JP2007144680A - Penetrable coating for reinforcing woody material and reinforced woody material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means which efficiently impregnates a woody material with a resin component for coating and can reinforce the woody material by simple operation and/or facilities in a state that a good working environment is kept. <P>SOLUTION: This penetrable coating for reinforcing the woody material contains polymethylene/polyphenyl polyisocyanate, of which the content of a binuclear component is 50-90% and the viscosity at 25°C is 80 mPa s or below and which is liquid at the normal temperature. The reinforced woody material obtained by coating the woody material with the penetrable coating for reinforcing the woody material is also disclosed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an impregnating paint for reinforcing a wooden material and a reinforced wooden material, and more particularly to an impregnating paint for reinforcing a wooden material suitable for reinforcing a wooden material and the like, and a reinforced wooden material.

  The wood material has advantages such as flexibility and ease of processing. Therefore, the wooden material is used as, for example, a building material. However, the wooden material has a drawback that physical strength such as impact resistance and abrasion resistance is not sufficient depending on the application.

  Accordingly, various attempts have been made to reinforce the wooden material. For example, Patent Document 1 discloses that a wood veneer is produced by impregnating a decorative veneer with an isocyanate compound and then reacting the isocyanate compound with water to form a polymer and solidifying the wood veneer. Attempts to reinforce are disclosed.

  The isocyanate compound as it is cannot be impregnated into a wood material, and even if it can be impregnated, it is difficult to dry. Furthermore, when the isocyanate compound remains on the surface of the wood material, there is a disadvantage that the wood materials are bonded to each other when the wood materials are stacked, and thus the production is not suitable for line production. Therefore, when the wood material is reinforced with the isocyanate compound, the isocyanate compound is often used by being dissolved in an organic solvent such as acetone.

However, when the organic solvent is used, there is a drawback that it is difficult to maintain a good working environment.
JP-A-3-275304

  The present invention has been made in view of the above-described conventional drawbacks. It exhibits high reinforcement to a wood material, and allows a simple operation and / or operation of the wood material while maintaining a good working environment. Alternatively, it is an object to provide an impregnating paint for reinforcing a wood material, which can achieve at least one of being capable of being reinforced at a facility. Another object of the present invention is to provide a reinforced wooden material that can achieve at least one of exhibiting excellent physical strength, simple operation and / or being able to be manufactured in a facility. Other problems of the present invention are also apparent from the description of the present specification.

  The present invention has been made in view of the above problems. In one aspect, the binuclear content is 50 to 90%, the viscosity at 25 ° C. is 80 mPa · s or less, and is liquid at room temperature. The present invention relates to an impregnating paint for reinforcing a wood material, characterized by containing a certain polymethylene polyphenyl polyisocyanate. Furthermore, the present invention, in another aspect, relates to a reinforced wood material, wherein the wood material reinforcing impregnating paint is coated on a wood material.

  According to the impregnating paint for reinforcing a wooden material of the present invention, the wooden material can be easily operated and / or installed in a state in which a high reinforcing property is expressed with respect to the wooden material and a good working environment is maintained. Excellent effect that can be reinforced with. Moreover, the reinforced wood material of this invention shows the outstanding physical strength which shows the outstanding physical strength, and can be manufactured by simple operation and / or a facility.

  In one embodiment, the wood material reinforcing impregnating paint of the present invention has a binuclear content of 50 to 90%, a viscosity at 25 ° C. of 80 mPa · s or less, and a liquid at room temperature. The present invention relates to an impregnating paint for reinforcing a wood material, which contains methylene polyphenyl polyisocyanate.

  Since the impregnating paint for reinforcing a wood material of the present invention contains the polymethylene polyphenyl polyisocyanate, it has an excellent effect of exhibiting a high reinforcing property for the wood material. Moreover, according to the wood material reinforcing impregnating paint of the present invention, when the wood material reinforcing impregnating paint is applied to the wood material, an excellent effect that a good coating surface state can be obtained is exhibited. . Furthermore, according to the impregnating paint for reinforcing a wooden material of the present invention, excellent strength can be imparted to a wooden material, particularly a dense wooden material. Further, the impregnating paint for reinforcing a wooden material of the present invention does not substantially generate odor and the like, and can easily operate the wooden material in a state where a good working environment is maintained as compared with the case of using an organic solvent. And / or can be reinforced at the facility.

