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Natural rubber in the storage, transport process of rubber molecular chain on the aldehyde group condensaion reaction, results in the plasticity initial value, mooney viscosity and other indicators gradually increased, plasticity retention rate gradually decreased, making it more difficult to increase the plasticizing and mixing processes of natural rubber, and reduces the oxygen aging resistance of the rubber. It is necessary to prepare natural rubber with constant viscosity to reduce the condensation of aldehyde groups in the molecular chain of natural rubber. Alkylhydrazine (OP) solution was used to soak natural rubber by microbial coagulation to analyse the effects of OP solution concentration and wet film soaking time on the physical and chemical indexes, vulcanization characteristics, physical and mechanical properties of natural rubber, plasticity initial value, plasticity retention rate and mooney viscosity hardening value of natural rubber during storage. The results showed that plasticity initial value and mooney viscosity of natural raw rubber increased first and then decreased with the increase of the concentration of OP solution, but the plasticity retention rate was opposite. During the accelerated storage process, the plasticity initial value and mooney viscosity of natural raw rubber soaked in different concentrations of OP solution increased, while its plasticity retention rate decreased. With the increase of OP solution concentration, the hardening value of plasticity initial value, plasticity retention rate and mooney viscosity gradually decreased. With the concentration of OP solution ≥0.5%, the hardening value of plasticity initial value and mooney viscosity were ≤5. The effect of wet film soaking time on the physical and chemical indexes of natural raw rubber and the hardening values of the plasticity initial value, plasticity retention rate and mooney viscosity was not obvious. Compared with the control sample P0, the natural rubbers (P7, P8, and P9) soaked in 0.5% concentration of OP solution had slightly higher torque difference values ΔM of their blends, the tensile strength and tear strength of vulcanized rubber increased by 4.5%–14.2% and 3.0%–8.5%, respectively. In addition, the soaking time of wet film had a significant effect on the torque difference ΔM of the rubber and the tensile strength and tear strength of the vulcanized rubber. OP solution had a good constant viscosity effect on natural rubber. 0.5% concentration of OP solution soaked natural rubber had excellent physical and mechanical properties, and the production process was simple, not causing the waste of constant viscosity agent and the pollution of the production workshop, surrounding environment, easy to large-scale promotion and application.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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