JPH10330727A - Surface treating agent for porous material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a water-based surface treating agent which is effective to modify the surface of a substrate when applied to a porous material such as a nonwoven fabric, has high adhesiveness to various substrates and can retain stable performances by using a water-soluble sulfonic acid (salt) group containing a diene (co)polymer as the principal component. SOLUTION: The water-soluble sulfonic acid (salt) group containing a diene (co)polymer (base polymer) is obtained by sulfonating a diene (co)polymer essentially consisting of a diene monomer. The diene monomer is desirably 1,3-butadiene, isoprene or 1,3-pentadiene. In addition to the diene monomer, other monomers can be used. The weight-average molecular weight of the base polymer is desirably in the range of 3,000-1,000,000. This agent may contain an organic filler, an inorganic filler or the like in addition to this sulfonate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a surface treating agent for performing a surface treatment on a porous material.

[0002]

2. Description of the Related Art Conventionally, porous materials such as nonwoven fabrics have been used in building materials, electric appliances, electronic materials, optics, precision materials, automobiles,
It is widely used in communication, measurement equipment, battery materials, office equipment, medical materials, clothing materials, general household products, and the like. The surface of these porous materials is rather hydrophobic and has functions such as hydrophilicity, hygroscopicity, antistatic properties, prevention of dirt adhesion, and capture of ionic substances floating in water or air. There is a problem that it is difficult to express, and application to various fields is limited.

As a solution, for example, Japanese Patent Application Laid-Open No. Sho 64-5
No. 7568 discloses a method of sulfonating a polyolefin-based nonwoven fabric to impart hydrophilicity.
In these methods, the polyolefin resin is sulfonated with concentrated sulfuric acid or fuming sulfuric acid. However, there are practical problems such as a low reaction rate and difficult control, and a need to remove unreacted sulfonating agent. There is. In addition, Japanese Patent Application Laid-Open No. 3-82871 discloses a technique for improving hydrophilicity by treating a polyolefin-based nonwoven fabric with an aqueous alkoxylated surfactant. However, there are problems that the adhesion of the surfactant to the nonwoven fabric is insufficient, the effect may not be maintained for a long time, and the hydrophilicity of the nonwoven fabric obtained by this method is not yet sufficient.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a surface treating agent which is effective for modifying the surface of a substrate by coating a porous material such as a non-woven fabric. By coating the surface,
Excellent in hydrophilicity, hygroscopicity, humidity control, and prevention of adhesion of dirt and dust due to static electricity, etc., and also shows a weak base such as ammonia and amine, or an action of capturing ionic substances. It is an object of the present invention to provide an aqueous surface treating agent for a porous material, which has a high adhesive force and can maintain stable performance.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a porous material containing a water-soluble sulfonic acid (salt) group-containing diene (co) polymer (hereinafter also referred to as "water-soluble sulfonated product") as a main component. It is intended to provide a surface treatment agent.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The water-soluble sulfonic acid (salt) group-containing diene (co) polymer used in the present invention is, for example, a diene (co) polymer having a diene monomer as an essential component (hereinafter referred to as "base polymer"). "Also referred to as"). As the diene monomer used for the base polymer, for example, 1,3-butadiene, 1,2
-Butadiene, 1,2-pentadiene, 1,3-pentadiene, 2,3-pentadiene, isoprene, 1,2-
Hexadiene, 1,3-hexadiene, 1,4-hexadiene, 1,5-hexadiene, 2,3-hexadiene, 2,4-hexadiene, 2,3-dimethyl-1,3
-Butadiene, 2-ethyl-1,3-butadiene, 1,
2-heptadiene, 1,3-heptadiene, 1,4-heptadiene, 1,5-heptadiene, 1,6-heptadiene, 2,3-heptadiene, 2,5-heptadiene,
In addition to 3,4-heptadiene, 3,5-heptadiene, cyclopentadiene, dicyclopentadiene, ethylidene norbornene, and the like, various aliphatic or alicyclic dienes having 4 to 7 carbon atoms may be mentioned. Alternatively, two or more kinds can be used in combination. Preferably, they are 1,3-butadiene, isoprene, and 1,3-pentadiene.

