JP6594752B2 - Surface impregnating material and structure - Google Patents

Description

  The present invention relates to a surface impregnated material and a structure used for various construction works in the civil engineering and construction fields.

  Concrete and mortar, etc. used in various structures are inherently excellent in durability, but because they have pores, moisture, salt, carbon dioxide, etc. permeate through the pores depending on the structure and usage environment. , Some may deteriorate. Such deterioration causes a decrease in strength and a loss of the structure.

  A water absorption preventing material having an alkoxysilane has been disclosed for application to the surface of a structure having such pores to suppress or prevent the penetration of moisture, salt, carbon dioxide and the like.

JP 2003-221576 A JP 2009-280716 A

  However, when the construction surface of the structure having pores is a wall or ceiling, the applied material flows downward (sagging), so that the material falls as droplets when applied on the ceiling surface, and On the wall surface, there was a problem that the impregnation depth near the upper part was insufficient. In addition, in order to apply an appropriate amount, an operation process in which application is repeated several times is necessary. Furthermore, if the coating interval becomes long, the material may react to start forming a water-repellent layer, which may hinder deep penetration.

  The present invention has been made in view of the above circumstances, and it is possible to apply an appropriate amount in one application operation even if the construction surface is a wall or ceiling without changing the appearance of a structure such as concrete. It is an object of the present invention to provide a surface impregnating material that is capable of providing high permeability. Moreover, an object of this invention is to provide the structure excellent in durability.

  As a result of diligent studies to achieve the above object, the present inventors have obtained a surface by using a specific alkoxysilane, petroleum naphtha, a higher fatty acid amide, and a specific styrene-diene block copolymer. It has been found that the workability and permeability of the impregnating material can be improved, and the present invention has been completed.

That is, the present invention contains an alkoxysilane, petroleum naphtha, a higher fatty acid amide, and a styrene-diene copolymer. The alkoxysilane is represented by the following formula (1), and is based on 100 parts by mass of the alkoxysilane. The content of petroleum naphtha is 20 to 120 parts by mass, the content of higher fatty acid amide is 0.2 to 10 parts by mass, and the content of styrene-diene copolymer is 4 to 10 parts by mass. And a surface impregnation material in which the mass ratio of the styrene-diene copolymer to the total amount of the styrene-diene copolymer is 0.60 to 1.00.
R ¹ _n Si (OR ² ) _4-n (1)
(In the formula, R ¹ represents an alkyl group having 5 to 12 carbon atoms or a phenyl group, and n represents 1 or 2. When n is 2, R ¹ may be the same as or different from each other. R ² represents an alkyl group having 1 to 4 carbon atoms, and a plurality of R ² may be the same or different from each other.

  Even if the construction surface is a wall or a ceiling, the surface impregnating material of the present invention can be applied in an appropriate amount by a single application operation and has excellent permeability. That is, by applying the surface impregnating material of the present invention to the surface of a structure having pores such as concrete and mortar, a specific alkoxysilane penetrates deeply into the structure, and cement contained in concrete and mortar, etc. A water repellent layer is formed in the vicinity of the surface of the structure by reacting with components and the like, and penetration of moisture, salt, carbon dioxide and the like can be suppressed or prevented. It is considered that the reason why such an effect is obtained is that petroleum naphtha contributes to promotion of permeation of alkoxysilane from the surface while suppressing hydrolysis reaction of alkoxysilane. Further, when the surface impregnating material contains a higher fatty acid amide, an appropriate amount can be applied by a single application operation even if the construction surface is a wall or a ceiling. Furthermore, when the surface impregnating material contains petroleum naphtha, excellent permeability can be sufficiently maintained.

  The surface impregnating material of the present invention has a petroleum naphtha content of 20 to 120 parts by mass, a higher fatty acid amide content of 0.2 to 10 parts by mass, and a styrene-diene copolymer with respect to 100 parts by mass of alkoxysilane. Is 4 to 10 parts by mass. Thereby, the permeability of the surface impregnating material can be increased.

  In the surface impregnated material of the present invention, the mass ratio of the styrene-diene copolymer to the total amount of the higher fatty acid amide and the styrene-diene copolymer is 0.60 to 1.00. When a surface-impregnated material containing a higher fatty acid amide is applied to concrete, the higher fatty acid amide does not penetrate into the concrete but remains on the concrete surface, and the concrete surface may turn white. By adjusting the higher fatty acid amide and the styrene-diene copolymer to the above-mentioned mass ratio, whitening can be suppressed and appearance changes of structures such as concrete can be suppressed.

