Chemically foamed blends and methods of making foamed part end products therefrom

Abstract

The present invention provides a chemical foaming blend containing a reaction product of a phase change material, comprising a thermoplastic material, an ion resin, a phase change material, a foaming agent and a bridging agent; the ion resin is a product of a neutralization reaction between an acid resin and a metal salt of stearic acid; the phase change material is stearic acid, which is a product of a reaction between the metal salt of stearic acid and the acid resin; and another embodiment provides a method for manufacturing a foamed part from the aforementioned chemical foaming blend, comprising the steps of filling the aforementioned chemical foaming blend into a mold, heating and foaming and bridging reaction to form a foamed part semi-product, and placing the foamed part semi-product in a forming environment to shrink form a foamed part product. This method can shorten the cooling shrinkage time of the process and allow the foamed part product to have the characteristics of low density and lightweight.

Description

Technical Field

[0001] This invention relates to the field of chemical foaming blends, and more particularly to a chemical foaming blend and a method for producing foamed components from it. Background Technology

[0002] Finished foam components, such as shoe bodies (including midsoles and outsoles), protective gear, and insoles, are often made using chemical foaming. The known process for producing finished chemically foamed components involves filling a foaming mold with hot-melt foaming material and heating it to form a semi-finished foam component. When the mold is opened, the semi-finished component expands instantly due to foaming and then gradually cools and shrinks. Because the temperature of the external environment affects the dimensional shrinkage of the semi-finished component, it can easily cause significant dimensional differences between the finished foam component and the semi-finished foam component.

[0003] To control the dimensional shrinkage stability of the semi-finished foamed component after mold opening, the semi-finished foamed component is usually placed in an oven for cooling and shrinkage during the foaming process. This reduces the impact of ambient temperature on the semi-finished foamed component. The oven is usually set to multi-stage temperature cooling, for example, the temperature conditions are set to 70℃-60℃-50℃-45℃-45℃. The temperature is set to cool from 70℃ for a period of time and then gradually decrease to 45℃ for cooling. The total cooling and shrinkage time is set to 45 minutes. The multi-stage temperature control of the oven can slow down the dimensional shrinkage of the semi-finished foamed component.

[0004] However, the use of multi-stage temperature control in this oven increases energy consumption, and the molding time of the foamed component semi-finished product needs to be coordinated with the multi-stage temperature conditions of the oven, thus failing to improve the overall efficiency of the process. In addition, in the existing chemical foamed component finished product development technology, it is difficult to achieve low density and lightweight physical properties, and even the physical strength of the chemical foamed component finished product cannot be effectively enhanced. Therefore, how to improve the efficiency of the chemical foaming process of the foamed component finished product and achieve low density chemical foamed component finished product is the technical problem that this invention aims to solve. Summary of the Invention

[0005] In view of this, the object of the present invention is to provide a chemical foaming blend containing a phase change material generated by a reaction and a method for manufacturing a finished foamed component. The chemical foaming blend can effectively enhance the physical strength of the finished foamed component, giving the finished foamed component low density and lightweight characteristics, and the phase change material generated by the reaction can provide the effect of shortening the molding and cooling time of the finished foamed component.

[0006] To achieve the above objectives, the present invention provides a chemical foaming blend containing a phase change material generated by a reaction, used to foam a finished foamed component, which is used to form part of a sporting good. The chemical foaming blend containing the phase change material includes a thermoplastic material, an ionomer resin, a phase change material, a foaming agent, and a crosslinking agent. The ionomer resin is mixed with the thermoplastic material; the ionomer resin is generated by a neutralization reaction between an acidic resin and a metal stearate salt, and the acidic resin forms partial ionic bonds. The phase change material is mixed with the thermoplastic material; the phase change material is stearic acid, generated by a reaction between a metal stearate salt and the acidic resin. The foaming agent is mixed with the thermoplastic material, the ionomer resin, and the phase change material. The crosslinking agent is mixed with the thermoplastic material, the ionomer resin, and the phase change material. The finished foamed component has a particle size distribution between 0.05 and 0.20 g / cm³. 3 The specific gravity range is within the range of 25 to 60, and the hardness (Shore C) is between 25 and 60.

[0007] The present invention also provides a method for preparing a finished foamed component from a chemical foaming blend containing a phase change material generated by a reaction, comprising the following steps:

[0008] Step S1: A thermoplastic material, an acidic resin, a metal stearate, a foaming agent, and a crosslinking agent are mixed to form a chemical foaming blend, wherein the acidic resin reacts with the metal stearate to generate an ion-bonded resin, and the acidic resin forms partial ionic bonds; wherein the metal stearate reacts with the acidic resin to generate a phase change material, namely stearic acid.

[0009] Step S2 involves filling the chemical foaming blend into a mold and heating it to undergo a foaming and cross-linking reaction, forming a semi-finished foamed component, wherein the phase change material stores heat energy during the foaming process; and

[0010] Step S3: Remove the semi-finished foamed component from the mold and place it in a molding environment. The temperature of the molding environment is not higher than the transition temperature of the phase change material. The phase change material releases its stored heat energy in the molding environment, causing the semi-finished foamed component to shrink and form a finished foamed component. The finished foamed component is used as part of a sporting good, wherein the finished foamed component has a density between 0.05 and 0.20 g / cm³. 3 The specific gravity range is within the range of 25 to 60, and the hardness (Shore C) is between 25 and 60.

[0011] The advantage of this invention is that the chemical foaming blend containing the phase change material generated by the reaction is produced by neutralizing the acidic resin with the stearic acid metal salt to generate the ion exchange resin and the phase change material. The ion exchange resin can effectively enhance the physical strength of the finished foamed component and give the finished foamed component low density and lightweight characteristics. Furthermore, the finished foamed component contains stearic acid generated by the reaction of the stearic acid metal salt with the acidic resin as a phase change material, which provides the effect of shortening the molding and cooling time of the finished foamed component.

