KR20110049219A - Silane or siloxane water repellent coated by mineral - Google Patents

Abstract

PURPOSE: A water repellent is provided to impart excellent water repellency in the blending with cement and to suppress the neutralization of mortar and environmental contamination according to neutralization. CONSTITUTION: A water repellent is such that at least one resin selected from the group consisting of a silane- or siloxane-based resin is coated with mineral. The mineral is one or more porous minerals selected from the group consisting of silicate mineral, lime mineral, and clay mineral. A method for preparing the water repellent comprises the steps of: (i) mixing at least one resin selected from the group consisting of a silane- or siloxane-based resin into a solvent to prepare a mixed solution; and (ii) spraying the mixed solution to the mineral.

Description

Water repellents coated with minerals of silane- or siloxane-based resins {Silane or siloxane water repellent coated by mineral}

The present invention relates to a water-repellent agent coated with a mineral of at least one resin selected from the group consisting of silane-based and siloxane-based and a method for producing the water-repellent agent.

The protection of cement composition using water repellent is applied not only in the road industry but also in the construction field such as apartments and public facilities, and in the marine port field such as breakwater, bridges and bridges. In particular, there has been a need for the protection of structures due to the recent cracking of roads, the destruction of concrete supports on the side of railway rails, and the collapse of large department stores. Therefore, various attempts have been made for the protection of cement structures. Among them, the construction of coating-type water repellents and permeable water repellents for exterior protection has been mainly made.

However, in the post-treatment process as described above, it is difficult to apply to complex structures, and there are limitations on use depending on the shape of the structure. Water repellent coatings are limited to the outside, so physical defects such as cracking or partial destruction due to physical force are caused. When it occurs, water repellency is lost, so that it is easy to infiltrate moisture, and due to this, neutralization and cracking occur, which seriously causes concrete to fall off.

In addition, in the case of the existing additive-type water repellent, the protective film and the encapsulation are not encapsulated in the water repellent, so they are collected by one side due to the repulsive force with water. There was a disadvantage that it does not have, there is a problem that agglomeration phenomenon of the water repellent occurs or the water repellent is not dispersed if not coated with mineral fog.

Accordingly, the present inventors can provide excellent water repellency by using at least one resin selected from the group consisting of silane-based and siloxane-based protective coatings when added to the cement mixture, and suppressing the neutralization of mortar. In addition, the present invention was completed by confirming that it can be used for breakwaters or exterior walls such as rivers, rivers and seas, and in particular, can suppress environmental pollution due to neutralization.

Therefore, an object of the present invention is to provide a water-repellent agent coating a mineral coating of at least one resin selected from the group consisting of silane and siloxane.

In another aspect, the present invention provides a method for producing a water-repellent agent comprising the steps of (a) mixing at least one resin selected from the group consisting of silane and siloxane in a solvent to prepare a mixed solution and (b) spraying the mixed solution on a mineral; It aims to do it.

In order to achieve the above object, the present invention provides a water repellent coating the mineral coating of one or more resins selected from the group consisting of silane and siloxane.

In another aspect, the present invention provides a method for producing a water repellent agent comprising the steps of (a) mixing at least one resin selected from the group consisting of silane and siloxane in a solvent to prepare a mixed solution and (b) spraying the mixed solution on a mineral to provide.

Hereinafter, the present invention will be described in more detail.

The water-repellent agent of the present invention is characterized in that at least one resin selected from the group consisting of silane-based and siloxane-based coatings with minerals.

The at least one resin selected from the group consisting of silane and siloxane is usually selected from silane resins or siloxane resins used as water repellents. For example, products commonly used as silane-based water repellents are isobutyl trimethoxy (or ethoxy) silane, isooctyl trimethoxy (or ethoxy) silane and the like. The siloxane-based water repellent includes siloxane oligoma and polysiloxane.

The mineral is not limited thereto, but may preferably be a porous mineral, more preferably the porous mineral may be at least one selected from the group consisting of silicate minerals, lime minerals and clay minerals, and most preferably the porous minerals may be Zeolite, calcium sulfate and kaolin may be one or more selected from the group consisting of.

