JPH08120091A - Preparation of urethane resin emulsion - Google Patents

Abstract

PURPOSE: To provide a process for continuously preparing a urethane resin emulsion which has low viscosity even in the case of a high solid content and excellent coatability. CONSTITUTION: A device is used which comprises a conduit for passing fluids to be mixed therethrough, a plurality of partitions provided within the conduits, and an agitator comprising a plurality of spiral agitating blades protruded in the axial direction and a periphery thereof. The agitator is disposed within the conduit and supported so as to be vibrated minutely along the axial direction. The agitator is axially vibrated while passing the mixing fluid into the conduit. This vibration creates relative movement between the spiral agitating blade and the partitions to mix and disperse the fluids. This device is used to mix and disperse a urethane resin and water as the fluids in each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous method for producing a urethane resin emulsion having excellent coating suitability.

[0002]

2. Description of the Related Art Urethane resin emulsions are widely used for various purposes as glass fiber sizing agents and the like. Especially when this urethane resin emulsion is used as an adhesive, a coating agent or the like, there is an increasing demand for high-speed coating property and high-speed drying property in order to improve productivity. In order to meet such a requirement, a urethane resin having a large content (high solid content) from the viewpoint of high speed drying property and a low viscosity from the viewpoint of high speed coating property is suitable.

As a method for producing a urethane resin emulsion, a batch method is used in which raw materials are charged and dispersed in an apparatus such as a pot equipped with a homodisper. According to this, the particle size of the urethane resin particles can be increased to a certain extent with high solid content and low viscosity, but since there is a dead space for stirring, the particle size distribution is wide and it is extremely large enough to settle when left standing. The generation of particles is unavoidable, and as a result, there are drawbacks such that when the emulsion is left to stand, a precipitate is generated and the stability of the emulsion is poor. Further, in recent years, there has been a great demand for a continuous system from the viewpoint of productivity, but this method cannot meet this demand.

JP-A-4-31439 discloses that urethane prepolymer and water flow paths are continuously supplied to a continuous emulsifier equipped with stator teeth and rotor teeth respectively, and the rotor teeth are rotated at high speed. , A continuous method (method (1)) in which the emulsion is continuously taken out by dispersing with a shearing force between the rotor tooth and the stator tooth is disclosed.

In JP-A-5-132567, a pre-emulsified mixture of a urethane resin and water is introduced into a channel in a chamber under pressure and collided with a flat portion in the channel at high pressure. A continuous system (system (2)) is disclosed in which a continuous high-pressure emulsifying machine that emulsifies liquids by colliding with each other is continuously supplied, dispersed, and emulsions are continuously extracted.

However, in the methods (1) and (2), since the particles are dispersed with high shear, the obtained urethane resin particles become fine, and in the system having a high urethane resin content (high solid content system). There are problems that the viscosity of the emulsion becomes too high and uniform dispersion may not be possible, or that even if the emulsion is uniformly dispersed, it is difficult to obtain a dispersion having a high solid content and low viscosity that satisfies the above requirements.

Further, in the method (1), since a very high shearing force is applied, in a system in which the emulsifier and the hydrophilic component are small and the dispersion stability is comparatively inferior, the urethane resin particles once dispersed are agglomerated again and stirred. However, there are drawbacks such as adhesion to the surface and difficulty in dispersion when urethane resin having high viscosity is used as a raw material. Further, in the method (2), it is necessary to premix the urethane prepolymer and water, and there is a drawback that the number of steps is increased accordingly.

[0008]

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a continuous method for producing a urethane resin emulsion which has a low viscosity even at a high solid content and is excellent in coating suitability.

[0009]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a conduit through which a fluid to be mixed flows for a urethane resin emulsion, a plurality of partition plates mounted in the conduit, a shaft and a diameter around the shaft. A device having a plurality of spiral stirring blades formed to project in a direction, the stirring member being arranged in the conduit and being supported so as to be capable of fibrillation along the axial direction. While the fluid to be mixed is circulated in the conduit, the agitating body is vibrated in the axial direction to impart a relative motion between the spiral stirring blade and the partition plate, and to mix the fluid to be mixed. The urethane resin and water are mixed and dispersed as the fluid to be mixed by using a device for mixing and dispersing the fluid.

