JPH02187303A - Manufacture of improved organic board - Google Patents

Abstract

PURPOSE:To enhance fireproof performance without damaging the properties of an organic board by fixing a nonflammable material composed of organic substances in cell pores and/or in an inner wall surface, using fibers to which the noflammable material is fixed or adhered for outer peripheral sections of organic fibers and performing integral molding by means of a bonding material. CONSTITUTION:Organic fibers are immersed in water until becoming in the saturated state, and then impregnated with a water solution of a water soluble inorganic material. Then, an organic compound is fixed or adhered to the inside cell pores and/or to outer peripheral sections of fibers by reacting said fibers with compound liquid reacting with said inorganic material and composing a water insoluble inorganic compound. Then, a bonding agent composed of one or a plurality of thermoset resin such as urea resin, melamine resin or phenol resin, a thermoplastic bonding agent such as vinyl acetate or rubber resin is added to modified organic fibers thus manufactured. The water content is adjusted, and then a mat is foamed and clamped or heat clamped under the curing condition of the bonding agent to form an improved organic board.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a method for producing an improved organic board formed using 8i fibers having non-combustible properties.

[Prior art and its problems 1 There is a known technology for making wood sticks, boards, or veneers flame-retardant by dispersing and fixing nonflammable inorganic compounds in the internal pores of the cells inherent in the wood (Japanese Patent Laid-Open No. 61-244502). ).

However, in the state of wood sticks, boards, or veneers, the amount of noncombustible inorganic compounds in the wood is 40% based on the absolute dry weight of the wood.
In order to disperse more than % by weight, depending on the size of the cross-sectional shape, impregnation cannot be achieved unless it is immersed in a solution containing a nonflammable inorganic compound for a long time, and a large amount is impregnated in the surrounding area. Uniform dispersion to the interior was difficult. Furthermore, powdered nonflammable inorganic compounds adhere to the outer periphery of the wood and have poor cosmetic properties, so they cannot be used as is and must be removed by washing with water.However, the removed nonflammable inorganic compounds cannot be recovered. This method has problems such as being difficult and uneconomical and requiring a waste liquid treatment process.

Means for Solving the L Problems] In view of the current situation, the present inventors have developed an inexpensive improvement method using an improved organic fiber that provides nonflammable properties and fixes noncombustible substances economically in a short period of time. As a result of extensive research in order to provide an organic board, we have completed the present invention.

That is, the present invention fixes a nonflammable substance made of an inorganic substance into the cell pores and/or the inner wall surface of an organic fiber having cell pores, and also fixes the nonflammable substance to the outer periphery of the organic fiber. Alternatively, this is a method for producing an improved organic board, characterized in that the fibers that are attached are used and integrally molded with an adhesive substance.

The organic fibers having cell pores used in the method of the present invention are made by chipping softwood materials such as pine, cedar, and cypress, or hardwood materials such as lauan, capor, chestnut, and poplar, and then defibrating them according to a conventional method. The length of the fiber is 1 to 30+sm,
The majority are about 2 to 300 microns in diameter. This fiber has several to several cell pores consisting of wood cells and conduit pores.
They look like dozens of bundles of water, and the cell walls around the fibers are often torn or cracked.

In the method of the present invention, first, a nonflammable substance made of an inorganic substance is layered or filled in the voids such as cell pores and conduit pores of such organic fibers so as to cover the pore walls, and the fibers An improved organic fiber having fire retardant properties is obtained by attaching a nonflammable inorganic substance to the outer periphery of the (cell bundle) either by self-cutting or by adhering with an adhesive or the like.

At this time, the weight ratio of the incombustible compound made of inorganic substances to the weight ratio of the organic fibers needs to be 33% by weight or more. If it is less than 33% by weight, the fire retardant performance is insufficient and is not preferable, and the improved organic board obtained by the present invention is uniformly composed of the improved organic fibers having fire retardant performance. Fire protection performance equivalent to that of the prior art can be obtained even if the weight percentage is higher than that of the conventional technology.

Examples of nonflammable inorganic substances used in the method of the present invention include calcium compounds, magnesium compounds, aluminum compounds, and barium compounds.

Examples include lead compounds, zinc compounds, silicic acid compounds, and cement.

To produce an improved organic board according to the method of the invention,
First, in order to uniformly disperse a nonflammable inorganic substance into an organic fiber having cell pores, the organic fiber is immersed in water until saturated, then impregnated with an aqueous solution of a water-temperature inorganic substance, and then The inorganic compound is fixed or adhered to the inside of the cell pores and/or the outer periphery of the fiber by reacting with a compound liquid that reacts to produce a water-insoluble inorganic compound.

The improved organic fiber thus obtained includes, for example.

Thermosetting adhesives such as urea resin, melamine resin, phenolic resin, etc., thermosetting adhesives such as vinyl acetate resin, rubber resin, and two-component reactive resin.

An improved organic board is produced by adding a single or multiple adhesive such as a moisture-curing resin, adjusting the moisture content, forming the mat, and pressing or heat pressing depending on the curing conditions of the adhesive. be able to.

The adhesive used at this time is preferably one with good permeability.
Care must be taken to ensure that the adhesion strength is not reduced by the incombustible inorganic compound that adheres or adheres to the surface of the improved organic fiber. Further, it is preferable to add a flame retardant to the adhesive or to use an adhesive that has been made flame retardant in advance.

[Effects] The improved organic board produced by the method of the present invention can improve fire protection performance without impairing the characteristics of the organic board, and furthermore, compared to processing rods or plates from the beginning, Since the fibers are improved before being made into boards, the process can be completed in a short time.

Moreover, since uniform dispersion treatment can be performed, the added amount of the incombustible inorganic substance can have at least the same fire prevention performance as that of the conventional method, and thus has an economical and excellent effect.

[Example] Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 Radiata pine chips at 170'C, 7kg/c+
After steaming for 3 minutes at 100 m'', the water-saturated fibers defibrated using a defibrator refiner were immediately immersed in an aqueous solution containing barium chloride as the main component for 15 minutes, and then soaked in an aqueous solution containing barium chloride as the main component. By immersing the wood fibers in the aqueous solution for 15 minutes, a nonflammable inorganic compound consisting of water-insoluble barium phosphate and barium hydrogen phosphate is produced in the cell pores and other pores of the wood fibers. After the product of the inorganic compound is also fixed on the outer peripheral part.

It was dried in a hot air drying oven at 130°C to obtain an improved organic fiber. At this time, the rate of increase in the amount of balls due to the product was 38%.

Using the improved organic fiber, a board was obtained by adding 4% of a melamine resin adhesive containing ammonium phosphate and hot pressing at 140° C. for 3 minutes.

Using this board, we conducted a quasi-nonflammability test according to JIS, and it passed.

Claims (1)

[Scope of Claims] 1) A nonflammable substance made of an inorganic substance is fixed to the cell pores and/or the inner wall surface of an organic fiber having cell pores, and the nonflammable substance is also fixed to the outer periphery of the organic fiber. 1. A method for producing an improved organic board, which comprises using fibers to which an adhesive substance is fixed or adhered, and integrally molding the fibers with an adhesive substance. 2) The method for manufacturing an improved organic board according to claim 1, wherein the incombustible inorganic substance is added in an amount of 33% by weight or more based on the absolute dry weight of the improved organic board.