Does sunscreen really work, and how does sunscreen work?

Sunscreen is a common skin care product, it can prevent sunburn, sunburn, etc., and is a sunscreen product that is added to block and absorb ultraviolet rays. According to the principle, there are two main categories, which are physical and chemical sunscreens. Sunscreen is a product that can effectively protect against the sun, and it is necessary to choose different PA values according to different objects.

1. Sunscreen can effectively block the infringement of ultraviolet rays on the top of the sunscreen, which blocks the direct exposure to the sunscreen. Ultraviolet light comes in three different wavelengths, UVA, UVB, and UVC, with physical and chemical sunscreens being somewhat different. Physical sunscreen directly acts on ultraviolet rays and reflects ultraviolet rays, which contain a lot of opaque particles, the main components of which are titanium dioxide and zinc oxide, which can play an effective sunscreen effect and provide ultraviolet UVB level protection.

Chemical sunscreen is to reduce the energy of ultraviolet rays, so as to achieve sunscreen, physical sunscreen is significantly better than chemical sunscreen. <>

2. Sunscreen and sunscreen lotion are two products with different physical shapesSunscreen and sunscreen lotion are two different types of sunscreen products, and they both have a large market. The main difference between them is the difference in water content, sunscreen generally has a water content of more than 60%, and it is presented as a paste-like substance, which is different from sunscreen. Sunscreen should have a water content of more than 70%, which is a liquid substance with fluidity, and they all have their own characteristics.

There are many precautions when using sunscreen, and regular use can prevent sunburn and aging, and it is a product that is good for people. When using, you should pay attention to avoid causing allergies, choose a sunscreen that suits your own ** coefficient, do not mix multiple brands of sunscreen, store it properly, and do not use too much.

The principle of sunscreen is to form a protective film on the surface of the skin to isolate the direct exposure of ultraviolet rays to the skin.

The principle of sunscreen is that physical sunscreen can reflect ultraviolet rays, and chemical sunscreen is based on the principle of absorbing ultraviolet rays and converting them into harmless energy.

Sunscreen definitely has some effect, applying sunscreen to the face to form a film that reduces UV exposure.

Useful. The principle is to use a sunscreen to isolate ** from ultraviolet rays, but it must be applied half an hour in advance to have an effect.

It is useful, mainly to form a protective film on the surface of ** to isolate ultraviolet rays and achieve the effect of sun protection, but it will be invalid after a certain period of time and needs to be reapplied.

Sunscreen works by isolating ** from ultraviolet rays. There are two types of sunscreen:

The first is physical sunscreen, which is to use the principles of physics and rely on the reflection of physical sunscreens (common ones such as titanium dioxide and zinc oxide) to shield off ultraviolet rays and achieve the purpose of sun protection. To put it simply, it is to use reflective particles to form a protective wall on the surface, which does not need to absorb ultraviolet rays, and the burden will be smaller, and the disadvantage is that the particles are relatively large, appear white and greasy, and makeup removers must be used to help remove them, and so on.

The second is chemical sunscreen, which is to use chemical ingredients to protect from the sun, this sunscreen is to use the principle of absorption to protect from the sun, which is a light-transmitting substance, which can absorb ultraviolet rays, convert them into heat and then release them, in order to achieve the effect of sunscreen, such as para-aminobenzoic acid and its derivatives, cinnamic acid, etc. Yashu Time and Space Stripe Cooling Sunscreen is a chemical sunscreen, because it needs to be absorbed, so it can only play a role after 20 minutes of application, the advantage is that it is transparent and refreshing, but people with sensitive skin may be allergic (the way to prevent it is to try it on the inside of your wrist before buying, if it is not red, not swollen, not painful, and not itchy within 10 minutes, then it will be fine).

Since both physical and chemical sunscreens have their own advantages and disadvantages, some protective products try to mix and match the two ingredients to bring out all the benefits and minimize the disadvantages, such as Arvie's Flawless BB Cream and Brightening Cream.

The principle is to form a protective film on the surface of the skin to block direct exposure to ultraviolet rays. People who use sunscreen regularly will be healthier than those who don't, because sunscreen effectively blocks UV rays.

Sunscreens are divided into physical sunscreens and chemical sunscreens, and the principles of these two sunscreens are slightly different. Physical sunscreens are designed to reflect ultraviolet rays, which contain tiny, opaque particles that prevent UV rays from entering our skin. The principle of sun protection in chemical sunscreens is to absorb ultraviolet rays, so that the energy of ultraviolet rays is weakened, so that they cannot reach the skin.

However, whether it is physical sunscreen or chemical sunscreen, they are to isolate ultraviolet rays from the skin, prevent our skin from sunburn and tan, and effectively prevent photoaging, so that the skin is in a more youthful state.

