JPS61197226A - Manufacture of compregnated wood - Google Patents

Abstract

PURPOSE:To manufacture compregnated wood which is superior in strength and water resistance, by a method wherein title wood is either kept preimpregnated with resorcinol resin or kept impregnated with resin to which said resin has been added, in a method impregnating and laminating a base material with phenolic resin. CONSTITUTION:A veneer is preimpregnated with a resorcin or a condensate of the same and formaldehyde, for example, resorcinol resin, which is made to dry. Then the veneer is impregnated with the normal formaldehyde resin, for example, phenolic resin, dried and made into the treated veneer twenty sheets of which are laminated, heated, pressurized and made into compregnated wood. In place of preimpregnation, the veneer may be impregnated at a time with the phenolic resin by adding resorcinol resin. The compregnated wood which is favorable in permeability to a base material and resin retention and is superior in strength and water resistance is obtained.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing reinforced wood.

Conventionally, the method for manufacturing reinforced wood has been to hot-press mold a sheet metal with a high rate of treatment, in which various types of veneer are impregnated with phenolic resin or the like. In this impregnation process, if a resin with good impregnation properties is used, the resin residual rate on the surface part will be reduced, and the adhesion between the veneers will be 959. Conversely, if the resin residual rate in the surface part is high, the permeability into the inside of the veneer will be increased. In addition, if the resorcinol cocondensation resin for impregnation is produced in advance, unreacted formalin and 90 The present invention relates to a method for producing reinforced wood that solves these problems, including problems such as poor storage stability due to the large amount of methylol compounds. After the object is impregnated, treated substrates impregnated with formaldehyde-based thermosetting resin (hereinafter referred to as formaldehyde-based resin) are laminated and molded, or resorcinol, alkylresorcinol, or their reaction products with formaldehyde and do. This relates to a method for producing reinforced wood characterized by laminating and molding treated base materials obtained by impregnating the base materials with a resin solution containing formaldehyde-based resin. There are no particular restrictions as long as the material is porous and porous, such as veneer made of Mji resin, paper made from various f&fiber materials, nonwoven fabrics, and cloth. Regarding the veneer, it is preferable to use a material with a thickness of about 0.5 to 5 MM in view of the permeability of the resin.Formaldehyde resins include reactants of formaldehyde and materials that can react with formaldehyde, such as phenol, melamine, and urea, or co-condensation thereof. things are used. Materials used prior to or added to the formaldehyde-based resin include the above-mentioned resorcinol, alkylresorcinol, or their reactants with formaldehyde (hereinafter collectively referred to as compounding agents); This section describes how to process and use the .

The method of impregnating the compound into the base material as a pre-treatment step is to dilute the compound to 5-20% with a diluting solvent, crush the untreated veneer with this, dry it, and then apply the formaldehyde resin again. A treated base material for molding is obtained by impregnation treatment with a liquid. In the method of adding to formaldehyde resin, the compounding agent is added, diluted with a diluting solvent, and the base material is impregnated to obtain a molding base material. The ratio of the compounding agent to be used is 4 to 30% in terms of solid content. If it is less than 4%, the quality of reinforced wood,
The objects of the present invention, such as molding workability, cannot be achieved, and if it exceeds 30 strands, resin loss occurs and the reaction with unreacted formalin and initial methylol compound becomes insufficient, which is not preferable.

The method of laminating the treated substrates may be a method of laminating the same treated substrates, or a method of laminating different types of treated substrates.

In the method for manufacturing reinforced wood according to the present invention, the base material is pretreated with a highly reactive compound, or the base material is impregnated with a formaldehyde resin, which improves the adhesive strength and water resistance of the molded product. The residual rate of unreacted formaldehyde and initial methylolated products, which deteriorate performance such as properties, is significantly reduced.

In addition, the curing properties of the resin are improved and the curing time is shortened.
The amount of resin flowing out during molding is reduced and the resin content of the molded product is increased. As described above, by the method of the present invention, it is possible to improve the quality and performance of the molded product, and to improve the molding work efficiency by shortening the molding time.

Next, examples will be explained.

Example-1 Resorcinol formaldehyde resin (Aika Neoresin PE-185, active ingredient 80
%) was diluted with methanol to give 11% of the active ingredient.
1I! l! After being immersed in the treated solution for 12 hours, it was air-dried and further dried at 60° C. for 3 hours to obtain a pretreated veneer with a treatment rate of 9.2%. The pretreated veneer was immersed in phenol formaldehyde resin (Aika Neoresin P-70) and heated at 50T.
Impregnation was performed by leaving it for 1 hour under OYY and 1 hour under normal pressure, and then drying with hot air at 60°C for 3 hours to obtain a total treatment rate of 39.
A 5% treated veneer was prepared. Multiply 20 of these by 1 horizontally and get 13
Reinforced wood with a compressibility of 65 cm was molded through heat pressing at 5°C for 25 minutes. The properties of the molded product and the results of the performance test are shown in Table 1.

Example-2 Phenol formaldehyde resin (Aika Neoresin P
-70) Immerse Mizume wood in a resin solution prepared by adding 10 parts of resorcinol/formaldehyde resin (Aika Neoresin PE185, active ingredient 70%) to 100 fl'ls, and leave it under normal pressure for 1 hour under 50 Toy Y. Impregnation was carried out for 1 hour, followed by hot air drying at 60° C. to produce a treated veneer with a treatment rate of 40.5%. 20 sheets of this were laminated and heated at 135° C. for 25 minutes to form a reinforced wood with a compression ratio of 6596. The properties of the molded product and the results of the performance test are shown in Table-1.

Comparative Example-1 Phenol formaldehyde resin (Aika Neoresin P
-70), put 11m of Mizume wood t-iu into the stock solution and 50T
Impregnation was carried out for 1 hour under OYY and 1 hour under normal pressure at 60°C.
A treated veneer with a treatment rate of 42.5% was prepared by drying with hot air. 20 sheets of this were stacked and heated at 135°C for 40 minutes.
After that, reinforced wood with a compression ratio of 65 cm was molded. The properties and performance test results of the molded product are as shown in Table-1.

Comparative Example-2 Phenol formaldehyde resin (Aika Neoresin P
-70) in the stock solution of IJ! A Mizuno material with a thickness of Il was immersed for 10 minutes under normal pressure and dried with hot air at 60°C to achieve a treatment rate of 28.
．． An 8% treated veneer was prepared. Stack 20 of these to make one
Strengthened rice with a compression ratio of 65% was molded through hot pressing at 35°C for 40 minutes. The properties of the molded product and the results of the performance test are shown in Table-1.

*Strength test method ΔNormal compression shear strength JIS Z2114 number of test pieces n
=4 ΔNormal grinding strength span 180go+, loading speed 5g1111/min
66-hour boiling foil test, thickness change rate, overlapping change rate A piece of foil with a thickness of 18 m, a length of 50 cm, and a width of 505 m.

Claims (1)

[Claims] After a base material is impregnated with resorcinol, alkylresorcinol, or a reaction product of these with formaldehyde, a treated base material impregnated with a formaldehyde-based thermosetting resin is laminated, or the base material is coated with the formaldehyde-based thermosetting resin. A method for producing reinforced wood, which comprises laminating treated substrates impregnated with a resin solution containing resorcinol, alkylresorcinol, or a reaction product of these with formaldehyde, and hot-pressing the laminated substrates.