JP6497633B2 - Aqueous treatment agent on inorganic porous material surface and vegetation control method - Google Patents

Description

  The present invention relates to an aqueous treatment agent and a vegetation control method for a surface of an inorganic porous material exposed to an outdoor environment.

Here, examples of the inorganic porous material include cement / concrete products, gypsum products, calcium silicate plates, tiles, bricks, and stones.
In the following description, the blending / composition unit is a mass unit unless otherwise specified.

  The exterior surface of a building made of inorganic porous material such as concrete is exposed to the outdoor environment, and due to surface pores, dust, mud, oil and fat components, acidic components, organic matter, spores, seeds, etc. are contained along with moisture. Since it easily invades, it becomes a culture medium for vegetation. For this reason, over time, vegetation grows on the outer surface of the building and damages the landscape of the building.

  For this reason, various operations such as herbicide spraying for controlling vegetation on the building surface were necessary. Many herbicides are highly toxic and are harmful to human livestock. When herbicides diffuse and flow out, they can cause environmental pollution and have a relatively short control effect on the vegetation (for example, several months). ~ 1 year), and it was necessary to carry out every 1-2 years.

  Therefore, without using a herbicide, it is possible to easily control the vegetation on the outer surface of the building (the surface of the porous material), and to maintain the effect for a long period of time. A method is sought after.

However, the present inventor is not well aware of such an aqueous treatment agent and vegetation control method on the surface of the inorganic porous material.
Similar to the present invention, techniques for surface modification of an inorganic porous material such as concrete using an alkali silicate aqueous solution are described in Patent Documents 1 to 3 as follows. None of them are aimed at controlling vegetation, and the composition of the treatment agent is also different.

Patent Document 1 (Summary, etc.): “By vitrifying a vitrification liquid (alkali silicate-containing liquid) into the surface of a member formed using a cement-based finishing material such as concrete or mortar, the surface of the member is made vitreous. A method of converting and polishing the vitreous surface. ",
Patent Document 2 (Summary, etc.) “Contains a water-soluble alkali silicate compound and an acrylic resin having a silanol group or a group that can be converted into a silanol group for the purpose of wet curing, dust prevention, strengthening, etc. of a calcium-based substrate. , Calcium-based inorganic base material coating composition. "
Patent Document 3 (summary, etc.) states that “an aqueous permeable composition containing sodium silicate and potassium methylsilicate for the purpose of applying to a concrete surface and imparting water repellency as well as surface strengthening”.

JP 2002-308680 A JP 2003-119429 A JP 2004-256350 A

  The present invention provides an aqueous treatment agent and a plant on the surface of an inorganic porous material that can easily control the vegetation on the outer surface of the building (the surface of the porous material) without using a herbicide and can maintain the effect for a long period of time. The purpose (problem) is to provide a biological control method.

  The aqueous treatment agent according to the present invention is an aqueous treatment agent applied to the surface of an inorganic porous material, and contains an alkali silicate as a main component and a water-soluble fluoride and a silicone-based water repellent as auxiliary components. It is characterized by this.

  The method for controlling vegetation on the surface of an inorganic porous material according to the present invention includes an aqueous treatment agent containing an alkali silicate as a main component and a water-soluble fluoride and a silicone-based water repellent as auxiliary components on the inorganic porous surface. It is characterized by applying.

  Specifically, the inorganic porous material to which the aqueous treatment agent of the present invention is applied includes concrete buildings and structures, cement / concrete products, gypsum products, calcium silicate boards, tiles, bricks, stone materials (tombstones, etc.), It refers to ceramics that absorb water (tile), etc., and means a surface material that can be a medium that can inhabit vegetation.

  As described above, the aqueous treatment agent according to the present invention is an aqueous treatment agent applied to the surface of an inorganic porous material. The aqueous treatment agent comprises an alkali silicate (A) as a main component, a water-soluble alkali fluoride and a silicone-based repellent agent. A liquid medicine is contained as a subcomponent (functional component).

