JPS5811575A - Water-resistant adhesive - Google Patents

Abstract

PURPOSE:The titled adhesive useful for bonding wood, etc., having improved water resistance, obtained by blending an aqueous solution of a water-soluble synthetic high polymer with a dialdehyde residue-containing polysaccharide, etc. and an isocyanate compound. CONSTITUTION:1-50pts.wt., preferably 1-30pts.wt. polysaccharide (e.g., starch, etc.) wherein 50-100wt% glucose unit group is inverted into dialdehyde unit group and 1-30pts.wt., preferably 1-10pts.wt. isocyanate compound (e.g., diphenylmethane diisocyanate, etc.) are added to 100pts.wt. 1-30wt% aqueous solution of water-soluble synthetic high polymer (e.g., polyvinyl alcohol, etc.) with stirring, and uniformly dispersed into the solution, to give the desired adhesive composition. EFFECT:Since the amount of the isocyanate compound added is a small amount, no adhesion to hot board during heat pressing will occur.

Description

Detailed Description of the Invention The present invention relates to an adhesive with excellent water resistance, and provides an adhesive particularly suitable for 11 layers of wood and paper. Formalin-based 1lj11 such as Zria Judama, Meku ζn Judama, Phenol 411 Teng, and Resolkutsu ni Ju- are often used.

These kM phosphorus-based tree detoxifiers contain unreacted formalde, which evaporates into the atmosphere and causes I11 jobs. If you give it too much, it may cause irritation to your skin, etc., which may lead to suspension.

Therefore, we decided to use an IITW agent that does not use formali, such as a copolymerized pus** agent of isobutylene and maleic anhydride, and a water-based vinyl urethane IM! The adhesive etc. are squared, and these ** agents are ll! It is used.

However, these adhesives are more expensive than Nisu-Ajudama II-4 (and also have good film-forming properties, so the adhesive layer tends to dry out and cause flaking). , use 11
1 has drawbacks such as the need for strict adhesive bonding conditions, so it has not been commercialized until it is widely used.

41, the water-based PJWK 17g layer agent has good R'IQ properties with metals, so there is a threshold 1 such as layering on the hot plate during hot pressing, so it is difficult to put it into practical use. The tournament has become a major obstacle.

The water-based vinyl urethane adhesive is made by adding an isocyanate compound to water containing polyvinyl alcohol and water-based Cutex, and from this, the incyanate group is added to the water containing polyvinyl alcohol and water-based Cutex. It is said that water resistance is improved because it reacts with hydroxyl groups to form Creta-yellow-like structures and takes on a hollow structure.

However, *IIK shows that even if polyvinyl alcohol is not present, if the isocyanate compound 1 is uniformly distributed, the same water-resistant adhesion can be obtained.
It is believed that polyvinyl alcohol only plays the role of an emulsifier for uniformly dividing the isocyanate.

In addition, in the presence of water, the incyanate reacts with water to form a cm compound, and further, the urea reacts with the isocyanate to form a vinylet-like structure, forming a monomer structure. To go.

Therefore, since the isocyanate compound 1 has a high reaction ratio with water, it is necessary to add a large amount of Km in order to cause the inocyanate compound to react with polyvinyl alcohol.

However, when the amount of isono-compound added is increased, the Km layer agent leaches out when the pressure is sensitive to the trowel used to dramatically create the plate, etc. [It becomes easier to adhere to the hot plate, and as a result, the workability is reduced. It will drop slowly.

Adhesion to the hot plate can be achieved by applying an in7anate compound, but if an isocyanate compound is added, the dovetail reaction does not proceed sufficiently, resulting in a satisfactory water-resistant adhesive layer. Performance cannot be obtained.

The inventors have proposed a number of ways to resolve such contradictions.
I've researched a lot, and there are 50 to 100 units.
By blending the polysaccharide with % converted to dialdehyde units, the ino7anate compound can be converted into polysaccharide.
*JEL SE has discovered that it is possible to obtain a sheet with excellent water resistance and adhesion properties.

That is, the present invention provides a water-based compound containing water-based JiKA molecules.
Water resistance achieved by blending bosuga natucapide in which 50 to 10 units of the dulcose unit group are converted into dialdehyde units and/or its conductor and an inocyanate compound or an inocyanate polymer. By cutting the hydroxyl group of polyvinyl alcohol and inocyanate group, the reaction of the hydroxyl group of polysaccharide and isocyanate group, the crosslinking reaction of the hydroxyl group of polyvinyl alcohol and porcelain and aldehyde group, and furthermore The reaction between the inocyanate group and the aldehyde group, which is generated by the reaction of the inocyanate group with water, causes a parallel Km reaction, which results in excellent water-resistant mounting performance.

Therefore, the advanced drug of the present invention is suitable for the first part of the isocyanation process.
The amount of 1iJII may be small, and therefore adhesion to island mold during positive pressure can be eliminated.

