JPH0324904A - Reinforced member of cypress - Google Patents

Abstract

PURPOSE:To enable the natural color tone or the texture of wood surface to be sufficiently kept, while its hardness is improved by a method in which the cypress timber treated under compacting pressure in impregnated with water soluble amino-resin and is cured, and then the whiteness and the yellowness after impregnating and curing are specified. CONSTITUTION:The cypress member treated under compacting pressure in the range of the compression ratio of 10-70%, is impregnated with water soluble amino resin and is cured. The reinforced timber of cypress having the surface after impregnating and curing with the whiteness (JISP-8123 standard) of 25-50 and the yellowness (JISK-5400 standard) of 30-60, and containing the water soluble amino resin used for impregnation of 5-30wt.% to the cypress timber by solid content of resin, is provided. As the pressure-compacting method of the cypress, press method or roll method is preferably used. The water soluble amino resin used for impregnation has excellent adhesion to the wood and especially high hardness-improving effect, and more over the coloring due to extract from the cypress is less than in the case of the solvent resin. As the water soluble amino resin, if a single material of amino resin and benzoguanamine resin etc. or the cocondensation material or the mixture thereof are selected, any of them may be used.

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 the cypress resin and retains the texture of the cypress material itself.

(Prior Art) In recent years, reinforced wood treated with a 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) and polyethylene glycol methacrylate alone, or a mixture of a plurality of them, and a mixture of these polymeric monomers and the thermosetting resin are used as an impregnating liquid, and wood is soaked in the impregnating liquid.
WPC, reinforced wood impregnated and cured by any method such as reduced pressure method, pressurization method, reduced pressure pressurization method, etc., or reinforced wood made by applying these resins thickly to wood and curing them for the purpose of imparting strength, such as the above-mentioned thermosetting resins. etc. are generally known.

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 wood are lost due to the resin used for reinforcement. Such drawbacks can be improved, for example, by using diallyl phthalate resin as the coalescing 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.

Furthermore, a method of compacting cypress wood to improve its hardness is widely known, but compacted cypress wood tends to return in the thickness direction when it absorbs moisture. As a method to improve this drawback, a method has been proposed in which a resin is applied or impregnated and cured and fixed. However, the purpose of these treatments was to improve strength such as hardness, and the treated resin had a wet color and no texture.

Furthermore, the present inventors previously discovered that the texture of cypress wood can be seen in two degrees of visual field, X and Y. The color system determined from the stimulus value displayed in the Z system can be defined by WB and YI, and the range of WB of 25 to 50 and YI of 30 to 60 has the feel of cypress wood, and is water soluble. It has been discovered that by impregnating and curing a predetermined amount of amino resin, a cypress reinforcing material with a material feel can be obtained.

(Problems to be Solved by the Invention) The present invention improves the hardness by impregnating the wood with resin, and also sufficiently retains the natural color tone and feel of the wood surface, that is, the original texture of the material is sufficiently retained. Our objective is to provide reinforced cypress reinforcement materials. (Means for Solving the Problems) The present invention involves impregnating and curing a water-soluble amino-based resin in cypress wood that has been compacted to a compression ratio of 10 to 70%. It has a whiteness (JISP-8123 standard) of 25-40 and a yellowness (JIS II-5400 standard) of 30-60, and contains 5-30% by weight of the impregnated water-soluble amino resin based on the resin solid content based on the cypress wood. We provide reinforcing material made from Japanese cypress.

The cypress wood used in the present invention is not particularly limited in shape (thickness, length, width, etc.), moisture content, etc., but is in the form of a thin plate that is easily impregnated with resin, and has a thickness of 0. 2 to 10++n and a water content of 5 to 100% is preferred.

Any commonly used method may be used to compact the veneer, but press methods and roll methods are preferred.

Further, compression of the veneer can be performed at room temperature or under heating, but it is more preferable to apply heat because compression becomes easier.

