Production process of SEBS rubber bra pad foaming material

Abstract

The invention relates to a production process of an SEBS rubber bra pad foaming material. A foaming agent is added into a charging barrel of an injection molding machine; inert gas micro-foaming is carried out by a microcellular foaming injection device; then, the temperature is naturally increased to 170 DEG C to 210 DEG C through high-pressure and high-speed movement of rubber SEBS, and the rubber SEBS is saturated and foamed; therefore, the foamed rubber SEBS after foaming has the advantages of aging resistance, low temperature resistance, compressive deformation resistance, high plasticity, high toughness and the like; the density of the rubber SEBS is quite low, and the conditions for manufacturing a healthy bra pad are completely met, so that the prepared rubber elastic bra pad can be shaped, has no obvious weight feeling, is lighter and more comfortable, does not need vulcanization, does not contain any toxic substances, and better meets the health requirements.

Description

technical field [0001] The invention relates to a preparation method of a polymer material, in particular to a production process of a SEBS rubber bra liner foam material. Background technique [0002] Bras are used to protect women's health and make breasts more beautiful. Present bra great majority uses molding sponge as liner, and women can increase its charm to a certain extent after wearing it. But there are many deficiencies in this bra with the sponge as the pad, mainly in: the poor air permeability of the sponge pad, after wearing this bra, there will be stuffy feeling or cause skin discomfort, this situation is more serious in summer, although there are also some Some of the sponge pads are punched to enhance air permeability, but the punched sponge pads are easily deformed and damaged; due to the poor elasticity of the sponge, they are easily deformed and damaged, so this kind of bra cannot be rubbed and washed, which affects the cleanliness of the bra . [0003...

AI Technical Summary

Problems solved by technology

[0009] First of all, the formulas with the above-mentioned publication numbers CN109251464A, CN108676310A, etc. are composite materials, that is, mixed materials. After foaming, the strength is high, hard, and the flexibility is not enough, so it cannot be applied to the foaming of the elastic rubber breast pad body;

[0010] Secondly, with the help of vulcanization treatment, it is toxic and not suitable for close-fitting elastic rubber chest pads;

[0011] Third, the gun temperature is 78-100°C, the mold temperature is 165-200°C, and the vulcanization time is 5-15min. The semi-molten SEBS rubber in the gun is not foamed, but heated to 165-200°C in the mold. It is melted at 200°C and foamed by vulcanization. It is difficult for the molten rubber in the mold to achieve a consistent temperature, and the local temperature is difficult to control. For example, the peripheral part directly in contact with the mold is often too high in temperature, causing the gas emitted by the foaming agent to separate from the molten rubber. And escape, insufficient foaming, the temperature of the middle part is lower than the decomposition temperature of the foaming agent, resulting in insufficient foaming, all of which lead to the inability to produce SEBS foaming materials with uniform foaming density, and it is difficult to use them on elastic rubber chest pads. Application, can only be used as plate, shoe sole and other lower requirements

[0012] Fourth, the above-mentioned foaming process simply uses a foaming agent for foaming, and it is difficult to achieve the purpose of uniform foaming; in other mechanical foaming, some simply use inert gas foaming, and it is difficult to maintain a complete and sufficient foaming during the entire injection molding process. Foaming state, also leads to uneven foaming density

[0013] To sum up, there is currently no better process for foaming SEBS rubber and making it into foamed elastic rubber chest pads

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