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Poly 4-methyl-1-pentene hollow fiber membrane and preparation method thereof

A fiber membrane and methyl technology, which is applied in the field of poly-4-methyl-1-pentene hollow fiber membrane and its preparation, can solve the problem of uneven distribution of membrane pore size, difficulty in controlling the stretching distance of lamellae, and membrane separation performance. Low problems, to achieve the effect of easy industrial implementation, easy continuous preparation process, and simple operation

Pending Publication Date: 2021-02-09
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the poly-4-methyl-1-pentene hollow fiber gas separation membrane prepared in the prior art still has an inhomogeneous pore size distribution, which in turn causes the shortcoming of low membrane separation performance. As patent CN101623600A discloses a poly-4-methyl-1-pentene 1 Pentene hollow fiber gas separation membrane, the fiber with lamella structure will be pulled apart to form micropores in the stretched state, but it is difficult to control the stretching distance of the lamella during the stretching process, so that the membrane The pore size distribution is uneven, which affects the separation performance of the membrane

Method used

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  • Poly 4-methyl-1-pentene hollow fiber membrane and preparation method thereof

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preparation example Construction

[0023] The invention provides a kind of preparation method of poly-4-methyl-1-pentene hollow fiber membrane, comprises the following steps:

[0024] (1) Mixing 4-methyl-1-pentene resin, diluent, water-soluble additives and water-insoluble additives to obtain a spinning solution; the mixing temperature is 130-180°C;

[0025] (2) co-extruding the spinning solution and the core liquid obtained by the step (1), entering the coagulation bath through the air layer, obtaining the nascent poly 4-methyl-1-pentene hollow fiber membrane; the coagulation bath The temperature is 30-50°C;

[0026] (3) soaking the nascent poly-4-methyl-1-pentene hollow fiber membrane obtained in the step (2) with a soaking solution to obtain a poly-4-methyl-1-pentene hollow fiber membrane.

[0027] The invention mixes 4-methyl-1-pentene resin, diluent, water-soluble additive and non-water-soluble additive to obtain spinning solution.

[0028] In the present invention, the mass content of 4-methyl-1-pentene...

Embodiment 1

[0052] (1) Preparation of spinning solution: Mix 4-methyl-1-pentene resin, diethyl phthalate, calcium chloride and silicon dioxide at 150°C, and then deaerate at a constant temperature of 120°C 5h, obtain spinning solution; Wherein, the mass content of 4-methyl-1-pentene resin in the spinning solution is 45%; The mass content of diethyl phthalate is 43%; The mass content of calcium chloride 7%, the mass content of silicon dioxide is 5%;

[0053] (2) Preparation of nascent hollow fiber membrane: inject the above-mentioned spinning solution into the annular hole of the inserted tubular spinneret through a metering pump, and use water as the core liquid, inject it into the inner hole of the inserted tubular spinneret through the metering pump , using screw extrusion to extrude the spinning liquid and the core liquid at the same time, and then enter the aqueous solution at 30°C through a 4cm air layer to cool and form to obtain a nascent hollow fiber membrane; wherein, the outer d...

Embodiment 2

[0059] (1) Preparation of spinning solution: Mix 4-methyl-1-pentene resin, dioctyl phthalate, polyethylene glycol-400 and silicon dioxide at 160°C, then mix at 125°C Constant temperature defoaming for 6 hours to obtain a spinning solution; wherein, the mass content of 4-methyl-1-pentene resin in the spinning solution is 50%; the mass content of dioctyl phthalate is 40%; polyethylene glycol The mass content of alcohol-400 is 6%, and the mass content of silicon dioxide is 4%;

[0060] (2) Preparation of nascent hollow fiber membrane: inject the above-mentioned spinning solution into the annular hole of the inserted tubular spinneret through a metering pump, and use water as the core liquid, inject it into the inner hole of the inserted tubular spinneret through the metering pump , the spinning solution and the core solution are extruded at the same time by means of screw extrusion, and then cooled and formed in an aqueous solution at 40°C through a 6cm air layer to obtain a nasc...

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Abstract

The invention provides a preparation method of a poly 4-methyl-1-pentene hollow fiber membrane. The preparation method comprises the following steps: by using a thermally induced phase separation method, controlling the mixing temperature of 4-methyl-1-pentene resin and a diluent to obtain a homogeneous solution, co-extruding the homogeneous solution serving as a spinning solution and a core solution, and carrying out solid-liquid phase separation in a coagulating bath through an air layer. The pore diameter and porosity of the hollow fiber membrane can be controlled by controlling the temperature of the coagulating bath, and finally, the diluent is removed by soaking so that the poly 4-methyl-1-pentene hollow fiber membrane with uniform pore diameter distribution is obtained. The result of the embodiment shows that the porosity of the support layer in the poly 4-methyl-1-pentene hollow fiber membrane provided by the invention is 37%, the pore size distribution is 20-200nm, the O2 transmission coefficient of the hollow fiber membrane is 142 Barrer, the N2 transmission coefficient is 156 Barrer, and the CO2 transmission coefficient is 138 Barrer.

Description

technical field [0001] The invention relates to the technical field of fiber membrane materials, in particular to a poly-4-methyl-1-pentene hollow fiber membrane and a preparation method thereof. Background technique [0002] Due to the advantages of high separation effect, low energy consumption, and easy operation, gas membrane separation has shown unique advantages in the competition with traditional separation technologies such as adsorption, absorption, and cryogenic separation. At present, according to the structural form of the separation membrane, it can be divided into four structures: hollow fiber type, hollow tube type, flat plate type, and roll type. Among them, the hollow fiber type has a self-supporting structure, the module preparation process is simple, and the amplification effect is small. Larger membrane area can be provided in the volume, the bulk density is higher than that of tubular membranes, and the pretreatment and maintenance are simpler than other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D69/08B01D67/00B01D53/22
CPCB01D53/228B01D67/0016B01D69/08B01D71/26
Inventor 刘海辉赵小芳杨慕容王学晨
Owner TIANJIN POLYTECHNIC UNIV
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