KR20130089352A - Toothbrush and method for preparing the same - Google Patents

Abstract

PURPOSE: A brush and a toothbrush using the same are provided to have excellent interfacial adhesion and improve intensity and a bending recovery rate by including elastic materials and one selected from polyester resin or polyester copolymer resin. CONSTITUTION: A brush comprises a core layer and a sheath layer. The core layer includes elastic materials and one selected from polyester resin, polyester copolymer resin and a mixture thereof. The sheath layer includes nylon resin.

Description

Toothbrush and method for preparing the same

The present invention relates to bristles. More specifically, the present invention relates to a bristles comprising any one selected from a polyester resin, a polyester copolymer resin, or a mixture thereof, a core layer including an elastic material, and a sheath layer including a nylon resin.

It also relates to a toothbrush comprising the bristles.

Toothbrush is a typical cleaning tool used to clean the mouth. In general, a toothbrush is composed of a toothbrush bag molded from plastic and bristles of nylon on one end portion thereof.

The nylon material used for the bristles is generally made by melt spinning a nylon 610 and a nylon 612 resin. However, the nylon has a disadvantage in that the strength and durability of the bristle physical properties of the bristle required for use in the bristles and the moisture absorption are significantly lower than those of the polyester filament, which easily bends and does not produce a constant elasticity and strength.

Korean Patent Application Publication No. 1998-082012 “Toothbrush having a brush head composed mainly of silicone and nylon” relates to a toothbrush provided with alternating silicon bristles and nylon bristles, which prevents stimulation of gums when brushing teeth, thereby preventing bleeding gums. To prevent side effects such as softer and softer silicone bristles and provides a toothbrush containing nylon bristles to increase the brushing effect. However, toothbrushes made of silicone and nylon have the disadvantage of less brushing because the brushes are so soft and thick.

In order to solve these problems, there is a need for a soft bristle with excellent durability and mechanical properties. Accordingly, the study of the bristles that can realize excellent elasticity and durability by using a combination of polyester, but strong and hard and easily wear out of the polyester and soft but tough durability.

Korea Patent Publication No. 1998-082012 (November 25, 1998)

It is an object of the present invention to provide bristles with improved strength and elasticity of bristles.

Another object of the present invention is to provide a toothbrush comprising the bristles.

The present invention for achieving the above object, relates to a bristle consisting of a sheath layer comprising a nylon layer and a core layer comprising an elastic material and any one selected from a polyester resin, a polyester copolymer resin or a mixture thereof.

The present invention also relates to a toothbrush comprising the bristles.

Hereinafter, each structure which comprises the bristles of this invention is demonstrated concretely.

In the present invention, the core layer includes any one selected from a polyester resin, a polyester copolymer resin or a mixture thereof and an elastic material. In addition, the core layer may further include an additive.

The polyester resin is obtained by polymerizing an acid component including terephthalic acid and a diol component including ethylene glycol, an acid moiety derived from the acid component, and a diol moiety derived from a diol component. ) Has a repeating structure. In the present invention, the polyester resin may be any one or two or more selected from polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT) and the like. In the present invention, it is preferable to use the polyester resin having a number average molecular weight of 15,000 to 70,000, since the strength and elasticity of the bristles can be further improved.

The polyester copolymer resin is a diol component derived from an acid moiety and a diol component derived from the acid component by polymerizing an acid component including terephthalic acid and a diol component including ethylene glycol. Another acid component or diol component may be copolymerized to a polyester resin having a repeating structure of diol moiety.

The acid component to be copolymerized is a terephthalic acid component, isophthalic acid mixed with terephthalic acid in order to improve the physical properties of the polyester resin. Copolymers having dicarboxylic acids such as naphthalenedicarboxylic acid, diphenoxyethane dicarboxylic acid and diphenyl ether dicarboxylic acid can be used. The content of the copolymerized acid component for physical property improvement may include 1 to 15% by weight. It is because including the acid component in the above range is sufficient to improve the hard and easily worn physical properties of the polyester.

In addition, the copolymerized diol component includes ethylene glycol, and more specifically, a copolymer having propanediol, butanediol, pentanediol, hexanediol, cyclohexanedimethanol, neopentin glycol, and polyethylene glycol may be used. The content of the copolymerized diol component including the ethylene glycol is preferably 85 to 99% by weight. When included in the range as described above, the moldability defect due to the crystallization can be reduced, it is preferable because the workability is improved by lowering the viscosity.

