JPH0653863B2 - Lubricant / release agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a lubricant / release agent, which is an aqueous dispersion of silicone rubber granules. The present invention relates to a lubricating / releasing agent which is an aqueous dispersion of a silicone rubber particulate having a characteristic of being able to impart excellent lubricity and releasing property to the surface of the base material when applied to the surface of the material.

[Prior Art] Conventionally, an aqueous dispersion containing silicone oil as a main component has been known and widely used as a lubricant or a release agent.

[Problems to be Solved by the Invention] However, when an aqueous dispersion containing silicone rubber oil as a main component is applied to the surface of various base materials, the surface of the base material becomes sticky, dust, and dusts are not generated. There is a problem that it is adsorbed and soiled, and there is a problem that lubricity or releasability is poor depending on the application.

The present invention is intended to solve such problems, and when it is applied to the surface of various base materials, it is possible to impart excellent lubricity and releasability to the surface of the base materials. Lubrication that is an aqueous dispersion of silicone rubber granules containing
To provide a release agent.

[Means for Solving Problems and Actions Thereof] The present invention includes (A) 100 parts by weight of water, (B) 1 to 35 parts by weight of a silicone rubber granular material having an average particle diameter of 0.1 to 1000 μm, and ( C) Surfactant The present invention relates to a lubricating / releasing agent, which is an aqueous dispersion of a silicone rubber granule comprising 0.05 to 10 parts by weight of a surfactant.

To explain this, the water of the component (A) used in the present invention is a medium for uniformly dispersing the silicone rubber particles, and is not particularly limited as long as it is water.

The (B) component silicone rubber granules used in the present invention are required to have an average particle diameter of 0.1 to 1000 μm, preferably 0.5 to 20 μm.
This is because when the average particle diameter is less than 0.1 μm, stickiness occurs, and when it exceeds 1000 μm, the storage stability as an aqueous dispersion is lost. The silicone rubber constituting such a silicone rubber granule is not particularly limited, and examples thereof include diorganopolysiloxane having hydroxyl groups at both ends of the molecular chain and organohydrogen having at least 3 silicon-bonded hydrogen atoms in one molecule. Condensation reaction curable silicone rubber obtained by dehydrogenative condensation reaction of polysiloxane in the presence of condensation reaction catalyst, organopolysiloxane having at least two alkenyl groups in one molecule, and at least two silicon in one molecule An addition-reaction-curable silicone rubber obtained by addition reaction of an organohydrogenpolysiloxane having an atom-bonded hydrogen atom in the presence of a platinum catalyst, and a diorganopolysiloxane having vinyl groups at both ends and / or side chains of a molecular chain. Radical obtained by radical reaction in the presence of organic peroxide Although 応硬 of silicone rubbers, 2's preferred pre ease of manufacture in the present invention. Take
The silicone rubber granules as the component (B) can be obtained by a number of methods, but it suffices that an aqueous dispersion of the silicone rubber granules with good storage stability can be finally obtained, and the manufacturing method thereof is not particularly limited. Specific examples of the method for producing the component (B) silicone rubber granules include the following methods.

(1) Organopolysiloxane containing at least two alkenyl groups represented by vinyl group in one molecule and organohydrogenpolysiloxane containing at least two hydrogen atoms bonded to silicon atoms in one molecule and platinum system A liquid addition reaction-curable silicone rubber composition comprising a compound catalyst is placed in water itself or water containing a surfactant, and the water itself or a water containing a surfactant is stirred to obtain the silicone rubber composition. It is dispersed in the form of fine particles to prepare an aqueous dispersion of the liquid silicone rubber composition, and then the aqueous dispersion is heated to cure the liquid silicone rubber composition, or the dispersion is heated to a temperature of 25 ° C. or higher. It is obtained by dispersing in water and curing the liquid silicone rubber composition into particles.

