High P0 and PRI natural rubber and preparation method thereof

Abstract

The invention relates to the field of new materials, and particularly discloses high P0 and PRI natural rubber and a preparation method thereof. The natural rubber comprises the following raw materials in parts by weight: 80 parts of natural rubber; 20 parts of butyl rubber; 1-2 parts of a silane coupling agent; 1-2 parts of lauryl sodium sulfate; 3-5 parts of a preservative; 7-9 parts of a curing agent; 4-6 parts of acrylate grafted modified tea seed cake powder; 3 to 5 parts of biochanin A; the natural rubber is dry glue in natural latex, and the natural latex is the natural latex with the dry glue content of 25 wt% after non-glue components are centrifugally separated from fresh forest latex; the butyl rubber is derived from butyl latex having a solid content of 50 wt%. The preparation method comprises the following steps: preparing raw materials; performing mixing; performing curing; and post-processing. The natural rubber provided by the invention has high plasticity initial value and plasticity retention rate, and excellent processability.

Description

Technical Field

[0001] The present application relates to the field of new materials, and more specifically, to a natural rubber with high P0 and PRI and a preparation method thereof. Background Art

[0002] With the widespread application of rubber products, the natural rubber industry, as a raw material, is developing faster and faster. Due to quality reasons, my country imports a large amount of natural rubber, while domestic natural rubber has some specific shortcomings in quality and application, which affects their performance in some high-end application products.

[0003] Domestic natural rubber often contains more non-rubber components (such as protein, fatty acids, ash, etc.), which may lead to lower purity of the rubber. In particular, if these non-rubber components cannot be completely removed, it will easily cause changes in the initial plasticity and plasticity retention rate of the natural rubber, resulting in low heat and oxidation resistance, thereby affecting the processability and product performance of rubber products. Summary of the invention

[0004] In order to improve the initial plasticity value and plasticity retention rate of natural rubber, thereby improving the processability of natural rubber, the present application provides a natural rubber with high P0 and PRI and a preparation method thereof.

[0005] In the first aspect, the present application provides a natural rubber with high P0 and PRI, using the following technical solution:

[0006] A natural rubber with high P0 and PRI, comprising the following raw materials in parts by weight:

[0007] 80 parts of natural rubber;

[0008] Butyl rubber 20 parts;

[0009] 1-2 parts of silane coupling agent;

[0010] 1-2 parts of sodium lauryl sulfate;

[0011] 3 to 5 parts of preservative;

[0012] 7-9 parts of curing agent;

[0013] 4-6 parts of acrylate grafted modified tea kud powder;

[0014] 3-5 parts of chickpea sprouts A;

[0015] The natural rubber is dry rubber in natural latex, and the natural latex is fresh forest latex obtained by centrifugation to separate non-rubber components, and the dry rubber content is 25wt%;

[0016] The butyl rubber is derived from butyl latex with a solid content of 50 wt%.

[0017] By adopting the above technical scheme, due to the combination of butyl rubber and natural rubber, and the assistance of acrylate grafted modified tea bud powder and chickpea sprout A, butyl rubber can effectively improve the heat oxidation resistance of natural rubber, acrylate grafted modified tea bud powder can improve the compatibility of the cross-linking system, make the butyl rubber and natural rubber more closely combined, and can improve the dispersibility and fluidity of each raw material, and improve the processing performance of natural rubber; at the same time, chickpea sprout A can be effectively combined into the cross-linking system, play a lubricating role between rubber molecular chains, and increase its softness and plasticity without changing the chemical structure of the cross-linking system, so as to obtain the effect of improving the initial plasticity value and plasticity retention rate of natural rubber, thereby improving the processing performance of natural rubber.

[0018] Optionally, each portion of the preservative comprises the following raw materials in parts by weight: 3-5 parts of nano titanium dioxide, 5-8 parts of ethyl paraben, 38-45 parts of chitosan, 45-55 parts of lysozyme, and 3-5 parts of sodium metabisulfite.

