JP3473281B2 - Low friction treatment agent for seat belt - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction reducing treatment agent applied to a seat belt webbing. More specifically, the present invention relates to a low-friction treatment agent that has good seatbelt storability and can retain storability satisfactorily even after wear, and is effective for obtaining a seatbelt having excellent storage durability.

[0002]

2. Description of the Related Art Conventionally, after weaving a raw yarn for a seat belt into a webbing and dyeing it, a resin coat is generally applied in order to facilitate the withdrawal and storage of the seat belt, that is, in order to improve the storability. It is being appreciated. Further, various processing agents such as a spinning oil agent are added to the seat belt raw yarn in the spinning / drawing process.

For example, as a coating resin for improving the wear resistance of a seat belt, a resin containing a urethane prepolymer block compound as a main component is known (Japanese Patent Publication No. Hei 4).
-66948). In this case, a resin containing a urethane prepolymer block compound as a main component is applied to the seat belt webbing, and a heat treatment is performed to cause cross-linking, thereby greatly improving the absolute value of the initial slip property, and thereby, for a long period of time. It is intended to obtain the desired level of lubricity even after the lubricity has been reduced by use.

As a conventional treating agent for seat belt raw yarn, a treating agent containing a composition of a branched alcohol, an ester of a higher fatty acid and a nonionic activator as a main component (for example, JP-A-2-175966). )It has been known. That is, this seat belt raw yarn treating agent is intended to improve the light resistance by using an ester of a branched alcohol and a higher fatty acid as a smoothing agent and a nonionic activator containing no propylene oxide.

[0005]

However, in the case of a resin-coated seat belt, especially in the case of a seat belt coated with a cross-linking type resin such as the former, the belt surface becomes hard, so that it is used for a long time. As a result, the resin coated on the surface is gradually scraped off and falls off due to repeated rubbing with the through (made of nylon resin) that is a guide for taking in and out the seat belt. Further, dirt is gradually attached to the belt surface. As a result, there has been a big problem that the storage and the withdrawal of the belt cannot be smoothly performed with the passage of time, and the storability is significantly deteriorated with the passage of time.

[0006] In the case of the conventional yarn applying treatment agent such as the latter, when it is used as a non-coated belt without a resin coating, there is no abrupt decrease in the slipping property due to the dropping of the resin, but there is a fiber-to-fiber friction and a fiber. -The metal-metal friction cannot be sufficiently reduced, the initial slip properties are poor, and the abrasion resistance is also poor, which is a major problem, and it has not been put to practical use.

Therefore, the present invention solves the above-mentioned problems in the prior art, and by imparting the same to the seat belt webbing, it is possible to sufficiently reduce the frictional characteristics of the fibers constituting the seat belt webbing. A seat belt that has sufficiently high slipperiness and can maintain its properties such as its slipperiness even after being used for a long period of time, that is, it has excellent storability and durability as well as excellent wear resistance retention rate. The main purpose of the present invention is to provide a low friction treatment agent for a seat belt, which is capable of obtaining a seat belt.

[0008]

In order to achieve the above-mentioned object, the friction reducing agent for seat belts of the present invention is a friction reducing agent for imparting seat belt webbing, and has an average molecular weight of It is characterized by containing a polyether polyester having an average molecular weight of 2000 to 15000, which is an esterified product of 600 to 6000 polytetramethylene glycol, a dibasic acid and a monovalent fatty acid.

The polyether polyester preferably accounts for 30% by weight or more of the entire treating agent. Further, it is preferably a treating agent applied to the polyester fiber seat belt webbing. Furthermore, it is an aqueous emulsion liquid containing the treating agent as an active ingredient and having a concentration of 1 to 20% by weight and having a surface tension at 25 ° C. of 35 dynes /
It is preferable that the friction reduction treatment liquid for seat belts has a permeability of 15 cm or less and a Campus method permeability of 15 seconds or less at 25 ° C.

Since the treating agent of the present invention has a large permeability into the inside of the webbing, the treating agent is uniformly coated on the surface of the seat belt webbing and the surface of the filament inside the belt constituting the same. be able to.
Therefore, unlike a conventional seat belt whose surface is coated with a resin, it does not have a two-layer structure of a resin layer and a belt (fiber) layer. Therefore, even if the fiber of the surface portion is scraped off due to long-term use, Since the treatment agent adheres to the fibers and has a low friction property, a seat belt having a high storability and a high wear resistance retention rate can be obtained.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The polyether polyester used in the treating agent of the present invention has an average molecular weight of 2000 to 150.
And an esterified product of polytetramethylene glycol having an average molecular weight of 600 to 6000, and a dibasic acid and a monovalent fatty acid. As the polyether polyester, both ends of a dibasic acid are esterified with polytetramethylene glycol, and further, both ends thereof are esterified with a monovalent fatty acid. A polyether polyester in which the ends are blocked is preferable.

