Preparation method of ETPU damping shoe midsole

Abstract

The invention discloses a preparation method of an ETPU shock-absorbing shoe insole, which comprises the following steps: step 1, glue solution mixing: pouring an adhesive, a chain extender and a catalyst into a container, and uniformly stirring and mixing to obtain an adhesive mixed solution for later use; step 2, respectively pouring the adhesive mixed solution obtained in the step 1 and ETPU particle raw materials into a stirring barrel, and uniformly stirring to obtain a mixed material for later use; thirdly, a mold is prepared, and impurities in the mold are cleaned; (4) mold closing: quickly pouring the mixed material in the step (2) into the mold, and quickly closing the mold; (5) heating: heating the mold in the step (4) for 6 minutes at the temperature of 70 DEG C, so that the mixed material in the mold is shaped; 6, after the heated mold in the step 5 is naturally cooled, the ETPU shock absorption shoe insole is obtained.The manufacturing process is simple, no TPU outer film exists, the surface of the shock absorption shoe insole has the anti-slip effect, and meanwhile the manufactured shock absorption shoe insole is light in weight.

Description

Technical Field

[0001] The present invention relates to the technical field of shoe soles, and in particular to a method for preparing an ETPU shock-absorbing shoe midsole. Background Art

[0002] The sole of a shoe consists of an outsole and a midsole. The comfort of wearing a shoe is directly related to the softness and resilience of the sole. Traditional sole materials are mostly made of foamed materials such as EVA and PU. After being used in extremely low or high temperature environments, these traditional shoe materials become hard and have poor elasticity, resulting in discomfort.

[0003] As a result, a shoe midsole made of ETPU material appeared on the market. The manufacturing process of this shoe midsole is to first vacuum-adsorb a layer of transparent TPU outer film on the inner wall of the mold cavity, then pour ETPU particles and adhesive into the mold in sequence, and then squeeze the excess adhesive through the mold. Finally, the mold is heated and shaped so that the TPU outer film wraps around the ETPU particles and forms an integrated ETPU shock-absorbing shoe midsole. When making the sole, the ETPU shock-absorbing shoe midsole is integrally molded with the outsole (rubber non-slip sole). The ETPU shock-absorbing shoe midsole produced by this process has the following main defects: 1. The outer layer of the midsole of this ETPU shock-absorbing shoe is attached with a layer of TPU outer film. When the ETPU shock-absorbing shoe midsole is used as a slipper, when there are water stains or foot sweat on the surface of the midsole, it is not only easy to slip, but also makes a "chirp, chirp, chirp..." sound, which is particularly unsuitable for home use and will cause noise troubles.

[0004] 2. The manufacturing process of the above-mentioned shoe midsole is complicated, the manufacturing process is tedious, and a large amount of adhesive is used, which not only increases the waste of raw materials and high costs, but also causes problems such as the weight of the manufactured product. Summary of the Invention

[0005] The purpose of the present invention is to solve the above technical problems and provide a method for preparing an ETPU shock-absorbing shoe midsole. The ETPU shock-absorbing shoe midsole produced by this preparation method has good anti-slip effect when worn, and the production process is simple, the amount of adhesive used is small, and the cost is low.

[0006] To achieve the above object, the present invention provides a technical solution: a method for preparing an ETPU shock-absorbing shoe midsole, comprising the following steps: Step 1: Mixing the adhesive solution: Pour a certain amount of adhesive, chain extender and catalyst into a container and stir to mix evenly to obtain an adhesive mixture for use; Step 2: Pour the adhesive mixture and ETPU particle raw material in step 1 into a mixing bucket and stir evenly until each ETPU particle raw material is coated with adhesive to obtain a mixed material for standby use; Step 3: prepare a mold, clean the impurities in the mold, and blow dry it with an air gun. The mold can be a midsole mold or an outsole mold; Step 4: Close the mold, quickly pour the mixed material in step 2 into the mold, and quickly close the mold; Step 5: Heating: Heat the mold after closing the mold in step 4 at 70°C for 6 minutes to shape the mixed material in the mold; Step 6: After the mold heated in step 5 cools naturally, take out the finished product to obtain the ETPU shock-absorbing shoe midsole.

[0007] Preferably, the weight ratio of the adhesive mixture to the ETPU particle raw material of the present invention is 1:9.

[0008] Preferably, the weight ratio of the adhesive, chain extender and catalyst of the present invention is 1000:3:3.

[0009] Preferably, the adhesive of the present invention is polyether polyol.

[0010] Preferably, the chain extender of the present invention is chain extender E-100.

[0011] Preferably, the catalyst of the present invention is polyurethane organotin catalyst T9.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention forms the shock-absorbing shoe midsole in one step by using adhesive and ETPU granular raw materials. Not only is the manufacturing process simple, but there is no TPU outer film, so that the surface of the shock-absorbing shoe midsole has an anti-slip effect.

[0013] 2. The present invention reduces the amount of adhesive used by mixing the adhesive mixture with ETPU particles in a certain ratio, and ensures the firmness of the ETPU particles after foaming and shaping, making them not easy to fall off. In addition, the shock-absorbing shoe midsole produced is light in weight and has excellent resilience and high elasticity.