[0019] Optionally, each portion of the curing agent comprises the following raw materials in parts by weight: 60 to 81 parts of extract, 5 to 7.5 parts of sodium bisulfate, and 10 to 15 parts of palmitic acid.

[0020] Optionally, the extract is a mixture of extracts of Yamanashi, Rhizoma Aucklandiae and Vitis vinifera, and the weight ratio of the Yamanashi extract, Rhizoma Aucklandiae extract and Vitis vinifera extract is 1:1:1.

[0021] Optionally, the preparation method of acrylate grafted modified tea kud powder is:

[0022] Mixing: Take tea dross powder and add it into anhydrous ethanol to completely disperse it evenly, then drop butyl acrylate and stir until it is evenly mixed, then add azobisisobutyronitrile and stir until it is evenly mixed to form a reaction mixture; the weight ratio of tea dross powder, butyl acrylate, azobisisobutyronitrile and anhydrous ethanol is 100:200:3:1000;

[0023] Reaction: Place the reaction mixture in a 70°C oil bath and stir the reaction at constant temperature for 4 hours in an oxygen-free environment to allow the reaction to proceed fully;

[0024] Post-treatment: After the reaction is completed, stop heating and cool to room temperature, filter to obtain a crude product, wash the crude product to remove residual impurities, and vacuum dry to obtain acrylate grafted modified tea kud powder.

[0025] Optionally, the natural rubber further comprises the following raw materials in parts by weight:

[0026] 3-5 parts of chopped acetate fiber;

[0027] 3 to 5 parts of PLGA-chitosan composite microspheres.

[0028] By adopting the above technical solution, short-cut acetate fibers are adsorbed on the surface of PLGA-chitosan composite microspheres, which can act as a bridge to effectively combine PLGA-chitosan composite microspheres with rubber molecular chains. PLGA-chitosan composite microspheres can participate in and form a three-dimensional network structure of the material in the cross-linking system, improve the elasticity and strength of natural rubber, and due to its rich amino functional groups, can interact with rubber molecular chains to improve interfacial adhesion and further improve the plasticity of natural rubber. In addition, short-cut acetate fibers are combined with acrylate-grafted modified tea pudding powder to further improve the dispersibility of acrylate-grafted modified tea pudding powder in the rubber system.

[0029] In the second aspect, the present application provides a method for preparing natural rubber with high PO and PRI, using the following technical solution:

[0030] A method for preparing natural rubber with high PO and PRI comprises the following steps:

[0031] (1) Raw material preparation:

[0032] Latex blending: take natural latex and butyl latex, adjust the pH to neutral respectively, add silane coupling agent to butyl latex for surface treatment, mix until uniform, then add the treated butyl latex to natural latex, stir and homogenize while adding, make the two latexes fully mixed, then add sodium dodecyl sulfate, mix evenly, filter, vacuum defoam, and obtain latex mixture;

[0033] Preparation of the preservative: taking the raw materials of the preservative according to the ratio, mixing and stirring evenly to prepare the preservative, and diluting with deionized water to prepare a 10% aqueous solution of the preservative;

[0034] Preparation of curing agent: Mix and stir the raw materials of curing agent according to the ratio to obtain curing agent, and dilute with deionized water to obtain a 10% aqueous solution of curing agent;

[0035] Preparation of acrylate grafted modified tea kud powder;

[0036] (2) Mixing:

[0037] Add 10% aqueous solution of preservative to the latex mixture according to the ratio, and stir evenly; then add acrylate grafted modified tea kud powder and chickpea sprout A according to the ratio, and stir evenly;

[0038] (3) Curing:

[0039] Add 10% aqueous solution of curing agent to the latex mixture according to the ratio, stir mechanically at room temperature to disperse evenly, and flocculate the latex evenly for 10 to 16 hours to obtain a coagulated rubber material;

[0040] (4) Post-processing:

[0041] The coagulated rubber is sequentially creped, granulated and dried at a temperature of 55 to 60°C for a drying time of 24 to 36 hours to obtain natural rubber.

[0042] By adopting the above technical solution and the above preparation process, the obtained natural rubber has better plasticity and processability.

