Double-color rubber sole for line book font identification and preparation process of double-color rubber sole

Abstract

The invention belongs to the technical field of rubber product manufacturing, and discloses a bicolor rubber sole for line book font identification and a preparation process. The rubber sole is composed of a bottom material layer and an identification material layer, the hardness of a bottom material is controlled to be 65 + / -3 HA, the hardness of an identification material is controlled to be 82 + / -3 HA, and by constructing the hardness gradient of about 17 HA, the identification material has excellent fluidity and edge supporting performance in the mold pressing process. And the molding thickness of the identification layer is strictly controlled to be 4.0-4.2 mm, so that a mold cavity can be completely filled with characters in the molding process, and the edges can be kept clear, not fuzzy and not diffused. According to the method, by decomposing stroke paths and optimizing pressure conduction, the high-hardness identification material is made to flow and fill accurately under pressure, and clear, attractive and wear-resistant identification characters are obtained. Through double mixing, calendering, isolation, mold pressing and co-vulcanization processes, integrated forming of the double-color rubber sole and the character identification is achieved, and the method is suitable for rubber products with high requirements for abrasion resistance and identification effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of rubber product manufacturing, and particularly relates to a double-color rubber sole with running script font identification and a preparation process. BACKGROUND

[0002] Rubber sole materials are widely used in the fields of soles, floor mats and identification mats, and have an important position in industry and consumer goods due to their excellent wear resistance, slip resistance and flexibility. In order to improve the additional functions and visual effects of the rubber sole, many products begin to integrate pattern or text layers with identification functions, which can not only realize brand display but also have decorative and guiding properties. However, the existing technology often uses post-spraying, silk-screen printing, lamination transfer or insert injection to form patterns, and these methods have the problems of poor adhesion, easy blurring of the font, poor wear resistance and easy discoloration, which are difficult to meet the requirements of long-term use and high-strength friction environment. In addition, for complex fonts (such as running script and cursive script), it is more difficult to control the pattern forming precision, edge definition and stable adhesion due to the continuous strokes and varied lines, which often leads to distortion of the font outline or easy falling off.

[0003] On the other hand, the double-color integrated molding technology in rubber products is relatively limited, especially in forming high-resolution font patterns through the control of material hardness difference and structure thickness, and there is still a lack of mature solutions. Therefore, how to develop a double-color rubber sole with identification layer and base layer synchronous molding vulcanization integrated forming, clear font effect and long-term wear resistance without discoloration, as well as the corresponding structure design, material matching and mold matching method, has become a key technical problem in the rubber industry to improve the functionality, aesthetics and recognizability of products. SUMMARY

[0004] To solve the problems mentioned in the background art, the purpose of the present application is to provide a double-color rubber sole with running script font identification and a preparation process, which realizes clear presentation and firm embedding of the font pattern by constructing a base layer and an identification layer composed of different hardness rubbers and using a molding vulcanization integrated forming process, and has the advantages of stable structure, strong wear resistance and excellent identification effect.

[0005] The purpose of the present application can be achieved by the following technical solutions: A two-color rubber sole with calligraphy font identification is formed by integrally molding and vulcanizing a base material layer and an identification material layer, wherein the base material layer comprises the following raw materials in parts by weight: polyisoprene rubber 10-20 parts, cis-butadiene rubber 40-70 parts, styrene-butadiene rubber 20-40 parts, white carbon black 40-50 parts, zinc oxide 3.0-4.0 parts, and a composite vulcanization accelerator system comprising IS-80 (insoluble sulfur pre-dispersion master batch), DM-75 (2,2'-dibenzothiazole disulfide pre-dispersion master batch), M-80 (2-mercaptobenzothiazole pre-dispersion master batch), and TS-80 (tetramethylthiuram monosulfide pre-dispersion master batch); The identification material layer comprises the following raw materials in parts by weight: cis-butadiene rubber 50-70 parts, styrene-butadiene rubber 40-60 parts, white carbon black 65-70 parts, zinc oxide 3.0-4.0 parts, and a composite vulcanization accelerator system comprising IS-80, DM-75, M-80, and TS-80; The base material layer and the identification material layer can further comprise one or more auxiliary agents selected from one or more of stearic acid, polyethylene glycol, coupling agent, lubricating oil, dispersing agent, antioxidant, anti-frosting agent, and paraffin wax.

