JP2002194321A - Adhesive composition for lignocellulosic hot-pressed article and method for producing hot-pressed article using the adhesive composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive composition exhibiting excellent releasability in the production of a molded article with a lignocellulosic material, a hot- pressed article having excellent hot-water resistance, etc., and produced by using the adhesive composition and a method for producing the hot-pressed article. SOLUTION: The adhesive composition for hot-pressed lignocellulosic article is composed of (A) an organic polyisocyanate and (B) a wax emulsion obtained by emulsifying (B1) a wax with (B2) an emulsifier and having an acid value of <=10 mgKOH/g. The melting point of the wax B1 is 40-160 deg.C and the emulsifier B2 is an addition polymer of ethylene oxide and a >=9C aliphatic monoalcohol and having a number-average molecular weight of 100-500. A hot-pressed article is produced by using the adhesive composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lignocellulose-based adhesive composition for hot-pressed product comprising an organic polyisocyanate and a wax emulsion, and a method for producing a hot-pressed product using the same. More specifically, the present invention relates to an adhesive composition having excellent releasability, hot water resistance, and the like in the production of a hot-pressed product using a lignocellulose-based material, and a method for producing the hot-pressed product.

[0002]

2. Description of the Related Art Conventionally, urea resins, melamine resins, urea melamine resins have been used as adhesives for hot-pressed bodies (boards such as particle boards and medium density fiber boards) of lignocellulosic materials such as wood chips and wood fibers. Formalin-based adhesives such as phenol resin and phenol melamine resin have been used, but it has become necessary to reduce the formalin released from the adhesive as recently seen, for example, in the problem of sick house syndrome. In addition to the feature that the organic polyisocyanate resin as a non-formalin-based adhesive does not contain formalin in its structure,
It has been used due to its excellent adhesive properties such as hot water resistance. However, when an organic polyisocyanate resin is used as an adhesive for the hot-pressed body, the metal surface (hereinafter referred to as a hot platen) that contacts when hot-pressed by a continuous or batch-type press due to its excellent adhesiveness. ) Occurs, and the hot-pressed body cannot be stably manufactured continuously.

[0003]

In order to solve the problem of adhesion to the hot platen, a release agent (hereinafter referred to as an external release agent) is applied directly to the hot platen before hot pressing. A method has been proposed in JP-A-52-154875 and the like. On the other hand, a method of mixing an additive (hereinafter, referred to as an internal release agent) with an organic polyisocyanate, instead of a method of applying an external release agent, is disclosed in JP-A-59-205175 and JP-A-59-205175. JP-A-57-113053, JP-A-1-19857
No. 2 publication and the like. In addition, Japanese Unexamined Patent Publication No.
Japanese Patent No. 232004 proposes a method of hot-pressing a lignocellulosic material by adding a neutral ester of orthophosphoric acid as a compatibilizer between an emulsion wax and an organic polyisocyanate. A liquid mixture of wax and orthophosphoric acid neutral ester which cannot be easily obtained cannot be obtained, and there is a problem in handling the emulsion wax.

However, in the method using an external release agent, it is necessary to appropriately apply the external release agent to a hot platen in order to secure continuous release properties, which makes the application work difficult and complicated. There is a problem of having. On the other hand, in the method using the internal mold release agent, it is necessary to use a large amount of the internal mold release agent in order to exert a sufficient mold release effect. In an actual manufacturing process, there are difficulties in terms of long-term sustainability and economical efficiency, and it has not yet been applied directly to the current production process.

[0005]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that an adhesive composition comprising an organic polyisocyanate compound and a wax emulsion having a specific composition is used for a hot press molding of a lignocellulose material. The inventors have found that the above-mentioned problems can be solved as an adhesive composition, and have completed the present invention.

That is, the present invention provides the following (1) to (5)
It is shown in. (1) An acid value obtained by emulsifying an organic polyisocyanate (A) and a wax (B1) with an emulsifier (B2) is 10 m.
a wax emulsion (B) having a gKOH / g or less,
A lignocellulose-based adhesive composition for a hot-pressed body, comprising: a wax (B1) having a melting point of 40 to 160 ° C;
The adhesive composition, wherein the emulsifier (B2) is an ethylene oxide polyadduct (B2) of an aliphatic monoalcohol having a number average molecular weight of 100 to 500 and a carbon number of 9 or more.

