Plant shell powder modifier and preparation method thereof

Abstract

The invention relates to the technical field of modifiers, in particular to a plant shell powder modifier and a preparation method thereof.The preparation method includes the steps that walnut shell powder, phenolic compounds and amine compounds are added into a stirrer with a temperature control jacket, stirred to be uniform and dried in vacuum, and performance characterization parameters of the plant shell powder modifier are calculated to obtain the plant shell powder modifier. According to the method, the phenolic compound and the amine compound are added into the walnut shell powder to modify the walnut shell powder, the compatibility between the modified plant shell powder modifier and rubber is improved, the dispersing performance is improved, the process is simple, the cost is low, and the method is suitable for industrial production. The performance of the plant shell powder modifier and the performance of a rubber product prepared by adding the plant shell powder modifier are evaluated, and whether the performance of the plant shell powder modifier meets the standard or not can be reliably evaluated.

Description

Technical Field

[0001] The invention relates to the technical field of modifiers, in particular to a plant shell powder modifier and a preparation method thereof. Background Art

[0002] Green tires are a major development trend in the tire industry, and using green and sustainable materials to replace petrochemical raw materials is the focus of scientific research and production in the industry. Carbon black and white carbon black are the most important fillers in tire production, but the raw materials or production processes for their production consume a lot of energy and emit pollutants. Using biomass raw materials to replace carbon black and white carbon black is an important research topic in this industry. Walnut shells are waste from deep processing of walnuts. Currently, they are mainly used as filter materials, activated carbon raw materials, cat litter, and fertilizers. There has been some research on using walnut shell powder as a rubber filler. Because walnut shell powder is composed of cellulose and lignin, it has high surface polarity and poor compatibility with rubber. This leads to problems such as difficulty in dispersion and agglomeration.

[0003] Chinese patent publication number: CN110945070A, discloses a tire rubber modifier, which is a tire rubber modifier used to modify tire rubber, including rosin and styrene-(meth)acrylic acid copolymer, and the styrene-(meth)acrylic acid copolymer is a polymer containing monomer components of styrene monomers and (meth)acrylic acid monomers.

[0004] However, the prior art still has the following problems: Currently, silicone and ionic liquids are mainly used for surface modification. The process is complicated and the cost is high. In addition, the performance of the finished modifiers has not been evaluated, resulting in the problem that the effect of the modifiers cannot be reliably guaranteed. Summary of the invention

[0005] To this end, the present invention provides a plant shell powder modifier and a preparation method thereof, so as to overcome the problem that in the prior art, silicone and ionic liquid are mainly used for surface modification, the process is complicated, the cost is high, and the performance of the prepared modifier is not evaluated, resulting in that the effect of the modifier cannot be reliably guaranteed.

[0006] To achieve the above object, the present invention provides a method for preparing a plant shell powder modifier. Step S1, adding walnut shell powder, phenolic compounds, and amine compounds into a mixer with a temperature control jacket, stirring evenly, and vacuum drying to obtain a plant shell powder modifier; Step S2, taking a plant shell powder modifier sample, dropping a polar liquid on the surface of the plant shell powder modifier sample, obtaining the profile of the polar liquid droplet, and measuring the angle at the contact point between the polar liquid droplet and the surface of the plant shell powder modifier sample; Step S3, mixing the plant shell powder modifier and the rubber matrix, stirring with a stirring rod for a preset time, obtaining the force value of the stirring rod during the stirring process, and calculating the force value fluctuation value; Step S4, calculating the performance characterization parameter of the plant shell powder modifier according to the angle at the contact point between the polar liquid droplet and the surface of the plant shell powder modifier sample combined with the force value fluctuation value, and determining whether the plant shell powder modifier meets the preparation standard; Step S5, adopting a corresponding preparation strategy according to the determination result, including: Adjust the ratio of phenolic compounds and amine compounds, and repeat steps S1 to S4; Alternatively, the plant shell powder modifier is mixed with the rubber matrix to prepare a rubber product, and the length change of the rubber product after being stretched several times is obtained, and whether the rubber product meets the standard is judged according to the length change.

