Composite slowly-recoverable soft polyurethane foam and preparation method thereof

Abstract

The invention discloses composite slowly-recoverable soft polyurethane foam and a preparation method thereof. The composite slowly-recoverable soft polyurethane foam is prepared from a component A and a component B; isocyanate is adopted as the component A; the component B is prepared from 40%-70% of b1, 20%-40% of b2, 0-30% of b3, 0.1%-20% of b4, a foaming agent accounting for 1%-5% of the total amount of a polyether component, a foam stabilizer accounting for 0.2%-3% of the total amount of the polyether component and a catalyst accounting for 0.2%-5% of the total amount of the polyether component, wherein the polyether component is prepared from b1, b2, b3 and b4, and b1+b2+b3+b4=100; PO-EO copolymerized polyether polyol or polypropylene oxide of which the mass content of epoxypropane is more than 90% and the functionality degree is 3 when the amount is within 200-350 is adopted as b1; PO-EO copolymerized polyalcohol of which the mass content of epoxypropane is more than 50% and the functionality degree is 3 when the amount is more than 1000 is adopted as b2; PO-EO copolymerized polyalcohol of which the mass content of PO is more than 80%, the functionality degree is 3 and the primary hydroxyl content is more than 70% when the amount is more than 1000 is adopted as b3; PO-EO copolymerized monohydric alcohol of which the mass content of EO is more than 75% when the amount is more than 1000 is adopted as b4. The composite slowly-recoverable soft polyurethane foam has the dual characteristics of structural-type slow recovery and air bag-type slow recovery, and the slow recovery of the foam is little in dependence on an isocyanate index and the usage amount of slowly-recoverable polyether.

Description

technical field [0001] The invention belongs to the field of soft polyurethane foams, in particular to soft slow-rebound polyurethane foams. Background technique [0002] Slow rebound polyurethane flexible foam is also called memory foam, which is characterized by slow recovery after being deformed by force, and the recovery time can reach tens of seconds or even hundreds of seconds. This unique feature enables the slow-rebound foam to conform to the shape of different parts of the human body, maximize the contact area with the human body, minimize the stress gradient, relieve the stress concentration point, and have no local extrusion and tingling sensation, which is beneficial to the human body. blood circulation. Therefore, slow-rebound foam is widely used in various cushion materials, and it is more comfortable than traditional soft foam. Another characteristic of slow rebound foam is damping, which has good sound-absorbing and shock-absorbing properties, and is also u...

AI Technical Summary

Problems solved by technology

[0007] The first technical problem to be solved by the present invention is to provide a composite slow-rebound polyurethane soft foam, which has dual slow-rebound characteristics of "structural slow-rebound" and "airbag-type slow-rebound". The slow rebound material has low dependence on the isocyanate index and the amount of slow rebound polyether, and it still shows obvious slow rebound characteristics under the condition of high isocyanate index and low slow rebound polyether dosage, so as to solve the problem of traditional slow rebound The material has defects such as strong foam temperature dependence, poor durability and mechanical properties, and insufficient load-bearing capacity due to excessive use of slow-rebound polyether and low isocyanate index

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