Fast absorption type water-absorbent resin and preparation method thereof

Abstract

The invention discloses fast absorption type water-absorbent resin and a preparation method thereof, and belongs to the technical field of water-absorbent resin. After a neutralization reaction is carried out, a microsphere foaming agent is added into a neutralization solution, the microsphere foaming agent releases heat and generates gas through a polymerization reaction, and a glue block swellsby several times under the action of the gas; then pelleting, drying and smashing are carried out, and the fast absorption type water-absorbent resin is obtained after surface crosslinking is carriedout. According to the fast absorption type water-absorbent resin and the preparation method thereof, operation is easy, the manufacturing process is easy to control, and the production period is short; the obtained water-absorbent resin is high in absorption speed and small in reverse osmosis, particles obtained after water absorption are high in strength and loose, and the fast absorption type water-absorbent resin is especially suitable for composite core paper diapers and sanitary towels.

Description

technical field [0001] The invention relates to the field of water-absorbing resins, in particular to a fast-absorbing water-absorbing resin and a preparation method thereof. Background technique [0002] Super Absorbent Polymer (SAP) is a new type of functional polymer material with a large number of hydrophilic groups. It has a high water absorption function of absorbing water hundreds to thousands of times heavier than itself, and has excellent water retention performance. Once it absorbs water and swells into a hydrogel, it is difficult to separate the water even if it is pressurized. Water-absorbing resins are widely used and have a very broad application prospect. The main purpose is mainly sanitary materials, accounting for about 70% of the total market. [0003] Water-absorbent resins are mainly used in sanitary products such as diapers, sanitary napkins, breast pads, mattresses, etc. The amount of water-absorbent resin in paper diapers accounts for more than 80% ...

AI Technical Summary

Problems solved by technology

[0004] The wood pulp core (also known as fluff pulp, traditional core) is composed of fluff pulp and water-absorbing resin mixed in disorder, not layered, and the structure is relatively loose. The wood pulp core combs the fluff pulp to guide urine into the absorption Inside the core, the urine is absorbed by the water-absorbing capacity of the water-absorbent resin. Because the fluff pulp has good hydrophilicity and excellent drainage properties, the water absorption speed of the wood pulp core diaper is fast; but the fluff pulp will expand rapidly after absorbing water. , compared to composite core diapers, which are thicker, so wood pulp core diapers have the problem of easy fracture and upturning after absorbing water; resulting in poor air permeability of diapers, and the fault surface is not absorbent, resulting in uneven absorption of diapers

[0005] The composite core is a layered structure, mainly composed of water-absorbing resin and fluffy non-woven fabric. The water-absorbing resin is placed on the upper and lower sides of the fluffy non-woven fabric, and the urine is guided through the fluffy non-woven fabric layer to absorb the water-absorbing resin. The composite core The body uses a large amount of water-absorbing resin to ensure the water absorption of diapers, but because of the layered structure, the overall expansion after absorbing water has the advantages of continuous layers and no lumps; but the hydrophilicity of fluffy non-woven fabrics is not as good as that of fluffy pulp. , so the absorption rate of the composite core of diapers is much slower than that of the wood pulp core, that is, the composite core cannot diffuse quickly when it absorbs urine locally, and the urine capacity of this part will increase rapidly, which is prone to side leakage and reverse osmosis affect the dryness of the composite core after absorption

[0006] The semi-core is a new type of core that combines wood pulp core and composite core. It is still in the development stage, so it is not commonly used in the market.

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