JP3966538B2 - Method for producing organopolysiloxane emulsion - Google Patents

Description

【００２６】
【発明の効果】
本発明によれば、安定性に優れた官能基含有オルガノポリシロキサンエマルジョンを製造することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a functional group-containing organopolysiloxane emulsion having excellent stability and low content of low molecular weight siloxane.
[0002]
[Prior art]
Organopolysiloxane emulsion is used as a release agent for synthetic resin, rubber, paper, mold, etc., as a coating agent for synthetic resin film, sheet, or paper surface, organic fiber such as natural fiber, synthetic fiber, inorganic fiber such as glass fiber, etc. It is useful as a component of water repellents, fiber softeners, smoothing agents, or emulsion paints and antifoaming agents, but as such an organopolysiloxane emulsion, in consideration of stability and high degree of polymerization, etc. It is preferable to use one having a small particle size produced by emulsion polymerization. Examples of the method for producing such an emulsion polymer include a method in which a strong acid or a strong alkali is used as a polymerization catalyst (Japanese Patent Publication No. 34-2041), alkylbenzene sulfonic acid, alkyl naphthalene sulfonic acid, aliphatic sulfonic acid, silylalkyl sulfone. There are methods for emulsion polymerization of organopolysiloxane using acid, aliphatic substituted diphenyl ether sulfonic acid, alkyl hydrogen sulfate, etc. as a polymerization catalyst (Japanese Patent Publication No. 41-13995, Belgian Patent No. 686812, USP No. 3360491).
[0003]
In addition, triorganomers of diorganosiloxane are emulsified and dispersed in an aqueous salt-type surfactant solution, an ion exchange resin is added to this dispersion, and the ion exchange of the salt-type surfactant is performed to polymerize. Method (Japanese Examined Patent Publication No. 54-19440).
Further, as a method for obtaining an amino-functional organopolysiloxane emulsion, a cyclic organopolysiloxane and a functional group-bonded organotrialkoxysilane are emulsified with a sulfonic acid-based or quaternary ammonium salt-based surfactant, and emulsion polymerization is performed ( No. 56-38609).
[0004]
On the other hand, as a method for producing an organopolysiloxane emulsion in which volatile low molecular weight siloxane is reduced, a method of polymerizing an emulsion composed of a hydroxyorganopolysiloxane at both ends and a catalyst at 40 ° C. or lower (Japanese Patent Laid-Open No. 4-178429), A method of emulsion polymerization of both ends hydroxyorganopolysiloxane and both ends amino functional organopolysiloxane (JP-A 4-198321), a method of emulsion polymerization in the presence of both ends hydroxyorganopolysiloxane and a specific sulfonic acid (JP A 11-71522). However, since these are equilibration reactions with an acid or alkaline catalyst, volatile low molecular weight siloxanes are contained in the siloxane in an amount of about 12% by weight. In addition, the above methods all have a long polymerization time, and are expected to be accelerated.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a method for producing an organopolysiloxane emulsion having excellent stability and low content of low molecular weight siloxane.
[0006]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors obtained an initial emulsion by emulsifying a terminal hydroxyorganopolysiloxane and a functional group-containing organoalkoxysilane using a surfactant and water. By reducing the average particle size to 250 nm or less and performing condensation polymerization in the absence of a catalyst , an organopolysiloxane emulsion having a low low molecular weight siloxane content and excellent stability can be obtained. The present invention was completed by finding it useful as a treating agent for synthetic fiber stuffed cotton and a texture improving agent for wool and synthetic fabrics. In particular, functional group-containing organoalkoxysilanes are easy to disperse in aqueous systems, so it was difficult to introduce a predetermined amount of functional groups into the organopolysiloxane by the conventional emulsion polymerization method, but the initial emulsion was made to have a particle size of 250 nm or less. This was made possible by condensation polymerization to complete the present invention.
