KR102089049B1 - Manufacturing method of electric conductive drawn fiber - Google Patents

Abstract

The present invention relates to a method for manufacturing a conductive stretched yarn, and the manufacturing method according to the present invention is a polyolefin elastomer (POE) in order to improve flexibility when a high content of conductive carbon black is included in a PE (polyethylene) or PP (polypropylene) resin. ) To solve the flexibility problem, and further, to include POE, it provides the optimal stretching treatment temperature range that can prevent single yarns. It has the effect.

Description

Manufacturing method of conductive stretched yarn {Manufacturing method of electric conductive drawn fiber}

The present invention relates to a method for manufacturing a conductive stretched yarn, specifically, weaving a hemp used to charge explosives when blasting with explosives at a construction site such as a tunnel construction or a mining construction, or similar similar hemps so that there is no static danger It relates to a method for manufacturing a conductive stretched yarn used when weaving.

Conductive tape yarns used in the manufacture of conventional polypropylene (PP) sacks are made by mixing conductive carbon black with polyethylene (PE) or polypropylene (PP) resin, or fibers made of polyethylene (PE) or polypropylene (PP) resin. Since it is manufactured by coating conductive carbon black on the surface, the fiber is stiff and lacks flexibility and elasticity, resulting in high occurrence of single yarns during stretching, and there is a limit to loss of conductivity when worn. Afterwards, the conductive materials were loosened to each other, and the conductivity was deteriorated. Therefore, the antistatic function could not be stably maintained, and there was a problem that it was difficult to use it as an explosive charge bag.

Registered Patent No. 10-1296404

An object of the present invention is to provide a method for manufacturing a conductive stretched yarn.

Another object of the present invention is to provide a conductive stretched yarn produced by the above manufacturing method.

Another object of the present invention is to provide a sack for charging explosive woven with the conductive stretched yarn.

In order to achieve the above object,

The present invention PE (polyethylene) or PP (polypropylene) resin; Polyolefin elastomer (POE); And mixing carbon black and melting to 270-280 ° C. to prepare a mother liquor (step 1);

Extruding the mother liquor in the molten state of step 1 to form a sheet-like molding, and passing it into a cooling water at 35-45 ° C. (step 2);

Passing the sheet-like moldings passing the cooling water of step 2 through a pressing roller to obtain a film flattened to a thickness of 0.2-0.4 mm (step 3);

Forming a film yarn having a width of 0.7-0.8 mm by passing a slitting mechanism in a state where the flattened film of step 3 is made taut by passing through a guide roller (step 4);

Forming a tape-like stretched yarn having a width of 2.8-3.2 mm by stretching the film yarn of Step 4 5-6 times at 108-122 ° C (Step 5); And

The tape-type stretched yarn of step 5 is continuously passed between two guide rollers and an ironing roller (10, 10a) of 120-135 ° C and a cooling roller (11, 11a) of 30-35 ° C at a constant speed. Stabilizing to prevent deformation and winding the product on a bobbin 12 (step 6); containing,

A method of manufacturing a conductive stretched yarn is provided.

In addition, the present invention provides a conductive stretched yarn produced by the above manufacturing method.

Furthermore, the present invention provides a sack for charging explosives woven with the conductive stretched yarn.

The manufacturing method according to the present invention has the effect of solving the flexibility problem by further including a polyolefin elastomer (POE) to improve the problem flexibility when a conductive carbon black is contained in a high content of PE (polyethylene) or PP (polypropylene) resin. There is,

Furthermore, when POE is additionally included, an optimal stretching treatment temperature range that can prevent single yarns is provided, and thus, mass production of conductive stretched yarns can be smoothly performed without interruption.

1 is a schematic view of a conductive stretched yarn manufacturing process line according to the present invention.
Figure 2 is a result of evaluating the weather resistance in the usable period when UV stabilizers are added to PE resins, PP resins, and POEs at concentrations of 0, 1000, 2000, and 4000 ppm, respectively.

Hereinafter, the present invention will be described in detail.