In the present invention, the polyester copolymer resin may be prepared through an esterification reaction and a polycondensation reaction, but is not limited thereto, and a method of copolymerizing in general may be used. However, in the present invention, preferably, the esterification reaction proceeds for 100 minutes to 20 hours under a pressurized pressure of 200 to 300 ° C. and 0.1 to 3.0 kg / cm ² to maintain the polymerization reaction rate appropriately.

The elastic material may be polycaprolactone urethane resin, polyester urethane resin, polyether urethane resin, silicone resin, ethylene-α olefin elastomer, propylene-α olefin elastomer, thermoplastic olefin elastomer, styrene-butadiene block It includes one or two or more selected from a copolymer, a styrene-isoprene block copolymer, a thermoplastic styrene-based elastomer, 1 to 50% by weight of any one selected from the polyester resin or polyester copolymer resin It is preferable to include a part. By including the elastic material in the above range, while maintaining the strength of the existing polyester resin has the effect of improving the elasticity that was not sufficiently expressed in the polyester resin. In addition, the interfacial adhesion of the core layer including the polyester resin and the elastic material and the sheath layer including the nylon resin helps to be further improved, and when the toothbrush including the bristles is used, the tooth cleaning effect To further increase.

The additive may include any one selected from an abrasive or a mixture of a coupling agent and an abrasive, but is not limited thereto. An additive commonly used may be used. More specifically, the abrasive may be any one selected from silicon dioxide, aluminum hydroxide, calcium carbonate, silica, bentonite clay, calcium phosphate, dicalcium phosphate or anhydrous calcium phosphate, or a mixture thereof, but is not limited thereto. The coupling agent may also be used to increase the interaction between the nylon resin and the abrasive. The additive is included by 0.1 to 10 parts by weight with respect to 100 parts by weight of the polyester resin to further increase the strength of the bristle, toothbrush comprising it can give a cool toothbrush.

In the present invention, when measuring the core layer by KS G 3103, the flexural recovery rate (F _C ) includes the following Chemical Formula 1, and the strength (S _C ) measured by the KS K 0412 measuring method includes the following Chemical Formula 2, and elongation: It is preferable that (E _C ) contains following formula (3). This is because bristle bridging rate and strength of bristles can be increased to minimize bristles of bristles.

[Formula 1]

20% ≤ F _C ≤ 40%

[Formula 2]

900 cm / N ≤ S _C <1,300 cm / N

(3)

9% <E _C ≤ 20%

In the present invention, the sheath layer includes a nylon resin, and when measured by KS G 3103, the flexural recovery rate (F _S ) includes the following Formula 4, and the strength (S _S ) measured by the KS K 0412 measurement method is represented by the following Formula 5 It includes, and elongation (E _S ) preferably comprises the following formula (6). When the sheath layer includes the following Chemical Formulas 4 to 6, excellent strength and soft bristles may be obtained.

[Formula 4]

30% ≤ F _S ≤ 50%

[Chemical Formula 5]

800 cm / N ≤ S _S <1,100 cm / N

[Formula 6]

10% <E _S ≤ 35%

The nylon resin may use any one or two or more selected from nylon 612 resin and nylon 610 resin, preferably nylon 612 resin. It is preferable that the nylon resin has a weight average molecular weight of 10,000 to 50,000, because it prevents the strength of the bristles from being higher than necessary due to the polyester resin of the core layer, and thus maintains a constant elasticity and strength. to be.

The bristle of the present invention comprises 20 to 80% by weight of the core layer, 20 to 80% by weight of the sheath layer, the diameter of the bristle is 0.05 ~ 0.25㎛, the diameter of the core layer is preferably 0.001 ~ 0.2㎛. When the diameter of the bristles is as described above, an excellent cleaning effect can be obtained. In addition, when the bristles are measured by KS G 3103, the flexural recovery rate (F _t ) includes the following formula (7), and the strength (S _t ) measured by the KS K 0412 measuring method includes the following formula (8), and elongation (E _t ) preferably includes the following formula (9).

[Formula 7]

40% ≤ F _t ≤ 60%

[Formula 8]

800 cm / N ≤ S _t ≤ 1500 cm / N

[Chemical Formula 9]

20% ≤ E _t ≤ 40%

It is a physical property expressed by the flexural recovery rate, strength and elongation of the core layer and the sheath layer, and when the bristles have the above ranges, soft and durable bristles can be obtained, thereby obtaining a cool brushing feeling and an improved cleaning effect. Can be.

In addition, the present invention relates to a toothbrush including the bristles, the bristles of the bristles can be minimized to increase the life of the toothbrush.

The present invention relates to bristle, the bristle is prepared by including any one selected from the polyester resin or polyester copolymer resin and the elastic material, the interface adhesion is more excellent, the strength and flexural recovery rate is further improved It is soft and durable.