[0043] In a third aspect, the present application provides a method for preparing natural rubber with high PO and PRI, using the following technical solution:

[0044] A method for preparing natural rubber with high PO and PRI comprises the following steps:

[0045] (1) Raw material preparation:

[0046] Latex blending: take natural latex and butyl latex, adjust the pH to neutral respectively, add silane coupling agent to butyl latex for surface treatment, mix until uniform, then add the treated butyl latex to natural latex, stir and homogenize while adding, make the two latexes fully mixed, then add sodium dodecyl sulfate, mix evenly, filter, vacuum defoam, and obtain latex mixture;

[0047] Preparation of the preservative: taking the raw materials of the preservative according to the ratio, mixing and stirring evenly to prepare the preservative, and diluting with deionized water to prepare a 10% aqueous solution of the preservative;

[0048] Preparation of curing agent: Mix and stir the raw materials of curing agent according to the ratio to obtain curing agent, and dilute with deionized water to obtain a 10% aqueous solution of curing agent;

[0049] Preparation of acrylate grafted modified tea kud powder;

[0050] (2) Mixing:

[0051] Add 10% aqueous solution of preservative to the latex mixture according to the proportion, and stir evenly; then add acrylate grafted modified tea kudzu powder, biochanin A, chopped cellulose acetate and PLGA-chitosan composite microspheres according to the proportion, and stir evenly;

[0052] (3) Curing:

[0053] Add 10% aqueous solution of curing agent to the latex mixture according to the ratio, stir mechanically at room temperature to disperse evenly, and flocculate the latex evenly for 10 to 16 hours to obtain a coagulated rubber material;

[0054] (4) Post-processing:

[0055] The coagulated rubber is sequentially creped, granulated and dried at a temperature of 55 to 60°C for a drying time of 24 to 36 hours to obtain natural rubber.

[0056] In summary, this application has the following beneficial effects:

[0057] 1. Since the present application adopts butyl rubber and natural rubber, and is assisted by acrylate grafted modified tea kudzu powder and chickpea sprout A, the three are compounded to effectively improve the compatibility of the cross-linking system, enhance the softness and plasticity of the molecular chain, and obtain the effect of improving the initial plasticity value and plasticity retention rate of natural rubber, thereby improving the processability of natural rubber.

[0058] 2. In the present application, short-cut acetate fibers are preferably compounded with PLGA-chitosan composite microspheres, which can interact with rubber molecular chains, improve interfacial adhesion, and further improve the plasticity of natural rubber.

[0059] 3. The natural rubber prepared by the method of the present application has excellent plasticity and processability. DETAILED DESCRIPTION

[0060] The present application is further described in detail with reference to the following examples. It is specially noted that if no specific conditions are specified in the following examples, the conventional conditions or the conditions recommended by the manufacturer are followed, and the raw materials used in the following examples can be obtained from common commercial sources unless otherwise specified.

[0061] The silane coupling agent is Si-69.

[0062] Tea tree bud powder, brand Vanilla Bio.

[0063] Chickpea sprout extract A, brand Kmik, first-class product.

[0064] Nano titanium dioxide, anatase type, brand Master.

[0065] Ethylparaben, food grade, brand: Final Peak Bio.

[0066] Chitosan, CAS No. 9012-76-4.

[0067] Lysozyme, CAS No. 12650-88-3.

[0068] Sodium metabisulfite, analytical grade, CAS No. 7681-57-4.

[0069] Palmitic acid, CAS No. 57-10-3.

[0070] Butyl acrylate, CAS No. 141-32-2, superior grade.

[0071] Chopped acetate fiber, triacetate, length 1mm.

[0072] PLGA-chitosan composite microspheres were purchased from Xi'an Qiyue Biotechnology Co., Ltd.

