Personal care products are daily consumer products for residents in the mass market. With the improvement of consumers' hygiene habits and the popularization of mass daily products, personal care products have outstanding advantages in terms of market cultivation, audience, frequency of use, and use scenarios, which also puts forward a wider range of requirements for personal care products.
Human skin is exposed to more and more chemical substances. Therefore, personal care products are required not only for skin care, hair, and hands but also to protect sensitive skin and acne-prone skin, and for scar reduction.
In addition to the use of silicone adhesives, silicone-based (especially silicone oil) with excellent overall performance and physiological sui, for more than a decade, has entered the sales of large product upgrades fast personal care products industry. It has skin compatibility and coordination with the substrate, hydrophobic permeability, good resistance to chemical media erosion, moist and not greasy, and other unique properties, also can used for wound healing, and as a component of personal care products, silicone in personal care products in the improvement of the use of performance and development of new varieties will play a pivotal role.
Here’s some information about it:
- What are the structural features of silicone?
- What are the properties of silicone?
- How to classify silicone in cosmetics and personal care products?
- How to apply silicone in cosmetics and personal care?
- How to make personal care silicone products?
1. What are the structural features of silicone?
Silicone has the following structural features.
(1) Si-O-Si main chain with high binding energy (Si-O, 106Kcal/mol);.
(2) Relatively weak intermolecular affinity (silicone oil 20~25 dynes/cm); and
2. What are the properties of silicone?
2.1 Film-forming, lubrication and hydrophobicity
Silicone oil of the whole molecule is a spiral molecule, the polarity of the silicone-oxygen bond offset each other, and the intermolecular force appears to be very small, so present a low surface tension, in the skin can be quickly spread, the formation of a uniform film, that is, the use of a small amount of water, but also so that the skin has a high degree of water repellency, without affecting the normal perspiration and causing breathable barrier.
Silicone oil can give the skin stratum corneum appropriate water, the skin is a good lubricant, but there is no greasy and sticky feeling, produces a non-adhesive and comfortable feeling, the amount of use is very small, but also makes the skin a high degree of water repellency, so as to achieve the purpose of lubrication and water repellent. Therefore, cosmetics products with silicone oil as an additive have the characteristics of spreading hydrophobic, breathable, moist but not greasy comfort and coolness on the skin surface, preventing skin roughness, and can be used as a skin protection agent to prevent industrial dermatitis, baby diaper rash, etc. It is a kind of lubrication and skin care cosmetics products, so it is formulated into various skin care creams, cold creams, and cosmetic creams.
This cosmetic-grade silicone oil has a remarkably high refractive index and can be used in the personal care industry such as hair care and color cosmetics. It has properties such as soft lubrication, anti-oxidation, and good compatibility with cosmetic ingredients. Main Functions: Shine and anti-frizz; non-sticky; soft and silky; ductility and compatibility. It can be used in hair care: shampoo, conditioner, styling products; deodorant, and antiperspirant color cosmetics (brightening eye makeup, BB, translucent lip gloss).
Low-viscosity silicone oil and low molecular cyclic silicone compounds containing phenyl in the molecule have the effect of de-sticking and have good compatibility and compatibility with general cosmetic raw materials such as beeswax, paraffin, petroleum jelly, wool wax, mineral oil, ethanol, and so on.
Silicone oil is transparent in the full wavelength of visible light, containing phenyl silicone oil in the ultraviolet region shows unique strong absorption, in 0.23 microns, and the transmittance rate does not exceed 20%. Therefore, it can be used as an additive for sunscreen cosmetics.
2.4 Volatility and low heat of vaporization
Low molecular weight cyclic silicone compounds have the characteristics of volatility and low heat of vaporization, so they are particularly important in all cosmetic additives. For example, it can be used as a deodorant, eau de toilette, hair spray, shaving lotion, nail polish, eyelash oil, and other cosmetic additives to improve the oily and wet feeling of traditional formulated products.