(2) Further, an organopolysiloxane having at least two hydroxyl groups at both ends of the molecular chain, an organohydrogenpolysiloxane having at least three hydrogen atoms bonded to silicon atoms in one molecule, and an organotin peroxide. A liquid condensation reaction-curable silicone rubber composition comprising a catalyst is placed in water itself or water containing a surfactant, and the water itself or the water containing a surfactant is stirred to obtain fine particles of the silicone rubber composition. To form an aqueous dispersion of the liquid silicone rubber composition, and then leave the aqueous dispersion as it is for a long period of time, or heat it, or submerge it in water heated to a temperature of 25 ° C. or higher. It is obtained by dispersing and curing the liquid silicone rubber composition into particles. The amount of the component (B) compounded is in the range of 1 to 35 parts by weight per 100 parts by weight of the component (A),
It is preferably in the range of 5 to 25 parts by weight. This is because if it is less than 1 part by weight, the amount of the component (B) becomes too small, and when it is applied to the surface of various base materials, it becomes impossible to impart lubricity and releasability to the surface of the base material. This is because if the amount exceeds 35 parts by weight, the storage stability of the silicone rubber granules as an aqueous dispersion decreases.

The surfactant of the component (C) used in the present invention functions to uniformly disperse the silicone rubber particles of the component (B) in water and to improve the storage stability of the aqueous dispersion of the present invention. To do.
The component (C) is a conventionally known surfactant or emulsifier known to be useful for forming a silicone oil emulsion, and is not particularly limited. Examples of such a surfactant include the following nonionic surfactants, anionic surfactants, and cationic surfactants, and among these, the nonionic surfactants are preferably used.

Nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyalkylene alkylphenols, polyoxyalkylene alkyl esters, polyoxyalkylene sorbitan esters, polyethylene glycols, polypropylene glycols, and ethylene oxide adducts of diethylene glycol trimethylnonanol. Is exemplified.

As the anionic surfactant, hexylbenzenesulfonic acid, octylbenzenesulfonic acid, decylbenzenesulfonic acid, dodecylbenzenesulfonic acid, cetylbenzenesulfonic acid, alkylbenzenesulfonic acid such as myristylbenzenesulfonic acid, CH ₃ (CH ₂ ) ₆ CH ₂ O (C ₂ H ₄ O) ₂ SO ₃ H CH ₃ (CH ₂ ) ₈ CH ₂ O (C ₂ H ₄ O) ₈ SO ₃ H CH ₃ (CH ₂ ) ₁₉ CH ₂ O (C ₂ H ₄ O) ₂ SO ₃ H CH ₃ (CH ₂ ) ₈ CH ₂ C ₆ H ₄ O (C ₂ H ₄ O) ₂ SO ₃ H is a sulfate ester of polyoxyethylene monoalkyl ether, alkylnaphthyl sulfonic acid It is illustrated.

As the cationic surfactant, octyltrimethylammonium hydroxide, dodecyltrimethylammonium hydroxide, hexadecyltrimethylammonium hydroxide, octyldimethylbenzylammonium hydroxide, decyldimethylbenzylammonium hydroxide, dioctadecyldimethylammonium hydroxide, beef tallow trimethyl. Examples include ammonium hydroxide, quaternary ammonium hydroxides such as coconut oil trimethylammonium hydroxide, and salts thereof.

The surfactants used in the present invention are not suitable depending on the type of silicone rubber and the method for producing the silicone rubber granules, and thus are suitable for the type of silicone rubber and the method for producing the silicone rubber granules. It is necessary to appropriately select and use a surfactant each time. For example,
An addition reaction-curable silicone rubber composition curable with a platinum catalyst as described in (1) above is discharged into water containing a surfactant and emulsified, and then the silicone rubber composition is cured to obtain a silicone rubber particulate material. In this case, a surfactant containing an atom that deactivates the platinum catalyst, such as a sulfur atom or a phosphorus atom, is not preferable because it inhibits the curing of the addition reaction-curable silicone rubber composition, and as described in (2) above. A condensation reaction-curable silicone rubber composition that is cured by dehydrogenation of an organopolysiloxane containing a vinyl group and an organohydrogenpolysiloxane containing a hydrogen atom bonded to a silicon atom is discharged into water containing a surfactant. When the silicone rubber composition is cured after emulsification to obtain a silicone rubber particle, the anionic emulsifier is an organohigh emulsifier. Not preferable because it impairs the stability of Roger down polysiloxane.

