JPH1037075A - Low friction treatment agent for seat belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seatbelt having excellent storability, durability, and excellent abrasion resistance retention rate by applying to a seatbelt webbing, and low friction for a seatbelt webbing treatment. A chemical treating agent is provided. An esterified product of polytetramethylene glycol having an average molecular weight of 600 to 6000, a dibasic acid and a monovalent fatty acid, having an average molecular weight of 2,000 to 2,000.
A seat belt low friction treating agent containing 15000 polyether polyester is applied to the seat belt webbing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low friction treating agent applied to a seat belt webbing. More specifically, the present invention relates to a low-friction treating agent which has good storage stability of a seat belt, can maintain good storage stability even after abrasion, and is effective for obtaining a seat belt having excellent storage durability.

[0002]

2. Description of the Related Art Conventionally, it is common practice to weave a yarn for a seat belt, dye the webbing into webbing, and then apply a resin coat to facilitate pulling out and storing of the seat belt, that is, to improve storage stability. Have been done. Further, various treating agents such as a spinning oil agent are applied to the original yarn for the seat belt in the spinning / drawing process.

For example, as a coating resin for improving the abrasion 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 (1994)).
-66948). In this case, a resin containing a urethane prepolymer block compound as a main component is applied to the seatbelt webbing, and crosslinking is caused by performing a heat treatment to greatly improve the absolute value of the initial slipperiness. It is intended to obtain a desired level of slippage even after the slippage has been reduced by use.

Further, as a conventional treating agent for a seatbelt yarn, a treating agent mainly comprising a composition of a branched alcohol, an ester of a higher fatty acid and a nonionic activator (for example, JP-A-2-175966). )It has been known. That is, the treatment agent for a seat belt raw yarn is intended to improve light fastness by using an ester of a branched alcohol and a higher fatty acid as a leveling agent and using a non-ionic 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. The resin coated on the surface is gradually scraped off by repeated rubbing with a through (made of nylon resin), which is a guide for assisting in and out of the seat belt. Further, dirt gradually adheres to the belt surface. As a result, there has been a serious problem that the belt cannot be stored or pulled out smoothly with time, and the storage property is significantly reduced with time.

In the case of the conventional yarn imparting treatment agent such as the latter, if it is used as a non-coated belt without a resin coat, there is no sharp drop in slippage due to resin falling off or the like. -There is a major problem that the friction between metals cannot be sufficiently reduced, the initial slip property is poor, and the wear resistance is also poor, so that it has not been put to practical use.

Therefore, the present invention solves the above-mentioned problems in the prior art, and by applying the present invention to a seat belt webbing, the frictional properties of the fibers constituting the webbing can be sufficiently reduced, and the initial state of the seat belt can be reduced. A seat belt that has a sufficiently high slip property and can maintain its properties such as slip property well after long-term use, that is, it has excellent storage stability and durability, and also has excellent abrasion resistance retention rate. It is a main object of the present invention to provide a low-friction treating agent for a seat belt that can obtain a seat belt.

[0008]

Means for Solving the Problems To achieve the above object, a low friction treating agent for a seat belt according to the present invention is a low friction treating agent for applying a seat belt webbing, and has an average molecular weight. An esterified product of 600 to 6000 polytetramethylene glycol, a dibasic acid and a monovalent fatty acid, characterized by containing a polyether polyester having an average molecular weight of 2,000 to 15,000.

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

Since the treating agent of the present invention has a high permeability into the inside of the webbing, the treating agent is uniformly coated on both 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. Since the treatment agent is also attached to the fibers and has low friction properties, a seat belt having a high storage stability and a high abrasion resistance retention rate can be obtained.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The polyether polyester used in the treating agent of the present invention has an average molecular weight of 2,000 to 150.
It must be an ester of polytetramethylene glycol having an average molecular weight of 600 to 6000, a dibasic acid and a monovalent fatty acid. As the polyether polyester, both terminals of a dibasic acid are esterified with polytetramethylene glycol and both terminals are esterified with a monovalent fatty acid, such as a compound obtained by esterifying both terminals with a monovalent fatty acid. Polyether polyesters whose ends are blocked are preferred.

[0012] The average molecular weight of the polyether polyester needs to be in the above range for slipperiness and permeability into the webbing. If 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,
When the molecular weight exceeds 15,000, the friction characteristics cannot be sufficiently improved, so that the slipperiness is deteriorated and the desired effect cannot be obtained. Preferred average molecular weight is 3000-10000
It is.

