JPS627438A - Self-emulsifiable silicone composition - Google Patents

Abstract

PURPOSE:To enhance the high temp. stability of a diluted solution, by com pounding specific methylhydrodiene polysiloxane, an oxyalkylene compound, an unsaturated hydrocarbon compound, liquid dimethylpolysiloxane and a plati num catalyst. CONSTITUTION:2-35pts.wt. of methylhydrodiene polysiloxane represented by formula (wherein R<1> is H or a 1-6C monovalent hydrocarbon group and m and n are a positive integer), 20-80pts.wt. of an oxyalkylene compound with MW of 200-6,000 represented by formula II (wherein R<2> is a 1-16C divalent org. group and R<3> is a hydroxyl group or an acetyl group), 0-10pts.wt. of a 5-20C unsaturated hydrocarbon compound having a vinyl group at the molecular chain terminal, 1-35pts.wt. of a mixture of 85-98pts.wt. of liquid dimethylpolysiloxane having viscosity of 20cs or more at 25 deg.C and 15-2pts.wt. of powdery silica and 0.0001-0.5pt.wt. of a platinum catalyst are compounded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a self-emulsifying silicone composition, particularly one that is self-emulsifying even when diluted with water, and has excellent high temperature stability and mechanical properties even when diluted with water. Demonstrates stability and prevents cissing and oil spills.
The present invention relates to a self-emulsifying silicone composition that is useful as an antifoaming agent, a mold release agent, a fiber treatment agent, a cosmetic additive, and a foam stabilizer for polyurethane production, without any problems such as -.

(Prior art) Polyoxyalkylene-modified polysiloxane is water-soluble and has excellent physical and chemical stability, so it is used as an antifoaming agent, mold release agent, fiber treatment agent, cosmetic additive, and in the production of foamed polyurethane. It is widely used as a foam stabilizer.

However, this product is inferior in antifoaming properties, mold release properties, water clarity, and gloss properties compared to products whose main ingredient is ordinary diorganopolysiloxane. It has the disadvantage of not exhibiting a foaming effect. Therefore, ``polyoxyalkylene-modified polysiloxane may be blended with dimethylpolysiloxane,
Alternatively, antifoam compositions containing silica fillers and siloxane resins have also been proposed, which are particularly useful for antifoaming during high-temperature jet dyeing, antifoaming for water-based cutting oils, and for paintability, such as in paints and inks. This product is used for applications that require a high degree of water dispersibility and mechanical properties after dilution by increasing the addition ratio of dimethylpolysiloxane, a foam-inhibiting component, silica filler, and siloxane resin. On the other hand, if the addition ratio of polyoxyalkylene-modified polysiloxane is increased, the dilution stability improves, but the defoaming effect deteriorates.

Therefore, in order to improve such defects, a silicone resin is added as a dispersion aid to a base composition consisting of a foam suppressing component consisting of dimethylpolysiloxane, a silica filler, and a siloxane resin, and a polyoxyalkylene-modified polysiloxane. A composition containing a condensation reaction product with polyoxyethylene or polyoxypropylene is effective for defoaming in jet dyeing processes that require high-temperature properties and mechanical stability (Japanese Patent Application Laid-Open No. 49-25283). (see Japanese Patent Publication No. 19836/1983), and foam-inhibiting compositions for carpet dyeing processes in which dimethylpolysiloxane whose molecular chain ends are blocked with hydroxyl groups is added to the above base composition (see Japanese Patent Publication No. 19836/1983); A composition in which a polyoxyalkylene-modified siloxane resin is added as a dispersant (see Japanese Patent Publication No. 52-22638), and a composition in which two types of polyoxyalkylene-modified polysiloxane are used as a dispersant (Japanese Patent Application Publication No. 1987-22638) (Refer to Publication No. 149388/1983) have been proposed. Polyoxyalkylene-modified polysiloxanes include polyoxyalkylene-modified polysiloxanes that have improved mechanical stability and storage stability by combining low and high HLB materials (see Japanese Patent Publication No. 54-43015), polyoxyalkylene-modified polysiloxanes and α -Olefin-modified polysiloxanes have been proposed to improve storage stability (see JP-A-54-149388), but in all of these, the components agglomerate with each other, resulting in layer separation. Attention has been focused on how to solve the drawback of causing However, in the conventional method, each component is adjusted separately and finally dispersed and mixed using a dispersion machine such as a homomixer or homogenizer to obtain a composition, which results in poor storage stability and mechanical stability after dilution. It naturally had its limits.