Manufacturing method

The present invention PE (polyethylene) or PP (polypropylene) resin; Polyolefin elastomer (POE); And mixing carbon black and melting to 270-280 ° C. to prepare a mother liquor (step 1);

Extruding the mother liquor in the molten state of step 1 to form a sheet-like molding, and passing it into a cooling water at 35-45 ° C. (step 2);

Passing the sheet-like moldings passing the cooling water of step 2 through a pressing roller to obtain a film flattened to a thickness of 0.2-0.4 mm (step 3);

Forming a film yarn having a width of 0.7-0.8 mm by passing a slitting mechanism in a state where the flattened film of step 3 is made taut by passing through a guide roller (step 4);

Forming a tape-like stretched yarn having a width of 2.8-3.2 mm by stretching the film yarn of Step 4 5-6 times at 108-122 ° C (Step 5); And

The tape-type stretched yarn of step 5 is continuously passed between two guide rollers and an ironing roller (10, 10a) of 120-135 ° C and a cooling roller (11, 11a) of 30-35 ° C at a constant speed. Stabilizing to prevent deformation and winding the product on a bobbin 12 (step 6); containing,

A method of manufacturing a conductive stretched yarn is provided.

In the manufacturing method according to the present invention, the step 1 is PE (polyethylene) or PP (polypropylene) resin; Polyolefin elastomer (POE); And mixing carbon black and melting to 270-280 ° C to prepare a mother liquor.

Preferably, the residual amount of the PE or PP resin; POE 3-17 wt%; And 25-30% by weight of carbon black, particularly preferably the amount of PE or PP resin; POE 5-15 wt%; And 27% by weight of carbon black.

If the POE content is less than 3% by weight, the effect of improving flexibility may be insignificant, and if it exceeds 17% by weight, there may be a problem that the properties of the stretched yarn are deteriorated. When the carbon black content is less than 25% by weight, conductivity may be deteriorated, and thus there may be a problem that the anti-static function cannot be secured, and when it exceeds 30% by weight, there may be a problem that the properties of the stretched yarn are deteriorated.

Additionally, a UV stabilizer may be additionally included for the purpose of improving weather resistance.

In the manufacturing method according to the present invention, the step 2 is a step of extruding the mother liquid in the molten state of step 1 to form a sheet-like molding, and passing it into a cooling water at 35-45 ° C.

The extrusion molding may use a conventional extrusion molding machine, in the present invention was used as a T die (2) as an embodiment.

In the manufacturing method according to the present invention, the step 3 is a step of obtaining a film flattened to a thickness of 0.2-0.4 mm by passing a sheet-shaped molding that has passed the cooling water of step 2 through a pressing roller.

In the manufacturing method according to the present invention, the step 4 passes the slitting mechanism (mechanism for cutting the film in the longitudinal direction) in a state in which the flattened film of step 3 is made taut by passing through the guide roller. This is a step of forming a film yarn (film-shaped yarn) of mm width.

In the manufacturing method according to the present invention, step 5 is a step of stretching the film yarn of step 4 at 108-122 ° C 5-6 times to form a tape-shaped stretched yarn having a width of 2.8-3.2 mm.

Preferably, the stretching treatment temperature may be performed at 110-120 ° C. For the stretching treatment, a stretching oven machine or the like can be used.

In the production of stretched yarn, elasticity is an important factor to prevent short yarns. Conventionally, the stretching treatment temperature of a stretched yarn using PE or PP resin as a raw material is performed in a range of 150-160 ° C.

In the present invention, in order to solve the problem of deterioration in flexibility when the content of conductive carbon black is increased in PE or PP resin, POE is additionally added for the purpose of improving flexibility, but is processed in the range of conventional stretching treatment temperature (150-160 ° C). When it was done, the elasticity was lowered, and a new problem in which single yarn was generated was identified, and an optimal stretching treatment temperature was derived to solve this (see Experimental Example 2).

In the manufacturing method according to the present invention, step 6 comprises two guide rollers of the tape-type stretched yarn of step 5, ironing rollers 10 and 10a at 120-135 ° C, and cooling rollers at 30-35 ° C (11, It is a step of stabilizing the stretched yarn by continuously passing between 11a) at a constant speed to prevent deformation and to wind the bobbin 12 to commercialize it.

