Continuous preparation method for reinforced hollow fiber membrane with spongy structure

Abstract

The invention discloses a continuous preparation method for a reinforced hollow fiber membrane with a spongy structure. The continuous preparation method comprises the following steps: 1) weaving fiber filaments into a hollow tube by using a two-dimension weaving technology to serve as a reinforcement body; 2) uniformly mixing toluene diisocynate and polyether polyol to obtain a mixture marked as a component A, uniformly mixing polyether polyol, an organic metal tin catalyst and organic silicone oil to obtain a mixture marked as a component B, and preparing an amine catalyst aqueous solution of which the concentration is 0.01-0.04 percent and which is marked as a component C; 3) extruding the reinforcement body, the component B and the component A in sequence from an annular spinning jet according to a skin / core composite spinning process to obtain a basic membrane; 4) solidifying and curing the basic membrane through an atomizing component C region and a spinning heating channel in sequence under the traction action of a guide roller, so as to obtain the reinforced hollow fiber membrane with the spongy structure. By adopting the method, the reinforced hollow fiber porous membrane with the spongy structure is prepared according to a sponge foaming principle; the membrane is uniform in micro-pore size, and high in porosity.

Description

technical field [0001] The invention relates to the field of special separation technology, in particular to a continuous preparation method of a reinforced sponge structure hollow fiber membrane. Background technique [0002] The chemical structure of the membrane material is the basic condition for the industrialization of the microporous membrane, and the permeability and selectivity of the membrane are directly related to the micropore shape. Micropore morphology includes pore size, shape, porosity, pore size distribution, and three-dimensional arrangement, all of which depend on the formation process of the microporous structure. In addition, the cost of the membrane and the repeatability of the preparation method are also closely related to the method of forming the micropores. [0003] The traditional film-forming pore-forming methods mainly include the following: (1) Additive dissolution pore-forming method: Add appropriate soluble substances as pore-forming agents ...

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Problems solved by technology

[0004] Polyurethane sponge is widely used in production and life due to its excellent performance. However, the defects of polyurethane foam itself, such as low modulus and low compressive strength, greatly limit the application of polyurethane. Patent CN101543731A discloses a braided tube reinforced The preparation method of the hollow fiber membrane is to weave the fiber into a hollow fiber braided tube first, and then co-extrude it with the casting liquid to form a membrane in a coagulation bath. This method can also effectively enhance the strength of the membrane

The synthesis process of polyurethane foam mainly includes the following reactions: chain extension reaction between polyfunctional polyether and dibasic or polybasic organic isocyanate, foaming reaction between water and organic isocyanate, polyurethane foam plastic in There are three synthetic methods in industrial production: prepolymer method, semi-prepolymer method and one-step method, but there is no report on the method of preparing reinforced sponge structure hollow fiber membrane by polyurethane foaming method

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