SU364624A1 - METHOD OF OBTAINING MODIFIED PULMONUS MATERIALS - Google Patents

Description

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This invention relates to methods for the chemical modification of cellulosic materials.

A method of modifying cellulosic materials by treating them with c-oxides of olefins with nitrogen-containing substituents is known, which, for example, improves the durability of such materials.

In order to obtain bactericidal and inminable cellulosic materials according to the proposed method, the starting material is sequentially treated with c-oxide with a nitrogen-containing heterocyclic substituent of the general formula

OK., - N

ft-i OB

about

ABOUT

-sn.

Szhg

-le

CJUfc - - en

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and then with iodine solution.

The processing of cellulosic material with these α-oxides is preferably carried out in an alkaline medium at 40 ° C for 10-50 hours.

Cellulose as well as its various derivatives containing unsubstituted hydroxyl groups can be used as a starting material. Pre-mercerization is carried out with 5-10% -py.m solution

alkali. With an increase in alkali concentration and an increase in the duration of the reaction, the number of substituted hydroxyl groups increases to 85%. In the IR spectra of modified materials, an absorption band appears at

1100, characteristic of the ester bond,

and there is no epoxy absorption band at 850.

Example 1. Cotton pulp or

viscose fiber is treated for 30 minutes. 5-10% solution of alkali. After squeezing, the cellulosic material is placed in an acetone solution of H- (2,3-epoxypropyl) -pyrrolidone (bath module 1: 20, the ratio of cellulose and reagent is 1: 5) and thermostatted at 40 ° C for 10-50 hours. The sample is washed with a soap-soda solution, then with acetone and a substance. The nitrogen content in the cellulose sample is 2.65%, in the viscose sample it is 3.6% (for complete substitution, calculate 1

nitrogen content of 4.6%). The resulting material is treated with an aqueous solution of iodine, washed with alcohol and water. The maximum content of iodine is 8.5%.

Example 2. Cotton pulp or rayon fiber is treated under the conditions of Example I of N- (2,3-epoxy-nronl) -cc succinimide. The nitrogen content in the cellulose sample is 2.46%, in the viscose sample it is 3.47% (the nitrogen content is 4.3% for total replacement).

Example 3. Cotton cellulose or viscose fiber is treated under the conditions of Example 1 M- (2,3-enoxiprocyl) -a-phthalimzd. The nitrogen content in the cellulose sample is 2.32%, in the viscose sample it is 2.52% (the nitrogen content is 3.8% for a full substitution).

The materials obtained by the proposed method suppress the growth of microorganisms (dysenteric bacilli, Staphylococcus aureus, etc.); In addition, the treatment with a-windows makes the fabrics made of cellulose materials crushable.

The subject is invented and

1. A method for producing modified cellulosic materials by treating

cellulosic material with a / .- oxide with a nitrogen-containing substituent, characterized in that, in order to produce bactericidal and inminable cellulosic materials, the convertible material is subsequently treated with oi-oxide with a nitrogen-containing heterocyclic substituent of the general formula

N.S - ON - Syag- R

CEE - SNG

(1- SNg

-.

SNG

G I)

- SNG

)

II o

25 and then with iodine solution.

2. A method according to claim 1, characterized in that the treatment with ss-oxide is carried out in an alkaline medium at a temperature of 40 ° C for 10-50 hours.