JPH0369301A - Manufacture of plywood having flameproof and fire retardant property - Google Patents

Abstract

PURPOSE:To manufacture plywood having flameproof and fire retardant properties, by a method wherein at the time of regulation of a glue solution of an adhesive agent, a silicate is contained in the glue solution and the plywood is obtained by making use of the glue solution in which the silicate is contained. CONSTITUTION:Adhesion is performed by making use of a glue solution of an adhesive agent, especially the glue solution of a thermosetting resin adhesive agent, and plywood, especially that comprised by laminating and joining veneers or a laminated material of the veneers is manufactured. At the time of regulation of the glue solution of the adhesive agent, a silicate, especially a clay mineral is contained into the glue solution and the plywood is obtained by making use of the glue solution into which the silicate is contained. At the time of manufacturing of the plywood having flameproof and fire retardant properties by making use of a thermosetting resin adhesive agent such as especially urea or melamine or phenol, the silicate is contained into a compounding composition of the glue solution at the time of regulation of the glue solution. With this construction, the manufacturing of the plywood, which improves flame resistance and heat-resistance, decreases compounding quantities of the other flameproof and fire retardant agents, reduced a cost and having flameproof and fire-retardant capacity, is made possible and a ligneous fire-retardant material which does not spoil a merit of lumber can be obtained.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for manufacturing plywood having flame retardant and flame-retardant properties. , when looking at the breakdown of wooden houses, the use of external materials]Y
The demand for the two-by-four construction method, which is the first proposal, is increasing as the design and construction precisely meet the needs of the customers. In this construction method, plywood and TL board skin material (+,, V
L) is frequently used.

In addition, plywood and LVL as wooden interior materials are important materials for use in decorative baseboards.

On the other hand, there is a strong social demand for making wood flame retardant for the reason of flame retardancy. It is required to provide wood-based flame retardant materials without damaging them.

The flame retardant treatment of plywood can be roughly divided into ■ treatment of veneer and plywood, and ■ treatment by mixing adhesives. The former treatment (■) is mainly a plywood surface treatment, so it has problems with aesthetics and paintability. became a problem,
In addition, a separate process is required to manufacture the plywood.

Although the latter process (2) is the simplest method in terms of the plywood manufacturing process, it involves many problems.

In other words, by containing chemicals (flame retardants and flame retardants such as phosphoric acid, ammonium salts and guanidine salts of sulfamino acids, and alkali metal salts of boric acid), the viscosity of the adhesive liquid is reduced. This increases the size and interferes with the on-site gluing work at the plywood factory, and it is necessary to finish the gluing operation within a predetermined time (this is called the pot life of the size liquid).

Furthermore, the adhesion performance of flame-retardant plywood and flame-retardant plywood due to the presence of chemicals, especially water control strength, tends to decrease significantly.

The present invention aims to overcome the drawbacks of the prior art.

[Means for Solving the Problems] The present invention to achieve the above object is a method of laminating and bonding plywood, especially JII boards, by using an adhesive paste liquid, particularly a thermosetting resin adhesive paste liquid. In the method of manufacturing plywood or deck top layer material, in which the silicates, especially clay minerals, are not included in the glue sizing solution, The present invention relates to a method for producing plywood having flameproof and flame retardant properties, characterized in that the plywood is obtained using a size liquid containing AJ.

According to the present invention, when manufacturing plywood that has flame retardant performance using thermosetting resin adhesives such as urea-based, melamine-based, and phenol-based adhesives, it is possible to In the composition of the size solution, silicates (especially kaolin, which is a two-layered clay mineral consisting of a silicon tetrahedral layer and an aluminum hedral layer:
The composition of A1) improves inflammation and heat relieving properties, and the combination of other flame retardants and flame retardants! 1), it is possible to manufacture plywood having flame-retardant and flame-retardant properties at a reduced cost, and it is possible to provide a wood-based flame-retardant material without detracting from the advantages of wood.