(A) Alkali silicate (water glass, silicate)
It is represented by the general formula M ₂ O · nSiO ₂ (where n is a natural number, M: Na, K, or Li. Note that n varies depending on M and grade. For example, when M = Na, n = 3 to 3.3). Usually, it is supplied in the state of an aqueous solution. Specifically, various water glasses (aqueous solutions) marketed by Fuji Chemical Co., Ltd. and Nippon Chemical Industry Co., Ltd. can be obtained.

  It is desirable to use the alkali silicate concentration in the treatment agent within a range that does not impair the effect of the water repellent component in the surface cleaning agent, and if the amount is too small, the effect of filling the pores is reduced. The concentration of alkali silicate in the treatment agent is preferably 1 to 15%, more preferably 3 to 10%.

(B) Water-soluble alkali fluoride:
Examples of the water-soluble alkali fluoride include potassium fluoride (KF) and sodium fluoride (NaF), which may be used in combination.

  The concentration of the alkali fluoride in the aqueous treatment agent varies depending on the type of fluoride (reactivity and solubility with alkali silicate), but is preferably low from the viewpoint of safety. Preferably it is 0.2 to 5%, More preferably, it is 0.5 to 2.5%. Moreover, it is preferably 0.05 to 0.6 times, more preferably 0.1 to 0.3 times in terms of the magnification (ratio of alkali silicate) to alkali silicate (active ingredient).

When the inorganic porous material is Ca-based, fluoride F ⁻ and Ca ²⁺ exposed in the pores of the inorganic porous material react to form insoluble calcium fluoride as described below. Reinforces the pore-filling action of alkali silicate on the porous material.
Ca ²⁺ + 2F ⁻ → CaF ₂ ↓ (10)

  Further, when the fluorine ions are mixed with an alkali silicate solution and left in the air, the alkali silicate solution is accelerated to reinforce the pore filling action on the inorganic porous material.

(C) Water repellency imparting agent (water repellent, water absorption inhibitor)
The water repellency-imparting agent is compatible with the alkali silicate and the water-soluble fluoride in an aqueous medium and imparts water repellency to the surface of the inorganic porous material until the alkali silicate is completely cured (for example, It is not particularly limited as long as it can be maintained for about 6 months). That is, the coating is applied to impart water repellency so that the alkali silicate or fluoride after the coating is applied does not flow out of the wall.

For this reason, fluororesin-based glass repellents can be used, but the following (1) siliconate (alkali silicate alkali), (2) silicone oil, and silanes are desirable. In particular, in the atmosphere, siliconate (alkali silicate alkali or reaction) which forms a three-dimensional hard polysiloxane (silicone resin) by decarboxylation or dehydration condensation reaction with carbon dioxide (CO ₂ ) or moisture (H ₂ O) in the atmosphere. Silicone oils are particularly desirable because they have a low molecular weight, are not bulky, have good affinity (miscibility) with alkali silicates, and when applied to an inorganic porous surface, The outflow prevention action is large, and after curing, contributes to the increase in the surface strength of the inorganic porous material.

  That is, silanes, siliconates (alkali silicate alkalis) and silicone oils can be used alone or in combination. Here, the formation of the hard polysiloxane film on the inorganic porous surface is not inevitable, but a cross-linked (high-density three-dimensional bond) is desirable because it can ensure strength.

  Specifically, the following alkyl silicate alkali (siliconate) (1) and silicone oil (2) are desirable.

(1) Alkyl silicate alkali (siliconate):
Alkyl silicate alkalis having the following structural formula (1) are desirable because of their high compatibility with alkali silicates.
RSi (OH) ₂ OM (where R: CH _3, CH ₅ or C ₆ H ₅ , M: K or Na) (1)

Alkyl silicate alkali reacts with carbon dioxide in the presence of water to form a rigid polysiloxane having a three-dimensional (crosslinked) structure as described below.
2RSi (OH) ₂ OM + CO ₂ → M ₂ CO ₃ + cross-linked polysiloxane Examples of the alkyl silicate alkali include “POLON-C” from Shin-Etsu Chemical Co., Ltd. and “SILRES BS- 16 ”(all are sodium methyl silicate) can be used.

