JP2001253954A - Tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape which can improve the efficiency of work due to its proper self back surface adhesive force without causing the natural development of the rolled product of the tape, can beautifully bind an article to be bound due to a proper slipping property after being developed, and does not cause the pollution of environments. SOLUTION: This tape comprising a polyolefin-based resin, characterized by having the following physical properties. (1) The tensile elastic modulus of the tape in the MD direction is 15 to 150 MPa. (2) The tape has a stress of 5 to 30 MPa when extended in the MD direction, and does not have a yield point. (3) The tape has a residual stress of 2 to 16 MPa at one minute after extended in the MD direction. (4) The tape has a self back surface adhesive force of 1 N/50 mm to <30 N/50 mm in a state of a rolled product, and a coefficient of dynamic friction of <=1.0 after developed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape for binding or protecting electric wires, pipes, tubes, and the like, and more particularly to a tape suitably used for binding or protecting piping and the like of an air conditioner.

[0002]

2. Description of the Related Art For the purpose of binding or protecting electric wires, pipes, tubes, and the like, a non-adhesive tape is spirally wound.
It is widely practiced to fix both ends to the object to be bound with an adhesive tape. The non-adhesive tape is used because it is less expensive than the adhesive tape. For example, pipes connecting an indoor unit and an outdoor unit of an air conditioner include (1) a copper tube coated with an insulating foam for sending fluid from the indoor unit to the outdoor unit, and (2) an insulating foam for returning fluid from the outdoor unit to the indoor unit. Copper tubes coated with body, (3)
Non-adhesive made of soft polyvinyl chloride to bind and protect the aggregate consisting of four parts: an insulated wire that supplies power to drive the outdoor unit, and (4) a tube that drains condensed water from the indoor unit It is widely practiced to spirally wind an adhesive tape and fix both ends of the non-adhesive tape with an adhesive tape. At this time, it is common to pull the non-adhesive tape in order to finish the binding neatly, and then fix the winding end to the binding body. Therefore, the non-adhesive tape is required to have good slipperiness between the inner surface and the back surface.

[0003] The non-adhesive tape made of the flexible polyvinyl chloride has a high flexibility and is easily stretched, so that it follows the irregularities of the above-mentioned binding body well, and since it has no yield point when stretched, the colored tape becomes white. The appearance is not impaired. Also, the object to be tied can be tightly bound by an appropriate stress at the time of elongation. Further, the heat insulating foam covering the copper tube is not crushed by the stress relaxation, and the binding is not loosened by the moderate residual stress. Furthermore, since it can be cut by hand by pulling strongly, workability is good and it is suitable for the above-mentioned applications.

[0004] The above non-adhesive tape made of soft polyvinyl chloride has no adhesive force with its back surface in a wound state,
Can be deployed without adding force. Therefore, if the tape is accidentally dropped while holding the end of the tape, such as during construction at a high place, there is a disadvantage in that the winding body unwinds and falls to the ground, and reworking rewinds the work efficiency significantly. Was.
In addition, soft polyvinyl chloride is not environmentally desirable because it emits harmful substances when incinerated after use. Therefore, a tape which is made of a material other than flexible polyvinyl chloride and which is suitable for the above-mentioned applications is demanded.

[0005] A tape-like material which is flexible and easy to stretch without generating harmful substances by incineration, has an appropriate stress and strength at the time of stretching, has a self-back surface adhesive force when rolled, and has a good slipperiness after deployment. Examples include a commercial wrap film made of a polyolefin resin. In automatic packaging using commercial wrap film, rolls are rolled out, a film is placed on a tray such as Styrofoam, stretch-wrapped so as to wrap the tray, and then fixed by heat bonding with a hot plate on the bottom of the tray .

[0006] If the sliding property is poor at the time of stretch packaging, wrinkles are generated, and the commercial value of the packaged object is reduced. Stretch films have been proposed. For example, Japanese Patent Application Laid-Open No. 10-34835 discloses that a resin composition comprising a styrene-vinyl isoprene-styrene block copolymer, a polyolefin-based resin, and a tackifying resin is used as a main component, and has an appropriate slip property, self-adhesiveness,
A laminated film for stretch packaging having antifogging properties is disclosed. However, the films described in the above publications are too soft and lack stress and strength upon elongation. Furthermore, since the concealing property, the weather resistance, and the hand-cutting property are inferior, it cannot be applied to binding and protection of electric wires, pipes, tubes, and the like.