  In the surface impregnated material of the present invention, the viscosity of a 25 mass% toluene solution of a styrene-diene copolymer at 25 ° C. is preferably 100 to 30000 mPa · s. When the viscosity is 100 mPa · s or more, whitening of the coated surface by the higher fatty acid amide can be more sufficiently suppressed. On the other hand, when the viscosity is 30000 mPa · s or less, dissolution in alkoxysilane is further improved, and the permeability of alkoxysilane is further sufficient.

  In this invention, the structure obtained by apply | coating the surface impregnation material mentioned above to the structure surface is provided. Since the structure of the present invention has a water repellent layer formed by reacting with the surface impregnating material, it suppresses or prevents the penetration of moisture, salt, carbon dioxide, etc., and has a structure with excellent durability over a long period of time. Can be maintained.

  According to the present invention, even if the construction surface is a wall or a ceiling without changing the appearance of a structure such as concrete, it is possible to apply an appropriate amount in a single application operation. It is possible to provide a surface-impregnated material excellent in suppressing the above.

  Since the structure of the present invention reacts with the surface impregnating material to form a water-repellent layer near the structure surface, it suppresses or prevents the penetration of moisture, salt, carbon dioxide, etc., and has excellent durability over a long period of time. The structure can be maintained. Therefore, the structure of the present invention can contribute to reduction of life cycle cost.

<Surface impregnating material>
One embodiment of the surface impregnated material of the present invention will be described below. The surface impregnating material of this embodiment is a surface impregnating material used for applying to the surface of a structure having pores such as concrete and mortar, and includes alkoxysilane, petroleum naphtha, higher fatty acid amide, styrene- A diene copolymer.

  The alkoxysilane is an alkoxysilane represented by the following formula (1). By containing such alkoxysilane, a water repellent layer is formed in the vicinity of the surface of the structure having pores by reacting with cement components contained in concrete or mortar, etc., and penetration of moisture, salt, carbon dioxide, etc. Can be suppressed or prevented.

R ¹ _n Si (OR ² ) _4-n (1)

In formula (1), R ¹ represents an alkyl group having 5 to 12 carbon atoms or a phenyl group, and n represents 1 or 2. When n is 2, R ¹ may be the same as or different from each other. R ² represents an alkyl group having 1 to 4 carbon atoms, and a plurality of R ² may be the same as or different from each other. By having such R ¹ and R ² , the alkoxysilane penetrates deeply into the structure, and it becomes easy to form a water-repellent layer having good blocking performance.

  Specific examples of the alkyl group having 5 to 12 carbon atoms include a pentyl group, a hexyl group, an octyl group, a decyl group, and a dodecyl group. These may be linear, branched, or cyclic, but are preferably linear.

  Examples of the alkoxysilane represented by the formula (1) include hexyltrimethoxysilane, octyltrimethoxysilane, decyltrimethoxysilane, hexyltriethoxysilane, octyltriethoxysilane, decyltriethoxysilane, and dihexyldiethoxysilane. And alkyltrialkoxysilane and dialkyldialkoxysilane, and phenyltrialkoxysilane and diphenyldialkoxysilane such as phenyltrimethoxysilane, phenyltriethoxysilane, diphenyldimethoxysilane, and diphenyldiethoxysilane.

In the formula (1), n is preferably 1. By using an alkoxysilane in which n is 1, that is, an alkoxysilane having one R ¹ group and three OR ² groups, a hydrolysis reaction with a cement component contained in concrete or mortar easily occurs. Thus, it becomes easy to form a water-repellent layer near the surface of the structure.

  In the formula (1), as the alkoxysilane in which n is 1, alkyltrialkoxy such as hexyltrimethoxysilane, octyltrimethoxysilane, decyltrimethoxysilane, hexyltriethoxysilane, octyltriethoxysilane and decyltriethoxysilane Silanes and phenyltrialkoxysilanes such as phenyltrimethoxysilane and phenyltriethoxysilane.

  The molecular weight of the alkoxysilane represented by the formula (1) is preferably 190 to 340, more preferably 200 to 300. When the molecular weight of the alkoxysilane is in the above range, the balance between permeability and reactivity is further improved, and a better water-repellent layer is formed near the surface of the structure having pores, such as moisture, salinity and carbon dioxide. It can be expected to suppress or prevent the penetration.