That is, the present invention provides (A) the following general formula (1)
H- [O-Si (R) ₂ ] _n -OH (1)
(Wherein, R represents a substituted or unsubstituted monovalent hydrocarbon group n having 1 to 20 carbon atoms represents an integer satisfying 10 ≦ n ≦ 200), and the number of silicon atoms is 10 or less. An average particle size of 50 to 250 nm of an emulsion containing a terminal hydroxyorganopolysiloxane having a cyclic low molecular weight siloxane content of 5% by weight or less, (B) a functional group-containing organoalkoxysilane, (C) a surfactant, and (D) water. An initial emulsion is obtained by emulsifying and dispersing so that the emulsion is polycondensed in the absence of a catalyst , and then neutralized. This is an excellent method for producing an organopolysiloxane emulsion.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail.
The component (A) in the present invention is a terminal hydroxyorganopolysiloxane represented by the general formula (1) and having a cyclic low molecular weight siloxane having 10 or less silicon atoms and having a content of 5% by weight or less.
In general formula (1), R represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms, and n represents an integer satisfying 10 ≦ n ≦ 200.
Examples of R include alkyl groups such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl, tetradecyl, hexadecyl, octadecyl, eicosyl; cycloalkyl groups such as cyclopentyl and cyclohexyl; Aryl groups such as phenyl and tolyl; unsaturated alkenyl groups such as vinyl and allyl; groups in which some or all of the hydrogen atoms bonded to these groups are substituted with halogen atoms, and the like. Among these, those containing 90 mol% or more of methyl groups are industrially preferable.
[0008]
In the present invention, when the organopolysiloxane has more than 5% by weight of the cyclic low molecular weight siloxane having 10 or less silicon atoms, the volatile low molecular weight siloxane content in the siloxane polymer after the condensation polymerization is 5% by weight. And the problem of deterioration of the working environment due to volatile siloxane after emulsion coating may occur. Accordingly, it is necessary to use a product in which the amount of low molecular weight siloxane is adjusted to 5% by weight or less, more preferably 3% by weight or less. Furthermore, if n is less than 10, it is difficult to adjust the content of cyclic low molecular weight siloxane having 10 or less silicon atoms to 5% by weight or less, and if it is more than 200, the storage stability when emulsified becomes poor. It is necessary that 10 ≦ n ≦ 200.
[0009]
The functional group-containing organoalkoxysilane as the component (B) in the present invention is, for example, represented by the following formula (2).
R ^l R ² _n Si (OR ³ ) _3-n ……………… (2)
Here, R ¹ is an organic group containing an amino group, an epoxy group, a mercapto group or the like.
Examples of the amino group-containing organic group include (CH ₂ ) _a — (NR ⁴ —CH ₂ CH ₂ ) _b NR ⁵ R ⁶ , wherein R ⁴ , R ⁵ , and R ⁶ are a hydrogen atom and 1 to 10 carbon atoms. At least one is a hydrogen atom, a is an integer of 1 to 6, b is an integer of 0 to 3, R ² is a monovalent hydrocarbon group of 1 to 20 carbon atoms, R ³ is carbon A monovalent hydrocarbon group of 1 to 6, n is an integer of 0 to 2.
[0010]
Specific examples of the amino group-containing organoalkoxysilane as the component (B) in the present invention include 3- (2-aminoethyl) aminopropyltrimethoxysilane, 3- (2-aminoethyl) aminopropyltriethoxysilane, 3-amino Examples include propyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3- (2-aminoethyl) aminopropyldimethoxymethylsilane, and 3-aminopropyldiethoxymethylsilane.
Specific examples of the epoxy group-containing organoalkoxysilane as component (B) in the present invention are 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyldiethoxymethylsilane, 2- (3,4-epoxycyclohexylethyl) ) Trimethoxysilane, 2- (3,4-epoxycyclohexylethyl) dimethoxymethylsilane and the like.
Specific examples of the (B) component mercapto group-containing organopolysiloxane include 3-mercaptopropyltrimethoxysilane and 3-mercaptopropyldimethoxymethylsilane. In the present invention, the partial hydrolysis-condensation product of the above organofunctional group-containing organoalkoxysilane and the organosiloxane oligomer having an organofunctional group-containing siloxane unit are added within a range that does not impair the purpose of the present invention. You may go.
