Low-temperature self-setting composition for counter and counter manufacturing method

Abstract

The invention discloses a low-temperature self-setting composition for a counter. The composition is prepared from the following raw materials in parts by weight: 30 to 80 parts of ethylene-methyl acrylate copolymer, 5 to 50 parts of styrene-ethylene-butylene-styrene block copolymer, 5 to 15 parts of polylaurolactam and 0.01 to 5 parts of mixed solvent, the invention further discloses a manufacturing method of the counter. The manufacturing method comprises the following steps: 1) stirring and extruding; 2) cutting and screening; (3) pre-baking the materials; 4) performing hot melting on the materials; 5) molding and cooling; 6) edge trimming. The composition provided by the invention has high flexibility and wear resistance, is not easy to break, and has the characteristics that after low-temperature heating, the composition is easy to mold and shape, and the shape after shaping is not easy to rebound; according to the manufacturing method, labor, time and processing cost can be saved, the processing efficiency can be improved, energy consumption can be effectively reduced, and the counter manufactured through the method can effectively simplify the shoemaking technological process and reduce the labor cost of the shoemaking technology.

Description

Technical Field

[0001] This invention relates to the technical field of shoe materials, specifically to a low-temperature self-shaping composition for heel counters and a method for manufacturing heel counters. Background Technology

[0002] A heel counter is an auxiliary component used at the heel or underside of a shoe to secure it. Traditional heel counters are generally made of TPEE / TPU. These materials are relatively hard and heavy. In the shoe manufacturing process, the raw material is typically cut into slices using a die, then thinned, and finally shaped using a hot and cold setting machine before being assembled onto the shoe upper. This means that manual operation is required for both the "cutting / thinning" and "shaping" processes, with an estimated 2 x 0.3 people per production line for the "cutting / thinning" step. The "straightening" configuration requires 2 people per production line, costing 5500 yuan per person, totaling 2.6 × 5500 × 12 = 171600 yuan per production line per year. During the straightening process, a double-headed hot and cold straightening machine is typically used. Assuming each machine has a power consumption of approximately 3 kW / hour (two machines are needed for a daily production of 1800 pairs), the cost is 2 machines × 30 kWh / day × 26 days × 12 months = 17720 kWh / year per production line, equivalent to 14176 yuan / year per line in industrial electricity costs. Therefore, traditional Hongbao (a type of fabric) is difficult to straighten, cumbersome to assemble, and consumes a high amount of electricity. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a low-temperature self-shaping composition and manufacturing method for toe caps. The composition has high flexibility and wear resistance, is not easy to break, and is easy to shape and set after low-temperature heating, and the shape is not easy to rebound after setting. The manufacturing method can save labor, time and processing costs, improve processing efficiency, and effectively reduce energy consumption. The toe caps made by this invention do not require pre-shaping and setting in the shoemaking process, nor do they require shoemaking processes such as "cutting / thinning", which can effectively simplify the shoemaking process and reduce the labor cost of shoemaking.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A low-temperature self-shaping composition for Hong Kong-style heels, characterized in that: the raw materials of the composition comprise the following components in parts by weight: Ethylene-methyl acrylate copolymer (EMAC): 30-80 parts; Hydrogenated styrene-isoprene-styrene block copolymer (SEPS): 5-50 parts; Polydodecanoic acid: 5-15 parts; Mixed solvent: 0.01 to 5 parts.

[0005] The mixed solvent comprises the following components by weight: Capturing agent: 0.5–2 parts; Plasticizer: 2-8 parts; Filler: 2-8 parts; Crosslinking agent: 0.1 to 1 part.

[0006] Further, the capturing agent is 2,2,6,6-tetramethyl-1-piperidinyl-1-oxy free radical, the filler is barium sulfate, and the crosslinking agent is dicumyl peroxide.

[0007] A method for manufacturing a Hong Kong-style toy is also disclosed, wherein the Hong Kong-style toy is made using the aforementioned low-temperature self-shaping composition for Hong Kong-style toy manufacturing, and the steps of the manufacturing method are as follows: 1) Stirring and extrusion: Take the raw materials according to the weight of each component, stir the raw materials evenly, then heat the raw materials in at least two high-temperature sections to soften and bind the raw materials, then extrude them into long strips, cool them, and then dry the surface to obtain strip materials. 2) Cutting and screening: Cut the strip material from step 1) into granules, then screen the material, and then stir and dry the screened material to obtain granular material. 3) Material pre-baking: The granular material from step 2) is heated and pre-baked to evaporate the moisture in the granular material and obtain dry material; 4) Material melting: The dried material from step 3) is heated gradually in at least two high-temperature sections to gradually melt the dried material and obtain molten material; 5) Molding and cooling: The molten material from step 4) is injected into the molding die in at least two stages of pressure, and the molding die is cooled simultaneously during injection molding to obtain a semi-finished product. 6) Edge trimming: Trim the rough edges of the semi-finished product from step 5) to obtain the finished product.

