SU574488A1 - Method of modification of polyvinylalcohol fibre - Google Patents

Description

in dioxane at a temperature of 20 ° C for 30 chemical. The wamna module is 40. Next, the fiber is subjected to a three-wiping, air drying, and heating for 25 min. At the end of the treatment, the fiber is washed with dioxane in Soxhlet apiarat.

The redox capacity of the ion is 1.8 mEq / g; cation-exchange capacity in static conditions is:

on caustic ice, mEq / g1.25

io AgNOs silver, mg / g 1.50

on mercury from Hg (NO3) 2, mg / g2,30

Sulfur content in fiber is 3.98%.

Example 2. The heat treatment of the freshly formed fiber is carried out as in Example 1. The fiber is treated with a 15% solution of p-fepyl-cc-mercaptopropionic acid of FORMULA

(Ovoh-oo

00 OH

N /

SH

in dioxane at room temperature for 30 minutes. Vaina module 40. After pressing for three times and drying in air, the fiber is heated at 140 ° C for 2.5 hours. Next, the fiber is washed from the excess acid with dioxa in the Soxhlet apparatus.

The redox capacity of the fiber reaches 2.6 mEq / g; cationioobmein capacity is; NaOi from NaOn, mEq / g 1.7 for silver ion from AgNOs, mg / g2.16

Mercury ion from Hg (NO3) 2, mg / g 2.71 Sulfur content in the fiber 5.61%.

Example 3. Preliminary thermal stabilization and treatment of polyvinyl alcohol fiber with P- (o-hydroxyphenyl) -cc-merkaitopropioic acid of the formula

O / CH-COOH

I SH OH

performed as described above.

The redox capacity of the fiber and the Fe. + Ion is 2.3 mEq / g; The cation exchange capacity is:

for ion of sodium from NaOH, mEq / g 4.6 for silver ion from AgNOs, mg / g 2.86 for mercury ion from Hg (NO3) 2, mg / g 3.00 Sulfur content in fiber 4.33% .

Example 4. Preliminary thermal stabilization and processing of polyvinyl alcohol fiber with thiosalicylic acid of the formula

Redex-capacity of the lead in the ion ReZ + is 3.2 mEq / g; Cation exchange capacity is:

io caustic soda, mEq / g

on silver out., mg / g

on mercury from Hg (N03) 2, mg / g Sulfur content in fiber 3.3%.

Example 5. Analogously to irimer, the processing of p- (7I-nitrophenylkaitopropionic acid fiber of the formula

CH-COOH

The redox capacity of the obtained fibers and the Res + ion is 1.08 mEq / g, the cation-exchange capacity under static conditions is:

io caustic iatru, mEq / g1,13

by silver ion from AgNOs, mg / g 2.16 by mercury ion from ng (NO3) 2, mg / g 2.10 Sulfur content in the fiber is 2.61%.

Example 6. Analogously to irimer 1, the treatment is carried out with p-(“-itrophenyl) -a-mercaptopropionic acid of formula

-CH-COOH I TH

The redox capacity of the ion is 0.96 mEq / g; cation-exchange capacity in static conditions is:

io caustic patra, mEq / g1.02

Silver ion from AgNOs, mg / g 1.84 for mercury ion from ng (NO3) 2, mg / g 2.10 Sulfur content in fiber 2.42%.

Thus, according to the invention, an i.volvinyl alcohol fiber is obtained having an electron exchange and enhanced cation exchange properties.

Claims (3)

Invention Formula A method for modifying polyvial alcohol fibers by treating them with an carboxylic acid followed by drying and heat treatment, characterized in that thiosalicylic acid or mercaptocarboxylic acid with the general formula SI-COOK SH 5 Sources of information taken into account during the examination 1. Ushakov S. N. Synthetic polyvinyl alcohol fibers. L., “TsBTI, 1959, p. 45.5 b 2. USSR author's certificate №317672, cl. C 08F 212/14, 1972. 3. Wolf L. A., Meos A. I. Fibers of special purpose. M., “Himi, 1971, p. 112