CN112796131A

CN112796131A - Glass fiber rope for reinforcing polyethylene pipeline and preparation method thereof

Info

Publication number: CN112796131A
Application number: CN202011609264.9A
Authority: CN
Inventors: 邵将; 陈禹七
Original assignee: Tiangu Xincai Chengdu Technology Co ltd
Current assignee: Tiangu Xincai Chengdu Technology Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-05-14

Abstract

The invention discloses a glass fiber rope for reinforcing a polyethylene pipeline and a preparation method thereof, wherein the surface of a glass fiber bundle of the glass fiber rope is coated with modified polyethylene: the modified polyethylene comprises the following components in parts by weight: 100 parts of high-density polyethylene (HDPE), 20 parts of nylon 6, 30 parts of TPV and 10 parts of Ethylene Propylene Diene Monomer (EPDM). The glass fiber rope has the advantages of light weight, high tensile strength, good toughness, small creep deformation, good heat resistance, uniform glass fiber distribution, stable mechanical property, recyclability and the like, can be directly wound and woven, and can be used for reinforcing thermoplastic pipelines such as polyethylene pipes and the like.

Description

Glass fiber rope for reinforcing polyethylene pipeline and preparation method thereof

Technical Field

The invention relates to a glass fiber rope, in particular to a glass fiber rope for reinforcing a polyethylene pipeline and a preparation method thereof.

Background

The glass fiber is an inorganic non-metallic material, is brittle and non-wear-resistant, and cannot be directly used as a reinforcing material of the polyethylene composite pipe.

However, after HDPE is melted by heating, the melt viscosity is high, so that the glass fiber cannot be effectively wetted, and thus it is difficult to coat the surface of the glass fiber with resin. In addition, effective interfacial adhesion between the matrix resin and the glass fiber cannot be formed, so that the tensile strength of the glass fiber is low, as shown in table 1, the mechanical strength of the glass fiber which is not coated with the resin and the composite fiber in which the surface of the glass fiber is directly coated with the HDPE are compared, and as seen from table 1, the performance of the glass fiber coated with the HDPE is not obviously improved. Moreover, the maximum bearable wrap angle of the glass fiber on the tension roller is obviously reduced from 60 degrees to 5-10 degrees, which means that the flexibility of the glass fiber is obviously reduced, therefore, the HDPE directly coating the glass fiber is not suitable for being used as a winding forming process of the reinforced polyethylene pipeline.

Table 1 shows the comparison of mechanical strength between glass fibers not coated with a resin and composite fibers in which HDPE was directly coated on the surface of the glass fibers (sample diameters were 2.5mm)

Disclosure of Invention

The invention aims to provide a glass fiber rope for reinforcing a polyethylene pipeline and a preparation method thereof, which solve the problem of difficult compounding of glass fiber and polyethylene and can realize uniform compounding of the glass fiber and the polyethylene.

In order to achieve the above object, the present invention provides a glass fiber rope for reinforcing a polyethylene pipe, the surface of the glass fiber bundle of the glass fiber rope being coated with a modified polyethylene: the modified polyethylene comprises the following components in parts by weight: 100 parts of high-density polyethylene, 20 parts of nylon 6, 30 parts of thermoplastic vulcanized rubber and 10 parts of ethylene propylene diene monomer.

Preferably, the mass percent of the glass fiber is 60-85%.

Preferably, the diameter of the glass fiber rope is 1-3 mm.

Preferably, the thickness of the glass fiber bundle is 600-4800 tex.

Preferably, the strength of the glass fiber rope is greater than 700 MPa.

Another object of the present invention is to provide a method for preparing the glass fiber rope, which comprises: uniformly mixing 100 parts of high-density polyethylene, 20 parts of nylon 6, 30 parts of TPV (thermoplastic vulcanizate) and 10 parts of ethylene propylene diene monomer rubber, extruding the mixed raw materials into a glue dipping tank by using a double-screw extruder, wherein the temperature of the glue dipping tank is 200-300 ℃, and dispersing glass fiber bundles in the glue dipping tank through a tension roller to enable the glass fiber bundles to be in contact with the molten modified high-density polyethylene in the glue dipping tank; the number of the tension rollers is 3-5, the diameter of the tension rollers is 15-30 mm, and the wrap angle between the glass fiber bundle and the tension rollers is 15-60 degrees; and after the glass fiber bundle is completely impregnated, drawing and winding by using a take-up machine, wherein the drawing speed is 13-20 m/min, the diameter of a single fiber of the impregnated glass fiber bundle is 10-24 mu m, and the thickness of the glass fiber bundle is 600-4800 tex.

