High-performance natural rubber and preparation method thereof

Abstract

The present invention relates to the field of rubber technology, and more specifically to a high-performance natural rubber and a method for preparing the same. The present invention utilizes specific bacterial species, Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290, and adds functional raw materials, calcium chloride, sodium lauryl polyoxyethylene ether sulfate, and sodium stearate. The pH is adjusted, and the rubber is then fermented, matured, creped, cut, aired, and dried to produce the natural rubber. The natural rubber produced by the present invention exhibits excellent tensile strength and tear strength, as well as good elongation at break. The natural rubber exhibits excellent physical and mechanical properties and has promising application prospects.

Description

Technical Field

[0001] The present invention relates to the field of rubber technology, in particular to a high-performance natural rubber and a preparation method thereof. Background Art

[0002] Natural rubber refers to the elastic solid made from natural latex collected from rubber trees through coagulation, drying and other processing procedures. It is a natural high molecular compound with cis-1,4-polyisoprene as the main component, with the molecular formula (C5H8)n. Its rubber hydrocarbon (cis-1,4-polyisoprene) content is more than 90%, and it also contains small amounts of protein, fatty acids, sugars and ash impurities.

[0003] Natural rubber possesses a range of excellent physical properties, such as good resilience, insulation, tear resistance, and plasticity, and is widely used in various fields. While NR possesses certain characteristics, impurities and other defects contribute to its insufficient strength and elongation, which still cannot meet application requirements, limiting its application. Summary of the Invention

[0004] The present invention is based on solving the above technical problems, and thus provides a technical solution of the present invention. The present invention provides a high-performance natural rubber and a preparation method thereof.

[0005] The method for preparing high-performance natural rubber of the present invention comprises the following steps:

[0006] Step 1: Take fresh latex and set aside;

[0007] Step 2: Prepare bacterial suspensions of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290;

[0008] Step 3: Prepare calcium chloride solution; prepare sodium lauryl polyoxyethylene ether sulfate and sodium stearate aqueous solution;

[0009] Step 4: Inoculate the bacterial solution into fresh latex at 15-20°C and stir evenly; then add calcium chloride solution and sodium lauryl polyoxyethylene ether sulfate and sodium stearate aqueous solution and stir evenly; adjust the pH;

[0010] Step 5: Let it stand for fermentation and maturation;

[0011] Step 6: The fermented and matured rubber block is creped, cut into pieces, air-dried, and dried to obtain the high-performance natural rubber.

[0012] Further, in the fresh latex, the dry rubber content is 18-45wt%.The fresh latex can be selected from the natural fresh latex of Hevea brasiliensis.

[0013] Furthermore, the concentrations of the bacterial solutions of Bacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 can be adjusted according to actual needs to ensure the initial concentration of bacteria in the latex.

[0014] Furthermore, the inoculation amount of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 in fresh latex was 3.2×10 12 -6.5×10 12 cfu / g fresh latex; can also be 4×10 12 cfu / g, 5×10 12 cfu / g, 6×10 12 cfu / g, etc.

[0015] Furthermore, the number ratios of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 are 1:2-3.5, 1:2, 1:2.5, 1:3, 1:3.5, and the like.

[0016] Furthermore, the concentration of the calcium chloride solution can be adjusted according to actual needs to ensure the concentration of calcium chloride in the latex. The amount of calcium chloride used can be 0.05-0.3%, 0.06%, 0.08%, 0.1%, 0.2%, 0.3%, etc. based on the mass of the dry rubber.

[0017] Furthermore, the concentrations of the sodium lauryl polyoxyethylene ether sulfate and sodium stearate solutions can be adjusted according to actual needs to ensure that the concentrations of sodium lauryl polyoxyethylene ether sulfate and sodium stearate in the latex are 0.2-0.6%, 0.3%, 0.4%, 0.5%, 0.6%, etc., of the total mass of the sodium lauryl polyoxyethylene ether sulfate and sodium stearate based on the mass of the dry rubber.

