Popcorn sole forming mold and sole preparation method thereof

Abstract

The invention relates to a popcorn sole forming mold and a sole preparation method thereof. The popcorn sole forming mold comprises an upper mold body, a lower mold body and a lower mold body, and an upper mold cavity with a downward opening is formed in the upper mold body; the lower die is internally provided with a lower die cavity with an upward opening, the bottom wall of the lower die cavity is provided with a groove used for forming the hollow-out bottom sheet, and the lower die cavity is internally provided with a convex part; the middle plate is arranged between the upper die and the lower die, a through hole used for containing a supporting piece is formed in the butt joint position of the left middle plate and the right middle plate, and an opening of the through hole corresponds to the protruding part. According to the shoe sole, the two-section crosslinking reaction is adopted, in-mold integrated forming is achieved, the preparation process is simplified, and the production efficiency is improved; a mixed solution of the stock solution A and the stock solution B is subjected to a cross-linking reaction in a mold to obtain a GPU pouring type thermosetting polyurethane negative film, then the popcorn midsole and the GPU negative film are subjected to a cross-linking reaction, the bonding strength is high, glue brushing or coating of a glue film is not needed, the glue brushing procedure is not needed, the production period is shorter, and production is lower in carbon and more environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of soles, in particular to a popcorn sole forming mould and a sole preparation method thereof. Background Art

[0002] Popcorn soles refer to soles made of expanded thermoplastic particles. Popcorn soles have many advantages, such as soft texture, good elasticity, good cushioning performance, low energy loss under pressure, good durability, good thermal insulation performance, etc. Its surface presents a granular appearance and texture, which is favored by many consumers.

[0003] In the traditional preparation of popcorn soles, the GPU bottom film and the popcorn midsole are solidified and formed in different molds, and then the popcorn midsole is glued to the GPU bottom film by brushing glue. The preparation process is complicated, the production efficiency is low, the glue easily pollutes the environment, and affects the health of workers. In addition, although the popcorn sole has the advantages of softness and good elasticity, its support performance is insufficient and it is easy to sprain, which is not a good experience as a running sole. Summary of the invention

[0004] The invention provides a popcorn sole forming mold and a method for preparing the sole, so as to overcome the problems of the existing popcorn soles, such as complicated preparation process, and environmentally unfriendly glue application.

[0005] The present invention adopts the following technical solution:

[0006] A popcorn sole forming mold, comprising:

[0007] An upper die, wherein an upper die cavity with an opening facing downward is provided in the upper die, and an upper feed port is provided at the top of the upper die;

[0008] A lower mold, wherein a lower mold cavity with an upward opening is provided in the lower mold, a bottom wall of the lower mold cavity is provided with a groove for forming a hollow bottom sheet, and a convex portion is provided in the lower mold cavity;

[0009] The middle plate is arranged between the upper mold and the lower mold. The middle plate is composed of a left middle plate and a right middle plate connected at the edges. The left middle plate and the right middle plate can be pulled out from the left and right directions of the mold respectively. A through hole for placing a support sheet is provided at the joint between the left middle plate and the right middle plate, and the orifice of the through hole corresponds to the above-mentioned convex portion; the middle plate is provided with a lower feed port.

[0010] A method for preparing a sole using a popcorn sole forming mold comprises the following steps:

[0011] Step 1, placing the lower mold opening upward on a workbench, preheating to 50° C. to 60° C., injecting a mixture of stock solution A and stock solution B into the lower mold, and the mixture flows into the above-mentioned groove, the heating temperature is 70° C. to 110° C., the time is 20 seconds to 100 seconds, preferably the heating temperature is 90° C., the heating time is 60 seconds, cross-linking and curing, and forming a hollow bottom sheet;

[0012] Step 2, a middle plate is placed on the top of the lower mold, a support sheet is arranged in the through hole between the left middle plate and the right middle plate, the upper mold and the lower mold are molded together, the convex part in the upper mold is tightly against the middle part of the support sheet, popcorn grain raw materials are injected into the upper mold feed port and the middle plate feed port to fill the upper mold cavity and the lower mold cavity, water vapor is passed to promote the formation of popcorn, and the water vapor heating time is controlled to make the surfaces of the popcorn grains stick together;

[0013] Step 3, the middle plate is pulled out from the left and right directions of the mold respectively, and heated to 130°C to 160°C, the popcorn in the lower mold and the GPU bottom plate undergo cross-linking reaction again, the popcorn in the upper mold and the popcorn in the lower mold are cross-linked and composited again, the support sheet is bonded between the upper layer of popcorn and the lower layer of popcorn, and cooled and solidified for 100 seconds to 350 seconds;

[0014] Step 4, open the mold to obtain the midsole popcorn and GPU bottom plate integrally formed sole.

