The method of obtaining fire protective chemical fibers
(57) Abstract:Usage: the technology for production of fire-protected fibers. The inventive chemical fibers treated in the aquatic environment of the redox system consisting of salts of ferrous iron and hydrogen peroxide, and grafted on fiber 2-(0-isobutylacetophenone)-methylpropenoate when the concentration in the reaction medium 5 - 7 wt.%. Oxygen index before/after 10 washings, %: viscose fiber 29,5 to 30.1/29,3 - 29,9, polyester fiber 30,3/30,0, polycaproamide fiber 28,7/28,4. table 1. The invention relates to a technology for fire protective chemical fibers, particularly synthetic (rayon) and synthetic (nylon, polyester). Fire protective chemical fiber intended for the manufacture of decorative fabrics used in institutions with mass stay of people (hospitals, hotels, railway transport, and so on), as well as for the manufacture of clothing for various purposes.A method of obtaining fire protective polyamide (PA) fibers by grafting to PA polyacrolein with subsequent processing dimethylphosphite or antimony chloride /1, 2/. Adnah">A method of obtaining fire-protected graft copolymers of cellulose with the use of phosphorus-containing monomers, for example-phenylphosphinic acid by pretreatment with aromatic amines in the molecule of the cellulose, followed by converting them into diazogroup with the aim of initiating graft polymerization /3/. The disadvantage of this method is a multistage process.Closest to the invention is a method for fire-protected fibers of regenerated cellulose by grafting after processing in the aquatic environment of the redox system Fe+2- H2O2poly-2-methyl-5-vinylpyridine) - derivatives (PMVP), followed by processing of a copolymer of cellulose with PMIT 1,0 2,0% aqueous solution of polyphosphoric acid at 20 60oC for 10 to 20 minutes, rinsing, wringing and drying /4, 5/.The main disadvantages of this method are
the two-phase process process
reducing fire retardant properties after repeated water treatments,
low efficiency of the flame retardant action of phosphoric acid salt PMIT for synthetic fibers.The technical object of the present invention is increased the s and the reduction process.This task is solved by a method of obtaining fire-protected fibers by processing in the aquatic environment of the redox system Fe+2H2O2and a grafting monomer, and according to the invention as a monomer using 2-(0-isobutylacetophenone)methylpropenoate with a concentration of 5 to 7 wt. in the reaction medium.2-(0-isobutylacetophenone)methylpropenoate (BMTN) are obtained in a known manner /6/. Vaccination is carried out by a known method using as the initiator of the well-known redox systems consisting of salts of ferrous iron and hydrogen peroxide, in known conditions /5/.At lower concentrations of phosphorus-containing monomer is less than 5 wt. modified fibers do not have flame-retardant properties (oxygen index KI < 27%). When the concentration of BMTN above 7 wt. dramatically increases the number of grafted homopolymer, reduced the number of grafted polymer and worse physical and mechanical properties of modified fibers.The method can be implemented at known operating equipment.The test results of the samples listed in the table.Pria (salt Mora) at a pH of 4.4 to 5.0 and 20oC for 20 min. Press. Then the fiber is placed in a 5% aqueous solution BMTN. In the reaction mixture is heated to 40oC, add 0.03 wt. H2O2and after heating up to 80oC conduct a vaccination for 90 min, after which the sample is washed with hot water (80 to 90oC) for 20 minutes, wring out and dry.Example 2. 100 g of viscose fibers pre-treated with 0.25% aqueous solution of salt Mora at pH 4.5 to 5.0, and 20oC for 20 min. Press. Then the fiber is placed in a 7% aqueous solution BMTN. In the reaction mixture is heated to 40oC, add 0.03 wt. H2O2and, after heating to 90oC conduct a vaccination for 90 min, after which the sample is washed with hot water (80 to 90oC) for 20 minutes, wring out and dry.Example 3. 100 g of polyester fiber polyester pre-treated with 0.25% aqueous solution of salt Mora for 20 min at a temperature of 20oC. Press. The sample was then placed in a 6% aqueous solution BMTN. The reaction mixture is heated to 40oC, add 0.03 wt. H2O2and, after heating to 90oC conduct a vaccination for 90 min, after which the fiber is washed with hot water (80 to 90oC) for 20 minutes, wring out Il salt Mora at pH 4.5 to 5.0, and 20oC for 20 min. Press. Then the fiber is placed in a 7% aqueous solution BMTN. In the reaction mixture is heated to 40oC, add 0.03 wt. H2O2and, after heating to 90oC conduct a vaccination for 90 min, after which the fiber is washed with hot water (80 to 90oC) for 20 minutes, wring out and dry.Example 5 (prototype). 100 g of viscose fibers pre-treated with an aqueous 0.25% salt solution Mora at pH 4.5 to 5.0, and 20oC for 20 min. Press. Then the fiber is placed in a 3% aqueous solution of acetic acid salt of 2-methyl-5-vinylpyridine) - derivatives. In the reaction mixture is heated to 40oC add to 0.025 wt. H2O2and, after heating to 80oC carry out the reaction for 120 min, after which the sample is washed with 0.5% solution of acetic acid, then with water and dried.The obtained graft copolymer of cellulose containing about 13% poly-2-methyl-5-vinylpyridine) - derivatives (PMVP), is treated at a temperature of 2 25oC a 2.0% aqueous solution of polyphosphoric acid for 45 min, washed with distilled water until neutral wash water and dried.Example 6 (prototype). 100 g of the fibers of the graft copolymer polyester with PMIT obtained as opisannyi PMIT 13 wt.), process at room temperature of 2.0% aqueous solution of polyphosphoric acid for 45 min, washed with distilled water until neutral wash water and dried.Example 7 (prototype). 100 g of the fibers of the graft copolymer of polycaproamide with PPSP, obtained as described in example 5, using the redox of Fe+2H2O2(contents PMIT 14%) treated at room temperature of 2.0% aqueous solution of polyphosphoric acid for 45 min and washed with distilled water until neutral wash water, and dried.As can be seen from table, the invention allows to significantly improve the stability of the flame retardant effect to wet treatments (decrease KEY after 10 washings, does not exceed 0.2 to 0.3 units) and flame retardant characteristics of chemical fibers. Using phosphorus-containing monomer BMTN were obtained fire protective PE and PA materials with KI, is 28.7 and 30.3%, respectively. At the same time using a known method on the prototype to get a fire-protected PA and PE fiber is not possible (CI 25,0 27,1%). The method of obtaining fire protective chemical fiber>and a grafting monomer, characterized in that, as a monomer using 2-(O-isobutyl, methylphosphonate)methylpropenoate with a concentration of 5 to 7 wt. in the reaction medium.
