JP2021098358A - Production method of wood panel - Google Patents

Abstract

To provide a production method of a nontoxic wood panel with a high yield ratio and high quality, excellent in physical characteristic, and friendly to the environment.SOLUTION: A production method includes a step of producing wood panels by using fiber, preferably vegetable fiber and reaction systems including: isocyanate components A), which include A1), 7.0 wt.% to 20 wt.% of 2, 2'-diphenylmethan diisocyanate based on the total weight of components A), and A2), 26 wt.% to 48 wt.% of polycyclic polymeric isocyanate based on the total weight of components A), having viscosity of 50 mPa s to 160 mPa s; and at least one of polyol components B).SELECTED DRAWING: None

Description

The present invention relates to a method for producing a wood panel, a wood panel produced by the method, and its use.

For many years, the adhesives commonly used in the manufacture of wood panels such as adhesive boards, strand boards, fiberboards, plywood, and oriented strand board (OSB) have been urea formaldehyde, phenol formaldehyde. , Or a resin based on melamine formaldehyde. These formaldehyde-based resins are relatively low cost and can be easily ground and processed on various types of production lines. However, formaldehyde-based resins have the disadvantage that they release formaldehyde over time and can be harmful to health when used in poorly ventilated closed spaces. Attempts have been made in the industry to address the shortcomings by using isocyanates as adhesives and replacing urea-formaldehyde adhesives in wood panels with isocyanate adhesives in various ways. However, isocyanates, especially those isomers with high activity, are expensive, highly viscous, low in production efficiency and unacceptable for market dominance. Therefore, it is desired in the industry to reduce costs while ensuring sufficient system activity, improve the efficiency of wood panel production, and produce excellent aldehyde-free wood panels.

Patent Document 1 provides an MDI / polypropylene polyether prepolymer composition essentially consisting of at least 80% by weight of complete prepolymer and less than 2% by weight of free MDI monomers suitable for use in polyurethane adhesive compositions. Disclosed, the composition optionally also comprises an isocyanate group curing agent. Also included are polyol compositions containing propylene oxide-based polyether polyols.

Patent Document 2 describes that A) a combination of wood particles and a binder composition of 1% by weight to 25% by weight based on the total weight of the wood composite material, and the binder composition is (1) about 2). A polymethylene poly (phenylisocyanate) having a functional value of 1 to about 3.5, an NCO group content of about 25 to 33%, and a monomer content of about 30% by weight to about 90% by weight. The monomer content is based on the total weight of the polyisocyanate, with a maximum of about 5% by weight of 2,2'-isomers and a maximum of about 1% by weight to a maximum of about 20% by weight of 2,4'-isomers. It is essentially composed of polymethylene poly (phenylisocyanate) containing about 25% by weight to about 65% by weight of 4,4'-isomerate and (2) solid resole resin, and the components A) and (2). A wood composite material comprising molding or compressing a mixture formed of B) A) to form a wood composite material, wherein the weight ratio of the above components A) and (1) is 1: 3 to 10: 1. Discloses the manufacturing process of.

Patent Document 3 has a total diisocyanate content of at least 99% by weight based on the total weight of the diisocyanate composition, and is 5% by weight to 15% by weight based on the total weight of the diisocyanate contained in the diisocyanate composition. Disclosed is a diisocyanate composition comprising 2'-diphenylmethane diisocyanate, 50% to 70% by weight 2,4'-diphenylmethane diisocyanate, and 25% to 40% by weight 4,4'-diphenylmethane diisocyanate. There is.

Chinese Patent Application Publication No. 1380346 Chinese Patent Application Publication No. 133690 Chinese Patent Application Publication No. 109535383

Despite the above disclosure, there is still an urgent need in the market for methods of producing environmentally friendly non-toxic wood panels with higher yields, better quality and higher physical properties.

In the first aspect of the present invention, fiber, preferably plant fiber, and the following components:
Isocyanate component A)
A1) Based on the total weight of component A), 7.0% by weight to 20% by weight, preferably 7.6% by weight to 20% by weight, more preferably 8.0% by weight to 20% by weight, particularly preferably 8. .2% to 18% by weight of 2,2'-diphenylmethane diisocyanate,
A2) Based on the total weight of component A), 26% by weight to 48% by weight of polycyclic polymer isocyanate and
Including
Isocyanate component A) having a viscosity of 50 mPa · s to 160 mPa · s, preferably 60 mPa · s to 125 mPa · s, and
Optionally,
At least one polyol component B) and
Provided is a method of making a wood panel, comprising the step of making the wood panel by using a reaction system comprising.