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 strength of the oil film becomes insufficient and the slipperiness is deteriorated. In addition, the molecular weight is 600
If it exceeds 0, the friction becomes too large and the slipperiness deteriorates. The preferred average molecular weight is from 800 to 4000.

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

The dibasic acid component constituting the polyether polyester includes maleic acid, adipic acid, thiodipropionic acid, sebacic acid and the like. Preferred are adipic acid, thiodipropionic acid and sebacic acid. In addition, 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.

Further, the monovalent fatty acid component includes octylic acid, lauric acid, myristic acid, palmitic acid,
Stearic acid, isostearic acid, oleic acid, ricinoleic acid, linoleic acid, linolenic acid, and the like. Preferably, lauric acid, isostearic acid, and oleic acid are good.

Further, it is preferable that the polyether polyester can maintain a liquid state at normal temperature (20 to 25 ° C.). This is because the seat belt to which the treating agent is applied can be kept in a liquid state without becoming a paste even under normal temperature conditions where it is used on a daily basis, so that the intended function of low friction can be sufficiently exhibited at the time of use. It is.

The above-mentioned polyether polyester preferably accounts for 30 to 100% by weight of the entire treating agent, and may be used alone or in combination of two or more.
If the content is less than 30% by weight, the intended effect of the polyether polyester is difficult to sufficiently exert, which is not preferable in terms of the slipperiness of the seat belt and the slipperiness after abrasion. Preferably, the content is 40 to 100% by weight.

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

The leveling agent component (B) includes 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 esters (such as laurate of adduct of lauryl alcohol with 2 moles of ethylene oxide, and laurate of tridecyl alcohol with 3 moles of ethylene oxide). Of these, preferred are fatty acid esters and alkyl ethers. It is an ester.

When the leveling agent component (B) is blended, its proportion is 5 to 30% by weight, especially 10 to 20% by weight.
Range is good.

The extreme pressure agent component (C) is a component having an effect of increasing the oil film strength of the treating agent, and includes, for example, fatty acid soaps such as oleic acid soap and erucic acid soap, potassium lauryl phosphate, and oleyl phosphate. And organic sulfonate salts such as sodium phosphate and sodium lauryl sulfonate, and sodium dodecylbenzene sulfonate.

When the extreme pressure agent component (B) is blended, its proportion is preferably in the range of 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 oil film strength is not sufficiently exhibited, which is not preferable. On the other hand, if it exceeds 10% by weight, the increase in viscosity increases and the slipperiness deteriorates.

As the surfactant (D), alkylene oxide adducts of higher alcohols (ethylene / propion oxide adduct of octyl alcohol, ethylene / propion oxide adduct of stearyl alcohol, ethylene oxide adduct of oleyl alcohol, etc.) ), Alkylene oxide adducts of polyhydric alcohol esters (eg, 25 mol adduct of ethylene oxide of hydrogenated castor oil, 20 mol adduct of ethylene oxide of sorbitan triolate).

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

Furthermore, in addition to the above-mentioned polyether polyester, the other smoothing agent component (B), the extreme pressure agent component (C) and the surfactant component (D), the friction reducing agent of the present invention includes Other additives such as an alkali metal, a pH adjuster such as an alkylamine oxide adduct of an alkylamine, an antioxidant, an ultraviolet absorber and a fluorine compound may be added as necessary.

When the above-mentioned pH adjuster is blended, its proportion is 0.02 to 10% by weight, particularly 0.03 to 8% by weight.
Range is good. When compounding other additives,
Their proportion is from 0.02 to 10% by weight, in particular 0.03% by weight.
The range is preferably up to 5% by weight.

The friction-reducing agent of the present invention is preferably used as an aqueous emulsion having a concentration of 1 to 20% by weight in the treatment of seat belt webbing, but the adhesion to the seat belt webbing and the permeability are not impaired. Then, it may be used in a more concentrated aqueous emulsion liquid, may be used in a substantially undiluted liquid state, or may be used as a treatment liquid diluted with an organic solvent. Particularly preferably, an aqueous emulsion having a concentration of 2 to 10% by weight is preferred.

When used as a treatment solution of an aqueous emulsion having a concentration of 1 to 20% by weight, the treatment solution may have a surface tension at 25 ° C. of 35 dynes / cm or less and a campus permeability at 25 ° C. of 15 seconds or less. This is preferable for adhering to the seat belt webbing and penetrating into the inside of the webbing. If the surface tension exceeds 35 dynes / cm, the adhesion to the webbing tends to be insufficient. On the other hand, when the campus permeability exceeds 15 seconds, the permeability of the treatment agent tends to deteriorate, which is not preferable because the durability of the storage property is enhanced.

