JPH0735128B2 - Automotive weather strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a so-called non-planted type automobile in which a sliding coating film is formed on a sliding contact surface of a polyvinyl chloride (PVC) base material. For weather strips.

In the present specification, the unit of measure for formulation is by weight unless otherwise stated.

<Prior Art> Fig. 1 is a cross-sectional view of a hairless weather strip. Fig. 1 is a single channel grass run, Fig. 2 is a double channel grass run, Fig. 3 is a sunroof weather strip, and Fig. 4 is a door. It is a glass weather strip outerwear. In these weather strips, a slidable coating film 5 is formed on a sliding contact surface of a base material 4 on which a sliding member such as a door glass 1 and a sunroof 3 slides. This smooth coating 5
Is formed to give good sliding properties, wear resistance, non-burring property (due to pressure bonding to glass for a long time), etc. on the surface to be contacted with the sliding surface, and its coating has wear resistance. Most of the two-component reactive urethane-based paints are excellent.

<Problems to be Solved by the Invention> However, the weather strip having the above configuration has the following problems.

(1) Since the paint is a two-liquid reaction type, a system for supplying and mixing two liquids in a fixed amount is necessary when continuously producing weather strips.

The pot life (working time) after mixing the two liquids is extremely short (within 2 hours), and the mechanism for preventing clogging of the pipe of the applicator becomes complicated.

A heating step is usually required to cure the coating film after coating.

Therefore, it is conceivable to form the above-mentioned lubricous coating film with a one-liquid solvent-volatile type paint, which is not a two-liquid reaction type, but as mentioned above, good sliding property, abrasion resistance and non-flashing property are obtained. No one has been available which can be applied and has good adhesion to a substrate and can be put to practical use.

<Means for Solving Problems> In order to solve the above-mentioned problems, the present inventors have been keenly able to form a slip coating film satisfying the above-mentioned conditions with a one-liquid solvent-volatile coating composition. As a result of efforts for development, we were able to come up with an automotive weather strip having the following configuration.

In automotive weather strips where the base material is made of PVC and a sliding coating is formed on the sliding contact surface, the sliding coating is based on straight PVC with an average degree of polymerization of 400 to 1500, nylon resin powder, fluorine A resin composition and a silicone oil are appropriately blended, and the coating composition is characterized in that the blending ratio of the silicone oil and the fluorine resin powder is the former / the latter = 0.3 to 2.5.

<Detailed Description of Configuration> The base material 4 is formed by extrusion using a conventional PVC material by a conventional method.

The coating film components of the lubricous coating film 5 formed on the sliding contact surface of the substrate 4 are composed of the following (a) straight PVC, (b) nylon resin powder, (c) fluorine resin powder and silicone oil. . The slippery coating film 5 is obtained by applying a coating composition prepared by dissolving the same composition as the coating film components in the following (d) organic solvent to the surface of the base material 4 to be contacted with the sliding material to volatilize the solvent.

(A) The straight PVC having an average degree of polymerization of 400 to 1500 (preferably 600 to 1100) is used. If it is less than 400, the abrasion resistance is poor, and if it is more than 1500, the slipperiness is poor and the solubility in the organic solvent is poor, so that the application work by spraying or the like becomes difficult. The present inventors have found that when PVC is a copolymer with vinyl acetate, the abrasion resistance is lower and the sticking property is higher than that of straight PVC.

(B) Nylon resin powder mainly acts to improve slipperiness, and is 5 to 100 phr with respect to straight PVC.
(Preferably 10 to 50 phr). If it is less than 5 phr, the compounding effect will not be obtained, and if it exceeds 100 phr, the compounding effect cannot be expected to be increased. Instead, the physical properties such as adhesion to the substrate will be adversely affected and the solution stability of the coating composition will be deteriorated. The nylon resin powder has a particle size of 5 to 70 μm. The type of nylon is not limited and may be any of nylon 6, nylon 66, nylon 12, and the like.

(C) The silicone oil and the fluorine resin powder have an effect of mainly imparting non-burring property in cooperation with each other, and are 5 to 100 phr (preferably 20 to 80 phr) for straight PVC, respectively. = 0.3 to 2.5. If both are less than 5 phr, the above-mentioned compounding effect will not be exhibited, and addition of 100 phr or more will adversely affect the physical properties of adhesion to the base material and deteriorate the solution stability of the coating composition.
Further, if the former / latter is less than 0.3, the amount of fluorine resin is large and the coating film becomes brittle, and if it exceeds 2.5, a predetermined non-sticking property cannot be imparted. The fluorine resin powder is
A particle size of 5 to 50 μm is used. Examples of the fluorine resin include tetrafluoroethylene resin, tetrafluoroethylene-hexafluoropropylene resin, trifluoroethylene chloride resin, vinylidene fluoride resin and the like. Examples of the silicone oil include dimethyl corn oil, methyl chloride silicone oil, methylhydrogen silicone oil, methylphenyl silicone oil, fluorosilicone, etc., and those having a viscosity of 100,000 to 100,000 cSt are used.