The isocyanate component A) preferably has a content of 1% by weight to 10% by weight, preferably 2.5% by weight to 7% by weight, based on the total weight of the fiber oven-dried.

The fibers preferably have a moisture content of 1% to 25% by weight, preferably 2% to 16% by weight, more preferably 3% to 15% by weight, based on the total oven-dried weight of the fibers.

The reaction system is urea formaldehyde resin, phenol resin, polyvinyl acetate resin, polyvinyl acetate, ethylene-modified polyvinyl acetate, polyvinyl alcohol, epoxy resin, silicone resin, unsaturated polyester, styrene resin adhesive, tannin resin adhesive, starch adhesion. It is preferable to further contain one or more of the agent, the lignin adhesive, and the protein adhesive.

The method preferably further comprises the step of introducing the reaction system into the mold by a pump with a pressure of 1.2 bar to 16 bar, preferably 1.4 bar to 12 bar.

The reaction system is preferably introduced at a rate of 1.2 kg / min to 25 kg / min, preferably 1.5 kg / min to 20 kg / min (measured by mass flow rate measurement).

The yield of the wood panel produced by the above method is ^{preferably 7 m 3} / h or more, preferably 10 m ³ / h or more, and more preferably 12 m ³ / h or more (measured by the volume method).

The fiber is preferably selected from one or more of the group consisting of sawn wood, straw, bamboo stalks, shavings, cotton stalks, bagasse and reeds.

Component A) is 4,4'-diphenylmethane diisocyanate in an amount of 41% by weight or less, preferably 20% by weight to 41% by weight, particularly preferably 28% by weight to 37% by weight, based on the total weight of the component A). It is preferable to further contain.

The component A) is 2,4'-diphenylmethane diisocyanate in an amount of 30% by weight or less, preferably 5% by weight to 25% by weight, more preferably 10% by weight to 25% by weight based on the total weight of the component A). It is preferable to further contain.

The reaction system preferably does not contain a catalyst.

The method may further include mixing the fibers with a reaction system and reacting and curing at room temperature and / or preferably at a high temperature of 90 ° C. to 250 ° C., more preferably 200 ° C. to 250 ° C. to obtain a wood panel. preferable.

It is well known to those skilled in the art that isocyanates as adhesives or other raw materials usually contain isomers of 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate and 2,2'-diphenylmethane diisocyanate. ing. In both laboratory and industrial production, the content of 4,4'-diphenylmethane diisocyanate in isocyanates is usually very high, and in some cases even over 50% by weight, thereby making it reactive. I have secured it. Of all the isomers, 2,2'-diphenylmethane diisocyanate has the lowest activity. For example, in Chinese Patent Application Publication No. 1330668, International Publication No. 2007/087987 states that "in the case of monomeric diphenylmethane diisocyanate, 4,4'-and 2,4'-isomers are contained due to synthesis. It is predominant. The 2,2'-isomers are also less likely to occur and are largely of no technical value. " This has the disadvantage that pure 2,2'-diphenylmethane diisocyanates cannot be used in the industry and isocyanates containing 2,2'-diphenylmethane diisocyanates are often very slow to react, thereby causing a failure. Partly due to the finding that it will be complete.

However, in the synthesis of isocyanates, it is inevitable that various isomers will be formed. As a result, 2,2'-diphenylmethane diisocyanate is often incinerated as waste, resulting in large amounts of waste and environmental pollution. On the other hand, 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate are expensive due to their high activity.

Repeated experiments, surprisingly, excellent aldehyde-free wood panels by using a reaction system containing an appropriate amount of 2,2'-diphenylmethane diisocyanate and an isocyanate having a certain range of viscosities. It was found that not only can the yield and production efficiency be improved. In addition, stable reaction rates can be ensured without catalysts, process optimization and resource conservation can be achieved. In addition, costs are saved by reducing the amount of expensive 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate and / or high molecular weight isocyanate commonly used in large quantities in the art. And make it more economical and environmentally friendly.

