JPS59120273A - Application of powdery adhesive agent - Google Patents

Abstract

PURPOSE:To obtain a body coated with an adhesive agent having thickness necessary for adhesion without plugging a porous part, by dipping a porous body having a surface to which viscous substance has been applied in the fluidized bed of a powdery adhesive agent. CONSTITUTION:Substance in a liquid or pasty state at an ordinary temp. is applied onto a porous body without plugging a porous part on its surface. The porous body coated with said viscous substance is then dipped in the fluidized bed of a powdery adhesive agent. Hence, the powdery adhesive agent is stuck to the porous body through said viscous substance. Consequently, the adhesive agent is applied to thickness necessary for adhesion without plugging the porous part.

Description

Detailed Description of the Invention This relates to a method, and more specifically, it involves applying a liquid or paste-like substance to the surface of a porous body at room temperature without blocking the surface pores. 1. By immersing a porous body coated with a paste-like substance into a layer in which powdered adhesive is flowing due to an air current,
This invention relates to a method for applying a powder adhesive to a porous body, which is characterized by depositing a powder adhesive through the liquid or base material. , Porous bodies have pores due to their original purpose. It has been difficult to apply an adhesive by effective means because the adhesive must be used in a closed state and the specific surface area relative to its volume is large.

In other words, when applying a liquid to base adhesive, use normal equipment such as a roll coater, spray gun, curtain flow coater, or gun. Thickness (50-300 μn
If an attempt is made to obtain l), the pores of the porous material will become clogged, causing the useful performance of the porous material such as breathability and flexibility to be lost or reduced, and the inside of the pores may become clogged. Since the adhesive is not deposited on one side, there is a disadvantage that the amount of adhesive h4 required increases by a factor of Schift to several tens of times. The same situation applies to hot-melt adhesives when using gun-type or one-liter type applicators. When applying a film adhesive, since the film usually does not have through-holes, it is necessary to completely cover the entire surface including the pores on the porous surface. Set the F'/L=4 □
Even when used, it has drawbacks such as poor permeability because it is essentially impossible to align with the pores of the porous body, and furthermore, it is difficult to automate the process. When applying powdered adhesive, there is a risk of clogging the pores of the porous material, regardless of whether you use the normal spraying method, electrostatic coating method (gun type, fluidized bath type), or preheated fluidized immersion method. It has the disadvantage that it is large and requires a large amount of adhesive.

The present inventors have completed the present invention as a result of extensive research into adhesive application methods that do not have such drawbacks.

In other words, the present invention first involves applying a substance that is gate-shaped or brown-strewn at room temperature to a thickness that does not block the pores on the surface of a porous body. The powdered adhesive is applied to the porous body by applying it to the outside and immersing the porous body in a fluidized bath in which the powdered adhesive is fluidized by an air current. How to apply powdered adhesive 1 This is an extremely effective and simple method that allows you to apply the adhesive to the thickness required for bonding without blocking the pores (without any loss of adhesive). be.

The advantages of the method of the present invention are listed below.

(1) Since the adhesive is applied only to areas other than the open pores of the porous body, the characteristics of the porous body such as breathability and flexibility are preserved.

(2) Since the adhesive is effectively applied, there is no loss of adhesive, and since it is not wasted, weight reduction is effectively maintained.

(3) Depending on the method of applying the liquid to paste-like substance, it is possible to apply from the entire surface of the adhesive to the areas other than the apertures to partial application.

(4) The coating thickness of the powder adhesive may be several g/m depending on the coating thickness of the liquid to paste-like substance, the immersion conditions in the fluidized bath, etc.
It can be controlled over a wide range of up to several hundred 9/m.

(5) Since it can be applied at room temperature, it can be applied to porous bodies with poor heat resistance and porous bodies with large heat capacity.

(6) Since the adhesive layer is applied onto the porous material and is fixed in a semi-solid state, there is no staining due to run-off, etc., and it does not fall off even when subjected to mechanical vibrations, making subsequent process operations easy. obtain.

(7) There is no problem of dusting or scattering as in the process of applying powdered adhesive (also, recovery is easy).

(8) Since the liquid to paste substance can be continuously applied to the porous body, the adhesive can be applied to multiple surfaces at the same time.

The adhesive coating process according to the method of the present invention is simple, clean, and can be an advantageous production process.