[0006] Further preferably, the vulcanization accelerator system is composed of pre-dispersion master batches comprising two or more of IS-80, DM-75, M-80, and TS-80, and the master batches account for more than 95% of the total amount of the accelerator, and the addition amount of each master batch decreases in the order of IS-80, DM-75, M-80, and TS-80.

[0007] Further preferably, the white carbon black is precipitated silica with a BET specific surface area of 150-200 m² / g and an average particle size of 20-40 nm.

[0008] A preparation process of a two-color rubber sole with calligraphy font identification, comprising the following steps: S1. Mixing, banburying, and open-milling the raw materials of the base material and the identification material to obtain two kinds of rubber compounds; S2. calendering the base material rubber compound and the identification material rubber compound into sheets, and then performing isolation treatment on the surface of the rubber sheets; S3. laying the base material rubber sheet in the lower mold of the font mold, embedding the identification material rubber sheet on the surface according to the set font structure, and then performing molding operation after closing the mold; S4. performing heat vulcanization treatment on the structure in the hot press to obtain a two-color rubber sole with calligraphy font identification structure.

[0009] Further preferably, the hardness of the base material layer after vulcanization is 65±3 HA, and the hardness of the identification material layer is 82±3 HA.

[0010] Further preferably, the thickness of the molded product is controlled at 4.0-4.2 mm.

[0011] Further preferably, the heat vulcanization step in step S4 is performed at 155-165 DEG C for 6-8 minutes, and the pressure is 14-16 MPa.

[0012] Further preferably, the identification material sheet is subjected to die cutting before molding, and is cut into segments according to the font structure, and each character is formed by 2-5 segment cutter structures.

[0013] Further preferably, the base material sheet is provided with a plurality of positioning holes, and the identification material is assembled in position by passing through the positioning holes through the flower needle.

[0014] Further preferably, a fitting gap of 0.5-0.75 mm is provided between the base material sheet and the identification material sheet, so as to ensure that the identification material is fully filled in the font pattern area of the mold.

[0015] The present application has the following beneficial effects: The present application introduces different proportions and different hardness of rubber matrix in the base material layer and the identification material layer, combines an optimized auxiliary system and a composite vulcanization accelerator system, realizes the flow matching and interface fusion of the material in the mold vulcanization process, so that the font pattern can form a clear, continuous and visual effect without lifting and falling in the rubber base structure, and the appearance and durability of the product are significantly improved. Based on the composite adjustment mechanism of "hardness difference + thickness control + flow control", the hardness of the base material is controlled at 65±3 HA, the hardness of the identification material is controlled at 82±3 HA, and the identification layer is stably controlled at 4.0-4.2 mm, so as to ensure that the font edge is clear and the stroke is full, and it is especially suitable for running script font with complex structure and coherent strokes. At the same time, the composite vulcanization accelerator system composed of IS-80, DM-75, M-80 and TS-80 realizes the synergistic vulcanization reaction through the pre-dispersed master batch, improves the crosslinking efficiency and scorch safety in the molding process, and effectively avoids the problems of insufficient flow or premature crosslinking of the font edge. The matching multi-cutter font mold structure is further designed in position with the positioning hole and the flower needle, which further ensures the accurate filling and non-deviation of the identification material in the molding process, so that the pattern layer and the base material layer are integrally vulcanized and formed, without subsequent pasting or printing process, thereby significantly improving the consistency, wear resistance and service life of the product. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present application will be further described below with reference to the drawings.

