JPH10180722A - Manufacture of lignocellulose molded plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the stability of an adhesive by a method in an adhesive for a lignocellulose molded plate, the mixed liquid of water, polyether, etc., and an organic polyisocyanate compound are emulsified, and the emulsion is incorporated with the metal salt of saturated and/or unsaturated aliphatic carboxylic acid of a specified number of carbon atoms. SOLUTION: The mixed liquid of water, polyether and/or polyester polyol, which is an adhesive for a lignocellulose molded plate, and an organic polyisocyanate compound are emulsified with shear stress applied, and the emulsion is incorporated with the metal salt of saturated and/or unsaturated aliphatic carboxylic acid of the number of carbon atoms of 8-28. It is preferable that the number of functional groups of the polyether and/or the polyester polyol is 2-8, the content of the repeating unit -CH2 CH2 -O- of the polymers is 5-70wt.%, and 1-70 pts.wt. of the repeating unit to 100 pts.wt. of the isocyanate compound is contained in the emulsion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hot-pressed board using lignocellulose as a main raw material and an adhesive used in the method. Molded products using lignocellulose as the main raw material, when lignocellulose is wood chips, called particle board, besides particle board, wafer board using large chips,
Oriented strand board (OSB) in which elongated chips (strands) are arranged in one direction, and in the case of wood fiber (wood fiber), it is produced as insulation board, medium density fiber board (MDF), and hard board, It is used as floor material, wall material, door material, soundproof material, heat insulating material, tatami core material, furniture member, and automobile member.

[0002]

2. Description of the Related Art Conventionally, a fiberboard such as a particle board, a wafer board and a hard board, an MDF, and an insulation board, a rice hull board formed by molding rice hulls, a kollan board formed by molding kollan stalks, etc. As an adhesive or a binder for the production of a urea resin, a melamine resin, a urea melamine resin, a phenol melamine resin, a phenol resin or the like (hereinafter referred to as a formalin-based resin adhesive) which is thermosetting. Used. These resins are inexpensive, have excellent adhesive properties, and have characteristics of curing in a relatively short time. Formalin released from products after hot-press molding of these formalin-based resin adhesives is regarded as an environmental problem, and in actual use to reduce the amount of released formalin, the amount of free formalin in the adhesive is required. (For example, the molar ratio of formalin in the resin adhesive / the molar ratio of phenol, melamine, and urea is reduced), and a formalin catcher agent is used when the formalin-based resin adhesive is compounded. On the other hand, as an adhesive which is non-formalin-based and provides excellent board properties, use of an isocyanate-based adhesive for a board has been proposed (JP-A-57-131538, JP-A-57-1475).
No. 67, U.S. Pat. Nos. 3,557,263 and 3,636,199.
No., 3870665, 3919017, 39301
No. 10).

However, when an organic polyisocyanate-based compound is hot-pressed as an adhesive for a lignocellulose-based material, it adheres to a hot platen due to its excellent adhesiveness. Due to this adhesion, the molded product is damaged, the value as a product is significantly lost, and a great deal of labor is required to remove the attached material from the hot platen. In order to solve this problem, studies have been made on additives to the organic polyisocyanate-based compound in order to improve the releasability of the hot platen from the metal. For example, alkyl phosphates or pyrophosphates of organic polyisocyanates (Japanese Patent Publication No. 03-0180)
No. 68), a sulfonated compound (Japanese Patent Publication No. 05-03830)
No. 9), wax and liquid ester (JP-B-04-0)
No. 54390), aliphatic carboxylic acids (JP-A-58-36)
No. 430), polysiloxane compounds (JP-A-61-86).
No. 225), a fatty acid polymer (US Pat.
No. 4,933,232) and the like have been proposed.

Another method has been proposed in which a release agent is directly applied to a hot platen before hot pressing. For example, formation of a release layer using metal soap (Japanese Patent Laid-Open No. 52-15 / 1982)
4875), high boiling polyol (German Patent No. 1653)
178), the use of polysiloxane films with functional groups (GB 1359592), and coating with polytetrafluoroethylene (US Pat. No. 4,347,791). However, each of the above methods has various problems and cannot be used in actual manufacturing sites. At present, there is no technology that satisfies all of the steps, economy, and physical properties.