[0007] Furthermore, in step S1, the phenolic compounds include phenol, cresol, resorcinol, and cardanol, the amine compounds include urotropine, hexamethoxymelamine, and urea, and the molar ratio of the phenolic compounds to the amine compounds is 1:1-3:1.

[0008] Furthermore, in step S1, the temperature of the mixer is 50°C-70°C, the drying temperature is less than 100°C, and the water content of the plant shell powder modifier is less than 5%.

[0009] Furthermore, in step S3, the process of calculating the force value fluctuation value includes: A force sensor is provided on the stirring rod; Continuously obtain the force value of the stirring rod during the stirring process; Get several force values ​​and calculate the average value of the force values and the difference between each force value and the average force value; Calculate the average value of the difference between each force value and the average value of the force value; The average value of the difference between each force value and the average force value is recorded as the force value fluctuation value.

[0010] Furthermore, in step S4, the performance characterization parameter of the plant shell powder modifier is calculated according to formula (1): (1); In formula (1), D represents the performance characterization parameter of the plant shell powder modifier, θ represents the angle between the polar droplet and the surface of the plant shell powder modifier sample, θ0 represents the preset angle threshold, F represents the force value fluctuation value, and F0 represents the preset force value fluctuation value threshold.

[0011] Furthermore, in step S4, the process of determining whether the plant shell powder modifier meets the preparation standard includes: The performance characterization parameter of the plant shell powder modifier is compared with a preset plant shell powder modifier performance characterization parameter comparison threshold, If the performance characterization parameter of the plant shell powder modifier is less than the preset plant shell powder modifier performance characterization parameter comparison threshold, it is determined that the plant shell powder modifier meets the preparation standard; If the performance characterization parameter of the plant shell powder modifier is greater than or equal to a preset plant shell powder modifier performance characterization parameter comparison threshold, it is determined that the plant shell powder modifier does not meet the preparation standard.

[0012] Furthermore, in step S5, a corresponding preparation strategy is adopted according to the determination result. If it is determined that the plant shell powder modifier meets the preparation standard, the plant shell powder modifier is mixed with the rubber matrix to prepare a rubber product, and the length change of the rubber product after being stretched several times is obtained, and whether the rubber product meets the standard is determined according to the length change; If it is determined that the plant shell powder modifier does not meet the preparation standard, the ratio of the phenolic compound and the amine compound is adjusted, and steps S1 to S4 are repeated.

[0013] Furthermore, in step S5, the process of obtaining the length change of the rubber product after being stretched several times includes: Stretch the rubber product to a preset length and maintain it for a preset time; After several stretchings, the length of the rubber product is obtained; The difference in length between the rubber product before and after stretching is calculated, and the difference in length is recorded as the length change.

[0014] Furthermore, in step S5, the process of judging whether the rubber product meets the standard according to the length change includes: The length change is compared with a preset length change comparison threshold, If the length change is less than the preset length change comparison threshold, the rubber product is determined to meet the standards.

[0015] A plant shell powder modifier is prepared according to the plant shell powder modifier preparation method described above.

[0016] Compared with the prior art, the present invention adds walnut shell powder, phenolic compounds and amine compounds into a mixer with a temperature control jacket, stirs evenly, and performs vacuum drying. By calculating the performance characterization parameters of the plant shell powder modifier, it is determined whether the plant shell powder modifier meets the preparation standard, and a corresponding preparation strategy is adopted according to the determination result. The present invention adds phenolic compounds and amine compounds into the walnut shell powder to modify the walnut shell powder. The modified plant shell powder modifier has improved compatibility with rubber and improved dispersion performance. The process is simple and the cost is low. The performance of the plant shell powder modifier and the performance of a rubber product prepared by adding the plant shell powder modifier are evaluated, and whether the performance of the plant shell powder modifier meets the standard can be reliably evaluated.

[0017] In particular, the present invention modifies the walnut shell powder by adding phenolic compounds and amine compounds into the walnut shell powder, so that the modified plant shell powder modifier has improved compatibility with rubber, improved dispersibility, simple process and low cost.