When a water-repellent agent coated with minerals of one or more resins selected from the group consisting of silane- and siloxane-based compounds of the present invention was added to the composition of cement, the water repellency was confirmed to be excellent compared to the case where no water-repellent was added, and the structure was neutralized. By preventing, it was confirmed that a structure excellent in water repellency can be easily manufactured.

As a result of measuring the water absorption of the mortar block prepared by adding 0.5% or 1% of the water repellent agent of the present invention and the mortar block without the water repellent agent, 8.16% of water after 30 minutes in water was not added. However, when the water repellent of the present invention was added to the water repellent of 0.5% and 1.0% of the addition of 1.43% and 0.68% of the water absorbed showed excellent water repellency. In addition, when the pH of the water was measured after 1 hour after the block was immersed in water, the pH was increased by 4.5 when the water repellent was not added. However, when the water repellent of the present invention was added, the pH was increased by only 1.0. It was confirmed to be effective in prevention.

The water-repellent agent of the present invention by producing at least one resin selected from the group consisting of silane-based and siloxane-treated with a protective coating using minerals and by using as an additive when mixing the mortar by showing a perfect water repellency even when the structure is partially damaged It is to give excellent water repellent function to both inside and outside.

In one embodiment of the present invention was confirmed that the block absorbs water in the water after breaking by applying external force to the mortar block to which the water repellent of the present invention is added or not added, when 1% of the water repellent is added Absorption of water at all showed perfect water repellency.

In addition, when the water repellent of the present invention is used, there is no need for an additional process according to the water repellent treatment and there is no limitation in the application according to the shape of the structure.

The present invention also provides a method of preparing a water repellent by spraying a mineral mixture of at least one resin selected from the group consisting of silane and siloxane, and a solvent to a mineral. Method for producing a water-repellent agent of the present invention comprises the steps of preparing a mixed solution by mixing at least one resin selected from the group consisting of silane-based and siloxane-based solvent and (b) spraying the mixed solution to the mineral It is done.

The water repellent of the present invention is a protective material for logistics, distribution centers, factories, warehouse floors, building exteriors and roadsides, water and sewage concrete structures, subways, rooftops, parking lots, waterproof materials for concrete water pipes, swimming pools, stadiums, restaurants, gas stations, etc. It can be applied to the repair and reinforcement of concrete surface, reinforcement base of wood, adhesive reinforcement of base adjuster, concrete building and structure protection material of seaside city where flame resistance is required, reinforcement of concrete adhesion of structural joint, red brick, natural stone marble, etc. It is not limited to this.

According to the present invention, when one or more resins selected from the group consisting of silanes and siloxanes are treated with a protective coating and added to cements, they can be used to impart excellent water repellency and suppress the neutralization of mortar. It can also be used for breakwaters and exterior walls such as rivers and seas, and it can be used in all areas of society as it can suppress environmental pollution caused by neutralization.

The present invention provides a method for preparing a mineral coating water-repellent agent comprising the following steps:

 (a) mixing at least one resin selected from the group consisting of silane and siloxane in a solvent to prepare a mixed solution, and (b) spraying the mixed solution on minerals.

Preferably, the solvent includes all solvents capable of dissolving one or more resins selected from the group consisting of naphtha or isoparaffin, silane and siloxane, and the weight ratio of the resin and the solvent is 1: 3 to 1: 9. Preferably, the mineral is a mineral that is thermally decomposed to 100-700 ° C. to be pulverized to 50 μm or less. The mixed solution may be sprayed onto the pulverized mineral and then dried at low temperature to 100 ° C. or lower to obtain a powder. Preferably the weight ratio of mineral to mixed liquor is 10: 5 to 10: 8.