In the present invention, the surfactant may be used alone or in combination of two or more. The blending amount of the component (C) is in the range of 0.05 to 10 parts by weight, preferably 0.5 to 5 parts by weight, based on 100 parts by weight of the component (A). If it is less than 0.05 parts by weight, the storage stability of the aqueous dispersion of the present invention will be deteriorated and the silicone rubber particles will separate from water. If it exceeds 10 parts by weight, the amount of the surfactant will be too large. This is because it becomes impossible to impart excellent lubricity and releasability to the surface of various base materials.

The present invention can be easily obtained by uniformly mixing the components (A) to (C). Alternatively, when the component (B) is produced in water containing a surfactant as described in the above (1) or (2), for example, the water of the aqueous dispersion of the obtained silicone rubber granules itself It is obtained by adjusting the amount, the amount of silicone rubber granules, and the amount of emulsifier. That is, it can also be obtained by adding a predetermined amount of water and / or a surfactant to the aqueous dispersion of the silicone rubber particles obtained in (1) and uniformly mixing and stabilizing the mixture. Furthermore, the present invention, during the production of the above (1), the amount of the components (A) to (C) in the finally obtained aqueous dispersion by adjusting the amounts of the components (A) to (C) is different. It can also be obtained by quantitatively blending. Further, when the component (B) is produced in water containing no surfactant, that is, when it is produced in water itself, a predetermined amount of the component (C) is added to an aqueous dispersion of the obtained silicone rubber granules. It can be easily obtained by adding an emulsion and then stabilizing it by adding a predetermined amount of component (A) thereto.

The lubricating / releasing agent of the present invention has excellent storage stability, and when applied to various base materials, it imparts excellent lubricity and releasability to the surface of the base material. Therefore, it is preferably used as a lubricant / release agent for plastic, rubber, metal, wood, etc.

[Examples] Next, the present invention will be described with reference to Examples. In the examples, "parts" means "parts by weight".

Example 1 Dimethylpolysiloxane having a hydroxyl group at both ends of a molecular chain and a viscosity of 80 centipoise (hydroxyl group content: 1.5
%), And 12 parts of methylhydrogenpolysiloxane having a viscosity of 10 centipoise (both silicon atom-bonded hydrogen atom content: 1.5% by weight) in which both ends of the molecular chain are blocked with trimethylsiloxy groups, and mixed ( Mixture A).

Next, 2 parts of dibutyltin dioctoate was added to 100 parts of the same dimethylpolysiloxane as above and mixed to obtain a mixture similar to the above (mixture B). This mixture A and mixture B
Each into separate storage tanks, and add these tanks to -1
Cooled to 0 ° C. Then 100 parts of this mixture A and mixture B
100 parts of the mixture was sent to a static mixer [10 elements manufactured by Tokushu Kika Kogyo Co., Ltd.] and sent to a colloid mill while mixing uniformly, and at the same time 1000 parts of water and a surfactant (ethylene oxide of trimethylnonanol were added). 2.5 parts of Union Carbide Corporation, nonionic surfactant, Taditol TMN-6) are fed and mixed under the conditions of 1400 rpm and a gap of 0.1 mm to obtain an aqueous dispersion of silicone rubber particles. It was When the silicone rubber particles in the aqueous dispersion were taken out and the particle size was measured, the average particle size was 5 μm. The silicone rubber water dispersion was extruded to fill the electric wire bath. Next, an electric wire having a diameter of 5 mm and coated with a hard vinyl chloride resin was immersed in this bath at a wire speed of 30 m / min and allowed to pass therethrough, and then water adhering to the surface of the electric wire was removed through a drying furnace.
The surface of the obtained electric wire was non-blocking and had good slipperiness. An electron micrograph of the surface of this wire was taken and the surface condition was observed.
The μm-sized silicone rubber particles were uniformly adhered and coated. The extrusion conditions for the electric wire coated with the hard vinyl chloride resin were as follows.