(2) The adhesive composition according to the above (1), wherein the aliphatic monoalcohol having 9 or more carbon atoms is stearyl alcohol.

(3) The adhesive composition according to (1) or (2), wherein the wax (B2) is a paraffin wax.

(4) Formalin condensation resin (C)
The adhesive composition according to any one of the above (1) to (3), comprising:

(5) A method for producing a lignocellulose-based hot-pressed article, characterized by using the adhesive according to any one of (1) to (4).

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the components of the adhesive composition of the present invention will be described. The organic polyisocyanate (A) used in the present invention is preferably of a type having good compatibility with the wax emulsion (B) described later, such as the mixing property of each adhesive component and the workability in application to a lignocellulosic material. Considering that the viscosity at 25 ° C. is 500 mP
a · s or less are preferable, and in particular, 10 to 400 mPa
S is preferred. Further, the isocyanate content of (A) is preferably from 20 to 35% by mass, particularly preferably from 28 to 32% by mass.

As the organic polyisocyanate (A), diphenylmethane diisocyanate (hereinafter referred to as MDI)
A mixture of MDI and an MDI-based polynuclear condensate (hereinafter referred to as polymeric MDI), liquid MDI (carbodiimide-modified MDI), tolylene diisocyanate, xylylene diisocyanate, trimethylene xylylene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, Examples include naphthalenediisocyanate, hydrogenated diphenylmethane diisocyanate, and hydrogenated xylylene diisocyanate. Further, a part of the isocyanate group may be modified to biuret, allophanate, carbodiimide, uretonimine, oxazolidone, amide, imide, isocyanurate, uretdione, or the like. These can be used alone or 2
It may be a mixture of more than one species.

Further, as the organic polyisocyanate (A), an isocyanate group-terminated prepolymer obtained by reacting the polyisocyanate with an active hydrogen group-containing compound can also be suitably used. When reacting the polyisocyanate with the active hydrogen group-containing compound, the equivalent ratio of the isocyanate group to the active hydrogen group (isocyanate group / active hydrogen group) is preferably 1.5 to 500, more preferably 2 to 400. .

The number average molecular weight of the active hydrogen group-containing compound is preferably from 32 to 10,000, particularly preferably from 100 to 50,000.
00 is preferred. The average number of functional groups is preferably 1 or more, and particularly preferably 1 to 4. Specific examples include low molecular monools having a molecular weight of less than 500, low molecular polyols, low molecular monoamines, low molecular polyamines, low molecular amino alcohols, high molecular monools having a number average molecular weight of 500 or more, and high molecular polyols. These can be used alone or as a mixture of two or more.

As low molecular monols, methanol,
Examples include ethanol, propanol, butanol, octanol, lauryl alcohol, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, and the like.

Examples of the low molecular polyol include ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, 1,3-propanediol, dipropylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, cyclohexane-1,
4-diol, cyclohexane-1,4-dimethanol, hydrogenated bisphenol A, glycerin, trimethylolpropane, pentaerythritol, sorbitol, sucrose, diglycerin and the like.

The low molecular weight monoamine includes ethylamine, propylamine, butylamine, diethylamine,
Examples include dibutylamine, aniline, N-methylaniline and the like.

Examples of low molecular weight polyamines include tetramethylenediamine, hexamethylenediamine, tolylenediamine, 4,4'-diaminodiphenylmethane, 3,3'-
Dimethyl-4,4'-diaminodicyclohexylmethane, diethyltriamine, dibutyltriamine, dipropylenetriamine and the like can be mentioned.

Examples of the low molecular weight amino alcohol include monoethanolamine, diethanolamine, triethanolamine, N-methylethanolamine, N-methyldiethanolamine, N-ethylethanolamine, Nn
-Butylethanolamine, Nn-butyldiethanolamine, N- (β-aminoethyl) ethanolamine, N- (β-aminoethyl) isopropanolamine and the like.

As the high molecular monool, ethylene oxide, propylene oxide, a compound having one active hydrogen such as a secondary amine, monothiol or phenol among the above low molecular monools and low molecular monoamines is used as an initiator. Styrene oxide, polyether monool polycyclic addition of cyclic ethers such as tetrahydrofuran,
A polyester monool to which a cyclic ester monomer such as ε-caprolactam and γ-valerolactone is polyadded using a compound having one as an initiator is exemplified.

