CN114293275B - PP sweeping brush wire and preparation method thereof - Google Patents
PP sweeping brush wire and preparation method thereof Download PDFInfo
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- CN114293275B CN114293275B CN202210015843.3A CN202210015843A CN114293275B CN 114293275 B CN114293275 B CN 114293275B CN 202210015843 A CN202210015843 A CN 202210015843A CN 114293275 B CN114293275 B CN 114293275B
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Abstract
The invention is suitable for the technical field of daily necessities and provides a brush wire for a PP road sweeping brush and a preparation method thereof. The preparation method comprises the following steps: (1) Uniformly mixing 80-98% of PP particles, 0-5% of toner or color master and 2-15% of auxiliary agent, then melting, extruding, and then solidifying and freezing to obtain original silk; the original silk is an original silk with a hollow structure; (2) Carrying out first traction on the original filaments, then carrying out second traction after heating, then carrying out first shaping, and finally carrying out third traction and then carrying out second shaping to obtain the brush filaments for the PP sweeper brush; the PP road sweeping brush is characterized in that the brush filaments are hollow. The application also provides the brush wire for the PP sweeping brush obtained by the preparation method. The brush wire has a hollow structure, has better straight body degree and round body degree, can effectively improve the hardness and the heat dissipation efficiency of the brush wire, and has the advantages of less loss and long service life.
Description
Technical Field
The invention belongs to the technical field of daily necessities, and particularly relates to brush filaments for a PP (polypropylene) road sweeper and a preparation method of the brush filaments. The PP road sweeping brush has the advantages of high hardness of brush filaments, good wear resistance, straightening, higher section roundness and good aesthetic property.
Background
With the enhancement of environmental awareness of people, the requirements on urban and rural road environments are higher and higher. The road sweeping brush is a special brush for sweeping the road surface and is generally arranged below the sanitation vehicle. In general, a sweeping brush installed under a sanitation vehicle is a disk brush or a wire-type disk brush. In addition, the road-sweeping brush is divided into: square block road sweeping brushes, tabletting type roller combined brushes, roller type sweeper brushes, round branch road sweeping brushes, sewage treatment brushes and the like.
The brush filaments of the road brush are the main structure of the road brush and are the fastest consumed components. Therefore, it is important to select an appropriate brush wire for the road brush. If the brush wire with poor wear resistance is selected, not only the cleaning effect is influenced, but also the service life of the brush wire is shortened. Furthermore, the filaments are typically inserted into the brush by bending the filaments into a "U" shape or folding them and then inserting them into the holes in the handle, which requires that the filaments have a high resistance to breakage. The hardness, straightness and roundness of the brush filaments also affect the practical effect of the brush filaments.
PP, on the other hand, is one of the commonly used raw materials for road sweeper brushes and has good stress cracking resistance, abrasion resistance and chemical resistance. However, in the production process of the PP coarse yarn, the product shrinks due to large shrinkage rate of the PP after being molded and various external reasons, and the straightness and roundness of the brush yarn are further influenced. For example: in the traditional wire drawing process, the larger the pore diameter of a spinneret orifice of an extruder is, the more difficult the round body degree of the brush wire is to be controlled, and after the wire is extruded from the spinneret orifice, the temperatures of all the places on the cross section of the wire are different, so that the contraction of all the places on the cross section of the wire is inconsistent, and the round body degree of the finally formed wire is poor. Moreover, the temperature of the filament shaped by hot air is high, and the filament can shrink in the length direction after being completely cooled, so that the straight body of the finally-formed brush filament is poor, and the practical effect of the brush filament is influenced.
Disclosure of Invention
The embodiment of the invention provides a brush wire for a PP road sweeping brush and a preparation method thereof, and aims to solve the problems that the roundness of the PP brush wire is difficult to control, and the roundness and straightness of the PP brush wire are poor in the prior art.
On one hand, the invention provides a preparation method of brush filaments for a PP sweeping brush, which comprises the following steps:
(1) Raw material mixing and melt spinning: uniformly mixing 80-98% of PP particles, 0-5% of toner or color master and 2-15% of auxiliary agent, melting, extruding, and then solidifying and freezing to obtain original silk; the original silk is an original silk with a hollow structure; the percentages are weight percentages;
(2) Stretching and shaping: carrying out first traction on the original filaments, then carrying out second traction after heating, then carrying out first shaping, and finally carrying out third traction and then carrying out second shaping to obtain the brush filaments for the PP sweeper brush; the PP road sweeping brush is characterized in that the brush filaments are hollow.
