Practice Eye Piercing And Identify The Advantages And Disadvantages Of Leather Care Agents.

1, leather care agent must be grease.

Synthetic leather mesh in China: leather care agent containing grease. When rubbing with hands, it has oily feeling, but it is not greasy. When the temperature reaches 450~750 degrees, it can be ignited and burned with the help of inflammable materials. Therefore, it can be tested by combustion method, that is, spraying a small amount of nursing agent evenly on toilet paper, putting it on mosquito repellent incense rack, igniting toilet paper first and burning it to nursing agent, then the nursing agent can be ignited.

2, pH detection with pH value

If the pH value of leather care agent is greater than 7, it is alkaline. It penetrates into the skin, destroys the original oil film between the fibers inside the skin, and cleanses the skin fat, so that the fibers between the inner surface of the leather become more adhesive and frictional, and it will also rot the dermal fibers. Therefore, the leather becomes hard, brittle and even cracked. The reason why the leather is harmful to the dermis is here, that is, using alkaline cleanser to clean the dermis and penetrate into the alkaline substance inside the dermis, will destroy the internal structure of the dermis, especially the oil film on the surface of the skin, especially the oil film on the surface of the skin, so that the dermis will harden, crisp and even crack. Therefore, in addition to oily detergents, water detergent can not be used to care for dermis.

Leather care agent qualified PH value between pH =5~7.

PH pH test paper is available in general chemical teaching shops.

3, not easy to volatilize, no smell.

Strong smell shows that it contains volatile components, mostly containing solvents. If the leather is not very dry, it will dry quickly after applying the care agent on the leather surface. It also indicates that it contains volatile solvents. It will enter the body through the respiratory system during nursing. When using leather products, it will enter the human body through the pores of the human body, which is not conducive to human health. In addition, when the leather care agent containing volatile components is injected into the inner part of the dermis, the volatilization will also take away the original oil injected into the leather, making the leather stiffer and crisp.

Strong aroma is usually "golden house and charming". Most chemical products smell bad, so they need to be perfumed and covered up.

4. Suitable penetration and adhesion.

The high quality leather care agent can penetrate into all parts of the leather evenly. fibre The surface is well bound with the inner fibers, and the binding force between the wax and the inner fibers of the dermis is poor. Because of the low wax burning and easy volatilization, the wax will soon be lost in the leather. The loss of the original oil will cause the leather to become harder and crisp, and the wax will also clog the hairs. So pure wax is not suitable for nursing the dermis.

5. Water quality

Leather care agents can be combined with water to be water-based, and waterborne leather care agents are generally not toxic or toxic.

6, after the nursing of dermis, it has the following characteristics:

A, soft, after care leather, because the oil film between the surface of the skin is refurbished, the adhesion between the fibers in the skin is relieved, so that the friction force between the fibers inside the skin is approximately equal to the friction force between the oil molecules, so the leather is very soft.

B and dermis are moist.

C, plump;

After D, waterproof and leather care, the water on the surface of the inclined leather will not stay, and the water will not penetrate into the dermis easily.

E, mechanical strength such as tensile strength, tear strength, grain surface cracking strength can be greatly increased, but also can increase the elongation of dermis.

F will not seal the fur of the dermis, but has little effect on the permeability of water.

7, can be degraded, no pollution to the environment, meet the requirements of environmental protection.

The leather plus oil additive is also suitable for the above requirements.

But one-sided pursuit of the surface effect, the skin surface like a batch of walls, decorated as a mirror as bright, not care, but Decoration - this is closed pores, a bit like cocoon. Self bind It is not good for people's health.