As the above device, Japanese Patent Publication No. 15247/1990
JP, JP-A-3-258337, JP, 1-2
The devices described in JP-A-31929, JP-A-2-43933, and JP-B-3-25214 are used. One example is shown in FIG. In FIG. 1, the raw material urethane resin and water are continuously supplied from the lower supply port 6. The supplied urethane resin sequentially and alternately passes between the housing 1 and the spiral stirring blade 3 and between the partition plate 2 fixed to the housing 1 and the spiral stirring blade 3.
At this time, a vortex flow generated by vertically vibrating the spiral stirring blade 3 fixed to the shaft 4 connected to the vibration drive source 5, and further shear generated between the housing 1 and the partition plate 2. The urethane resin is dispersed and emulsified in water by the force. The obtained dispersion liquid is continuously taken out from the take-out port 7. Examples of the above-mentioned device include a vibro mixer manufactured by Chilling Industry Co., Ltd.

The pump used for supplying the urethane resin and water in the above apparatus is not particularly limited, but a pump having excellent quantitative supply property is preferable, and examples thereof include a plunger pump, a gear pump and a mono pump.

The method for emulsifying the urethane resin in the present invention is not particularly limited. For example, a solution of the urethane resin (A) in an organic solvent may be added to the emulsifier (E).
In the presence of, a method of dispersing and emulsifying in water, an organic solvent solution of a self-water-dispersible urethane resin (B) having an ionic or potentially ionic functional group, a nonionic hydrophilic group, without an emulsifier, Method of dispersing and emulsifying in water, urethane prepolymer (C) having an isocyanate group at the terminal or an organic solvent solution thereof is dispersed and emulsified in water in the presence of an emulsifier (E), and at the same time, after that or before,
A method of adding a chain extender (F) having two or more active hydrogen groups capable of addition reaction to an isocyanate group, having an ionic or potentially ionic functional group, a nonionic hydrophilic group, and A self-water-dispersible urethane prepolymer (D) having an isocyanate group at the terminal or an organic solvent solution thereof is dispersed and emulsified in water without an emulsifier,
At the same time, after that, or before that, there may be mentioned a method of adding a chain extender (F) having two or more active hydrogen groups capable of addition-reacting with an isocyanate group. Of these, the method (1) is most preferable because the amount of solvent used can be reduced, the emulsifier is not used, and the water resistance is good.

The urethane resin (A) and the urethane prepolymer (C) are the compound (a) having an active hydrogen atom capable of reacting with an isocyanate group in the molecule, and an aliphatic or aromatic organic poly It is produced from the isocyanate compound (b).

As a method for producing the urethane resin (A) and the urethane prepolymer (C), a known method is used, and the equivalent ratio of isocyanate groups to active hydrogen molecules is 0.5: 1 to 2. It is preferably 3: 1. Particularly in the production of the urethane prepolymer (C), 1.
It is preferably 1: 1 to 2: 1.

The reaction temperature in the production of the urethane resin (A) and the urethane prepolymer (C) is 50 to 1
50 ° C is preferred. Examples of the reaction method include bulk polymerization and solution polymerization. The solvent used in the case of solution polymerization is preferably one that is inert to isocyanate groups, highly miscible with water, and has a boiling point of 100 ° C. or lower, and examples thereof include acetone, methyl ethyl ketone, tetrahydrofuran, and methyl acetate. Etc. When a solvent having a boiling point higher than 100 ° C. is used, it is difficult to remove only the solvent from the obtained dispersion in the emulsification step, which is not preferable.

The urethane resin (B) and the urethane prepolymer (D) are the compound (a) having an active hydrogen atom capable of reacting with an isocyanate group in the molecule, an aliphatic or aromatic organic polyisocyanate compound. (B),
And an ionic or potentially ionic functional group in the molecule,
It is produced from the compound (c) having a nonionic hydrophilic group and a functional group containing an active hydrogen atom capable of reacting with an isocyanate group.

As the method for producing the urethane resin (B) and the urethane prepolymer (D), a known method is used, but the equivalent ratio of isocyanate groups to active hydrogen atoms is 0.5: 1 to 2. It is preferably 3: 1. Particularly in the production of the urethane prepolymer (D), 1.
It is preferably 1: 1 to 2: 1.

The reaction temperature in the production of the urethane resin (B) and the urethane prepolymer (D) is 50 to 1
50 ° C is preferred. Examples of the reaction method include bulk polymerization and solution polymerization. The solvent used in the case of solution polymerization is preferably one that is inert to isocyanate groups, highly miscible with water, and has a boiling point of 100 ° C. or lower, and examples thereof include acetone, methyl ethyl ketone, tetrahydrofuran, and methyl acetate. Etc. When a solvent having a boiling point higher than 100 ° C. is used, it is difficult to remove only the solvent from the obtained dispersion in the emulsification step, which is not preferable.