In the step (1), the step (c),
the auxiliary agent is a toughening agent. The toughening effect is influenced by adding too little toughening agent; the bending strength of the brush wire can be influenced by excessive addition, so that the addition amount of the toughening agent is preferably 2-15%, the toughness of the brush wire can be well increased, the breaking resistance of the formed brush wire is improved, and the bending strength and the hardness of the brush wire are not influenced.
The melting and the extrusion are preferably carried out in an extruder, the temperature of which is preferably from 150 ℃ to 230 ℃.
The die for spinning by the extruder is a hollow spinning die; the size of the cavity of the hollow structure is adjusted by the size of the air flow introduced into the hollow spinning die.
The freezing is preferably carried out in a water chiller. The temperature of the water cooler is preferably set to 5-10 ℃.
In the step (2),
the speed of the first pull is less than the speed of the second pull, which is greater than the speed of the third pull. And because the PP molding shrinkage is large, the speed of the third traction is lower than that of the second traction. The original filament is stretched through the traction speed difference, and the speed difference between the original filament and the original filament can provide sufficient shrinkage space for PP molding, so that the molded PP brush filament has good straight body degree. The first traction speed is 2-10 m/min, the second traction speed is 16-100 m/min, and the third traction speed is 13-95 m/min.
The first drawing, the second drawing and the third drawing are preferably carried out in a stretcher.
The heating is preferably performed in a hot water tank, and the heating temperature is preferably set to 50 to 100 ℃.
The first setting is preferably carried out in a hot air blower, and the temperature of the first setting is preferably set to 170 to 230 ℃, preferably 180 to 200 ℃. The second sizing is preferably performed in a cold water tank; the temperature of the second setting is preferably set to 5 to 10 ℃.
The obtained brush filaments for the PP sweeping brush can be cut into different lengths according to different requirements, and the PP sweeping brush can be finished, rolled and packaged.
On the other hand, the invention also provides the brush filaments for the PP road sweeper brush, which are obtained by the preparation method.
In this application, the brush silk is through drawing the back for the first time, heats through air heater or hot-water tank, wherein, because of hot-water heat transfer is faster than hot-blast, under the same heat transfer efficiency, the temperature that the hot-water tank set up should be than the heat fan little, and the temperature that hot-blast design set up also should reduce thereupon. The traction speed of the third traction is lower than that of the second traction, the speed difference between the two speeds provides sufficient shrinkage space for PP molding, and the hollow brush filaments are subjected to hot air molding and then enter a cooling machine for rapid cooling, and are finally molded, so that the straightness of the brush filaments can be effectively improved; simultaneously, the brush silk adopts hollow structure, can effectively promote the hardness of brush silk, uses this brush silk to make and sweeps the brush of sweeping the way, can more effectively clean hard things such as cobblestone, grit. Moreover, the brush wires can generate heat in the working process, the heat dissipation efficiency of the brush wires can be effectively improved through the brush wires with the hollow structures, the loss of the brush wires is reduced, the wear resistance of the brush wires is effectively improved, and the service life of the brush wires in severe environments is greatly prolonged. The prepared brush wire is straight, has large roundness, better straight body degree and round body degree, and better aesthetic property.
Drawings
FIG. 1 is a schematic cross-sectional view of a PP brush wire for a sweeper brush prepared in example 1 of the present invention;
FIG. 2 is a schematic view showing a longitudinal surface structure of the brush filaments for the PP road brush of FIG. 1;
FIG. 3 is a schematic cross-sectional view showing the structure of a brush filament prepared in comparative example 1;
fig. 4 is a schematic view of the longitudinal surface structure of the brush filaments of fig. 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely 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.