That is, the manufacturing method of the present invention is carried out in the following steps. Prepare a mineral in powder form. Prepare silane and siloxane solids (30-50%). The silane or siloxane compound is diluted in a solvent such as Naphtha and isoparaffin in a weight ratio of 1: 3 to 1: 9. Mineral particles are added to the mixer, the dilute solution is continuously sprayed onto the mineral, and then dried at low temperature for 100 ° C. for a certain time, and then pulverized to obtain a water-repellent powder having a certain size. The ratio of mineral to diluent solution is 10: 5 to 10: 8 by weight.

The water repellent of the present invention prepared as described above is encapsulated and protected by minerals to minimize the repulsion with water when forming a cement structure to prevent the water repellent from biasing to one side and to be mixed homogeneously with the cement. That is, the protective coating of minerals controls the timing of eluting at least one resin selected from the group consisting of silane and siloxane in the protective coating upon reaction with water, and the protective coating completely dispersed in the process of curing through the reaction of cement. In the treated capsule, one or more resins selected from the group consisting of silane and siloxane are dissolved with concrete by elution, thereby imparting water repellency to the outside and the inside (FIG. 2). In the following examples, comparative examples and experimental examples confirmed the excellent water repellency of the water repellent of the present invention.

Preparation Example 1

Silane resin solids (40%) were diluted in a naphtha solvent at a weight ratio of 1: 5. The zeolite in powder form was added to the mixer, and the diluted solution was continuously sprayed onto the zeolite, followed by drying at low temperature below 100 ° C. The ratio of mineral to solution was 10: 6 by weight. A powder of a certain size was obtained by a grinder.

Production Example 2

The siloxane resin solids (40%) were diluted in isoparaffin (Naphtha) solvent at a weight ratio of 1: 5. Kaolin in powder form was added to the mixer, and the diluted solution was continuously sprayed on kaolin, and then dried at a low temperature below 100 ° C. The ratio of mineral to solution was 10: 6 by weight. A powder of a certain size was obtained by a grinder.

Production Example 3

The siloxane resin solids (40%) were diluted in isoparaffin (Naphtha) solvent at a weight ratio of 1: 5. Calcium sulfate in powder form was added to the mixer, and the diluted solution was continuously sprayed on calcium sulfate, followed by drying at low temperature below 100 ° C. The ratio of mineral to solution was 10: 6 by weight. A powder of a certain size was obtained by a grinder.

Example  One.

30 g of Falkland cement, 70 g of sand, and a small amount of water were mixed, and 0.5 g of the water repellent of Preparation Example 1 (0.5% solids weight ratio) was added thereto, mixed, and cured for 7 days to prepare a mortar block.

Example 2.

Mortar blocks were prepared in the same manner as in Example 1, except that 1g (solid weight ratio 1%) was added instead of 0.5g (solid weight ratio 0.5%) of the water repellent agent of Preparation Example 1.

Example  3

Mortar in the same manner as in Example 1 except for adding 2g (2% by weight of solids by weight) instead of 0.5g (0.5% by weight of solids) of a water-repellent agent coated with minerals of at least one resin selected from the group consisting of silane and siloxane. Blocks were prepared.

Comparative Example 1.

Mortar blocks were prepared in the same manner as in Example 1, except that the water repellent of Preparation Example 1 was not added.

Experimental Example  One.

The water repellent function was confirmed by measuring the water absorption of the mortar blocks of Examples 1 to 3 and Comparative Example 1. 500 cc of tap water was added to four beakers, and mortar blocks of Examples 1 to 3 and Comparative Example 1 were deposited, respectively, and water uptake was measured over time (total average of 10 measurements).

As a result, in the case of the mortar blocks of Examples 1, 2 and 3 to which at least one resin selected from the group consisting of silanes and siloxanes of the present invention was coated with minerals, the mortar blocks of Examples 1, 2, and 3 were immersed in water even after 30 minutes. The weight was increased by 2g, 1g and 1g, respectively, compared to the comparative example of 10g increased water absorption was very low, it was confirmed that the excellent water repellency (Table 1, Figures 3 and 4).