[0018] In particular, the present invention calculates the performance characterization parameters of the plant shell powder modifier according to the angle at the contact point between the polar droplet and the surface of the plant shell powder modifier sample in combination with the force value fluctuation value. Since the walnut shell powder is composed of cellulose and lignin, the surface polarity is high and the compatibility with rubber is poor, which leads to dispersion difficulties, agglomeration and other problems. The surface polarity of the plant shell powder modifier can be characterized by obtaining the angle at the contact point between the polar droplet and the surface of the plant shell powder modifier sample, and the compatibility of the plant shell powder modifier with rubber can be obtained by obtaining the force value fluctuation value. By calculating the performance characterization parameters of the plant shell powder modifier, the surface polarity of the plant shell powder modifier and the compatibility of the plant shell powder with rubber can be reliably characterized to a certain extent, providing data support for the follow-up.

[0019] In particular, the present invention determines whether the plant shell powder modifier meets the preparation standard according to the performance characterization parameters of the plant shell powder modifier, adds phenolic compounds and amine compounds to the walnut shell powder to modify the walnut shell powder, and the modified plant shell powder modifier has improved compatibility with rubber and improved dispersion performance. When the performance characterization parameters of the plant shell powder modifier are small, it can be characterized that the surface polarity of the plant shell powder modifier and the compatibility with rubber are improved, and the performance of the plant shell powder modifier can be reliably judged.

[0020] In particular, the present invention determines whether the rubber product meets the standard based on the length change. After the performance of the plant shell powder modifier is improved, even if the surface polarity and compatibility of the plant shell powder modifier with rubber are improved, it cannot be guaranteed that the performance of the rubber product can be improved. By evaluating the performance of the rubber product prepared by adding the plant shell powder modifier, it can be reliably evaluated whether the performance of the plant shell powder modifier meets the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a step diagram of the method for preparing the plant shell powder modifier according to the embodiment of the invention; Figure 2 A logical decision diagram for determining whether a plant shell powder modifier meets the preparation standard according to an embodiment of the invention; Figure 3 Figure 1 is a diagram of the preparation strategy for the invention embodiment; Figure 4 This is a logic determination diagram for determining whether a rubber product conforms to a standard according to an embodiment of the invention. DETAILED DESCRIPTION

[0022] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0024] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0025] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] See also Figure 1-Figure 4 As shown, Figure 1 This is a step diagram of the method for preparing the plant shell powder modifier according to the embodiment of the invention. Figure 2 This is a logic decision diagram for determining whether the plant shell powder modifier meets the preparation standard according to the embodiment of the invention. Figure 3 The preparation strategy diagram for the embodiment of the invention is selected. Figure 4 In order to determine whether the rubber product meets the standard logic determination diagram of the embodiment of the invention, a method for preparing a plant shell powder modifier of the present invention comprises: Step S1, adding walnut shell powder, phenolic compounds, and amine compounds into a mixer with a temperature control jacket, stirring evenly, and vacuum drying to obtain a plant shell powder modifier; Step S2, taking a plant shell powder modifier sample, dropping a polar liquid on the surface of the plant shell powder modifier sample, obtaining the profile of the polar liquid droplet, and measuring the angle at the contact point between the polar liquid droplet and the surface of the plant shell powder modifier sample; Step S3, mixing the plant shell powder modifier and the rubber matrix, stirring with a stirring rod for a preset time, obtaining the force value of the stirring rod during the stirring process, and calculating the force value fluctuation value; Step S4, calculating the performance characterization parameter of the plant shell powder modifier according to the angle at the contact point between the polar liquid droplet and the surface of the plant shell powder modifier sample combined with the force value fluctuation value, and determining whether the plant shell powder modifier meets the preparation standard; Step S5, adopting a corresponding preparation strategy according to the determination result, including: Adjust the ratio of phenolic compounds and amine compounds, and repeat steps S1 to S4; Alternatively, the plant shell powder modifier is mixed with the rubber matrix to prepare a rubber product, and the length change of the rubber product after being stretched several times is obtained, and whether the rubber product meets the standard is judged according to the length change.

[0027] In this embodiment, a vacuum oven may be used for vacuum drying in step S1.

[0028] In this embodiment, in step S2, an optical microscope or a high-magnification device is used to observe the contour of the polar droplet, and the angle at the contact point between the polar droplet and the surface of the plant shell powder modifier sample is measured by image analysis software, and the image analysis software may be matlab.

