天然胶丁晴胶氟胶特性Natural rubber NBR fluorine gum characteristicsWord文件下载.docx

1、2, according to the form is divided into block rubber, latex, liquid rubber and rubber powder.3, according to the use of divided into general and special type.The general rubber has good comprehensive properties and is widely used. The main contents are as follows: natural rubber. Isoprene rubber, a

2、lso called synthetic natural rubber. Styrene butadiene rubber, referred to as SBR. The butadiene rubber, referred to as BR.Nitrile rubber, referred to as NBR.Prepared by copolymerization of butadiene and acrylonitrile. With good oil resistance, heat resistance, cold resistance, pressure resistance a

3、nd water resistance, air tightness and excellent bonding properties, and abrasion resistance is suitable, the temperature is approximately 40 DEG C 120 commonly used, can be used for a long time at the temperature of 120 DEG C in the air or oil at 150 c.It is easy to use metal to mould the hydraulic

4、 seals in any shape. Therefore, NBR is most suitable for making seals for hydraulic cylinders whose working pressure is not greater than 32Mpa. Specially designed formula, easy to press hair oil: wearable, can bear the mechanical axis speed of the car 3000 rpm / below （at this time the rubber hardne

5、ss is 70 degrees）.Silicone rubber. SILICONEThe backbone consists of alternating atoms of silicon and oxygen, with organic groups on silicon atoms. High and low temperature, ozone resistance, good electrical insulation. Use temperature of - 40 DEG C +220 DEG C; in high temperature, oil resistant, abr

6、asion resistance, oil resistance! The utility model is especially suitable for the crankshaft oil seal in the automobile engine, which is not resistant to temperature and volatile oil （diesel, gasoline）, and has the resistance to oxygen, ozone and sunlight （ultraviolet light）.Fluorine rubber. VitonA

7、 synthetic rubber containing fluorine atoms in a substructure. Usually, the number of fluorine atoms in the fluorine containing unit in the copolymer is expressed as fluorine rubber 23, and the copolymer is two vinylidene fluoride and three fluorine vinyl chloride. Fluorine rubber, high temperature,

8、 oil resistance, chemical resistance. It is resistant to oil, high temperature, chemical resistance, and has the characteristics of acid and alkali resistance. Use temperature - 30 +280. The utility model is suitable for a crankshaft oil seal in a jet engine, a timing oil seal and a O ring and a sea

9、ling ring used for chemicalsCharacteristics of silica gelIt is divided into coarse pore silica gel and fine pore silica gelSilica gel can absorb water, and can also absorb acetylene and carbon dioxide. With the decrease of temperature, the first adsorption is water （at normal temperature, about 25 D

10、EG C）, followed by acetylene and carbon dioxide （the lower the temperature, the stronger the adsorption capacity）.Taking adsorption water as an example, the particle size ranged from /mm4 to 8, and the dynamic adsorption capacity was /%6 to 8. After drying, the air moisture content was /g, M-3 0.03,

11、 and the air dew point / temperature was -52 after dryingRegeneration temperature / temperature 140160Silica gel has larger adsorption capacity for water, lower regeneration temperature and cheaper price, so silica gel is mainly used as adsorbent to adsorb carbon dioxide and acetylene at low tempera

12、ture in air separation unit. Its disadvantage is that more powder.There are two kinds of silica gel pore and pore, and the two are different in diameter. The pore size of crude silica gel is 5 10nm （1nm=10-9m, NM）, and the specific surface area of silica gel is 100 to 300m2/g per gram. It has strong

13、 water absorption ability and is not easy to be broken after absorbing water,Good mechanical strength, often used in the dryer to absorb moisture. The pore diameter of pore silica gel is 2.5 4nm, and the specific surface area is 400 600m2/g. Commonly used to absorb carbon dioxide and acetylene, adso

14、rption water easily broken. The adsorption process is carbon dioxide adsorber in -110 -120 under low temperature, good adsorption effect of CO2, also can adsorb acetylene. Because the temperature lower than -130 DEG C carbon dioxide solid precipitation, solid carbon dioxide not only adsorbed silica

15、gel, and will plug the adsorber. The adsorption of acetylene is carried out in liquid air and oxygen in the adsorber, the adsorption temperature at -170 -180 degrees celsius.Three yuan ethylene propylene rubber is a kind of rubber made by copolymerization of ethylene and propylene through solution,