It should be noted that, if directional indications (such as up, down, left, right, front, back, top, and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indication is changed accordingly.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The traditional PP coarse yarn process comprises the following steps: the raw materials are fully melted in an extruder, extruded through a circular spinneret orifice, cooled and formed through a cold water tank, and then dried through a hot air fan, extended through an extension machine, shaped through hot air and the like to finally prepare the PP coarse yarn. However, in the traditional wire drawing process, the larger the diameter of the spinneret orifice of the extruder is, the more difficult the roundness of the brush wire is to control, and after the wire is extruded from the spinneret orifice, the surface cooling speed is higher than that of the wire inside, the surface cooling shrinks inwards and extrudes, and uncooled molten fluid inside is transferred to the periphery, so that the roundness of the finally formed wire is poor. Moreover, the temperature of the filament shaped by hot air is high, and the filament shrinks in the length direction after being completely cooled, so that the straight degree of the finally-shaped filament is poor. In order to solve the technical problems, the invention provides a brush wire for a PP road sweeper and a preparation method thereof.
Specifically, on the one hand, the embodiment of the invention provides a preparation method of brush filaments for a PP road brush, which comprises the following steps:
(1) Uniformly mixing 80-98% of PP particles, 0-5% of toner or color master and 2-15% of auxiliary agent, melting, extruding, and then solidifying and freezing to obtain original silk; the original silk is an original silk with a hollow structure; the percentages are weight percentages;
(2) Carrying out first traction on the original filaments, then carrying out second traction after heating, then carrying out first shaping, and finally carrying out third traction and then carrying out second shaping to obtain the brush filaments for the PP sweeper brush; the PP road sweeping brush is characterized in that the brush filaments are hollow.
In the step (1), the step (c),
the auxiliary agent is a toughening agent. By adding the toughening agent and controlling the using amount of the controller to be 2% -15%, the toughness of the brush wire can be well increased, the breaking resistance of the formed brush wire is improved, and the bending strength and the hardness of the brush wire are not influenced. In the present application, the toughening agent is a terpolymer.
The melting and the extrusion are preferably carried out in an extruder, the temperature of which is preferably from 150 ℃ to 230 ℃.
The die for spinning by the extruder is a hollow spinning die; the size of the cavity of the hollow structure is adjusted by the size of the air flow introduced into the hollow spinning die. The hollow spinning die is adopted for spinning, so that the raw silk with a hollow structure can be formed by solidification and cooling after melt extrusion. And the size of the brush filament cavity can be adjusted by controlling the ventilation of the hollow spinning die and the size of the introduced airflow.
The hollow cavity of the hollow structure provides a certain contraction space for the brush filaments; when the brush wire with the hollow structure is extruded from the spinneret orifice, the cooling speed of the surface of the brush wire is higher than that of the brush wire inside, the surface of the brush wire is contracted and extruded inwards, and the cavity provides sufficient space for transferring uncooled molten fluid inside, so that the roundness of the brush wire is effectively improved.
The freezing and freezing are preferably carried out in a water chiller; the temperature of the water cooler is preferably set to 5-10 ℃.
In the step (2),
the speed of the first pull is less than the speed of the second pull, which is greater than the speed of the third pull. Because the PP molding shrinkage is large, the third traction speed is lower than the second traction speed, and the speed difference between the third traction speed and the second traction speed can provide sufficient shrinkage space for PP molding, so that the molded PP brush wire has good straightness. The first traction speed is 2-10 m/min, the second traction speed is 16-100 m/min, and the third traction speed is 13-95 m/min.
The first drawing, the second drawing and the third drawing are preferably carried out in a stretcher.
The heating is preferably performed in a hot water tank, and the heating temperature is preferably set to 50 ℃ to 100 ℃.
The first setting is preferably carried out in a hot air blower, and the temperature of the first setting is preferably set to 170 to 230 ℃, preferably 180 to 200 ℃.
The second sizing is preferably performed in a cold water tank; the temperature of the second setting is preferably set to 5 to 10 ℃. The cold water tank is used for preventing the PP brush wires from shrinking and deforming, and finally the brush wires are shaped.
The obtained brush filaments for the PP sweeping brush can be cut into different lengths according to different requirements, and the PP sweeping brush can be finished, rolled and packaged.
On the other hand, the embodiment of the invention also provides the brush wire for the PP sweeping brush, which is obtained by the preparation method.