[0018] Furthermore, the mass ratio of sodium lauryl polyoxyethylene ether sulfate to sodium stearate is 2-4:1, 2:1, 3:1, 4:1, etc.

[0019] Furthermore, the pH is adjusted to 4-5, 4.3, 4.5, 4.6, 4.7, 4.8, or 5. Formic acid or acetic acid can be used to adjust the pH.

[0020] Furthermore, the fermentation time is at least 8 hours. The fermentation time should not be too long, as it will affect the yield and rubber properties. The fermentation time should not exceed 50 days. For example, the fermentation time can be 10 hours, 20 hours, 1 day, 2 days, 7 days, 10 days, 15 days, etc.

[0021] Furthermore, the ambient temperature during static fermentation can be above 15°C; the ambient temperature cannot be too high, as it affects the fermentation effect and cost, and is preferably below 35°C. For example, the ambient temperature during static fermentation can be 18°C, 20°C, 22°C, 24°C, etc.

[0022] Furthermore, the sheets are dried at room temperature for 2-7 days; the drying temperature is 70-90° C., and the drying time is 20-38 hours.

[0023] The present invention also provides high-performance natural rubber prepared according to the preparation method.

[0024] Beneficial effects:

[0025] The invention adopts specific bacterial species of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290, and adds functional raw materials of calcium chloride, sodium lauryl polyoxyethylene ether sulfate and sodium stearate, adjusts the pH, and then carries out fermentation and aging, creping, sheet cutting, sheet airing and drying to prepare natural rubber.

[0026] The natural rubber prepared by the present invention has excellent tensile strength and tear strength, and has good elongation at break effect. The natural rubber prepared by the present invention has excellent performance and good application prospects.

[0027] The natural rubber prepared by the present invention has a tensile strength of 31.24 MPa, a tear strength of 35.38 MPa, and an elongation at break of 853.78%, and has good performance.

[0028] The specific fermenting bacteria of the present invention effectively improve the comprehensive performance of natural rubber. The combination of the fermenting bacteria Plantarum lactis CICC 6009 and Lactobacillus paracasei CICC 20290 can synergistically improve the performance of natural rubber. The combination of the two fermenting bacteria can effectively reduce impurities in the latex and enrich the rubber with active ingredients such as protein. The acid produced by the fermentation also affects the solidification of the latex, thereby affecting the overall performance of the rubber. The effect is even better when the ratio of Plantarum lactis CICC 6009 to Lactobacillus paracasei CICC 20290 in the system is 1:2-3.5.

[0029] The present invention uses sodium lauryl polyoxyethylene ether sulfate and sodium stearate to enhance the strength and elongation at break of rubber, giving the rubber a promising application prospect; particularly when the ratio of the two is 2-4:1, the effect is even better. Compared with other additives such as sodium lauryl sulfate, the present invention uses sodium lauryl polyoxyethylene ether sulfate and sodium stearate to further enhance the strength and elongation at break of rubber, giving the rubber better performance.

[0030] The natural rubber prepared by the present invention has excellent efficacy, a simple preparation method and good application prospects. DETAILED DESCRIPTION

[0031] The present invention will be described below in conjunction with specific embodiments, and the effects of the present invention will be more clearly presented.

[0032] Lactobacillus plantarum CICC 6009: strain number CICC 6009; Lactobacillus paracasei CICC 20290: strain number CICC 20290; both were purchased from the China Industrial Microbial Culture Collection Center.

[0033] Natural rubber 1:

[0034] The preparation method is as follows:

[0035] Step 1: get Hevea brasiliensis natural fresh latex (dry rubber content is 31.8wt%) 65kg standby;

[0036] Step 2: Prepare bacterial suspensions of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290;

[0037] Step 3: Prepare a 10% calcium chloride solution; prepare an aqueous solution of sodium lauryl polyoxyethylene ether sulfate and sodium stearate with a total mass concentration of 10%;

[0038] Step 4: Inoculate the bacterial solution into 65 kg of fresh latex at 20°C and stir at 75 rpm for 5 minutes. Then, add calcium chloride solution and aqueous solution of sodium lauryl polyoxyethylene ether sulfate and sodium stearate and continue stirring for 15 minutes. Add formic acid to adjust the pH to 4.6.