[0008] In step 1), the raw materials are stirred in a mixing tank for 15-20 minutes until they are uniformly mixed. Then, the stirred raw materials are poured into a granulator and heated and stirred in three high-temperature stages at 175-185°C, 200-220°C, and 165-180°C to soften and bind the raw materials. Then, the extruded strip-shaped raw materials are cooled in a water tank for 25-30 seconds, and the water in the tank is kept at a constant temperature of 22-26°C. Finally, a fan is used to remove the surface moisture of the cooled strip-shaped raw materials.

[0009] Further, in step 2), a pelletizer is used to cut the strip material into granules, and then the cut material is sieved through a screen with a mesh size of 3-5 mm. The sieved material is then stirred and dried using a stirring dryer for 9-12 minutes at a temperature of 75-90°C. Cut materials with particles larger than 5 mm are returned to the mixing tank in step 1) and stirred again with the raw materials.

[0010] Furthermore, in step 3), the material is placed in an oven and pre-baked at a temperature of 5-85°C for 1-1.5 hours to evaporate the moisture in the material and obtain dried material.

[0011] Furthermore, in step 4), the raw material obtained in step 1) is heated in four stages by the injection molding machine: 155-168°C, 170-176°C, 178-192°C to 193-198°C, so that the raw material gradually melts and a molten material is obtained.

[0012] Further, in step 5), the injection molding machine is set with three injection pressures: 30-37.5 MPa, 38-42 MPa, and 46-50 MPa. The molten material obtained in step 4) is injected into the molding die in stages. The injection time for the first injection pressure is 8-12 seconds, the injection time for the second injection pressure is 20-28 seconds, and the injection time for the third injection pressure is 12-18 seconds. While the injection molding is being performed, the molding die is cooled by a freezer for 40-50 seconds at a temperature of 5-7°C. After the injection is completed, the molding die is manually opened to remove the part.

[0013] Furthermore, in step 6), the rough edges of the semi-finished product from step 5) are manually trimmed to obtain the finished product.

[0014] The beneficial effects of this invention are as follows: 1. The addition of "ethylene-methyl acrylate copolymer (EMA)" in the composition of this invention can effectively improve the flexibility, impact resistance, and low-temperature toughness of the material. Its Vicat softening temperature is 138°F (approximately 59°C), which can reduce the processing temperature of the material and can be used as a modifier for engineering plastic raw materials. By adding "ethylene-methyl acrylate copolymer (EMA)" to the raw material, the material for making the toy can be modified. Experimental tests show that the toy can be softened in a low-temperature heating environment of 65-100°C. After the toy is softened, it needs to be shaped and cooled in time using a jig / equipment, which can effectively and quickly set the required bending curvature of the toy. Combined with the unique molecular structure of "hydrogenated styrene-isoprene-styrene block copolymer (SEPS)", it can effectively achieve the desired bending curvature of the toy. It can effectively improve the flexibility and wear resistance of products, especially in high or low temperature environments, and can still maintain stable mechanical properties. This allows the product to achieve shape fixation in a short time after low temperature heating and molding, and the shape is not easy to rebound after fixation. Its "polydodecanoic acid (PA12)" belongs to thermoplastic elastomer (TPE) materials. As the polyether content increases, the polymer becomes softer and has higher low temperature impact strength. Its mixed solvent is used as a free radical scavenger in polymer chemistry. It has the advantages of high yield, good selectivity, good stability, recyclability, and can improve material properties or increase volume and weight, and reduce material costs. It is a solid substance that helps to create stronger and more durable polymers by forming crosslinks between individual polymer chains.

[0015] 2. The method for making the toe box of this invention can save labor, time and processing costs, and improve processing efficiency. The product made by this method only needs to be softened by baking and then directly sewn onto the shoe surface and inserted into the last in the shoe manufacturing process. This simplifies the cumbersome process in the traditional shoe manufacturing process, which requires manual cutting with a die, thinning and then processing by a hot and cold setting machine. By simplifying the process, the annual labor cost of the "cutting / thinning" process can be reduced. Moreover, by replacing the double-head hot and cold setting machine with an oven, electricity consumption is greatly saved.