  The impregnation depth of the mortar substrate impregnated with alkoxysilane is preferably 2.2 mm or more, more preferably 2.5 mm or more, further preferably 3.0 mm or more, and particularly preferably 3.5 mm or more. It is. The alkoxysilane used for the surface impregnation material is preferably selected to have such impregnation performance. Here, the impregnation depth is a value obtained in accordance with “6.2 Impregnation depth test” of “17. Test method of surface impregnated material (draft)” of JSCE K-571-2010.

  The water permeation suppression ratio of the mortar substrate impregnated with alkoxysilane is preferably 75% or more, and more preferably 80% or more. The alkoxysilane used for the surface impregnating material is preferably selected to have such a water permeation suppression ratio. Here, the water permeation suppression ratio is calculated by calculating the water permeation ratio (%) in accordance with “6.3 Water Permeability Test” in “17. Test Method for Surface Impregnated Material (Draft)” in JSCE K-571-2010. The value obtained by subtracting the water permeability ratio (%) from 100% is shown.

  Petroleum naphtha is a mixture of isoparaffins and normal paraffins having 9 to 14 carbon atoms. Petroleum naphtha acts as a penetration accelerator that penetrates the alkoxysilane deeply into the structure while suppressing the hydrolysis reaction of the alkoxysilane.

  The boiling point of petroleum naphtha is preferably 120 ° C. or higher, more preferably 130 ° C. or higher, and further preferably 140 ° C. or higher. When petroleum naphtha having a boiling point in such a range is used, volatilization can be sufficiently suppressed, and alkoxysilane can be deeply penetrated into the structure. The boiling point of petroleum naphtha is preferably 220 ° C. or lower, more preferably 210 ° C. or lower, and further preferably 200 ° C. or lower. When petroleum naphtha having a boiling point in such a range is used, the permeability of alkoxysilane can be improved.

  The content of petroleum naphtha is 20 to 120 parts by mass, preferably 30 to 110 parts by mass, more preferably 40 to 100 parts by mass, and still more preferably 50 to 100 parts by mass with respect to 100 parts by mass of alkoxysilane. 95 parts by mass. When the content of petroleum naphtha is within such a range, it becomes possible to improve the permeability of alkoxysilane.

  The higher fatty acid amide refers to a fatty acid amide having a long chain fatty acid having 12 or more carbon atoms. The fatty acid may be a saturated fatty acid or an unsaturated fatty acid.

  Carbon number of higher fatty acid amide becomes like this. Preferably it is 12-30, More preferably, it is 16-28, More preferably, it is 18-26, Most preferably, it is 20-24.

  Specific examples of the higher fatty acid amide include erucic acid amide, behenic acid amide, stearic acid amide, oleic acid amide, palmitic acid amide, myristic acid amide, lauric acid amide and the like. Suitable commercially available products include Neutron, BMT, PNT, SNT (all trade names, Nippon Seika Co., Ltd.), Diamond, Amide, Nikka Amide, Methylolamide (all trade names, Nippon Kasei Co., Ltd.), etc. Is mentioned.

  The content of the higher fatty acid amide is 0.2 to 10 parts by mass, preferably 0.3 to 6 parts by mass, more preferably 0.4 to 4 parts by mass with respect to 100 parts by mass of the alkoxysilane. Yes, more preferably 0.5 to 3 parts by mass. When the content of the higher fatty acid amide is in such a range, sagging when applied to the wall or ceiling can be sufficiently suppressed, and workability is improved.

  The higher fatty acid amide is preferably used by mixing a powdered higher fatty acid amide and a solvent described later to form a paste, that is, in a state having fluidity and viscosity. By using a higher fatty acid amide in the form of a paste, the dispersion state of the higher fatty acid amide is improved, and even when the construction surface is a wall or ceiling, the sagging of the surface impregnating material can be more sufficiently suppressed. Become. The pasty higher fatty acid amide may be a solution or a suspension (dispersion).

  The solvent is preferably one that can dissolve the powdered higher fatty acid amide. Specifically, for example, alcohols such as methanol, ethanol, isopropyl alcohol, n-butanol, isobutanol and benzyl alcohol; esters such as ethyl acetate and butyl acetate; aromatic hydrocarbons such as xylene; water and the like Can be used alone or in combination.

  The content of the higher fatty acid amide in the pasty higher fatty acid amide is preferably 1 to 50% by mass, more preferably 5 to 40% by mass, and still more preferably based on the total mass of the higher fatty acid amide and the solvent. Is 8 to 32% by mass.

  As the pasty higher fatty acid amide, a commercially available product can be used. Suitable commercial products include talen, flonon (both trade names, Kyoeisha Chemical Co., Ltd.) and the like.