Isocyanate adhesives used in the manufacture of wood panels in the industry typically have viscosities of 170 mPa · s to 230 mPa · s (25 ° C.), with some specially modified isocyanates being even more viscous. Is. At the same temperature, the viscosity and resistance to motion are determined by the composition of the isocyanate. In the process of manufacturing wood panels, a pump is required to introduce the adhesive, and the pump system usually has certain normal safe working pressures. If you want to increase the manufacturing efficiency of wood composite panels, the amount of isocyanate used will increase, so you need to increase the amount of isocyanate transported by the discharge pump, that is, if the setting does not change the isocyanate application rate, increase the operating parameters of the pump. There is. As the amount of isocyanate carried increases, the load on the pump system increases and the working pressure rises, and above the safe working pressure, the equipment is vulnerable to damage.

The use of the methods according to the invention, in particular the use of certain isocyanates in the reaction system, can reduce the load on the pump system, so that even at high speeds and high powers, the pump system is normal. It operates within a safe working pressure range, which can safely and effectively improve the manufacturing efficiency of wood composite panels.

In addition, the isocyanate adhesives used in the art often adhere to the inner wall of the mixer due to their high viscosity, which makes cleaning difficult and affects the function and life of the device. The isocyanate component according to the present invention significantly reduces the wall hanging phenomenon, thus making the related equipment easier to clean, making it better and more durable.

In another aspect of the invention, there is provided a wood panel produced by the aforementioned method of producing a wood panel according to the invention.

Wood ^{panel, 480kg / m 3 ~1400kg / m} 3, preferably preferably has a density of ^{500kg / m 3 ~860kg / m 3} .

In yet another aspect of the invention, a wood panel product comprising the wood panel according to the invention is provided.

The wood panel product is preferably selected from the group consisting of wardrobes, office desks or chairs, bedboards, sofa chairs, cabinets, bathroom cabinets, ball thrusters, and table tennis tables.

Here, various aspects of the present invention will be described in detail.

Component of Reaction System for Producing Wood Panels Polyisocyanate Component The reaction system used in the method for producing wood panels according to the present invention is any organic including aromatic, aliphatic and alicyclic polyisocyanates, and combinations thereof. May include polyisocyanates. The polyisocyanate can be represented by the formula R (NCO) n, where R is an aliphatic hydrocarbon group having 2 to 18 carbon atoms and an aromatic having 6 to 15 carbon atoms. It represents a hydrocarbon group and an aromatic aliphatic hydrocarbon group having 8 to 15 carbon atoms, and n = 2-4.

Useful polyisocyanates include, but are not limited to, vinyl diisocyanates, tetramethylene 1,4-diisocyanates, hexamethylene diisocyanates (HDI), dodecyl 1,2-diisocyanates, cyclobutane-1,3-diisocyanates, cyclohexane-. 1,3-Diisocyanate, cyclohexane-1,4-diisocyanate, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane, hexahydrotoluene-2,4-diisocyanate, hexahydrophenyl-1,3 − Diisocyanate, hexahydrophenyl-1,4-diisocyanate, perhydro-diphenylmethane 2,4-diisocyanate, perhydro-diphenylmethane 4,4-diisocyanate, phenylene 1,3-diisocyanate, phenylene 1,4-diisocyanate, stillben 1,4- Diisocyanate, 3,3-dimethyl 4,4-diphenyl diisocyanate, toluene-2,4-diisocyanate (TDI), toluene-2,6-diisocyanate (TDI), diphenylmethane-2,4'-diisocyanate (MDI), diphenylmethane- A mixture of 2,2'-diisocyanate (MDI), diphenylmethane-4,4'-diisocyanate (MDI), diphenylmethane diisocyanate and / or diphenylmethane diisocyanate homologue with more rings, polyphenylmethane polyisocyanate (polymeric MDI), Included are naphthylene-1,5-diisocyanate (NDI), their isomers, and any mixture thereof with their isomers.

Useful polyisocyanates further include, but are not limited to, carbodiimides, allophanates, or isocyanate-modified isocyanates, preferably, but not limited to, carbodiimides, carbodiimide-modified diphenylmethane diisocyanates, their isomers, and their isomers. The mixture with the body is mentioned.

As used in the present invention, polyisocyanates include isocyanate dimers, trimers, tetramers, or combinations thereof.

