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Enhanced hydroxypropyl cellulose microporous film and preparation method thereof

A technology of hydroxypropyl cellulose and microporous membranes, which is applied in the field of microporous membranes, can solve problems such as easy shrinkage, rupture, mechanical properties and dimensional instability of microporous membranes, and improve mechanical properties and dimensional stability, improve Effects of toughness, tensile strength, and film structure stability

Inactive Publication Date: 2014-07-02
SUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydroxypropyl cellulose can be used in the production of fibers and films, but untreated hydroxypropyl cellulose membranes are prone to shrinkage and rupture during drying, and the mechanical properties and dimensions of microporous membranes are unstable.

Method used

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  • Enhanced hydroxypropyl cellulose microporous film and preparation method thereof
  • Enhanced hydroxypropyl cellulose microporous film and preparation method thereof
  • Enhanced hydroxypropyl cellulose microporous film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The above-mentioned treatment of the reinforced hydroxypropyl cellulose microporous membrane is the same as that of the comparative example. After drying at room temperature, put the membrane into the refrigerator and freeze it at -20°C for 24 hours, then take it out and dry it in the air. The microporous membrane has a micropore diameter of about 150nm and a tensile strength of 24MPa. For cross-sectional photos see attached image 3 shown.

Embodiment 2

[0034] The above-mentioned treatment of the reinforced hydroxypropyl cellulose microporous membrane is the same as that of the comparative example, after being cross-linked and plasticized, steamed at normal pressure for 2 hours, and then dried at room temperature. The microporous membrane has a micropore diameter of about 50nm and a tensile strength of 20MPa. For cross-sectional photos see attached figure 2 shown.

Embodiment 3

[0036] The above-mentioned treatment of the reinforced hydroxypropyl cellulose microporous membrane is the same as that of the comparative example. After the cross-linking and plasticizing treatment, it is steamed at normal pressure for 2 hours, dried at room temperature for 2 hours, and the membrane is placed in the refrigerator and frozen at -20°C for 24 hours. , remove to dry. The microporous membrane has a micropore diameter of about 80nm and a tensile strength of 20MPa. For cross-sectional photos see attached Figure 4 shown.

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Abstract

The invention discloses an enhanced hydroxypropyl cellulose microporous film and a preparation method thereof. The preparation method comprises the following steps: dissolving hydroxypropyl cellulose into an alkaline water-soluble solvent system subjected to precooling treatment to obtain a hydroxypropyl cellulose solution; causing the obtain solution to form a film through tape casting, and solidifying in an acid coagulation bath; carrying out cross-linking and plasticizing processing after water washing, and continuing to water vapor boiling under atmospheric pressure or freezing or water vapor boiling under the atmospheric pressure and then freezing; and drying in the air to obtain the enhanced hydroxypropyl cellulose microporous film. The hydroxypropyl content of the hydroxypropyl cellulose is 2-20 percent by weight. The toughness, the tensile strength and the air and water permeability of the film are improved, and the biodegradable homogeneous microporous film is obtained. The microporous film can be widely applied to the film separation process and can be used as packaging films, film electrodes or biomedical materials.

Description

technical field [0001] The invention relates to a microporous membrane whose main material is cellulose, in particular to a reinforced hydroxypropyl cellulose microporous membrane and a preparation method thereof. Background technique [0002] Microporous membranes are used as packaging, biomedical, water purifiers, various separation membranes, breathable housings, batteries, and electrolytic capacitor diaphragm materials. [0003] The plastic film made of petroleum and natural gas resources not only has a long process, is highly polluting, and cannot be biodegraded. The development of microporous membrane materials has become an inevitable trend. [0004] Cellulose is a renewable natural polymer material with abundant sources. It has the advantages of low price and biodegradability. It is widely used in textile, papermaking and other fields. However, cellulose has the disadvantages of difficult thermoplastic processing and poor solubility. At present, the cellulose solv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/12C08J7/00C08J9/00C08L1/26C08L71/08C08K5/053
Inventor 朱新生张伟刘颖李青松周正华刘兆峰俞波
Owner SUZHOU UNIV