JP6936628B2 - Aqueous binder - Google Patents

Description

The present invention relates to an aqueous binder. More specifically, the present invention relates to an aqueous binder having excellent adhesiveness of mineral fibers such as glass fiber as a material for a heat-resistant laminate and containing no formaldehyde, and a mineral fiber laminate using the same.

Conventionally, a heat-resistant mineral fiber laminate is composed of mineral fibers such as glass wool and rock wool, and is manufactured by mechanically molding the mineral fibers to which a binder is attached into a mat shape or the like, and is used for buildings and buildings. Widely used as a heat insulating material for various devices. As the binder, an aqueous binder composed of a phenol resin which is a condensate of a phenol compound and formaldehyde has been widely used, but the binder usually contains formaldehyde, and formaldehyde is released from a laminate using the binder. Due to the problem of being released into the environment, improved binders containing no formaldehyde have been proposed (see, for example, Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2007-9206 Japanese Unexamined Patent Publication No. 2005-68399

However, although the binder of Patent Document 1 is a composition containing an aqueous solution of an oligomer or co-oligomer of an ethylenically unsaturated carboxylic acid or a polyol having a number average molecular weight of 300 to 900, the adhesiveness of the binder is not sufficient. There wasn't.
Further, the binder of Patent Document 2 contains a polyacid containing at least two carboxylic acid groups, an acid anhydride group or a salt thereof, a polyol containing at least two hydroxyl groups, and an alkyl group of C5 or more. Although the binder is made of an emulsion polymer containing an ethylenically unsaturated acrylic monomer as a copolymerization unit, there is a problem that the adhesiveness of the mineral fiber laminate is not sufficient because the sprayability of the binder is inferior.
An object of the present invention is to provide an aqueous binder that solves the above problems and provides a mineral fiber laminate having excellent adhesiveness of mineral fibers such as glass fiber as a heat-resistant laminate material.

The present inventors have arrived at the present invention as a result of diligent studies to solve the above problems. That is, in the present invention, a (co) polymer (A) containing an unsaturated (poly) carboxylic acid (anhydride) (a1) as a constituent monomer, a cross-linking agent (B) containing a sugar (B0), and a cross-linking agent (B). It is an aqueous binder (X) containing water.

The aqueous binder (X) of the present invention has the following effects.
(1) Excellent adhesiveness (mechanical strength) of the mineral fiber laminate.
(2) Gives the mineral fiber laminate excellent flexibility.
(3) Excellent adhesiveness of mineral fibers, especially at intersections of mineral fibers.
(4) The mineral fiber laminate is imparted with excellent sound absorption.

<(Co) polymer (A)>
The (co) polymer (A) in the present invention contains an unsaturated (poly) carboxylic acid (anhydride) (a1) as a constituent monomer [hereinafter, may be abbreviated as a constituent unit].

(A1) is a (poly) carboxylic acid (anhydride) having one polymerizable unsaturated group and having 3 to 30 carbon atoms [sometimes abbreviated as C below]. In the present invention, the unsaturated (poly) carboxylic acid (anhydrous) means an unsaturated monocarboxylic acid, an unsaturated polycarboxylic acid and / or an unsaturated polycarboxylic acid anhydride.
Among the (a1), unsaturated monocarboxylic acids include aliphatic (C3 to 24, for example, acrylic acid, methacrylic acid, α-ethylacrylic acid, crotonic acid, isocrotonic acid) and alicyclic (C6 to 24, For example, cyclohexenecarboxylic acid); unsaturated poly (2-3 or more) carboxylic acid (anhydrous) includes unsaturated dicarboxylic acid (anhydrous) [aliphatic dicarboxylic acid (anhydrous) (C4-24, eg malein). Acids, fumaric acids, itaconic acids, citraconic acids, mesaconic acids, and their anhydrides), alicyclic-containing dicarboxylic acids (anhydrous) (C8-24, eg cyclohexendicarboxylic acids, cycloheptendicarboxylic acids, bicycloheptenedicarboxylics) Acids, methyltetrahydrophthalic acids, and anhydrides thereof), etc.] and the like can be mentioned. (A1) may be used alone or in combination of two or more.
Of the above (a1), acrylic acid, methacrylic acid, maleic acid, and maleic anhydride are preferable from the viewpoint of polymerizable and adhesiveness, and acrylic acid, methacrylic acid, and acrylic acid in combination with methacrylic acid are more preferable. Acrylic acid is particularly preferable.

The (co) polymer (A) further comprises an alkyl (alkyl carbon number 1 to 24) ester (a2) of (meth) acrylic acid in order to enhance the adhesiveness and flexibility of the mineral fiber laminate. It may be a unit.