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention can improve the work efficiency without a natural expansion of a wound body by an appropriate self-back surface adhesive force, and can be bound by an appropriate slipperiness after the expansion. An object of the present invention is to provide a tape which can bind objects neatly and does not cause environmental pollution.

[0008]

Means for Solving the Problems The tape of the present invention is made of a polyolefin resin and has the following physical properties. (1) The tensile modulus in the MD direction is 15 to 150 MPa. (2) Stress at the time of 50% elongation in the MD direction is 5 to 30M
Pa and has no yield point. (3) Residual stress after 1 minute after elongation by 50% in the MD direction is 2
１６16 MPa. (4) The self-back surface adhesive strength in a wound state is 1N / 50.
mm or more and less than 30 N / 50 mm, and the dynamic friction coefficient after development is 1.0 or less.

M of tape made of polyolefin resin
If the tensile modulus in the D direction is too small, the material is too soft and the strength is reduced, and the aggregate of the objects to be tied is loosened or rattled. Conversely, if it is too large, the tape becomes hard and lacks flexibility, and the ability to follow the unevenness of the aggregate is reduced. Therefore, the tensile modulus is 15 to 150 MPa, and preferably 8 to 1 MPa.
5 MPa.

If the polyolefin resin tape has a yield point when it is stretched in the MD direction, the colored tape becomes white and its appearance deteriorates above the yield point. Necessary stress cannot be given at the time of winding, and the binding force is reduced and the appearance is deteriorated. Therefore, it is necessary to have no yield point and increase the stress as it elongates.

If the stress when elongated in the MD direction is too small, it is not possible to apply the necessary stress in spirally winding, and the binding force is insufficient and the appearance is deteriorated. or,
If the stress is too large, the heat insulating foam covering the copper tube is crushed, and the heat insulating effect is reduced. Therefore, the stress at the time of elongation by 50% in the MD direction needs to be 5 to 30 MPa, and preferably 8 to 15 MPa.

If the stress is relieved immediately after binding the objects to be bound and the residual stress becomes too small before both ends are fixed with the adhesive tape, the binding becomes loose or loose. If the stress is not relaxed and the residual stress is too large, the heat insulating foam which covers the copper tube is crushed to lower the heat insulating effect, or the tape is turned up at both ends in the width direction to impair the appearance. It is necessary that the residual stress after 1 minute of elongation by 50% is 2 to 16 MPa.

The measured value of the tensile modulus is JIS K71.
According to No. 27, a tape having a width of 10 mm was gripped in the MD direction at a distance between grippers of 40 mm, and a tensile test was performed at 23 ° C. at a speed of 300 mm / min. The stress when the tape is stretched by 50% in the MD direction is the stress when the tape is stretched by 1.5 times in the above measurement, and is the stress after stopping the stretching and holding the tape for 1 minute. . In the present invention, 50% elongation in the MD direction is defined as MD direction.
It means extending 1.5 times in the direction.

The self-back surface adhesive force of the wound tape is 1
It is necessary to be not less than N / 50 mm and less than 30 N / 50 mm. If it is less than 1 N / 50 mm, if the wound body is dropped while holding the end of the tape, all the tape is unfolded and workability is significantly deteriorated. Also, 30N / 50m
If it is more than m, the deploying force from the wound body is too large, and the workability deteriorates.

The coefficient of kinetic friction of the tape developed from the wound body must be 1.0 or less. Dynamic friction coefficient is 1.
If it exceeds 0, even if it is pulled after being wound around the object to be tied, the slidability is insufficient and it is not possible to tie it neatly.

The self-back surface adhesive strength of the wound body is JIS Z
This is the deployment force measured at a rewind speed of 30 m / min according to 0237. The kinetic coefficient of friction of the expanded tape is JIS
In accordance with K7125, measurement was performed using a 200 g sliding piece as a weight, and calculated by the following equation. Dynamic friction coefficient = (dynamic friction force between tapes) / (weight of sliding piece)

As the polyolefin resin used in the present invention, any resin having the above-mentioned physical properties can be used. Particularly preferred are those having a weight average molecular weight of 80,000 to 600,000, more preferably 170,000 to 4
40,000 polypropylene resins. Further, the polypropylene resin has a resin elution amount measured by the cross fractionation method of 40 to 40 ° C. with respect to the total polypropylene resin amount.
70% by weight, 10 to 30% by weight above 0 ° C and 70 ° C or less, 7
It is preferably 20 to 40% by weight above 0 ° C.

