Polyurethane foam with ultralow surface hardness and high press-to-sink ratio and preparation method thereof

Abstract

The invention discloses polyurethane foam with ultralow surface hardness and a high press-to-sink ratio. The foam is prepared from a component A and a component B. The component A is prepared from 37-50 parts of polyhydric alcohol 1, 25-50 parts of polyhydric alcohol 2, 0-30 parts of polyhydric alcohol 3, 0-10 parts of polyhydric alcohol 4, 0-18 parts of polyhydric alcohol 5, 0.7-2 parts of surface active agent, 0.4-0.7 part of composite catalyst, 0-5 parts of amine-terminated polyether and 2.5-4 parts of foaming agent. The component B is prepared from 26-42 parts of isocyanate. Polyhydric alcohol 1 is oxirane and epoxypropane copolymerized polyhydric alcohol, polyhydric alcohol 2 is epoxypropane polyether polyol, polyhydric alcohol 3 is allyl alcohol polyether polyol, polyhydric alcohol 4 is vegetable oil polyether polyol, polyhydric alcohol 5 is oxirane end capped epoxypropane polyether polyol, and isocyanate is diphenylmethane diisocyanate. The polyurethane foam has ultralow surface hardness, extremely good supporting performance, the high press-to-sink ratio, and hydrophilia insensitive to temperature changes.

Description

technical field [0001] The invention relates to the field of polyurethane, in particular to a polyurethane foam with ultra-low surface hardness and high sag ratio and a preparation method thereof. Background technique [0002] In the prior art, polyurethane products, especially polyurethane pillow mattresses, are basically divided into two types, slow rebound memory foam and high resilience cushion cotton. Slow rebound memory foam usually has high temperature sensitivity, and the rebound time varies. Different, high permanent compression set rate and other issues. Although the high-resilience series solves the problems of permanent compression deformation and temperature sensitivity, it loses its memory, feels rough, has too high surface hardness, and greatly reduces comfort. Generally, we think that the lower the hardness of the pillow, the weaker the compression on the human cervical spine, and the higher the comfort level. The pillows with lower hardness in the prior art...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, polyurethane products, especially polyurethane pillow mattresses, are basically divided into two types, slow rebound memory foam and high resilience cushion cotton. Slow rebound memory foam usually has high temperature sensitivity, and the rebound time varies. Different, high permanent compression set rate and other issues

Although the high-rebound series solves the problems of permanent compression deformation and temperature sensitivity, it loses its memory, feels rough, and the surface hardness is too high, which greatly reduces the comfort.

Generally, we think that the lower the hardness of the pillow, the weaker the compression on the human cervical spine, and the higher the comfort level. The pillows with lower hardness in the prior art usually get poor support at the same time, although the compression on the cervical spine is small. , but because the indentation ratio is also greatly reduced at the same time, once the pillow is pressed to the bottom, it loses the function of the pillow itself to support the human cervical spine

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