(2) Silicone oil It is desirable to use a polysiloxane having a molecular weight of 2000 or less, preferably 1000 or less, particularly a reactive polysiloxane.

  Specifically, as a product name such as “SILRES BC2101J” (a mixture of silane and siloxane) or “SILRES BC2103” (silicone emulsion) from Asahi Wacker Silicone Co., Ltd., a moisture curable silicone from Shin-Etsu Chemical Co., Ltd. “KR251, KR400, KR400F” marketed as oligomers (curing catalyst added products), and also as “POLON-MK206”, “POLON-MF30, 49” as water repellents. Things can be used. Similar products are also marketed by Toray Dow Corning, Momentive Performance Materials, and others.

  It is desirable to use the water repellent at a blending amount that does not dilute the alkali silicate concentration. Usually, the active ingredient is used in the range of 2 to 20 (preferably 5 to 15)%. It is preferably 0.5 to 6 times, more preferably 1 to 3 times in terms of the magnification (ratio of alkali silicate) to alkali silicate (active ingredient).

The aqueous treatment agent is prepared by mixing an alkali silicate, a water-soluble fluoride and a water repellent, and diluting with water to an appropriate viscosity. It is directly sprayed and applied to the surface of the porous material that is the surface to be treated (usually the surface of a building where vegetation is dense).
In addition, you may carry out in two steps, the 1st application process of the liquid mixture of an alkali silicate and an alkali fluoride, and the 2nd application process of a water repellent. This is because the alkali silicate and the alkali fluoride are easy to penetrate deeply into the inorganic porous surface pores.

  A buffering agent may be added to and mixed with the aqueous treatment agent of the present invention. In addition, the aqueous treatment agent of the present invention contains an arbitrary amount of thixotropic agent (anti-sagging agent) and thickener in order to prevent the phenomenon of rapid flow when applied to a vertical surface. You may add suitably.

  Furthermore, aqueous treatment of the porous material of the present invention with fine particles such as colorant, metal powder, fibrous substance, radioactive substance (for example, monasite) and photocatalytic substance (for example, titanium oxide, antimony oxide) as necessary. Can be mixed and used together with the agent.

Next, although the test example group which concerns on an Example is given together with a reference test example group, and it demonstrates in more detail, this invention is not restrict | limited at all by these Examples.
The test wall used in each test example was (a) concrete fence, (b) red tile roof, (c) tombstone, or (d) mortar board. In all cases, those with a vegetation life (grass, moss, etc.) on the surface were grown over 10 years after construction. The test site is Okinawa City, Okinawa Prefecture.

Moreover, the herbicidal / herbicidal evaluation test was conducted as follows.
After applying a predetermined amount of aqueous treatment agent (medicine) to each wall, the herbicidal effect is observed after 1 week, and the herbicidal effect is observed after each of 3 months, 6 months, 12 months, 24 months, and 36 months. And evaluated according to the following criteria. Note that the herbicidal effect was stopped after the evaluation of “×”.
(Weeding effect)
・ Yes: The grass was browned and died.
・ None: Not much changed.
(Weed control effect: vegetation generation suppression effect)
・ ◎: No generation of grass on the wall.
・ ○: Grass is hardly generated on the wall.
・ △: Grass etc. are rough on the wall.
-X: Grass and other surfaces are densely grown on the wall.

<Reference test group>
Tests for confirming (1) herbicidal effect (death effect) and (2) herbicidal effect (vegetation generation suppression effect) by using each component (drug) used alone in the present invention were conducted.

Each of the chemicals (aqueous chemicals) shown in Table 1 was spray-applied at a coating amount of about 160 g / m ² on the (a) concrete pot. Then, the herbicidal / herbicidal evaluation test described above was performed.