In a preferred embodiment of the invention, the isocyanate components are:
A1) Based on the total weight of component A), 7.0% by weight to 20% by weight, preferably 7.6% by weight to 20% by weight, more preferably 8.0% by weight to 20% by weight, particularly preferably 8. .2% to 18% by weight of 2,2'-diphenylmethane diisocyanate,
A2) Based on the total weight of component A), 26% by weight to 48% by weight of polycyclic polymer isocyanate and
Including
Here, the isocyanate component A) has a viscosity of 50 mPa · s to 160 mPa · s, preferably 60 mPa · s to 125 mPa · s.

The isocyanate component A) according to the present invention has a viscosity of 50 mPa · s to 160 mPa · s (25 ° C.), preferably 60 mPa · s to 125 mPa · s (25 ° C.).

Preferably, the isocyanate component A) has a content of 1% by weight to 10% by weight, preferably 2.5% by weight to 7% by weight, based on the total weight of the fiber oven-dried.

Component A) is 4,4'-diphenylmethane in an amount of 41% by weight or less, preferably 20% by weight to 41% by weight, particularly preferably 28% by weight to 37% by weight, based on the total weight of the component A). It is preferable to further contain diisocyanate.

The component A) is 2,4'-diphenylmethane in an amount of 30% by weight or less, preferably 5% by weight to 25% by weight, more preferably 10% by weight to 25% by weight based on the total weight of the component A). It is preferable to further contain diisocyanate.

The polycyclic polymer isocyanate according to the present invention refers to a tricyclic or higher isocyanate polymer and does not contain a diisocyanate polymer. The polycyclic polymer isocyanate used in the present invention has a viscosity higher than that of the polymer isocyanate generally used in the art, but unexpectedly, it is combined with other isocyanate components according to the present invention. It was found that a reaction system with a lower overall viscosity can be obtained. Further, as described above, the method for producing a wood panel according to the present invention can significantly improve the yield of the wood panel.

Polyol Component The polyol according to the invention is preferably a plurality of polyether polyols and / or a mixture thereof, wherein at least one polyether polyol is a polyol starting with glycerol. Polyether polyols have a functional value of 2-4 and a hydroxyl value of 20-600, preferably 50-500, particularly preferably 300-400.

Polyether polyols can be prepared by known processes. Usually, the polyether polyol is ethylene oxide or propylene oxide, ethylene glycol, 1,2-propanediol, 1,3-propanediol, diethylene glycol, glycerol, trimethylolpropane, pentaerythritol, triethanolamine, toluenediamine, sorbitol and Prepared by mixing with sucrose and using glycerol or propylene glycol as an initiator.

Further, the polyether polyol is also in the presence of a catalyst with at least one alkylene oxide having an alkylene having 2-4 carbon atoms and 2-8, preferably but not limited to 3. It can be prepared by reacting with a compound containing 8 to 8 active hydrogen atoms or another reactive compound.

Examples of catalysts are alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, or alkali metal alkoxides such as sodium methoxide, sodium ethoxide or potassium ethoxide or potassium isopropoxide.

Useful alkylene oxides include, but are not limited to, tetrahydrofuran, ethylene oxide, 1,2-propylene oxide, 1,2-butylene oxide, 2,3-butylene oxide, styrene oxide, and any mixture thereof. Can be mentioned.

Useful compounds containing active hydrogen atoms include polyhydroxy compounds, preferably, but not limited to, water, ethylene glycol, 1,2-propanediol, 1,3-propanediol, diethylene glycol, trimethylol. Propane, any mixture thereof, more preferably polyols, in particular glycerol, trimethylolpropane, pentaerythritol, sorbitol and sucrose and other ternary or higher polyhydric alcohols. Useful compounds containing active hydrogen atoms include, but are not limited to, organic dicarboxylic acids such as succinic acid, adipic acid, phthalic acid and terephthalic acid, or ethylenediamine, diethylenetriamine, triethylenetetramine, propylenediamine, butane. Aromatic or aliphatic substituted diamines such as diamines, hexamethylenediamines and toluenediamines are also included.

