JP2001055401A - Production of lignocellulose formed board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for inexpensively and stably producing a high- quality board in good efficiency by which the board can be produced without causing a line trouble or the like caused by the adhesion of a reaction product of an organic isocyanate compound in a pipe when using an organic polyisocyanate-based adhesive. SOLUTION: This method for producing a formed board of a lignocellulose by using (A) an organic isocyanate compound and (B) an active hydrogen compound comprises mixing the component A regulated so as to have <=200 μm average particle diameter, with the lignocellulose. As a result, an efficient production is enabled because the adhesion of the polymer of the organic isocyanate compound to a mixing apparatus, a pipe or the like, which can not be avoided in a conventional process for producing the formed board of the lignocellulose by using an isocyanate-based binder, is eliminated.

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 plate using lignocellulose as a main raw material.

[0002]

2. Description of the Related Art A molded article using lignocellulose as a main raw material is called a particle board when lignocellulose is wood chip, and in addition to the particle board, a wafer board using a large chip and an elongated chip (strand) are used. Oriented strand board (OSB) arranged in the direction, in the case of wood fiber (fiber), insulation board, medium density fiber board (MDF), and hard board are produced and called floor material, wall material, door material, It is used as a soundproofing material, a heat insulating material, a tatami mat material, a furniture member, and a member for an automobile. Conventionally, production of particle board, wafer board, OSB, and hard board, MDF, insulation board, etc., fiber board, rice hull board formed by molding rice husk, kollan board formed by molding kollan stalk, etc. (hereinafter referred to as board) As an adhesive or a binder, thermosetting urea resin, melamine resin, urea melamine resin, phenol melamine resin, phenol resin and the like (hereinafter referred to as formalin-based resin adhesive) are widely used. I have. These resins are inexpensive, have excellent adhesive properties, and have characteristics of curing in a relatively short time. However, formalin released from products after hot pressing is regarded as an environmental problem, and in order to reduce the amount of released formalin, in actual use,
Improvements such as reducing the amount of free formalin in the adhesive (by reducing the formalin molar ratio of the resin adhesive / the molar ratio of phenol, melamine, and urea), and using a formalin catcher agent when compounding the formalin-based resin adhesive However, there is a problem such as deterioration of physical properties, and it is not yet sufficient. On the other hand, it is non-formalin,
Use of isocyanate-based adhesives for boards has also been proposed as an adhesive that provides excellent board properties. However, when an organic isocyanate compound is used as an adhesive for a lignocellulose-based material, the amount of the adhesive used is small due to excellent adhesiveness.Therefore, in actual use, the adhesive is diluted or diluted with an appropriate diluent. It has been said that it is preferable to add the lignocellulosic material after emulsification and dispersion to sufficiently improve the dispersibility. For the method of diluting an organic isocyanate compound with a diluent, for example, a method of modifying an organic polyisocyanate to impart hydrophilicity by diluting with water is disclosed, but modifying the organic isocyanate compound. This leads to an increase in cost and is not economically favorable. Further, a method of diluting an organic isocyanate compound with water by using an emulsifier has been disclosed.However, since these methods are characterized in that the organic isocyanate compound reacts with water due to its characteristics, the organic isocyanate compound emulsified with water is used. The compound gradually reacts with the surrounding water, causing a decrease in the adhesive capacity and the deposition of a reactant in the piping, and a decrease in the physical properties of the board and instability. Stopping, starting up, and prolonged operation cause various problems such as line clogging, flow rate reduction, and other process problems. In addition, as a method of diluting an organic isocyanate compound with water, a collision mixing method, a mixing method using a static mixer, a washing method, and the like are disclosed. However, if the amount of an adhesive or a diluent varies, it is obtained. Not only is the emulsified state of the emulsified product unstable, but also additives having poor compatibility with the organic isocyanate compound cannot be used. In addition, in these methods, even if the inside of the mixer is periodically washed with a detergent, it cannot be completely washed, and in the case of long-term use, the reaction product of the organic isocyanate compound and water as described above is still used. As a result, it becomes a scale and causes blockage or the like in the piping. As described above, each of the above methods has various problems such as high manufacturing cost and problems in the process, and cannot be endured for a long time at an actual manufacturing site. There is no technology that satisfies everything in terms of economy, economy and physical properties.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems in steps and physical properties which cannot be satisfied by the conventional method, and to use an organic polyisocyanate-based adhesive.
To provide a method for efficiently and inexpensively and stably producing a high-quality board which can be produced without causing a line trouble or the like caused by a reaction product of an organic isocyanate compound adhering to a pipe. It is.