Examples of the (a2) include [methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, decyl (meth) acrylate, and (meth) acrylic acid. Isodecyl, dodecyl (meth) acrylate, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, hexadecyl (meth) acrylate, octadecyl (meth) acrylate, eicocil (meth) acrylate, 2 acrylate (meth) acrylate -Decil tetradecyl and tetracosyl (meth) acrylate] and the like.
Of the above (a2), from the viewpoint of polymerizable property with (a1) and adhesiveness, the alkyl is preferably C2-18, and more preferably the alkyl is a linear or branched alkyl of C3-12. Esters, particularly preferred are linear or branched alkyl esters whose alkyl is C4-10.

The weight ratio [(a1) / (a2)] of the monomers constituting (A) is preferably 40/60 to 99.9 / 0.1, more preferably 40/60 to 99.9 / 0.1, from the viewpoint of adhesiveness, adhesiveness, and flexibility. Is 60/40 to 99.5 / 0.5, particularly preferably 80/20 to 99/1.

Further, (A) may be a copolymer having an unsaturated monomer (x) other than the monomers (a1) and (a2) as a constituent unit, as long as the effect of the present invention is not impaired.
Examples of the unsaturated monomer (x) include hydroxyalkyl (C1-5) (meth) acrylate, (meth) acrylamide, styrene, allylamine, and (meth) acrylonitrile.
The above (x) is preferably 20% by weight or less, more preferably 5% by weight or less, and particularly preferably 1% by weight or less, based on the total weight of (a1) and (a2).

Weight average molecular weight of (A) [hereinafter abbreviated as Mw. The measurement is performed by gel permeation chromatography (GPC) described later. ] Is preferably 2,000 to 100,000, more preferably 4,000 to 70,000, and particularly preferably 6,000 to 40,000 from the viewpoint of the balance of adhesiveness.

The GPC measurement conditions for Mw and number average molecular weight (Mn) in the present invention are as follows.
<GPC measurement conditions>
[1] Equipment: Gel permeation chromatography
[Model number "HLC-8120GPC", manufactured by Tosoh Corporation]
[2] Column: "TSKgelG6000PWxl", "TSKgel"
"G3000PWxl" [both manufactured by Tosoh Corporation] are connected in series.
[3] Eluent: Methanol / water = 30/70 (volume ratio)
Dissolved 0.5% by weight sodium acetate.
[4] Reference substance: Polyethylene glycol (hereinafter abbreviated as PEG)
[5] Injection conditions: sample concentration 0.25% by weight, column temperature 40 ° C.

The copolymer (A) can be produced by a known solution polymerization method, and a solution polymerization method containing water is preferable from the viewpoint of productivity. As for the content of water, it is preferable to use 40% by mass or more of water with respect to the total amount of the solvent used, and it is preferable that the total amount of the solvent used is water.
When an organic solvent is used, it may be desolvated after polymerization and dissolved in water, or it may be used as it is without desolving. Organic solvents that can be used alone or with water include aqueous solvents (soluble in water at 25 ° C. of 10 g or more / 100 g of water), such as ketones (acetone, methyl ethyl ketone (hereinafter abbreviated as MEK), diethyl ketone, etc.). Examples thereof include alcohols (methanol, ethanol, isopropanol, etc.), and acetone, MEK, isopropanol, etc. are preferable from the viewpoint of productivity. The organic solvent can be used alone or in combination of two or more.
The (A) is usually obtained as a solution (preferably an aqueous solution from an industrial point of view), and the content (% by weight) of the (A) in the solution is the productivity and handling during the production of the aqueous binder in the subsequent step. From the viewpoint of sex, it is preferably 5 to 80%, more preferably 10 to 70%, and particularly preferably 20 to 60%.

The polymerization temperature during production of (A) is preferably 0 to 200 ° C., more preferably 40 to 150 ° C. from the viewpoint of productivity and molecular weight control of (A).
The polymerization time is preferably 1 to 10 hours, more preferably 2 to 8 hours from the viewpoint of reducing the residual monomer content in the product and productivity.
The end point of the polymerization reaction can be confirmed by the amount of residual monomer. From the viewpoint of adhesiveness, the amount of residual monomer is preferably 5% or less, more preferably 3% or less, based on the weight of (A). The amount of residual monomer can be measured by gas chromatography.

<Crosslinking agent (B)>
The cross-linking agent (B) in the present invention contains a sugar (B0). Examples of the sugar (B0) include at least one selected from the group consisting of monosaccharide (B01), disaccharide (B02) and polysaccharide (B03).

Examples of the monosaccharide (B01) include pentasaccharides (ribose, deoxyribose, etc.) and hexamonosaccharides (glucose, fructose, galactose, etc.).
Examples of the disaccharide (B02) include lactose and sucrose.
Examples of the polysaccharide (B03) include raffinose, acarbose, pectin and the like.
Of the above (B0), monosaccharides (B01) are preferable, hexasaccharides are more preferable, and glucose is particularly preferable, from the viewpoint of adhesiveness, flexibility, and sound absorption.