[0039] Step 5: Let the mixture stand for fermentation and maturation for 3 days at an indoor temperature of 22°C;

[0040] Step 6: Pressing the fermented and matured rubber block into pieces, cutting the pieces into pieces, drying them at room temperature for 4 days, and drying them at 75° C. for 32 hours to obtain the high-performance natural rubber.

[0041] Among them, the inoculation amount of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 in fresh latex was 4.80×10 12 cfu / g fresh latex; the number ratio of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 was 1:3;

[0042] The amount of calcium chloride used is 0.08% of the dry glue mass;

[0043] The total mass of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 0.3% of the mass of the dry rubber; the mass ratio of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 3:1.

[0044] Natural rubber 2:

[0045] The preparation method is as follows:

[0046] Step 1: get Hevea brasiliensis natural fresh latex (dry rubber content is 31.8wt%) 50kg standby;

[0047] Step 2: Prepare bacterial suspensions of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290;

[0048] Step 3: Prepare a 10% calcium chloride solution; prepare an aqueous solution of sodium lauryl polyoxyethylene ether sulfate and sodium stearate with a total mass concentration of 10%;

[0049] Step 4: Inoculate the bacterial solution into 50 kg of fresh latex at 20°C and stir at 80 rpm for 4 minutes; then add calcium chloride solution and aqueous solution of sodium lauryl polyoxyethylene ether sulfate and sodium stearate, and continue stirring for 18 minutes; add acetic acid to adjust the pH to 4.8;

[0050] Step 5: The indoor ambient temperature is 22°C and the fermentation and maturation is carried out for 3.5 days;

[0051] Step 6: Pressing the fermented and matured rubber block into pieces, cutting the pieces into pieces, drying them at room temperature for 5 days, and drying them at 78° C. for 28 hours to obtain the high-performance natural rubber.

[0052] Among them, the inoculation amount of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 in fresh latex was 4.82×10 12 cfu / g fresh latex; the number ratio of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 was 1:2;

[0053] The amount of calcium chloride used is 0.08% of the dry glue mass;

[0054] The total mass of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 0.32% of the mass of the dry rubber; the mass ratio of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 2:1.

[0055] Natural rubber 3:

[0056] The preparation method is as follows:

[0057] Step 1: get Hevea brasiliensis natural fresh latex (dry rubber content is 31.8wt%) 65kg standby;

[0058] Step 2: Prepare the bacterial solution of Lactobacillus plantarum CICC 6009;

[0059] Step 3: Prepare a 10% calcium chloride solution; prepare an aqueous solution of sodium lauryl polyoxyethylene ether sulfate and sodium stearate with a total mass concentration of 10%;

[0060] Step 4: Inoculate the bacterial solution into 65 kg of fresh latex at 20°C and stir at 75 rpm for 5 minutes. Then, add calcium chloride solution and aqueous solution of sodium lauryl polyoxyethylene ether sulfate and sodium stearate and continue stirring for 15 minutes. Add formic acid to adjust the pH to 4.6.

[0061] Step 5: Let the mixture stand for fermentation and maturation for 3 days at an indoor temperature of 22°C;

[0062] Step 6: Pressing the fermented and matured rubber block into pieces, cutting the pieces into pieces, drying them at room temperature for 4 days, and drying them at 75° C. for 32 hours to obtain the high-performance natural rubber.

[0063] The inoculation amount of the inoculated Bacillus plantarum CICC 6009 in fresh latex was 4.80×10 12 cfu / g fresh latex;

[0064] The amount of calcium chloride used is 0.08% of the dry glue mass;

[0065] The total mass of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 0.3% of the mass of the dry rubber; the mass ratio of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 3:1.