[0012] Furthermore, in the method steps of making a finished foamed component from the chemical foaming blend, when the chemical foaming blend is heated and foamed in the mold, the phase change material can store heat energy during the heated foaming process of the chemical foaming blend. After the semi-finished foamed component is taken out of the mold, it is placed in the molding environment. Since the temperature of the molding environment is set lower than the transformation temperature of the phase change material, the phase change material in the semi-finished foamed component releases the stored heat energy, allowing the semi-finished foamed component to maintain a certain temperature. This allows the semi-finished foamed component to have uniform thermal shrinkage after the mold is opened, thereby shortening the cooling shrinkage time of the process and improving the shrinkage yield of the process. Attached Figure Description

[0013] Figure 1 This is a flowchart illustrating the steps of a method for producing a foamed component from a chemical foaming blend containing a phase change material generated by a reaction, according to a preferred embodiment of the present invention. Detailed Implementation

[0014] To more clearly illustrate the present invention, preferred embodiments are described in detail below with reference to the accompanying drawings. The present invention provides a chemical foaming blend comprising a phase change material generated by a reaction, used to foam a finished foamed component. This finished foamed component is used to form part of a sporting good, which includes a shoe body and protective gear. The finished foamed component includes various foamed materials such as a midsole, outsole, protective gear padding, and cushioning. The finished foamed component can serve as a cushioning component of the sporting good. In this embodiment, the finished foamed component has a density between 0.05 and 0.20 g / cm³. 3 The specific gravity range and the hardness (Shore C) between 25 and 60, the chemical foaming blend basically includes a thermoplastic material, an ion exchange resin, a phase change material, a foaming agent and a crosslinking agent. The chemical foaming blend is made by mixing the thermoplastic material, the ion exchange resin, the phase change material, the foaming agent and the crosslinking agent together.

[0015] The thermoplastic material is selected from one or more of the group consisting of polyethylene (PE), ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (TPO), styrene copolymer elastomer (TPS), polyurethane elastomer (TPU), polyester elastomer (TPEE), polyamide elastomer (TPEA), synthetic rubber, and natural rubber. This indicates that the thermoplastic material can be used alone or in combination with two or more of the same material. In this embodiment, the thermoplastic material, the ion exchange resin, and the phase change material constitute an ion exchange resin mixture, and the content of the thermoplastic material, by weight, accounts for 60wt% to 95wt% of the total content of the ion exchange resin mixture. The thermoplastic material is selected from polyethylene (PE), ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (TPO), styrene copolymer elastomer (TPS), polyurethane elastomer (TPU), polyester elastomer (TPEE), polyamide elastomer (TPEA), synthetic rubber, and natural rubber. When any two or more of the following are combined: thermoplastic materials (including rubber) and natural rubber, the content ratio of these thermoplastic materials can be adjusted according to the product performance requirements.

[0016] The ionomer resin is mixed with the thermoplastic material. The ionomer resin is formed by the neutralization reaction of an acidic resin and a metal stearate salt. Some carboxylic acid groups or some anhydride groups of the acidic resin neutralize the metal ions of the metal stearate salt, causing partial ionic bonding in the acidic resin to form the ionomer resin. The acidic resin is selected from polyethylene methacrylate copolymer resin (EMAA), polyethylene acrylic copolymer resin (EAA), and polyacrylic acid copolymer resin (PAA). The acidic resin is composed of one or more of the group consisting of copolymers and maleic anhydride graft polymers, and the content of carboxylic acid groups or anhydride groups in the acidic resin is less than 20 wt%. In this embodiment, the stearate metal salt is selected from one or more of the group consisting of zinc stearate, magnesium stearate, sodium stearate, calcium stearate and lithium stearate. That is, the stearate metal salt can be used alone or in combination of two or more. More preferably, the metal ion of the stearate metal salt can be selected from one of the group consisting of alkali metals or alkaline earths. That is, the metal ion of the stearate metal salt is one of the alkali metals or alkaline earths. For example, the stearate metal salt can be magnesium stearate, sodium stearate, calcium stearate and lithium stearate. In this embodiment, the thermoplastic material, the acidic resin, and the metal stearate form an acidic resin mixture. The content of the thermoplastic material, by weight, accounts for 60wt% to 95wt% of the total content of the acidic resin mixture. The combined content of the acidic resin and the metal stearate, by weight, accounts for 5wt% to 40wt% of the total content of the acidic resin mixture. The weight ratio of the acidic resin to the metal stearate is 65:35 to 97:3. In other embodiments, the combined content of the thermoplastic material, the acidic resin, and the metal stearate is 100 phr. The foaming agent and the crosslinking agent are then added to form the chemical foaming blend. Other additives, such as anti-shrinkage agents and zinc oxide, may be added separately.

[0017] The phase change material (PCM) is mixed with the thermoplastic material. The PCM is stearic acid. The PCM is generated by the neutralization reaction of stearic acid metal salt and acidic resin, which causes the metal ions of stearic acid metal salt to dissociate and form stearic acid. The combined content of the ion exchange resin and the PCM, by weight, accounts for 5wt% to 40wt% of the total content of the ion exchange resin mixture, and the weight ratio of the ion exchange resin to the PCM is 67:33 to 98:2. During the neutralization reaction between the stearic acid metal salt and the acidic resin, the stearic acid metal salt loses metal ions and takes on hydrogen ions to form stearic acid. This results in a slight decrease in the weight of the stearic acid generated compared to the weight of the stearic acid metal salt. During the reaction, the acidic resin accepts the metal ions of the stearic acid metal salt to form the ion exchange resin, thus the weight of the ion exchange resin generated is slightly increased compared to the weight of the acidic resin.

[0018] Specifically, this phase change material is based on the ability of a material to absorb or release latent heat when it undergoes a physical phase change within a specific temperature range. Simply put, when the chemically foamed blend is heated at high temperatures, the phase change material transforms from a solid phase to a molten phase to generate an endothermic reaction and store thermal energy. When the chemically foamed blend is cooled, the phase change material solidifies and releases the stored thermal energy. In this embodiment, the phase change material's transition temperature is between 45°C and 130°C.

[0019] The foaming agent is a chemical foaming agent. It is uniformly mixed with the thermoplastic material, the ionomer resin, and the phase change material. During high-temperature processing, the foaming agent decomposes due to heat, releasing one or more gases, such as nitrogen or carbon dioxide, causing the molten thermoplastic material to expand and foam. The amount of foaming agent added is based on the total content of the thermoplastic material, the ionomer resin, and the phase change material, and the amount can be adjusted according to product performance requirements. In this embodiment, the amount of foaming agent added is between 2 and 25 phr, which is sufficient to allow the thermoplastic material to foam uniformly. In a preferred embodiment, the types of foaming agents include azo foaming agents for generating N2, ammonium compounds for generating NH3, and mixtures of carbonates and acids for generating CO2, such as sodium bicarbonate, dinitrosopeptide, sulfonyl hydroxide, azodicarbonamide, p-toluenesulfonylaminourea, 5-phenyltetrazole, diisopropylazidodicarboxylate, and sodium borohydride, etc., and are not limited thereto.

