Preparation process of composite sole for spiked shoes

Abstract

The invention relates to a preparation process of a composite sole for spiked shoes, the composite sole comprises a PU upper layer, a rubber middle layer and a felt bottom layer which are compounded in sequence, the preparation process of the composite sole comprises the following steps: S1, manufacturing a blank of the rubber middle layer by utilizing a middle layer mold, and the blank comprises a middle layer body and an extension part arranged at the periphery of the middle layer body; s2, compounding the rubber middle layer and the PU upper layer; s3, removing an extension part in the first composite part, brushing an adhesive on the lower surface of the middle-layer body, and placing the middle-layer body in an environment with the temperature of 40-55 DEG C for later use; s4, manufacturing a felt bottom layer, and bonding and fixing the felt bottom layer and the first composite part obtained in S3 to obtain a composite sole semi-finished product; and S5, further grinding and polishing the semi-finished product of the composite sole to obtain a finished product of the composite sole. According to the spiked shoe, the characteristics of different materials are optimized and combined, so that the spiked shoe has better stability and buffering performance in the using process.

Description

Technical Field

[0001] The invention relates to a preparation process of a composite sole for spiked shoes. Background Art

[0002] At present, spiked shoes are widely used in many fields, especially in sports competitions and outdoor activities. Traditional spiked shoe soles are mostly made of a single material, such as rubber or PU materials, but these materials have certain limitations in terms of wear resistance, cushioning and grip. For example, although the rubber sole has good wear resistance, its cushioning performance is relatively poor; while the PU material has good cushioning performance, but insufficient wear resistance. In addition, the soles of a single material are also difficult to meet the needs of different sports venues in terms of grip. Summary of the invention

[0003] Therefore, in order to solve the above-mentioned problems, the present invention proposes a process for preparing a composite sole for spiked shoes, which optimizes the combination of properties of different materials so that the spiked shoes have better stability and cushioning performance during use.

[0004] To achieve the above object, the present invention adopts the following technical scheme: a process for preparing a composite sole for spiked shoes, the composite sole comprising a PU upper layer, a rubber middle layer and a felt bottom layer which are compounded in sequence, and the process for preparing the composite sole comprises the following steps:

[0005] S1. Using a middle layer mold, a rubber middle layer embryo is made, which includes a middle layer body and an extension portion arranged around the middle layer body. The surface of the middle layer body is polished to form a frosted surface, and then adhesive is brushed on the upper surface and placed in an environment with a temperature of 40-55° for standby use;

[0006] S2, the rubber middle layer is compounded with the PU upper layer, and a foaming mold is manufactured according to the target shoe material, wherein the foaming mold comprises a base, a fixing frame, a molding mold frame and an upper cover, the embryo of the rubber middle layer is placed on the base, and the fixing frame, the molding mold frame and the upper cover are sequentially covered, wherein the fixing frame has an opening that can completely expose the middle layer body, and the pre-prepared PU upper layer material is injected into the molding mold frame, and after curing, the mold is formed and opened to obtain a first composite part;

[0007] S3, removing the extension part in the first composite part, and performing trimming and grinding treatment on the first composite part as a whole, and then applying adhesive on the lower surface of the middle body and placing it in an environment with a temperature of 40-55° for standby use;

[0008] S4, making a felt bottom layer, and bonding and fixing the felt bottom layer and the first composite member obtained in S3 to obtain a composite sole semi-finished product;

[0009] S5, further grinding and polishing the composite sole semi-finished product to obtain a composite sole finished product.

[0010] Further improved, in step S1, the embryo of the rubber middle layer includes the following raw materials in parts by weight: 20 parts of methyl vinyl silicone rubber, 30 parts of ethylene-vinyl acetate copolymer, 50 parts of thermoplastic polyurethane, 20 parts of high vinyl solution styrene-butadiene rubber, 1 part of polyurethane liquid rubber, 10 parts of sulfur, 4 parts of nano-silicon dioxide, 0.4 parts of γ-aminopropyl triethoxysilane, 5 parts of talc, and 0.5 parts of 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane;

[0011] The embryo of the rubber middle layer includes the following production steps:

