SU1647004A1 - Process for preparing cellulose phosphate - Google Patents

Abstract

The invention relates to a method for producing cellulose phosphate esters and can be used to produce ion exchange fibrous materials. The invention improves the strength of the target product from 3.0-6.9 to 11.8-13.0 cN / tex (the static exchange capacity is 3.8-5.5 mEq / g), which is achieved by impregnating the cotton fiber material with an aqueous solution of orthophosphoric acid and urea, followed by heat treatment, washing and drying the target product under tension. 1 tab

Description

This invention relates to the technology of cellulose phosphate esters and can be used to produce ion exchange fibrous materials.

The purpose of the invention is to increase the strength of the target product.

Example 1. An impregnating aqueous solution is prepared containing 43.4% orthophosphoric acid and 26.6% urea (molar ratio (LH2) 2: 1: 1) and heated to 70 ° C.

In the prepared solution, cotton threads are impregnated with a thickness of 19tex and 12.6 cN / tex strength for 2 minutes. After impregnation, the threads are out between rolls to a weight gain of 200%. Pressed yarns are placed in a heating chamber, where they are first dried for 0.5 h at 80 ° C, and then subjected to heat treatment for 0.5 h (etherified) at 175 ° C.

The resulting cellulose phosphate ester in the form of threads is washed in running water and dried for 0.5 h at 100 ° C.

Heat treatment, washing and drying of the filaments are carried out under a tension of 2.6 cN / tex. The finished product has a strength of 12.5 cN / tex and a static exchange capacity (SOY), 4.0 mg-eq / g.

Example 2-5. The procedure is carried out analogously to example 1. but with other yarn tensions. The data presented in the table.

Example 6. A tape with a width of 0.9 m of cotton gauze, the threads of which have a strength of 12.6 cN / tex, is pulled at a speed of 1 m / min sequentially through an impregnating aqueous solution containing 43.4% orthophosphonic acid and 26.6% carbamide and having a temperature of 70 ° C (duration of impregnation 1 min), heat chamber 10 m long. wash bath and drying chamber 2 m long. In a heat chamber and drying chamber, the tape is blown with air with a temperature of 175 and 100 ° C, respectively. Main threads

WITH

about

4 x

eight

are under tension 3 cN / tex. and weft - without tension.

In the final product, the main yarns have a strength of 12.8 cN / tex and EYE of 5.3 mg eq / g, and weft yarns have a strength of 6.9 cN / tex and EYE of 4.9 mg eq / g.

Example 7. Carried out analogously to example 6, but with tension of the main yarns 9 cN / tex.

In the finished product, the main yarns have a strength of 13.0 cN / tex and a EYE of 5.5 mg eq / t, and weft yarns have a strength of 6.9 cN / tex and a EYE of 4.9 mg eq / g.

Claims (1)

Invention Formula A method of producing cellulose phosphate ester in the form of a fibrous material by impregnating cotton cellulosic fibrous material with an aqueous solution of orthophosphoric acid and urea, followed by heat treatment, washing and drying, in order to increase the strength of the target product, heat treatment, washing and drying the material by living.