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Preparation method of double-net hydrogel fiber and product thereof

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: 2015-05-27
THE HONG KONG POLYTECHNIC UNIV
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  • Abstract
  • 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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  • Preparation method of double-net hydrogel fiber and product thereof

Examples

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preparation example Construction

[0028] A method for preparing dual-network hydrogel fibers includes the following steps:

[0029] (1) Preparation of spinning dope:

[0030] Dissolve one or more water-soluble natural polysaccharides and water-soluble acrylamide polymers in water, stir them evenly, and then filter and defoam to obtain natural polysaccharides with a certain viscosity and containing 1-8% (mass percentage). The mixed spinning dope of polysaccharide and 4-30% (mass percentage) of acrylamide polymer, wherein the mass ratio of natural polysaccharide to propionamide polymer is 1:1-1:10;

[0031] Wherein, the natural polysaccharide is alginate, carrageenan (kappa type carrageenan, Iota carrageenan), agar, or konjac flour, etc. 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 includes: acrylamide an...

Embodiment example 1

[0043] Weigh a certain amount of sodium alginate and polyacrylamide (molecular weight 2,000,000-2,500,000), quickly stir and dissolve in water at room temperature, filter, and defoam under reduced pressure to obtain a spinner containing 2% sodium alginate and 12% polyacrylamide. Silk dope, in which the mass ratio of sodium alginate to polyacrylamide is 1:6. Through dry-wet spinning, the spinning dope is spun into an 80%wt ethanol aqueous solution containing 5%wt calcium sulfate at a speed of 30m / min to coagulate into nascent fibers, where the air layer distance is 2cm, and the barrel temperature is maintained At about 70°C, the coagulation bath temperature is about 25°C, and the ratio of drawing speed to spinning speed is 1.5:1. Then, the nascent fiber bundle is drawn into the cobalt source ( 60 Co) Irradiation device, continuous irradiation cross-linking, the total irradiation dose is 50kGy. After subsequent drawing, heat setting and winding processes, a high tenacity double ...

Embodiment example 2

[0045] Weigh a certain amount of Iota-type carrageenan and polyacrylamide (molecular weight 5,000,000-6,000,000), quickly stir and dissolve them in 70℃ water, 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. Through gel spinning, the spinning stock solution is spun into a 50%wt ethanol aqueous solution at a speed of 30m / min to coagulate into nascent fibers. Among them, the barrel temperature is maintained at about 70°C, the coagulation bath temperature is about 0°C, and the ratio of the pulling speed to the spinning speed is 1.5:1. Then, the nascent fiber bundle is drawn into the electron beam irradiation device for continuous irradiation cross-linking, and the total irradiation dose is 10 kGy. Finally, a high tenacity double network hydrogel fiber was prepared through subsequent drawing, heat setting, and winding processes, and it...

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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, to a method for preparing double-network hydrogel fibers and products thereof. Background technique [0002] At present, there are two main types of hydrogel fibers. One type is superabsorbent fibers with vinyl hydrophilic polymers such as acrylic polymers as the main body; the other is single-component or multi-component hydrophilic fibers with natural biomass as the main body. Water fibers, both types of hydrogel fibers only contain a cross-linked network structure. [0003] The companies and their main products that have realized the industrialized production of superabsorbent fibers at home and abroad mainly include: British Technical Absorbents company adopts the British COURTAULD and British United Colloids technology to produce the brand name "Oasis" superabsorbent fiber; Canada Alberta Camelot Super Absorbents Co., Ltd., Galcali City, Province, adopts the techno...

Claims

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Application Information

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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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