[0016] As can be seen, the low-temperature self-shaping composition of the present invention has high flexibility and wear resistance, is not easy to break, and has the characteristics of being easy to shape and set after low-temperature heating, and the shape is not easy to rebound after setting. Its manufacturing method can save labor, time and processing costs, improve processing efficiency, and effectively reduce energy consumption. The toe box made by the present invention does not require pre-shaping and setting in the shoe manufacturing process, nor does it require shoe manufacturing processes such as "cutting / thinning", which can effectively simplify the shoe manufacturing process and reduce the labor cost of shoe manufacturing. Detailed Implementation

[0017] The present invention will be further described below with reference to specific embodiments: This invention relates to a low-temperature self-shaping composition for Hong Kong-style heels, the composition comprising the following components by weight: Ethylene-methyl acrylate copolymer (EMA): 30-80 parts; Hydrogenated styrene-isoprene-styrene block copolymer (SEPS): 5-50 parts; Polydodecanoic acid: 5-15 parts; Mixed solvent: 0.01 to 5 parts.

[0018] It should be noted that the addition of "ethylene-methyl acrylate copolymer (EMA)" can effectively improve the flexibility, impact resistance and low-temperature toughness of the material. Its Vicat softening temperature is 138°F (approximately 59°C), which can reduce the processing temperature of the material and can be used as a modifier for engineering plastic raw materials. By adding "ethylene-methyl acrylate copolymer (EMA)" to the raw material, the material for making the toy can be modified. Experimental tests have shown that the toy can be softened in a low-temperature heating environment of 65-100°C. After the toy can be softened, it needs to be shaped and cooled in time using jigs / equipment, which can effectively and quickly set the required bending curvature of the toy can be achieved.

[0019] Furthermore, hydrogenated styrene-isoprene-styrene block copolymer (SEPS) is added to the raw materials of this invention. Its unique molecular structure can effectively improve the flexibility and wear resistance of the product. In particular, it can maintain stable mechanical properties even under high or low temperature environments, which allows the present invention to achieve shape fixation in a short time after low-temperature heating and molding. Its antioxidant, weather-resistant, acid and alkali-resistant properties can extend the service life of plastic products and are suitable for plastic parts in outdoor or harsh environments.

[0020] Furthermore, this "polydodecanoic acid (PA12)" is also known as nylon 12. It belongs to thermoplastic elastomer (TPE) materials and is a block polymer, including PA12 segments and polyether segments (polyether block amide). Products rich in PA12 have the main properties of PA12, while the properties of the elastomer become softer and have higher low-temperature impact strength as the polyether content increases.

[0021] The mixed solvent contains the following components by weight: Capturing agent: 0.5–2 parts; Plasticizer: 2-8 parts Filler: 2-8 parts Crosslinking agent: 0.1 to 1 part.

[0022] Furthermore, the scavenging agent is preferably 2,2,6,6-tetramethyl-1-piperidinyl-1-oxy free radical, the filler is preferably barium sulfate (BaSO4), and the crosslinking agent is preferably dicumyl peroxide.

[0023] It should be noted that the "2,2,6,6-tetramethyl-1-piperidinyl-1-oxygen radical (TEMPO)" has functions such as free radical scavenging, singlet oxygen quenching, and selective oxidation. In polymer chemistry, it is used as a free radical scavenger, polymerization inhibitor, anti-aging agent, thermal degradation inhibitor, and photothermal stabilizer. It is a highly efficient polymerization inhibitor and a very effective oxidation catalyst. It can also combine with active chain free radicals to form covalent dormant species. The covalent dormant species can be homolytically cleaved into chain free radicals and then propagated. It can oxidize primary alcohols to aldehydes and secondary alcohols to ketones, and has the advantages of high yield, good selectivity, good stability, and recyclability.

[0024] Furthermore, barium sulfate (BaSO4) is mainly used as an inactive filler in rubber, which can improve the overall performance of rubber through physical filling and surface modification. Barium sulfate has a high density (4.4-4.6 g / cm³), and adding this filler to the raw materials can significantly increase the number of particles per unit volume of rubber and improve the material density. Moreover, barium sulfate has a high hardness (Mohs hardness 3-3.5), which can improve the wear resistance of rubber surface.

[0025] Furthermore, this "dicumyl peroxide (DCP)," also known as vulcanizing agent DCP or dicumyl peroxide, helps to create stronger and more durable polymers by forming crosslinks between individual polymer chains.

