JPH10237403A - Deodorant adhesive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive which can eliminate formaldehyde with ease and efficiency by incorporating a specific amount of compound having an -NHbond in the molecule thereof into a base resin of the adhesive. SOLUTION: This deodorant adhesive for formaldehyde comprises 1 to 50 pts.wt. of a compound having an -NH- bond in the molecule thereof relative to 100 pts.wt. of the resin in the adhesive and optionally an inorganic compound such as silica, a plasticizer such as glycerol, and the like. As a resin having adhesiveness, use is made of one or more resins selected from among poly(vinyl alcohol) and analogous polymers thereof which have a polymerization degree of 300 or more and a saponification degree of 85 mole % or more, and a starch and analogues thereof such as an oxydized starch. As a compound having an -NH- bond in the molecule, use is made of one or more compounds selected from among those having an amine moiety such as a hydroxyl amine, those having a urea moiety such as dimethylurea and those having an amide moiety such as formamide. For adsorbing and eliminating formaldehyde satisfactorily, an adhesive layer is required to have a thickness of 0.5 to 50μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aldehyde deodorizing adhesive containing a compound having a --NH-- bond in a molecule, and more particularly to an aldehyde deodorizing adhesive comprising polyvinyl alcohol or starch. More specifically, the present invention relates to a product processed with a formaldehyde-based resin, particularly to an aldehyde deodorizing adhesive capable of reducing formaldehyde generated from a wood processing material.

[0002]

2. Description of the Related Art Formaldehyde resins are used as preservatives for wood products or as one component of adhesives such as plywood. However, the generation of formaldehyde from wood-processed materials processed with formaldehyde-based resins has become a problem, and many methods have been proposed to reduce or suppress the generation of formaldehyde.

[0003] In the case of wood-processed materials, methods of reducing the generation of formaldehyde in the adhesive of plywood or trapping formaldehyde have been widely applied by improving formaldehyde resins and processing methods. However, the conventional method is not sufficient because the performance of the adhesive is reduced.

[0004]

To compensate for these drawbacks, formaldehyde absorbent paper impregnated with a formaldehyde absorbent is laid in furniture or the like made of woodwork, or a formalin absorbent material is placed between plywood. They are laminated or laminated with a polyvinyl chloride film or sheet on the plywood surface. However, the conventional method was inferior in convenience.

[0005]

Means for Solving the Problems As a result of investigations for solving the above problems, the present inventors have found that 1 to 50 parts by weight of a compound having an -NH- bond in a molecule is added to 100 parts by weight of a resin.
The present inventors have found that a deodorant adhesive containing parts by weight can remove formaldehyde efficiently and easily, and have completed the present invention.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The adhesive for deodorization of the present invention is useful as an adhesive in a field in which formaldehyde may be generated. By laminating it on the surface of a wood-processed material that may generate formaldehyde, it is possible to reduce the diffusion of aldehyde into the air.

[0007] A compound having an -NH- bond in a molecule used in the present invention (hereinafter sometimes abbreviated simply as a compound)
Examples thereof include compounds having an amino bond, a urea bond, an amide bond or an imide bond. Examples of the compound having an amino bond include hydroxylamine, chloramine, ammonia, methanolamine, ethanolamine, dimethylamine, diethylamine, isopropylamine, butylamine, proline, hydroxyproline,
Dicyanodiamide, ethyleneimine, ethylenediamine, propylenediamine, diethylenetriamine, 1,
2-diaminopropane, 1,3-diaminopropane, triethylenetetramine, tetraethylenepentamine, iminobispropylamine, tetramethylenediamine, guanidine carbonate, glycine, alanine, sarcosine, glutamic acid, hexamethylenediamine, melamine, morpholine, 2 -Amino-4,5-dicyanoimidazole, 3
-Azahexane-1,6-diamine, 2-acrylamido-2-methylpropanesulfonic acid, α-amino-ε-
Caprolactam, acetoguanamine, guanine, acetaldehyde ammonia, 4,7-diazadecane-1,1
0-diamine, pyrrolidine, piperidine, piperazine,
Examples include polyethyleneimine, polyallylamine, polyvinylamine, and aminobenzoate. Compounds having a urea bond include urea, thiourea, methyl urea, ethyl urea, dimethyl urea, diethyl urea, ethylene urea, guanyl urea, guanyl thiourea, azodicarbonamide,
Glycolyl urea, acetyl urea and the like. Examples of the compound having an amide bond include formamide, acetamide, benzamide, oxamide, pyrrolidone, pyrrolidone carboxylic acid, oxamic acid, succinamide, dicyandiamide, oxazolidone, and malonamide. Compounds having an imide bond include succinimide, phthalimide, maleimide, succinimide, hydantoin, barbituric acid, 1-methylol-5,5-
Examples include dimethylhydantoin and isocyanuric acid. These compounds are used alone or in combination of two or more. These compounds preferably have a molecular weight of 1000 or less, more preferably 500 or less, and most preferably 3 or less.
00 or less. Among these compounds, compounds having a urea bond or an amino bond are more preferable from the viewpoint of aldehyde absorption performance.