Because of its non-polar, silicone oil generally is dissolved in non-polar solvents and is difficult to dissolve in polar solvents, according to the size of the viscosity and the different viscosity of the lower the easier to dissolve. Phenylmethyl silicone oil is more soluble than methyl silicone oil, silicone oil on a variety of vitamins, antiseptics, anti-inflammatory agents, etc. has the ability to dissolve, so all kinds of nutritional creams, medication skin care creams, and wound healing creams with silicone oil, as a result of the formation of a layer of water-repellent film on the surface of the skin, which improves the durability of the drug effect.
Many people believe that natural-origin cosmetics are safer and that silicone-based cosmetics can be harmful. It is worth mentioning that silicone has been proven to be harmless after many tests, does silicone clog pores, suffocate skin's surface, and cause acne? Clogging pores are not and other problems will not happen.
3. How to classify silicone in cosmetics and personal care products?
So far, silicone used in personal care products have been successfully developed: Dimethyl Polysiloxane, Methyl Phenyl Polysiloxane, Hydrogen-containing silicone oils, Cyclic Polysiloxanes, Methyl Polysiloxane emulsions, Polyether-modified silicone oils, Alkyl-modified silicone oils, Amino-modified silicone oils, silicone waxes, silicone resins, silicone-treated powders, silicone gels and other series.
According to role and use in personal care products silicone can be divided into the following six categories.
3.1 Silicone oil
In personal care products, the addition of linear polydimethylsiloxane (like Dimethicone) is designed to maximize the inhibition of the greasy feeling of the oil, with a sense of smoothness and comfort, and to help the diffusion of other ingredients in the hair and skin.
Phenylmethicone is a low-viscosity, slightly volatile liquid with a high refractive index, and is very easy to compound with alcohols and organic ingredients, but other properties are similar to those of PDMS. At room temperature, it is infinitely soluble in 95% ethanol. It is miscible with aromatic solvents and many commonly used personal care ingredients such as beeswax, lanolin, mineral oil, paraffin, petroleum, and isopropyl cinnamate. Because of its convenient formulation method, Polymethylphenylsiloxane is an additive in creams, lotions, and sunscreen products.
The amount of polymerization-modified silicone oil of 0.1% to 1.0% can provide lubricity and wetness to the skin care lotion. After washing with a shampoo containing 0.1%~0.5% water-soluble polyether-modified silicone oil, the combability of dry and wet hair can be significantly improved.
In addition, when formulating personal care products, the compatibility and compatibility of silicone and personal care product accessories appear to be very important. Good compatibility, compatibility, so that the formulation of personal care products have a greater choice, to facilitate the development of different types of advanced personal care products.
3.2 Film-forming agent
The use of resin-like and rubber-like silicones has the inherent characteristics of silicones, one of durability. These compounds are easily soluble in cyclic silicone or hydrocarbon compounds volatile solvents, the solution is easy to spread on the substrate after drying, the formation of a thin film, and produces a non-tacky feeling, even if the contact also the formation of the non-transferable film, the film is hydrophobic and durability.
The resin-like silicone representation is Trimethylsiloxysilicate.
It is a solid silicone resin powder that has good film-forming properties. The soft-touch it creates provides excellent water resistance and can be used in a variety of skin care formulations. It has long-lasting, UV protection, color migration resistance, ductility, and compatibility and can be used in color cosmetics (lipstick, lip gloss, eyeliner, BB); deodorants and antiperspirants; sun care and skin care 9 facial care lotions, body creams); concealer sticks, styling products, and hair conditioners.
Different solution-type film-forming agents can be obtained by dissolving Trimethylsiloxysilicate in different solutions.
It has good film-forming properties. The soft-touch it forms provides excellent water resistance and can be used in a variety of skin care formulations.
3.3 As surfactants
Typical silicone compounds of this type are Polyether-modified silicone oils consisting of Polydimethylsiloxane as the hydrophobic group and Polyether of Polyethylene Oxide and Polyoxypropylene as the hydrophilic group.