[0026] This invention also discloses a method for manufacturing a Hong Kong-style toy bag, which is made using the aforementioned low-temperature self-shaping composition for Hong Kong-style toy bags. The steps of the manufacturing method are as follows: 1) Stirring and extrusion: Take the raw materials according to the weight of each component, stir the raw materials evenly, then heat the raw materials in at least two high-temperature sections to soften and bind the raw materials, then extrude them into long strips, cool them, and then dry the surface to obtain strip materials. 2) Cutting and screening: Cut the strip material from step 1) into granules, then screen the material, and then stir and dry the screened material to obtain granular material. 3) Material pre-baking: The granular material from step 2) is heated and pre-baked to evaporate the moisture in the granular material and obtain dry material; 4) Material melting: The dried material from step 3) is heated gradually in at least two high-temperature sections to gradually melt the dried material and obtain molten material; 5) Molding and cooling: The molten material from step 4) is injected into the molding die in at least two stages of pressure, and the molding die is cooled simultaneously during injection molding to obtain a semi-finished product. 6) Edge trimming: Trim the rough edges of the semi-finished product from step 5) to obtain the finished product.

[0027] In step 1), the raw materials are stirred in a mixing tank for 15-20 minutes until they are uniformly mixed. Then, the stirred raw materials are poured into a granulator, where they are heated and stirred at three high temperatures: 175-185°C, 200-220°C, and 165-180°C, to soften and bind the raw materials. Next, a water tank filled with water is used to cool the extruded strips of raw materials for 25-30 seconds, maintaining a constant water temperature of 22-26°C. Subsequently, a fan is used to remove surface moisture from the cooled strips. It should be noted that the granulator needs to be preheated after startup to ensure that the temperature of each section meets the heating and stirring requirements before the raw materials are poured in. If the stirring temperature of each heating section is too low, the raw materials cannot be formed; if the stirring temperature of each heating section is too high, the raw materials will stick together, hindering the next step of the process.

[0028] Further, in step 2), a pelletizer is used to cut the strip-shaped material into granules, and then the cut material is sieved through a screen with an aperture of 3-5 mm. The sieved material is then shuffled and dried using a mixing dryer for 9-12 minutes at a temperature of 75-90°C. For cut materials with particles larger than 5 mm, they are returned to the mixing tank in step 1) and shuffled again with the raw materials. Sieving the cut material through a screen effectively controls the particle size to ensure uniformity. The mixing and drying operation effectively reduces the moisture content of the granular material, reduces the preheating time of the subsequent material, and effectively reduces the energy consumption of the material preheating process.

[0029] Further, in step 3), the material is placed in an oven and pre-baked at a temperature of 5–85°C for 1–1.5 hours to evaporate the moisture in the material and obtain dried material. It should be noted that if the pre-baking time is less than 1 hour or the temperature is lower than 5°C, the surface of the product is prone to developing bubble-like material flakes, and the surface is not smooth. If the pre-baking time exceeds 1.5 hours or the temperature is higher than 85°C, the material is prone to clumping and cannot be used normally in the next process, and needs to be re-crushed.

[0030] Furthermore, in step 4), the raw material obtained in step 1) is heated in four stages by the injection molding machine: 155-168℃, 170-176℃, 178-192℃ to 193-198℃, so that the raw material gradually melts and a molten material is obtained.

[0031] Further, in step 5), the injection molding machine is set with three injection pressures: 30–37.5 MPa, 38–42 MPa, and 46–50 MPa. The molten material obtained in step 4) is injected into the molding die in stages. The injection time for the first stage is 8–12 seconds, the second stage is 20–28 seconds, and the third stage is 12–18 seconds. Simultaneously with injection molding, the molding die is cooled by a freezer (preferably a water-cooled freezer) for 40–50 seconds at a temperature of 5–7°C. After injection, the molding die is manually opened to remove the part. Simultaneous cooling and shaping during mold forming effectively shortens the time required for manual removal of the part after injection molding.

[0032] Furthermore, in step 6), the rough edges of the semi-finished product from step 5) are manually trimmed to obtain the finished product. Specific Implementation Example 1: This invention discloses a low-temperature self-shaping composition for Hong Kong-style heels, the raw materials of which comprise the following components by weight: Ethylene-methyl acrylate copolymer (EMA): 30 parts; Hydrogenated styrene-isoprene-styrene block copolymer (SEPS): 50 parts; Polydodecanoic acid: 15 parts; Mixed solvent: 3 parts.

[0034] The mixed solvent contains the following components by weight: Capture agent: 2 parts; Plasticizer: 5 parts Filler: 6 parts Crosslinking agent: 0.6 parts.

[0035] The scavenging agent is preferably 2,2,6,6-tetramethyl-1-piperidinyl-1-oxy free radical, the filler is preferably barium sulfate (BaSO4), and the crosslinking agent is preferably dicumyl peroxide.