(Structure of the Invention) The present invention relates to a self-emulsifying silicone composition that solves the above-mentioned disadvantages. unsubstituted or substituted-valent hydrocarbon group, m and n are positive integers.

Tazoshi n = 1-70, m + n = 5-5
00) 2 to 35 parts by weight of methylhydrodiene polysiloxane, 2) General formula %) (where R2 is a divalent organic group having 1 to 16 carbon atoms, R3 is a hydroxyl group, an acetyl group, a carbon number 1 to 20 alkoxy groups,
A group selected from isocyanate groups, R4 is a hydrogen atom or a methyl group, a=4-60, b=.

~60 and the average molecular weight represented by a+b24~75) is 2
Oxyalkylene compound 20-6,000
80 parts by weight, 3) 0 to 10 parts by weight of an unsaturated hydrocarbon compound having 5 to 20 carbon atoms having a vinyl group at the end of the molecular chain, 4)
1 to 35 parts by weight of a foam suppressor consisting of 85 to 98 parts by weight of liquid dimethylpolysiloxane having a viscosity of at least 20 cS at 25°C and 15 to 2 parts by weight of finely powdered silica; 5) a platinum-based catalyst from 0.00001 to 0; .5 parts by weight.

In other words, the present inventors have developed a self-emulsifying product that is self-emulsifying even when diluted with water, that the diluted liquid exhibits excellent high temperature stability and mechanical stability, and that does not cause troubles such as cissing and oil spots. As a result of various studies on emulsifiable silicone compositions, we found that the polyoxyalkylene component that acts as a dispersant in this type of composition is the first one described above.
Assuming that a polyoxyalkylene-polysiloxane block copolymer is an addition reaction product of methylhydrodiene polysiloxane as a component and an oxyalkylene compound as a second component, this copolymer is composed of dimethylpolysiloxane and finely powdered silica. It forms an intimate mixture with the foam suppressor and has significantly improved storage stability on its own, and it self-emulsifies easily even when diluted in water and is quenchable when used in a foaming system. This block copolymer is capable of increasing dilution stability and preventing the occurrence of oil spots without reducing the foaming effect, and this block copolymer can be used when the first component and the second component are in the presence of the fifth component during the production of the above-mentioned composition. Since it is easily formed, there is no need to synthesize it separately, and the process can be greatly streamlined.

In addition, this block copolymer is compatible with dimethylpolysiloxane, and the occurrence of repellency and oil spots due to organic groups present in this processing solution can be prevented by introducing hydrocarbon groups that have an affinity for this. Based on this discovery, the present invention was completed by conducting research on the composition and blending ratio of each component constituting the composition of the present invention.

The methylhydrodiene polysiloxane as the first component constituting the composition of the present invention is represented by the general formula (%), where R1 is a hydrogen atom or an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, etc. aryl groups such as phenyl groups, or chloromethyl groups, trifluoropropyl groups, cyanomethyl groups, etc. in which part or all of the hydrogen atoms bonded to the carbon atoms of these groups are substituted with halogen atoms, cyano groups, etc. carbon number 1~
6 unsubstituted or substituted monovalent hydrocarbon group, m and n are known positive integers, but this one is m + n
If the degree of polymerization is 5 or less, the antifoaming property will be poor and the dispersion stability will not be improved.
Since the reaction with the third component will not proceed well, this m
+n must be in the range of 5 to 500, and this n
If the molecular weight exceeds 70, the reaction system will become unstable and gelation will occur easily, and the amount of hydrogen generated in one reaction will increase, leading to the risk of ignition and explosion, so it is necessary to set the value within the range of 1 to 70.

Next, the oxyalkylene compound as the second component is represented by the general formula (%), where R2 is an alkylene group having 1 to 16 carbon atoms such as methylene, ethylene, propylene, butylene, etc.
A divalent organic group such as CO-1-CONH-1, R3 is a hydroxyl group, an acetyl group, an alkoxy group having 1 to 20 carbon atoms, an end-blocking group such as isocyanate, and R4 is a hydrogen atom or a methyl group. and a is 4 to 60, preferably 8 to
30, b is an integer of O to 60, preferably O to 30, and a+
b=4 to 75, and E=Sill in the methylhydrodiene polysiloxane as the first component described above in the presence of a platinum-based catalyst as the fifth component described later.
Since it undergoes an addition reaction with a bond to form a polyoxyalkylene-polysiloxane block copolymer, it must have an aliphatic unsaturated group at the end of its molecular chain as shown in the above formula. This thing has a molecular weight of 200
If it is less than 6,000, the composition will not show sufficient hydrophilicity and its antifoaming performance will be poor, and if it exceeds 6,000, the viscosity will increase and the workability will be poor.
a, b, and R2 are selected appropriately so that the molecular weight is 200 to 6,
000 is required.