[0015] Furthermore, the stock solution A is prepared by uniformly stirring polybutylene adipate, epoxy lacquer phenol, graphene oxide, TDI, butanediol, and stannous octoate, and the stock solution B is an aliphatic diisocyanate.

[0016] Furthermore, the hardness of the popcorn after molding in the upper mold is 15-45 Shore C, and the hardness of the popcorn after molding in the lower mold is 20-50 Shore C.

[0017] The stock solution A is prepared by uniformly stirring polyester diol, epoxy lacquer phenol, graphene oxide and a catalyst, and the stock solution B is an aliphatic diisocyanate.

[0018] The bottom wall of the lower mold cavity is provided with a groove for forming a hollow bottom sheet, and the depth of the groove is 1.5 mm to 3.8 mm, preferably 2 mm to 3.2 mm.

[0019] A convex portion is arranged in the lower mold cavity, and an air hole is arranged inside the convex portion; the air hole is connected to a vacuum device to tightly adsorb the support sheet to the convex portion in the upper mold.

[0020] The top and edge of the upper mold are provided with a plurality of air holes, wherein the area of ​​each of the first air holes is 0.01 square millimeters to 0.25 square millimeters.

[0021] The side wall of the lower mold is provided with a plurality of air holes, wherein the area of ​​each of the first air holes is 0.01 square millimeters to 0.25 square millimeters.

[0022] The middle plate is provided with a plurality of ventilation holes, wherein the area of ​​each of the first ventilation holes is 0.01 square millimeters to 0.25 square millimeters.

[0023] The middle plate is provided with a feed port, which opens from the side wall of the middle plate and communicates with the lower mold cavity.

[0024] The supporting sheet at least comprises one of a carbon fiber sheet, a nylon sheet and a polyurethane sheet, and the supporting sheet is preferably a carbon fiber sheet. A treatment agent is applied to the surface of the supporting sheet in advance to improve the bonding performance between the supporting sheet and the popcorn.

[0025] The above-mentioned stock solutions A and B are respectively stored in closed barrels at 45°C to 55°C. The pouring head blends the stock solutions A and B according to the set ratio, and then quickly pours the mixed liquid into the groove of the lower mold. The height of the mixed liquid in the groove is 0.8mm to 2.8mm.

[0026] The thickness of the hollow bottom sheet is 1.0 mm to 2.5 mm, and preferably the thickness of the hollow bottom sheet is 1.0 mm.

[0027] In the step 1, the heating temperature is preferably 80° C. to 100° C., and the heating time is preferably 30 seconds to 60 seconds.

[0028] In the above step 2, the hardness of the popcorn grain raw materials injected into the upper mold feed port and the middle plate feed port is different; the hardness of the popcorn grains injected into the middle plate feed port is higher by more than 5 degrees (Shore C).

[0029] The material type of the above popcorn particles includes at least one of thermoplastic polyurethane, nylon elastomer, polyester elastomer, and ethylene-vinyl acetate copolymer.

[0030] In the above step 3, the heating temperature is preferably 145° C., and the cooling and curing time is preferably 120 seconds.

[0031] From the above description of the structure of the present invention, it can be seen that compared with the prior art, the present invention has the following advantages:

[0032] 1. The sole of the present application adopts a two-stage cross-linking reaction to achieve in-mold integrated molding, simplify the preparation process, and improve production efficiency.

[0033] 2. The popcorn midsole of the present application has a cross-linking reaction with the GPU bottom film, and has high bonding strength. It does not require glue or glue film, and does not require a glue brushing process. The production cycle is shorter, and the production is more low-carbon and environmentally friendly.

[0034] 3. The sole of the present application has a support plate in the middle of the two layers of popcorn, which greatly improves the support performance of the sole. The upper layer of popcorn is softer and the lower layer of popcorn is harder, which can achieve better assistance and high elasticity, adapt to users' sports of different intensities, and give users a good experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the cross-sectional structure of the mold and the sole of the present invention.

[0036] Figure 2It is a bottom view structural schematic diagram of the sole of the present invention.

[0037] Figure 3 It is a schematic diagram of the top structure of the sole of the present invention.

