High-performance natural rubber and preparation method thereof

Abstract

The invention relates to the technical field of rubber, in particular to high-performance natural rubber and a preparation method thereof. Specific strains of plant lactobacillus plantarum CICC 6009 and casei casei CICC 20290 are matched, functional raw materials of calcium chloride, lauryl alcohol polyoxyethylene ether sodium sulfate and sodium stearate are added, the pH value is adjusted, and then the natural rubber is prepared through fermentation curing, crepe pressing, piece cutting, piece airing and drying. The natural rubber prepared by the invention has excellent tensile strength and tear strength, has a better elongation at break effect, has excellent physical and mechanical properties, and has a good application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of rubber, and 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, and its molecular formula is (C5H8)n. Its rubber hydrocarbon (cis-1, 4-polyisoprene) content is more than 90%, and it also contains a small amount of protein, fatty acid, sugar and ash impurities.

[0003] Natural rubber has a series of excellent physical properties, such as good resilience, insulation, tear resistance, plasticity, etc., and is widely used in many fields. Although NR has certain characteristics, its impurities and other defects lead to insufficient strength and elongation performance, which still cannot meet the use requirements, resulting in limited 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 the high-performance natural rubber of the present invention comprises the following steps:

[0006] Step 1: Take fresh latex for later use;

[0007] Step 2: preparing bacterial liquids 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: At 15-20°C, inoculate the bacterial solution into fresh latex 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: Standing for fermentation and maturation;

[0011] Step 6: Pressing, cutting, airing and drying the fermented and matured rubber block 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 natural fresh latex of Hevea brasiliensis.

[0013] Furthermore, the concentrations of the bacterial solutions of Lactobacillus 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] Further, 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, etc.

[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 can be 0.05-0.3%, 0.06%, 0.08%, 0.1%, 0.2%, 0.3%, etc. of the mass of the dry rubber.

[0017] Furthermore, the concentration of sodium lauryl polyoxyethylene ether sulfate and sodium stearate solution can be adjusted according to actual needs to ensure the concentration of sodium lauryl polyoxyethylene ether sulfate and sodium stearate in the latex. The total mass of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 0.2-0.6%, 0.3%, 0.4%, 0.5%, 0.6% of the dry rubber mass, etc.

[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 more than 8 hours. The fermentation time cannot be too long, as it will affect the yield and rubber properties. The fermentation time cannot be more than 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 standing fermentation can be above 15°C; the ambient temperature cannot be too high, as too high a temperature affects the fermentation effect and cost, and it is preferably selected to be below 35°C. For example, the ambient temperature during standing 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 strains of lactobacillus plantarum CICC 6009 and lactobacillus paracasei CICC 20290, adds functional raw materials of calcium chloride, sodium lauryl polyoxyethylene ether sulfate and sodium stearate, adjusts pH, and then carries out fermentation and aging, creping, sheet cutting, sheet drying and drying to prepare natural rubber.

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

[0027] The natural rubber prepared by the 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 fermentation bacteria of the present invention effectively improve the comprehensive performance of natural rubber, and the combination of plant lactobacillus CICC 6009 and Lactobacillus paracasei CICC 20290 fermentation bacteria can synergistically improve the performance of natural rubber. The combination of the two fermentation bacteria can effectively reduce impurities in latex and give rubber protein and other effective ingredients more abundant, and the acid produced by fermentation can also affect the solidification of latex, thereby affecting the performance of rubber as a whole. When the ratio of plant lactobacillus CICC 6009 and Lactobacillus paracasei CICC 20290 in the system is 1:2-3.5, the effect is better.

[0029] The present invention adopts sodium lauryl alcohol polyoxyethylene ether sulfate and sodium stearate to enhance the strength and elongation at break of rubber, and endows the rubber with better application prospects; in particular, when the ratio of the two is 2-4:1, the effect produced is better. Compared with other additives such as sodium dodecyl sulfate, the present invention adopts sodium lauryl alcohol polyoxyethylene ether sulfate and sodium stearate to enhance the strength and elongation at break of rubber, and endow the rubber with better use effect.

[0030] The natural rubber prepared by the 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 Microbiological Culture Collection Administration Center.

[0033] Natural Rubber 1:

[0034] The preparation method is as follows:

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

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

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

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

[0039] Step 5: The indoor ambient temperature is 22°C and the mixture is allowed to ferment and mature for 3 days;

[0040] Step 6: The fermented and matured rubber block is creped, cut into pieces, air-dried at room temperature for 4 days, and dried 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 alcohol polyoxyethylene ether sulfate and sodium stearate is 0.3% of the mass of the dry rubber; the mass ratio of sodium lauryl alcohol polyoxyethylene ether sulfate and sodium stearate is 3:1.

[0044] Natural Rubber 2:

[0045] The preparation method is as follows:

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

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

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

[0049] Step 4: At 20°C, inoculate the bacterial solution into 50 kg of fresh latex and stir at 80 rpm for 4 minutes; then add calcium chloride solution and sodium lauryl polyoxyethylene ether sulfate and sodium stearate aqueous solution 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 mixture is allowed to ferment and mature for 3.5 days;

[0051] Step 6: The fermented and matured rubber block is creped, cut into pieces, air-dried at room temperature for 5 days, and dried 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: take 65kg of natural fresh latex (dry rubber content is 31.8wt%) from Hevea brasiliensis for standby use;

[0058] Step 2: preparing a bacterial solution of Lactobacillus plantarum CICC 6009;

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

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

[0061] Step 5: The indoor ambient temperature is 22°C and the mixture is allowed to ferment and mature for 3 days;

[0062] Step 6: The fermented and matured rubber block is creped, cut into pieces, air-dried at room temperature for 4 days, and dried at 75° C. for 32 hours to obtain the high-performance natural rubber.