（式中、Ｒ_１及びＲ_２は、Ｈ、直鎖状及び分枝状Ｃ_１〜Ｃ_６アルキル基、並びにフェニル基及び置換フェニル基からなる群より独立して選択される）を有するものを指す。 As used in the present invention, the term "alkylene oxide compound" generally refers to the following general formula (I):

(In the formula, R ₁ and R ₂ are independently selected from the group consisting of H, linear and branched C _{1 to} C ₆ alkyl groups, and phenyl group and substituted phenyl group). Point to.

R ₁ and R ₂ are preferably selected independently from the group consisting of H, methyl, ethyl, propyl and phenyl.

Methods of making "alkylene oxide compounds" are known to those of skill in the art. For example, an alkylene oxide compound can be obtained by an oxidation reaction of an olefin compound.

Examples of alkylene oxide compounds useful in the present invention are, but are not limited to, ethylene oxide, 1,2-propylene oxide, 1,2-butylene oxide, 2,3-butylene oxide, styrene oxide or mixtures thereof. A mixture of ethylene oxide and 1,2-propylene oxide is particularly preferable.

As used in the present invention, the term "alkylene oxide compound" also includes oxacycloalkanes, examples of which include, but are not limited to, tetrahydrofuran and oxetane.

As used in the present invention, the term "amine" refers to a compound containing a primary amino group, a secondary amino group, a tertiary amino group, or a combination thereof. Examples of amine compounds useful in the present invention are, but are not limited to, triethanolamine, ethylenediamine, toluenediamine, diethylenetriamine, triethylenetetramine, and derivatives thereof, preferably ethylenediamine, toluenediamine, particularly preferably. Toluenediamine can be mentioned.

Catalysts Any useful catalyst in the present invention includes, but is not limited to, amine catalysts and alkali metal catalysts. Suitable amine catalysts are triethylamine, tributylamine, triethylenediamine, N-ethylmorpholine, N, N, N', N'-tetramethyl-ethylenediamine, pentamethyldiethylene-triamine, N, N-methylaniline, N, N. -Can be one or more of dimethylaniline. The reaction system according to the present invention preferably does not contain a catalyst.

From repeated experiments, surprisingly, when using a reaction system containing an appropriate amount of 2,2'-diphenylmethane diisocyanate and an isocyanate having a certain range of viscosities, a catalyst is needed to improve the activity. Rather, it has been found that it is also possible to produce excellent aldehyde-free wood panels without the use of catalysts, saving costs and optimizing the process. Furthermore, it is possible to increase the yield and production efficiency of the wood panel.

In a preferred embodiment of the invention, the fibers are 1% to 25% by weight, preferably 2% to 16% by weight, more preferably 3% to 15% by weight, based on the total oven-dried weight of the fibers. Has a moisture content.

The reaction system is urea formaldehyde resin, phenol resin, polyvinyl acetate resin, polyvinyl acetate, ethylene-modified polyvinyl acetate, polyvinyl alcohol, epoxy resin, silicone resin, unsaturated polyester, styrene resin adhesive, tannin resin adhesive, starch adhesion. It is preferable that one or more of the agent, the lignin adhesive, and the protein adhesive are further contained.

The method preferably further comprises the step of introducing the reaction system into the mold by a pump with a pressure of 1.2 bar to 16 bar, preferably 1.4 bar to 12 bar.

The reaction system is preferably introduced at a rate of 1.2 kg / min to 25 kg / min, preferably 1.5 kg / min to 20 kg / min (measured by mass flow rate measurement).

The yield of the wood panel produced by the above method is ^{preferably 7 m 3} / h or more, preferably 10 m ³ / h or more, and more preferably 12 m ³ / h or more (measured by the volume method).

The fiber is preferably selected from one or more of the group consisting of sawn wood, straw, bamboo stalks, shavings, cotton stalks, bagasse and reeds.

The reaction system preferably does not contain a catalyst.

The method may further include mixing the fibers with a reaction system and reacting and curing at room temperature and / or preferably at a high temperature of 90 ° C. to 250 ° C., more preferably 200 ° C. to 250 ° C. to obtain a wood panel. preferable.

Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. If the definitions of terms in the context of the present invention contradict the meaning generally understood by those skilled in the art to which the present invention belongs, the definitions set forth herein shall apply.

Unless otherwise specified, all numerical values representing the amounts of compounding ingredients, reaction conditions, etc. used in the context of the present invention and in the claims are understood to be modified by the term "about".

As used herein, the term "and / or" refers to one or all of the elements referred to.

