Modified high-blood-absorption polyurethane sponge as well as preparation method and application thereof

Abstract

The invention provides a modified high-blood-absorption polyurethane sponge as well as a preparation method and application thereof. The polyurethane sponge is prepared from the following raw materials: isocyanate, polyol, super absorbent resin, fluff pulp, cationic polysaccharide, water, a hydrophilic surfactant, a chain extender, an inorganic filler and an antioxidant. The prepared polyurethanesponge has the advantages of being high in liquid guiding performance, high in absorption foam utilization rate, high in blood absorption capacity, low in blood reverse osmosis rate, low in swelling rate after blood absorption and the like, high strength of the sponge can be maintained after blood absorption, and the polyurethane sponge is suitable for the field of disposable blood absorption hygienic products such as sanitary towels and medical dressings.

Description

technical field [0001] The invention relates to the field of polyurethane foam material products, in particular to a modified high blood-absorbing polyurethane sponge, a preparation method and its application in the medical and health field. Background technique [0002] With the improvement of people's living standards, people's demand for disposable sanitary products has gradually increased, and higher requirements have been put forward for the quality of disposable sanitary products. With the industrialization of acrylic-based superabsorbent resins, superabsorbent disposable sanitary products (including feminine hygiene products, baby diapers, etc.) filled with superabsorbent resins have developed rapidly, but there are many problems in the conventional carrier of superabsorbent resins, including dispersion Uneven, easy to cause problems such as gel clogging and poor comfort after absorbing liquid. At the same time, with the diversification of user experience, people's d...

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Problems solved by technology

However, it uses organotin as a catalyst and dichloromethane as a blowing agent, and the residues of the two chemicals will increase biological toxicity and affect its application in the medical and health field

[0004] Invention patent CN 110577627A discloses a method for preparing an absorbent material with high absorption capacity. The polyols used in this method are all polyether polyols. The obtained polyurethane foam will swell severely after sucking blood, and its mechanical properties will drop significantly. Affect the user experience; at the same time, the material has poor degradability, and the swelling is serious after absorbing blood, and the mechanical properties drop significantly after absorbing blood

Large porosity, poor absorption performance, unable to overcome gravity to effectively distribute fluid, resulting in poor liquid permeability of foam, low absorption utilization rate, and poor absorption effect

Secondly, excessive fluid confinement interacts with SAP particles and polyoxyethylene segment soft segments, resulting in severe local expansion after fluid absorption and rapid strength decline, which affects its application and promotion in the field of hygiene products

[0008] 2) Polyurethane foam containing SAP has poor blood absorption

At present, SAP-containing polyurethane high-absorbency foam can effectively absorb simple fluids such as water and urine, but blood, a complex fluid, contains dissolved organic matter such as blood cells and proteins, metal ions, etc.; blood cells and proteins will cause the fluid to have a high viscosity. At the same time, after absorption, it covers the surface of the absorber to inhibit further blood absorption; metal ions coordinate with the surface of the absorber, causing the absorber to lose its absorbing capacity, which greatly affects the ability of the foam absorber to absorb and store blood, resulting in utilization. Low and poor usability

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