What is Natural rubber ?

Natural rubber is a natural polymer compound with polyphonin as its main ingredient. The molecular formula is (C5H8) N. 91%to 94%of its composition is rubber hydrocarbon (polyphonone). Non -rubber substances such as fatty acids, gray, and sugar. Natural rubber is the most widely used universal rubber
The natural rubber that we usually call is elastic solids made from the natural rubber trees collected from the Brazilian rubber tree through the processing processes such as solidification and drying. Natural rubber is a natural polymer compound with polyterane as its main ingredient.
Its rubber hydrocarbons (polyterane) content is more than 90%, and it also contains a small amount of protein, fatty acids, sugar and gray

About 2,000 different plants in the world can produce a polymer similar to natural rubber, which have obtained different types of rubber from 500 of them. When the surface of the rubber tree is cut, the milk tube in the bark is cut off, and the glue milk flows out of the tree. The latex collected from the rubber tree is diluted, add acid solidification, washing, and then pressing, drying, and packing, that is, the commercially available natural rubber. Natural rubber can be made into smoke, air -dried films, slices, technical graded gels and concentrated glue according to different glue methods.

Standard rubber or granular gel is a new natural rubber variety developed in the 1960s. In the past, the traditional products of general cigarette films, slices, and air -dried films were bound to the development of natural rubber in terms of grading methods and manufacturing methods. Therefore, Malaysia started the standard rubber plan in 1965, and developed the production of granular rubber on the basis of the use of raw collagen performance. Standard rubber refers to graded rubber based on mechanical impurities, plastic retention, plastic initial value, nitrogen content, gray method content, gray content, and color index for grading. Standard rubber packaging is also relatively advanced. Generally, polyethylene film packaging is generally packed and has a clear logo. The weight of the package is small and easy to move. Malaysian packaging weight is 33.3kg, and my country stipulates 40kg.

The natural rubber that we usually call is elastic solids made from the natural rubber trees collected from the Brazilian rubber tree through the processing processes such as solidification and drying. Natural rubber is a natural polymer compound with polyterane as its main ingredient. The molecular formula is (C5H8) N. Its rubber hydrocarbon (polyterane) content is more than 90%, and it also contains a small amount of protein, fatty acids, fatty acids , Sugar and gray.

Physical characteristics of natural rubber. Natural rubber has high elasticity at room temperature, slightly plastic, with very good mechanical strength, lagging losses, and low heat at multiple deformation. Therefore Rubber, so the electrical insulation performance is good.

The chemical characteristics of natural rubber. Because there are unsaturated double bonds, natural rubber is a substance with strong chemical reactions. Light, heat, ozone, radiation, flexion deformation, and copper, manganese and other metals can promote the aging of rubber. The fatal weakness of the rubber, but the natural rubber that adds an old agent is added, and sometimes it can not be seen in the sun for two months. It can still be used as usual after three years in the warehouse.

Natural rubber -resistant characteristics. Natural rubber has a good alkali resistance, but it is not resistant to strong acid. Because natural rubber is non -polar rubber, it can only resist some polar solvents, and it is swollen in non -polar solvents. Therefore, its oil resistance and solvent resistance are poor. Generally speaking , Advanced ketone and advanced fatty acids have dissolved effects on natural rubber, but their solubility is affected by plastic and refining, while low -grade ketones, low -grade esters and alcohols are non -solvents for natural rubber.

The structure of natural rubber is mainly the chain structure of the macromolecular, molecular weight and its distribution and clustering state structure. The large molecular chain structure unit of natural rubber is isoprene. It accounts for more than 97 %, and its molecular chain has aldehydes. There is an average of one on each large molecule chain. The viscosity in the storage is increased, and the natural rubber macromolecular chain also has epoxyl, which is more active.

The macromolecular end of the natural glue is generally axyl propylene, and the other end is very few elements of the aldehyde group, the aldehydes, and the polymerization of the polymeter, the molecular chain, and the distribution of the natural rubber. The range of its molecular weight is relatively wide. According to foreign reports, most molecular weights are about 30,000. Natural raw glue, mixed glue, and sulfurization strength are relatively high. Generally, natural rubber strength can reach three mega Pa.

The main reason for the high mechanical strength of natural rubber is that it is a self -replenishment of strong rubber series. When stretching, it will crystallize the direction orientation of the large molecular chain along the stress direction. The reason for the same high strength is caused by the tight condensation of tiny particles in its internal structure.

Natural rubber can be divided into two categories according to the form: solid natural rubber (film and granular gum) and concentrated glue. In daily use, solid natural rubber accounts for most of the proportion.

The film can be divided into smoke film glue, air -dried film, white tip, brown pornography, etc. according to the manufacturing process and shape. Smoke glue is the most representative variety in natural rubber. It has always been a large -scale and widely used glue species. Smoke tape glue is generally classified according to the shape, divided into special, first, second, third, and fourth levels. There are six levels such as level 5, and those who fail to reach level 5 are listed as equal glue.