Extruder Screw type die Diameter 5 mm Temperature 200 ° C. Core wire diameter 5 mm Bath temperature 25 ° C. Example 2 Dimethylpolysiloxane with a viscosity of 500 centipoise with both ends of the molecular chain blocked with dimethylvinylsiloxy groups (vinyl group content 0.5 wt. %) 6 parts of methylhydrogenpolysiloxane having a viscosity of 10 centipoise (both silicon atom-bonded hydrogen atom content: 1.5% by weight) in which both ends of the molecular chain are blocked with trimethylsiloxy groups, and mixed (mixture) A).

Next, to 100 parts of the same dimethylpolysiloxane as described above, 0.6 part of an isopropyl alcohol solution of chloroplatinic acid (platinum content: 3% by weight) was added and mixed (mixture B). The mixture A and the mixture B were mixed by a colloid mill in the same manner as in Example 1 to obtain an aqueous dispersion of the liquid silicone rubber composition. When the obtained aqueous dispersion was left as it was for 24 hours to cure the liquid silicone rubber composition, an aqueous dispersion containing silicone rubber particles having an average particle diameter of 7 μm was obtained. Then, this aqueous dispersion was filled in a bath similar to that in Example 1, and then an electric wire having a diameter of 8 mm covered with a heat-curable silicone rubber was immersed in the bath at a linear velocity of 30 m / min and passed through. When the obtained electric wire was dried and the surface condition was examined, no blocking property was observed on the surface,
Further, the adhesion of the marking ink was better than that of the surface of the electric wire to which talc had been adhered, which has been conventionally used for preventing blocking.

Example 3 Aqueous dispersion 1 of the silicone rubber granules obtained in Example 1
To 100 parts of water, 100 parts of water and the surfactant used in Example 1 of 0.
25 parts were added and mixed. After spraying the obtained mixture on both sides of the metal conveyor belt for packing and transporting, when the packing consisting of 10 kg carton case was extruded, it easily moved without stopping in the middle and the sliding effect was very good. It turned out that

Example 4 Aqueous Dispersion 1 of Silicone Rubber Granules Obtained in Example 2
100 parts of water to 100 parts of water and the surfactant used in Example 2 of 0.
25 parts were added and mixed. After spraying the mixture obtained in a groove or sill of a sliding door of a Japanese-style building with a spray, the sliding door (fusuma) was moved and the number of times until the sliding resistance value increased was examined. It was more than 200 times.

For comparison, the number of times the sliding door was moved in the same manner as above except that dimethylpolysiloxane (SH200 / 100 centistokes manufactured by Toray Dow Corning Silicone Co., Ltd.) was used instead of the aqueous dispersion of the silicone rubber particles. As a result, the sliding resistance value increased at the 105th movement of the sliding door.

Example 5 An aqueous dispersion of the silicone rubber granules obtained in Example 1 was sandwiched between two metal plates plated with chrome, and a press frame die (150 × 250 × 2 mm) was sandwiched between the two metal plates. Was spray-applied and dried at room temperature for 20 minutes. Then, a liquid silicone rubber composition [SE6706 manufactured by Toray Dow Corning Silicone Co., Ltd.] was injected into the mold, and this was heated at 150 ° C. for 5 minutes to be cured. After that, when the obtained molded product was taken out from the mold, the releasability from the mold was very good, and the surface of the molded product was glossy.

For comparison, a molded product was obtained in the same manner as above except that the aqueous dispersion of the silicone rubber granules was not used, and the molded product could not be easily released from the mold, and the surface thereof had a glossy surface. There was no

[Effects of the Invention] The lubricating / releasing agent of the present invention is an aqueous dispersion of silicone rubber particles comprising (A) a predetermined amount of water, (B) a predetermined amount of silicone rubber particles, and (C) a predetermined amount of a surfactant. Therefore, it has excellent storage stability, and when it is applied to various base materials, it has excellent lubricity and excellent releasability.

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Claims (1)

[Claims] 1. From (A) 100 parts by weight of water, (B) 1 to 35 parts by weight of a silicone rubber granule having an average particle size of 0.1 to 1000 μm, and (C) a surfactant of 0.05 to 10 parts by weight. A lubricating / releasing agent, which is an aqueous dispersion of the silicone rubber particles.