In addition to the above (B0), the cross-linking agent (B) may further contain (B1) to (B3) described later.
Based on the weight of the cross-linking agent (B), the weight of (B0) is preferably 30 to 90% by weight, more preferably 45 to 85% by weight, and particularly preferably 60 to 80% from the viewpoint of the balance between adhesiveness and flexibility. By weight%.

Other than the above (B0), it is selected from the group consisting of an amine compound (B1) having no hydroxyl group, an amine compound (B2) having one hydroxyl group, and a compound (B3) having two or three or more hydroxyl groups. It is preferable to contain at least one kind from the viewpoint of adhesiveness and the shape of the cured product described later.

The amine compound (B1) having no hydroxyl group is a poly (2 to 6-valent or higher) amine having C2 or more and Mn 2,000 or less, and is an aliphatic polyamine (B11), an alicyclic polyamine (B12), or a heterocyclic ring. Formulas include polyamines (B13), aromatic polyamines (B14) and polyamide polyamines (B15).

Examples of the aliphatic polyamine (B11) include aliphatic polyamines [C2 to 6 alkylenediamines (C2 to 10, for example, ethylenediamine, propylenediamine, hexamethylenediamine (1,6-hexanediamine)), and polyalkylenes (C2 to 6). ) Polyamines [C4-10, for example, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, iminobispropylamine, bis (hexamethylene) triamine]] and their alkyl (C1-4) substitutions [ For example, dialkyl (C1 to 3) aminopropylamine, trimethylhexamethylenediamine, methylimethylenediamine] and other alicyclic or heterocyclic-containing aliphatic polyamines [C5 to 20, for example, 3,9-bis (3-amino). Arocyclic ring-containing aliphatic amines such as propyl) -2,4,8,10-tetraoxaspiro [5,5] undecane] [C6-14, for example, xylylenediamine, tetrachloro-p-xylylenediamine] and the like. Can be mentioned.

Examples of the alicyclic polyamine (B12) include C6 to 20, for example, 1,3-diaminocyclohexane, isophoronediamine, mensendiamine, and 4,4'-methylenedicyclohexanediamine (hydrohydrated methylenedianiline).

Examples of the heterocyclic polyamine (B13) include C4 to 20, for example, piperazine, N-aminoethylpiperazine, 1,4-diaminoethylpiperazine, and 1,4-bis (2-amino-2-methylpropyl) piperazine. ..

Aromatic polyamines (B14) include unsubstituted aromatic polyamines [C6-30, such as 1,2-, 1,3- and 1,4-phenylenediamines, 2,4'-and / or 4,4'. -Diphenylmethanediamine, crude diphenylmethanediamine (polyphenylpolymethylenepolyamine)], aromatic polyamines with nuclear-substituted alkyl groups [alkyl groups of C1-C4 such as methyl, ethyl, n- and i-propyl, butyl] [C7- 30, for example 2,4- and 2,6-tolylene diamine, crude tolylene diamine, diethyl tolylene diamine, 4,4'-diamino-3,3'-dimethyldiphenylmethane, 4,4'-bis (o) -Truidine), dianisidin], aromatic polyamines having an imino group [C7-30, for example, 4,4'-di (methylamino) diphenylmethane, 1-methyl-2-methylamino-4-aminobenzene] and the like. Be done.

The polyamide polyamine (B15) has a low molecular weight obtained by condensing a dicarboxylic acid (dimeric acid, etc.) with an excess (amino group / carboxyl group equivalent ratio of 2 or more) polyamine (the above-mentioned alkylenediamine, polyalkylene polyamine, etc.). (Mn100-1,000) Polyamide polyamines can be mentioned.

Examples of the amine compound (B2) having one hydroxyl group include those having C2 or more and Mn 1,000 or less, the following (B21) to (B23), and the like.

(B21) Monoalkanolamines C2-15, for example, ethanolamine, n-propanolamine, i-propanolamine, 6-amino-1-hexanol and the like can be mentioned.

(B22) The alkylene oxide of (B1) (hereinafter abbreviated as AO) (C2-4) 1 mol adduct C4 or more and Mn 1,000 or less, for example, 1 mol adduct of ethylenediamine propylene oxide, 1,4-phenylenediamine. Examples thereof include 1 mol adduct of ethylene oxide and 2- (2-aminoethylamino) ethanol.
(B23) Other than the above (B21) and (B22) C3 to 20, for example, N-methylethanolamine, N-ethylethanolamine, N-pentylhexanolamine can be mentioned.

Examples of the compound (B3) having two or three or more hydroxyl groups include those having C4 or more and Mn 1,000 or less, the following (B31) to (B34), and the like.

(B31) Dialkanolamines C4-10, for example, diethanolamine, diisopropanolamine and the like can be mentioned.

(B32) Trialkanolamines C6 to 15, for example, triethanolamine, triisopropanolamine and the like can be mentioned.