In addition, when using the toothbrush containing the bristles of the present invention can obtain a cool brushing and improved cleaning effect.

Hereinafter, the present invention will be described by way of example in order to describe the present invention in more detail, but the present invention is not limited to the following examples.

Hereinafter, physical properties were measured by the following method.

1. Strength measurement

Filament Tensile Strength Measurement Method Using Universal Testing Machine The physical properties measured by KS K0412 measurement method are shown in Table 1 below.

2. Measurement of flexion recovery

Flexural recovery rate is shown in Table 1 below the physical properties measured by the toothbrush standard KS G3103 measurement method.

3. Deformed gap measurement

The durability of the bristles refers to a wearing test that measures hair swelling, and it was calculated by the following formula 1 by repeatedly reciprocating the planted toothbrushes at the same rate as twice per second to the irregularities of the same shape as the teeth. The results are shown in Table 2 below.

[Formula 1]

L ₁ = diameter of the brush before brushing

L ₂ = simulated diameter after brushing

4. Assessing consumer preference for usability.

Results of measuring the average value using the five-point comparison method for the usability through the comparison panel test after using the toothbrush manufactured in the present invention and the existing toothbrush for a certain period of time (7 days) among 50 panelists. 3 is shown.

Example 1

 15 g of terephthalic acid and 85 g of ethylene glycol were added to a 3L reactor equipped with a stirrer and an outflow condenser and mixed, followed by esterification at 225 ° C for 10 hours. 7 g of isophthalic acid was added during the esterification reaction. After the reaction was completed, the reaction mixture was transferred to a polycondensation reactor equipped with a reactor, a cooling capacitor, and a vacuum system, and 50 ppm of aluminum, 50 ppm of triethylphosphate, and 50 ppm of cobalt acetate were added thereto, followed by reaction at 270 ° C. for 10 hours to prepare a polyester copolymer. It was prepared that the viscosity is 0.9 dl / g.

200 g of the polyester copolymer prepared above, 200 g of polybutylene terephthalate resin (number average molecular weight 35,000), and 80 g of silicone resin (MB50-010, Ohsung Polytech) were mixed and added to the first extruder.

600 g of nylon 612 resin (weight average molecular weight 20,000) was introduced into a second extruder. At this time, the temperature of the first extruder was 260 ℃, the pressure was 600psi, the temperature of the second extruder was 250 ℃, the pressure was 800psi. The filament spun by the nozzle pack was obtained, cooled at 20 ° C, and stretched five times. The physical properties of the core layer, the sheath layer and the bristles used at this time are shown in Table 1 below.

[Example 2]

 15 g of terephthalic acid and 85 g of ethylene glycol were added to a 3L reactor equipped with a stirrer and an outflow condenser and mixed, followed by esterification at 225 ° C for 10 hours. 7 g of isophthalic acid was added during the esterification reaction. After the reaction was completed, the reaction mixture was transferred to a polycondensation reactor equipped with a reactor, a cooling capacitor, and a vacuum system, and 50 ppm of aluminum, 50 ppm of triethylphosphate, and 50 ppm of cobalt acetate were added thereto, followed by reaction at 270 ° C. for 10 hours to prepare a polyester copolymer. It was prepared that the viscosity is 0.9 dl / g.

200 g of the polyester copolymer prepared above, 200 g of polybutylene terephthalate resin (number average molecular weight 35,000), and 80 g of a thermoplastic olefin-based elastomer (6560N, Mitsui Corporation) were mixed and introduced into a first extruder.

600 g of nylon 612 resin (weight average molecular weight 20,000) was introduced into a second extruder. At this time, the temperature of the first extruder was 260 ℃, the pressure was 600psi, the temperature of the second extruder was 250 ℃, the pressure was 800psi. The filament spun by the nozzle pack was obtained, cooled at 20 ° C, and stretched five times. The physical properties of the core layer, the sheath layer and the bristles used at this time are shown in Table 1 below.

[Example 3]

 15 g of terephthalic acid and 85 g of ethylene glycol were added to a 3L reactor equipped with a stirrer and an outflow condenser and mixed, followed by esterification at 225 ° C for 10 hours. 7 g of isophthalic acid was added during the esterification reaction. After the reaction was completed, the reaction mixture was transferred to a polycondensation reactor equipped with a reactor, a cooling capacitor, and a vacuum system, and 50 ppm of aluminum, 50 ppm of triethylphosphate, and 50 ppm of cobalt acetate were added thereto, followed by reaction at 270 ° C. for 10 hours to prepare a polyester copolymer. It was prepared that the viscosity is 0.9 dl / g.