As used herein, the terms "containing," "including, including," and "comprising" are used when only the elements mentioned are present and the elements mentioned. It covers both cases where there are other elements not mentioned in addition to.

All percentages in the context of the present invention refer to weight percentages unless otherwise stated.

Here, the present invention will be described with reference to examples for the purpose of explanation, not limitation.

Description of test project and test method:
Density refers to the calculated density of wood panel samples measured according to GB / T17657-2013.

The yield refers to the unit yield of the wood panel, and is calculated as the cumulative value of ^{the volume (m 3, cubic meter) of the wood panel manufactured per unit time (h, hour).}

Internal bond strength refers to the internal bond strength of wood panels measured according to GB / T17657-2013.

Ingredient description:
Isocyanate 1, based on the total weight of the isocyanate 1, 8.5% by weight of 2,2'-diphenylmethane diisocyanate (2,2'-MDI) and 2,4'-diphenylmethane diisocyanate (2,4'-MDI) 23. Contains 3% by weight, 4,4'-diphenylmethane diisocyanate (4,4'-MDI) 30.2% by weight, and polycyclic high molecular weight isocyanate 37.7% by weight, and has a viscosity of 80 mPa · s (25 ° C.). It was purchased from Covestro Polymers (China) Co., Ltd.

It has an isocyanate 2, Desmodur 1520 A 20, 2,2'-diphenylmethane diisocyanate (2,2'-MDI) content of 0%, and a polycyclic polymer isocyanate content of 54% by weight, and has a viscosity of 205 mPa · s (25). ℃) and purchased from Covestro Polymers (China) Co., Ltd.

Rubber material 1 (having a moisture content of 3.6% by weight), purchased from a local farmer in Hainan.

Rubber material 2 (having a moisture content of 13.4% by weight), purchased from a local farmer in Hainan.

Example 1:
The shavings of rubber material 1 and rubber material 2 are continuously supplied to the mold at a weight ratio of 6: 4, and isocyanate 1 (having an applicable weight of 3% based on the weight of oven-dried wood) is applied at a pressure of 1.65. It was introduced into the mold by a pump from bar to 1.85 bar and speed 1.2 kg / min to 25 kg / min. Type about 7.11 sec / mm heating time of ^(a pressure of ^{0.3N / mm 2 ~4.2N / mm 2} ) was heated to 220 ° C.. A wood panel was obtained after the isocyanate had hardened.

In Example 1, the amount of isocyanate 1 transported was 5.3 kg / min, the working pressure of the pump was 1.69 bar, and the operating parameters were 602 rpm. Therefore, it can be calculated that the yield of the wood panel of Preparation Example 1 was 15.9 m ^{3 / h.}

When the manufactured wood panel was tested, it was found that the density ^{reached 675 kg / m 3} and the internal binding force of the panel was 0.65 MPa.

Comparative Example 1:
The shavings of the rubber material 1 and the rubber material 2 are continuously supplied to the mold at a weight ratio of 6: 4, and the isocyanate 2 (having an applicable weight of 3% by weight based on the weight of the oven-dried wood) is applied under a pressure of 1. It was introduced into the mold by a pump from 65 bar to 1.85 bar and a speed of 1.2 kg / min to 25 kg / min. Type about 7.11 sec / mm heating time of ^(a pressure of ^{0.3N / mm 2 ~4.2N / mm 2} ) was heated to 220 ° C.. A wood panel was obtained after the isocyanate had hardened.

The transport rate of isocyanate 2 in the comparative example was 2.0 kg / min, the working pressure of the pump was 1.84 bar, and the operating parameter was 356 rpm. Therefore, it can be calculated that the yield of the wood panel of the comparative preparation example was 6 m ^{3 / h.}

When the manufactured wood panel was tested, the density ^{reached 680 kg / m 3,} and the yield of the wood composite panel was found to be 0.68 MPa for the internal bonding force of the panel.

Comparing the examples of the present invention with the comparative examples, by using the isocyanate 1 of the present invention instead of the existing isocyanate 2, the yield of the wood panel ^{can reach 15.9 m 3} / h, whereby the yield of the wood panel can be reached 15.9 m 3 / h. It can be seen that the yield and production efficiency have increased significantly. Furthermore, the wood panel produced by the method of Example 1 had a density and internal binding force close to those of the comparative example.