(B33) The AO adduct of the above (B2) (the number of moles added is 2 to 20 moles).
Examples thereof include C6 or more and Mn 1,000 or less, for example, 2 to 20 mol AO adduct of diethylenetriamine, 2 to 20 mol AO adduct of tetramethylenepentamine, and the like.

(B34) Poly (divalent to trivalent or higher) all having C2 or more and Mn 1,000 or less For example, aliphatic polyols [C2-12, for example, ethylene glycol, propylene glycol, 1,3-propanediol, 2, 2-Methyl-1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 2-methyl-2,4-butanediol, 1,5-pentanediol, 3-methyl-1,5 -Pentanediol, 1,6-hexanediol, 1,4-cyclohexanediol, 2-hydroxymethyl-2-methyl-1,3-propanediol, 2-ethyl-2-hydroxymethyl-2-methyl-1,3 -Propylenediol, 1,2,6-hexanetriol]; alicyclic polyols [of C5-12, such as 1,3-cyclopentanediol, 1,4-cyclohexanediol]; and AO (C2) of these polyols. -4) Additives and the like can be mentioned.

Of these (B1) to (B3), (B2) and (B3) are preferable, and (B21), (B31) and (B32) are particularly preferable from the viewpoint of adhesiveness and flexibility. Is (B21), (B31), most preferably isopropanolamine, diethanolamine, or a combination thereof.

<Aqueous binder (X)>
The aqueous binder (X) of the present invention is an aqueous binder containing the (co) polymer (A), a cross-linking agent (B), and water. This water-based binder (X) is particularly suitable as a water-based binder for mineral fibers.
Further, if necessary, it may contain a hydrophilic solvent such as methanol and isopropanol. In that case, the amount of the hydrophilic solvent is preferably 5% by weight or less, more preferably 1% by weight or less, based on the weight of (X).

The molar ratio of the total (β) of the primary amino group, the secondary amino group and the hydroxyl group in (B) to the carboxyl group (α) in (A) [(β) / (α)] (hereinafter, equivalent ratio). From the viewpoint of adhesiveness and flexibility of the laminate, it is preferably 0.2 to 1.5, more preferably 0.4 to 1.2, and particularly preferably 0.6 to 1.0. Is.

As for the corresponding amount ratio, the 1st and 2nd secondary amine values of (B) are measured by the measurement method described later, and the hydroxyl value of (B) and the acid value of (A) are determined by JIS K-0070 "Acid value of chemical products, acid value of hydroxyl value". It can be obtained from the results of measurement in accordance with the "test method" using the following formula.
In the following, the units of each amine value, hydroxyl value and acid value are expressed in mgKOH / g.
When (A) uses a dicarboxylic acid anhydride as a constituent unit, the acid value derived from the acid anhydride group is measured as two carboxyl groups.

Equivalent ratio = [hydroxyl value of (B) + 1, secondary amine value of (B)]
× [Weight of (B)] / [[Acid value of (A)] × [Weight of (A)]]

<Method for measuring primary and secondary amine values in (B)>
The [1] total amine value (total A) and [2] tertiary amine value (3A) of (B) are measured by the method described below, and the primary and secondary amine values (12A) are obtained from the following formula. ..

(12A) = (all A)-(3A)

However, (12A): represents a secondary amine value.
(All A): Represents the total amine value.
(3A): Represents a tertiary amine value.

[1] Total amine value (total A) measurement method The total amine value is mg of potassium hydroxide equivalent to hydrochloric acid required to neutralize the primary, secondary and tertiary amines contained in 1 g of the sample. Say a number. It is measured by the following method according to ASTMD2074.
(1) Weigh the sample precisely. (Sample amount: S ₁ g)
(2) Add 30 mL of neutral ethanol [Bromcresol Green (BCG) Neutral] and dissolve.
(3) Titrate with a 0.2 mol / L ethanolic hydrochloric acid solution (titer: f ₁ ), and the point at which the color changes from green to yellow is defined as the end point. (Titration: A ₁ mL)
(4) The total amine value (total A) is calculated from the following formula.

Total amine value (total A) = A ₁ x f ₁ x 0.2 x 56.108 / S ₁

[2] Method for measuring tertiary amine value (3A) The tertiary amine value (3A) is mg of potassium hydroxide equivalent to perchloric acid required to neutralize the tertiary amine contained in 1 g of the sample. Say a number. It is measured by the following method according to ASTMD2073.
(1) Weigh the sample precisely. (Sample amount: S ₃ g)
(2) Add 20 mL of acetic anhydride / acetic acid mixed solution (9/1) to dissolve, and allow to stand at room temperature for 3 hours.
(3) Add 30 mL of acetic acid and titrate with a 0.1 mol / L perchloric acid / acetic acid solution (titer: f ₃ ) using a potentiometric titrator. (Titration: A ₃ mL)
(4) Perform a blank test in the same manner as above. (Titration: B ₁ mL)
(5) The tertiary amine value (3A) is calculated from the following formula.