The temperature during heating is not subject to any restrictions, but is 50 to 1
50'C is common. The pressure during compression is not particularly limited as long as it can obtain the compression ratio specified in the present invention, but in the case of a press method, it is 5 to 200 kg/cm.
, preferably 20 to 100 kg/c. The compression ratio of cypress wood is 10-70%, preferably 40-60%
%. If it is less than 10%, the hardness improvement effect is insufficient,
If it exceeds 70%, there are problems such as it is difficult to crush mechanically, requires high pressure, and cannot maintain the beautiful natural wood grain of cypress wood, making it impossible to obtain the cypress reinforced material that is the object of the present invention.

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. Any resin, penzoguanagon resin, acetoguanamine resin, urea resin, etc. alone or a co-condensate or a mixture of these resins can be used, but melamine resin, urea resin and urea-melamine co-condensate resin are preferable. The impregnation rate is 2 to 30% (solid content) by weight of the cypress wood (in an absolutely dry state). If the impregnation rate is less than 2%, the reinforcement of the cypress wood required by the present invention cannot be expected, and if it exceeds 30%, the resin will turn the wood wet and the texture of the cypress wood will be lost.

In addition, commonly known substances that improve the inclusion property, such as surfactants and solvents, can also be used 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 combination; 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 agone 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, heat curing is commonly used because the addition of heat during curing of the resin shortens the curing time and removes moisture from the wood. In particular, the method of applying heat while pressurizing the resin-impregnated cypress with a hot press is preferable because it can also be expected to prevent deformation of the wood when the resin hardens.

In addition, the cypress wood is compacted and further impregnated with a water-soluble amino resin at an impregnation rate of 2 to 30% and cured to achieve the color range that the inventor previously defined as the texture of the material. Not only can a reinforced cypress material be obtained, but it also has the effect of suppressing the phenomenon of recoil in the thickness direction when absorbing moisture, which was a practical problem with consolidated cypress materials, and the original objective of improving hardness is remarkable.

This is due to the fact that the water-soluble amino resin has good adhesion to wood and has the effect of fixing wood during compaction.

In the present invention, JrSZ-8722 is based on cypress material.
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.

In general, the yellowness Yl is used to measure the yellowness near white, and white light is YI=O, but in the present invention, when the yellowness Y 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 plate, 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.

Example 1 A cypress veneer with a thickness of 1. Air-dried veneer sliced into 0 mm pieces was hot-pressed at 120'C.
A cypress veneer with a compression rate of 30% is prepared by compressing it for 30 seconds under the condition of 30 kg/c-. On the other hand, as an impregnating resin, a resin solution prepared by adding 0.5 parts by weight of ammonium chloride to 00 parts by weight of an aqueous solution of urea-melagon resin (solid content 25%) was prepared. 720asHg was applied to the prepared cypress veneer using the reduced pressure method.
After reducing the pressure for 30 minutes, the pressure was applied at 10 kg/CIll2 for 30 minutes to forcibly impregnate the resin, to obtain a cypress impregnated veneer with a resin impregnation rate of 25% (the weight ratio of the cypress veneer, the same below the resin solid content).

This cypress impregnated veneer was heated to 130°C and 10kg/cm.
It was hardened by hot press for 2.2 minutes. The obtained cypress reinforcing material had a texture and sufficient hardness.

Example 2 As a cypress veneer, an air-dried veneer sliced to a thickness of 1.0 mm was hot pressed at 120'C at 80 kg/
Prepare a cypress veneer with a compression rate of 50% by compressing it for 30 seconds under CI12 conditions. On the other hand, as a resin for inclusion, 100 parts by weight of a melamine resin aqueous solution (solid content 20%) and 0.00 parts by weight of ammonium chloride. Add 5 parts by weight of the resin solution. The prepared cypress veneer was forcibly impregnated with resin by applying a reduced pressure method to 720 ma + Hg for 1 hour and then pressurized to 10 kg/ell for 1 hour to obtain a cypress impregnated veneer with a resin impregnation rate of 15%. Plate at 130°C-1 0kg
/c+w" - Hot press molding was carried out under the conditions of 5 minutes. The obtained cypress reinforced material had a texture and sufficient hardness.