Example 1
A preparation method of brush filaments for a PP sweeping brush comprises the following steps:
(1) Uniformly mixing 80 percent of PP particles, 5 percent of color master batch and 15 percent of toughening agent, melting, extruding, and then solidifying and freezing to obtain original filaments; the original silk is an original silk with a hollow structure; the percentages are weight percentages;
(2) Carrying out first traction on the original filaments, then carrying out second traction after heating, then carrying out first shaping, and finally carrying out second shaping after carrying out third traction to obtain the brush filaments for the PP sweeping brush; the PP road sweeping brush is characterized in that the brush filaments are hollow. The cross-sectional structure is shown in fig. 1, and the longitudinal surface structure is shown in fig. 2. As can be seen from FIG. 1, the PP road-sweeping brush has hollow brush filaments; as can be seen from FIG. 2, the PP road brush has straight brush filaments and better straightness.
In the step (1), the raw material is processed,
the melting and the extrusion were carried out in an extruder, the temperature of which was 150 ℃.
The die for spinning by the extruder is a hollow spinning die; the size of the cavity of the hollow structure is adjusted by the size of the air flow introduced into the hollow spinning die.
The freezing is carried out in a water chiller; the temperature of the water chiller was set at 10 ℃.
In the step (2), the step (3),
the speed of the first pull is less than the speed of the second pull, which is greater than the speed of the third pull. The first drawing, the second drawing and the third drawing are all carried out in a stretcher. The first traction speed is 8m/min, the second traction speed is 85m/min, and the third traction speed is 75m/min. The heating was performed in a hot water tank, and the temperature of the heating was set to 50 ℃.
The first setting is carried out in an air heater, and the temperature of the first setting is set to be 180 ℃.
The second setting is carried out in a cold water tank; the temperature of the second setting is set to be 5 ℃.
The obtained brush filaments for the PP sweeping brush can be cut into different lengths according to different requirements, and the PP sweeping brush can be finished, rolled and packaged.
Naturally hanging the brush wires for the PP road sweeping brush for 24 hours, extracting 35 cut brush wires, cutting the brush wires to be 60-80 mm long, measuring on a brush wire straight body degree test board, wherein the brush wire straight body degree which is matched with the scale of the test board is the brush wire straight body degree, and measuring the average value of the brush wire straight body degree to be 0.19; extracting 35 cut brush filaments, and testing the diameters of the large face and the small face of each brush filament by using the percentage thickness to obtain the average value of the diameter of the brush filaments of 2.146mm, wherein the roundness value reaches more than 80%; and (3) extracting 35 cut brush wires, and measuring by using a universal brush wire bending strength tester to obtain the average value of the bending strength of the brush wires of 1801.1mN. Specific test results are shown in table 1.
TABLE 1 test results of the PP brush filaments for road brush in example 1
| Detecting items | The result of the detection |
| Roundness value (%) | Over 80 percent |
| Silk diameter (mm) | 2.146 |
| Average value of straight body | 0.19 |
| Flexural Strength (mN) | 1801.1 |
( Note: the straight body test board, the unit of measurement is "curvature: 1/radius (1/meter) ". The straight body value of the brush wire is small, and the more straight the brush wire is. When the straight degree of the brush wire is 0, the brush wire is straight and has no bend. The same applies below. )
Example 2
A preparation method of brush filaments for a PP sweeping brush comprises the following steps:
(1) Uniformly mixing 98 percent of PP particles and 2 percent of toughening agent, melting, extruding, and then solidifying and freezing to obtain original filaments; the original silk is an original silk with a hollow structure; the percentages are weight percentages;
(2) Carrying out first traction on the original filaments, then carrying out second traction after heating, then carrying out first shaping, and finally carrying out third traction and then carrying out second shaping to obtain the brush filaments for the PP sweeper brush; the PP road sweeping brush is characterized in that the brush filaments are hollow.
In the step (1), the step (c),
the melting and the extrusion were carried out in an extruder, the temperature of which was 230 ℃.
The die for spinning by the extruder is a hollow spinning die; the size of the cavity of the hollow structure is adjusted by the size of the air flow introduced into the hollow spinning die.
The freezing is carried out in a water chiller; the temperature of the water chiller was set at 5 ℃.