[0020] The crosslinking agent is mixed with the thermoplastic material, the ion exchange resin, and the phase change material. The amount of crosslinking agent added is based on the total content of the thermoplastic material, the ion exchange resin, and the phase change material. The amount of crosslinking agent added is between 0.3 and 1.2 phr. The crosslinking agent is selected from 1,1'-bis-(tert-butyl-peroxy)-3,3,5-trimethylcyclohexane (TMCH), tert-butylperoxy-2-ethylhexyl carbonate (TBEC), and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane. One or more combinations of the group consisting of hexane (DBPH), di(tert-butylperoxyisopropyl)benzene (BIPB), benzoylperoxide (BPO), and dicumyl peroxide (DCP).

[0021] It is worth noting that the unit "phr" (parts per hundred resin) used in this article, unless otherwise specified, refers to the weight of additional additives added based on the total content of the thermoplastic material, the acid resin, and the metal stearate per 100 combined parts by weight; or the weight of additional additives added based on the total content of the thermoplastic material, the ion exchange resin, and the phase change material per 100 combined parts by weight.

[0022] Therefore, the chemical foaming blend is generated by the neutralization reaction between the acidic resin and the stearic acid metal salt to produce the ion exchange resin and the phase change material. The ion exchange resin can enhance the physical strength of the finished foamed component and achieve the effect of lightweighting the finished foamed component. The phase change material is generated by the reaction between the stearic acid metal salt and the acidic resin. Thus, the chemical foaming blend does not contain any additional phase change materials. Furthermore, the phase change material generated in the chemical foaming blend can shorten the cooling and shrinkage time of the foaming process and save energy consumption in the process.

[0023] Please also refer to Figure 1Another embodiment of the present invention provides a method for producing a finished foamed component from a chemical foaming blend containing a phase change material generated by a reaction, which includes the types and contents of the thermoplastic material, the acidic resin, the metal stearate, the foaming agent, and the crosslinking agent in the chemical foaming blend of the above embodiments. The method for producing a finished foamed component from the chemical foaming blend includes the following steps:

[0024] Step S1 involves mixing the thermoplastic material, the acidic resin, the metal stearate, the foaming agent, and the crosslinking agent to form the chemically foamed blend. The acidic resin and the metal stearate undergo a neutralization reaction to generate the ionomer resin, thus partially bonding the acidic resin. The metal stearate reacts with the acidic resin to generate the phase change material, stearic acid. More specifically, in step S1, the thermoplastic material, the acidic resin, the metal stearate, the foaming agent, and the crosslinking agent are batch-mixed. First, the thermoplastic material is fed into a mixing machine at a speed of 60... The mixture is stirred at 85℃. Then, the stearic acid metal salt and the thermoplastic material are added to the mixing machine and stirred. The stearic acid metal salt can be added to the mixing machine with other additives, such as anti-shrinkage agent and zinc oxide. Then, the acidic resin is added to the mixing machine and stirred for 10 to 20 minutes. During the stirring process, some of the carboxylic acid groups or some of the anhydride groups of the acidic resin react with the metal ions of the stearic acid metal salt to generate the ion exchange resin and the phase change material. Then, the crosslinking agent and the foaming agent are added to the mixing machine and stirred to obtain the chemically foamed blend.

[0025] Step S2: The chemical foaming blend is filled into a mold and heated to perform foaming and bridging reactions, forming a semi-finished foamed component. When the chemical foaming blend is filled into the mold, the heating temperature of the mold is between 160°C and 185°C, and the heating time is 6 to 18 minutes. The phase change material stores thermal energy during the heated foaming process of the chemical foaming blend. In a preferred embodiment, the chemical foaming blend is melted at high temperature and high pressure using an injection molding machine to form a fluid state. The injection molding machine injects the molten chemical foaming blend into the mold and heats it in the mold to perform foaming and bridging reactions. At this time, the foaming agent in the chemical foaming blend generates gas due to heating, causing the chemical foaming blend to expand and foam into the semi-finished foamed component.

[0026] Step S3: Remove the semi-finished foamed component from the mold and place it in a molding environment. The temperature of the molding environment is not higher than the phase change temperature of the phase change material. The phase change material releases its stored heat energy in the molding environment, causing the semi-finished foamed component to shrink and form a finished foamed component. After the semi-finished foamed component is removed from the mold, it is first placed in the molding environment to cool and shrink. The temperature of the molding environment is set to 30℃~45℃, and the cooling and shrinking time is between 15~45 minutes to simulate indoor weather changes. The ambient temperature of the molding environment, and the cooling shrinkage time and temperature conditions of the molding environment can be adjusted according to the needs of the foamed component semi-finished product. Because the temperature of the molding environment is set below the transformation temperature of the phase change material, the phase change material in the foamed component semi-finished product releases the stored heat energy, allowing the foamed component semi-finished product to maintain a certain temperature. This ensures that the foamed component semi-finished product has uniform thermal shrinkage after mold opening, enabling the foamed component semi-finished product to be stably molded into the finished foamed component in the molding environment. The finished foamed component has a density between 0.05 and 0.20 g / cm³. 3 The specific gravity range is within the range of 25 to 60, and the hardness (Shore C) is between 25 and 60.

[0027] In summary, the method for producing a finished foamed component from the chemical foaming blend described in the foregoing embodiments uses the chemical foaming blend. In the steps of this method, the chemical foaming blend is made by mixing the thermoplastic material, the acidic resin, the metal stearate, the foaming agent, and the crosslinking agent. During the mixing process, some of the carboxylic acid groups or some of the anhydride groups of the acidic resin undergo a neutralization reaction with the metal ions of the metal stearate to generate the ion exchange resin and the phase change material. When the chemical foaming compound is heated and foamed in the mold, the phase change material can store heat energy during the heated foaming process. After the foamed component semi-finished product is taken out of the mold, it is placed in the molding environment. Because the temperature of the molding environment is set lower than the transformation temperature of the phase change material, it can be placed in an indoor environment and can be stably molded at room temperature. This allows the phase change material in the foamed component semi-finished product to release the stored heat energy, keeping the foamed component semi-finished product at a certain temperature. There is no need for additional temperature control of the room temperature, nor is it necessary to use an oven, thus saving the cost of using an oven. It also allows the foamed component semi-finished product to have uniform thermal shrinkage after mold opening, thereby shortening the cooling shrinkage time in the process and improving the shrinkage yield. In addition, the ion exchange resin can enhance the physical strength of the foamed component finished product and achieve the effect of lightweighting the foamed component finished product.