[0005]

The problem to be solved by the present invention is that an organic polyisocyanate-based adhesive is used to manufacture boards so as not to adhere to a hot platen, and the conventional method cannot be satisfied. It is to solve the problems of economy and physical properties and to produce high quality boards at low cost.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, the present invention relates to a method for producing a hot-pressed board using lignocellulose as a main raw material. Adhesion with improved releasability obtained by preparing an organic polyisocyanate adhesive comprising a polyol and water and then adding a metal salt of a saturated and / or unsaturated aliphatic carboxylic acid having 8 to 28 carbon atoms By using the agent composition, the adhesive does not adhere to the hot platen, so that the productivity is improved, and a method of manufacturing a hot-pressed board with improved physical properties such as water resistance has been found, and the present invention has been completed.

That is, the present invention provides (1) a water emulsion containing an organic polyisocyanate compound (A) and a polyether and / or polyester polyol polyol (B) as an adhesive for a lignocellulosic material. A lignocellulose molded plate to be used, wherein an adhesive is a saturated liquid having 8 to 28 carbon atoms after emulsifying a mixed solution of water and polyether and / or polyester polyol and an organic polyisocyanate compound under shear stress. And / or a method for producing a lignocellulose molded plate characterized by being obtained by mixing a metal salt of an unsaturated aliphatic carboxylic acid.

Preferably, (2) polyether and / or
Or the polyester polyol (B) has a functional group number of 2
8, wherein the repeating unit of —CH ₂ CH ₂ —O— in the structure is 5 to 70% based on the weight of (B), and the organic polyisocyanate compound (A) 100
1 to 70 parts by weight with respect to parts by weight, the method for producing a lignocellulose molded plate according to the above (1),
(3) The method for producing a lignocellulose molded plate according to (1), wherein the organic polyisocyanate-based compound (A) is polymethylene polyphenyl polyisocyanate; (4) polyether and / or polyester The polyol (B) is an amine polyol containing a nitrogen atom in the molecule, (1) the method for producing a lignocellulose molded plate according to (1), and (5) a carbon number 8
A metal salt (C) of a saturated and / or unsaturated aliphatic carboxylic acid having -28, octylic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid,
The linoleic acid, linolenic acid, arachinic acid, lignoceric acid or behenic acid and at least one or more of zinc, iron, aluminum, calcium, zirconium, magnesium, barium, nickel, copper or cobalt. This is a method for producing a lignocellulose molded plate of 1). Further, after emulsifying water, a polyether and / or polyester polyol mixed solution and an organic polyisocyanate compound under shear stress used in these production methods, it is saturated and / or unsaturated having 8 to 28 carbon atoms. An adhesive obtained by mixing a metal salt of an aliphatic carboxylic acid.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The method for producing a lignocellulose molded plate (hereinafter sometimes referred to as a board) in the present invention is an adhesive comprising a lignocellulosic material, an organic polyisocyanate compound, a polyether and / or polyester polyol, and water. Is prepared, an adhesive composition (binder) having an improved releasability mixed with a metal salt of a saturated and / or unsaturated aliphatic carboxylic acid having 8 to 28 carbon atoms is applied, and then hot-pressed. This is a method in which the surface is polished if necessary to obtain a product board.

Examples of lignocellulosic materials include strand chips, dust chips, and flake chips used for particle boards, fibers used for hard boards, MDF, and insulation boards, and agricultural products such as kollan stalks, pagasu, and rice husks. Can be These raw materials may be used alone or in combination of two or more.

The organic polyisocyanate compound (A) (hereinafter referred to as polyisocyanate (A)) may be any substance having an isocyanate group. Examples thereof include tolylene diisocyanate and 4,4. '-Diphenylmethane diisocyanate, hexamethylene diisocyanate, xylene diisocyanate, isophorone diisocyanate, norbornene diisocyanate, polymethylene polyphenyl polyisocyanate (Polymeric M
DI) or a modified isocyanate obtained by modifying the above polyisocyanate compound with a compound having at least one active hydrogen. Among them, polymeric MDI is desirable from the viewpoint of economy.

The polyether and / or polyester polyol (B) (hereinafter referred to as polyol (B)) is a polyol having 2 to 8 functional groups and a hydroxyl value (OHv) of 24 to 800 mgKOH / g,
The repeating unit of ₂ CH ₂ —O— may be 5 to 70% with respect to the polyol (B). If it is less than 5%, the emulsifying performance is insufficient, so that it is not preferable.