In the step (2),
the speed of the first pull is less than the speed of the second pull, which is greater than the speed of the third pull. The first drawing, the second drawing and the third drawing are all carried out in a stretcher. The first drawing speed is 3m/min, the second drawing speed is 50m/min, and the third drawing speed is 40m/min.
The heating is carried out in a hot water tank, and the temperature of the heating is set to be 100 ℃.
The first sizing is carried out in a hot air blower, and the temperature of the first sizing is set to be 230 ℃.
The second setting is carried out in a cold water tank; the temperature of the second setting is set to 10 ℃.
The obtained brush filaments for the PP sweeping brush can be cut into different lengths according to different requirements, and the PP sweeping brush can be finished, rolled and packaged.
The obtained PP brush wire for the sweeping brush has the roundness value (%) of more than 83%, the wire diameter (mm) of 2.166, the average straight body degree of 0.21 and the bending strength (mN) of 1820.13.
Example 3
A preparation method of brush filaments for a PP sweeping brush comprises the following steps:
(1) Uniformly mixing 90 percent of PP particles, 3 percent of toner and 7 percent of toughening agent, melting, extruding, and then solidifying and freezing to obtain original silk; the original silk is an original silk with a hollow structure; the percentage is weight percentage;
(2) Carrying out first traction on the original filaments, then carrying out second traction after heating, then carrying out first shaping, and finally carrying out second shaping after carrying out third traction to obtain the brush filaments for the PP sweeping brush; the PP road sweeping brush is characterized in that the brush filaments are hollow.
In the step (1), the raw material is processed,
the melting and the extrusion were carried out in an extruder, the temperature of which was 200 ℃.
The die for spinning by the extruder is a hollow spinning die; the size of the cavity of the hollow structure is adjusted by the size of the air flow introduced into the hollow spinning die.
The freezing is carried out in a water chiller; the temperature of the water chiller was set at 8 ℃.
In the step (2),
the speed of the first pull is less than the speed of the second pull, which is greater than the speed of the third pull. The first drawing, the second drawing and the third drawing are all carried out in a stretcher. The first drawing speed is 10m/min, the second drawing speed is 100m/min, and the third drawing speed is 91m/min.
The heating was performed in a hot water tank, and the temperature of the heating was set to 70 ℃.
The first setting is carried out in an air heater, and the temperature of the first setting is set to be 200 ℃.
The second sizing is carried out in a cold water tank; the temperature of the second setting is set to be 8 ℃.
The obtained brush filaments for the PP sweeping brush can be cut into different lengths according to different requirements, and the PP sweeping brush can be finished, rolled and packaged.
The obtained PP road brush wire has roundness value (%) of above 85%, wire diameter (mm) of 2.168, straight average value of 0.23, and bending strength (mN) of 1815.26.
Comparative example 1
Comparative example 1 compared to example 1, the difference in material was that no toughening agent was added; the difference in the process is that a circular spinning die is adopted, a hot air blower is used for heating and shaping the brush wires, and the final shaping is not carried out by traction and cooling for the third time.
The specific operation is as follows:
(1) Uniformly mixing 95 percent PP particles and 5 percent color master batch, melting, extruding, and then solidifying and freezing to obtain original filaments; the percentage is weight percentage;
(2) And drawing the original filament for the first time, then heating, drawing for the second time, and then shaping to obtain the PP brush filament. The cross-sectional structure is shown in fig. 3, and the longitudinal surface structure is shown in fig. 4. As can be seen from FIG. 3, the PP brush filaments are solid brush filaments; as can be seen from figure 4, the brush wire has certain bending inclination, is not straight enough and has poor straight body.
In the step (1), the step (c),
the melting and the extrusion were carried out in an extruder, the temperature of which was 150 ℃.
The spinning die of the extruder is a circular spinning die.
The freezing is carried out in a water chiller; the temperature of the water chiller was set at 10 ℃.
In the step (2),
the speed of the first pull is less than the speed of the second pull. The first drawing and the second drawing are both performed in a stretcher. The first drawing speed was 8m/min and the second drawing speed was 85m/min.
The heating was carried out in a hot air blower, the temperature of the heating being set at 180 ℃.
