JPH0324905A - Reinforced member of cypress - Google Patents

Abstract

PURPOSE:To enable the texture of the stock of cypress itself to be kept, while its hardness is improved by a method in which the cypress timber is impregnated with water soluble amino resin and is cured, and then after the impregnating and curing, the whiteness and the yellowness of its surface and the solid content of resin are specified. CONSTITUTION:A cypress member is impregnated with water soluble amino resin and is cured. The reinforced timber of cypress having the surface of the cypress timber after impregnating and curing having the whiteness (JISP-8123 standard) of 25-50 and the yellowness (JISK-5400 standard) of 30-60, and containing the water soluble amino resin and for impregnation of 5-30wt.% to the cypress timber by solid content of resin, is provided. The shape (thickness, length and width etc.) and the moisture content of the cypress timber to be used are not limited especially, but the thin plate to be impregnated easily with resin having the thickness of 0.2-10mm and the moisture content of 5-100% is preferably used. As the water soluble amino resin used for impregnation, a single material of amino resin, benzoguanamine resin, acetoguanamine resin and urea resin etc. or a cocondensation material or the mixture thereof may be applicable.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to cypress wood, which is widely used for construction materials such as floors, walls, ceilings, and columns, or for side panels of furniture, doors, etc. This is a reinforced cypress material that improves the hardness of the cypress material by impregnating and curing it with a cypress-based resin and retains the texture of the cypress material itself.

(Prior Art) In recent years, reinforced wood treated with resin for the purpose of improving the strength of wood has been widely used in applications requiring strength.

The reinforced wood is made of, for example, a thermosetting resin that has a strength-improving effect such as unsaturated polyester resin, epoxy resin, vinyl ester resin, acrylic resin, urethane resin, phenol resin, melamine resin, or MMA, SM, G as a resin.
Polymerizable monomers such as MA (glycidyl methacrylate), polyethylene glycol methacrylate, etc. alone or a mixture of these polymerizable monomers and the thermosetting resin mixed with these polymeric monomers are used as an impregnating liquid, and wood is applied by immersion, reduced pressure, or pressure. WPC, reinforced wood that has been impregnated and cured using either the pressure method or vacuum pressure method, or the above-mentioned thermosetting resins, etc. Reinforced wood that has been coated thickly with these resins and cured for the purpose of imparting strength is generally used. is known for.

Reinforced wood that uses diallyl phthalate resin as an impregnating resin and reinforced wood that has a pigment or dye such as titanium white added to the impregnating resin are known as reinforcing materials that have a material feel.

However, in these conventional reinforced woods, the color tone and feel inherent to natural woods are lost due to the synthetic resin used for reinforcement. Such drawbacks can be improved, for example, by using diallyl phthalate resin as the precipitate resin, but since an organic solvent is used, there is a drawback that resin dissolves into the impregnated resin solution and becomes colored when used repeatedly. In addition, by adding pigments etc. to the resin that is forcibly injected, it is possible to obtain reinforced wood that is colored under certain conditions and has a texture, but in the case of wood, when the resin is forcibly impregnated with a resin in which pigments are dispersed, the impregnation of the resin and pigment is reduced. Due to the difference in color, there is a disadvantage that uneven coloring tends to occur on the surface of reinforced wood.

(Problems to be Solved by the Invention) The present invention provides reinforced cypress wood that has been impregnated with resin to further improve its hardness, and that retains the natural color and feel of the wood surface, that is, the original feel of the material. The aim is to provide materials.

(Means for Solving the Problems) The present invention impregnates and cures a water-soluble amine-based resin into cypress wood, and the whiteness of the surface of the cypress wood after impregnation and hardening (JISP-8
123 standard) 25-40 and yellowness (JISK-540
0 standard) 30 to 60, and contains a water-soluble amino resin impregnated with the solid content of 5 to 30 percent based on the solid content of the cypress material. The cypress wood used in the present invention is not particularly limited in shape (thickness, length, width, etc.), moisture content, etc., but it is a thin plate shape that can be easily impregnated with resin, and has a thickness of 0.2~ 10n, moisture content 5
~100% is preferred.

Veneers that have been subjected to solvent treatment, consolidation treatment, or various other pretreatments can also be used.