As the polyether polyol, a low molecular weight compound having two or more active hydrogens as an initiator may be used in the absence of an alkylene oxide having an epoxy group in a molecule such as ethylene oxide, propylene oxide, butylene oxide or styrene oxide without a catalyst. Alternatively, it is produced by adding a catalyst using an alkali metal hydroxide, a tertiary amine or the like as a catalyst in a known manner for the production of a polyol. Initiators include glycerin, sucrose, pentaerythritol, sorbitol, trimethylolpropane, diglycerin, propylene glycol,
Alcohols such as dipropylene glycol, diethylene glycol, ethylene glycol, 1,4-butanediol, and 1,2-butanediol; phenols such as hydroquinone, bisphenol A and novolak; and ethanol such as monoethanolamine, diethanolamine and triethanolamine. Amines, ethylenediamine, diethylenetriamine, orthotolylenediamine, metatolylenediamine, 4,4′-diphenylmethanediamine,
Examples thereof include amines such as 2,4'-diphenylmethanediamine and polymethylpolyphenylpolyamine, and these are used alone or as a mixture. Preferably, the initiator is an amine polyol containing a nitrogen atom in the molecule of the amines.

The polyester polyol is obtained by an addition reaction between a carboxylic anhydride and an alcohol, a polycondensation reaction between a polycarboxylic acid and an alcohol, and addition of an alkylene oxide to an acid. Examples of carboxylic acid anhydrides include, for example, maleic anhydride, succinic anhydride, trimellitic anhydride, pyromellitic anhydride, itaconic anhydride, phthalic anhydride, glutaric anhydride, glutaconic anhydride, diglycolic anhydride, citraconic anhydride Acid, diphenic anhydride, toluic anhydride and the like, and as the polycarboxylic acid, for example, maleic acid, terephthalic acid, dimethyl terephthalic acid, isophthalic acid, fumaric acid, oxalic acid,
Malonic acid, glutaric acid, adipic acid, pimelic acid, speric acid, azelaic acid, sebacic acid, citric acid, trimellitic acid and the like. Also, as alcohol,
The alcohols, phenols, or alkylene oxide adducts of the above-mentioned initiators can be used.

The metal salt of a saturated and / or unsaturated aliphatic carboxylic acid having 8 to 28 carbon atoms (C) (hereinafter referred to as a metal salt of a carboxylic acid) has the following acid components:
Any of mono, di and tri functional groups can be used, but among them, straight-chain aliphatic monocarboxylic acids having 12 to 22 carbon atoms are preferred. For example, octylic acid, lauric acid,
Examples thereof include aliphatic carboxylic acids such as myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, arachinic acid, lignoceric acid, and behenic acid. Examples of the metal component include zinc, iron, aluminum, calcium, zirconium, magnesium, barium, nickel, copper, and cobalt. These can be used in combination of at least one selected from the group consisting of an acid component and a metal component. That is, an acid component selected from the group consisting of the above preferred carboxylic acids,
A metal salt of a carboxylic acid composed of a metal component selected from the group consisting of the preferred metals described above can be used alone or as a mixture of two or more. The adhesive used in the present invention is obtained by emulsifying a mixture containing the above-mentioned polyisocyanate (A), polyol (B) and water, and then mixing a metal salt of carboxylic acid (C).

The method of emulsifying the mixed solution containing the polyisocyanate (A), the polyol (B) and water under shear stress is not particularly limited, and various means and methods can be applied.
For example, polyisocyanate (A) and polyol (B)
And water may be simultaneously mixed at high speed to emulsify the mixture, or a polyisocyanate (A) may be added to a mixture of the polyol and water while adding shear stress to emulsify the mixture. After mixing (B) and polyisocyanate (A), they may be added to water and emulsified while applying shear stress. The mixing system may be a batch system or a continuous system.
A homogenizer, a static mixer or the like can be used.
The mixing ratio of the polyisocyanate (A) and the polyol (B) is (A) :( B) = 100: 1 to 100:
70, preferably 100: 5 to 100: 5
It is in the range of 0. That is, the polyol (B) is used in an amount of 1 to 70 parts by weight based on 100 parts by weight of the polyisocyanate (A). If the polyol (B) is less than 1 part by weight, a stable water emulsion will not be obtained, and if it exceeds 70 parts by weight, the physical properties of the board will be reduced.

The adhesive used in the present invention is obtained by emulsifying the polyisocyanate (A) and the polyol (B), and then adding a metal salt of a carboxylic acid (C) to the adhesive composition. The metal salt of the carboxylic acid (C) may be added so as to exist in the form of a metal salt of the carboxylic acid. The metal salt may be added in a solid state, or may be added in a state of a water emulsion of the metal salt. May be. The aliphatic carboxylic acid and the metal ion may be separately used and added. For example, the aliphatic carboxylic acid is dispersed in water, and the polyol (B) and the polyisocyanate (A) are added and emulsified. Thereafter, metal ions may be added to form a metal salt of a carboxylic acid in the adhesive composition.