[0012] ①, the first stage of mixing: in an open mill, firstly, the methyl vinyl silicone rubber is plasticized, and then 10 parts of ethylene-vinyl acetate copolymer is gradually added for preliminary mixing;

[0013] ②, the second stage of mixing: on the basis of the first stage of mixing, add the remaining ethylene-vinyl acetate copolymer, thermoplastic polyurethane, high vinyl solution styrene-butadiene rubber, polyurethane liquid rubber, nano-silica, talcum powder, sulfur and γ-aminopropyl triethoxysilane for mixing. When the above raw materials are evenly dispersed, add 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane and continue mixing to make it fully mixed;

[0014] ③. Molding treatment: the rubber compound obtained from the second stage of mixing is injected into a preheated middle layer mold for molding treatment, and then taken out and cooled to obtain the embryonic body of the rubber middle layer.

[0015] As a further improvement, a side surface of the rubber middle layer bonded to the felt bottom layer is provided with a plurality of spike mounting seats integrally formed therewith, and the felt bottom layer is provided with clearance holes for the spike mounting seats to pass through.

[0016] As a further improvement, a side surface of the rubber middle layer bonded to the PU upper layer is provided with a plurality of protrusions integrally formed therewith, and the protrusions are embedded in the PU upper layer.

[0017] Further improved, in the PU upper layer, the thickness of the heel area is 12-18 mm, and the thickness of the forefoot area is 6-10 mm.

[0018] According to a further improvement, the thickness of the rubber middle layer is 1-3 mm.

[0019] As a further improvement, the thickness of the felt bottom layer is 6-12 mm, and the height of the spike mounting seat is consistent with the thickness of the felt bottom layer.

[0020] As a further improvement, the shoe spike mounting seat is cylindrical, and its diameter is 12-20 mm.

[0021] By adopting the above technical solution, the beneficial effects of the present invention are:

[0022] 1. The composite sole of the present invention has a composite structure, which makes the spiked shoes have better stability and cushioning performance during use. The PU upper layer provides a soft and comfortable wearing experience, the rubber middle layer provides a firm support for the installation of the spikes, ensuring the stability and durability of the spiked shoes, and the felt bottom layer can improve the anti-slip property of the sole, providing good stability for the user when walking on smooth rocks, and further enhances the cushioning performance of the sole, reducing the wearer's fatigue during long-term use;

[0023] 2. In its manufacturing process, the embryo of the rubber middle layer is provided with an extension part, so that when the PU upper layer is foamed, it can play a role in positioning and fixing the middle layer body, preventing displacement or deformation when the PU upper layer material is injected for foaming. At the same time, according to the formed shape of the PU upper layer, the extension part is easy to remove;

[0024] 3. In the embryonic formula of the rubber middle layer, methyl vinyl silicone rubber, ethylene-vinyl acetate copolymer, thermoplastic polyurethane and high vinyl solution polystyrene-butadiene rubber are mixed to ensure that the rubber middle layer has a higher hardness after vulcanization, so that it can maintain flexibility while having better shape stability and support force to be suitable for the installation of shoe spikes. The addition of polyurethane liquid rubber further improves the uniformity and density of the raw materials. The addition of γ-aminopropyltriethoxysilane helps to evenly disperse nano-SiO2 in the rubber matrix, thereby improving the reinforcement effect of the rubber middle layer.

[0025] 4. In the first mixing stage, gradually adding 10 parts of ethylene-vinyl acetate copolymer helps to control the viscosity during the mixing process, avoids uneven mixing caused by adding too much material at one time, and provides a good foundation for the subsequent addition of other materials; in the second mixing stage, the remaining ethylene-vinyl acetate copolymer, thermoplastic polyurethane, high vinyl solution polystyrene-butadiene rubber, polyurethane liquid rubber, nano-silica, talcum powder, sulfur and γ-aminopropyl triethoxysilane and other materials are added. The comprehensive addition and mixing of the above materials makes the embryo of the rubber middle layer more balanced and comprehensive in performance, and improves the comprehensive performance of the product. Finally, 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane is added as a vulcanizing agent, and the mixing is continued to make it fully mixed, so that the rubber molecular chain undergoes a cross-linking reaction to form a three-dimensional network structure, so that the rubber has elasticity;