[0073] Example

[0074] Example 1

[0075] A natural rubber with high P0 and PRI, comprising the following raw materials:

[0076] 80kg of natural rubber, which is the dry rubber in natural latex. The natural latex is fresh forest latex, which is centrifuged to separate the non-rubber components, and the dry rubber content is 25wt% of natural latex. The amount of natural latex used is 320kg. 20kg of butyl rubber, which is derived from butyl latex with a solid content of 50wt%, and the amount of butyl latex used is 40kg. 1kg of silane coupling agent. 1kg of sodium lauryl sulfate. 3kg of preservative. 7kg of curing agent. 4kg of acrylate-grafted tea dregs powder. 3kg of chickpea sprout A.

[0077] A method for preparing natural rubber with high PO and PRI comprises the following steps:

[0078] (1) Raw material preparation:

[0079] Latex blending: Take natural latex and butyl latex, adjust the pH of each to neutral, add silane coupling agent to butyl latex for surface treatment, mix until uniform, then add the treated butyl latex to natural latex, stir while adding, homogenize at 600 rpm for 30 minutes to fully mix the two latexes, then add sodium dodecyl sulfate, mix evenly, filter, and vacuum defoam to obtain a latex mixture for use.

[0080] Preparation of preservative: The preservative includes the following raw materials: 3kg of nano titanium dioxide, 5kg of ethyl paraben, 38kg of chitosan, 45kg of lysozyme, and 3kg of sodium metabisulfite. The raw materials of the preservative are mixed and stirred evenly according to the proportion to prepare the preservative, and then diluted with deionized water to prepare a 10% aqueous solution of the preservative.

[0081] Preparation of curing agent: The curing agent includes the following raw materials: 60 kg of extract, which is a mixture of sorbitan, shanlihong and wild grape extracts, and the ratio of sorbitan extract, shanlihong extract and wild grape extract is 1:1:1; 7.5 kg of sodium bisulfate, 10 kg of palmitic acid. According to the ratio, the raw materials of the curing agent are mixed and stirred evenly to obtain the curing agent, and deionized water is added to dilute it to obtain a 10% aqueous solution of the curing agent.

[0082] Preparation of acrylate grafted modified tea kud powder:

[0083] Pretreatment: screen, clean, dry at 60℃ for 24h, and sieve through 80 mesh.

[0084] Mixing: Take 10 kg of tea dross powder and add it into anhydrous ethanol to completely disperse it evenly, then add butyl acrylate dropwise, stir until it is evenly mixed, then add azobisisobutyronitrile, stir until it is evenly mixed to form a reaction mixture; the ratio of tea dross powder, butyl acrylate, azobisisobutyronitrile and anhydrous ethanol is 100:200:3:1000.

[0085] Reaction: Place the reaction mixture in a 70°C oil bath, turn on nitrogen protection, and stir the reaction at constant temperature for 4 hours in an oxygen-free environment to allow the reaction to proceed fully.

[0086] Post-treatment: After the reaction is completed, stop heating and cool to room temperature, filter to obtain a crude product, wash the crude product with anhydrous ethanol to remove residual impurities, and vacuum dry at 60° C. for 24 hours to obtain acrylate-grafted modified tea kud powder.

[0087] (2) Mixing:

[0088] Add 10% aqueous solution of preservative to the latex mixture according to the proportion, and stir evenly; then add acrylate grafted modified tea kud powder and chickpea sprout A according to the proportion, and stir evenly.

[0089] (3) Curing:

[0090] Add 10% aqueous solution of curing agent to the latex mixture according to the ratio, disperse evenly by mechanical stirring at room temperature, and flocculate the latex evenly for 10 hours to obtain a coagulated rubber material.

[0091] (4) Post-processing:

[0092] The coagulated rubber material was creped, granulated and dried in sequence, with a particle size of 3 mm, a drying temperature of 55°C and a drying time of 36 h to obtain natural rubber.

[0093] Example 2

[0094] A natural rubber with high PO and PRI, which is different from Example 1 in that the amounts of various raw materials are different, see Table 1 for details.

[0095] A method for preparing natural rubber with high PO and PRI comprises the following steps:

[0096] (1) Raw material preparation:

[0097] Latex blending: Same as Example 1.