The glass fiber rope for reinforcing a polyethylene pipeline and the preparation method thereof solve the problem of difficult compounding of glass fiber and polyethylene, and have the following advantages:

the glass fiber rope for reinforcing the polyethylene pipeline has the advantages of light weight, high tensile strength (the strength of the glass fiber rope is more than 700MPa), good toughness, small creep deformation, good heat resistance, uniform glass fiber distribution, stable mechanical property, recyclability and the like, can be directly wound and woven, and can be used for reinforcing thermoplastic pipelines such as polyethylene pipes and the like.

Drawings

FIG. 1 is a pictorial representation of a fiberglass rope for reinforcing a polyethylene pipe made in accordance with the present invention.

FIG. 2 is an electron micrograph of the dipping effect of the present invention.

FIG. 3 is a graph showing the effect of the diameter of the glass fiber rope of the present invention on the tensile strength.

FIG. 4 is a graph showing the effect of PA6 of the present invention on the tensile Strength of HDPE.

FIG. 5 shows the effect of TPV of the present invention on the tensile strength of HDPE/PA 6.

FIG. 6 is a graph showing the effect of TPV of the present invention on the melt flow rate of HDPE/PA 6.

FIG. 7 is a graph showing the effect of EPDM of the present invention on the tension roll wrap angle of HDPE/PA 6/TPV.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The surface of an alkali-free glass fiber bundle of the glass fiber rope is coated with a layer of modified polyethylene, the mass percentage of the alkali-free glass fiber is 60-85%, the diameter of the glass fiber rope is 0.5-3 mm, the diameter of a single fiber of the glass fiber bundle is 10-24 mu m, the thickness of the alkali-free glass fiber bundle is 600-4800 tex (tex), and the strength of the glass fiber rope is more than 800 MPa.

The modified polyethylene comprises the following components in parts by weight: 100 parts of HDPE (High Density Polyethylene), 20 parts of PA6(Polyamide 6, nylon 6), 30 parts of TPV (Thermoplastic Vulcanizate), 10 parts of EPDM (Ethylene Propylene Diene Monomer). HDPE is matrix resin, PA6 adds the intensity of reinforcing matrix resin, TPV's addition reduces matrix resin viscosity and improves glass fiber's infiltration effect, EPDM rubber's addition promotes glass fiber's compliance, through HDPE and PA6, TPV and EPDM's interact, has not only improved glass fiber's tensile strength, has strengthened its toughness simultaneously, and modified polyethylene can evenly cladding on glass fiber's surface moreover.

The preparation method of the glass fiber rope comprises the following specific steps:

100 parts of HDPE, 20 parts of PA6, 30 parts of TPV and 10 parts of EPDM are uniformly mixed, the uniformly stirred batch is extruded into a glue dipping tank by a double-screw extruder, the temperature of the glue dipping tank is kept at 200-300 ℃, and glass fiber bundles are dispersed in the glue dipping tank through a tension roller and are fully contacted with molten modified resin in the glue dipping tank. The number of the tension rollers is 3-5, the diameter is 15-30 mm, and the wrap angle between the glass fiber bundle and the tension roller is 15-60 degrees.

And (3) after the glass fiber bundle is soaked in the dipping tank, pulling and rolling the glass fiber bundle by using a take-up machine, wherein the pulling speed is 13-20 m/min. After impregnation, the diameter of a single fiber of the glass fiber bundle is 10-24 μm, the thickness of the glass fiber bundle is 600-4800 tex, the diameter of the glass fiber rope is 1-3 mm, see fig. 3, for the influence of the diameter of the glass fiber rope on the tensile strength, it can be seen that when the diameter of the glass fiber rope is more than 1mm, the tensile strength (tensile strength h) of the glass fiber rope can be more than 700MPa, which is obviously superior to unmodified HDPE.