(D) The organic solvent is used to adjust the viscosity of the coating composition to an appropriate viscosity depending on the application means, and is usually straight PV.
5 to 15 times the weight of C. Organic solvents that can be used here include acetone and methyl ethyl ketone (ME
K), methyl isobutyl ketone (MIBK), cyclohexanone, benzene, toluene, xylene, methyl acetate, ethyl acetate, isopropyl acetate, trichloroethane, trichloroethylene, dichloroethylene, tetrachloroethylene, tetrahydrofuran, dimethylformamide and the like.

A paint whose viscosity has been adjusted appropriately with an organic solvent is applied to the surface of the base material 4 to be contacted with a sliding member by means of spraying, depping, rolls, brushes, etc., and then left alone at room temperature for about 10 minutes. Touch dry. The thickness of the slippery coating film 5 is 5 to 10
It is set to 0 μm. In addition, a dispersant and an inorganic filler such as carbon black may be added to the above paint, if necessary.

<Operations and Effects of the Invention> The automotive weather strip of the present invention, as described above,
The sliding coating formed on the sliding contact surface of the PVC base material is based on straight PVC, with nylon resin powder, fluororesin powder, and silicone oil mixed in, and the latter two have a specific mixing ratio. By using a film component, the following operational effects are exhibited.

(A) Since the coating film component of the present invention can be treated as a one-component solvent-volatile paint, the problem that occurred in the two-component reaction curing type like the conventional urethane type is the need for a two-component system. ， The pot life is short, and the necessity of the normal heat curing process is eliminated.

(B) The slip coating of the weather strip of the present invention can impart good slip properties, abrasion resistance and non-burring property, as shown in Examples described later, and also has good adhesion to a substrate. It can be put to practical use.

<Examples> In order to better understand the present invention, examples will be described below.

In the examples, the substrate was prepared by extruding a glass run having the cross-sectional shape shown in FIG. 1 using a pellet of the following PVC compound.

(PVC compound) Unit: Part PVC (= 2000) 100 Di-2 ethylhexyl phthalate 75 Stabilizer 3 Lubricant 2 And the coating film components shown in Table 1 are mixed with MEK / MIBK / cyclohexanone ternary organic solvent (PVC). The coating material of each Example was prepared by dissolving the same in 9 times the weight).

Then, apply 20 g of each paint to the non-sliding surface of the above glass run.
After spray coating so as to have (coating component) / m ² , the mixture was allowed to stand at room temperature for 10 minutes to form a slipping coating film, and a glass run of each example was obtained.

Then, the following physical properties were tested for each example.

(1) Spray coating property Judgment was made based on the fluidity during spray coating.

○: good, × bad

(2) Sliding property The sliding coating film surface is brought into contact with a horizontal glass surface, the weight is adjusted to 1 kg, and the tensile maximum load F is measured at 100 mm / min to measure the dynamic friction coefficient. Ask for.

(3) Stickiness Glass is pressed onto the surface of the slippery coating that has been wet with water, and the temperature is 80 ° C x 1
It was judged by measuring the tensile strength (bonding force) in the shearing direction after standing for a time.

(4) Abrasion resistance A glass run was attached to a flat-type abrasion tester, and the coating surface was abraded under the conditions (abrasion element ... 4 mm thick glass, load ... 1 kg, abrasion cycle ... 60 times / min) It was judged by the number of times of rubbing until exposure.

(5) Adhesion of coating film According to a 180 ° peel test between the coating film and the substrate (pulling speed 100 mm / min), the pulling force was measured and judged.

The test results are shown in Table 1, and it can be seen that all of the examples have physical properties that can withstand practical use and that the coating workability is also good.

[Brief description of drawings]

The example of the figure shows each example of a weather strip to which the present invention can be applied, and FIG. 1 is a sectional view of a single channel glass run,
FIG. 2 is a sectional view of a double channel glass run, FIG. 3 is a sectional view of a sunroof weather strip, and FIG. 4 is a sectional view of a door glass weather strip outer. 1 ... Glass (sliding member), 3 ... Sunroof (sliding member), 4 ... Base material, 5 ... Sliding coating layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tokio Uematsu No. 1 Nagahata, Ochiai, Kasuga-mura, Nishikasugai-gun, Aichi Prefecture (56) Reference JP 60-163977 (JP, A) JP 57-14986 (JP, B2)

Claims (1)

[Claims] 1. A weather slip in which a sliding coating layer is formed on a sliding contact surface of a polyvinyl chloride (PVC) substrate, wherein the sliding coating is straight PVC having an average degree of polymerization of 400 to 1500. ... 100 parts by weight, nylon resin powder ... 5 to 100 parts by weight, fluorine resin powder ... 5 to 100 parts by weight, silicone oil ... 5 to 100 parts by weight, compounding ratio of silicone oil and fluorine resin powder ... former /
The latter is a coating strip component having a composition of 0.3 to 2.5 (weight ratio).