[0029] In this embodiment, in step S3, a stirring rod is used for stirring for a preset time, wherein the preset time is selected within the range of [1 min, 2 min].

[0030] In this embodiment, the mass ratio of the walnut shell powder to the mass of the phenolic compound and the amine compound is 10:1-15:1.

[0031] In this embodiment, the specific method of mixing the plant shell powder modifier with the rubber matrix to prepare the rubber product is not limited. Optionally, after the plant shell powder modifier and the rubber matrix are mixed, they are preheated to facilitate the dispersion of the plant shell powder modifier and the mixing of the plant shell powder modifier and the rubber matrix. The temperature of the mixture is monitored and controlled to avoid overheating or premature vulcanization. After the mixing is completed, the mixed rubber is discharged from the rubber mixer to prepare for the next step of processing, such as extrusion, calendering or molding. The discharged rubber is cooled to reduce its temperature for subsequent processing. According to the design and requirements of the product, the mixed rubber is molded by an extruder, a calender or a mold to obtain a rubber product.

[0032] Specifically, in step S1, the phenolic compounds include phenol, cresol, resorcinol, and cardanol, the amine compounds include urotropine, hexamethoxymelamine, and urea, and the molar ratio of the phenolic compounds to the amine compounds is 1:1-3:1.

[0033] In this embodiment, the phenolic compound is preferably cardanol, and the amine compound is preferably urotropine. When urotropine is used, it is prepared into a 30% solution.

[0034] Specifically, in step S1, the temperature of the mixer is 50° C.-70° C., the drying temperature is less than 100° C., and the water content of the plant shell powder modifier is less than 5%.

[0035] Specifically, the present invention modifies the walnut shell powder by adding phenolic compounds and amine compounds into the walnut shell powder, so that the modified plant shell powder modifier has improved compatibility with rubber and improved dispersion performance, and has simple process and low cost.

[0036] Specifically, in step S3, the process of calculating the force value fluctuation value includes: A force sensor is provided on the stirring rod; Continuously obtain the force value of the stirring rod during the stirring process; Get several force values ​​and calculate the average value of the force values and the difference between each force value and the average force value; Calculate the average value of the difference between each force value and the average value of the force value; The average value of the difference between each force value and the average force value is recorded as the force value fluctuation value.

[0037] Specifically, in step S4, the performance characterization parameter of the plant shell powder modifier is calculated according to formula (1): (1); In formula (1), D represents the performance characterization parameter of the plant shell powder modifier, θ represents the angle between the polar droplet and the surface of the plant shell powder modifier sample, θ0 represents the preset angle threshold, F represents the force value fluctuation value, and F0 represents the preset force value fluctuation value threshold.

[0038] In this embodiment, θ0 is pre-measured in an experiment. A polar liquid is dropped on the surface of a walnut shell powder sample to obtain the profile of the polar liquid droplet. The angle at the contact point between the polar liquid droplet and the surface of the walnut shell powder sample is measured. Several experiments are performed to obtain an average angle θe. Let θ0 = a × θe, where a is the angle coefficient, 0.9 < a ​​< 1.1, F0 is selected in the range of [0.05Fe, 0.1Fe], where Fe is the average value of the force applied to the stirring rod during the stirring process.

[0039] Specifically, the present invention calculates the performance characterization parameters of the plant shell powder modifier according to the angle at the contact point between the polar droplet and the surface of the plant shell powder modifier sample in combination with the force value fluctuation value. Since the walnut shell powder is composed of cellulose and lignin, the surface polarity is high and the compatibility with rubber is poor, which leads to dispersion difficulties and agglomeration problems. The surface polarity of the plant shell powder modifier can be characterized by obtaining the angle at the contact point between the polar droplet and the surface of the plant shell powder modifier sample, and the compatibility of the plant shell powder modifier with rubber can be obtained by obtaining the force value fluctuation value. By calculating the performance characterization parameters of the plant shell powder modifier, the surface polarity of the plant shell powder modifier and the compatibility of the plant shell powder with rubber can be reliably characterized to a certain extent, providing data support for the follow-up.