[0017] Figure 1 The identification material cutting schematic diagram of the present application is shown in the figure. Figure 2Structure diagram of the bottom material and the marking material of the double-color rubber sole of the present application. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0019] Embodiment 1 A double-color rubber sole with a running script font mark is formed by integrally molding and vulcanizing a bottom material layer and a marking material layer, wherein the bottom material layer contains the following raw materials by weight: 10 parts of polyisoprene rubber, 40 parts of cis-butadiene rubber, 20 parts of butadiene-styrene rubber, 40 parts of white carbon black, 3.0 parts of zinc oxide, and a composite vulcanization accelerator system composed of IS-80, DM-75, M-80 and TS-80; The marking material layer contains the following raw materials by weight: 50 parts of cis-butadiene rubber, 40 parts of butadiene-styrene rubber, 65 parts of white carbon black, 3.0 parts of zinc oxide, and a composite vulcanization accelerator system composed of IS-80, DM-75, M-80 and TS-80; The preparation of the double-color rubber sole with a running script font mark includes the following steps: A 75-liter internal mixer is preheated to 90°C, and the materials are sequentially added and mixed. 3 kg of polyisoprene rubber, 12 kg of cis-butadiene rubber and 6 kg of butadiene-styrene rubber are added and subjected to 3-minute initial mixing. Then stearic acid, zinc oxide, polyethylene glycol, antioxidant BHT, paraffin wax, flow dispersant, 12 kg of white carbon black, coupling agent and oil-based lubricant are sequentially added and further mixed for 12 minutes. After mixing is completed, the hammer is swept to remove powder, and finally the hammer is swept again and pressed for 1 minute. After mixing is completed, the material is poured out, and after being pressed into a sheet by a 22-inch calender, passing water, and being treated with a liquid release agent, it is wound up for standby use. Then the bottom material sheet is put into an 18-inch rubber mill, and 0.34 kg of IS-80, 0.26 kg of DM-75, 0.08 kg of M-80, 0.02 kg of TS-80, and a certain amount of pigment as needed are sequentially added, and the rubber is uniformly mixed for standby use.

[0020] Preheat the internal mixer to 90°C. Add in order: 15 kg of butadiene rubber, 12 kg of styrene-butadiene rubber, pre-mix for 3 minutes. Continue to add: stearic acid, zinc oxide, polyethylene glycol, antioxidant BHT, paraffin wax, flow dispersant, then add 19.5 kg of white carbon black, coupling agent SI-69 and lubricating oil, mix for 12 minutes, then add additional pressure for 1 minute. After sheeting, pass through a 22-inch calender, water, spray liquid release agent, and roll up for use. Add the marking material to an 18-inch rubber mill, and add in order: 0.30 kg of IS-80, 0.21 kg of DM-75, 0.06 kg of M-80, 0.03 kg of TS-80, and as needed, add some pigment, and mix well for use.

[0021] Cut the base material sheet to the size of the mold, and place it in the lower mold of the font mold. The marking material sheet is cut according to the structure of the cursive font, and each character is divided into 2-5 segments, and is assembled by positioning and inserting the pins. Use a 10-inch calender for calendering, and control the mold thickness to be 4.0 mm. After closing the mold, place the mold into a flat vulcanizing machine, set the temperature to 155°C, the pressure to 14 MPa, and the pressure holding time to 7 minutes, demold and cool, trim the edges, and the double-color rubber base with cursive font marking is obtained.

[0022] Example 2 A double-color rubber base with cursive font marking is formed by integrally molding and vulcanizing a base material layer and a marking material layer, wherein: the base material layer contains the following raw materials by weight: polyisoprene rubber: 20 parts, butadiene rubber: 70 parts, styrene-butadiene rubber: 40 parts, white carbon black: 50 parts, zinc oxide: 4.0 parts, and contains a composite vulcanization accelerator system composed of IS-80, DM-75, M-80 and TS-80; The marking material layer contains the following raw materials by weight: butadiene rubber: 70 parts, styrene-butadiene rubber: 60 parts, white carbon black: 70 parts, zinc oxide: 4.0 parts, and contains a composite vulcanization accelerator system composed of IS-80, DM-75, M-80 and TS-80; The preparation of the double-color rubber base with cursive font marking includes the following steps: A 75 liter internal mixer was preheated to 100°C, and 6 kg of polyisoprene rubber, 21 kg of butadiene rubber, and 12 kg of styrene-butadiene rubber were sequentially added and subjected to preliminary mixing for 4 minutes. Subsequently, stearic acid, zinc oxide, polyethylene glycol, antioxidant BHT, paraffin wax, flow dispersant, coupling agent SI-69, lubricating oil, and 15 kg of white carbon black were sequentially added, and mixing was continued for a total of about 12 minutes. After mixing was completed, the mixer was lifted and the powder was swept, and 2 minutes of additional mixing was performed, and the material was discharged and sheeted. The material was sheeted using a 22 inch calender, water was passed through, liquid release agent was sprayed, and the material was wound for later use. The base material sheet was fed into an 18 inch mill, 0.36 kg of IS-80, 0.28 kg of DM-75, 0.10 kg of M-80, 0.04 kg of TS-80, and an appropriate amount of pigment were added, and the material was uniformly mixed and used.

