久久综合中文字幕_肉丝袜脚交视频一区二区_91成人免费网站_性做久久久久久久免费看_一区二区三区在线视频观看_欧美精品自拍偷拍_极品美女销魂一区二区三区_亚洲欧美国产高清_欧美日韩高清一区二区_成人av一区二区三区_久久久亚洲欧洲日产国码αv_麻豆成人免费电影_欧美精品乱人伦久久久久久_国产精品网曝门_中文字幕在线播放不卡一区_国产精品久久99

What is silicone?

Silica gel alias: silicone gel, is a kind of highly active adsorption material, is an amorphous substance. Chemical formula xSiO2·yH2O. Clear or milky granular solid. With open porous structure, strong adsorption, can absorb a variety of substances. Adding dilute sulfuric acid (or hydrochloric acid) into water solution of water glass and standing, it becomes water-silicate gel and solid. The electrolyte Na+ and SO4 2-(Cl-) ions dissolved in it are removed by washing, and silica gel can be obtained after drying. Such as absorbing water, some silicone moisture absorption of about 40%, even 300%. Used for gas drying, gas absorption, liquid dehydration, chromatographic analysis, etc., also used as a catalyst. If cobalt chloride is added, it will be blue when drying and red after absorbing water. Renewable and repeated use.

Classification of silica gel products

1. Molded silicone products

Molded silicone products are usually through high temperature mold in the addition of vulcanizing agent of solid silicone raw materials through the vulcanization machine pressure, high temperature sulfur into solid molding, molded silicone hardness is usually in 30°C-70°C. Raw materials and color paste according to the Pantone color card number to adjust the color, mold shape determines the shape of molded silicone products, molded silicone products are the most widely used in the silicone industry.

2. Extrude silicone products

Extrusion silicone products are usually extrusion silicone molding by extrusion machine, generally extrusion silicone shape is long, tube shape can be cut at will, but extrusion silicone shape has limitations, widely used in medical instruments, food machinery.

3. Liquid silicone products

Liquid silicone products are made by silicone injection molding and injection molding. The products are soft and the hardness can reach 10°C-40°C. Because of its soft properties, it is widely used in the simulation of human organs and medical silicone chest pads.

4. Special silicone products

Special silicone products are based on the chemical characteristics of silicone or the addition of some auxiliary raw materials, special silicone products can also have high temperature resistance, food grade, medical grade, flame retardant grade, by adding auxiliary raw materials can also have, luminous, negative ions, discoloration, and other characteristics.

Advantages of silicone products

1, high temperature resistance, can be used for oven and microwave oven. Applicable temperature range is -40 ~ 300℃. Silicone products are easy to clean and can be recovered after rinsing with clean water.

2, chemical performance is very stable, longer service life.

3, with flexibility, not easy to deform, soft touch, is a soft strong product.

4, will not produce any toxic and harmful substances, can reach food grade products, are widely used in the medical and maternal, as well as children's toys industry.

5, high resistivity, good electrical insulation performance, resistance in a wide range of temperature and frequency range to maintain stability. At the same time, silica gel has good resistance to high voltage corona discharge and arc discharge.

6. It has good low temperature resistance and good elasticity.

7, with good electrical conductivity

8, with good weather resistance, not affected by ozone, in ultraviolet and other weather conditions for a long time physical properties only small changes.

9, its thermal conductivity is good.

10, with good radiation resistance.

11, the color is diverse, you can need to customize different colors.

How to tell the real silicone from the fake?

1. Smell

Silicone products themselves are non-toxic and tasteless, but in the production process need to add curing agent to bring smell, slight smell is normal. But the smell of a long time or pungent can be identified as inferior quality.

2. Elasticity

Silicone has excellent resilience, gently pull can achieve rapid rebound recovery as before. No elasticity a pull deformation is also one of the performance of inferior quality. By stretching whether white can also distinguish the use of raw materials whether food grade silicone, ordinary glue will be white.

3, no burr edge

Silicone products need to be dismantled after production and processing. Manufacturers with strict quality control can achieve smooth edges without bumps. Small workshops or strength manufacturers can be distinguished through product edges.

4. Wear resistance

Some silicone products will spray a layer of ink on the surface, forming a wear-resistant protective layer. We can wipe gently with white paper, the fading color indicates the product quality is not good.

The application field of silicone

1. Silicone protective cover

Common applications of silicone cover are: Bluetooth speaker cover, tablet computer and other electronic devices

2, food grade silicone

Food grade silicone is mainly used in the field of children's products, kitchen supplies and other advanced materials, commonly used is children's early childhood pens, silicone bags, silicone toy shovel, silicone gloves, etc.

3. It is used for sealing the ash door under the gas making furnace

4, used for chemical plant valve, valve stem seal

5. Make photocopier, keyboard, electronic dictionary, remote control, toys, silicone keys, etc.

6, for the production of durable shape molding gasket, electronic parts packaging materials, automotive electronic parts maintenance materials.

7, used for the production of electronic components, molding high pressure edge.

8, used for making conductive silicone, medical silicone, foam silicone, mold silicone, etc.

9, for the construction and repair of houses, highway joint sealing, bridge sealing and other sealing works.

10, for the production of kitchen products, kitchenware and related auxiliary kitchenware products.

11, for medical equipment accessories, silicone is widely used in the medical industry because of its colorless, odorless and non-toxic characteristics.