Experimental Example Initial weight (g) Weight after 10 minutes (g) Weight after 30 minutes (g) Water absorption (%) Comparative Example 1 (0%) 147 158 157 8.16 Example 1 (0.5%) 140 142 142 1.43 Example 2 (1.0%) 147 148 148 0.68 Example 3 (2.0%) 147 148 148 0.68

Experimental Example  2.

The degree of neutralization by water of the mortar blocks of Example 1, Example 2, and the comparative example 1 was confirmed. 500 cc of tap water was added to three beakers, and mortar blocks of Examples 1, 2 and Comparative Example 1 were respectively deposited, and the pH of the water in the beaker was measured using litmus paper over 10 times. ).

As a result, the mortar block of Comparative Example 1 was measured to pH 12, which increased to 4.5 after 60 minutes, and was very alkaline, whereas the mortar block of Examples 1 and 2 was increased to pH 8 after 1 minute of 60 minutes. Was measured. That is, in the mortar block of Comparative Example 1, the water infiltrated and the alkali component was eluted to alkalinize the water in the beaker, and thus, the neutralization of the mortar block occurred. As confirmed, the water repellency was excellent and the neutralization was suppressed by hardly penetrating water (Table 2, Figs. 5 and 6).

Experimental Example PH after 10 minutes PH after 30 minutes PH after 60 minutes Comparative Example 1 7.5 10 12 Example 1 7 7.5 8 Example 2 7 7.5 8

Experimental Example  3.

The mortar blocks of Example 1, Example 2 and Comparative Example 1 were subjected to external force and then destroyed to test the water repellent function inside the blocks. 500 cc of tap water was added to three beakers, and mortar blocks of Example 1, Example 2, and Comparative Example 1 were deposited, respectively, and water absorption was measured over time (total measurement was performed 10 times to represent an average value).

As a result, in the case of the block of Comparative Example 1, after the initial weight was 60 g to 30 g, 4 g of water was absorbed to 64 g, showing an absorption rate of 6.6%. On the other hand, Example 1 added 0.5% of the water repellent of the present invention absorbed 2.0% of water, Example 2 added 1% of the water repellent was confirmed to not absorb water because the weight after 30 minutes is the same as the initial weight Excellent water repellency

From the results of Examples 1 to 3, when adding a water-repellent agent coated with a mineral to the composition of the cement of one or more resins selected from the group consisting of the silane-based and siloxane-based of the present invention compared to the case where the water-repellent is not added The excellent water repellency was confirmed, and even when the structure was prevented from being neutralized, even when the structure was partially damaged, the water repellency was shown to be perfect, thereby making it possible to easily manufacture a structure having excellent water repellency.

1 is an optical microscope photograph of a water repellent agent coated with a mineral of one or more resins selected from the group consisting of silane and siloxane compounds of the present invention ((A): 50 times enlarged photograph, (B): 200 times enlarged photograph ).

FIG. 2 schematically shows a mechanism in which a water repellent and a mortar in which at least one resin selected from the group consisting of silane and siloxane compounds of the present invention are coated with minerals are combined.

Figure 3 is a graph showing the results of Experimental Example 1, Figure 4 is a photograph of the mortar state after 30 minutes in Experimental Example 1.

5 is a graph showing the results of Experimental Example 2, Figure 6 is a photograph of litmus paper measuring the pH after 60 minutes in Experimental Example 2.

Claims (5)

A water-repellent agent coating a mineral coating of at least one resin selected from the group consisting of silane and siloxane. The method of claim 1, The mineral is a water repellent is at least one porous mineral selected from the group consisting of silicate minerals, lime minerals and clay minerals. (a) preparing a mixed solution by mixing at least one resin selected from the group consisting of silane and siloxane in a solvent; And (b) spraying the mixed solution on the mineral; manufacturing method of a water repellent comprising a. The method of claim 3, The weight ratio of the resin and the solvent is 1: 3 to 1: 9 method of producing a water repellent. The method of claim 3, The weight ratio of the mixed solution and the mineral is 10: 5 to 10: 8 method of producing a water repellent.

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