The weight average molecular weight of the polypropylene resin is, for example, a high temperature GPC (150C) manufactured by WATERS.
V). If the weight average molecular weight of the polypropylene resin is less than 80,000, the strength of the tape is insufficient, and
If it exceeds 10,000, sufficient flexibility cannot be obtained.

In the present invention, the elution amount of the resin by the cross fractionation method was measured as follows. A polypropylene resin is dissolved in o-dicyclobenzene at 140 ° C. or a temperature at which the resin is completely dissolved, cooled at a constant rate, and a thin polymer layer is formed on a surface of an inert carrier prepared in advance in order of high crystallinity and molecular weight. Are generated in descending order. Next, the temperature of the formed polymer layer is increased continuously or stepwise, the concentration of the eluted component is sequentially detected, and the temperature distribution of the eluted component is measured. The molecular weight and molecular weight distribution are measured by high-temperature GPC. In the present invention, the measurement was carried out using a cross-separation chromatograph (CFC-T150A; manufactured by Mitsubishi Chemical Corporation) having the above-mentioned temperature-rise elution fractionation part and high-temperature GPC part as a system.

The polypropylene resin used in the present invention has a preferable resin elution amount by the above-mentioned cross fractionation method of 0.
At 40C, the amount is 40 to 70% by weight of the total amount of the polypropylene resin, and more preferably 45 to 70% by weight. If the resin elution amount at 0 ° C. is less than 40% by weight, the tensile elasticity of the tape becomes too large, and the ability to follow the material to be bound is insufficient, and
If it exceeds 0% by weight, the strength of the tape is reduced and the binding power is insufficient.

The amount of resin eluted at temperatures exceeding 0 ° C. and 70 ° C. or less is 1
The content is preferably 0 to 30% by weight, more preferably 15 to 2% by weight.
5% by weight. If the elution amount is less than 10% by weight, 50
% Elongation of the tape becomes too large, and if it exceeds 30% by weight, the stress at 50% elongation of the tape becomes insufficient. Furthermore,
The resin elution amount above 70 ° C. is preferably 20 to 40% by weight, more preferably 25 to 40% by weight. If the elution amount is less than 20% by weight, the strength of the tape is insufficient, and if it exceeds 40% by weight, the tensile elasticity becomes too large and the followability to the binding object is insufficient.

The above-mentioned polypropylene resin is obtained by polymerizing ethylene and propylene monomers in the presence of polypropylene, that is, obtained by a reactor blending method, for example, as described in JP-A-3-205439. Are preferred. Such products are commercially available from several companies such as "Cataroy" (trade name, manufactured by Montell Corporation) and "PER" (trade name, manufactured by Tokuyama Corporation).

The polypropylene-based resin or the polypropylene-based resin may be a low-density polyethylene, a linear low-density polyethylene, a high-density polyethylene, an ethylene-vinyl acetate copolymer, ethylene and α- Other polyolefin-based resins such as copolymers with olefins and polybutene may be blended.

Further, the polyolefin resin used in the present invention includes additives usually used for the polyolefin resin, such as an antioxidant, an ultraviolet absorber, a light stabilizer, a slip agent and an antiblocking agent, and calcium carbonate. , Talc, mica and the like may be added.

The method for producing the tape of the present invention comprises a T-die method,
A conventionally known molding method such as an air-cooled or water-cooled inflation method and a calendar method can be employed. For the purpose of improving molding efficiency and molding workability, another polyolefin-based resin may be laminated on one or both sides of the tape as long as the effects of the present invention are not impaired. Further, printing may be performed on one side or both sides after molding.

Although the tape of the present invention can obtain a sufficient effect even if it is not stretched, in order to enhance the effect, a stretching ratio of 1.times.
It is preferable that the film is stretched 1 to 1.5 times. Stretching in the MD direction increases stress at the time of elongation, and stretching in the TD direction has an effect of enhancing hand-cutting properties. If the stretching temperature is lower than 60 ° C., the tape is too high in stress and cannot be sufficiently stretched. If the temperature exceeds 150 ° C., stress relaxation after elongation becomes insufficient when stretching in the MD direction, and hand-cutting properties deteriorate when stretching in the TD direction. The preferred stretching temperature is 75 to 12
0 ° C.