[0098] Preparation of preservative: The preservative includes the following raw materials: 4 kg of nano titanium dioxide, 6 kg of ethyl paraben, 42 kg of chitosan, 50 kg of lysozyme, and 4 kg of sodium metabisulfite. The raw materials of the preservative are mixed and stirred evenly according to the proportion to prepare the preservative, and then diluted with deionized water to prepare a 10% aqueous solution of the preservative.

[0099] Preparation of curing agent: The curing agent includes the following raw materials: 70 kg of extract, which is a mixture of sorbitan, shanlihong and wild grape extracts, and the ratio of sorbitan extract, shanlihong extract and wild grape extract is 1:1:1; 6 kg of sodium bisulfate, 12 kg of palmitic acid. According to the ratio, the raw materials of the curing agent are mixed and stirred evenly to obtain the curing agent, and deionized water is added to dilute it to obtain a 10% aqueous solution of the curing agent.

[0100] Preparation of acrylate grafted modified tea kud powder:

[0101] The preparation method is the same as that of Example 1.

[0102] (2) Mixing:

[0103] Add 10% aqueous solution of preservative to the latex mixture according to the proportion, and stir evenly; then add acrylate grafted modified tea kud powder and chickpea sprout A according to the proportion, and stir evenly.

[0104] (3) Curing:

[0105] Add 10% aqueous solution of curing agent to the latex mixture according to the ratio, disperse evenly with mechanical stirring at room temperature, and flocculate the latex evenly for 13 hours to obtain a coagulated rubber material.

[0106] (4) Post-processing:

[0107] The coagulated rubber is creped, granulated and dried in sequence, with a particle size of 3 mm, a drying temperature of 58°C and a drying time of 30 h to obtain natural rubber.

[0108] Example 3

[0109] A natural rubber with high PO and PRI, which is different from Example 1 in that the amounts of various raw materials are different, see Table 1 for details.

[0110] A method for preparing natural rubber with high PO and PRI comprises the following steps:

[0111] (1) Raw material preparation:

[0112] Latex blending: Same as Example 1.

[0113] Preparation of preservative: The preservative includes the following raw materials: 5kg of nano titanium dioxide, 8kg of ethyl paraben, 45kg of chitosan, 55kg of lysozyme, and 5kg of sodium metabisulfite. The raw materials of the preservative are mixed and stirred evenly according to the proportion to prepare the preservative, and then diluted with deionized water to prepare a 10% aqueous solution of the preservative.

[0114] Preparation of curing agent: The curing agent includes the following raw materials: 81 kg of extract, which is a mixture of sorbitan, shanlihong and wild grape extracts, and the ratio of sorbitan extract, shanlihong extract and wild grape extract is 1:1:1; 5 kg of sodium bisulfate, 15 kg of palmitic acid. According to the ratio, the raw materials of the curing agent are mixed and stirred evenly to obtain the curing agent, and deionized water is added to dilute it to obtain a 10% aqueous solution of the curing agent.

[0115] Preparation of acrylate grafted modified tea kud powder:

[0116] The preparation method is the same as Example 1.

[0117] (2) Mixing:

[0118] Add 10% aqueous solution of preservative to the latex mixture according to the proportion, and stir evenly; then add acrylate grafted modified tea kud powder and chickpea sprout A according to the proportion, and stir evenly.

[0119] (3) Curing:

[0120] Add 10% aqueous solution of curing agent into the latex mixture according to the ratio, disperse evenly by mechanical stirring at room temperature, and flocculate the latex evenly for 16 hours to obtain a coagulated rubber material.

[0121] (4) Post-processing:

[0122] The coagulated rubber is creped, granulated and dried in sequence, with a particle size of 3 mm, a drying temperature of 60°C and a drying time of 24 h to obtain natural rubber.

[0123] Example 4

[0124] A natural rubber with high PO and PRI, which is different from Example 2 in that the natural rubber also includes the following raw materials:

[0125] 3kg of chopped acetate fiber;

[0126] PLGA-chitosan composite microspheres 3kg.

