Waterborne emulsified EVA memory-type foamed plastic and preparation method of product thereof

Abstract

The invention discloses a waterborne emulsified EVA memory-type foamed plastic and a preparation method of a product thereof; the foamed plastic comprises the following main composition components: 38-58% of hydrophilic PU prepolymer, 8-22% of waterborne emulsified EVA, and 8-20% of polyether polyol, wherein the PU prepolymer comprises 40-70% of polyether polyol and 30-60% of isocyanate, the polyether polyol has a molecular weight of 60-1800, and at least has more than 40 mol% of ether groups (-EO-), and the ether group (-EO-) content is 18-99.9%. The PU foamed plastic of the invention has a special hydrophilic high-molecular structure, not only has good shock absorption and average pressure relief, but also has hygroscopicity, heat absorptivity, and low temperature resistance, realizes drying and cooling effect when contacting human body, does not harden below a temperature of 10 DEG C, and improves the comfort level for contacting between the foamed plastic and human body, and the application scope.

Description

technical field [0001] The invention relates to a hydrophilic EVA foam and a preparation method thereof, in particular to a hydrophilic EVA foam with multiple functions such as good shock absorption, average pressure release, hygroscopicity, heat absorption, low temperature resistance and non-toxicity. Water-based EVA memory foam and a preparation method thereof. Background technique [0002] As far as the technical field of PU (polyurethane) foam is concerned, PU foam has been widely used in products such as pillows, medical mattresses, office chair cushions, bedding mattresses or shoe materials, and there are already average pressure relief foams on the market. (uniform pressure relief) PU memory foam (memory foam), and the conventional PU memory foam system utilizes polyether polyol (polyether polyol) 0.5-90% and isocyanate (Isocyanate) 2-60% and Its acrylic resin (Acrylic resin) 0.5 ~ 50%, first mix evenly at room temperature, and then pass through the carbon dioxide (C...

AI Technical Summary

Problems solved by technology

[0003] The known PU memory foam is non-hydrophilic (hydrophobic) PU foam, so it does not have obvious hydrophilic (hydrophilic) characteristics, that is, it does not have obvious moisture absorbing (moisture absorbing) and heat absorption Thermo absorbing, when in contact with the human body, the moisture and heat generated by the human skin at the contact surface cannot be effectively dissipated, resulting in rapid heat storage at the contact surface, and it is impossible to achieve dryness (moisture absorption) and coolness (heat absorption) effect, which greatly affects the user's comfort and is not conducive to the applicability of foam

[0004] Although the conventional PU memory foam has considerable softness, the softness does not have low temperature resistance. Therefore, the conventional PU memory foam is sensitive to temperature and will gradually harden when the temperature is below 10°C. When the ambient temperature is lower than 5°C, it may be as hard as wood. Therefore, when used in cold areas, it must be warmed up (turn on the heater) for a period of time to have a soft effect. As a result, the ambient temperature is limited, which relatively affects the foam. Application range

[0005] Conventional memory foam has poor oxidation resistance and hydrolysis resistance, which relatively affects the service life of the foam

[0006] As far as the reaction is concerned, it is known that the non-hydrophilic (hydrophobic) PU memory foam has a very high content of TDA (Toluene diamine) or MDA (Methylene diphenyl diamine), which has toxic effects; and the foam after molding It still contains residual ammonia (amine) catalyst, which will have a pungent smell, which is not conducive to use as pillows, mattresses or cushions

Moreover, the durability of general latex foam is not high, and it is easy to be oxidized or powdery due to the influence of perfume and alcohol (alcohol).

[0007] Therefore, the application of conventional non-hydrophilic PU memory foam, especially in products such as pillows, medical mattresses, bedding mattresses, etc., cannot meet the quality, function and comfort requirements of consumers. , causing confusion for consumers

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