In the present invention, the substance to be applied to the outer surface of the porous body is a substance that is liquid or paste at room temperature, such as water, hydrocarbon type, chlorine type, monochloride type, ester type, ketone type, etc. liquid or paste adhesives such as epoxy, urethane, polyamide, acrylic, etc. A wide range of materials such as medium to high viscosity materials can be applied, but which porous materials should be applied? Solvent resistance/pore shape and bite/bite/9
Required coating thickness 1, holding power of powder adhesive 1. It is necessary to select it after considering the application method, suitability for the ability, etc. Also, depending on the powdered adhesive used at the same time, the performance may deteriorate depending on the substance applied, so this must also be taken into consideration. The criterion for appropriate selection is that the pore size of the porous material should be small, and if the second pore size is large and the adhesive is to be applied thickly, an adhesive solution of medium to high viscosity or a Emulsion or liquid or paste adhesives are preferred.

The adhesive used in the present invention has an appropriate adhesiveness after being coated, and maintains the adhesiveness appropriately by applying powdered adhesive several times.
In other words, materials that rapidly lose their stickiness are suitable.

This adhesive can be used as a base, as described above, or as a melt (
(7) Adhesives are widely available on the market, such as epoxy, urethane, silicone, rubber, polyamide, and acrift types (7) in the form of coagulated, emulsion, etc. Candidate.

When these adhesives are used (4), the powdered adhesive to be applied (with τ and then A) is a heat-curing adhesive (where ' is attached).
It is preferable to use a thermosetting liquid-paste adhesive such as urethane-based or polyamide-based adhesive.

In addition, although there may be some limitations depending on the porous body and the type of powdered adhesive, the temperature of the present invention may be limited depending on the porous body and the type of powdered adhesive. It is more desirable to use an adhesive that has a greater degree of freedom in maintaining and controlling the next process (7). As mentioned above, there are various kinds of adhesives such as acrylic type, vinyl type rubber type, etc. Rubber type adhesives include natural rubber, SBR, recycled rubber, etc. with ease, and are partially cross-linked. There are also some that have been modified by methods such as 1, and various types of acrylic adhesives are commercially available, mainly based on acrylic acid ester polymers of aliphatic alcohols with 2 to 12 carbon atoms. All of them can be used.

The coating thickness of the liquid or paste substance applied to the porous body is preferably in the range of 1'1 to 150 am, and preferably 5 μm.
If there is no vortex, the coating material penetrates into the powder adhesive layer and lacks the ability to coagulate and hold the adhesive, so it is virtually impossible to adhere the adhesive in a fluidized bath. C Riya 1ku, 1
If the thickness exceeds 50 μm, the amount of applied material may be greater than the amount of adhesive adhered in the fluidized bath, and during the subsequent heating bonding process, foaming of the solvent, etc. may occur, and the adhesion may deteriorate. Performance is more likely to deteriorate. Also, it goes without saying that it is necessary to set an amount of coating that does not block the pores of the porous body.

Further, although the coating is applied to areas other than the openings of the porous body, some adhesion to the inner side near the openings does not impede the effects of the present invention, but rather can be separated in the subsequent process. 7. Glue the material (adherent material) together. ) when the adhesion strength is improved (7
There are some things that are preferable.

The method for applying liquid to paste-like substances depends on its viscosity and/or shape of the surface to be applied, etc. - Spray gun, airless spray - Gunnato gun o - Sea brush, brush, etc., roll coater, Gelavia roll coater - , curtain flow = 1-ter, -)ia coater, one-curve screen printing machine on flat surface, dispensing, syringe, dip coating, etc. can be selected from a wide range of techniques.

When the porous material has a flat surface such as a non-nikum core, it is preferable to use roll coating.
Sonoto@'s roll coater varies depending on the coating thickness, e.g.
For coating thickness less than D Ottm, direct method,
For 50 μIn or more, you can choose the Su/Coos method.
For partial coating, select an engraved roll, depending on the material of the porous body, use a gono roll, metal roll, etc. If the viscosity of the coating substance is high (or if thick coating is required, use a sculptural roll for uniform coating). The number of transfer rolls may be increased or the number of transfer rolls may be increased as appropriate.