[0004]

Means for Solving the Problems The present inventors diligently studied a method of applying an adhesive material component in a method of manufacturing a hot-pressed board using lignocellulose as a main raw material. The present inventors have found a method for solving the above-mentioned problem by spraying the particles to a particle size and mixing the particles with an active hydrogen compound and lignocellulose, thereby completing the present invention. That is, the present invention provides the following (1)
To (6). (1) A method for producing a lignocellulose molded plate using an organic isocyanate compound (A) and an active hydrogen compound (B), wherein the organic isocyanate compound (A) is mixed with lignocellulose with an average particle diameter of 200 μm or less. A method for producing a cellulose molded plate. (2) The method for producing a lignocellulose molded plate according to (1), wherein the discharge pressure of the organic isocyanate compound (A) is 5 N / mm ² or more. (3) The method for producing a lignocellulose molded plate according to (1), wherein the active hydrogen compound (B) has an average particle diameter of 500 μm or less upon discharge. (4) The organic isocyanate compound (A) and the active hydrogen compound (B) are sprayed by a double tube type spray device, and the organic isocyanate compound (A) is discharged from the center of the discharge port and the active hydrogen compound (B) (1) to (3), wherein the lignocellulose molded plate is discharged from its circumference. (5) The method for producing a lignocellulose molded plate according to any one of (1) to (4), wherein a curing accelerator (C) is further added to the active hydrogen compound (B). (6) A release agent (D) in addition to the active hydrogen compound (B)
(5) The method for producing a lignocellulose molded plate according to (5).

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the method for producing a molded plate of the present invention, particles of an organic isocyanate compound (A) having an average particle diameter of 100 μm or less, an active hydrogen compound (B) and lignocellulose are mixed, and then mixed. This is a method of pressing. These components can be used in combination with other additives as necessary. First, each component will be described.

[Lignocellulose] Lignocellulose used in the present invention is usually called a lignocellulose-based material (hereinafter, referred to as such), and specifically, strand chips and dust chips used for particle boards, wafer boards, OSBs, and the like. , Flake chips, fibers used for hard boards, MDF, insulation boards, and agricultural products such as kollan stalks, pagasu, and rice husks. These raw materials may be used alone or in combination of two or more.

[Organic isocyanate compound (A)] The organic isocyanate compound (A) in the present invention may be any compound having an isocyanate group, and can be used without any limitation. Specifically, for example, tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, xylene diisocyanate, isophorone diisocyanate, norbornene diisocyanate, polymethylene polyphenyl polyisocyanate (Polymeric MDI), and modified isocyanates obtained by modifying any of the above isocyanate compounds with a compound having at least one active hydrogen. Among them, polymeric MDI is preferred. The average particle size of the organic isocyanate (A) used in the production method of the present invention is 200 μm or less, preferably 100 μm or less, particularly preferably 50 μm or less.

[Active hydrogen compound (B)] The active hydrogen compound (B) used in the present invention is a compound having active hydrogen that substantially reacts with isocyanate. These can be used without any limitation, but water, ethylene glycol, propylene glycol, polyethylene glycol,
Polyols such as polypropylene glycol, other polyether polyols, and polyester polyols are preferably used. Among them, water is particularly preferable.
The particle size of the addition of the active hydrogen compound (B) is not particularly limited, but the average particle size of the active hydrogen compound (B) is preferably 500 μm or less and 100 μm or less upon contact with (A). Is more preferable,
Most preferably, it is 50 μm or less.

[Other additives] In the present invention, other additives may be used in combination, if necessary. Other additives include, for example, a curing accelerator (C), a release agent (D), and an emulsion stabilizer. Further, in the present invention, a water repellent, an antioxidant, an ultraviolet absorber, as long as the desired effect is not impaired,
A flame retardant, a stabilizer, a surfactant, a plasticizer, a silane coupling agent, poval, a metal catalyst, a synthetic rubber latex, an acrylic emulsion, or the like may be used in combination. When the lignocellulosic material contains a recovered material such as construction waste, it is preferable to add a formaldehyde catcher agent to at least one of the surface layer and the core layer during production. The method of adding these other additives is not limited, and may be independently added to the lignocellulose-based material. However, it is usually mixed in advance with at least one of the isocyanate compound (A) and the active hydrogen compound (B). Used. In particular, it is preferable to use a mixture with the active hydrogen compound (B).