[0026] 5. By setting bulges on the rubber middle layer, the connection strength between it and the PU upper layer is strengthened;

[0027] 6. By optimizing the thickness ratio of each layer, the sole has better support and comfort in different areas. The thicker PU upper layer in the heel area can absorb more impact and reduce the impact on the heel, while the thinner design in the forefoot area ensures flexibility and lightness, making the wearer more agile during exercise. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a side structural schematic diagram of the present invention;

[0029] Figure 2 It is a schematic diagram of the explosion structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the reverse structure of the rubber middle layer of the present invention.

[0031] icon:

[0032] 1. PU upper layer; 2. Rubber middle layer; 21. Protrusion; 22. Shoe spike mounting seat; 3. Felt bottom layer; 31. Clearance hole. DETAILED DESCRIPTION

[0033] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0034] refer to Figure 1-3 The present embodiment provides a composite sole for spiked shoes, comprising a sole body, wherein the sole body comprises a PU upper layer 1, a rubber middle layer 2 and a felt bottom layer 3 bonded in sequence, a side surface of the rubber middle layer 2 bonded to the felt bottom layer 3 is provided with a plurality of spike mounting seats 22 integrally formed therewith, the spike mounting seats 22 are cylindrical, the felt bottom layer 3 is provided with a clearance hole 31 for the spike mounting seats 22 to pass through, the clearance hole 31 is interference fit with the spike mounting seats 22, the felt bottom layer 3 is made of fiber, has good friction, can improve the anti-slip property of the sole, and can provide good stability for the user when walking on smooth rocks, a side surface of the rubber middle layer 2 bonded to the PU upper layer 1 is provided with a plurality of protrusions 21 integrally formed therewith, the protrusions 21 are embedded in the PU upper layer 1, and the outer surface of the PU upper layer 1 is a frosted surface. The position of the protrusion 21 corresponds to the position of the shoe spike mounting seat 22, so that it can strengthen the connection strength with the PU upper layer 1 while providing more thickness support for the installation of the shoe spike.

[0035] The sole of the present invention has a composite structure, so that the spiked shoe has better stability and cushioning performance during use. The PU upper layer 1 provides a soft and comfortable wearing experience, the rubber middle layer 2 provides a firm support for the installation of the spikes, ensuring the stability and durability of the spiked shoe, and the felt bottom layer 3 can improve the anti-slip property of the sole, providing good stability for the user when walking on smooth rocks, and further enhances the cushioning performance of the sole, so that the wearer can reduce fatigue during long-term use.

[0036] In this embodiment, in the PU upper layer 1, the thickness of the heel area is 12-18 mm, the thickness of the forefoot area is 6-10 mm, the thickness of the rubber middle layer 2 is 1-3 mm, the thickness of the felt bottom layer 3 is 6-12 mm, the height of the spike mounting seat 22 is consistent with the thickness of the felt bottom layer 3, and the diameter is 12-20 mm.

[0037] The preparation process of the composite sole for spiked shoes comprises the following steps:

[0038] S1. Using a middle layer mold, a rubber middle layer embryo is made, which includes a middle layer body and an extension portion arranged around the middle layer body. The surface of the middle layer body is polished to form a frosted surface, and then adhesive is brushed on the upper surface and placed in an environment with a temperature of 40-55° for standby use, so that the colloid remains active;

[0039] S2, the rubber middle layer is compounded with the PU upper layer, and a foaming mold is manufactured according to the target shoe material, wherein the foaming mold comprises a base, a fixing frame, a molding mold frame and an upper cover, the embryo of the rubber middle layer is placed on the base, and the fixing frame, the molding mold frame and the upper cover are sequentially covered, wherein the fixing frame has an opening that can completely expose the middle layer body, and the pre-prepared PU upper layer material is injected into the molding mold frame, and after curing, the mold is formed and opened to obtain a first composite part;

[0040] S3, removing the extension part in the first composite part, and performing trimming and grinding treatment on the first composite part as a whole, and then applying adhesive on the lower surface of the middle body and placing it in an environment with a temperature of 40-55° for standby use;

[0041] S4, making a felt bottom layer, and bonding and fixing the felt bottom layer and the first composite member obtained in S3 to obtain a composite sole semi-finished product;

[0042] S5, further grinding and polishing the composite sole semi-finished product to obtain a composite sole finished product.