  A styrene-diene copolymer is obtained by copolymerizing a styrene monomer and a conjugated diene monomer. Since the styrene-diene copolymer has high solubility in alkoxysilane, the viscosity of the surface impregnating material can be increased without hindering the action of alkoxysilane.

  Examples of the styrene monomer include styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, pt-butylstyrene, 2,4-dimethylstyrene, 2,4,6- Trimethylstyrene, monofluorostyrene, monochlorostyrene, dichlorostyrene and the like can be mentioned. These styrenic monomers can be used singly or in combination of two or more. Of these, styrene is preferably used.

  Examples of the conjugated diene monomer include butadiene (1,3-butadiene), isoprene, 1,3-pentadiene, 2,3-dimethyl-1,3-butadiene, 1,3-hexadiene, and the like. These conjugated diene monomers can be used singly or in combination of two or more. Of these, it is preferable to use 1,3-butadiene as the conjugated diene monomer.

  The styrene monomer used for producing the styrene-diene copolymer is not particularly limited, but is preferably 10 to 70% by mass, more preferably, based on the total mass of the styrene monomer and the conjugated diene monomer. Is 20 to 60% by mass, more preferably 25 to 50% by mass.

  Examples of styrene-diene copolymers include styrene-diene random copolymers and styrene-diene block copolymers. More specifically, for example, a styrene-butadiene random copolymer, a styrene-isoprene random copolymer, a styrene-butadiene block copolymer, a styrene-isoprene block copolymer, and the like can be given. Of these, it is preferable to use a styrene-butadiene block copolymer.

  Content of a styrene-diene copolymer is 4-10 mass parts with respect to 100 mass parts of alkoxysilanes, Preferably it is 5-9 mass parts, More preferably, it is 6-8 mass parts. When the styrene-diene copolymer is in such a range, sagging can be sufficiently suppressed in the surface-impregnated material.

  The styrene-diene copolymer may be in any shape such as pellets, crumbs, powders (powder), etc., but from the viewpoint of solubility in alkoxysilane described above, powders (powder) A crumb-like one is preferred.

  The viscosity of a 25% by weight toluene solution of a styrene-diene copolymer at 25 ° C. is preferably 100 to 30000 mPa · s, more preferably 130 to 25000 mPa · s, and further preferably 150 to 23000 mPa · s. Particularly preferably, it is 160 to 21000 mPa · s. Here, the 25 mass% toluene solution of the styrene-diene copolymer is a solution containing 25 mass% of the styrene-diene copolymer and 75 mass% of toluene based on the total mass of the toluene solution.

The viscosity at 25 ° C. of a 25 mass% toluene solution of a styrene-diene copolymer can be determined by the following method. First, a 25% by mass toluene solution of a styrene-diene copolymer is prepared. Next, the flow time of the toluene solution is measured at 25 ° C. Here, for the measurement of the flow time of the toluene solution, for example, an Ubbelohde improved viscosity tube / solution viscosity measuring device can be used. The viscosity at 25 ° C. of the toluene solution is calculated from the following formula from the flow time of the obtained toluene solution.
Ts ′ × Tc × 0.886 = viscosity of toluene solution at 25 ° C. (mPa · s)
(In the formula, Ts ′ represents the flow time (second) of the toluene solution, Tc represents the viscosity tube coefficient, and 0.886 is the specific gravity (g / cm ³ ) of toluene at 25 ° C.)

  The mass ratio of the styrene-diene copolymer to the total amount of the higher fatty acid amide and the styrene-diene copolymer is 0.60 to 1.00, preferably 0.63 to 0.98, more preferably 0. .66 to 0.95, and more preferably 0.70 to 0.93. When the mass ratio is in such a range, it is possible to suppress changes in appearance such as whitening.

  The surface-impregnated material of the present embodiment may further contain a solvent as a viscosity modifier in addition to the solvent used for pasting the higher fatty acid amide. When the surface impregnating material further contains a solvent, the viscosity of the surface impregnating material can be easily adjusted. Here, the same solvents as those exemplified as the solvent contained in the pasty higher fatty acid amide can be used. Among them, alcohols can be preferably used, and benzyl alcohol can be more preferably used.

  The content of the total solvent with respect to 100 parts by mass of alkoxysilane is not particularly limited, but is preferably 60 parts by mass or less, more preferably 50 parts by mass or less, and further preferably 40 parts by mass or less. Further, the content of the solvent may be 0.1 mass or more.