[0038] Figure 4 The sole edge of the present invention Figure 2 Schematic diagram of the cross-sectional structure along the AA direction. DETAILED DESCRIPTION

[0039] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0040] A popcorn sole forming mold 1, comprising:

[0041] An upper mold 11, wherein an upper mold cavity 110 with an opening facing downward is provided in the upper mold 11, and an upper feed port 111 is provided on the top of the upper mold 11;

[0042] A lower mold 12, wherein a lower mold cavity 120 with an opening facing upward is provided in the lower mold 12, a groove 121 for forming the hollow bottom sheet 23 is provided on the bottom wall of the lower mold cavity 120, and a convex portion 122 is provided in the lower mold cavity 120;

[0043] The middle plate 10 is arranged between the upper mold 11 and the lower mold 12. The middle plate 10 is composed of a left middle plate 10 and a right middle plate 10 connected at the edges. The left middle plate 10 and the right middle plate 10 can be pulled out from the left and right directions of the mold 1 respectively. A through hole 101 for placing the support sheet 20 is provided at the connection between the left middle plate 10 and the right middle plate 10, and the orifice of the through hole 101 corresponds to the above-mentioned convex portion 122; the middle plate 10 is provided with a lower feed port 100.

[0044] The method for preparing a shoe sole by a popcorn shoe sole forming mold 1 comprises the following steps:

[0045] Step 1, placing the lower mold 12 on a workbench with the opening facing upward, preheating to 50° C. to 60° C., injecting a mixture of stock solution A and stock solution B into the lower mold 12, and the mixture flows into the above-mentioned groove 121, the heating temperature is 70° C. to 110° C., the time is 20 seconds to 100 seconds, preferably the heating temperature is 90° C., the heating time is 60 seconds, cross-linking and curing, and forming a hollow bottom sheet 23;

[0046] Step 2, cover the middle plate 10 on the top of the lower mold 12, a support sheet 20 is provided in the through hole 101 between the left middle plate 10 and the right middle plate 10, the upper mold 11 and the lower mold 12 are molded together, the convex portion 122 in the upper mold 11 is tightly against the middle of the support sheet 20, and popcorn grain raw materials are injected into the feed port 111 of the upper mold 11 and the feed port 111 of the middle plate 10 to fill the upper mold cavity 110 and the lower mold cavity 120, and water vapor is passed to promote the formation of popcorn, and the water vapor heating time is controlled to make the surfaces of the popcorn grains stick together;

[0047] Step 3, the middle plate 10 is pulled out from the left and right directions of the mold 1, and heated to 130° C. to 160° C., the popcorn in the lower mold 12 and the GPU bottom plate undergo cross-linking reaction again, the popcorn in the upper mold 11 and the popcorn in the lower mold 12 are cross-linked and composited again, the support sheet 20 is bonded between the upper layer of popcorn and the lower layer of popcorn, and cooled and solidified for 100 seconds to 350 seconds;

[0048] Step 4, open the mold to obtain the midsole popcorn and GPU bottom plate integrally formed sole.

[0049] The stock solution A is prepared by uniformly stirring polybutylene adipate, epoxy lacquer phenol, graphene oxide, TDI, butanediol and stannous octoate, and the stock solution B is hexamethylene diisocyanate.

[0050] The stock solution A is polybutylene adipate, epoxy lacquer phenol, graphene oxide, TDI, butanediol, and stannous octoate in a mass ratio of 95:40:5:1:40:0.1.

[0051] The hardness of the popcorn after being formed in the upper mold 11 is 15-45 Shore C, and the hardness of the popcorn after being formed in the lower mold 12 is 20-50 Shore C.

[0052] The bottom wall of the lower mold cavity 120 is provided with a groove 121 for forming the hollow bottom sheet 23, and the depth of the groove 121 is 1.5 mm to 3.8 mm, preferably 2 mm to 3.2 mm.

[0053] A convex portion 122 is provided in the lower mold cavity 120 , and an air hole is provided inside the convex portion; the air hole is connected to a vacuum device to tightly adsorb the support sheet 20 onto the convex portion 122 in the upper mold 11 .

[0054] The top and edge of the upper mold 11 are provided with a plurality of air holes, wherein the area of ​​each of the first air holes is 0.01 square millimeters to 0.25 square millimeters.

[0055] The side wall of the lower mold 12 is provided with a plurality of air holes, wherein the area of ​​each of the first air holes is 0.01 square millimeters to 0.25 square millimeters.

[0056] The middle plate 10 is provided with a plurality of ventilation holes, wherein the area of ​​each of the first ventilation holes is 0.01 square millimeters to 0.25 square millimeters.

[0057] The middle plate 10 is provided with a feed port 111 which opens from the side wall of the middle plate 10 and communicates with the lower mold cavity 120 .

[0058] The support sheet 20 comprises at least one of a carbon fiber sheet, a nylon sheet, and a polyurethane sheet, and the support sheet is preferably a carbon fiber sheet. A treatment agent is applied to the surface of the support sheet 20 in advance to improve the bonding performance between the support sheet 20 and the popcorn.