[0023] The internal mixer was preheated to 100°C, and 21 kg of butadiene rubber and 18 kg of styrene-butadiene rubber were sequentially added, and after preliminary mixing for 4 minutes, stearic acid, zinc oxide, polyethylene glycol, antioxidant BHT, paraffin wax, flow dispersant, coupling agent SI-69, lubricating oil, and 21 kg of white carbon black were continuously added, and mixing was continued for 14 minutes. After the mixer was lifted and the powder was swept, and 2 minutes of additional mixing was performed, and the material was discharged and sheeted, and the sheet was calendered using a 22 inch calender, water was passed through, liquid release agent was sprayed, and the material was wound for later use. The base material sheet was fed into an 18 inch mill, 0.36 kg of IS-80, 0.27 kg of DM-75, 0.08 kg of M-80, 0.05 kg of TS-80, and an appropriate amount of pigment were added, and the material was uniformly mixed and used.

[0024] The base material sheet was cut to match the size of the mold, and was laid in the lower mold of the mold. The logo material sheet was die cut according to the structure of the running script font, each character was divided into 3-5 segments, and after precise molding by the die cutter, the pattern was aligned and embedded using the flower needle to complete the pre-positioning hole with the base material. The mold assembly was fed into a 10 inch calender, and the finished product was calendered to a thickness of 4.2 mm. After the mold was assembled, it was placed in a flat vulcanizing machine for hot press vulcanization, with a temperature of 165°C, a pressure of 16 MPa, and a time of 8 minutes. After demolding and cooling, the edges were trimmed, and the double-color rubber sole with running script font logo was obtained.

[0025] Example 3 A double-color rubber sole with a running script font logo was formed by integrally molding and vulcanizing a base material layer and a logo material layer, wherein the base material layer comprises the following raw materials by weight: polyisoprene rubber 15 parts, butadiene rubber 55 parts, styrene-butadiene rubber 30 parts, white carbon black 45 parts, zinc oxide 3.5 parts, and a composite vulcanization accelerator system composed of IS-80, DM-75, M-80, and TS-80; The marking material layer comprises the following raw materials by weight: butadiene rubber 60 parts, styrene butadiene rubber 50 parts, white carbon black 67.5 parts, zinc oxide 3.5 parts, and contains a composite vulcanization accelerator system composed of IS-80, DM-75, M-80 and TS-80; The preparation of the double-color rubber bottom with running script font marking includes the following steps: A 75 liter internal mixer was preheated to 95°C, and 4.5 kg of polyisoprene rubber, 16.5 kg of butadiene rubber and 9.0 kg of styrene butadiene rubber were added in sequence and mixed for 3.5 minutes at a rotor speed of 45 rpm. Subsequently, stearic acid, zinc oxide, polyethylene glycol, antioxidant BHT, paraffin wax, flow dispersant, coupling agent SI-69, lubricating oil and 13.5 kg of white carbon black were added in sequence, and the mixing was continued for a total time of 13 minutes. After that, the hammer was swept and re-pressed for 1.5 minutes, and the sheet was discharged for use. The obtained rubber sheet was sheeted by a 22 inch calender, with an initial thickness of about 6 mm, and then passed through water, sprayed with liquid release agent and dried before being wound up. The sheet was sent to an 18 inch rubber mixer, 0.35 kg of IS-80, 0.27 kg of DM-75, 0.09 kg of M-80, 0.03 kg of TS-80 and a certain amount of pigment were added, and the rubber was mixed uniformly before use.