Know the principle of sunscreen protection, and know how to use it.

i: Use after basic skincare and before makeup.

ii: After using sunscreen, you need to wait for about half an hour before going out, otherwise you will not have a good sunscreen effect, but will be sunburned and tanned.

iii: Use sunscreen in small amounts the size of a dollar and a small amount on your face multiple times. The more sunscreen you apply is not the better, otherwise it will cause a lot of burden on the skin and skin problems will follow, and the amount of a coin will ensure the effect of sun protection while also making the skin feel lighter.

iv: Sunscreen must not be stored in a place exposed to high temperatures, as this will cause its ingredients to deteriorate, breed bacteria, and cause facial infections leading to acne or allergies.

V: Makeup removal is also required when using sunscreen.

vi: Different brands of sunscreen cannot be mixed. Even if the principle of sunscreen is the same, different brands use different ingredients, and mixing them can cause allergies.

On the other hand, it works through two mechanisms: reflection and absorption of light. Generally, inorganic matter is reflective, and organic matter is absorption.

Physical sun protection. Physical sunscreen products mainly add reflective particles (such as titanium dioxide and zinc oxide) to the product, so that the ultraviolet rays that reach the product are reflected out, forming a protective wall on the product. The disadvantage of physical sunscreen is that the reflective particles are usually larger, making them whitish and feeling very heavy and greasy.

Chemical sunscreen. The principle of chemical sunscreen is to absorb ultraviolet rays through chemical components, convert ultraviolet rays into heat and release them to achieve sunscreen effect. The advantage of chemical sunscreen is that it is more refreshing and does not add too much burden to **.

However, the downside is that these added chemicals are highly irritated, so it is recommended that people with sensitive skin try them on the inside of their wrists before buying. Told by 360 Cosmetics.

Sunscreens are divided into physical sunscreens and chemical sunscreens according to their different principles of action.

Physical sunscreen principle: opaque, very fine particles reflect or scatter ultraviolet rays, so that ultraviolet rays cannot enter**.

The principle of chemical sunscreen: chemically synthesized lipids absorb ultraviolet rays, so that the ultraviolet energy is attenuated and cannot reach**.

Sunscreen acts as a sunscreen through inorganic and organic active ingredients, mainly to prevent sunburn, prevent photoaging, and prevent tanning.

Ultraviolet rays are referred to as UV, and the ingredients that will cause damage to human skin mainly include UVA and sunburn the skin, and UVA will tan the skin and "tan the age"; The intensity of UVB varies with the seasons and climate, with the weaker in winter and the strongest in summer, and the intensity of UVA is more stable and generally does not change with the season and weather.

There are two types of sunscreens: physical sunscreen and chemical sunscreen, which are explained separately below:

1. Physical sunscreen: Using the principle of physics, the atomic particles of this sunscreen are flaked, and reflective particles, such as titanium dioxide and zinc oxide, are used to reflect and scatter light, so that the amount of ultraviolet rays that reach the highest level can be reduced to achieve the purpose of sunscreen.

2. Chemical sunscreen: Sunscreen is achieved by absorbing harmful ultraviolet rays, because chemical sunscreen molecules will be absorbed, so the process of absorbing ultraviolet rays occurs inside and is metabolized by the human body and removed.

The basic principle of sunscreen is to isolate ** from ultraviolet rays, and sunscreen is mainly divided into two types: physical sunscreen and chemical sunscreen

Physical sunscreen: Rely on the reflection effect of physical sunscreen to block ultraviolet rays and achieve the purpose of sun protection.

Chemical sunscreen: refers to the chemical composition of a light-transmitting substance contained in sunscreen, which is converted into heat and then released after absorbing ultraviolet rays, so as to achieve the effect of sunscreen. It is to use the principles of physics, relying on the reflection of physical sunscreens or (common titanium dioxide and zinc oxide) to block out ultraviolet rays and achieve the purpose of sun protection.

To put it simply, it is to use reflective particles to form a protective wall on the surface, which does not need to absorb ultraviolet rays, and the burden will be relatively small, and the disadvantage is that the particles are relatively large, and the top appears white and greasy, and makeup removers must be used to help remove them and so on.

Physical sunscreen uses the principles of physics, relying on the reflection of physical sunscreens (commonly titanium dioxide and zinc oxide) to block out ultraviolet rays and achieve the purpose of sun protection. To put it simply, it is to use reflective particles to form a protective wall on the surface, which does not need to absorb ultraviolet rays, and the burden will be relatively small, and the disadvantage is that the particles are relatively large, and the top appears white and greasy, and makeup removers must be used to help remove them and so on. Chemical sunscreen is to use chemical ingredients to protect from the sun, this sunscreen is the use of the principle of absorption to protect from the sun, the sunscreen contains a chemical composition of a light-transmitting substance, after absorbing ultraviolet rays, it will be converted into heat and then released, in order to achieve the effect of sunscreen, such as para-aminobenzoic acid and its derivatives, cinnamic acid, etc.

Sunscreens that usually have a chemical sunscreen effect need to absorb the agitated aging time, so they can only work after 20 minutes of application, and the advantage of chemical sunscreens is that they are transparent and refreshing, but people with sensitive skin may be allergic.