Sea-island ultrafine fiber, polyurethane leather and base fabric thereof and preparation method

Abstract

The invention discloses a sea-island ultrafine fiber, polyurethane leather and base fabric thereof and preparation method. The sea-island ultrafine fiber is composed of sea component and island component; wherein the sea component is low density polyethylene, the island component is polycaprolactam, and the mass ratio of the sea component and the island component is 70:30 to 75:25. The preparation method includes that the sea-island ultrafine fiber is composed of the components by the mass ratio and is prepared by conventional technology. The polyurethane leather and base fabric thereof related by the invention are all prepared by the sea-island ultrafine fiber of the invention, and conventional preparation technology is adopted. The sea-island ultrafine fiber of the invention can recyclerelated sea phase material and reduce production cost when being used for preparing polyurethane leather and base fabric thereof.

Description

technical field

[0001] The invention belongs to the technical field of synthetic leather, in particular to a Dingdao superfine fiber, polyurethane synthetic leather and its base cloth, and a preparation method. Background technique

[0002] At present, sea-island microfibers used in the production of synthetic leather in China can be divided into indefinite island-type sea-island microfibers and fixed-island-type sea-island microfibers according to the different production technologies adopted. The islands in the indeterminate island-type sea-island microfibers are uncontrollable and discontinuous on the longitudinal axis. After solvent treatment, ultrafine fibers with thick and thin, irregular lengths and short lengths are formed; while the fixed-island-type sea-island ultrafine fibers The fiber is continuous on the longitudinal axis, and is a uniform ultrafine fiber with a fixed number of islands, a uniform fineness, and a consistent length. The number of islands in the f...

Examples

Embodiment 1

[0033] Preparation of sea-island microfibers: The sea-component low-density polyethylene chips and the island-component polycaprolactam chips are heated by their respective screw extruders according to the mass ratio of the island component to the sea component of 70:30. The temperature of the PA6 screw is 290°C, and the temperature of the PE screw is 180°C. After being extruded and melted, it becomes a spinnable melt. After the silk is produced, it is cooled and shaped by the surrounding air, and then processed through the processes of winding, bunching, drawing, crimping, shaping and cutting to obtain sea-island ultra-fine fibers. Wherein, the density of the sea component low-density polyethylene is 0.915g / cm 3 , the melt index is 4.3g / min; the relative viscosity of the island component polycaprolactam is 2.76η.γ.

[0034] After testing, the prepared island-in-the-sea microfibers are 4.4-denier fixed-island type sea-island ultrafine fibers.

[0035] Preparation of polyuret...

Embodiment 2

[0042] Preparation of sea-island microfibers: The sea-component low-density polyethylene chips and the island-component polycaprolactam chips are heated according to the mass ratio of the island component to the sea component of 75:25, respectively, through their respective screw extruders, Among them, the temperature of PA6 screw is 290°C, and that of PE screw is 180°C. After being extruded and melted, it becomes a spinnable melt. After the silk is produced, it is cooled and shaped by the surrounding air, and then processed through the processes of winding, bunching, drawing, crimping, shaping and cutting to obtain sea-island ultra-fine fibers. Wherein, the density of the sea component low-density polyethylene is 0.940g / cm 3 , the melt index is 5.7g / min; the relative viscosity of the island component polycaprolactam is 2.84η.γ.

[0043] After testing, the prepared island-in-the-sea microfibers are 4.4-denier fixed-island type sea-island ultrafine fibers.

[0044] Preparatio...

Embodiment 3

[0051] Preparation of sea-island microfibers: The sea-component low-density polyethylene chips and the island-component polycaprolactam chips are heated according to the mass ratio of the island component to the sea component of 75:25, respectively, through their respective screw extruders, The temperature of the PA6 screw is 275°C, and the temperature of the PE screw is 225°C. After being extruded and melted, it becomes a spinnable melt. After the silk is produced, it is cooled and shaped by the surrounding air, and then processed through the processes of winding, bunching, drawing, crimping, shaping and cutting to obtain sea-island ultra-fine fibers. Wherein, the density of the sea component low-density polyethylene is 0.925g / cm 3 , the melt index is 5.0g / min; the relative viscosity of the island component polycaprolactam is 2.80η.γ.