As the water *a association^ molecules used in the superior layer agent of the present invention, polyvinyl alcohol and/or one conductor thereof is M
Adjacent to -1, WK3iI is also preferable in that it is easy to obtain many crystalline products, but it is far more preferable to use polyacrylic acid, polyacrylic acid, or its alkali salts, polyvinylpyrrolidone, polyethyleneimine, Water bathing molecules such as a copolymer of α-V fin and maleic anhydride or alkali salts thereof can also be used, and 24 or more knitted molecules selected from them may also be used.

In addition, the polysaccharide used in the present invention refers to the primary hydroxyl required for one reaction, so it may be any conventionally used polysaccharide, but it may be any polysaccharide that is commonly used. As for things, 54 rokoshi,
Horse-IF, f#ai, #flour obtained from sources such as wheat, rice, sago, tapioca, turgid gum, etc., natural gums such as gum arabic, tragaca/togum, guar gum, locust bean gum, etc.; There are polymers of 211 or more selected from cellulose, dextrin, algin, and inulin.

In addition, polysaccharide in which 50 to 100X of the dulcose unit group is converted to a dialdehyde unit group is usually referred to as a polysaccharide in which these polysaccharides are entrapped and treated with Asahi 1 with wood acid or its salt.
By doing so, 50 to 100X of the glucose units possessed by these polysaccharides were converted into dialdehyde units.

The rate of conversion to -, dialdehyde units - is 50 to 1
00% conversion, but 41 is preferable in the sense that 70 to 100% conversion is excellent in rLL properties and has easy water-resistant adhesion and is sufficiently threatening.

In addition, the polysaccharide #conductor referred to in Book II@ refers to the above-mentioned polysaccharide esterification book, etherification book, gutsu7to compound, oxidation book, as well as # element, value production 1, etc. There may be partial decomposition or rearrangement of - and so on.

Furthermore, the iso7anate-based compound or its sodium bicarbonate used in the present invention may be any of -V-Flemen, for example, tolylene diisocyanate, difermethane diinocyanate, and H-1? The combination of 1 socia-specific compounds such as Namethyle/diiso V anate, df Clide 7 diinocyanate, Jujube V/diisocyanate, etc., and the combination of these isocyanate formulas and a compound that increases the water volume of rk4& for inocyanate j&! LL12 is an ant.

The water-resistant ** agent of the present invention is usually 1 to 50% by weight once passed through a 100 plate ag of Narushima molecular water M wave, and 50 to 100+X of the darcose unit group is converted to dialde unit -. 1 to 50 parts by weight of the polysaccharide and/or its conductor, preferably 1 to 50% by weight, as a powder or in a solution of 1 wt of water, and 1 to 50 parts by weight of an isocyanate compound. , preferably 1 to 10 times
It is prepared by adding is while stirring and making it into uniform crumbs.

In addition, this adhesive has a small test, a large warning, and a low-temperature sushi large! Add 5 sorghum, rice, etc. as a bulking agent, mel I, clay, bentonite, gantennium, mail calcium, stone 5, silicon dioxide, value - barium, main purpose, yang. You may optionally add 1 filler to 1 filler per weight.

In addition, if necessary, ℃, Stereobutadiene Rubber 2 Tetsutas, Acrylja Nitrile Butadiene Rapaque Tetsu, Ri■-Run 2 Per Latex, Isogrene? /(-2
? It is also possible to use any conventionally known aqueous latex, such as aqueous latex, natural rubber latex, etc., or carboxylates thereof.

When wood or paper is layered using Fukkaku's excellent crushing shoulder, even if it is submerged in cold water for a long time and crushed, it will not last until 4 hours in boiling water.
Excellent water resistance that lasts for 72 hours without peeling*
Not only can the *m* degree be reduced, but also the adhesion to the <S board can be eliminated based on the leaching of the K11fi agent when crushing plywood, etc.

Next, an example of implementation of the present invention will be shown.

Izen iqt ■ Holihinyl alcohol (bJL Kukure 51, PVA-
117) 10'IIL M Chosui-Nami, ■ Inobutyren・
Malay anhydride/ml co-polymerized mjil (dyvs, I80
RAM-Q4) F) A/4 10x water m* of Ecum salt, ■1031 plate% water solution of polyethylene oxide (Nippon Kai Kogyo 1 set P-1000), ■N- Methylol acrylic and heavy metal-containing T14 were prepared by reacting 2T at 60°C for 2 hours to create a structure).
Take 100 parts by weight of each of 7, and add to each of them 5 parts by weight of dialdehyde #11 (Japan Carlit α, Carmes No. 5, dialdehyde conversion rate 80%), 5 parts by weight of calcium carbonate (Shiraishi Kogyo α, white) P-40) 40 parts by weight of heavy wheat (Nissin Yukan Le Exhibition, Red), and 5 parts by weight of Di7 Elume I/Ciy Quanate series (Japan Polyurethane 1 member, Mirio Sen-IMR) 5 1 part by weight while stirring
Eh, a loose layer was obtained in the water resistant 11 of the present invention by crystallization on the turret.
-10,000, as a control, Gialde L de IIl#I#'kII
An isoadhesive agent was obtained in the same manner as in Example 1 except for the difference between I and II.