As shown in fig. 2, which is an electron microscope image of the impregnation effect of the present invention, it can be seen that the modified resin achieves good impregnation of the glass fibers, the glass fiber filaments are uniformly distributed in the modified matrix resin (B in fig. 2), and good interfacial bonding is formed between the modified resin and the glass fiber surface, providing high interfacial bonding force (a in fig. 2).

Table 2 shows the modified HDPE of the invention and the comparison of the glass fiber ropes prepared with the unmodified samples (the sample diameters are all 2.5mm)

The modified polyethylene of the invention is compared with the performances of materials under different modification conditions, and the comparison result is as follows:

as shown in fig. 4, the effect of the content of PA6 on the tensile strength of HDPE is shown, and it can be seen from the figure that the tensile strength of PA6 modified HDPE increases with the increase of PA6 content, and the performance is best at 20 parts of PA6 content, and when the content of PA6 is further increased, the mechanical properties of PA6 modified HDPE obviously deteriorate.

As shown in fig. 5, the effect of TPV on the mechanical properties of the modified HDPE is shown, and it can be seen from the figure that when the modified HDPE contains 100 parts of HDPE and 20 parts of PA6, the tensile strength of the material is continuously reduced due to the addition of TPV, but at the same time, the melt flow rate of the modified HDPE (see fig. 6) is rapidly increased, which can effectively enhance the wetting effect of the glass fiber. When the content of TPV in the modified HDPE is 30 parts, the modified HDPE has higher melt flow rate, and good tensile strength is maintained. However, the modified HDPE of PA6 and TPV (100 parts HDPE, 20 parts PA6 and 30 parts TPV) has satisfactory flexibility (tension roll wrap angle) despite good tensile strength and high melt flow rate.

As shown in fig. 7, showing the effect of the content of EPDM on the flexibility of the modified HDPE, it can be seen that there is a significant increase in the flexibility of the modified HDPE when the content of EPDM is 10 parts, but thereafter, the flexibility of the modified HDPE does not change significantly although the content of EPDM is further increased. Therefore, the flexibility of HDPE is improved by using EPDM, and the content of EPDM is 10 parts.

In conclusion, the glass fiber rope has the advantages of light weight, high tensile strength, good toughness, small creep deformation, good heat resistance, uniform glass fiber distribution, stable mechanical property, recyclability and the like, can be directly wound and woven, and can be used for reinforcing thermoplastic pipelines such as polyethylene pipes and the like.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims

1. A glass fiber rope for reinforcing a polyethylene pipe, wherein the surface of the glass fiber bundle of the glass fiber rope is coated with modified polyethylene:

the modified polyethylene comprises the following components in parts by weight: 100 parts of high-density polyethylene (HDPE), 20 parts of nylon 6, 30 parts of TPV and 10 parts of Ethylene Propylene Diene Monomer (EPDM).

2. The glass fiber rope according to claim 1, wherein the glass fiber is 60 to 85 mass%.

3. The glass fiber rope according to claim 1, wherein the glass fiber rope has a diameter of 1 to 3 mm.

4. The glass fiber rope according to claim 1, wherein the thickness of the glass fiber bundle is 600 to 4800 tex.

5. The glass fiber rope according to claim 1, wherein the tensile strength of the glass fiber rope is greater than 700 MPa.

6. The method of producing a glass fiber strand as claimed in any one of claims 1 to 5, comprising:

uniformly mixing 100 parts of high-density polyethylene (HDPE), 20 parts of nylon 6, 30 parts of TPV and 10 parts of Ethylene Propylene Diene Monomer (EPDM), extruding the mixed raw materials into a glue dipping tank by using a double-screw extruder, wherein the temperature of the glue dipping tank is 200-300 ℃, and dispersing glass fiber bundles in the glue dipping tank by using a tension roller to enable the glass fiber bundles to be in contact with the molten mixed raw materials in the glue dipping tank; the number of the tension rollers is 3-5, the diameter of the tension rollers is 15-30 mm, and the wrap angle between the glass fiber bundle and the tension rollers is 15-60 degrees;

after the glass fiber bundle is soaked in the dipping tank, a take-up machine is used for drawing and rolling, the drawing speed is 13-20 m/min, the diameter of a single fiber of the soaked glass fiber bundle is 10-24 mu m, and the thickness of the glass fiber bundle is 600-4800 tex.