In addition to these diene monomers, other monomers can be used in combination. As other monomers,
For example, aromatic monomers such as styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, m-methylstyrene, vinylnaphthalene, methyl (meth) acrylate, ethyl (meth) acrylate, and (meth) acrylic acid Alkyl (meth) acrylates such as butyl, mono- or dicarboxylic acids or anhydrides of dicarboxylic acids or dicarboxylic acids such as (meth) acrylic acid, crotonic acid, maleic acid, fumaric acid, and itaconic acid; vinyl cyanide compounds such as (meth) acrylonitrile , Vinyl chloride, vinylidene chloride, vinyl methyl ethyl ketone, vinyl acetate, (meth)
Unsaturated compounds such as acrylamide and glycidyl (meth) acrylate; These other monomers are 1
These can be used alone or in combination of two or more.
When these other monomers are used in combination, the amount of the diene monomer used is preferably 0.5% by weight or more, more preferably 1% by weight or more, and particularly preferably 5% by weight or more. If it is less than 0.5% by weight, the content of sulfonic acid (salt) group introduced into the sulfonated product obtained by sulfonation may be low, which is not preferable.

The base polymer comprises a diene monomer and, if necessary, other monomers, a radical polymerization initiator such as hydrogen peroxide, benzoyl peroxide, azobisisobutyronitrile, n-butyllithium, sodium naphthalene, metal In the presence of an anionic polymerization initiator such as sodium, using a known solvent if necessary,
Usually, -100 to 150 ° C, preferably 0 to 130 ° C
To obtain (co) polymerization.

On the other hand, a part of the remaining double bonds of the base polymer which is a precursor of the water-soluble sulfonated product can be hydrogenated. In this case, a known hydrogenation catalyst can be used, and examples thereof include a catalyst and a method described in JP-A-5-222115. After hydrogenation of the base polymer, sulfonation can be performed by the method described below, but there is no problem if the (co) polymer is sulfonated and then hydrogenated.

[0010] The base polymer used in the present invention may be any of a random type or a block type copolymer such as AB type or ABA type without any particular limitation. Preferred base polymers include, for example, isoprene homopolymer, butadiene homopolymer, isoprene-styrene random copolymer, isoprene-styrene block copolymer, styrene-isoprene-styrene ternary block copolymer, butadiene-styrene random copolymer. Polymers, butadiene-styrene block copolymers, styrene-butadiene-styrene block copolymers, and hydrogenated products of these (co) polymers, ethylene-propylene-diene terpolymers, and the like, and are preferable. An aromatic monomer-conjugated diene block copolymer, more preferably a styrene-isoprene-based block copolymer.

The polystyrene-equivalent weight average molecular weight (hereinafter also referred to as "Mw") of the base polymer containing a diene monomer as an essential component or a hydrogenated product thereof is preferably 3,
000 to 1,000,000, more preferably 5,0
00 to 500,000, particularly preferably 10,000 to
400,000. If Mw is less than 3,000, sufficient strength cannot be obtained, while 1,000,000
When it exceeds, it becomes difficult to become water-soluble after the sulfonation reaction,
Use problems arise.

The water-soluble sulfonated product of the present invention can be prepared by converting the above base polymer into a known method, for example, edited by The Chemical Society of Japan, New Experimental Lecture (Vol. 14, III, pp. 1773) or JP-A-2-227403. Obtained by sulfonation according to the method described above.

That is, the base polymer can be sulfonated at a double bond portion in the polymer using a sulfonating agent. In this sulfonation, the double bond is opened to form a single bond, or a hydrogen atom is replaced with a sulfonic acid (salt) while the double bond remains. When another monomer is used, for example, an aromatic unit may be sulfonated in addition to a diene unit portion in a double bond portion. The sulfonating agent in this case is preferably sulfuric anhydride, a complex of sulfuric anhydride and an electron donating compound, sulfuric acid, chlorosulfonic acid,
Fuming sulfuric acid, bisulfite (Na salt, K salt, Li salt, etc.)
Are used.

Here, as the electron donating compound, N,
Ethers such as N-dimethylformamide, dioxane, dibutyl ether, tetrahydrofuran, diethyl ether; pyridine, piperazine, trimethylamine,
Amines such as triethylamine and tributylamine;
Sulfides such as dimethyl sulfide and diethyl sulfide; nitrile compounds such as acetonitrile, ethyl nitrile and propyl nitrile; and the like, of which N, N-dimethylformamide and dioxane are preferable.

The amount of the sulfonating agent is usually from 0.2 to 2.0 mol, preferably from 0.3 to 1.2 mol, in terms of sulfuric anhydride, relative to 1 mol of the diene unit in the base polymer. If it is less than 0.2 mol, it is difficult to obtain a water-soluble sulfonic acid polymer, while if it exceeds 2.0 mol, the amount of unreacted sulfonating agent such as sulfuric anhydride increases, and after neutralization with alkali, Is produced, and the purity is undesirably reduced.