[0026] The internal mixer was preheated to 95°C, and 18 kg of butadiene rubber and 15 kg of styrene butadiene rubber were added in sequence and mixed for 3.5 minutes. Subsequently, stearic acid, zinc oxide, polyethylene glycol, antioxidant BHT, paraffin wax, flow dispersant, coupling agent SI-69, lubricating oil and 20.25 kg of white carbon black were added, and the mixing was continued for 13 minutes. After that, the hammer was swept and re-pressed for 1.5 minutes. The sheet was sheeted by a 22 inch calender, passed through water, sprayed with release agent and wound up for standby use. The marking material rubber sheet was put into an 18 inch rubber mixer, 0.33 kg of IS-80, 0.24 kg of DM-75, 0.07 kg of M-80, 0.04 kg of TS-80 and a certain amount of pigment were added, and the rubber was mixed uniformly before use.

[0027] The bottom material rubber sheet was cut to the size of the mold and laid in the lower mold of the running script font mold, and the marking material rubber sheet was die cut according to the character structure, with each character being cut into 3-4 segments, and a positioning hole-flower needle structure was used to achieve high-precision fitting. After assembly, the sheet was sheeted by a 10 inch calender to form a thickness of 4.1 mm. Then it was put into a flat vulcanizing machine for hot press vulcanization, with a temperature of 160°C, a pressure of 14.5 MPa and a pressure holding time of 7 minutes. After demolding and cooling, the edges were trimmed, and the double-color rubber bottom was obtained.

[0028] Comparative Example 1 A two-color rubber sole with calligraphy font identification is formed by integrally molding and vulcanizing a base material layer and an identification material layer, wherein the base material layer comprises the following raw materials in parts by weight: polyisoprene rubber 15 parts, cis-butadiene rubber 55 parts, styrene-butadiene rubber 30 parts, white carbon black 45 parts, zinc oxide 3.5 parts, and a composite type vulcanization accelerator system composed of IS-80, DM-75, M-80 and TS-80; The identification material layer comprises the following raw materials in parts by weight: cis-butadiene rubber 60 parts, styrene-butadiene rubber 50 parts, white carbon black 45 parts, zinc oxide 3.5 parts, and a composite type vulcanization accelerator system composed of IS-80, DM-75, M-80 and TS-80; The hardness of the two-color rubber sole is adjusted by adjusting the amount of white carbon black in the identification material layer during preparation, so that the hardness is similar to that of the base material layer, and the remaining preparation steps are the same as those of Example 3.

[0029] Comparative Example 2 A two-color rubber sole with calligraphy font identification is formed by integrally molding and vulcanizing a base material layer and an identification material layer, wherein the base material layer comprises the following raw materials in parts by weight: polyisoprene rubber 15 parts, cis-butadiene rubber 55 parts, styrene-butadiene rubber 30 parts, white carbon black 45 parts, zinc oxide 3.5 parts, and a composite type vulcanization accelerator system composed of IS-80, DM-75, M-80 and TS-80; The identification material layer comprises the following raw materials in parts by weight: cis-butadiene rubber 60 parts, styrene-butadiene rubber 50 parts, white carbon black 67.5 parts, zinc oxide 3.5 parts, and a composite type vulcanization accelerator system composed of IS-80, DM-75, M-80 and TS-80; The two-color rubber sole is prepared by adjusting the amount of white carbon black in the identification material layer during preparation, so that the hardness is similar to that of the base material layer, and the remaining preparation steps are the same as those of Example 3.

[0030] Performance test 1. Font edge definition test The molded rubber sole sample is taken high-resolution photos under standard lighting conditions to obtain the front image. Image recognition software (ImageJ) is used to analyze the sharpness, continuity and broken pen defects of the font edge, and the original font outline is compared. Five professional reviewers are used to manually score the font definition (scoring standard is 1-10 points, the higher the better), and the average value is taken as the final evaluation index. Five characters are tested for each group of samples, and the average score is taken. The results are shown in Table 1.