Tertiary amine value (3A) = (A _3- B ₁ ) × f ₃ × 0.1 × 56.108 / S ₃

Based on the weight of the aqueous binder (X) of the present invention, the total content of (A) and (B) is preferable from the viewpoint of the productivity of the mineral fiber laminate described later and the uniform dispersability of the aqueous binder (X). Is 2 to 80% by weight, more preferably 4 to 70% by weight, and particularly preferably 6 to 50% by weight.

In addition to the above (A), (B) and water, the aqueous binder (X) of the present invention further includes a curing accelerator (C1), a water repellent (C2), a silane coupling agent (C3) and, if necessary. It may contain at least one additive (C) selected from the group consisting of the neutralizing agent (C4).

The curing accelerator (C1) includes a protonic acid [phosphate compound (phosphate, phosphite, hypophosphite, polyphosphate, alkylphosphinic acid, etc.), carboxylic acid, carbonic acid, etc.], and a salt thereof [metal (metal (C1)). Alkali metals, alkaline earth metals, transition metals, groups 2B, 4A, 4B, 5B, etc.) Salts, etc.], metals (above), oxides, chlorides, hydroxides and alkoxides, titanium lactates , Water-soluble organic metal compounds such as zirconyl acetate, and the like, and these may be used alone or in combination of two or more.
Of these, phosphoric acid compounds and salts thereof, titanium lactate, zirconyl asate, and more preferably phosphoric acid, phosphite, hypophosphorous acid, polyphosphoric acid, alkylphosphinic acid, and the like are preferable from the viewpoint of curing rate. And titanium lactate, zirconyl asate, particularly preferred is a salt of hypophosphorous acid.
The content of (C1) is preferably 0.1 to 20%, more preferably 0.3 to 15%, particularly preferably 0.3 to 15%, based on the total weight of (A) and (B) from the viewpoint of curability and adhesiveness. It is preferably 0.5 to 10%.

Examples of the water repellent (C2) include waxes, heavy oils and silicone oils. As waxes, animal-derived wax [honey wax, lanolin wax, cellac wax, etc.], plant-derived wax [carnauba wax, wood wax, rice wax, candelilla wax, etc.], mineral-derived wax [montan wax, ozokelite, etc.], petroleum Derived wax [paraffin wax, microcrystallin wax, etc.], synthetic wax [Fishertrophe wax, polyethylene wax, polypropylene wax, polycarbonate wax, coconut oil fatty acid ester, beef fat fatty acid ester, stearic acid amide, diheptadecylketone, hardened castor oil, etc. ], And these may be used alone or in combination of two or more.
Examples of the heavy oil include those composed of C15 to 120 paraffin or naphthenic acid.
Silicone oils include reactive or non-reactive silicone oils.

Of these, paraffin wax, polyethylene wax, polypropylene wax, and reactive silicone oil are preferable from the viewpoint of water repellency, and paraffin wax is particularly preferable.

Examples of the silane coupling agent (C3) include aminosilane coupling agents [γ-aminopropyltriethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane. Etc.], epoxysilane coupling agents [γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, etc.], which may be used alone or in combination of two or more.
The content of (C3) is preferably 0.1 to 2%, more preferably 0.2 to 2%, based on the total weight of (A) and (B) from the viewpoint of adhesiveness.

The neutralizer (C4) is preferably used to neutralize the alkaline component eluted from the mineral fibers. Examples of (C4) include ammonium salts of inorganic acids [ammonium sulfate, ammonium nitrate, ammonium sulfite, ammonium phosphate, ammonium phosphite, ammonium hypophosphite, ammonium polyphosphate, ammonium chloride, diammonium hydrogen phosphate, diammonium phosphate. Ammonium hydrogen hydrogen, ammonium hydrogen carbonate, ammonium thiosulfate, ammonium hyposulfate, ammonium chlorate, diammonium peroxodisulfate, ammonium aluminum sulfate, etc.] can be mentioned, and these may be used alone or in combination of two or more.
The content of (C4) is preferably 0.1 to 5%, more preferably 0.1 to 5%, based on the total weight of (A) and (B) from the viewpoint of hydrolysis resistance of the mineral fiber laminate and adhesiveness of the mineral fibers. It is preferably 1 to 3%.

The method for producing the aqueous binder (X) of the present invention is any method that can mix and disperse the (co) polymer (A), the cross-linking agent (B), water, and the additive (C) to be added if necessary. , There is no particular limitation. The mixing time is usually 30 minutes to 3 hours, and the uniform mixing of the aqueous binder (X) can be visually confirmed.

The aqueous binder (X) of the present invention does not contain formaldehyde because it is not composed of a conventional phenol resin which is a condensate of a phenol compound and formaldehyde. Further, the aqueous binder (X) is extremely excellent in the adhesiveness of the mineral fiber laminate and the flexibility of the mineral fiber laminate evaluated by the method described later.