[0127] A method for preparing natural rubber with high PO and PRI, which differs from Example 1 in that:

[0128] (2) Mixing: adding a 10% aqueous solution of a preservative to the latex mixture according to a ratio, and stirring evenly; adding acrylate grafted modified tea kudzu powder, biochanin A, chopped acetate fiber and PLGA-chitosan composite microspheres according to a ratio, and stirring evenly.

[0129] Example 5

[0130] A natural rubber with high PO and PRI, which is different from Example 2 in that the natural rubber also includes the following raw materials:

[0131] 4kg of chopped acetate fiber;

[0132] PLGA-chitosan composite microspheres 4kg.

[0133] A method for preparing natural rubber with high PO and PRI, which differs from Example 1 in that:

[0134] (2) Mixing: adding a 10% aqueous solution of a preservative to the latex mixture according to a ratio, and stirring evenly; adding acrylate grafted modified tea kudzu powder, biochanin A, chopped acetate fiber and PLGA-chitosan composite microspheres according to a ratio, and stirring evenly.

[0135] Example 6

[0136] A natural rubber with high PO and PRI, which is different from Example 2 in that the natural rubber also includes the following raw materials:

[0137] 5kg of chopped acetate fiber;

[0138] PLGA-chitosan composite microspheres 5kg.

[0139] A method for preparing natural rubber with high PO and PRI, which differs from Example 1 in that:

[0140] (2) Mixing: adding a 10% aqueous solution of a preservative to the latex mixture according to a ratio, and stirring evenly; adding acrylate grafted modified tea kudzu powder, biochanin A, chopped acetate fiber and PLGA-chitosan composite microspheres according to a ratio, and stirring evenly.

[0141] Example 7

[0142] The difference between this embodiment and embodiment 5 is that the natural rubber in this embodiment does not contain PLGA-chitosan composite microspheres.

[0143] Example 8

[0144] The difference between this embodiment and embodiment 5 is that there is no chopped acetate fiber in the natural rubber of this embodiment.

[0145] Comparative Example

[0146] Comparative Example 1

[0147] The difference between this comparative example and Example 2 is that natural rubber is used to replace all butyl rubber in the raw materials, and there is no acrylate-grafted modified tea kud powder and biochanin A.

[0148] Comparative Example 2

[0149] The difference between this comparative example and Example 2 is that natural rubber is used to replace all butyl rubber in the raw materials.

[0150] Comparative Example 3

[0151] The difference between this comparative example and Example 2 is that there is no acrylate grafted modified tea kud powder in the raw materials.

[0152] Comparative Example 4

[0153] The difference between this comparative example and Example 2 is that there is no biochanin A in the raw materials.

[0154] Comparative Example 5

[0155] The difference between this comparative example and Example 2 is that natural rubber is used to replace all butyl rubber in the raw materials, and there is no acrylate grafted modified tea kudzu powder.

[0156] Comparative Example 6

[0157] The difference between this comparative example and Example 2 is that natural rubber is used to replace all butyl rubber in the raw materials, and biochanin A is absent.

[0158] Comparative Example 7

[0159] The difference between this comparative example and Example 2 is that the raw materials do not contain acrylate-grafted modified tea kud powder and biochanin A.

[0160] Table 1 Amount of raw materials used in each embodiment and comparative example

[0161]

[0162] Performance testing

[0163] Detection Methods

[0164] Referring to "GB / T 3517-2014 Determination of Plasticity Retention Rate (PRI) of Natural Rubber", the natural rubber prepared in each embodiment and comparative example was sampled and tested, and the initial plasticity value P0 and the plasticity retention rate PRI were measured. Three groups of samples were tested for each embodiment or comparative example and the median value was taken. The test results are detailed in Table 2.