In the case of the powder adhesive used in the present invention at 1~C, thermoplastic 4'ffJ resins, thermosetting 4'ffJ resins, and so-called composite resins in which the two are mixed can be used. Thermoplastic/i
Raw IJ 11 items include polyamide, polyefster,
Examples include ethylene-acrylate copolymer and heptasaponide, ethylene-edyl acrylate copolymer, and vinylbutyral.These resins can be obtained in powder form during polymerization, or can be obtained by freezing and pulverizing after polymerization. It can be easily powdered by mechanical crushing or precipitation from a solution.

Examples of thermosetting resins include epoxy resins, phenol resins, boron ester resins, acrylic resins, etc. These mainly consist of a curing agent and a base resin, and both It can be obtained by methods such as melt-blending, grinding, and tri-blending the two separately in a grinding layer.

So-called composite adhesives consisting of a mixture of thermoplastic resin and thermosetting resin include nylon-epoxy, nylon-phenol, polyester-epoxy, silicone-epoxy, phenolic vinyl, and phenolic adhesive.
Examples include nitrile rubber, epoxy-phenolic, etc.
The manufacturing method for these adhesives is the same as that for the thermoplastic resin or thermosetting resin, but the best method can be selected in consideration of the required adhesive performance, adhesive conditions, etc.

The method of the present invention uses a fluidized dipping method to deposit the powdered adhesive, using a fluidized bath.

The method of applying powdered adhesive is different from other powder application methods, such as the method of spreading powder with a spreader, because it is applied to areas other than those to which it should be applied, and if the construction surface is a curved surface, sufficient adhesion may occur. 0. Limited to one side of the top or bottom surface. For example, the method of coating using an electrostatic coating machine has the disadvantage that the coating is applied to areas other than the simple area to be coated, whereas the coating can be applied to any flat or curved surface, and can be applied to all surfaces or surfaces. Partial application is possible,
This is because partial coating has many advantages such as multi-surface coating and can fully exhibit the effects of the present invention.

The fluidized tank used in the present invention is appropriately selected depending on the particle size and specific gravity of the powder used, the size of the porous body, etc. The general conditions for fluidized immersion are powder particle size of 80
~15C1μm, porous plate pore diameter (bed of fluidized tank) 10-6
0/jm, and the amount of powder in the tank, the amount of air blown, etc. are adjusted depending on the size of the porous body. Typical soaking time is 5
~30 seconds. When applying the powdered adhesive according to the method of the present invention, the amount of the powdered adhesive to be applied is 10 parts by weight or less per 1 part by weight of the liquid or pasty substance, depending on the desired properties. Can take a value. For example, for 15 parts by weight of liquid to paste substance applied per unit area, 70 to 1 Do of powder adhesive
Applying parts by weight in a fluidized bath is a suitable example.

The porous bodies to which the method of the present invention is applied include paper, wood,
Honey, I-core made from materials such as aluminum and aluminum, foams made from synthetic resins such as polyethylene and polyvinyl chloride, inorganic materials such as cement, silicic acid, and calcium, and even punched mail. It is a perforated plate, etc., and can be effectively applied when bonding those materials.

In particular, when applied to the production of honeycomb sandwich panels, etc., which are currently attracting attention as a material for energy saving, it is possible to achieve greater efficiency and energy saving without sacrificing weight reduction, making a significant contribution to industry.

The present invention will be further explained below using Examples.

Example: Both end faces of the cells of a paper honeycomb core (cell size: 6°4 mm, height: 25 mm) made of 16017 m thick kraft paper with the top surface polished were coated with the acrylic adhesive Arontack S-2 (with a roll coater). 180 (manufactured by Toagosei Chemical Industry Co., Ltd.: ethyl acetate solution, solid content 60%, viscosity 1
3. OO, Ocps) was applied to a coating thickness of 60 to 80 μm near the cell edge. Next, the No. Nikum core coated with the adhesive was coated with a powdered adhesive FS-175, P (
(manufactured by Toagosei Chemical Industry Co., Ltd.)) was immersed for 25 seconds in a fluidized tank in which it was suspended at an average of 200 km/m to obtain a new adhering film of powdered adhesive of 200 to 300 μm. This powder adhesive layer adhered well and did not cause any problems in the heat bonding process following the auctioning process.

Patent applicant name Toagosei Chemical Industry Co., Ltd.

Claims (1)

[Claims] 1. At room temperature, the liquid or paste-like substance does not block the surface pores (the applied porous body is immersed in a fluidized bed of powdered adhesive to form a liquid or paste-like substance on the porous body). A method for applying a powder adhesive, characterized by applying the powder adhesive through a substance.