DE1620970A1 - Continuous process for the production of spinnable alkyl polymers with improved properties - Google Patents

Description

Inventor: Maria 10NESCU, Chem.

Vol. Rupublicii, 4-2 - Piatra Neamt,

Alexandra RIZESCU, Dipl.Ing. st. Domnita Florica, 1 Bucharest

Ana SZCZEPANSKI, Dipl.Ing. st. Bicaz, bloc 16 Piatra Neamt

Valeriu JUMANCA, Dipl.Ing. st. Chimiei, 85 A, Piatra Neamt

Ludmila SCUTELNICU, Dipl.Ing. st. Bicaz, bloc E 2, Piatra Neamt

"Continuous-Mches process for the extraction of spinnable • alkyl polymers with improved properties "

The present invention relates to a continuous Process for the production of ternary copolymer based on acrylonitrile, which is used for the production of fibers, threads, etc. improved properties allowed.

There are numerous processes for the production of spinnable, binary and ternary acrylic copolymers known as the main component Use acrylonitrile, while the other components use a monomer from the group of hydrocarbons, Alcohols, ethers, halides, amines, amides, unsaturated acids, Mono- and polybasic ketones, acrylates, etc. are.

ORIGINAL BATHROOM

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The main disadvantages of the binary copolymers are as follows;

- reduced dyeability,

- reduced shrinkage capacity, -.

The ternary copolymers also have the following disadvantages on:

- they need expensive raw materials,

- The fibers obtained have a low degree of whiteness, which means additional bleaching operations are necessary.

The present invention overcomes these disadvantages by the fact that acrylic fibers are obtained from ternary copolymers 85-90 <fo acrylonitrile, 6 - 9 $ vinyl acetate, 4 - contain 6 <fo Methylstiren, wherein the monomer mixture is fed continuously to form a homogeneous solution.

An exemplary embodiment of the invention follows below Procedure.

In a reactor, a solution is fed continuously from a mixture of 85 - 90 fa acrylonitrile, acetate 8-9 foYlnyl and 4 - 6 is fo Methylstiren. The reaction mass is constantly stirred and 1 $ _{KpS 2} Oo and NaoSpOc are introduced into it, while the pH value is kept below 7, preferably between 2 and 3-5; the polymerization temperature is between 50 and 70 ° C at atmospheric pressure.

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After the polymerization, a copolymer is obtained with a average molecular weights of 45,000 and 55,000 and one Degree of conversion between. 80 and 85? ». 14 weight parts of the obtained ternary polymer are mixed in.einem reactor with 75 "parts of ethylene carburate and 11 parts of water, after which is heated to 70 0 and deaeration by stirring and further heating to 80 to 90 ° C is carried out. Wake up filtering is extruded into a precipitation bath that contains the ethylene carburate in aqueous solution in concentrations between $ 16 and $ 25 . "■ ■" ■ '■ -

The resulting filaments are in a ratio of 1: 4 to Stretched 1: 5 with respect to the original length, followed by washing and drying, you can then turn into staple fibers or tear tape can be processed.

The acrylic fibers obtained have the following properties:

- Degree of saturation compared to 10Ö? Colored malachite green $ 2.75 »

- Tear strength 2-2.8 g / den

- relative resistance to
Looping 70-90 '$

- Shrinkability in water of 90 ° C 22 fo

The method according to the invention has the following advantages:

- The tendency to shrink due to thermal treatment is higher than other products

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- improved dyeability compared to basic dyes

- an increased frictional resistance

- a reduced cost price

- one obtains spinning solutions using organic or inorganic solvents.

Claims;

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Claims (1)

- / C - ■ Claim Continuous process for the production of ternary copolymers with improved properties, characterized in that for the purpose of increasing the affinity for dyes,
contains 6 $ Methylstiren is continuously polymerized - the shrinkability and the abrasion resistance a solution containing 8-5 - 90 fo acrylonitrile, vinyl acetate 6 -.9 fo and 4. FIG. 209813/1256