[0165] Table 2 Test results of various embodiments and comparative examples

[0166] Initial plasticity value P0 Plasticity retention rate PRI Example 1 45 78 Example 2 47 80 Example 3 46 79 Example 4 52 83 Example 5 55 85 Example 6 53 84 Example 7 47 78 Example 8 48 79 Comparative Example 1 35 65 Comparative Example 2 39 72 Comparative Example 3 40 73 Comparative Example 4 40 73 Comparative Example 5 36 67 Comparative Example 6 36 68 Comparative Example 7 37 69

[0167] Combining Example 2 and Comparative Example 1 with Table 2, it can be seen that the natural rubber of the present application adopts butyl rubber and natural rubber, and is assisted by acrylate grafted modified tea kud powder and chickpea sprout A. Butyl rubber can effectively improve the heat oxidation resistance of natural rubber, and acrylate grafted modified tea kud powder can improve the compatibility of the cross-linking system, so that butyl rubber and natural rubber are more closely combined, and the dispersibility and fluidity of each raw material can be improved, and the processing performance of natural rubber can be improved; at the same time, chickpea sprout A can be effectively combined into the cross-linking system, play a lubricating role between rubber molecular chains, and increase its softness and plasticity without changing the chemical structure of the cross-linking system. Therefore, the initial plasticity value and plasticity retention rate of natural rubber are improved, thereby improving the processability of natural rubber.

[0168] Combining Example 2 and Comparative Examples 1 to 7 and Table 2, it can be seen that when butyl rubber is used in combination with acrylate-grafted tea kud powder and biochanin A, the effect is best.

[0169] It can be seen from Example 2 and Example 5 and Table 2 that short-cut acetate and PLGA-chitosan composite microspheres are added to natural rubber, and short-cut acetate is adsorbed on the surface of PLGA-chitosan composite microspheres, which can be used as a bridge to effectively combine PLGA-chitosan composite microspheres with rubber molecular chains. PLGA-chitosan composite microspheres can participate in and form a three-dimensional network structure of materials in a cross-linked system, improve the elasticity and strength of natural rubber, and due to its abundant amino functional groups, can interact with rubber molecular chains, improve interfacial adhesion, and further improve the plasticity of natural rubber. In addition, short-cut acetate is combined with acrylate grafted modified tea rot powder, which can further improve the dispersibility of acrylate grafted modified tea rot powder in rubber system. Therefore, the initial value of plasticity and plasticity retention rate of natural rubber are further improved, and processability is also enhanced.

[0170] Combining Example 2, Example 5, Example 7 and Example 8 with Table 2, it can be seen that when chopped acetate fiber and PLGA-chitosan composite microspheres are used in combination with butyl rubber and acrylate grafted modified tea kud powder and chickpea sprout A, the best lifting effect can be achieved.

[0171] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A natural rubber with high PO and PRI, characterized in that: The invention comprises the following raw materials in parts by weight: 80 parts of natural rubber; Butyl rubber 20 parts; 1-2 parts of silane coupling agent; 1-2 parts of sodium lauryl sulfate; 3-5 parts of preservative; 7-9 parts of curing agent; 4-6 parts of acrylate grafted modified tea kud powder; 3-5 parts of chickpea sprouts A; The natural rubber is dry rubber in natural latex, and the natural latex is fresh forest latex obtained by centrifugation to separate non-rubber components, and the dry rubber content is 25wt%; The butyl rubber is derived from butyl latex with a solid content of 50 wt%.

2. The natural rubber with high PO and PRI according to claim 1, characterized in that: Each portion of the preservative comprises the following raw materials in parts by weight: 3-5 parts of nano titanium dioxide, 5-8 parts of ethyl paraben, 38-45 parts of chitosan, 45-55 parts of lysozyme and 3-5 parts of sodium metabisulfite.

3. The natural rubber with high PO and PRI according to claim 1, characterized in that: Each portion of the curing agent comprises the following raw materials in parts by weight: 60 to 81 parts of extracting solution, 5 to 7.5 parts of sodium bisulfate, and 10 to 15 parts of palmitic acid.

4. The natural rubber with high PO and PRI according to claim 3, characterized in that: The extract is a mixture of extracts of sorbitan, shanlihong and wild grapes, and the weight ratio of the sorbitan extract, shanlihong extract and wild grape extract is 1:1:

1.