[0028] Furthermore, to fully understand the purpose, features, and effects of the present invention, the following embodiments provide that the chemical foaming blends of various experimental groups are neutralized by different acidic resins and stearic acid metal salts to generate ion exchange resins and phase change materials, and the chemical foaming blends are then made into finished foamed shoe bodies. The finished foamed shoe bodies of each experimental group are subjected to corresponding mechanical performance tests. It should be noted that the following embodiments are finished foamed shoe bodies, which can be shoe midsoles or outsoles. However, the scope of the present invention is not limited to finished foamed shoe bodies; in other embodiments, finished foamed components such as foamed protective gear and foamed padding are also within the scope of the present invention.

[0029] I. To explore the mechanical properties of the foamed shoe bodies produced by using different stearic acid metal salts in each experimental group:

[0030] (a) Preparation of chemical foaming blends for the control group and experimental groups 1-5:

[0031] Control group: The thermoplastic material, acidic resin, foaming agent, crosslinking agent, zinc oxide, and anti-shrinkage agent were mixed to form the chemically foamed blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 20 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the foaming agent was a 13.5 phr azo foaming agent, and the crosslinking agent was a 0.6 phr peroxide crosslinking agent. In this control group, the amount (phr) of the foaming agent and the crosslinking agent added was based on the total content of the thermoplastic material and the acidic resin per 100 parts by weight of the mixture, plus additional parts by weight. One part by weight of stearic acid was added during the mixing process as a phase change material in the chemically foamed blend.

[0032] Experimental Group 1: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 17.3 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the stearic acid metal salt was 2.7 parts by weight of magnesium stearate (MgSt2), the foaming agent was an azo foaming agent with a concentration of 12.6 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.5 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 2.57 parts by weight of stearic acid.

[0033] Experimental Group 2: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 17.3 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the stearic acid metal salt was 2.7 parts by weight of calcium stearate (CaSt2), the foaming agent was an azo foaming agent with a concentration of 12.6 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.5 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 2.56 parts by weight of stearic acid.

[0034] Experimental Group 3: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 17.4 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the stearic acid metal salt was 2.6 parts by weight of lithium stearate (LiSt), the foaming agent was an azo foaming agent with a concentration of 11.6 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.5 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 2.58 parts by weight of stearic acid.

[0035] Experimental Group 4: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 17.2 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the stearic acid metal salt was 2.8 parts by weight of sodium stearate (NaSt), the foaming agent was an azo foaming agent with a concentration of 12.1 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.5 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 2.56 parts by weight of stearic acid.

[0036] Experimental Group 5: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 17.2 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the stearic acid metal salt was 2.8 parts by weight of zinc stearate (ZnSt2), the foaming agent was an azo foaming agent with a concentration of 12.1 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.5 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 2.55 parts by weight of stearic acid.

[0037] In this experiment, the amount of zinc oxide added to the chemical foaming blends of the control group and experimental groups 1-5 was 2 phr, and the amount of anti-shrinkage agent added was 3 phr. Furthermore, experimental groups 1-5 did not contain any additional stearic acid. The composition and content of the control group and experimental groups 1-5 are shown in Table 1 below.

[0038] Table 1 shows the chemical foaming compound composition of the control group and experimental groups 1-5.

[0039]

[0040] As shown in Table 1 above, the chemical foaming blends in experimental groups 1-5 were mixed with different types of stearic acid metal salts and polyethylene methacrylate copolymer resin (EMAA). Each stearic acid metal salt could react with the EMAA to generate stearic acid, indicating that the chemical foaming blends in experimental groups 1-5 had the ability to react with the EMAA to form the ionomer resin. The chemical foaming blends in the control group did not contain stearic acid metal salts during the mixing process, thus the chemical foaming blends did not contain stearic acid and the ionomer resin generated by the reaction of the acidic resin and the stearic acid metal salts.

[0041] (II) Testing the mechanical properties of the foamed shoe bodies made from the control group and each of the experimental groups 1-5:

[0042] In this experiment, the chemical foaming admixtures of the control group and each of the experimental groups 1-5 were respectively processed into foamed shoe bodies using the method described in the aforementioned embodiment. The cooling and shrinkage conditions of the foamed shoe bodies of the control group and each of the experimental groups 1-5 in the molding environment were 45℃-40℃, with a total cooling and shrinkage time of 20 minutes. The foaming density of the foamed shoe bodies of the control group and each of the experimental groups 1-5 was set to 0.12±0.02 g / cm³. 3 The hardness was 45±3C. The control group and the finished foamed shoe bodies of each of the experimental groups 1-5 were subjected to mechanical property tests related to the foamed midsole / outsole, including hardness (C), elasticity test, compression deformation, density test, tear strength, tensile strength, and elongation. The mechanical property test results of the control group and the finished foamed shoe bodies of each of the experimental groups 1-5 are shown in Table 2 below.

[0043] Table 2 shows the mechanical properties of the foamed shoe bodies from the control group and experimental groups 1-5.

[0044]

[0045] As shown in Table 2 above, the foamed shoe bodies of the control group and each of the experimental groups 1-5 can complete the shrinkage molding process in a molding environment of 45℃-40℃, and the density of the foamed shoe bodies of the control group and each of the experimental groups 1-5 is between 0.12±0.02g / cm³. 3 The hardness was 45±3C, indicating that the stearic acid generated by the reaction of the stearic acid metal salt and the polyethylene methacrylate copolymer resin (EMAA) in the foamed shoe body products of each of the experimental groups 1 to 5 can indeed serve as a phase change material, providing the effect of shortening the molding cooling time and lightweighting the foamed shoe body products. In addition, the tear strength (N / mm) and tear strength (N / cm) measured in each of the experimental groups 1 to 5 were not less than those measured in the control group. Moreover, the elongation measured in experimental group 1 was significantly greater than that measured in experimental groups 2 to 5. This indicates that the chemical foaming blends in each of the experimental groups 1 to 5 contain the ion exchange resin formed by the reaction of the polyethylene methacrylate copolymer resin (EMAA) and the stearic acid metal salt, which can enhance the tear strength of the foamed shoe body products. Furthermore, the ion exchange resin generated by the reaction of magnesium stearate and the acidic resin in experimental group 1 makes the foamed shoe body products more elastic.

[0046] II. To explore the mechanical properties of the foamed shoe bodies corresponding to different contents of stearic acid metal salts in each experimental group:

[0047] (a) Preparation of chemical foaming blends for experimental groups 6-12:

[0048] Experimental Group 6: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 18.3 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the stearic acid metal salt was 1.7 parts by weight of magnesium stearate (MgSt2), the foaming agent was an azo foaming agent with a concentration of 11.2 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.5 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 1.63 parts by weight of stearic acid.

