Method for preparing high-intensity covalence/ion interpenetrating polymer network easily molded gel

Abstract

The invention provides a method for preparing high-intensity covalence / ion interpenetrating polymer network easily molded gel, belonging to the field of functional polymers. The method comprises the following steps: mixing acrylamide with good biocompatibility and sodium alginate, uniformly stirring, reacting with a chemical cross-linking agent, polyvinylpyrrolidone and an initiator, under the action of the chemical cross-linking agent, forming a polyacrylamide gel network from acrylamide, forming semi-interpenetrating polymer network gel when sodium alginate penetrates through the polyacrylamide gel network, and performing aftertreatment by using a polyvalent metal salt solution, thereby forming the interpenetrating polymer network gel. The polyacrylamide / sodium alginate interpenetrating polymer network gel prepared by using the method is high in tensile strength, good in tension resilience, uniform in structure, good in molding property, and can be used in fields such as intelligent and self-repairing type functional textiles, medical textiles, printing wastewater dye collection, and the like.

Description

technical field [0001] The invention relates to a preparation method of a high-strength covalent / ion interpenetrating network easy-to-shape gel, which belongs to the field of functional polymers. Background technique [0002] Polymer hydrogel can be swollen but insoluble in water. It is a kind of hydrophilic three-dimensional network polymer and can be used as the matrix of functional materials such as moisture absorption, water retention, softness, and slow release. The mechanical properties of gels prepared by traditional methods have always been the main factor restricting the wide application of gels, especially as loading materials, gels need to have sufficient strength. Improving gel strength through nanocomposite (NC), topological structure (TP), and interpenetrating network (IPN) has attracted extensive attention and exploration of researchers. Among them, IPN technology is considered to be a new technology to realize physical blending by chemical method. Due to the...

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Problems solved by technology

[0003] Chinese patent ZL200810036459 uses sodium pyrophosphate modified lithium bentonite as an inorganic crosslinking agent, and the highest tensile strength of the PNIPAM / PAM interpenetrating network gel prepared by two-step interpenetration can reach 300kPa, but due to the gel prepared in the first step The mechanical properties of the network are low and fragile, and it is difficult to achieve the purpose of processing and forming by designing molds with complex shapes before the second step of polymerization

Chinese patent CN200710008807 discloses a new preparation method of interpenetrating network gel formed by pre-polymerization of water-soluble monomers. The strength of the gel prepared by this method can reach 1.22MPa. However, the structure of the gel prepared by this method is not uniform and The degree of prepolymerization reaction in the first step is difficult to control