<Method of Mixing Other Additives> The method of mixing is not particularly limited. However, the mixing may be performed by adding the component (A) or (B) to the nozzle immediately before mixing with the lignocellulose, or mixing the components in advance. I do not care. The mixing method may be a batch type or a continuous type. As a mixing device, for example, a homogenizer, a static mixer or the like can be used.

<Curing accelerator (C)> As the curing accelerator (C) used in the present invention, any substance can be used without any limitation as long as it has a function of increasing the reaction activity of the organic isocyanate compound (A). . Specifically, for example,
Usually, amine catalysts, metal catalysts, nitrogen-containing compounds, and the like known in urethane chemistry can be used. Among them, in order to prevent the board from being scattered or eluted from the board after the board is manufactured, a compound having a function of increasing the reaction activity of the organic isocyanate compound (A) such as an amine initiator is used as an initiator. Ethylene oxide, propylene oxide, an alkylene oxide which is an epoxy compound such as butylene oxide without a catalyst, or a hydroxide of an alkali metal, a polyether polyol produced using a tertiary amine or the like as a catalyst is preferable, and glycol dicarboxylates And a polyether polyester polyol copolymer obtained by copolymerizing a polyester polyol obtained by an esterification reaction of an acid anhydride, an addition reaction of an acid anhydride with a glycol, or an esterification reaction of a polycarboxylic acid with a glycol. The polyether polyester copolymer is a copolymer obtained by a transesterification reaction between a polyester polyol and a polyether polyol in the presence of a transesterification catalyst or by a ring-opening reaction with an acid anhydride. Although the content in these raw materials is not particularly limited, it is usually 0.1 to 12 as a nitrogen atom.
0 wt%, more preferably 1.0 to 10.0 wt%. These catalyst components may be used alone or in combination of two or more.

<Releasing Agent (D)> In the present invention, a releasing agent (D) may be used in combination, if necessary. This release agent is called an internal release agent, and specific examples thereof include a wax-based release agent, a metal soap-based release agent, and a mixture thereof.
Waxes, metal soaps or mixtures thereof can be suitably used. As the wax-based release agent, specifically, for example, candelilla wax, carnauba wax,
Rice wax, wood wax, palm wax, beeswax, lanolin, whale wax, montan wax, ozokerite, ceresin, paraffin wax, microcrystalline wax, petrolatum, Fischer-Tropsch wax, polyethylene wax, denatured wax, hydrogenated wax, and these Waxes such as compounded wax can be exemplified. The metal soap-based release agent is not particularly limited, but a metal salt of a saturated or unsaturated aliphatic carboxylic acid having 8 to 28 carbon atoms can be preferably used. The metal soap release agent may be used alone or in combination of two or more. Monocarboxylic acids forming this metal soap-based release agent include:
Examples include aliphatic carboxylic acids such as octylic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, arachiic 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 produced by combining at least one or more selected from the group consisting of an acid component and a metal component. The above-described metal soaps may be present as a release agent in a mixture of the organic isocyanate compound of the present invention and a lignocellulosic material. Therefore, they may be used in the form of a metal salt or may be used individually, that is, the aliphatic carboxylic acid and the metal compound may be added separately. The above-mentioned waxes and metal soaps, which are release agents, may be used as an emulsified product (water emulsion) by using an emulsifier, if necessary. here,
When the component (D) is not used as a mixture with (A) or (B), the release agent (D) is added to the hot plate so that the adhesive composition or the like does not adhere to the hot plate during hot pressing of the board. It is preferable to apply and press as an external release agent. In addition, an internal release agent and an external release agent may be used in combination. At this time, the release agents may be the same or different.

(Emulsifier) In this case, the emulsifier is not particularly limited as long as it is generally used, and examples thereof include fatty acid soap, rosin acid soap, alkyl sulfonate, alkylbenzene sulfonate and dialkylaryl. Sulfonates, alkyl sulfosuccinates, polyoxyethylene alkyl sulfates, anionic surfactants such as polyoxyethylene alkyl aryl sulfonates,
Surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene sorbitan fatty acid ester, and oxyethylene oxypropylene block copolymer are exemplified.
These surfactants may be used alone or in combination of two or more.