[0049] Experimental Group 7: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 16.4 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the stearic acid metal salt was 3.6 parts by weight of magnesium stearate (MgSt2), the foaming agent was an azo foaming agent with a concentration of 12.1 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.55 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 3.42 parts by weight of stearic acid.

[0050] Experimental Group 8: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 18.2 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the stearic acid metal salt was 1.8 parts by weight of sodium stearate (NaSt), the foaming agent was an azo foaming agent with a concentration of 12.1 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.55 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 1.63 parts by weight of stearic acid.

[0051] Experimental Group 9: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 16.3 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the stearic acid metal salt was 3.7 parts by weight of sodium stearate (NaSt), the foaming agent was an azo foaming agent with a concentration of 12.1 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.55 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 3.4 parts by weight of stearic acid.

[0052] Experimental Group 10: The thermoplastic material, the acidic resin, the stearate metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 17.3 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the stearate metal salt was a combination of 1.3 parts by weight of magnesium stearate (MgSt2) and 1.4 parts by weight of sodium stearate (NaSt), the foaming agent was an azo foaming agent with a concentration of 11.3 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.5 phr. The acidic resin and the stearate metal salt were neutralized to produce 2.57 parts by weight of stearic acid.

[0053] Experimental Group 11: The thermoplastic material, the acidic resin, the stearate metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 17.8 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the stearate metal salt was a combination of 1.3 parts by weight of magnesium stearate (MgSt2) and 0.9 parts by weight of sodium stearate (NaSt), the foaming agent was an azo foaming agent with a concentration of 11.6 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.55 phr. The acidic resin and the stearate metal salt were neutralized to produce 2.11 parts by weight of stearic acid.

[0054] Experimental Group 12: The thermoplastic material, the acidic resin, the stearate metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 17.3 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the stearate metal salt was a combination of 1.3 parts by weight of magnesium stearate (MgSt2) and 1.4 parts by weight of zinc stearate (ZnSt2), the foaming agent was an 11 phr azo foaming agent, and the crosslinking agent was a 0.5 phr peroxide crosslinking agent. The acidic resin and the stearate metal salt were neutralized to produce 2.57 parts by weight of stearic acid.

[0055] In this experiment, the amount of zinc oxide added in the chemical foaming blends of experimental groups 6-12 was 2 phr, and the amount of anti-shrinkage agent added was 3 phr. Furthermore, none of the blends in experimental groups 6-12 contained any additional stearic acid. The composition and content of experimental groups 6-12 are shown in Table 3 below.

[0056] Table 3 shows the composition of the chemical foaming admixtures in experimental groups 6-12.

[0057]

[0058] As shown in Table 3 above, the chemical foaming blends contain varying amounts of stearic acid metal salts mixed with polyethylene methacrylate copolymer resin (EMAA), or a combination of two stearic acid metal salts mixed with EMAA. In all experimental groups 6-12, each stearic acid metal salt can undergo a neutralization reaction with EMAA to generate stearic acid. This indicates that the chemical foaming blends in experimental groups 6-12 have the ability to react with EMAA and various stearic acid metal salts to form the ion exchange resin.

[0059] (II) Testing the mechanical properties of the foamed shoe bodies produced from experimental groups 6-12:

[0060] In this experiment, the chemical foaming blends of experimental groups 6-12 were respectively processed into foamed shoe bodies using the method described in the aforementioned embodiment. The cooling and shrinkage conditions of the foamed shoe bodies of experimental groups 6-12 in the molding environment were 45℃-40℃, with a total cooling and shrinkage time of 20 minutes. The foaming density of the foamed shoe bodies of experimental groups 6-12 was set to 0.12±0.02 g / cm³. 3 The finished foamed shoe bodies from each experimental group (6-12) were subjected to mechanical property tests related to the foamed midsole / outsole, including hardness (C), elasticity test, compression deformation, density test, tear strength, tensile strength, and elongation. The mechanical property test results of the finished foamed shoe bodies from each experimental group (6-12) are shown in Table 4 below:

[0061] Table 4 shows the mechanical properties of the foamed shoe bodies in experimental groups 6-12.

[0062]

[0063] As shown in Table 4 above, the foamed shoe bodies of experimental groups 6-12 can all complete the shrinkage molding process in a molding environment of 45℃-40℃, and the density of the foamed shoe bodies of experimental groups 6-12 is all between 0.12±0.02g / cm³. 3The tear strength (N / mm) and tear strength (N / cm) measured in experimental groups 6-8 and 10-12 were greater than those measured in the control group. Furthermore, the elongation measured in experimental group 12 was greater than that in experimental groups 6-11. This indicates that the stearic acid metal salt was produced by reacting magnesium stearate, sodium stearate, a combination of magnesium stearate and sodium stearate, and a combination of magnesium stearate and zinc stearate with polyethylene methacrylate copolymer resin (EMAA). Ion exchange resins can effectively improve the physical strength of the foamed shoe body. Specifically, the ion exchange resin generated by reacting magnesium stearate and zinc stearate with the acidic resin in experimental group 12 can further enhance the physical strength of the foamed shoe body and maintain better elasticity. The tear strength (N / mm) and tear strength (N / cm) measured in experimental group 9 are lower than those in the control group, indicating that the increased sodium stearate content in experimental group 9 relatively reduces the physical strength of the foamed shoe body.

[0064] III. To explore the mechanical properties of the foamed shoe bodies produced using different acidic resins in each experimental group:

[0065] (a) Preparation of chemical foaming blends for experimental groups 13-17:

[0066] Experimental Group 13: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 17.3 parts by weight of polyethylene methacrylate copolymer resin (EMAA), the stearic acid metal salt was 2.7 parts by weight of magnesium stearate (MgSt2), the foaming agent was an azo foaming agent with a concentration of 11.7 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.55 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 2.57 parts by weight of stearic acid.

[0067] Experimental Group 14: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 86 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 11.3 parts by weight of polyethylene acrylic copolymer resin (EAA), the stearic acid metal salt was 2.7 parts by weight of magnesium stearate (MgSt2), the foaming agent was an azo foaming agent with 11 phr, and the crosslinking agent was a peroxide crosslinking agent with 0.65 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 2.64 parts by weight of stearic acid.