The aqueous binder (X) of the present invention is suitably used as a binder for mineral fibers, which is a heat-resistant laminate material.
Examples of mineral fibers include glass fibers, slag fibers, rock wool, asbestos, and metal fibers.

<Mineral fiber laminate>
The mineral fiber laminate of the present invention is a mineral fiber laminate to which a cured product of the aqueous binder (X) is attached.
For example, the aqueous binder (X) is attached to a mineral fiber and laminated to form a laminate, which is then heated and / or molded, or the mineral fiber or its strand (fiber bundle) is laminated. It is obtained by spraying and adhering the aqueous binder (X) to the laminate, and heating and / or molding the mixture.
Examples of the method for adhering the aqueous binder (X) to the mineral fiber or its laminate include an air spray method or an airless spray method, a padding method, an impregnation method, a roll coating method, a curtain coating method, a beater deposition method, and a solidification method. Known methods such as law can be mentioned.

The amount of the cured product of the aqueous binder (X) based on the weight of the mineral fibers (mineral fiber laminate) constituting the mineral fiber laminate is determined by the adhesiveness of the mineral fibers, the smoothness of the surface of the laminate, and the flexibility of the laminate. From the viewpoint of water resistance, it is preferably 0.5 to 30% by weight, more preferably 1 to 20% by weight, and particularly preferably 2 to 15% by weight.

In the production of the mineral fiber laminate of the present invention, the aqueous binder (X) is usually attached to the mineral fibers in an appropriate amount, and then heated, dried and cured.
The heating temperature is preferably 100 to 400 ° C., more preferably 200 to 350 ° C. from the viewpoints of adhesiveness, water resistance of the laminate, color suppression of the laminate, and industry.
The heating time is preferably 2 to 90 minutes, more preferably 5 to 40 minutes from the viewpoint of the reaction rate and the suppression of coloring of the laminate.

The water-based binder (X) of the present invention has excellent adhesiveness to the mineral fiber laminate, and can impart excellent flexibility to the mineral fiber laminate. This is a hypothesis, but due to the structure of the aqueous binder as described above, the binder melt efficiently cures at the intersection of the mineral fibers during curing, and the shape of the cured product (shape coefficient SF1) becomes It is presumed that this is due to the excellent adhesiveness of the mineral fibers because it is appropriate and has excellent resin physical properties.
Examples of the use of the water-based binder (X) include various known uses, and the water-based binder (X) can be suitably used for heat insulating materials, heat insulating materials, and sound absorbing materials. In particular, it is suitable for automobile sound absorbing materials.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto. In the following, parts and% indicate parts by weight and% by weight, respectively. In the following, Examples 6, 8 and 9 are referred to as References 1 to 3, respectively.

[Production of (co) polymer (A)]
<Manufacturing example 1>
300 parts of water and 43.3 parts of sodium hypophosphite were charged into the autoclave as a solvent, and nitrogen was aerated under stirring to replace nitrogen in the autoclave (gas phase oxygen concentration of 500 ppm or less). After raising the temperature to 100 ° C. while blowing nitrogen, an aqueous solution in which 11.3 parts of hydrogen peroxide solution (30 wt% aqueous solution) was dissolved in 52 parts of water and 270 parts of acrylic acid (a1-1) were separately and simultaneously prepared. The mixture was added dropwise over 3.5 hours, further stirred at 100 ° C. for 1.5 hours to polymerize, and water was added so that the non-volatile component became 40% to obtain an aqueous solution of the (co) polymer (A-1). rice field. (A-1) had Mw 8,500 and an acid value of 805.

<Manufacturing example 2>
300 parts of isopropanol was charged into the autoclave as a solvent, and nitrogen was aerated under stirring to replace the nitrogen in the autoclave (gas phase oxygen concentration 400 ppm or less). After raising the temperature to 82 ° C while blowing nitrogen, a solution in which 1.2 parts of 2,2'-azobis (2-methylbutyronitrile) was dissolved in 50 parts of isopropanol and 160 parts of acrylic acid (a1-1). And 45 parts of 2-ethylhexyl acrylate (a2-2) were simultaneously added dropwise over 3 hours, and the mixture was further stirred at 82 ° C. for 2 hours to carry out a polymerization reaction. Then, the solvent was removed at 100 ° C. for 2 hours under reduced pressure, and then water was added so that the non-volatile content became 40% to obtain an aqueous solution of the (co) polymer (A-2). (A-2) had Mw 13,000 and an acid value of 610.