(Emulsion Stabilizer) Further, an emulsion stabilizer may be used if necessary. The emulsion stabilizer in this case is not particularly limited as long as it can release the release agent and these emulsions. Specific examples include natural polymer compounds and synthetic polymer compounds that form protective colloids. For example, gelatin, gum arabic, carboxymethyl cellulose, polyvinyl alcohol, and the like can be used.

<Formaldehyde Catcher> Any formaldehyde catcher may be used as long as it reacts with formaldehyde, but ammonium acid salts and sulfites of alkali metals are preferably used.
Further, compounds having an amino group, such as urea, guanylurea, melamine, and ammonia, are particularly desirable.

[Production Method of Molded Plate] The production method of the molded plate of the present invention requires the particles of the organic isocyanate compound (A) having a predetermined average particle size or less, the active hydrogen compound (B) and lignocellulose. This is a method of hot-press molding after mixing other additives accordingly. The organic isocyanate compound (A) can be applied to any method as long as it can be brought into contact with and mixed with the lignocellulosic material as fine particles having a predetermined average particle diameter or less, but is usually produced as follows. For example, in the case of a particle board manufacturing facility, woody material is finely cut by a chipper, dried by a drier, and separated into fine chips and coarse chips in a classification process. Thereafter, each chip is added to an apparatus for spraying and mixing an adhesive onto a wood chip called a blender, and mixed with the adhesive. Thereafter, in a forming step, the mats stacked in a three-layer structure of a surface layer, a core layer, and a surface layer are prepressed as necessary, and then hot-pressed by a continuous press or a multi-stage press. On the other hand, when used in an MDF manufacturing facility, it is as follows. A piece of wood is supplied to a digester as a lignocellulosic material and softened using steam (STM) to destroy lignin inside. Thereafter, the chips are sent to a refiner, and the chips are disassembled between disks rotating in the same direction or different directions to produce fibers (defibrated). The high-temperature wet fiber obtained by the refiner is supplied to a dryer via a blow line by a carrier gas such as steam. After that, if there is a blender, after passing through the blender, it is supplied to a forming head and formed on a forming belt to form a so-called forming mat. This forming mat is prepressed as required, and then hot pressed by a continuous press or a multi-stage press. The organic isocyanate compound (A), the active hydrogen compound (B) and other additives are added in any one of the steps up to hot pressing (pre-press if there is a pre-press). For example, in the case of a particle board, the inside of a blender after being pulverized into chips, or in the case of a fiber board, any of an outlet of a refiner, a blow line, and a blender.

<Applying Apparatus> In the present invention, any apparatus can be used as long as it can apply the organic isocyanate compound (A) with particles having a predetermined average particle diameter or less. An air spray spray gun and a spray nozzle can be preferably used. Airless spray is preferred because the structure of the spray head is simple. Air spray is industrially advantageous because it is easy to reduce the mist diameter and a low-pressure pump can be used. As the air spray, a method of mixing and atomizing the fluid and the atomized air outside the spray gun and a method of mixing the fluid and the atomized air inside the spray gun can be suitably used. Any number of spray guns and spray nozzles can be installed depending on the flow rate of the lignocellulosic material. Further, a spray having a plurality of discharge ports arranged in parallel like a multi-head gun for paint may be used. As the spray gun or spray nozzle of the present invention, specifically, for example, a product manufactured by Spraying Systems in the United States, a product manufactured by Atmax Co., Ltd. in Japan, a product manufactured by PAL in Italy, and the like are preferable. . In either case,
After the discharged organic isocyanate compound (A) forms fine particles having a predetermined average particle diameter or less, it is contact-mixed with the active hydrogen compound (B) or the lignocellulose-based material.
The organic isocyanate compound (A) having formed fine particles may be in contact with one of the active hydrogen compound (B) and the lignocellulose-based material, and then with the other or simultaneously. It is preferable to contact (B) first. It is preferable to spray (A) and (B) so that the fine particles of the organic isocyanate compound (A) and the fine particles of the active hydrogen compound (B) are sufficiently mixed. As such a method, the discharge ports of the organic isocyanate compound (A) and the active hydrogen compound (B) may be integrated or each may be a single spray. At this time, it is preferable to spray the particles so that the projection surface of the particles onto the lignocellulose-based material (the site where the sprayed fine particles fall on the lignocellulose-based material) overlaps by 50% or more, and more preferably 70% or more. Preferred, 9
It is particularly preferred that it is 0% or more, and it is most preferred that the spraying is performed so that the projection surfaces substantially overlap. (A),
As a method of integrating the discharge ports of (B), for example, a double pipe structure is used, and (A) is discharged from one side and (B) is discharged from the other side. It is preferable that the discharge port of the active hydrogen compound (B) is located outside the discharge port of the organic isocyanate compound (A).
If necessary, a multi-tube structure such as a triple pipe, a quadruple pipe, a five-ply pipe, or the like may be used to alternately discharge (A) and (B).
When the outlets of (A) and (B) are installed independently,
What is necessary is just to arrange | position so that the particle sprayed from each discharge opening may be substantially mixed mutually. For example, the discharge ports may be installed so as to face each other from a position where the two discharge ports are adjacent and adjacent to each other, and it is particularly preferable to install the discharge ports at an angle of 0 to 180 degrees. The ratio ((B) / (A)) of the number of the active hydrogen compound (B) discharge ports to the number of the organic isocyanate compound (A) discharge ports is preferably 1/2 or more. Thereby, the linear velocity of the active hydrogen compound (B) to be discharged can be made faster than the linear velocity of the organic isocyanate compound (A), and the organic isocyanate compound (A) and the active hydrogen compound (B) can be separated. Dispersion and mixing can be performed more efficiently, which is preferable.

