Polymer composition to obtain films and fibers

 

(57) Abstract:

Use: production of molded products having high strength and heat resistance. The inventive composition to obtain films and fibers contains 2.5 to 9.5 wt.% polyvinyl chloride, 0.5 to 2.5 wt.% copolymer of poly-p-financereal-amide, comprising 20-90 mol.% metaphenylenediamine, 4,4'-diaminodiphenylamine, 2,7 diaminodiphenylsulfone or 4,4'-diaminodiphenylsulfone, 2.0 to 4.0 wt. % lithium chloride or calcium and organic solvent to 100 wt.%. table 4.

The invention relates to the production of films and fibers of compositions containing polyvinyl chloride (PVC) and aromatic polyamide (PA).

Known [1,2] PVC composition with PA various structures, preferably poly-p-phenyleneterephthalamide (PPTA) or poly-p-benzamide (PBA) containing polyamide in the amount of 0.2-20% and allowing a few to improve the physico-mechanical properties of films based on PVC. The main disadvantage of these compositions is the complexity of their preparation, due to the significant difference in the properties of PVC and PA needed for alignment: the lack of a common solvent; a large difference in the melting points or softening.

Closest to the claimed composition is described in [1] the Lack of composition [1] in addition to the above, as well as the impossibility of processing directly from solution is the low level properties from the films compared with the properties of the plastic film (PL. 1).

The technical result of the invention to provide films with high strength and heat resistance, as well as visokoelasticnih fibers of the compositions PVC PA.

This is achieved by the fact that in the composition along with PVC and PA is introduced amide solvent dimethylacetamide (DMAA) or N-organic (MP) and salt lithium chloride or calcium, and as polyamide used soluble copolymers of PFTA containing from 20 to 90 mol. one of the following diamines: m-phenylenediamine, 4,4'-diaminodiphenylamine, 2,. what about the (50:50) wt. The resulting solution compositions are stable over time and due to the good combination of copolyamids with PVC when vicadine in water to form a transparent film with high physical-mechanical indicators or shiny fibers with high heat resistance.

The relationship between PA and PVC composition selected from the following considerations: with the introduction of PVC 5 wt. one of the selected copolyamids heat resistance of the films and fibers, as measured by the dependence of deformation temperature at a constant load, increases dramatically (under a load of 10 kg/cm2deformation is not observed up to 400oC); introduction to PVC by weight more than 50. expensive PA impractical economically.

For the preparation of compositions used solutions copolyamids obtained by interaction of dichlorohydrin terephthalic acid with a mixture of p-phenylenediamine (p-PDA) with one of the above diamines in DMAA or MP, containing 1-5% lithium chloride or calcium. The composition used copolyamids are given in table.2. Received the PA solution was added to 10-15% of the resultant solution of PVC in the same solvent and thoroughly mixed.

Total concentration of polymers in solution is 5-12 wt. salt 2-4 mA is on lithium (calcium), mix for 1 h at room temperature with a solution of polyvinyl chloride in the solvent used dimethylacetamide (DMAA) or N-mailprovider (MP). The resulting solution composition after deaeration is applied to the glass layer of 0.2-0.3 mm and placed in water at 25oC to 60 C. was Separated from the glass film is washed with water and dried at 100oC.

Fiber from a solution of the composition produced by the method of wet formation through the die plate 100 holes with a diameter of 0.08 mm in 50% aqueous solution of dimethylacetamide. The path length of the thread in a precipitation bath 25-50 cm, speed molding 2-5 m/min. Formed filaments were washed with water, dried at room temperature and was given to 100 kr/m

Examples 8-9 (control). Prepare the control film of pure polyvinyl chloride (example 8K) and from the composition with a lower content of PA (example 9K).

Examples 10-12 (control). Preparing a film of polyvinyl chloride compositions with known polyamides differing in composition from the offer. The compositions are given in table. 3, the composition of the polyamides in the table. 2, the properties of the films and fibers in the table. 4. For comparison in the table. 4 shows properties of the films obtained in a known manner of the prototype. < the polyamide and an organic solvent, characterized in that it contains polyamide copolymer of poly-p-phenyleneterephthalamide comprising 20 to 90 mol. one of the following diamines: m-phenylenediamine, 4,4'-diaminodiphenylamine, 2,7-diaminodiphenylsulfone, 4,4'-diaminodiphenylsulfone, as the organic solvent dimethylacetamide or N-organic, and also the lithium chloride or calcium in the following ratio, wt.

Polyvinyl chloride 2,5 9,5

Aromatic polyamide 0,5 2,5

The lithium chloride or calcium 2,0 4,0

Organic solvent Ostalnoe

 

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