In addition, the hydrocarbon compound as the third component undergoes an addition reaction with the first component in the presence of the fifth component together with the second component described above to produce a hydrocarbon-modified siloxane, thereby imparting lipophilic properties to the composition. Since it imparts paintability, it is necessary to have a vinyl group at the end of the molecular chain that reacts with the first component + 7).If the number of carbon atoms is 5 or less, paintability is There is no imparting effect, and if it exceeds 20, the antifoaming property becomes poor, so it is necessary to use a carbon number of 5 to 20. However, it is not necessary to add this third component, and the composition of the present invention has excellent stability even without the addition of this third component,
? 'F4 shows foaming and dispersibility, but if it contains this third component, stability and paintability will be further improved, and the preferred range is 0.5 to 10 parts by weight. Addition of 10 parts by weight or more is not preferable because storage stability tends to deteriorate.

In addition, the above-mentioned first component to third component are E in the first component.
This is an addition reaction between the SiH bond and the unsaturated groups in the second and third components, and the amount of unsaturated groups in the second and third components is 0. , 8 or more, there are too many 9Sill bonds and it becomes easy to gel, and 2.0
If the amount exceeds 0.00, the antifoaming properties will deteriorate, so the strained sushi should be 0.
It is preferable that the number is in the range of 8 to 2.0 pieces.

Next, the foaming inhibitor as the fourth component constituting the composition of the present invention is a known one, and is made from dimethylpolysiloxane and finely powdered silica, and this dimethylpolysiloxane has a sufficient antifoaming effect. In order to demonstrate
A viscosity of at least 20 cS at 5°C is required. There is no upper limit to the viscosity of this dimethylpolysiloxane, and it may be up to 1,000,0000 cS or higher, but in view of workability and dispersibility, it is best to keep it below 5,000 cS, and the molecular chain terminal is a trimethylsilyl group. , hydroxyl group, or alkoxy group. Further, the fine powder silica used here may be either dry silica or wet silica, and examples thereof include precipitated silica, silica xerogel, fumed silica, and silica whose surface is treated with an organic silyl group. , specifically, Erosil (trade name manufactured by Nippon Aerosil Co., Ltd.), Nibusil (trade name manufactured by Nippon Silica Co., Ltd.), Cabosil (trade name manufactured by Cabot Co., Ltd. in the United States), Santocel (trade name manufactured by Monsando Co., Ltd. in the United States), and Degussa (trade name manufactured by Degussa Co., Ltd. in the United States). (trade name), but these preferably have a specific surface area of 50 m/g or more as measured by the BET method. In addition, this foaming inhibitor is made by adding 15 to 98 parts by weight of the above-mentioned silica to 85 to 98 parts by weight of the above-mentioned dimethylpolysiloxane.
It can be obtained by blending ~2 parts by weight.

Further, the platinum-based catalyst as the fifth component has an =siH bond in the first component and a platinum-based catalyst as the fifth component. It serves as a catalyst for causing an addition reaction with the terminal unsaturated group in the third component,
These include platinum black, platinum supported on silica, etc.
Furthermore, chloroplatinic acid, alcohol compounds or aldehyde compounds of chloroplatinic acid, chloroplatinic acid and various olefins,
Examples include complex salts with vinyl siloxane, which can be added in a catalytic amount; specifically, 0.00% to the total of the first to third components described above. lppm or more, preferably 1 to 5
The range is 0.00001 to 0.5 parts by weight, which is 0 PPm.

The composition of the present invention can be obtained by mixing predetermined amounts of the first to fifth components described above, which are then heated at a temperature of 40 to 250°C, preferably 60 to 180°C for 2 to 60 hours. The heat treatment is preferably carried out while stirring and mixing for 4 to 20 hours. This product may then be mixed uniformly using a mixer such as a colloid mill or a homomixer, if necessary. In this case, in order to further improve the dispersibility, a conventional emulsifier, such as sorbitan fatty acid ester, may be used. Fatty acid esters of polyoxyalkylene compounds, ethylene oxide-propylene oxide block copolymers, and the like may be optionally used within the range that does not impair the object of the present invention. Note that in the above heat treatment, if the above composition is dissolved in an organic solvent and then heat treated, the reaction between the first component and the second and third components can be made more effective. Examples of organic solvents include aliphatic hydrocarbons, aromatic hydrocarbons, chlorinated hydrocarbons,
Alcohol-based solvents can be used.

