Modification of synthetic fibres
(57) Abstract:The invention relates to a method for the modification of synthetic fibers by activating the surface of the fibers with hydrogen peroxide in the presence of copper sulfate and subsequent grafting hydroxyethylacrylate from 2 to 9 % aqueous solution in the presence of fractional input of 0.8 - 1.0 aqueous solution of hydrogen peroxide when the module baths(1 : 5)- (1 : 25). The method allows modification of various synthetic (PKA, PAN, PET) fibers to impart hydrophilicity and reduced the electrified more economical (practically not formed homopolymer in the process of vaccination, and the degree of extraction of the monomer is close to 100%) without compromising achieved by known methods level properties of modified fibers. table 2. The invention relates to a method for the modification of synthetic fibers and can be ispolzovano to impart hydrophobic fibrous materials hydrophilicity and reduced electrified, which, in turn, contributes to superior textiles, and can also be used to make fibrous materials other consumer properties.A characteristic feature respictively chemical fibers. The efficiency of large-scale synthetic fibers in various industries inextricably linked with giving these fibers new properties (hydrophilicity, okrashivaemoy, conductivity, and others).One promising solution to this pressing problem is the chemical modification of the fiber by the method of graft polymerization using vinyl and other unsaturated monomers containing hydrophilic groups: carboxyl, amide and Quaternary salt.The choice of monomer determines the efficiency of making the fibers of a specified property, and the method of carrying out chemical modification determines the technical and economic aspects of the process of chemical modification, and the most economical is the process of the graft copolymerization in the finished fiber.Due to the inoculation of such monomers of the hydrophobic synthetic fibers are approaching hygienic properties of natural fibers. Reduced electrified and good adhesion of modified synthetic fibers provides the possibility of processing them into yarn for textile machinery for cotton spinning systems is how the strength, elongation, modulus, abrasion resistance and the effect of multiple deformations, which largely determine the performance properties of textile products in the modified fibers remain as high as and not modified.The analysis of publications on the problem of chemical modification of synthetic fibres showed that the highest number of publications devoted to the modification of polycaproamide (PKA) and fibers based on it [1, 2]
In accordance with well-known ways to obtaining graft copolymers is the use of oxidized (peroxidizing) polymer, activated before processing of the vinyl monomer ions of copper or of iron.Known methods of modification of synthetic fibers mainly differ in the conditions of the activation process, the surface of the fiber (the type and concentration of the peroxide and an activating agent) and vaccinations (type and concentration of the solution used for grafting monomer; temperature-time conditions module and baths). Depending on the chosen conditions of activation and chemical modification of fibers have different degree of grafting and are characterized by several excellent physico-mechanical and hygienist process, expenditure norms, the degree of extraction of the monomer, the content of homopolymer).A known method of improving hydrophilicity and reduce the electrified poly (ethylene terephthalate) (PET)  by activating the surface of the originating system: hydrogen peroxide salt of divalent copper, vaccinations 2-methylvinylpyridine when module 1 bath 50 and a temperature of 90oC with the subsequent translation of the grafted polymer in its Quaternary salt. The efficiency of the grafting monomer is 40 50 conversion of monomer 50 - 60
Closest to the proposed modification is a method of obtaining fiber MEGALON including activation peroksidaznoi (hydrogen peroxide or oxygen) surface PKA-fibre salt of divalent copper and subsequent inoculation acetylsalicylate 10 20 aqueous solutions at a temperature of 60 80oC for 30 to 100 minutes, the Obtained fiber MEGALONcontains up to 30 grafted polymer, characterized by increased absorption (W) to 7 wt. and low-electrified =3,3109ASM (unmodified PKA-fiber W has 4 wt. r=5,81012). However, in the process of obtaining fiber is formed a significant number of homopolymer to 25 mA is tion as PKA-fibers (PAN, PET fibers) is more economical, almost no reduction achieved by known methods level properties of modified fibers. During the process of grafting of the proposed method is almost not formed homopolymer, and the degree of extraction of monomer approaching 100
Modification of the fiber on the proposed method is carried out by activating the surface of the fiber with hydrogen peroxide in the presence of copper sulfate, followed by washing and vaccinations gidroxiatilkrahmala 2 6 aqueous solution in the presence of fractional input 0,8 1,0 aqueous solution of hydrogen peroxide when the module baths(1 5) (1 25).The difference of the proposed method modifications fiber is that vaccinated vinyl monomer is carried out from a solution of the monomer lower concentrations in the presence of advanced and fractional input of hydrogen peroxide at a lower module baths. This aggregation allows to increase the effectiveness of vaccination (to reduce the amount of homopolymer) and to increase the degree of extraction of the monomer.Example 1. 1 g staple PKA-fiber handle 1 in an aqueous solution of hydrogen peroxide in the presence of copper sulfate, administered at 0,06 aqueous solution at a ratio of solution is Then the fiber is washed 2 times with water at 60oC is placed in a temperature-controlled vessel with reflux condenser containing 10 aqueous solution of hydroxyethylmethacrylate and gradually add 1,0 aqueous solution of hydrogen peroxide at a ratio of volumes of solutions of monomer and hydrogen peroxide 4 1. The process of grafting is carried out at a temperature of 80oC for 120 minutes, a Modified fiber is washed several times with hot water at a temperature of 60 80oC and dried. The amount of grafted polymer is 12,2 by weight of the fiber, the content of homopolymer 8.2 wt. and the degree of extraction of monomer 0,953