Examples of the polymer polyol include polyether polyols, hydroxyl-containing amine polyethers, polyoxyethylene monoalkyl ethers, dibasic acids such as adipic acid and phthalic anhydride, and glycols such as ethylene glycol, diethylene glycol and trimethylolpropane. Polyester polyols obtained by dehydration condensation reaction with triol and triol, lactone-based polyols obtained by ring-opening polymerization of cyclic ester monomers such as ε-caprolactam, polycarbonate polyols, acrylic polyols, polybutadiene-based polyols, novolak resins and resol resins, etc. Phenolic polyols, and so-called polymer polyols obtained by radical polymerization of vinyl monomers such as acrylonitrile and styrene in the polyol. .

In the present invention, polymeric MDI and isocyanate group-terminated urethane prepolymers obtained by reacting polymeric MDI with a hydroxyl group-containing polyether having a number average molecular weight of 100 to 5,000 are preferred. This polymeric MDI is, for example, a condensation mixture (polyamine) obtained by a condensation reaction between aniline and formalin.
Means a mixture of organic isocyanate compounds having different degrees of condensation obtained by converting an amino group into an isocyanate group by phosgenation or the like. Polymeric M
A variety of DI compositions can be obtained by changing the raw material composition ratio and reaction conditions during the condensation of aniline and formalin, the mixing ratio of various polymeric MDIs, and the like. Polymeric MDI is obtained by removing the solvent from the reaction solution after the conversion to isocyanate groups, or removing the solvent from the reaction solution, or removing the MDI partially by distilling off the MDI, or using a mixture of several types having different reaction conditions and separation conditions. And further added MDI.

The most preferred composition of polymeric MDI is to have two isocyanate groups and two benzene rings in one molecule.
20 to 70% by mass of a so-called binuclear body (MDI) having three isocyanate groups and three benzene rings in one molecule.
It is a mixture containing 80 to 30% by mass of a so-called polynuclear mixture having at least two, and preferably a mixture containing 30 to 60% by mass of binuclear and 70 to 40% by mass of polynuclear mixture.

The purpose of the wax emulsion (B) in the present invention is as an effect as a release agent for avoiding adhesiveness to a hot platen. The wax emulsion (B) is composed of the wax (B1) and the emulsifier (B
2). The wax emulsion (B) preferably has a solid content of 10 to 60% by mass.
The mass ratio between the wax (B1) and the emulsifier (B2) is as follows:
(B1) / (B2) = 100/1 to 100/30 are preferable, and particularly (B1) / (B2) = 100/5 to 100 /
25 is preferred.

The acid value of the wax emulsion (B) is 10 mgKOH / g or less, preferably 5 mgKOH / g.
KOH / g. When the acid value is more than 10 mgKOH / g, the reaction between the organic polyisocyanate used as the component (A) and the active hydrogen groups contained in water or the lignocellulose-based material is inhibited, and a molded article having high physical properties is obtained. I can't.

The melting point of the wax (B1) is 40 to 1
60 ° C. When the melting point of the wax (B1) is lower than 40 ° C., the normal hot pressing temperature of 100 to 200 ° C.
Under the conditions described above, it is easy to evaporate and evaporate, and it is difficult to exhibit releasability. On the other hand, when the melting point is 160 ° C. or more, even if the hot-pressing temperature is 200 ° C., the temperature inside the molded body does not always rise to that temperature within the molding time. Heat transfer to the surface of the molded article becomes difficult, and the mold release property from the hot plate cannot be exhibited. Also, it is difficult to obtain a stable wax emulsion.

Examples of the wax (B1) include natural waxes such as paraffin wax, montan wax, carnauba wax and rice wax, and synthetic waxes such as paraffin wax derivatives, montan wax derivatives, hardened castor oil, and stearamide. No. Among them, paraffin-based wax, that is, paraffin wax and its derivatives, are preferred because they exhibit good releasability and, as a secondary effect, give a good effect on the hot water resistance of the hot-pressed product.

Further, the wax (B1) has a molecular weight range of 10% in terms of the molecular weight determined by gel permeation chromatography (GPC) using polystyrene.
It is preferably from 0 to 10,000. Wax (B
If the number of components having a molecular weight of less than 100 in 1) is large, evaporation and vaporization are likely to occur under the normal hot-pressing temperature of 100 to 200 ° C., making it difficult to exhibit releasability. Further, when there are many components having a molecular weight exceeding 10,000, the stability of the wax emulsion (B becomes poor and the compatibility with the organic polyisocyanate (A) decreases, and the melting point becomes relatively high. It is difficult for the wax component to transfer heat to the surface of the molded product, so that the wax component cannot exhibit mold releasability from the hot platen, and a component having a molecular weight of 100 to 1,000 has a peak area ratio of 80% or more. The number average molecular weight can be measured by various methods.
According to C.