<Manufacturing example 3>
300 parts of isopropanol was charged into the autoclave as a solvent, and nitrogen was aerated under stirring to replace the nitrogen in the autoclave (gas phase oxygen concentration 400 ppm or less). After raising the temperature to 82 ° C while blowing nitrogen, a solution in which 4.5 parts of 3-mercaptopropionic acid and 1.8 parts of 2,2'-azobis (2,4-dimethylvaleronitrile) were dissolved in 50 parts of isopropanol. , 165 parts of acrylic acid (a1-1) and 35 parts of lauryl methacrylate (a2-3) were simultaneously added dropwise over 3 hours, and further stirred at 82 ° C. for 2 hours to carry out a polymerization reaction. Then, the solvent was removed at 100 ° C. for 2 hours under reduced pressure, and then water was added so that the non-volatile content became 40% to obtain an aqueous solution of the (co) polymer (A-3). (A-3) had Mw 10,000 and an acid value of 650.

<Manufacturing example 4>
200 parts of water and 200 parts of isopropanol were charged into the autoclave as solvents, and nitrogen was aerated under stirring to replace nitrogen in the autoclave (gas phase oxygen concentration 400 ppm or less). After raising the temperature to 82 ° C while blowing nitrogen, 2.8 parts of 3-mercaptopropionic acid, 6.3 parts of sodium persulfate, and 0.93 parts of 2,2'-azobis (2-methylbutyronitrile) are added to isopropanol. The solution dissolved in 50 parts, 180 parts of methacrylic acid (a1-2) and 100 parts of butyl acrylate (a2-1) were simultaneously added dropwise over 3 hours, and further stirred at 82 ° C. for 2 hours to carry out the polymerization reaction. went. Then, the solvent was removed at 100 ° C. for 2 hours under reduced pressure, and then water was added so that the non-volatile content became 40% to obtain an aqueous solution of the (co) polymer (A-4). (A-4) had Mw 18,000 and an acid value of 415.

The results of Production Examples 1 to 4 are shown in Table 1.

<Examples 1 to 9, Comparative Example 1>
Each aqueous binder was prepared according to the compounding composition (part) shown in Table 2. Using the binder, a test piece of a mineral fiber laminate and a glass fiber test piece were prepared in the following manner, and each was evaluated by the method described later. The results are shown in Table 2.

<Creation of mineral fiber laminate>
Vertical x horizontal x depth 40 cm x 40 cm x 1.5 cm flat plate metal obtained by releasing a glass fiber laminate having a vertical x horizontal x thickness of 40 cm x 40 cm x 1.5 cm and a density of 0.035 g / cm ³ Placed in the mold. Next, an aqueous binder having an amount of adhered solid content equivalent to 13% based on the weight of the laminate was uniformly sprayed onto the laminate using an air spray. Then, heat treatment (drying, curing) was carried out for 25 minutes in a circulation dryer at 210 ° C. to obtain a laminate (S-1) having ^{a thickness of about 1 cm and a density of 0.040 g / cm 3.} In the same manner, a total of 5 laminated bodies (S-1) were prepared.

(1) Adhesion of Mineral Fiber Laminates Five test pieces having a length × width × thickness of 10 cm × 3 cm × 1.5 cm were cut out from each laminate (S-1). These were measured using an autograph [model number "AGS-500D", manufactured by Shimadzu Corporation] in accordance with "7.4 Tensile strength" of JIS R3420 "Glass fiber general test method", and the tensile strength was measured. Adhesion was evaluated based on the following criteria based on the average value of 5 test pieces.
<Evaluation criteria>
☆: 500N / m ² or more ◎: less than 450N / m ² more than ^{500N / m 2 ○: 400N /} m 2 more than 450N / m less than ² △: 300N / m ² more than 400N / m ² less than ×: 300N / m less than ²

(2) Flexibility of Mineral Fiber Laminates Five test pieces having a length × width × thickness of 10 cm × 3 cm × 1.5 cm were cut out from each laminate (S-1). The thickness of the test piece was measured using a caliper in units of 0.1 mm (L0).
A stainless steel plate (length and width are the same as the test pieces) was placed on these test pieces, ^{a load of 1.5 g / cm 2} was applied, and the thickness of the test pieces after 15 seconds was measured (L1). ).
Next, the stainless steel plate was removed, and the thickness of the test piece was measured 60 seconds after the removal (L2).
The degree of flexibility (%) was calculated by the following formula (1), the degree of maintenance (%) was calculated by the formula (2), and the average value of five test pieces was evaluated for flexibility according to the following criteria.

Flexibility (%) = [(L0)-(L1)] x 100 / (L0) (1)

Degree of maintenance (%) = 100-[(L0)-(L2)] x 100 / (L0) (2)

<Evaluation criteria>
☆: Flexibility 30% or more and maintenance 95% or more ◎: Flexibility 25% or more and maintenance 95% or more ○: Flexibility 20% or more and less than 25% and maintenance 95% or more Δ: Flexibility 15 % Or more and less than 20% and maintenance degree 95% or more ×: Flexibility degree less than 15% or maintenance degree less than 95%

