The method of obtaining the thermo - and light-stabilized polycaproamide

 

(57) Abstract:

Thermo - and light-resistant polycaproamide is produced by polymerization of caprolactam in the presence of 1,2,3-benzotriazole copper formula I in amounts of from 0.005 to 0.1% by weight of the monomer and inhibitor deposition of copper - gl26N2On or AS36N2About the number of a 0.012 to 0.1% by weight of monomer. The invention improves the heat and light resistance of the filaments of stable polycaproamide. table 2.

The invention relates to the manufacture of polycaproamide fibres and can be used for stabilizing cord, chords and technical yarns.

A method of obtaining thermo - and light-stabilized polycaproamide by the polymerization of caprolactam in the presence of the stabilizer - copper complex of ortho-phthalic acid with Ethylenediamine (ISS-21), taken in an amount of 0.005 - 0.5% by weight of the monomer and inhibitor deposition of copper iodide of potassium or magnesium chloride, taken in an amount of 0.05 - 0.1% by weight of monomer [SU 1525175].

The disadvantage of this method is the low solubility of ISS-21 caprolactam, and as a consequence the impossibility of obtaining a polymer concentrate, and low temperature started is totalcost threads, and fatigue strength of filaments of stable polycaproamide.

This object is achieved in that in the method for production of thermo - and light-stabilized polycaproamide by the polymerization of caprolactam in the presence of the stabilizer is an organic copper complex and the inhibitor deposition of copper as an organic copper complex using 1.2.3-benzotriazole copper formula

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in the amount of 0.005-0.1% by weight of monomer, and as an inhibitor deposition of copper using MgCl26H2O or AlCl36H2O in the amount of 0.012-0.1% by weight of monomer.

Example 1. The way thermo-svetozarauladocy polycaproamide by the introduction of the stabilizer in the polymer before the polymerization.

In this case, is not required prior complex, the latter is obtained in situ from prefabricated components - chloride of copper and 1,2,3-benzotriazole. To prevent release of elemental copper in the process of polymerization and degassing of polycaproamide is added magnesium chloride or aluminum chloride. In pot-stirrer to prepare the reaction mixture is loaded caprolactam melt with a temperature of 90oC, is added to the controller with many brand after which the mixture is stirred for 30 minutes. Then in 3 liters of distilled water, taken from the volume required as activator, dissolve CuCl22H2O in the amount of 0.01% by weight of caprolactam and MgCl26H2O or AlCl36H2O in the amount of 0.05% by weight of caprolactam. When this dosage is reached the concentration of the stabilizer 0.02%. The prepared solution is added to the reaction mixture, and then enter the remaining volume of water. The mixture is stirred for 30 minutes, and then subjected to polymerization, evacuation, then the process goes according to schedule. The result is a fiber linear density 1870 decitex strength 71 mn/dtex and elongation 14.5%. After soaking for 2 hours at 200oC strength is reduced to 92% of the initial elongation is reduced to 11.2%. After exposure to fluorescent lamp daytime running light (DTC-30) for 750 hours strength is reduced to 88% of the initial elongation is reduced to 12.0%. In the case of unstabilized fiber strength decreases with heat treatment to almost zero (thread "burns") and when the processing up to 11% of the original values.

Example 2. The way thermo-svetozarauladocy polycaproamide using polymer concentrate is stable the ski characteristics of polycaproamide, it can be introduced into the polymer, including the pigment of the desired color to produce the polymer concentrate in an amount up to 1.0% by weight of the polymer. For example, a mixture of granules of PA-6 with a stabilizer in the amount of 1.0% by weight of the polyamide is processed on dvuhserijnom the extruder. The obtained granulate-concentrate with a relative viscosity of 2.4-2.6 is introduced into the polymer in the amount of 0.5-10.0% by weight of the polymer, which corresponds to the stabilizer content in the final product 0.005-0.1%. There is another way: in a pot-stirrer is loaded molten caprolactam, stabilizer, pigment and stirred for 1-3 h; then the mixture is transferred to depolymerization where it is mixed with a ratio of 1:1 (by volume) with water-oligomeric mass. After 5-8 h of polymerization at a temperature of 230-250oC is obtained polymer concentrate containing pigment to 15% and stabilizer to 1.0%. Viscosity, the content of the NMS, the melt flow index of the polymer concentrate with the addition of the stabilizer is virtually indistinguishable from the performance of the concentrate without stabilizer.

Since the proposed stabilizer performs 2 functions: thermo - and sitosterolemia, these limits are dictated by the requirements of our needs for the proposed thermo-sitosterolemia are shown in table 1.

Comparative test results stabilizers N-1 (spatial hindered amine-2,2(phenylmethoxy)diethyl ether), ISS-21 and 1,2,3-benzotriazole copper are shown in table 2.

The method of obtaining thermo - and light-stabilized polycaproamide by the polymerization of caprolactam in the presence of the stabilizer is an organic copper complex and the inhibitor deposition of copper, wherein the organic copper complex using 1,2,3-benzotriazole copper II formula

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in the amount of from 0.005 to 0.1% by weight of monomer, and as an inhibitor deposition of copper MgCl26H2O or ll36H2O number 0,012 - 0,1% by weight of monomer.

 

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