The resin used in the present invention is not particularly limited as long as it has an adhesive property. For example, a polyvinyl acetate (PVAc) emulsion, a (meth) acrylate (co) polymer emulsion, an ethylene- Aqueous emulsions such as vinyl acetate copolymer emulsions, polyvinyl alcohols, ureas, phenols, melamines, resorcinols, cyanoacrylates, polyesters, isocyanates, imidized isobutylene-maleic anhydride copolymers Adhesives such as coalescing, starch, casein, etc. can be used. These resins are used alone or in combination of two or more. Among these resins, polyvinyl alcohol-based polymers and starch are preferred in view of the effects of the combined use with the compound.

The polyvinyl alcohol polymer is obtained by saponifying a polyvinyl ester polymer obtained by radical polymerization of a vinyl ester monomer such as vinyl acetate. Examples of the polymerization method of the vinyl ester include a solution polymerization method, a bulk polymerization method, a suspension polymerization method, and an emulsion polymerization method.

[0010] Vinyl esters include vinyl formate, vinyl acetate, vinyl propionate, vinyl valerate, vinyl laurate, vinyl stearate, vinyl benzoate,
Examples thereof include vinyl pivalate and vinyl versatate, with vinyl acetate being particularly preferred.

Further, the copolymer may be a copolymer obtained by copolymerizing a monomer copolymerizable with the above-mentioned vinyl ester, and is used within a range not to impair the gist of the present invention. Examples of such comonomers include olefins such as ethylene, propylene, 1-butene and isobutene, acrylic acid and its salts, methyl acrylate, ethyl acrylate, n-propyl acrylate, i-propyl acrylate, and n-acrylate -Butyl, i-butyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate,
Acrylic esters such as dodecyl acrylate and octadecyl acrylate, methacrylic acid and its salts, methyl methacrylate, ethyl methacrylate, n-methacrylic acid
Propyl, i-propyl methacrylate, n-methacrylate
-Butyl, i-butyl methacrylate, t-methacrylate
Butyl, 2-ethylhexyl methacrylate, methacrylic acid esters such as dodecyl methacrylate, octadecyl methacrylate, itaconic acid and salts thereof, mono- or dialkyl esters of itaconic acid having 1 to 18 carbon atoms, maleic anhydride, maleic acid and Salts thereof, mono- or dialkyl esters of maleic acid having 1 to 18 carbon atoms, acrylamide, N-methylacrylamide, N-ethylacrylamide, N, N-dimethylacrylamide, diacetoneacrylamide, acrylamidepropanesulfonic acid and salts thereof, acrylamide Propyldimethylamine and its salts or quaternary salts, acrylamide derivatives such as N-methylolacrylamide and its derivatives, methacrylamide, N-methylmethacrylamide, N-ethylmethacrylate Riruamido, methacrylamide propanesulfonic acid and salts thereof, methacrylamide propyl dimethylamine and a salt thereof or a quaternary salt, N
Methacrylamide derivatives such as methylol methacrylamide and derivatives thereof, methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, i-propyl vinyl ether, n-butyl vinyl ether, i
-Butyl vinyl ether, t-butyl vinyl ether,
Dodecyl vinyl ether, vinyl ethers such as stearyl vinyl ether, acrylonitrile, nitriles such as methacrylonitrile, vinyl chloride, vinylidene chloride,
Examples thereof include vinyl halides such as vinyl fluoride and vinylidene fluoride, allyl compounds such as allyl acetate and allyl chloride, maleic acid and salts or esters thereof, vinyl silyl compounds such as vinyl trimethoxysilane, and isopropenyl acetate.

The degree of polymerization of the polyvinyl alcohol-based polymer is 300 or more, preferably 500 or more, and more preferably 1000 or more.
000 or less. The degree of saponification of the polyvinyl alcohol-based polymer is preferably at least 85 mol% or more, more preferably 95 mol% or more, and most preferably 98 mol% or more.

As the starch used in the present invention, in addition to raw starch, modified starch such as oxidized starch, esterified starch, etherified starch, and pregelatinized starch is used. The polyvinyl alcohol polymer and starch are used alone or in combination of two or more.

The aldehyde deodorizing adhesive of the present invention comprises the above compound in an amount of 100 parts by weight of resin (solid content).
To 50 parts by weight, preferably 5 to 50 parts by weight.
The amount is from 30 to 30 parts by weight, more preferably from 10 to 20 parts by weight. When the content of the compound is less than 1 part by weight, the effect of deodorizing the aldehyde is hardly obtained, and when it is more than 50 parts by weight, the physical properties deteriorate.