Specific examples include benzene, toluene, xylene, n-paraffin, ethanol, isopropyl alcohol, and petroleum ether.

Next, examples of the present invention will be given. Parts in the five examples are parts by weight, and viscosity is the measured value at 25°C. The properties, mechanical stability, etc. are the results of tests conducted using the methods described below.

(Defoaming test using latex) 1.5% of SBR latex (active ingredient 50%) was placed in a 200mQ cylinder with a stopper. Weigh out OOg and add 1 antifoaming agent to it.
, 000 ppm was added and shaken by hand for 30 seconds, and the time-dependent change in the lifting height was measured.

(Paintability test using latex) The latex tested in the above defoaming test was applied to glassine paper using a wire bar, dried, and marked with red marker ink to observe the degree of repellency.

Evaluation method: ◎: Same as blank (no antifoaming agent added); ○: Some repellency is observed; △: Many repellents are present; ×: Innumerable repellents are present.

(Anti-foaming test using staining liquid) In a 1.000 mQ measuring cylinder, add 100 parts of staining liquid (composition - Tetrosin R0, 25 parts, Demol RNL 0.1 part, Toho Salt A-10 No. 1 part, water 99.5 parts).
g, and add 1100pp of antifoaming agent as a sample to it.
After adding the mixture, the temperature was raised to 80°C, and the mixture was passed through a glass pole filter.1. 8. The amount of bubbles was measured when aerating at a rate of OQ 1 minute.

(Oil spot test) In a 300mQ glass beaker, add 5% of the antifoaming agent as a sample to the above dyeing solution, weigh out 200g of the dispersed solution, heat it to 130'C for 30 minutes, and then bring it to room temperature. Cool and check whether or not there are oil spots at that time.

Evaluation method O: Almost no oil spots were observed.

△...A few small oil spots are observed.

X: A large oil spot is observed.

(Storage Stability Test) 100 g of the sample was weighed into a glass bottle and left to stand in a constant temperature bath at 40° C., and the storage state of each bottle was observed after 10, 20, and 30 days.

Evaluation method: No separation even after 30 days, O...20
Separated in ~30 days.

Δ...Separated in 10 to 20 days.

X: Separated within 10 days.

(High temperature stability test of diluted solution) Sample Log was diluted and dispersed in 90 g of water, placed in a 200 mQ beaker, and heated at 130°C for 30 min in a high temperature sterilizer.
After heating for a minute, the mixture was allowed to cool to room temperature, and this state was observed, as well as the state of redispersion by stirring gently with a spatula.

Evaluation method ◎...No oil floating or dirt on the wall surface, easily redispersed. ○...Some oil floating or dirt on the wall surface, but easily redispersed. Δ...No oil floating or dirt on the wall surface. There is dirt and some parts do not re-disperse, ×...There is oil floating and dirt on the wall surface, and some parts do not re-disperse.

(Mechanical stability test of diluted solution) Dilute and disperse 20 g of sample in 180 g of water, place in a 300 mQ beaker, and mix at 7.000 rpm using a homomixer.
After stirring at high speed for 10 minutes at m, the state was observed.

Evaluation method: ◎... There is almost no oil floating or dirt on the wall, ○.
...There is no oil floating, but the wall surface is a little dirty, △... There is some oil floating, and the wall surface is also dirty, X... There is a lot of oil floating.

(Defoaming test at room temperature) 0.2% sodium oleate aqueous solution 1001+Iρ
The internal volume is 1. After weighing into an OOOmQ graduated cylinder, 1 mQ of a 10% dispersion of the composition obtained in the example was added to it, and then air was continuously introduced at a rate of 1111/min through a glass pole filter. Changes in the amount of foaming over time were investigated.

(Defoaming test at high temperature) 0.3% polyoxyethylene nonylphenyl ether Emulgen 909 (Kao Soap Co., Ltd. trade name aqueous solution 2)
00mQ is the internal volume 1. Weigh it into a measuring cylinder of OOOmfl, and add 10% aqueous dispersion of the composition obtained in Example 0.
．． 02ts I2 (10pp1m) was added, then the temperature was raised to 80°C, and then air was continuously introduced at a rate of IQZ through a glass pole filter, and the change in foaming amount over time was observed. Ta.

