JP2697985B2 - Automotive glass run - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass run for automobiles using a low- sliding paint composition , and more particularly to an improvement in operating resistance when dust adheres and an improvement in wear resistance.

[0002]

2. Description of the Related Art In recent years, glass runs for automobiles have been used in which a urethane paint is applied to a glass contact portion of a rubber weather strip. Conventional nylon pile flocks have problems in sealability, rattling, freezing in winter, wind noise and the like, but these problems have been solved by applying a urethane paint. That is, these problems are eliminated by utilizing the high strength, high wear resistance, and high elasticity of the urethane resin.

However, in a glass run for an automobile,
Since the glass can be slidably opened and closed, a material having low frictional resistance is required. Since urethane resin alone has a high coefficient of friction, the material as a sliding material is exhibited only when a material having a low coefficient of friction is mixed therein.
Conventionally, materials used for such purposes include silicone oil and a low friction coefficient polymer material such as a fluororesin, a polyamide resin, and a polyethylene resin, which have a low surface tension and are easily spread on a thin film layer to ensure surface lubrication. Was mixed in.

[0004] However, silicone oil tends to spread on the rubber lip due to its low surface tension.
It is easy to adsorb dust such as dust, and the adsorbed dust directly frictionally slides with the glass, increasing the operating resistance.In extreme cases, the operating motor is damaged and the glass opens and closes during traveling. There is a problem that causes the situation to be disabled.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to reduce the increase in sliding resistance and working resistance of glass due to the adsorption of dust with silicone oil.
Urethane resin without using silicone oil
By mixing fluorine-based oil into paint, it does not absorb dust even in a dust environment, so it does not increase operating resistance, so that problems due to increased operating resistance do not occur and the abrasion resistance of the coating film is improved. Enabled.

That is, by applying a mixture of a urethane polymer and a physically non-adsorptive, non-adhesive, non-reactive fluorine-based oil to the glass sliding surface of an automotive glass run, the operating resistance of the glass run can be reduced even in a dust environment. We did not let it go up.

[0007] The present invention, in the automotive glass run comprising a high molecular material as a base material, a urethane polymer having a molecular weight of 10,000 to 200,000 in at least its glass sliding surface (A) 100
A glass run for automobiles comprising a low-sliding coating composition comprising 2 parts by weight and 2 to 100 parts by weight of a fluorine-containing oil (B), and curing the composition. At the time of mixing the urethane polymer (A) and the fluorinated oil (B), it is not denied that other powders such as a fluororesin and a nylon resin are added to impart the required performance.

Here, in the urethane polymer (A), those having a molecular weight of 10,000 to 200,000 are used. If the molecular weight is 10,000 or less, the viscosity becomes low and the workability is good, but sufficient thin film strength cannot be obtained. In addition, when a polyvalent isocyanate is used as a curing agent, the pot life is shortened and workability is reduced. When the molecular weight exceeds 200,000, the strength of the coating film can be obtained but the viscosity becomes high, and the processability as a coating material decreases. Therefore, the molecular weight is determined in consideration of the strength, abrasion resistance and workability required for the paint, but generally 50,000 to 100,000 is suitably used.

Urethane polymers are polymer polyols obtained from diisocyanates and glycols and dicarboxylic acids. As the diisocyanate, aromatic or aliphatic diisocyanates such as TDI (tolylene diisocyanate), MDI (4,4'diphenylmethane diisocyanate) and HDI (hexamethylene diisocyanate) can be used. Glycols as chain extenders are EG (ethylene glycol), 1,4BD (butanediol), 1,6H
G (hexanediol), TMP (trimethylolpropane) and the like are used. As carboxylic acids, AA (adipic acid), MAH (maleic anhydride), PA (phthalic anhydride)
Are used. The polymer polyols formed by these include PEA (polyethylene adipate), PB
A (polybutylene adipate), PCL (polycaprolactone), PPG (polyoxypropylene diol), PT
There is MG (polytetramethylene glycol). In general, PPG and PTMG are frequently used, and there are two types of urethanes: polyester type and polyether type. Generally, the polyester type is excellent in abrasion resistance because of its strength, but is inferior in hydrolysis resistance. On the other hand, the polyether type is inferior in abrasion resistance but excellent in hydrolysis resistance. Therefore, both are selected according to the purpose of use, but generally a polyether type is used.
In this way, a urethane resin is formed by the reaction between the isocyanate and the polyether polyol, and an organic metal catalyst or the like is often used in combination.

Examples of the fluorine-based oil (B) include PFPE (perfluoropolyether) oil, CTFE (chlorotrifluoroethylene oligomer) oil and the like.
Speaking of the number of parts used, urethane polymer
(A) The ratio of the fluorinated oil (B) is 2-1 to 100 parts by weight.
It is 00 parts by weight, but preferably 5 to 50 parts by weight. If the amount of the fluorine-based oil is less than 2 parts by weight, the abrasion resistance of the product will be deteriorated, and if it exceeds 100 parts by weight, it will be difficult to disperse uniformly in the urethane resin and the adhesion to the substrate will be reduced.

