Method for producing phosphorus copolymerized flame-retarding terylene high-strength industrial yarns

A technology of flame retardant and production method of copolymerization, which is applied in the field of polyester spinning, can solve the problems that the esterification temperature cannot be too high, the decomposition of flame retardant affects the flame retardant effect, and the difficulty of increasing the melt viscosity, etc., so as to reduce dyeing Effects of cost, intrinsic viscosity reduction, and high hydrolytic stability

CN102199807AActive Publication Date: 2011-09-28ZHEJIANG GUXIANDAO POLYESTER DOPE DYED YARN CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-09-28

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Abstract

The invention discloses a method for producing phosphorus copolymerized flame-retarding terylene high-strength industrial yarns, which is characterized by comprising the following steps: pumping ethylene glycol (EG) and purified terephthalic acid (PTA) into a pulping kettle according to a molar ratio of 1.15 for pulping; after uniform pulping, transferring the uniform pulp into an esterification kettle for esterification; after the esterification is accomplished, adding blended liquid of a flame retardant, uniformly mixing, and adding the mixture into a polymerization kettle; after the polymerization is accomplished, discharging and cutting to obtain flame-retarding polyester chips with a viscosity of 0.61; feeding the prepared flame-retarding polyester chips into a solid-phase polymerization system, and improving the viscosity to 0.90 to 1.10; and melting at a high temperature into molten spinning solution in a screw extruder, spinning by a spinning component, drawing, and thermally setting to obtain phosphorus copolymerized flame-retarding terylene high-strength industrial yarns. In the invention, a copolymerized flame-retarding modification process is used for flame-retarding modification of the polyester, and the obtained terylene industrial yarns have high strength and a permanent flame-retarding property.
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Description

Technical field:

[0001] The invention designs a production method of flame-retardant polyester industrial yarn, in particular a production method of phosphorus-based copolymerized flame-retardant polyester high-strength industrial yarn, and belongs to the technical field of polyester spinning. technical background:

[0002] According to the production process and the introduction of flame retardants, the flame retardant modification methods of polyester can be summarized into the following five types: (1): adding reactive flame retardants in the transesterification or polycondensation stage for co-condensation; (2): in Adding an additive flame retardant to the melt before melt spinning; (3): Composite spinning with ordinary polyester and polyester containing flame retardant components; (4): Reactive flame retardant on polyester or fabric Carry out graft copolymerization; (5): polyester fabric carries out flame-retardant post-treatment. Methods (1) to (3) belong to flame-ret...

Examples

Embodiment 1

[0026] Example 1: Preparation of flame-retardant polyester chips with an intrinsic viscosity of 0.61 dL / g.

[0027] Add 75kg of EG to the preparation tank, add 25kg of flame retardant UKANOL®ES under stirring conditions, and raise the temperature to 150°C to obtain an ethylene glycol preparation solution with a flame retardant mass content of 25%. Add EG and PTA to the beating tank at a molar ratio of 1.15 for beating. After beating evenly, it will be continuously entered into the esterification tank for two-step esterification. The esterification temperature and pressure are 256°C, 80kPa, 267°C, and 4kPa, respectively. After the esterification is completed, move it into a polymerization tank, and fully mix it with the flame retardant preparation solution. After mixing evenly, perform precondensation at 277°C and 8.8kPa, and then carry out polymerization at 283°C and 1.0kPa to obtain a flame retardant polyester slice.

Embodiment 2

[0028] Example 2: The flame-retardant polyester chips synthesized in Example 1 with an intrinsic viscosity of 0.61 dL / g were used to produce polyester industrial yarns with a specification of 1110 dtex / 192f.

[0029] Feed the flame-retardant polyester chips prepared in Example 1 into the solid-state polymerization system, dry and crystallize at 160-180°C, and make the molecular chains The terminal group undergoes polycondensation reaction again to obtain a high molecular weight polymer, and the viscosity is increased to between 0.90-1.10; the high-viscosity flame-retardant polyester chips obtained after solid-state polymerization are melted into a molten state at a high temperature in a screw extruder The temperature of the spinning melt and each zone of the screw is 275°C, 275°C, 270°C, 270°C, 270°C. After static mixing, it is fully mixed during the conveying process, and then it is sprayed by high pressure of 13-30MPa in the spinning assembly. Filament, the spinning temperat...

Embodiment 3

[0030] Example 3: The flame-retardant polyester chips synthesized in Example 1 were used to produce polyester industrial yarns with a specification of 555dtex / 96f.

[0031] The preparation process of flame-retardant polyester chips and the solid-state polymerization process are the same as in Example 2, the difference is that the high-viscosity flame-retardant polyester chips obtained after solid-state polymerization are melted at high temperature in a screw extruder into a molten state spinning melt The temperature of each zone of the body and the screw is 275°C, 275°C, 270°C, 270°C, 270°C. After static mixing, it is fully mixed during the conveying process, and then it is sprayed into filaments by high pressure of 13-30MPa in the spinning assembly. The spinning temperature is 278°C, and the filaments are uniformly cooled by air-conditioned air with a temperature of 20±2°C, a humidity of 60±5%, and a speed of 0.4m / s to form primary fibers; After being coated with 0.5-1.0% hig...