If the stretching ratio is less than 1.1, the effect of stretching is not sufficiently exhibited, and if it exceeds 5 times, the tape becomes too hard and lacks flexibility. More preferred stretching ratio is 1.5
~ 2.5 times. The stretching method may be any method as long as the tape can be uniformly stretched in at least one direction, such as tenter stretching, longitudinal uniaxial stretching, simultaneous biaxial stretching, sequential biaxial stretching, roll rolling stretching, tubular stretching, and the like. It is preferably used. Further, an annealing treatment may be performed as needed.

The thickness of the tape may be appropriately determined depending on the application, but is generally from 20 to 300 μm, preferably from 100 to 170 μm. The width of the tape may be appropriately determined depending on the application, but is generally 10 to 200 mm, preferably 30 to 70 mm. In addition, one or both sides of the tape may be embossed to improve the appearance or adjust the slipperiness.

(Action) (1) Since the tensile elasticity in the MD direction is 15 to 150 MPa, it has an appropriate flexibility and strength, so that it has good followability to a bound aggregate and does not loosen. . (2) Stress at the time of 50% elongation in the MD direction is 5 to 30M
Since it is Pa and has no yield point, the stress increases as it elongates, and the necessary stress is obtained when spirally wound. Further, the heat insulating foam covering the copper tube or the like is not crushed, and the heat insulating effect is not reduced. (3) Residual stress after 1 minute after elongation by 50% in the MD direction is 2
Since it is 16 MPa, the bound aggregate does not loosen, and the heat insulating effect does not decrease. (4) The self-back surface adhesive strength in a wound state is 1N / 50.
mm or more and less than 30 N / 50 mm, and the coefficient of dynamic friction after development is 1.0 or less, so that the tape can be naturally developed by its own weight even if it is dropped while holding the end of the wound tape by hand. And workability is not impaired. Moreover,
The workability is good because it has an appropriate deployability. In addition, since it has an appropriate sliding property, the objects to be tied can be tied firmly and with good appearance. (5) The polyolefin resin has a weight average molecular weight of 8
When a tape having a size of 10,000 to 600,000 is used, appropriate strength and flexibility of the tape are secured. In addition, by setting the amount of the resin eluted by the cross separation method of the polyolefin resin as described above, the followability of the tape to the object to be bound, the binding force and the strength can be obtained more reliably. (6) Those stretched 1.1 to 5 times in at least one direction increase the binding force on the binding object while maintaining flexibility in the MD direction, and those stretched in the TD direction improve hand-cutting properties. I do.

[0030]

(Example 1) Polypropylene resin: weight-average molecular weight: 440,000, resin elution amount measured by a cross fractionation method is 55% by weight at 0 ° C, 18% by weight at a temperature exceeding 0 ° C and 70 ° C or less, Over 70 ° C, 27% by weight (manufactured by Montell, trade name “Cataroy KS-353P”) 100 parts by weight High-density polyethylene: MFR = 2.0 g / 10 min, density 0.94 g / cm ³ 10 parts by weight Titanium oxide: 1 part by weight The resin composition is extruded with a T-die and has a thickness of 120 μm.
Then, the film was roll-drawn at a draw ratio of 2.0 using a heating furnace having a furnace length of 5 m and a furnace temperature of 110 ° C. to obtain a drawn polyolefin-based resin film. Corona discharge treatment was performed on both surfaces of the film at a discharge rate of 50 W / m ² / min to enhance the adhesion between the films. 20 m of this film was wound around a paper tube having an outer diameter of 37 mm, and cut into a width of 50 mm to obtain a tape of the present invention. The MFR of high-density polyethylene is J
Based on IS K 7210, temperature 190 ° C, load 22
Measured in N.

Example 2 20 m of the stretched film before corona discharge treatment obtained in Example 1 was wound around a paper tube having an outer diameter of 37 mm in the same manner as in Example 1, and cut into a width of 50 mm. For the purpose of deaeration between films of this film roll, 4
The aging treatment was performed at 0 ° C. for 48 hours.

(Comparative Example 1) 100 parts by weight of a polyvinyl chloride resin having a degree of polymerization of 1000 and 48 parts by weight of dioctyl phthalate were calendered to obtain a soft polyvinyl chloride film having a thickness of 120 µm. This was wound around a paper tube in the same manner as in Example 1 and cut into a width of 50 mm.

(Comparative Example 2) Linear low-density polyethylene (trade name "Ultzex 2020" manufactured by Mitsui Chemicals, Inc.)
L ", MFR = 1.8 g / 10 min, density 0.920 g /
cm ³ ) was extruded with a T-die to obtain a polyolefin resin film having a thickness of 120 μm. This film was wound around a paper tube in the same manner as in Example 1, and cut into a width of 50 mm.