The shaping is carried out in a hot air blower, and the temperature of the shaping is set to be 190 ℃.
The obtained PP brush wire has roundness value (%) of 63, wire diameter (mm) of 2.195, straight body average value of 1.5 or more, and bending strength (mN) of 820.8.
Comparative example 2
Comparative example 2 compared to example 1, the difference in material was that no toughening agent was added; the difference in the process is that a circular spinning die is adopted, a hot air blower is used for shaping the brush wires, and the final shaping is not carried out by traction and cooling for the third time.
The specific operation is as follows:
(1) Uniformly mixing 95 percent PP particles and 5 percent color master batch, melting, extruding, and then solidifying and freezing to obtain original filaments; the percentages are weight percentages;
(2) And drawing the original filament for the first time, then heating, drawing for the second time, and then shaping to obtain the PP brush filament.
In the step (1), the step (c),
the melting and the extrusion were carried out in an extruder, the temperature of which was 150 ℃.
The spinning die of the extruder is a circular spinning die.
The freezing is carried out in a water chiller; the temperature of the water chiller was set at 10 ℃.
In the step (2), the step (3),
the speed of the first pull is less than the speed of the second pull. The first drawing and the second drawing are both performed in a stretcher. The first drawing speed is 8m/min, and the second drawing speed is 85m/min.
The heating was performed in a hot water tank, and the temperature of the heating was set to 50 ℃.
The shaping is carried out in a hot air blower, and the temperature of the shaping is set to be 180 ℃.
The obtained PP brush wire has the roundness value (%) of 71, the wire diameter (mm) of 2.125, the straight body average value of more than 1.5 and the bending strength (mN) of 1157.2.
Comparative example 3
Comparative example 3 compared with example 1, the difference is mainly represented by using a hot air blower to shape the brush filaments, and not carrying out the third traction and cooling for final shaping. The remaining production process was the same as in production example 1.
The obtained PP brush wire has the roundness value (%) of 75, the wire diameter (mm) of 2.105, the straight body average value of more than 1.5 and the bending strength (mN) of 1345.7.
The specific operation is as follows:
(1) Uniformly mixing 80 percent of PP particles, 5 percent of color master batch and 15 percent of toughening agent, melting, extruding, and then solidifying and freezing to obtain original filaments; the original silk is an original silk with a hollow structure; the percentage is weight percentage;
(2) And drawing the original filament for the first time, then heating, drawing for the second time, and then shaping to obtain the PP brush filament.
In the step (1), the step (c),
the melting and the extrusion were carried out in an extruder, the temperature of which was 150 ℃.
The die for spinning by the extruder is a hollow spinning die; the size of the cavity of the hollow structure is adjusted by the size of the air flow introduced into the hollow spinning die.
The freezing is carried out in a water chiller; the temperature of the water chiller was set at 10 ℃.
In the step (2),
the speed of the first pull is less than the speed of the second pull. The first drawing and the second drawing are both carried out in an elongator. The first drawing speed was 8m/min and the second drawing speed was 85m/min.
The heating was performed in a hot water tank, and the temperature of the heating was set to 50 ℃.
The shaping is carried out in a hot air blower, and the temperature of the shaping is set to be 180 ℃.
The obtained PP brush wire has the roundness value (%) of 71, the wire diameter (mm) of 2.125, the straight body average value of more than 1.0 and the bending strength (mN) of 1157.2.
Comparative example 4 compared to example 1, the difference is mainly represented by the final setting of the brush filaments using a hot air blower.
(1) Uniformly mixing 80 percent of PP particles, 5 percent of color master batch and 15 percent of toughening agent, melting, extruding, and then solidifying and freezing to obtain original filaments; the original silk is an original silk with a hollow structure; the percentages are weight percentages;
(2) Carrying out primary traction on the original filaments, then carrying out secondary traction after heating, and carrying out hot air shaping after carrying out tertiary traction after heating to obtain PP brush filaments; the PP brush filaments are hollow brush filaments.
In the step (1), the step (c),
the melting and the extrusion were carried out in an extruder, the temperature of which was 150 ℃.
The die for spinning by the extruder is a hollow spinning die; the size of the cavity of the hollow structure is adjusted by the size of the air flow introduced into the hollow spinning die.
