Preparation and Properties of Polypropylene Filament Geotextile
Abstract: This paper proposes a new method for producing polypropylene filament wholesale polyester nonwoven geotextile: high-strength and non-twisted polypropylene filament fibers are used, and the principle of electrostatic separation is used to separate the filaments, and then the filaments are formed into a net and needle-punched to prepare polypropylene. Silk polyester nonwoven geotextile for sale. The effects of the separation effect on the quality of the final product were discussed. The weight, thickness, tensile strength, tear strength, burst strength, vertical permeability and effective pore size of the finished samples were tested and analyzed. The results show that the performance of the sample exceeds the requirements of national standards, and the comprehensive performance has better application potential than the existing products in the market.
Keywords: polypropylene filament; wholesale polyester nonwoven geotextile; process; performance
Geotextile is a basic material used in the construction of civil engineering infrastructure and belongs to the category of geosynthetic materials. Depending on the type of fabric, including woven fabrics, non-woven fabrics, and knitted polyester nonwoven geotextile for sale, it has important functions such as filtration, drainage, reinforcement, protection, and isolation. It is widely used in landfills, roads, railways, tunnels, and enclosures. Structure, dam, reservoir, dam, coast, and other projects. Among them, non-woven wholesale polyester nonwoven geotextile can be divided into spunbonded needle-punched nonwoven polyester nonwoven geotextile manufacturers, stapled needle-punched nonwoven polyester nonwoven geotextile factory price, hot-melt bonded nonwoven high quality polyester nonwoven geotextile, and composite types according to different methods of web forming and reinforcement. Geotechnical materials, etc.
Spunbond needle-punched high quality polyester nonwoven geotextile mainly include polyester spunbond needle-punched polyester nonwoven geotextile manufacturers and polypropylene spunbond needle-punched geotextiles. Compared with the two, the polypropylene polyester nonwoven geotextile factory price has good acid and alkali resistance, and the polyester wholesale polyester nonwoven geotextile has good UV resistance, but most of the polyester nonwoven geotextile manufacturers are not directly exposed to sunlight. In the United States, Europe, Japan, and other developed countries and regions, the proportion of polypropylene in filament spunbonded needle-punched high quality polyester nonwoven geotextile are about 30% to 40%; however, due to technical reasons, etc., spunbond needle-punched polyester nonwoven geotextile factory price is used in China. The raw materials are basically polyester. At present, only Shaoxing Lida Nonwovens Co., Ltd. and Tiandingfeng Nonwovens Co., Ltd. have opened a polypropylene spunbond needled polyester nonwoven geotextile for sale production line.
Different from the preparation process of traditional spunbonded needle-punched high quality polyester nonwoven geotextile, this paper directly selects high-strength polypropylene non-twisted filaments, and uses the principle of electrostatic separation to separate the filaments, and then lays up the web and acupuncture reinforcement to prepare a good one. Application of polypropylene filament polyester nonwoven geotextile for sale.
1 Sample preparation
The process steps for preparing a polypropylene filament wholesale polyester nonwoven geotextile are shown in Figure 1. Firstly, the creel is used to unwind the continuous filaments of polypropylene (the wind pressure in the drafter is used as the forward power), and then the high-voltage electrostatic field is used to make the long ribbons have the same kind of electric charge and mutually repel each other; then the filament fibers are separated. The yarn feeder is fed into the drafting of the tubular drafter, and the filament fiber is evenly dispersed by the pendulum device, and the expanded fiber web is laid on the mesh curtain, and then the pre-needling and the main needling are successively strengthened. Finally, the edges are cut into rolls and made into polyester nonwoven geotextile for sale.
Figure 1 Flow chart of polypropylene filament wholesale polyester nonwoven geotextile production process
2 characterization of filaments and analysis of influencing factors
The key to the preparation of the polypropylene filament polyester nonwoven geotextile for sale in this paper is the splitting, that is, a bundle of filaments is unwound from the bobbin and laid into a web, and the tow is divided into a monofilament or a smaller tow. The greater the degree of separation, the more uniform the web is formed and the better the product quality. Therefore, four different specifications of non-twisted polypropylene filaments were selected in this study (see Table 1 for specific parameters) to characterize and analyze the separation effect and its influencing factors.