[0066] Natural rubber 4:

[0067] The preparation method is as follows:

[0068] Step 1: get Hevea brasiliensis natural fresh latex (dry rubber content is 31.8wt%) 65kg standby;

[0069] Step 2: Prepare a bacterial solution of Lactobacillus paracasei CICC 20290;

[0070] Step 3: Prepare a 10% calcium chloride solution; prepare an aqueous solution of sodium lauryl polyoxyethylene ether sulfate and sodium stearate with a total mass concentration of 10%;

[0071] Step 4: Inoculate the bacterial solution into 65 kg of fresh latex at 20°C and stir at 75 rpm for 5 minutes. Then, add calcium chloride solution and aqueous solution of sodium lauryl polyoxyethylene ether sulfate and sodium stearate and continue stirring for 15 minutes. Add formic acid to adjust the pH to 4.6.

[0072] Step 5: Let the mixture stand for fermentation and maturation for 3 days at an indoor temperature of 22°C;

[0073] Step 6: Pressing the fermented and matured rubber block into pieces, cutting the pieces into pieces, drying them at room temperature for 4 days, and drying them at 75° C. for 32 hours to obtain the high-performance natural rubber.

[0074] The inoculation amount of Lactobacillus paracasei CICC 20290 in fresh latex was 4.80×10 12 cfu / g fresh latex;

[0075] The amount of calcium chloride used is 0.08% of the dry glue mass;

[0076] The total mass of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 0.3% of the mass of the dry rubber; the mass ratio of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 3:1.

[0077] Natural Rubber 5:

[0078] The inoculation amount of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 in fresh latex was 4.80×10 12 cfu / g fresh latex; the number ratio of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC20290 was 1:0.5; the others were the same as those of natural rubber 1.

[0079] Natural rubber 6:

[0080] The inoculation amount of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 in fresh latex was 4.80×10 12 cfu / g fresh latex; the number ratio of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC20290 was 1:5.5; the others were the same as those of natural rubber 1.

[0081] Natural rubber 7:

[0082] The preparation method is as follows:

[0083] Step 1: get Hevea brasiliensis natural fresh latex (dry rubber content is 31.8wt%) 65kg standby;

[0084] Step 2: Prepare bacterial suspensions of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290;

[0085] Step 3: Prepare a 10% calcium chloride solution; prepare a 10% sodium lauryl polyoxyethylene ether sulfate aqueous solution;

[0086] Step 4: Inoculate the bacterial solution into 65 kg of fresh latex at 20°C and stir at 75 rpm for 5 minutes; then add calcium chloride solution and sodium lauryl polyoxyethylene ether sulfate aqueous solution and continue stirring for 15 minutes; add formic acid to adjust the pH to 4.6;

[0087] Step 5: Let the mixture stand for fermentation and maturation for 3 days at an indoor temperature of 22°C;

[0088] Step 6: Pressing the fermented and matured rubber block into pieces, cutting the pieces into pieces, drying them at room temperature for 4 days, and drying them at 75° C. for 32 hours to obtain the high-performance natural rubber.

[0089] Among them, the inoculation amount of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 in fresh latex was 4.80×10 12 cfu / g fresh latex; the number ratio of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 was 1:3;

[0090] The amount of calcium chloride used is 0.08% of the dry glue mass;

[0091] The mass of sodium lauryl polyoxyethylene ether sulfate is 0.3% of the mass of dry rubber.

[0092] Natural rubber 8:

[0093] The preparation method is as follows:

[0094] Step 1: get Hevea brasiliensis natural fresh latex (dry rubber content is 31.8wt%) 65kg standby;

[0095] Step 2: Prepare bacterial suspensions of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290;

[0096] Step 3: Prepare a 10% calcium chloride solution; prepare a 10% sodium stearate aqueous solution;

[0097] Step 4: Inoculate the bacterial solution into 65 kg of fresh latex at 20°C and stir at 75 rpm for 5 minutes. Then, add calcium chloride solution and sodium stearate aqueous solution and continue stirring for 15 minutes. Add formic acid to adjust the pH to 4.6.