  The dinuclear content in the polymethylene polyphenyl polyisocyanate is preferably 50% or more and 60% or more from the viewpoint of obtaining a suitable viscosity and sufficiently exhibiting workability and reinforcement. More preferably, it is preferably 90% or less, and more preferably 85% or less. If the dinuclear content exceeds 90%, it may become solid or crystallize. If it is less than 50%, the viscosity increases and dilution with a solvent or the like may be required.

In the present specification, the dinuclear content of the polymethylene polyphenyl polyisocyanate means the content of two benzene rings and is determined by gel permeation chromatography (GPC). Here, in the gel permeation chromatography, a high-speed GPC device (manufactured by Tosoh Corporation, trade name: HLC-8020) and a GPC column (manufactured by Tosoh Corporation, inner diameter 7.8 mm, length 30 cm, trade name: TSKgel G6000H). HR, G4000H HR, G3000H HR, G2000H HR (H _HR series)] and a differential refractor as a detector. The conditions of the gel permeation chromatography are: mobile phase solvent: tetrahydrofuran, temperature: 40 ° C., flow rate: 0.8 ml / min, and sample 80 μl. The sample used for the measurement was 10 ml of butanol and 5 ml of ethyl acetate added to 1 g of the target polymethylene polyphenyl polyisocyanate, left overnight, the resulting product was concentrated, and the resulting concentrate was equivalent to 5 mg. Is dissolved in 2.5 ml of tetrahydrofuran, and the resulting product is obtained by filtration through a membrane filter (PTFE, 0.45 μm). Prior to the evaluation of the sample, the elution position of diphenylmethane diisocyanate (binuclear 100%) is obtained in advance under the same conditions as in the case of the sample, and the sample is evaluated based on the elution position. The binuclear content (%) is obtained by multiplying the value of the peak area at the elution position corresponding to the diphenylmethane diisocyanate of the binuclear by the reciprocal of the numerical value of the total peak area and 100 of the sample peaks. It is done.

  The viscosity of the polymethylene polyphenyl polyisocyanate at 25 ° C. is 80 mPa from the viewpoint of improving the permeability of the impregnating paint for reinforcing the wooden material to the wooden material and obtaining a good coating surface state to the wooden material. · It is preferably s or less, more preferably 40 mPa · s or less, and even more preferably 10 mPa · s or less. When the viscosity at 25 ° C. of the polymethylene polyphenyl polyisocyanate exceeds 80 mPa · s, it takes time to penetrate, so that an efficient working environment in line production may not be maintained. Therefore, dilution with a solvent or the like may be required. In the present specification, the viscosity means a value measured at 25 ° C. using a rotational viscometer (trade name: B-type rotational viscometer BM, manufactured by Burgfield) in accordance with JIS Z8803.

  Typical examples of the polymethylene polyphenyl polyisocyanate include, for example, the general formula (1):

And the like, or a mixture thereof. Note that n in the above formula has a dinuclear content of 50 to 90% in the compound represented by the general formula (1), and n = 0 or, for example, 1, 2, 3, 4, etc. Any positive integer can be used.

  The impregnating paint for reinforcing a wood material of the present invention may further contain a plasticizer, a catalyst, a surfactant and the like.

  In another aspect, the present invention relates to a reinforced wooden material, wherein the wooden material is impregnated with an impregnating paint for reinforcing a wooden material.

  Since the reinforced wooden material of the present invention is coated with the above-mentioned impregnating paint for reinforcing a wooden material, it exhibits excellent physical strength. Moreover, the reinforced wood material of this invention can be manufactured by simple operation and / or a facility.

  Although it does not specifically limit as said wooden material, The material cut out and manufactured from the tree; The material manufactured by pressing and solidifying a wooden chip, a concrete form plywood, a wooden fiber, a wooden powder, etc. are mentioned.

  The reinforced wooden material of the present invention can be easily produced by coating a wooden material with an impregnating paint for reinforcing a wooden material.