400 g of the polyester copolymer prepared above and 80 g of a silicone resin (MB50-010, Ohsung Polytech) were mixed and introduced into a first extruder.

600 g of nylon 612 resin (weight average molecular weight 20,000) was introduced into a second extruder. At this time, the temperature of the first extruder was 260 ℃, the pressure was 600psi, the temperature of the second extruder was 250 ℃, the pressure was 800psi. The filament spun by the nozzle pack was obtained, cooled at 20 ° C, and stretched five times. The physical properties of the core layer, the sheath layer and the bristles used at this time are shown in Table 1 below.

Example 4

 400 g of polybutylene terephthalate resin (number average molecular weight 35,000) and 80 g of silicone resin (MB50-010, Ohsung Polytech) were mixed and introduced into a first extruder.

600 g of nylon 612 resin was added to a second extruder. At this time, the temperature of the first extruder was 260 ℃, the pressure was 600psi, the temperature of the second extruder was 250 ℃, the pressure was 800psi. The filament spun by the nozzle pack was obtained, cooled at 20 ° C, and stretched five times. The physical properties of the core layer, sheath layer and the bristles used at this time are shown in Table 1 below.

Comparative Example 1

400 g of polybutylene terephthalate resin (number average molecular weight 35,000) was put into the first extruder, and 600 g of nylon 612 resin (weight average molecular weight 20,000) was put into the second extruder.

The temperature of the first extruder was 260 ° C., the pressure was 600 psi, the temperature of the second extruder was 250 ° C., and the pressure was 800 psi. The filament of the core-sheath structure spun into the nozzle pack was obtained, cooled at 20 ° C, and stretched five times. The physical properties of the core layer, sheath layer and the bristles used at this time are shown in Table 1 below.

 Comparative Example 2

 It is a conventional toothbrush made with only ordinary nylon (nylon).

[Table 1]

[Table 2]

[Table 3]

*Evaluation standard

5: very good

4: good

3: Usually

2: defective

1: very poor

Claims (10)

A core layer comprising any one selected from a polyester resin, a polyester copolymer resin or a mixture thereof and an elastic material;
A sheath layer comprising nylon resin;
Brush head containing. The method of claim 1,
The elastic material may be polycaprolactone urethane resin, polyester urethane resin, polyether urethane resin, silicone resin, ethylene-α olefin elastomer, propylene-α olefin elastomer, thermoplastic olefin elastomer, styrene-butadiene block A bristles comprising one or more selected from coalescing, styrene-isoprene block copolymers, thermoplastic styrene-based elastomers. The method of claim 2,
Wherein the elastic material is 1 to 50 parts by weight of any one selected from the polyester resin, polyester copolymer resin or a mixture thereof 100 parts by weight, bristles. The method of claim 1,
The polyester resin bristles including one or two or more selected from polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate. The method of claim 1,
The nylon resin is bristles including one or two or more selected from nylon 612 resin and nylon 610 resin. The method of claim 1,
The bristle diameter is 0.05 ~ 0.25 ㎛, the diameter of the core layer is 0.001 ~ 0.2 ㎛ bristle. The method of claim 1,
As a result of measuring the core layer by KS G 3103, the flexural recovery rate (F _C ) includes the following Chemical Formula 1, and the strength (S _C ) measured by the KS K 0412 measuring method includes the following Chemical Formula 2, and the elongation (E) _C ) the brush head containing the following formula 3.
[Formula 1]
20% ≤ F _C ≤ 40%
(2)
900 cm / N ≤ S _C <1,300 cm / N
(3)
9% <E _C ≤ 20% The method of claim 1,
As a result of measuring the sheath layer by KS G 3103, the flexural recovery rate (F _S ) includes the following Chemical Formula 4, and the strength (S _S ) measured by the KS K 0412 measuring method includes the following Chemical Formula 5, and the elongation (E) _S ) is bristles comprising the following formula (6).
[Chemical Formula 4]
30% ≤ F _S ≤ 50%
[Chemical Formula 5]
800 cm / N ≤ S _S <1,100 cm / N
[Chemical Formula 6]
10% <E _S ≤ 35% The method according to any one of claims 1 to 8,
As a result of measuring the bristles with KS G 3103, the flexural recovery rate (F _t ) includes the following formula (7), and the strength (S _t ) measured by the KS K 0412 measuring method includes the following formula (8), and elongation (E _t): ) Is bristles comprising the following formula (9).
(7)
40% ≤ F _t ≤ 60%
[Chemical Formula 8]
800 cm / N ≤ S _t ≤ 1500 cm / N
[Chemical Formula 9]
20% ≤ E _t ≤ 40% Toothbrush using the bristles of claim 9.