[0068] Experimental Group 15: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 80 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 18.7 parts by weight of ethylene-vinyl acetate grafted maleic anhydride (EVA-MAH), the stearic acid metal salt was 1.3 parts by weight of magnesium stearate (MgSt2), the foaming agent was an azo foaming agent with a concentration of 12.2 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.5 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 1.25 parts by weight of stearic acid.

[0069] Experimental Group 16: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 70 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was 27 parts by weight of ethylene-propylene rubber copolymer grafted with maleic anhydride (EPDM-MAH), the stearic acid metal salt was 3.0 parts by weight of magnesium stearate (MgSt2), the foaming agent was an azo foaming agent with a concentration of 13.8 phr, and the crosslinking agent was a peroxide crosslinking agent with a concentration of 0.6 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 1.28 parts by weight of stearic acid.

[0070] Experimental Group 17: The thermoplastic material, the acidic resin, the stearate metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was 86 parts by weight of ethylene-vinyl acetate copolymer (EVA), the acidic resin was a combination of 17.3 parts by weight of polyethylene methacrylate copolymer resin (EMAA) and 9.35 parts by weight of ethylene vinyl acetate grafted maleic anhydride (EVA-MAH), the stearate metal salt was 3.35 parts by weight of magnesium stearate (MgSt2), the foaming agent was a 12 phr azo foaming agent, and the crosslinking agent was a 0.55 phr peroxide crosslinking agent. The acidic resin and the stearate metal salt were neutralized to produce 3.2 parts by weight of stearic acid.

[0071] In this experiment, the amount of zinc oxide added in the chemical foaming blends of experimental groups 13-17 was 2 phr, and the amount of anti-shrinkage agent added was 3 phr. Furthermore, none of the experimental groups 13-17 contained any additional stearic acid. The composition and content of experimental groups 13-17 are shown in Table 5 below.

[0072] Table 5 shows the composition of the chemical foaming admixtures in experimental groups 13-17.

[0073]

[0074] As shown in Table 5 above, the chemical foaming blends contain different types of acidic resins selected in experimental groups 13-17, and the content of magnesium stearate (MgSt2) was adjusted accordingly during mixing. In experimental groups 13-17, the magnesium stearate can react with different types of acidic resins to generate stearic acid, indicating that the chemical foaming blends in experimental groups 13-17 contain the ion exchange resin formed by the reaction of each acidic resin with magnesium stearate.

[0075] (II) Testing the mechanical properties of the foamed shoe bodies produced from experimental groups 13-17:

[0076] In this experiment, the chemical foaming blends of experimental groups 13-17 were respectively processed into foamed shoe bodies using the method described in the aforementioned embodiments. The cooling and shrinkage conditions of the foamed shoe bodies of experimental groups 13-17 in the molding environment were 45℃-40℃, with a total cooling and shrinkage time of 20 minutes. The foaming density of the foamed shoe bodies of experimental groups 13-17 was set to 0.12±0.02 g / cm³. 3 The finished foamed shoe bodies from experimental groups 13-17 were subjected to mechanical property tests related to the foamed midsole / outsole, including hardness (C), elasticity test, compression deformation, density test, tear strength, tensile strength, and elongation. The mechanical property test results of the finished foamed shoe bodies from experimental groups 13-17 are shown in Table 6 below:

[0077] Table 6 shows the mechanical properties of the foamed shoe bodies from experimental groups 13 to 17.

[0078]

[0079] As shown in Table 6 above, the foamed shoe bodies of experimental groups 13-17 can all complete shrinkage molding in a molding environment of 45℃-40℃, and the density of the foamed shoe bodies of experimental groups 13-17 is all between 0.12±0.02g / cm³. 3 The tear strength (N / mm) and tear strength (N / cm) measured in experimental groups 13-15 and 17 were all greater than those measured in the control group. The tear strength (N / mm) and tear strength (N / cm) measured in experimental groups 13 and 14 were better. The elongation measured in experimental group 13 was also greater than that in experimental groups 14-17. In experimental groups 13 and 14, the acidic resin used was the ion exchange resin generated by reacting polyethylene methacrylate copolymer resin (EMAA) and polyethylene acrylate copolymer resin (EAA) with magnesium stearate, which can further enhance the physical strength of the foamed shoe body. The foamed shoe body of experimental group 13 also has better elasticity.

[0080] IV. To explore the mechanical properties of the foamed shoe bodies produced by using different contents of stearic acid metal salts and different combinations of thermoplastic materials in each experimental group:

[0081] (a) Preparation of chemical foaming blends for experimental groups 18-22:

[0082] Experimental Group 18: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material consisted of 60 parts by weight of ethylene-vinyl acetate copolymer (EVA) and 20 parts by weight of polyolefin elastomer (TPO). The acidic resin consisted of 17.3 parts by weight of polyethylene methacrylate copolymer resin (EMAA). The stearic acid metal salt consisted of 2.7 parts by weight of magnesium stearate (MgSt2). The foaming agent was an azo foaming agent with a concentration of 11.4 phr. The crosslinking agent was a peroxide crosslinking agent with a concentration of 0.55 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 2.57 parts by weight of stearic acid.

[0083] Experimental Group 19: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material consisted of 65 parts by weight of ethylene-vinyl acetate copolymer (EVA) and 20 parts by weight of polyolefin elastomer (TPO). The acidic resin consisted of 13.0 parts by weight of polyethylene methacrylate copolymer resin (EMAA). The stearic acid metal salt consisted of 2.0 parts by weight of magnesium stearate (MgSt2). The foaming agent was an azo foaming agent with a concentration of 11.6 phr. The crosslinking agent was a peroxide crosslinking agent with a concentration of 0.6 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 1.93 parts by weight of stearic acid.

[0084] Experimental Group 20: The thermoplastic material, the acidic resin, the metal stearate, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was a combination of 66 parts by weight of ethylene-vinyl acetate copolymer (EVA) and 20 parts by weight of polyolefin elastomer (TPO). The acidic resin was 11.3 parts by weight of polyethylene acrylic copolymer resin (EAA). The metal stearate was 2.7 parts by weight of magnesium stearate (MgSt2). The foaming agent was an azo foaming agent with a concentration of 12 phr. The crosslinking agent was a peroxide crosslinking agent with a concentration of 0.65 phr. The acidic resin and the metal stearate were neutralized to produce 2.64 parts by weight of stearic acid.