Example 3 A cypress veneer with a thickness of 0. Air-dried veneer sliced into 5 m pieces was hot-pressed at 120°C and weighed 30 kg/
A cypress veneer with a compression ratio of 30% is prepared by compressing it for 30 seconds under the conditions of c-. On the other hand, an aqueous urea resin solution (
0.5 parts by weight of aluminum chloride per 100 parts by weight (solid content 25%)
Prepare a resin solution by adding parts by weight. The prepared cypress veneer was forcibly impregnated with resin using a reduced pressure method at 720 MHg for 20 minutes to obtain a cypress impregnated veneer with a resin impregnation rate of 10%.

Furthermore, a water-soluble vinyl urethane resin adhesive was applied to an asbestos cement board with a thickness of 9 mm, a cypress-impregnated veneer was applied to the surface, and a hot press was applied at 120℃ and 10kg/C-5.
The hardening of the impregnated resin and adhesion of the asbestos board and cypress reinforcing material were performed at the same time. The obtained composite material was an asbestos board that had the texture of cypress on its surface and was reinforced with cypress reinforcing material having sufficient hardness.

Comparative Example 1 As a cypress veneer, an air-dried veneer sliced to a thickness of Intm was hot pressed at 120°C and 30 kg/c.
It was hot-pressed under the same conditions for 30 seconds. Although the obtained cypress veneer showed an improvement in hardness at a compression ratio of 30%, it was not sufficient, and a phenomenon of returning in the thickness direction when absorbing moisture was observed.

Comparative Example 2 An air-dried veneer sliced to a thickness of 1 mm is prepared as a cypress veneer. On the other hand, as an impregnating resin, 100 parts by weight of a urea-melamine resin aqueous solution (solid content 25%) and 0.00 parts by weight of ammonium chloride were used. A resin solution is prepared by adding 5 parts by weight. Vacuum pressure method 720inHg was applied to the prepared cypress veneer.
After reducing the pressure for 30 minutes, the pressure was applied to 10 kg/cm" for 30 minutes to forcibly impregnate the resin to obtain a cypress impregnated veneer with a resin impregnation rate of 25%.
The resulting cypress reinforced material had a material feel, and although an improvement in hardness was observed, the hardness was insufficient.

Comparative Example 3 A cypress veneer with a thickness of 0. Air-dried veneer sliced into 5 mm pieces was hot-pressed at 120'C.
Compression rate: 30% when heated for 30 seconds at 30kg/c
obtained cypress wood. On the other hand, as an impregnating resin, a resin liquid is prepared by adding 1 part by weight of monoethanolamine hydrochloride to 100 parts by weight of an aqueous urea-melamine resin solution (solid content 25%). 720mm by vacuum pressure method on the prepared cypress veneer
After reducing the pressure of Hg for 2 hours, the pressure was applied at 10 kg/cm'' for 2 hours to forcibly impregnate the resin to obtain a cypress impregnated veneer with a resin impregnation rate of 50%.
/cm" for 2 minutes in a hot press. The obtained cypress reinforcing material had a candy-colored appearance due to the resin and had no texture.

A sword that was dressed as a sword loga with a base.
Effect) As shown in the examples, the cypress reinforcing material according to the present invention uses a consolidated cypress veneer and is made by adding two water-soluble amino resins.
By impregnating the material by ~30%, the cypress material did not exhibit a candy color, had the texture of natural cypress material, was extremely hard, and did not swell in the thickness direction when absorbing moisture.

Claims (1)

[Claims] A water-soluble amino resin is impregnated into cypress wood that has been compacted to a compression ratio of 10 to 70% and cured, and the surface whiteness of the cypress wood after impregnation and curing is 25 to 25 (JISP-8123 standard).
50 and yellowness (JISK-5400 standard) 30-60
A cypress reinforcing material comprising 5 to 30% by weight of the impregnated water-soluble amino resin based on the resin solid content based on the cypress material.