  The surface-impregnated material of this embodiment may contain other components in addition to alkoxysilane, petroleum naphtha, higher fatty acid amide, solvent and styrene-diene copolymer as long as the effects of the present invention are not significantly impaired. it can. Examples of other components include dyes.

  The viscosity of the surface impregnated material of the present embodiment at a rotation speed of 0.5 rpm at a temperature of 20 ° C. is not particularly limited, but is preferably 100 mPa · s or more, more preferably 200 mPa · s or more, and even more preferably 300 mPa · s. s or more, particularly preferably 500 mPa · s or more, and most preferably 600 mPa · s or more. This viscosity was measured using a BH viscometer with a rotational speed of 0.5 rpm and a rotor No. 3 is measured. When the viscosity is in such a range, sagging can be further suppressed even if the construction surface is a wall or a ceiling. The viscosity of the surface impregnating material at a rotation speed of 0.5 ° C. at a temperature of 20 ° C. is not particularly limited, but is preferably 20000 mPa · s or less, more preferably 15000 mPa · s or less, and further preferably 13000 mPa · s or less. Particularly preferably, it is 10,000 mPa · s or less.

  The viscosity of the surface impregnated material of the present embodiment at a rotation speed of 20 rpm at a temperature of 20 ° C. is not particularly limited, but is preferably 20 to 2000 mPa · s, more preferably 30 to 1200 mPa · s, and further preferably 40 to 40–. 1000 mPa · s, particularly preferably 50 to 800 mPa · s, and most preferably 60 to 750. This viscosity was measured using a BH viscometer with a rotation speed of 20 rpm and a rotor No. 3 is measured. When the viscosity is in such a range, sagging can be further suppressed even when the construction surface is a wall or a ceiling, and the workability is improved.

  The viscosity of the surface impregnated material of the present embodiment at a rotation speed of 100 ° C. at a temperature of 20 ° C. is not particularly limited, but is preferably 1000 mPa · s or less, more preferably 800 mPa · s or less, and even more preferably 600 mPa · s or less. It is particularly preferably 400 mPa · s or less, and most preferably 200 mPa · s or less. This viscosity was measured using a BH viscometer with a rotation speed of 100 rpm and a rotor No. 3 is measured. When the viscosity is in such a range, the workability and workability are improved even if the construction surface is a wall or a ceiling. The viscosity of the surface impregnated material at a temperature of 20 ° C. at a rotation speed of 100 rpm is not particularly limited, but is preferably 10 mPa · s or more, more preferably 30 mPa · s or more, and further preferably 50 mPa · s or more.

  The TI value (RPM0.5 / RPM100) at a temperature of 20 ° C. of the surface impregnated material is preferably 1 to 80, more preferably 3 to 60, still more preferably 5 to 40, and particularly preferably 10 to 10. 30. Here, the TI value is a value (ratio) obtained by dividing the viscosity obtained at the rotation speed of 0.5 rpm by the viscosity obtained at the rotation speed of 100 rpm in the above-described viscosity measurement, and represents a thixotropic coefficient. When the TI value of the surface impregnated material at a temperature of 20 ° C. is in the above range, sagging can be further suppressed, and the workability is further improved.

The coating amount of the surface impregnating material of the present embodiment is not particularly limited, but is preferably 100 to 500 g / m ² , more preferably 125 to 400 g / m ² by one coating on the structure surface. More preferably, it is 150 to 350 g / m ² . By applying at such an application amount, the balance between the above-described alkoxysilane permeability and sagging suppression is further improved, and the penetration of moisture, salt, carbon dioxide, etc. is sufficiently suppressed near the structure surface. A water repellent layer can be formed. Moreover, it is excellent also in workability.

The application amount of alkoxysilane applied by one application to the structure surface is not particularly limited, but is preferably 50 to 500 g / m ² , more preferably 75 to 400 g / m ² , Preferably it is 100-300 g / m < ² >.

  The method for producing a surface impregnated material according to this embodiment includes a first mixing step of mixing alkoxysilane and a higher fatty acid amide, and a second mixing step of mixing the mixture obtained in the first mixing step and the styrene-diene copolymer. And a third mixing step for mixing the mixture obtained in the second mixing step and petroleum naphtha, and a first mixing for mixing the alkoxysilane and the styrene-diene copolymer. A step, a second mixing step of mixing the mixture obtained in the first mixing step and the higher fatty acid amide, a third mixing step of mixing the mixture obtained in the second mixing step and petroleum naphtha, May be provided. The mixing in the first mixing step can be performed, for example, at normal temperature (for example, 25 ° C.) and 1 to 6 hours. The mixing in the second mixing step can be performed, for example, at normal temperature (for example, 25 ° C.) and 1 to 6 hours. The mixing in the third mixing step can be performed, for example, at normal temperature (for example, 25 ° C.) and 5 minutes to 6 hours. The stirrer used in these mixing steps is not particularly limited as long as it can be uniformly mixed and dispersed. For example, it is preferable to use a stirrer with high shearing force such as a dissolver.