The water-soluble amino resin to be impregnated has excellent adhesion to wood and has a particularly large hardness improvement effect, and is less colored by extracts from cypress wood than solvent-based resins. ``ξ'' resin, penzoguanamine resin, acetoguanamine resin, urea resin, etc. alone or co-condensates and mixtures of these resins can be used, but melamine resin, urea resin and urea melamine resin can be used.
Cocondensation resins are preferred. The impregnation rate is 5 to 30% by weight (solid content) based on the cypress wood (in an absolutely dry state). If the impregnation rate is less than 5%, the reinforcement of the cypress wood required by the present invention cannot be expected, and if it exceeds 30%, the resin will cause the wood to become wet and lose its texture.

In addition, substances that improve the inclusion property, such as surfactants and solvents, which are generally widely known, can be used in combination with the above resin as appropriate.

The impregnation method is not particularly limited, and includes immersion method, pressurization method, depressurization method,
Although any commonly used method such as the vacuum pressure method can be used, the forced impregnation method is preferable because it requires a short processing time.

The general method for curing impregnated resin is to use a catalyst.
The catalyst may be any catalyst as long as it achieves the purpose of curing the resin. For example, organic acids such as formic acid, acetic acid, butyric acid, and lactic acid; inorganic acids such as hydrochloric acid, sulfuric acid, and phosphoric acid, singly or in mixtures; and commonly used ammonium salts and metal salts of these acids. Either can be used. Furthermore, since the impregnated resin can be recycled, volatile alkaline substances such as ammonia and amines can be added. Furthermore, substances that generate acidic substances by heat or the like, such as amine hydrochloride, act as latent catalysts, and these can also be used.

Furthermore, by applying heat during curing of the resin, the curing time can be shortened and moisture in the wood can be removed, so a heat curing method is common. In particular, the method of applying heat while pressurizing the resin-impregnated cypress wood with a hot press is preferable because it can also be expected to prevent deformation of the wood when the resin hardens.

In the present invention, based on cypress material, JISZ-8722
The yellowness calculated by JISK-5400 from the 2-degree visual field X, Y, Z determined by the object color measurement method specified in It is aimed at reinforcing cypress. That is, the yellowness is 30 to 60 and the whiteness is 25 to 5.
0.

Generally, the yellowness Y■ is used to measure the yellowness near white, and white light is YI=O, but in the present invention, when the yellowness Yl exceeds 60, the yellow feeling becomes strong, and 30
If it is less than that, the yellow color will be poor, and neither is the objective of the present invention. In addition, whiteness defines the brightness of the object color, and generally white light has a WB of 100, while pure black has a WB of 0.
However, in the present invention, if the WB exceeds 50, it is too bright and white, and if it is less than 25, it becomes too dark, and neither of these results satisfies the material texture of cypress, which is the object of the present invention.

In the present invention, it is defined by both yellowness and whiteness,
Even if either one of them is outside the specified range, the texture of cypress cannot be obtained. The texture of cypress referred to in the present invention is the color immediately after being made into lumber, but before it is affected by ultraviolet rays, because cypress changes color over time due to the influence of ultraviolet rays.

Depending on the application, the cypress reinforcing material of the present invention may be made of wood-based boards such as plywood, verticle board, hardboard, etc. or inorganic boards such as gypsum board, Keisan calcium board, etc.
Asbestos cement board, iron plate, aluminum board, etc. or various organic board materials such as urethane foam, phenol foam,
It can also be used by adhering to acrylic boards, PVC boards, etc. Further, secondary processing such as painting can be performed as necessary to improve various functions such as strength, durability, stain resistance, water resistance, and resistance to ultraviolet discoloration.

(Example) The present invention will be further explained below with reference to Examples.

Thickness: 1. Prepare an air-dried veneer sliced into 0 mm pieces. On the other hand, as an impregnating resin,
Ammonium chloride is added to 100 parts by weight of urea-melamine resin aqueous solution (solid content 20%). A resin solution is prepared by adding 5 parts by weight. 7 2 by vacuum pressure method on the prepared cypress veneer
0 mlLg3 10 kg/cn+ after 0 minute decompression
Pressure is applied for 30 minutes to forcibly impregnate the resin, resulting in a resin impregnation rate of 25%.
A cypress impregnated veneer of (weight ratio to cypress veneer, resin solid content, same hereinafter) was obtained. This cypress impregnated veneer was heated to 130°C.
lOkg/cll12 ・Heat-pressure hardening was performed using a hot press for 2 minutes. The obtained cypress reinforcing material had the texture of cypress and had sufficient hardness.