Measurement of Dynamic Friction Coefficient The tapes obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were JIS K
According to 7127, tensile modulus in MD direction, MD
The stress when elongating 50% in the machine direction, the residual stress 1 minute after elongating 50% in the MD direction, and the presence or absence of a yield point were measured.
The self-back surface adhesive force was measured according to JIS Z0237, and the dynamic friction coefficient was measured according to JIS K7125.

Preparation of the binding body Each of the tapes is fixed to an object to be bound (length: 5 m) described in (1) to (4) below with an adhesive tape at the start end of the tape, and the bandage is spirally wound. The wire was wound and bound while being pulled, and the end of winding was fixed with an adhesive tape to obtain a bound body. (1) an outer diameter of 28 mm through which a 9 mm outer diameter copper tube is passed;
8mm thick foamed polyethylene tube. (2) an outer diameter of 28 mm, in which a 6 mm outer diameter copper tube is passed;
8mm thick foamed polyethylene tube. (3) A flat cable having a long diameter of 14 mm and a short diameter of 6 mm, in which three cores of a copper wire having a diameter of 2 mm are covered with a soft resin. (4) A plastic drain hose having an outer diameter of 20 mm and a thickness of 1 mm.

Evaluation of binding performance The above-mentioned binding bodies were evaluated for appearance and binding performance according to the following criteria. (A) Appearance (following irregularities, occurrence of wrinkles) ×: Due to insufficient flexibility and elongation of the tape, wrinkles with a length of 5 mm or more were generated in the TD direction of the tape at the bent portion of the pipe. , Markedly impaired appearance: wrinkles with a length of less than 5 mm were generated 5 times or less during a winding length of 4 m, but there was no practical problem. ◎: wrinkles were not generated at all. (B) Generation of whitening ×: The tape yielded by pulling, and the appearance was impaired by whitening. ；: No tape yielding and whitening did not occur due to tension. (C) Concealment by elongation ×: As a result of elongation of the tape due to tension and reduction in thickness,
The pipe that is the object to be bound can be seen through. ；: The pipe to be bound is not visible at all. (D) Bundling property X: The tape was cut when the material to be bound in the portion where the tape was not wound was shaken by hand. ；: The tape was not cut, but was partially loosened. However, there is no problem in practical use. A: No rattling or loosening occurred. Table 1 shows the above results.

[0037]

[Table 1]

[0038]

Since the tape of the present invention is as described above, one end of the tape is fixed to the object to be tied, and when the tape is tied while being pulled, the tape is stretched and the object to be tied is tied in a high stress state with good appearance. The binding object does not loosen or rattle after the binding. When the polyolefin resin has a weight average molecular weight of 80,000 to 600,000, the tape can have sufficient strength and flexibility. Further, by setting the resin elution amount measured by the cross fractionation method as described above, it is possible to more reliably have the physical properties of the polyolefin resin required in the present invention. Since the tape of the present invention uses a polyolefin-based resin, it does not cause environmental pollution due to harmful gases even when incinerated, and can be suitably used for binding air-conditioning pipes and the like coated with heat insulation instead of polyvinyl chloride tape.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) C08L 23:00 C08L 23:00

Claims (3)

[Claims] 1. A tape comprising a polyolefin resin and having the following physical properties. (1) The tensile modulus in the MD direction is 15 to 150 MPa. (2) Stress at the time of 50% elongation in the MD direction is 5 to 30M
Pa and has no yield point. (3) Residual stress after 1 minute after elongation by 50% in the MD direction is 2
１６16 MPa. (4) The self-back surface adhesive strength in a wound state is 1 to 30 N.
/ 50mm or more, less than 30N / 50mm, and
The coefficient of dynamic friction after deployment is 1.0 or less. 2. The polyolefin resin is a polypropylene resin having a weight average molecular weight of 80,000 to 600,000, and the resin elution amount measured by the cross fractionation method is 40 to 70% by weight of the total polypropylene resin at 0 ° C. 3. The tape according to claim 1, wherein the content is 10 to 30% by weight above 70 ° C. and not more than 70 ° C., and 20 to 40% by weight above 70 ° C. 3. A stretching ratio of 1.1 to 5 in at least one direction.
The tape according to claim 1, wherein the tape is stretched by a factor of two.