Further, in the infrared absorption analysis of wax (B1) (IR analysis), the absorbance ratio of the peak (methylene group) peak 1700～1760Cm ^-1 and (carbonyl group) 2900~2960cm ^-1 (1700~ 1760
cm ^-1 peak absorbance / 2900～2960Cm absorbance peak of ^-1) is 0.1 or less, preferably is preferable 0.05 or less. The wax having a large absorbance ratio is often difficult to exhibit the releasability from the hot platen.

The emulsifier (B2) used for emulsifying the wax has a number average molecular weight of 100 to 500.
Is an ethylene oxide polyadduct of an aliphatic monoalcohol having 9 or more carbon atoms. If the number average molecular weight is more than 500, the compatibility with the wax is lowered, so that not only the liquid stability of the wax emulsion (B) is lowered, but also the melting point of the wax emulsion is increased, so that the release agent is used during hot pressing. Becomes difficult to move to the surface of the molded product, and the releasability from the hot plate is deteriorated.

In the present invention, as the emulsifier (B2),
The use of an ethylene oxide polyadduct of an aliphatic monoalcohol having a number average molecular weight of 500 or less and a carbon number of 9 or more has a large effect as a surfactant in the emulsification of wax, and also exhibits an effect on mold release properties. To find something to do. That is, the aliphatic hydrocarbon structure having 9 or more carbon atoms is effective not only for the compatibility with the wax (B1) but also for improving the releasability from the hot platen, while the polyoxyethylene structure is hydrophilic. A wax emulsion (B) having good liquid stability can be formed because it is effective for improvement.

Examples of the aliphatic monoalcohol having 9 or more carbon atoms include nonyl alcohol (nonanol), decyl alcohol (decanol), undecyl alcohol (undecanol), lauryl alcohol (dodecanol), tridecyl alcohol (tridecanol), and myristyl alcohol. (Tetradecanol), pentadecanol, cetyl alcohol (hexadecanol), heptadecanol, stearyl alcohol (octadecanol), nonadecanol, and isomers thereof. They are,
A single compound or a mixture of two or more compounds can be used.

(B1) can be obtained by addition polymerization of ethylene oxide to the above-mentioned aliphatic monoalcohol having 9 or more carbon atoms alone or in a mixture by a known method. In the present invention, particularly, an ethylene oxide polyadduct of stearyl alcohol having a number average molecular weight of 250 to 500 is preferable.

If necessary, other emulsifiers such as polyoxyalkylene alkyl ether, polyoxyalkylene alkyl allyl ether, polyoxyalkylene alkyl ester, polyoxyalkylene alkylamine, polyoxyalkylene phenyl ether, polyoxyalkylene alkyl ether sulfone It is possible to use compounds such as acid salts, polyoxyalkylene phenyl ether sulfonates, alkylenedisulfonates, dialkyl succinate sulfonates, alkylbenzene sulfonates, dialkylaryl sulfonates, and the like.

As the formalin condensation resin (C), urea resin, melamine resin, urea melamine co-condensation resin, phenol resin, phenol melamine co-condensation resin and the like can be mixed and used. In the present invention, (C)
It is preferable to use a low-formalin type resin (the molar ratio at the time of condensation, formalin / other raw material compound is 1.0 to 1.1) or a formalin catcher agent such as urea or ammonia. . The mixing ratio of the component (C) to the component (A) is a mass ratio in terms of solid content,
(A) component / (C) component = 5/95 to 95/5 is preferable, and particularly, 10/90 to 90/10 is preferable.

In the present invention, an active hydrogen group-containing compound can be used in combination for the purpose of controlling the physical properties of the obtained hot-pressed product. Examples of the active hydrogen group-containing compound include those used for obtaining the above-mentioned isocyanate group-terminated prepolymer.

Examples of the compound containing an active hydrogen group include polyoxyalkylene polyamines having an oxyalkylene structure in the molecule. For example, as polyoxypropylene diamine, Jeffamine D-200
0 (manufactured by Huntsman Specialty Chemicals,
As an amine equivalent of about 1000) or polyoxypropylene triamine, Tech Slim TR-5050 (manufactured by Huntsman Specialty Chemicals), an amine equivalent of about 1
930), Jeffamine T-403 (manufactured by Huntsman Specialty Chemicals, amine equivalent: about 16)
0) and the like.