In the sulfonation, a solvent inert to a sulfonating agent such as sulfuric anhydride can be used. Examples of the solvent include halogenated compounds such as chloroform, dichloroethane, tetrachloroethane, tetrachloroethylene and dichloromethane. Hydrocarbons; nitromethane,
Nitro compounds such as nitrobenzene; and aliphatic hydrocarbons such as liquid sulfur dioxide, propane, butane, pentane, hexane, and cyclohexane. These solvents may be used as a mixture of two or more.

The reaction temperature for this sulfonation is usually -7
0 to + 200 ° C, preferably -30 to + 50 ° C,
If the temperature is lower than -70 ° C, the sulfonation reaction is slow, which is not economical. Thus, an intermediate (a sulfonate of the base polymer, hereinafter referred to as “intermediate”) in which a sulfonating agent such as sulfuric anhydride is bonded to the base polymer is produced.

In the water-soluble sulfonated product of the present invention, the double bond is opened to form a single bond to which a sulfonic acid (salt) is bonded by reacting the intermediate with water or a basic compound, or It is obtained by replacing a hydrogen atom with a sulfonic acid (salt) while leaving a double bond. Examples of the basic compound include alkali metal hydroxides such as sodium hydroxide, potassium hydroxide, and lithium hydroxide; sodium methoxide, sodium ethoxide, potassium methoxide, sodium tert-butoxide, and potassium methoxide.
alkali metal alkoxides such as t-butoxide; carbonates such as sodium carbonate, potassium carbonate and lithium carbonate; methyl lithium, ethyl lithium, n-butyl lithium, sec-butyl lithium, amyl lithium, propyl sodium, methyl magnesium chloride, ethyl magnesium Organometallic compounds such as bromide, propylmagnesium iodide, diethylmagnesium, diethylzinc, triethylaluminum, triisobutylaluminum; aqueous ammonia, trimethylamine,
Examples include amines such as triethylamine, tripropylamine, tributylamine, pyridine, aniline, and piperazine; and metal compounds such as sodium, lithium, potassium, calcium, and zinc. These basic compounds can be used alone or in combination of two or more. Among these basic compounds, alkali metal hydroxides and aqueous ammonia are preferable, and sodium hydroxide and lithium hydroxide are particularly preferable.

The basic compound is used in an amount of 2 mol or less, preferably 1.3 mol, per 1 mol of the sulfonating agent used.
If it is less than 2 moles, and if it exceeds 2 moles, the amount of unreacted basic compounds increases, and the purity of the product is undesirably reduced. In the reaction between the intermediate and a basic compound, the basic compound can be used in the form of an aqueous solution, or can be used by dissolving it in an organic solvent inert to the basic compound. Examples of the organic solvent include, in addition to the above various organic solvents, aromatic hydrocarbon compounds such as benzene, toluene, and xylene; methanol, ethanol, propanol,
Examples include alcohols such as isopropanol and ethylene glycol. These solvents may be used as a mixture of two or more.

When the basic compound is used as an aqueous solution or an organic solvent solution, the basic compound concentration is usually
It is about 1 to 70% by weight, preferably about 10 to 50% by weight. The reaction temperature is usually -30 to +150.
° C, preferably 0 to + 120 ° C, more preferably +5
It is carried out at 0 to + 100 ° C, and can be carried out at normal pressure, reduced pressure or increased pressure. Further, the reaction time is usually 0.1 to 24 hours, preferably 0.5 to 24 hours.
5 hours.

On the other hand, the water-soluble sulfonated product of the present invention can be prepared by, for example, using a sulfonic acid (salt) of a diene monomer or a sulfonic acid (salt) of a diene monomer and the other monomer described in JP-A-1-263103. A monomer component consisting of a combination of the above, usually in the presence of a radical polymerization initiator or an anionic polymerization initiator, -100 ℃ ~ +1
It can also be obtained by conducting (co) polymerization at 50 ° C., preferably at 0-130 ° C. Here, the sulfonic acid (salt) of the diene monomer is preferably isoprenesulfonic acid (salt). The weight average molecular weight in terms of polystyrene of the water-soluble sulfonated product thus obtained is preferably 4,000 to 2,000,000, more preferably 5,5.
000 to 1,000,000. When the weight average molecular weight is less than 4,000, sufficient strength cannot be obtained, which is not preferable. On the other hand, when the weight average molecular weight exceeds 2000, 000, it is difficult to become water-soluble, which causes a problem in use.