[0063] Among them, the inoculation amount of 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 alcohol polyoxyethylene ether sulfate and sodium stearate is 0.3% of the mass of the dry rubber; the mass ratio of sodium lauryl alcohol polyoxyethylene ether sulfate and sodium stearate is 3:1.

[0066] Natural Rubber 4:

[0067] The preparation method is as follows:

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

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

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

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

[0072] Step 5: The indoor ambient temperature is 22°C and the mixture is allowed to ferment and mature for 3 days;

[0073] Step 6: The fermented and matured rubber block is creped, cut into pieces, air-dried at room temperature for 4 days, and dried at 75° C. for 32 hours to obtain the high-performance natural rubber.

[0074] The inoculation amount of Lactobacillus casei 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 alcohol polyoxyethylene ether sulfate and sodium stearate is 0.3% of the mass of the dry rubber; the mass ratio of sodium lauryl alcohol 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: take 65kg of natural fresh latex (dry rubber content is 31.8wt%) from Hevea brasiliensis for standby use;

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

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

[0086] Step 4: At 20°C, inoculate the bacterial solution into 65 kg of fresh latex 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: The indoor ambient temperature is 22°C and the mixture is allowed to ferment and mature for 3 days;

[0088] Step 6: The fermented and matured rubber block is creped, cut into pieces, air-dried at room temperature for 4 days, and dried 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: take 65kg of natural fresh latex (dry rubber content is 31.8wt%) from Hevea brasiliensis for standby use;

[0095] Step 2: preparing bacterial liquids 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: At 20°C, inoculate the bacterial solution into 65 kg of fresh latex 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: The indoor ambient temperature is 22°C and the mixture is allowed to ferment and mature for 3 days;

[0099] Step 6: The fermented and matured rubber block is creped, cut into pieces, air-dried at room temperature for 4 days, and dried 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 dry rubber.

[0103] Natural Rubber 9:

[0104] 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 0.5:1; the rest 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 mass of the dry rubber; the mass ratio of sodium lauryl polyoxyethylene ether sulfate and sodium stearate is 6:1; the others are the same as those of natural rubber 1.

[0107] Natural Rubber 11:

[0108] The preparation method is as follows:

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

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

[0111] Step 3: prepare a calcium chloride solution with a mass concentration of 10%; prepare an aqueous solution with a mass concentration of 10% sodium dodecyl sulfate;

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

[0113] Step 5: The indoor ambient temperature is 22°C and the mixture is allowed to ferment and mature for 3 days;

[0114] Step 6: The fermented and matured rubber block is creped, cut into pieces, air-dried at room temperature for 4 days, and dried 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 dodecyl sulfate is 0.3% of the mass of the dry glue.

[0117] Performance Testing:

[0118] The strength and elongation performance tests were performed on the natural rubbers 1 to 11. The specific test contents are as follows.

[0119] 1. Strength performance test

[0120] The tensile strength and tear strength of natural rubber 1-11 were tested. The test methods were based on the contents of 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. The test method was based on the content recorded 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] It can be seen from the test results in Table 1-2 that the natural rubber prepared by the present invention has excellent tensile strength and tear strength, and has a good elongation at break effect. The natural rubber prepared by the present invention has excellent performance and good application prospects.

[0129] The natural rubber prepared by the 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] It can be seen from the test results of natural rubber 1, 3-4 in Table 1-2 that the specific fermentation bacteria of the present invention effectively improve the comprehensive performance of natural rubber, and the combination of plant lactobacillus CICC 6009 and lactobacillus casei 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 protein and other effective ingredients more abundant, and 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 casei CICC 20290 quantity ratio in the system is 1:2-3.5, the effect is better, and the content can be combined with the test results of natural rubber 1, 5-6.

[0131] By comparing natural rubber 1, 7-10, it can be seen 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 better application prospect; especially when the ratio of the two is 2-4:1, the effect produced is better. Compared with other additives such as sodium dodecyl sulfate, the sodium lauryl polyoxyethylene ether sulfate and sodium stearate used in the present invention can further enhance the strength and elongation at break of rubber, giving the rubber a better use effect.

[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 also intended to include these modifications and variations.

Claims

1. A method for preparing high-performance natural rubber, characterized in that: The steps include: Step 1: Take fresh latex for later use; Step 2: preparing bacterial liquids 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: At 15-20°C, inoculate the bacterial solution into fresh latex 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: Standing for fermentation and maturation; Step 6: Pressing, cutting, airing and drying the fermented and matured rubber block to obtain the high-performance natural rubber.

2. The preparation method according to claim 1, characterized in that: 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.

3. The preparation method according to claim 1, characterized in that: The quantitative ratio of Lactobacillus plantarum CICC 6009 and Lactobacillus paracasei CICC 20290 was 1:2-3.

5.

4. The preparation method according to claim 1, characterized in that: The amount of calcium chloride used is 0.05-0.3% of the dry glue mass.

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

6. The preparation method according to claim 1, 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.

7. The preparation method according to claim 1, characterized in that: The mass ratio of sodium lauryl polyoxyethylene ether sulfate to sodium stearate is 2-4:

1.

8. The preparation method according to claim 1, characterized in that: The fermentation and aging time is more than 8 hours.

9. The preparation method according to claim 1, characterized in that: The drying process is carried out at room temperature for 2-7 days; the drying temperature is 70-90°C and the drying time is 20-38 hours.

10. A high-performance natural rubber prepared according to the preparation method according to any one of claims 1 to 9.

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