CN105274649A

CN105274649A - Large-diameter PVDF-PA6 skin-core type composite monofilament and production method thereof

Info

Publication number: CN105274649A
Application number: CN201510819892.2A
Authority: CN
Inventors: 马海燕
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-11-24
Filing date: 2015-11-24
Publication date: 2016-01-27

Abstract

The invention discloses a large-diameter PVDF-PA6 skin-core type composite monofilament and a production method thereof. According to the product, PVDF serves as a skin layer, and PA6 serves as a core layer. The preparation method comprises the following steps that PVDF and PA6 are sliced and fused; a spinning manifold is composite, and is divided into two heating chambers in the longitudinal direction, and the temperatures of melts of two components are controlled; melt blending is carried out in a melt extrusion machine, extrusion is carried out, and the product is prepared through liquid cooling, stretching, heat setting and winding. The breaking strength of the PVDF/PA6 skin-core type composite monofilament ranges from 2.2 cN/dtex to 4.5 cN/dtex, the elongation at break ranges from 18% to 28%, and the diameter ranges from 0.2 mm to 5.0 mm. The process is simple and convenient, the advantages that PVDF fibers are resistant to high temperature and chemical corrosion and good in weather fastness are achieved, the advantages that PA6 fibers are high in strength and good in flexibility are achieved, and meanwhile the problem that the cost of pure PVDF fibers is high is solved.

Description

A kind of major diameter PVDF-PA6 core-skin type composite monofilament and production method thereof

Technical field

The present invention relates to a kind of major diameter PVDF-PA6 core-skin type composite monofilament and production method thereof.

Background technology

There is corresponding defect in existing PVDF fiber, PA6 fiber, how to make monofilament have both advantages separately simultaneously, becomes an important topic of this area research.

Summary of the invention

The object of the present invention is to provide major diameter PVDF-PA6 core-skin type composite monofilament and the production method thereof of a kind of simple process, good product performance.

Technical solution of the present invention is:

A kind of major diameter PVDF-PA6 core-skin type composite monofilament, it is characterized in that: PVDF is cortex, PA6 is sandwich layer; Be made up of following method: by PVDF, PA6 section melting respectively; Spinning manifold is combined type, is namely longitudinally separated into two heating clambers, controls the melt temperature of two kinds of components respectively; In melt extruder, carry out melt blending and extrude, then through liquid cools, stretching, HEAT SETTING, winding, making product; The fracture strength of PVDF/PA6 core-skin type composite monofilament is 2.2-4.5cN/dtex, and elongation at break is 18-28%, and diameter is 0.2-5.0mm.

A production method for major diameter PVDF-PA6 core-skin type composite monofilament, is characterized in that: by PVDF, PA6 section melting respectively; Spinning manifold is combined type, is namely longitudinally separated into two heating clambers, controls the melt temperature of two kinds of components respectively; In melt extruder, carry out melt blending and extrude, then through liquid cools, stretching, HEAT SETTING, winding, making product; " conduit " form of employing composite spinning jete assembly, as the PA6 component of sandwich layer, enters spinneret orifice by " conduit ", with the component PVDF compound as fibrocortex; The mass ratio of two kinds of components: PVDF10%-90%, PA6 are 10%-90%; PVDF spinning temperature is 250 DEG C-280 DEG C, and PA6 spinning temperature is 230-265 DEG C, and liquid cools temperature is 20-80 DEG C, and stretching ratio is 2.5-6 times, and draft temperature is 50-95 DEG C, and heat setting temperature is 100-200 DEG C.

The cooling fluid of liquid cools is water, glycerol, polyethylene glycol or the combination cooling liquid that is made up of 30% water, 35% glycerol, 35% polyethylene glycol (mass percent).

Present invention process is easy, has possessed the advantage of PVDF fibre fire resistant, chemical resistance, good weatherability, has also possessed the advantage that PA6 fiber strength is high, flexibility is good, also solves the problem that pure PVDF fiber cost is high simultaneously.

Below in conjunction with drawings and Examples, the invention will be further described.

Fig. 1 is the structural representation of the present invention's " conduit " form composite spinning jete assembly.

Detailed description of the invention

A production method for major diameter PVDF-PA6 core-skin type composite monofilament, by PVDF, PA6 section melting respectively; Spinning manifold is combined type, is namely longitudinally separated into two heating clambers, controls the melt temperature of two kinds of components respectively; In melt extruder, carry out melt blending and extrude, then through liquid cools, stretching, HEAT SETTING, winding, making product; " conduit " form of employing composite spinning jete assembly, as the PA6 component (B component in Fig. 1) of sandwich layer, enters spinneret orifice by " conduit ", with the component PVDF compound (component A in Fig. 1) as fibrocortex; The mass ratio of two kinds of components: PVDF10%-90%, PA6 are 10%-90%; PVDF spinning temperature is 250 DEG C-280 DEG C, and PA6 spinning temperature is 230-265 DEG C, and liquid cools temperature is 20-80 DEG C, and stretching ratio is 2.5-6 times, and draft temperature is 50-95 DEG C, and heat setting temperature is 100-200 DEG C.

The fracture strength of the PVDF/PA6 core-skin type composite monofilament obtained is 2.2-4.5cN/dtex, and elongation at break is 18-28%, and diameter is 0.2-5.0mm.

When cooling fluid adopts the combination cooling liquid be made up of 30% water, 35% glycerol, 35% polyethylene glycol (mass percent), product fracture strength is, elongation at break properties is better than adopting other cooling fluids more than 30%.

Claims

1. a major diameter PVDF-PA6 core-skin type composite monofilament, is characterized in that: PVDF is cortex, and PA6 is sandwich layer; Be made up of following method: by PVDF, PA6 section melting respectively; Spinning manifold is combined type, is namely longitudinally separated into two heating clambers, controls the melt temperature of two kinds of components respectively; In melt extruder, carry out melt blending and extrude, then through liquid cools, stretching, HEAT SETTING, winding, making product; The fracture strength of PVDF/PA6 core-skin type composite monofilament is 2.2-4.5cN/dtex, and elongation at break is 18-28%, and diameter is 0.2-5.0mm.

2. a production method for major diameter PVDF-PA6 core-skin type composite monofilament, is characterized in that: by PVDF, PA6 section melting respectively; Spinning manifold is combined type, is namely longitudinally separated into two heating clambers, controls the melt temperature of two kinds of components respectively; In melt extruder, carry out melt blending and extrude, then through liquid cools, stretching, HEAT SETTING, winding, making product; " conduit " form of employing composite spinning jete assembly, as the PA6 component of sandwich layer, enters spinneret orifice by " conduit ", with the component PVDF compound as fibrocortex; The mass ratio of two kinds of components: PVDF10%-90%, PA6 are 10%-90%; PVDF spinning temperature is 250 DEG C-280 DEG C, and PA6 spinning temperature is 230-265 DEG C, and liquid cools temperature is 20-80 DEG C, and stretching ratio is 2.5-6 times, and draft temperature is 50-95 DEG C, and heat setting temperature is 100-200 DEG C.

3. the production method of major diameter PVDF-PA6 core-skin type composite monofilament according to claim 2, is characterized in that: the cooling fluid of liquid cools is water, glycerol, polyethylene glycol or the combination cooling liquid that is made up of 30% water, 35% glycerol, 35% polyethylene glycol.