The low-friction treating agent of the present invention is formed into a treating solution such as an aqueous emulsion treating solution in which the treating agent is emulsified,
At any stage after weaving the webbing for the seatbelt into webbing, the webbing may be applied by any method such as a method of immersing the webbing in a liquid or a method of spraying the liquid on the webbing surface. When the webbing is dyed, it is preferable to apply a low friction treating agent after the dyeing.

The amount of the treatment agent is 0.05 to 5.0, which is the amount of the effective component of the treatment agent with respect to the fibers constituting the webbing.
% By weight, preferably 0.1 to 1.5% by weight.

The low friction treating agent of the present invention can satisfy desired low friction characteristics required for a seat belt by being applied to webbing.
The treated seatbelt webbing can be used for a seatbelt without applying a conventional resin coat.

Furthermore, since the low friction treatment agent of the present invention has much better permeability than conventional resin coats, it has a high penetration into the webbing, and the treatment agent is applied to the surface of the seat belt webbing. In addition, it is possible to uniformly coat the surface of the filament inside the belt constituting the belt. Therefore, since the belt does not have a two-layer structure of a resin layer and a belt (fiber) layer as in a conventional seat belt in which only the belt surface is resin-coated, even if fibers on the belt surface are scraped off by long-term use. In addition, since the treating agent also adheres to the internal fibers and has a low friction property, a high storage property can be maintained, and a seat belt having a high wear resistance retention rate of the storage property can be obtained.

The seat belt webbing to which the friction reducing agent of the present invention is applied includes a seat belt webbing made of synthetic fibers such as polyester fibers.

The seatbelt webbing to which the friction reducing agent for a seatbelt of the present invention is applied is remarkably superior in slipperiness, especially after long-term use, to the storage durability as compared with conventional seatbelts. The reason for being excellent is
It is thought to be due to the following mechanism of action.

In a conventional seat belt, for example, the slip property is improved by applying a resin containing a urethane prepolymer block compound as a main component to the belt (Japanese Patent Publication No. 4-66948). There has been a problem that the resin layer coated on the belt surface is peeled off due to abrasion when the belt is repeatedly attached and detached for a long period of time, and the slipperiness is significantly deteriorated. In some cases, the resin that has been abraded and peeled off may form a scum and accumulate, or a dirt may adhere to the abraded portion, resulting in abnormal slipperiness. For this reason, many attempts have been made to develop a resin having more excellent wear resistance and to apply a relatively thick resin layer. However, no satisfactory resin has been obtained.

On the other hand, in the present invention, the slip property of the individual filaments of the yarn constituting the belt is imparted to the surface layer without depending on the slip property of the belt, thereby obtaining the desired slip property. It is assumed that.

A resin layer coated on a conventional seat belt covers the surface of the belt, and usually only a part of the resin permeates into the inside of the belt. That is, the coating resin does not reach the surface of the filament located at the innermost layer portion of the belt, which can be confirmed by analyzing the surface material of the fiber decomposed from the belt.

However, when the treating agent of the present invention is applied, the treating agent sufficiently penetrates not only on the belt surface but also on the innermost layer portion of the belt, and also on the surface of each filament of the yarn constituting the innermost layer of the belt. In this respect, it is significantly different from the conventional seat belt.

[0040]

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 indicated by the following methods.

Fiber-to-fiber friction: A warp and a weft obtained by disassembling a seat belt webbing to which a treatment agent has been applied are measured for a coefficient of friction between the fibers using a radar type friction measuring device. The smaller the value of the friction, the smaller the friction between the fibers and the higher the flexibility, so the more excellent the sliding property.

Fiber-Metal Friction: In the same manner as above, the coefficient of friction between the fiber and the metal is measured for the decomposed yarn of the seat belt webbing by using a high-load micron device of Toray Industries, Inc. The sliding speed between the fiber and the metal at the time of 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 higher the oil film strength. Further, the friction at a sliding speed of 300 m / min represents the level of smoothness, and a smaller value means that the sliding is better.