[0085] Experimental Group 21: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was a combination of 45 parts by weight of ethylene-vinyl acetate copolymer (EVA), 10 parts by weight of polyolefin elastomer (TPO), 15 parts by weight of styrene-ethylene / diene block copolymer (SEBS), and 15 parts by weight of styrene block copolymer (SBC). The acidic resin was 13.5 parts by weight of ethylene-propylene rubber copolymer grafted with maleic anhydride (EPDM-MAH). The stearic acid metal salt was 1.5 parts by weight of magnesium stearate (MgSt2). The foaming agent was an azo foaming agent with a concentration of 14.4 phr. The crosslinking agent was a peroxide crosslinking agent with a concentration of 0.6 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 0.64 parts by weight of stearic acid.

[0086] Experimental Group 22: The thermoplastic material, the acidic resin, the stearic acid metal salt, the foaming agent, the crosslinking agent, zinc oxide, and the anti-shrinkage agent were mixed to form the chemical foaming blend. The thermoplastic material was a combination of 50 parts by weight of ethylene-vinyl acetate copolymer (EVA) and 20 parts by weight of polyolefin elastomer (TPO). The acidic resin was 26 parts by weight of polyethylene methacrylate copolymer resin (EMAA). The stearic acid metal salt was 4.0 parts by weight of magnesium stearate (MgSt2). The foaming agent was an azo foaming agent with a concentration of 16 phr. The crosslinking agent was a peroxide crosslinking agent with a concentration of 0.65 phr. The acidic resin and the stearic acid metal salt were neutralized to produce 3.86 parts by weight of stearic acid.

[0087] In this experiment, the amount of zinc oxide added to the chemical foaming blends of experimental groups 18-22 was 2 phr, and the amount of anti-shrinkage agent added was 3 phr. Furthermore, none of the blends in experimental groups 18-22 contained any additional stearic acid. The composition and content of experimental groups 18-22 are shown in Table 7 below.

[0088] Table 7 shows the composition of the chemical foaming blends in experimental groups 18-22.

[0089]

[0090] As shown in Table 7 above, the chemical foaming blends contain different types of acidic resins selected for experimental groups 18-22, and the content of magnesium stearate (MgSt2) was adjusted during the mixing process. In addition, at least one of polyolefin elastomer (TPO), styrene-ethylene / diene block copolymer (SEBS), and styrene block copolymer (SBC) was added to experimental groups 18-22 and combined with ethylene-vinyl acetate copolymer (EVA). In experimental groups 18-22, the stearate metal salt can react with the acidic resin to generate stearic acid, indicating that the chemical foaming blends of experimental groups 18-22 have the ability to react with the acidic resin and the stearate metal salt to form the ion exchange resin.

[0091] (II) Testing the mechanical properties of the foamed shoe bodies made from samples 18-22 of each experimental group:

[0092] In this experiment, the chemical foaming blends of experimental groups 18-22 were respectively made into foamed shoe bodies using the method described in the aforementioned embodiments. The cooling and shrinkage conditions of the foamed shoe bodies of experimental groups 18-22 in the molding environment were 45℃-40℃, and the total cooling and shrinkage time was 20 minutes. The foamed shoe bodies of experimental groups 18-22 were then subjected to mechanical property tests related to the foamed midsole / outsole, including hardness (C), elasticity test, compression set, density test, tear strength, tensile strength, and elongation. The mechanical property test results of the foamed shoe bodies of experimental groups 18-22 are shown in Table 8 below.

[0093] Table 8 shows the mechanical properties of the foamed shoe bodies from experimental group 18 to 22.

[0094]

[0095] As shown in Table 8 above, the foamed shoe bodies of experimental groups 18-22 can all complete shrinkage molding in a molding environment of 45℃-40℃, and the density of the foamed shoe bodies of experimental groups 18-22 ranges from 0.09 to 0.15 g / cm³. 3The tear strength (N / mm) and tear strength (N / cm) measured in experimental groups 18-20 were greater than those measured in the control group. Furthermore, the elongation measured in experimental groups 18-20 was greater than that in experimental groups 21 and 22. This indicates that adding other thermoplastic resins to the chemical foaming blend in combination with the ethylene-vinyl acetate copolymer (EVA) does not affect the physical strength of the finished foamed shoe body. Moreover, in experimental groups 18-20, the acidic resins selected were polyethylene methacrylate copolymer resin (EMAA) and polyethylene acrylic copolymer resin (EAA), and the magnesium stearate content was between 2 and 2.7 parts by weight. These conditions effectively enhanced the physical strength of the finished foamed shoe body and maintained its elasticity.

[0096] In summary, the chemical foaming blends in experimental groups 1-22 were made by mixing different types of acidic resins and stearic acid metal salts, with appropriate adjustments to the content of the acidic resins and stearic acid metal salts. The acidic resins and stearic acid metal salts could both generate ionomer resins and phase change materials through neutralization reactions. Furthermore, the mechanical properties of the foamed shoe bodies from experimental groups 1-22 confirmed that the reaction between the acidic resin and stearic acid metal salts to generate ionomer resins provides the foamed shoe bodies with low density and lightweight characteristics, effectively enhances the tear strength of the foamed shoe bodies, and maintains better elasticity. The presence of stearic acid, generated from the reaction of each stearic acid metal salt with the acidic resin, in the foamed shoe bodies also serves as a phase change material, effectively shortening the molding and cooling time of the foamed shoe bodies.

[0097] The above description is only a preferred embodiment of the present invention. Any equivalent changes made by applying the scope of the present invention and the claims should be included within the protection scope of the present invention.

Claims

1. A chemical foaming blend comprising a phase change material generated by a reaction, used for foaming to form a finished foamed component, the finished foamed component being used as part of a sporting good, wherein the chemical foaming blend comprising the phase change material generated by the reaction comprises: A thermoplastic material; An ionomer resin is mixed with the thermoplastic material, wherein the ionomer resin is generated by a neutralization reaction between an acidic resin and a metal stearate salt; A phase change material is mixed with the thermoplastic material, wherein the phase change material is stearic acid, which is generated by reacting the metal salt of stearic acid with the acidic resin; A foaming agent, mixed with the thermoplastic material, the ion exchange resin, and the phase change material; and A bridging agent is mixed with the thermoplastic material, the ion exchange resin, and the phase change material; in, The finished foamed component has a density between 0.05 and 0.20 g / cm³. 3 The specific gravity range, and the hardness Shore C is between 25 and 60.

2. The chemical foaming blend containing the phase change material generated by the reaction according to claim 1, wherein the thermoplastic material, the ion exchange resin and the phase change material constitute an ion exchange resin mixture, wherein the content of the thermoplastic material, by weight, accounts for 60wt% to 95wt% of the total content of the ion exchange resin mixture, and the combined content of the ion exchange resin and the phase change material, by weight, accounts for 5wt% to 40wt% of the total content of the ion exchange resin mixture.