The average molecular weight of the polyether polyester is required to be in the above range for its slipperiness and permeability into the inside of the webbing. When the average molecular weight is too small, less than 2000, the strength of the oil film becomes insufficient and the slipperiness after abrasion deteriorates, so that the desired effect cannot be obtained. Also,
If the molecular weight exceeds 15,000, the friction characteristics cannot be sufficiently improved, so that the slipperiness deteriorates and the desired effect cannot be obtained. A preferable average molecular weight is 3000 to 10000.
Is.

Further, the polyether component constituting the polyether polyester has an average molecular weight of 600 to 60.
00 polytetramethylene glycol. If the average molecular weight is too small, less than 600, the oil film will have insufficient strength and slipperiness will deteriorate. Also, the molecular weight is 600
If it exceeds 0, the friction becomes too large and the slipperiness deteriorates. A preferable average molecular weight is 800 to 4000.

The average molecular weight referred to in the present invention is the number average molecular weight measured by GPC (gel permeation chromatography) or the like.

Examples of the dibasic acid component constituting the polyether polyester include maleic acid, adipic acid, thiodipropionic acid, sebacic acid and the like. Adipic acid, thiodipropionic acid and sebacic acid are preferred. A dibasic acid having a cyclic structure such as an aromatic ring is preferable from the viewpoint of a friction reducing effect, and an aliphatic carboxylic acid is preferable.

Furthermore, as monovalent fatty acid components, octylic acid, lauric acid, myristic acid, palmitic acid,
Examples thereof include stearic acid, isostearic acid, oleic acid, ricinoleic acid, linoleic acid and linolenic acid. Lauric acid, isostearic acid and oleic acid are preferred.

Further, it is preferable that the polyether polyester is a substance which can maintain a liquid state at room temperature (20 to 25 ° C.). This is because the seat belt to which the treatment agent is applied can maintain a liquid state without becoming a paste even under ordinary temperature conditions in which it is used on a daily basis, so the desired function of low friction can be fully exerted during use. Is.

The above polyether polyester preferably accounts for 30 to 100% by weight of the whole treating agent, and may be used alone or in combination of two or more.
When the content is less than 30% by weight, the intended effect of the polyether polyester cannot be sufficiently exerted, and it is not preferable from the viewpoint of the slipperiness of the seat belt and the slipperiness after abrasion. It is preferably 40 to 100% by weight.

The friction-reducing agent of the present invention may contain a smoothing agent component (B), an extreme pressure agent component (C), a surfactant component (D), etc., other than the above polyether polyester.
The sum of their contents should be at most 70% by weight.

As the smoothing agent component (B), mineral oil (refined spindle oil, liquid paraffin), animal and vegetable oil (coconut oil, castor oil, etc.), fatty acid ester (isostearyl laurate, oleyl oleate, dioleyl adipate, etc.) ), Alkyl ether ester (laurate of ethylene oxide 2 mol adduct of lauryl alcohol, laurate of ethylene oxide 3 mol adduct of tridecyl alcohol, etc.), wax and the like. Among these, preferred are fatty acid ester and alkyl ether. It is an ester.

When the leveling agent component (B) is blended, the proportion is 5 to 30% by weight, particularly 10 to 20% by weight.
The range is good.

The extreme pressure agent component (C) is a component having an action of enhancing the oil film strength of the treating agent, and examples thereof include fatty acid soaps such as oleic acid soap and erucic acid soap, lauryl phosphate potassium salt, and oleyl phosphate. -Organophosphate salt such as sodium salt, lauryl sodium lauryl salt, and organic sulfonate salt such as sodium dodecylbenzene sulfonate.

When the extreme pressure agent component (B) is blended, the proportion thereof is preferably 0.02 to 10% by weight, particularly 1 to 5% by weight. If it is less than 0.02% by weight, the effect of increasing the strength of the oil film is not sufficiently exhibited, which is not preferable. On the other hand, if it exceeds 10% by weight, the increase in viscosity becomes large and the slipperiness deteriorates, which is not preferable.

