Abrégé

Disclosed is a low-temperature supercritical foaming process, comprising the following steps: (1) bringing a polyolefin material or a thermoplastic elastomer material into contact with at least one inert gas in a reactor at a pressure higher than atmospheric pressure to drive the gas into the material, the pressure holding temperature of the polyolefin material or thermoplastic elastomer material being lower than the melting temperature of the material by 5-40° C.; (2) reducing the pressure to expand the material so as to produce a primary foamed material, and taking out the primary foamed material; and (3) taking out the primary foamed material and putting same into a tunnel furnace for secondary foaming, the temperature of the tunnel furnace being higher than the melting temperature of the material. Compared with the prior art, the present invention features high production efficiency, energy saving, and improvement of the reactor utilization rate.

Classes IPC  ?

• C08J 9/12 - Mise en œuvre de substances macromoléculaires pour produire des matériaux ou objets poreux ou alvéolaires; Leur post-traitement utilisant des gaz de gonflage produits par un agent de gonflage introduit au préalable par un agent physique de gonflage
• C08J 9/36 - Post-traitement

Abrégé

An ETPU cushioning midsole and rubber outsole integral molding process, comprising the following steps: (1) cutting a rubber sheet according to an actually required shape and performing washing and drying in sequence to obtain a rubber outsole; (2) opening a molding mold of a foam molding machine and placing the rubber outsole at the bottom of the molding mold; (3) closing the molding mold of the foam molding machine, using a feeder to feed ETPU particles to the top of the rubber outsole in the molding mold, and injecting water vapor to heat the ETPU particles to melt the surface of the ETPU particles, performing pressing to bond adjacent ETPU particles together so that the ETPU particles and the rubber outsole are also bonded; and (4) performing cooling and demolding to obtain a sole integrally formed by an ETPU cushioning midsole and the rubber outsole.

Classes IPC  ?

• A43B 13/04 - Matières plastiques, caoutchouc ou fibre vulcanisée
• A43B 13/18 - Semelles élastiques
• B29D 35/12 - Fabrication de leurs parties constitutives, p.ex. semelles, talons ou empeignes, par une technique de moulage

Abrégé

Disclosed in the present invention is a method for preparing an ultra-light thermoplastic elastomer foaming material, comprising the following steps: (1) placing a thermoplastic polyurethane elastomer in a first reaction kettle, introducing carbon dioxide to implement first supercritical foaming, and releasing the pressure to obtain a foaming intermediate product; (2) placing the foaming intermediate product in a second reaction kettle, introducing nitrogen to implement second supercritical foaming, and releasing the pressure to obtain a foaming product with a density of 0.05-0.1 g/cm3. Compared to the prior art, the present invention uses a two-step method, the first step using carbon dioxide for nucleation and the second step using nitrogen for foaming to obtain a foaming material with extremely low density, low shrinkage, good elasticity, and stable performance.

Classes IPC  ?

• C08J 9/12 - Mise en œuvre de substances macromoléculaires pour produire des matériaux ou objets poreux ou alvéolaires; Leur post-traitement utilisant des gaz de gonflage produits par un agent de gonflage introduit au préalable par un agent physique de gonflage
• C08L 75/04 - Polyuréthanes

Abrégé

Disclosed is an environment-friendly thermoplastic elastomer foaming and setting process, comprising the following steps: (1) enabling a thermoplastic elastomer material to contact at least one inert gas in a reaction kettle having the pressure higher than atmospheric pressure so that the gas is driven to enter the material, the pressure maintaining temperature of the reaction kettle is 5-40℃ lower than the melting temperature of the material; (2) maintaining the temperature and then decreasing the pressure so that the thermoplastic elastomer material is formed into a primary foaming material, and then taking the primary foaming material out from the reaction kettle; and (3) transferring the primary foaming material into a mold of a setting machine, heating for secondary foaming and performing mold setting to obtain a finished product. Compared with the prior art, in the present invention, because the thermoplastic elastomer material is not subjected to a crosslinking operation, the finished product molded thereby can be conveniently recycled; in addition, because foaming and setting are implemented in one step in the mold of the setting machine, the problem that the material shrinks due to setting is solved.

Classes IPC  ?

• B29C 44/08 - Moulage par pression interne engendrée dans la matière, p.ex. par gonflage ou par moussage pour la fabrication d'objets de longueur définie, c.à d. d'objets séparés en plusieurs étapes d'expansion
• B29C 44/34 - Moulage par pression interne engendrée dans la matière, p.ex. par gonflage ou par moussage - Eléments constitutifs, détails ou accessoires; Opérations auxiliaires
• B29C 44/38 - Alimentation en matière à mouler dans une cavité de moulage fermée, c.à d. pour la fabrication d'objets de longueur définie
• B29L 31/50 - Chaussures ou leurs parties constitutives

Abrégé

Provided in the present invention are a foam molding process and apparatus for an environment-friendly shoe sole. The foam molding process comprises the following steps: heating thermoplastic elastomer particles in a heating apparatus until the temperature reaches above a softening point; placing the softened thermoplastic elastomer particles in a pressurizing tank, and making the softened thermoplastic elastomer particles contact with at least one inert gas in the pressurizing tank with the pressure higher than the atmospheric pressure; conveying to a setting machine the thermoplastic elastomer particles saturated with the inert gas in a conveying mechanism under the condition of pressure maintaining, and in the conveying process, heating the thermoplastic elastomer particles saturated with the inert gas, wherein the heating temperature is higher than the melting temperature of 10-40 degree centigrade of the thermoplastic elastomer particles; and keeping the described temperature in a mold of the setting machine, then reducing the pressure, and obtaining the finished shoe sole after foaming and mold setting. The present invention uses the manner of heating and softening the thermoplastic elastomer particles and then placing same into the other container to be pressurized and injected with gas, thus having higher efficiency.