The sulfonic acid (salt) group content of the water-soluble sulfonic acid (salt) group-containing diene (co) polymer as described above is as follows:
It is preferably at least 2.5 mmol / g, more preferably at least 3 mmol / g. If it is less than 2.5 mmol / g, functions such as hydrophilicity and ion-capturing properties may not be sufficiently exhibited, and the polymer is hardly water-soluble, so that it cannot be coated with an aqueous solvent.

The structure of the water-soluble sulfonic acid (salt) group-containing diene (co) polymer of the present invention can be confirmed from the absorption of the sulfone group by an infrared absorption spectrum.
These composition ratios can be known by elemental analysis or the like. The structure can be confirmed by a nuclear magnetic resonance spectrum. In the case of the copolymer, the water-soluble sulfonic acid (salt) group-containing diene (co) polymer of the present invention is a porous material by introducing a component based on a monomer other than the diene monomer. In some cases, coating properties or adhesion to the coating may be improved.

As the surface treating agent for a porous material of the present invention, the above water-soluble sulfonated products can be used alone or in combination of two or more. Further, the surface treating agent for a porous material containing the water-soluble sulfonated product as a main component of the present invention can be used in combination with another water-based polymer. Other water-based polymers include, for example, water-based emulsions such as styrene-butadiene rubber emulsions, emulsions obtained from emulsion polymerization such as acrylic resin emulsions, and polyurethanes, polyesters, sulfonated diene polymers (water-insoluble), and the like. Emulsions. In addition, water-soluble compounds having a sulfonic acid group, such as a sulfonated styrene (co) polymer, a styrenesulfonic acid (salt) (co) polymer, and an acrylamide-2-methylpropanesulfonic acid (salt) (co) polymer. A polymer or a water-soluble (co) polymer containing acrylic acid (salt) and methacrylic acid (salt) can be used in combination.

The surface treating agent for a porous material of the present invention can be used by mixing and dispersing with various organic fillers or inorganic fillers other than the above-mentioned water-soluble sulfonated product. As organic or inorganic fillers, those that provide mechanical properties such as rigidity, tensile strength, impact resistance, toughness, and slidability, and that provide thermal properties such as heat resistance, thermal expansion, and heat radiation. Objects, those that impart electrical or magnetic properties such as conductivity, insulation, piezoelectricity, pyroelectricity, dielectricity, semiconductor properties, magnetism, electromagnetic wave absorption, electromagnetic wave reflection, light transmission, light shielding, light What imparts optical properties such as scattering, light absorption, photochromic properties, ultraviolet absorption, infrared absorption, light resistance, antibacterial properties,
Those that impart vibration damping properties, sound insulation properties, moisture absorption properties, gas absorption properties, oil absorption properties, radiation absorption properties, and the like can be used.

Examples of this include carbon black, Ketjen black, graphite, charcoal powder, carbon fiber, iron, silver,
Copper, lead, nickel, silicon carbide, tin oxide, iron oxide, titanium oxide, magnesium oxide, zinc oxide, cerium oxide, calcium oxide, zirconium oxide, antimony oxide, ferrite, alumina, aluminum hydroxide, magnesium hydroxide, titanic acid Potassium, barium titanate, titanic acid, lead zirconate, zinc borate, zinc carbonate,
Mica, barium sulfate, calcium carbonate, molybdenum sulfide, polytetrafluoroethylene (Teflon) powder, talc, asbestos, silica beads, glass powder, hydrotalcite, iron phthalocyanine, silica gel, zeolite, sepiolite, zonotolite, activated clay, polymer beads And the like. The method of mixing and dispersing these fillers is not particularly limited, and known methods such as a stirrer, a sand mill, a pent conditioner, and a ball mill can be used.

In coating the porous material with the surface treatment agent for a porous material containing the water-soluble sulfonated compound of the present invention as a main component, water is used. If the amount is small, an organic solvent other than water can be used in combination.

The porous material treated with the surface treating agent for a porous material of the present invention includes, for example, nonwoven fabric, woven fabric,
Fabrics such as knitted fabrics may be mentioned, and these materials may be natural fibers, artificial fibers, synthetic fibers, and mixtures thereof. Its components include ethylene, propylene,
In addition to homopolymers of olefins such as butene-1, pentene-1, hexene-1, and 4-methylpentene-1, random or block copolymers of these olefins,
Known materials such as cotton, wool, rayon, acetate, polyamide, polyester, and acrylic fiber can be used. Further, rock wool, ceramic wool, glass fiber and the like can be used.