The metal salt (C) of the carboxylic acid may be used as an emulsion using an emulsifier, if necessary. As the emulsifier in this case, a commonly used emulsifier may be used. Fatty acid soap, rosin acid soap, alkyl sulfonate, alkylbenzene sulfonate, dialkylaryl sulfonate, alkyl sulfosuccinate, polyoxyethylene alkyl sulfate Salts, anionic surfactants such as polyoxyethylene alkylaryl sulfonates, and surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkylaryl ethers, polyoxyethylene sorbitan fatty acid esters, and oxyethylene oxypropylene block copolymers. But
The present invention is not limited to these surfactants. Further, these surfactants may be used alone or in combination of two or more. Further, a stabilizer may be used if necessary. The stabilizer in this case may be any as long as it can stabilize the metal salt of carboxylic acid (C) and an emulsion thereof, such as a natural polymer compound or a synthetic polymer compound which forms a protective colloid. Can be used, for example, gelatin, gum arabic,
Carboxymethyl cellulose, polyvinyl alcohol and the like can be used.

The amount of the metal salt (C) of the carboxylic acid used may be an amount sufficient to release the boards from the coal board during hot pressing of the boards, and is 0 to the solid content of the adhesive. It is preferable to use 0.02 to 15% by weight. 0.0
If the amount is less than 2% by weight, the releasability is not sufficient, so that it is not preferable. The amount of water used depends on the amount of water in the lignocellulosic material, but it is sufficient that the adhesive can be uniformly mixed with the lignocellulosic material. Therefore, 1 to 300% by weight of the amount of the adhesive is preferable.

The above-mentioned adhesive is used in at least a layer in which a molded plate comes into contact with a hot plate of a molding machine in the production of a lignocellulose molded plate. In such a layer of the lignocellulose molded plate, the ratio of the adhesive and the lignocellulosic material used is determined by the weight ratio of the active ingredient of polyisocyanate (A) and polyol (B) in the adhesive and the lignocellulose material. In the range of 2: 100 to 30: 100, preferably in the range of 3: 100 to 20: 100. If the amount of the active ingredient is less than 2 parts by weight with respect to 100 parts by weight of the lignocellulosic material, the effect as an adhesive cannot be obtained, and if the amount is 30 parts by weight, sufficient board properties can be obtained. Use of the agent is industrially useless. The method for mixing the lignocellulosic material and the water emulsion as the adhesive of the present invention is to spray the water emulsion on the lignocellulose material in a blender or to use a similar device to add water to the lignocellulose material. It is desirable to mix the emulsion uniformly. At this time, if necessary, it may be used by diluting it with a solvent or water. In this case, diluting with water is preferable in terms of economy and safety.

For forming, it is efficient to form a lignocellulose layer containing an isocyanate-based adhesive with improved releasability in the method of the present invention as the outermost layer. The inner layer may be used as a lignocellulose layer using this adhesive, or an isocyanate adhesive containing no isocyanate (A) and polyol (B), which does not contain a metal salt of carboxylic acid (C); Alternatively, a lignocellulose layer using another adhesive may be used. The inner lignocellulose layer may be a single layer or a multilayer. If necessary, pre-pressing may be performed after lamination, or a pre-pressed mat may be laminated before lamination.

A method for forming a lignocellulose layer containing an isocyanate-based adhesive having improved releasability as the outermost layer may be formed at the time of forming. For example, the method for improving releasability on the lower surface of a hot platen may be used. After forming a lignocellulose layer using the isocyanate-based adhesive, a lignocellulose layer using the isocyanate-based adhesive is placed on the top, and further thereon an isocyanate-based adhesive with improved releasability is provided. May be used to form a lignocellulose layer.

The mixture of the adhesive and the lignocellulosic material is subjected to hot-pressing after forming, but it is possible to form a single layer into a plurality of layers at the time of forming. After the forming, pre-pressing may be performed before hot-pressing. The hot press may be a flat plate or a curved shape, since the heat only needs to be transmitted to the molding material, but a flat plate press is preferable in terms of continuous productivity and cost. Further, the press may be a continuous press or a multi-stage press. The board after hot pressing may be polished to a desired thickness and finished if necessary.