(3) Shape coefficient SF1 of cured product
Two glass fibers (length 3 cm, diameter 100 μm) were joined at right angles at the midpoint of the fibers, and four ends of the glass fibers were fixed. 0.2 g of an aqueous binder was attached to the intersection where the glass fibers were orthogonal to each other using a microsyringe. After allowing to stand for 15 seconds, the glass fiber was heated at 200 ° C. for 60 minutes.
For the cured product at the intersection of glass fibers, the shape coefficient SF1 was determined from above. A total of 10 times was performed for each aqueous binder, and the average value of the shape coefficient SF1 was calculated.
The shape coefficient SF1 indicates the roundness of the shape of the particles, and the square of the longest diameter of the figure formed by projecting the cured product onto a two-dimensional plane represented by the following formula (1) is the figure area AREA. It is a value divided by and multiplied by 100π / 4. When the value of SF1 is 100, the shape of the cured product is a true sphere, and the larger the value of SF1, the more amorphous the cured product becomes.

SF1 = {(longest diameter) ² / (AREA)} × (100π / 4) (1)

The shape coefficient SF1 of the cured product was evaluated based on the following criteria for the average value of SF1 described above.
<Evaluation criteria>
☆: Shape coefficient SF1 is less than 115 ◎: Shape coefficient SF1 is 115 or more and less than 125 ○: Shape coefficient SF1 is 125 or more and less than 135 Δ: Shape coefficient SF1 is 135 or more and less than 145 ×: Shape coefficient SF1 is 145 or more

(4) Sound Absorption of Mineral Fiber Laminates A test piece having a diameter of 3 cm and a thickness of 1.5 cm was cut out from each of the laminates (S-1) obtained in (1) above. According to JIS A1405-2, the sound absorption coefficient in the high frequency range (2000 Hz) was measured using an acoustic tube. The sound absorption coefficient was evaluated according to the following evaluation criteria.
<Evaluation criteria>
☆: Sound absorption rate is 0.8 or more ◎: Sound absorption rate is 0.75 or more and less than 0.80 ○: Sound absorption rate is 0.70 or more and less than 0.75 Δ: Sound absorption rate is 0.65 or more and 0.70 Less than ×: Sound absorption coefficient is less than 0.65

From the results in Tables 1 and 2, it can be seen that the aqueous binder of the present invention is superior in adhesiveness to the mineral fiber laminate, and further excellent in flexibility and sound absorption, as compared with the comparative ones. In addition, it has excellent adhesiveness at the intersection of mineral fibers.

The water-based binder (X) of the present invention is particularly suitable for adhering mineral fibers (glass fibers, etc.) which are heat-resistant laminate materials, and mineral fiber laminates using the water-based binder can be used in buildings and various types. It is extremely useful because it can be applied to a wide range of fields as a heat insulating material, a heat insulating material, a sound absorbing material, and the like of an apparatus.

Claims (11)

It contains a (co) polymer (A) containing an unsaturated (poly) carboxylic acid (anhydrous) (a1) as a constituent monomer, a cross-linking agent (B) containing a sugar (B0), and water. , The (B0) is a monosaccharide (B01) which is a pentasaccharide or a hexasaccharide, and the (B) is an amine compound (B2) having one hydroxyl group in addition to the (B0). An aqueous binder containing at least one selected from the group consisting of a compound (B3) having two or three or more hydroxyl groups and having a weight of (B0) of 45 to 85% by weight based on the weight of the above (B). (X). The molar ratio [(β) / (α)] of the total (β) of the primary amino group, the secondary amino group, and the hydroxyl group in (B) to the carboxyl group (α) in (A) is 0. The aqueous binder according to claim 1, which is 2 to 1.5. The aqueous binder according to claim 1 or 2 , wherein (a1) is at least one selected from the group consisting of (meth) acrylic acid and maleic anhydride (anhydride). Claims 1 to 1, wherein the (A) is a copolymer (A) containing (a1) and an alkyl (alkyl carbon number 1 to 24) ester (a2) of (meth) acrylic acid as a constituent monomer . 3. The aqueous binder according to any one of 3. The aqueous binder according to claim 4, wherein the weight ratio [(a1) / (a2)] of (a1) and (a2) is 40/60 to 99.9 / 0.1. The aqueous binder according to any one of claims 1 to 5 , wherein the total content of (A) and (B) is 2 to 80% by weight based on the weight of the aqueous binder. The aqueous solution according to any one of claims 1 to 6, further comprising at least one additive (C) selected from the group consisting of a curing accelerator, a water repellent, a silane coupling agent, and a neutralizing agent. binder. A mineral fiber laminate to which a cured product of the aqueous binder (X) according to any one of claims 1 to 7 is attached. The laminate according to claim 8 , wherein the adhered amount of the cured product of the aqueous binder is 0.5 to 30% by weight based on the weight of the mineral fiber laminate. The laminate according to claim 8 or 9, which is used for a heat insulating material, a heat insulating material, or a sound absorbing material. A method for producing a mineral fiber laminate, which heats and / or molds the mineral fiber laminate to which the aqueous binder (X) according to any one of claims 1 to 7 is attached.