[0011]
The blending amount of the organopolysiloxane of the component (A) and the organofunctional group-containing organoalkoxysilane of the component (B) is preferably 10 to 60% by weight, and this is less than 10% by weight or If it exceeds 60% by weight, the stability of the emulsion is lowered, which is not preferable. More preferably, it is 30 to 55% by weight. The amount of the organofunctional group-containing organoalkoxysilane as the component (B) is 0.1 to 20 parts by weight, preferably 1 to 10 parts by weight per 100 parts by weight of the organopolysiloxane as the component (A). is there. If the component (B) is less than 0.1 part by weight, the contribution of the organic functional group in the emulsion is low, and if it exceeds 20 parts by weight, it is not preferable because it is recovered without affecting the reaction with the component (A).
[0012]
The surfactant of component (C) in the present invention is for uniformly dispersing component (A) and component (B) in water, and is not particularly limited. For example, quaternary ammonium salt, alkyl Cationic surfactants such as amine acetates; Amphoteric surfactants such as alkylbetaines and alkylimidazolines; Nonionic surfactants such as polyoxyethylene alkyl ethers and polyoxyethylene fatty acid esters alone or in combination of two or more can do.
In particular, a cationic surfactant is preferred in the condensation polymerization of the present invention. Examples of the quaternary ammonium salt include alkyltrimethylammonium chlorides such as decyltrimethylammonium chloride, lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, and stearyltrimethylammonium chloride. Component (C) is blended in an amount of 0.1 to 10% by weight, but if this is less than 0.1% by weight, the emulsion becomes unstable, and if it exceeds 10% by weight, the resulting silicone emulsion has releasability and heat resistance. This is because of a decrease. More preferably, it is in the range of 0.5 to 5% by weight.
[0013]
Furthermore, in order to improve the stability of the silicone emulsion of the present invention obtained by emulsion polymerization, other nonionic surfactants, cationic surfactants, and amphoteric surfactants are added within a range that does not impair the object of the present invention. You may add after emulsion polymerization or after neutralization.
The organopolysiloxane emulsion of the present invention is obtained by emulsifying and dispersing an organosiloxane as described above in an aqueous medium in the presence of at least one selected from a cationic surfactant, an amphoteric surfactant, and a nonionic surfactant. And then subjected to condensation polymerization at a reaction temperature of 70 to 90 ° C., and then neutralized to pH 4 to 9. If the polycondensation reaction temperature is less than 70 ° C, the reaction is slow, and if it exceeds 90 ° C, the stability of the emulsion is lowered during the polycondensation reaction, so 70-90 ° C is required.
The average particle size of the emulsion after the initial emulsification needs to be 50 to 250 nm, preferably 100 to 220 nm. If the average particle size exceeds 250 nm, the emulsion is poor in stability, so that it is separated into two layers during the condensation polymerization reaction, and if it is less than 50 nm, the amount of surfactant necessary for emulsification increases, which is not practical.
[0014]
As the cationic surfactant, when using the quaternary ammonium salt-based surfactant, the organopolysiloxane emulsion obtained, the viscosity of the extraction oil is less 10,000 mPa · s. Furthermore, in order to obtain an organopolysiloxane latex having a viscosity of the extracted oil exceeding 10,000 mPa · s, it is necessary to add a small amount of a basic catalyst such as potassium hydroxide, sodium hydroxide or potassium siliconate [( A) 0.01 to 0.5 parts by weight per 100 parts by weight of component].
[0015]
The time for this polycondensation reaction is 1 to 100 hours, preferably 10 to 50 hours, and the reaction is preferably carried out still or under gentle stirring at about 1 to 100 rpm. By adding an acidic substance after the condensation polymerization reaction, the pH value is adjusted to 4 to 9 to neutralize. Even if this pH value is less than 4 or greater than 9, the long-term stability of the resulting silicone emulsion is lowered, so that it is necessary to have a pH of 4 to 9, and preferably a pH of 5 to 8. Examples of the acidic substance added at this time include organic acids such as formic acid, acetic acid, lactic acid, malonic acid and glycolic acid, and inorganic acids such as hydrochloric acid, sulfuric acid and phosphoric acid.