In the present invention, an antioxidant, an ultraviolet absorber, a plasticizer, a surfactant, a silane coupling agent, poval, a metal catalyst,
An internal release agent, an external release agent, a synthetic rubber latex, and an acrylic emulsion may be used in combination.

[0025]

The present invention will be described in more detail with reference to the following examples. However, these examples do not limit the present invention in any way. Tables 1 and 2 show the evaluation results in Examples and Comparative Examples. In the examples, parts and ratios are by weight unless otherwise specified. The common manufacturing conditions of the boards in the performance comparison are described below. Raw material: dust chips or wood fiber (water content 7.
0%) Board composition: Single layer or three layers Board thickness (excluding polished part): 10 mm Mat water content: 16% Hot pressing temperature: 180 ° C Press pressure: 35 kg / cm ² Pressing time: 130 seconds Setting density: 700 kg / m ^Three

Evaluation Test 1. Flexural strength A specimen was cut from a molded sample to a width of 50 mm and a length of 275 mm (span of 225 mm) in accordance with the test piece of “Fibreboard JIS-A-5905”, and a flexural strength test was performed. The results were expressed as normal bending strength. 2. Flexural strength when wet (A test)
The test piece was cut in the same manner as described above. Next, the test piece was
After being immersed in warm water of 3 ° C. for 2 hours and immersed in normal temperature water for 1 hour, a bending strength test was performed in a wet state. The results were expressed as wet A flexural strength. 3. Core peel strength A test piece was cut from a molded sample to a width of 50 mm and a length of 50 mm in accordance with the item of the test piece of “Fibreboard JIS-A-5905”, and a peel test was performed. The results were expressed as core peel strength. 4. Releasability Test At the time of hot pressing, a steel-made coal board was used, and the state of attachment of the chip to the cold board after hot pressing was visually confirmed. Perform this operation up to 30
The number of repetitions until the adhesion was confirmed was recorded. 5. Comprehensive evaluation Judgment of pass / fail according to JIS conformance standards of evaluation tests 1 to 4 was displayed. ○: Passed JIS conformance standard ×: Failed JIS conformity standard

Example 1 First, with the composition shown in Table 1, ethylenediamine was used as an initiator,
Propylene oxide / ethylene oxide block copolymer PPG
(Ethylene oxide content: 40% based on the total amount of PPG; hydroxyl value: 452 mg KOH / g) 17.6 parts were dissolved in 94.2 parts of water, and further, polymeric MDI (manufactured by Mitsui Toatsu Chemicals, Inc .; trade name Cosmonate) M-200) 56.2
The mixture was charged and emulsified while stirring at a high speed. After emulsification, an aqueous emulsion of zinc stearate as an internal release agent (solid concentration 3
(1%) was added and stirred uniformly. The obtained binder was good in both emulsified state and viscosity. The binder was immediately spray-applied to 1054 parts of a wood fiber as a lignocellulosic material in a blender using a spray gun. It was formed into a size of 30 cm square on a steel coiling board, covered with a steel coiling board, and hot-pressed under the above conditions. After hot pressing, adhesion to the steel coal board was observed, but no adhesion was observed. The board obtained by molding was used for comparison of physical properties, and the above operation was repeated using the same coal board again. No adhesion to the steel coal board was observed even after repeating 50 times.

Example 2 The board was composed of three layers, forming ratio: surface layer / core layer / surface layer = 25/50/25 (%), adhesive resin amount: surface layer / core layer = 8.5 / 6.5. The same operation as in Example 1 was performed except that the zinc stearate emulsion was not added to the binder of the core layer. Even after the operation was repeated 50 times, no adhesion to the steel coal board was observed.

Example 3 The same operation as in Example 1 was performed except that the used lignocellulosic material was changed to dust chips, and 10.0 parts of an emulsion of zinc stearate was used. Even after the operation was repeated 50 times, no adhesion to the steel coal board was observed.

Example 4 The same operation as in Example 1 was carried out except that the used zinc stearate was added in powder form and 2.0 parts of polyisocyanate was added after emulsification. Even after the operation was repeated 50 times, no adhesion to the steel coal board was observed.

Example 5 Example 1 was repeated except that the polyol initiator used was changed to triethanolamine (TEOA) (ethylene oxide content: 50%; hydroxyl value: 251 mg KOH / g), and the number of used parts was changed to 14.1 parts. The same operation was performed. Even after the operation was repeated 50 times, no adhesion to the steel coal board was observed.