As the compound (a), polyols having two or more hydroxyl groups in the molecule, polyamines having two or more primary or secondary amino groups in the molecule, and the like are used. , And polyols are preferable. Examples of the polyols include ethylene glycol, diethylene glycol, 1,4-butanediol, 1,6
-Polyhydric alcohols such as hexanediol, trimethylolpropane and glycerin; polyether polyols such as polyethylene glycol and polypropylene glycol;
Dicarboxylic acids such as adipic acid, sebacic acid, itaconic acid, maleic anhydride, terephthalic acid, isophthalic acid and ethylene glycol, diethylene glycol, triethylene glycol, 1,4-butanediol, 1,6-hexanediol, tripropylene glycol, Polyester polyols obtained from glycols such as neopentyl glycol; polycaprolactone polyols, polytetramethylene ether glycols, polybutadiene polyols, hydrogenated polybutadiene polyols, polycarbonate polyols, polythioether polyols, polyacrylic ester polyols and the like. These may be used alone or in combination of two or more. The above-mentioned polyols are appropriately selected according to the purpose and application, and required physical properties such as hardness and adhesiveness can be arbitrarily designed.

As the compound (b), an organic polyisocyanate compound having two or more isocyanate groups in the molecule is used. As the organic polyisocyanate, for example, 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, 2,
4,4-trimethylhexamethylene diisocyanate,
2,2,4-trimethylhexamethylene diisocyanate, 3-isocyanate methyl-3,5,5-trimethylcyclohexyl isocyanate, dicyclohexylmethane-4,4'-diisocyanate, methylcyclohexyl-2,4-diisocyanate, methylcyclohexyl-2, 6-diisocyanate, xylylene diisocyanate, 1,3-bis (isocyanatomethyl) cyclohexane, tetramethyl xylylene diisocyanate,
Aliphatic diisocyanates such as transcyclohexane-1,4-diisocyanate; 2,4-toluylene diisocyanate, 2,6-triylene diisocyanate,
Diphenylmethane-4,4'-diisocyanate, 1,
Aromatic diisocyanates such as 5-naphthene diisocyanate, tolidine diisocyanate, tetraalkyldiphenylmethane diisocyanate and paraphenylene diisocyanate; lysine diisocyanate, lysine ester triisocyanate, triphenylmethane triisocyanate, 1,6,11-undecane triisocyanate, 1,8 -Diisocyanate-4-isocyanate Triisocyanates such as methyloctane, 1,3,6-hexamethylene triisocyanate, and bicycloheptane triisocyanate may be used. These may be used alone or in combination of two or more.

The compound (c) has at least one ionic or potentially ionic functional group in the molecule, a nonionic hydrophilic group, and an active hydrogen atom capable of reacting with an isocyanate group. A compound having a functional group containing is used.

Examples of the ionic functional group include:
Examples thereof include anionic functional groups such as sulfonate groups and carboxylate groups; cationic functional groups such as ammonium groups.

The latent ionic functional group means a functional group which can be converted into an ionic group by adding an appropriate compound, that is, the latent ionic functional group is
By adding an appropriate ionizing agent or the like before, during or after the dispersion operation, the ionic functional group can be completely or partially converted. Examples of the latent ionic functional group include a latent anionic functional group such as a sulfonic acid group and a carboxylic acid group; and a latent cationic functional group such as a tertiary amino group. The tertiary amino group is converted to a cationic group such as a quaternary amino group (ammonium group) by a suitable quaternizing agent. Among the above-mentioned ionic or latent ionic functional groups, anionic or latent anionic functional groups are preferable.

The latent anionic urethane resin obtained by using the above-mentioned compound having a latent anionic functional group removes the latent anionic group in the urethane resin by using an ionizing agent called a so-called neutralizing agent. It can be converted completely or partially into anionic groups.

Examples of the neutralizing agent include volatile tertiary amines such as ammonia, trimethylamine and triethylamine. Since these can be removed by scattering during drying, the water resistance of the film does not decrease, which is preferable. Alkali metal salts and non-volatile amines can also be used as the above-mentioned neutralizing agent, but the neutralizing agent cannot be scattered and removed during drying, and the water resistance of the film is reduced, which is not preferable.