Examples 2-10. The activation process and vaccinations PKA-fiber carried out analogously to example 1 according to the modes specified in table. 1.Examples 11-17. 1 g staple PKA-fiber treated twice every 24 minutes at a temperature of 60oC 1 aqueous solution of hydrogen peroxide at a temperature of 60oC in the presence of copper sulfate, administered at 0,06 aqueous solution at a ratio by volume of hydrogen peroxide solution 4 1. The process of grafting monomer is carried out analogously to examples 1-10 according to the mode specified in the table. 1. The amount of grafted polymer is 18,2 by weight of the fiber, the degree of extraction of monomer 0,999 of homopolymer when conducting Patna modify the way described in example 1, but the modes specified in table. 1.Example 28. Modification of POLYACRYLONITRILE fiber by way of a prototype.1 g of staple fibers-PAN activate 1 aqueous solution of hydrogen peroxide in the presence of copper sulfate, administered at 0,06 aqueous solution in the ratio of 4 to 1 with the recovered volume of aqueous hydrogen peroxide solution. Module activation process 1 30. Then the fiber is washed and placed in a temperature-controlled vessel with reflux condenser containing 10 aqueous solution of hydroxyethylmethacrylate. The process of grafting is carried out at a temperature of 80oC for 30 min and module 1 bath 30. The modified fiber is washed with water at 70 to 80oC and dried. The amount of grafted polymer is 10.8 content homopolymer 20 and the degree of extraction of monomer 0,681
Examples 29-35. 1 g staple PET fiber modified, as described in example 1, according to the modes given in table. 1. Modified fibers have a degree of grafting 4 15 contents of homopolymer 0.8 15,2 and the degree of extraction of monomer 0,7 0,9.Example 36. Modificate PET fiber according to the mode of the prototype.Carried out analogously to example 28, but instead of 1 g PAN-fibres take 1 Gia monomer 0,522, a homopolymer is formed in the amount of 22 by weight of the fiber.In table. 2 shows properties of the modified fibers (PKA, PAN, PET - fibers) of the proposed method and the method prototype.Analysis of these data shows that the proposed method is modification, and how the prototype provides the receiving fiber high hydrophilicity and low electrified. However, the proposed method, as can be seen from the table. 1, more cost-effective in terms of reducing the formation of homopolymer and increase the utilization of the monomer in the process of vaccination. Modification of synthetic fibers by activating the surface of the fiber peroxide compound in the presence of salts of bivalent copper, washing and inoculation minilateral monomer, characterized in that the vaccine conducted from 2 to 9% aqueous solution hydroxyethylmethacrylate in the presence of fractional input 0,8 1% aqueous solution of hydrogen peroxide when the module baths 1 5 1 25.
FIELD: textile industry.
SUBSTANCE: invention relates to textile finishing industry and can be used to improve resistance of wool textile materials against shrinkage and detrition. Method of invention consists in treating material with vinyl monomer solution in presence of initiator followed by rinsing and drying, said initiator being polyvinyl ether of α-hydroxyethyl-t-butylperoxide having general formula: wherein n=4-5, at monomer-to-initiator weight ratio (1-5):1 and temperature 95-100°C. Vinyl monomer is selected from group composed of acrylamide, methacrylamide, and methylolacrylamide.
EFFECT: improved complex of properties of modified wool textile materials due to increased resistance against shrinkage and detrition, and simplified modification method due to increased number of treatment steps.
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FIELD: textile industry, in particular, textile material finishing processes for imparting hydrophilic properties, reducing electrolyzing capacity and rendering high resistance to the action of various chemical substances to synthetic textile materials such as filaments, threads, cloths.
SUBSTANCE: method involves simultaneously activating and grafting on synthetic textile material during treatment of the latter at temperature of 95-100 C with aqueous solution containing 40-50 g/l of polyvinyl ester of α-oxyethyl-tertiary-butylperoxide of general formulation: where n=4-5.
EFFECT: improved complex of properties of modified synthetic textile materials and simplified modification process due to decreased number of treatment stages.
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SUBSTANCE: mixture for the given processing contains a 50% water solution of phosphorous-boron-containing methacrylate, neutralised by ammonia to pH 7 and a sodium persulphate initiator in quantity of 1-5% mass of phosphorous-boron-containing methacrylate with the following mass ratios of the components: phosphorous-boron-containing methacrylate - 50.0, water - 50.0, ammonia - 22.0, sodium persulphate - 1.0-5.0.
EFFECT: increased fire-resistance; strength and resistance to thermo-oxidative breakdown.
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SUBSTANCE: method involves grafting onto a synthetic fibre a phosphorous containing monomer at room temperature for a period of 15 minutes and subsequent drying. The phosphorous containing monomer used is a 50% water solution of phosphorous-boron-containing methacrylate, neutralised with a solution of ammonia to pH 7. Grafting is done in the presence of a sodium persulphate initiator, taken in quantity of 1-5% mass of phosphorous-boron-containing methacrylate.
EFFECT: simplification of the technological process of obtaining modified synthetic fibre; their increased fire resistance; strength and resistance to thermo-oxidative breakdown.
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