[0036] This invention also discloses a method for manufacturing a Hong Kong-style toy bag, which is made using the aforementioned low-temperature self-shaping composition for Hong Kong-style toy bags. The steps of the manufacturing method are as follows: First, the raw materials are taken according to the weight of each component and stirred in a mixing tank for 15 minutes to ensure uniform mixing. Then, the stirred raw materials are poured into a granulator and heated and stirred in three high-temperature stages at 175°C, 200°C and 165°C to soften and bind the raw materials. The raw materials are then extruded into long strips and cooled in a water tank for 25 seconds. After cooling, the strips are removed by a fan and dried to obtain strip-shaped materials. The water in the water tank is kept at a constant temperature of 22°C.

[0037] Secondly, a pelletizer is used to cut the strip material into granules, and then a sieve with a 3mm aperture is used to screen the cut material. Subsequently, a mixing dryer is used to mix and dry the screened material at 75℃ for 11 minutes to obtain granular material. Cut materials with particles larger than 5mm are returned to the mixing tank of the first step and mixed with the raw materials again.

[0038] Next, the granular material is placed in an oven and preheated at 5°C for 1.2 hours to evaporate the moisture in the granular material and obtain dried material.

[0039] Furthermore, an injection molding machine is used, with four temperature settings from 155℃, 170℃, 178℃ to 193℃, to gradually heat the dried material, causing it to gradually melt and obtain molten material. Then, using an injection molding machine, three injection pressures of 30MPa, 38MPa, and 46MPa are set to gradually increase the pressure and inject the molten material into the molding die. During injection molding, the molding die is cooled simultaneously for 40 seconds at a temperature of 7°C. After injection, the molding die is manually opened to remove the part, obtaining a semi-finished product. The injection time for the first injection pressure is 8 seconds, the second injection pressure is 28 seconds, and the third injection pressure is 18 seconds.

[0040] Finally, the rough edges of the semi-finished product are manually trimmed to obtain the finished product. Specific Implementation Example 2: This invention discloses a low-temperature self-shaping composition for Hong Kong-style heels, the raw materials of which comprise the following components by weight: Ethylene-methyl acrylate copolymer (EMA): 46 parts; Hydrogenated styrene-isoprene-styrene block copolymer (SEPS): 42 parts; Polydodecanoic acid: 13.8 parts; Mixed solvent: 1.7 parts.

[0042] The mixed solvent contains the following components by weight: Capturing agent: 0.7 parts; Plasticizer: 6.3 parts Filler: 8 parts Crosslinking agent: 0.1 parts.

[0043] The scavenging agent is preferably 2,2,6,6-tetramethyl-1-piperidinyl-1-oxy free radical, the filler is preferably barium sulfate (BaSO4), and the crosslinking agent is preferably dicumyl peroxide.

[0044] This invention also discloses a method for manufacturing a Hong Kong-style toy bag, which is made using the aforementioned low-temperature self-shaping composition for Hong Kong-style toy bags. The steps of the manufacturing method are as follows: First, the raw materials are taken according to the weight of each component and stirred in a mixing tank for 16 minutes to ensure uniform mixing. Then, the stirred raw materials are poured into a granulator and heated and stirred in three high-temperature stages at 180°C, 208°C and 176°C to soften and bind the raw materials. The raw materials are then extruded into long strips and cooled in a water tank for 29 seconds. After cooling, the strips are removed by a fan and dried to obtain strip-shaped materials. The water in the water tank is kept at a constant temperature of 25.5°C.

[0045] Secondly, a pelletizer is used to cut the strip-shaped material into granules. Then, a sieve with a 3.5mm aperture is used to screen the cut material. Subsequently, a mixing dryer is used to dry the screened material at 82℃ for 9 minutes to obtain granular material. Cut materials with particles larger than 5mm are returned to the mixing tank of the first step and mixed with the raw materials again.

[0046] Next, the granular material is placed in an oven and preheated at 18°C ​​for 1.5 hours to evaporate the moisture in the granular material and obtain dried material.

[0047] Furthermore, an injection molding machine is used, with four temperature settings from 160℃, 172℃, 180℃ to 198℃, to gradually heat the dried material, causing it to gradually melt and obtain molten material. Then, using an injection molding machine, three injection pressures of 36.5MPa, 39.5MPa, and 486MPa were set to gradually increase the pressure and inject the molten material into the molding die. During the injection molding process, the molding die was simultaneously cooled for 46 seconds at a temperature of 6°C. After injection, the molding die was manually opened to remove the part, obtaining a semi-finished product. The injection time for the first injection pressure was 11.5 seconds, the second injection pressure was 23 seconds, and the third injection pressure was 12 seconds.

