JPH02253902A - Method of painting flameproofing lumber - Google Patents

Abstract

PURPOSE:To make the adherence of a painted film and the lumber extremely excellent, and obtain a flameproofing lumber with an excellent fire resisting property by painting in use of a high polymer polysiloxiane resin painting material with respect to a specific flameproofing lumber. CONSTITUTION:A flameproofing lumber employed herein is of a type that a lumber classified as an araucaria cedar is being infiltrated with a partially reactive product material of dicyandiamide, phosphoric acid, boric acid, and water by 100kg or more per lumber of 1m<3> at a solid quantity. The surface of the flameproofing lumber is subjected to painting by the use of polysiloxiane. The high polymer polysiloxiane resin painting material is of a type containing curable high polymer polysiloxane resin as a required component, to which tertiary (phenol derivative) or the like is blended as a curing catalyst, and further, a coloring agent, vehicle, filler, and others are mixed therewith as required.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method of painting flame-retardant wood, and in particular, by using a high-molecular-weight polysiloxane resin paint, it can be applied to flame-retardant wood without impairing its appearance. Improves adhesion with paint,
Furthermore, it is possible to obtain flame-retardant wood with excellent fire resistance and safety.

[Conventional technology] Conventionally, when painting flame-retardant wood, water glass-based paints,
Paints such as polyvinyl chloride, epoxy resin paints, halogen-containing polyurethane, and phosphorus-containing polyurethane were mainly used.

[Problems to be Solved by the Invention] However, when flame retardant wood is painted using the above-mentioned paint, there is a drawback that adhesion to the wood is poor because the wood is impregnated with a large amount of flame retardant. There were also drawbacks in terms of work, such as the paint not drying quickly. Furthermore, with most of the above-mentioned paints, it is impossible to paint transparently, and even with transparent paints, it is not possible to paint with a rich wood-like appearance that takes advantage of the unique texture of wood. Ta.

Furthermore, when a paint such as the above-mentioned halogen-containing polyurethane is used, it also has drawbacks in terms of safety, such as the generation of toxic gas when burned.

Therefore, the present invention solves the above-mentioned problems, and produces m-formed wood that has good adhesion to wood, high quick drying properties, fire resistance, and safety without impairing the appearance of the wood. Its purpose is to provide a coating method.

[Ninth Means for Solving the Problems] The present invention is made by impregnating wood of the family Araceae with a partial reaction product of dicyandiamide, phosphoric acid, boric acid, and water in a solid content of 9 to 100 per m" of wood. The solution was to paint flame-retardant wood with a high-molecular polysiloxane resin paint.

The present invention will be explained in detail below.

The flame retardant wood used in the present invention is a wood belonging to the family Araceae, in which a partial reaction product of dicyandiamide, phosphoric acid, boric acid and water is added at a solid content of 100% per 13 liters of wood.
It is impregnated with Jcy or more. Agathis is a general term for wood belonging to the family Agathis, such as agathis, agathis, and almaciga, but agathis is preferred because it can be impregnated with a large amount of flame retardant and there is no local variation in the impregnated state or impregnated concentration. The partial reaction product of dicyandiamide, phosphoric acid, boric acid and water is a flame retardant described in JP-A-57-70178. This mainly consists of guanylurea phosphate produced by the reaction of dicyandiamide with phosphoric acid, the guanylurea phosphate-boric acid product produced by the reaction of this guanylurea phosphate with boric acid, and the unreacted guanylurea-boric acid product. It contains dicyandiamide, phosphoric acid, boric acid, etc., and is prepared as an aqueous solution with a concentration of 20%, for example, but the concentration is not limited thereto. The partial reaction products of dicyandiamide, phosphoric acid, boric acid, and water are contained in the wood of the Araceae family in the solid content! It is impregnated with a solution of 100 & 9 or more per 1 m3 of wood, resulting in particularly high flame retardancy, exceeding the test standard value for "semi-noncombustible materials" stipulated in Ministry of Construction Notification No. 1231, and being evenly impregnated. Impregnation of 500 & 9 or more is preferred.

If it is less than 100&9, the effect of improving the flame retardance of wood cannot be sufficiently obtained, which is not preferable.

The surface of this flame-retardant wood is coated with a high-molecular polysiloxane resin paint.

High-molecular polysiloxane resin-based paints contain a curing type high-molecular polysiloxane resin as an essential component, and add tertiary amines (phenol derivatives) etc. as a curing catalyst to this, and add color if necessary. It is made by mixing agents, vehicles, fillers, etc. Examples of high-molecular polysiloxane resins include those represented by the general formula (where Et represents an ethyl group), but are not limited to these and have a siloxane bond in the main chain The amount of high molecular weight polysiloxane sesame is as follows:
Including the above-mentioned curing catalyst, the nonvolatile content is preferably about 25 to 40% by weight from the viewpoint of workability, quick drying, etc.

The colorant is not particularly limited, but dye-based colorants such as organic metal-containing dyes, pigment-based colorants such as titanium white, carbon black, azo red, azo yellow, and amber are preferably used, and the combination thereof The amount is appropriately determined depending on the desired coating color. As the vehicle, lacquer clear, copal varnish, various solvents, synthetic resin varnish, etc. can be used, but it is preferable to use a highly volatile vehicle in terms of quick drying properties.

Use of an organic vehicle is not preferable because the paint may suffer from poor curing. Furthermore, various fillers may be added as appropriate. For example, if a wood with a matte surface is desired, the desired matte surface can be obtained by adding transparent pigments such as mica fine particles, magnesium carbonate, and alumina white.