Surface tension of treatment liquid (dyne / cm): 2
The surface tension of the processing solution was measured at 5 ° C by Kyowa Interface Science Co., Ltd.
It is measured using a CBVP-A3 type automatic surface tensiometer manufactured by Toshiba Corporation. Campus permeability of processing solution (seconds): Put the processing solution in a 100 cc beaker, adjust the temperature for 15 minutes in a constant temperature bath at 25 ° C., and gently apply 2 cm × 2 cm size 3 mm wool felt to the surface of the solution. Measure the time (seconds) before floating and settling in the liquid. An average value is calculated by performing five measurements.

Sliding friction with the through (%): A load of 500 g is set at one end of the seat belt, an intermediate portion thereof is inserted through the through, and a 10 kg load cell is set at the other end at an angle of 20 °. Strength (F1) when raising 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 defined as the sliding friction (%). The higher the value of the sliding friction,
Low friction characteristics and excellent storage properties.

Sliding friction after abrasion (%): A sheet belt was used as a friction material with sandpaper (No. 500).
The surface of the belt is abraded by applying a load of 00 g and rubbing 500 times back and forth. After the abrasion, the sliding friction with the through is measured in the same manner as described above, and is defined as the sliding friction (%) after the abrasion.

Hex bar wear retention (%): The strength of the seat belt after 5,000 times of wear is measured in accordance with the wear resistance test (JIS-4604 method), and the strength retention is calculated from the strength before wear. .

Examples 1-4 and Comparative Examples 1-5 Polyethylene terephthalate was melt spun and the spinning speed was 500 m.
And hot-rolled at 245 ° C./min, followed by hot stretching at 245 ° C. by a two-step stretching using a hot roller at 245 ° C. to a total stretching ratio of 5 times, and then winding at 3000 m / min.
A polyester filament yarn of 00 denier 144 filaments was produced.

The obtained polyester filament yarn is woven in a usual manner to produce a seat belt webbing, dyed in black by a usual method, and further treated at a concentration of 5% by weight of a treating agent having the composition shown in Table 1. And then 0.5% by weight of a treating agent effective component amount based on the total weight of the webbing fiber is applied thereto, and then the solution is heated to 110 ° C.
For 3 minutes, and then heat-treated at 150 ° C. for 3 minutes.

Each symbol of the treating agent component in Table 1 represents the compound shown below. A1 to A3 are polyether polyesters, B1 is another smoothing agent component (B), C1 to C2 are extreme pressure agent components (C),
D1 to D3 are surfactant components (C), and E1
-E2 are other additives. R1 and R2 are:
It is a resin component used in a conventional resin coat.

A1 ·· Ester of polytetramethylene glycol (1700) with adipic acid and oleic acid (molecular weight 4000) A2 ·· Ester of polytetramethylene glycol with thiodipropionic acid and isostearic acid (molecular weight 100
0) A3 ··· ester of polytetramethylene glycol, sebacic acid and isostearic acid (molecular weight 20,000) 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 ··· 10% hydrogenated castor oil (EO) adduct E1 ··· “IRGANOX” 245 (manufactured by Ciba Geigy) E2 ··· 10 mol adduct of stearylamine (EO) R1 ··· Hydroxy-containing silicon, urethane prepolymer block -Based resin R2 ··· Methylol melamine resin

[0052]

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

The results of evaluating the characteristics of the seat belt obtained by attaching the treating agent thereto are as shown in Table 2.

[0054]

[Table 2]

As is apparent from Table 2, in 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 the abrasion, the sliding property between the seat belt and the through hardly decreased, and the storage property and the durability were excellent. Furthermore, the durability due to hexagonal rod wear was excellent.

On the other hand, in the case of Comparative Examples 1 and 2 in which the average molecular weight of the polyether polyester was outside the present invention, in the case of Comparative Example 3 in which the treating agent containing no polyether polyester of the present invention was added, and In the case of Comparative Examples 4 and 5 to which the coating resin was applied, the better the slipperiness with the through, the greater the aggravation of the slippage due to abrasion, and in all cases, the slipperiness after abrasion was unsatisfactory. In addition, durability due to hexagonal bar wear was poor.

[0057]

When the agent for reducing friction of a seatbelt of the present invention is applied to a seatbelt webbing, the frictional properties of the fibers constituting the same are sufficiently reduced to increase the initial slipperiness to a sufficient level. In addition, the properties such as slipperiness can be favorably maintained even after long-term use. Therefore, it is possible to provide a seat belt having excellent storage stability and durability, and also excellent wear resistance retention.

Particularly, a polyester fiber seat belt which is effective as a low friction treating agent for polyester fiber seat belt webbing and which is excellent in slipperiness, abrasion resistance and storage property can be obtained.

Claims (5)

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