JP3347465B2 - Method for producing flame-retardant wood board and adhesive composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flameproof and flame retardant particle board, MDF (Medium density fiber-board).
The present invention relates to an adhesive used in the production of wood boards.

[0002]

2. Description of the Related Art Wood boards such as particle board and MDF are obtained by mechanically crushing or cutting wood materials (small-diameter wood, sawdust, veneer scraps, and other waste materials) and sorting them into small pieces (chips) or wood fiber materials. It is manufactured by a method of drying and then applying a uniform adhesive by spraying an adhesive thereto, followed by heat compression molding. Recently, IJS-A-1322 (flame retardancy test of thin building materials) has been examined. In addition, those having the flameproof performance specified in the fire enforcement order have been required. Conventionally, in order to make this particle board etc. flameproof and flame retardant, first add ammonium phosphate, boric acid, ammonium sulfamate etc. as a flameproofing additive to the raw material chip material, dry it, and then apply an adhesive. It is manufactured by a method of heat molding to a predetermined thickness and density, or a method of impregnating and applying the above flame retardant and flame retardant to the board surface subjected to heat compression molding.

[0003]

However, in the conventional method, the production process is complicated and the cost is increased. In the method of impregnating and applying a flame retardant and a flame retardant to the molded board surface, the secondary processing of the board is applied. However, there is a disadvantage that the surface properties at the time of printing and overlaying are hindered.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies on the above problems, and as a result, have developed an adhesive which can be used without changing the conventional process for manufacturing a wooden board and which can obtain a flameproof performance. Thus, the present invention has been completed.

That is, the method for producing a flame-retardant wooden board and the adhesive composition of the present invention are based on 100 parts by weight of an adhesive composition comprising an amino resin such as a urea resin or a urea-melamine resin, and a mixture of ammonium primary phosphate and / or Alternatively, an adhesive composition containing 1 to 7 parts by weight of ammonium diphosphate and 3 to 18 parts by weight of a mixture of alumina fine particles containing 10 to 60% by weight of melamine and / or melamine isomer is used as a wood chip or wood fiber. After applying and impregnating the material, the material is subjected to heat compression molding.

In the adhesive composition of the present invention, ammonium primary phosphate and secondary ammonium phosphate, particularly, ammonium secondary phosphate have good solubility and other properties, and can be used advantageously. It also acts as a curing agent for the adhesive, but by adding a mixture of alumina fine particles containing melamine and melamine isomers, the flame resistance and flame retardancy are improved, and the primary ammonium phosphate, secondary ammonium phosphate,
Ammonium phosphate can be added in a relatively low amount, contributes to improvement in adhesiveness and water resistance, prevents early curing and gelation of the adhesive, stabilizes the adhesive application process as a stable compounded adhesive, and improves uniformity. The coating operation can be performed, and high-quality flame-proof and flame-retardant particle boards and MDF can be manufactured in the next hot press process. It should be noted that although conventional curing catalysts such as aluminum hydroxide and ammonium chloride are appropriately added, the amount used can be reduced.

As the alumina fine particle mixture in the adhesive composition of the present invention, for example, a recovery catalyst produced as a by-product from a urea melamine production plant can be suitably used. This is obtained by sieving the alumina catalyst recovered in the urea-method melamine. The amounts of melamine and melamine isomers contained are 2 to 15% by weight of melamine and 5 to 4 of melam.
0% and about 1 to 10% of Melem, and this component ratio does not require much strictness. The particle size of the fine particles is preferably 50 μm or less.

The amount of the alumina fine particle mixture is preferably 3 to 18 parts by weight with respect to 100 parts by weight of the urea resin and the urea-melamine resin.
If the amount exceeds the weight part, the viscosity as an adhesive increases, and the workability decreases. The amount of melamine and melamine isomer in the mixture of alumina fine particles is 10 to 60% by weight. If the amount is less than 10% by weight, the flame retardancy is insufficient as described above. If the amount exceeds 60% by weight, the viscosity becomes high. Workability deteriorates.

In the case of producing a flame-retardant particle board by the method of the present invention, a step of adding a flame-retardant additive to a raw material chip material as in the conventional method of producing a flame-retardant particle board, coating and drying, and a step of forming a molded board surface There is no need for a step of impregnating and applying a flame retardant, and only the use of the adhesive of the present invention in the step of manufacturing a conventional ordinary particle board requires no change in the step.

[0010]

The present invention will be described more specifically with reference to the following examples.

Examples 1 to 8 First, wood chips (small-diameter wood, sawdust, board scraps, waste materials) were crushed and cut, and the selected chips were dried by a dryer. Spray coating of the adhesive of the invention, heat compression molding to produce particle board, flameproof,
Flame retardancy and board properties were tested. Table 1 shows the results.

The particle board molding conditions are as follows.

Plate thickness: 5 mm Density: 0.76 g / cm ³ Resin spray amount: 12% by weight Heat compression temperature: 160 ° C. Heat compression time: 120 seconds Compression pressure: 28 kg / cm ²

[0014]

[Table 1]

[0015]

According to the method for manufacturing a flame-retardant wood board of the present invention, JIS-A-1322 can be viewed as it is without changing the conventional ordinary particle board manufacturing process.
In addition, it is possible to easily manufacture a flame-retardant particle board that passes the standard flame-proof test of Article 4-3 of the Fire Service Law. Moreover, it does not hinder the secondary workability of the board when impregnating and applying a flame retardant and a flame retardant to the surface of a conventional particle board, and it can be made to have the same strength as a normal board in terms of strength. Further, the amount of formaldehyde emission is small, and it can be used for interior materials and furniture materials.

Continuation of the front page (72) Den Matsuura 1-6-6 Takasago, Takaishi-shi, Osaka, Japan Mitsui East Pressure Chemical Co., Ltd. (72) Inventor Kosuke Hamasaki 1-6 Takasago, Takaishi-shi, Osaka Mitsui East Pressure Chemical Co., Ltd. (56) References JP-A-52-117353 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B27N 3/00 B27K 3/52 BBC B27N 3/08

Claims (3)

(57) [Claims] The present invention relates to an adhesive composition comprising an amino resin such as a urea resin or a urea-melamine resin.
To 7 parts by weight and a mixture of fine alumina particles containing 10 to 60% by weight of melamine and / or melamine isomers 3 to
A method for producing a flame-retardant wood board, comprising applying and impregnating a wood chip or wood fiber material with an adhesive composition containing 15 parts by weight, followed by heat compression molding. 2. Ammonium primary phosphate and / or ammonium secondary phosphate are added to 100 parts by weight of an adhesive composition comprising an amino resin such as a urea resin or a urea-melamine resin.
To 7 parts by weight and a mixture of fine alumina particles containing 10 to 60% by weight of melamine and / or melamine isomers 3 to
An adhesive composition for flame-retardant wooden boards containing 15 parts by weight. 3. The adhesive composition for a flame-retardant wood board according to claim 2, wherein the alumina fine-particle mixture is a fine-powder recovery catalyst by-produced in the urea-method melamine production process.