In the present invention, the following known catalysts can be used. This catalyst comprises the component (A) and the component (B)
It also acts as a catalyst for accelerating reaction hardening with the components and the lignocellulosic material.

Specific examples of the tertiary amine catalyst include triethylamine, triethylenediamine, N-methylmorpholine, N-methylimidazole, 1-methylimidazole, 1-ethylimidazole, 1-propylimidazole, 1-cyanoimidazole, Cyanomethylimidazole, 1,2-dimethylimidazole, 1,4-dimethylimidazole, 1-methyl-2-ethylimidazole, 1-methyl-4-ethylimidazole, 1-ethyl-2-methylimidazole, 1-ethyl-4 Catalysts such as -methylimidazole, pyridine, α-picoline and the like.

Examples of the amine catalyst having an active hydrogen that reacts with the polyisocyanate composition include monoethanolamine, diethanolamine, triethanolamine, N, N, N'-trimethylaminoethylethanolamine, N, N, N '. , N'-tetramethylhydroxypropylenediamine and the like can also be used.

Specific examples of the metal catalyst include dibutyltin dilaurate, dioctyltin dilaurate, calcium naphthenate, potassium octylate, tin octylate, and zinc octylate.

The amount of the catalyst component added to component (A) is preferably 0.1 to 20% by mass. If the addition amount is less than the lower limit, the curing reaction is insufficient, there is a tendency that it is difficult to obtain a hot-pressed body having the desired physical properties, and if it exceeds the upper limit, The curing reaction is too fast, and the lignocellulose-based material reacts and solidifies before the hot pressure on the hot platen, so that a normal hot-pressed product cannot be obtained.

The adhesive composition of the present invention may further contain, if necessary, an inorganic filler such as cement, blast furnace slag, gypsum, calcium carbonate, clay, aluminum hydroxide, antimony trioxide, quicklime, slaked lime, bentonite and the like. , A leveling agent, a flame retardant, an anti-aging agent, a heat resistance imparting agent, an antioxidant, and the like can be appropriately adjusted in amount.

Next, a method for producing a lignocellulose-based hot-pressed product will be described. The lignocellulose-based hot-pressed body is obtained by applying the above-mentioned adhesive composition to a lignocellulose-based material, followed by heating and compression.

Examples of the lignocellulose-based hot-pressed product obtained by the present invention include particle board, oriented strand board (OSB), wafer board, laminated veneer lumber (LVL), laminated strand lumber (LSL), and parallel Examples thereof include strand chips, dust chips, and flake chips, which are wood chips used for a strand lumbar (PSL), a hard board, a medium density fiberboard (MDF), and an insulation board.

Examples of the lignocellulosic material used in the present invention include fiber, kolyan stalk, bagasse, rice husk, hemp, straw, grass, reed, coconut and tree, rubber tree,
Corn, sawdust and the like. These may be used alone or in combination of two or more.

The amount (mass ratio) of the adhesive composition to the lignocellulosic material is determined by the following formula:
Organic polyisocyanate: wax emulsion = 10
0: 5 to 20: 0.5 to 10.

First, the above adhesive composition is applied to a lignocellulosic material. As this coating method, an organic polyisocyanate (A), a wax emulsion (B), a formalin condensed resin (C), and a catalyst, if necessary, are mixed immediately before being applied to the various lignocellulosic materials. Either use or apply each component separately. At this time, a mixed system to which water is added may be used.

When the production is carried out in a continuous line, a premix in which components other than the organic polyisocyanate (A) are previously mixed is continuously mixed with the organic polyisocyanate (A) by a static mixer, Apply to cellulosic material. Thereafter, after the adhesive composition is applied, the adhesive composition is formed on a hot platen and hot-pressed. The heat and pressure conditions can be applied to any known molding conditions. Preferred heat and pressure conditions are: temperature: 100 to 250 ° C., pressure: 1
-10 MPa, time (per 1 mm thickness): 6-30 seconds, temperature: 150-230 ° C., pressure: 2-
5 MPa, time (per 1 mm thickness): 6 to 15 seconds are particularly preferred.