[0048] Finally, the rough edges of the semi-finished product are manually trimmed to obtain the finished product. Specific Implementation Example 3: This invention discloses a low-temperature self-shaping composition for Hong Kong-style heels, the raw materials of which comprise the following components by weight: Ethylene-methyl acrylate copolymer: 65 parts; Hydrogenated styrene-isoprene-styrene block copolymer (SEPS): 35 parts; Polydodecanoic acid: 12 parts; Mixed solvent: 0.01 parts.

[0050] The mixed solvent contains the following components by weight: Capturing agent: 0.5 parts; Plasticizer: 8 parts Filler: 5.6 parts Crosslinking agent: 0.8 parts.

[0051] The scavenging agent is preferably 2,2,6,6-tetramethyl-1-piperidinyl-1-oxy free radical, the filler is preferably barium sulfate (BaSO4), and the crosslinking agent is preferably dicumyl peroxide.

[0052] This invention also discloses a method for manufacturing a Hong Kong-style toy bag, which is made using the aforementioned low-temperature self-shaping composition for Hong Kong-style toy bags. The steps of the manufacturing method are as follows: First, the raw materials are taken according to the weight proportions of each component and stirred in a mixing tank for 16.5 minutes to ensure uniform mixing. Then, the stirred raw materials are poured into a granulator and heated and stirred in three high-temperature stages at 175°C, 216°C, and 172°C to soften and bind the raw materials. The mixture is then extruded into long strips and cooled in a water tank for 26.5 seconds. Subsequently, a fan is used to remove the water-cooled long strips for surface drying to obtain strip-shaped materials. The water in the tank is kept at a constant temperature of 24°C.

[0053] Secondly, a pelletizer is used to cut the strip-shaped material into granules. Then, a sieve with a 5mm aperture is used to screen the cut material. Subsequently, a mixing dryer is used to dry the screened material at a temperature of 78℃ for 10 minutes to obtain granular material. Cut materials with particles larger than 5mm are returned to the mixing tank of the first step and mixed with the raw materials again.

[0054] Next, the granular material is placed in an oven and preheated at 60°C for 1.3 hours to evaporate the moisture in the granular material and obtain dried material.

[0055] Furthermore, an injection molding machine is used, with four temperature settings: 162℃, 175℃, 190℃ to 195℃. The dried material is gradually heated to a molten state, thus obtaining molten material. Then, using an injection molding machine, three injection pressures of 35MPa, 40MPa, and 50MPa are set to gradually increase the pressure and inject the molten material into the molding die. During injection molding, the molding die is cooled simultaneously for 44 seconds at a temperature of 5.5℃. After injection, the molding die is manually opened to remove the part, obtaining a semi-finished product. The injection time for the first injection pressure is 9.5 seconds, the second injection pressure is 20 seconds, and the third injection pressure is 15 seconds.

[0056] Finally, the rough edges of the semi-finished product are manually trimmed to obtain the finished product. Specific Implementation Example 4: This invention discloses a low-temperature self-shaping composition for Hong Kong-style heels, the raw materials of which comprise the following components by weight: Ethylene-methyl acrylate copolymer: 73 parts; Hydrogenated styrene-isoprene-styrene block copolymer (SEPS): 26 parts; Polydodecyl lactam: 5 parts; Mixed solvent: 5 parts.

[0058] The mixed solvent contains the following components by weight: Capturing agent: 1.3 parts; Plasticizer: 3.5 parts Filler: 7.4 parts Crosslinking agent: 0.4 parts.

[0059] The scavenging agent is preferably 2,2,6,6-tetramethyl-1-piperidinyl-1-oxy free radical, the filler is preferably barium sulfate (BaSO4), and the crosslinking agent is preferably dicumyl peroxide.

[0060] This invention also discloses a method for manufacturing a Hong Kong-style toy bag, which is made using the aforementioned low-temperature self-shaping composition for Hong Kong-style toy bags. The steps of the manufacturing method are as follows: First, the raw materials are taken according to the weight of each component and stirred in a mixing tank for 18.5 minutes to ensure uniform mixing. Then, the stirred raw materials are poured into a granulator and heated and stirred in three high-temperature stages at 185°C, 200°C and 167°C to soften and bind the raw materials. The raw materials are then extruded into long strips and cooled in a water tank for 28 seconds. After cooling, the strips are removed by a fan and dried to obtain strip-shaped materials. The water in the water tank is kept at a constant temperature of 23.5°C.

[0061] Secondly, a pelletizer is used to cut the strip material into granules, and then a sieve with a 4.5mm aperture is used to screen the cut material. Subsequently, a mixing dryer is used to dry the screened material at a temperature of 86℃ for 10.5 minutes to obtain granular material. Cut materials with particles larger than 5mm are returned to the mixing tank of the first step and mixed again with the raw materials.

[0062] Next, the granular material is placed in an oven and preheated at 45°C for 1.4 hours to evaporate the moisture in the granular material and obtain dried material.