(1) Reference test example October group (alkali fluoride or alkaline fluoride earth):
In Reference Test Example 1-1 (KF aqueous solution), a herbicidal effect was observed after one week, and the effect of suppressing generation of grass and the like was up to 3 months. In Reference Test Example 1-2 (CaF ₂ aqueous solution), the herbicidal effect was hardly observed after 1 week, and the contaminating plant generation inhibitory effect was slightly observed up to 3 months, but not observed after 6 months.

(2) Reference test example group 2 (alkali silicate: water glass, silicate):
In each of Reference Test Example 2-1 (sodium silicate), Reference Test Example 2-2 (potassium silicate), and Reference Test Example 2-3 (lithium silicate), the herbicidal effect was observed, and the polluted plant generation suppression effect was observed. Was observed up to 3 months, but not after 6 months.

(3) Reference test example 3 group (water repellency imparting agent, hard polysiloxane forming agent)
In Reference Test Example 3-2, the herbicidal effect was observed, but in all of Reference Test Examples 3-1, 3-2 and 3-4, the herbicidal effect was hardly seen. In Reference Test Example 3-1 (silane-based water repellent) and Reference Test Example 3-3 (alkali silicate alkali (siliconate) -based water repellent), the plant generation inhibitory effect was slightly obtained up to 12 months. It was not seen at all when 24 months passed. In Reference Test Example 3-2 (siliconate-based water repellent) and Reference Test example (silicone-based water repellent), the effect of inhibiting the generation of contaminated plants was slightly observed up to 6 months, but was completely observed after 12 months. Was not.

From the above, it was found that the alkali fluoride and silicate, which are essential components of the present invention, can provide a herbicidal effect, but hardly provide a herbicidal effect, especially over a long period of time. In addition, although it is a short period of time to alkali fluoride (FK), it is estimated that the herbicidal effect is acquired to some extent because the fluorine ion which permeated the pores kills roots and seeds. In contrast, it is estimated that alkali ions kill only exposed vegetation.

<Example test example group>
The aqueous treatment agent of each Example was prepared by stirring and mixing each agent shown in Table 2 with the indicated composition. In addition, while showing the composition of each chemical | medical agent conversion to the active ingredient with respect to 100%, the active ingredient magnification of FK and water repellent with respect to alkali silicate (water glass) (active ingredient) is described in parentheses.

(1) First test group (herbicidal / herbicidal test):
(1) Weeding effect in each example, (2) In order to confirm the herbicidal effect, the test wall was (a) concrete fence, (b) red tile roof or (c) tombstone. Similar to the reference test example, the aqueous treatment agent was spray-coated so that the coating amount was about 160 g / m ² . And the above-mentioned weeding and herbicidal evaluation test was done about them.

  From Table 3 showing the evaluation results, in any of Examples 1 to 4, the vegetation cannot grow (wither) in any of the concrete fences, red tile roofs, and tombstones in which the vegetation is dense. The occurrence of vegetation was not observed even after 36 months from 3 months. That is, it was confirmed that any of the examples had a herbicidal effect and a long-term herbicidal effect.

These observation results in Table 3 can be said to far exceed the effects assumed from the observation results in Table 1.

(2) Second test group (wear test):
The following mortar boards and red roof tiles were prepared three by one, and the indicated amounts of the aqueous treatment agents of Examples 1 to 4 were spray applied to prepare wear test specimens.
-Mortar board: A plate (100 x 100 x 25 mm) prepared by pouring a mortar mixture with a weight ratio of Portland cement and river sand of 1: 3 into a mold for wear test and curing at room temperature for 28 days.
-Red tile: A plate-shaped body made by Naoko Hanahachi Co., Ltd. (cut into a plane size of 100 × 100 mm).

  The amount of wear (g) after 1000 revolutions was measured for each test specimen (three pieces each) using a taper-type wear tester (load: 0.5 kgf), and the average value of the three pieces was measured and the results are shown in Table 4. Show.

As a result of this test, the wear amount of any mortar board and red roof tile of Examples 1 to 4 was clearly less than that of a mortar board (blank) with no solution applied, and was given wear resistance. It has been found.