The freezing is carried out in a water chiller; the temperature of the water chiller was set at 10 ℃.
In the step (2),
the speed of the first pull is less than the speed of the second pull, which is greater than the speed of the third pull. The first drawing, the second drawing and the third drawing are all carried out in a stretcher. The first traction speed is 8m/min, the second traction speed is 85m/min, and the third traction speed is 75m/min. The heating was carried out in a hot air blower, the temperature of the heating being set at 180 ℃.
The shaping is carried out in a hot air blower, and the temperature of the shaping is set to be 190 ℃.
The second sizing is carried out in a cold water tank; the temperature of the second shaping is set to be 5 DEG C
The obtained PP brush wire has a roundness value (%) of 78, a wire diameter (mm) of 2.108, a straight body average value of 1.0 or more, and a bending strength (mN) of 1511.8.
Therefore, in the application, after the brush wire is drawn for the first time, the brush wire is heated by the hot air blower or the hot water tank, wherein the hot water is faster in heat transfer than hot air, and under the same heat transfer efficiency, the temperature set by the hot water tank is smaller than that of the hot air blower, and the temperature set by the hot air shaping is reduced accordingly. The hollow brush filaments are shaped by hot air and then enter a cooling machine for rapid cooling, and are finally shaped, so that the straightness of the brush filaments can be effectively improved; simultaneously, the brush silk adopts hollow structure, can effectively promote the hardness of brush silk, uses this brush silk to make and sweeps the brush of sweeping the way, can more effectively clean hard things such as cobblestone, grit. Moreover, the brush wires can generate heat in the working process, the heat dissipation efficiency of the brush wires can be effectively improved through the brush wires with the hollow structures, the loss of the brush wires is reduced, the wear resistance of the brush wires is effectively improved, and the service life of the brush wires in severe environments is greatly prolonged. The prepared brush wire is straight, has large roundness, better straight body degree and round body degree and better aesthetic property.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A preparation method of brush filaments for a PP sweeping brush is characterized by comprising the following steps:
(1) Uniformly mixing 80-98% of PP particles, 0-5% of toner or color master and 2-15% of toughening agent, then melting, extruding, and then solidifying and freezing to obtain original silk; the original silk is an original silk with a hollow structure; the percentages are weight percentages;
(2) Carrying out first traction on the original filaments, then carrying out second traction after heating, then carrying out first shaping, and finally carrying out third traction and then carrying out second shaping to obtain the brush filaments for the PP sweeper brush; the PP road sweeping brush is characterized in that the brush filaments for the road sweeping brush are hollow;
in the step (2), the speed of the first traction is lower than that of the second traction, and the speed of the second traction is higher than that of the third traction; the first drawing, the second drawing and the third drawing are all carried out in a stretcher;
the first traction speed is 2-10 m/min, the second traction speed is 16-100 m/min, and the third traction speed is 13-95 m/min.
2. The method for preparing the brush filaments for the PP road brush according to claim 1, wherein in the step (1), the toughening agent is a terpolymer.
3. The method for preparing brush filaments for PP road brush according to claim 1, wherein the melting and the extruding are performed in an extruder having a temperature of 150 to 230 ℃ in the step (1).
4. The method for preparing the brush filaments for the PP sweeper brush according to claim 3, wherein the die for spinning by the extruder is a hollow spinning die; the size of the cavity of the hollow structure is adjusted by the size of the air flow introduced into the hollow spinning die.
5. The method for preparing brush filaments for PP road brush according to claim 1, wherein in the step (1), the freezing is performed in a water chiller; the temperature of the water cooler is set to be 5-10 ℃.
6. The method for preparing brush filaments for PP road brush according to claim 1, wherein in the step (2), the heating is performed in a hot water tank, and the temperature of the heating is set to 50-100 ℃; the first setting is carried out in an air heater, and the temperature of the first setting is set to be 170-230 ℃.
7. The method for preparing brush filaments for a PP road brush according to claim 1, wherein in the step (2), the second sizing is performed in a cold water tank; the temperature of the second shaping is set to be 5-10 ℃.
8. A brush filament for PP road brush, which is prepared by the preparation method of any one of claims 1 to 7.
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