FIELD: textiles, paper.
SUBSTANCE: fabrics have an array of cooling elements connected to the base material for absorbing heat with simultaneous maintaining the desired properties of the base material. It is possible to use the cooling elements comprising a cooling gel, or polymer or phase-change material, at that under the action of moisture the cooling elements undergo chemical or physical change, due to which heat absorption is provided.
EFFECT: creation of fabrics that provide cooling of body.
20 cl, 18 dwg
FIELD: textile industry.
SUBSTANCE: invention relates to a method of producing cotton polymer coatings with hydrophobic properties, which can be used as protective, water-, dirt-proof coating. Method of producing polymer coating on surface of cotton fabric includes treatment of fabric by dipping in a solution of fluorine-containing compound, heating and subsequent drying, at that before processing the cotton fabric is sequentially treated in 3 % solution of poly-glycidylmethacrylate in methyl ethyl ketone and 0.1 M in solution of α-bromo-isobuthiryl-bromide in tetrahydrofuran, while processing is performed 1 M in solution of 2,2,2-trifluoro-ethyl methacrylate or 1,1,1,3,3,3-hexafluoro - isopropyl methacrylate in methyl ethyl ketone in argon medium at 80 °C in the presence of catalytic complex consisting of copper (I) bromide and bipyridine ligand.
EFFECT: high hydrophobic properties of cotton fabric.
1 cl, 1 tbl, 2 ex
FIELD: textile, paper.
SUBSTANCE: method comprises the fabric treating by the method of dipping in the solution of the applied compound and subsequent heat treatment at 140°C. Thus cotton fabric treatment is carried out for 30 minutes with a solution of a preformed lauryl methacrylate and glycidyl methacrylate copolymer in methyl ethyl ketone of 0.5-3 wt % at a molar ratio of glycidyl methacrylate monomer units:. lauryl methacrylate, equal to 9-7:1-3.
EFFECT: increased hydrophobicity of cotton fabric.
2 dwg, 3 tbl, 9 ex
SUBSTANCE: invention relates to a method for polymeric coatings obtaining on cotton cloth surface coatings to provide hydrophobic properties, which an be used as protective, water- and dirt-repellent coatings. The method comprises cloth treatment by immersion to the solution grafted onto the cloth surface, followed by heat treatment at 140°C. At that, the cotton cloth is kept in polyglycidylmethacrylate solution in methylethylketone. The resulting polymer coating is modified with a fatty acid, selected from stearic acid, lauric acid or palmitic acid, by keeping the cotton cloth in an acid solution with a concentration of 10-50 mmol l in isopropyl alcohol and subsequent heat treatment at 140°C for 20 minutes.
EFFECT: increased hydrophobicity of cotton cloth.
1 tbl, 9 ex
FIELD: textile, paper.
SUBSTANCE: method of compacting a fibrous material includes adding to a fibrous material a binder selected from the group consisting of water-soluble binders, water-swelling binders, and binders with a glass transition temperature of less than 25°C. A combination of a fibrous material and a binder is obtained. A combination of a fibrous material and a binder is made to produce a densified fibrous material having a bulk density that is at least about twice the bulk density of the fibrous material. Fibrous material prior to compaction has a bulk density of less than 0.15 g/cm3, which is determined according to the ASTM D1895B method. This fibrous material is obtained by cutting fibrous raw materials from cellulose or lignocellulosic materials, including herbs, rice husks, bagasse, cotton, jute, hemp, flax, bamboo, sisal, straw, sawdust, paper, manila hemp, wood, coconut fiber, corn cobs.
EFFECT: invention makes it possible to obtain a densified fibrous material of the required density.
14 cl, 33 dwg
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.
1 tbl, 18 ex
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.
1 tbl, 6 ex
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.
2 tbl, 3 ex
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.
1 tbl, 6 ex