(3) Third test example group (water repellency test):
In order to verify the waterproofing effect of the aqueous treatment agent of the examples, each of the indications is applied to each mortar board, refractory brick (SK32), and granite coated bodies (all of which have a plane size of 100 × 100 mm). An aqueous treatment agent of the example was applied in an amount corresponding to 150 g / m ² to prepare three test specimens.
Each specimen was left together with each uncoated specimen for 7 days at room temperature, then exposed outdoors for 30 days, then immersed in water, taken out after 24 hours, and measured for water absorption (average value of 3). The water absorption ratio with respect to coating (uncoated as 100%) was determined.

From Table 5 showing the results, it was confirmed that even in the inorganic porous material having a high water absorption rate (Test Examples 9 and 10), the water absorption ratio was clearly reduced as compared with the uncoated material.
Furthermore, it was left outdoors and the presence or absence of water repellency was observed every 6 months, 12 months, 18 months and 24 months.
From Table 5 showing the observation results, it was confirmed that in all the examples, the water repellency can be sufficiently maintained for 6 months.

  From the above test results, the aqueous treatment agent of each example according to the present invention weeds (withered) the vegetation growing on the walls of the inorganic building, and thereafter, the generation of the vegetation is suppressed over a long period of time. It has been found that it has a landscape maintenance effect, and can further improve the surface wear and water absorption of cement porous mortar and highly porous inorganic porous materials such as red roof tiles.

  The method for applying the surface cleaning agent of the porous material of the present invention is to directly spray and apply (or immerse and impregnate the porous material in a state where vegetation is clustered or the surface of the naturally deteriorated porous material. In particular, it can be applied by simple methods such as brushing, spraying with a manual spray device (agricultural chemical sprayer), sprinkling with rain and dew, and immersion, and can be applied without the need for special equipment. .

  Moreover, the surface purification agent of the porous material of this invention can kill a vegetation by only spraying or spraying directly to the vegetation which grows, and has the herbicidal effect which cuts off the generation of the vegetation.

  Furthermore, the aqueous treatment agent of the present invention can be used not only for the surface of aged buildings where vegetation is dense, but also for outdoor porous materials such as concrete buildings and structures, cement products, stone products, brick fences, and tile roofs. If applied in advance, the generation of vegetation can be suppressed (having a herbicidal effect), and further, weathering and deterioration can be avoided.

Claims (6)

An aqueous treatment agent applied to the surface of an inorganic porous material,
It contains 1 to 15% of alkali silicate (active ingredient), 0.2 to 5% of water-soluble alkali fluoride (active ingredient) and 2 to 20% of water repellent (active ingredient), and magnification relative to the alkali silicate. Water-soluble alkali fluoride: 0.05 to 0.6 times, water repellent agent: 0.5 to 6 times.   The aqueous treatment agent according to claim 1, wherein the alkali silicate is one or more selected from the group consisting of potassium silicate, sodium silicate and lithium silicate.   The water-soluble alkali fluoride is one or both of potassium fluoride and sodium fluoride, and the water repellent is at least one selected from the group consisting of alkali alkylsilicates and reactive silicone oils. The aqueous treatment agent according to claim 1 or 2, characterized in that:   The aqueous treatment agent according to claim 3, wherein the alkali alkyl silicate is potassium methyl silicate.   A method for controlling vegetation on the surface of an inorganic porous material in which vegetation is generated, comprising alkali silicate 1 to 15% (active ingredient), water-soluble alkali fluoride (active ingredient) 0.2 to 5% and repellent While containing 2 to 20% of a liquid agent (active ingredient), the ratio to the alkali silicate is the water-soluble alkali fluoride: 0.05 to 0.6 times, the water repellent: 0.5 to 6 times A method for controlling a vegetation on the surface of an inorganic porous material, comprising applying the aqueous treatment agent to the inorganic porous surface, causing the vegetation to die, and removing the dead vegetation by rainwater or sprinkling. 6. The aqueous treatment agent is applied in two stages: a first application step of a mixed liquid of the alkali silicate and the alkali fluoride and a second application step of a water repellent agent. The vegetation control method of the inorganic porous material surface of description.