Each of the lIj agents obtained in step 5 was layered in 111 m and 11 layers on both sides of Rawa/*@ with a thickness of z5■ lS0f/w
Apply it at the opening of t, and then apply a 2-one rate at fiber with a thickness of Sα8mm on top of it, making sure that one direction is perpendicular to the other.
Temporary pressure was applied for 20 minutes at a pressure of 0/-.

Thereafter, it was inserted into a hot press maintained at 120 CK and hot pressed for 15 minutes at a pressure of 8 m/- to produce a sample tone plate.

Is this 5KL? After placing the test sample sound plate 4 under the J1 @ 1-hole device, heavy snow was applied according to the JA11m plywood Arannobu testing machine.
* was kept constant.

The line system of seven is shown below.

In addition, 4) Both the sample plate and the sample plate should not adhere to the hot plate during hot pressure.
1 completely free of O 9-alpha, Newton P-40) 40 heavy porcupines, hekinametelenediino V-a-base (reagent) 5 traces of richness were thoroughly crystallized, and a water-resistant tiii adhesive was obtained. .

On the other hand, an adhesive was obtained in the same manner as in Example 912, except that the dialdehyde solution was not added.

Apply the 1111kK111 adhesion layer of 25-thick 2-inch veneer to the layer of 1111kK111 at a rate of 150F/It, and apply a layer of α8mm thick to the surface of the 5K layer. Set the ratio plate so that the fiber directions are perpendicular to each other.
Open clamping was carried out for 20 minutes at a pressure of f/-.

That Yuu inserts it into the hot breath that has cooled to 120℃ and 84
It was hot-pressed for 15 minutes at a pressure of /- and then placed on a plate.

This sample plywood was placed in Tominai once with 14 mIILc, and JAal
There were some flaws in the test flow of the llll meeting IN standard.

The yarns are shown in the table below.

Collection line p451 Soptyren/Kurosui Mareino Kane Joint Society 111 Jil (K
Add 5% water by weight of Aymoecum salt (IIOBAM-Q6) to 30% water by weight of dialdehyde starch (IIOBAM-Q6) and add 30% by weight of dialdehyde starch Quantity -, styrenep! Dienok parktetutus (a favorite JilEko AKKJIl, -y s *
φ0692) Add 50 weight of Zheng, Tarta 30 weight of H, H and Kururu Rwei 1110 weight of i11 and mix uniformly.Furthermore, add 5 weight of Tolene diisocyanate (sample) -1 and stir until uniform. Next, a water-resistant adhesive of the present invention was obtained.

On the other hand, as an anti-leprosy drug, I was arrogant to use dialdehyde starch at the same time as IIJII Yu 5.

I was defeated by this 5K! The adhesive was applied to birch wood with a thickness of 10 cm at a rate of 150 F/wt (one side), and then a layer of birch wood with a thickness of 10 cm was layered at a rate of 150 F/wt (one side). Pressure was applied for 6Q minutes.

JIB, K-4 after installing the equipment in the II layer 1lk1
In accordance with 852, the ff1ll-II aneurysm area was made constant.

The 1111j& is shown in the following table.

From the above details, it can be seen that the adhesive of the present invention has excellent water-resistant adhesion performance.

Claims (2)

[Claims] (1) In the water that meets the water #I11 chemical molecules, a po9+tukaphyte and/or its O #4 body in which 50 to 100% of glucose units #0 are converted to dialdehyde units #,
A water-resistant adhesive formed by adding an inocyanate compound or a heavy compound of inocyanate. (2) One molecule of water is the conductor of polyvinyl alcohol, and polyacrylic is the conductor of polyvinyl alcohol.
Copolymerization of alkali salts, polyvinyl pyro νdone, polyteleneimine, α-olefins and anhydrous maleino mirrors 1 or 1 selected from #1
s or 1 proboscis of 2 or more proboscises - Tokuken no Sokakusai (1
)Waterproof **2a agent in item - (2) Potato 5 sorghum, potato, t-1 wheat, rice, ? Powder grown from electroplants such as gourd, tapioca, and gum, gum arabic, gum arabic, gum daa, locust bean gum, etc.
16117: is a bone # that is a combination of two or more types of cellulose, detrino, algin, and imeline.
A water-resistant adhesive based on 11 layers of vn (1) or (2) at.