Conductivity Stretcher

The present invention provides a conductive stretched yarn produced by the above manufacturing method.

The conductive stretched yarn according to the present invention is characterized by exhibiting permanent conductivity, and in particular, is characterized by having a surface resistance within 10 ⁵ ~ 10 ¹⁰ Ω / sq for preventing charging (electrostatic) in terms of conductivity. If it is out of the range of 10 ⁵ ~ 10 ¹⁰ Ω / sq, the anti-static (static) prevention function cannot be secured, and it cannot be used as a charging device for explosives.

Explosive charge  gunny sack

The present invention provides a sack for charging explosives woven with the conductive stretched yarn.

Hereinafter, the present invention will be described in more detail by the following examples. However, the following examples are merely to illustrate the present invention, the contents of the present invention is not limited by the following examples.

Sample properties

PP
(polypropylene) POE
(polyolefin elastomer) Carbon black MI (melt index)
(190 ℃, 2.16kg, g / min) 3-4 1.2 - density
(g / cm ³ ) 0.9 0.862 1.8

< Example  1-3 and Comparative example  1> conductivity A gentleman  Produce

PP (% by weight) POE (% by weight) Carbon black (% by weight) Comparative Example 1 75 - 25 Example 1 68 5 27 Example 2 63 10 27 Example 3 58 15 27

Step 1: PP, POE and carbon black were mixed in a kneader (1) with the composition shown in Table 1 above and melted at 270-280 ° C to prepare a mother liquor.

Step 2: The mother liquid in the molten state of step 1 is formed into a sheet-like molding by a T die (2) extrusion molding machine, and passed through a cooling water (3) at 35-45 ° C.,

Step 3: Pass the sheet-like molded product passing through the cooling water through the compaction roller 4 to obtain a film flattened to a thickness of 0.2-0.4 mm,

Step 4: Pass the slitting mechanism (6: longitudinal cutter) in a state where the flattened film is made taut by passing through the guide roller 5 to form a film yarn with a width of 0.7-0.8 mm,

Step 5: The slit film yarn 7 is put into an oven stretching machine 8 of 110-120 ° C., and stretched 5-6 times to form a tape-shaped stretched yarn 7a having a width of 2.8-3.2 mm,

Step 6: The tape-type stretched yarn is continuously fed between two guide rollers (9, 9a) and an ironing roller (10, 10a) at 120-135 ° C and a cooling roller (11, 11a) at 30-35 ° C at a constant speed. It was passed through to stabilize the stretched yarn to prevent deformation and rolled into a bobbin (12) to commercialize it.

< Experimental example  1> conductivity A gentleman  Evaluation of physical properties and conductivity

The properties and conductivity of the conductive stretched yarns prepared with the compositions of Examples 1-3 and Comparative Example 1 were evaluated and are shown in Table 3 below.

Draw ratio thickness
(Denier,
g / 9000m) conductivity
(Surface resistance, Ω / sq) cinnabar
Occur
Whether surface flexibility transform
Occur
Whether Comparative Example 1 4.5: 1 1500 10 ⁷ O coarseness Stiffness O Example 1 5: 1 1400 10 ⁷ ~ 10 ⁸ X Good tenderness X Example 2 5.1 ~ 5.5: 1 1300 10 ⁷ ~ 10 ⁸ X Good tenderness X Example 3 6: 1 1200 10 ⁸ X Good tenderness X

As shown in Table 3 above,

In terms of conductivity, it was confirmed that all samples were satisfied within 10 ⁵ ~ 10 ¹⁰ Ω / sq to prevent charging (static electricity).

In terms of surface roughness and flexibility, Comparative Example 1 was found to be unusable, while Example 1-3 was confirmed to be excellent.

Even in the aspect of whether the conductive stretched yarn having been completed is deformed, Comparative Example 1 was deformed, whereas in Examples 1-3, it was confirmed that none of the deformed.

< Experimental example  2> Drawing  Evaluation of elasticity according to temperature

In the production of stretched yarn, elasticity is an important factor to prevent short yarns. Conventionally, the stretching treatment temperature of a stretched yarn using PE or PP resin as a raw material is performed in a range of 150-160 ° C.