[0011] Low sliding coating composition used in the present invention, in addition to the above main component, for example, tetrafluoroethylene resin, trifluorochloroethylene resin, tetrafluoroethylene - hexafluoropropylene copolymer resin , Low friction coefficient materials such as fluorinated resin powders such as vinylidene fluoride resin, polyamide resin powders, silicone resin powders, and sulfide powders such as molybdenum disulfide; fillers such as carbon black and silicon oxide; catalysts; dispersants, etc. May be added. Ma
Further, at the time of coating, a polyvalent isocyanate is mixed as a curing agent, and further, if necessary, diluted with an organic solvent to adjust the viscosity to facilitate processing. Examples of the coating method include dip coating, spray coating, roll coating, brush coating, and the like, but are not limited thereto.

[0012]

[Function] By mixing fluorine-based oil with urethane polymer, dust is not adsorbed even in a dust environment. Therefore, the operating resistance of the glass run for an automobile does not increase, and therefore the operating resistance is reduced. In addition to being less likely to cause problems due to the increase, the wear resistance of the coating film can be improved.

[0013]

EXAMPLES To 100 parts of a urethane polymer of polytetramethylene ether glycol of polyether-based polyurethane with a degree of polymerization of 100,000, 60 parts of a fluororesin powder as a low-friction coefficient material was added. ~
A blend containing a fluorine-based oil shown in 5 (perfluoropolyether in the example, product name Demnum, manufactured by Daikin Industries, Ltd.) was added, and a necessary amount of a curing agent (diisocyanate) was added immediately before application. In addition, as Comparative Examples 1 to 3, the same ones as in the above-described examples were mixed with silicon oil instead of the fluorinated oil, and similarly, a required amount of a curing agent (diisocyanate) was added immediately before application.

[0014] (*) Fluorinated oil A: Demnum 100 (Perfluoropolyether, molecular weight 5000, manufactured by Daikin Industries, Ltd.) Fluorinated oil B: Demnum 200 (8400 in molecular weight)

The obtained coating compositions of Examples and Comparative Examples were applied to the glass sliding surface of a glass run for automobiles,
After heat treatment at 10 ° C. for 10 minutes and curing, the binding force and abrasion resistance were measured. The results are shown in Tables 2 and 3.

[0016]

As can be seen from Table 2, the binding force of each of the comparative examples becomes very large immediately after dusting, whereas none of the examples takes a very large value.
This is proof that the present invention does not increase the operating resistance because it does not adsorb dust. On the other hand, conventional products containing silicone oil have increased operating resistance because they adsorb dust. In addition, when the glass is raised and lowered many times, the comparative example has the binding force further increased, but in the case of the present invention, it changes with little change from the initial value, and does not increase the operating resistance of the glass run even in a dust environment. It has become.

The binding force was measured in the same manner as in an actual vehicle by preparing a door portion on which a sash, glass run, and glass were mounted, and performing measurement and dust scattering every 5000 times of sliding. The working resistance when pulling up the glass was measured by a tensile load measuring device provided at the top of the door, and the sliding coating film was evaluated by the degree of increase in the glass binding force (working resistance) (kgf) by glass run. .

The abrasion resistance was measured by applying a load of 3 kg to a glass run using a constant load abrasion tester, sliding the glass edge portion, and recording the number of times of sliding until the coating film was worn and peeled off as a durability number ( Table 3) and abrasion resistance were evaluated.

[0020]

FIG. 1 shows the relationship between the content of the fluorine-based oil and the binding force and dust durability. It is a perfluoropolyether-based fluorine-based oil with a molecular weight of 5000 (product name Demnum 100, manufactured by Daikin Industries, Ltd.) in an amount of 0.5 to 10%. For comparison, the data in the case where silicone oil is blended are shown again. According to the measurement results shown in FIG. 1, in the case of the fluorine-based oil, the binding force before dust scattering and the binding force after dust durability test (20,000 times of ascending and descending) hardly change. On the other hand, when the silicone oil of the comparative example was blended, the binding force before dust scattering was not so different from that of the fluorine-based oil, but the binding force after the dust durability test was extremely large. FIG. 2 shows the relationship between the abrasion resistance and the fluorine oil content. Regardless of the amount of the fluorine-based oil, the results are better than those of the silicone oil.

[0022]

The glass run for automobiles using the low-sliding paint composition of the present invention has low friction resistance with glass and maintains low slidability for a long time. In addition, it does not adsorb sand, mud, dust, etc., has high durability, and does not damage glass.

[Brief description of the drawings]

FIG. 1 is a graph showing the relationship between the blending amount of a fluorine-based oil, binding force, and dust durability.

FIG. 2 is a graph showing the relationship between the amount of fluorine oil and the wear resistance.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication // C09D 175/04 C09D 175/04 C08L 75:04 (72) Inventor Tetsuo Nakanishi Hikami-gun, Hyogo Kashiwara-cho Daishin-ya 1-1 Telnic Kogyo Co., Ltd. (72) The inventor Takao Kimura 1-1 Kashiwara-cho Daishinya, Hikago-gun, Hyogo Prefecture Telnic Kogyo Co., Ltd. (56) References JP-A-2-88635 (JP) JP-A-54-112937 (JP, A) JP-A-54-112938 (JP, A) JP-A-5-117550 (JP, A) JP-A-55-73550 (JP, A) 63-182379 (JP, A) JP-A-60-92363 (JP, A)

Claims (1)

(57) [Claims] An automotive rubber comprising a polymer material as a base material.
In Laslane, at least the glass sliding surface has molecules
Amount of 10,000 to 200,000 urethane polymer (A) 100 parts by weight
Low sliding paint consisting of 2 to 100 parts by weight of fluorinated oil (B)
The composition is coated and cured.
Automotive glass run.