[0063] Furthermore, an injection molding machine is used, with four temperature settings from 158℃, 173℃, 185℃ to 197℃, to gradually heat the dried material, causing it to gradually melt and obtain molten material. Then, using an injection molding machine, three injection pressures of 37.5MPa, 42MPa, and 49MPa were set to gradually increase the pressure and inject the molten material into the molding die. During the injection molding process, the molding die was simultaneously cooled for 48 seconds at a temperature of 6.5℃. After injection, the molding die was manually opened to remove the part, obtaining a semi-finished product. The injection time for the first injection pressure was 12 seconds, the second injection pressure was 27 seconds, and the third injection pressure was 14.5 seconds.

[0064] Finally, the rough edges of the semi-finished product are manually trimmed to obtain the finished product. Specific Implementation Example 5: This invention discloses a low-temperature self-shaping composition for Hong Kong-style heels, the raw materials of which comprise the following components by weight: Ethylene-methyl acrylate copolymer: 80 parts; Hydrogenated styrene-isoprene-styrene block copolymer (SEPS): 5 parts; Polydodecanoic acid: 10 parts; Mixed solvent: 2.5 parts.

[0066] The mixed solvent contains the following components by weight: Capturing agent: 1 part; Plasticizer: 2 parts Filler: 8 parts Crosslinking agent: 1 part.

[0067] The scavenging agent is preferably 2,2,6,6-tetramethyl-1-piperidinyl-1-oxy free radical, the filler is preferably barium sulfate (BaSO4), and the crosslinking agent is preferably dicumyl peroxide.

[0068] This invention also discloses a method for manufacturing a Hong Kong-style toy bag, which is made using the aforementioned low-temperature self-shaping composition for Hong Kong-style toy bags. The steps of the manufacturing method are as follows: First, the raw materials are taken according to the weight of each component and stirred in a mixing tank for 20 minutes to ensure uniform mixing. Then, the stirred raw materials are poured into a granulator and heated and stirred in three high-temperature stages at 182°C, 219°C and 168°C to soften and bind the raw materials. The raw materials are then extruded into long strips and cooled in a water tank for 30 seconds. After cooling, the strips are removed by a fan and dried to obtain strip-shaped materials. The water in the water tank is kept at a constant temperature of 26°C.

[0069] Secondly, a pelletizer is used to cut the strip-shaped material into granules. Then, a sieve with a 4mm aperture is used to screen the cut material. Subsequently, a mixing dryer is used to dry the screened material at 90℃ for 12 minutes to obtain granular material. Cut materials with particles larger than 5mm are returned to the mixing tank of the first step and mixed with the raw materials again.

[0070] Next, the granular material is placed in an oven and preheated at 85°C for 1 hour to evaporate the moisture in the granular material and obtain dried material.

[0071] Furthermore, an injection molding machine is used, with four temperature settings from 168℃, 176℃, 192℃ to 194℃, to gradually heat the dried material, causing it to gradually melt and obtain molten material. Then, using an injection molding machine, three injection pressures of 33MPa, 41MPa, and 47.5MPa are set to gradually increase the pressure and inject the molten material into the molding die. During injection molding, the molding die is cooled simultaneously for 50 seconds at a temperature of 5°C. After injection, the molding die is manually opened to remove the part, obtaining a semi-finished product. The injection time for the first injection pressure is 10 seconds, the second injection pressure is 25 seconds, and the third injection pressure is 17.5 seconds.

[0072] Finally, the rough edges of the semi-finished product are manually trimmed to obtain the finished product.

[0073] The Hongbao (a type of decorative toy) produced using the aforementioned low-temperature self-shaping composition formulation and manufacturing method, after testing, has a density of 0.95 g / m³. 3The rebound rate is 89%. The toe box produced by this invention only requires an oven to soften it in a low-temperature heating environment of 65-100℃. After shaping and cooling, it can effectively and quickly set the required curvature of the toe box, and the shape after setting is not easy to rebound. Therefore, in the shoe manufacturing process, the toe box only needs to be softened by baking and then directly sewn onto the shoe surface and inserted into the last. This simplifies the cumbersome process in the traditional shoe manufacturing process, which requires manual cutting with a die, thinning, and then processing by a hot and cold setting machine. By simplifying the process, the annual labor cost of processes such as "cutting / thinning" and "setting" can be reduced. Moreover, if we calculate based on a 300-watt oven, 3 kWh / day × 30 days / month × 12 months = 1080 kWh, which is only 6.095% of the annual electricity consumption of a double-head hot and cold setting machine, which greatly saves electricity.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Therefore, any equivalent changes or modifications made by those skilled in the art to the structure, method, features and principles of the present invention without departing from the spirit of the present invention should fall within the protection scope of the patent application of the present invention.