[0040] Specifically, in step S4, the process of determining whether the plant shell powder modifier meets the preparation standard includes: The performance characterization parameter of the plant shell powder modifier is compared with a preset plant shell powder modifier performance characterization parameter comparison threshold, If the performance characterization parameter of the plant shell powder modifier is less than the preset plant shell powder modifier performance characterization parameter comparison threshold, it is determined that the plant shell powder modifier meets the preparation standard; If the performance characterization parameter of the plant shell powder modifier is greater than or equal to a preset plant shell powder modifier performance characterization parameter comparison threshold, it is determined that the plant shell powder modifier does not meet the preparation standard.

[0041] In this embodiment, the preset plant shell powder modifier performance characterization parameter comparison threshold is selected within the range of [1.55, 1.60].

[0042] Specifically, the present invention determines whether the plant shell powder modifier meets the preparation standard according to the performance characterization parameters of the plant shell powder modifier, adds phenolic compounds and amine compounds to the walnut shell powder to modify the walnut shell powder, and the modified plant shell powder modifier has improved compatibility with rubber and improved dispersion performance. When the performance characterization parameters of the plant shell powder modifier are small, it can be characterized that the surface polarity of the plant shell powder modifier and the compatibility with rubber are improved, and the performance of the plant shell powder modifier can be reliably judged.

[0043] Specifically, in step S5, a corresponding preparation strategy is adopted according to the determination result. If it is determined that the plant shell powder modifier meets the preparation standard, the plant shell powder modifier is mixed with the rubber matrix to prepare a rubber product, and the length change of the rubber product after being stretched several times is obtained, and whether the rubber product meets the standard is determined according to the length change; If it is determined that the plant shell powder modifier does not meet the preparation standard, the ratio of the phenolic compound and the amine compound is adjusted, and steps S1 to S4 are repeated.

[0044] Specifically, in step S5, the process of obtaining the length change of the rubber product after being stretched several times includes: Stretch the rubber product to a preset length and maintain it for a preset time; After several stretchings, the length of the rubber product is obtained; The difference in length between the rubber product before and after stretching is calculated, and the difference in length is recorded as the length change.

[0045] In this embodiment, the rubber product is stretched to a preset length, wherein the preset length is selected within the range of [1.5L, 1.8L], L is the length of the rubber product, and the preset duration is selected within the range of [2min, 5min].

[0046] Specifically, in step S5, the process of judging whether the rubber product meets the standard according to the length change includes: The length change is compared with a preset length change comparison threshold, If the length change is less than the preset length change comparison threshold, the rubber product is determined to meet the standards.

[0047] In this embodiment, the preset length change comparison threshold L0 is pre-measured in the experiment, and a number of rubber products without adding plant shell powder modifier are obtained, and the length change of the rubber products after several stretchings is obtained. The average length change Le is calculated, and L0=b×Le, 0.8<b<0.9, b is the length change coefficient.

[0048] Specifically, the present invention determines whether the rubber product meets the standard based on the length change. After the performance of the plant shell powder modifier is improved, even if the surface polarity and compatibility of the plant shell powder modifier with rubber are improved, it cannot be guaranteed that the performance of the rubber product can be improved. By evaluating the performance of the rubber product prepared by adding the plant shell powder modifier, it can be reliably evaluated whether the performance of the plant shell powder modifier meets the standard.

[0049] A plant shell powder modifier is prepared according to the plant shell powder modifier preparation method described above.

[0050] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for preparing a plant shell powder modifier, characterized in that: include: Step S1, adding walnut shell powder, phenolic compounds, and amine compounds into a mixer with a temperature control jacket, stirring evenly, and vacuum drying to obtain a plant shell powder modifier; Step S2, taking a plant shell powder modifier sample, dropping a polar liquid on the surface of the plant shell powder modifier sample, obtaining the profile of the polar liquid droplet, and measuring the angle at the contact point between the polar liquid droplet and the surface of the plant shell powder modifier sample; Step S3, mixing the plant shell powder modifier and the rubber matrix, stirring with a stirring rod for a preset time, obtaining the force value of the stirring rod during the stirring process, and calculating the force value fluctuation value; Step S4, calculating the performance characterization parameter of the plant shell powder modifier according to the angle at the contact point between the polar liquid droplet and the surface of the plant shell powder modifier sample combined with the force value fluctuation value, and determining whether the plant shell powder modifier meets the preparation standard; Step S5, adopting a corresponding preparation strategy according to the determination result, including: Adjust the ratio of phenolic compounds and amine compounds, and repeat steps S1 to S4; Alternatively, the plant shell powder modifier is mixed with the rubber matrix to prepare a rubber product, and the length change of the rubber product after being stretched several times is obtained, and whether the rubber product meets the standard is judged according to the length change.