Example 1, Comparative Example 1 The following three types of methylhydrodiene polysiloxane were used as the first component, and the following three types of polyoxyalkylene compounds 0A-1 were used as the second component. C112=CHC1120(C2H,O)2□(C3H
,o)z ,COCH3,0A-2 C12=C1lCH20(C2H4o)6 (Cil(
sO)z*I(,0A-3 CI.

CH2=CC00(C2H,O)3°C411,, and at the same time select 1-octene (C++t
lzs) or 1-decene (czaoza),
As the fourth component, dimethylpolysiloxane (with a viscosity of 1.000 cS) whose molecular chain terminals are blocked with trimethylsilyl groups (
DMS-1) or dimethylpolysiloxane (DMS-2) with a viscosity of 500 cS whose molecular chain terminals are capped with monohydroxydimethylsilyl groups and finely powdered silica nibsil L
P (product name manufactured by Nippon Silica Co., Ltd.) or Aerosil-300
(trade name manufactured by Nippon Aerosil Co., Ltd.), and these
Mix the amounts shown in the table, charge each into 20 three-necked flasks, heat to 80°C while stirring and mixing, and then add the alcohol compound of chloroplatinic acid (platinum amount: 2% by weight).
0.5 part was added, the temperature was raised to 120°C, and the reaction was carried out by heating for 8 hours. Then, this reaction composition was dispersed for 30 minutes using a homogenizer at a rotation speed of 5.500 rpm. A pale brown opaque liquid A-F was obtained.

Table 1 Also, for comparison, the amounts of methyl hydrodiene polysiloxane M HS-1 to 3 and polyoxyalkylene compounds POA 1 to 3 and 1-decene used in the above examples are shown in Table 2. Then, 800 parts of isopropyl alcohol, 1.0 part of potassium acetate, and 0.5 part of an alcohol compound of chloroplatinic acid were added to the mixture, and the mixture was reacted under reflux at a temperature of 80 to 90°C. , removing the solvent at a temperature of 120° C. under a reduced pressure of 10 nnHg to obtain polyoxyalkylene-modified opolysiloxane ■～■
The dimethylpolysiloxane (DMS-1 to 2) used in the above examples and finely powdered silica were added to this in the amounts shown in Table 3, heated at 60°C, and then mixed using a homomixer. The compositions were mixed and dispersed by rotating at 5.5'00 rpm for 30 minutes to prepare compositions A' to E' shown in Table 3.

Table 2 Table 3 Next, we investigated the antifoaming properties, vain tuple properties, and dispersibility of the 11 compositions A-F and A' to E' obtained above using latex, as shown in Table 4. The results shown in Table 5 were obtained when the antifoaming properties and oil spot properties of these dyes were examined.

Example 2. Comparative Example 2 The following three types of methylhydrodiene polysiloxane were used as the first component. ~3 and dimethylpolysiloxane D used in Example 1 as the fourth component.
MS-1 and 2, distyl polysiloxane (DMS-3) with a viscosity of 100 cS whose molecular chain ends are capped with monohydroxydimethylsilyl groups, and dimethyl polysiloxane (DMS-3) with a viscosity of 50 cS whose molecular chain ends are capped with monoethoxydimethylsilyl groups. Using a foaming inhibitor in which the finely powdered silica Nibsil LP or Aerosil 300 used in Example 1 was added to siloxane (DMS-4), these were mixed in the amounts shown in Table 6 and heated to 80°C. Then, 0.5 part of an alcohol compound of chloroplatinic acid (platinum amount: 2% by weight) was added thereto, the temperature was raised to 120'C, and the reaction was carried out by heating for 8 hours.
This reaction composition was then mixed at 5,50% using a homomixer.
When the mixture was dispersed and mixed for 30 minutes at a rotational speed of 0 rpm, a pale brown opaque liquid GM shown in Table 6 was obtained.