As the surfactant (D), an alkylene oxide adduct of a higher alcohol (ethylene propion oxide adduct of octyl alcohol, ethylene propion oxide adduct of stearyl alcohol, ethylene oxide adduct of oleyl alcohol, etc.) ), And alkylene oxide adducts of polyhydric alcohol esters (such as 25 mol adducts of hydrogenated castor oil and 20 mol adducts of sorbitan trioleate with ethylene oxide).

When the surfactant component (D) is blended, the proportion thereof is preferably 5 to 20% by weight, particularly 10 to 15% by weight.

Furthermore, in the friction-reducing treatment agent of the present invention, in addition to the polyether polyester, the other smoothing agent component (B), the extreme pressure agent component (C) and the surfactant component (D), If necessary, other additives such as a pH adjusting agent such as an alkylene oxide adduct of an alkali metal or an alkylamine, an antioxidant, a UV absorber and a fluorine compound may be added.

When the pH adjusting agent is blended, the proportion thereof is 0.02 to 10% by weight, particularly 0.03 to 8% by weight.
The range is good. When compounding other additives,
Their proportion is 0.02 to 10% by weight, in particular 0.03.
A range of up to 5% by weight is preferred.

The friction-reducing treatment agent of the present invention is preferably used as a water-based emulsion liquid having a concentration of 1 to 20% by weight for the treatment of seat belt webbing, but the adhesiveness and permeability to the seat belt webbing are not impaired. If so, it may be used as a higher concentration aqueous emulsion liquid, may be used as a substantially undiluted stock solution, or may be used as a treatment liquid diluted with an organic solvent. An aqueous emulsion having a concentration of 2 to 10% by weight is particularly preferable.

When used as a treatment liquid for an aqueous emulsion having a concentration of 1 to 20% by weight, the surface tension of the treatment liquid at 25 ° C. is 35 dynes / cm or less, and the campus permeability at 25 ° C. is 15 seconds or less. It is preferable for adhesion to the seat belt webbing and penetration into the inside of the webbing. If the surface tension exceeds 35 dyne / cm, the adhesion to the webbing tends to be insufficient. Further, if the campus permeability exceeds 15 seconds, the permeability of the treatment agent is likely to deteriorate, which is not preferable because it enhances the durability of the storability.

The friction reducing treatment agent of the present invention is a treatment liquid such as an aqueous emulsion treatment liquid obtained by emulsifying the treatment agent,
It may be applied by any method such as a method of immersing the webbing in a liquid or a method of spraying the liquid onto the webbing surface at an arbitrary stage after weaving the raw yarn for seat belt into the webbing. When the webbing is dyed, it is preferable to apply a friction reducing treatment agent after the dyeing.

The coating amount of the treatment agent is the amount of the active ingredient of the treatment agent with respect to the fibers constituting the webbing, which is 0.05 to 5.0.
It may be wt%, preferably 0.1 to 1.5 wt%.

By applying the friction-reducing treatment agent of the present invention to the webbing, it is possible to satisfy the desired low-friction characteristics required for the seat belt.
The treated seat belt webbing can be used for a seat belt without a conventional resin coating.

Further, since the low-friction treatment agent of the present invention has remarkably excellent penetrability as compared with the conventional resin coat, the penetrability into the inside of the webbing is large and the treatment agent is applied to the surface of the seat belt webbing. In addition, the surface of the filament inside the belt constituting the same can be uniformly coated. Therefore, it does not have a two-layer structure of a resin layer and a belt (fiber) layer like a conventional seat belt in which only the belt surface is resin-coated, and therefore even if the fiber on the belt surface is scraped off by long-term use. Since the treatment agent adheres to the fibers inside as well and has a low friction property, it is possible to maintain a high storability and to obtain a seat belt having a high storability and wear resistance retention rate.

Examples of the seat belt webbing to which the low friction treatment agent of the present invention is applied include seat belt webbing composed of synthetic fibers such as polyester fibers.

The seat belt webbing provided with the low-rubbing treatment agent for seat belts of the present invention is significantly superior to conventional seat belts in terms of slipperiness, especially after long-term use, that is, in storage durability. The reason for being superior is that
It is considered to be due to the following action mechanism.

In a conventional seat belt, for example, a resin containing a urethane prepolymer block compound as a main component is applied to the belt (Japanese Patent Publication No. 4-66948) to improve slipperiness, but as described above, There is a problem that the resin layer coated on the surface of the belt is peeled off due to abrasion during repeated desorption of the belt for a long period of time, and the slipperiness is significantly deteriorated. In some cases, the resin that has been worn and peeled off becomes scum-like and hardens, or dirt is attached to the worn portion, causing abnormal slipperiness. Therefore, many attempts have been made to develop a resin having more excellent abrasion resistance, a method of coating a resin layer relatively thickly, and the like, but none have been sufficiently satisfied.