[0043] Among them, in step S1, the embryo of the rubber middle layer includes the following raw materials in parts by weight: 20 parts of methyl vinyl silicone rubber, 30 parts of ethylene-vinyl acetate copolymer, 50 parts of thermoplastic polyurethane, 20 parts of high vinyl solution styrene-butadiene rubber, 1 part of polyurethane liquid rubber, 10 parts of sulfur, 4 parts of nano-silicon dioxide, 0.4 parts of γ-aminopropyl triethoxysilane, 5 parts of talc, and 0.5 parts of 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane. The embryo of the rubber middle layer includes the following production steps:

[0044] ①, the first stage of mixing: in an open mill, firstly, the methyl vinyl silicone rubber is plasticized, and then 10 parts of ethylene-vinyl acetate copolymer is gradually added for preliminary mixing;

[0045] ②, the second stage of mixing: on the basis of the first stage of mixing, add the remaining ethylene-vinyl acetate copolymer, thermoplastic polyurethane, high vinyl solution styrene-butadiene rubber, polyurethane liquid rubber, nano-silica, talcum powder, sulfur and γ-aminopropyl triethoxysilane for mixing. When the above raw materials are evenly dispersed, add 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane and continue mixing to make it fully mixed;

[0046] ③. Molding treatment: the rubber compound obtained from the second stage of mixing is injected into a preheated middle layer mold for molding treatment, and then taken out and cooled to obtain the embryonic body of the rubber middle layer.

[0047] Among them, the rubber middle layer embryo is provided with an extension part, so that when the PU upper layer is foamed, the extension part can position and fix the middle layer body to prevent displacement or deformation when the PU upper layer material is injected for foaming. At the same time, according to the formed shape of the PU upper layer, the extension part is easy to remove.

[0048] In the embryo formula of the rubber middle layer, methyl vinyl silicone rubber, ethylene-vinyl acetate copolymer, thermoplastic polyurethane, high vinyl solution polystyrene butadiene rubber, polyurethane liquid rubber and other auxiliary materials are mixed to ensure that the rubber middle layer has a higher hardness after vulcanization, so that it can maintain flexibility while having better shape stability and supporting force to be suitable for the installation of shoe spikes. Specifically, ethylene-vinyl acetate copolymer can improve the processing performance and physical and mechanical properties of methyl vinyl silicone rubber. Thermoplastic polyurethane and methyl vinyl silicone rubber have good compatibility and can form a uniform mixture to improve the wear resistance, tear resistance and elasticity of the product. High vinyl solution polystyrene butadiene rubber can form a more stable cross-linking structure with methyl vinyl silicone rubber. As a liquid rubber, polyurethane liquid rubber can better penetrate between the various raw materials to form a stronger interface bonding force. The addition of γ-aminopropyltriethoxysilane helps to evenly disperse nano-SiO2 in the rubber matrix, thereby improving the reinforcement effect of the rubber middle layer.

[0049] In the first mixing stage, gradually adding 10 parts of ethylene-vinyl acetate copolymer helps to control the viscosity during the mixing process, avoids uneven mixing caused by adding too much material at one time, and provides a good foundation for the subsequent addition of other materials; in the second mixing stage, the remaining ethylene-vinyl acetate copolymer, thermoplastic polyurethane, high vinyl solution styrene-butadiene rubber, polyurethane liquid rubber, nano-silica, talc, sulfur and γ-aminopropyltriethoxysilane and other materials are added. The comprehensive addition and mixing of the above materials makes the rubber middle layer embryo more balanced and comprehensive in performance, improves the comprehensive performance of the product, and finally adds 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane as a vulcanizing agent, and continues to mix it fully, so that the rubber molecular chain undergoes a cross-linking reaction to form a three-dimensional network structure, which makes the rubber elastic.

