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A kind of preparation method of double network hydrogel fiber and its product

A gel fiber and hydrogel technology, which is applied in fiber treatment, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems of poor toughness of water-absorbing gel fibers, difficult fiber processing, and brittle compression, etc., to achieve strong water absorption and Water retention capacity, good toughness in dry state, and fast crosslinking speed

Active Publication Date: 2017-01-04
THE HONG KONG POLYTECHNIC UNIV
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  • Description
  • Claims
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the above-mentioned water-absorbing gel fibers in the prior art have poor toughness, low elasticity, are easy to break when stretched, and are fragile when compressed. They need to be blended with other supporting fibers, which brings difficulties to the subsequent processing of the fibers. The present invention adopts the technology of combining ion cross-linking and ionizing radiation cross-linking to construct a uniformly distributed double-network structure inside the fiber in situ, and prepare a high-toughness double-network hydrogel fiber, which has good toughness in dry state. It can be spun alone, has strong water absorption and water retention capacity, and has good biocompatibility and strong salt resistance

Method used

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  • A kind of preparation method of double network hydrogel fiber and its product

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preparation example Construction

[0028] A preparation method of double-network hydrogel fibers, comprising the following steps:

[0029] (1) Preparation of spinning dope:

[0030] One or more water-soluble natural polysaccharides and water-soluble acrylamide polymers are dissolved in water, stirred evenly, and then filtered and defoamed to obtain a certain viscosity and containing 1-8% (mass percentage) natural polysaccharides. A mixed spinning solution of polysaccharide and 4-30% (mass percent) acrylamide polymer, wherein the mass ratio of natural polysaccharide to acrylamide polymer is 1:1-1:10;

[0031] Wherein, the natural polysaccharide is alginate, carrageenan (kappa type carrageenan, Iota carrageenan), agar or konjac flour and the like. The number average molecular weight of the acrylamide polymer is 50000-6000000; the acrylamide polymer is any one of anionic polyacrylamide, cationic polyacrylamide, nonionic polyacrylamide or amphoteric polyacrylamide.

[0032] The anionic polyacrylamide mainly inclu...

Embodiment example 1

[0043] Weigh a certain amount of sodium alginate and polyacrylamide (molecular weight: 2,000,000-2,500,000), stir rapidly and dissolve in water at room temperature, filter, and defoam under reduced pressure to prepare a textile containing 2% sodium alginate and 12% polyacrylamide. Silk stock solution, wherein the mass ratio of sodium alginate to polyacrylamide is 1:6. By dry-wet spinning, the spinning stock solution is spun into 80%wt ethanol aqueous solution containing 5%wt calcium sulfate with a speed of 30m / min and coagulated into as-spun fibers, wherein the air layer distance is 2cm, and the barrel temperature is kept At about 70°C, the temperature of the coagulation bath is about 25°C, and the ratio of pulling speed to spinning speed is 1.5:1. Then, the primary fibers are bundled and drawn into a cobalt source ( 60 Co) irradiation device for continuous irradiation cross-linking with a total irradiation dose of 50kGy. A high-toughness double network hydrogel fiber was pr...

Embodiment example 2

[0045] Weigh a certain amount of Iota-type carrageenan and polyacrylamide (molecular weight: 5,000,000-6,000,000), stir rapidly and dissolve in water at 70°C, filter, and defoam under reduced pressure to obtain 2% Iota-type carrageenan and 8% polyacrylamide The spinning dope of acrylamide, wherein the mass ratio of carrageenan to polyacrylamide is 1:4. The spinning dope was spun into 50%wt ethanol aqueous solution at a speed of 30m / min by gel spinning, and solidified into nascent fibers. Among them, the temperature of the barrel is kept at about 70°C, the temperature of the coagulation bath is about 0°C, and the ratio of the pulling speed to the spinning speed is 1.5:1. Then, the as-spun fibers were bundled and drawn into an electron beam irradiation device for continuous irradiation cross-linking with a total irradiation dose of 10 kGy. Finally, a high-toughness double network hydrogel fiber was prepared through the subsequent processes of drawing, heat setting and winding, ...

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Abstract

The invention discloses a preparation method of a double-net hydrogel fiber and a product thereof. The preparation method mainly includes following steps: (1) preparation of a spinning raw solution: dissolving one or more water-soluble natural polysaccharides and a water-soluble acrylamide polymer in water with stirring uniformly, and performing filtration and defoaming to obtain a mixed spinning raw solution containing the natural polysaccharides and the acrylamide polymer; (2) preparation of a water-containing primary gel fiber: performing wet spinning, or dry-wet spinning or gel spinning to the mixed spinning raw solution prepared in the step (1), performing a spinning process at a preset speed, mixing the mixed spinning raw solution with a coagulating bath, to obtain the water-containing primary gel fiber; and (3) radiation crosslinking: drafting the primary gel fiber into an ionizing radiation apparatus and performing the radiation crosslinking to the primary gel fiber prepared in the step (2), and performing a subsequent drafting operation, a thermal-moulding operation, a winding-up operation and a fiber-cutting operation to obtain the double-net hydrogel fiber.

Description

technical field [0001] The invention relates to the field of polymer material processing, and more specifically relates to a preparation method of double-network hydrogel fibers and products thereof. Background technique [0002] At present, there are two main types of hydrogel fibers, one is superabsorbent fibers based on vinyl hydrophilic polymers such as acrylic polymers; the other is single-component or multi-component hydrophilic fibers based on natural biomass. Water fibers, these two types of hydrogel fibers contain only one cross-linked network structure. [0003] The companies and their main products that have realized the industrial production of superabsorbent fibers at home and abroad mainly include: the British Technical Absorbents company adopts the technology of COURTAULD and the United Kingdom Colloid Company to produce the product name "Oasis" superabsorbent fiber; Alberta, Canada Camelot Super absorbents Co., Ltd. in Calcali City, the province adopts the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M10/00D01F8/18D01F8/10D01F6/44D01F1/10
Inventor 费宾卢新昆
Owner THE HONG KONG POLYTECHNIC UNIV
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