In addition, for comparison, methylhydrodiene polysiloxane M I-I S-4 used in Example 2 of Twelve
, 5 and polyoxyalkylene compounds 1) OA-1 to OA-3 as shown in Table 7 were mixed and charged into a 3Q three-loaf flask, and this was mixed with isopropyl alcohol and potassium acetate 1.
．． 0 part and 0.5 part of an alcohol compound of chloroplatinic acid (platinum amount 2% by weight) were added and reacted under reflux at a temperature of 80 to 90°C.
The solvent was removed at 0°C to produce polyoxyalkylene-modified polysiloxanes ■ to The agent was added in the areas shown in Table 8, heated to 60°C, and then mixed using a homomixer.
The compositions were mixed and dispersed by spinning at 500 rpm I11 for 30 minutes to prepare compositions F' to J' shown in Table 8.

Table 8: Next, the storage stability, high temperature stability, machine J stability, and antifoaming property at room temperature of the two compositions G-M and F' to J' obtained above were investigated. showed the results as shown in Table 9, and when the antifoaming properties of these 7 at high temperatures were investigated, the results shown in Table 10 were obtained.

Table 10 Procedural Amendment Band August 1, 1985 1. Indication of the case 1985 Patent Application No. 1464.06 2. Name of the invention Self-emulsifying silicone composition 3. Person making the amendment Relationship to the case Patent Applicant name (206) Shin-Etsu Chemical Co., Ltd. “Sponsored” 6. Subject of amendment 7゜ Contents of amendment 1) “Claims” from page 1, line 4 of the specification tube to page 2, line J1, as shown in the attached sheet. Correct to.

2) "Dilution" on page 4, line 1 of the specification should be corrected to "dilution."

3) "The second component" in line 2 on page 8 of the specification is corrected to "J from [second component"], and "can be rationalized.J" in line 4 on the same page is changed to [
"It can be rationalized," he corrected.

4) Correct "n-chi" on page 9, line 9 of the specification to "n-value".

5) In page 14, line 10 of the specification, "dispersibility is made" is corrected to "dispersibility is further".

6) Amend "Product name" on page 19, line 9 of the specification to "Product name)".

Claim 1, ]) General formula % Formula %) (R1 is a hydrogen atom or an unsubstituted or substituted hydrocarbon group having 1 to 6 carbon atoms, m and n are positive integers, provided that n
= 1-70, m + n = 5-500)
Methylhydrodiene polysiloxane 2-3 represented by
5 parts by weight.

2) General formula % formula % (in this 2, R2 is a divalent organic group having 1 to 16 carbon atoms, R3 is a hydroxyl group, an acetyl group, an alkoxy group having 1 to 20 carbon atoms,
A group selected from isocyanate groups, R4 is a hydrogen atom or a methyl group, a=4 to 60, b=o to 60, and a=4
The average molecular weight represented by ~75) is 200 to 6,000
20 to 80 parts by weight of an oxyalkylene compound, 3) 0 to 10 parts by weight of an unsaturated hydrocarbon compound having 5 to 20 carbon atoms having a vinyl group at the end of the molecular chain, 4) 25
85 to 98 parts by weight of liquid dimethylpolysiloxane having a viscosity of at least 20 cS at °C and 15 parts by weight of finely powdered silica.
-2 parts by weight of a foaming inhibitor
1 to 35 parts by weight, 5) platinum catalyst
A self-emulsifying silicone composition comprising 0.00001 to 0.5 parts by weight.

Claims (1)

[Claims] 1,1) General formula R^1(CH_3)_2SiO [(CH_3)_2Si
O]_m[(CH_3)HSiO]_nSi(CH_3
)_2R^1 (here, R^1 is a hydrogen atom or a carbon number of 1
~6 unsubstituted or substituted monovalent hydrocarbon groups, m and n are positive integers, n = 1 to 70, m + n = 5 to 500) 2 to 35 parts by weight of methylhydrodiene polysiloxane, 2) General formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (Here, R^2 is a divalent organic group with 1 to 16 carbon atoms, R^
3 is a group selected from a hydroxyl group, an acetyl group, an alkoxy group having 1 to 20 carbon atoms, and an isocyanate group, R^4 is a hydrogen atom or a methyl group, a=4 to 60, b=0 to 60, and a+
The average molecular weight represented by b=4-75) is 200-6,0
3) 0 to 10 parts by weight of an unsaturated hydrocarbon compound having 5 to 20 carbon atoms having a vinyl group at the end of the molecular chain; 4) The viscosity at 25°C is at least 20 cS. 1 to 35 parts by weight of a foam suppressor consisting of 85 to 98 parts by weight of liquid dimethylpolysiloxane and 15 to 2 parts by weight of finely powdered silica; 5) 0.00001 to 0.5 parts by weight of a platinum catalyst. A self-emulsifying silicone composition.