On the other hand, in the present invention, the slipperiness of the belt is not dependent on the coat resin layer, and the slipperiness is imparted to the surface layer of each filament of the yarns constituting the belt, thereby obtaining the desired slipperiness. It is what

The resin layer coated on the conventional seat belt covers the surface of the belt, and the resin is usually only partially penetrated into the inside of the belt. That is, the coating resin did not reach the surface of the filament located in the innermost layer of the belt, which can be confirmed by analyzing the surface substance of the fiber that decomposed the belt.

However, when the treatment agent of the present invention is applied, the treatment agent sufficiently penetrates not only to the belt surface but also to the innermost layer portion of the belt, and also to the surface of each filament of the yarns constituting the belt innermost layer. It is attached, and in this respect, it is significantly different from the conventional seat belt.

[0040]

EXAMPLES The present invention will be described in more detail with reference to the following examples. The evaluations in the following examples and comparative examples are performed and displayed by the following methods.

Fiber-Fiber Friction: With respect to the warp and weft obtained by disassembling the seat belt webbing to which the treating agent is applied, the friction coefficient between the fibers is measured using a radar-type friction measuring device. The smaller the value of this friction, the smaller the friction between fibers and the higher the flexibility, and the more excellent the slipperiness.

Friction between fiber and metal: In the same manner as described above, the coefficient of friction between fiber and metal of the decomposed yarn of the seat belt webbing is measured using a high load micron device of Toray Industries, Inc. The sliding speed between the fiber and the metal during the measurement is 0.5 m / min or 300 m / min. Friction at a sliding speed of 0.5 m / min represents the level of oil film strength,
The smaller the value, the stronger the oil film strength. Further, the friction when the sliding speed is 300 m / min represents the level of smoothness, and the smaller the value is, the better the sliding is.

Surface tension of treatment liquid (dyne / cm): 2
Kyowa Interface Science Co., Ltd. measures the surface tension of the treatment liquid under the condition of 5 ° C.
CBVP-A3 type automatic surface tensiometer manufactured by K.K. Campus Penetration of Treatment Liquid (sec): The treatment liquid was placed in a 100 cc beaker and the temperature was adjusted for 15 minutes in a constant temperature bath at 25 ° C., and then a wool felt having a size of 2 cm × 2 cm and a thickness of 3 mm was gently placed on the liquid surface. Measure the time (seconds) for floating and settling in the liquid. The measurement is performed 5 times and the average value is calculated.

Sliding friction with the through (%): A load of 500 g is set on one end of the seat belt, the middle part is inserted into the through, and a 10 kg load cell is set at the other end at an angle of 20 °. Strength (F1) when pulling the load with the load cell and strength (F1) when returning the load to the base
2) is measured and the value of the square root of (F2 / F1) × 100 is taken as the sliding friction (%). The higher the sliding friction value,
It has small friction characteristics and excellent storage.

Sliding friction after wear (%): Sandpaper (No. 500) was used as a friction body for the seat belt.
A belt surface is abraded by applying a load of 00 g and rubbing 500 times back and forth. After abrasion, the sliding friction with the through is measured by the same method as described above, and the sliding friction after abrasion (%) is obtained.

Hexagonal rod wear retention rate (%): According to the abrasion resistance test (JIS-4604 method), the strength of the seat belt after 5000 times of abrasion is measured, and the strength retention rate is calculated from the strength before abrasion. .

[Examples 1 to 4 and Comparative Examples 1 to 5] Polyethylene terephthalate was melt-spun and the spinning speed was 500 m.
/ Min, followed by unwinding, followed by two-stage stretching with a hot roller at 245 ° C. to a total draw ratio of 5 times, followed by winding at 3000 m / min, 15
A polyester filament yarn of 00 denier 144 filaments was produced.

A sheet belt webbing was manufactured by weaving the obtained polyester filament yarn by a usual method, dyed black by a usual method, and further, a concentration of 5% by weight of the treating agent having the composition shown in Table 1 was obtained. After dipping in a water emulsion solution of, the treatment agent of 0.5% by weight based on the total weight of the fiber of the webbing is attached to the treatment agent, and then 110 ° C.
Pre-dried for 3 minutes at 150 ° C., then heat-treated at 150 ° C. for 3 minutes.