Examples of the nonionic hydrophilic group include:
Examples thereof include ether groups. As the ether group,
A segment having a large number of highly hydrophilic ether bonds such as a polyethylene oxide chain is preferable. However, since such a nonionic hydrophilic group remains in the dry film and reduces the water resistance of the film, it is not preferable to use a large amount.

The functional group containing an active hydrogen atom capable of reacting with the isocyanate group is preferably a hydroxyl group, a primary or secondary amino group, and the compound (c) contains at least one of these functional groups.

The compound having a latent anionic functional group and a functional group capable of reacting with an isocyanate group is preferably a compound having a carboxyl group and two hydroxyl groups in the molecule, for example, dimethylol lactic acid and dimethylol. Propionic acid, dimethylol butyric acid, dimethylol valeric acid, dioxymaleic acid, dioxybenzoic acid and the like can be mentioned.

The emulsifier (E) is not particularly limited, and examples thereof include nonionic emulsifiers such as polyoxyethylene nonylphenyl ether and polyoxyethylene lauryl ether; alkyl sulfate ester salts, alkylbenzene sulfonates, alkylsulfosuccinates, Examples thereof include anionic emulsifiers such as polyoxyethylene alkyl sulfate. The amount of the emulsifier (E) added is preferably 5 parts by weight or less with respect to 100 parts by weight of the urethane resin solid content. If it exceeds 5 parts by weight, the water resistance is significantly reduced.

The chain extender (F) is a compound having two or more active hydrogen atoms capable of reacting with an isocyanate group in the molecule, and examples thereof include polyamines and polyols.

Examples of the above polyamines include ethylenediamine, 1,4-butanediamine, 1,6-hexamethylenediamine, piprazine and 3-aminomethyl-.
Examples include low molecular weight diamino compounds such as 3,5,5-trimethylcyclohexylamine. Examples of the above-mentioned polyol include glycols such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hensandiol and polyethylene glycol. Water can also be used as the chain extender (F). The addition of the chain extender (F) may be performed before, simultaneously with, or after water dispersion.

In the method for producing the urethane resin emulsion of the present invention, when an organic solvent is used, it is preferable to distill off the organic solvent for safety and hygiene. The method for distilling off the organic solvent is not particularly limited, and for example, a method in which a urethane resin emulsion containing a solvent is transferred to a kettle and depressurized under stirring to distill off the solvent, various thin film evaporators (Hitachi, Sepcon evaporation) Vessel; made by Shinko Faudler Co., WFE thin film distillation apparatus; made by Tokushu Kika Kogyo Co., Ltd., Hibisupappa etc.)
And the like. In particular, the method using a thin film evaporator is preferable because the solvent distillation step can be made continuous, and a continuous continuous line from dispersion emulsification to solvent distillation can be set up to improve productivity.

For the purpose of improving various physical properties, the urethane resin emulsion according to the present invention contains acrylic, vinyl acetate, styrene, polyester, polyamide,
SBR type, EVA type, chloroprene type, epoxy type, alkylphenol type resin, rosin type resin, terpene phenol type resin, terpene type resin, xylene type resin, ketone type resin, phenol type resin, coumarone resin, aromatic petroleum resin, Various resins such as aliphatic petroleum resins; crosslinking agents such as aziridine compounds, epoxy compounds, isocyanate compounds and carbodiimide compounds may be added. These additives may be added in the form of an aqueous dispersion such as an emulsion or an aqueous solution, or may be added to the urethane resin before the dispersion and emulsification of the urethane resin and then by the method of dispersion emulsification in coexistence.

Further, silica, calcium carbonate, clay,
Fillers such as aluminum hydroxide; pigments such as titanium oxide and carbon black; inorganic colloids such as alumina sol and silica sol; plasticizers, leveling agents, thickeners, antioxidants, and ultraviolet absorbers may be added.

The urethane resin emulsion obtained by the method of the present invention can be used as an adhesive, a coating agent, a fiber treating agent, a paper strength enhancer and the like.

[0036]

According to the production method of the present invention, since the shearing force during dispersion is small, a urethane resin emulsion having a relatively large particle size can be obtained. The urethane resin emulsion thus obtained has a smaller total particle surface area, a smaller interaction between particles, and a lower viscosity even when the solid content is the same as in the case where the particle size is small. In addition, since the dead space of stirring is very small, the particle size distribution becomes narrow, and when the particles are left to stand, no particles having an extremely large particle size will be produced as they settle.