[0050]

As described above, the use of the production method of the present invention not only prevents the adhesion of the lignocellulosic material such as wood chips and wood fibers to the surface of the hot platen at the time of hot pressing, but also allows the physical properties to be improved. A hot-pressed body of a lignocellulose-based material having excellent surface properties can be obtained.

[0051]

EXAMPLES Next, the adhesive composition for a lignocellulose-based hot-press molded article of the present invention and the production method using the same will be described in more detail with reference to Examples. However, the present invention is not limited to this.

Example 1 [Synthesis of Solution A] The type and amount of the raw materials shown in Table 1 were measured using a 2,000 ml reactor equipped with a stirrer, thermometer, cooler, and nitrogen gas inlet tube. After the charging, the temperature was raised to 80 ° C. and the reaction was carried out for 3 hours to synthesize organic polyisocyanates A1 to A5. The synthesis results are also shown in Table 1.

[0053]

[Table 1]

[Solution A for Synthesis of Liquid A] PMDI-1: Isocyanate content of polymeric MDI = 31.1% MDI content in polymeric MDI = 42% 4,4′-MDI content in MDI = 99% PMDI-2: Polymeric MDI Isocyanate content = 30.1% MDI content in polymeric MDI = 30% 4,4′-MDI content in MDI = 100% PPG-200: poly (oxypropylene) polyol Number average molecular weight = 200 average functionality Number of groups = 2 PEG-2000: poly (oxyethylene) polyol Number average molecular weight = 2,000 Average number of functional groups = 2 MPEG-700: Methoxy polyethylene glycol Number average molecular weight = 700 Average number of functional groups = 1

[Preparation of Adhesive Composition] An adhesive composition for a lignocellulosic material was prepared by combining the organic polyisocyanates A1 to A5 obtained in Table 1 above with the wax emulsions shown below. Table 2 shows the charged amounts of the respective adhesive compositions and the evaluation results. In Comparative Example 1, the physical properties could not be evaluated because the molded product adhered very firmly to the hot platen because the release agent was not used.

[0056]

[Table 2]

[Examples 1 to 4, Comparative Examples 1 to 4] [Component B] P: paraffinic wax emulsion Acid value = 1 mg KOH / g solid content = 30%) Wax (B1) Width of molecular weight in terms of polystyrene by GPC = 200-
7,000 GPC peak area ratio of 100 to 1,000 molecular weight = 8
8.8% Absorbance ratio by IR analysis = 0.03 (peak at 1700 to 1760 cm ⁻¹ / 2900 to 29
60cm ^-1 peak) mp = 45 ° C. emulsifier (B2) of stearyl alcohol ethylene oxide polyaddition body number average molecular weight = 350 (B1) :( B2) = 100: 15 Q: montanic acid wax emulsions acid number = 23 mg KOH / G solid content = 30%) Wax (B1) Width of molecular weight in terms of polystyrene by GPC = 200 to
7,000 GPC peak area ratio of 100 to 1,000 molecular weight = 8
2.3% Absorbance ratio by IR analysis = 0.05 (peak at 1700 to 1760 cm ⁻¹ / 2900 to 29
60cm ^-1 peak) mp = 53 ° C. emulsifier (B2) of stearyl alcohol ethylene oxide polyaddition body number average molecular weight = 350 (B1) :( B2) = 100: 15 R: carnauba based wax emulsion acid number = 1 mgKOH / g Solid content = 30% Wax (B1) Width of molecular weight in terms of polystyrene by GPC = 70 to 2
Peak area ratio of 2,000 GPC with a molecular weight of 100 to 1,000 = 2
3.1% Absorbance ratio by IR analysis = 0.17 (peak of 1700 to 1760 cm ⁻¹ / 2900 to 29
60cm peak of ^-1) mp = 45 ° C. emulsifier (B2) diethyl succinate sulfonate (B1) :( B2) = 100 : 15 [C Component] M: urea melamine co-condensation resin (molar ratio = 1.05, (Solid content = 50%) [Catalyst] Catalyst S: Triethylenediamine

[Method for Forming Hot-Pressed Molded Article of Lignocellulosic Material] (1) Molding conditions Board size: 40 cm × 40 cm Board thickness: 15 mm Set density: 0.720 g / cm ³ Water content of wood chip or wood fiber and Tree species: 3%, softwood Product moisture content: 9% Matt moisture content: 16% Hot platen (press) temperature: 160 ° C Hot platen (press) pressure: 30 kg / cm ² (surface pressure) Hot platen (press) time: 150 Second