The symbols of the treating agent components in Table 1 represent the compounds shown below. A1 to A3 are polyether polyesters, B1 is a smoothing agent component (B) other than that, C1 to C2 is an extreme pressure agent component (C),
D1 to D3 are surfactant components (C), and E1
-E2 are other additives. In addition, R1 and R2 are
It is a resin component used in a conventional resin coat.

A1 ... Polytetramethylene glycol (1700) ester of adipic acid and oleic acid (molecular weight 4000) A2 ... Polytetramethylene glycol ester of thiodipropionic acid and isostearic acid (molecular weight 100)
0) A3 ··· Polytetramethylene glycol, sebacic acid and isostearic acid ester (molecular weight 20000) B1 ··· oleyl oleate

C1 ·· lauryl (EO) 2 phosphate K salt C2 ·· oleic acid soap D1 ·· lauryl alcohol PO · EO adduct (molecular weight 1500) D2 ·· oleyl alcohol EO adduct (molecular weight 90
0) D3 ··· hydrogenated castor oil (EO) 10 mol adduct E1 · · “IRGANOX” 245 (manufactured by Ciba Geigy) E2 · · stearylamine (EO) 10 mol adduct R1 · · hydroxy-containing silicone, urethane prepolymer block -Based resin R2 ... Methylol melamine resin

[0052]

[Table 1] Note) The numbers in the table indicate weight%.

Table 2 shows the results of evaluation of the characteristics of the seat belt obtained by attaching the treatment agent.

[0054]

[Table 2]

As is clear from Table 2, in the case of Examples 1 to 4 according to the present invention, the friction characteristics of the fibers constituting the seat belt are low, the slipperiness between the seat belt and the through is good, and Even after being worn, the slipperiness between the seat belt and the through did not substantially deteriorate, and the storability and its durability were excellent. Moreover, the hexagonal rod was excellent in durability due to abrasion.

On the other hand, in the case of Comparative Examples 1 and 2 in which the average molecular weight of the polyether polyester is outside the scope of the present invention, in the case of Comparative Example 3 in which the treating agent not containing the polyether polyester of the present invention is added, and in the conventional case. In Comparative Examples 4 and 5 in which the coating resin of No. 2 was applied, the better the slipperiness with the through, the worse the slippage due to abrasion, and in all cases, the slipperiness after abrasion was unsatisfactory. Further, the durability due to abrasion of the hexagonal bar was also poor.

[0057]

When the low friction treatment agent for a seat belt of the present invention is applied to a seat belt webbing, the friction characteristics of the fibers constituting the seat belt webbing are sufficiently lowered and the initial slipperiness is increased to a sufficient level. In addition, the characteristics such as the slipperiness can be favorably maintained even after long-term use. Therefore, it is possible to obtain a seat belt that is excellent in storability and durability and is also excellent in wear resistance retention rate.

Particularly, it is effective as a friction reducing agent for polyester fiber seat belt webbing, and it is possible to obtain a polyester fiber seat belt excellent in slipperiness, abrasion resistance and storability.

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Claims (5)

(57) [Claims] 1. A low friction treatment agent for imparting seat belt webbing, having an average molecular weight of 600 to 60.
It is an esterified product of polytetramethylene glycol of 00, a dibasic acid and a monovalent fatty acid, and has an average molecular weight of 200.
A friction reducing agent for seat belts, which contains a polyether polyester having a weight ratio of 0 to 15,000. 2. The friction reducing treatment agent for seat belts according to claim 1, wherein the polyether polyester accounts for 30% by weight or more of the entire treatment agent. 3. A low friction treatment agent for imparting seat belt webbing, and having an average molecular weight of 600 to 60.
It is an esterified product of polytetramethylene glycol of 00, a dibasic acid and a monovalent fatty acid, and has an average molecular weight of 200.
A low friction treatment agent for a seat belt, which comprises a polyether polyester of 0 to 15000 and an extreme pressure agent component. 4. The friction reducing agent for seat belts according to claim 1, which is a friction reducing agent applied to a polyester fiber seat belt webbing. 5. An aqueous emulsion liquid containing the friction-reducing agent according to claim 1, 2, 3 or 4 as an active ingredient and having a concentration of 1 to 20% by weight, and having a surface tension at 25 ° C. of 35.
A friction reducing treatment liquid for a seat belt, which has a dyne / cm or less and a Campus Method permeability at 25 ° C. of 15 seconds or less.