In the present invention, in order to solve the problem of deterioration in flexibility when the content of conductive carbon black is increased in PE or PP resin, POE is additionally added for the purpose of improving flexibility, but it can be processed in the general stretching treatment temperature (150-160 ° C) range. In the case of the elasticity is lowered to identify a new problem that a single yarn is generated, the optimal stretching treatment temperature was derived to solve this, and the results are shown in Table 4 below.

Specifically, the mother liquor prepared in the composition of Example 1-3 was introduced into the process line, and when the stretching treatment temperature was varied, the number of single yarn occurrences during one hour of operation was evaluated.

Sample Furtherance Stretch treatment temperature (℃) Number of single yarn occurrences during one hour of operation 1-1 Example 1 105 Episode 2 1-2 110 Episode 0 1-3 120 Episode 0 1-4 125 Episode 4 2-1 Example 2 105 Episode 2 2-2 110 Episode 0 2-3 120 Episode 0 2-4 125 3rd time 3-1 Example 3 105 1 time 3-2 110 Episode 0 3-3 120 Episode 0 3-4 125 3rd time

As shown in Table 4, it can be seen that despite the addition of POE, when the stretching treatment temperature is out of the range of 110-120 ° C, a single yarn occurs and a production process line is interrupted.

< Experimental example  3> Weatherability evaluation by adding UV stabilizer

When CHIMASORB 944FD (manufacturer: BASF) was added as a UV stabilizer to PE resin, PP resin, and POE at concentrations of 0, 1000, 2000, and 4000 ppm, weatherability was evaluated as a usable period, and the results are shown in FIG. 2. .

Figure 2 is a result of evaluating the weather resistance in the usable period when UV stabilizers are added to PE resins, PP resins, and POEs at concentrations of 0, 1000, 2000, and 4000 ppm, respectively.

As shown in FIG. 2, it was confirmed that when the UV stabilizer was added, the usable period was significantly improved.

1: kneader
2: T die
3: Cooling water
4: Crimping roller
5: Guide roller
6: slitting mechanism
7: Film company
8: Oven stretching machine
9, 9a: Guide roller
10, 10a: ironing roller
11, 11a: Cooling roller
12: Bobbin

Claims (8)

PE (polyethylene) or PP (polypropylene) resin balance; POE (polyolefin elastomer) 3-17% by weight; And preparing a mother liquor by mixing 25-30% by weight of carbon black and melting to 270-280 ° C (step 1);
Extruding the mother liquor in the molten state of step 1 to form a sheet-like molding, and passing it into a cooling water at 35-45 ° C. (step 2);
Passing a sheet-shaped molding that has passed the cooling water of step 2 through a compression roller to obtain a film flattened to a thickness of 0.2-0.4 mm (step 3);
Forming a film yarn having a width of 0.7-0.8 mm by passing a slitting mechanism in a state where the flattened film of step 3 is made taut by passing through a guide roller (step 4);
Stretching the film yarn of step 4 by 5-6 times at 108-122 ° C. to form a tape-shaped stretched yarn having a width of 2.8-3.2 mm (step 5); And
The tape-type stretched yarn of step 5 is continuously passed between two guide rollers and an ironing roller (10, 10a) of 120-135 ° C and a cooling roller (11, 11a) of 30-35 ° C at a constant speed. Stabilizing to prevent deformation and winding the product on a bobbin 12 (step 6); includes,
The stretching treatment of step 5 is a method of manufacturing a conductive stretched yarn, characterized in that the treatment in a stretching oven of 110-120 ℃.

delete delete According to claim 1,
PE or PP resin balance; POE 5-15 wt%; And 27% by weight of carbon black.
According to claim 1,
In step 1, the PE resin, PP resin, and POE, each of 1000 ~ 4000ppm UV stabilizer further characterized in that the manufacturing method.
Conductive stretched yarn produced by the method of claim 1.
The method of claim 6,
The conductive stretched yarn has a surface resistance within 10 ⁵ ~ 10 ¹⁰ Ω / sq to prevent charging (static electricity).
A sack for charging explosives that is woven from the conductive stretched yarn of claim 7.

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