Implementation Plate 1 Prepare an air-dried cypress veneer with a thickness of 10 sieves. On the other hand, as an impregnating resin, an aqueous Meradan resin solution (
Solid content 20%) 100! A resin solution was prepared by adding 1 part by weight of monoethanolamine hydrochloride to 1 part by weight. 720 mmlg was applied to the prepared cypress veneer using the reduced pressure method.
After reducing the pressure for 1 hour, the pressure was applied to 10 kg/c++ for 1 hour to forcibly impregnate the resin to obtain a cypress impregnated veneer with a resin impregnation rate of 15%.
/cIII2 - Heat pressure curing was carried out using a hot press for 15 minutes. The obtained cypress reinforced material had the woody feel of cypress and had sufficient hardness.

Fuse Tsuki 1 As a cypress veneer, thickness 0. Prepare an air-dried veneer sliced into 5 mm pieces. On the other hand, as a resin for impregnation, a resin solution prepared by adding 1.0 parts by weight of aluminum chloride to 100 parts by weight of a urea-melane resin aqueous solution (solid content 25%) is prepared. The resin was forcibly impregnated for 1 hour to obtain a cypress impregnated veneer with a resin content of 20%.The cypress impregnated veneer was heated at 120°C.
0kg/cm" ・Heat-pressure hardening was carried out using a hot press for 2 minutes. The obtained cypress reinforcement material was adhered to the surface of a 12 mm thick plywood board using a water-based vinyl urethane resin adhesive. The plywood with cypress reinforcement on its surface exhibited the beautiful wood grain tone of cypress and was scratch resistant.

Comparative example l As a cypress veneer, the thickness was 1. Prepare 0 an sliced veneer. 13 with hot press without resin impregnation
0'C・10kg/cm2 ・Heat-press molded for 2 minutes.

Although the obtained cypress veneer had gaps between materials, no improvement in hardness was observed and the surface was easily scratched.

As a cypress veneer, the thickness is 1. Prepare an air-dried veneer sliced to 0 + nm. On the other hand, as an impregnating resin, an impregnating solution is prepared by adding 0.5 parts by weight of aluminum ξ chloride to 100 parts by weight of an aqueous solution of urea-melamine resin (solid content 25%). 720mm by vacuum pressure method on the prepared cypress veneer
After depressurizing Hg for 2 hours, pressurizing it to 15 kg/cm" for 2 hours to forcibly impregnate it with resin to obtain a cypress impregnated veneer with a resin impregnation rate of 50%. Furthermore, hot press at 130" C. 10 kg/cm"
・I applied heat and pressure for 2 minutes. The resulting cypress reinforced material had a candy-colored appearance due to the resin, and although its hardness was improved, it had a high degree of yellowness, lost the wood grain color tone inherent to cypress, and lacked the feel of the material.

Base 1: Prepare a 1.0m thick sliced veneer of air-dried cypress as a veneer. On the other hand, as an impregnating resin, 100 parts by weight of an unsaturated polyester resin, 1 part by weight of benzoyl peroxide, and 0.0 parts by weight of titanium white as a white pigment. Prepare an impregnating solution containing 5 parts by weight.

A pressure of 720mmHg30 was applied to the prepared cypress veneer using the reduced pressure method.
After reducing the pressure for one minute, the pressure was applied to 10 kg/cm23 for 0 minutes to forcibly impregnate the resin, thereby obtaining a veneer impregnated with resin at a rate of 100%.

Furthermore, hot press at 135°C, 10kg/cm2,
The mold was cured under heat for 10 minutes. The obtained cypress reinforcing material had lumps of titanium white pigment scattered on its surface, and had an extremely poor appearance.

The performance test results of the obtained cypress reinforcement material are shown in the table below, and compared to the examples, the balance of wood texture hardness was poor,
The results were inferior in both cases, such as poor surface appearance.

(Effects) As shown in the examples, the cypress reinforcing material according to the present invention is impregnated with 5 to 30% water-soluble amino resin, so it does not exhibit amber color and retains the beautiful wood grain tone of cypress wood, giving it a texture. Moreover, it was made of cypress wood with high hardness that made it difficult to get scratches during actual use.

Claims (1)

[Claims] Hinoki wood is impregnated with a water-soluble amino resin and cured, and the surface whiteness (JISP-8123 standard) of 25-50 and yellowness (JISK-5400 standard) of 3 after impregnation and hardening.
0 to 60, and contains 5 to 30% by weight of the impregnated water-soluble amino resin based on the solid content of the cypress material.