Knowledge of nature rubber

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Knowledge of nature rubber
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. q4 D/ R9 Y) {/ C6 a: YNaturE rubber is an elastomer (an elastic hydrocarbon polymer) that was originally derived from a milky colloidal suspension, or latex, found in the sap of some plants. The purified form of natural rubber is the chemical polyisoprene, which can also be produced synthetically. Natural rubber is used extensively in many applications and products, as is synthetic rubber.
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Natural rubber glue the glass temperatures of -72 ℃, plastic-temperature 130 ℃, the temperature started to decompose 200 ℃, intense decomposition temperature of 270 ℃. When natural rubber vulcanization, increased its Tg, viscous flow will not happen again.
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# {% W) s, P5 \! MThe flexibility of its natural rubber and rubber Health crosslinking density is not too high a vulcanizate of flexibility is high. For example, in the 0 -100 ℃ within the framework of elasticity in the 50 -85 ℃, and its elastic modulus of only 1 / 3000, elongation of up to 1,000 percent, stretching to 350%, after the retractable permanent Deformation only 15 percent, the flexibility of higher natural rubber, rubber in the second only to GM in the butadiene rubber.

The strength of natural rubber in the elastic material, natural rubber Health and plastic, mix, the strength of vulcanized rubber relatively high. Vulcanized rubber is not known as the tensile strength of Green's strength, natural rubber Green's strength up to 1.4 ~ 2.5Mpa, the appropriate strength of the Green molding rubber processing is necessary. Natural rubber tear strength is also higher, up to 98 kN / m, its wear resistance is better. Natural rubber for the high mechanical strength is that it is self-reinforced rubber, when the time will macromolecules chain stretching along the direction of stress formation of crystal orientation.

; o3 m0 l: x: F' \The electrical properties of natural rubber natural rubber non-polar material, is a good insulating material. When natural rubber vulcanization, due to the introduction of polar factors, such as sulfur and promoting agent, so that insulation performance decline.
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Natural rubber medium-resistant properties of natural rubber is a non-polar material, it dissolved in non-polar and non-polar solvent oil. Intolerance cyclohexane natural rubber, gasoline, benzene and other media, not vulcanizate in the medium of dissolution, vulcanized rubber is swelling. Natural rubber do not dissolve in the polar acetone, alcohol, the more insoluble in water, 10 percent of the hydrofluoric acid-resistant, 20 percent of hydrochloric acid, 30 percent of the sulfuric acid, sodium hydroxide, such as 50% of.

Natural rubber because of a strong flexibility and good insulation, plastic, Geshui separated from gas, tensile and wear-resistant characteristics, widely used in industry, agriculture, defense, transportation, transport, machinery manufacturing, medical and health fields , And other aspects of daily life, such as transport, with the tire; industry with the transport belt, belts, all kinds of seals; medical gloves, the loser vascular; used in the daily life of the shoes, raincoats, and so are Nuanshui Dai Rubber as the main raw materials to manufacturing, national defense, the use of the aircraft, artillery, tanks, or even cutting-edge technology in the field of rockets, satellites, spacecraft, space shuttle and so requires a large amount of rubber parts.

wilson_wx

谢谢楼主分享资料了                。

剑走偏锋

天然橡胶的知识？
4 F- z/ h  L" l4 sMy English is not very good, very hard!

无绪

Your English is good, just need more pratice.

之见

女胶友英语水平普遍高！

hk19840511

翻译一下，锻炼锻炼英文

1 ?+ {. a" ~! q; A8 m' D% i5 h第一段：天然胶（一种碳氢聚合物弹性体）最早从一些植物的树液，胶乳，或者说是像牛奶一样的胶质液中得到。天然胶的成分是聚异戊二烯，可以人工合成得到，现在天然胶像合成橡胶一样在很多领域和产品中被使用。
! I& ?% b4 `8 }$ i9 \* d- w) ^) i$ e8 x第二段：天然胶的玻璃化温度是-72度，粘流态温度：130度，在温度超过200度后降解，温度超过270度后剧烈降解。当天然胶硫化后玻璃化温度会适当升高，并且粘流态不会再出现。
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8 `% _' f3 T1 x% f; ~先翻译到这里，以后有空再继续。
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文章好像有点错误，天然胶的分解温度好像没有200度这么高，155度的时候已经开始分解了。并且粘流态的问题和玻璃化温度好像都有点问题。
新增：
这篇文章是楼主自己写的还是直接用汉语翻过来的，我仔细看了一下下面几段，有点问题啊，竟然有Nuanshui Dai这个英文，我:L

这个资料还是楼主自己留作参考吧