<Structure>
The structure of the present embodiment can be obtained by applying the surface impregnating material described above to the surface of concrete, mortar or the like used in various structures. Since the structure of this embodiment has a water-repellent layer formed by reacting with the surface impregnating material, it suppresses or prevents the penetration of moisture, salt, carbon dioxide, etc., and has a structure with excellent durability over a long period of time. Can be maintained.

  The impregnation depth of the surface impregnating material in the structure of the present embodiment is preferably 2.2 mm or more, more preferably 2.5 mm or more, further preferably 3.0 mm or more, and particularly preferably 3. It is 5 mm or more. Here, the impregnation depth is a value obtained in accordance with “6.2 Impregnation depth test” of “17. Test method of surface impregnated material (draft)” of JSCE K-571-2010.

  The water permeation suppression ratio of the structure of the present embodiment is preferably 75% or more, and more preferably 80% or more. Here, the water permeation suppression ratio is calculated by calculating the water permeation ratio (%) in accordance with “6.3 Water Permeability Test” in “17. Test Method for Surface Impregnated Material (Draft)” in JSCE K-571-2010. The value obtained by subtracting the water permeability ratio (%) from 100% is shown.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  The contents of the present invention will be described in more detail below using examples and comparative examples. However, the present invention is not limited to the following examples.

(Experimental example 1)
[Materials used]
The alkoxysilanes 1-19 shown in Table 1 were prepared. Table 1, the hydrophobic group of the alkoxysilane (R ^1), the carbon number of the hydrophobic water group (R ^1), and are shown together molecular weight.

  The alkoxysilane of Table 1 was apply | coated to the mortar board | substrate surface with the application quantity shown in Table 2 using a brush, and the impregnation depth and the water-permeable suppression ratio were measured. The production method of the mortar substrate and the measurement method of the impregnation depth and the water permeation suppression ratio are as follows.

[Production of mortar substrate]
It was prepared according to “5.1.1 Preparation of Mortar Substrate” in “17. Test Method of Surface Impregnated Material (Draft)” of JSCE K-571-2010.

[Alkoxysilane Evaluation Method]
(1) Impregnation depth It was performed in accordance with “6.2 Impregnation depth test” of “17. Test method of surface impregnated material (draft)” of JSCE K-571-2010.
(2) Permeability suppression ratio Calculate the permeation ratio (%) based on “6.3 Permeability Test” in “17. Test Method of Surface Impregnated Material (Draft)” of JSCE K-571-2010. A value obtained by subtracting the water permeability ratio (%) was defined as a “water permeability suppression ratio”.

From Table 2, the alkoxysilanes 1 and 2 not having R ¹ did not satisfy both or one of the impregnation depth of 2.2 mm or more and the water permeation suppression ratio of 75% or more. Further, the alkoxysilane 3 to 9 R ¹ is an alkyl group or a vinyl group having 1 to 4 carbon atoms, impregnation depth 2.2mm or more and permeability suppression ratio did not meet one or both of 75% or more . In addition, alkoxysilanes 16 to 19 in which R ¹ is an alkyl group having a glycidoxy group or a methacryloxy group had a water permeation suppression ratio of 75% or more, but did not satisfy the condition of an impregnation depth of 2.2 mm or more.

From Table 2, alkoxysilane 10 to 15 ^{R 1} is an alkyl group or a phenyl group having 5 to 12 carbon atoms, impregnation depth 2.2mm or more and permeability suppression ratio meets the 75% or more of both conditions It was.

(Example 1, Comparative Example 1, Reference Example 1)
[Materials used]
The raw materials shown in the following (1) to (5) were prepared.