[0098] Step 5: Let the mixture stand for fermentation and maturation for 3 days at an indoor temperature of 22°C;

[0099] Step 6: Pressing the fermented and matured rubber block into pieces, cutting the pieces into pieces, drying them at room temperature for 4 days, and drying them at 75° C. for 32 hours to obtain the high-performance natural rubber.

[0100] Among them, the inoculation amount of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 in fresh latex was 4.80×10 12 cfu / g fresh latex; the number ratio of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 was 1:3;

[0101] The amount of calcium chloride used is 0.08% of the dry glue mass;

[0102] The mass of sodium stearate is 0.3% of the mass of the dry rubber.

[0103] Natural rubber 9:

[0104] The total mass of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 0.3% of the dry rubber mass; the mass ratio of sodium lauryl polyoxyethylene ether sulfate to sodium stearate is 0.5:1; other parameters are the same as those of natural rubber 1.

[0105] Natural Rubber 10:

[0106] The total mass of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 0.3% of the dry rubber mass; the mass ratio of sodium lauryl polyoxyethylene ether sulfate to sodium stearate is 6:1; other parameters are the same as those of natural rubber 1.

[0107] Natural rubber 11:

[0108] The preparation method is as follows:

[0109] Step 1: get Hevea brasiliensis natural fresh latex (dry rubber content is 31.8wt%) 65kg standby;

[0110] Step 2: Prepare bacterial suspensions of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290;

[0111] Step 3: Prepare a 10% calcium chloride solution; prepare a 10% sodium lauryl sulfate aqueous solution;

[0112] Step 4: Inoculate the bacterial solution into 65 kg of fresh latex at 20°C and stir at 75 rpm for 5 minutes. Then, add calcium chloride solution and sodium lauryl sulfate aqueous solution and continue stirring for 15 minutes. Add formic acid to adjust the pH to 4.6.

[0113] Step 5: Let the mixture stand for fermentation and maturation for 3 days at an indoor temperature of 22°C;

[0114] Step 6: Pressing the fermented and matured rubber block into pieces, cutting the pieces into pieces, drying them at room temperature for 4 days, and drying them at 75° C. for 32 hours to obtain the high-performance natural rubber.

[0115] Among them, the inoculation amount of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 in fresh latex was 4.80×10 12 cfu / g fresh latex; the number ratio of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 was 1:3;

[0116] The amount of calcium chloride used is 0.08% of the mass of the dry glue; the mass of sodium lauryl sulfate is 0.3% of the mass of the dry glue.

[0117] Performance testing:

[0118] The strength and elongation properties of the natural rubbers 1 to 11 were tested as follows.

[0119] 1. Strength performance test

[0120] The tensile strength and tear strength of natural rubber 1-11 were tested using the test methods described in GB / T 528-2009 and GB / T 529-2008. The test results are shown in Table 1.

[0121] Table 1: Strength performance test

[0122]

[0123]

[0124] 2. Elongation performance test

[0125] The elongation at break of natural rubber 1-11 was tested using the test method described in GB / T528-2009. The test results are shown in Table 2.

[0126] Table 2: Elongation performance test

[0127] test Elongation at break Natural rubber 1 853.78％ Natural rubber 2 851.62％ Natural rubber 3 769.85％ Natural rubber 4 799.14％ Natural rubber 5 818.53％ Natural rubber 6 845.49％ Natural rubber 7 785.04％ Natural rubber 8 805.79％ Natural rubber 9 831.90％ Natural rubber 10 824.67％ Natural rubber 11 761.38％

[0128] The test results in Table 1-2 show that the natural rubber prepared in the present invention has excellent tensile strength and tear strength, and has a good elongation at break effect. The natural rubber prepared in the present invention has excellent performance and good application prospects.

[0129] The natural rubber prepared by the present invention has a tensile strength of 31.24 MPa, a tear strength of 35.38 MPa, and an elongation at break of 853.78%, and has good performance.

