1. Microcapsule technology overview and microcapsule preparation

Microencapsulation technology is a new technology that coats gas, liquid and solid particles from tens of nanometers to hundreds of microns with thin layers of various natural or synthetic materials. [1] Generally, the microcapsule particle size is in the micrometer range, and the substance enclosed inside the microcapsule is called a capsule core, and the capsule core may be a solid or a liquid or a gas. The coating film formed by the film forming material on the outside of the microcapsule is referred to as a wall material. The wall material is usually formed of a natural or synthetic polymer material, and may also be an inorganic compound. The advantage of the microcapsule technology is that when the microcapsules are formed, the core material is coated and isolated from the external environment, and the properties of the core material are preserved without any influence, and at the appropriate time, the core material is broken when the wall material is broken. The substance is released, which brings a lot of convenience to the use.

Vitamin skin care microcapsules are generally divided into two types: the first type is open-cell type microcapsules. The ideal microcapsules have a number of tiny pores in the wall shell. When the temperature rises or the body temperature acts, the micropores are enlarged, and the vitamin component is accelerated by heat. Conversely, when people do not wear this skin care finishing garment, such as during storage, the micropores shrink or close due to the lower temperature, and the fragrance release rate becomes slower. The second category is closed microcapsules. The wall shell does not contain micropores, and only when the person wears it to rub against the outside, the wall of the capsule is broken to release the fragrance. The closed skin care microcapsule is usually prepared by a complex coacervation method of gelatin-arabin gum system. [2] The microcapsules obtained are cured to obtain a closed-walled skin-care microcapsule which is hardened by a wall film. If it is directly dried without curing, the obtained skin-care microcapsules are not only open-cell type but also soluble. Warm water, gelatin wall membrane dissolves and releases vitamins. The closed skin care microcapsules can also be prepared by in-situ polymerization, and a urea-formaldehyde or melamine-formaldehyde pre-shrinkage is used to form a well-sealed urea-formaldehyde resin or melamine resin wall film around the vitamin droplets. This vitamin skin care finishing agent is the main product currently on the market, and it has the advantage of long-term skin care finishing period.

2. Selection of vitamins

According to the composition of cosmetics, vitamin C and vitamin E have good antioxidant and metabolic effects on the skin, so vitamin C and vitamin E are the first choice for our skin care finishing. [3]

After a lot of tests and tests, we found that after the vitamin C was put on the fabric, there was a fatal weakness that was its oxidative property, which caused the vitamin C component to oxidize and lose its activity after a certain period of time. Less than the potency of vitamin C. In addition, in the finishing process, the addition of other additives, drying and setting temperature will cause the accelerated oxidation process of vitamin C.

How to maintain the activity of vitamin C, and it is not easy to be oxidized. After a large number of screening tests, we finally selected vitamin C palmitate (alias L-ascorbyl palmitate) as the core material of microcapsules, and achieved ideal Effect.

[China Antibacterial Fabric Network ]