[0031] Table 1. Font edge definition score

[0032] As can be seen from Table 1, Examples 1-3 all obtain higher font clarity scores (≥ 9.0), among which Example 2 performs best, with sharp font edges, full contours, moderate flow of the marking material in the mold cavity, and accurate filling of the font structure. Comparative Example 1, due to the removal of the hardness difference between the marking layer and the base material layer, results in excessive flow of the marking material during mold pressing, blurred font boundaries, severe deformation, and a significant decrease in the score, only 6.5. Comparative Example 2, although retaining the hardness difference design, has an ejection thickness exceeding 4.2 mm, resulting in abnormal spreading of the marking material in the font groove, edge material leakage, and distortion of the font contours, with a score of 6.2.

[0033] 2. Interlayer peeling strength test The double-color rubber base sample after mold pressing and vulcanization is cut into a "T-shaped peeling" structure with a width of 25 mm and a length of 150 mm, and a manual pre-peeling of the marking layer and the base material layer of 20 mm is used as the initial peeling section. The sample is clamped in an electronic universal material testing machine, with a peeling speed of 200 mm / min, and the maximum force value (N / 25 mm) in the stable peeling stage is recorded as the interfacial adhesion strength index. Five samples are tested for each group, and the average value is taken. This test is used to reflect the strength of the interfacial bonding force between the base material and the marking material under the co-vulcanization structure, and the results are shown in Table 2.

[0034] Table 2 Comparison of interlayer peeling strength

[0035] As can be seen from Table 2, the interlayer peeling strength of Examples 1-3 all remains above 30 N / 25 mm, indicating that a stable chemical cross-linking interface is formed between the base material layer and the marking material layer through the co-vulcanization process, and delamination does not easily occur during tearing. Among them, Example 2 performs best, reaching 35.2 N / 25 mm, indicating that the synergistic control of hardness difference and mold pressing thickness can maximize the interfacial bonding force. Comparative Example 1, due to the removal of the hardness difference, results in an unbalanced interfacial stress distribution, with a peeling strength of only 13.6 N / 25 mm; Comparative Example 2, due to a thickness exceeding the optimal window, results in stress concentration at the contact interface due to uneven mold pressing, further reducing the peeling strength to 11.9 N / 25 mm.

[0036] 3. Ejection thickness stability test The double-color rubber base sample after mold pressing and vulcanization is arranged according to the fixed measurement point arrangement principle, with five evenly distributed points selected on each sample, a digital thickness gauge with a precision of 0.01 mm is used for measurement, and the average thickness is calculated. In the test, the thickness fluctuation range is recorded synchronously, and whether the font area has defects such as "edge collapse", "thick edge bulge", or "stroke blur" is observed. Five samples are tested for each group, and the average value is taken as the ejection thickness stability index of the group. The results are shown in Table 3.

[0037] Table 3. Thickness stability test

[0038] As shown in Table 3, the average thickness of Examples 1-3 is stable in the design range of 4.0-4.2 mm, and the thickness fluctuation is controlled within ±0.1 mm, indicating that the molding process is uniform, the control precision is good, the font edge is filled completely, and there is no obvious bulging or collapse phenomenon. In particular, Example 2 has the smallest fluctuation (±0.06 mm), reflecting that the matching of the accelerator system and the rubber flowability is the best. Comparative Example 1 has uneven calendering due to the absence of a reasonable hardness difference, resulting in a thickness of 3.85 mm, and the edge appears to be broken. Comparative Example 2 has an out-of-mold thickness of more than 4.6 mm, the mold identification material is excessively diffused, and the edge is bulging and the font is blurred.

[0039] 4. Reproduction rate test of the mold To verify the structural memory and use stability of the double-color rubber bottom font identification, the mold vulcanized samples were placed in a thermostat for 70°C heat aging treatment for 48 hours, or in a bending device for 90° repeated bending for 100 times (cycle 3 s / time). Photographs were taken before and after the test and compared, and the font strokes were evaluated for whether they were broken, blurred, had indentation residues, or had decreased recognition, etc. A 3-person scoring group was used to score, with a full score of 10 points, and the average value was taken as the mold reproduction rate index, and the results are shown in Table 4.