3. The chemical foaming blend containing the phase change material generated by the reaction according to claim 2, wherein the weight ratio of the ion exchange resin to the phase change material is 67:33 to 98:

2.

4. The chemically foamed blend containing the phase change material generated by the reaction according to claim 3, wherein the thermoplastic material is selected from one or more combinations of the group consisting of polyethylene, ethylene-vinyl acetate copolymer, polyolefin elastomer, styrene copolymer elastomer, polyurethane elastomer, polyester elastomer, polyamide elastomer, synthetic rubber and natural rubber; the acidic resin is selected from one or more combinations of the group consisting of polyethylene methacrylate copolymer resin, polyethylene acrylic acid copolymer resin, polyacrylic acid copolymer resin and maleic anhydride graft polymer, and the content of carboxylic acid groups or anhydride groups of the acidic resin is less than 20 wt%.

5. The chemically foamed blend containing the phase change material generated by the reaction according to claim 4, wherein the stearate metal salt is selected from one or more combinations of the group consisting of zinc stearate, magnesium stearate, sodium stearate, calcium stearate and lithium stearate.

6. The chemically foamed blend containing the phase change material generated by the reaction according to claim 1 or 2, wherein the amount of the crosslinking agent added is between 0.3 phr and 1.2 phr, and the amount of the crosslinking agent added is based on the total content of the thermoplastic material, the ion exchange resin and the phase change material; the amount of the foaming agent added is between 2 phr and 25 phr, and the amount of the foaming agent added is based on the total content of the thermoplastic material, the ion exchange resin and the phase change material.

7. A method for preparing a finished foamed component from a chemical foaming blend containing a phase change material generated by a reaction, comprising the following steps: Step S1: A thermoplastic material, an acidic resin, a metal stearate, a foaming agent, and a crosslinking agent are mixed to form a chemical foaming blend, wherein the acidic resin reacts with the metal stearate to generate an ion exchange resin, thereby forming partial ionic bonds in the acidic resin, and wherein the metal stearate reacts with the acidic resin to generate a phase change material, namely stearic acid. Step S2 involves filling the chemical foaming blend into a mold and heating it to undergo a foaming and cross-linking reaction, forming a semi-finished foamed component. The phase change material stores thermal energy during the heated foaming process of the chemical foaming blend. Step S3: Remove the semi-finished foamed component from the mold and place it in a molding environment. The temperature of the molding environment is not higher than the phase change temperature of the phase change material. The phase change material releases its stored heat energy in the molding environment, causing the semi-finished foamed component to shrink and form a finished foamed component. The finished foamed component is used as part of a sporting good, wherein the finished foamed component has a density between 0.05 and 0.20 g / cm³. 3 The specific gravity range, and the hardness Shore C is between 25 and 60.

8. The method for preparing a foamed component from a chemical foaming blend containing a phase change material generated by a reaction, according to claim 7, wherein in step S1, the thermoplastic material is first fed into a mixer and mixed at 60°C to 85°C; then, the stearic acid metal salt is added to the mixer and mixed with the thermoplastic material; and the acidic resin is added to the mixer and mixed for 10 to 20 minutes. During the mixing process, some of the carboxylic acid groups or some of the anhydride groups of the acidic resin undergo a neutralization reaction with the metal ions of the stearic acid metal salt to generate the ion exchange resin and the phase change material; then, the crosslinking agent and the foaming agent are added to the mixer and mixed to obtain the chemical foaming blend.

9. The method for producing a foamed component from a chemical foaming blend containing a phase change material generated by the reaction, according to claim 8, wherein the thermoplastic material is selected from one or more combinations of the group consisting of polyethylene, ethylene-vinyl acetate copolymer, polyolefin elastomer, styrene copolymer elastomer, polyurethane elastomer, polyester elastomer, polyamide elastomer, synthetic rubber, and natural rubber; the acidic resin is selected from one or more combinations of the group consisting of polyethylene methacrylate copolymer resin, polyethylene acrylic acid copolymer resin, polyacrylic acid copolymer resin, and maleic anhydride graft polymer, and the content of carboxylic acid groups or anhydride groups in the acidic resin is less than 20 wt%.

10. The method for producing a finished foamed component from a chemical foaming blend containing a phase change material generated by the reaction, according to claim 9, wherein the stearate metal salt is selected from one or more combinations of the group consisting of zinc stearate, magnesium stearate, sodium stearate, calcium stearate and lithium stearate.

11. The method for producing a foamed component from a chemical foaming blend containing a phase change material generated by a reaction, according to claim 8, wherein the thermoplastic material, the acidic resin, and the metal stearate constitute an acidic resin mixture, wherein the content of the thermoplastic material, by weight, accounts for 60wt% to 95wt% of the total content of the acidic resin mixture, and the combined content of the acidic resin and the metal stearate, by weight, accounts for 5wt% to 40wt% of the total content of the acidic resin mixture.

12. The method for preparing a finished foamed component from a chemical foaming blend containing a phase change material generated by the reaction, according to claim 11, wherein the weight ratio of the acidic resin to the metal stearate salt is 65:35 to 97:

3.

13. The method for preparing a foamed component from a chemical foaming blend containing a phase change material generated by the reaction according to claim 8, wherein the amount of crosslinking agent added is between 0.3 phr and 1.2 phr, and the amount of crosslinking agent added is based on the total content of the thermoplastic material, the acidic resin, and the metal stearate; the amount of foaming agent added is between 2 phr and 25 phr, and the amount of foaming agent added is based on the total content of the thermoplastic material, the acidic resin, and the metal stearate.

14. The method for producing a finished foamed component from a chemical foaming blend containing a phase change material generated by the reaction according to claim 7, wherein in step S2, when the chemical foaming blend is filled into the mold, the heating temperature of the mold is between 165°C and 180°C, and the heating time is between 6 and 18 minutes.

15. The method for producing a finished foamed component from a chemical foaming blend containing a phase change material generated by a reaction according to claim 7, wherein in step S3, after the semi-finished foamed component is removed from the mold, it is first placed in the molding environment for cooling and shrinkage, the temperature of the molding environment is set to 30°C~45°C, and the cooling and shrinkage time is between 15~45 minutes, the phase change material in the semi-finished foamed component releases the stored heat energy, maintaining uniform thermal shrinkage of the semi-finished foamed component after mold opening, so that the semi-finished foamed component is formed into the finished foamed component in the molding environment.

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