[0059] The above-mentioned stock solutions A and B are respectively stored in sealed barrels at 45°C to 55°C. The pouring head blends the stock solutions A and B according to the set ratio, and then quickly pours the mixed solution into the groove 121 of the lower mold 12. The height of the mixed solution in the groove 121 is 0.8 to 2.8 mm.

[0060] The thickness of the hollow bottom sheet 23 is 1.0 to 2.5 mm, and preferably the thickness of the hollow bottom sheet 23 is 1.0 mm.

[0061] In the above step 2, the hardness of the popcorn grain raw materials injected into the feed port 111 of the upper mold 11 and the feed port 111 of the middle plate 10 is different; the hardness of the popcorn grains injected into the feed port 111 of the middle plate 10 is higher by more than 5 degrees (Shore C).

[0062] Reference Figure 4 The sole is formed by stacking the midsole upper layer 21, the support sheet 20, and the midsole lower layer 22 in sequence and forming a composite integral body.

[0063] The material type of the above popcorn particles includes at least one of thermoplastic polyurethane, nylon elastomer, polyester elastomer, and ethylene-vinyl acetate copolymer.

[0064] In the above step 3, the heating temperature is preferably 145° C., and the cooling and curing time is preferably 120 seconds.

[0065] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A popcorn sole forming mold, characterized in that: include: An upper die, wherein an upper die cavity with an opening facing downward is provided in the upper die, and an upper feed port is provided at the top of the upper die; A lower mold, wherein a lower mold cavity with an upward opening is provided in the lower mold, a bottom wall of the lower mold cavity is provided with a groove for forming a hollow bottom sheet, and a convex portion is provided in the lower mold cavity; The middle plate is arranged between the upper mold and the lower mold. The middle plate is composed of a left middle plate and a right middle plate connected at the edges. The left middle plate and the right middle plate can be pulled out from the left and right directions of the mold respectively. A through hole for placing a support sheet is provided at the joint between the left middle plate and the right middle plate, and the orifice of the through hole corresponds to the convex portion; the middle plate is provided with a lower feed port.

2. The method for preparing a shoe sole by using a popcorn shoe sole forming mold according to claim 1, characterized in that: The following steps are involved: Step 1, placing the lower mold opening upward on a workbench, preheating to 50° C. to 60° C., injecting a mixture of stock solution A and stock solution B into the lower mold, and allowing the mixture to flow into the groove, heating at 70° C. to 110° C. for 20 seconds to 100 seconds, cross-linking and curing to form a hollow bottom sheet; Step 2, a middle plate is placed on the top of the lower mold, a support sheet is arranged in the through hole between the left middle plate and the right middle plate, the upper mold and the lower mold are molded together, the convex part in the upper mold is tightly against the middle part of the support sheet, popcorn grain raw materials are injected into the upper mold feed port and the middle plate feed port to fill the upper mold cavity and the lower mold cavity, water vapor is passed to promote the formation of popcorn, and the water vapor heating time is controlled to make the surfaces of the popcorn grains stick together; Step 3, the middle plate is pulled out from the left and right directions of the mold respectively, and heated to 130°C to 160°C, the popcorn in the lower mold and the GPU bottom plate undergo cross-linking reaction again, the popcorn in the upper mold and the popcorn in the lower mold are cross-linked and compounded again, the popcorn and the support plate are also bonded together, and cooled and cured for 100 seconds to 350 seconds; Step 4, open the mold to obtain the midsole popcorn and GPU bottom plate integrally formed sole.

3. The method for preparing a shoe sole by using a popcorn shoe sole forming mold as claimed in claim 2, characterized in that: The stock solution A is prepared by uniformly stirring polybutylene adipate, epoxy lacquer phenol, graphene oxide, TDI, butanediol, and stannous octoate, and the stock solution B is aliphatic diisocyanate.

4. The method for preparing a shoe sole by using a popcorn shoe sole forming mold according to claim 2, characterized in that: The support sheet includes at least one of a carbon fiber sheet, a nylon sheet, and a polyurethane sheet.

5. The method for preparing a shoe sole by using a popcorn shoe sole forming mold according to claim 2, characterized in that: The hardness of the popcorn after molding in the upper mold is 15-45 Shore C, and the hardness of the popcorn after molding in the lower mold is 20-50 Shore C.

6. The method for preparing a shoe sole by using a popcorn shoe sole forming mold according to claim 2, characterized in that: The thickness of the hollow bottom film is 1.0 mm to 2.5 mm.

Images