<Coating Conditions> The spray pattern can be changed as required. However, when the lignocellulosic material has an intermittent or continuous flow, when the flow direction is 0, the injection Angles of about 10 degrees to about 150 degrees can be suitably used. If necessary, the viscosity of the organic isocyanate compound (A) can be lowered by heating the organic isocyanate compound (A) for the purpose of reducing the average particle size of the organic isocyanate compound (A). At this time, the heating temperature is preferably from 20 to 150 ° C, more preferably from 30 to 100 ° C. A temperature of 20 ° C. or higher is preferable because the mist system is sufficiently reduced, and a temperature of 150 ° C. or lower is preferable because the stability of the organic isocyanate compound (A) is maintained. The pressure at which the organic isocyanate compound (A) and the active hydrogen compound (B) are discharged is usually 0.1 N / mm ² to
It is a 2N / mm ^2, in this case, although subtle changes in flow rate by the viscosity of the components of each is present, in order to mix ejecting finely precise amount more particle size, the discharge pressure in airless spray It is desirable to set it to 5 N / mm ² or more. This is preferable because a predetermined amount can be discharged regardless of the viscosity of the organic isocyanate compound (A).

[Use of Production Apparatus] The present production method uses a lignocellulosic material in which an adhesive composed of an organic isocyanate compound (A) and a curing agent component composed of an active hydrogen compound (B) are used. It is suitable for a method of dispersing and forming a non-formaldehyde lignocellulose molded plate. It is useful as an adhesive application method that prevents clogging of pipes and spray nozzles.

[0020]

Next, the present invention will be described in more detail with reference to examples, but these examples do not limit the present invention in any way. Table 1 summarizes the evaluation results of the examples and comparative examples. In the examples, all parts and ratios are by weight unless otherwise specified. The common manufacturing conditions of the boards in the performance comparison are described below. [Manufacturing conditions (common items)] ○ Raw material: dust chip or wood fiber (water content: 4.0%, hereinafter simply referred to as chip or fiber) ○ Adhesive and sprayed amount ○ Adhesive used: polymethylene polyphenyl polyisocyanate Nart (Polymeric MDI) ○ Spraying amount: 8% (absolute dry wood fiber), 6%
(Vs. dry chips) ○ Hardening accelerator: 1% (vs. dry lignocellulose material) ○ Board composition: single layer, 3 layers ○ Board thickness (excluding polished part): 15mm ○ Matt water content: 16% ○ heat Pressing temperature: 180 ° C. ○ Pressing pressure: Maximum pressure 35 kg / cm ² ○ Pressing time: 2 minutes 30 seconds ○ Set density: 700 kg / m ³

