サンプルを無料で提供できます

あなたのニーズを送ってください: market@bearingsupplier.cn

The Basic Functions of Lubricating Grease
The Basic Functions of Lubricating Grease
2022年3月25日
Class 5 Surface Hardening Technology of Imported Bearing Materials
Class 5 Surface Hardening Technology of Imported Bearing Materials
2022年3月25日

Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease

  • Lubricating grease is a plastic lubricant composed of one (or more) thickener and one (or more) lubricating liquid ベアリング.

Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease

  • Physical properties of grease
  • Including appearance, dropping point, penetration, colloidal stability, moisture, mechanical impurities and evaporation
  • Appearance: including color, brightness, transparency, fiber number, uniformity, odor, emulsification, smoothness, softness and hardness. Meaning of appearance in use:
  • The quality of grease can be generally inferred from the appearance. Such as uniformity, softness and hardness, presence or absence of soap block, presence or absence of mechanical impurities, etc.Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease
  • Preliminarily identify the variety of lubricating grease. 例えば, calcium base grease and lithium base grease are fine fiber paste, and sodium base grease is long fiber structure.Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease
  • You can understand the adhesion and protection of grease. Such as Vaseline and hydrocarbon grease, with strong viscosity, wiredrawing and adhesion.Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease
  • You can also know the mechanical stability of grease, あれは, whether it is easy to become thinner by twisting and pressing with your fingers.Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease
  • .Drip point: also known as drip point. When heated under the specified conditions, the lubricating grease softens with the increase of temperature. The temperature of the drop from the grease cup is called the drop point. Significance of dropping point in use:
  • The drip point can determine the allowable high temperature of the grease when it is used. 一般的に言えば, the grease should work at a temperature 20-30 ℃ below the dropping point.Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease
  • The type of grease can be roughly judged according to the measured dropping point and appearance index identification. 例えば, the dropping point of calcium base grease is about 70-100 ℃; The dropping point of calcium sodium base grease is about 120-150 ℃;
  • The dropping point of sodium base grease is about 130-160 ℃; When the dropping point is higher than 200 ℃, it is mostly synthetic grease.Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease
  • Cone penetration: cone penetration is an index to measure the consistency (i.e. hardness) of lubricating grease. The measurement method is to keep the grease at a certain temperature, expressed by the depth of the standard cone with the specified weight sinking into the grease within 5S. The unit is 1 / 10んん. Significance of cone penetration in use:Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease
  • Indicates the consistency of the grease. If the cone penetration is large, the consistency is small. If the cone penetration is small, the consistency is large. To a certain extent, it indicates the load borne by the grease when it is used. The grease with small cone penetration bears a larger load.Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease
  • Indicates flow performance. The grease with large cone penetration is soft, otherwise it is hard. If the cone penetration is too large, it is easy to lose, and if it is too small, the fluidity is poor. Lubricating grease with too small cone penetration is not suitable for high-speed motion pairs, nor for pipeline pressure grease feeding lubrication devices.
  • Cone penetration can represent the plastic strength of grease, so as to preliminarily understand its ability to resist extrusion and shear, which is convenient for rational use.Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease
  • The brand of lubricating grease is divided according to the cone penetration. したがって, if you know its brand, you can know the range of cone penetration, and if you know its cone penetration, you can know its brand.
  • Oil separation: lubricating grease tends to separate oil during storage and use, and lubricating grease with good quality has less oil separation. The oil separation tendency of lubricating oil (also known as colloidal stability) has a great influence on its use.Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease
  • Moisture: moisture refers to the mass fraction of water in lubricating grease. It is used to control the percentage of moisture in the product specification. Significance of water in use:Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease
  • There are two forms of moisture in grease. One is structural water, which forms hydrate crystals. This water is the stabilizer of grease, an indispensable component and is allowed to exist in grease. The other is free water, which is adsorbed or mixed in the grease, which is harmful to the grease and will reduce the lubricity, mechanical stability and chemical stability of the grease. If there is too much free water, it will corrode the parts.

Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease

Composition of grease

  • The main components of lubricating grease are base oil, thickener and additives (additives and fillers).
  • Mineral oil is generally selected as the base oil, and synthetic oil can also be selected as the base oil under the condition of special requirements.
  • Thickener is an important characteristic component of lubricating grease. It is a solid particle that is relatively evenly dispersed in the base oil to form a grease structure. Its main function is to thicken the flowing liquid lubricating oil into a non flowing semi-solid state. Different kinds of thickeners will have an important effect on the performance of a series of greases.
  • Thickeners can be divided into two categories: soap based and non soap based (hydrocarbon based, organic and inorganic).
  • Soap base: ① single metal soap (calcium base, sodium base, lithium base, aluminum base, barium base, 等); ② Composite soap (composite calcium soap, composite lithium soap, composite aluminum soap, 等) ③ mixed metal soap (calcium sodium base, lithium calcium base).
  • The hydrocarbon groups of non soap based thickeners are mainly wax, paraffin and stone oil; Organic thickeners include amide, urea group, fluorocarbon, 等; Inorganic thickeners include bentonite, silica gel and boron nitride.
  • According to the performance requirements, additives such as glue solvent, antioxidant, extreme pressure anti-wear agent, antirust agent, waterproof agent and silk reinforcing agent can also be added.
Physical and Chemical Indexes and Composition of Commonly Used lubricating Grease
私たちとしゃべる
私たちとしゃべる
質問, 疑問, 問題? 私たちはあなたを助けるためにここにいます!
接続中...
現在、当社のオペレーターは誰も利用できません. お願いします, あとでもう一度試してみてください.
オペレーターは忙しい. 後でもう一度やり直してください
:
:
:
質問はありますか? 私たちに書いてください!
:
:
このチャット セッションは終了しました
この会話は役に立ちましたか? このチャット セッションに投票する.
良い 悪い