In other words, as described in 1., when a general phosphoric acid-based flame retardant/flame retardant is included in an adhesive size liquid, the viscosity of the size liquid becomes large, which impedes workability. The pot life is also shortened, and it is necessary to complete the clamping operation within a predetermined time.

However, by including silicates (particularly kaolin) in this adhesive paste, flame resistance and heat resistance are improved, and even if the above-mentioned mulberry cutting content is reduced, flame resistance and heat resistance are improved. The flame retardant performance is not reduced, and the thickening properties and pot life of the paste are improved, and the adhesive workability is improved.

Furthermore, according to the general drug content as mentioned above.

However, as in the present invention, it reduces the adhesion performance of flame-retardant and flame-retardant plywood, and in particular causes a decrease in water resistance strength.
By incorporating engineered salts into the adhesive liquid, there is little deterioration in adhesion performance, reducing the π content of general chemicals, and improving flame retardant and flame retardant performance without reducing water strength. We can manufacture plywood products that believe in

The engineered salts used in the present invention have the general formula xMa
O・ySiOz (However, in the formula, x, ylj coefficient 9M
Examples include salts consisting of silicon dioxide and metal oxides represented by (metal atom) or salts similar thereto.

'F5 +￥i+ I

(?1) Kaolin: Hefuku 203 ・2 SiO□
・211□0(b) Halloysite +Aj2 zo*
・25iO241t20 (cl pyrophyllite: A
l1 an, l" 4 SiO□'1120 (d) Montmorillonite: AIl 2 (h'45i02'+120" n
1lzO(c) Cloud 1:j Preservation: K
, IO-3Aj2103'6 SiL" 21
120 (") Slime: 3M g 0
・4 S iL ・11201, Kiko [acid salts include kaolin (kaolinite) clay, bentonite, talc (talc), Ir: algae-L, sericite (silk);
It is commercially available as acid white 1-ni (contains activated clay), and is used for other purposes such as ceramic lumber.

The above kaolin M (+ stands for S!) A two-layer type (1:1
type) clay minerals; examples of kaolin are kaolinite, halloysite, metahalloysite, anoxide,
Examples include nakuranite, but generally kaolinite, halloysite, and metahalloysite are representative.

In article 1, halloysite is shown separately from kaolin angle.

Montmorillonite and the like are called 2:1-type or 3-clast type clay minerals because they have a circumference sandwiched between two Si41n1 layers to the Aj2 octahedral surface.

In the present invention, these clay minerals are Si -o -o
It is preferred to use a two-layer structure or a 37m structure consisting of a combination of tl scrap and a layer of Afi-0-11.

In the present invention, such silicates are contained in the adhesive layer to take advantage of their thermal properties, especially the fire resistance and barrier effect of silica and alumina components. Those having thermal properties are preferred.

Figure 1 shows thermal analysis curves obtained by differential thermal analysis of each type of clay mineral.

Considering the flame resistance and heat resistance of kaolin, which is a pure acid salt of clay minerals, as a representative example, its thermal properties can be inferred from the thermal analysis curve by differential thermal analysis shown in Figure 1. It shows a prominent endothermic reaction peak at about 600'C and a sharp exothermic reaction peak occurring at 980°C. The curve is caused by dehydration of 11YjQ water, and the latter is r-Aj2J of amorphous alumina, which is caused by the collapse of the kaolin case r due to dehydration.

It is thought that this is due to crystallization.

It is inferred that this endothermic reaction 1111 line causes the 1) flame/11 thermal effect to be exhibited.

In the present invention, it is particularly desirable to use kaolin, especially kaolinite.

That is, according to the studies of the present inventors, the adhesive layer barrier effect of other inorganic substances (calcium carbonate, antimony oxide, dolomite, sodium silicate) and kaolinite (kaolin clay) can be improved by adding adhesive to 12 mm plywood. 5
As a result of evaluating the tt flame penetration suppression ability by preparing the clay, kaolin clay showed the best flame penetration suppression performance.