The amount (basis weight) of the surface treatment agent of the present invention to be coated on these porous materials depends on the material of the porous material, the pore diameter, and the intended use, and cannot be unconditionally defined. Usually 0.5-30g
/ M ² , preferably 1 to 15 g / m ² . 0.5g
Is less than / m ^2, the hydrophilic performance of interest, such as ion-capturing property is hardly exhibited, while when it exceeds 30 g / m ^2,
The mechanical strength of the porous material after the treatment is undesirably reduced.

The method for applying the surface treating agent of the present invention to a porous material is not particularly limited, and brushing, spraying, a roll coater, a flow coater, a bar coater, a dipping treatment and the like can be used. The coating film thickness varies depending on the application, but is usually 0.1 to 100 as a dry film thickness.
Microns, preferably 0.1 to 50 microns. The drying conditions are not particularly limited.
It is carried out at 150C, preferably at 70-130C.

The surface treating agent of the present invention is effective in modifying the surface of a porous material. In particular, by coating on a hydrophobic surface, it becomes possible to develop or maintain hydrophilicity and hygroscopicity. In addition, it has an action of preventing adhesion of dirt and dust due to static electricity and the like, and a function of trapping weak bases or ionic substances such as ammonia and amine existing in the air or water. Furthermore, by coating the surface of the battery separator, the effect of improving the affinity with the battery electrolyte and leading to the improvement of the battery characteristics can be expected. Furthermore, the surface treating agent of the present invention has the excellent characteristics that it has high adhesion to various substrates, hardly peels off the coating film from the substrate, and can maintain stable performance for a long period of time.

The porous material coated with the surface treating agent of the present invention can be applied to various uses. For example, a cationic dyeing aid for textiles, a water-absorbent nonwoven fabric, a nonwoven fabric for wet tissue, a nonwoven fabric for sealing material, an antifouling material, an ion exchange fiber, a hydrophilizing agent for battery separators, an air cleaning filter for capturing ammonia, ionic substances, etc. , Filter applications such as water purifying filter, leukocyte removal filter, hay fever allergen removal material, water vapor permeable material, antibacterial material, deodorant fiber, deodorant paint, deodorant paper, antifogging material, anti-condensation material, etc. Examples include wet materials, antistatic materials, anticorrosion materials, oxygen absorbers, sanitary articles, and surface modification of activated carbon.

[0033]

Hereinafter, embodiments of the present invention will be described.
The present invention is not limited by these. In the examples, parts and% are by weight unless otherwise specified. Various evaluations and measurements in the examples were performed by the following methods. Total content of sulfonic acid groups A 20% aqueous solution of each water-soluble sulfonated product was prepared, and a dialysis membrane [Cellulose Dio, manufactured by Hanoi Chemicals Co., Ltd.]
lyser Tubing-VT351] to remove low-molecular substances. The sample was ion-exchanged with a cation exchange resin (Amberlite IR-118H, manufactured by Organo Co., Ltd.), and completely converted into an acid form, and the amount of sulfonic acid was determined by potentiometric titration. Weight average molecular weight (Mw ) of water-soluble sulfonated product The weight average molecular weight (Mw ) was measured by gel permeation chromatography (GPC) using Na polystyrene sulfonate as a standard sample.

Coating Method A 2% aqueous solution or aqueous dispersion containing a surface treating agent or an additive and an additive was prepared, and a 10 cm square nonwoven fabric was dipped in this solution. Then, it dried at 80 degreeC for 2 hours with the dryer, and was set as the evaluation sample. The coating amount was calculated from the weight increase before and after the coating due to the dipping treatment.

[0035] After the antistatic specimen is charged by corona discharge, by which the charged voltage is measuring the time (half-life) until attenuated to half, it was evaluated antistatic. (JIS-L-1094). A half life of 60 seconds or less was rated as ○, and a half life of more than 60 seconds was rated as x. Distilled water was poured onto the coated nonwoven fabric to evaluate the hydrophilicity, and the degree to which the distilled water soaked into the nonwoven fabric was qualitatively observed. A sample having relatively good penetration was evaluated as ○, and a product that did not readily penetrate was evaluated as ×.