[0016]
In order to obtain the organopolysiloxane emulsion of the present invention, the average particle size of the initial emulsion needs to be 50 to 250 nm. In order to obtain an average particle size in this range, a mixture of components (A) to (D) Must be emulsified under a high shear pressure of 50 to 300 MPa using a high-pressure emulsifier. If the shear pressure is lower than 50 MPa, it is difficult to make the average particle size of the resulting emulsion 250 nm or less, and even if it is higher than 300 MPa, the effect of reducing the average particle size further cannot be expected. A more preferred shear pressure is 70 to 200 MPa.
Examples of the high-pressure emulsifier include an ultra-high pressure Gaurin homogenizer, a microfluidizer, a nanomizer, and an optimizer (all are trade names). Prior to this high-pressure emulsification, rough emulsification using a homomixer, aji homomixer (trade name), a combination mixer (trade name), a colloid mill or the like is also optional.
[0017]
【Example】
Specific embodiments of the present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples. In addition, the viscosity in an Example is a value in 25 degreeC.
[0018]
<Example 1>
472 g of terminal dihydroxyorganopolysiloxane represented by the following formula (3) and having a cyclic low molecular weight siloxane content of 10 or less silicon atoms of 1.1% by weight, 14 g of 3- (2-aminoethyl) aminopropyltrimethoxysilane, To a mixture of 14 g of 3- (2-aminoethyl) aminopropyldimethoxymethylsilane, slowly add a mixture of 150 g of 30% by weight cetyltrimethylammonium chloride aqueous solution and 30 g of deionized water while stirring at 1,000 rpm with a homomixer. Phase-inverted. Next, after thickening this, the stirring speed was increased to 5,000 rpm and the mixture was stirred for 15 minutes, and then diluted with 320 g of deionized water. Subsequently, this was emulsified and dispersed once at 100 MPa with “Nanomizer LA-31 type” (manufactured by Nanomizer Co., Ltd.). The average particle size at this time was 190 nm when measured with a “Coulter N 4 Plus submicron particle size distribution analyzer (manufactured by Coulter, Inc.)”. The non-volatile content of this pre-condensation emulsion was 50.4% by weight at 105 ° C. for 3 hours. Next, this was subjected to a condensation polymerization reaction at 70 ° C. for 24 hours, and then adjusted to pH 7 by adding 8 g of acetic acid to obtain milky white “Emulsion A” having an average particle diameter of 180 nm. This emulsion A had a nonvolatile content of 48.8% by weight after heating at 105 ° C. for 3 hours, and a cyclic low molecular weight siloxane content of 3.1% by weight. Emulsion A showed excellent stability with no separation of the layers observed at room temperature for 1 month. 200 g of isopropyl alcohol was added to 100 g of this emulsion A, and the oil component was extracted, and the viscosity of the oil after drying was measured and found to be 2,900 mPa · s, amine equivalent 4, 330 g / mol. Table 1 shows the measured physical properties and evaluation results for Emulsion A.
H- [O-Si (CH ₃ ) ₂ ] ₄₀ -OH ………… (3)
[0019]
<Example 2>
The content of cyclic low molecular weight siloxane having 10 or less silicon atoms is 1.1% by weight, and a mixture of 472 g of terminal dihydroxyorganopolysiloxane represented by formula (3) and 28 g of 3- (2-aminoethyl) aminopropyltrimethoxysilane Then, 150 g of a 30 wt% aqueous solution of cetyltrimethylammonium chloride and 30 g of deionized water were gradually added dropwise while stirring at 1,000 rpm with a homomixer to cause phase inversion. After thickening this, the stirring speed was increased to 5,000 rpm, stirring was performed for 15 minutes, and then 320 g of deionized water was added for dilution. Subsequently, this was emulsified and dispersed once at 100 MPa with “Nanomizer LA-31 type” (manufactured by Nanomizer Co., Ltd.). The average particle size at this time was 190 nm when measured with a “Coulter N 4 PIus submicron particle size distribution analyzer (manufactured by Coulter, Inc.)”. The nonvolatile content of this pre-condensation emulsion was 50.0% by weight at 105 ° C. for 3 hours. This was subjected to a condensation polymerization reaction at 70 ° C. for 24 hours, and then adjusted to pH 7 by adding 8 g of acetic acid to obtain milky white “Emulsion B” having an average particle diameter of 180 nm. Emulsion B had a non-volatile content of 48.7 wt% after 3 hours at 105 ° C. The cyclic low molecular weight siloxane content was 2.4% by weight. Even when the emulsion was allowed to stand at room temperature for 1 month, no layer separation was observed, and the emulsion showed excellent stability. When 200 g of isopropyl alcohol was added to 100 g of this emulsion B to extract the oil component and the viscosity of the oil after drying was measured, it was 11, OOOmPa · s and an amine equivalent of 4,140 g / mo1. Table 1 shows the measured physical properties and evaluation results for Emulsion B.