5. The natural rubber with high PO and PRI according to claim 1, characterized in that: The preparation method of acrylate grafted modified tea kud powder is as follows: Mixing: Take tea dross powder and add it into anhydrous ethanol to completely disperse it evenly, then drop butyl acrylate and stir until it is evenly mixed, then add azobisisobutyronitrile and stir until it is evenly mixed to form a reaction mixture; the weight ratio of tea dross powder, butyl acrylate, azobisisobutyronitrile and anhydrous ethanol is 100:200:3:1000; Reaction: Place the reaction mixture in a 70°C oil bath and stir the reaction at constant temperature for 4 hours in an oxygen-free environment to allow the reaction to proceed fully; Post-treatment: After the reaction is completed, stop heating and cool to room temperature, filter to obtain a crude product, wash the crude product to remove residual impurities, and vacuum dry to obtain acrylate grafted modified tea kud powder.

6. The natural rubber with high PO and PRI according to claim 1, characterized in that: Natural rubber also includes the following raw materials in parts by weight: 3-5 parts of chopped acetate fiber; 3 to 5 parts of PLGA-chitosan composite microspheres.

7. The method for preparing a natural rubber with high P0 and PRI according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) Raw material preparation: Latex blending: take natural latex and butyl latex, adjust the pH to neutral respectively, add silane coupling agent to butyl latex for surface treatment, mix until uniform, then add the treated butyl latex to natural latex, stir and homogenize while adding, make the two latexes fully mixed, then add sodium dodecyl sulfate, mix evenly, filter, vacuum defoam, and obtain latex mixture; Preparation of the preservative: taking the raw materials of the preservative according to the ratio, mixing and stirring evenly to prepare the preservative, and diluting with deionized water to prepare a 10% aqueous solution of the preservative; Preparation of curing agent: Mix and stir the raw materials of curing agent according to the ratio to obtain curing agent, and dilute with deionized water to obtain a 10% aqueous solution of curing agent; Preparation of tea kud powder grafted with acrylate; (2) Mixing: Add 10% aqueous solution of preservative to the latex mixture according to the ratio, and stir evenly; then add acrylate grafted modified tea kud powder and chickpea sprout A according to the ratio, and stir evenly; (3) Curing: Add 10% aqueous solution of curing agent to the latex mixture according to the ratio, stir mechanically at room temperature to disperse evenly, and flocculate the latex evenly for 10 to 16 hours to obtain a coagulated rubber material; (4) Post-processing: The coagulated rubber is sequentially creped, granulated and dried at a temperature of 55 to 60°C for a drying time of 24 to 36 hours to obtain natural rubber.

8. The method for preparing a natural rubber with high PO and PRI according to claim 6, characterized in that: The following steps are involved: (1) Raw material preparation: Latex blending: take natural latex and butyl latex, adjust the pH to neutral respectively, add silane coupling agent to butyl latex for surface treatment, mix until uniform, then add the treated butyl latex to natural latex, stir and homogenize while adding, make the two latexes fully mixed, then add sodium dodecyl sulfate, mix evenly, filter, vacuum defoam, and obtain latex mixture; Preparation of the preservative: taking the raw materials of the preservative according to the ratio, mixing and stirring evenly to prepare the preservative, and diluting with deionized water to prepare a 10% aqueous solution of the preservative; Preparation of curing agent: Mix and stir the raw materials of curing agent according to the ratio to obtain curing agent, and dilute with deionized water to obtain a 10% aqueous solution of curing agent; Preparation of tea kud powder grafted with acrylate; (2) Mixing: Add 10% aqueous solution of preservative to the latex mixture according to the proportion, and stir evenly; then add acrylate grafted modified tea kudzu powder, biochanin A, chopped cellulose acetate and PLGA-chitosan composite microspheres according to the proportion, and stir evenly; (3) Curing: Add 10% aqueous solution of curing agent to the latex mixture according to the ratio, stir mechanically at room temperature to disperse evenly, and flocculate the latex evenly for 10 to 16 hours to obtain a coagulated rubber material; (4) Post-processing: The coagulated rubber is sequentially creped, granulated and dried at a temperature of 55 to 60°C for a drying time of 24 to 36 hours to obtain natural rubber.

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