Its most important characteristic is that it has excellent surface activity effect both in organic systems and in water.
Silicone surfactant has high physiological inertia, as personal care products, and detergents with a high degree of safety, in natural conditions can be degraded, in the clay influence, nitric acid to be ions, ultraviolet irradiation, the function of accelerated chemical degradation does not pollute the environment.
Long-chain Alkyl-modified Polysiloxane, Polysiloxane Sulfonate, Polysiloxane Sulfur Sulfate, and amine silicone, etc. are also used in personal care products, polysiloxane surfactants in personal care products are becoming more and more prominent role, become a fast-developing, worthy of attention to a class of products.
3.4 Reducing irritation
Polyether-modified silicone oil is a surfactant with extremely low irritation to the skin's surface and eyes, and when mixed with other cosmetic components, it can reduce the skin and eye irritation of the component, so it can be safely used in basic cosmetics, cosmetic cosmetics, hair cosmetics, and detergents.
3.5 Powder treatment agents
In order to further improve the properties of the powder, the current use of high molecular weight PDMS treatment of the powder surface, the powder has excellent hydrophobicity and high persistence, good make-up surface, a good sense of denseness to the skin, there is a moderate sense of stickiness, good usability.
A New powder treatment method has been developed successfully in recent years, the new method is the cyclic methyl hydrogenated polysilane and powder at atmospheric pressure below 100 ℃ for phase contact. Due to the catalytic activity characteristics of the powder surface, can produce a polymerization reaction, the formation of reticulated polymers, the result is the formation of a layer of ultra-thin film on the surface of the powder, this film using the addition reaction can be introduced into the functional groups. If the introduced functional group is alkyl, hydrophobic powder is generated, such as hydroxyl and polyoxyethylene to generate hydrophilic powder.
3.6 Detergent function
Recently, cosmetics are being developed for the purpose of improving the feel, and from the point of view of skin defense， and in the future, it has become necessary to use silicones with film-forming ability, for which the development of a new type of cleansing agent is necessary.
It is a kind of solid powder with a true spherical shape and narrow particle size distribution, and its chemical structure is a curing resin with dense cross-linking of trifunctional group components that are insoluble and non-melting. It has a variety of particle size series of 2-10um Polymethylsilsesquioxane type. It has excellent touch, spreadability and smoothness, high oil absorption, etc. It is widely used in skin care products and cosmetic formulations for powders ( for covering fine lines and wrinkles, other skin issues); sunscreen (sun protection, after-sun repair); skin care (facial skin surface care, facial cleansing, body care, baby lotion), and so on.
4. How to apply silicones in cosmetics and personal care?
After more than 50 years of effort, the use of silicone in personal care products has been almost universal and gained a wide range of products and markets.
(1) Silicone in skincare products: creams, lotions, sunscreen products, facial cleansers, hand and body washes, sore remedies, and moisturizers.
(2) Silicone in Bath & Body Works: Soaps, various types of shower gels, and others.
(3) Silicone in hair care products: Shampoos, conditioners, hair liners, shampoos, hair fixers/hair conditioners, etc.
(4) Silicone in cosmetic products: lipstick, eyelash dye/eye oil, nail polish, deodorant, deodorant, shaving products, talcum powder, floral water, etc.
5. How to make personal care silicone products?
In addition to maintaining their original excellent properties, silicone care products also have additional properties, such as film formation, conditioning, moisturizing effect, ultraviolet absorption capacity, and other new functions. Silicones are used in skincare, cosmetics, sunscreens, shampoos, body washes, and hair products. How can you make your products more competitive?
XJY Silicones is one of the leading silicone MQ resin and VMQ silicone manufacturers in China, with more than 30 years of R&D and manufacturing experience in the silicone industry and more than 15 related patents and technical support. Our silicone raw material products can meet the needs of silicone personal care products and support the provision of diversified customized solutions.