2.1 Separation of wire effect
Using GASOSUO microscope measurement software, first select 100 different positions in a bundle of filament fibers (original silk), measure the diameter, take the average value as the diameter of the original silk; then select 100 different parts in the web after the splitting The diameter of the tow is measured and averaged as the diameter of the tow in the web. This paper defines the “filament ratio” α to characterize the separation effect, calculated as equation (1).
Wherein, α is the dividing ratio, %; D0 is the diameter of the raw silk, mm; D1 is the diameter of the tow in the web, mm. The smaller α, the better the separation effect.
2.2 Factors affecting the effect of splitting
2.2.1 Influence of monofilament fineness on the effect of the split yarn
Under the same wind pressure and voltage, four kinds of polypropylene filaments, the wire separation effect is shown in Table 1. It can be seen from Table 1 that the 1# polypropylene raw silk has the best separation effect and the 3# is the worst. This is because in the process of forming the web by the split yarn, the smaller the bending rigidity of the monofilament in the original yarn, the easier the entanglement of the monofilament is, which is not conducive to the separation polyester nonwoven geotextile factory price; the thicker the monofilament in the original filament, the bending rigidity The bigger the wire, the better the wire separation effect. In addition, the fineness of the monofilament in the 1# and 4# raw yarns is the same, and the density of the 1# raw silk thread is twice the density of the 4# original silk thread (that is, the number of monofilaments in the 1# raw silk is 2 times that of 4#) However, the average diameter of the tows in the web formed by the two after splitting is similar. It shows that the density of the original silk has little effect on the silk separation effect in the case where the fineness of the monofilament in the original yarn is the same.
Table 1 Different specifications of polypropylene filament yarn separation effect
2.2.2 Influence of drafting pipe wind pressure and voltage on the split wire effect
The wind pressure in the drafting pipe can not only serve as the driving force for the original yarn but also can blow away the original yarn and have a certain auxiliary wire separation function. Before the raw silk enters the drafting tube, the fibers are charged with the same kind of electric charge by a high-voltage electric field, thereby mutually repelling and contributing to the separation of the filaments. Table 2 shows the effect of 1# raw silk under the same voltage and different wind pressure and the same wind pressure and different voltage.
Table 2 Different wind pressure and voltage splitting effects
It is concluded from Table 2 that the larger the wind pressure, the better the effect of the wire separation, but the effect is not significant. The wind pressure increases from 0.4 kPa to 0.7 kPa, and the wire separation ratio decreases from 8% to 7.5%. The reason is that the wind pressure can blow off the filaments polyester nonwoven geotextile factory price, but at the same time it can also drive the filaments to rotate, which is not conducive to the separation. In addition, it is concluded from Table 2 that the larger the voltage, the better the wire separation effect, but the effect of increasing the voltage on the wire after the voltage is increased to a certain value is no longer significant. This is because the higher the voltage, the higher the electric field strength, the larger the fiber charge, the better the wire separation effect; when the fiber charge is saturated, the voltage is increased, and the wire separation effect does not change much.
2.3 Split wire process parameters
According to the above analysis, it is determined that the process parameters of the final preparation of the polypropylene filament needle-punched wholesale polyester nonwoven geotextile are 1# filament, the wind pressure is 0.6 kPa, and the voltage is 30 kV.
3 Product performance testing and analysis
3.1 Performance test
In the standard temperature and humidity environment (temperature 20 °C, relative humidity 65%), three kinds of polypropylene filament polyester nonwoven geotextile for sale with different acupuncture densities and polypropylene spunbond needle-punched wholesale polyester nonwoven geotextile produced by a domestic company Ester spunbonded needle high quality polyester nonwoven geotextile was tested for various properties.
Using CP4202C electronic balance, according to GB/T 13762-2009 “geosynthetic material geotextile and polyester nonwoven geotextile factory price product unit area quality measurement method” to test the weight; using FY080-II geotextile synthetic material thickness tester, in accordance with GB /T 13761.1—2009 “Determination of the thickness of geosynthetics under specified pressures. Part 1: Methods for the determination of the thickness of single-layer products.” The thickness is tested. The YT010-1000 electronic polyester nonwoven geotextile for sale integrated strength machine is used according to GB/T 15788— 2005 “high quality polyester nonwoven geotextile and related products wide strip tensile test” to test the tensile properties; using YT010-1000 electronic geotextile comprehensive strength machine, according to GB/T 13763-2010 “geosynthetic material trapezoidal method tearing strong Test “Tear strength test”; using YT010-1000 electronic geotextile comprehensive strength machine, according to GB/T 14800-2010 “Static cracking test of geosynthetics (CBR method)” to test the bursting strength; using FY020 wholesale polyester nonwoven geotextile vertical permeable tester, according to GB/T 15789-2005 “Measurement of vertical permeability of polyester nonwoven geotextile manufacturers and related products without load” The vertical permeability is tested; the effective pore size is tested according to GB/T 17634-1998 “Determination of effective pore size of high quality polyester nonwoven geotextile and related products” by the TSY-2 geotextile effective pore size measuring instrument.