[0037]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

Production Example 1 In a separable flask equipped with a cooling tube and a stirring blade, 100 parts by weight of polycaprolactone diol (hydroxyl value = 57, PLACCEL, L220AL manufactured by Daicel Chemical Industries, Ltd.), 25.0 parts by weight of isophorone diisocyanate, and di 3.2 parts by weight of methylolpropionic acid and 85.5 parts by weight of methyl ethyl ketone as a diluting solvent were added, and the isocyanate content was 1.5% by weight while stirring the mixed solution.
Polymerization was carried out at the boiling point until the temperature became below. After the polymerization liquid was cooled to room temperature, 2.5 parts by weight of triethylamine was added for neutralization. The viscosity of the obtained prepolymer solution is 200 mPa.
・ It was s.

Production Example 2 In a separable flask equipped with a cooling tube and a stirring blade, 100 parts by weight of polycaprolactone diol (hydroxyl value = 57, PLACCEL, L220AL manufactured by Daicel Chemical Industries, Ltd.), 25.0 parts by weight of isophorone diisocyanate, and di 3.2 parts by weight of methylolpropionic acid and 32.1 parts by weight of methyl ethyl ketone as a diluting solvent were charged, and the isocyanate content was 1.5% by weight while stirring the mixed solution.
Polymerization was carried out at the boiling point until the temperature became below. After the polymerization liquid was cooled to room temperature, 2.5 parts by weight of triethylamine was added for neutralization. The viscosity of the obtained prepolymer solution is 4200 mP.
It was a.s.

Example 1 In a vibro mixer VM-HS5.30 manufactured by Chill Industry Co., Ltd.,
The urethane prepolymer solution produced in Production Example 1 and 1.
247 ml / 84% ethylenediamine aqueous solution
Min, 122 ml / min continuously fed without premixing,
Continuous dispersion emulsification was performed at a frequency of 70 Hz and an amplitude of 5 mm. The obtained emulsion was heated to 50 ° C. under reduced pressure, and methyl ethyl ketone was distilled off. The urethane resin emulsion obtained had a solid content of 55%, a viscosity of 510 mPa · s, an average particle diameter of 3.52 μm, and a maximum particle diameter of 7.02 μm.
There was almost no deposit inside the mixer after dispersion.
When the obtained emulsion was allowed to stand for 1 week, no precipitate was generated.

Example 2 In a vibro mixer VM-HS5.30 manufactured by Chilling Industry Co., Ltd.,
The urethane prepolymer solution and water produced in Production Example 1 were continuously supplied at 247 ml / min and 120 ml / min respectively without premixing, and continuously dispersed and emulsified at a frequency of 70 Hz and an amplitude of 5 mm. To 1000 g of the obtained emulsion, 12.4 g of an aqueous solution containing 6.2 g of ethylenediamine was added with stirring to carry out a chain extension reaction, and then heated at 50 ° C. under reduced pressure to distill off methyl ethyl ketone. The resulting urethane resin emulsion has a solid content of 55% and a viscosity of 680.
mPa · s, average particle size is 2.83 μm, maximum particle size is 6.
It was 50 μm. There was almost no deposit inside the mixer after dispersion. When the obtained emulsion was allowed to stand for 1 week, no precipitate was generated.

Example 3 Using the urethane prepolymer solution prepared in Preparation Example 2,
207 ml each of urethane prepolymer solution and water
A urethane resin emulsion was obtained in the same manner as in Example 2 except that the components were continuously fed at a flow rate of 120 ml / min for 120 ml / min. The urethane resin emulsion thus obtained had a solid content of 55%, a viscosity of 540 mPa · s, and an average particle size of 3.
The particle size was 22 μm and the maximum particle size was 7.30 μm. There was almost no deposit inside the mixer after dispersion. When the obtained emulsion was allowed to stand for 1 week, no precipitate was generated.

Comparative Example 1 A rotor stator continuous disperser (Ebara Seisakusho Co., Ltd., Ebara Milder MON303V) was charged with 247 ml / min and 122 ml / min of the urethane prepolymer solution and the 1.84% ethylenediamine aqueous solution produced in Production Example 1, respectively. , Continuous feeding without pre-mixing, rotation speed 10000r
It was continuously dispersed and emulsified at pm. The obtained emulsion was heated to 50 ° C. under reduced pressure, and methyl ethyl ketone was distilled off. The solid content of the obtained urethane resin emulsion is 55%, the viscosity is 6900 mPa · s or more, the average particle size is 1.5 μm,
The maximum particle size was 3.0 μm. After the dispersion, there were deposits inside the disperser. When the obtained emulsion was allowed to stand for 1 week, no precipitate was generated.