  EXAMPLES Hereinafter, although an Example etc. demonstrate this invention in detail, this invention is not limited to this Example.

Example 1
Polymethylene polyphenyl polyisocyanate [manufactured by Nippon Polyurethane Industry Co., Ltd., trade name: Millionate MR-200, NCO content 31.0%,] 100 parts by weight of diphenylmethane diisocyanate [manufactured by Nippon Polyurethane Industry Co., Ltd., trade name : Millionate MT, NCO content 33.6%] 100 parts by weight were mixed and stirred at 60 ° C. for 30 minutes.

  About the obtained product, NCO content rate (%) was performed based on the method prescribed | regulated to JISK7301.

  As a result, a polymethylene polyphenyl polyisocyanate having an NCO content of 32.0% and a dinuclear content of 54% was obtained. Such polymethylene polyphenyl polyisocyanate was designated as Isocyanate 1.

(Comparative Example 1)
Polymethylene polyphenyl polyisocyanate [manufactured by Nippon Polyurethane Industry Co., Ltd., trade name: Millionate MR-200, NCO content 31.0%, dinuclear content 41%] was designated as isocyanate 2.

(Comparative Example 2)
Diphenylmethane diisocyanate [manufactured by Nippon Polyurethane Industry Co., Ltd., trade name: Millionate MT, NCO content 33.6%, dinuclear content 100%] was designated as isocyanate 3.

(Test Example 1)
About the isocyanate 1 of the said Example 1, the isocyanate 2 of the comparative example 1, and the isocyanate 3 of the comparative example 2, based on JISZ8803, using a rotational viscometer [Burkfield company make, brand name: B type rotational viscometer BM]. Then, the viscosity at 25 ° C. was measured.

Moreover, as a wood material, the isocyanate 1 of Example 1 or the isocyanate 2 of the comparative example 1 was apply | coated so that it might be set to 0.1 g / 1cm < ² > with respect to the medium fiber board based on JISA5905, and it prescribes | regulates to JISK7100. Under standard conditions (25 ± 2 ° C., relative humidity 50 ± 5%).

  Then, the painted surface state of the wooden material was observed visually, with a finger, and with a microscope. In addition, evaluation of the coating surface state was observed with 10 monitors, and the case where a cured coating film was not observed was evaluated as “good”.

  Next, the strength of the coated surface of the wood material coated with the isocyanate 1 of Example 1 or the isocyanate 2 of Comparative Example 1 is specified in JIS K7100 using a type D durometer in accordance with the method specified in JIS K7215. Measured under standard conditions (25 ± 2 ° C., relative humidity 50 ± 5%). Moreover, the intensity | strength of the untreated wood material was measured similarly (comparative example 3).

  These results are shown in Table 1.

  As a result, as shown in Table 1, the viscosity of the isocyanate 1 of Example 1 is 40 mPa · s, and the isocyanate 2 of Comparative Example 1 is 200 mPa · s. In addition, since the isocyanate 3 of the comparative example 2 became a powdery solid, the viscosity could not be evaluated.

  Further, as shown in Table 1, when using the isocyanate 2 of Comparative Example 1, when the wood material was coated with the isocyanate 1 of Example 1 despite the formation of a cured coating film, It turns out that it becomes a favorable paint surface state. Further, as shown in Table 1, it can be seen that the strength of the wood material coated with isocyanate 1 of Example 1 is higher than that of the untreated wood material of Comparative Example 3. In addition, since the isocyanate 3 of the comparative example 2 became powdery solid, the coating surface state was not able to be evaluated.

  According to the present invention, it is possible to reinforce a wooden material with a simple operation and / or facility at a low cost while maintaining a good working environment. Moreover, according to this invention, the wooden material which has low physical cost and excellent physical strength can be provided.

Claims (2)

  A wood material characterized in that it contains polymethylene polyphenyl polyisocyanate having a binuclear content of 50 to 90%, a viscosity at 25 ° C. of 80 mPa · s or less, and a liquid at room temperature. Impregnating paint for reinforcement.   A reinforced wood material, wherein the wood material is impregnated with the impregnating paint for reinforcing a wood material according to claim 1.