3.2 Performance Analysis
The specifications and performance test results of three different needle-punched polypropylene filament needle-punched polyester nonwoven geotextile for sale and polypropylene spunbond needle-punched geotextiles and polyester spunbond needle-punched polyester nonwoven geotextile factory price produced by a company are shown in the table. 3 is shown.
Table 3 Specifications and performance test results of several filament high quality polyester nonwoven geotextile
Note: “>50” and “>10 000” are beyond the instrument range; 1, 2 and 3 are the self-made polypropylene filament needle-punched geotextiles; 4 and 5 are respectively polypropylene spunbond needles produced by a certain company in the market. Geotextile and polyester spunbond needled wholesale polyester nonwoven geotextile.
Comparing the data in Table 3, it can be seen that the needle density increases, the product weight, and thickness decrease, but the change is not big; the greater the needle density, the tighter the fiber entanglement, the greater the friction, the product tensile strength, tearing Breaking strength and breaking strength are greater. When the density of needle punching reaches 350 thorns/cm2, the tensile strength, tearing strength and bursting strength of the prepared polypropylene filament needle-punched high quality polyester nonwoven geotextile exceed 50% of the requirements of GB/T 17639-2008; when the density of needle punching When it is 600 thorns/cm2, the longitudinal tensile strength and tear strength of the prepared polypropylene filament needle-punched geotextile are equivalent to those of a polypropylene spunbond needle-punched polyester nonwoven geotextile factory price produced by a company, and the transverse tensile strength and tear strength are It is higher and has a bursting strength of 1.5 times. In addition, the greater the density of needling, the worse the vertical permeability of the prepared polypropylene filament needled polyester nonwoven geotextile manufacturers and the smaller the effective pore size, so that the water permeability is deteriorated. Compared with a company’s polypropylene spunbonded needle polyester nonwoven geotextile factory price, the effective pore size is equivalent, and the vertical permeability coefficient is about twice.
Insufficiently, the longitudinal tensile strength and tear strength of the polypropylene filament needle-punched polyester nonwoven geotextile manufacturers prepared in this study showed a large difference, and the transverse direction was larger than the longitudinal direction. This is because when the net is laid, the oscillating device swings to the left and right, and the mop curtain moves forward, and the speed at which the swaying device swings to the left and right is much larger than the speed at which the trawl curtain moves forward, resulting in the horizontal arrangement of the filaments in the web. In addition, the elongation at break of the three kinds of polypropylene filament needle-punched high quality polyester nonwoven geotextile prepared is less than that of a certain company’s polyester and polypropylene spunbonded needle-punched polyester nonwoven geotextile manufacturers, which may result in poor sample deformation ability and relatively easy to appear brittle during engineering application. Broken.
4 Conclusion
(1) Among the influencing factors of filament separation effect, the fineness of monofilament is the dominant factor, the smaller the fineness, the worse the effect of filament separation; the influence of voltage on the filament is more obvious, the higher the voltage, the better the separation; the wind pressure is divided Silk has a certain effect, but the effect is not obvious.
(2) The properties of polypropylene filament needle-punched polyester nonwoven geotextile manufacturers prepared by suitable preparation parameters can meet the requirements of national standards, and the wide tensile strength, tear strength and bursting strength exceed 50% of the standard requirements. It shows that the preparation method of polypropylene filament polyester nonwoven geotextile factory price proposed in this paper is feasible.
(3) Compared with the polyester and polypropylene spunbonded needled polyester nonwoven geotextile manufacturers produced by a domestic company, the prepared polypropylene filament needled geotextile has better comprehensive performance and better application potential. The shortcoming is that the vertical and horizontal fractures of the polyester nonwoven geotextile manufacturers, the tear strength difference is large, the elongation at break is small, and the resistance to deformation is poor. Further research is needed to improve the production process.