Comparative Example 2 A rotor-stator continuous disperser (Ebara Seisakusho Co., Ltd., Ebara Milder MON303V) was charged with 207 ml each of the urethane prepolymer solution and water produced in Production Example 2.
/ Min and 120 ml / min were continuously supplied without pre-mixing and continuous dispersion emulsification was performed at a rotation speed of 10,000 rpm, but uniform dispersion emulsification was not possible.

Comparative Example 3 672 parts by weight of the urethane prepolymer solution prepared in Preparation Example 1 and 330 parts by weight of water were mixed to prepare a premixed solution containing particles of about several tens of μm, and then the high pressure emulsifier Microfluidex Co. Continuously supplied to the Microfluidizer made by
It was continuously dispersed and emulsified at a pressure of 500 kg / cm ² , but could not be uniformly dispersed and emulsified.

Comparative Example 4 330 g of water was charged into a 2 L container, and the mixture was placed in a homodisper for 8 hours.
While stirring at 000 rpm, 672 g of the urethane prepolymer solution produced in Production Example 1 was added and dispersed. To the obtained emulsion, 14.0 g of an aqueous solution containing 7.0 g of ethylenediamine was added with stirring to carry out a chain extension reaction, and then heated at 50 ° C. under reduced pressure to distill off methyl ethyl ketone. The solid content of the obtained urethane resin emulsion is 5
The viscosity was 5% and the viscosity was 10,000 mPa · s or more. The average particle size was 0.92 μm.

Comparative Example 5 In a 2 L container, 330 g of water was charged, and 1 part was added using a homodisper.
While stirring at 000 rpm, 672 g of the urethane prepolymer solution produced in Production Example 1 was added and dispersed. To the obtained emulsion, 14.0 g of an aqueous solution containing 7.0 g of ethylenediamine was added with stirring to carry out a chain extension reaction, and then heated at 50 ° C. under reduced pressure to distill off methyl ethyl ketone. The solid content of the obtained urethane resin emulsion is 5
The viscosity was 5% and the viscosity was 410 mPa · s. The average particle size was 2.41 μm and the maximum particle size was 30 μm. In addition, when the obtained emulsion was allowed to stand for 1 week, a precipitate was generated.

Evaluation Method (1) Measurement of Solid Content The dry residual fraction after drying at 110 ° C. for 2 hours was measured. (2) Measurement of viscosity A BM type viscometer manufactured by Tokyo Keiki Co., Ltd. was used. Rotor No.
3, the rotation speed was 60 rpm, and the temperature was 23 ° C. (3) Measurement of average particle size Laser diffraction particle size distribution analyzer SALD manufactured by Shimadzu Corporation
-1000 was used.

[0049]

Industrial Applicability According to the present invention, since the urethane resin emulsion is produced by using the above-mentioned apparatus, it has a high solid content and a low viscosity which are difficult to obtain by the conventional production method, and it is precipitated even when left standing. It is possible to continuously produce a stable urethane resin emulsion without the formation of matter, and as a result,
When the obtained urethane resin emulsion is used as an adhesive, a coating agent, etc., high-speed coating and high-speed drying are possible and productivity is improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an operating state of an example of a dispersion apparatus of the present invention.

FIG. 2 is an enlarged view showing an operating state of a stirring body of the dispersion device shown in FIG.

[Explanation of symbols]

 1 Housing 2 Partition Plate 3 Spiral Stirring Blade 4 Shaft 5 Vibration Drive Source 6 Supply Port 7 Extraction Port 8 Raw Material Tank 9 Product Tank 10 Fixed Quantity Supply Pump

Claims (1)

[Claims] 1. A conduit through which a fluid to be mixed flows.
It comprises a plurality of partition plates mounted in the conduit, and an agitator having a shaft and a plurality of spiral agitating blades projecting radially around the shaft, the agitator being disposed in the conduit. And a device that is supported so as to be finely movable along the axial direction, by vibrating the stirring body in the axial direction while circulating the fluid to be mixed in the conduit, the spiral stirring blade. Urethane resin and water are mixed and dispersed as the fluid to be mixed by using a device for imparting relative motion between the partition plate and the partition plate and mixing and dispersing the fluid to be mixed. Method for producing emulsion.