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Process for the production of acrylic or modacrylic fibers

A technology of acrylonitrile and acrylonitrile, which is applied in the field of spinning solutions for producing acrylonitrile or modified acrylonitrile fibers, and can solve problems such as heavy production processes

Inactive Publication Date: 2017-09-19
MONTEFIBRE MAE TECH SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, even in the presence of such reduced amounts of water, there may still be some disadvantages related to the type of polymer and the chosen spinning technique: in fact, the presence of water may prove to be critical for obtaining certain properties (related to the end use) is optimal) fibers are not desired, so water needs to be removed by distillation or similar techniques, which makes the whole production process more onerous

Method used

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  • Process for the production of acrylic or modacrylic fibers
  • Process for the production of acrylic or modacrylic fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] High molecular weight acrylonitrile copolymer (MWn= 75,000-100,000) of dissolution

[0067] The polymer was fed together with DMSO in powder form to a single screw extruder at a temperature of 5 °C as figure 1 Heat as shown. Feeding the polymer and solvent to an extruder is done in an industrial line to produce a spinning solution for acrylonitrile polymers. The production line consists of the following:

[0068] - storage silos for acrylonitrile polymers;

[0069] - "weight loss" metering equipment for continuous mode of polymer flow ( figure 1 element "4" in );

[0070] - equipment for the preparation of solid DMSO in powder form ( figure 1 Elements 7, 8, 12 and 14 in );

[0071] - equipment for metering DMSO in powder form in continuous mode ( figure 1 element in 15);

[0072] - Static mixer for homogenizing spinning dope ( figure 1 element 18 in );

[0073] - Cooling exchanger for stabilizing the temperature of spinning dope;

[0074] - tanks for degassi...

Embodiment 2

[0105] Embodiment 2 (comparison)

[0106] High molecular weight acrylonitrile copolymer (MWn =75,000-100,000) of dissolution

[0107] The polymer was dispersed in a 100% DMSO solution maintained at a temperature of 20°C.

[0108] The dissolution of the polymer in solvent solution was carried out in the same industrial line as used in Example 1.

[0109] The dissolving condition of described polymer in solvent solution is as follows:

[0110] - polymer flow rate 250kg / h at room temperature;

[0111] - using a cooling group to maintain a flow rate of 1,000 kg / h of solvent (DMSO 100%) at T = 20°C;

[0112] - The temperature of the solution leaving the heat exchanger is 88°C;

[0113] - Solution temperature 70°C leaving the cooling exchanger.

[0114] The viscosity of the produced spinning dope measured using a rotational viscometer as in Example 1 was equal to 340 poise at 70°C.

[0115] The increase in ΔP using the filterability test proved to be equal to 4.2 ate / h. This...

Embodiment 3

[0119] Dissolution of acrylonitrile copolymers of medium molecular weight (MWn = 40,000-55,000) consisting of acrylonitrile and vinyl acetate (93 / 7 by weight, relative to the total weight of the polymer) for textile applications

[0120] According to the procedure described in Example 1, the polymer was mixed with DMSO in powder form at a temperature of 5°C.

[0121] The dope thus produced was characterized by a viscosity of about 235 poise at 70°C.

[0122] Using a "ROTOVISCO" Haake rotational viscometer with a MCV2 cylindrical rotor in a thermostatically controlled unit, and also using a viscometer according to Hoppler, verifying the time for the steel ball to fall into the polymer solution, the viscosity measurement was carried out, which showed that at 50°C Below is equal to a viscosity of 430 poise.

[0123] The mixing of the polymer and DMSO in powder form was carried out in an industrial line to produce a spinning solution for the acrylonitrile polymer, which was the s...

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Abstract

A process is described for the preparation of a homogeneous spinning solution for the production of acrylic or modacrylic fibers which comprises the following steps: i) preparation of an intimate mixture of a homopolymer or copolymer of acrylonitrile in powder form with a solid solvent in powder form, at a temperature lower than the melting point of the solid solvent; ii) gradually heating the intimate mixture of solids coming from step i) to a temperature ranging from 70 DEG C to 150 DEG C in a time ranging from 0.5 to 30 minutes, until the complete dissolution of the homopolymer or copolymer in the solvent and the formation of a homogeneous spinning solution. Said spinning solution is then fed to a storage tank or to the spinning line.

Description

technical field [0001] The present invention relates to a method for producing acrylonitrile or modacrylic fibers, in particular to a method for preparing spinning solutions for the production of acrylonitrile or modacrylic fibers. Summary of the invention [0002] The present invention falls within the field of production of acrylonitrile fibers, which involves the preparation of homopolymers or copolymers from acrylonitrile, wherein the copolymer is mainly composed of acrylonitrile (90-99% by weight, relative to the total weight of the polymer) and relative to The total weight of the polymer typically consists of 1-10% by weight of one or more other comonomers. [0003] Preferred comonomers are neutral vinyl molecules (e.g. methyl acrylate, methyl methacrylate, vinyl acetate, acrylamide, etc.) and molecules with one or more acid groups (e.g. acrylic acid, itaconic acid , sulfonated styrene, etc.), or other comonomers suitable for imparting different physicochemical proper...

Claims

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Application Information

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IPC IPC(8): D01F6/38D01D1/02D01D1/10D01D5/06
CPCD01D1/02D01D1/103D01D1/106D01D5/06D01F6/38C08J3/11D01F6/18D01F6/40C08J3/097C08J2333/20D10B2321/101
Inventor F·弗兰卡兰茨M·马瑞内蒂R·普洛塞尔皮奥
Owner MONTEFIBRE MAE TECH SRL
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