(1) Styrene-diene copolymer A: Styrene-butadiene block copolymer (mass ratio of styrene and butadiene: 30/70, viscosity of 25% by weight toluene solution at 25 ° C .: 20200 mPa · s, shape: powdery )
B: Styrene-butadiene block copolymer (mass ratio of styrene and butadiene: 30/70, viscosity of 25 mass% toluene solution at 25 ° C .: 3100 mPa · s, shape: powder)
C: Styrene-butadiene block copolymer (mass ratio of styrene and butadiene: 30/70, viscosity of 25 mass% toluene solution at 25 ° C .: 1700 mPa · s, shape: powder)
D: Styrene-butadiene block copolymer (mass ratio of styrene and butadiene: 45/55, viscosity of 25% by weight toluene solution at 25 ° C .: 170 mPa · s, shape: pellet form)
(2) Polymer other than styrene-diene copolymer E: Maleic anhydride modified 1-propene-1-butene copolymer (shape: powder)
F: alkyl acetalized polyvinyl alcohol (viscosity at 25 ° C. of a 10 mass% ethanol-toluene (1: 1) solution: 115 mPa · s, shape: powder)
(3) Petroleum naphtha (boiling point 170 ° C)
(4) Higher fatty acid amide paste (higher fatty acid amide: C22, mass ratio of higher fatty acid amide to solvent containing benzyl alcohol as main component: 30/70)
(5) Solvent benzyl alcohol (purity 99% or more)

  The raw materials shown in the above (1) to (4) and the alkoxysilanes 14 and 15 in Table 1 were blended in the proportions shown in Table 3 to prepare surface impregnated materials 1 to 20. Surface impregnating materials 21 to 38 were prepared by blending the raw materials shown in the above (1) to (5) and the alkoxysilanes 14 and 15 shown in Table 1 at a ratio shown in Table 4. In addition, the compounding quantity of the higher fatty acid amide of Table 3 and Table 4 is the mass of solid content (higher fatty acid amide) remove | excluding the solvent component from the paste.

[Evaluation of surface impregnated material]
The viscosity, TI value (thixotropic coefficient) and sagging property of the surface impregnated materials 1 to 38 were evaluated. The results are shown in Tables 5 and 6. Moreover, each evaluation was performed by the method shown below.

(1) Viscosity Under the conditions of a temperature of 20 ° C., the viscosity at a rotational speed of 0.5 rpm, 20 rpm, and 100 rpm is measured using a BH type viscometer (B type viscometer BH, rotor No. 3 manufactured by Toki Sangyo Co., Ltd.). It was measured. Note that rpm represents the number of rotations per minute.

(2) TI value (RPM0.5 / RPM100)
The viscosity was obtained by dividing the viscosity at the rotation speed of 0.5 rpm by the viscosity at the rotation speed of 100 rpm.

(3) Sagging property A surface impregnated material is applied in a horizontal direction to a thickness of 225 μm using an applicator on a horizontally placed calcium silicate plate. The degree of flow in the direction was confirmed visually.
A ... No sauce B ... Sauce almost none C ... Sauce

  As shown in Table 5 and Table 6, with respect to 100 parts by mass of alkoxysilane, the content of petroleum naphtha is 20 to 120 parts by mass, the content of higher fatty acid amide is 0.2 to 10 parts by mass, and styrene-diene copolymer Surface impregnating material having a coal content of 4 to 10 parts by mass and a mass ratio of styrene-diene copolymer to the total amount of higher fatty acid amide and styrene-diene copolymer of 0.60 to 1.00 In 1-6, 10, 11, 13-15, 17, 21-38, the viscosity and TI value were good (Examples 1-1 to 1-30). Also in the surface impregnating materials 8, 9, 16, and 18 in which the mass ratio of the styrene-diene copolymer to the total amount of the higher fatty acid amide and the styrene-diene copolymer is less than 0.60, the viscosity, the TI value, and The sagging property was good (Comparative Examples 1-1, 1-2, 1-4, 1-5). Further, the surface impregnated material 12 in which the higher fatty acid amide exceeds 10 parts by mass has a high viscosity and could not be applied (Comparative Example 1-3). Moreover, in the surface impregnation materials 19 and 20 which mix | blended polymers other than a styrene-diene copolymer, the polymer was insoluble in alkoxysilane and the surface impregnation material could not be prepared (Comparative Example 1-6). 1-7).

(Example 2, Comparative Example 2, Reference Example 2)
The impregnation depth and the water permeation suppression ratio with respect to the mortar substrate were evaluated using the surface impregnated materials 1 to 6, 7 to 11, 13 to 18, 32, and 38. The results are shown in Table 7. Here, the test body was prepared by applying the surface impregnated material to the mortar substrate by coating the roller once with the application amount shown in Table 7. A method for producing a mortar substrate and a method for evaluating each specimen are as follows.