[0020]
< Reference Example 1 >
The content of cyclic low molecular weight siloxane having 10 or less silicon atoms is 1.1% by weight, 472 g of terminal dihydroxyorganopolysiloxane represented by formula (3), 14 g of 3- (2-aminoethyl) aminopropyltrimethoxysilane, 3- To a mixture of 14 g of (2-aminoethyl) aminopropyldimethoxymethylsilane, 150 g of 30% by weight cetyltrimethylammonium chloride aqueous solution and 30 g of deionized water were gradually added dropwise with stirring at 1,000 rpm with a homomixer to cause phase inversion. After thickening this, the stirring speed was increased to 5,000 rpm, and the mixture was stirred for 15 minutes, and then diluted with 300 g of deionized water. Subsequently, this was emulsified and dispersed twice at a pressure of 100 MPa using a super high pressure Gaurin homogenizer “LAB40-10RBFI” (manufactured by APV Gorin). The average particle size at this time was 200 nm when measured with a “Coulter N 4 PIus submicron particle size distribution analyzer (manufactured by Coulter, Inc.)”. The non-volatile content of this pre-condensation emulsion was 51.0% by weight at 105 ° C. for 3 hours. To this emulsion, 20 g of a 10 wt% aqueous potassium hydroxide solution was added and subjected to a condensation polymerization reaction at 70 ° C. for 72 hours, and then 10 g of acetic acid was added to adjust the pH to 8 to obtain a milky white “Emulsion C” having an average particle size of 210 nm. It was. Emulsion C had a non-volatile content of 47.1 wt% after 3 hours at 105 ° C. The cyclic low molecular weight siloxane content was 7.7% by weight. Emulsion C exhibited excellent stability with no separation of layers observed at room temperature for 1 month. 200 g of isopropyl alcohol was added to 100 g of this emulsion, the oil component was extracted, and the viscosity of the oil after drying was measured to be 280,000 mPa · s and an amine equivalent of 4,630 g / mol. The measured physical properties and evaluation results for Emulsion C are shown in Table 1.
[0021]
< Reference example 2 >
The content of cyclic low molecular weight siloxane having 10 or less silicon atoms is 1.1% by weight, and 30% by weight in a mixture of 472 g of terminal dihydroxyorganopolysiloxane represented by formula (3) and 28 g of γ-glycidoxypropyltrimethoxysilane 150 g of cetyltrimethylammonium chloride aqueous solution and 30 g of deionized water were gradually added dropwise with stirring at 1,000 rpm with a homomixer to cause phase inversion. After thickening, the stirring speed was increased to 5,000 rpm and stirring was performed for 15 minutes, and then 300 g of deionized water was added for dilution. Subsequently, this was emulsified and dispersed twice at a pressure of 100 MPa using a super high pressure Gaurin homogenizer “LAB40-10RBFI” (manufactured by APV Gorin). The average particle size at this time was 180 nm when measured with a “Coulter N 4 PIus submicron particle size distribution analyzer (manufactured by Coulter, Inc.)”. The non-volatile content of the pre-polymerization emulsion was 51.0% by weight at 105 ° C. for 3 hours. To this emulsion, 20 g of 10% aqueous potassium hydroxide solution was added, a condensation polymerization reaction was performed at 70 ° C. for 72 hours, and then 2.5 g of acetic acid was added to adjust the pH to 7. As a result, milky white “Emulsion D” having an average particle diameter of 190 nm was obtained. It was. Emulsion D had a non-volatile content of 47.5% by weight after 3 hours at 105 ° C. The cyclic low molecular weight siloxane content was 6.9% by weight. Emulsion D showed excellent stability with no separation of the layers observed at room temperature for 1 month. 200 g of isopropyl alcohol was added to 100 g of this emulsion, the oil component was extracted, and the viscosity of the oil after drying was measured to be 850,000 mPa · s. Table 1 shows the measured physical properties and evaluation results of Emulsion D.