This high-molecular polysiloxane resin paint is applied to the surface of the flame-retardant wood described above. Prior to application, it is preferable to perform substrate preparation 9 in order to improve the adhesion between the paint and the wood. Preferably, the substrate is prepared by means such as #320 vapor, dry sanding, wet sanding, etc.

It is also recommended to further apply a primer coat and dry; in this case,
As the undercoat, the above-mentioned high-molecular polysiloxane resin paint or organic paint such as polyurethane may be applied by various methods such as a roll coater, a flow coater, or a brush coater.

Further, drying may be carried out by leaving it for 4 to 16 hours at a temperature of 100° C. or lower, preferably around room temperature, and then grinding may be carried out again. This undercoating and subsequent grinding provide the advantage of improving the adhesion between the high-molecular polysiloxane resin paint applied in a subsequent step and the wood.

The method of topcoating the polymeric polysiloxane resin paint is not particularly limited, but methods such as roll coater, flow coater, and brush coating are preferred. It is applied to a thickness of about 100 μm.

Next, the coating film made of this polymeric siloxane resin paint is dried. Drying should be carried out under conditions that do not cause deformation of the wood. Drying is carried out by leaving it at a temperature of 100°C or less, preferably around room temperature, for 4 to 16 hours.
Other methods may also be used.

According to this method, even though the wood is impregnated with a large amount of flame retardant, it is possible to obtain flame-retardant wood that has excellent adhesion between the coating film and the wood and has good heat resistance. It will be done. Furthermore, this polymeric polysiloxane resin paint film has good quick drying properties and can be sufficiently dried even at low temperatures of 100° C. or lower, so there is no operational inconvenience such as deformation of the wood during drying. It also has the advantage of safety, as no toxic gas is emitted during combustion. Moreover, according to this coating method, the unique appearance of the wood is not impaired, so the wood has a rich woody feel and is suitable for use in various building materials.

[Example] Flame retardant wood was painted according to the method described below. As the flame-retardant wood, a flame-retardant wood obtained by impregnating Agatis (Arachiaceae) with the flame retardant described in the above-mentioned Japanese Patent Application Laid-Open No. 57-70178 at a solid content of 100 ky was used. Prior to painting, the base was prepared, ground with #320 paper, and then undercoated and dried. A high molecular weight polysiloxane resin paint was used for the undercoat. Also, leave it to dry at 25℃ for 4 hours.
This was done by grinding and then grinding. Grinding is #32
The experiment was conducted using 0 vapor.

Finally, a high-molecular polysiloxane resin paint was applied as a top coat to the surface of the flame-retardant wood after being undercoated by a spray method. High-molecular polysiloxane resin-based paints contain a phenol derivative of tertiary amine as a curing catalyst in the high-molecular polysiloxane represented by the general formula (1) above, and then mica as a coloring agent and matting agent. A high-molecular polysiloxane resin paint containing powder was used. Two coats were applied and allowed to stand at 25°C for 2 hours as a setting time. The coating thickness was 50 μm.

Next, this coating film was dried at 25° C. for 6 hours to obtain a flame-retardant wood of an example.

In addition, compared to this, water glass, VV vinyl chloride, epoxy resin paint, halogen-containing polyurethane, and two-component polyurethane, which is commonly used as a general paint, are used as fire prevention paints. Painting was carried out in the same manner as in the example.

The appearance, adhesion, safety, quick-drying properties of the resulting flame-retardant wood,
Evaluations of various physical properties such as durability, and tests (surface test, perforation test) for quasi-noncombustible material J specified in Ministry of Construction Notification No. 1231 and No. 1372 were conducted, and the results are summarized in Table 1.

(Hereinafter referred to as margins) As is clear from Table 1, the wood obtained by the coating method using the polymeric polysiloxane resin paint of the example has poor appearance, adhesion, safety, quick-drying properties, and durability. All evaluations were good, moreover, the test standard values for "quasi-noncombustible materials" were exceeded, and a flame-retardant wood that was comprehensively excellent as specified in Ministry of Construction Notification No. 1231 was obtained. Compared to this, Comparative Examples 1 to 5 were painted using conventionally used paints.
However, it was not possible to obtain flame-retardant wood that was excellent overall.

[Effects of the Invention] As explained above, the present invention applies partial reaction products of dicyandiamide, phosphoric acid, boric acid, and water to wood belonging to the Araucaceae family in a solid content of wood 1. ! Since the flame retardant wood impregnated with 100J9 or more is coated with a high-molecular polysiloxane resin paint, even though the wood is impregnated with a large amount of flame retardant, Flame-retardant wood with excellent adhesion between the paint film and wood and good fire resistance can be obtained. In addition, this high-molecular polysiloxane resin paint film has the advantage of workability, such as quick-drying properties, and also has the advantage of safety, such as extremely high heat resistance and no generation of toxic gas even during combustion. be. Moreover, according to this coating method, the unique appearance of the wood is not impaired, so the wood has a rich woody feel and is suitable for use in various building materials.

Claims (1)

[Claims] Araucaceae wood contains dicyandiamide, phosphoric acid,
The partial reaction product of boric acid and water is added to the solid content of 1 m of wood.
A method for coating flame-retardant wood, which is characterized in that 100 kg or more of flame-retardant wood is impregnated per ^3 with a high-molecular polysiloxane resin paint.