Among the silicates of clay minerals, kaolin clay is relatively inexpensive and can be produced by hand, making it possible to produce inexpensive flame-retardant plywood without significantly increasing the unit price of adhesive.

Kaolin clay has a neutral pH value around 7, which makes it highly compatible with thermosetting resin adhesives (area-based, melamine-based, and phenol-based), and is also compatible with other agents. Can be used in combination with

By using this kaolin clay and a chemical in combination, even if the chemical content is reduced, the adhesive workability and adhesive strength of 11 water can be improved as described above. It becomes possible.

An example of kaolin clay is shown below.

KaobriLe (KaobriLe) [Product name] A coating pigment consisting of 80% or more of fine particles of 2μ or less, which is easier to handle as a powder than a dry powder finished with a spray dryer, and It is easy to prepare high concentration slurry and shows excellent fluidity.

The chemical properties of Kaobrit,e are as follows.

Chemical analysis method SiO % 44.8-45.8 Afl, O, 1
% 37.5-397FellO,, % 0.
3]゛IO□% 135-227g, I, oss
% 13.7-14.1 The physical properties of Kaobri Le are as follows.

Water (%) D or less Whiteness % 86. .

Whiteness 16.4 pH 7.0 Index ratio 'lx 2.5B Refractive index
1.55 suction nt g/l OJ 37.
2 The present invention can be widely applied to the production of wood products with flame retardant and flame retardant properties using adhesives, but in particular, it can be applied to the production of wood products with flame retardant properties using adhesives. Plywood and funeral board treetop layer materials! ! ! This is effective when building a J.

[Example] Next, the present invention will be explained with reference to Examples.
The present invention is not limited in any way by these examples.

Example 1 To 100 parts of area resin adhesive (product number Jinketsu Resin No. 210), 17 parts of wheat flour (Akahana Seal) and kaolinite clay (
Mix and dissolve 13 parts of K
A viscous glue solution is prepared, and 100 parts of water is further mixed therein to adjust the viscosity of the glue solution to 15 to 25 voids, and then 0.3 parts of a curing agent (ammonium chloride powder) is mixed to form an adhesive composition. And so.

Using the paste mixture thus obtained, plywood having flame retardant properties was produced under the following working conditions. Its adhesion performance and flame retardant performance were measured by the following test methods.

(1) Working conditions Application method: Application with rubber roll a) Creation of 3 m/m plywood 1! Composition of 1 board: 22 ? Ak 0175m/n+thickness veneer 1.70m/m thickness lit board water-containing skewer:〃7～
8% 〃 8-9% Printing: 3 Bry coated: :'r 0g7900cm” Composite time: 215
Minutes/25℃ Cold sweat: 20 minutes X I OKg/cm' Heat 1
1": 115℃ x 8 Kg/cm" x 60 seconds Tl) 4 m/m plywood creation Veneer lamination: Front and back plates 0.75 m/m Thickness veneer 2.55 m
Moisture content of /m thick veneer:〃 7~8%〃 6~7%
Composition = 3 fly coating: 32 g/900cm” Composting time: 15 minutes/25℃ 伶 Pressure: 20 minutes X I OKg/cm2 Heat pressure: 1I5
℃X 8 Kg/cm2 A sex test was conducted.

The results are shown in Table 1.

Example 2 In the same manner as in Example 1, 100 parts of area resin adhesive was added.
10 parts of wheat flour and kaolinite clay (KAOBR11)
'E,) 13 parts are mixed and dissolved to make a viscous paste liquid, and then 122 parts of a flame retardant (OK-26, trade name) are mixed and dissolved, and 5 parts of water are mixed to make a tliil liquid viscosity of 15. The adhesive composition was adjusted to ~25 voids, and 2.5 parts of melamine powder was mixed and dissolved.

Similar to Example 1, 3 m/m plywood and 4 m/m
Adhesion work was performed under plywood working conditions, and the adhesive performance and flame retardant performance were tested.

