JPH03220394A - Chitin fiber paper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to paper made of chitin fibers,
More specifically, the present invention relates to chitin fiber paper suitable for medical use and quasi-drugs, which is characterized in that β-chitin is forcibly dispersed in water to form a l1m shape, and then paper is made.

[Conventional technology]

Chitin is a substance that is widely distributed in the natural world, and is contained in the shells of shrimp and crabs, the shells of mosquitoes, L-types such as I. ivy and captozoans, and fungi such as mushrooms and molds.

This is a polysaccharide with many β-(1,4)-linked N-acetyl-D-glucosamine residues, and its structure and properties are extremely similar to cellulose, but unlike cellulose, it is not found in the human body. It has the advantage of no rejection reaction and good biocompatibility.

Three conformational polymorphisms of chitin are known. α-chitin has polysaccharides oriented in opposite directions, β-chitin has polysaccharides oriented in the same direction, and γ-chitin has polysaccharides oriented in the same direction.

A-chitin, which is obtained from the shells of shrimp and crabs and is widely available on the market, cannot be made into paper because it precipitates while maintaining its shape even when it is forcibly stirred in water. It is known that α-chitin can be made into a solution using a special solvent, and that fibers and films can be formed from this solution.

However, these fibers and films are currently limited in their field of use due to economical reasons and technical problems, and are not used in a wide range of applications like ordinary paper.

[Problem that the invention seeks to solve]

The present invention aims to eliminate the above-mentioned conventional drawbacks and to provide chitin fiber paper whose manufacturing process is not complicated.

[Means for solving problems]

The chitin fiber paper of the present invention is produced by a papermaking method using chitin fibers in which β-chitin is forcibly dispersed in water.

The inventor of the present invention has conducted extensive research and found that simply by forcibly stirring β-chitin in water, the chitin crystals dissolve, chitin fibers become uniformly dispersed, and chitin fiber paper can then be obtained by papermaking. I found out.

We discovered that chitin fiber paper is a substance that does not exhibit an extinction reaction with the human body, so it can be safely used even in rough coatings that come into contact with the human body, and is particularly suitable for medical and quasi-drug purposes. It was completed based on this.

The β-chitin used in the present invention is obtained from the shells of cephalopods in the molluscs, the bristles of polychaetes and oligomorphs in the annelid phylum, the shells of anarticulates in the phylum brachiopoda, and the lumbar tubes of phylum Stenosa. In terms of quantity, it is preferable to obtain it from the carapace of the mollusc phylum Cephalopoda.

There are no particular limitations on the method for isolating β-chitin from the above substances, and any known method can be used as is. For example, there is a method in which lipids containing inorganic salts, proteins, and pigments whose main component is lucium carbonate, which is a coexisting substance of the above substances, are sequentially treated with dilute hydrochloric acid, hot dilute sodium hydroxide, and an organic solvent to remove them. . <)facI′1nnnJ, f(,:5tud
+es on Chitin 1. EnZyn+ic
DegradationOn or Chitin and
Chitin Esters, Au5tr, J, B
iol Sci, ,7. 8 (1954)) L
However, the Hachmar+ method or its variants have the drawback of simultaneously causing side reactions of depolymerization and deacetylation of chitin itself.

The β-chitin used in the present invention is not particularly limited, and purified β-chitin from which the above-mentioned coexisting substances have been completely removed is preferable. Moreover, high molecular weight β-chitin with few side reactions is more preferable. There is no particular restriction on the particle size of β-chitin, but it is preferable to grind it to 10 meshes or more in order to increase the dispersibility.