[Evaluation Test Method] Normal bending strength (hereinafter referred to as “normal bending”) “Particle board JIS-A-5”
908, fiberboard Width 50 mm, length 275 mm (span 225
mm), the test piece was cut and subjected to a bending strength test. The results were expressed as flexural strength. 2. Flexural strength when wet (hereinafter referred to as "wet A") The test piece was cut in the same manner as described above. Next, the test piece was immersed in hot water of 100 ± 3 ° C. for 2 hours, further immersed in normal temperature water for 1 hour, and then subjected to a bending strength test while being wet. The results are shown in the table as the flexural strength when wet (wet A). 3. Peel strength (hereinafter referred to as "peel") A test piece was cut into a 50 mm square from the molded sample. Next, JIS (JIS-A-5905 and JIS-A-590)
8) was performed. The results are shown in the table as peel strength (peel). 4. Deposition test After the adhesive was mixed, the mixture was allowed to stand at room temperature for 1 hour, and then subjected to ordinary forming and hot-pressing to measure the normal bending strength. The results are shown in the table as residual ratio (%). 5. Cycle test Applying the adhesive to the lignocellulosic material for 4 hours, then stopping the application of the adhesive for 1 hour unless otherwise specified, then applying the adhesive for another 4 hours. This cycle was repeated up to 10 times, and a problem arising in the process was mentioned. 6. Measurement of Particle Size Measurement was performed by a dynamic light scattering measurement device (DLS) using laser light. Phototubes were installed at two locations, laser light was passed between them, and isocyanate was sprayed through each of them, and the particle size was measured by each gun. 7. Comprehensive judgment Judgment was made comprehensively because the state of application of the adhesive greatly affected the physical properties of the molded board of the board. The evaluation symbols indicating the determination results are as follows. ：: A state in which a board with good physical properties can be manufactured without any problem △: A state in which the physical properties are good but there is a problem in the manufacture of the board ▽: A state in which there is no problem in the manufacture of the board but the physical properties are poor ×: The physical properties of the board are low and there is a problem in the manufacture State with

Example 1 Polymeric MDI (manufactured by Mitsui Chemicals, Inc., product name: Cosmonate M-200) and water as an active hydrogen compound were sprayed at an air pressure of 0.2 N / mm 2 with a spray gun manufactured by Spraying Systems. Each of them was sprayed independently at a spray angle of 0 degree (parallel) to the chips in the blender. The obtained chip is used as a release agent IMR manufactured by Mitsui Chemicals, Inc.
After forming on a steel coal plate coated with -100, after hot pressing under the above-mentioned press conditions, the state on the steel coal plate was observed, but no particular adhesion was observed. The molded plate after the hot pressing was used for measuring physical properties and evaluated according to the evaluation items described above. As the physical properties, favorable results were obtained in all of the normal bending test, the wet A test, and the core peeling test. In addition, after similarly molding using a chip one hour after the application of the adhesive,
When the physical properties were measured, the residual rate of the physical properties was 93% and 1
It was found that the physical properties did not significantly decrease even after the time deposition. In addition, as a result of the cycle test, no problem occurred in the spray application of the adhesive even after the completion of 10 cycles.

(Example 2) In the method of Example 1, AK-001 (release agent manufactured by Mitsui Chemicals, Inc.) was used as a curing accelerator in an amount of 8% of MDI, and IMR-100 was used as an internal release agent. 1% of a chip (release agent manufactured by Mitsui Chemicals, Inc.) was added to water, which is an active hydrogen compound, respectively, and together with Polymeric MDI (manufactured by Mitsui Chemicals, product name Cosmonate M-200), the central part was added. use and spraying the chips in the blender in air pressure 0.2 N / mm ² at spraying Systems Co. spray gun having a discharge opening on its circumference, the steel caul plate is not performed to a surface treatment as the call Release In the same manner as above, an adhesive was spray-coated on the chip, hot-pressed, and evaluated similarly. As a result of the evaluation, no deposits were observed on the steel coulter. Also,
Good results were obtained in both the physical property test and the deposition test. In addition, as a result of the cycle test, no problem occurred in the spray application of the adhesive even after the completion of 10 cycles.

Example 3 In the same manner as in Example 1, except that the lignocellulosic material was changed to wood fiber and the high pressure coating was performed at a discharge pressure of 7 N / mm ² according to the method of Example 1. A board was manufactured and evaluated. As a result of the evaluation,
Good results were obtained in all of the board properties, the deposition test, and the cycle test.

Example 4 In the same manner as in Example 1 except that the lignocellulosic material was changed to wood fiber and the high pressure coating was performed at a discharge pressure of 7 N / mm ² according to the method of Example 2. A board was manufactured and evaluated. As a result of the evaluation, favorable results were obtained in all of the board physical properties, the deposition test, and the cycle test.