[0050] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A process for preparing a composite sole for spiked shoes, characterized in that: The composite sole comprises a PU upper layer, a rubber middle layer and a felt bottom layer which are composited in sequence, and the preparation process of the composite sole comprises the following steps: S1. Using a middle layer mold, a rubber middle layer embryo is made, which includes a middle layer body and an extension portion arranged around the middle layer body. The surface of the middle layer body is polished to form a frosted surface, and then adhesive is brushed on the upper surface and placed in an environment with a temperature of 40-55° for standby use; S2, the rubber middle layer is compounded with the PU upper layer, and a foaming mold is manufactured according to the target shoe material, wherein the foaming mold comprises a base, a fixing frame, a molding mold frame and an upper cover, the embryo of the rubber middle layer is placed on the base, and the fixing frame, the molding mold frame and the upper cover are sequentially covered, wherein the fixing frame has an opening that can completely expose the middle layer body, and the pre-prepared PU upper layer material is injected into the molding mold frame, and after curing, the mold is formed and opened to obtain a first composite part; S3, removing the extension part in the first composite part, and performing trimming and grinding treatment on the first composite part as a whole, and then applying adhesive on the lower surface of the middle body and placing it in an environment with a temperature of 40-55° for standby use; S4, making a felt bottom layer, and bonding and fixing the felt bottom layer and the first composite member obtained in S3 to obtain a composite sole semi-finished product; S5, further grinding and polishing the composite sole semi-finished product to obtain a composite sole finished product.

2. The process for preparing a composite sole for spiked shoes according to claim 1, characterized in that: In step S1, the embryo of the rubber middle layer includes the following raw materials in parts by weight: 20 parts of methyl vinyl silicone rubber, 30 parts of ethylene-vinyl acetate copolymer, 50 parts of thermoplastic polyurethane, 20 parts of high vinyl solution styrene-butadiene rubber, 1 part of polyurethane liquid rubber, 10 parts of sulfur, 4 parts of nano-silicon dioxide, 0.4 parts of γ-aminopropyl triethoxysilane, 5 parts of talc, and 0.5 parts of 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane; The embryo of the rubber middle layer includes the following production steps: ①, the first stage of mixing: in an open mill, firstly, the methyl vinyl silicone rubber is plasticized, and then 10 parts of ethylene-vinyl acetate copolymer is gradually added for preliminary mixing; ②, the second stage of mixing: on the basis of the first stage of mixing, add the remaining ethylene-vinyl acetate copolymer, thermoplastic polyurethane, high vinyl solution styrene-butadiene rubber, polyurethane liquid rubber, nano-silica, talcum powder, sulfur and γ-aminopropyl triethoxysilane for mixing. When the above raw materials are evenly dispersed, add 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane and continue mixing to make it fully mixed; ③. Molding treatment: the rubber compound obtained from the second stage of mixing is injected into a preheated middle layer mold for molding treatment, and then taken out and cooled to obtain the embryonic body of the rubber middle layer.

3. The process for preparing a composite sole for spiked shoes according to claim 1, characterized in that: A side surface where the rubber middle layer is bonded to the felt bottom layer is provided with a plurality of shoe spike mounting seats integrally formed therewith, and the felt bottom layer is provided with clearance holes for the shoe spike mounting seats to pass through.

4. The process for preparing a composite sole for spiked shoes according to claim 3, characterized in that: A side surface of the rubber middle layer bonded to the PU upper layer is provided with a plurality of protrusions integrally formed therewith, and the protrusions are embedded in the PU upper layer.

5. The process for preparing a composite sole for spiked shoes according to claim 3, characterized in that: In the PU upper layer, the thickness thereof in the heel area is 12-18mm, and the thickness thereof in the forefoot area is 6-10mm.

6. The process for preparing a composite sole for spiked shoes according to claim 4, characterized in that: The thickness of the rubber middle layer is 1-3 mm.

7. The process for preparing a composite sole for spiked shoes according to claim 6, characterized in that: The thickness of the felt bottom layer is 6-12 mm, and the height of the shoe spike mounting seat is consistent with the thickness of the felt bottom layer.

8. The process for preparing a composite sole for spiked shoes according to claim 7, characterized in that: The shoe spike mounting seat is cylindrical, and its diameter is 12-20 mm.

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