Yang Fei is not a star, even if he is a star, there are people who don't know him! Ang Lee is so famous, isn't there anyone who doesn't recognize him?

The boy said, "I don't recommend using a high-foaming formula, I'll talk to the tutor!"

Zhu Lin said: "With Yang Fei here, it's useless for you to find anyone, even if the mentor comes, you have to listen to Yang Fei!"

The boy really didn't know Yang Fei, after all, the school was so big, there were so many students, and Yang Fei had few opportunities to show his face, he looked at Yang Fei again, smiled, and said: "How can he have the final say? In this matter, I will stick to the end! This is the direction of the development of science and technology, and it is also the truth that I believe!"

Yang Fei said: "I just said, no one is right or wrong in this matter. Shampoos, shower gels, and hand sanitizers will all have surfactants, such as sodium lauryl sulfate, etc., which can play a cleansing role. ”

Next, he briefly talked about the principle of shampoo decontamination.

The surfactant has two ends, hydrophilic and lipophilic, among which the lipophilic part is generally a non-polar group such as a long-chain alkyl group, which has a large force with organic matter and a small force with water, and the hydrophilic part is generally a polar group such as sulfonic acid group, which has a large force with water and a small force with organic matter. When interacting with the oil, the lipophilic group is inserted inwards into the oil, while the hydrophilic group is outward, so the surfactant encapsulates the oil.

The structure of the lipophilic group formed by the surfactant is inward and the hydrophilic group is outward, and the process of the surfactant interacting with the water-insoluble oil to increase the solubility of the insoluble substance is called micelle solubilization. Washing away the oil from the hair is a surfactant for solubilization.

Another major function of surfactant is to reduce the surface tension of water, so that the surface tension that needs to be overcome when the oil is dispersed into oil droplets is reduced, and the interfacial energy of small oil droplets at the oil-water interface is lower, so that the emulsion is stabilized, and the oil stain can be easily washed away with water after forming a relatively stable emulsion in the water.

Before we wash our hair, we will first mix the shampoo in the palm of our hands, which is actually a stirring process in which the surfactant-dissolved solution is in full contact with the air.

If the hair does not have any oil stains for the lipophilic groups to act, then the lipophilic groups will stay away from the water and form bubbles, which is why the foam is abundant.

The less oil contamination, the more surfactant involved in the formation of bubbles, the more foam formed, and the more oil pollution, the less amount of surfactant involved in the formation of bubbles, and the less foam formed. This explains why we all feel that when our hair is clean, we lather more when we wash our hair and less when we are dirty.

It can be seen that foaming is actually just a by-product of the washing process, and it is not an indicator of whether the shampoo is good or not.

When the boy saw Yang Fei talking eloquently and speaking in an orderly manner, he couldn't help but be impressed, and asked, "Classmate, how old are you in college? ”

Zhu Lin laughed and said, "You may not believe it, Yang Fei has just been a freshman and is our junior." And he often takes leave and skips school, and the most hateful thing is that he has not fallen behind in his homework, and his grades are still so good. ”

Yang Fei smiled indifferently: "Everything in the world is full of knowledge, and society is full of schools." ”

The boy suddenly said, "I remember, you are the president of the school's entrepreneurship club, right?"

Yang Fei said: "Yes. ”

The boy said: "I often mention President Yang, but I haven't seen you, and the project we are studying now is the product of your white company!"

Yang Fei said: "The efficacy of shampoo is diverse, and the nature of each person's hair is different, and there are great differences in regions and individuals. Therefore, we should develop several different types of shampoos to meet the needs of different groups of people. ”

Zhu Lin said: "President Yang, we girls usually buy shampoo, but we only buy shampoo with rich foam, and we always feel that shampoo is better if there is more foam." Even if this is not a hard indicator, it is also a psychological suggestion that will affect the choice of consumers. ”

The boy said: "You girls are hypocritical! Knowing that this is a psychological suggestion, you will be fooled!"

Yang Fei said with a smile: "The shampoo with rich foam, the formula table, contains sodium laureth-3 acetate, dichlorobenzene biguanide acetate and other ingredients, but the decontamination and washing power are slightly poor, because it is weakly acidic, it has less stimulation to the scalp, and can interact with the electric charge on the hair to keep the hair smooth and flat without frizz, so it is suitable for frizzy hair." We call this acetic acid. Therefore, this shampoo must have more foam. But the rest of the foam is quite small. ”

The boy was stunned for a moment and asked, "President Yang knows this business very well?"

Yang Fei said with a smile: "If you want to rely on this line of food, how can you do it if you don't know how to do it?"

In addition to acetic acid, Jiebai has also developed an amino acid system, which is suitable for dry hair, and the most important ingredients in the formula are sodium lauroyl glutamate, sodium lauroyl ether sulfate, etc.

There is also a betaine system suitable for sensitive skin, which uses ingredients such as sodium cocoyl glutamate and cocamidopropyl betaine to achieve a better moisturizing effect, which is suitable for people with sensitive skin.

There is also a type of human hair that has been damaged, so it is necessary to use a protein series, and the formula contains hydrolyzed collagen, milk and other substances, which is suitable for the repair of damaged hair.

As for the daily washing and care of ordinary people, most of them choose glucoside.

There are often words glucoside in the formula table, such as dodecyl glucoside.

The main ingredient of this shampoo is derived from glucose, which has a slightly weaker detergency but is less irritating, safer, and rich in foaming, and is often mixed with amino acids to enhance the decontamination effect without compromising safety.

In addition to these five systems, there are two series of common shampoos on the market, sulfuric acid and stone alkali.

These two series of shampoos are generally relatively inexpensive.

The former uses sodium lauryl ether sulfate and sodium lauryl sulfate, and the latter uses sodium salt of fatty acids and sodium hydroxide, although the detergency is very strong, it will destroy the beneficial oil of the human body, and make people's hair, the more you wash, the drier it is.

All in all, whether the foam is abundant or not, whether it is much or not, depends on what type of shampoo, and cannot be generalized.

When Zhu Lin and the boy heard this, they all nodded yes, and admired Yang Fei so much.

Yang Fei and the students in the research group talked for more than an hour, and his profound knowledge, as well as his grasp of society, the market, and the hearts of the people, quickly conquered the hearts of this group of scholars.

"What we're going to develop is the five series of products mentioned earlier, which can basically cover most people's hair types. Yang Fei said, "Shampoo is different from laundry detergent, it is directly acting on the skin of the human body, and it is the most important part of the head, and it is related to the image problem that everyone cares about the most.

At this time, Luo Hongcai suddenly walked in and said with a smile: "Hello everyone, I'm back!"

As soon as he saw Yang Fei present, the smile on his face froze.

Yang Fei said unceremoniously: "Senior Brother Luo, this is the research group of clean white products, and you are the R&D assistant of Procter & Gamble, it is not appropriate for you to come here!"

Luo Hongcai was very thick-skinned, smiled, and walked in without mind.

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