Method for extracting latex, method for cultivating plant of asteraceae family, method for producing pneumatic tire, and method for producing rubber product
The present invention provides a method for extracting latex from a plant of the Asteraceae family and a method for cultivating a plant of the Asteraceae family, which allow such plants to be reused. The present invention relates to a method for extracting latex including a cutting step of cutting roots of a plant of the Asteraceae family in such a manner that the roots are partly left on the plant.
1. A method for cultivating a plant of the Asteraceae family, comprising:
a cutting step of cutting roots of a plant of the Asteraceae family in such a manner that the roots are partly left on the plant after the plant has been removed from a soil or a hydroponic culture;
a latex extraction step of extracting latex from the cut roots;
a transpiration-suppressed cultivation step of cultivating the plant whose roots have been cut in the cutting step under conditions where the plant has been subjected to a treatment of suppressing transpiration;
a step of replanting the plant whose roots have been cut in the cutting step; and
a step of performing the cutting step and the latex extraction step again using the plant grown by the transpiration-suppressed cultivation step.
2. The method for cultivating a plant of the Asteraceae family according to claim 1 , wherein the cutting step includes cutting the roots in such a manner that each root left on the plant has a length of 5.0 cm or less.
3. The method for cultivating a plant of the Asteraceae family according to claim 1 , wherein the treatment of suppressing transpiration is carried out by cutting leaves.
4. The method for cultivating a plant of the Asteraceae family according to claim 1 , wherein the treatment of suppressing transpiration is carried out by cutting leaves in such a manner that each leaf left on the plant has a length of 2.0 to 4.0 cm.
5. The method for cultivating a plant of the Asteraceae family according to claim 1 , wherein the transpiration-suppressed cultivation step is carried out at a cultivation temperature of 16° C. to 30° C.
6. The method for cultivating a plant of the Asteraceae family according to claim 1 , wherein the transpiration-suppressed cultivation step is carried out with an illuminance at the level of leaves set to 7000 to 20000 lx.
7. The method for cultivating a plant of the Asteraceae family according to claim 1 , wherein the transpiration-suppressed cultivation step is carried out with a photoperiod of 12 hours or longer.
8. The method for cultivating a plant of the Asteraceae family according to claim 1 , wherein the plant of the Asteraceae family is a plant of the genus Teraxacum.
9. The method for cultivating a plant of the Asteraceae family according to claim 5 , wherein the plant of the Asteraceae family is Taraxacum kok - saghyz.
10. A method for producing a pneumatic tire, comprising:
a cutting step of cutting roots of a plant of the Asteraceae family in such a manner that the roots are partly left on the plant after the plant has been removed from a soil or a hydroponic culture;
a latex extraction step of extracting latex from the cut roots;
a transpiration-suppressed cultivation step of cultivating the plant whose roots have been cut in the cutting step under conditions where the plant has been subjected to a treatment of suppressing transpiration;
a step of replanting the plant whose roots have been cut in the cutting step;
a step of performing the cutting step and the latex extraction step again using the plant grown by the transpiration-suppressed cultivation step;
a step of preparing a rubber from the latex;
a kneading step of kneading the rubber with additives to give a kneaded mixture;
a raw tire formation step of forming a raw tire from the kneaded mixture; and
a vulcanization step of vulcanizing the raw tire.
11. A method for producing a rubber product, comprising:
a cutting step of cutting roots of a plant of the Asteraceae family in such a manner that the roots are partly left on the plant after the plant has been removed from a soil or a hydroponic culture;
a latex extraction step of extracting latex from the cut roots;
a transpiration-suppressed cultivation step of cultivating the plant whose roots have been cut in the cutting step under conditions where the plant has been subjected to a treatment of suppressing transpiration;
a step of replanting the plant whose roots have been cut in the cutting step;
a step of performing the cutting step and the latex extraction step again using the plant grown by the transpiration-suppressed cultivation step;
a step of preparing a rubber from the latex;
a kneading step of kneading the rubber with additives to give a kneaded mixture;
a raw rubber product formation step of forming a raw rubber product from the kneaded mixture; and
a vulcanization step of vulcanizing the raw rubber product.
12. The method for cultivating a plant of the Asteraceae family according to claim 2 , wherein the cutting step includes cutting the roots in such a manner that each root left on the plant has a length of at least 2.5 cm.
13. The method for cultivating a plant of the Asteraceae family according to claim 1 , wherein the treatment of suppressing transpiration is carried out by cutting leaves in such a manner that the leaves in the vicinity of the boundary between the stems and the roots are left on the plant.