In the present invention, the method for incorporating the compound into the resin is not particularly limited, and a method of adding it all at once in an initial stage, a method of adding it to a stock solution for production, and the like are used.

When the adhesive of the present invention is used, the thickness of the adhesive layer is preferably at least 0.5 μm in order to contain a sufficient formaldehyde absorbent for absorbing and removing formaldehyde. It is. If it is too thick, it is not only economically disadvantageous, but also depending on the use, for example, in the case of using a wallpaper, a decorative board, etc., the properties such as flexibility are also impaired. . Further, the thickness is more preferably 1 to 40 μm, and most preferably 2 to 20 μm.

The adhesive for deodorizing aldehydes of the present invention may contain at least one other than the above-mentioned adhesive components without impairing the gist of the present invention. For example, aqueous emulsions, clays and silicas other than those described above may be used. Inorganic compounds such as calcium carbonate, titanium (Ti) and nickel (Ni) compounds, surfactants, plasticizers such as glycerin,
A crosslinking agent such as a boron compound is exemplified. If necessary, dyes and pigments for coloring, and stabilizers such as antioxidants and ultraviolet absorbers may be added.

In providing the adhesive layer, for example, when a wallpaper or a decorative board is laminated on a base material plywood, it may be on the base material plywood side or on the wallpaper or decorative board side or both sides thereof. The adhesive is a known solvent such as water or alcohol. Examples of the alcohol-based solvent include methanol / water, ethanol / water, n-propyl alcohol / water, isopropyl alcohol / water, and t-
There is a butyl alcohol / water system or the like, and an adhesive solution of these solvents is applied to the plywood side or wallpaper or decorative board side of the base material, and dried to form a suitable adhesive layer. As the solvent, a mixture of two or more of the above-mentioned alcohols and water can be suitably used, but water alone is particularly preferable from the viewpoint of handleability. The adhesive can be applied by means such as discharge from a casting head, roll coating, doctor knife coating, doctor roll coating, curtain flow coating, gravure coating, brushing, brushing, spraying, or the like.

[0019]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the examples. In the examples, “%” and “parts” are “% by weight” and “parts by weight” unless otherwise specified.
Represents

Example 1 An aldehyde deodorizing adhesive was prepared by adding 20 parts of ethylene urea to 500 parts of a 20% aqueous solution of polyvinyl alcohol having a polymerization degree of 1700 and a saponification degree of 99.7 mol%. The adhesive is applied to both sides of 10 2.7 mm thick 5 × 15 cm plywood (single veneer moisture content of 12% or less)
It was applied so as to have a thickness of 0 μm, and high-quality paper was bonded.
And sealed with polyethylene bag, 20 ℃, 65% R
Stored under H environment for 2 weeks. Thereafter, the plywood was taken out and the formalin concentration was measured by the JAS method. 1 plywood
Put in 0L desiccator, 3 bottoms on desiccator
A petri dish containing 00 ml of water was placed, and formaldehyde generated from the test piece was absorbed at 20 ° C. for 24 hours.
The formaldehyde concentration of the petri dish water was colorimetrically determined by the acetylacetone method and found to be 7.9 mg / l.

Example 2 Evaluation was made in the same manner as in Example 1 except that the type of the adhesive was changed to oxidized starch and ethylene urea was changed to pyrrolidone carboxylic acid. The formaldehyde concentration was 10.6 mg / l. Met.

Example 3 In Example 1, the adhesive was polyvinyl alcohol 40
Evaluation was made in the same manner as in Example 1 except that the mixture was changed to 0 parts and a mixture of 100 parts of the imidized isobutylene-maleic anhydride copolymer. The formaldehyde concentration was 7.3 mg / l.
Met.

Comparative Example 1 Evaluation was made in the same manner as in Example 1 except that the aldehyde deodorant was not used. As a result, the formaldehyde concentration was 12.8 mg / l.

[0024]

By using the aldehyde deodorizing adhesive of the present invention, fields where formaldehyde and the like are generated,
For example, it is possible to reduce aldehydes generated from wood-processed materials processed with aldehydes such as formaldehyde such as a closet and a wall plate, and to remove generated formaldehyde.

Claims (3)

[Claims] 1. A resin having 100 parts by weight,
A deodorant adhesive containing 1 to 50 parts by weight of a compound having an NH-bond. 2. The deodorant adhesive according to claim 1, wherein the -NH- bond is an amino bond, a urea bond, an amide bond or an imide bond. 3. The deodorant adhesive according to claim 1, wherein the resin is a polyvinyl alcohol-based polymer or starch.