Claims

1. A low-temperature self-shaping composition for Hong Kong-style heels, characterized in that: The raw materials of this composition contain the following components in parts by weight: Ethylene-methyl acrylate copolymer (EMAC): 30-80 parts; Hydrogenated styrene-isoprene-styrene block copolymer (SEPS): 5-50 parts; Polydodecanoic acid: 5-15 parts; Mixed solvent: 0.01 to 5 parts.

2. The method for making a Hong Kong-style baby carrier according to claim 1, characterized in that: The mixed solvent comprises the following components by weight: Capturing agent: 0.5–2 parts; Plasticizer: 2-8 parts; Filler: 2-8 parts; Crosslinking agent: 0.1 to 1 part.

3. The method for making a Hong Kong-style hemp bag according to claim 2, characterized in that: The scavenging agent is 2,2,6,6-tetramethyl-1-piperidinyl-1-oxy free radical, the filler is barium sulfate, and the crosslinking agent is dicumyl peroxide.

4. A method for making a Hong Kong-style toy bag, characterized in that, The aforementioned tote bag is made using the low-temperature self-shaping composition for tote bags as described in claims 1-3, and the manufacturing method comprises the following steps: 1) Stirring and extrusion: Take the raw materials according to the weight of each component, stir the raw materials evenly, then heat the raw materials in at least two high-temperature sections to soften and bind the raw materials, then extrude them into long strips, cool them, and then dry the surface to obtain strip materials. 2) Cutting and screening: Cut the strip material from step 1) into granules, then screen the material, and then stir and dry the screened material to obtain granular material. 3) Material pre-baking: The granular material from step 2) is heated and pre-baked to evaporate the moisture in the granular material and obtain dry material; 4) Material melting: The dried material from step 3) is heated gradually in at least two high-temperature sections to gradually melt the dried material and obtain molten material; 5) Molding and cooling: The molten material from step 4) is injected into the molding die in at least two stages of pressure, and the molding die is cooled simultaneously during injection molding to obtain a semi-finished product. 6) Edge trimming: Trim the rough edges of the semi-finished product from step 5) to obtain the finished product.

5. The method for making a Hong Kong-style hemp bowl according to claim 4, characterized in that: In step 1), the raw materials are stirred in a mixing tank for 15-20 minutes until they are uniformly mixed. Then, the stirred raw materials are poured into a granulator, which heats and stirs the raw materials at three high temperatures: 175-185°C, 200-220°C, and 165-180°C, to soften and bind the raw materials. Then, a water tank filled with water is used to cool the extruded strip-shaped raw materials for 25-30 seconds, and the water in the tank is kept at a constant temperature of 22-26°C. Finally, a fan is used to remove the surface moisture of the water-cooled strip-shaped raw materials.

6. The method for making a Hong Kong-style baby carrier according to claim 4, characterized in that: In step 2), a pelletizer is used to cut the strip material into granules, and then the cut material is sieved through a screen with a mesh size of 3-5 mm. The sieved material is then stirred and dried using a stirring dryer for 9-12 minutes at a temperature of 75-90°C. Cut materials with particles larger than 5 mm are returned to the mixing tank in step 1) and stirred again with the raw materials.

7. The method for making a Hong Kong-style hemp bag according to claim 4, characterized in that: In step 3), the material is placed in an oven and pre-baked at a temperature of 5-85°C for 1-1.5 hours to evaporate the moisture in the material and obtain dried material.

8. The method for making a Hong Kong-style baby carrier according to claim 4, characterized in that: In step 4), the raw material obtained in step 1) is heated in four stages by the injection molding machine: 155-168°C, 170-176°C, 178-192°C to 193-198°C, so that the raw material gradually melts and a molten material is obtained.

9. The method for making a Hong Kong-style baby carrier according to claim 4, characterized in that: In step 5), the injection molding machine is set with three injection pressures: 30–37.5 MPa, 38–42 MPa, and 46–50 MPa. The molten material obtained in step 4) is injected into the molding die in stages. The injection time for the first injection pressure is 8–12 seconds, the injection time for the second injection pressure is 20–28 seconds, and the injection time for the third injection pressure is 12–18 seconds. While the injection molding is being performed, the molding die is cooled by a freezer for 40–50 seconds at a temperature of 5–7°C. After the injection is completed, the molding die is manually opened to remove the part.

10. The method for making a Hong Kong-style baby carrier according to claim 4, characterized in that: In step 6), the rough edges of the semi-finished product from step 5) are manually trimmed to obtain the finished product.