The detailed description of the present invention described above is given for the purposes of the present invention, but the detailed description is exemplary in nature and does not deviate from the gist and scope of the invention and is claimed by the scope of the claims. It is understood that in addition to what is defined, various changes can be made by those skilled in the art.

Claims (16)

Fiber, preferably plant fiber, and the following ingredients:
Isocyanate component A)
A1) Based on the total weight of the component A), 7.0% by weight to 20% by weight, preferably 7.6% by weight to 20% by weight, more preferably 8.0% by weight to 20% by weight, particularly preferably. 8.2% to 18% by weight of 2,2'-diphenylmethane diisocyanate,
A2) Based on the total weight of the component A), 26% by weight to 48% by weight of the polycyclic polymer isocyanate and
Including
Isocyanate component A) having a viscosity of 50 mPa · s to 160 mPa · s (25 ° C.), preferably 60 mPa · s to 125 mPa · s (25 ° C.).
Optionally,
At least one polyol component B) and
A method of manufacturing a wood panel, comprising the step of manufacturing the wood panel by using a reaction system comprising. The first aspect of the present invention, wherein the isocyanate has a content of 1% by weight to 10% by weight, preferably 2.5% by weight to 7% by weight based on the total weight of the fibers dried in an oven. Method. The fibers are characterized by having a moisture content of 1% to 25% by weight, preferably 2% to 16% by weight, more preferably 3% to 15% by weight, based on the total oven-dried weight of the fibers. The method according to claim 1 or 2. The reaction system is urea formaldehyde resin, phenol resin, polyacrylic resin, polyvinyl acetate, ethylene-modified polyvinyl acetate, polyvinyl alcohol, epoxy resin, silicone resin, unsaturated polyester, styrene resin adhesive, tannin resin adhesive, starch. The method according to any one of claims 1 to 3, further comprising one or more of an adhesive, a lignin adhesive, and a protein adhesive. Any one of claims 1 to 4, further comprising the step of introducing the reaction system into the mold by a pump having a pressure of 1.2 bar to 16 bar, preferably 1.4 bar to 12 bar. The method described in. 5. The reaction system according to claim 5, wherein the reaction system is introduced at a rate of 1.2 kg / min to 25 kg / min, preferably 1.5 kg / min to 20 kg / min (measured by mass flow rate measurement). the method of. The claim is characterized in that the yield of the wood panel produced by the above method is 7 m ³ / h or more, preferably 10 m ³ / h or more, more preferably 12 m ³ / h or more (measured by the volume method). The method according to any one of 1 to 6. Any of claims 1-7, wherein the fiber is selected from one or more of the group consisting of sawn wood, straw, bamboo stalks, shavings, cotton stalks, bagasse and reeds. The method described in paragraph 1. The amount of 4,4'-diphenylmethane is 41% by weight or less, preferably 20% by weight to 41% by weight, particularly preferably 28% by weight to 37% by weight, based on the total weight of the component A). The method according to any one of claims 1 to 8, further comprising diisocyanate. The component A) is 2,4'-diphenylmethane in an amount of 30% by weight or less, preferably 5% by weight to 25% by weight, more preferably 10% by weight to 25% by weight based on the total weight of the component A). The method according to any one of claims 1 to 9, further comprising diisocyanate. The method according to any one of claims 1 to 10, wherein the reaction system does not contain a catalyst. It further comprises a step of mixing the fibers with the reaction system and reacting and curing at room temperature and / or preferably at a high temperature of 90 ° C. to 250 ° C., more preferably 200 ° C. to 250 ° C. to obtain the wood panel. The method according to any one of claims 1 to 11. A wood panel produced by the method for producing a wood panel according to any one of claims 1 to 12. The wood ^{panel, 480kg / m 3 ~1400kg / m} 3, preferably characterized by having a density of ^{500kg / m 3 ~860kg / m 3} ( measured according to GB / T17657-2013), according to claim 13 Wood panel. A wood panel product comprising the wood panel according to claim 13 or 14. 15. The wooden panel product according to claim 15, wherein the wood panel product is selected from the group consisting of a wardrobe, an office desk or chair, a bedboard, a sofa chair, a cabinet, a bathroom cabinet, a ball thruster, and a table tennis table. Wood panel products.