SU696068A1 - Fibre-forming composition - Google Patents

Description

Irbreating refers to the field of synthetic fibers, in particular the preparation of compositions of polyvinyl chloride, a copolymer of vinyl chloride BVC (polyacrylonitrile and polyacrylonitrile (CHAN)), and can be used for the manufacture of technical fabrics, felts, and filter materials. A spinning solution is known for producing fibers and films, consisting of PVC and 1-2% (by weight of PVC) of organotin compounds based on dibutyl alcohol and derivatives of unsaturated acids l. This class of compounds is an effective stabilizer for both PVC solutions and fibers based on it. However, organotin stabilizers have such a significant disadvantage as their loss is significant (from 15 to 60%) as a result of dissolution in a precipitation bath during fiber formation. It is known that oligomeric organosilicon compounds obtained by polymerization. methacryloxymethylpentamethyldisiloxane or bis- (acridoximetsh1) tetra-. ramethyldisiloxane can be used as PVC 2 photo stabilizers. A known composition for the formation of PVC fibers, in which polyphenylsilvioxanes of the formula (CgHsSi where n is not less than 8) are introduced as stabilizing additives to achieve a high stabilizing effect while obtaining non-reduced HbDc PVC fibers. 3 However, polyphenylsilsesquioxanes cannot improve the heat resistance of PVC in dimethylformamide solutions of PVC in dimethylformamide solutions. In addition, polyphenylsilvioxanes are cevoloids. therefore, the introduction of them into PVC leads to a decrease in the physical and mechanical properties of the formed fibers. Polyphenylsiloxane are "united with the spatial structure, therefore, the flexibility of the silage chain is lost in them. Therefore, they are also attached to the PVCs. resistance to double bending of the formed fibers .-, the known composition for forming fibers consisting of cellulose ester and organosilicon additives, in the quality of which polyacrylate siloxane (PAS) block copolymer is used with the number of arylate units X - 10-20 and Syloxane units V 20-100 of the following formula i CO - Ar-CO-AG-q-M- $ 1 the ratio of components wt.%:

h CO - Ar

-SOO-Ag-S-Ag: U

with where At X is arylene; 26-40; 150-300, at the following ratio of components wt.%: Polymer 15-23 Polyarylatesiloxane block copolymer 0.75-2.3 Solvent Remaining Example 1. A fiber is used for forming fibers. a solution of a mixture of PVC and polyarylate siloxane block copolymer in the ratio of arylate and siloxane units in blocks 26/180 And characteristic viscosity in chloroform at 1 O, 7 dl / g, taken in O amount, 1%. The temperature of the solution-lOOi 2 C preparation. The solution solution can be obtained either by combining a mechanical mixture of polymers in a certain volume of solvent, or by mixing PVC and PAS solutions of the block copolymer. The molding is carried out according to the following mode: The temperature of the solution, 70 ± 1 ° C per step, on the molding.

,), - $ L-0 Zfir cellulose 14-19 Polyarylatesiloxane block copolymer 0.7-5.7 Solvent methylene chloride): 92: 8 vol%) - Remaining 4. However, use 1. to modify the PAS cellulose esters The copolymer of this composition does not allow imparting enhanced heat resistance to spinning solutions of PVC in dimethylformamide and significantly increasing the heat resistance of the formed fibers and resistance to double bends. The purpose of the invention is to increase the heat resistance and resistance to double bending of fibers based on PVC and PAN molded from di-methylformamide solutions. The goal is achieved in that the composition contains polyvinyl chloride, polyacrylonitrile or their copolymer as a polymer, and a compound of the formula as a block copolymer Composition of precipitating 15:85 bath water: DMF Te Sepatypa precipitator 20 ± 2 nd bath 2 Filtration,% Plasticizing zhka in steam,% Physico-mechanical characteristics of the fiber are shown in the table. Example 2. To form a fiber, use a 22% solution of a mixture of PVC and PAS-block copolymer. a ratio of arylate and siloxane units X / 40/150 and an intrinsic viscosity of 0.6 dl / g, taken in an amount of 1.5%. The molding conditions are the same as in Example 1. The properties of the solution and fiber are shown in the table. Example 3. A 23% solution of a mixture of PVC and PAS-block copolymer with a ratio of X./v 30 / / 200 ariate and siloxane units and a characteristic viscosity of 0.86 dl / g, taken in an amount of 2, is used for molding. 3 The shaping conditions are similar to those described in Example 1. Example 4. The molding is carried out from a 22% dimethylformamide solution of a mixture of vinyl chloride copolymer with acrylonitrile (60% vinyl chloride) and PLS block copolymer, taken in the amount of 1.1%, Ratio of arylate and the strength of the X / V unit links is 26/300 and the intrinsic viscosity is 0.94 dl / g. The state of the precipitating bath: water-dimethylformamide at a volume ratio of 30-70. The remaining conditions for forming fibers are similar to those specified in Example 1. Example 5 Dimethylformamide solution of vinyl chloride-acrylonitrile copolymer salt and PAS block copolymer, taken in an amount of 3%, is used for forming fibers. Ratio of arylate and siloxane units X / V 40 / 150, Composition of the precipitation bath: water-dimethylformamide at a volume ratio of 30:70. The remaining conditions of forming the fibers are similar to those specified in Example 1, Example 6. To form a fiber, use a 15% dimethylformamide solution of PAN containing 0.75% PAS-block copolymer with a ratio of X / V 40/150 aryl and siloxane units. The molding is carried out in the following mode; The temperature of the solution coming to the form of 20 ± 1 ° C The viscosity of the old solution at the Fieler 10O resp. diameter 0, O5 mm Composition of precipitating 3 O-7 O i over the water bath: DMF volume) Temperature of the precipitation bath 2O 11 C Filler extract,% 5 Plasticification of the extract in glycerin,% 700 Physical and mechanical properties of the formed fibers are shown in the table, Example 7. To form a fiber, use 17% dimethylformamide solution of PAN containing 1.7% i PASS block copolymer with a ratio of arylate and siloxane units of K / Y 26/300. Fiber shaping is carried out in the same way as in Example 6. Thus, polyarylate-siloxane block copolymers are used as an additive in the PVC composite of a vinyl chloride copolymer with acrylnitrile and PAN) provides the following advantages: Modified composites do not require the use of additional thermal stabilizers. in dimethylformamide solutions, have stability, viscosity properties during their prolonged heating, the fibers obtained by molding the modified spinning solutions, possess the increased heat resistance and resistance to double bends.

and

IS

“W / t, -, ir The formula for forming fibers was invented, consisting of: A polymer from a polymer, a polyarylate polysiloxane block copolymer, and a solvent; SB Ag-SOO-AR-s -Ai

Ar X

- Allen;

Where

-26-40;

-150-ZOO,

in the following ratio, wt.%:

Polymer15-23

Block copolymer 0.75-2.3

SolventExtra

Information sources, taken into account in the examination of the web. o

1.Pakshver A, B. Fibers from synthetic polymers, M., Himi, 1970,

with. 209.

2. US patent number 2956044, cl. 260-46.5, publ. 1960

3. USSR author's certificate number 272475. cl. TfOl F 6/02, 1970.

4. USSR author's certificate number 519507, cl. B01 F 1/02, 1976

(prototype). To this end, in order to increase the thermal stability and flexibility of the diode bends c4) of the fibers, ivolyvinyl chloride, polyacrylonitrile or their copolymer are used as the polymer, and the compound of formula (OH,), Si-0} as the block copolymer