16、and then third monomer （ENB） is introduced. Three yuan ethylene propylene rubber is basically a saturated polymer, aging resistance is very good, good weather resistance, good electrical insulation performance, good chemical resistance, good impact elasticity. The main disadvantage of ethylene propy

17、lene rubber is its slow curing rate. It is difficult to use with other unsaturated rubber, and its adhesion and adhesion are very poor, so the processing performance is not good.According to the characteristics of ethylene propylene rubber, mainly used in the requirements of aging resistance, water

18、resistance, corrosion resistance, electrical insulation in several areas, such as light for tire sidewall, heat resistant conveyor belt, wire and cable, anti-corrosion lining, gasket, building waterproof sheet, seal doors and windows, household appliances and accessories, plastic modification. Prope

19、rties and applications of ethylene propylene rubber.Ethylene propylene rubber is mainly made from ethylene and propylene. It is resistant to aging, electrical insulation and ozone resistance. Ethylene propylene rubber can be filled with oil and filled with carbon black. The price of the product is l

20、ow, and the chemical stability of the ethylene propylene rubber is good. The abrasion resistance, elasticity, oil resistance and the proximity of styrene butadiene rubber are close. Ethylene propylene rubber is widely used. It can be used as the tire side, rubber strip and inner tube, as well as par

21、ts of automobiles. It can also be used as wires, cables, wrapping and high voltage and extra high voltage insulation materials. Can also manufacture and shoes, sanitary products and other light colored products. Properties and improvement of ethylene propylene rubber:One, 1, low density, high fillin

22、gThe density of ethylene propylene rubber is a kind of lower rubber, its density is 0.87. Coupled with the large oil filled and filled, thereby reducing the cost of rubber products, make up for the shortcomings of high price of ethylene propylene rubber, EPDM rubber and high Mooney value, high filli

23、ng after mechanical can decrease slightly.2, aging resistanceEthylene propylene rubber has excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, electrical properties, oil filling and room temperature mobility. Ethylene

24、propylene rubber products can be used at 120 degrees for a long time and can be used briefly or intermittently at 150-200 degrees centigrade. Adding suitable antioxidant can improve the use of temperature. Peroxide crosslinked three yuan ethylene propylene rubber can be used in harsh conditions. Thr

25、ee yuan ethylene propylene rubber in ozone concentration 50pphm, stretch 30% conditions, up to 150h or more, not cracking.3, corrosion resistanceDue to the lack of polar ethylene propylene rubber, low unsaturation, and various polar chemicals such as alcohol, acid, alkali, oxidant, refrigerants, det

26、ergents, animal and vegetable oils, ketone and fat were high resistance; but in the genus and genus of aromatic lipid solvent （such as gasoline, benzene） and mineral poor stability oil.Under the long-term action of concentrated acid, the performance will also decline. In ISO/TO 7620 in a collection

27、of data of nearly 400 kinds of corrosive gas and liquid chemicals on various rubber performance function, and the provisions of the 1-4 grade indicates the degree of the effect, effect of corrosive chemicals on the properties of rubber:Level volume swelling /% lower hardness values influence on prop

28、erties1, 10, 10, slight or absent210-20, 20 smaller330-60. 30 medium4 60 30 serious4, steam resistanceEthylene propylene rubber has excellent water vapor resistance and is superior to its heat resistance. In superheated steam at 230 DEG C, there is no change in appearance after 100h. While fluorine

29、rubber, silicone rubber, fluorine silicone rubber, butyl rubber, nitrile rubber and natural rubber under the same conditions, experienced a short time, the appearance of obvious deterioration.5 、 resistance to hot water performanceEthylene propylene rubber has better resistance to over heated water,

30、 but it is closely related to all vulcanization systems. In two two TMTD for curing morpholine, ethylene propylene rubber vulcanization system, 125 degrees in the superheated water immersion after 15 months, the change of mechanical properties is very small, the volume expansion rate of only 0.3%.6,

31、 electrical performanceEthylene propylene rubber （EPR） has excellent electrical insulation and corona resistance, and its electrical properties are better than or near styrene butadiene rubber, CSM, polyethylene and xlpe.7, elasticityBecause there is no polar substituents of ethylene propylene rubber molecular structure, the molecular cohesive energy of low molecular chain can maintain flexibility in a wide range, after discussion a