The non-woven fabric coated in ammonia-saturated steam having an ammonia adsorption amount of 25 ° C. was allowed to stand overnight. After the standing, vacuum drying was performed at 50 ° C. for 5 hours in order to simply remove the attached ammonia. After drying, the nonwoven fabric was immersed in a mixture of 2 g of a 0.1 N aqueous sodium hydroxide solution and 50 cc of water, and shaken in a sealed state. By this operation, the ammonia adsorbed on the nonwoven fabric was released and dissolved in water. The aqueous phase was analyzed with a trace total nitrogen analyzer (manufactured by Mitsubishi Chemical Corporation, Model TN-05) to determine the amount of ammonia adsorbed on the nonwoven fabric.

Adhesive water-soluble sulfonate, or 10% containing this and an additive
The aqueous solution was applied on a polypropylene substrate with an applicator and dried at 80 ° C. for 2 hours. The adhesion to the polypropylene substrate was evaluated by a cross-cut adhesive tape (using cellophane tape) peel test. Of the 100 crosses,
The evaluation was based on the number of grids that did not peel.

Reference Example Preparation of Water-Soluble Sulfonated Compounds A to G A prescribed amount of dioxane (700 g) was placed in a glass reaction vessel.
, And a specified amount of sulfuric anhydride (water-soluble sulfonate A: 82.5 g, the same B: 67.1 g, the same C: 54.4)
g, D: 45.8 g, E: 88.6 g, F: 6
(7.1 g, G: 54.4 g) was added while maintaining the internal temperature at 25 ° C., and the mixture was stirred for 2 hours to obtain a sulfuric anhydride-dioxane complex. The complex obtained above was added to a dioxane solution of the base polymer (100 g) shown in Table 1 while maintaining the internal temperature at 25 ° C., and stirring was further continued for 2 hours. On the other hand, when the counter ion is Na, a prescribed amount of sodium hydroxide (water-soluble sulfonate A; 43.8 g, B: 35.2 g)
g, C: 28.6 g; D: 24.1 g)
The aqueous solution dissolved in water was added, and water was added when the counter ion was turned into a proton, and the mixture was stirred at 80 ° C. for 1 hour. After stirring, water was distilled off under reduced pressure to obtain a water-soluble sulfonated product. Table 1 shows the measurement results of the sulfonic acid group content and Mw.

Preparation of Water-Soluble Sulfonated Product J In a pressure vessel, 200 g of sodium isoprenesulfonate and 7
Then, the temperature was raised to 80 ° C. Then 30%
Add 40 g of hydrogen peroxide, raise the internal temperature to 100 ° C,
Polymerization was performed for 3 hours. After completion of the polymerization, water was removed under reduced pressure to obtain a water-soluble sulfonated product. This polymer is designated as J.

Examples 1 to 20, Comparative Examples 1 to 7 Using the water-soluble sulfonated compounds shown in Table 1, antistatic properties (Examples 1 to 7, Comparative Examples 1 to 2) and hydrophilic properties (Examples 8 to 8) 12,
Comparative Examples 3 to 4), Ammonia adsorption amount (Examples 13 to 1)
5, Comparative Examples 5 to 6) and adhesion (Examples 16 to 20, Comparative Example 7) were evaluated. The results are shown in Tables 2 to 5. In addition,
In Tables 2 to 5, AE350 used as an additive
Is an acrylic resin emulsion manufactured by Japan Synthetic Rubber Co., Ltd.

[0041]

[Table 1]

[0042]

[Table 2]

[0043]

[Table 3]

[0044]

[Table 4]

[0045]

[Table 5]

[0046]

The surface treatment agent for a porous material of the present invention is effective for modifying the surface of a porous material. In particular, by coating on a hydrophobic surface, it becomes possible to develop or maintain hydrophilicity and hygroscopicity. In addition, it has a high affinity for a weak base such as ammonia or amine present in the air or water, or an ionic substance, and exhibits a trapping action of the substance. Furthermore, the surface treating agent of the present invention has excellent characteristics that it has a high adhesion to a substrate, the coated film is hardly peeled off from the substrate, and stable performance can be maintained for a long period of time.

Continuation of the front page (72) Inventor Katsuhiro Ishikawa 2--11-24 Tsukiji, Chuo-ku, Tokyo Inside Nippon Gosei Rubber Co., Ltd.

Claims (1)

[Claims] 1. A surface treating agent for a porous material, comprising a diene (co) polymer containing a water-soluble sulfonic acid (salt) group as a main component.