Example 6 The same operation as in Example 1 was carried out except that the initiator of the polyol used was changed to orthotoluenediamine (OTD) (ethylene oxide content: 55%; hydroxyl value: 248 mgKOH / g). Even after the operation was repeated 50 times, no adhesion to the steel coal board was observed.

Example 7 The same operation as in Example 1 was carried out except that 7.0 parts of the polyol used in Example 1 and 3.5 parts of the polyol used in Example 5 were mixed and used. . Even after the operation was repeated 50 times, no adhesion to the steel coal board was observed.

Example 8 The same operation as in Example 1 was carried out except that a polyester polyol synthesized by esterifying the polyol used from 17.4 parts of the polyol used in Example 1 and 2.5 parts of phthalic anhydride was used. went. Even after the operation was repeated 50 times, no adhesion to the steel coal board was observed.

Comparative Example 1 Example 1 except that no emulsion of zinc stearate was used.
A board was formed using wood fiber in the same manner as described above. However, in all cases, adhesion to a steel coal board was observed, and the surface of the board was shaved in places and became uneven. Therefore, the subsequent evaluation of the physical properties of the board was not performed.

Comparative Examples 2 to 6 The powder of zinc stearate was dissolved in a polyol, mixed with water, and emulsified by adding polymeric MDI.
When the binder was prepared in the same manner as in Nos. 5 to 8, the binder was foamed and the viscosity increased, so that it was not possible to uniformly apply the lignocellulosic material using a spray gun.

Comparative Example 7 The initiator of the polyol used was changed to glycerin (G) (ethylene oxide content: 4%; hydroxyl value: 56 mg KOH /
g) The other operations were the same as in Example 1. When the board was formed, a puncture occurred when the pressure of the hot press was released.

[0038]

[Table 1]

[0039]

[Table 2]

[0040]

As is apparent from the above description, according to the method of the present invention, the heat which was practically unavoidable in the board manufacturing process using the conventional isocyanate-based adhesive was used.
There is no sticking to the board , the stability of the binder is improved, the productivity of the system is improved, and the molded board has good physical properties. Therefore, the method of the present invention is suitable as an industrial method for producing high-quality and inexpensive lignocellulose molded plates with high productivity.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // C08G 18/42 C08G 18/42 Z 18/48 18/48 Z (72) Inventor Taku Nago Kasama, Sakae-ku, Yokohama-shi, Kanagawa 1190 No.Machi Mitsui Toatsu Chemical Co., Ltd.

Claims (6)

[Claims] 1. Organic polyisocyanate compound (A)
And a polyether and / or polyester polyol in a method for producing a lignocellulose molded plate using a water emulsion containing a polyol (B) as an adhesive for a lignocellulose-based material, wherein the adhesive is water, polyether and / or polyester. After emulsifying the mixture of the polyol and the organic polyisocyanate-based compound, the mixture has 8 carbon atoms.
A method for producing a lignocellulose molded plate, which is obtained by mixing a saturated and / or unsaturated aliphatic carboxylic acid metal salt having the following formula: 2. The polyether and / or polyester polyol (B) has 2 to 8 functional groups, and the repeating unit of —CH ₂ CH ₂ —O— in the structure is a polyether and / or polyester polyol (B). 5 to 70% based on the weight of the organic polyisocyanate compound (A) in the aqueous emulsion.
The method for producing a lignocellulose molded plate according to claim 1, wherein the amount is 70 parts by weight. 3. Organic polyisocyanate compound (A)
Is a polymethylene polyphenyl polyisocyanate, The method for producing a lignocellulose molded plate according to claim 1, wherein 4. The process for producing a lignocellulose molded plate according to claim 1, wherein the polyether and / or polyester polyol (B) is an amine polyol containing a nitrogen atom in the molecule. 5. The metal salt (C) of a saturated and / or unsaturated aliphatic carboxylic acid having 8 to 28 carbon atoms is octylic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid. , Linolenic acid, arachinic acid, lignoceric acid or behenic acid, and zinc,
2. The material according to claim 1, wherein the material is at least one of iron, aluminum, calcium, zirconium, magnesium, barium, nickel, copper and cobalt.
The method for producing a lignocellulose molded plate according to the above. 6. After emulsifying a mixed solution of water and a polyether and / or polyester polyol (B) with an organic polyisocyanate compound (A) under shear stress, the mixture is saturated and / or having a carbon number of 8 to 28. Alternatively, an adhesive for a lignocellulose molded plate obtained by mixing a metal salt (C) of an unsaturated aliphatic carboxylic acid.