[0040] Table 4. Mold reproduction rate results

[0041] As shown in Table 4, the mold reproduction scores of Examples 1-3 are all above 9.0, and in particular, Example 2 still has complete and clear font without indentation after heat aging and repeated bending, which reflects good structural stability and identification durability. This is due to the synergistic effect of the "hardness difference control" and "mold thickness" designed in the present application, which makes the identification material firmly embedded in the bottom material and effectively co-vulcanized, thereby having excellent structural memory.

[0042] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0043] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A two-color rubber sole for a cursive script logo, characterized by, The bottom layer and the marking layer are integrally molded and vulcanized, wherein the bottom layer comprises the following raw materials in parts by weight: polyisoprene rubber 10-20 parts, cis-butadiene rubber 40-70 parts, styrene-butadiene rubber 20-40 parts, white carbon black 40-50 parts, zinc oxide 3.0-4.0 parts, and a composite vulcanization accelerator system composed of IS-80, DM-75, M-80 and TS-80; The marking layer comprises the following raw materials in parts by weight: cis-butadiene rubber 50-70 parts, styrene-butadiene rubber 40-60 parts, white carbon black 65-70 parts, zinc oxide 3.0-4.0 parts, and a composite vulcanization accelerator system composed of IS-80, DM-75, M-80 and TS-80; The bottom layer and the marking layer can further comprise one or more auxiliary agents selected from one or more of stearic acid, polyethylene glycol, coupling agent, lubricating oil, dispersant, antioxidant, anti-frost agent, and paraffin wax.

2. The dual color rubber bottom of claim 1, wherein, The vulcanization accelerator system is composed of a pre-dispersed master batch containing two or more of IS-80, DM-75, M-80 and TS-80, the master batch accounts for more than 95% of the total amount of the accelerator, and the addition amount decreases in the order of IS-80, DM-75, M-80 and TS-80 by weight.

3. The dual color rubber bottom of claim 1, wherein, The white carbon black is a precipitated silica with a BET specific surface area of 150-200 m² / g and an average particle size of 20-40 nm.

4. Process for the production of a two-coloured rubber sole with identification of the calligraphic font, said two-coloured rubber sole being as claimed in any one of claims 1-3, characterised in that, The method comprises the following steps: S1. Mixing, mixing and mixing the raw materials of the bottom layer and the marking layer respectively to obtain two kinds of rubber; S2. Calendering the bottom layer and the marking layer respectively to obtain two kinds of rubber; S3. Laying the bottom layer rubber sheet in the lower mold of the font mold, embedding the marking layer rubber sheet on the surface according to the set font structure, and performing molding operation after closing the mold; S4. The structure after molding is heated and vulcanized in a hot press to obtain a double-color rubber bottom with a running script font marking structure.

5. The method of claim 4, wherein the dual color rubber sole is prepared by the steps of: The hardness of the bottom layer after vulcanization is 65±3 HA, and the hardness of the marking layer is 82±3 HA.

6. The method of claim 4, wherein the second rubber composition is injected into the first rubber composition at a temperature of 100 to 150°C. The thickness of the bottom layer and the marking layer after molding is controlled at 4.0-4.2 mm.

7. The method of claim 4, wherein the second rubber composition is injected into the first rubber composition at a temperature of 100 to 150°C. The vulcanization step in step S4 is carried out at 155-165℃ for 6-8 minutes, and the pressure is 14-16 MPa.

8. The method of claim 4, wherein the second rubber composition is injected into the first rubber composition at a temperature of 100 to 150°C. The marking layer rubber sheet is cut according to the font structure before molding, and each character is formed by 2-5 segment cutters.

9. The method of claim 4, wherein the dual color rubber sole is prepared by the steps of: The bottom layer rubber sheet is provided with a plurality of positioning holes, and the marking layer is assembled by passing through the positioning holes through the flower needle.

10. The method of claim 4, wherein the dual color rubber sole is prepared by the steps of: A fitting gap of 0.5-0.75 mm is provided between the bottom layer rubber sheet and the marking layer rubber sheet to ensure that the marking layer is fully filled in the font pattern area of the mold.

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