(2) Forming Method Regarding the preparation of the hot-pressed molded body shown in Table 2, the following (A) was used for the particle boards (Examples 1 and 2 and Comparative Examples 1 and 2) obtained by using wood chips. ), And medium-density fiberboards (Examples 3 and 4 and Comparative Examples 3 and 4) obtained using wood fibers were prepared by the following method (B). (B) Method of preparing hot-pressed bodies of Examples 1 and 2 and Comparative Examples 1 and 2 Wood chips of coniferous wood in an amount shown in Table 2 were put into a blender having a stirring blade with a volume of about 0.5 m ^3. And there Table 2
A mixture of the organic polyisocyanate compound, the wax emulsion, the amine catalyst and the water for the mat moisture content in the amount described in (1) was spray-applied for about 10 minutes while mixing and stirring. Thereafter, the wood chip to which the adhesive composition was applied was taken out, weighed so that the density of the hot-pressed body after molding became the set density, and formed on the following iron plate so as to have the board size. Then, an iron plate having the same shape was placed thereon, and hot-pressed under the above conditions. (B) Preparation method of hot-pressed bodies of Examples 3 and 4 and Comparative Examples 3 and 4 Wood chips of conifers in the amounts shown in Table 2 were digested using a pressurized refiner at a cooking pressure of 0.7 MPa and a cooking temperature. = 12
It was defibrated (fibrillated) at 0 ° C. Pass it through the plumbing,
After spraying a mixture of an organic polyisocyanate compound, a wax emulsion, an amine catalyst, and water for a mat moisture content in the amount shown in Table 2, the mixture was dried until the mat moisture content was reached by continuously passing through a pipe. .
Thereafter, the wood fiber coated with the adhesive composition is taken out, weighed so that the density of the hot-pressed body after molding becomes a set density, and formed on an iron plate described below so as to have the board size. Forming was performed using an apparatus, and an iron plate having the same shape was placed thereon, and was subjected to hot pressing under the above conditions.

[Confirmation of Releasability] An iron plate (SPCC-SB) manufactured by Nippon Test Panel was placed on the upper and lower sides of the board, and the releasability was confirmed during the molding. [Measurement of Physical Properties] Regarding various physical property values of the hot-pressed products of Examples 1 and 2 and Comparative Examples 1 and 2 in Table 2, JIS-A5908
The physical properties of the hot-pressed molded articles of Examples 3 and 4 and Comparative Examples 3 and 4 were measured according to JIS-A5905.

As shown in Table 2, the lignocellulose-based hot-pressed product using the backing composition of the present invention exhibited good physical properties and productivity. However, in the comparative example,
The productivity was low, and the physical properties of the obtained lignocellulose-based hot-pressed product were also low.

[Procedure amendment]

[Submission date] December 25, 2000 (200.12.
25)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

(3) The adhesive composition according to (1) or (2), wherein the wax (B 1 ) is a paraffinic wax.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09J 175/04 C09J 175/04 F term (Reference) 2B260 AA02 AA03 AA20 BA07 BA08 BA18 BA19 CB01 DA05 DB13 DB21 DC20 EA01 EA05 EB02 EB06 EB13 EB19 EB21 4F211 AD06 AD08 AG02 AG03 AH46 TA03 TC02 TD11 TH06 TN42 TN47 TQ04 4J040 BA171 BA181 EB032 EB112 EB132 EE052 EF052 EF072 EF112 EF132 EF292 EF302 EF322 001

Claims (5)

[Claims] 1. A lignocellulose-based hot-press molding comprising an organic polyisocyanate (A) and a wax emulsion (B) obtained by emulsifying a wax (B1) with an emulsifier (B2) and having an acid value of 10 mg KOH / g or less. A body adhesive composition, wherein the melting point of the wax (B1) is 40 to 1
60 ° C., the emulsifier (B2) has a number average molecular weight of 100 to 50
The adhesive composition, which is an ethylene oxide polyadduct (B2) of an aliphatic monoalcohol having 0 and having 9 or more carbon atoms. 2. The adhesive composition according to claim 1, wherein the aliphatic monoalcohol having 9 or more carbon atoms is stearyl alcohol. 3. The adhesive composition according to claim 1, wherein the wax (B2) is a paraffin wax. 4. The adhesive composition according to claim 1, further comprising a formalin condensation resin (C). 5. A method for producing a lignocellulose-based hot-pressed body, comprising using the adhesive according to claim 1.