Pouring molding process for thermoplastic elastomer foam particles

A thermoplastic elastomer and foam particle technology, which is applied in the field of foam material product preparation, can solve the problems of difficult direct bonding, insufficient peel strength, insufficient compatibility, etc., and achieves improved elastic support effect, improved connection firm effect, The effect of reducing energy consumption

Active Publication Date: 2018-12-25
NANTONG DE NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the performance defects of some thermoplastic elastomer foamed particles (such as polyether ester TPEE, polyamide PA), the melting temperature of the outer skin is high, but when the outer skin is melted, the melt strength of the cell wall inside the foamed particle is very low, making heat sealing During the process, when the heat sealing temperature is low, the outer skin of the foamed particles is not softened or melted, so that they cannot be effectively bonded together, and the bonding strength is low. It also melts away and the cells collapse or the cells burn through, which cannot be shaped and has defects in appearance
In this way, the demand for foamed particles to be glued into foamed products began to arise, but the existing glue mostly uses solvent glue, which is strictly restricted by the national environmental protection requirements.
Reactive gluing is widely sought after due to its environmental protection characteristics, but the adhesive strength of reactive gluing and foame

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of reactive polyurethane glue:

[0031] Component A: polyols of adipic acid and ethylene glycol condensation reaction, molecular weight 800-3000, 85 parts; trihydroxyl or tetrahydroxyl polymer as crosslinking agent, 1 part; water, 3 parts;

[0032] Component B: prepolymer produced by polyester polyol and isocyanate, the remaining unreacted NCO content is 20-30%;

[0033] C component: catalyst, antioxidant, UV absorber, stabilizer, release agent and other functional additives.

[0034] (2) Pouring molding process:

[0035] (2-1) The thermoplastic elastomer TPEE foamed particles are poured into the shoe mold;

[0036] (2-2) Using the shoe sole stock solution casting process, respectively heat-melt component A and add it to metering tank A, add component C to metering tank A and mix well, and heat-melt component B and add it to metering tank B; Through the metering pump and mass flowmeter of each metering tank, each component is accurately delivered to t...

Embodiment 2

[0046] Compared with Example 1, except that the TPEE expanded particles in this example are prepared by referring to the method in ZL201710660163.6, the rest are the same.

[0047] Finally, the obtained shoe material midsole products are firmly bonded and fastened, and the measured peel strength is generally greater than 2.2kgf / cm, and the peel strength of some products is even above 3kgf / cm.

Embodiment 3

[0049] Compared with Example 1, except that the reactive polyurethane glue in this example is a conventional commercially available product, the rest are the same.

[0050] Finally, the obtained midsole product of shoe material is bonded firmly, and its peeling strength is measured to be greater than 2kgf / cm.

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Abstract

The invention relates to a pouring molding process for thermoplastic elastomer foam particles. Thermoplastic elastomer foam particles with closed pore structures in composition with open pore structures extending to the epidermis are taken as a raw material; then the thermoplastic elastomer foam particle raw material is loaded into a molding mold, reactive polyurethane adhesive is injected, hot pressing, cooling molding are carried out, and a molding product is obtained. Compared with the prior art, according to the pouring molding process for the thermoplastic elastomer foam particles, through production process innovation of the bead-shaped thermoplastic elastomer foam particles, appropriate foam hole structures are designed, at the same time, functional groups or polar groups are contained, in addition, further through the unique foam particle surface treatment process, the particles obtained by foaming of various thermoplastic elastomers can be directly poured and bonded with polyurethane elastomers or can be directly poured and bonded with foamed polyurethane elastomers to form sole materials with the unique physical property and the unique appearance and other foaming products.

Description

technical field [0001] The invention belongs to the technical field of foam material product preparation, and relates to a thermoplastic elastomer foam particle pouring molding process. Background technique [0002] At present, foamed thermoplastic elastomer particles are widely used as the midsole of shoe materials in shoe materials and other fields. This kind of midsole finished product can realize light weight, effective rebound feedback, and realize cost and material saving. However, the preparation process of the above-mentioned foamed product is basically a particle mold heat-sealing process, and the heating medium for heat-sealing is low-pressure steam, and the steam is usually 1.2-3.5kg / cm2, 120-240°C. [0003] Due to the performance defects of some thermoplastic elastomer foamed particles (such as polyether ester TPEE, polyamide PA), the melting temperature of the outer skin is high, but when the outer skin is melted, the melt strength of the cell wall inside the fo...

Claims

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Application Information

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IPC IPC(8): B29C44/04B29C44/34C08G18/42
CPCB29C44/04B29C44/3461C08G18/4238
Inventor 陈乔健郭杨龙
Owner NANTONG DE NEW MATERIAL CO LTD
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