Classes IPC  ?

• B29C 44/02 - Moulage par pression interne engendrée dans la matière, p.ex. par gonflage ou par moussage pour la fabrication d'objets de longueur définie, c.à d. d'objets séparés
• B29C 44/34 - Moulage par pression interne engendrée dans la matière, p.ex. par gonflage ou par moussage - Eléments constitutifs, détails ou accessoires; Opérations auxiliaires
• B29C 44/38 - Alimentation en matière à mouler dans une cavité de moulage fermée, c.à d. pour la fabrication d'objets de longueur définie
• B29L 31/50 - Chaussures ou leurs parties constitutives

Abrégé

The present invention provides an environment-friendly foaming process and molding device for a thermoplastic elastomer. The method comprises the following steps: heat thermoplastic elastomer particles until the temperature reaches a softening point or above; convey the softened thermoplastic elastomer particles to a setting machine in a conveying mechanism under the condition that pressure is higher than atmospheric pressure, enable the softened thermoplastic elastomer particles to be in contact with at least one inert gas in a conveying process, and meanwhile heat the softened thermoplastic elastomer particles; and the conveying mechanism guides a thermoplastic elastomer which is full of the inert gas and is in a molten state into a mold of the setting machine, and obtain a finished product after foaming and mold setting. According to the present invention, a spiral conveyor is adopted for conveying and foaming the thermoplastic elastomer particles, the spiral conveyor continuously rotates, so that the thermoplastic elastomer particles can be stirred to be evenly heated while being conveyed, and make full contact with the gas, thereby improving the foaming efficiency.

Classes IPC  ?

• B29C 44/02 - Moulage par pression interne engendrée dans la matière, p.ex. par gonflage ou par moussage pour la fabrication d'objets de longueur définie, c.à d. d'objets séparés
• B29C 44/34 - Moulage par pression interne engendrée dans la matière, p.ex. par gonflage ou par moussage - Eléments constitutifs, détails ou accessoires; Opérations auxiliaires
• B29C 44/38 - Alimentation en matière à mouler dans une cavité de moulage fermée, c.à d. pour la fabrication d'objets de longueur définie
• B29L 31/50 - Chaussures ou leurs parties constitutives

Abrégé

Disclosed is a low-temperature supercritical foaming process, comprising the following steps: (1) bringing a polyolefin material or a thermoplastic elastomer material into contact with at least one inert gas in a reactor at a pressure higher than atmospheric pressure to drive the gas into the material, the pressure holding temperature of the polyolefin material or thermoplastic elastomer material being lower than the melting temperature of the material by 5-40°C; (2) reducing the pressure to expand the material so as to produce a primary foamed material, and taking out the primary foamed material; and (3) taking out the primary foamed material and putting same into a tunnel furnace for secondary foaming, the temperature of the tunnel furnace being higher than the melting temperature of the material. Compared with the prior art, the present invention features high production efficiency, energy saving, and improvement of the reactor utilization rate.

Classes IPC  ?

• C08J 9/12 - Mise en œuvre de substances macromoléculaires pour produire des matériaux ou objets poreux ou alvéolaires; Leur post-traitement utilisant des gaz de gonflage produits par un agent de gonflage introduit au préalable par un agent physique de gonflage
• C08L 23/06 - Polyéthylène
• C08L 23/12 - Polypropylène
• C08L 23/08 - Copolymères de l'éthylène
• C08L 75/04 - Polyuréthanes
• C08L 67/00 - Compositions contenant des polyesters obtenus par des réactions créant une liaison ester carboxylique dans la chaîne principale; Compositions contenant des dérivés de tels polymères
• C08L 77/00 - Compositions contenant des polyamides obtenus par des réactions créant une liaison amide carboxylique dans la chaîne principale; Compositions contenant des dérivés de tels polymères

Abrégé

Disclosed in the present invention is a method for preparing PEBAX into a TPV foam material, and a TPV foam material, said method comprising the following steps: ① pre-vulcanization of PEBAX/MPU or PEBAX/EPDM-MAH: mixing a vulcanizing agent and an alkaline filler evenly to prepare a mixture, and plasticizing MPU or EPDM-MAH into softened MPU or EPDM-MAH; kneading the mixture and the plasticized MPU or EPDM-MAH until the components are evenly mixed to obtain a kneaded material; blending the kneaded material and PEBAX to obtain a TPV material, and performing a vulcanization operation on the TPV material to obtain a pre-vulcanized TPV material; ② supercritical foaming: after cooling to room temperature, placing the pre-vulcanized TPV material in a high-pressure reaction vessel and performing supercritical foaming to obtain a TPV foam material. The TPV foam material obtained in the present invention combines excellent performance of two types of material, is lightweight and flexible, and has good resilience. Tensile strength, tearing strength, peel strength and adhesiveness are all greatly improved relative to PEBAX, and the material has good formability, excellent energy absorption and shock absorbing performance, and is more suited for fields such as the manufacturing of shock absorbing components or shock absorbing packaging material.

Classes IPC  ?

• C08L 77/00 - Compositions contenant des polyamides obtenus par des réactions créant une liaison amide carboxylique dans la chaîne principale; Compositions contenant des dérivés de tels polymères
• C08L 75/00 - Compositions contenant des polyurées ou des polyuréthanes; Compositions contenant des dérivés de tels polymères
• C08J 9/00 - Mise en œuvre de substances macromoléculaires pour produire des matériaux ou objets poreux ou alvéolaires; Leur post-traitement