JP2018080244A5 - - Google Patents

Description

The present invention is a protective coating agent which does not contain an organic solvent or an organic surfactant, and which imparts water repellency, heat resistance, weather resistance, abrasion resistance, stain resistance, ultraviolet ray cut, impact resistance, etc. of various substrates, cosmetics relates silicone emulsion which is suitably used as a plastic additives. In particular, it relates to an emulsion of silicone resin.

(Component (A))
The organopolysiloxane of component (A) of the present invention is an organopolysiloxane of which the average composition formula is represented by the general formula (1).
R ¹ _a SiO _{(4-a) / 2} (1)
[In Formula (1), R ¹ may be the same or different in the molecule, and is a substituted or unsubstituted saturated or unsaturated monovalent hydrocarbon group having 1 to 25 carbon atoms, a substituted or unsubstituted aromatic group having 6 to 30 carbon atoms, a hydroxyl group, an alkoxy group or a hydrogen atom of 1 to 6 carbon atoms, a is less than 0.3 and not more than 2.0. ]
R ¹ bonded to a silicon atom in component (A) is preferably a substituted or unsubstituted monovalent hydrocarbon group having 1 to 13 carbon atoms.
a is a numerical value related to the order of the siloxane bond, and when a is 2.0, component (A) represents a linear siloxane. In the present invention, since a is less than 2.0, component (A) is a resin. If a is 2.0 or more, the component (A) becomes an oil, so that the object of the present invention, ie, good coating properties and cosmetic properties can not be achieved. Further, if a is less than 0.3, although it is in a resin state, it is close to glass because of its high dimension, making emulsification difficult and not suitable.

The method for producing the emulsion composition of the present invention more preferably comprises fluidizing the entire component (A) by homogenization with an organopolysiloxane having a viscosity of 1 to 200000 mPa · s at 25 ° C., then the component (B) It is preferable to disperse the component (A) in water with silica particles that are By this, when component (A) is difficult to emulsify like a solid resin or elastomer main body, emulsification becomes possible by contacting with the above-mentioned organopolysiloxane and fluidizing the whole. Therefore, the resin which was conventionally difficult to emulsify can also be present in an emulsion state, and the problem can be solved effectively.
Furthermore, as a more preferable production method, a fluid obtained by fluidizing component (A) powder solid with polyorganosiloxane etc. is added to the aqueous dispersion of silica particles of component ( B ), and mechanical shearing is applied to this method. It is mentioned to obtain an emulsion. In this case, as long as the powder solid of component (A) dissolved by organopolysiloxane or the like can be added to the dispersion liquid of silica particles of component (B) and water of component (C), silica particles of component (B) Either of the dispersion step of water and component (C) and the fluidization step using component (A) powder solid organopolysiloxane or the like may precede.

The composition of the present invention is a polyoxyalkylene alkyl ether such as polyoxyethylene tridecyl ether, polyoxyethylene hexadecyl ether, polyoxyethylene octadecyl ether, etc., within the range not impairing the object of the present invention, a polyoxyethylene hydrogenated castor It can contain an ionic surfactant such as oil, nonionic surfactant such as polyoxyethylene sorbitan ester, and sodium lauroyl glutamate, lysine sodium dilauroyl glutamate, and the like, which can alleviate skin irritation.
The amount of surfactant is preferably 0.1 parts by mass or less, more preferably 0.06 parts by mass or less, per 100 parts by mass of the emulsion. When it is more than 1 part by mass, the environment is adversely affected and the cohesion of the silica particles is reduced to impair the storage stability of the product and the handling at the dilution.

Example 1
An oil-in-water silicone emulsion 1 was prepared as follows. As the silica particles, dry silica, which is an aggregate having a distribution of a BET surface area of 200 mm ² / g, a carbon content of 10%, and a particle diameter of about 100 to 1000 nm, was used. This is hereinafter referred to as "silica particle 1". First, the silica particles 1 4.8 parts by weight of water 50 parts were dispersed by stirring at 4000rpm using an IKA Ltd. Ultra-Turrax T50 Basic shaft generator G45M, manufactured by adjusting the silica particle aqueous dispersion did. Next, in a separate container, 22.6 parts by mass of the flake-like silicone resin is mixed with 22.6 parts by mass of dimethylpolysiloxane having a viscosity of 10 mPa · s (25 ° C.) blocked at each end with a trimethylsilyl group. Dissolving gave a mixed oil. Next, the oil-in-water silicone emulsion 1 was obtained by adding the prepared mixed oil to a water dispersion of the silica particles 1 under a stirring condition of 4000 rpm.
The storage stability evaluation of the oil-in-water silicone emulsion 1 and the contact angle measurement with water were performed to evaluate the water repellency of the coating. The formulation of the emulsion and the evaluation results are shown in Table 1.

Example 2
An oil-in-water silicone emulsion 2 was prepared as follows. An oil-in-water silicone emulsion 2 was obtained in the same manner as in Example 1 except that 45.2 parts by mass of silicone elastomer gel having a viscosity of 100,000 mPa · s (25 ° C.) was used for component (A). The prescription is shown in Table 1.
The storage stability evaluation of the oil-in-water silicone emulsion 2 and the contact angle measurement with water were performed to evaluate the water repellency of the coating . The results are shown in Table 1.

Comparative Example 2
An oil-in-water silicone emulsion 4 was prepared as follows. An oil-in-water silicone emulsion 4 was obtained in the same manner as in Comparative Example 1 except that 45.2 parts by mass of silicone elastomer gel having a viscosity of 100,000 mPa · s (25 ° C.) was used for component (A). The prescription is shown in Table 1.
The storage stability evaluation of the oil-in-water silicone emulsion 4 and the contact angle measurement with water were performed to evaluate the water repellency of the coating . The results are shown in Table 1.

Comparative Example 3
Preparation of the oil-in-water silicone emulsion 5 was attempted as follows. First, the silica particles 1 5 parts by weight of water 50 parts were dispersed by stirring at 4000rpm using an IKA Ltd. Ultra-Turrax T50 Basic shaft generator G45M, and the silica particle aqueous dispersion was made tone. Then, 45.2 parts by mass of a flake-like silicone resin was added to the aqueous dispersion of the silica particles under stirring at 4000 rpm. An emulsion was not obtained.

From the comparison of Example 1 with Comparative Example 1 and the comparison of Example 2 with Comparative Example 2 in Table 1, in the case of the silicone resin which is the component (A), in the case of the elastomer gel, either the component (B) The storage stability of the emulsion is secured by the presence of the silica particles in the above, and from the comparison of Example 1 and Comparative Example 3, the formation of an emulsion is achieved by mixing and mixing dimethylpolysiloxane of low viscosity with component (A). It turned out to be secured.