Method for increasing drying efficiency of natural rubber

Abstract

A method for improving the drying efficiency of natural rubber. During the coagulation process of acid coagulated natural rubber and microbial coagulated natural rubber, nano silicon dioxide suspension is added, coagulated and dried. Form a lot of polar "moisture channels" in hydrophobic natural rubber to improve the quality of natural rubber. The drying efficiency of the natural rubber in the invention is increased by about 20%, and the energy consumption is reduced by about 20%. The color of the obtained natural rubber is golden yellow and very dry, and its quality meets the quality standard of Chinese standard natural rubber No. 5 rubber. The initial value of plasticity P0 is between 35 and 42, the plasticity retention rate PRI is ≥ 75, and the nitrogen content is lower than ≤ 0.54 %, volatile content ≤ 0.70%, ash content ≤ 0.54%; Mooney viscosity of raw rubber is between 75-79. The product has excellent vulcanization performance, good physical properties of vulcanized rubber, high mechanical strength and high tear resistance.

Description

technical field

[0001] The invention belongs to a primary processing method of natural rubber, in particular to a method for improving the drying efficiency of natural rubber. Background technique

[0002] The whole process of primary processing of natural rubber is actually a process of coagulation of natural latex, mechanical extrusion and granulation of rubber clots, and hot air drying and dehydration. Hours, high energy consumption, and great difficulty are the most critical and costly processes in natural rubber making. This is because, on the one hand, natural rubber is a hydrophobic substance, and during the drying process, the moisture inside is wrapped by hydrophobic natural rubber, making it difficult to diffuse out; on the other hand, the molecular structure of natural rubber is cis-polyisoprene Diene, because its molecule contains a lot of double bonds, the rubber surface is easily oxidized and sticky during the drying process, forming a dense oxide film, which ...

Examples

Embodiment 1

[0014] Add 100-250 grams of diethylene glycol and 25-100 grams of sodium lauryl sulfate or sodium dodecyl sulfate into 5 liters of deionized water, and stir evenly. Under the action of an ultrasonic oscillator, slowly add 0.03 to 0.24 kg of nano silicon dioxide to the above solution, with a particle size range of 10 nm to 100 nm. After a stable suspension is formed, slowly add the above stable suspension to 100 Kilograms of natural rubber latex, stir until uniform. Park the latex at room temperature for 24-48 hours to naturally solidify the latex, take out the rubber clot, tablet and granulate, wash, and dry on a drying line. The drying time is about 80% of that of the control process sample without adding nano-silica suspension. The color of the obtained natural rubber is golden yellow and very dry, and its quality meets the quality standard of the Chinese standard natural rubber No. 5 rubber. The specific quality index is, the initial value of plasticity P 0 Between 35 and ...

Embodiment 2

[0016] Add 100-250 grams of diethylene glycol and 25-100 grams of sodium lauryl sulfate or sodium dodecyl sulfate into 5 liters of distilled water of deionized water, and stir evenly. Under the action of an ultrasonic oscillator, slowly add 0.03 to 0.24 kg of nano-silicon dioxide into the above solution, with a particle size ranging from 10 nm to 100 nm, until a stable suspension is formed. Slowly add the above stable suspension to 100 kg of natural rubber latex, stir, and after stirring evenly, add 5 liters of acetic acid with a concentration of 3%, mix well, and let the latex fully solidify for 5-8 hours, then take out the rubber gel block, tableted and granulated, washed, and dried on the drying line, and the drying time is about 80% of that of the control process sample without adding nano-silica suspension. The color of the obtained natural rubber is light golden yellow and very dry, and its quality meets the quality standard of Chinese standard natural rubber No. 5 rubbe...

technical field

[0001] The invention belongs to a primary processing method of natural rubber, in particular to a method for improving the drying efficiency of natural rubber. Background technique

[0002] The whole process of primary processing of natural rubber is actually a process of coagulation of natural latex, mechanical extrusion and granulation of rubber clots, and hot air drying and dehydration. Hours, high energy consumption, and great difficulty are the most critical and costly processes in natural rubber making. This is because, on the one hand, natural rubber is a hydrophobic substance, and during the drying process, the moisture inside is wrapped by hydrophobic natural rubber, making it difficult to diffuse out; on the other hand, the molecular structure of natural rubber is cis-polyisoprene Diene, because its molecule contains a lot of double bonds, the rubber surface is easily oxidized and sticky during the drying process, forming a dense oxide film, which ...

Examples

Embodiment 1

[0014] Add 100-250 grams of diethylene glycol and 25-100 grams of sodium lauryl sulfate or sodium dodecyl sulfate into 5 liters of deionized water, and stir evenly. Under the action of an ultrasonic oscillator, slowly add 0.03 to 0.24 kg of nano silicon dioxide to the above solution, with a particle size range of 10 nm to 100 nm. After a stable suspension is formed, slowly add the above stable suspension to 100 Kilograms of natural rubber latex, stir until uniform. Park the latex at room temperature for 24-48 hours to naturally solidify the latex, take out the rubber clot, tablet and granulate, wash, and dry on a drying line. The drying time is about 80% of that of the control process sample without adding nano-silica suspension. The color of the obtained natural rubber is golden yellow and very dry, and its quality meets the quality standard of the Chinese standard natural rubber No. 5 rubber. The specific quality index is, the initial value of plasticity P 0 Between 35 and ...

Embodiment 2

[0016] Add 100-250 grams of diethylene glycol and 25-100 grams of sodium lauryl sulfate or sodium dodecyl sulfate into 5 liters of distilled water of deionized water, and stir evenly. Under the action of an ultrasonic oscillator, slowly add 0.03 to 0.24 kg of nano-silicon dioxide into the above solution, with a particle size ranging from 10 nm to 100 nm, until a stable suspension is formed. Slowly add the above stable suspension to 100 kg of natural rubber latex, stir, and after stirring evenly, add 5 liters of acetic acid with a concentration of 3%, mix well, and let the latex fully solidify for 5-8 hours, then take out the rubber gel block, tableted and granulated, washed, and dried on the drying line, and the drying time is about 80% of that of the control process sample without adding nano-silica suspension. The color of the obtained natural rubber is light golden yellow and very dry, and its quality meets the quality standard of Chinese standard natural rubber No. 5 rubbe...