[0014] 3. The present invention uses E-100 as a chain extender to increase the hardness of the outer surface of each ETPU particle wrapped by the adhesive, which can more effectively play a massage role. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the following examples. The embodiments of the present invention include but are not limited to the following examples. A method for preparing an ETPU shock-absorbing shoe midsole comprises the following steps: Step 1: Mixing the adhesive solution: Pour a certain amount of adhesive, chain extender and catalyst into a container and stir to mix evenly to obtain an adhesive mixture for use; Step 2: Pour the adhesive mixture and ETPU particle raw material in step 1 into a mixing bucket and stir evenly until each ETPU particle raw material is coated with adhesive to obtain a mixed material for standby use; Step 3: prepare a mold, clean the impurities in the mold, and blow dry it with an air gun. The mold can be a midsole mold or an outsole mold; Step 4: Close the mold, quickly pour the mixed material in step 2 into the mold, and quickly close the mold; Step 5: Heating: Heat the mold after closing the mold in step 4 at 70°C for 6 minutes to shape the mixed material in the mold; Step 6: After the mold heated in step 5 cools naturally, open the mold and take out the finished product to obtain the ETPU shock-absorbing shoe midsole.

[0016] In some embodiments, the weight ratio of the adhesive mixture to the ETPU particle raw material is 1:9. By adjusting the ratio of the adhesive mixture to the ETPU particle raw material, not only the amount of adhesive used is reduced, but also the firmness of the ETPU particles foaming and shaping is ensured, and they are not easy to fall off. At the same time, the shock-absorbing shoe midsole produced is light in weight.

[0017] In some embodiments, the weight ratio of the adhesive, the chain extender, and the catalyst is 1000:3:3.

[0018] In some embodiments, the adhesive is a polyether polyol, wherein the polyether polyol.

[0019] In some embodiments, as the most preferred, the chain extender of the present invention is chain extender E-100, which has the following advantages: By improving bond strength: As a chain extender, chain extender E-100 can significantly improve the bond strength and hydrolysis resistance of adhesives.

[0020] Shorten demoulding time: Chain extender E-100 reacts quickly with polyurethane prepolymer, which can significantly shorten demoulding time and improve production efficiency.

[0021] Improved initial strength: Adhesives using chain extender E-100 have higher initial strength after curing and can withstand external loads more quickly.

[0022] Hydrolysis and heat resistance: The adhesive prepared with chain extender E-100 has good hydrolysis and heat resistance, and is suitable for bonding needs in various harsh environments.

[0023] In some embodiments, as the most preferred, the catalyst of the present invention is polyurethane organotin catalyst T9, which has the following advantages: Improve curing speed: Polyurethane organotin catalyst T9 can provide the gel speed required for curing, generate polyurethane with high selectivity, and thus accelerate the curing process of the adhesive.

[0024] Reduce the acidity of the system: Zinc, as a slower gelation catalyst and better adhesion catalyst, can reduce the acidity of the system and further accelerate the curing process in the later stage of the reaction.

[0025] Accelerate late cross-linking and curing: By properly adjusting the ratio of zinc and bismuth, the induction period can be extended and the late cross-linking and curing can be promoted, thereby improving the final performance of the adhesive.

[0026] Furthermore, in order to make the bottom surface of the ETPU shock-absorbing shoe midsole more wear-resistant and have a better anti-slip effect, the ETPU shock-absorbing shoe midsole and the rubber outsole are integrally molded to form a complete sole.

[0027] The above embodiments are only preferred implementation modes of the present invention and should not be used to limit the scope of protection of the present invention. Any changes or modifications that are made to the main design concept and spirit of the present invention and have no substantive significance, as long as the technical problems they solve are still consistent with the present invention, should be included in the scope of protection of the present invention.

Claims

1. A method for preparing an ETPU shock-absorbing shoe midsole, characterized in that: The steps include: Step 1: Mixing the adhesive solution: Pour a certain amount of adhesive, chain extender and catalyst into a container and stir to mix evenly to obtain an adhesive mixture for use; Step 2: Pour the adhesive mixture and ETPU particle raw material in step 1 into a mixing bucket and stir evenly until each ETPU particle raw material is coated with adhesive to obtain a mixed material for standby use; Step 3: prepare a mold, clean the impurities in the mold, and blow dry it with an air gun. The mold can be a midsole mold or an outsole mold; Step 4: Close the mold, quickly pour the mixed material in step 2 into the mold, and quickly close the mold; Step 5: Heating: Heat the mold after closing the mold in step 4 at 70°C for 6 minutes to shape the mixed material in the mold; Step 6: After the mold heated in step 5 cools naturally, take out the finished product to obtain the ETPU shock-absorbing shoe midsole.

2. A method for preparing an ETPU shock-absorbing shoe midsole according to claim 1, characterized in that: The weight ratio of the adhesive mixture to the ETPU particle raw material is 1:

9.

3. A method for preparing an ETPU shock-absorbing shoe midsole according to claim 1, characterized in that: The weight ratio of the adhesive, the chain extender and the catalyst is 1000:3:

3.

4. A method for preparing an ETPU shock-absorbing shoe midsole according to claim 1 or 3, characterized in that: The adhesive is polyether polyol.

5. A method for preparing an ETPU shock-absorbing shoe midsole according to claim 1, characterized in that: The chain extender is chain extender E-100.

6. A method for preparing an ETPU shock-absorbing shoe midsole according to claim 1, characterized in that: The catalyst is polyurethane organotin catalyst T9.