-component cement-based surface conditioning coating material in terms of performance such as water resistance, adhesive strength, and weather resistance was obtained.

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-5-65427 (JP, A) JP-A-62-207748 (JP, A) JP-A-61-106870 (JP, A) JP-A-60- 94470 (JP, A) JP 60-195049 (JP, A) JP 58-147447 (JP, A) JP 60-7972 (JP, A) JP 62-265395 (JP, A) JP-A-5-262548 (JP, A) JP-A-1-141861 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C09D 1/08 C09D 133/00-133/26 C04B 22/00-28/36

Claims (4)

(57) [Claims] 1. Portland cement and acrylic resin water
And sex emulsion, a filler, an alcohol, at least two selected from the group of lignin sulfonic acid and zinc oxide
Premixed with a cement hydration retarder of a class
One-pack type with excellent storage stability, characterized by being prepared
Inorganic surface conditioning coating material. 2. The ratio of cement to filler is in the range of 1/1 to 1/5, and the ratio of cement to acrylic resin emulsion (50% concentration) is in the range of 1 / 0.5 to 1/10. The one-pack type product excellent in storage stability according to claim 1,
Mechanical surface adjustment coating material. Wherein the acrylic resin aqueous emulsion, -50
Acrylic resin having a glass transition point in the range of 30 ° C to + 30 ° C
The aqueous emulsion of fat according to claim 1 or 2.
A one-component inorganic surface conditioning coating material with excellent storage stability . 4. Alcohol has a straightness or a fraction of 1 to 5 carbon atoms.
Storage stability according to claim 1, which is a variety of aliphatic alcohols.
A one-component inorganic surface conditioning coating material with excellent qualitative properties .