[0022]
<Comparative Example 1>
<Example 1> Milky white in the same manner as in Example 1, except that “Nanomizer LA-31 type” was changed to Gaurin homogenizer “15M-8TA” (manufactured by APV Gorin), and the pressure 100 MPa was changed to 30 MPa. An emulsion was obtained. The average particle size at the time of this emulsification dispersion was 310 nm and was subjected to a condensation polymerization reaction at 70 ° C. for 24 hours in the same manner as in <Example 1>. . Neutralization was performed under the same conditions as in Example 1 to obtain milky white “Emulsion E” having an average particle size of 300 nm. Emulsion E was separated at room temperature for 7 days after standing for 7 days. 200 g of isopropyl alcohol was added to 100 g of the emulsion E to extract the oil component, and the viscosity of the oil after drying was measured. As a result, the polymer was hardly polymerized and was 200 mPa · s. Table 1 shows the measured physical properties and evaluation results of Emulsion E.
[0023]
<Comparative Example 2> In <Example 3>, the terminal dihydroxyorganopolysiloxane represented by the formula (3) was changed to octamethylcyclotetrasiloxane, and an ultra-high pressure Gaurin homogenizer “LAB40-10RBFI” (manufactured by APV Gorin) 100 MPa A milky white “Emulsion F” was obtained in the same manner as <Example 3> except that the pressure was changed to 30 MPa. The nonvolatile content of the pre-polymerization emulsion was 46.6% by weight at 105 ° C. for 3 hours. The average particle size of the emulsion after polymerization was 270 nm, the nonvolatile content after 3 hours at 105 ° C. was 41.3 wt%, and the cyclic low molecular weight siloxane content was 10.5 wt%. The oil component was extracted by adding 200 g of isopropyl alcohol to 100 g of the emulsion F, and the viscosity of the oil after drying was measured to be 95,000 mPa · s. The measured physical properties and evaluation results for Emulsion F are shown in Table 1.
[0024]
100 g of a treatment liquid having an active ingredient content of 0.7% by weight of the emulsion of the present invention was prepared and spray-coated on 20 g of 6 denier x 64 mm polyester staple cotton to a wet pick-up rate of 100%. Heat treatment for a minute. The slidability and flexibility of the obtained treated cloth were evaluated by touch according to the following criteria.
Sliding property ○: Very good Δ: Pretty good ×: Bad flexibility ○: Very good Δ: Pretty good ×: Poor The cyclic low molecular weight siloxane content was calculated by the following formula (4).
Cyclic low molecular weight siloxane content = 100 × (Nonvolatile content of emulsion before polycondensation−Nonvolatile content of emulsion after polycondensation) / 50 …………………… (4)
[0025]
[Table 1]

[0026]
【The invention's effect】
According to the present invention, a functional group-containing organopolysiloxane emulsion excellent in stability can be produced.

Claims (3)

An emulsion containing the following (A) to (D) is emulsified and dispersed so as to have an average particle size of 50 to 250 nm to obtain an initial emulsion, which is subjected to condensation polymerization in the absence of a catalyst, and then neutralized. A method for producing an organopolysiloxane emulsion.
(A) The following general formula (1)
H- [O-Si (R) ₂ ] _n- OH. . . . . . . . . . . . (1)
Wherein R is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms, n is an integer satisfying 10 ≦ n ≦ 200, and the number of silicon atoms is 10 or less. Terminal hydroxyorganopolysiloxane having a cyclic low molecular weight siloxane content of 5% by weight or less,
(B) a functional group-containing organoalkoxysilane,
(C) a cationic surfactant,
(D) Water.   The process for producing an organopolysiloxane emulsion according to claim 1, wherein the emulsification dispersion for obtaining the initial emulsion is carried out under a high shear pressure of 50 to 300 MPa.   3. The method for producing an organopolysiloxane emulsion according to claim 1 or 2, wherein the functional group of component (B) is selected from an amino group, an epoxy group, and a mercapto group.