Polyvinyl-alcohol imbibition sponge material and preparation method thereof

Abstract

The invention discloses a polyvinyl-alcohol imbibition sponge material and a preparation method thereof. The method comprises the steps of firstly, mixing polyvinyl alcohol and distilled water, and dissolving in water bath with the temperature of 50-95 DEG C, so as to obtain a polyvinyl-alcohol aqueous solution; adding a cross-linking agent, a catalyst, a foamer, a pore filling agent and an auxiliary foamer into the polyvinyl-alcohol aqueous solution, and uniformly stirring and mixing in water bath with the temperature of 30-80 DEG C; pouring a uniformly-mixed emulsion into a mold, and carrying out crosslinking reaction at the temperature of 30-90 DEG C; reacting for 30-60 minutes, after pores are formed, maintaining the temperature, and further heating to solidify for 2-8 hours, thereby obtaining the polyvinyl-alcohol imbibition sponge material. The sponge is uniform in pore, strong in water absorbing power, good in flexibility and viscoelasticity and good in biocompatibility, has the advantages of low cost, environment friendliness, simple process and the like, and has broad prospects for development in the fields of aquatic product processing, food, clinical medicine, water treatment and the like.

Description

technical field [0001] The invention relates to a liquid-absorbing sponge material, in particular to a novel polyvinyl alcohol liquid-absorbing sponge material and a preparation method thereof. Good, good flexibility and viscoelasticity and good biocompatibility. technical background [0002] The polyvinyl alcohol liquid-absorbing sponge material has the following excellent properties: 1) Strong water absorption capacity due to the hydrophilic group in the molecular structure; 2) The sponge has good flexibility and resilience; 3) Hydrophilicity and alkali resistance Good durability, wear resistance, creep resistance, and freeze-thaw resistance; 4) Stable to oxygen and ultraviolet rays, and not easy to age. Therefore, it is widely used in the fields of electronics industry, daily cleaning, medical and sanitation, kitchen and bathroom, building materials and so on. With the rapid economic development in recent years and people's continuous pursuit of a comfortable and health...

AI Technical Summary

Problems solved by technology

For example, U.S. Patent No. 4,098,728 discloses a medical polyvinyl alcohol sponge that is prepared by entraining air by mechanical stirring alone. The pore size is controlled by the amount of surfactant and the stirring speed. Although the purity of the sponge is very high, the pore connectivity is not high. Low density and compressive elasticity, severe molding shrinkage, difficult to control pore size

[0006] In the patent documents published above, one is to obtain sponge body by foaming with starch filling method, and the other is to obtain sponge body by filling and foaming by mixing gas or adding gas that can react and release gas; the former consumes a lot of water due to starch cleaning problems, On the other hand, it is difficult to clean thoroughly, which affects product quality and restricts its use in high-end fields; in the latter case, if the process control is not good, the product yield will be very low

[0007] The inventor's research team once disclosed the use of physical foaming agents to prepare sponges (Luo Zhibo, Lin Chuangfa, Wen Xiufang, Cai Zhiqi. Preparation and performance research of PVA formal water-absorbing sponges [J]. Plastic Industry, 2012, 40(8) :77-80.), although the above-mentioned second problem is partially solved, because only formaldehyde is used as the cross-linking agent, the obtained sponge has low cross-linking density and poor resilience, and the problem of starch cleaning is not solved, thus limiting Its scope of application

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