Example 5 A melamine-based resin (manufactured by Mitsui Chemicals, Inc.) was used as the surface resin, and 12% was added to the surface chip.
Cosmonate M-200 (manufactured by Mitsui Chemicals, Inc.) as a polymeric MDI and water as an active hydrogen compound are applied to the core layer chip in a blender with a PAL two-hole spray gun at an air pressure of 0.2 N / mm ² . Sprayed on the chips. After the obtained chip was formed on a steel coal plate, after hot pressing under the above-mentioned press conditions, the state on the steel coal plate was observed, but no particular adhesion was observed. The molded plate after the hot pressing was used for measuring physical properties and evaluated according to the evaluation items described above. As the physical properties, favorable results were obtained in all of the normal bending test, the wet A test, and the core peeling test. In addition, physical properties were measured using a chip one hour after the application of the adhesive, and the physical properties were measured. As a result, the residual ratio of the physical properties was 93%, and it was found that the physical properties did not significantly decrease even after one hour of deposition. In addition, as a result of the cycle test, no problem occurred in the spray application of the adhesive even after the completion of 10 cycles.

(Comparative Example) In the same manner as in Example 5, except that MDI and water were separately sprayed using a spray gun (one-liquid discharge type manufactured by PAL) which is usually used for spraying an amino resin. A board was formed in the same manner. As a result of the evaluation,
The MDI sprayed particle size was large, and the physical properties of the board were low. Further, after the same molding was performed using a chip one hour after the application of the adhesive and the physical properties were measured, the residual ratio of the physical properties was 80%. As a result of a cycle test, the adhesive was sprayed after 10 cycles. No problems occurred in the application.

[0028]

[Table 1]

[0029]

According to the method of the present invention, an organic isocyanate compound and an active hydrogen compound such as water, which have been considered difficult so far, are separately discharged and dispersed, and mixed externally to obtain various compounds as described below. It has a great effect. That is, since it is not necessary to dilute the organic isocyanate compound with water, it is not necessary to perform modification for diluting the compound in water, and it is economical because no extra cost is required. Because there is no emulsion in the mixer, in the piping, and in the spray head,
Since the precipitation of a reaction product such as an organic isocyanate compound and water does not occur, the adhesive component can be stably supplied in a predetermined amount, and the physical properties are stabilized, and instability such as deterioration of physical properties occurs. Eliminating, furthermore, line troubles such as line blockage, that is, stoppage of the production line, startup, and line blockage due to long-term operation, troubles such as a decrease in flow rate are less likely to occur, and an active hydrogen compound, a curing accelerator,
Spraying additives such as an internal release agent separately from the organic isocyanate compound has increased the degree of freedom of the additive system.In addition, a system that can freely control the curing speed, release properties, etc. Because it can be built,
An inexpensive lignocellulose molded plate of good quality can be stably manufactured with high productivity.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naohiro Murata 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture Inside Mitsui Chemicals Co., Ltd. (72) Inventor Takeshi Ito 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture 72) Inventor Kazumasa Shigeta 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture Inside Mitsui Chemicals Co., Ltd. BD24 CA07 CA25 CA47 DA21 4F071 AA53 AA71 AA73 AC09 AC12 AE03 AE18 AE22 AH03 BA03 BA04 BB03 BC01 BC03

Claims (6)

[Claims] 1. A method for producing a lignocellulose molded plate using an organic isocyanate compound (A) and an active hydrogen compound (B), comprising the steps of:
Is adjusted to an average particle diameter of 200 μm or less and mixed with lignocellulose. 2. The method according to claim 1, wherein the discharge pressure of the organic isocyanate compound (A) is 5 N / mm ² or more. 3. The method for producing a lignocellulose molded plate according to claim 1, wherein the average particle diameter of the active hydrogen compound (B) at the time of discharge is 500 μm or less. 4. An organic isocyanate compound (A) and an active hydrogen compound (B) are sprayed by a double tube type sprayer, and the organic isocyanate compound (A) is sprayed from a central portion of a discharge port and an active hydrogen compound (A). 4. The method for producing a lignocellulose molded plate according to claim 1, wherein B) is discharged from the circumference. 5. The method for producing a lignocellulose molded plate according to claim 1, wherein a curing accelerator (C) is further added to the active hydrogen compound (B). 6. The method for producing a lignocellulose molded plate according to claim 5, wherein a release agent (D) is further used in combination with the active hydrogen compound (B).