[Production of mortar substrate]
It was prepared according to “5.1.1 Preparation of Mortar Substrate” in “17. Test Method of Surface Impregnated Material (Draft)” of JSCE K-571-2010.

[Evaluation methods]
(1) Appearance Observation Test This was performed in accordance with “6.1 Appearance Observation Test” in “17.
A ... No change B ... No change C ... Partial white D ... White (2) Impregnation depth JSCE K-571-2010 "6.2. Impregnation depth test" In accordance with the above, the impregnation depth of the test specimens in each example was evaluated.
(3) Permeability suppression ratio Calculate the permeation ratio (%) of each specimen in accordance with “6.3 Permeability Test” in “17. Test Method for Surface Impregnated Material (Draft)” of JSCE K-571-2010. The value obtained by subtracting the water permeability ratio (%) from 100% was taken as the “water permeability suppression ratio” in each example.

  As shown in Table 7, in Examples 2-1 to 2-14 using the surface impregnating materials 1 to 6, 10, 11, 13 to 15, 17, 32 and 38, the appearance was not changed, and the impregnation depth was All were 2.2 mm or more, which was a good result. Moreover, the water permeation suppression ratio was 75% or more, which was a good result. On the other hand, Comparative Example 2-1 using surface impregnating materials 8, 9, 16, and 18 in which the mass ratio of styrene-diene copolymer to the total amount of higher fatty acid amide and styrene-diene copolymer is less than 0.60. In ˜2-4, a white color change was observed in the appearance observation test. In Reference Example 2-1 using the surface impregnating material 7, the impregnation depth showed the smallest value even though the application amount of alkoxysilane was the largest.

(Example 3)
The impregnation depth and the water permeation suppression ratio with respect to the mortar substrate were evaluated using the surface impregnated materials 21 to 31 and 33 to 37. The results are shown in Table 8. Here, the test body was prepared by applying the surface impregnated material to the mortar substrate by applying the roller once with the application amount shown in Table 8. A method for producing a mortar substrate and a method for evaluating each specimen are as follows.

[Production of mortar substrate]
It was prepared according to “5.1.1 Preparation of Mortar Substrate” in “17. Test Method of Surface Impregnated Material (Draft)” of JSCE K-571-2010.

[Evaluation methods]
This was carried out in accordance with “6.1 Appearance Observation Test” in “17. Test Method of Surface Impregnated Material (Draft)” of JSCE K-571-2010.
A ... No change B ... No change C ... Partial white D ... White

  As shown in Table 8, in Examples 3-1 to 3-7 using the surface impregnated materials 21 to 31 and 33 to 37, the appearances were all unchanged, and the results were good. In Examples 3-1 to 3-16, the impregnation depth and the water permeation suppression ratio were as good as those of Examples 2-1 to 2-14 described above.

  According to the present invention, even if the construction surface is a wall or a ceiling without changing the appearance of a structure such as concrete, it is possible to apply an appropriate amount in a single application operation and to make it permeable. An excellent surface impregnating material can be provided. In addition, the structure of the present invention reacts with the surface impregnating material to form a water repellent layer near the surface of the structure, thereby suppressing or preventing the penetration of moisture, salt, carbon dioxide, etc. It is possible to maintain an excellent structure and contribute to reduction of life cycle cost.

Claims (3)

Containing alkoxysilane, petroleum naphtha, higher fatty acid amide, and styrene-diene copolymer,
The alkoxysilane is represented by the following formula (1):
For 100 parts by mass of the alkoxysilane,
The petroleum naphtha content is 20 to 120 parts by mass, the higher fatty acid amide content is 0.2 to 10 parts by mass, and the styrene-diene copolymer content is 4 to 10 parts by mass,
A surface-impregnated material, wherein a mass ratio of the styrene-diene copolymer to a total amount of the higher fatty acid amide and the styrene-diene copolymer is 0.60 to 1.00.
R ¹ _n Si (OR ² ) _4-n (1)
(In the formula, R ¹ represents an alkyl group having 5 to 12 carbon atoms or a phenyl group, and n represents 1 or 2. When n is 2, R ¹ may be the same as or different from each other. R ² represents an alkyl group having 1 to 4 carbon atoms, and a plurality of R ² may be the same or different from each other.   The surface impregnated material according to claim 1, wherein a 25 mass% toluene solution of the styrene-diene copolymer has a viscosity at 25 ° C of 100 to 30000 mPa · s.   The structure obtained by apply | coating the surface impregnation material of Claim 1 or 2 to a structure surface.