2. The method for preparing the plant shell powder modifier according to claim 1, characterized in that: In the step S1, the phenolic compounds include phenol, cresol, resorcinol, and cardanol, the amine compounds include urotropine, hexamethoxymelamine, and urea, and the molar ratio of the phenolic compounds to the amine compounds is 1:1-3:

1.

3. The method for preparing the plant shell powder modifier according to claim 1, characterized in that: In the step S1, the temperature of the mixer is 50° C.-70° C., the drying temperature is less than 100° C., and the moisture content of the plant shell powder modifier is less than 5%.

4. The method for preparing the plant shell powder modifier according to claim 1, characterized in that: In step S3, the process of calculating the force value fluctuation value includes: A force sensor is provided on the stirring rod; Continuously obtain the force value of the stirring rod during the stirring process; Obtain several force values, calculate the average value of the force values, and the difference between each force value and the average value of the force value; Calculate the average value of the difference between each force value and the average value of the force value; The average value of the difference between each force value and the average force value is recorded as the force value fluctuation value.

5. The method for preparing the plant shell powder modifier according to claim 4, characterized in that: In step S4, the performance characterization parameter of the plant shell powder modifier is calculated according to formula (1). （1）； In formula (1), D represents the performance characterization parameter of the plant shell powder modifier, θ represents the angle between the polar droplet and the surface of the plant shell powder modifier sample, θ0 represents the preset angle threshold, F represents the force value fluctuation value, and F0 represents the preset force value fluctuation value threshold.

6. The method for preparing the plant shell powder modifier according to claim 1, characterized in that: In step S4, the process of determining whether the plant shell powder modifier meets the preparation standard includes: The performance characterization parameter of the plant shell powder modifier is compared with a preset plant shell powder modifier performance characterization parameter comparison threshold, If the performance characterization parameter of the plant shell powder modifier is less than the preset plant shell powder modifier performance characterization parameter comparison threshold, it is determined that the plant shell powder modifier meets the preparation standard; If the performance characterization parameter of the plant shell powder modifier is greater than or equal to a preset plant shell powder modifier performance characterization parameter comparison threshold, it is determined that the plant shell powder modifier does not meet the preparation standard.

7. The method for preparing the plant shell powder modifier according to claim 6, characterized in that: In step S5, a corresponding preparation strategy is adopted according to the determination result. If it is determined that the plant shell powder modifier meets the preparation standard, the plant shell powder modifier is mixed with the rubber matrix to prepare a rubber product, and the length change of the rubber product after being stretched several times is obtained, and whether the rubber product meets the standard is determined according to the length change; If it is determined that the plant shell powder modifier does not meet the preparation standard, the ratio of the phenolic compound and the amine compound is adjusted, and steps S1 to S4 are repeated.

8. The method for preparing the plant shell powder modifier according to claim 7, characterized in that: In step S5, the process of obtaining the length change of the rubber product after being stretched several times includes: Stretch the rubber product to a preset length and maintain it for a preset time; After stretching several times, the length of the rubber product is obtained; The difference in length before and after the rubber product is stretched is calculated, and the difference in length is recorded as the length change.

9. The method for preparing the plant shell powder modifier according to claim 8, characterized in that: In step S5, the process of judging whether the rubber product meets the standard according to the length change includes: The length change is compared with a preset length change comparison threshold, If the length change is less than the preset length change comparison threshold, the rubber product is determined to meet the standards.

10. A plant shell powder modifier, characterized in that: The plant shell powder modifier is prepared according to the method for preparing the plant shell powder modifier according to any one of claims 1 to 9.

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