The results are shown in Table 1.

Example 3゜Same as Example 1, area resin adhesive (product number 210)
Mix and dissolve 17 parts of wheat flour and 13 parts of kaolinite clay (KAOBRI 'l°E) into a total of 100 parts of adhesive (50 parts of melamine resin adhesive (product number M-33)) to create a sticky adhesive. A viscous size liquid was prepared, and 100 parts of water was further mixed therein to adjust the viscosity of the size liquid to 15 to 25 viscosity, and then 0.3 parts of a curing agent (Ammonium Chloride Takusong) was mixed to form an adhesive composition. did.

The formulation f! obtained in this way! 3 m/m and 4 m/m flame-retardant plywood were prepared using illumination solution under the working conditions of Example 1, and the adhesion performance and flame-retardant performance of the flame-retardant plywood were evaluated.
A test was conducted based on the agricultural and forestry standards.

The results are shown in Table 2.

Example 4 In the same manner as in Example 2, area resin adhesive (product 1ft2
10) and 50 parts of melamine resin adhesive (product number M-33) for a total of 100 parts of adhesive, 10 parts of wheat flour, and kaolinite clay (KAo 13 Rl"r"1-
) 13 parts to make a viscous paste liquid, further mix and dissolve 12 parts of flame retardant (OK-26), then mix 5 parts of water to make the paste viscosity 15 to 25 boids. Then, 2.5 parts of melamine powder was mixed and dissolved to obtain an adhesive composition.

Similar to Example 1, 3 m/m plywood and 4 m/m
The adhesive work and flame retardant performance were tested under the working conditions of plywood.

The results are shown in Table 2.

Comparative example 1. ~6 Plywood was prepared in the same manner as in Example 1, except that an adhesive composition having the composition shown in Table 1 was used, and the adhesive performance and flame retardant performance were similarly tested.

The results are shown in Tables 1 and 2.

Table 1 [Effects of the Invention] As described above, according to the present invention, the thickening property of the adhesive-containing size liquid is improved, and the lamination work is facilitated.

Nevertheless, it was possible to provide a flame-retardant and flame-retardant adhesive paste liquid that can prevent low F in adhesive performance.

In particular, the adhesive formulation composition according to the present invention contains 1;
This makes it possible to reduce the length of the eaves, and reduces flame retardant and flammable VV performance, thereby improving work efficiency.

By the way, in recent years, various shrines have been held in various local cities in Japan, and the temporary wings have been made of flame-retardant plywood and flame-retardant plywood as stipulated by the Fire Service Act.

However, with the adhesive formulation composition according to the invention.

By manufacturing flame laminated plywood and flame retardant plywood, it becomes possible to provide inexpensive plywood.

[Brief explanation of drawings]

Figure 1 is a representative differential thermal analysis 111 (line graph) of various clay minerals. Curve 1 is kaolinite, 2 is dateskite, 3 is nacrite, 4 is hydrated halloysite, 5 is pyrophyllite,
6 is pyrophyllite, 7 is montmorillonite, 8 is montmorillonite, 9 is illite, and 10 is sericite.

Claims (1)

[Scope of Claims] 1. A method for manufacturing processed wood materials such as plywood, laminated veneer materials, or laminated wood (hereinafter referred to as plywood) by bonding using an adhesive paste, Manufacture of plywood having flame retardant and flame retardant properties, characterized in that silicates are contained in the size liquid during preparation of the liquid, and plywood is obtained using the size liquid containing the silicates. Method. 2. The plywood having flame retardant performance according to claim 1, wherein the silicate is a clay mineral, and is a two-layer clay mineral or a three-layer clay mineral consisting of a silicon tetrahedral layer and an aluminum octahedral layer. manufacturing method. 3. The method for producing plywood having flame retardant properties according to claim 1, wherein the plywood is a plywood formed by laminating and bonding veneers or a laminate of veneers.