[0130] As shown in the test results of natural rubber 1 and 3-4 in Table 1-2, the specific fermentation bacteria of the present invention effectively improve the comprehensive performance of natural rubber. The combination of plant lactobacillus CICC 6009 and Lactobacillus paracasei CICC 20290 fermentation bacteria can synergistically improve the performance of natural rubber. The possible reason is that the combination of fermentation bacteria effectively reduces impurities in latex and gives rubber proteins and other effective ingredients more abundant. The acid produced by fermentation also affects the solidification of latex, thereby affecting the performance of rubber as a whole. When the plant lactobacillus CICC 6009 and Lactobacillus paracasei CICC 20290 quantity ratio in the system is 1:2-3.5, the effect is better, which can be seen in combination with the test results of natural rubber 1 and 5-6.

[0131] Comparison of natural rubbers 1, 7-10 shows that the specific sodium lauryl polyoxyethylene ether sulfate and sodium stearate used in the present invention can enhance the strength and elongation at break of rubber, giving the rubber a promising application prospect; particularly when the ratio of the two is 2-4:1, the effect is even better. Compared with other additives such as sodium lauryl sulfate, the use of sodium lauryl polyoxyethylene ether sulfate and sodium stearate in the present invention can further enhance the strength and elongation at break of rubber, giving the rubber better performance.

[0132] Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these modifications and variations.

Claims

1. Application of a combination of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 in a ratio of 1:2-3.5 in further improving the tensile strength, tear strength and elongation at break of high-performance natural rubber, characterized in that: The preparation method of high-performance natural rubber comprises the following steps: Step 1: Take fresh latex and set aside; Step 2: Prepare bacterial suspensions of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290; Step 3: Prepare calcium chloride solution; prepare sodium lauryl polyoxyethylene ether sulfate and sodium stearate aqueous solution; Step 4: Inoculate the bacterial solution into fresh latex at 15-20°C and stir evenly; then add calcium chloride solution and sodium lauryl polyoxyethylene ether sulfate and sodium stearate aqueous solution and stir evenly; adjust the pH; Step 5: Let it stand for fermentation and maturation; Step 6: Pressing, cutting, air-drying, and drying the fermented and matured rubber block to obtain the high-performance natural rubber; The inoculum size of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 in fresh latex was 3.2×10 12 -6.5×10 12 cfu / g fresh latex; the mass ratio of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 2-4:

1.

2. The use of a combination of sodium lauryl polyoxyethylene ether sulfate and sodium stearate in a mass ratio of 2-4:1 to further improve the tensile strength, tear strength and elongation at break of high-performance natural rubber, characterized in that: The preparation method of high-performance natural rubber comprises the following steps: Step 1: Take fresh latex and set aside; Step 2: Prepare bacterial suspensions of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290; Step 3: Prepare calcium chloride solution; prepare sodium lauryl polyoxyethylene ether sulfate and sodium stearate aqueous solution; Step 4: Inoculate the bacterial solution into fresh latex at 15-20°C and stir evenly; then add calcium chloride solution and sodium lauryl polyoxyethylene ether sulfate and sodium stearate aqueous solution and stir evenly; adjust the pH; Step 5: Let it stand for fermentation and maturation; Step 6: Pressing, cutting, air-drying, and drying the fermented and matured rubber block to obtain the high-performance natural rubber; The inoculum size of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 in fresh latex was 3.2×10 12 -6.5×10 12 cfu / g fresh latex; the number ratio of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC20290 was 1:2-3.

5.

3. The use according to claim 1 or 2, characterized in that The amount of calcium chloride used is 0.05-0.3% of the dry rubber mass.

4. The use according to claim 1 or 2, characterized in that The dry rubber content in the fresh latex is 15-45 wt %; and the pH is adjusted to 4-5.

5. The use according to claim 1 or 2, characterized in that: The total mass of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 0.2-0.6% of the mass of the dry rubber.

6. The use according to claim 1 or 2, characterized in that The fermentation and maturation time is more than 8 hours.

7. The use according to claim 1 or 2, characterized in that The sheets are dried at room temperature for 2-7 days; the drying temperature is 70-90°C and the drying time is 20-38 hours.

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