A kind of method for preparing low-temperature polyvinyl alcohol water-soluble fiber
A technology of water-soluble fiber and polyvinyl alcohol, which is applied in the direction of fiber chemical characteristics, melt spinning method, stretch spinning method, etc., can solve the problems of low usability and long dissolution time of water-soluble fiber, and achieve short production process , high yield and low water melting temperature
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Embodiment 1
[0028] The preparation method of the present embodiment polyvinyl alcohol water-soluble fiber, comprises the steps:
[0029] 1. Preparation of plasticizer
[0030] Prepare a compound plasticizer according to the mass ratio of glycerin, ethylene glycol, and N,N-dimethylformamide at 3:1:1, and mix at 40°C for 2 hours.
[0031] 2. Melt spinning
[0032] The raw material is polyvinyl alcohol powder with a degree of polymerization of 1700, a degree of alcoholysis of 99%, and a fineness of 100 mesh. The raw materials and compound plasticizer are added into the twin-screw extruder at a mass ratio of 7:3, fully melted, and then sprayed out through a 0.1mm spinneret, and the melt is cooled to obtain polyvinyl alcohol primary fibers. The temperature of each section of the screw is: feeding section 50°C, mixing section 80°C, melting section 180°C, compression section 180°C, metering section 180°C, spinneret temperature 170°C, cooling air temperature 45°C.
[0033] 3. Stretching and sh...
Embodiment 2
[0039] The preparation method of the present embodiment polyvinyl alcohol water-soluble fiber, comprises the steps:
[0040] 1. Preparation of plasticizer
[0041] Prepare a compound plasticizer according to the mass ratio of glycerin and caprolactam at 3:1, and mix at 60°C for 2.5 hours.
[0042] 2. Melt spinning
[0043] The raw material is polyvinyl alcohol powder with a degree of polymerization of 1700, a degree of alcoholysis of 88%, and a fineness of 80 mesh. The raw materials and compound plasticizer are added into the twin-screw extruder at a mass ratio of 6:4, fully melted, and then sprayed out through a 0.2mm spinneret, and the melt is cooled to obtain polyvinyl alcohol primary fibers. The temperature of each section of the screw is: feeding section 50°C, mixing section 80°C, melting section 180°C, compression section 180°C, metering section 180°C, spinneret temperature 170°C, cooling air temperature 45°C.
[0044] 3. Stretching and shaping
[0045] The as-spun f...
Embodiment 3
[0050] The preparation method of the present embodiment polyvinyl alcohol water-soluble fiber, comprises the steps:
[0051] 1. Preparation of plasticizer
[0052] Prepare a compound plasticizer according to the mass ratio of glycerin, caprolactam, and polyethylene glycol-200 at a ratio of 3:1:1, and mix at 60°C for 2 hours.
[0053] 2. Melt spinning
[0054] The raw material is polyvinyl alcohol powder with a degree of polymerization of 500, a degree of alcoholysis of 99%, and a fineness of 80 mesh. The raw materials and compound plasticizer are added into the twin-screw extruder at a mass ratio of 7:3, fully melted, and then sprayed out through a 1mm spinneret, and the melt is cooled to obtain polyvinyl alcohol primary fibers. The temperature of each section of the screw is: feeding section 50°C, mixing section 80°C, melting section 180°C, compression section 180°C, metering section 180°C, spinneret temperature 170°C, cooling air temperature 45°C.
[0055] 3. Stretching a...
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Abstract
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