In addition to β-chitin, β-chitin derivatives such as alkyl chitin and acetyl chitin can also be used as raw materials for the present invention. An example of this alkyl chitin is 0
-Methyl-β-~chitin, 0-ethyl-β--chitin,
0--n-buupil-β-chitin, 0-isopropyl-
β-chitin, 0--n-butyl-8-chitin, O--
Isobutyl-β-chitin, 0-see-p,000-β-
Chitin, o-tert--butyl-8-chitin, 0-n
Examples of acetyl chitin include monoacetyl-β-chitin, diacetyl-β-chitin, o-isoamyl-β-chitin, and o-tert-amyl-β-chitin. -chitin, triacetyl-β-chitin, and the like.

These may be used alone or in combination of 2# or more.

If water is added to powdered or scaly β-chitin and forcefully stirred with a homomixer at 1100 rpm for 3 minutes, β-chitin fibers uniformly dispersed in water can be obtained. (In addition, the homo mixer used in this experiment was TK Homo Miki-HV-1 manufactured by Tokushu Kika Kogyo.) In the present invention, a binder such as polyvinyl alcohol, a natural viscous substance such as molasses or Polymer dispersants such as polyacrylamide, inorganic fillers, organic fillers, pigments, dyes,
N fuel, antifoaming agent, surface modifier, ultraviolet absorber, ultraviolet stabilizer, antioxidant, heat stabilizer and other additives may be used depending on the purpose and necessity.

The paper making method in the present invention is not particularly limited, and known methods can be used as they are. That is, the above β
- A paper stock in which 1 g of chitin fiber is dispersed is made into paper using a known paper making machine or by hand processing. At this time, paper may be made by mixing natural pulp, synthetic pulp, rayon fiber, and various other synthetic fibers, if necessary.

Next, the present invention will be explained in more detail with reference to Examples.

Example ! 1 (β obtained by the method of achIIIan) from the carapace of the cuttlefish
-1.0% per 100 parts by weight of chitin. After adding 000 parts by weight of water, the mixture was stirred for 3 minutes at 1,000 revolutions using a homomixer to obtain a paste-like material in which β-chitin fibers were uniformly dispersed. This was uniformly dispersed in excess water and paper was made to obtain chitin fiber paper.

Comparative Example 1 Commercially available α-chitin obtained from crab shell (Chitin CLH manufactured by Yaizu Suisan Kagaku Kogyo) in place of β-chitin in Example 1
When dry-pulverized to a size of 3 mm or less was used and forcefully stirred in the same manner, a fibrous dispersion was not obtained and the shape before stirring was maintained, making it unsuitable for paper making.

Example 2 β-chitin of Example 1! After mixing 100 parts by weight of 0.00 parts by weight and 100 parts by weight of kraft pulp, 2.000 parts by weight of water was added, and the mixture was stirred for 3 minutes at 1,000 rpm using a homomixer, resulting in uniform β-chitin fibers. A dispersed paste was obtained. This was uniformly dispersed in excess water and paper was made to obtain chitin-cellulose fiber paper.

Comparative example! Commercially available a-chitin obtained from crab shell (Chitin CLH manufactured by Yaizu Suisan Kagaku TJ) in place of β-chitin in Example 2
When dry-pulverized to a size of 3 mm or less was used and forcefully stirred in the same manner, (r-chitin maintained its shape before stirring and did not become a fibrous dispersion, and even when paper was made, it remained in the cellulose fibers.) Paper was obtained in which chitin particles were dispersed.

〔Effect of the invention〕

The chitin fiber paper thus produced by the method of the present invention is not a substance that the human body will reject, so it can be safely used in applications that come into contact with the human body, and is especially useful as a medical and quasi-drug product. be. (The applications of Ij and L are not limited to these. In addition, β-chitosan can be made into a dispersion liquid by forced dispersion as it is, and it can be manufactured using conventional papermaking methods, so there is no complicated process and it is very easy to use. It has excellent ffl productivity.

Claims (2)

[Claims] (1) Chitin fiber paper characterized in that chitin fibers are produced by a papermaking method. (2) The chitin fiber paper according to claim 1, wherein the chitin fibers are made by forcibly dispersing β-chitin in water.