[0052] After testing, the prepared island-in-the-sea microfibers are 4.4-denier fixed-island type sea-island ultrafine fibers.

[0053] Pre...

technical field

[0001] The invention belongs to the technical field of synthetic leather, in particular to a Dingdao superfine fiber, polyurethane synthetic leather and its base cloth, and a preparation method. Background technique

[0002] At present, sea-island microfibers used in the production of synthetic leather in China can be divided into indefinite island-type sea-island microfibers and fixed-island-type sea-island microfibers according to the different production technologies adopted. The islands in the indeterminate island-type sea-island microfibers are uncontrollable and discontinuous on the longitudinal axis. After solvent treatment, ultrafine fibers with thick and thin, irregular lengths and short lengths are formed; while the fixed-island-type sea-island ultrafine fibers The fiber is continuous on the longitudinal axis, and is a uniform ultrafine fiber with a fixed number of islands, a uniform fineness, and a consistent length. The number of islands in the f...

Examples

Embodiment 1

[0033] Preparation of sea-island microfibers: The sea-component low-density polyethylene chips and the island-component polycaprolactam chips are heated by their respective screw extruders according to the mass ratio of the island component to the sea component of 70:30. The temperature of the PA6 screw is 290°C, and the temperature of the PE screw is 180°C. After being extruded and melted, it becomes a spinnable melt. After the silk is produced, it is cooled and shaped by the surrounding air, and then processed through the processes of winding, bunching, drawing, crimping, shaping and cutting to obtain sea-island ultra-fine fibers. Wherein, the density of the sea component low-density polyethylene is 0.915g / cm 3 , the melt index is 4.3g / min; the relative viscosity of the island component polycaprolactam is 2.76η.γ.

[0034] After testing, the prepared island-in-the-sea microfibers are 4.4-denier fixed-island type sea-island ultrafine fibers.

[0035] Preparation of polyuret...

Embodiment 2

[0042] Preparation of sea-island microfibers: The sea-component low-density polyethylene chips and the island-component polycaprolactam chips are heated according to the mass ratio of the island component to the sea component of 75:25, respectively, through their respective screw extruders, Among them, the temperature of PA6 screw is 290°C, and that of PE screw is 180°C. After being extruded and melted, it becomes a spinnable melt. After the silk is produced, it is cooled and shaped by the surrounding air, and then processed through the processes of winding, bunching, drawing, crimping, shaping and cutting to obtain sea-island ultra-fine fibers. Wherein, the density of the sea component low-density polyethylene is 0.940g / cm 3 , the melt index is 5.7g / min; the relative viscosity of the island component polycaprolactam is 2.84η.γ.

[0043] After testing, the prepared island-in-the-sea microfibers are 4.4-denier fixed-island type sea-island ultrafine fibers.

[0044] Preparatio...

Embodiment 3

[0051] Preparation of sea-island microfibers: The sea-component low-density polyethylene chips and the island-component polycaprolactam chips are heated according to the mass ratio of the island component to the sea component of 75:25, respectively, through their respective screw extruders, The temperature of the PA6 screw is 275°C, and the temperature of the PE screw is 225°C. After being extruded and melted, it becomes a spinnable melt. After the silk is produced, it is cooled and shaped by the surrounding air, and then processed through the processes of winding, bunching, drawing, crimping, shaping and cutting to obtain sea-island ultra-fine fibers. Wherein, the density of the sea component low-density polyethylene is 0.925g / cm 3 , the melt index is 5.0g / min; the relative viscosity of the island component polycaprolactam is 2.80η.γ.

[0052] After testing, the prepared island-in-the-sea microfibers are 4.4-denier fixed-island type sea-island ultrafine fibers.

[0053] Pre...