Granular gel (that is, standard glue) is graded according to the unified international physical and chemical efficiency and indicators. These physical and chemical properties include impurities, plastic initial values, plastic maintenance rates, nitrogen content, volatile content, gray content, and color index index. The items are dominated by impurities, and they are divided into five levels: 5L, 5, 10, 20, and 50 according to the amount of impurities.

Because natural rubber has the above series of physical and chemical characteristics, especially its excellent reflection elasticity, insulation, water separation, and plasticity, and after appropriate treatment Pressive and wear -resistant valuable properties, so it is widely used. For example, raindrops, warm water bags, and loose bands used in daily life; surgeon gloves, vastrophic, and condoms used in the medical and health industry; various tires used in transportation; transportation belts, transportation belts, acid resistance and resistance of acidity in the industry; Alkaline gloves; agricultural irrigation tube, ammonia water bag; air balloon used for meteorological measurement; sealing and earthquake -proof equipment for scientific tests; aircraft, tanks, cannons, anti -virus masks used on national defense; High -precision science and technology products such as spacecraft are inseparable from natural rubber.

The results of modern scientific research have proven that ordinary natural rubber is aggregated by heterodiene.

(1) The chemical properties of natural rubber Natural rubber is unsaturated rubber, which is prone to sulfide reactions (structural reactions) with vulcanizers. Oxidation and cracking reactions occur with oxygen and ozone. Chemical reactions under the action of acid.

However, because natural rubber is a polymer compound, it has the reaction characteristics of the organic compounds, such as slow reaction speed, incomplete response and unevenness. At the same time, it has a variety of chemical reactions )Wait.

Among the various chemical reactions of natural rubber, the most important thing is the oxidation cracking response and structured reaction. The former is the theoretical basis for plastic gums to be plastic and processed, and the cause of the aging of folic acid rubber; the latter is the theoretical basis for raw glue for vulcanizing processing. Natural rubber's chloride, ringing, hydrogenation and other reactions can be applied to the modification of natural rubber.

(2) Natural rubber has excellent comprehensive physical mechanical properties. Natural rubber has good elasticity at room temperature. This is because the natural rubber molecular chain is in a non -fixed state at room temperature and the molecular chain is flexible. Its density is 0.913g/cm, and the elastic modulus is 2-4MPa, which is about one-30,000th of the steel, and the elongation rate is 300 times that of steel, up to 1,000%. In the range of 0-100 degrees, the rebound of natural rubber can reach more than 50%-85%.

(3) The normal natural rubber room temperature of the heat is high elastic body, and the glass has a temperature of -72 degrees. After heating, it slowly softes. It starts to flow at 130-140 degrees.

(4) The resistance medium refers to the chemicals of oil and liquid. Natural rubber is not resistant to rodane, gasoline, benzene, etc., insoluble in polar acetone, ethanol, etc., insoluble in water, 10%hydrofluoric acid, 20%hydrochloric acid, 30%sulfuric acid, 50%sodium hydroxide Wait. Elementary acid and oxidized potassium permanganate, potassium thorium, and so on.

(5) Good processing process performance Natural rubber Due to high relatively high molecular mass and a wide range of molecular mass distribution, the molecular chain is easy to break, and a certain amount of gel molecules in raw glue are easily plastic and mixed. , Pressure, pressing, molding, etc.

In 1492, before Goronbu discovered the Americas, local residents in Central America and South America had begun to use.

In 1736, it was not until 1736 that France first reported in the world for the origin of rubber, the method of collecting glue, and the local use of rubber in South America, so that Europeans began to understand natural rubber and further study its utilization value.

After more than 100 years since 1839, it was discovered by the United States C.Goodyear in 1839 that the sulfur and alkaline lead carbonate were added to the rubber. It is no longer as easy to become soft and sticky as in the past, and can maintain good elasticity, which invented the sulfurization of rubber. At this point, natural rubber has really been confirmed that its special use value has become an important industrial raw material.

In 1888, J.B.DunLop invented the inflatable tires, which prompted the development of the car tire industry to develop, which led to a sharp increase in glue.

In 1876, the British H.Wickham collected rubber seeds from the Malaysian estuary of Brazil, transported back to the Royal Botanical Garden for sowing, and trials in Ceylon (Sri Lanka), Indonesia, and Singapore, all succeeded. This is the beginning of the Brazilian rubber tree settled in the Far East. Since then, the development of the cultivation rubber industry has developed very quickly. The world's natural rubber output in 1997 reached 6.247 million tons.

Now in Annego company, we mainly use it to produce mouse pads, gaming mats, desk mats, yoga mats, floor mats,and bar mats.